| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Patrick Gefre | 10016 | 94.27% | 7 | 15.56% |
| Brent Casavant | 369 | 3.47% | 5 | 11.11% |
| Alan Cox | 77 | 0.72% | 6 | 13.33% |
| Jean Delvare | 42 | 0.40% | 2 | 4.44% |
| Souptick Joarder | 22 | 0.21% | 1 | 2.22% |
| Harvey Harrison | 16 | 0.15% | 1 | 2.22% |
| Amol Lad | 16 | 0.15% | 1 | 2.22% |
| Jiri Slaby | 16 | 0.15% | 5 | 11.11% |
| Greg Kroah-Hartman | 14 | 0.13% | 3 | 6.67% |
| Takashi Iwai | 10 | 0.09% | 1 | 2.22% |
| Wei Yongjun | 6 | 0.06% | 1 | 2.22% |
| Burman Yan | 3 | 0.03% | 1 | 2.22% |
| Chen Gang S | 3 | 0.03% | 1 | 2.22% |
| Tejun Heo | 3 | 0.03% | 1 | 2.22% |
| Joe Perches | 2 | 0.02% | 1 | 2.22% |
| Andrew Morton | 2 | 0.02% | 1 | 2.22% |
| Russell King | 2 | 0.02% | 1 | 2.22% |
| David Howells | 1 | 0.01% | 1 | 2.22% |
| Randy Dunlap | 1 | 0.01% | 1 | 2.22% |
| Thomas Gleixner | 1 | 0.01% | 1 | 2.22% |
| Masahiro Yamada | 1 | 0.01% | 1 | 2.22% |
| Bhumika Goyal | 1 | 0.01% | 1 | 2.22% |
| Jingoo Han | 1 | 0.01% | 1 | 2.22% |
| Total | 10625 | 45 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2003-2006 Silicon Graphics, Inc. All Rights Reserved. */ /* * This file contains a module version of the ioc4 serial driver. This * includes all the support functions needed (support functions, etc.) * and the serial driver itself. */ #include <linux/errno.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial.h> #include <linux/circ_buf.h> #include <linux/serial_reg.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/ioc4.h> #include <linux/serial_core.h> #include <linux/slab.h> /* * interesting things about the ioc4 */ #define IOC4_NUM_SERIAL_PORTS 4 /* max ports per card */ #define IOC4_NUM_CARDS 8 /* max cards per partition */ #define GET_SIO_IR(_n) (_n == 0) ? (IOC4_SIO_IR_S0) : \ (_n == 1) ? (IOC4_SIO_IR_S1) : \ (_n == 2) ? (IOC4_SIO_IR_S2) : \ (IOC4_SIO_IR_S3) #define GET_OTHER_IR(_n) (_n == 0) ? (IOC4_OTHER_IR_S0_MEMERR) : \ (_n == 1) ? (IOC4_OTHER_IR_S1_MEMERR) : \ (_n == 2) ? (IOC4_OTHER_IR_S2_MEMERR) : \ (IOC4_OTHER_IR_S3_MEMERR) /* * All IOC4 registers are 32 bits wide. */ /* * PCI Memory Space Map */ #define IOC4_PCI_ERR_ADDR_L 0x000 /* Low Error Address */ #define IOC4_PCI_ERR_ADDR_VLD (0x1 << 0) #define IOC4_PCI_ERR_ADDR_MST_ID_MSK (0xf << 1) #define IOC4_PCI_ERR_ADDR_MST_NUM_MSK (0xe << 1) #define IOC4_PCI_ERR_ADDR_MST_TYP_MSK (0x1 << 1) #define IOC4_PCI_ERR_ADDR_MUL_ERR (0x1 << 5) #define IOC4_PCI_ERR_ADDR_ADDR_MSK (0x3ffffff << 6) /* Interrupt types */ #define IOC4_SIO_INTR_TYPE 0 #define IOC4_OTHER_INTR_TYPE 1 #define IOC4_NUM_INTR_TYPES 2 /* Bitmasks for IOC4_SIO_IR, IOC4_SIO_IEC, and IOC4_SIO_IES */ #define IOC4_SIO_IR_S0_TX_MT 0x00000001 /* Serial port 0 TX empty */ #define IOC4_SIO_IR_S0_RX_FULL 0x00000002 /* Port 0 RX buf full */ #define IOC4_SIO_IR_S0_RX_HIGH 0x00000004 /* Port 0 RX hiwat */ #define IOC4_SIO_IR_S0_RX_TIMER 0x00000008 /* Port 0 RX timeout */ #define IOC4_SIO_IR_S0_DELTA_DCD 0x00000010 /* Port 0 delta DCD */ #define IOC4_SIO_IR_S0_DELTA_CTS 0x00000020 /* Port 0 delta CTS */ #define IOC4_SIO_IR_S0_INT 0x00000040 /* Port 0 pass-thru intr */ #define IOC4_SIO_IR_S0_TX_EXPLICIT 0x00000080 /* Port 0 explicit TX thru */ #define IOC4_SIO_IR_S1_TX_MT 0x00000100 /* Serial port 1 */ #define IOC4_SIO_IR_S1_RX_FULL 0x00000200 /* */ #define IOC4_SIO_IR_S1_RX_HIGH 0x00000400 /* */ #define IOC4_SIO_IR_S1_RX_TIMER 0x00000800 /* */ #define IOC4_SIO_IR_S1_DELTA_DCD 0x00001000 /* */ #define IOC4_SIO_IR_S1_DELTA_CTS 0x00002000 /* */ #define IOC4_SIO_IR_S1_INT 0x00004000 /* */ #define IOC4_SIO_IR_S1_TX_EXPLICIT 0x00008000 /* */ #define IOC4_SIO_IR_S2_TX_MT 0x00010000 /* Serial port 2 */ #define IOC4_SIO_IR_S2_RX_FULL 0x00020000 /* */ #define IOC4_SIO_IR_S2_RX_HIGH 0x00040000 /* */ #define IOC4_SIO_IR_S2_RX_TIMER 0x00080000 /* */ #define IOC4_SIO_IR_S2_DELTA_DCD 0x00100000 /* */ #define IOC4_SIO_IR_S2_DELTA_CTS 0x00200000 /* */ #define IOC4_SIO_IR_S2_INT 0x00400000 /* */ #define IOC4_SIO_IR_S2_TX_EXPLICIT 0x00800000 /* */ #define IOC4_SIO_IR_S3_TX_MT 0x01000000 /* Serial port 3 */ #define IOC4_SIO_IR_S3_RX_FULL 0x02000000 /* */ #define IOC4_SIO_IR_S3_RX_HIGH 0x04000000 /* */ #define IOC4_SIO_IR_S3_RX_TIMER 0x08000000 /* */ #define IOC4_SIO_IR_S3_DELTA_DCD 0x10000000 /* */ #define IOC4_SIO_IR_S3_DELTA_CTS 0x20000000 /* */ #define IOC4_SIO_IR_S3_INT 0x40000000 /* */ #define IOC4_SIO_IR_S3_TX_EXPLICIT 0x80000000 /* */ /* Per device interrupt masks */ #define IOC4_SIO_IR_S0 (IOC4_SIO_IR_S0_TX_MT | \ IOC4_SIO_IR_S0_RX_FULL | \ IOC4_SIO_IR_S0_RX_HIGH | \ IOC4_SIO_IR_S0_RX_TIMER | \ IOC4_SIO_IR_S0_DELTA_DCD | \ IOC4_SIO_IR_S0_DELTA_CTS | \ IOC4_SIO_IR_S0_INT | \ IOC4_SIO_IR_S0_TX_EXPLICIT) #define IOC4_SIO_IR_S1 (IOC4_SIO_IR_S1_TX_MT | \ IOC4_SIO_IR_S1_RX_FULL | \ IOC4_SIO_IR_S1_RX_HIGH | \ IOC4_SIO_IR_S1_RX_TIMER | \ IOC4_SIO_IR_S1_DELTA_DCD | \ IOC4_SIO_IR_S1_DELTA_CTS | \ IOC4_SIO_IR_S1_INT | \ IOC4_SIO_IR_S1_TX_EXPLICIT) #define IOC4_SIO_IR_S2 (IOC4_SIO_IR_S2_TX_MT | \ IOC4_SIO_IR_S2_RX_FULL | \ IOC4_SIO_IR_S2_RX_HIGH | \ IOC4_SIO_IR_S2_RX_TIMER | \ IOC4_SIO_IR_S2_DELTA_DCD | \ IOC4_SIO_IR_S2_DELTA_CTS | \ IOC4_SIO_IR_S2_INT | \ IOC4_SIO_IR_S2_TX_EXPLICIT) #define IOC4_SIO_IR_S3 (IOC4_SIO_IR_S3_TX_MT | \ IOC4_SIO_IR_S3_RX_FULL | \ IOC4_SIO_IR_S3_RX_HIGH | \ IOC4_SIO_IR_S3_RX_TIMER | \ IOC4_SIO_IR_S3_DELTA_DCD | \ IOC4_SIO_IR_S3_DELTA_CTS | \ IOC4_SIO_IR_S3_INT | \ IOC4_SIO_IR_S3_TX_EXPLICIT) /* Bitmasks for IOC4_OTHER_IR, IOC4_OTHER_IEC, and IOC4_OTHER_IES */ #define IOC4_OTHER_IR_ATA_INT 0x00000001 /* ATAPI intr pass-thru */ #define IOC4_OTHER_IR_ATA_MEMERR 0x00000002 /* ATAPI DMA PCI error */ #define IOC4_OTHER_IR_S0_MEMERR 0x00000004 /* Port 0 PCI error */ #define IOC4_OTHER_IR_S1_MEMERR 0x00000008 /* Port 1 PCI error */ #define IOC4_OTHER_IR_S2_MEMERR 0x00000010 /* Port 2 PCI error */ #define IOC4_OTHER_IR_S3_MEMERR 0x00000020 /* Port 3 PCI error */ #define IOC4_OTHER_IR_KBD_INT 0x00000040 /* Keyboard/mouse */ #define IOC4_OTHER_IR_RESERVED 0x007fff80 /* Reserved */ #define IOC4_OTHER_IR_RT_INT 0x00800000 /* INT_OUT section output */ #define IOC4_OTHER_IR_GEN_INT 0xff000000 /* Generic pins */ #define IOC4_OTHER_IR_SER_MEMERR (IOC4_OTHER_IR_S0_MEMERR | IOC4_OTHER_IR_S1_MEMERR | \ IOC4_OTHER_IR_S2_MEMERR | IOC4_OTHER_IR_S3_MEMERR) /* Bitmasks for IOC4_SIO_CR */ #define IOC4_SIO_CR_CMD_PULSE_SHIFT 0 /* byte bus strobe shift */ #define IOC4_SIO_CR_ARB_DIAG_TX0 0x00000000 #define IOC4_SIO_CR_ARB_DIAG_RX0 0x00000010 #define IOC4_SIO_CR_ARB_DIAG_TX1 0x00000020 #define IOC4_SIO_CR_ARB_DIAG_RX1 0x00000030 #define IOC4_SIO_CR_ARB_DIAG_TX2 0x00000040 #define IOC4_SIO_CR_ARB_DIAG_RX2 0x00000050 #define IOC4_SIO_CR_ARB_DIAG_TX3 0x00000060 #define IOC4_SIO_CR_ARB_DIAG_RX3 0x00000070 #define IOC4_SIO_CR_SIO_DIAG_IDLE 0x00000080 /* 0 -> active request among serial ports (ro) */ /* Defs for some of the generic I/O pins */ #define IOC4_GPCR_UART0_MODESEL 0x10 /* Pin is output to port 0 mode sel */ #define IOC4_GPCR_UART1_MODESEL 0x20 /* Pin is output to port 1 mode sel */ #define IOC4_GPCR_UART2_MODESEL 0x40 /* Pin is output to port 2 mode sel */ #define IOC4_GPCR_UART3_MODESEL 0x80 /* Pin is output to port 3 mode sel */ #define IOC4_GPPR_UART0_MODESEL_PIN 4 /* GIO pin controlling uart 0 mode select */ #define IOC4_GPPR_UART1_MODESEL_PIN 5 /* GIO pin controlling uart 1 mode select */ #define IOC4_GPPR_UART2_MODESEL_PIN 6 /* GIO pin controlling uart 2 mode select */ #define IOC4_GPPR_UART3_MODESEL_PIN 7 /* GIO pin controlling uart 3 mode select */ /* Bitmasks for serial RX status byte */ #define IOC4_RXSB_OVERRUN 0x01 /* Char(s) lost */ #define IOC4_RXSB_PAR_ERR 0x02 /* Parity error */ #define IOC4_RXSB_FRAME_ERR 0x04 /* Framing error */ #define IOC4_RXSB_BREAK 0x08 /* Break character */ #define IOC4_RXSB_CTS 0x10 /* State of CTS */ #define IOC4_RXSB_DCD 0x20 /* State of DCD */ #define IOC4_RXSB_MODEM_VALID 0x40 /* DCD, CTS, and OVERRUN are valid */ #define IOC4_RXSB_DATA_VALID 0x80 /* Data byte, FRAME_ERR PAR_ERR * & BREAK valid */ /* Bitmasks for serial TX control byte */ #define IOC4_TXCB_INT_WHEN_DONE 0x20 /* Interrupt after this byte is sent */ #define IOC4_TXCB_INVALID 0x00 /* Byte is invalid */ #define IOC4_TXCB_VALID 0x40 /* Byte is valid */ #define IOC4_TXCB_MCR 0x80 /* Data<7:0> to modem control reg */ #define IOC4_TXCB_DELAY 0xc0 /* Delay data<7:0> mSec */ /* Bitmasks for IOC4_SBBR_L */ #define IOC4_SBBR_L_SIZE 0x00000001 /* 0 == 1KB rings, 1 == 4KB rings */ /* Bitmasks for IOC4_SSCR_<3:0> */ #define IOC4_SSCR_RX_THRESHOLD 0x000001ff /* Hiwater mark */ #define IOC4_SSCR_TX_TIMER_BUSY 0x00010000 /* TX timer in progress */ #define IOC4_SSCR_HFC_EN 0x00020000 /* Hardware flow control enabled */ #define IOC4_SSCR_RX_RING_DCD 0x00040000 /* Post RX record on delta-DCD */ #define IOC4_SSCR_RX_RING_CTS 0x00080000 /* Post RX record on delta-CTS */ #define IOC4_SSCR_DIAG 0x00200000 /* Bypass clock divider for sim */ #define IOC4_SSCR_RX_DRAIN 0x08000000 /* Drain RX buffer to memory */ #define IOC4_SSCR_DMA_EN 0x10000000 /* Enable ring buffer DMA */ #define IOC4_SSCR_DMA_PAUSE 0x20000000 /* Pause DMA */ #define IOC4_SSCR_PAUSE_STATE 0x40000000 /* Sets when PAUSE takes effect */ #define IOC4_SSCR_RESET 0x80000000 /* Reset DMA channels */ /* All producer/consumer pointers are the same bitfield */ #define IOC4_PROD_CONS_PTR_4K 0x00000ff8 /* For 4K buffers */ #define IOC4_PROD_CONS_PTR_1K 0x000003f8 /* For 1K buffers */ #define IOC4_PROD_CONS_PTR_OFF 3 /* Bitmasks for IOC4_SRCIR_<3:0> */ #define IOC4_SRCIR_ARM 0x80000000 /* Arm RX timer */ /* Bitmasks for IOC4_SHADOW_<3:0> */ #define IOC4_SHADOW_DR 0x00000001 /* Data ready */ #define IOC4_SHADOW_OE 0x00000002 /* Overrun error */ #define IOC4_SHADOW_PE 0x00000004 /* Parity error */ #define IOC4_SHADOW_FE 0x00000008 /* Framing error */ #define IOC4_SHADOW_BI 0x00000010 /* Break interrupt */ #define IOC4_SHADOW_THRE 0x00000020 /* Xmit holding register empty */ #define IOC4_SHADOW_TEMT 0x00000040 /* Xmit shift register empty */ #define IOC4_SHADOW_RFCE 0x00000080 /* Char in RX fifo has an error */ #define IOC4_SHADOW_DCTS 0x00010000 /* Delta clear to send */ #define IOC4_SHADOW_DDCD 0x00080000 /* Delta data carrier detect */ #define IOC4_SHADOW_CTS 0x00100000 /* Clear to send */ #define IOC4_SHADOW_DCD 0x00800000 /* Data carrier detect */ #define IOC4_SHADOW_DTR 0x01000000 /* Data terminal ready */ #define IOC4_SHADOW_RTS 0x02000000 /* Request to send */ #define IOC4_SHADOW_OUT1 0x04000000 /* 16550 OUT1 bit */ #define IOC4_SHADOW_OUT2 0x08000000 /* 16550 OUT2 bit */ #define IOC4_SHADOW_LOOP 0x10000000 /* Loopback enabled */ /* Bitmasks for IOC4_SRTR_<3:0> */ #define IOC4_SRTR_CNT 0x00000fff /* Reload value for RX timer */ #define IOC4_SRTR_CNT_VAL 0x0fff0000 /* Current value of RX timer */ #define IOC4_SRTR_CNT_VAL_SHIFT 16 #define IOC4_SRTR_HZ 16000 /* SRTR clock frequency */ /* Serial port register map used for DMA and PIO serial I/O */ struct ioc4_serialregs { uint32_t sscr; uint32_t stpir; uint32_t stcir; uint32_t srpir; uint32_t srcir; uint32_t srtr; uint32_t shadow; }; /* IOC4 UART register map */ struct ioc4_uartregs { char i4u_lcr; union { char iir; /* read only */ char fcr; /* write only */ } u3; union { char ier; /* DLAB == 0 */ char dlm; /* DLAB == 1 */ } u2; union { char rbr; /* read only, DLAB == 0 */ char thr; /* write only, DLAB == 0 */ char dll; /* DLAB == 1 */ } u1; char i4u_scr; char i4u_msr; char i4u_lsr; char i4u_mcr; }; /* short names */ #define i4u_dll u1.dll #define i4u_ier u2.ier #define i4u_dlm u2.dlm #define i4u_fcr u3.fcr /* Serial port registers used for DMA serial I/O */ struct ioc4_serial { uint32_t sbbr01_l; uint32_t sbbr01_h; uint32_t sbbr23_l; uint32_t sbbr23_h; struct ioc4_serialregs port_0; struct ioc4_serialregs port_1; struct ioc4_serialregs port_2; struct ioc4_serialregs port_3; struct ioc4_uartregs uart_0; struct ioc4_uartregs uart_1; struct ioc4_uartregs uart_2; struct ioc4_uartregs uart_3; }; /* UART clock speed */ #define IOC4_SER_XIN_CLK_66 66666667 #define IOC4_SER_XIN_CLK_33 33333333 #define IOC4_W_IES 0 #define IOC4_W_IEC 1 typedef void ioc4_intr_func_f(void *, uint32_t); typedef ioc4_intr_func_f *ioc4_intr_func_t; static unsigned int Num_of_ioc4_cards; /* defining this will get you LOTS of great debug info */ //#define DEBUG_INTERRUPTS #define DPRINT_CONFIG(_x...) ; //#define DPRINT_CONFIG(_x...) printk _x /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 /* number of characters we want to transmit to the lower level at a time */ #define IOC4_MAX_CHARS 256 #define IOC4_FIFO_CHARS 255 /* Device name we're using */ #define DEVICE_NAME_RS232 "ttyIOC" #define DEVICE_NAME_RS422 "ttyAIOC" #define DEVICE_MAJOR 204 #define DEVICE_MINOR_RS232 50 #define DEVICE_MINOR_RS422 84 /* register offsets */ #define IOC4_SERIAL_OFFSET 0x300 /* flags for next_char_state */ #define NCS_BREAK 0x1 #define NCS_PARITY 0x2 #define NCS_FRAMING 0x4 #define NCS_OVERRUN 0x8 /* cause we need SOME parameters ... */ #define MIN_BAUD_SUPPORTED 1200 #define MAX_BAUD_SUPPORTED 115200 /* protocol types supported */ #define PROTO_RS232 3 #define PROTO_RS422 7 /* Notification types */ #define N_DATA_READY 0x01 #define N_OUTPUT_LOWAT 0x02 #define N_BREAK 0x04 #define N_PARITY_ERROR 0x08 #define N_FRAMING_ERROR 0x10 #define N_OVERRUN_ERROR 0x20 #define N_DDCD 0x40 #define N_DCTS 0x80 #define N_ALL_INPUT (N_DATA_READY | N_BREAK | \ N_PARITY_ERROR | N_FRAMING_ERROR | \ N_OVERRUN_ERROR | N_DDCD | N_DCTS) #define N_ALL_OUTPUT N_OUTPUT_LOWAT #define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR | N_OVERRUN_ERROR) #define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK | \ N_PARITY_ERROR | N_FRAMING_ERROR | \ N_OVERRUN_ERROR | N_DDCD | N_DCTS) #define SER_DIVISOR(_x, clk) (((clk) + (_x) * 8) / ((_x) * 16)) #define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div)) /* Some masks */ #define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \ | UART_LCR_WLEN7 | UART_LCR_WLEN8) #define LCR_MASK_STOP_BITS (UART_LCR_STOP) #define PENDING(_p) (readl(&(_p)->ip_mem->sio_ir.raw) & _p->ip_ienb) #define READ_SIO_IR(_p) readl(&(_p)->ip_mem->sio_ir.raw) /* Default to 4k buffers */ #ifdef IOC4_1K_BUFFERS #define RING_BUF_SIZE 1024 #define IOC4_BUF_SIZE_BIT 0 #define PROD_CONS_MASK IOC4_PROD_CONS_PTR_1K #else #define RING_BUF_SIZE 4096 #define IOC4_BUF_SIZE_BIT IOC4_SBBR_L_SIZE #define PROD_CONS_MASK IOC4_PROD_CONS_PTR_4K #endif #define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4) /* * This is the entry saved by the driver - one per card */ #define UART_PORT_MIN 0 #define UART_PORT_RS232 UART_PORT_MIN #define UART_PORT_RS422 1 #define UART_PORT_COUNT 2 /* one for each mode */ struct ioc4_control { int ic_irq; struct { /* uart ports are allocated here - 1 for rs232, 1 for rs422 */ struct uart_port icp_uart_port[UART_PORT_COUNT]; /* Handy reference material */ struct ioc4_port *icp_port; } ic_port[IOC4_NUM_SERIAL_PORTS]; struct ioc4_soft *ic_soft; }; /* * per-IOC4 data structure */ #define MAX_IOC4_INTR_ENTS (8 * sizeof(uint32_t)) struct ioc4_soft { struct ioc4_misc_regs __iomem *is_ioc4_misc_addr; struct ioc4_serial __iomem *is_ioc4_serial_addr; /* Each interrupt type has an entry in the array */ struct ioc4_intr_type { /* * Each in-use entry in this array contains at least * one nonzero bit in sd_bits; no two entries in this * array have overlapping sd_bits values. */ struct ioc4_intr_info { uint32_t sd_bits; ioc4_intr_func_f *sd_intr; void *sd_info; } is_intr_info[MAX_IOC4_INTR_ENTS]; /* Number of entries active in the above array */ atomic_t is_num_intrs; } is_intr_type[IOC4_NUM_INTR_TYPES]; /* is_ir_lock must be held while * modifying sio_ie values, so * we can be sure that sio_ie is * not changing when we read it * along with sio_ir. */ spinlock_t is_ir_lock; /* SIO_IE[SC] mod lock */ }; /* Local port info for each IOC4 serial ports */ struct ioc4_port { struct uart_port *ip_port; /* current active port ptr */ /* Ptrs for all ports */ struct uart_port *ip_all_ports[UART_PORT_COUNT]; /* Back ptrs for this port */ struct ioc4_control *ip_control; struct pci_dev *ip_pdev; struct ioc4_soft *ip_ioc4_soft; /* pci mem addresses */ struct ioc4_misc_regs __iomem *ip_mem; struct ioc4_serial __iomem *ip_serial; struct ioc4_serialregs __iomem *ip_serial_regs; struct ioc4_uartregs __iomem *ip_uart_regs; /* Ring buffer page for this port */ dma_addr_t ip_dma_ringbuf; /* vaddr of ring buffer */ struct ring_buffer *ip_cpu_ringbuf; /* Rings for this port */ struct ring *ip_inring; struct ring *ip_outring; /* Hook to port specific values */ struct hooks *ip_hooks; spinlock_t ip_lock; /* Various rx/tx parameters */ int ip_baud; int ip_tx_lowat; int ip_rx_timeout; /* Copy of notification bits */ int ip_notify; /* Shadow copies of various registers so we don't need to PIO * read them constantly */ uint32_t ip_ienb; /* Enabled interrupts */ uint32_t ip_sscr; uint32_t ip_tx_prod; uint32_t ip_rx_cons; int ip_pci_bus_speed; unsigned char ip_flags; }; /* tx low water mark. We need to notify the driver whenever tx is getting * close to empty so it can refill the tx buffer and keep things going. * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll * have no trouble getting in more chars in time (I certainly hope so). */ #define TX_LOWAT_LATENCY 1000 #define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY) #define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ) /* Flags per port */ #define INPUT_HIGH 0x01 #define DCD_ON 0x02 #define LOWAT_WRITTEN 0x04 #define READ_ABORTED 0x08 #define PORT_ACTIVE 0x10 #define PORT_INACTIVE 0 /* This is the value when "off" */ /* Since each port has different register offsets and bitmasks * for everything, we'll store those that we need in tables so we * don't have to be constantly checking the port we are dealing with. */ struct hooks { uint32_t intr_delta_dcd; uint32_t intr_delta_cts; uint32_t intr_tx_mt; uint32_t intr_rx_timer; uint32_t intr_rx_high; uint32_t intr_tx_explicit; uint32_t intr_dma_error; uint32_t intr_clear; uint32_t intr_all; int rs422_select_pin; }; static struct hooks hooks_array[IOC4_NUM_SERIAL_PORTS] = { /* Values for port 0 */ { IOC4_SIO_IR_S0_DELTA_DCD, IOC4_SIO_IR_S0_DELTA_CTS, IOC4_SIO_IR_S0_TX_MT, IOC4_SIO_IR_S0_RX_TIMER, IOC4_SIO_IR_S0_RX_HIGH, IOC4_SIO_IR_S0_TX_EXPLICIT, IOC4_OTHER_IR_S0_MEMERR, (IOC4_SIO_IR_S0_TX_MT | IOC4_SIO_IR_S0_RX_FULL | IOC4_SIO_IR_S0_RX_HIGH | IOC4_SIO_IR_S0_RX_TIMER | IOC4_SIO_IR_S0_DELTA_DCD | IOC4_SIO_IR_S0_DELTA_CTS | IOC4_SIO_IR_S0_INT | IOC4_SIO_IR_S0_TX_EXPLICIT), IOC4_SIO_IR_S0, IOC4_GPPR_UART0_MODESEL_PIN, }, /* Values for port 1 */ { IOC4_SIO_IR_S1_DELTA_DCD, IOC4_SIO_IR_S1_DELTA_CTS, IOC4_SIO_IR_S1_TX_MT, IOC4_SIO_IR_S1_RX_TIMER, IOC4_SIO_IR_S1_RX_HIGH, IOC4_SIO_IR_S1_TX_EXPLICIT, IOC4_OTHER_IR_S1_MEMERR, (IOC4_SIO_IR_S1_TX_MT | IOC4_SIO_IR_S1_RX_FULL | IOC4_SIO_IR_S1_RX_HIGH | IOC4_SIO_IR_S1_RX_TIMER | IOC4_SIO_IR_S1_DELTA_DCD | IOC4_SIO_IR_S1_DELTA_CTS | IOC4_SIO_IR_S1_INT | IOC4_SIO_IR_S1_TX_EXPLICIT), IOC4_SIO_IR_S1, IOC4_GPPR_UART1_MODESEL_PIN, }, /* Values for port 2 */ { IOC4_SIO_IR_S2_DELTA_DCD, IOC4_SIO_IR_S2_DELTA_CTS, IOC4_SIO_IR_S2_TX_MT, IOC4_SIO_IR_S2_RX_TIMER, IOC4_SIO_IR_S2_RX_HIGH, IOC4_SIO_IR_S2_TX_EXPLICIT, IOC4_OTHER_IR_S2_MEMERR, (IOC4_SIO_IR_S2_TX_MT | IOC4_SIO_IR_S2_RX_FULL | IOC4_SIO_IR_S2_RX_HIGH | IOC4_SIO_IR_S2_RX_TIMER | IOC4_SIO_IR_S2_DELTA_DCD | IOC4_SIO_IR_S2_DELTA_CTS | IOC4_SIO_IR_S2_INT | IOC4_SIO_IR_S2_TX_EXPLICIT), IOC4_SIO_IR_S2, IOC4_GPPR_UART2_MODESEL_PIN, }, /* Values for port 3 */ { IOC4_SIO_IR_S3_DELTA_DCD, IOC4_SIO_IR_S3_DELTA_CTS, IOC4_SIO_IR_S3_TX_MT, IOC4_SIO_IR_S3_RX_TIMER, IOC4_SIO_IR_S3_RX_HIGH, IOC4_SIO_IR_S3_TX_EXPLICIT, IOC4_OTHER_IR_S3_MEMERR, (IOC4_SIO_IR_S3_TX_MT | IOC4_SIO_IR_S3_RX_FULL | IOC4_SIO_IR_S3_RX_HIGH | IOC4_SIO_IR_S3_RX_TIMER | IOC4_SIO_IR_S3_DELTA_DCD | IOC4_SIO_IR_S3_DELTA_CTS | IOC4_SIO_IR_S3_INT | IOC4_SIO_IR_S3_TX_EXPLICIT), IOC4_SIO_IR_S3, IOC4_GPPR_UART3_MODESEL_PIN, } }; /* A ring buffer entry */ struct ring_entry { union { struct { uint32_t alldata; uint32_t allsc; } all; struct { char data[4]; /* data bytes */ char sc[4]; /* status/control */ } s; } u; }; /* Test the valid bits in any of the 4 sc chars using "allsc" member */ #define RING_ANY_VALID \ ((uint32_t)(IOC4_RXSB_MODEM_VALID | IOC4_RXSB_DATA_VALID) * 0x01010101) #define ring_sc u.s.sc #define ring_data u.s.data #define ring_allsc u.all.allsc /* Number of entries per ring buffer. */ #define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry)) /* An individual ring */ struct ring { struct ring_entry entries[ENTRIES_PER_RING]; }; /* The whole enchilada */ struct ring_buffer { struct ring TX_0_OR_2; struct ring RX_0_OR_2; struct ring TX_1_OR_3; struct ring RX_1_OR_3; }; /* Get a ring from a port struct */ #define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh) /* Infinite loop detection. */ #define MAXITER 10000000 /* Prototypes */ static void receive_chars(struct uart_port *); static void handle_intr(void *arg, uint32_t sio_ir); /* * port_is_active - determines if this port is currently active * @port: ptr to soft struct for this port * @uart_port: uart port to test for */ static inline int port_is_active(struct ioc4_port *port, struct uart_port *uart_port) { if (port) { if ((port->ip_flags & PORT_ACTIVE) && (port->ip_port == uart_port)) return 1; } return 0; } /** * write_ireg - write the interrupt regs * @ioc4_soft: ptr to soft struct for this port * @val: value to write * @which: which register * @type: which ireg set */ static inline void write_ireg(struct ioc4_soft *ioc4_soft, uint32_t val, int which, int type) { struct ioc4_misc_regs __iomem *mem = ioc4_soft->is_ioc4_misc_addr; unsigned long flags; spin_lock_irqsave(&ioc4_soft->is_ir_lock, flags); switch (type) { case IOC4_SIO_INTR_TYPE: switch (which) { case IOC4_W_IES: writel(val, &mem->sio_ies.raw); break; case IOC4_W_IEC: writel(val, &mem->sio_iec.raw); break; } break; case IOC4_OTHER_INTR_TYPE: switch (which) { case IOC4_W_IES: writel(val, &mem->other_ies.raw); break; case IOC4_W_IEC: writel(val, &mem->other_iec.raw); break; } break; default: break; } spin_unlock_irqrestore(&ioc4_soft->is_ir_lock, flags); } /** * set_baud - Baud rate setting code * @port: port to set * @baud: baud rate to use */ static int set_baud(struct ioc4_port *port, int baud) { int actual_baud; int diff; int lcr; unsigned short divisor; struct ioc4_uartregs __iomem *uart; divisor = SER_DIVISOR(baud, port->ip_pci_bus_speed); if (!divisor) return 1; actual_baud = DIVISOR_TO_BAUD(divisor, port->ip_pci_bus_speed); diff = actual_baud - baud; if (diff < 0) diff = -diff; /* If we're within 1%, we've found a match */ if (diff * 100 > actual_baud) return 1; uart = port->ip_uart_regs; lcr = readb(&uart->i4u_lcr); writeb(lcr | UART_LCR_DLAB, &uart->i4u_lcr); writeb((unsigned char)divisor, &uart->i4u_dll); writeb((unsigned char)(divisor >> 8), &uart->i4u_dlm); writeb(lcr, &uart->i4u_lcr); return 0; } /** * get_ioc4_port - given a uart port, return the control structure * @port: uart port * @set: set this port as current */ static struct ioc4_port *get_ioc4_port(struct uart_port *the_port, int set) { struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev); struct ioc4_control *control = idd->idd_serial_data; struct ioc4_port *port; int port_num, port_type; if (control) { for ( port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++ ) { port = control->ic_port[port_num].icp_port; if (!port) continue; for (port_type = UART_PORT_MIN; port_type < UART_PORT_COUNT; port_type++) { if (the_port == port->ip_all_ports [port_type]) { /* set local copy */ if (set) { port->ip_port = the_port; } return port; } } } } return NULL; } /* The IOC4 hardware provides no atomic way to determine if interrupts * are pending since two reads are required to do so. The handler must * read the SIO_IR and the SIO_IES, and take the logical and of the * two. When this value is zero, all interrupts have been serviced and * the handler may return. * * This has the unfortunate "hole" that, if some other CPU or * some other thread or some higher level interrupt manages to * modify SIO_IE between our reads of SIO_IR and SIO_IE, we may * think we have observed SIO_IR&SIO_IE==0 when in fact this * condition never really occurred. * * To solve this, we use a simple spinlock that must be held * whenever modifying SIO_IE; holding this lock while observing * both SIO_IR and SIO_IE guarantees that we do not falsely * conclude that no enabled interrupts are pending. */ static inline uint32_t pending_intrs(struct ioc4_soft *soft, int type) { struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr; unsigned long flag; uint32_t intrs = 0; BUG_ON(!((type == IOC4_SIO_INTR_TYPE) || (type == IOC4_OTHER_INTR_TYPE))); spin_lock_irqsave(&soft->is_ir_lock, flag); switch (type) { case IOC4_SIO_INTR_TYPE: intrs = readl(&mem->sio_ir.raw) & readl(&mem->sio_ies.raw); break; case IOC4_OTHER_INTR_TYPE: intrs = readl(&mem->other_ir.raw) & readl(&mem->other_ies.raw); /* Don't process any ATA interrupte */ intrs &= ~(IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR); break; default: break; } spin_unlock_irqrestore(&soft->is_ir_lock, flag); return intrs; } /** * port_init - Initialize the sio and ioc4 hardware for a given port * called per port from attach... * @port: port to initialize */ static inline int port_init(struct ioc4_port *port) { uint32_t sio_cr; struct hooks *hooks = port->ip_hooks; struct ioc4_uartregs __iomem *uart; /* Idle the IOC4 serial interface */ writel(IOC4_SSCR_RESET, &port->ip_serial_regs->sscr); /* Wait until any pending bus activity for this port has ceased */ do sio_cr = readl(&port->ip_mem->sio_cr.raw); while (!(sio_cr & IOC4_SIO_CR_SIO_DIAG_IDLE)); /* Finish reset sequence */ writel(0, &port->ip_serial_regs->sscr); /* Once RESET is done, reload cached tx_prod and rx_cons values * and set rings to empty by making prod == cons */ port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK; writel(port->ip_tx_prod, &port->ip_serial_regs->stpir); port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir); /* Disable interrupts for this 16550 */ uart = port->ip_uart_regs; writeb(0, &uart->i4u_lcr); writeb(0, &uart->i4u_ier); /* Set the default baud */ set_baud(port, port->ip_baud); /* Set line control to 8 bits no parity */ writeb(UART_LCR_WLEN8 | 0, &uart->i4u_lcr); /* UART_LCR_STOP == 1 stop */ /* Enable the FIFOs */ writeb(UART_FCR_ENABLE_FIFO, &uart->i4u_fcr); /* then reset 16550 FIFOs */ writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT, &uart->i4u_fcr); /* Clear modem control register */ writeb(0, &uart->i4u_mcr); /* Clear deltas in modem status register */ readb(&uart->i4u_msr); /* Only do this once per port pair */ if (port->ip_hooks == &hooks_array[0] || port->ip_hooks == &hooks_array[2]) { unsigned long ring_pci_addr; uint32_t __iomem *sbbr_l; uint32_t __iomem *sbbr_h; if (port->ip_hooks == &hooks_array[0]) { sbbr_l = &port->ip_serial->sbbr01_l; sbbr_h = &port->ip_serial->sbbr01_h; } else { sbbr_l = &port->ip_serial->sbbr23_l; sbbr_h = &port->ip_serial->sbbr23_h; } ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf; DPRINT_CONFIG(("%s: ring_pci_addr 0x%lx\n", __func__, ring_pci_addr)); writel((unsigned int)((uint64_t)ring_pci_addr >> 32), sbbr_h); writel((unsigned int)ring_pci_addr | IOC4_BUF_SIZE_BIT, sbbr_l); } /* Set the receive timeout value to 10 msec */ writel(IOC4_SRTR_HZ / 100, &port->ip_serial_regs->srtr); /* Set rx threshold, enable DMA */ /* Set high water mark at 3/4 of full ring */ port->ip_sscr = (ENTRIES_PER_RING * 3 / 4); writel(port->ip_sscr, &port->ip_serial_regs->sscr); /* Disable and clear all serial related interrupt bits */ write_ireg(port->ip_ioc4_soft, hooks->intr_clear, IOC4_W_IEC, IOC4_SIO_INTR_TYPE); port->ip_ienb &= ~hooks->intr_clear; writel(hooks->intr_clear, &port->ip_mem->sio_ir.raw); return 0; } /** * handle_dma_error_intr - service any pending DMA error interrupts for the * given port - 2nd level called via sd_intr * @arg: handler arg * @other_ir: ioc4regs */ static void handle_dma_error_intr(void *arg, uint32_t other_ir) { struct ioc4_port *port = (struct ioc4_port *)arg; struct hooks *hooks = port->ip_hooks; unsigned long flags; spin_lock_irqsave(&port->ip_lock, flags); /* ACK the interrupt */ writel(hooks->intr_dma_error, &port->ip_mem->other_ir.raw); if (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_VLD) { printk(KERN_ERR "PCI error address is 0x%llx, " "master is serial port %c %s\n", (((uint64_t)readl(&port->ip_mem->pci_err_addr_h) << 32) | readl(&port->ip_mem->pci_err_addr_l.raw)) & IOC4_PCI_ERR_ADDR_ADDR_MSK, '1' + ((char)(readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_MST_NUM_MSK) >> 1), (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_MST_TYP_MSK) ? "RX" : "TX"); if (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_MUL_ERR) { printk(KERN_ERR "Multiple errors occurred\n"); } } spin_unlock_irqrestore(&port->ip_lock, flags); /* Re-enable DMA error interrupts */ write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IES, IOC4_OTHER_INTR_TYPE); } /** * intr_connect - interrupt connect function * @soft: soft struct for this card * @type: interrupt type * @intrbits: bit pattern to set * @intr: handler function * @info: handler arg */ static void intr_connect(struct ioc4_soft *soft, int type, uint32_t intrbits, ioc4_intr_func_f * intr, void *info) { int i; struct ioc4_intr_info *intr_ptr; BUG_ON(!