| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dave Jones | 15055 | 80.94% | 1 | 0.93% |
| Paul Fulghum | 1362 | 7.32% | 9 | 8.33% |
| Alan Cox | 885 | 4.76% | 13 | 12.04% |
| Dominik Brodowski | 266 | 1.43% | 16 | 14.81% |
| Al Viro | 210 | 1.13% | 9 | 8.33% |
| Alexey Khoroshilov | 164 | 0.88% | 3 | 2.78% |
| Jiri Slaby | 123 | 0.66% | 10 | 9.26% |
| Krzysztof Hałasa | 91 | 0.49% | 3 | 2.78% |
| Joe Perches | 78 | 0.42% | 3 | 2.78% |
| Peter Hurley | 72 | 0.39% | 6 | 5.56% |
| Alexey Dobriyan | 49 | 0.26% | 1 | 0.93% |
| Andrew Morton | 39 | 0.21% | 5 | 4.63% |
| Christoph Hellwig | 28 | 0.15% | 2 | 1.85% |
| Peter Hagervall | 26 | 0.14% | 1 | 0.93% |
| Alexandru Juncu | 19 | 0.10% | 1 | 0.93% |
| Maximilian Attems | 19 | 0.10% | 2 | 1.85% |
| Kees Cook | 18 | 0.10% | 1 | 0.93% |
| David Howells | 13 | 0.07% | 1 | 0.93% |
| Adrian Bunk | 13 | 0.07% | 2 | 1.85% |
| Jeff Garzik | 12 | 0.06% | 2 | 1.85% |
| Vasiliy Kulikov | 10 | 0.05% | 1 | 0.93% |
| Ingo Molnar | 8 | 0.04% | 1 | 0.93% |
| Dan Carpenter | 7 | 0.04% | 1 | 0.93% |
| Florian Westphal | 6 | 0.03% | 1 | 0.93% |
| Andres Salomon | 5 | 0.03% | 1 | 0.93% |
| Huang Shijie | 4 | 0.02% | 1 | 0.93% |
| Robert P. J. Day | 3 | 0.02% | 1 | 0.93% |
| Stephen Hemminger | 3 | 0.02% | 1 | 0.93% |
| Arnaldo Carvalho de Melo | 3 | 0.02% | 1 | 0.93% |
| Lucas De Marchi | 2 | 0.01% | 1 | 0.93% |
| Michael Hayes | 1 | 0.01% | 1 | 0.93% |
| Linus Torvalds | 1 | 0.01% | 1 | 0.93% |
| Johannes Berg | 1 | 0.01% | 1 | 0.93% |
| Tobias Klauser | 1 | 0.01% | 1 | 0.93% |
| Jeff Dike | 1 | 0.01% | 1 | 0.93% |
| Rusty Russell | 1 | 0.01% | 1 | 0.93% |
| Yoann Padioleau | 1 | 0.01% | 1 | 0.93% |
| Total | 18600 | 108 |
/* * linux/drivers/char/pcmcia/synclink_cs.c * * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $ * * Device driver for Microgate SyncLink PC Card * multiprotocol serial adapter. * * written by Paul Fulghum for Microgate Corporation * paulkf@microgate.com * * Microgate and SyncLink are trademarks of Microgate Corporation * * This code is released under the GNU General Public License (GPL) * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. */ #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq)) #if defined(__i386__) # define BREAKPOINT() asm(" int $3"); #else # define BREAKPOINT() { } #endif #define MAX_DEVICE_COUNT 4 #include <linux/module.h> #include <linux/errno.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/time.h> #include <linux/interrupt.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial.h> #include <linux/major.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/ptrace.h> #include <linux/ioport.h> #include <linux/mm.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/netdevice.h> #include <linux/vmalloc.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/ioctl.h> #include <linux/synclink.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/dma.h> #include <linux/bitops.h> #include <asm/types.h> #include <linux/termios.h> #include <linux/workqueue.h> #include <linux/hdlc.h> #include <pcmcia/cistpl.h> #include <pcmcia/cisreg.h> #include <pcmcia/ds.h> #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE)) #define SYNCLINK_GENERIC_HDLC 1 #else #define SYNCLINK_GENERIC_HDLC 0 #endif #define GET_USER(error,value,addr) error = get_user(value,addr) #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0 #define PUT_USER(error,value,addr) error = put_user(value,addr) #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0 #include <linux/uaccess.h> static MGSL_PARAMS default_params = { MGSL_MODE_HDLC, /* unsigned long mode */ 0, /* unsigned char loopback; */ HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */ HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */ 0, /* unsigned long clock_speed; */ 0xff, /* unsigned char addr_filter; */ HDLC_CRC_16_CCITT, /* unsigned short crc_type; */ HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */ HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */ 9600, /* unsigned long data_rate; */ 8, /* unsigned char data_bits; */ 1, /* unsigned char stop_bits; */ ASYNC_PARITY_NONE /* unsigned char parity; */ }; typedef struct { int count; unsigned char status; char data[1]; } RXBUF; /* The queue of BH actions to be performed */ #define BH_RECEIVE 1 #define BH_TRANSMIT 2 #define BH_STATUS 4 #define IO_PIN_SHUTDOWN_LIMIT 100 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) struct _input_signal_events { int ri_up; int ri_down; int dsr_up; int dsr_down; int dcd_up; int dcd_down; int cts_up; int cts_down; }; /* * Device instance data structure */ typedef struct _mgslpc_info { struct tty_port port; void *if_ptr; /* General purpose pointer (used by SPPP) */ int magic; int line; struct mgsl_icount icount; int timeout; int x_char; /* xon/xoff character */ unsigned char read_status_mask; unsigned char ignore_status_mask; unsigned char *tx_buf; int tx_put; int tx_get; int tx_count; /* circular list of fixed length rx buffers */ unsigned char *rx_buf; /* memory allocated for all rx buffers */ int rx_buf_total_size; /* size of memory allocated for rx buffers */ int rx_put; /* index of next empty rx buffer */ int rx_get; /* index of next full rx buffer */ int rx_buf_size; /* size in bytes of single rx buffer */ int rx_buf_count; /* total number of rx buffers */ int rx_frame_count; /* number of full rx buffers */ wait_queue_head_t status_event_wait_q; wait_queue_head_t event_wait_q; struct timer_list tx_timer; /* HDLC transmit timeout timer */ struct _mgslpc_info *next_device; /* device list link */ unsigned short imra_value; unsigned short imrb_value; unsigned char pim_value; spinlock_t lock; struct work_struct task; /* task structure for scheduling bh */ u32 max_frame_size; u32 pending_bh; bool bh_running; bool bh_requested; int dcd_chkcount; /* check counts to prevent */ int cts_chkcount; /* too many IRQs if a signal */ int dsr_chkcount; /* is floating */ int ri_chkcount; bool rx_enabled; bool rx_overflow; bool tx_enabled; bool tx_active; bool tx_aborting; u32 idle_mode; int if_mode; /* serial interface selection (RS-232, v.35 etc) */ char device_name[25]; /* device instance name */ unsigned int io_base; /* base I/O address of adapter */ unsigned int irq_level; MGSL_PARAMS params; /* communications parameters */ unsigned char serial_signals; /* current serial signal states */ bool irq_occurred; /* for diagnostics use */ char testing_irq; unsigned int init_error; /* startup error (DIAGS) */ char *flag_buf; bool drop_rts_on_tx_done; struct _input_signal_events input_signal_events; /* PCMCIA support */ struct pcmcia_device *p_dev; int stop; /* SPPP/Cisco HDLC device parts */ int netcount; spinlock_t netlock; #if SYNCLINK_GENERIC_HDLC struct net_device *netdev; #endif } MGSLPC_INFO; #define MGSLPC_MAGIC 0x5402 /* * The size of the serial xmit buffer is 1 page, or 4096 bytes */ #define TXBUFSIZE 4096 #define CHA 0x00 /* channel A offset */ #define CHB 0x40 /* channel B offset */ /* * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it. */ #undef PVR #define RXFIFO 0 #define TXFIFO 0 #define STAR 0x20 #define CMDR 0x20 #define RSTA 0x21 #define PRE 0x21 #define MODE 0x22 #define TIMR 0x23 #define XAD1 0x24 #define XAD2 0x25 #define RAH1 0x26 #define RAH2 0x27 #define DAFO 0x27 #define RAL1 0x28 #define RFC 0x28 #define RHCR 0x29 #define RAL2 0x29 #define RBCL 0x2a #define XBCL 0x2a #define RBCH 0x2b #define XBCH 0x2b #define CCR0 0x2c #define CCR1 0x2d #define CCR2 0x2e #define CCR3 0x2f #define VSTR 0x34 #define BGR 0x34 #define RLCR 0x35 #define AML 0x36 #define AMH 0x37 #define GIS 0x38 #define IVA 0x38 #define IPC 0x39 #define ISR 0x3a #define IMR 0x3a #define PVR 0x3c #define PIS 0x3d #define PIM 0x3d #define PCR 0x3e #define CCR4 0x3f // IMR/ISR #define IRQ_BREAK_ON BIT15 // rx break detected #define IRQ_DATAOVERRUN BIT14 // receive data overflow #define IRQ_ALLSENT BIT13 // all sent #define IRQ_UNDERRUN BIT12 // transmit data underrun #define IRQ_TIMER BIT11 // timer interrupt #define IRQ_CTS BIT10 // CTS status change #define IRQ_TXREPEAT BIT9 // tx message repeat #define IRQ_TXFIFO BIT8 // transmit pool ready #define IRQ_RXEOM BIT7 // receive message end #define IRQ_EXITHUNT BIT6 // receive frame start #define IRQ_RXTIME BIT6 // rx char timeout #define IRQ_DCD BIT2 // carrier detect status change #define IRQ_OVERRUN BIT1 // receive frame overflow #define IRQ_RXFIFO BIT0 // receive pool full // STAR #define XFW BIT6 // transmit FIFO write enable #define CEC BIT2 // command executing #define CTS BIT1 // CTS state #define PVR_DTR BIT0 #define PVR_DSR BIT1 #define PVR_RI BIT2 #define PVR_AUTOCTS BIT3 #define PVR_RS232 0x20 /* 0010b */ #define PVR_V35 0xe0 /* 1110b */ #define PVR_RS422 0x40 /* 0100b */ /* Register access functions */ #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg)) #define read_reg(info, reg) inb((info)->io_base + (reg)) #define read_reg16(info, reg) inw((info)->io_base + (reg)) #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg)) #define set_reg_bits(info, reg, mask) \ write_reg(info, (reg), \ (unsigned char) (read_reg(info, (reg)) | (mask))) #define clear_reg_bits(info, reg, mask) \ write_reg(info, (reg), \ (unsigned char) (read_reg(info, (reg)) & ~(mask))) /* * interrupt enable/disable routines */ static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask) { if (channel == CHA) { info->imra_value |= mask; write_reg16(info, CHA + IMR, info->imra_value); } else { info->imrb_value |= mask; write_reg16(info, CHB + IMR, info->imrb_value); } } static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask) { if (channel == CHA) { info->imra_value &= ~mask; write_reg16(info, CHA + IMR, info->imra_value); } else { info->imrb_value &= ~mask; write_reg16(info, CHB + IMR, info->imrb_value); } } #define port_irq_disable(info, mask) \ { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); } #define port_irq_enable(info, mask) \ { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); } static void rx_start(MGSLPC_INFO *info); static void rx_stop(MGSLPC_INFO *info); static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty); static void tx_stop(MGSLPC_INFO *info); static void tx_set_idle(MGSLPC_INFO *info); static void get_signals(MGSLPC_INFO *info); static void set_signals(MGSLPC_INFO *info); static void reset_device(MGSLPC_INFO *info); static void hdlc_mode(MGSLPC_INFO *info); static void async_mode(MGSLPC_INFO *info); static void tx_timeout(struct timer_list *t); static int carrier_raised(struct tty_port *port); static void dtr_rts(struct tty_port *port, int onoff); #if SYNCLINK_GENERIC_HDLC #define dev_to_port(D) (dev_to_hdlc(D)->priv) static void hdlcdev_tx_done(MGSLPC_INFO *info); static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size); static int hdlcdev_init(MGSLPC_INFO *info); static void hdlcdev_exit(MGSLPC_INFO *info); #endif static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit); static bool register_test(MGSLPC_INFO *info); static bool irq_test(MGSLPC_INFO *info); static int adapter_test(MGSLPC_INFO *info); static int claim_resources(MGSLPC_INFO *info); static void release_resources(MGSLPC_INFO *info); static int mgslpc_add_device(MGSLPC_INFO *info); static void mgslpc_remove_device(MGSLPC_INFO *info); static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty); static void rx_reset_buffers(MGSLPC_INFO *info); static int rx_alloc_buffers(MGSLPC_INFO *info); static void rx_free_buffers(MGSLPC_INFO *info); static irqreturn_t mgslpc_isr(int irq, void *dev_id); /* * Bottom half interrupt handlers */ static void bh_handler(struct work_struct *work); static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty); static void bh_status(MGSLPC_INFO *info); /* * ioctl handlers */ static int tiocmget(struct tty_struct *tty); static int tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount); static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params); static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty); static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode); static int set_txidle(MGSLPC_INFO *info, int idle_mode); static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty); static int tx_abort(MGSLPC_INFO *info); static int set_rxenable(MGSLPC_INFO *info, int enable); static int wait_events(MGSLPC_INFO *info, int __user *mask); static MGSLPC_INFO *mgslpc_device_list = NULL; static int mgslpc_device_count = 0; /* * Set this param to non-zero to load eax with the * .text section address and breakpoint on module load. * This is useful for use with gdb and add-symbol-file command. */ static bool break_on_load; /* * Driver major number, defaults to zero to get