| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 8991 | 87.79% | 21 | 25.93% |
| Krzysztof Hałasa | 430 | 4.20% | 2 | 2.47% |
| Rusty Russell | 161 | 1.57% | 3 | 3.70% |
| Joe Perches | 115 | 1.12% | 2 | 2.47% |
| Al Viro | 115 | 1.12% | 8 | 9.88% |
| Hanna V. Linder | 103 | 1.01% | 1 | 1.23% |
| Stephen Hemminger | 80 | 0.78% | 3 | 3.70% |
| Jonathan Corbet | 33 | 0.32% | 2 | 2.47% |
| Arnd Bergmann | 26 | 0.25% | 1 | 1.23% |
| Andrew Morton | 20 | 0.20% | 2 | 2.47% |
| Fabian Frederick | 18 | 0.18% | 1 | 1.23% |
| Alan Cox | 17 | 0.17% | 1 | 1.23% |
| Matthias Kaehlcke | 15 | 0.15% | 1 | 1.23% |
| Dan Carpenter | 14 | 0.14% | 2 | 2.47% |
| Dave Jones | 13 | 0.13% | 2 | 2.47% |
| Greg Kroah-Hartman | 13 | 0.13% | 5 | 6.17% |
| Linus Torvalds | 12 | 0.12% | 4 | 4.94% |
| David Howells | 9 | 0.09% | 1 | 1.23% |
| Michael S. Tsirkin | 8 | 0.08% | 1 | 1.23% |
| Nishanth Aravamudan | 7 | 0.07% | 2 | 2.47% |
| Thomas Gleixner | 5 | 0.05% | 2 | 2.47% |
| Yoann Padioleau | 5 | 0.05% | 1 | 1.23% |
| Julia Lawall | 5 | 0.05% | 1 | 1.23% |
| Nicholas Mc Guire | 4 | 0.04% | 1 | 1.23% |
| Jan Yenya Kasprzak | 4 | 0.04% | 1 | 1.23% |
| David S. Miller | 4 | 0.04% | 1 | 1.23% |
| Florian Westphal | 3 | 0.03% | 1 | 1.23% |
| Arnaldo Carvalho de Melo | 3 | 0.03% | 1 | 1.23% |
| Alexey Dobriyan | 2 | 0.02% | 1 | 1.23% |
| Wei Yang | 1 | 0.01% | 1 | 1.23% |
| Ingo Molnar | 1 | 0.01% | 1 | 1.23% |
| Tony Jones | 1 | 0.01% | 1 | 1.23% |
| Arjan van de Ven | 1 | 0.01% | 1 | 1.23% |
| Tom Fredrik Blenning Klaussen | 1 | 0.01% | 1 | 1.23% |
| Lucas De Marchi | 1 | 0.01% | 1 | 1.23% |
| Total | 10241 | 81 |
// SPDX-License-Identifier: GPL-2.0-or-later /* $Id: cosa.c,v 1.31 2000/03/08 17:47:16 kas Exp $ */ /* * Copyright (C) 1995-1997 Jan "Yenya" Kasprzak <kas@fi.muni.cz> * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl> */ /* * The driver for the SRP and COSA synchronous serial cards. * * HARDWARE INFO * * Both cards are developed at the Institute of Computer Science, * Masaryk University (http://www.ics.muni.cz/). The hardware is * developed by Jiri Novotny <novotny@ics.muni.cz>. More information * and the photo of both cards is available at * http://www.pavoucek.cz/cosa.html. The card documentation, firmwares * and other goods can be downloaded from ftp://ftp.ics.muni.cz/pub/cosa/. * For Linux-specific utilities, see below in the "Software info" section. * If you want to order the card, contact Jiri Novotny. * * The SRP (serial port?, the Czech word "srp" means "sickle") card * is a 2-port intelligent (with its own 8-bit CPU) synchronous serial card * with V.24 interfaces up to 80kb/s each. * * The COSA (communication serial adapter?, the Czech word "kosa" means * "scythe") is a next-generation sync/async board with two interfaces * - currently any of V.24, X.21, V.35 and V.36 can be selected. * It has a 16-bit SAB80166 CPU and can do up to 10 Mb/s per channel. * The 8-channels version is in development. * * Both types have downloadable firmware and communicate via ISA DMA. * COSA can be also a bus-mastering device. * * SOFTWARE INFO * * The homepage of the Linux driver is at http://www.fi.muni.cz/~kas/cosa/. * The CVS tree of Linux driver can be viewed there, as well as the * firmware binaries and user-space utilities for downloading the firmware * into the card and setting up the card. * * The Linux driver (unlike the present *BSD drivers :-) can work even * for the COSA and SRP in one computer and allows each channel to work * in one of the two modes (character or network device). * * AUTHOR * * The Linux driver was written by Jan "Yenya" Kasprzak <kas@fi.muni.cz>. * * You can mail me bugfixes and even success reports. I am especially * interested in the SMP and/or muliti-channel success/failure reports * (I wonder if I did the locking properly :-). * * THE AUTHOR USED THE FOLLOWING SOURCES WHEN PROGRAMMING THE DRIVER * * The COSA/SRP NetBSD driver by Zdenek Salvet and Ivos Cernohlavek * The skeleton.c by Donald Becker * The SDL Riscom/N2 driver by Mike Natale * The Comtrol Hostess SV11 driver by Alan Cox * The Sync PPP/Cisco HDLC layer (syncppp.c) ported to Linux by Alan Cox */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched/signal.h> #include <linux/slab.h> #include <linux/poll.h> #include <linux/fs.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/hdlc.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/netdevice.h> #include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/device.h> #include <asm/io.h> #include <asm/dma.h> #include <asm/byteorder.h> #undef COSA_SLOW_IO /* for testing purposes only */ #include "cosa.h" /* Maximum length of the identification string. */ #define COSA_MAX_ID_STRING 128 /* Maximum length of the channel name */ #define COSA_MAX_NAME (sizeof("cosaXXXcXXX")+1) /* Per-channel data structure */ struct channel_data { int usage; /* Usage count; >0 for chrdev, -1 for netdev */ int num; /* Number of the channel */ struct cosa_data *cosa; /* Pointer to the per-card structure */ int txsize; /* Size of transmitted data */ char *txbuf; /* Transmit buffer */ char name[COSA_MAX_NAME]; /* channel name */ /* The HW layer interface */ /* routine called from the RX interrupt */ char *(*setup_rx)(struct channel_data *channel, int size); /* routine called when the RX is done (from the EOT interrupt) */ int (*rx_done)(struct channel_data *channel); /* routine called when the TX is done (from the EOT interrupt) */ int (*tx_done)(struct channel_data *channel, int size); /* Character device parts */ struct mutex rlock; struct semaphore wsem; char *rxdata; int rxsize; wait_queue_head_t txwaitq, rxwaitq; int tx_status, rx_status; /* generic HDLC device parts */ struct net_device *netdev; struct sk_buff *rx_skb, *tx_skb; }; /* cosa->firmware_status bits */ #define COSA_FW_RESET (1<<0) /* Is the ROM monitor active? */ #define COSA_FW_DOWNLOAD (1<<1) /* Is the microcode downloaded? */ #define COSA_FW_START (1<<2) /* Is the microcode running? */ struct cosa_data { int num; /* Card number */ char name[COSA_MAX_NAME]; /* Card name - e.g "cosa0" */ unsigned int datareg, statusreg; /* I/O ports */ unsigned short irq, dma; /* IRQ and DMA number */ unsigned short startaddr; /* Firmware start address */ unsigned short busmaster; /* Use busmastering? */ int nchannels; /* # of channels on this card */ int driver_status; /* For communicating with firmware */ int firmware_status; /* Downloaded, reseted, etc. */ unsigned long rxbitmap, txbitmap;/* Bitmap of channels who are willing to send/receive data */ unsigned long rxtx; /* RX or TX in progress? */ int enabled; int usage; /* usage count */ int txchan, txsize, rxsize; struct channel_data *rxchan; char *bouncebuf; char *txbuf, *rxbuf; struct channel_data *chan; spinlock_t lock; /* For exclusive operations on this structure */ char id_string[COSA_MAX_ID_STRING]; /* ROM monitor ID string */ char *type; /* card type */ }; /* * Define this if you want all the possible ports to be autoprobed. * It is here but it probably is not a good idea to use this. */ /* #define COSA_ISA_AUTOPROBE 1 */ /* * Character device major number. 