((type == IOC4_SIO_INTR_TYPE) || (type == IOC4_OTHER_INTR_TYPE))); i = atomic_inc_return(&soft-> is_intr_type[type].is_num_intrs) - 1; BUG_ON(!(i < MAX_IOC4_INTR_ENTS || (printk("i %d\n", i), 0))); /* Save off the lower level interrupt handler */ intr_ptr = &soft->is_intr_type[type].is_intr_info[i]; intr_ptr->sd_bits = intrbits; intr_ptr->sd_intr = intr; intr_ptr->sd_info = info; } /** * ioc4_intr - Top level IOC4 interrupt handler. * @irq: irq value * @arg: handler arg */ static irqreturn_t ioc4_intr(int irq, void *arg) { struct ioc4_soft *soft; uint32_t this_ir, this_mir; int xx, num_intrs = 0; int intr_type; int handled = 0; struct ioc4_intr_info *intr_info; soft = arg; for (intr_type = 0; intr_type < IOC4_NUM_INTR_TYPES; intr_type++) { num_intrs = (int)atomic_read( &soft->is_intr_type[intr_type].is_num_intrs); this_mir = this_ir = pending_intrs(soft, intr_type); /* Farm out the interrupt to the various drivers depending on * which interrupt bits are set. */ for (xx = 0; xx < num_intrs; xx++) { intr_info = &soft->is_intr_type[intr_type].is_intr_info[xx]; this_mir = this_ir & intr_info->sd_bits; if (this_mir) { /* Disable owned interrupts, call handler */ handled++; write_ireg(soft, intr_info->sd_bits, IOC4_W_IEC, intr_type); intr_info->sd_intr(intr_info->sd_info, this_mir); this_ir &= ~this_mir; } } } #ifdef DEBUG_INTERRUPTS { struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr; unsigned long flag; spin_lock_irqsave(&soft->is_ir_lock, flag); printk ("%s : %d : mem 0x%p sio_ir 0x%x sio_ies 0x%x " "other_ir 0x%x other_ies 0x%x mask 0x%x\n", __func__, __LINE__, (void *)mem, readl(&mem->sio_ir.raw), readl(&mem->sio_ies.raw), readl(&mem->other_ir.raw), readl(&mem->other_ies.raw), IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR); spin_unlock_irqrestore(&soft->is_ir_lock, flag); } #endif return handled ? IRQ_HANDLED : IRQ_NONE; } /** * ioc4_attach_local - Device initialization. * Called at *_attach() time for each * IOC4 with serial ports in the system. * @idd: Master module data for this IOC4 */ static inline int ioc4_attach_local(struct ioc4_driver_data *idd) { struct ioc4_port *port; struct ioc4_port *ports[IOC4_NUM_SERIAL_PORTS]; int port_number; uint16_t ioc4_revid_min = 62; uint16_t ioc4_revid; struct pci_dev *pdev = idd->idd_pdev; struct ioc4_control* control = idd->idd_serial_data; struct ioc4_soft *soft = control->ic_soft; void __iomem *ioc4_misc = idd->idd_misc_regs; void __iomem *ioc4_serial = soft->is_ioc4_serial_addr; /* IOC4 firmware must be at least rev 62 */ pci_read_config_word(pdev, PCI_COMMAND_SPECIAL, &ioc4_revid); printk(KERN_INFO "IOC4 firmware revision %d\n", ioc4_revid); if (ioc4_revid < ioc4_revid_min) { printk(KERN_WARNING "IOC4 serial not supported on firmware rev %d, " "please upgrade to rev %d or higher\n", ioc4_revid, ioc4_revid_min); return -EPERM; } BUG_ON(ioc4_misc == NULL); BUG_ON(ioc4_serial == NULL); /* Create port structures for each port */ for (port_number = 0; port_number < IOC4_NUM_SERIAL_PORTS; port_number++) { port = kzalloc(sizeof(struct ioc4_port), GFP_KERNEL); if (!port) { printk(KERN_WARNING "IOC4 serial memory not available for port\n"); goto free; } spin_lock_init(&port->ip_lock); /* we need to remember the previous ones, to point back to * them farther down - setting up the ring buffers. */ ports[port_number] = port; /* Allocate buffers and jumpstart the hardware. */ control->ic_port[port_number].icp_port = port; port->ip_ioc4_soft = soft; port->ip_pdev = pdev; port->ip_ienb = 0; /* Use baud rate calculations based on detected PCI * bus speed. Simply test whether the PCI clock is * running closer to 66MHz or 33MHz. */ if (idd->count_period/IOC4_EXTINT_COUNT_DIVISOR < 20) { port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_66; } else { port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_33; } port->ip_baud = 9600; port->ip_control = control; port->ip_mem = ioc4_misc; port->ip_serial = ioc4_serial; /* point to the right hook */ port->ip_hooks = &hooks_array[port_number]; /* Get direct hooks to the serial regs and uart regs * for this port */ switch (port_number) { case 0: port->ip_serial_regs = &(port->ip_serial->port_0); port->ip_uart_regs = &(port->ip_serial->uart_0); break; case 1: port->ip_serial_regs = &(port->ip_serial->port_1); port->ip_uart_regs = &(port->ip_serial->uart_1); break; case 2: port->ip_serial_regs = &(port->ip_serial->port_2); port->ip_uart_regs = &(port->ip_serial->uart_2); break; default: case 3: port->ip_serial_regs = &(port->ip_serial->port_3); port->ip_uart_regs = &(port->ip_serial->uart_3); break; } /* ring buffers are 1 to a pair of ports */ if (port_number && (port_number & 1)) { /* odd use the evens buffer */ port->ip_dma_ringbuf = ports[port_number - 1]->ip_dma_ringbuf; port->ip_cpu_ringbuf = ports[port_number - 1]->ip_cpu_ringbuf; port->ip_inring = RING(port, RX_1_OR_3); port->ip_outring = RING(port, TX_1_OR_3); } else { if (port->ip_dma_ringbuf == 0) { port->ip_cpu_ringbuf = pci_alloc_consistent (pdev, TOTAL_RING_BUF_SIZE, &port->ip_dma_ringbuf); } BUG_ON(!((((int64_t)port->ip_dma_ringbuf) & (TOTAL_RING_BUF_SIZE - 1)) == 0)); DPRINT_CONFIG(("%s : ip_cpu_ringbuf 0x%p " "ip_dma_ringbuf 0x%p\n", __func__, (void *)port->ip_cpu_ringbuf, (void *)port->ip_dma_ringbuf)); port->ip_inring = RING(port, RX_0_OR_2); port->ip_outring = RING(port, TX_0_OR_2); } DPRINT_CONFIG(("%s : port %d [addr 0x%p] control 0x%p", __func__, port_number, (void *)port, (void *)control)); DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n", (void *)port->ip_serial_regs, (void *)port->ip_uart_regs)); /* Initialize the hardware for IOC4 */ port_init(port); DPRINT_CONFIG(("%s: port_number %d port 0x%p inring 0x%p " "outring 0x%p\n", __func__, port_number, (void *)port, (void *)port->ip_inring, (void *)port->ip_outring)); /* Attach interrupt handlers */ intr_connect(soft, IOC4_SIO_INTR_TYPE, GET_SIO_IR(port_number), handle_intr, port); intr_connect(soft, IOC4_OTHER_INTR_TYPE, GET_OTHER_IR(port_number), handle_dma_error_intr, port); } return 0; free: while (port_number) kfree(ports[--port_number]); return -ENOMEM; } /** * enable_intrs - enable interrupts * @port: port to enable * @mask: mask to use */ static void enable_intrs(struct ioc4_port *port, uint32_t mask) { struct hooks *hooks = port->ip_hooks; if ((port->ip_ienb & mask) != mask) { write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IES, IOC4_SIO_INTR_TYPE); port->ip_ienb |= mask; } if (port->ip_ienb) write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IES, IOC4_OTHER_INTR_TYPE); } /** * local_open - local open a port * @port: port to open */ static inline int local_open(struct ioc4_port *port) { int spiniter = 0; port->ip_flags = PORT_ACTIVE; /* Pause the DMA interface if necessary */ if (port->ip_sscr & IOC4_SSCR_DMA_EN) { writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE, &port->ip_serial_regs->sscr); while((readl(&port->ip_serial_regs-> sscr) & IOC4_SSCR_PAUSE_STATE) == 0) { spiniter++; if (spiniter > MAXITER) { port->ip_flags = PORT_INACTIVE; return -1; } } } /* Reset the input fifo. If the uart received chars while the port * was closed and DMA is not enabled, the uart may have a bunch of * chars hanging around in its rx fifo which will not be discarded * by rclr in the upper layer. We must get rid of them here. */ writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR, &port->ip_uart_regs->i4u_fcr); writeb(UART_LCR_WLEN8, &port->ip_uart_regs->i4u_lcr); /* UART_LCR_STOP == 1 stop */ /* Re-enable DMA, set default threshold to intr whenever there is * data available. */ port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD; port->ip_sscr |= 1; /* default threshold */ /* Plug in the new sscr. This implicitly clears the DMA_PAUSE * flag if it was set above */ writel(port->ip_sscr, &port->ip_serial_regs->sscr); port->ip_tx_lowat = 1; return 0; } /** * set_rx_timeout - Set rx timeout and threshold values. * @port: port to use * @timeout: timeout value in ticks */ static inline int set_rx_timeout(struct ioc4_port *port, int timeout) { int threshold; port->ip_rx_timeout = timeout; /* Timeout is in ticks. Let's figure out how many chars we * can receive at the current baud rate in that interval * and set the rx threshold to that amount. There are 4 chars * per ring entry, so we'll divide the number of chars that will * arrive in timeout by 4. * So .... timeout * baud / 10 / HZ / 4, with HZ = 100. */ threshold = timeout * port->ip_baud / 4000; if (threshold == 0) threshold = 1; /* otherwise we'll intr all the time! */ if ((unsigned)threshold > (unsigned)IOC4_SSCR_RX_THRESHOLD) return 1; port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD; port->ip_sscr |= threshold; writel(port->ip_sscr, &port->ip_serial_regs->sscr); /* Now set the rx timeout to the given value * again timeout * IOC4_SRTR_HZ / HZ */ timeout = timeout * IOC4_SRTR_HZ / 100; if (timeout > IOC4_SRTR_CNT) timeout = IOC4_SRTR_CNT; writel(timeout, &port->ip_serial_regs->srtr); return 0; } /** * config_port - config the hardware * @port: port to config * @baud: baud rate for the port * @byte_size: data size * @stop_bits: number of stop bits * @parenb: parity enable ? * @parodd: odd parity ? */ static inline int config_port(struct ioc4_port *port, int baud, int byte_size, int stop_bits, int parenb, int parodd) { char lcr, sizebits; int spiniter = 0; DPRINT_CONFIG(("%s: baud %d byte_size %d stop %d parenb %d parodd %d\n", __func__, baud, byte_size, stop_bits, parenb, parodd)); if (set_baud(port, baud)) return 1; switch (byte_size) { case 5: sizebits = UART_LCR_WLEN5; break; case 6: sizebits = UART_LCR_WLEN6; break; case 7: sizebits = UART_LCR_WLEN7; break; case 8: sizebits = UART_LCR_WLEN8; break; default: return 1; } /* Pause the DMA interface if necessary */ if (port->ip_sscr & IOC4_SSCR_DMA_EN) { writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE, &port->ip_serial_regs->sscr); while((readl(&port->ip_serial_regs->sscr) & IOC4_SSCR_PAUSE_STATE) == 0) { spiniter++; if (spiniter > MAXITER) return -1; } } /* Clear relevant fields in lcr */ lcr = readb(&port->ip_uart_regs->i4u_lcr); lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR | UART_LCR_PARITY | LCR_MASK_STOP_BITS); /* Set byte size in lcr */ lcr |= sizebits; /* Set parity */ if (parenb) { lcr |= UART_LCR_PARITY; if (!parodd) lcr |= UART_LCR_EPAR; } /* Set stop bits */ if (stop_bits) lcr |= UART_LCR_STOP /* 2 stop bits */ ; writeb(lcr, &port->ip_uart_regs->i4u_lcr); /* Re-enable the DMA interface if necessary */ if (port->ip_sscr & IOC4_SSCR_DMA_EN) { writel(port->ip_sscr, &port->ip_serial_regs->sscr); } port->ip_baud = baud; /* When we get within this number of ring entries of filling the * entire ring on tx, place an EXPLICIT intr to generate a lowat * notification when output has drained. */ port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4; if (port->ip_tx_lowat == 0) port->ip_tx_lowat = 1; set_rx_timeout(port, 2); return 0; } /** * do_write - Write bytes to the port. Returns the number of bytes * actually written. Called from transmit_chars * @port: port to use * @buf: the stuff to write * @len: how many bytes in 'buf' */ static inline int do_write(struct ioc4_port *port, char *buf, int len) { int prod_ptr, cons_ptr, total = 0; struct ring *outring; struct ring_entry *entry; struct hooks *hooks = port->ip_hooks; BUG_ON(!(len >= 0)); prod_ptr = port->ip_tx_prod; cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK; outring = port->ip_outring; /* Maintain a 1-entry red-zone. The ring buffer is full when * (cons - prod) % ring_size is 1. Rather than do this subtraction * in the body of the loop, I'll do it now. */ cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK; /* Stuff the bytes into the output */ while ((prod_ptr != cons_ptr) && (len > 0)) { int xx; /* Get 4 bytes (one ring entry) at a time */ entry = (struct ring_entry *)((caddr_t) outring + prod_ptr); /* Invalidate all entries */ entry->ring_allsc = 0; /* Copy in some bytes */ for (xx = 0; (xx < 4) && (len > 0); xx++) { entry->ring_data[xx] = *buf++; entry->ring_sc[xx] = IOC4_TXCB_VALID; len--; total++; } /* If we are within some small threshold of filling up the * entire ring buffer, we must place an EXPLICIT intr here * to generate a lowat interrupt in case we subsequently * really do fill up the ring and the caller goes to sleep. * No need to place more than one though. */ if (!(port->ip_flags & LOWAT_WRITTEN) && ((cons_ptr - prod_ptr) & PROD_CONS_MASK) <= port->ip_tx_lowat * (int)sizeof(struct ring_entry)) { port->ip_flags |= LOWAT_WRITTEN; entry->ring_sc[0] |= IOC4_TXCB_INT_WHEN_DONE; } /* Go on to next entry */ prod_ptr += sizeof(struct ring_entry); prod_ptr &= PROD_CONS_MASK; } /* If we sent something, start DMA if necessary */ if (total > 0 && !(port->ip_sscr & IOC4_SSCR_DMA_EN)) { port->ip_sscr |= IOC4_SSCR_DMA_EN; writel(port->ip_sscr, &port->ip_serial_regs->sscr); } /* Store the new producer pointer. If tx is disabled, we stuff the * data into the ring buffer, but we don't actually start tx. */ if (!uart_tx_stopped(port->ip_port)) { writel(prod_ptr, &port->ip_serial_regs->stpir); /* If we are now transmitting, enable tx_mt interrupt so we * can disable DMA if necessary when the tx finishes. */ if (total > 0) enable_intrs(port, hooks->intr_tx_mt); } port->ip_tx_prod = prod_ptr; return total; } /** * disable_intrs - disable interrupts * @port: port to enable * @mask: mask to use */ static void disable_intrs(struct ioc4_port *port, uint32_t mask) { struct hooks *hooks = port->ip_hooks; if (port->ip_ienb & mask) { write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IEC, IOC4_SIO_INTR_TYPE); port->ip_ienb &= ~mask; } if (!port->ip_ienb) write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IEC, IOC4_OTHER_INTR_TYPE); } /** * set_notification - Modify event notification * @port: port to use * @mask: events mask * @set_on: set ? */ static int set_notification(struct ioc4_port *port, int mask, int set_on) { struct hooks *hooks = port->ip_hooks; uint32_t intrbits, sscrbits; BUG_ON(!mask); intrbits = sscrbits = 0; if (mask & N_DATA_READY) intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high); if (mask & N_OUTPUT_LOWAT) intrbits |= hooks->intr_tx_explicit; if (mask & N_DDCD) { intrbits |= hooks->intr_delta_dcd; sscrbits |= IOC4_SSCR_RX_RING_DCD; } if (mask & N_DCTS) intrbits |= hooks->intr_delta_cts; if (set_on) { enable_intrs(port, intrbits); port->ip_notify |= mask; port->ip_sscr |= sscrbits; } else { disable_intrs(port, intrbits); port->ip_notify &= ~mask; port->ip_sscr &= ~sscrbits; } /* We require DMA if either DATA_READY or DDCD notification is * currently requested. If neither of these is requested and * there is currently no tx in progress, DMA may be disabled. */ if (port->ip_notify & (N_DATA_READY | N_DDCD)) port->ip_sscr |= IOC4_SSCR_DMA_EN; else if (!(port->ip_ienb & hooks->intr_tx_mt)) port->ip_sscr &= ~IOC4_SSCR_DMA_EN; writel(port->ip_sscr, &port->ip_serial_regs->sscr); return 0; } /** * set_mcr - set the master control reg * @the_port: port to use * @mask1: mcr mask * @mask2: shadow mask */ static inline int set_mcr(struct uart_port *the_port, int mask1, int mask2) { struct ioc4_port *port = get_ioc4_port(the_port, 0); uint32_t shadow; int spiniter = 0; char mcr; if (!port) return -1; /* Pause the DMA interface if necessary */ if (port->ip_sscr & IOC4_SSCR_DMA_EN) { writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE, &port->ip_serial_regs->sscr); while ((readl(&port->ip_serial_regs->sscr) & IOC4_SSCR_PAUSE_STATE) == 0) { spiniter++; if (spiniter > MAXITER) return -1; } } shadow = readl(&port->ip_serial_regs->shadow); mcr = (shadow & 0xff000000) >> 24; /* Set new value */ mcr |= mask1; shadow |= mask2; writeb(mcr, &port->ip_uart_regs->i4u_mcr); writel(shadow, &port->ip_serial_regs->shadow); /* Re-enable the DMA interface if necessary */ if (port->ip_sscr & IOC4_SSCR_DMA_EN) { writel(port->ip_sscr, &port->ip_serial_regs->sscr); } return 0; } /** * ioc4_set_proto - set the protocol for the port * @port: port to use * @proto: protocol to use */ static int ioc4_set_proto(struct ioc4_port *port, int proto) { struct hooks *hooks = port->ip_hooks; switch (proto) { case PROTO_RS232: /* Clear the appropriate GIO pin */ writel(0, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw)); break; case PROTO_RS422: /* Set the appropriate GIO pin */ writel(1, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw)); break; default: return 1; } return 0; } /** * transmit_chars - upper level write, called with ip_lock * @the_port: port to write */ static void transmit_chars(struct uart_port *the_port) { int xmit_count, tail, head; int result; char *start; struct tty_struct *tty; struct ioc4_port *port = get_ioc4_port(the_port, 0); struct uart_state *state; if (!the_port) return; if (!port) return; state = the_port->state; tty = state->port.tty; if (uart_circ_empty(&state->xmit) || uart_tx_stopped(the_port)) { /* Nothing to do or hw stopped */ set_notification(port, N_ALL_OUTPUT, 0); return; } head = state->xmit.head; tail = state->xmit.tail; start = (char *)&state->xmit.buf[tail]; /* write out all the data or until the end of the buffer */ xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail); if (xmit_count > 0) { result = do_write(port, start, xmit_count); if (result > 0) { /* booking */ xmit_count -= result; the_port->icount.tx += result; /* advance the pointers */ tail += result; tail &= UART_XMIT_SIZE - 1; state->xmit.tail = tail; start = (char *)&state->xmit.buf[tail]; } } if (uart_circ_chars_pending(&state->xmit) < WAKEUP_CHARS) uart_write_wakeup(the_port); if (uart_circ_empty(&state->xmit)) { set_notification(port, N_OUTPUT_LOWAT, 0); } else { set_notification(port, N_OUTPUT_LOWAT, 1); } } /** * ioc4_change_speed - change the speed of the port * @the_port: port to change * @new_termios: new termios settings * @old_termios: old termios settings */ static void ioc4_change_speed(struct uart_port *the_port, struct ktermios *new_termios, struct ktermios *old_termios) { struct ioc4_port *port = get_ioc4_port(the_port, 0); int baud, bits; unsigned cflag, iflag; int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8; struct uart_state *state = the_port->state; cflag = new_termios->c_cflag; iflag = new_termios->c_iflag; switch (cflag & CSIZE) { case CS5: new_data = 5; bits = 7; break; case CS6: new_data = 6; bits = 8; break; case CS7: new_data = 7; bits = 9; break; case CS8: new_data = 8; bits = 10; break; default: /* cuz we always need a default ... */ new_data = 5; bits = 7; break; } if (cflag & CSTOPB) { bits++; new_stop = 1; } if (cflag & PARENB) { bits++; new_parity_enable = 1; if (cflag & PARODD) new_parity = 1; } baud = uart_get_baud_rate(the_port, new_termios, old_termios, MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED); DPRINT_CONFIG(("%s: returned baud %d\n", __func__, baud)); /* default is 9600 */ if (!baud) baud = 9600; if (!the_port->fifosize) the_port->fifosize = IOC4_FIFO_CHARS; the_port->timeout = ((the_port->fifosize * HZ * bits) / (baud / 10)); the_port->timeout += HZ / 50; /* Add .02 seconds of slop */ the_port->ignore_status_mask = N_ALL_INPUT; state->port.low_latency = 1; if (iflag & IGNPAR) the_port->ignore_status_mask &= ~(N_PARITY_ERROR | N_FRAMING_ERROR); if (iflag & IGNBRK) { the_port->ignore_status_mask &= ~N_BREAK; if (iflag & IGNPAR) the_port->ignore_status_mask &= ~N_OVERRUN_ERROR; } if (!