auto * assigned major number. May be forced as module parameter. */ static int ttymajor=0; static int debug_level = 0; static int maxframe[MAX_DEVICE_COUNT] = {0,}; module_param(break_on_load, bool, 0); module_param(ttymajor, int, 0); module_param(debug_level, int, 0); module_param_array(maxframe, int, NULL, 0); MODULE_LICENSE("GPL"); static char *driver_name = "SyncLink PC Card driver"; static char *driver_version = "$Revision: 4.34 $"; static struct tty_driver *serial_driver; /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty); static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout); /* PCMCIA prototypes */ static int mgslpc_config(struct pcmcia_device *link); static void mgslpc_release(u_long arg); static void mgslpc_detach(struct pcmcia_device *p_dev); /* * 1st function defined in .text section. Calling this function in * init_module() followed by a breakpoint allows a remote debugger * (gdb) to get the .text address for the add-symbol-file command. * This allows remote debugging of dynamically loadable modules. */ static void* mgslpc_get_text_ptr(void) { return mgslpc_get_text_ptr; } /** * line discipline callback wrappers * * The wrappers maintain line discipline references * while calling into the line discipline. * * ldisc_receive_buf - pass receive data to line discipline */ static void ldisc_receive_buf(struct tty_struct *tty, const __u8 *data, char *flags, int count) { struct tty_ldisc *ld; if (!tty) return; ld = tty_ldisc_ref(tty); if (ld) { if (ld->ops->receive_buf) ld->ops->receive_buf(tty, data, flags, count); tty_ldisc_deref(ld); } } static const struct tty_port_operations mgslpc_port_ops = { .carrier_raised = carrier_raised, .dtr_rts = dtr_rts }; static int mgslpc_probe(struct pcmcia_device *link) { MGSLPC_INFO *info; int ret; if (debug_level >= DEBUG_LEVEL_INFO) printk("mgslpc_attach\n"); info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL); if (!info) { printk("Error can't allocate device instance data\n"); return -ENOMEM; } info->magic = MGSLPC_MAGIC; tty_port_init(&info->port); info->port.ops = &mgslpc_port_ops; INIT_WORK(&info->task, bh_handler); info->max_frame_size = 4096; info->port.close_delay = 5*HZ/10; info->port.closing_wait = 30*HZ; init_waitqueue_head(&info->status_event_wait_q); init_waitqueue_head(&info->event_wait_q); spin_lock_init(&info->lock); spin_lock_init(&info->netlock); memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS)); info->idle_mode = HDLC_TXIDLE_FLAGS; info->imra_value = 0xffff; info->imrb_value = 0xffff; info->pim_value = 0xff; info->p_dev = link; link->priv = info; /* Initialize the struct pcmcia_device structure */ ret = mgslpc_config(link); if (ret != 0) goto failed; ret = mgslpc_add_device(info); if (ret != 0) goto failed_release; return 0; failed_release: mgslpc_release((u_long)link); failed: tty_port_destroy(&info->port); kfree(info); return ret; } /* Card has been inserted. */ static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data) { return pcmcia_request_io(p_dev); } static int mgslpc_config(struct pcmcia_device *link) { MGSLPC_INFO *info = link->priv; int ret; if (debug_level >= DEBUG_LEVEL_INFO) printk("mgslpc_config(0x%p)\n", link); link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO; ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL); if (ret != 0) goto failed; link->config_index = 8; link->config_regs = PRESENT_OPTION; ret = pcmcia_request_irq(link, mgslpc_isr); if (ret) goto failed; ret = pcmcia_enable_device(link); if (ret) goto failed; info->io_base = link->resource[0]->start; info->irq_level = link->irq; return 0; failed: mgslpc_release((u_long)link); return -ENODEV; } /* Card has been removed. * Unregister device and release PCMCIA configuration. * If device is open, postpone until it is closed. */ static void mgslpc_release(u_long arg) { struct pcmcia_device *link = (struct pcmcia_device *)arg; if (debug_level >= DEBUG_LEVEL_INFO) printk("mgslpc_release(0x%p)\n", link); pcmcia_disable_device(link); } static void mgslpc_detach(struct pcmcia_device *link) { if (debug_level >= DEBUG_LEVEL_INFO) printk("mgslpc_detach(0x%p)\n", link); ((MGSLPC_INFO *)link->priv)->stop = 1; mgslpc_release((u_long)link); mgslpc_remove_device((MGSLPC_INFO *)link->priv); } static int mgslpc_suspend(struct pcmcia_device *link) { MGSLPC_INFO *info = link->priv; info->stop = 1; return 0; } static int mgslpc_resume(struct pcmcia_device *link) { MGSLPC_INFO *info = link->priv; info->stop = 0; return 0; } static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info, char *name, const char *routine) { #ifdef MGSLPC_PARANOIA_CHECK static const char *badmagic = "Warning: bad magic number for mgsl struct (%s) in %s\n"; static const char *badinfo = "Warning: null mgslpc_info for (%s) in %s\n"; if (!info) { printk(badinfo, name, routine); return true; } if (info->magic != MGSLPC_MAGIC) { printk(badmagic, name, routine); return true; } #else if (!info) return true; #endif return false; } #define CMD_RXFIFO BIT7 // release current rx FIFO #define CMD_RXRESET BIT6 // receiver reset #define CMD_RXFIFO_READ BIT5 #define CMD_START_TIMER BIT4 #define CMD_TXFIFO BIT3 // release current tx FIFO #define CMD_TXEOM BIT1 // transmit end message #define CMD_TXRESET BIT0 // transmit reset static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel) { int i = 0; /* wait for command completion */ while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) { udelay(1); if (i++ == 1000) return false; } return true; } static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd) { wait_command_complete(info, channel); write_reg(info, (unsigned char) (channel + CMDR), cmd); } static void tx_pause(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (mgslpc_paranoia_check(info, tty->name, "tx_pause")) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("tx_pause(%s)\n", info->device_name); spin_lock_irqsave(&info->lock, flags); if (info->tx_enabled) tx_stop(info); spin_unlock_irqrestore(&info->lock, flags); } static void tx_release(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (mgslpc_paranoia_check(info, tty->name, "tx_release")) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("tx_release(%s)\n", info->device_name); spin_lock_irqsave(&info->lock, flags); if (!info->tx_enabled) tx_start(info, tty); spin_unlock_irqrestore(&info->lock, flags); } /* Return next bottom half action to perform. * or 0 if nothing to do. */ static int bh_action(MGSLPC_INFO *info) { unsigned long flags; int rc = 0; spin_lock_irqsave(&info->lock, flags); if (info->pending_bh & BH_RECEIVE) { info->pending_bh &= ~BH_RECEIVE; rc = BH_RECEIVE; } else if (info->pending_bh & BH_TRANSMIT) { info->pending_bh &= ~BH_TRANSMIT; rc = BH_TRANSMIT; } else if (info->pending_bh & BH_STATUS) { info->pending_bh &= ~BH_STATUS; rc = BH_STATUS; } if (!rc) { /* Mark BH routine as complete */ info->bh_running = false; info->bh_requested = false; } spin_unlock_irqrestore(&info->lock, flags); return rc; } static void bh_handler(struct work_struct *work) { MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task); struct tty_struct *tty; int action; if (debug_level >= DEBUG_LEVEL_BH) printk("%s(%d):bh_handler(%s) entry\n", __FILE__,__LINE__,info->device_name); info->bh_running = true; tty = tty_port_tty_get(&info->port); while((action = bh_action(info)) != 0) { /* Process work item */ if (debug_level >= DEBUG_LEVEL_BH) printk("%s(%d):bh_handler() work item action=%d\n", __FILE__,__LINE__,action); switch (action) { case BH_RECEIVE: while(rx_get_frame(info, tty)); break; case BH_TRANSMIT: bh_transmit(info, tty); break; case BH_STATUS: bh_status(info); break; default: /* unknown work item ID */ printk("Unknown work item ID=%08X!\n", action); break; } } tty_kref_put(tty); if (debug_level >= DEBUG_LEVEL_BH) printk("%s(%d):bh_handler(%s) exit\n", __FILE__,__LINE__,info->device_name); } static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty) { if (debug_level >= DEBUG_LEVEL_BH) printk("bh_transmit() entry on %s\n", info->device_name); if (tty) tty_wakeup(tty); } static void bh_status(MGSLPC_INFO *info) { info->ri_chkcount = 0; info->dsr_chkcount = 0; info->dcd_chkcount = 0; info->cts_chkcount = 0; } /* eom: non-zero = end of frame */ static void rx_ready_hdlc(MGSLPC_INFO *info, int eom) { unsigned char data[2]; unsigned char fifo_count, read_count, i; RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size)); if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom); if (!info->rx_enabled) return; if (info->rx_frame_count >= info->rx_buf_count) { /* no more free buffers */ issue_command(info, CHA, CMD_RXRESET); info->pending_bh |= BH_RECEIVE; info->rx_overflow = true; info->icount.buf_overrun++; return; } if (eom) { /* end of frame, get FIFO count from RBCL register */ fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f); if (fifo_count == 0) fifo_count = 32; } else fifo_count = 32; do { if (fifo_count == 1) { read_count = 1; data[0] = read_reg(info, CHA + RXFIFO); } else { read_count = 2; *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO); } fifo_count -= read_count; if (!fifo_count && eom) buf->status = data[--read_count]; for (i = 0; i < read_count; i++) { if (buf->count >= info->max_frame_size) { /* frame too large, reset receiver and reset current buffer */ issue_command(info, CHA, CMD_RXRESET); buf->count = 0; return; } *(buf->data + buf->count) = data[i]; buf->count++; } } while (fifo_count); if (eom) { info->pending_bh |= BH_RECEIVE; info->rx_frame_count++; info->rx_put++; if (info->rx_put >= info->rx_buf_count) info->rx_put = 0; } issue_command(info, CHA, CMD_RXFIFO); } static void rx_ready_async(MGSLPC_INFO *info, int tcd) { struct tty_port *port = &info->port; unsigned char data, status, flag; int fifo_count; int work = 0; struct mgsl_icount *icount = &info->icount; if (tcd) { /* early termination, get FIFO count from RBCL register */ fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f); /* Zero fifo count could mean 0 or 32 bytes available. * If BIT5 of STAR is set then at least 1 byte is available. */ if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5)) fifo_count = 32; } else fifo_count = 32; tty_buffer_request_room(port, fifo_count); /* Flush received async data to receive data buffer. */ while (fifo_count) { data = read_reg(info, CHA + RXFIFO); status = read_reg(info, CHA + RXFIFO); fifo_count -= 2; icount->rx++; flag = TTY_NORMAL; // if no frameing/crc error then save data // BIT7:parity error // BIT6:framing error if (status & (BIT7 + BIT6)) { if (status & BIT7) icount->parity++; else icount->frame++; /* discard char if tty control flags say so */ if (status & info->ignore_status_mask) continue; status &= info->read_status_mask; if (status & BIT7) flag = TTY_PARITY; else if (status & BIT6) flag = TTY_FRAME; } work += tty_insert_flip_char(port, data, flag); } issue_command(info, CHA, CMD_RXFIFO); if (debug_level >= DEBUG_LEVEL_ISR) { printk("%s(%d):rx_ready_async", __FILE__,__LINE__); printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n", __FILE__,__LINE__,icount->rx,icount->brk, icount->parity,icount->frame,icount->overrun); } if (work) tty_flip_buffer_push(port); } static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty) { if (!info->tx_active) return; info->tx_active = false; info->tx_aborting = false; if (info->params.mode == MGSL_MODE_ASYNC) return; info->tx_count = info->tx_put = info->tx_get = 0; del_timer(&info->tx_timer); if (info->drop_rts_on_tx_done) { get_signals(info); if (info->serial_signals & SerialSignal_RTS) { info->serial_signals &= ~SerialSignal_RTS; set_signals(info); } info->drop_rts_on_tx_done = false; } #if SYNCLINK_GENERIC_HDLC if (info->netcount) hdlcdev_tx_done(info); else #endif { if (tty && (tty->stopped || tty->hw_stopped)) { tx_stop(info); return; } info->pending_bh |= BH_TRANSMIT; } } static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty) { unsigned char fifo_count = 32; int c; if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name); if (info->params.mode == MGSL_MODE_HDLC) { if (!info->tx_active) return; } else { if (tty && (tty->stopped || tty->hw_stopped)) { tx_stop(info); return; } if (!info->tx_count) info->tx_active = false; } if (!info->tx_count) return; while (info->tx_count && fifo_count) { c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get))); if (c == 1) { write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get)); } else { write_reg16(info, CHA + TXFIFO, *((unsigned short*)(info->tx_buf + info->tx_get))); } info->tx_count -= c; info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1); fifo_count -= c; } if (info->params.mode == MGSL_MODE_ASYNC) { if (info->tx_count < WAKEUP_CHARS) info->pending_bh |= BH_TRANSMIT; issue_command(info, CHA, CMD_TXFIFO); } else { if (info->tx_count) issue_command(info, CHA, CMD_TXFIFO); else issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM); } } static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty) { get_signals(info); if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) irq_disable(info, CHB, IRQ_CTS); info->icount.cts++; if (info->serial_signals & SerialSignal_CTS) info->input_signal_events.cts_up++; else info->input_signal_events.cts_down++; wake_up_interruptible(&info->status_event_wait_q); wake_up_interruptible(&info->event_wait_q); if (tty && tty_port_cts_enabled(&info->port)) { if (tty->hw_stopped) { if (info->serial_signals & SerialSignal_CTS) { if (debug_level >= DEBUG_LEVEL_ISR) printk("CTS tx start..."); tty->hw_stopped = 0; tx_start(info, tty); info->pending_bh |= BH_TRANSMIT; return; } } else { if (!