diff options
Diffstat (limited to 'kernel/drivers/scsi/dtc.c')
| -rw-r--r-- | kernel/drivers/scsi/dtc.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/dtc.c b/kernel/drivers/scsi/dtc.c new file mode 100644 index 000000000..4c74c7ba2 --- /dev/null +++ b/kernel/drivers/scsi/dtc.c @@ -0,0 +1,459 @@ + +#define PSEUDO_DMA +#define DONT_USE_INTR +#define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */ +#define DMA_WORKS_RIGHT + + +/* + * DTC 3180/3280 driver, by + * Ray Van Tassle rayvt@comm.mot.com + * + * taken from ... + * Trantor T128/T128F/T228 driver by... + * + * Drew Eckhardt + * Visionary Computing + * (Unix and Linux consulting and custom programming) + * drew@colorado.edu + * +1 (303) 440-4894 + */ + +/* + * The card is detected and initialized in one of several ways : + * 1. Autoprobe (default) - since the board is memory mapped, + * a BIOS signature is scanned for to locate the registers. + * An interrupt is triggered to autoprobe for the interrupt + * line. + * + * 2. With command line overrides - dtc=address,irq may be + * used on the LILO command line to override the defaults. + * +*/ + +/*----------------------------------------------------------------*/ +/* the following will set the monitor border color (useful to find + where something crashed or gets stuck at */ +/* 1 = blue + 2 = green + 3 = cyan + 4 = red + 5 = magenta + 6 = yellow + 7 = white +*/ +#if 0 +#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);} +#else +#define rtrc(i) {} +#endif + + +#include <linux/module.h> +#include <linux/signal.h> +#include <linux/blkdev.h> +#include <linux/delay.h> +#include <linux/stat.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <scsi/scsi_host.h> +#include "dtc.h" +#define AUTOPROBE_IRQ +#include "NCR5380.h" + +/* + * The DTC3180 & 3280 boards are memory mapped. + * + */ + +/* + */ +/* Offset from DTC_5380_OFFSET */ +#define DTC_CONTROL_REG 0x100 /* rw */ +#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */ +#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */ + +#define CSR_RESET 0x80 /* wo Resets 53c400 */ +#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */ +#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */ +#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */ +#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */ +#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */ +#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */ +#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */ +#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */ +#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR) + + +#define DTC_BLK_CNT 0x101 /* rw + * # of 128-byte blocks to transfer */ + + +#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */ + +#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */ +#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer + * after disconnect/reconnect*/ + +#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */ + +/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */ +#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */ + +static struct override { + unsigned int address; + int irq; +} overrides +#ifdef OVERRIDE +[] __initdata = OVERRIDE; +#else +[4] __initdata = { + { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO } +}; +#endif + +#define NO_OVERRIDES ARRAY_SIZE(overrides) + +static struct base { + unsigned long address; + int noauto; +} bases[] __initdata = { + { 0xcc000, 0 }, + { 0xc8000, 0 }, + { 0xdc000, 0 }, + { 0xd8000, 0 } +}; + +#define NO_BASES ARRAY_SIZE(bases) + +static const struct signature { + const char *string; + int offset; +} signatures[] = { + {"DATA TECHNOLOGY CORPORATION BIOS", 0x25}, +}; + +#define NO_SIGNATURES ARRAY_SIZE(signatures) + +#ifndef MODULE +/* + * Function : dtc_setup(char *str, int *ints) + * + * Purpose : LILO command line initialization of the overrides array, + * + * Inputs : str - unused, ints - array of integer parameters with ints[0] + * equal to the number of ints. + * + */ + +static int __init dtc_setup(char *str) +{ + static int commandline_current = 0; + int i; + int ints[10]; + + get_options(str, ARRAY_SIZE(ints), ints); + if (ints[0] != 2) + printk("dtc_setup: usage dtc=address,irq\n"); + else if (commandline_current < NO_OVERRIDES) { + overrides[commandline_current].address = ints[1]; + overrides[commandline_current].irq = ints[2]; + for (i = 0; i < NO_BASES; ++i) + if (bases[i].address == ints[1]) { + bases[i].noauto = 1; + break; + } + ++commandline_current; + } + return 1; +} + +__setup("dtc=", dtc_setup); +#endif + +/* + * Function : int dtc_detect(struct scsi_host_template * tpnt) + * + * Purpose : detects and initializes DTC 3180/3280 controllers + * that were autoprobed, overridden on the LILO command line, + * or specified at compile time. + * + * Inputs : tpnt - template for this SCSI adapter. + * + * Returns : 1 if a host adapter was found, 0 if not. + * +*/ + +static int __init dtc_detect(struct scsi_host_template * tpnt) +{ + static int current_override = 0, current_base = 0; + struct Scsi_Host *instance; + unsigned int addr; + void __iomem *base; + int sig, count; + + for (count = 0; current_override < NO_OVERRIDES; ++current_override) { + addr = 0; + base = NULL; + + if (overrides[current_override].address) { + addr = overrides[current_override].address; + base = ioremap(addr, 0x2000); + if (!base) + addr = 0; + } else + for (; !addr && (current_base < NO_BASES); ++current_base) { +#if (DTCDEBUG & DTCDEBUG_INIT) + printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address); +#endif + if (bases[current_base].noauto) + continue; + base = ioremap(bases[current_base].address, 0x2000); + if (!base) + continue; + for (sig = 0; sig < NO_SIGNATURES; ++sig) { + if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) { + addr = bases[current_base].address; +#if (DTCDEBUG & DTCDEBUG_INIT) + printk(KERN_DEBUG "scsi-dtc : detected board.