(cflag & CREAD)) { /* ignore everything */ the_port->ignore_status_mask &= ~N_DATA_READY; } if (cflag & CRTSCTS) { port->ip_sscr |= IOC4_SSCR_HFC_EN; } else { port->ip_sscr &= ~IOC4_SSCR_HFC_EN; } writel(port->ip_sscr, &port->ip_serial_regs->sscr); /* Set the configuration and proper notification call */ DPRINT_CONFIG(("%s : port 0x%p cflag 0%o " "config_port(baud %d data %d stop %d p enable %d parity %d)," " notification 0x%x\n", __func__, (void *)port, cflag, baud, new_data, new_stop, new_parity_enable, new_parity, the_port->ignore_status_mask)); if ((config_port(port, baud, /* baud */ new_data, /* byte size */ new_stop, /* stop bits */ new_parity_enable, /* set parity */ new_parity)) >= 0) { /* parity 1==odd */ set_notification(port, the_port->ignore_status_mask, 1); } } /** * ic4_startup_local - Start up the serial port - returns >= 0 if no errors * @the_port: Port to operate on */ static inline int ic4_startup_local(struct uart_port *the_port) { struct ioc4_port *port; struct uart_state *state; if (!the_port) return -1; port = get_ioc4_port(the_port, 0); if (!port) return -1; state = the_port->state; local_open(port); /* set the protocol - mapbase has the port type */ ioc4_set_proto(port, the_port->mapbase); /* set the speed of the serial port */ ioc4_change_speed(the_port, &state->port.tty->termios, (struct ktermios *)0); return 0; } /* * ioc4_cb_output_lowat - called when the output low water mark is hit * @the_port: port to output */ static void ioc4_cb_output_lowat(struct uart_port *the_port) { unsigned long pflags; /* ip_lock is set on the call here */ if (the_port) { spin_lock_irqsave(&the_port->lock, pflags); transmit_chars(the_port); spin_unlock_irqrestore(&the_port->lock, pflags); } } /** * handle_intr - service any interrupts for the given port - 2nd level * called via sd_intr * @arg: handler arg * @sio_ir: ioc4regs */ static void handle_intr(void *arg, uint32_t sio_ir) { struct ioc4_port *port = (struct ioc4_port *)arg; struct hooks *hooks = port->ip_hooks; unsigned int rx_high_rd_aborted = 0; unsigned long flags; struct uart_port *the_port; int loop_counter; /* Possible race condition here: The tx_mt interrupt bit may be * cleared without the intervention of the interrupt handler, * e.g. by a write. If the top level interrupt handler reads a * tx_mt, then some other processor does a write, starting up * output, then we come in here, see the tx_mt and stop DMA, the * output started by the other processor will hang. Thus we can * only rely on tx_mt being legitimate if it is read while the * port lock is held. Therefore this bit must be ignored in the * passed in interrupt mask which was read by the top level * interrupt handler since the port lock was not held at the time * it was read. We can only rely on this bit being accurate if it * is read while the port lock is held. So we'll clear it for now, * and reload it later once we have the port lock. */ sio_ir &= ~(hooks->intr_tx_mt); spin_lock_irqsave(&port->ip_lock, flags); loop_counter = MAXITER; /* to avoid hangs */ do { uint32_t shadow; if ( loop_counter-- <= 0 ) { printk(KERN_WARNING "IOC4 serial: " "possible hang condition/" "port stuck on interrupt.\n"); break; } /* Handle a DCD change */ if (sio_ir & hooks->intr_delta_dcd) { /* ACK the interrupt */ writel(hooks->intr_delta_dcd, &port->ip_mem->sio_ir.raw); shadow = readl(&port->ip_serial_regs->shadow); if ((port->ip_notify & N_DDCD) && (shadow & IOC4_SHADOW_DCD) && (port->ip_port)) { the_port = port->ip_port; the_port->icount.dcd = 1; wake_up_interruptible (&the_port->state->port.delta_msr_wait); } else if ((port->ip_notify & N_DDCD) && !(shadow & IOC4_SHADOW_DCD)) { /* Flag delta DCD/no DCD */ port->ip_flags |= DCD_ON; } } /* Handle a CTS change */ if (sio_ir & hooks->intr_delta_cts) { /* ACK the interrupt */ writel(hooks->intr_delta_cts, &port->ip_mem->sio_ir.raw); shadow = readl(&port->ip_serial_regs->shadow); if ((port->ip_notify & N_DCTS) && (port->ip_port)) { the_port = port->ip_port; the_port->icount.cts = (shadow & IOC4_SHADOW_CTS) ? 1 : 0; wake_up_interruptible (&the_port->state->port.delta_msr_wait); } } /* rx timeout interrupt. Must be some data available. Put this * before the check for rx_high since servicing this condition * may cause that condition to clear. */ if (sio_ir & hooks->intr_rx_timer) { /* ACK the interrupt */ writel(hooks->intr_rx_timer, &port->ip_mem->sio_ir.raw); if ((port->ip_notify & N_DATA_READY) && (port->ip_port)) { /* ip_lock is set on call here */ receive_chars(port->ip_port); } } /* rx high interrupt. Must be after rx_timer. */ else if (sio_ir & hooks->intr_rx_high) { /* Data available, notify upper layer */ if ((port->ip_notify & N_DATA_READY) && port->ip_port) { /* ip_lock is set on call here */ receive_chars(port->ip_port); } /* We can't ACK this interrupt. If receive_chars didn't * cause the condition to clear, we'll have to disable * the interrupt until the data is drained. * If the read was aborted, don't disable the interrupt * as this may cause us to hang indefinitely. An * aborted read generally means that this interrupt * hasn't been delivered to the cpu yet anyway, even * though we see it as asserted when we read the sio_ir. */ if ((sio_ir = PENDING(port)) & hooks->intr_rx_high) { if ((port->ip_flags & READ_ABORTED) == 0) { port->ip_ienb &= ~hooks->intr_rx_high; port->ip_flags |= INPUT_HIGH; } else { rx_high_rd_aborted++; } } } /* We got a low water interrupt: notify upper layer to * send more data. Must come before tx_mt since servicing * this condition may cause that condition to clear. */ if (sio_ir & hooks->intr_tx_explicit) { port->ip_flags &= ~LOWAT_WRITTEN; /* ACK the interrupt */ writel(hooks->intr_tx_explicit, &port->ip_mem->sio_ir.raw); if (port->ip_notify & N_OUTPUT_LOWAT) ioc4_cb_output_lowat(port->ip_port); } /* Handle tx_mt. Must come after tx_explicit. */ else if (sio_ir & hooks->intr_tx_mt) { /* If we are expecting a lowat notification * and we get to this point it probably means that for * some reason the tx_explicit didn't work as expected * (that can legitimately happen if the output buffer is * filled up in just the right way). * So send the notification now. */ if (port->ip_notify & N_OUTPUT_LOWAT) { ioc4_cb_output_lowat(port->ip_port); /* We need to reload the sio_ir since the lowat * call may have caused another write to occur, * clearing the tx_mt condition. */ sio_ir = PENDING(port); } /* If the tx_mt condition still persists even after the * lowat call, we've got some work to do. */ if (sio_ir & hooks->intr_tx_mt) { /* If we are not currently expecting DMA input, * and the transmitter has just gone idle, * there is no longer any reason for DMA, so * disable it. */ if (!(port->ip_notify & (N_DATA_READY | N_DDCD))) { BUG_ON(!(port->ip_sscr & IOC4_SSCR_DMA_EN)); port->ip_sscr &= ~IOC4_SSCR_DMA_EN; writel(port->ip_sscr, &port->ip_serial_regs->sscr); } /* Prevent infinite tx_mt interrupt */ port->ip_ienb &= ~hooks->intr_tx_mt; } } sio_ir = PENDING(port); /* if the read was aborted and only hooks->intr_rx_high, * clear hooks->intr_rx_high, so we do not loop forever. */ if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) { sio_ir &= ~hooks->intr_rx_high; } } while (sio_ir & hooks->intr_all); spin_unlock_irqrestore(&port->ip_lock, flags); /* Re-enable interrupts before returning from interrupt handler. * Getting interrupted here is okay. It'll just v() our semaphore, and * we'll come through the loop again. */ write_ireg(port->ip_ioc4_soft, port->ip_ienb, IOC4_W_IES, IOC4_SIO_INTR_TYPE); } /* * ioc4_cb_post_ncs - called for some basic errors * @port: port to use * @ncs: event */ static void ioc4_cb_post_ncs(struct uart_port *the_port, int ncs) { struct uart_icount *icount; icount = &the_port->icount; if (ncs & NCS_BREAK) icount->brk++; if (ncs & NCS_FRAMING) icount->frame++; if (ncs & NCS_OVERRUN) icount->overrun++; if (ncs & NCS_PARITY) icount->parity++; } /** * do_read - Read in bytes from the port. Return the number of bytes * actually read. * @the_port: port to use * @buf: place to put the stuff we read * @len: how big 'buf' is */ static inline int do_read(struct uart_port *the_port, unsigned char *buf, int len) { int prod_ptr, cons_ptr, total; struct ioc4_port *port = get_ioc4_port(the_port, 0); struct ring *inring; struct ring_entry *entry; struct hooks *hooks; int byte_num; char *sc; int loop_counter; BUG_ON(!(len >= 0)); BUG_ON(!port); hooks = port->ip_hooks; /* There is a nasty timing issue in the IOC4. When the rx_timer * expires or the rx_high condition arises, we take an interrupt. * At some point while servicing the interrupt, we read bytes from * the ring buffer and re-arm the rx_timer. However the rx_timer is * not started until the first byte is received *after* it is armed, * and any bytes pending in the rx construction buffers are not drained * to memory until either there are 4 bytes available or the rx_timer * expires. This leads to a potential situation where data is left * in the construction buffers forever - 1 to 3 bytes were received * after the interrupt was generated but before the rx_timer was * re-armed. At that point as long as no subsequent bytes are received * the timer will never be started and the bytes will remain in the * construction buffer forever. The solution is to execute a DRAIN * command after rearming the timer. This way any bytes received before * the DRAIN will be drained to memory, and any bytes received after * the DRAIN will start the TIMER and be drained when it expires. * Luckily, this only needs to be done when the DMA buffer is empty * since there is no requirement that this function return all * available data as long as it returns some. */ /* Re-arm the timer */ writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir); prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; cons_ptr = port->ip_rx_cons; if (prod_ptr == cons_ptr) { int reset_dma = 0; /* Input buffer appears empty, do a flush. */ /* DMA must be enabled for this to work. */ if (!