(info->serial_signals & SerialSignal_CTS)) { if (debug_level >= DEBUG_LEVEL_ISR) printk("CTS tx stop..."); tty->hw_stopped = 1; tx_stop(info); } } } info->pending_bh |= BH_STATUS; } static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty) { get_signals(info); if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) irq_disable(info, CHB, IRQ_DCD); info->icount.dcd++; if (info->serial_signals & SerialSignal_DCD) { info->input_signal_events.dcd_up++; } else info->input_signal_events.dcd_down++; #if SYNCLINK_GENERIC_HDLC if (info->netcount) { if (info->serial_signals & SerialSignal_DCD) netif_carrier_on(info->netdev); else netif_carrier_off(info->netdev); } #endif wake_up_interruptible(&info->status_event_wait_q); wake_up_interruptible(&info->event_wait_q); if (tty_port_check_carrier(&info->port)) { if (debug_level >= DEBUG_LEVEL_ISR) printk("%s CD now %s...", info->device_name, (info->serial_signals & SerialSignal_DCD) ? "on" : "off"); if (info->serial_signals & SerialSignal_DCD) wake_up_interruptible(&info->port.open_wait); else { if (debug_level >= DEBUG_LEVEL_ISR) printk("doing serial hangup..."); if (tty) tty_hangup(tty); } } info->pending_bh |= BH_STATUS; } static void dsr_change(MGSLPC_INFO *info) { get_signals(info); if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) port_irq_disable(info, PVR_DSR); info->icount.dsr++; if (info->serial_signals & SerialSignal_DSR) info->input_signal_events.dsr_up++; else info->input_signal_events.dsr_down++; wake_up_interruptible(&info->status_event_wait_q); wake_up_interruptible(&info->event_wait_q); info->pending_bh |= BH_STATUS; } static void ri_change(MGSLPC_INFO *info) { get_signals(info); if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) port_irq_disable(info, PVR_RI); info->icount.rng++; if (info->serial_signals & SerialSignal_RI) info->input_signal_events.ri_up++; else info->input_signal_events.ri_down++; wake_up_interruptible(&info->status_event_wait_q); wake_up_interruptible(&info->event_wait_q); info->pending_bh |= BH_STATUS; } /* Interrupt service routine entry point. * * Arguments: * * irq interrupt number that caused interrupt * dev_id device ID supplied during interrupt registration */ static irqreturn_t mgslpc_isr(int dummy, void *dev_id) { MGSLPC_INFO *info = dev_id; struct tty_struct *tty; unsigned short isr; unsigned char gis, pis; int count=0; if (debug_level >= DEBUG_LEVEL_ISR) printk("mgslpc_isr(%d) entry.\n", info->irq_level); if (!(info->p_dev->_locked)) return IRQ_HANDLED; tty = tty_port_tty_get(&info->port); spin_lock(&info->lock); while ((gis = read_reg(info, CHA + GIS))) { if (debug_level >= DEBUG_LEVEL_ISR) printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis); if ((gis & 0x70) || count > 1000) { printk("synclink_cs:hardware failed or ejected\n"); break; } count++; if (gis & (BIT1 | BIT0)) { isr = read_reg16(info, CHB + ISR); if (isr & IRQ_DCD) dcd_change(info, tty); if (isr & IRQ_CTS) cts_change(info, tty); } if (gis & (BIT3 | BIT2)) { isr = read_reg16(info, CHA + ISR); if (isr & IRQ_TIMER) { info->irq_occurred = true; irq_disable(info, CHA, IRQ_TIMER); } /* receive IRQs */ if (isr & IRQ_EXITHUNT) { info->icount.exithunt++; wake_up_interruptible(&info->event_wait_q); } if (isr & IRQ_BREAK_ON) { info->icount.brk++; if (info->port.flags & ASYNC_SAK) do_SAK(tty); } if (isr & IRQ_RXTIME) { issue_command(info, CHA, CMD_RXFIFO_READ); } if (isr & (IRQ_RXEOM | IRQ_RXFIFO)) { if (info->params.mode == MGSL_MODE_HDLC) rx_ready_hdlc(info, isr & IRQ_RXEOM); else rx_ready_async(info, isr & IRQ_RXEOM); } /* transmit IRQs */ if (isr & IRQ_UNDERRUN) { if (info->tx_aborting) info->icount.txabort++; else info->icount.txunder++; tx_done(info, tty); } else if (isr & IRQ_ALLSENT) { info->icount.txok++; tx_done(info, tty); } else if (isr & IRQ_TXFIFO) tx_ready(info, tty); } if (gis & BIT7) { pis = read_reg(info, CHA + PIS); if (pis & BIT1) dsr_change(info); if (pis & BIT2) ri_change(info); } } /* Request bottom half processing if there's something * for it to do and the bh is not already running */ if (info->pending_bh && !info->bh_running && !info->bh_requested) { if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):%s queueing bh task.\n", __FILE__,__LINE__,info->device_name); schedule_work(&info->task); info->bh_requested = true; } spin_unlock(&info->lock); tty_kref_put(tty); if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):mgslpc_isr(%d)exit.\n", __FILE__, __LINE__, info->irq_level); return IRQ_HANDLED; } /* Initialize and start device. */ static int startup(MGSLPC_INFO * info, struct tty_struct *tty) { int retval = 0; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name); if (tty_port_initialized(&info->port)) return 0; if (!info->tx_buf) { /* allocate a page of memory for a transmit buffer */ info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); if (!info->tx_buf) { printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n", __FILE__, __LINE__, info->device_name); return -ENOMEM; } } info->pending_bh = 0; memset(&info->icount, 0, sizeof(info->icount)); timer_setup(&info->tx_timer, tx_timeout, 0); /* Allocate and claim adapter resources */ retval = claim_resources(info); /* perform existence check and diagnostics */ if (!retval) retval = adapter_test(info); if (retval) { if (capable(CAP_SYS_ADMIN) && tty) set_bit(TTY_IO_ERROR, &tty->flags); release_resources(info); return retval; } /* program hardware for current parameters */ mgslpc_change_params(info, tty); if (tty) clear_bit(TTY_IO_ERROR, &tty->flags); tty_port_set_initialized(&info->port, 1); return 0; } /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware */ static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty) { unsigned long flags; if (!tty_port_initialized(&info->port)) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_shutdown(%s)\n", __FILE__, __LINE__, info->device_name); /* clear status wait queue because status changes */ /* can't happen after shutting down the hardware */ wake_up_interruptible(&info->status_event_wait_q); wake_up_interruptible(&info->event_wait_q); del_timer_sync(&info->tx_timer); if (info->tx_buf) { free_page((unsigned long) info->tx_buf); info->tx_buf = NULL; } spin_lock_irqsave(&info->lock, flags); rx_stop(info); tx_stop(info); /* TODO:disable interrupts instead of reset to preserve signal states */ reset_device(info); if (!tty || C_HUPCL(tty)) { info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); } spin_unlock_irqrestore(&info->lock, flags); release_resources(info); if (tty) set_bit(TTY_IO_ERROR, &tty->flags); tty_port_set_initialized(&info->port, 0); } static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty) { unsigned long flags; spin_lock_irqsave(&info->lock, flags); rx_stop(info); tx_stop(info); info->tx_count = info->tx_put = info->tx_get = 0; if (info->params.mode == MGSL_MODE_HDLC || info->netcount) hdlc_mode(info); else async_mode(info); set_signals(info); info->dcd_chkcount = 0; info->cts_chkcount = 0; info->ri_chkcount = 0; info->dsr_chkcount = 0; irq_enable(info, CHB, IRQ_DCD | IRQ_CTS); port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI); get_signals(info); if (info->netcount || (tty && C_CREAD(tty))) rx_start(info); spin_unlock_irqrestore(&info->lock, flags); } /* Reconfigure adapter based on new parameters */ static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty) { unsigned cflag; int bits_per_char; if (!tty) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_change_params(%s)\n", __FILE__, __LINE__, info->device_name); cflag = tty->termios.c_cflag; /* if B0 rate (hangup) specified then negate RTS and DTR */ /* otherwise assert RTS and DTR */ if (cflag & CBAUD) info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); /* byte size and parity */ switch (cflag & CSIZE) { case CS5: info->params.data_bits = 5; break; case CS6: info->params.data_bits = 6; break; case CS7: info->params.data_bits = 7; break; case CS8: info->params.data_bits = 8; break; default: info->params.data_bits = 7; break; } if (cflag & CSTOPB) info->params.stop_bits = 2; else info->params.stop_bits = 1; info->params.parity = ASYNC_PARITY_NONE; if (cflag & PARENB) { if (cflag & PARODD) info->params.parity = ASYNC_PARITY_ODD; else info->params.parity = ASYNC_PARITY_EVEN; #ifdef CMSPAR if (cflag & CMSPAR) info->params.parity = ASYNC_PARITY_SPACE; #endif } /* calculate number of jiffies to transmit a full * FIFO (32 bytes) at specified data rate */ bits_per_char = info->params.data_bits + info->params.stop_bits + 1; /* if port data rate is set to 460800 or less then * allow tty settings to override, otherwise keep the * current data rate. */ if (info->params.data_rate <= 460800) { info->params.data_rate = tty_get_baud_rate(tty); } if (info->params.data_rate) { info->timeout = (32*HZ*bits_per_char) / info->params.data_rate; } info->timeout += HZ/50; /* Add .02 seconds of slop */ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS); tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL); /* process tty input control flags */ info->read_status_mask = 0; if (I_INPCK(tty)) info->read_status_mask |= BIT7 | BIT6; if (I_IGNPAR(tty)) info->ignore_status_mask |= BIT7 | BIT6; mgslpc_program_hw(info, tty); } /* Add a character to the transmit buffer */ static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) { printk("%s(%d):mgslpc_put_char(%d) on %s\n", __FILE__, __LINE__, ch, info->device_name); } if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char")) return 0; if (!info->tx_buf) return 0; spin_lock_irqsave(&info->lock, flags); if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) { if (info->tx_count < TXBUFSIZE - 1) { info->tx_buf[info->tx_put++] = ch; info->tx_put &= TXBUFSIZE-1; info->tx_count++; } } spin_unlock_irqrestore(&info->lock, flags); return 1; } /* Enable transmitter so remaining characters in the * transmit buffer are sent. */ static void mgslpc_flush_chars(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n", __FILE__, __LINE__, info->device_name, info->tx_count); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars")) return; if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped || !info->tx_buf) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n", __FILE__, __LINE__, info->device_name); spin_lock_irqsave(&info->lock, flags); if (!info->tx_active) tx_start(info, tty); spin_unlock_irqrestore(&info->lock, flags); } /* Send a block of data * * Arguments: * * tty pointer to tty information structure * buf pointer to buffer containing send data * count size of send data in bytes * * Returns: number of characters written */ static int mgslpc_write(struct tty_struct * tty, const unsigned char *buf, int count) { int c, ret = 0; MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_write(%s) count=%d\n", __FILE__, __LINE__, info->device_name, count); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") || !info->tx_buf) goto cleanup; if (info->params.mode == MGSL_MODE_HDLC) { if (count > TXBUFSIZE) { ret = -EIO; goto cleanup; } if (info->tx_active) goto cleanup; else if (info->tx_count) goto start; } for (;;) { c = min(count, min(TXBUFSIZE - info->tx_count - 1, TXBUFSIZE - info->tx_put)); if (c <= 0) break; memcpy(info->tx_buf + info->tx_put, buf, c); spin_lock_irqsave(&info->lock, flags); info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1); info->tx_count += c; spin_unlock_irqrestore(&info->lock, flags); buf += c; count -= c; ret += c; } start: if (info->tx_count && !tty->stopped && !tty->hw_stopped) { spin_lock_irqsave(&info->lock, flags); if (!info->tx_active) tx_start(info, tty); spin_unlock_irqrestore(&info->lock, flags); } cleanup: if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_write(%s) returning=%d\n", __FILE__, __LINE__, info->device_name, ret); return ret; } /* Return the count of free bytes in transmit buffer */ static int mgslpc_write_room(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; int ret; if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room")) return 0; if (info->params.mode == MGSL_MODE_HDLC) { /* HDLC (frame oriented) mode */ if (info->tx_active) return 0; else return HDLC_MAX_FRAME_SIZE; } else { ret = TXBUFSIZE - info->tx_count - 1; if (ret < 0) ret = 0; } if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_write_room(%s)=%d\n", __FILE__, __LINE__, info->device_name, ret); return ret; } /* Return the count of bytes in transmit buffer */ static int mgslpc_chars_in_buffer(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; int rc; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_chars_in_buffer(%s)\n", __FILE__, __LINE__, info->device_name); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer")) return 0; if (info->params.mode == MGSL_MODE_HDLC) rc = info->tx_active ? info->max_frame_size : 0; else rc = info->tx_count; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n", __FILE__, __LINE__, info->device_name, rc); return rc; } /* Discard all data in the send buffer */ static void mgslpc_flush_buffer(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_flush_buffer(%s) entry\n", __FILE__, __LINE__, info->device_name); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer")) return; spin_lock_irqsave(&info->lock, flags); info->tx_count = info->tx_put = info->tx_get = 0; del_timer(&info->tx_timer); spin_unlock_irqrestore(&info->lock, flags); wake_up_interruptible(&tty->write_wait); tty_wakeup(tty); } /* Send a high-priority XON/XOFF character */ static void mgslpc_send_xchar(struct tty_struct *tty, char ch) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_send_xchar(%s,%d)\n", __FILE__, __LINE__, info->device_name, ch); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar")) return; info->x_char = ch; if (ch) { spin_lock_irqsave(&info->lock, flags); if (!info->tx_enabled) tx_start(info, tty); spin_unlock_irqrestore(&info->lock, flags); } } /* Signal remote device to throttle send data (our receive data) */ static void mgslpc_throttle(struct tty_struct * tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_throttle(%s) entry\n", __FILE__, __LINE__, info->device_name); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle")) return; if (I_IXOFF(tty)) mgslpc_send_xchar(tty, STOP_CHAR(tty)); if (C_CRTSCTS(tty)) { spin_lock_irqsave(&info->lock, flags); info->serial_signals &= ~SerialSignal_RTS; set_signals(info); spin_unlock_irqrestore(&info->lock, flags); } } /* Signal remote device to stop throttling send data (our receive data) */ static void mgslpc_unthrottle(struct tty_struct * tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_unthrottle(%s) entry\n", __FILE__, __LINE__, info->device_name); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else mgslpc_send_xchar(tty, START_CHAR(tty)); } if (C_CRTSCTS(tty)) { spin_lock_irqsave(&info->lock, flags); info->serial_signals |= SerialSignal_RTS; set_signals(info); spin_unlock_irqrestore(&info->lock, flags); } } /* get the current serial statistics */ static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount) { int err; if (debug_level >= DEBUG_LEVEL_INFO) printk("get_params(%s)\n", info->device_name); if (!user_icount) { memset(&info->icount, 0, sizeof(info->icount)); } else { COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount)); if (err) return -EFAULT; } return 0; } /* get the current serial parameters */ static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params) { int err; if (debug_level >= DEBUG_LEVEL_INFO) printk("get_params(%s)\n", info->device_name); COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS)); if (err) return -EFAULT; return 0; } /* set the serial parameters * * Arguments: * * info pointer to device instance data * new_params user buffer containing new serial params * * Returns: 0 if success, otherwise error code */ static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty) { unsigned long flags; MGSL_PARAMS tmp_params; int err; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):set_params %s\n", __FILE__,__LINE__, info->device_name); COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS)); if (err) { if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):set_params(%s) user buffer copy failed\n", __FILE__, __LINE__, info->device_name); return -EFAULT; } spin_lock_irqsave(&info->lock, flags); memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS)); spin_unlock_irqrestore(&info->lock, flags); mgslpc_change_params(info, tty); return 0; } static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode) { int err; if (debug_level >= DEBUG_LEVEL_INFO) printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode); COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int)); if (err) return -EFAULT; return 0; } static int set_txidle(MGSLPC_INFO * info, int idle_mode) { unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("set_txidle(%s,%d)\n", info->device_name, idle_mode); spin_lock_irqsave(&info->lock, flags); info->idle_mode = idle_mode; tx_set_idle(info); spin_unlock_irqrestore(&info->lock, flags); return 0; } static int get_interface(MGSLPC_INFO * info, int __user *if_mode) { int err; if (debug_level >= DEBUG_LEVEL_INFO) printk("get_interface(%s)=%d\n", info->device_name, info->if_mode); COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int)); if (err) return -EFAULT; return 0; } static int set_interface(MGSLPC_INFO * info, int if_mode) { unsigned long flags; unsigned char val; if (debug_level >= DEBUG_LEVEL_INFO) printk("set_interface(%s,%d)\n", info->device_name, if_mode); spin_lock_irqsave(&info->lock, flags); info->if_mode = if_mode; val = read_reg(info, PVR) & 0x0f; switch (info->if_mode) { case MGSL_INTERFACE_RS232: val |= PVR_RS232; break; case MGSL_INTERFACE_V35: val |= PVR_V35; break; case MGSL_INTERFACE_RS422: val |= PVR_RS422; break; } write_reg(info, PVR, val); spin_unlock_irqrestore(&info->lock, flags); return 0; } static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty) { unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("set_txenable(%s,%d)\n", info->device_name, enable); spin_lock_irqsave(&info->lock, flags); if (enable) { if (!info->tx_enabled) tx_start(info, tty); } else { if (info->tx_enabled) tx_stop(info); } spin_unlock_irqrestore(&info->lock, flags); return 0; } static int tx_abort(MGSLPC_INFO * info) { unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("tx_abort(%s)\n", info->device_name); spin_lock_irqsave(&info->lock, flags); if (info->tx_active && info->tx_count && info->params.mode == MGSL_MODE_HDLC) { /* clear data count so FIFO is not filled on next IRQ. * This results in underrun and abort transmission. */ info->tx_count = info->tx_put = info->tx_get = 0; info->tx_aborting = true; } spin_unlock_irqrestore(&info->lock, flags); return 0; } static int set_rxenable(MGSLPC_INFO * info, int enable) { unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("set_rxenable(%s,%d)\n", info->device_name, enable); spin_lock_irqsave(&info->lock, flags); if (enable) { if (!info->rx_enabled) rx_start(info); } else { if (info->rx_enabled) rx_stop(info); } spin_unlock_irqrestore(&info->lock, flags); return 0; } /* wait for specified event to occur * * Arguments: info pointer to device instance data * mask pointer to bitmask of events to wait for * Return Value: 0 if successful and bit mask updated with * of events triggerred, * otherwise error code */ static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr) { unsigned long flags; int s; int rc=0; struct mgsl_icount cprev, cnow; int events; int mask; struct _input_signal_events oldsigs, newsigs; DECLARE_WAITQUEUE(wait, current); COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int)); if (rc) return -EFAULT; if (debug_level >= DEBUG_LEVEL_INFO) printk("wait_events(%s,%d)\n", info->device_name, mask); spin_lock_irqsave(&info->lock, flags); /* return immediately if state matches requested events */ get_signals(info); s = info->serial_signals; events = mask & ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) + ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) + ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) + ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) ); if (events) { spin_unlock_irqrestore(&info->lock, flags); goto exit; } /* save current irq counts */ cprev = info->icount; oldsigs = info->input_signal_events; if ((info->params.mode == MGSL_MODE_HDLC) && (mask & MgslEvent_ExitHuntMode)) irq_enable(info, CHA, IRQ_EXITHUNT); set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&info->event_wait_q, &wait); spin_unlock_irqrestore(&info->lock, flags); for(;;) { schedule(); if (signal_pending(current)) { rc = -ERESTARTSYS; break; } /* get current irq counts */ spin_lock_irqsave(&info->lock, flags); cnow = info->icount; newsigs = info->input_signal_events; set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(&info->lock, flags); /* if no change, wait aborted for some reason */ if (newsigs.dsr_up == oldsigs.dsr_up && newsigs.dsr_down == oldsigs.dsr_down && newsigs.dcd_up == oldsigs.dcd_up && newsigs.dcd_down == oldsigs.dcd_down && newsigs.cts_up == oldsigs.cts_up && newsigs.cts_down == oldsigs.cts_down && newsigs.ri_up == oldsigs.ri_up && newsigs.ri_down == oldsigs.ri_down && cnow.exithunt == cprev.exithunt && cnow.rxidle == cprev.rxidle) { rc = -EIO; break; } events = mask & ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) + (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) + (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) + (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) + (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) + (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) + (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) + (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) + (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) + (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) ); if (events) break; cprev = cnow; oldsigs = newsigs; } remove_wait_queue(&info->event_wait_q, &wait); set_current_state(TASK_RUNNING); if (mask & MgslEvent_ExitHuntMode) { spin_lock_irqsave(&info->lock, flags); if (!waitqueue_active(&info->event_wait_q)) irq_disable(info, CHA, IRQ_EXITHUNT); spin_unlock_irqrestore(&info->lock, flags); } exit: if (rc == 0) PUT_USER(rc, events, mask_ptr); return rc; } static int modem_input_wait(MGSLPC_INFO *info,int arg) { unsigned long flags; int rc; struct mgsl_icount cprev, cnow; DECLARE_WAITQUEUE(wait, current); /* save current irq counts */ spin_lock_irqsave(&info->lock, flags); cprev = info->icount; add_wait_queue(&info->status_event_wait_q, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(&info->lock, flags); for(;;) { schedule(); if (signal_pending(current)) { rc = -ERESTARTSYS; break; } /* get new irq counts */ spin_lock_irqsave(&info->lock, flags); cnow = info->icount; set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(&info->lock, flags); /* if no change, wait aborted for some reason */ if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { rc = -EIO; break; } /* check for change in caller specified modem input */ if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) || (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) || (arg & TIOCM_CD && cnow.dcd != cprev.dcd) || (arg & TIOCM_CTS && cnow.cts != cprev.cts)) { rc = 0; break; } cprev = cnow; } remove_wait_queue(&info->status_event_wait_q, &wait); set_current_state(TASK_RUNNING); return rc; } /* return the state of the serial control and status signals */ static int tiocmget(struct tty_struct *tty) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned int result; unsigned long flags; spin_lock_irqsave(&info->lock, flags); get_signals(info); spin_unlock_irqrestore(&info->lock, flags); result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) + ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) + ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) + ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) + ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) + ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0); if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s tiocmget() value=%08X\n", __FILE__, __LINE__, info->device_name, result); return result; } /* set modem control signals (DTR/RTS) */ static int tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s