117 was allocated for us. * The value of 0 means to allocate a first free one. */ static DEFINE_MUTEX(cosa_chardev_mutex); static int cosa_major = 117; /* * Encoding of the minor numbers: * The lowest CARD_MINOR_BITS bits means the channel on the single card, * the highest bits means the card number. */ #define CARD_MINOR_BITS 4 /* How many bits in minor number are reserved * for the single card */ /* * The following depends on CARD_MINOR_BITS. Unfortunately, the "MODULE_STRING" * macro doesn't like anything other than the raw number as an argument :-( */ #define MAX_CARDS 16 /* #define MAX_CARDS (1 << (8-CARD_MINOR_BITS)) */ #define DRIVER_RX_READY 0x0001 #define DRIVER_TX_READY 0x0002 #define DRIVER_TXMAP_SHIFT 2 #define DRIVER_TXMAP_MASK 0x0c /* FIXME: 0xfc for 8-channel version */ /* * for cosa->rxtx - indicates whether either transmit or receive is * in progress. These values are mean number of the bit. */ #define TXBIT 0 #define RXBIT 1 #define IRQBIT 2 #define COSA_MTU 2000 /* FIXME: I don't know this exactly */ #undef DEBUG_DATA //1 /* Dump the data read or written to the channel */ #undef DEBUG_IRQS //1 /* Print the message when the IRQ is received */ #undef DEBUG_IO //1 /* Dump the I/O traffic */ #define TX_TIMEOUT (5*HZ) /* Maybe the following should be allocated dynamically */ static struct cosa_data cosa_cards[MAX_CARDS]; static int nr_cards; #ifdef COSA_ISA_AUTOPROBE static int io[MAX_CARDS+1] = { 0x220, 0x228, 0x210, 0x218, 0, }; /* NOTE: DMA is not autoprobed!!! */ static int dma[MAX_CARDS+1] = { 1, 7, 1, 7, 1, 7, 1, 7, 0, }; #else static int io[MAX_CARDS+1]; static int dma[MAX_CARDS+1]; #endif /* IRQ can be safely autoprobed */ static int irq[MAX_CARDS+1] = { -1, -1, -1, -1, -1, -1, 0, }; /* for class stuff*/ static struct class *cosa_class; #ifdef MODULE module_param_hw_array(io, int, ioport, NULL, 0); MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards"); module_param_hw_array(irq, int, irq, NULL, 0); MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards"); module_param_hw_array(dma, int, dma, NULL, 0); MODULE_PARM_DESC(dma, "The DMA channels of the COSA or SRP cards"); MODULE_AUTHOR("Jan \"Yenya\" Kasprzak, <kas@fi.muni.cz>"); MODULE_DESCRIPTION("Modular driver for the COSA or SRP synchronous card"); MODULE_LICENSE("GPL"); #endif /* I use this mainly for testing purposes */ #ifdef COSA_SLOW_IO #define cosa_outb outb_p #define cosa_outw outw_p #define cosa_inb inb_p #define cosa_inw inw_p #else #define cosa_outb outb #define cosa_outw outw #define cosa_inb inb #define cosa_inw inw #endif #define is_8bit(cosa) (!(cosa->datareg & 0x08)) #define cosa_getstatus(cosa) (cosa_inb(cosa->statusreg)) #define cosa_putstatus(cosa, stat) (cosa_outb(stat, cosa->statusreg)) #define cosa_getdata16(cosa) (cosa_inw(cosa->datareg)) #define cosa_getdata8(cosa) (cosa_inb(cosa->datareg)) #define cosa_putdata16(cosa, dt) (cosa_outw(dt, cosa->datareg)) #define cosa_putdata8(cosa, dt) (cosa_outb(dt, cosa->datareg)) /* Initialization stuff */ static int cosa_probe(int ioaddr, int irq, int dma); /* HW interface */ static void cosa_enable_rx(struct channel_data *chan); static void cosa_disable_rx(struct channel_data *chan); static int cosa_start_tx(struct channel_data *channel, char *buf, int size); static void cosa_kick(struct cosa_data *cosa); static int cosa_dma_able(struct channel_data *chan, char *buf, int data); /* Network device stuff */ static int cosa_net_attach(struct net_device *dev, unsigned short encoding, unsigned short parity); static int cosa_net_open(struct net_device *d); static int cosa_net_close(struct net_device *d); static void cosa_net_timeout(struct net_device *d, unsigned int txqueue); static netdev_tx_t cosa_net_tx(struct sk_buff *skb, struct net_device *d); static char *cosa_net_setup_rx(struct channel_data *channel, int size); static int cosa_net_rx_done(struct channel_data *channel); static int cosa_net_tx_done(struct channel_data *channel, int size); static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); /* Character device */ static char *chrdev_setup_rx(struct channel_data *channel, int size); static int chrdev_rx_done(struct channel_data *channel); static int chrdev_tx_done(struct channel_data *channel, int size); static ssize_t cosa_read(struct file *file, char __user *buf, size_t count, loff_t *ppos); static ssize_t cosa_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos); static unsigned int cosa_poll(struct file *file, poll_table *poll); static int cosa_open(struct inode *inode, struct file *file); static int cosa_release(struct inode *inode, struct file *file); static long cosa_chardev_ioctl(struct file *file, unsigned int cmd, unsigned long arg); #ifdef COSA_FASYNC_WORKING static int cosa_fasync(struct inode *inode, struct file *file, int on); #endif static const struct file_operations cosa_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .read = cosa_read, .write = cosa_write, .poll = cosa_poll, .unlocked_ioctl = cosa_chardev_ioctl, .open = cosa_open, .release = cosa_release, #ifdef COSA_FASYNC_WORKING .fasync = cosa_fasync, #endif }; /* Ioctls */ static int cosa_start(struct cosa_data *cosa, int address); static int cosa_reset(struct cosa_data *cosa); static int cosa_download(struct cosa_data *cosa, void __user *a); static int cosa_readmem(struct cosa_data *cosa, void __user *a); /* COSA/SRP ROM monitor */ static int download(struct cosa_data *cosa, const char __user *data, int addr, int len); static int startmicrocode(struct cosa_data *cosa, int address); static int readmem(struct cosa_data *cosa, char __user *data, int addr, int len); static int cosa_reset_and_read_id(struct cosa_data *cosa, char *id); /* Auxiliary functions */ static int get_wait_data(struct cosa_data *cosa); static int put_wait_data(struct cosa_data *cosa, int data); static int puthexnumber(struct cosa_data *cosa, int number); static void put_driver_status(struct cosa_data *cosa); static void put_driver_status_nolock(struct cosa_data *cosa); /* Interrupt handling */ static irqreturn_t cosa_interrupt(int irq, void *cosa); /* I/O ops debugging */ #ifdef DEBUG_IO static void debug_data_in(struct cosa_data *cosa, int data); static void debug_data_out(struct cosa_data *cosa, int data); static void debug_data_cmd(struct cosa_data *cosa, int data); static void debug_status_in(struct cosa_data *cosa, int status); static void debug_status_out(struct cosa_data *cosa, int status); #endif static inline struct channel_data* dev_to_chan(struct net_device *dev) { return (struct channel_data *)dev_to_hdlc(dev)->priv; } /* ---------- Initialization stuff ---------- */ static int __init cosa_init(void) { int i, err = 0; if (cosa_major > 0) { if (register_chrdev(cosa_major, "cosa", &cosa_fops)) { pr_warn("unable to get major %d\n", cosa_major); err = -EIO; goto out; } } else { if (!