(port->ip_sscr & IOC4_SSCR_DMA_EN)) { port->ip_sscr |= IOC4_SSCR_DMA_EN; reset_dma = 1; } /* Potential race condition: we must reload the srpir after * issuing the drain command, otherwise we could think the rx * buffer is empty, then take a very long interrupt, and when * we come back it's full and we wait forever for the drain to * complete. */ writel(port->ip_sscr | IOC4_SSCR_RX_DRAIN, &port->ip_serial_regs->sscr); prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; /* We must not wait for the DRAIN to complete unless there are * at least 8 bytes (2 ring entries) available to receive the * data otherwise the DRAIN will never complete and we'll * deadlock here. * In fact, to make things easier, I'll just ignore the flush if * there is any data at all now available. */ if (prod_ptr == cons_ptr) { loop_counter = 0; while (readl(&port->ip_serial_regs->sscr) & IOC4_SSCR_RX_DRAIN) { loop_counter++; if (loop_counter > MAXITER) return -1; } /* SIGH. We have to reload the prod_ptr *again* since * the drain may have caused it to change */ prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; } if (reset_dma) { port->ip_sscr &= ~IOC4_SSCR_DMA_EN; writel(port->ip_sscr, &port->ip_serial_regs->sscr); } } inring = port->ip_inring; port->ip_flags &= ~READ_ABORTED; total = 0; loop_counter = 0xfffff; /* to avoid hangs */ /* Grab bytes from the hardware */ while ((prod_ptr != cons_ptr) && (len > 0)) { entry = (struct ring_entry *)((caddr_t)inring + cons_ptr); if ( loop_counter-- <= 0 ) { printk(KERN_WARNING "IOC4 serial: " "possible hang condition/" "port stuck on read.\n"); break; } /* According to the producer pointer, this ring entry * must contain some data. But if the PIO happened faster * than the DMA, the data may not be available yet, so let's * wait until it arrives. */ if ((entry->ring_allsc & RING_ANY_VALID) == 0) { /* Indicate the read is aborted so we don't disable * the interrupt thinking that the consumer is * congested. */ port->ip_flags |= READ_ABORTED; len = 0; break; } /* Load the bytes/status out of the ring entry */ for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) { sc = &(entry->ring_sc[byte_num]); /* Check for change in modem state or overrun */ if ((*sc & IOC4_RXSB_MODEM_VALID) && (port->ip_notify & N_DDCD)) { /* Notify upper layer if DCD dropped */ if ((port->ip_flags & DCD_ON) && !(*sc & IOC4_RXSB_DCD)) { /* If we have already copied some data, * return it. We'll pick up the carrier * drop on the next pass. That way we * don't throw away the data that has * already been copied back to * the caller's buffer. */ if (total > 0) { len = 0; break; } port->ip_flags &= ~DCD_ON; /* Turn off this notification so the * carrier drop protocol won't see it * again when it does a read. */ *sc &= ~IOC4_RXSB_MODEM_VALID; /* To keep things consistent, we need * to update the consumer pointer so * the next reader won't come in and * try to read the same ring entries * again. This must be done here before * the dcd change. */ if ((entry->ring_allsc & RING_ANY_VALID) == 0) { cons_ptr += (int)sizeof (struct ring_entry); cons_ptr &= PROD_CONS_MASK; } writel(cons_ptr, &port->ip_serial_regs->srcir); port->ip_rx_cons = cons_ptr; /* Notify upper layer of carrier drop */ if ((port->ip_notify & N_DDCD) && port->ip_port) { the_port->icount.dcd = 0; wake_up_interruptible (&the_port->state-> port.delta_msr_wait); } /* If we had any data to return, we * would have returned it above. */ return 0; } } if (*sc & IOC4_RXSB_MODEM_VALID) { /* Notify that an input overrun occurred */ if ((*sc & IOC4_RXSB_OVERRUN) && (port->ip_notify & N_OVERRUN_ERROR)) { ioc4_cb_post_ncs(the_port, NCS_OVERRUN); } /* Don't look at this byte again */ *sc &= ~IOC4_RXSB_MODEM_VALID; } /* Check for valid data or RX errors */ if ((*sc & IOC4_RXSB_DATA_VALID) && ((*sc & (IOC4_RXSB_PAR_ERR | IOC4_RXSB_FRAME_ERR | IOC4_RXSB_BREAK)) && (port->ip_notify & (N_PARITY_ERROR | N_FRAMING_ERROR | N_BREAK)))) { /* There is an error condition on the next byte. * If we have already transferred some bytes, * we'll stop here. Otherwise if this is the * first byte to be read, we'll just transfer * it alone after notifying the * upper layer of its status. */ if (total > 0) { len = 0; break; } else { if ((*sc & IOC4_RXSB_PAR_ERR) && (port->ip_notify & N_PARITY_ERROR)) { ioc4_cb_post_ncs(the_port, NCS_PARITY); } if ((*sc & IOC4_RXSB_FRAME_ERR) && (port->ip_notify & N_FRAMING_ERROR)){ ioc4_cb_post_ncs(the_port, NCS_FRAMING); } if ((*sc & IOC4_RXSB_BREAK) && (port->ip_notify & N_BREAK)) { ioc4_cb_post_ncs (the_port, NCS_BREAK); } len = 1; } } if (*sc & IOC4_RXSB_DATA_VALID) { *sc &= ~IOC4_RXSB_DATA_VALID; *buf = entry->ring_data[byte_num]; buf++; len--; total++; } } /* If we used up this entry entirely, go on to the next one, * otherwise we must have run out of buffer space, so * leave the consumer pointer here for the next read in case * there are still unread bytes in this entry. */ if ((entry->ring_allsc & RING_ANY_VALID) == 0) { cons_ptr += (int)sizeof(struct ring_entry); cons_ptr &= PROD_CONS_MASK; } } /* Update consumer pointer and re-arm rx timer interrupt */ writel(cons_ptr, &port->ip_serial_regs->srcir); port->ip_rx_cons = cons_ptr; /* If we have now dipped below the rx high water mark and we have * rx_high interrupt turned off, we can now turn it back on again. */ if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr) & PROD_CONS_MASK) < ((port->ip_sscr & IOC4_SSCR_RX_THRESHOLD) << IOC4_PROD_CONS_PTR_OFF))) { port->ip_flags &= ~INPUT_HIGH; enable_intrs(port, hooks->intr_rx_high); } return total; } /** * receive_chars - upper level read. Called with ip_lock. * @the_port: port to read from */ static void receive_chars(struct uart_port *the_port) { unsigned char ch[IOC4_MAX_CHARS]; int read_count, request_count = IOC4_MAX_CHARS; struct uart_icount *icount; struct uart_state *state = the_port->state; unsigned long pflags; /* Make sure all the pointers are "good" ones */ if (!state) return; spin_lock_irqsave(&the_port->lock, pflags); request_count = tty_buffer_request_room(&state->port, IOC4_MAX_CHARS); if (request_count > 0) { icount = &the_port->icount; read_count = do_read(the_port, ch, request_count); if (read_count > 0) { tty_insert_flip_string(&state->port, ch, read_count); icount->rx += read_count; } } spin_unlock_irqrestore(&the_port->lock, pflags); tty_flip_buffer_push(&state->port); } /** * ic4_type - What type of console are we? * @port: Port to operate with (we ignore since we only have one port) * */ static const char *ic4_type(struct uart_port *the_port) { if (the_port->mapbase == PROTO_RS232) return "SGI IOC4 Serial [rs232]"; else return "SGI IOC4 Serial [rs422]"; } /** * ic4_tx_empty - Is the transmitter empty? * @port: Port to operate on * */ static unsigned int ic4_tx_empty(struct uart_port *the_port) { struct ioc4_port *port = get_ioc4_port(the_port, 0); unsigned int ret = 0; if (port_is_active(port, the_port)) { if (readl(&port->ip_serial_regs->shadow) & IOC4_SHADOW_TEMT) ret = TIOCSER_TEMT; } return ret; } /** * ic4_stop_tx - stop the transmitter * @port: Port to operate on * */ static void ic4_stop_tx(struct uart_port *the_port) { struct ioc4_port *port = get_ioc4_port(the_port, 0); if (port_is_active(port, the_port)) set_notification(port, N_OUTPUT_LOWAT, 0); } /** * null_void_function - * @port: Port to operate on * */ static void null_void_function(struct uart_port *the_port) { } /** * ic4_shutdown - shut down the port - free irq and disable * @port: Port to shut down * */ static void ic4_shutdown(struct uart_port *the_port) { unsigned long port_flags; struct ioc4_port *port; struct uart_state *state; port = get_ioc4_port(the_port, 0); if (!port) return; state = the_port->state; port->ip_port = NULL; wake_up_interruptible(&state->port.delta_msr_wait); if (state->port.tty) set_bit(TTY_IO_ERROR, &state->port.tty->flags); spin_lock_irqsave(&the_port->lock, port_flags); set_notification(port, N_ALL, 0); port->ip_flags = PORT_INACTIVE; spin_unlock_irqrestore(&the_port->lock, port_flags); } /** * ic4_set_mctrl - set control lines (dtr, rts, etc) * @port: Port to operate on * @mctrl: Lines to set/unset * */ static void ic4_set_mctrl(struct uart_port *the_port, unsigned int mctrl) { unsigned char mcr = 0; struct ioc4_port *port; port = get_ioc4_port(the_port, 0); if (!port_is_active(port, the_port)) return; if (mctrl & TIOCM_RTS) mcr |= UART_MCR_RTS; if (mctrl & TIOCM_DTR) mcr |= UART_MCR_DTR; if (mctrl & TIOCM_OUT1) mcr |= UART_MCR_OUT1; if (mctrl & TIOCM_OUT2) mcr |= UART_MCR_OUT2; if (mctrl & TIOCM_LOOP) mcr |= UART_MCR_LOOP; set_mcr(the_port, mcr, IOC4_SHADOW_DTR); } /** * ic4_get_mctrl - get control line info * @port: port to operate on * */ static unsigned int ic4_get_mctrl(struct uart_port *the_port) { struct ioc4_port *port = get_ioc4_port(the_port, 0); uint32_t shadow; unsigned int ret = 0; if (!port_is_active(port, the_port)) return 0; shadow = readl(&port->ip_serial_regs->shadow); if (shadow & IOC4_SHADOW_DCD) ret |= TIOCM_CAR; if (shadow & IOC4_SHADOW_DR) ret |= TIOCM_DSR; if (shadow & IOC4_SHADOW_CTS) ret |= TIOCM_CTS; return ret; } /** * ic4_start_tx - Start transmitter, flush any output * @port: Port to operate on * */ static void ic4_start_tx(struct uart_port *the_port) { struct ioc4_port *port = get_ioc4_port(the_port, 0); if (port_is_active(port, the_port)) { set_notification(port, N_OUTPUT_LOWAT, 1); enable_intrs(port, port->ip_hooks->intr_tx_mt); } } /** * ic4_break_ctl - handle breaks * @port: Port to operate on * @break_state: Break state * */ static void ic4_break_ctl(struct uart_port *the_port, int break_state) { } /** * ic4_startup - Start up the serial port * @port: Port to operate on * */ static int ic4_startup(struct uart_port *the_port) { int retval; struct ioc4_port *port; struct ioc4_control *control; struct uart_state *state; unsigned long