tiocmset(%x,%x)\n", __FILE__, __LINE__, info->device_name, set, clear); if (set & TIOCM_RTS) info->serial_signals |= SerialSignal_RTS; if (set & TIOCM_DTR) info->serial_signals |= SerialSignal_DTR; if (clear & TIOCM_RTS) info->serial_signals &= ~SerialSignal_RTS; if (clear & TIOCM_DTR) info->serial_signals &= ~SerialSignal_DTR; spin_lock_irqsave(&info->lock, flags); set_signals(info); spin_unlock_irqrestore(&info->lock, flags); return 0; } /* Set or clear transmit break condition * * Arguments: tty pointer to tty instance data * break_state -1=set break condition, 0=clear */ static int mgslpc_break(struct tty_struct *tty, int break_state) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_break(%s,%d)\n", __FILE__, __LINE__, info->device_name, break_state); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break")) return -EINVAL; spin_lock_irqsave(&info->lock, flags); if (break_state == -1) set_reg_bits(info, CHA+DAFO, BIT6); else clear_reg_bits(info, CHA+DAFO, BIT6); spin_unlock_irqrestore(&info->lock, flags); return 0; } static int mgslpc_get_icount(struct tty_struct *tty, struct serial_icounter_struct *icount) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; struct mgsl_icount cnow; /* kernel counter temps */ unsigned long flags; spin_lock_irqsave(&info->lock, flags); cnow = info->icount; spin_unlock_irqrestore(&info->lock, flags); icount->cts = cnow.cts; icount->dsr = cnow.dsr; icount->rng = cnow.rng; icount->dcd = cnow.dcd; icount->rx = cnow.rx; icount->tx = cnow.tx; icount->frame = cnow.frame; icount->overrun = cnow.overrun; icount->parity = cnow.parity; icount->brk = cnow.brk; icount->buf_overrun = cnow.buf_overrun; return 0; } /* Service an IOCTL request * * Arguments: * * tty pointer to tty instance data * cmd IOCTL command code * arg command argument/context * * Return Value: 0 if success, otherwise error code */ static int mgslpc_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; void __user *argp = (void __user *)arg; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__, info->device_name, cmd); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl")) return -ENODEV; if (cmd != TIOCMIWAIT) { if (tty_io_error(tty)) return -EIO; } switch (cmd) { case MGSL_IOCGPARAMS: return get_params(info, argp); case MGSL_IOCSPARAMS: return set_params(info, argp, tty); case MGSL_IOCGTXIDLE: return get_txidle(info, argp); case MGSL_IOCSTXIDLE: return set_txidle(info, (int)arg); case MGSL_IOCGIF: return get_interface(info, argp); case MGSL_IOCSIF: return set_interface(info,(int)arg); case MGSL_IOCTXENABLE: return set_txenable(info,(int)arg, tty); case MGSL_IOCRXENABLE: return set_rxenable(info,(int)arg); case MGSL_IOCTXABORT: return tx_abort(info); case MGSL_IOCGSTATS: return get_stats(info, argp); case MGSL_IOCWAITEVENT: return wait_events(info, argp); case TIOCMIWAIT: return modem_input_wait(info,(int)arg); default: return -ENOIOCTLCMD; } return 0; } /* Set new termios settings * * Arguments: * * tty pointer to tty structure * termios pointer to buffer to hold returned old termios */ static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios) { MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__, tty->driver->name); /* just return if nothing has changed */ if ((tty->termios.c_cflag == old_termios->c_cflag) && (RELEVANT_IFLAG(tty->termios.c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) return; mgslpc_change_params(info, tty); /* Handle transition to B0 status */ if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) { info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); spin_lock_irqsave(&info->lock, flags); set_signals(info); spin_unlock_irqrestore(&info->lock, flags); } /* Handle transition away from B0 status */ if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) { info->serial_signals |= SerialSignal_DTR; if (!C_CRTSCTS(tty) || !tty_throttled(tty)) info->serial_signals |= SerialSignal_RTS; spin_lock_irqsave(&info->lock, flags); set_signals(info); spin_unlock_irqrestore(&info->lock, flags); } /* Handle turning off CRTSCTS */ if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) { tty->hw_stopped = 0; tx_release(tty); } } static void mgslpc_close(struct tty_struct *tty, struct file * filp) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; struct tty_port *port = &info->port; if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close")) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_close(%s) entry, count=%d\n", __FILE__, __LINE__, info->device_name, port->count); if (tty_port_close_start(port, tty, filp) == 0) goto cleanup; if (tty_port_initialized(port)) mgslpc_wait_until_sent(tty, info->timeout); mgslpc_flush_buffer(tty); tty_ldisc_flush(tty); shutdown(info, tty); tty_port_close_end(port, tty); tty_port_tty_set(port, NULL); cleanup: if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__, tty->driver->name, port->count); } /* Wait until the transmitter is empty. */ static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; unsigned long orig_jiffies, char_time; if (!info) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n", __FILE__, __LINE__, info->device_name); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent")) return; if (!tty_port_initialized(&info->port)) goto exit; orig_jiffies = jiffies; /* Set check interval to 1/5 of estimated time to * send a character, and make it at least 1. The check * interval should also be less than the timeout. * Note: use tight timings here to satisfy the NIST-PCTS. */ if (info->params.data_rate) { char_time = info->timeout/(32 * 5); if (!char_time) char_time++; } else char_time = 1; if (timeout) char_time = min_t(unsigned long, char_time, timeout); if (info->params.mode == MGSL_MODE_HDLC) { while (info->tx_active) { msleep_interruptible(jiffies_to_msecs(char_time)); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } } else { while ((info->tx_count || info->tx_active) && info->tx_enabled) { msleep_interruptible(jiffies_to_msecs(char_time)); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } } exit: if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n", __FILE__, __LINE__, info->device_name); } /* Called by tty_hangup() when a hangup is signaled. * This is the same as closing all open files for the port. */ static void mgslpc_hangup(struct tty_struct *tty) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_hangup(%s)\n", __FILE__, __LINE__, info->device_name); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup")) return; mgslpc_flush_buffer(tty); shutdown(info, tty); tty_port_hangup(&info->port); } static int carrier_raised(struct tty_port *port) { MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port); unsigned long flags; spin_lock_irqsave(&info->lock, flags); get_signals(info); spin_unlock_irqrestore(&info->lock, flags); if (info->serial_signals & SerialSignal_DCD) return 1; return 0; } static void dtr_rts(struct tty_port *port, int onoff) { MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port); unsigned long flags; spin_lock_irqsave(&info->lock, flags); if (onoff) info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); spin_unlock_irqrestore(&info->lock, flags); } static int mgslpc_open(struct tty_struct *tty, struct file * filp) { MGSLPC_INFO *info; struct tty_port *port; int retval, line; unsigned long flags; /* verify range of specified line number */ line = tty->index; if (line >= mgslpc_device_count) { printk("%s(%d):mgslpc_open with invalid line #%d.\n", __FILE__, __LINE__, line); return -ENODEV; } /* find the info structure for the specified line */ info = mgslpc_device_list; while(info && info->line != line) info = info->next_device; if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open")) return -ENODEV; port = &info->port; tty->driver_data = info; tty_port_tty_set(port, tty); if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_open(%s), old ref count = %d\n", __FILE__, __LINE__, tty->driver->name, port->count); port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; spin_lock_irqsave(&info->netlock, flags); if (info->netcount) { retval = -EBUSY; spin_unlock_irqrestore(&info->netlock, flags); goto cleanup; } spin_lock(&port->lock); port->count++; spin_unlock(&port->lock); spin_unlock_irqrestore(&info->netlock, flags); if (port->count == 1) { /* 1st open on this device, init hardware */ retval = startup(info, tty); if (retval < 0) goto cleanup; } retval = tty_port_block_til_ready(&info->port, tty, filp); if (retval) { if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):block_til_ready(%s) returned %d\n", __FILE__, __LINE__, info->device_name, retval); goto cleanup; } if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):mgslpc_open(%s) success\n", __FILE__, __LINE__, info->device_name); retval = 0; cleanup: return retval; } /* * /proc fs routines.... */ static inline void line_info(struct seq_file *m, MGSLPC_INFO *info) { char stat_buf[30]; unsigned long flags; seq_printf(m, "%s:io:%04X irq:%d", info->device_name, info->io_base, info->irq_level); /* output current serial signal states */ spin_lock_irqsave(&info->lock, flags); get_signals(info); spin_unlock_irqrestore(&info->lock, flags); stat_buf[0] = 0; stat_buf[1] = 0; if (info->serial_signals & SerialSignal_RTS) strcat(stat_buf, "|RTS"); if (info->serial_signals & SerialSignal_CTS) strcat(stat_buf, "|CTS"); if (info->serial_signals & SerialSignal_DTR) strcat(stat_buf, "|DTR"); if (info->serial_signals & SerialSignal_DSR) strcat(stat_buf, "|DSR"); if (info->serial_signals & SerialSignal_DCD) strcat(stat_buf, "|CD"); if (info->serial_signals & SerialSignal_RI) strcat(stat_buf, "|RI"); if (info->params.mode == MGSL_MODE_HDLC) { seq_printf(m, " HDLC txok:%d rxok:%d", info->icount.txok, info->icount.rxok); if (info->icount.txunder) seq_printf(m, " txunder:%d", info->icount.txunder); if (info->icount.txabort) seq_printf(m, " txabort:%d", info->icount.txabort); if (info->icount.rxshort) seq_printf(m, " rxshort:%d", info->icount.rxshort); if (info->icount.rxlong) seq_printf(m, " rxlong:%d", info->icount.rxlong); if (info->icount.rxover) seq_printf(m, " rxover:%d", info->icount.rxover); if (info->icount.rxcrc) seq_printf(m, " rxcrc:%d", info->icount.rxcrc); } else { seq_printf(m, " ASYNC tx:%d rx:%d", info->icount.tx, info->icount.rx); if (info->icount.frame) seq_printf(m, " fe:%d", info->icount.frame); if (info->icount.parity) seq_printf(m, " pe:%d", info->icount.parity); if (info->icount.brk) seq_printf(m, " brk:%d", info->icount.brk); if (info->icount.overrun) seq_printf(m, " oe:%d", info->icount.overrun); } /* Append serial signal status to end */ seq_printf(m, " %s\n", stat_buf+1); seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", info->tx_active,info->bh_requested,info->bh_running, info->pending_bh); } /* Called to print information about devices */ static int mgslpc_proc_show(struct seq_file *m, void *v) { MGSLPC_INFO *info; seq_printf(m, "synclink driver:%s\n", driver_version); info = mgslpc_device_list; while (info) { line_info(m, info); info = info->next_device; } return 0; } static int rx_alloc_buffers(MGSLPC_INFO *info) { /* each buffer has header and data */ info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size; /* calculate total allocation size for 8 buffers */ info->rx_buf_total_size = info->rx_buf_size * 8; /* limit total allocated memory */ if (info->rx_buf_total_size > 0x10000) info->rx_buf_total_size = 0x10000; /* calculate number of buffers */ info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size; info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL); if (info->rx_buf == NULL) return -ENOMEM; /* unused flag buffer to satisfy receive_buf calling interface */ info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL); if (!info->flag_buf) { kfree(info->rx_buf); info->rx_buf = NULL; return -ENOMEM; } rx_reset_buffers(info); return 0; } static void rx_free_buffers(MGSLPC_INFO *info) { kfree(info->rx_buf); info->rx_buf = NULL; kfree(info->flag_buf); info->flag_buf = NULL; } static int claim_resources(MGSLPC_INFO *info) { if (rx_alloc_buffers(info) < 0) { printk("Can't allocate rx buffer %s\n", info->device_name); release_resources(info); return -ENODEV; } return 0; } static void release_resources(MGSLPC_INFO *info) { if (debug_level >= DEBUG_LEVEL_INFO) printk("release_resources(%s)\n", info->device_name); rx_free_buffers(info); } /* Add the specified device instance data structure to the * global linked list of devices and increment the device count. * * Arguments: info pointer to device instance data */ static int mgslpc_add_device(MGSLPC_INFO *info) { MGSLPC_INFO *current_dev = NULL; struct device *tty_dev; int