/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003-2005 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/serial.h>
#include <linux/serialP.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>
/*
* 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/comsumer 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;
} ioc4_serial;
/* 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 "ttyIOC"
#define DEVICE_MAJOR 204
#define DEVICE_MINOR 50
/* 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 */
enum sio_proto {
PROTO_RS232,
PROTO_RS422
};
/* 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
*/
struct ioc4_control {
int ic_irq;
struct {
/* uart ports are allocated here */
struct uart_port icp_uart_port;
/* 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;
/* 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
/* 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);
/**
* 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
*/
static struct ioc4_port *get_ioc4_port(struct uart_port *the_port)
{
struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev);
struct ioc4_control *control = idd->idd_serial_data;
int ii;
if (control) {
for ( ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++ ) {
if (!control->ic_port[ii].icp_port)
continue;
if (the_port == control->ic_port[ii].icp_port->ip_port)
return control->ic_port[ii].icp_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 int inline 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",
__FUNCTION__, 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 int 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%lx, "
"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(&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
* @regs: registers
*/
static irqreturn_t ioc4_intr(int irq, void *arg, struct pt_regs *regs)
{
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 *ii;
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++) {
ii = &soft->is_intr_type[intr_type].is_intr_info[xx];
if ((this_mir = this_ir & ii->sd_bits)) {
/* Disable owned interrupts, call handler */
handled++;
write_ireg(soft, ii->sd_bits, IOC4_W_IEC,
intr_type);
ii->sd_intr(ii->sd_info, this_mir);
this_ir &= ~this_mir;
}
}
}
#ifdef DEBUG_INTERRUPTS
{
struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
spinlock_t *lp = &soft->is_ir_lock;
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",
__FUNCTION__, __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 int inline 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 = kmalloc(sizeof(struct ioc4_port), GFP_KERNEL);
if (!port) {
printk(KERN_WARNING
"IOC4 serial memory not available for port\n");
return -ENOMEM;
}
memset(port, 0, sizeof(struct ioc4_port));
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",
__FUNCTION__,
(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",
__FUNCTION__,
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",
__FUNCTION__,
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;
}
/**
* 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 = 0;
/* 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;
}
}
}
/* 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",
__FUNCTION__, 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
* @set: set ?
* @mask1: mcr mask
* @mask2: shadow mask
*/
static inline int set_mcr(struct uart_port *the_port, int set,
int mask1, int mask2)
{
struct ioc4_port *port = get_ioc4_port(the_port);
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 */
if (set) {
mcr |= mask1;
shadow |= mask2;
} else {
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, enum sio_proto 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);
struct uart_info *info;
if (!the_port)
return;
if (!port)
return;
info = the_port->info;
tty = info->tty;
if (uart_circ_empty(&info->xmit) || uart_tx_stopped(the_port)) {
/* Nothing to do or hw stopped */
set_notification(port, N_ALL_OUTPUT, 0);
return;
}
head = info->xmit.head;
tail = info->xmit.tail;
start = (char *)&info->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;
info->xmit.tail = tail;
start = (char *)&info->xmit.buf[tail];
}
}
if (uart_circ_chars_pending(&info->xmit) < WAKEUP_CHARS)
uart_write_wakeup(the_port);
if (uart_circ_empty(&info->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 termios *new_termios, struct termios *old_termios)
{
struct ioc4_port *port = get_ioc4_port(the_port);
int baud, bits;
unsigned cflag;
int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
struct uart_info *info = the_port->info;
cflag = new_termios->c_cflag;
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", __FUNCTION__, 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;
info->tty->low_latency = 1;
if (I_IGNPAR(info->tty))
the_port->ignore_status_mask &= ~(N_PARITY_ERROR
| N_FRAMING_ERROR);
if (I_IGNBRK(info->tty)) {
the_port->ignore_status_mask &= ~N_BREAK;
if (I_IGNPAR(info->tty))
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",
__FUNCTION__, (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_info *info;
if (!the_port)
return -1;
port = get_ioc4_port(the_port);
if (!port)
return -1;
info = the_port->info;
local_open(port);
/* set the speed of the serial port */
ioc4_change_speed(the_port, info->tty->termios, (struct termios *)0);
return 0;
}
/*
* ioc4_cb_output_lowat - called when the output low water mark is hit
* @port: port to output
*/
static void ioc4_cb_output_lowat(struct ioc4_port *port)
{
unsigned long pflags;
/* ip_lock is set on the call here */
if (port->ip_port) {
spin_lock_irqsave(&port->ip_port->lock, pflags);
transmit_chars(port->ip_port);
spin_unlock_irqrestore(&port->ip_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 int 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-> info->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->info->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);
}
/* 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);
/* 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);
struct ring *inring;
struct ring_entry *entry;
struct hooks *hooks = port->ip_hooks;
int byte_num;
char *sc;
int loop_counter;
BUG_ON(!(len >= 0));
BUG_ON(!port);
/* 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->info->
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)
{
struct tty_struct *tty;
unsigned char ch[IOC4_MAX_CHARS];
int read_count, request_count = IOC4_MAX_CHARS;
struct uart_icount *icount;
struct uart_info *info = the_port->info;
int flip = 0;