port_flags; if (!the_port) return -ENODEV; port = get_ioc4_port(the_port, 1); if (!port) return -ENODEV; state = the_port->state; control = port->ip_control; if (!control) { port->ip_port = NULL; return -ENODEV; } /* Start up the serial port */ spin_lock_irqsave(&the_port->lock, port_flags); retval = ic4_startup_local(the_port); spin_unlock_irqrestore(&the_port->lock, port_flags); return retval; } /** * ic4_set_termios - set termios stuff * @port: port to operate on * @termios: New settings * @termios: Old * */ static void ic4_set_termios(struct uart_port *the_port, struct ktermios *termios, struct ktermios *old_termios) { unsigned long port_flags; spin_lock_irqsave(&the_port->lock, port_flags); ioc4_change_speed(the_port, termios, old_termios); spin_unlock_irqrestore(&the_port->lock, port_flags); } /** * ic4_request_port - allocate resources for port - no op.... * @port: port to operate on * */ static int ic4_request_port(struct uart_port *port) { return 0; } /* Associate the uart functions above - given to serial core */ static const struct uart_ops ioc4_ops = { .tx_empty = ic4_tx_empty, .set_mctrl = ic4_set_mctrl, .get_mctrl = ic4_get_mctrl, .stop_tx = ic4_stop_tx, .start_tx = ic4_start_tx, .stop_rx = null_void_function, .break_ctl = ic4_break_ctl, .startup = ic4_startup, .shutdown = ic4_shutdown, .set_termios = ic4_set_termios, .type = ic4_type, .release_port = null_void_function, .request_port = ic4_request_port, }; /* * Boot-time initialization code */ static struct uart_driver ioc4_uart_rs232 = { .owner = THIS_MODULE, .driver_name = "ioc4_serial_rs232", .dev_name = DEVICE_NAME_RS232, .major = DEVICE_MAJOR, .minor = DEVICE_MINOR_RS232, .nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS, }; static struct uart_driver ioc4_uart_rs422 = { .owner = THIS_MODULE, .driver_name = "ioc4_serial_rs422", .dev_name = DEVICE_NAME_RS422, .major = DEVICE_MAJOR, .minor = DEVICE_MINOR_RS422, .nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS, }; /** * ioc4_serial_remove_one - detach function * * @idd: IOC4 master module data for this IOC4 */ static int ioc4_serial_remove_one(struct ioc4_driver_data *idd) { int port_num, port_type; struct ioc4_control *control; struct uart_port *the_port; struct ioc4_port *port; struct ioc4_soft *soft; /* If serial driver did not attach, don't try to detach */ control = idd->idd_serial_data; if (!control) return 0; for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) { for (port_type = UART_PORT_MIN; port_type < UART_PORT_COUNT; port_type++) { the_port = &control->ic_port[port_num].icp_uart_port [port_type]; if (the_port) { switch (port_type) { case UART_PORT_RS422: uart_remove_one_port(&ioc4_uart_rs422, the_port); break; default: case UART_PORT_RS232: uart_remove_one_port(&ioc4_uart_rs232, the_port); break; } } } port = control->ic_port[port_num].icp_port; /* we allocate in pairs */ if (!(port_num & 1) && port) { pci_free_consistent(port->ip_pdev, TOTAL_RING_BUF_SIZE, port->ip_cpu_ringbuf, port->ip_dma_ringbuf); kfree(port); } } soft = control->ic_soft; if (soft) { free_irq(control->ic_irq, soft); if (soft->is_ioc4_serial_addr) { iounmap(soft->is_ioc4_serial_addr); release_mem_region((unsigned long) soft->is_ioc4_serial_addr, sizeof(struct ioc4_serial)); } kfree(soft); } kfree(control); idd->idd_serial_data = NULL; return 0; } /** * ioc4_serial_core_attach_rs232 - register with serial core * This is done during pci probing * @pdev: handle for this card */ static inline int ioc4_serial_core_attach(struct pci_dev *pdev, int port_type) { struct ioc4_port *port; struct uart_port *the_port; struct ioc4_driver_data *idd = pci_get_drvdata(pdev); struct ioc4_control *control = idd->idd_serial_data; int port_num; int port_type_idx; struct uart_driver *u_driver; DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n", __func__, pdev, (void *)control)); if (!control) return -ENODEV; port_type_idx = (port_type == PROTO_RS232) ? UART_PORT_RS232 : UART_PORT_RS422; u_driver = (port_type == PROTO_RS232) ? &ioc4_uart_rs232 : &ioc4_uart_rs422; /* once around for each port on this card */ for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) { the_port = &control->ic_port[port_num].icp_uart_port [port_type_idx]; port = control->ic_port[port_num].icp_port; port->ip_all_ports[port_type_idx] = the_port; DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p : type %s\n", __func__, (void *)the_port, (void *)port, port_type == PROTO_RS232 ? "rs232" : "rs422")); /* membase, iobase and mapbase just need to be non-0 */ the_port->membase = (unsigned char __iomem *)1; the_port->iobase = (pdev->bus->number << 16) | port_num; the_port->line = (Num_of_ioc4_cards << 2) | port_num; the_port->mapbase = port_type; the_port->type = PORT_16550A; the_port->fifosize = IOC4_FIFO_CHARS; the_port->ops = &ioc4_ops; the_port->irq = control->ic_irq; the_port->dev = &pdev->dev; spin_lock_init(&the_port->lock); if (uart_add_one_port(u_driver, the_port) < 0) { printk(KERN_WARNING "%s: unable to add port %d bus %d\n", __func__, the_port->line, pdev->bus->number); } else { DPRINT_CONFIG( ("IOC4 serial port %d irq = %d, bus %d\n", the_port->line, the_port->irq, pdev->bus->number)); } } return 0; } /** * ioc4_serial_attach_one - register attach function * called per card found from IOC4 master module. * @idd: Master module data for this IOC4 */ static int ioc4_serial_attach_one(struct ioc4_driver_data *idd) { unsigned long tmp_addr1; struct ioc4_serial __iomem *serial; struct ioc4_soft *soft; struct ioc4_control *control; int ret = 0; DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __func__, idd->idd_pdev, idd->idd_pci_id)); /* PCI-RT does not bring out serial connections. * Do not attach to this particular IOC4. */ if (idd->idd_variant == IOC4_VARIANT_PCI_RT) return 0; /* request serial registers */ tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET; if (!request_mem_region(tmp_addr1, sizeof(struct ioc4_serial), "sioc4_uart")) { printk(KERN_WARNING "ioc4 (%p): unable to get request region for " "uart space\n", (void *)idd->idd_pdev); ret = -ENODEV; goto out1; } serial = ioremap(tmp_addr1, sizeof(struct ioc4_serial)); if (!serial) { printk(KERN_WARNING "ioc4 (%p) : unable to remap ioc4 serial register\n", (void *)idd->idd_pdev); ret = -ENODEV; goto out2; } DPRINT_CONFIG(("%s : mem 0x%p, serial 0x%p\n", __func__, (void *)idd->idd_misc_regs, (void *)serial)); /* Get memory for the new card */ control = kzalloc(sizeof(struct ioc4_control), GFP_KERNEL); if (!control) { printk(KERN_WARNING "ioc4_attach_one" ": unable to get memory for the IOC4\n"); ret = -ENOMEM; goto out2; } idd->idd_serial_data = control; /* Allocate the soft structure */ soft = kzalloc(sizeof(struct ioc4_soft), GFP_KERNEL); if (!soft) { printk(KERN_WARNING "ioc4 (%p): unable to get memory for the soft struct\n", (void *)idd->idd_pdev); ret = -ENOMEM; goto out3; } spin_lock_init(&soft->is_ir_lock); soft->is_ioc4_misc_addr = idd->idd_misc_regs; soft->is_ioc4_serial_addr = serial; /* Init the IOC4 */ writel(0xf << IOC4_SIO_CR_CMD_PULSE_SHIFT, &idd->idd_misc_regs->sio_cr.raw); /* Enable serial port mode select generic PIO pins as outputs */ writel(IOC4_GPCR_UART0_MODESEL | IOC4_GPCR_UART1_MODESEL | IOC4_GPCR_UART2_MODESEL | IOC4_GPCR_UART3_MODESEL, &idd->idd_misc_regs->gpcr_s.raw); /* Clear and disable all serial interrupts */ write_ireg(soft, ~0, IOC4_W_IEC, IOC4_SIO_INTR_TYPE); writel(~0, &idd->idd_misc_regs->sio_ir.raw); write_ireg(soft, IOC4_OTHER_IR_SER_MEMERR, IOC4_W_IEC, IOC4_OTHER_INTR_TYPE); writel(IOC4_OTHER_IR_SER_MEMERR, &idd->idd_misc_regs->other_ir.raw); control->ic_soft = soft; /* Hook up interrupt handler */ if (!request_irq(idd->idd_pdev->irq, ioc4_intr, IRQF_SHARED, "sgi-ioc4serial", soft)) { control->ic_irq = idd->idd_pdev->irq; } else { printk(KERN_WARNING "%s : request_irq fails for IRQ 0x%x\n ", __func__, idd->idd_pdev->irq); } ret = ioc4_attach_local(idd); if (ret) goto out4; /* register port with the serial core - 1 rs232, 1 rs422 */ ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS232); if (ret) goto out4; ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS422); if (ret) goto out5; Num_of_ioc4_cards++; return ret; /* error exits that give back resources */ out5: ioc4_serial_remove_one(idd); return ret; out4: kfree(soft); out3: kfree(control); out2: if (serial) iounmap(serial); release_mem_region(tmp_addr1, sizeof(struct ioc4_serial)); out1: return ret; } static struct ioc4_submodule ioc4_serial_submodule = { .is_name = "IOC4_serial", .is_owner = THIS_MODULE, .is_probe = ioc4_serial_attach_one, .is_remove = ioc4_serial_remove_one, }; /** * ioc4_serial_init - module init */ static int __init ioc4_serial_init(void) { int ret; /* register with serial core */ if ((ret = uart_register_driver(&ioc4_uart_rs232)) < 0) { printk(KERN_WARNING "%s: Couldn't register rs232 IOC4 serial driver\n", __func__); goto out; } if ((ret = uart_register_driver(&ioc4_uart_rs422)) < 0) { printk(KERN_WARNING "%s: Couldn't register rs422 IOC4 serial driver\n", __func__); goto out_uart_rs232; } /* register with IOC4 main module */ ret = ioc4_register_submodule(&ioc4_serial_submodule); if (ret) goto out_uart_rs422; return 0; out_uart_rs422: uart_unregister_driver(&ioc4_uart_rs422); out_uart_rs232: uart_unregister_driver(&ioc4_uart_rs232); out: return ret; } static void __exit ioc4_serial_exit(void) { ioc4_unregister_submodule(&ioc4_serial_submodule); uart_unregister_driver(&ioc4_uart_rs232); uart_unregister_driver(&ioc4_uart_rs422); } late_initcall(ioc4_serial_init); /* Call only after tty init is done */ module_exit(ioc4_serial_exit); MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>"); MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC4 Base-IO Card"); MODULE_LICENSE("GPL");
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