(cosa_major=register_chrdev(0, "cosa", &cosa_fops))) { pr_warn("unable to register chardev\n"); err = -EIO; goto out; } } for (i=0; i<MAX_CARDS; i++) cosa_cards[i].num = -1; for (i=0; io[i] != 0 && i < MAX_CARDS; i++) cosa_probe(io[i], irq[i], dma[i]); if (!nr_cards) { pr_warn("no devices found\n"); unregister_chrdev(cosa_major, "cosa"); err = -ENODEV; goto out; } cosa_class = class_create(THIS_MODULE, "cosa"); if (IS_ERR(cosa_class)) { err = PTR_ERR(cosa_class); goto out_chrdev; } for (i = 0; i < nr_cards; i++) device_create(cosa_class, NULL, MKDEV(cosa_major, i), NULL, "cosa%d", i); err = 0; goto out; out_chrdev: unregister_chrdev(cosa_major, "cosa"); out: return err; } module_init(cosa_init); static void __exit cosa_exit(void) { struct cosa_data *cosa; int i; for (i = 0; i < nr_cards; i++) device_destroy(cosa_class, MKDEV(cosa_major, i)); class_destroy(cosa_class); for (cosa = cosa_cards; nr_cards--; cosa++) { /* Clean up the per-channel data */ for (i = 0; i < cosa->nchannels; i++) { /* Chardev driver has no alloc'd per-channel data */ unregister_hdlc_device(cosa->chan[i].netdev); free_netdev(cosa->chan[i].netdev); } /* Clean up the per-card data */ kfree(cosa->chan); kfree(cosa->bouncebuf); free_irq(cosa->irq, cosa); free_dma(cosa->dma); release_region(cosa->datareg, is_8bit(cosa) ? 2 : 4); } unregister_chrdev(cosa_major, "cosa"); } module_exit(cosa_exit); static const struct net_device_ops cosa_ops = { .ndo_open = cosa_net_open, .ndo_stop = cosa_net_close, .ndo_start_xmit = hdlc_start_xmit, .ndo_do_ioctl = cosa_net_ioctl, .ndo_tx_timeout = cosa_net_timeout, }; static int cosa_probe(int base, int irq, int dma) { struct cosa_data *cosa = cosa_cards+nr_cards; int i, err = 0; memset(cosa, 0, sizeof(struct cosa_data)); /* Checking validity of parameters: */ /* IRQ should be 2-7 or 10-15; negative IRQ means autoprobe */ if ((irq >= 0 && irq < 2) || irq > 15 || (irq < 10 && irq > 7)) { pr_info("invalid IRQ %d\n", irq); return -1; } /* I/O address should be between 0x100 and 0x3ff and should be * multiple of 8. */ if (base < 0x100 || base > 0x3ff || base & 0x7) { pr_info("invalid I/O address 0x%x\n", base); return -1; } /* DMA should be 0,1 or 3-7 */ if (dma < 0 || dma == 4 || dma > 7) { pr_info("invalid DMA %d\n", dma); return -1; } /* and finally, on 16-bit COSA DMA should be 4-7 and * I/O base should not be multiple of 0x10 */ if (((base & 0x8) && dma < 4) || (!(base & 0x8) && dma > 3)) { pr_info("8/16 bit base and DMA mismatch (base=0x%x, dma=%d)\n", base, dma); return -1; } cosa->dma = dma; cosa->datareg = base; cosa->statusreg = is_8bit(cosa)?base+1:base+2; spin_lock_init(&cosa->lock); if (!request_region(base, is_8bit(cosa)?2:4,"cosa")) return -1; if (cosa_reset_and_read_id(cosa, cosa->id_string) < 0) { printk(KERN_DEBUG "probe at 0x%x failed.\n", base); err = -1; goto err_out; } /* Test the validity of identification string */ if (!strncmp(cosa->id_string, "SRP", 3)) cosa->type = "srp"; else if (!strncmp(cosa->id_string, "COSA", 4)) cosa->type = is_8bit(cosa)? "cosa8": "cosa16"; else { /* Print a warning only if we are not autoprobing */ #ifndef COSA_ISA_AUTOPROBE pr_info("valid signature not found at 0x%x\n", base); #endif err = -1; goto err_out; } /* Update the name of the region now we know the type of card */ release_region(base, is_8bit(cosa)?2:4); if (!request_region(base, is_8bit(cosa)?2:4, cosa->type)) { printk(KERN_DEBUG "changing name at 0x%x failed.\n", base); return -1; } /* Now do IRQ autoprobe */ if (irq < 0) { unsigned long irqs; /* pr_info("IRQ autoprobe\n"); */ irqs = probe_irq_on(); /* * Enable interrupt on tx buffer empty (it sure is) * really sure ? * FIXME: When this code is not used as module, we should * probably call udelay() instead of the interruptible sleep. */ set_current_state(TASK_INTERRUPTIBLE); cosa_putstatus(cosa, SR_TX_INT_ENA); schedule_timeout(msecs_to_jiffies(300)); irq = probe_irq_off(irqs); /* Disable all IRQs from the card */ cosa_putstatus(cosa, 0); /* Empty the received data register */ cosa_getdata8(cosa); if (irq < 0) { pr_info("multiple interrupts obtained (%d, board at 0x%x)\n", irq, cosa->datareg); err = -1; goto err_out; } if (irq == 0) { pr_info("no interrupt obtained (board at 0x%x)\n", cosa->datareg); /* return -1; */ } } cosa->irq = irq; cosa->num = nr_cards; cosa->usage = 0; cosa->nchannels = 2; /* FIXME: how to determine this? */ if (request_irq(cosa->irq, cosa_interrupt, 0, cosa->type, cosa)) { err = -1; goto err_out; } if (request_dma(cosa->dma, cosa->type)) { err = -1; goto err_out1; } cosa->bouncebuf = kmalloc(COSA_MTU, GFP_KERNEL|GFP_DMA); if (!cosa->bouncebuf) { err = -ENOMEM; goto err_out2; } sprintf(cosa->name, "cosa%d", cosa->num); /* Initialize the per-channel data */ cosa->chan = kcalloc(cosa->nchannels, sizeof(struct channel_data), GFP_KERNEL); if (!cosa->chan) { err = -ENOMEM; goto err_out3; } for (i = 0; i < cosa->nchannels; i++) { struct channel_data *chan = &cosa->chan[i]; chan->cosa = cosa; chan->num = i; sprintf(chan->name, "cosa%dc%d", chan->cosa->num, i); /* Initialize the chardev data structures */ mutex_init(&chan->rlock); sema_init(&chan->wsem, 1); /* Register the network interface */ if (!(chan->netdev = alloc_hdlcdev(chan))) { pr_warn("%s: alloc_hdlcdev failed\n", chan->name); err = -ENOMEM; goto err_hdlcdev; } dev_to_hdlc(chan->netdev)->attach = cosa_net_attach; dev_to_hdlc(chan->netdev)->xmit = cosa_net_tx; chan->netdev->netdev_ops = &cosa_ops; chan->netdev->watchdog_timeo = TX_TIMEOUT; chan->netdev->base_addr = chan->cosa->datareg; chan->netdev->irq = chan->cosa->irq; chan->netdev->dma = chan->cosa->dma; err = register_hdlc_device(chan->netdev); if (err) { netdev_warn(chan->netdev, "register_hdlc_device() failed\n"); free_netdev(chan->netdev); goto err_hdlcdev; } } pr_info("cosa%d: %s (%s at 0x%x irq %d dma %d), %d channels\n", cosa->num, cosa->id_string, cosa->type, cosa->datareg, cosa->irq, cosa->dma, cosa->nchannels); return nr_cards++; err_hdlcdev: while (i-- > 0) { unregister_hdlc_device(cosa->chan[i].netdev); free_netdev(cosa->chan[i].netdev); } kfree(cosa->chan); err_out3: kfree(cosa->bouncebuf); err_out2: free_dma(cosa->dma); err_out1: free_irq(cosa->irq, cosa); err_out: release_region(cosa->datareg,is_8bit(cosa)?2:4); pr_notice("cosa%d: allocating resources failed\n", cosa->num); return err; } /*---------- network device ---------- */ static int cosa_net_attach(struct net_device *dev, unsigned short encoding, unsigned short parity) { if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT) return 0; return -EINVAL; } static int cosa_net_open(struct net_device *dev) { struct channel_data *chan = dev_to_chan(dev); int err; unsigned long flags; if (!