ret; info->next_device = NULL; info->line = mgslpc_device_count; sprintf(info->device_name,"ttySLP%d",info->line); if (info->line < MAX_DEVICE_COUNT) { if (maxframe[info->line]) info->max_frame_size = maxframe[info->line]; } mgslpc_device_count++; if (!mgslpc_device_list) mgslpc_device_list = info; else { current_dev = mgslpc_device_list; while (current_dev->next_device) current_dev = current_dev->next_device; current_dev->next_device = info; } if (info->max_frame_size < 4096) info->max_frame_size = 4096; else if (info->max_frame_size > 65535) info->max_frame_size = 65535; printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n", info->device_name, info->io_base, info->irq_level); #if SYNCLINK_GENERIC_HDLC ret = hdlcdev_init(info); if (ret != 0) goto failed; #endif tty_dev = tty_port_register_device(&info->port, serial_driver, info->line, &info->p_dev->dev); if (IS_ERR(tty_dev)) { ret = PTR_ERR(tty_dev); #if SYNCLINK_GENERIC_HDLC hdlcdev_exit(info); #endif goto failed; } return 0; failed: if (current_dev) current_dev->next_device = NULL; else mgslpc_device_list = NULL; mgslpc_device_count--; return ret; } static void mgslpc_remove_device(MGSLPC_INFO *remove_info) { MGSLPC_INFO *info = mgslpc_device_list; MGSLPC_INFO *last = NULL; while(info) { if (info == remove_info) { if (last) last->next_device = info->next_device; else mgslpc_device_list = info->next_device; tty_unregister_device(serial_driver, info->line); #if SYNCLINK_GENERIC_HDLC hdlcdev_exit(info); #endif release_resources(info); tty_port_destroy(&info->port); kfree(info); mgslpc_device_count--; return; } last = info; info = info->next_device; } } static const struct pcmcia_device_id mgslpc_ids[] = { PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050), PCMCIA_DEVICE_NULL }; MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids); static struct pcmcia_driver mgslpc_driver = { .owner = THIS_MODULE, .name = "synclink_cs", .probe = mgslpc_probe, .remove = mgslpc_detach, .id_table = mgslpc_ids, .suspend = mgslpc_suspend, .resume = mgslpc_resume, }; static const struct tty_operations mgslpc_ops = { .open = mgslpc_open, .close = mgslpc_close, .write = mgslpc_write, .put_char = mgslpc_put_char, .flush_chars = mgslpc_flush_chars, .write_room = mgslpc_write_room, .chars_in_buffer = mgslpc_chars_in_buffer, .flush_buffer = mgslpc_flush_buffer, .ioctl = mgslpc_ioctl, .throttle = mgslpc_throttle, .unthrottle = mgslpc_unthrottle, .send_xchar = mgslpc_send_xchar, .break_ctl = mgslpc_break, .wait_until_sent = mgslpc_wait_until_sent, .set_termios = mgslpc_set_termios, .stop = tx_pause, .start = tx_release, .hangup = mgslpc_hangup, .tiocmget = tiocmget, .tiocmset = tiocmset, .get_icount = mgslpc_get_icount, .proc_show = mgslpc_proc_show, }; static int __init synclink_cs_init(void) { int rc; if (break_on_load) { mgslpc_get_text_ptr(); BREAKPOINT(); } serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT, TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV); if (IS_ERR(serial_driver)) { rc = PTR_ERR(serial_driver); goto err; } /* Initialize the tty_driver structure */ serial_driver->driver_name = "synclink_cs"; serial_driver->name = "ttySLP"; serial_driver->major = ttymajor; serial_driver->minor_start = 64; serial_driver->type = TTY_DRIVER_TYPE_SERIAL; serial_driver->subtype = SERIAL_TYPE_NORMAL; serial_driver->init_termios = tty_std_termios; serial_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; tty_set_operations(serial_driver, &mgslpc_ops); rc = tty_register_driver(serial_driver); if (rc < 0) { printk(KERN_ERR "%s(%d):Couldn't register serial driver\n", __FILE__, __LINE__); goto err_put_tty; } rc = pcmcia_register_driver(&mgslpc_driver); if (rc < 0) goto err_unreg_tty; printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version, serial_driver->major); return 0; err_unreg_tty: tty_unregister_driver(serial_driver); err_put_tty: put_tty_driver(serial_driver); err: return rc; } static void __exit synclink_cs_exit(void) { pcmcia_unregister_driver(&mgslpc_driver); tty_unregister_driver(serial_driver); put_tty_driver(serial_driver); } module_init(synclink_cs_init); module_exit(synclink_cs_exit); static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate) { unsigned int M, N; unsigned char val; /* note:standard BRG mode is broken in V3.2 chip * so enhanced mode is always used */ if (rate) { N = 3686400 / rate; if (!N) N = 1; N >>= 1; for (M = 1; N > 64 && M < 16; M++) N >>= 1; N--; /* BGR[5..0] = N * BGR[9..6] = M * BGR[7..0] contained in BGR register * BGR[9..8] contained in CCR2[7..6] * divisor = (N+1)*2^M * * Note: M *must* not be zero (causes asymetric duty cycle) */ write_reg(info, (unsigned char) (channel + BGR), (unsigned char) ((M << 6) + N)); val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f; val |= ((M << 4) & 0xc0); write_reg(info, (unsigned char) (channel + CCR2), val); } } /* Enabled the AUX clock output at the specified frequency. */ static void enable_auxclk(MGSLPC_INFO *info) { unsigned char val; /* MODE * * 07..06 MDS[1..0] 10 = transparent HDLC mode * 05 ADM Address Mode, 0 = no addr recognition * 04 TMD Timer Mode, 0 = external * 03 RAC Receiver Active, 0 = inactive * 02 RTS 0=RTS active during xmit, 1=RTS always active * 01 TRS Timer Resolution, 1=512 * 00 TLP Test Loop, 0 = no loop * * 1000 0010 */ val = 0x82; /* channel B RTS is used to enable AUXCLK driver on SP505 */ if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed) val |= BIT2; write_reg(info, CHB + MODE, val); /* CCR0 * * 07 PU Power Up, 1=active, 0=power down * 06 MCE Master Clock Enable, 1=enabled * 05 Reserved, 0 * 04..02 SC[2..0] Encoding * 01..00 SM[1..0] Serial Mode, 00=HDLC * * 11000000 */ write_reg(info, CHB + CCR0, 0xc0); /* CCR1 * * 07 SFLG Shared Flag, 0 = disable shared flags * 06 GALP Go Active On Loop, 0 = not used * 05 GLP Go On Loop, 0 = not used * 04 ODS Output Driver Select, 1=TxD is push-pull output * 03 ITF Interframe Time Fill, 0=mark, 1=flag * 02..00 CM[2..0] Clock Mode * * 0001 0111 */ write_reg(info, CHB + CCR1, 0x17); /* CCR2 (Channel B) * * 07..06 BGR[9..8] Baud rate bits 9..8 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value * 04 SSEL Clock source select, 1=submode b * 03 TOE 0=TxCLK is input, 1=TxCLK is output * 02 RWX Read/Write Exchange 0=disabled * 01 C32, CRC select, 0=CRC-16, 1=CRC-32 * 00 DIV, data inversion 0=disabled, 1=enabled * * 0011 1000 */ if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed) write_reg(info, CHB + CCR2, 0x38); else write_reg(info, CHB + CCR2, 0x30); /* CCR4 * * 07 MCK4 Master Clock Divide by 4, 1=enabled * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled * 05 TST1 Test Pin, 0=normal operation * 04 ICD Ivert Carrier Detect, 1=enabled (active low) * 03..02 Reserved, must be 0 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes * * 0101 0000 */ write_reg(info, CHB + CCR4, 0x50); /* if auxclk not enabled, set internal BRG so * CTS transitions can be detected (requires TxC) */ if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed) mgslpc_set_rate(info, CHB, info->params.clock_speed); else mgslpc_set_rate(info, CHB, 921600); } static void loopback_enable(MGSLPC_INFO *info) { unsigned char val; /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */ val = read_reg(info, CHA + CCR1) | (BIT2 | BIT1 | BIT0); write_reg(info, CHA + CCR1, val); /* CCR2:04 SSEL Clock source select, 1=submode b */ val = read_reg(info, CHA + CCR2) | (BIT4 | BIT5); write_reg(info, CHA + CCR2, val); /* set LinkSpeed if available, otherwise default to 2Mbps */ if (info->params.clock_speed) mgslpc_set_rate(info, CHA, info->params.clock_speed); else mgslpc_set_rate(info, CHA, 1843200); /* MODE:00 TLP Test Loop, 1=loopback enabled */ val = read_reg(info, CHA + MODE) | BIT0; write_reg(info, CHA + MODE, val); } static void hdlc_mode(MGSLPC_INFO *info) { unsigned char val; unsigned char clkmode, clksubmode; /* disable all interrupts */ irq_disable(info, CHA, 0xffff); irq_disable(info, CHB, 0xffff); port_irq_disable(info, 0xff); /* assume clock mode 0a, rcv=RxC xmt=TxC */ clkmode = clksubmode = 0; if (info->params.flags & HDLC_FLAG_RXC_DPLL && info->params.flags & HDLC_FLAG_TXC_DPLL) { /* clock mode 7a, rcv = DPLL, xmt = DPLL */ clkmode = 7; } else if (info->params.flags & HDLC_FLAG_RXC_BRG && info->params.flags & HDLC_FLAG_TXC_BRG) { /* clock mode 7b, rcv = BRG, xmt = BRG */ clkmode = 7; clksubmode = 1; } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) { if (info->params.flags & HDLC_FLAG_TXC_BRG) { /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */ clkmode = 6; clksubmode = 1; } else { /* clock mode 6a, rcv = DPLL, xmt = TxC */ clkmode = 6; } } else if (info->params.flags & HDLC_FLAG_TXC_BRG) { /* clock mode 0b, rcv = RxC, xmt = BRG */ clksubmode = 1; } /* MODE * * 07..06 MDS[1..0] 10 = transparent HDLC mode * 05 ADM Address Mode, 0 = no addr recognition * 04 TMD Timer Mode, 0 = external * 03 RAC Receiver Active, 0 = inactive * 02 RTS 0=RTS active during xmit, 1=RTS always active * 01 TRS Timer Resolution, 1=512 * 00 TLP Test Loop, 0 = no loop * * 1000 0010 */ val = 0x82; if (info->params.loopback) val |= BIT0; /* preserve RTS state */ if (info->serial_signals & SerialSignal_RTS) val |= BIT2; write_reg(info, CHA + MODE, val); /* CCR0 * * 07 PU Power Up, 1=active, 0=power down * 06 MCE Master Clock Enable, 1=enabled * 05 Reserved, 0 * 04..02 SC[2..0] Encoding * 01..00 SM[1..0] Serial Mode, 00=HDLC * * 11000000 */ val = 0xc0; switch (info->params.encoding) { case HDLC_ENCODING_NRZI: val |= BIT3; break; case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT4; break; // FM0 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT4 | BIT2; break; // FM1 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT4 | BIT3; break; // Manchester } write_reg(info, CHA + CCR0, val); /* CCR1 * * 07 SFLG Shared Flag, 0 = disable shared flags * 06 GALP Go Active On Loop, 0 = not used * 05 GLP Go On Loop, 0 = not used * 04 ODS Output Driver Select, 1=TxD is push-pull output * 03 ITF Interframe Time Fill, 0=mark, 1=flag * 02..00 CM[2..0] Clock Mode * * 0001 0000 */ val = 0x10 + clkmode; write_reg(info, CHA + CCR1, val); /* CCR2 * * 07..06 BGR[9..8] Baud rate bits 9..8 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value * 04 SSEL Clock source select, 1=submode b * 03 TOE 0=TxCLK is input, 0=TxCLK is input * 02 RWX Read/Write Exchange 0=disabled * 01 C32, CRC select, 0=CRC-16, 1=CRC-32 * 00 DIV, data inversion 0=disabled, 1=enabled * * 0000 0000 */ val = 0x00; if (clkmode == 2 || clkmode == 3 || clkmode == 6 || clkmode == 7 || (clkmode == 0 && clksubmode == 1)) val |= BIT5; if (clksubmode) val |= BIT4; if (info->params.crc_type == HDLC_CRC_32_CCITT) val |= BIT1; if (info->params.encoding == HDLC_ENCODING_NRZB) val |= BIT0; write_reg(info, CHA + CCR2, val); /* CCR3 * * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8 * 05 EPT Enable preamble transmission, 1=enabled * 04 RADD Receive address pushed to FIFO, 0=disabled * 03 CRL CRC Reset Level, 0=FFFF * 02 RCRC Rx CRC 0=On 1=Off * 01 TCRC Tx CRC 0=On 1=Off * 00 PSD DPLL Phase Shift Disable * * 0000 0000 */ val = 0x00; if (info->params.crc_type == HDLC_CRC_NONE) val |= BIT2 | BIT1; if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE) val |= BIT5; switch (info->params.preamble_length) { case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT6; break; case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT6; break; case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT7 | BIT6; break; } write_reg(info, CHA + CCR3, val); /* PRE - Preamble pattern */ val = 0; switch (info->params.preamble) { case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break; case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break; case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break; case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break; } write_reg(info, CHA + PRE, val); /* CCR4 * * 07 MCK4 Master Clock Divide by 4, 1=enabled * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled * 05 TST1 Test Pin, 0=normal operation * 04 ICD Ivert Carrier Detect, 1=enabled (active low) * 03..02 Reserved, must be 0 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes * * 0101 0000 */ val = 0x50; write_reg(info, CHA + CCR4, val); if (info->params.flags & HDLC_FLAG_RXC_DPLL) mgslpc_set_rate(info, CHA, info->params.clock_speed * 16); else mgslpc_set_rate(info, CHA, info->params.clock_speed); /* RLCR Receive length check register * * 7 1=enable receive length check * 6..0 Max frame length = (RL + 1) * 32 */ write_reg(info, CHA + RLCR, 0); /* XBCH Transmit Byte Count High * * 07 DMA mode, 0 = interrupt