unsigned long pflags;
/* Make sure all the pointers are "good" ones */
if (!info)
return;
if (!info->tty)
return;
spin_lock_irqsave(&the_port->lock, pflags);
tty = info->tty;
request_count = tty_buffer_request_room(tty, IOC4_MAX_CHARS - 2);
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(tty, ch, read_count);
icount->rx += read_count;
}
}
spin_unlock_irqrestore(&the_port->lock, pflags);
if (flip)
tty_flip_buffer_push(tty);
}
/**
* 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)
{
return "SGI IOC4 Serial";
}
/**
* ic4_tx_empty - Is the transmitter empty? We pretend we're always empty
* @port: Port to operate on (we ignore since we always return 1)
*
*/
static unsigned int ic4_tx_empty(struct uart_port *the_port)
{
return 1;
}
/**
* ic4_stop_tx - stop the transmitter
* @port: Port to operate on
*
*/
static void ic4_stop_tx(struct uart_port *the_port)
{
}
/**
* 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_info *info;
port = get_ioc4_port(the_port);
if (!port)
return;
info = the_port->info;
wake_up_interruptible(&info->delta_msr_wait);
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
spin_lock_irqsave(&the_port->lock, port_flags);
set_notification(port, N_ALL, 0);
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;
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, 1, 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);
uint32_t shadow;
unsigned int ret = 0;
if (!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);
if (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 - always return 0 (We're always on)
* @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_info *info;
unsigned long port_flags;
if (!the_port) {
return -ENODEV;
}
port = get_ioc4_port(the_port);
if (!port) {
return -ENODEV;
}
info = the_port->info;
control = port->ip_control;
if (!control) {
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 termios *termios, struct termios *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 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,
.enable_ms = 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 = {
.owner = THIS_MODULE,
.driver_name = "ioc4_serial",
.dev_name = DEVICE_NAME,
.major = DEVICE_MAJOR,
.minor = DEVICE_MINOR,
.nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
};
/**
* ioc4_serial_core_attach - 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)
{
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 ii;
DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n",
__FUNCTION__, pdev, (void *)control));
if (!control)
return -ENODEV;
/* once around for each port on this card */
for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
the_port = &control->ic_port[ii].icp_uart_port;
port = control->ic_port[ii].icp_port;
port->ip_port = the_port;
DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p\n",
__FUNCTION__, (void *)the_port,
(void *)port));
/* membase, iobase and mapbase just need to be non-0 */
the_port->membase = (unsigned char __iomem *)1;
the_port->iobase = (pdev->bus->number << 16) | ii;
the_port->line = (Num_of_ioc4_cards << 2) | ii;
the_port->mapbase = 1;
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(&ioc4_uart, the_port) < 0) {
printk(KERN_WARNING
"%s: unable to add port %d bus %d\n",
__FUNCTION__, 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));
}
/* all ports are rs232 for now */
ioc4_set_proto(port, PROTO_RS232);
}
return 0;
}
/**
* ioc4_serial_attach_one - register attach function
* called per card found from IOC4 master module.
* @idd: Master module data for this IOC4
*/
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", __FUNCTION__, idd->idd_pdev, idd->idd_pci_id));
/* request serial registers */
tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET;
if (!request_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",
__FUNCTION__, (void *)idd->idd_misc_regs, (void *)serial));
/* Get memory for the new card */
control = kmalloc(sizeof(struct ioc4_control) * IOC4_NUM_SERIAL_PORTS,
GFP_KERNEL);
if (!control) {
printk(KERN_WARNING "ioc4_attach_one"
": unable to get memory for the IOC4\n");
ret = -ENOMEM;
goto out2;
}
memset(control, 0, sizeof(struct ioc4_control));
idd->idd_serial_data = control;
/* Allocate the soft structure */
soft = kmalloc(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;
}
memset(soft, 0, sizeof(struct ioc4_soft));
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, SA_SHIRQ,
"sgi-ioc4serial", (void *)soft)) {
control->ic_irq = idd->idd_pdev->irq;
} else {
printk(KERN_WARNING
"%s : request_irq fails for IRQ 0x%x\n ",
__FUNCTION__, idd->idd_pdev->irq);
}
ret = ioc4_attach_local(idd);
if (ret)
goto out4;
/* register port with the serial core */
if ((ret = ioc4_serial_core_attach(idd->idd_pdev)))
goto out4;
Num_of_ioc4_cards++;
return ret;
/* error exits that give back resources */
out4:
kfree(soft);
out3:
kfree(control);
out2:
release_region(tmp_addr1, sizeof(struct ioc4_serial));
out1:
return ret;
}
/**
* ioc4_serial_remove_one - detach function
*
* @idd: IOC4 master module data for this IOC4
*/
int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
{
int ii;
struct ioc4_control *control;
struct uart_port *the_port;
struct ioc4_port *port;
struct ioc4_soft *soft;
control = idd->idd_serial_data;
for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
the_port = &control->ic_port[ii].icp_uart_port;
if (the_port) {
uart_remove_one_port(&ioc4_uart, the_port);
}
port = control->ic_port[ii].icp_port;
if (!(ii & 1) && port) {
pci_free_consistent(port->ip_pdev,
TOTAL_RING_BUF_SIZE,
(void *)port->ip_cpu_ringbuf,
port->ip_dma_ringbuf);
kfree(port);
}
}
soft = control->ic_soft;
if (soft) {
free_irq(control->ic_irq, (void *)soft);
if (soft->is_ioc4_serial_addr) {
release_region((unsigned long)
soft->is_ioc4_serial_addr,
sizeof(struct ioc4_serial));
}
kfree(soft);
}
kfree(control);
idd->idd_serial_data = NULL;
return 0;
}
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
*/
int ioc4_serial_init(void)
{
int ret;
/* register with serial core */
if ((ret = uart_register_driver(&ioc4_uart)) < 0) {
printk(KERN_WARNING
"%s: Couldn't register IOC4 serial driver\n",
__FUNCTION__);
return ret;
}
/* register with IOC4 main module */
return ioc4_register_submodule(&ioc4_serial_submodule);
}
static void __devexit ioc4_serial_exit(void)
{
ioc4_unregister_submodule(&ioc4_serial_submodule);
uart_unregister_driver(&ioc4_uart);
}
module_init(ioc4_serial_init);
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");