(chan->cosa->firmware_status & COSA_FW_START)) { pr_notice("%s: start the firmware first (status %d)\n", chan->cosa->name, chan->cosa->firmware_status); return -EPERM; } spin_lock_irqsave(&chan->cosa->lock, flags); if (chan->usage != 0) { pr_warn("%s: cosa_net_open called with usage count %d\n", chan->name, chan->usage); spin_unlock_irqrestore(&chan->cosa->lock, flags); return -EBUSY; } chan->setup_rx = cosa_net_setup_rx; chan->tx_done = cosa_net_tx_done; chan->rx_done = cosa_net_rx_done; chan->usage = -1; chan->cosa->usage++; spin_unlock_irqrestore(&chan->cosa->lock, flags); err = hdlc_open(dev); if (err) { spin_lock_irqsave(&chan->cosa->lock, flags); chan->usage = 0; chan->cosa->usage--; spin_unlock_irqrestore(&chan->cosa->lock, flags); return err; } netif_start_queue(dev); cosa_enable_rx(chan); return 0; } static netdev_tx_t cosa_net_tx(struct sk_buff *skb, struct net_device *dev) { struct channel_data *chan = dev_to_chan(dev); netif_stop_queue(dev); chan->tx_skb = skb; cosa_start_tx(chan, skb->data, skb->len); return NETDEV_TX_OK; } static void cosa_net_timeout(struct net_device *dev, unsigned int txqueue) { struct channel_data *chan = dev_to_chan(dev); if (test_bit(RXBIT, &chan->cosa->rxtx)) { chan->netdev->stats.rx_errors++; chan->netdev->stats.rx_missed_errors++; } else { chan->netdev->stats.tx_errors++; chan->netdev->stats.tx_aborted_errors++; } cosa_kick(chan->cosa); if (chan->tx_skb) { dev_kfree_skb(chan->tx_skb); chan->tx_skb = NULL; } netif_wake_queue(dev); } static int cosa_net_close(struct net_device *dev) { struct channel_data *chan = dev_to_chan(dev); unsigned long flags; netif_stop_queue(dev); hdlc_close(dev); cosa_disable_rx(chan); spin_lock_irqsave(&chan->cosa->lock, flags); if (chan->rx_skb) { kfree_skb(chan->rx_skb); chan->rx_skb = NULL; } if (chan->tx_skb) { kfree_skb(chan->tx_skb); chan->tx_skb = NULL; } chan->usage = 0; chan->cosa->usage--; spin_unlock_irqrestore(&chan->cosa->lock, flags); return 0; } static char *cosa_net_setup_rx(struct channel_data *chan, int size) { /* * We can safely fall back to non-dma-able memory, because we have * the cosa->bouncebuf pre-allocated. */ kfree_skb(chan->rx_skb); chan->rx_skb = dev_alloc_skb(size); if (chan->rx_skb == NULL) { pr_notice("%s: Memory squeeze, dropping packet\n", chan->name); chan->netdev->stats.rx_dropped++; return NULL; } netif_trans_update(chan->netdev); return skb_put(chan->rx_skb, size); } static int cosa_net_rx_done(struct channel_data *chan) { if (!chan->rx_skb) { pr_warn("%s: rx_done with empty skb!\n", chan->name); chan->netdev->stats.rx_errors++; chan->netdev->stats.rx_frame_errors++; return 0; } chan->rx_skb->protocol = hdlc_type_trans(chan->rx_skb, chan->netdev); chan->rx_skb->dev = chan->netdev; skb_reset_mac_header(chan->rx_skb); chan->netdev->stats.rx_packets++; chan->netdev->stats.rx_bytes += chan->cosa->rxsize; netif_rx(chan->rx_skb); chan->rx_skb = NULL; return 0; } /* ARGSUSED */ static int cosa_net_tx_done(struct channel_data *chan, int size) { if (!chan->tx_skb) { pr_warn("%s: tx_done with empty skb!\n", chan->name); chan->netdev->stats.tx_errors++; chan->netdev->stats.tx_aborted_errors++; return 1; } dev_consume_skb_irq(chan->tx_skb); chan->tx_skb = NULL; chan->netdev->stats.tx_packets++; chan->netdev->stats.tx_bytes += size; netif_wake_queue(chan->netdev); return 1; } /*---------- Character device ---------- */ static ssize_t cosa_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { DECLARE_WAITQUEUE(wait, current); unsigned long flags; struct channel_data *chan = file->private_data; struct cosa_data *cosa = chan->cosa; char *kbuf; if (!(cosa->firmware_status & COSA_FW_START)) { pr_notice("%s: start the firmware first (status %d)\n", cosa->name, cosa->firmware_status); return -EPERM; } if (mutex_lock_interruptible(&chan->rlock)) return -ERESTARTSYS; chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL); if (chan->rxdata == NULL) { mutex_unlock(&chan->rlock); return -ENOMEM; } chan->rx_status = 0; cosa_enable_rx(chan); spin_lock_irqsave(&cosa->lock, flags); add_wait_queue(&chan->rxwaitq, &wait); while (!chan->rx_status) { set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(&cosa->lock, flags); schedule(); spin_lock_irqsave(&cosa->lock, flags); if (signal_pending(current) && chan->rx_status == 0) { chan->rx_status = 1; remove_wait_queue(&chan->rxwaitq, &wait); __set_current_state(TASK_RUNNING); spin_unlock_irqrestore(&cosa->lock, flags); mutex_unlock(&chan->rlock); return -ERESTARTSYS; } } remove_wait_queue(&chan->rxwaitq, &wait); __set_current_state(TASK_RUNNING); kbuf = chan->rxdata; count = chan->rxsize; spin_unlock_irqrestore(&cosa->lock, flags); mutex_unlock(&chan->rlock); if (copy_to_user(buf, kbuf, count)) { kfree(kbuf); return -EFAULT; } kfree(kbuf); return count; } static char *chrdev_setup_rx(struct channel_data *chan, int size) { /* Expect size <= COSA_MTU */ chan->rxsize = size; return chan->rxdata; } static int chrdev_rx_done(struct channel_data *chan) { if (chan->rx_status) { /* Reader has died */ kfree(chan->rxdata); up(&chan->wsem); } chan->rx_status = 1; wake_up_interruptible(&chan->rxwaitq); return 1; } static ssize_t cosa_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { DECLARE_WAITQUEUE(wait, current); struct channel_data *chan = file->private_data; struct cosa_data *cosa = chan->cosa; unsigned long flags; char *kbuf; if (!(cosa->firmware_status & COSA_FW_START)) { pr_notice("%s: start the firmware first (status %d)\n", cosa->name, cosa->firmware_status); return -EPERM; } if (down_interruptible(&chan->wsem)) return -ERESTARTSYS; if (count > COSA_MTU) count = COSA_MTU; /* Allocate the buffer */ kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA); if (kbuf == NULL) { up(&chan->wsem); return -ENOMEM; } if (copy_from_user(kbuf, buf, count)) { up(&chan->wsem); kfree(kbuf); return -EFAULT; } chan->tx_status=0; cosa_start_tx(chan, kbuf, count); spin_lock_irqsave(&cosa->lock, flags); add_wait_queue(&chan->txwaitq, &wait); while (!chan->tx_status) { set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(&cosa->lock, flags); schedule(); spin_lock_irqsave(&cosa->lock, flags); if (signal_pending(current) && chan->tx_status == 0) { chan->tx_status = 1; remove_wait_queue(&chan->txwaitq, &wait); __set_current_state(TASK_RUNNING); chan->tx_status = 1; spin_unlock_irqrestore(&cosa->lock, flags); up(&chan->wsem); return -ERESTARTSYS; } } remove_wait_queue(&chan->txwaitq, &wait); __set_current_state(TASK_RUNNING); up(&chan->wsem); spin_unlock_irqrestore(&cosa->lock, flags); kfree(kbuf); return count; } static int chrdev_tx_done(struct channel_data *chan, int size) { if (chan->tx_status) { /* Writer was interrupted */ kfree(chan->txbuf); up(&chan->wsem); } chan->tx_status = 1; wake_up_interruptible(&chan->txwaitq); return 1; } static __poll_t cosa_poll(struct file *file, poll_table *poll) { pr_info("cosa_poll is here\n"); return 0; } static int cosa_open(struct inode *inode, struct file *file) { struct cosa_data *cosa; struct channel_data *chan; unsigned long flags; int n; int ret = 0; mutex_lock(&cosa_chardev_mutex); if ((n=iminor(file_inode(file))>>CARD_MINOR_BITS) >= nr_cards) { ret = -ENODEV; goto out; } cosa = cosa_cards+n; if ((n=iminor(file_inode(file)) & ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) { ret = -ENODEV; goto out; } chan = cosa->chan + n; file->private_data = chan; spin_lock_irqsave(&cosa->lock, flags); if (chan->usage < 0) { /* in netdev mode */ spin_unlock_irqrestore(&cosa->lock, flags); ret = -EBUSY; goto out; } cosa->usage++; chan->usage++; chan->tx_done = chrdev_tx_done; chan->setup_rx = chrdev_setup_rx; chan->rx_done = chrdev_rx_done; spin_unlock_irqrestore(&cosa->lock, flags); out: mutex_unlock(&cosa_chardev_mutex); return ret; } static int cosa_release(struct inode *inode, struct