driven * 06 NRM, 0=ABM (ignored) * 05 CAS Carrier Auto Start * 04 XC Transmit Continuously (ignored) * 03..00 XBC[10..8] Transmit byte count bits 10..8 * * 0000 0000 */ val = 0x00; if (info->params.flags & HDLC_FLAG_AUTO_DCD) val |= BIT5; write_reg(info, CHA + XBCH, val); enable_auxclk(info); if (info->params.loopback || info->testing_irq) loopback_enable(info); if (info->params.flags & HDLC_FLAG_AUTO_CTS) { irq_enable(info, CHB, IRQ_CTS); /* PVR[3] 1=AUTO CTS active */ set_reg_bits(info, CHA + PVR, BIT3); } else clear_reg_bits(info, CHA + PVR, BIT3); irq_enable(info, CHA, IRQ_RXEOM | IRQ_RXFIFO | IRQ_ALLSENT | IRQ_UNDERRUN | IRQ_TXFIFO); issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET); wait_command_complete(info, CHA); read_reg16(info, CHA + ISR); /* clear pending IRQs */ /* Master clock mode enabled above to allow reset commands * to complete even if no data clocks are present. * * Disable master clock mode for normal communications because * V3.2 of the ESCC2 has a bug that prevents the transmit all sent * IRQ when in master clock mode. * * Leave master clock mode enabled for IRQ test because the * timer IRQ used by the test can only happen in master clock mode. */ if (!info->testing_irq) clear_reg_bits(info, CHA + CCR0, BIT6); tx_set_idle(info); tx_stop(info); rx_stop(info); } static void rx_stop(MGSLPC_INFO *info) { if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):rx_stop(%s)\n", __FILE__, __LINE__, info->device_name); /* MODE:03 RAC Receiver Active, 0=inactive */ clear_reg_bits(info, CHA + MODE, BIT3); info->rx_enabled = false; info->rx_overflow = false; } static void rx_start(MGSLPC_INFO *info) { if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):rx_start(%s)\n", __FILE__, __LINE__, info->device_name); rx_reset_buffers(info); info->rx_enabled = false; info->rx_overflow = false; /* MODE:03 RAC Receiver Active, 1=active */ set_reg_bits(info, CHA + MODE, BIT3); info->rx_enabled = true; } static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty) { if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):tx_start(%s)\n", __FILE__, __LINE__, info->device_name); if (info->tx_count) { /* If auto RTS enabled and RTS is inactive, then assert */ /* RTS and set a flag indicating that the driver should */ /* negate RTS when the transmission completes. */ info->drop_rts_on_tx_done = false; if (info->params.flags & HDLC_FLAG_AUTO_RTS) { get_signals(info); if (!(info->serial_signals & SerialSignal_RTS)) { info->serial_signals |= SerialSignal_RTS; set_signals(info); info->drop_rts_on_tx_done = true; } } if (info->params.mode == MGSL_MODE_ASYNC) { if (!info->tx_active) { info->tx_active = true; tx_ready(info, tty); } } else { info->tx_active = true; tx_ready(info, tty); mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000)); } } if (!info->tx_enabled) info->tx_enabled = true; } static void tx_stop(MGSLPC_INFO *info) { if (debug_level >= DEBUG_LEVEL_ISR) printk("%s(%d):tx_stop(%s)\n", __FILE__, __LINE__, info->device_name); del_timer(&info->tx_timer); info->tx_enabled = false; info->tx_active = false; } /* Reset the adapter to a known state and prepare it for further use. */ static void reset_device(MGSLPC_INFO *info) { /* power up both channels (set BIT7) */ write_reg(info, CHA + CCR0, 0x80); write_reg(info, CHB + CCR0, 0x80); write_reg(info, CHA + MODE, 0); write_reg(info, CHB + MODE, 0); /* disable all interrupts */ irq_disable(info, CHA, 0xffff); irq_disable(info, CHB, 0xffff); port_irq_disable(info, 0xff); /* PCR Port Configuration Register * * 07..04 DEC[3..0] Serial I/F select outputs * 03 output, 1=AUTO CTS control enabled * 02 RI Ring Indicator input 0=active * 01 DSR input 0=active * 00 DTR output 0=active * * 0000 0110 */ write_reg(info, PCR, 0x06); /* PVR Port Value Register * * 07..04 DEC[3..0] Serial I/F select (0000=disabled) * 03 AUTO CTS output 1=enabled * 02 RI Ring Indicator input * 01 DSR input * 00 DTR output (1=inactive) * * 0000 0001 */ // write_reg(info, PVR, PVR_DTR); /* IPC Interrupt Port Configuration * * 07 VIS 1=Masked interrupts visible * 06..05 Reserved, 0 * 04..03 SLA Slave address, 00 ignored * 02 CASM Cascading Mode, 1=daisy chain * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low * * 0000 0101 */ write_reg(info, IPC, 0x05); } static void async_mode(MGSLPC_INFO *info) { unsigned char val; /* disable all interrupts */ irq_disable(info, CHA, 0xffff); irq_disable(info, CHB, 0xffff); port_irq_disable(info, 0xff); /* MODE * * 07 Reserved, 0 * 06 FRTS RTS State, 0=active * 05 FCTS Flow Control on CTS * 04 FLON Flow Control Enable * 03 RAC Receiver Active, 0 = inactive * 02 RTS 0=Auto RTS, 1=manual RTS * 01 TRS Timer Resolution, 1=512 * 00 TLP Test Loop, 0 = no loop * * 0000 0110 */ val = 0x06; if (info->params.loopback) val |= BIT0; /* preserve RTS state */ if (!(info->serial_signals & SerialSignal_RTS)) val |= BIT6; write_reg(info, CHA + MODE, val); /* CCR0 * * 07 PU Power Up, 1=active, 0=power down * 06 MCE Master Clock Enable, 1=enabled * 05 Reserved, 0 * 04..02 SC[2..0] Encoding, 000=NRZ * 01..00 SM[1..0] Serial Mode, 11=Async * * 1000 0011 */ write_reg(info, CHA + CCR0, 0x83); /* CCR1 * * 07..05 Reserved, 0 * 04 ODS Output Driver Select, 1=TxD is push-pull output * 03 BCR Bit Clock Rate, 1=16x * 02..00 CM[2..0] Clock Mode, 111=BRG * * 0001 1111 */ write_reg(info, CHA + CCR1, 0x1f); /* CCR2 (channel A) * * 07..06 BGR[9..8] Baud rate bits 9..8 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value * 04 SSEL Clock source select, 1=submode b * 03 TOE 0=TxCLK is input, 0=TxCLK is input * 02 RWX Read/Write Exchange 0=disabled * 01 Reserved, 0 * 00 DIV, data inversion 0=disabled, 1=enabled * * 0001 0000 */ write_reg(info, CHA + CCR2, 0x10); /* CCR3 * * 07..01 Reserved, 0 * 00 PSD DPLL Phase Shift Disable * * 0000 0000 */ write_reg(info, CHA + CCR3, 0); /* CCR4 * * 07 MCK4 Master Clock Divide by 4, 1=enabled * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled * 05 TST1 Test Pin, 0=normal operation * 04 ICD Ivert Carrier Detect, 1=enabled (active low) * 03..00 Reserved, must be 0 * * 0101 0000 */ write_reg(info, CHA + CCR4, 0x50); mgslpc_set_rate(info, CHA, info->params.data_rate * 16); /* DAFO Data Format * * 07 Reserved, 0 * 06 XBRK transmit break, 0=normal operation * 05 Stop bits (0=1, 1=2) * 04..03 PAR[1..0] Parity (01=odd, 10=even) * 02 PAREN Parity Enable * 01..00 CHL[1..0] Character Length (00=8, 01=7) * */ val = 0x00; if (info->params.data_bits != 8) val |= BIT0; /* 7 bits */ if (info->params.stop_bits != 1) val |= BIT5; if (info->params.parity != ASYNC_PARITY_NONE) { val |= BIT2; /* Parity enable */ if (info->params.parity == ASYNC_PARITY_ODD) val |= BIT3; else val |= BIT4; } write_reg(info, CHA + DAFO, val); /* RFC Rx FIFO Control * * 07 Reserved, 0 * 06 DPS, 1=parity bit not stored in data byte * 05 DXS, 0=all data stored in FIFO (including XON/XOFF) * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte * 01 Reserved, 0 * 00 TCDE Terminate Char Detect Enable, 0=disabled * * 0101 1100 */ write_reg(info, CHA + RFC, 0x5c); /* RLCR Receive length check register * * Max frame length = (RL + 1) * 32 */ write_reg(info, CHA + RLCR, 0); /* XBCH Transmit Byte Count High * * 07 DMA mode, 0 = interrupt driven * 06 NRM, 0=ABM (ignored) * 05 CAS Carrier Auto Start * 04 XC Transmit Continuously (ignored) * 03..00 XBC[10..8] Transmit byte count bits 10..8 * * 0000 0000 */ val = 0x00; if (info->params.flags & HDLC_FLAG_AUTO_DCD) val |= BIT5; write_reg(info, CHA + XBCH, val); if (info->params.flags & HDLC_FLAG_AUTO_CTS) irq_enable(info, CHA, IRQ_CTS); /* MODE:03 RAC Receiver Active, 1=active */ set_reg_bits(info, CHA + MODE, BIT3); enable_auxclk(info); if (info->params.flags & HDLC_FLAG_AUTO_CTS) { irq_enable(info, CHB, IRQ_CTS); /* PVR[3] 1=AUTO CTS active */ set_reg_bits(info, CHA + PVR, BIT3); } else clear_reg_bits(info, CHA + PVR, BIT3); irq_enable(info, CHA, IRQ_RXEOM | IRQ_RXFIFO | IRQ_BREAK_ON | IRQ_RXTIME | IRQ_ALLSENT | IRQ_TXFIFO); issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET); wait_command_complete(info, CHA); read_reg16(info, CHA + ISR); /* clear pending IRQs */ } /* Set the HDLC idle mode for the transmitter. */ static void tx_set_idle(MGSLPC_INFO *info) { /* Note: ESCC2 only supports flags and one idle modes */ if (info->idle_mode == HDLC_TXIDLE_FLAGS) set_reg_bits(info, CHA + CCR1, BIT3); else clear_reg_bits(info, CHA + CCR1, BIT3); } /* get state of the V24 status (input) signals. */ static void get_signals(MGSLPC_INFO *info) { unsigned char status = 0; /* preserve RTS and DTR */ info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR; if (read_reg(info, CHB + VSTR) & BIT7) info->serial_signals |= SerialSignal_DCD; if (read_reg(info, CHB + STAR) & BIT1) info->serial_signals |= SerialSignal_CTS; status = read_reg(info, CHA + PVR); if (!(status & PVR_RI)) info->serial_signals |= SerialSignal_RI; if (!(status & PVR_DSR)) info->serial_signals |= SerialSignal_DSR; } /* Set the state of RTS and DTR based on contents of * serial_signals member of device extension. */ static void set_signals(MGSLPC_INFO *info) { unsigned char val; val = read_reg(info, CHA + MODE); if (info->params.mode == MGSL_MODE_ASYNC) { if (info->serial_signals & SerialSignal_RTS) val &= ~BIT6; else val |= BIT6; } else { if (info->serial_signals & SerialSignal_RTS) val |= BIT2; else val &= ~BIT2; } write_reg(info, CHA + MODE, val); if (info->serial_signals & SerialSignal_DTR) clear_reg_bits(info, CHA + PVR, PVR_DTR); else set_reg_bits(info, CHA + PVR, PVR_DTR); } static void rx_reset_buffers(MGSLPC_INFO *info) { RXBUF *buf; int i; info->rx_put = 0; info->rx_get = 0; info->rx_frame_count = 0; for (i=0 ; i < info->rx_buf_count ; i++) { buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size)); buf->status = buf->count = 0; } } /* Attempt to return a received HDLC frame * Only frames received without errors are returned. * * Returns true if frame returned, otherwise false */ static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty) { unsigned short status; RXBUF *buf; unsigned int framesize = 0; unsigned long flags; bool return_frame = false; if (info->rx_frame_count == 0) return false; buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size)); status = buf->status; /* 07 VFR 1=valid frame * 06 RDO 1=data overrun * 05 CRC 1=OK, 0=error * 04 RAB 1=frame aborted */ if ((status & 0xf0) != 0xA0) { if (!(status & BIT7) || (status & BIT4)) info->icount.rxabort++; else if (status & BIT6) info->icount.rxover++; else if (!(status & BIT5)) { info->icount.rxcrc++; if (info->params.crc_type & HDLC_CRC_RETURN_EX) return_frame = true; } framesize = 0; #if SYNCLINK_GENERIC_HDLC { info->netdev->stats.rx_errors++; info->netdev->stats.rx_frame_errors++; } #endif } else return_frame = true; if (return_frame) framesize = buf->count; if (debug_level >= DEBUG_LEVEL_BH) printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n", __FILE__, __LINE__, info->device_name, status, framesize); if (debug_level >= DEBUG_LEVEL_DATA) trace_block(info, buf->data, framesize, 0); if (framesize) { if ((info->params.crc_type & HDLC_CRC_RETURN_EX && framesize+1 > info->max_frame_size) || framesize > info->max_frame_size) info->icount.rxlong++; else { if (status & BIT5) info->icount.rxok++; if (info->params.crc_type & HDLC_CRC_RETURN_EX) { *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR; ++framesize; } #if SYNCLINK_GENERIC_HDLC if (info->netcount) hdlcdev_rx(info, buf->data, framesize); else #endif ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize); } } spin_lock_irqsave(&info->lock, flags); buf->status = buf->count = 0; info->rx_frame_count--; info->rx_get++; if (info->rx_get >= info->rx_buf_count) info->rx_get = 0; spin_unlock_irqrestore(&info->lock, flags); return true; } static bool register_test(MGSLPC_INFO *info) { static unsigned char patterns[] = { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f }; static unsigned int count = ARRAY_SIZE(patterns); unsigned int i; bool rc = true; unsigned long flags; spin_lock_irqsave(&info->lock, flags); reset_device(info); for (i = 0; i < count; i++) { write_reg(info, XAD1, patterns[i]); write_reg(info, XAD2, patterns[(i + 1) % count]); if ((read_reg(info, XAD1) != patterns[i]) || (read_reg(info, XAD2) != patterns[(i + 1) % count])) { rc = false; break; } } spin_unlock_irqrestore(&info->lock, flags); return rc; } static bool irq_test(MGSLPC_INFO *info) { unsigned long end_time; unsigned long flags; spin_lock_irqsave(&info->lock, flags); reset_device(info); info->testing_irq = true; hdlc_mode(info); info->irq_occurred = false; /* init hdlc mode */ irq_enable(info, CHA, IRQ_TIMER); write_reg(info, CHA + TIMR, 0); /* 512 cycles */ issue_command(info, CHA, CMD_START_TIMER); spin_unlock_irqrestore(&info->lock, flags); end_time=100; while(end_time-- && !info->irq_occurred) { msleep_interruptible(10); } info->testing_irq = false; spin_lock_irqsave(&info->lock, flags); reset_device(info); spin_unlock_irqrestore(&info->lock, flags); return info->irq_occurred; } static int adapter_test(MGSLPC_INFO *info) { if (!register_test(info)) { info->init_error = DiagStatus_AddressFailure; printk("%s(%d):Register test failure for device %s Addr=%04X\n", __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base)); return -ENODEV; } if (!irq_test(info)) { info->init_error = DiagStatus_IrqFailure; printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n", __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level)); return -ENODEV; } if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):device %s passed diagnostics\n", __FILE__, __LINE__, info->device_name); return 0; } static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit) { int i; int linecount; if (xmit) printk("%s tx data:\n", info->device_name); else printk("%s rx data:\n", info->device_name); while(count) { if (count > 16) linecount = 16; else linecount = count; for(i=0;i<linecount;i++) printk("%02X ", (unsigned char)data[i]); for(;i<17;i++) printk(" "); for(i=0;i<linecount;i++) { if (data[i]>=040 && data[i]<=0176) printk("%c", data[i]); else printk("."); } printk("\n"); data += linecount; count -= linecount; } } /* HDLC frame time out * update stats and do tx completion processing */ static void tx_timeout(struct timer_list *t) { MGSLPC_INFO *info = from_timer(info, t, tx_timer); unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):tx_timeout(%s)\n", __FILE__, __LINE__, info->device_name); if (info->tx_active && info->params.mode == MGSL_MODE_HDLC) { info->icount.txtimeout++; } spin_lock_irqsave(&info->lock, flags); info->tx_active = false; info->tx_count = info->tx_put = info->tx_get = 0; spin_unlock_irqrestore(&info->lock, flags); #if SYNCLINK_GENERIC_HDLC if (info->netcount) hdlcdev_tx_done(info); else #endif { struct tty_struct *tty = tty_port_tty_get(&info->port); bh_transmit(info, tty); tty_kref_put(tty); } } #if SYNCLINK_GENERIC_HDLC /** * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.) * set encoding and frame check sequence (FCS) options * * dev pointer to network device structure * encoding serial encoding setting * parity FCS setting * * returns 0 if success, otherwise error code */ static int hdlcdev_attach(struct net_device *dev, unsigned short encoding, unsigned short parity) { MGSLPC_INFO *info = dev_to_port(dev); struct tty_struct *tty; unsigned char new_encoding; unsigned short new_crctype; /* return error if TTY interface open */ if (info->port.count) return -EBUSY; switch (encoding) { case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break; case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break; case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break; case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break; case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break; default: return -EINVAL; } switch (parity) { case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break; case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break; case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break; default: return -EINVAL; } info->params.encoding = new_encoding; info->params.crc_type = new_crctype; /* if network interface up, reprogram hardware */ if (info->netcount) { tty = tty_port_tty_get(&info->port); mgslpc_program_hw(info, tty); tty_kref_put(tty); } return 0; } /** * called by generic HDLC layer to send frame * * skb socket buffer containing HDLC frame * dev pointer to network device structure */ static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev) { MGSLPC_INFO *info = dev_to_port(dev); unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name); /* stop sending until this frame completes */ netif_stop_queue(dev); /* copy data to device buffers */ skb_copy_from_linear_data(skb, info->tx_buf, skb->len); info->tx_get = 0; info->tx_put = info->tx_count = skb->len; /* update network statistics */ dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; /* done with socket buffer, so free it */ dev_kfree_skb(skb); /* save start time for transmit timeout detection */ netif_trans_update(dev); /* start hardware transmitter if necessary */ spin_lock_irqsave(&info->lock, flags); if (!info->tx_active) { struct tty_struct *tty = tty_port_tty_get(&info->port); tx_start(info, tty); tty_kref_put(tty); } spin_unlock_irqrestore(&info->lock, flags); return NETDEV_TX_OK; } /** * called by network layer when interface enabled * claim resources and initialize hardware * * dev pointer to network device structure * * returns 0 if success, otherwise error code */ static int hdlcdev_open(struct net_device *dev) { MGSLPC_INFO *info = dev_to_port(dev); struct tty_struct *tty; int rc; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name); /* generic HDLC layer open processing */ rc = hdlc_open(dev); if (rc != 0) return rc; /* arbitrate between network and tty opens */ spin_lock_irqsave(&info->netlock, flags); if (info->port.count != 0 || info->netcount != 0) { printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name); spin_unlock_irqrestore(&info->netlock, flags); return -EBUSY; } info->netcount=1; spin_unlock_irqrestore(&info->netlock, flags); tty = tty_port_tty_get(&info->port); /* claim resources and init adapter */ rc = startup(info, tty); if (rc != 0) { tty_kref_put(tty); spin_lock_irqsave(&info->netlock, flags); info->netcount=0; spin_unlock_irqrestore(&info->netlock, flags); return rc; } /* assert RTS and DTR, apply hardware settings */ info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; mgslpc_program_hw(info, tty); tty_kref_put(tty); /* enable network layer transmit */ netif_trans_update(dev); netif_start_queue(dev); /* inform generic HDLC layer of current DCD status */ spin_lock_irqsave(&info->lock, flags); get_signals(info); spin_unlock_irqrestore(&info->lock, flags); if (info->serial_signals & SerialSignal_DCD) netif_carrier_on(dev); else netif_carrier_off(dev); return 0; } /** * called by network layer when interface is disabled * shutdown hardware and release resources * * dev pointer to network device structure * * returns 0 if success, otherwise error code */ static int hdlcdev_close(struct net_device *dev) { MGSLPC_INFO *info = dev_to_port(dev); struct tty_struct *tty = tty_port_tty_get(&info->port); unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name); netif_stop_queue(dev); /* shutdown adapter and release resources */ shutdown(info, tty); tty_kref_put(tty); hdlc_close(dev); spin_lock_irqsave(&info->netlock, flags); info->netcount=0; spin_unlock_irqrestore(&info->netlock, flags); return 0; } /** * called by network layer to process IOCTL call to network device * * dev pointer to network device structure * ifr pointer to network interface request structure * cmd IOCTL command code * * returns 0 if success, otherwise error code */ static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { const size_t size = sizeof(sync_serial_settings); sync_serial_settings new_line; sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; MGSLPC_INFO *info = dev_to_port(dev); unsigned int flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name); /* return error if TTY interface open */ if (info->port.count) return -EBUSY; if (cmd != SIOCWANDEV) return hdlc_ioctl(dev, ifr, cmd); memset(&new_line, 0, size); switch(ifr->ifr_settings.type) { case IF_GET_IFACE: /* return current sync_serial_settings */ ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL; if (ifr->ifr_settings.size < size) { ifr->ifr_settings.size = size; /* data size wanted */ return -ENOBUFS; } flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); switch (flags){ case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break; case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break; case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break; case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break; default: new_line.clock_type = CLOCK_DEFAULT; } new_line.clock_rate = info->params.clock_speed; new_line.loopback = info->params.loopback ? 1:0; if (copy_to_user(line, &new_line, size)) return -EFAULT; return 0; case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */ if(!capable(CAP_NET_ADMIN)) return -EPERM; if (copy_from_user(&new_line, line, size)) return -EFAULT; switch (new_line.clock_type) { case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break; case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break; case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break; case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break; case CLOCK_DEFAULT: flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break; default: return -EINVAL; } if (new_line.loopback != 0 && new_line.loopback != 1) return -EINVAL; info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); info->params.flags |= flags; info->params.loopback = new_line.loopback; if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG)) info->params.clock_speed = new_line.clock_rate; else info->params.clock_speed = 0; /* if network interface up, reprogram hardware */ if (info->netcount) { struct tty_struct *tty = tty_port_tty_get(&info->port); mgslpc_program_hw(info, tty); tty_kref_put(tty); } return 0; default: return hdlc_ioctl(dev, ifr, cmd); } } /** * called by network layer when transmit timeout is detected * * dev pointer to network device structure */ static void hdlcdev_tx_timeout(struct net_device *dev) { MGSLPC_INFO *info = dev_to_port(dev); unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("hdlcdev_tx_timeout(%s)\n", dev->name); dev->stats.tx_errors++; dev->stats.tx_aborted_errors++; spin_lock_irqsave(&info->lock, flags); tx_stop(info); spin_unlock_irqrestore(&info->lock, flags); netif_wake_queue(dev); } /** * called by device driver when transmit completes * reenable network layer transmit if stopped * * info pointer to device instance information */ static void hdlcdev_tx_done(MGSLPC_INFO *info) { if (netif_queue_stopped(info->netdev)) netif_wake_queue(info->netdev); } /** * called by device driver when frame received * pass frame to network layer * * info pointer to device instance information * buf pointer to buffer contianing frame data * size count of data bytes in buf */ static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size) { struct sk_buff *skb = dev_alloc_skb(size); struct net_device *dev = info->netdev; if (debug_level >= DEBUG_LEVEL_INFO) printk("hdlcdev_rx(%s)\n", dev->name); if (skb == NULL) { printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name); dev->stats.rx_dropped++; return; } skb_put_data(skb, buf, size); skb->protocol = hdlc_type_trans(skb, dev); dev->stats.rx_packets++; dev->stats.rx_bytes += size; netif_rx(skb); } static const struct net_device_ops hdlcdev_ops = { .ndo_open = hdlcdev_open, .ndo_stop = hdlcdev_close, .ndo_start_xmit = hdlc_start_xmit, .ndo_do_ioctl = hdlcdev_ioctl, .ndo_tx_timeout = hdlcdev_tx_timeout, }; /** * called by device driver when adding device instance * do generic HDLC initialization * * info pointer to device instance information * * returns 0 if success, otherwise error code */ static int hdlcdev_init(MGSLPC_INFO *info) { int rc; struct net_device *dev; hdlc_device *hdlc; /* allocate and initialize network and HDLC layer objects */ dev = alloc_hdlcdev(info); if (dev == NULL) { printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__); return -ENOMEM; } /* for network layer reporting purposes only */ dev->base_addr = info->io_base; dev->irq = info->irq_level; /* network layer callbacks and settings */ dev->netdev_ops = &hdlcdev_ops; dev->watchdog_timeo = 10 * HZ; dev->tx_queue_len = 50; /* generic HDLC layer callbacks and settings */ hdlc = dev_to_hdlc(dev); hdlc->attach = hdlcdev_attach; hdlc->xmit = hdlcdev_xmit; /* register objects with HDLC layer */ rc = register_hdlc_device(dev); if (rc) { printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__); free_netdev(dev); return rc; } info->netdev = dev; return 0; } /** * called by device driver when removing device instance * do generic HDLC cleanup * * info pointer to device instance information */ static void hdlcdev_exit(MGSLPC_INFO *info) { unregister_hdlc_device(info->netdev); free_netdev(info->netdev); info->netdev = NULL; } #endif /* CONFIG_HDLC */
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