\n"); +#endif + goto found; + } + } + iounmap(base); + } + +#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT) + printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr); +#endif + + if (!addr) + break; + +found: + instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata)); + if (instance == NULL) + break; + + instance->base = addr; + ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base; + + NCR5380_init(instance, 0); + + NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */ + if (overrides[current_override].irq != IRQ_AUTO) + instance->irq = overrides[current_override].irq; + else + instance->irq = NCR5380_probe_irq(instance, DTC_IRQS); + + /* Compatibility with documented NCR5380 kernel parameters */ + if (instance->irq == 255) + instance->irq = NO_IRQ; + +#ifndef DONT_USE_INTR + /* With interrupts enabled, it will sometimes hang when doing heavy + * reads. So better not enable them until I finger it out. */ + if (instance->irq != NO_IRQ) + if (request_irq(instance->irq, dtc_intr, 0, + "dtc", instance)) { + printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq); + instance->irq = NO_IRQ; + } + + if (instance->irq == NO_IRQ) { + printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no); + printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no); + } +#else + if (instance->irq != NO_IRQ) + printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no); + instance->irq = NO_IRQ; +#endif +#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT) + printk("scsi%d : irq = %d\n", instance->host_no, instance->irq); +#endif + + ++current_override; + ++count; + } + return count; +} + +/* + * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip) + * + * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for + * the specified device / size. + * + * Inputs : size = size of device in sectors (512 bytes), dev = block device + * major / minor, ip[] = {heads, sectors, cylinders} + * + * Returns : always 0 (success), initializes ip + * +*/ + +/* + * XXX Most SCSI boards use this mapping, I could be incorrect. Some one + * using hard disks on a trantor should verify that this mapping corresponds + * to that used by the BIOS / ASPI driver by running the linux fdisk program + * and matching the H_C_S coordinates to what DOS uses. +*/ + +static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev, + sector_t capacity, int *ip) +{ + int size = capacity; + + ip[0] = 64; + ip[1] = 32; + ip[2] = size >> 11; + return 0; +} + + +/**************************************************************** + * Function : int NCR5380_pread (struct Scsi_Host *instance, + * unsigned char *dst, int len) + * + * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to + * dst + * + * Inputs : dst = destination, len = length in bytes + * + * Returns : 0 on success, non zero on a failure such as a watchdog + * timeout. +*/ + +static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len) +{ + unsigned char *d = dst; + int i; /* For counting time spent in the poll-loop */ + struct NCR5380_hostdata *hostdata = shost_priv(instance); + NCR5380_local_declare(); + NCR5380_setup(instance); + + i = 0; + NCR5380_read(RESET_PARITY_INTERRUPT_REG); + NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE); + if (instance->irq == NO_IRQ) + NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ); + else + NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE); + NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */ + rtrc(1); + while (len > 0) { + rtrc(2); + while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY) + ++i; + rtrc(3); + memcpy_fromio(d, base + DTC_DATA_BUF, 128); + d += 128; + len -= 128; + rtrc(7); + /*** with int's on, it sometimes hangs after here. + * Looks like something makes HBNR go away. */ + } + rtrc(4); + while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS)) + ++i; + NCR5380_write(MODE_REG, 0); /* Clear the operating mode */ + rtrc(0); + NCR5380_read(RESET_PARITY_INTERRUPT_REG); + if (i > hostdata->spin_max_r) + hostdata->spin_max_r = i; + return (0); +} + +/**************************************************************** + * Function : int NCR5380_pwrite (struct Scsi_Host *instance, + * unsigned char *src, int len) + * + * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from + * src + * + * Inputs : src = source, len = length in bytes + * + * Returns : 0 on success, non zero on a failure such as a watchdog + * timeout. +*/ + +static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len) +{ + int i; + struct NCR5380_hostdata *hostdata = shost_priv(instance); + NCR5380_local_declare(); + NCR5380_setup(instance); + + NCR5380_read(RESET_PARITY_INTERRUPT_REG); + NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE); + /* set direction (write) */ + if (instance->irq == NO_IRQ) + NCR5380_write(DTC_CONTROL_REG, 0); + else + NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); + NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */ + for (i = 0; len > 0; ++i) { + rtrc(5); + /* Poll until the host buffer can accept data. */ + while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY) + ++i; + rtrc(3); + memcpy_toio(base + DTC_DATA_BUF, src, 128); + src += 128; + len -= 128; + } + rtrc(4); + while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS)) + ++i; + rtrc(6); + /* Wait until the last byte has been sent to the disk */ + while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)) + ++i; + rtrc(7); + /* Check for parity error here. fixme. */ + NCR5380_write(MODE_REG, 0); /* Clear the operating mode */ + rtrc(0); + if (i > hostdata->spin_max_w) + hostdata->spin_max_w = i; + return (0); +} + +MODULE_LICENSE("GPL"); + +#include "NCR5380.c" + +static int dtc_release(struct Scsi_Host *shost) +{ + NCR5380_local_declare(); + NCR5380_setup(shost); + if (shost->irq != NO_IRQ) + free_irq(shost->irq, shost); + NCR5380_exit(shost); + if (shost->io_port && shost->n_io_port) + release_region(shost->io_port, shost->n_io_port); + scsi_unregister(shost); + iounmap(base); + return 0; +} + +static struct scsi_host_template driver_template = { + .name = "DTC 3180/3280 ", + .detect = dtc_detect, + .release = dtc_release, + .proc_name = "dtc3x80", + .show_info = dtc_show_info, + .write_info = dtc_write_info, + .info = dtc_info, + .queuecommand = dtc_queue_command, + .eh_abort_handler = dtc_abort, + .eh_bus_reset_handler = dtc_bus_reset, + .bios_param = dtc_biosparam, + .can_queue = CAN_QUEUE, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = CMD_PER_LUN, + .use_clustering = DISABLE_CLUSTERING, +}; +#include "scsi_module.c" |