file *file) { struct channel_data *channel = file->private_data; struct cosa_data *cosa; unsigned long flags; cosa = channel->cosa; spin_lock_irqsave(&cosa->lock, flags); cosa->usage--; channel->usage--; spin_unlock_irqrestore(&cosa->lock, flags); return 0; } #ifdef COSA_FASYNC_WORKING static struct fasync_struct *fasync[256] = { NULL, }; /* To be done ... */ static int cosa_fasync(struct inode *inode, struct file *file, int on) { int port = iminor(inode); return fasync_helper(inode, file, on, &fasync[port]); } #endif /* ---------- Ioctls ---------- */ /* * Ioctl subroutines can safely be made inline, because they are called * only from cosa_ioctl(). */ static inline int cosa_reset(struct cosa_data *cosa) { char idstring[COSA_MAX_ID_STRING]; if (cosa->usage > 1) pr_info("cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n", cosa->num, cosa->usage); cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START); if (cosa_reset_and_read_id(cosa, idstring) < 0) { pr_notice("cosa%d: reset failed\n", cosa->num); return -EIO; } pr_info("cosa%d: resetting device: %s\n", cosa->num, idstring); cosa->firmware_status |= COSA_FW_RESET; return 0; } /* High-level function to download data into COSA memory. Calls download() */ static inline int cosa_download(struct cosa_data *cosa, void __user *arg) { struct cosa_download d; int i; if (cosa->usage > 1) pr_info("%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", cosa->name, cosa->usage); if (!(cosa->firmware_status & COSA_FW_RESET)) { pr_notice("%s: reset the card first (status %d)\n", cosa->name, cosa->firmware_status); return -EPERM; } if (copy_from_user(&d, arg, sizeof(d))) return -EFAULT; if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE) return -EINVAL; if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE) return -EINVAL; /* If something fails, force the user to reset the card */ cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD); i = download(cosa, d.code, d.len, d.addr); if (i < 0) { pr_notice("cosa%d: microcode download failed: %d\n", cosa->num, i); return -EIO; } pr_info("cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n", cosa->num, d.len, d.addr); cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD; return 0; } /* High-level function to read COSA memory. Calls readmem() */ static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg) { struct cosa_download d; int i; if (cosa->usage > 1) pr_info("cosa%d: WARNING: readmem requested with cosa->usage > 1 (%d). Odd things may happen.\n", cosa->num, cosa->usage); if (!(cosa->firmware_status & COSA_FW_RESET)) { pr_notice("%s: reset the card first (status %d)\n", cosa->name, cosa->firmware_status); return -EPERM; } if (copy_from_user(&d, arg, sizeof(d))) return -EFAULT; /* If something fails, force the user to reset the card */ cosa->firmware_status &= ~COSA_FW_RESET; i = readmem(cosa, d.code, d.len, d.addr); if (i < 0) { pr_notice("cosa%d: reading memory failed: %d\n", cosa->num, i); return -EIO; } pr_info("cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n", cosa->num, d.len, d.addr); cosa->firmware_status |= COSA_FW_RESET; return 0; } /* High-level function to start microcode. Calls startmicrocode(). */ static inline int cosa_start(struct cosa_data *cosa, int address) { int i; if (cosa->usage > 1) pr_info("cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", cosa->num, cosa->usage); if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD)) != (COSA_FW_RESET|COSA_FW_DOWNLOAD)) { pr_notice("%s: download the microcode and/or reset the card first (status %d)\n", cosa->name, cosa->firmware_status); return -EPERM; } cosa->firmware_status &= ~COSA_FW_RESET; if ((i=startmicrocode(cosa, address)) < 0) { pr_notice("cosa%d: start microcode at 0x%04x failed: %d\n", cosa->num, address, i); return -EIO; } pr_info("cosa%d: starting microcode at 0x%04x\n", cosa->num, address); cosa->startaddr = address; cosa->firmware_status |= COSA_FW_START; return 0; } /* Buffer of size at least COSA_MAX_ID_STRING is expected */ static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string) { int l = strlen(cosa->id_string)+1; if (copy_to_user(string, cosa->id_string, l)) return -EFAULT; return l; } /* Buffer of size at least COSA_MAX_ID_STRING is expected */ static inline int cosa_gettype(struct cosa_data *cosa, char __user *string) { int l = strlen(cosa->type)+1; if (copy_to_user(string, cosa->type, l)) return -EFAULT; return l; } static int cosa_ioctl_common(struct cosa_data *cosa, struct channel_data *channel, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; switch (cmd) { case COSAIORSET: /* Reset the device */ if (!capable(CAP_NET_ADMIN)) return -EACCES; return cosa_reset(cosa); case COSAIOSTRT: /* Start the firmware */ if (!capable(CAP_SYS_RAWIO)) return -EACCES; return cosa_start(cosa, arg); case COSAIODOWNLD: /* Download the firmware */ if (!capable(CAP_SYS_RAWIO)) return -EACCES; return cosa_download(cosa, argp); case COSAIORMEM: if (!capable(CAP_SYS_RAWIO)) return -EACCES; return cosa_readmem(cosa, argp); case COSAIORTYPE: return cosa_gettype(cosa, argp); case COSAIORIDSTR: return cosa_getidstr(cosa, argp); case COSAIONRCARDS: return nr_cards; case COSAIONRCHANS: return cosa->nchannels; case COSAIOBMSET: if (!capable(CAP_SYS_RAWIO)) return -EACCES; if (is_8bit(cosa)) return -EINVAL; if (arg != COSA_BM_OFF && arg != COSA_BM_ON) return -EINVAL; cosa->busmaster = arg; return 0; case COSAIOBMGET: return cosa->busmaster; } return -ENOIOCTLCMD; } static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { int rv; struct channel_data *chan = dev_to_chan(dev); rv = cosa_ioctl_common(chan->cosa, chan, cmd, (unsigned long)ifr->ifr_data); if (rv != -ENOIOCTLCMD) return rv; return hdlc_ioctl(dev, ifr, cmd); } static long cosa_chardev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct channel_data *channel = file->private_data; struct cosa_data *cosa; long ret; mutex_lock(&cosa_chardev_mutex); cosa = channel->cosa; ret = cosa_ioctl_common(cosa, channel, cmd, arg); mutex_unlock(&cosa_chardev_mutex); return ret; } /*---------- HW layer interface ---------- */ /* * The higher layer can bind itself to the HW layer by setting the callbacks * in the channel_data structure and by using these routines. */ static void cosa_enable_rx(struct channel_data *chan) { struct cosa_data *cosa = chan->cosa; if (!test_and_set_bit(chan->num, &cosa->rxbitmap)) put_driver_status(cosa); } static void cosa_disable_rx(struct channel_data *chan) { struct cosa_data *cosa = chan->cosa; if (test_and_clear_bit(chan->num, &cosa->rxbitmap)) put_driver_status(cosa); } /* * FIXME: This routine probably should check for cosa_start_tx() called when * the previous transmit is still unfinished. In this case the non-zero * return value should indicate to the caller that the queuing(sp?) up * the transmit has failed. */ static int cosa_start_tx(struct channel_data *chan, char *buf, int len) { struct cosa_data *cosa = chan->cosa; unsigned long flags; #ifdef DEBUG_DATA int i; pr_info("cosa%dc%d: starting tx(0x%x)", chan->cosa->num, chan->num, len); for (i=0; i<len; i++) pr_cont(" %02x", buf[i]&0xff); pr_cont("\n"); #endif spin_lock_irqsave(&cosa->lock, flags); chan->txbuf = buf; chan->txsize = len; if (len > COSA_MTU) chan->txsize = COSA_MTU; spin_unlock_irqrestore(&cosa->lock, flags); /* Tell the firmware we are ready */ set_bit(chan->num, &cosa->txbitmap); put_driver_status(cosa); return 0; } static void put_driver_status(struct cosa_data *cosa) { unsigned long flags; int status; spin_lock_irqsave(&cosa->lock, flags); status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) | (cosa->txbitmap ? DRIVER_TX_READY : 0) | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) &DRIVER_TXMAP_MASK : 0); if (!cosa->rxtx) { if (cosa->rxbitmap|cosa->txbitmap) { if (!cosa->enabled) { cosa_putstatus(cosa, SR_RX_INT_ENA); #ifdef DEBUG_IO debug_status_out(cosa, SR_RX_INT_ENA); #endif cosa->enabled = 1; } } else if (cosa->enabled) { cosa->enabled = 0; cosa_putstatus(cosa, 0); #ifdef DEBUG_IO debug_status_out(cosa, 0); #endif } cosa_putdata8(cosa, status); #ifdef DEBUG_IO debug_data_cmd(cosa, status); #endif } spin_unlock_irqrestore(&cosa->lock, flags); } static void put_driver_status_nolock(struct cosa_data *cosa) { int status; status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) | (cosa->txbitmap ? DRIVER_TX_READY : 0) | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) &DRIVER_TXMAP_MASK : 0); if (cosa->rxbitmap|cosa->txbitmap) { cosa_putstatus(cosa, SR_RX_INT_ENA); #ifdef DEBUG_IO debug_status_out(cosa, SR_RX_INT_ENA); #endif cosa->enabled = 1; } else { cosa_putstatus(cosa, 0); #ifdef DEBUG_IO debug_status_out(cosa, 0); #endif cosa->enabled = 0; } cosa_putdata8(cosa, status); #ifdef DEBUG_IO debug_data_cmd(cosa, status); #endif } /* * The "kickme" function: When the DMA times out, this is called to * clean up the driver status. * FIXME: Preliminary support, the interface is probably wrong. */ static void cosa_kick(struct cosa_data *cosa) { unsigned long flags, flags1; char *s = "(probably) IRQ"; if (test_bit(RXBIT, &cosa->rxtx)) s = "RX DMA"; if (test_bit(TXBIT, &cosa->rxtx)) s = "TX DMA"; pr_info("%s: %s timeout - restarting\n", cosa->name, s); spin_lock_irqsave(&cosa->lock, flags); cosa->rxtx = 0; flags1 = claim_dma_lock(); disable_dma(cosa->dma); clear_dma_ff(cosa->dma); release_dma_lock(flags1); /* FIXME: Anything else? */ udelay(100); cosa_putstatus(cosa, 0); udelay(100); (void) cosa_getdata8(cosa); udelay(100); cosa_putdata8(cosa, 0); udelay(100); put_driver_status_nolock(cosa); spin_unlock_irqrestore(&cosa->lock, flags); } /* * Check if the whole buffer is DMA-able. It means it is below the 16M of * physical memory and doesn't span the 64k boundary. For now it seems * SKB's never do this, but we'll check this anyway. */ static int cosa_dma_able(struct channel_data *chan, char *buf, int len) { static int count; unsigned long b = (unsigned long)buf; if (b+len >= MAX_DMA_ADDRESS) return 0; if ((b^ (b+len)) & 0x10000) { if (count++ < 5) pr_info("%s: packet spanning a 64k boundary\n", chan->name); return 0; } return 1; } /* ---------- The SRP/COSA ROM monitor functions ---------- */ /* * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=", * drivers need to say 4-digit hex number meaning start address of the microcode * separated by a single space. Monitor replies by saying " =". Now driver * has to write 4-digit hex number meaning the last byte address ended * by a single space. Monitor has to reply with a space. Now the download * begins. After the download monitor replies with "\r\n." (CR LF dot). */ static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address) { int i; if (put_wait_data(cosa, 'w') == -1) return -1; if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;} if (get_wait_data(cosa) != '=') return -3; if (puthexnumber(cosa, address) < 0) return -4; if (put_wait_data(cosa, ' ') == -1) return -10; if (get_wait_data(cosa) != ' ') return -11; if (get_wait_data(cosa) != '=') return -12; if (puthexnumber(cosa, address+length-1) < 0) return -13; if (put_wait_data(cosa, ' ') == -1) return -18; if (get_wait_data(cosa) != ' ') return -19; while (length--) { char c; #ifndef SRP_DOWNLOAD_AT_BOOT if (get_user(c, microcode)) return -23; /* ??? */ #else c = *microcode; #endif if (put_wait_data(cosa, c) == -1) return -20; microcode++; } if (get_wait_data(cosa) != '\r') return -21; if (get_wait_data(cosa) != '\n') return -22; if (get_wait_data(cosa) != '.') return -23; #if 0 printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num); #endif return 0; } /* * Starting microcode is done via the "g" command of the SRP monitor. * The chat should be the following: "g" "g=" "<addr><CR>" * "<CR><CR><LF><CR><LF>". */ static int startmicrocode(struct cosa_data *cosa, int address) { if (put_wait_data(cosa, 'g') == -1) return -1; if (get_wait_data(cosa) != 'g') return -2; if (get_wait_data(cosa) != '=') return -3; if (puthexnumber(cosa, address) < 0) return -4; if (put_wait_data(cosa, '\r') == -1) return -5; if (get_wait_data(cosa) != '\r') return -6; if (get_wait_data(cosa) != '\r') return -7; if (get_wait_data(cosa) != '\n') return -8; if (get_wait_data(cosa) != '\r') return -9; if (get_wait_data(cosa) != '\n') return -10; #if 0 printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num); #endif return 0; } /* * Reading memory is done via the "r" command of the SRP monitor. * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " " * Then driver can read the data and the conversation is finished * by SRP monitor sending "<CR><LF>." (dot at the end). * * This routine is not needed during the normal operation and serves * for debugging purposes only. */ static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address) { if (put_wait_data(cosa, 'r') == -1) return -1; if ((get_wait_data(cosa)) != 'r') return -2; if ((get_wait_data(cosa)) != '=') return -3; if (puthexnumber(cosa, address) < 0) return -4; if (put_wait_data(cosa, ' ') == -1) return -5; if (get_wait_data(cosa) != ' ') return -6; if (get_wait_data(cosa) != '=') return -7; if (puthexnumber(cosa, address+length-1) < 0) return -8; if (put_wait_data(cosa, ' ') == -1) return -9; if (get_wait_data(cosa) != ' ') return -10; while (length--) { char c; int i; if ((i=get_wait_data(cosa)) == -1) { pr_info("0x%04x bytes remaining\n", length); return -11; } c=i; #if 1 if (put_user(c, microcode)) return -23; /* ??? */ #else *microcode = c; #endif microcode++; } if (get_wait_data(cosa) != '\r') return -21; if (get_wait_data(cosa) != '\n') return -22; if (get_wait_data(cosa) != '.') return -23; #if 0 printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num); #endif return 0; } /* * This function resets the device and reads the initial prompt * of the device's ROM monitor. */ static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring) { int i=0, id=0, prev=0, curr=0; /* Reset the card ... */ cosa_putstatus(cosa, 0); cosa_getdata8(cosa); cosa_putstatus(cosa, SR_RST); msleep(500); /* Disable all IRQs from the card */ cosa_putstatus(cosa, 0); /* * Try to read the ID string. The card then prints out the * identification string ended by the "\n\x2e". * * The following loop is indexed through i (instead of id) * to avoid looping forever when for any reason * the port returns '\r', '\n' or '\x2e' permanently. */ for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) { if ((curr = get_wait_data(cosa)) == -1) { return -1; } curr &= 0xff; if (curr != '\r' && curr != '\n' && curr != 0x2e) idstring[id++] = curr; if (curr == 0x2e && prev == '\n') break; } /* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */ idstring[id] = '\0'; return id; } /* ---------- Auxiliary routines for COSA/SRP monitor ---------- */ /* * This routine gets the data byte from the card waiting for the SR_RX_RDY * bit to be set in a loop. It should be used in the exceptional cases * only (for example when resetting the card or downloading the firmware. */ static int get_wait_data(struct cosa_data *cosa) { int retries = 1000; while (--retries) { /* read data and return them */ if (cosa_getstatus(cosa) & SR_RX_RDY) { short r; r = cosa_getdata8(cosa); #if 0 pr_info("get_wait_data returning after %d retries\n", 999-retries); #endif return r; } /* sleep if not ready to read */ schedule_timeout_interruptible(1); } pr_info("timeout in get_wait_data (status 0x%x)\n", cosa_getstatus(cosa)); return -1; } /* * This routine puts the data byte to the card waiting for the SR_TX_RDY * bit to be set in a loop. It should be used in the exceptional cases * only (for example when resetting the card or downloading the firmware). */ static int put_wait_data(struct cosa_data *cosa, int data) { int retries = 1000; while (--retries) { /* read data and return them */ if (cosa_getstatus(cosa) & SR_TX_RDY) { cosa_putdata8(cosa, data); #if 0 pr_info("Putdata: %d retries\n", 999-retries); #endif return 0; } #if 0 /* sleep if not ready to read */ schedule_timeout_interruptible(1); #endif } pr_info("cosa%d: timeout in put_wait_data (status 0x%x)\n", cosa->num, cosa_getstatus(cosa)); return -1; } /* * The following routine puts the hexadecimal number into the SRP monitor * and verifies the proper echo of the sent bytes. Returns 0 on success, * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed, * (-2,-4,-6,-8) means that reading echo failed. */ static int puthexnumber(struct cosa_data *cosa, int number) { char temp[5]; int i; /* Well, I should probably replace this by something faster. */ sprintf(temp, "%04X", number); for (i=0; i<4; i++) { if (put_wait_data(cosa, temp[i]) == -1) { pr_notice("cosa%d: puthexnumber failed to write byte %d\n", cosa->num, i); return -1-2*i; } if (get_wait_data(cosa) != temp[i]) { pr_notice("cosa%d: puthexhumber failed to read echo of byte %d\n", cosa->num, i); return -2-2*i; } } return 0; } /* ---------- Interrupt routines ---------- */ /* * There are three types of interrupt: * At the beginning of transmit - this handled is in tx_interrupt(), * at the beginning of receive - it is in rx_interrupt() and * at the end of transmit/receive - it is the eot_interrupt() function. * These functions are multiplexed by cosa_interrupt() according to the * COSA status byte. I have moved the rx/tx/eot interrupt handling into * separate functions to make it more readable. These functions are inline, * so there should be no overhead of function call. * * In the COSA bus-master mode, we need to tell the card the address of a * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait. * It's time to use the bottom half :-( */ /* * Transmit interrupt routine - called when COSA is willing to obtain * data from the OS. The most tricky part of the routine is selection * of channel we (OS) want to send packet for. For SRP we should probably * use the round-robin approach. The newer COSA firmwares have a simple * flow-control - in the status word has bits 2 and 3 set to 1 means that the * channel 0 or 1 doesn't want to receive data. * * It seems there is a bug in COSA firmware (need to trace it further): * When the driver status says that the kernel has no more data for transmit * (e.g. at the end of TX DMA) and then the kernel changes its mind * (e.g. new packet is queued to hard_start_xmit()), the card issues * the TX interrupt but does not mark the channel as ready-to-transmit. * The fix seems to be to push the packet to COSA despite its request. * We first try to obey the card's opinion, and then fall back to forced TX. */ static inline void tx_interrupt(struct cosa_data *cosa, int status) { unsigned long flags, flags1; #ifdef DEBUG_IRQS pr_info("cosa%d: SR_DOWN_REQUEST status=0x%04x\n", cosa->num, status); #endif spin_lock_irqsave(&cosa->lock, flags); set_bit(TXBIT, &cosa->rxtx); if (!test_bit(IRQBIT, &cosa->rxtx)) { /* flow control, see the comment above */ int i=0; if (!cosa->txbitmap) { pr_warn("%s: No channel wants data in TX IRQ. Expect DMA timeout.\n", cosa->name); put_driver_status_nolock(cosa); clear_bit(TXBIT, &cosa->rxtx); spin_unlock_irqrestore(&cosa->lock, flags); return; } while (1) { cosa->txchan++; i++; if (cosa->txchan >= cosa->nchannels) cosa->txchan = 0; if (!(cosa->txbitmap & (1<<cosa->txchan))) continue; if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT))) break; /* in second pass, accept first ready-to-TX channel */ if (i > cosa->nchannels) { /* Can be safely ignored */ #ifdef DEBUG_IRQS printk(KERN_DEBUG "%s: Forcing TX " "to not-ready channel %d\n", cosa->name, cosa->txchan); #endif break; } } cosa->txsize = cosa->chan[cosa->txchan].txsize; if (cosa_dma_able(cosa->chan+cosa->txchan, cosa->chan[cosa->txchan].txbuf, cosa->txsize)) { cosa->txbuf = cosa->chan[cosa->txchan].txbuf; } else { memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf, cosa->txsize); cosa->txbuf = cosa->bouncebuf; } } if (is_8bit(cosa)) { if (!test_bit(IRQBIT, &cosa->rxtx)) { cosa_putstatus(cosa, SR_TX_INT_ENA); cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)| ((cosa->txsize >> 8) & 0x1f)); #ifdef DEBUG_IO debug_status_out(cosa, SR_TX_INT_ENA); debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)| ((cosa->txsize >> 8) & 0x1f)); debug_data_in(cosa, cosa_getdata8(cosa)); #else cosa_getdata8(cosa); #endif set_bit(IRQBIT, &cosa->rxtx); spin_unlock_irqrestore(&cosa->lock, flags); return; } else { clear_bit(IRQBIT, &cosa->rxtx); cosa_putstatus(cosa, 0); cosa_putdata8(cosa, cosa->txsize&0xff); #ifdef DEBUG_IO debug_status_out(cosa, 0); debug_data_out(cosa, cosa->txsize&0xff); #endif } } else { cosa_putstatus(cosa, SR_TX_INT_ENA); cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000) | (cosa->txsize & 0x1fff)); #ifdef DEBUG_IO debug_status_out(cosa, SR_TX_INT_ENA); debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000) | (cosa->txsize & 0x1fff)); debug_data_in(cosa, cosa_getdata8(cosa)); debug_status_out(cosa, 0); #else cosa_getdata8(cosa); #endif cosa_putstatus(cosa, 0); } if (cosa->busmaster) { unsigned long addr = virt_to_bus(cosa->txbuf); int count=0; pr_info("busmaster IRQ\n"); while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { count++; udelay(10); if (count > 1000) break; } pr_info("status %x\n", cosa_getstatus(cosa)); pr_info("ready after %d loops\n", count); cosa_putdata16(cosa, (addr >> 16)&0xffff); count = 0; while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { count++; if (count > 1000) break; udelay(10); } pr_info("ready after %d loops\n", count); cosa_putdata16(cosa, addr &0xffff); flags1 = claim_dma_lock(); set_dma_mode(cosa->dma, DMA_MODE_CASCADE); enable_dma(cosa->dma); release_dma_lock(flags1); } else { /* start the DMA */ flags1 = claim_dma_lock(); disable_dma(cosa->dma); clear_dma_ff(cosa->dma); set_dma_mode(cosa->dma, DMA_MODE_WRITE); set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf)); set_dma_count(cosa->dma, cosa->txsize); enable_dma(cosa->dma); release_dma_lock(flags1); } cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); #ifdef DEBUG_IO debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); #endif spin_unlock_irqrestore(&cosa->lock, flags); } static inline void rx_interrupt(struct cosa_data *cosa, int status) { unsigned long flags; #ifdef DEBUG_IRQS pr_info("cosa%d: SR_UP_REQUEST\n", cosa->num); #endif spin_lock_irqsave(&cosa->lock, flags); set_bit(RXBIT, &cosa->rxtx); if (is_8bit(cosa)) { if (!test_bit(IRQBIT, &cosa->rxtx)) { set_bit(IRQBIT, &cosa->rxtx); put_driver_status_nolock(cosa); cosa->rxsize = cosa_getdata8(cosa) <<8; #ifdef DEBUG_IO debug_data_in(cosa, cosa->rxsize >> 8); #endif spin_unlock_irqrestore(&cosa->lock, flags); return; } else { clear_bit(IRQBIT, &cosa->rxtx); cosa->rxsize |= cosa_getdata8(cosa) & 0xff; #ifdef DEBUG_IO debug_data_in(cosa, cosa->rxsize & 0xff); #endif #if 0 pr_info("cosa%d: receive rxsize = (0x%04x)\n", cosa->num, cosa->rxsize); #endif } } else { cosa->rxsize = cosa_getdata16(cosa); #ifdef DEBUG_IO debug_data_in(cosa, cosa->rxsize); #endif #if 0 pr_info("cosa%d: receive rxsize = (0x%04x)\n", cosa->num, cosa->rxsize); #endif } if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) { pr_warn("%s: rx for unknown channel (0x%04x)\n", cosa->name, cosa->rxsize); spin_unlock_irqrestore(&cosa->lock, flags); goto reject; } cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13); cosa->rxsize &= 0x1fff; spin_unlock_irqrestore(&cosa->lock, flags); cosa->rxbuf = NULL; if (cosa->rxchan->setup_rx) cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize); if (!cosa->rxbuf) { reject: /* Reject the packet */ pr_info("cosa%d: rejecting packet on channel %d\n", cosa->num, cosa->rxchan->num); cosa->rxbuf = cosa->bouncebuf; } /* start the DMA */ flags = claim_dma_lock(); disable_dma(cosa->dma); clear_dma_ff(cosa->dma); set_dma_mode(cosa->dma, DMA_MODE_READ); if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) { set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf)); } else { set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf)); } set_dma_count(cosa->dma, (cosa->rxsize&0x1fff)); enable_dma(cosa->dma); release_dma_lock(flags); spin_lock_irqsave(&cosa->lock, flags); cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); if (!is_8bit(cosa) && (status & SR_TX_RDY)) cosa_putdata8(cosa, DRIVER_RX_READY); #ifdef DEBUG_IO debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); if (!is_8bit(cosa) && (status & SR_TX_RDY)) debug_data_cmd(cosa, DRIVER_RX_READY); #endif spin_unlock_irqrestore(&cosa->lock, flags); } static inline void eot_interrupt(struct cosa_data *cosa, int status) { unsigned long flags, flags1; spin_lock_irqsave(&cosa->lock, flags); flags1 = claim_dma_lock(); disable_dma(cosa->dma); clear_dma_ff(cosa->dma); release_dma_lock(flags1); if (test_bit(TXBIT, &cosa->rxtx)) { struct channel_data *chan = cosa->chan+cosa->txchan; if (chan->tx_done) if (chan->tx_done(chan, cosa->txsize)) clear_bit(chan->num, &cosa->txbitmap); } else if (test_bit(RXBIT, &cosa->rxtx)) { #ifdef DEBUG_DATA { int i; pr_info("cosa%dc%d: done rx(0x%x)", cosa->num, cosa->rxchan->num, cosa->rxsize); for (i=0; i<cosa->rxsize; i++) pr_cont(" %02x", cosa->rxbuf[i]&0xff); pr_cont("\n"); } #endif /* Packet for unknown channel? */ if (cosa->rxbuf == cosa->bouncebuf) goto out; if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize)) memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize); if (cosa->rxchan->rx_done) if (cosa->rxchan->rx_done(cosa->rxchan)) clear_bit(cosa->rxchan->num, &cosa->rxbitmap); } else { pr_notice("cosa%d: unexpected EOT interrupt\n", cosa->num); } /* * Clear the RXBIT, TXBIT and IRQBIT (the latest should be * cleared anyway). We should do it as soon as possible * so that we can tell the COSA we are done and to give it a time * for recovery. */ out: cosa->rxtx = 0; put_driver_status_nolock(cosa); spin_unlock_irqrestore(&cosa->lock, flags); } static irqreturn_t cosa_interrupt(int irq, void *cosa_) { unsigned status; int count = 0; struct cosa_data *cosa = cosa_; again: status = cosa_getstatus(cosa); #ifdef DEBUG_IRQS pr_info("cosa%d: got IRQ, status 0x%02x\n", cosa->num, status & 0xff); #endif #ifdef DEBUG_IO debug_status_in(cosa, status); #endif switch (status & SR_CMD_FROM_SRP_MASK) { case SR_DOWN_REQUEST: tx_interrupt(cosa, status); break; case SR_UP_REQUEST: rx_interrupt(cosa, status); break; case SR_END_OF_TRANSFER: eot_interrupt(cosa, status); break; default: /* We may be too fast for SRP. Try to wait a bit more. */ if (count++ < 100) { udelay(100); goto again; } pr_info("cosa%d: unknown status 0x%02x in IRQ after %d retries\n", cosa->num, status & 0xff, count); } #ifdef DEBUG_IRQS if (count) pr_info("%s: %d-times got unknown status in IRQ\n", cosa->name, count); else pr_info("%s: returning from IRQ\n", cosa->name); #endif return IRQ_HANDLED; } /* ---------- I/O debugging routines ---------- */ /* * These routines can be used to monitor COSA/SRP I/O and to printk() * the data being transferred on the data and status I/O port in a * readable way. */ #ifdef DEBUG_IO static void debug_status_in(struct cosa_data *cosa, int status) { char *s; switch (status & SR_CMD_FROM_SRP_MASK) { case SR_UP_REQUEST: s = "RX_REQ"; break; case SR_DOWN_REQUEST: s = "TX_REQ"; break; case SR_END_OF_TRANSFER: s = "ET_REQ"; break; default: s = "NO_REQ"; break; } pr_info("%s: IO: status -> 0x%02x (%s%s%s%s)\n", cosa->name, status, status & SR_USR_RQ ? "USR_RQ|" : "", status & SR_TX_RDY ? "TX_RDY|" : "", status & SR_RX_RDY ? "RX_RDY|" : "", s); } static void debug_status_out(struct cosa_data *cosa, int status) { pr_info("%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n", cosa->name, status, status & SR_RX_DMA_ENA ? "RXDMA|" : "!rxdma|", status & SR_TX_DMA_ENA ? "TXDMA|" : "!txdma|", status & SR_RST ? "RESET|" : "", status & SR_USR_INT_ENA ? "USRINT|" : "!usrint|", status & SR_TX_INT_ENA ? "TXINT|" : "!txint|", status & SR_RX_INT_ENA ? "RXINT" : "!rxint"); } static void debug_data_in(struct cosa_data *cosa, int data) { pr_info("%s: IO: data -> 0x%04x\n", cosa->name, data); } static void debug_data_out(struct cosa_data *cosa, int data) { pr_info("%s: IO: data <- 0x%04x\n", cosa->name, data); } static void debug_data_cmd(struct cosa_data *cosa, int data) { pr_info("%s: IO: data <- 0x%04x (%s|%s)\n", cosa->name, data, data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy", data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy"); } #endif /* EOF -- this file has not been truncated */
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