#define AUTOSENSE #define PSEUDO_DMA #define DONT_USE_INTR #define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */ #define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\ NDEBUG_SELECTION+NDEBUG_ARBITRATION) #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 * * DISTRIBUTION RELEASE 1. * * For more information, please consult * * NCR 5380 Family * SCSI Protocol Controller * Databook */ /* * Options : * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically * for commands that return with a CHECK CONDITION status. * * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance * increase compared to polled I/O. * * PARITY - enable parity checking. Not supported. * * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. * You probably want this. * * 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.h" #include <scsi/scsi_host.h> #include "dtc.h" #define AUTOPROBE_IRQ #include "NCR5380.h" #define DTC_PUBLIC_RELEASE 2 /* * 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 void __init dtc_setup(char *str, int *ints) { static int commandline_current = 0; int i; 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; } } #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; tpnt->proc_name = "dtc3x80"; tpnt->proc_info = &dtc_proc_info; 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); #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 != SCSI_IRQ_NONE) if (request_irq(instance->irq, dtc_intr, IRQF_DISABLED, "dtc", instance)) { printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq); instance->irq = SCSI_IRQ_NONE; } if (instance->irq == SCSI_IRQ_NONE) { 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 != SCSI_IRQ_NONE) printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no); instance->irq = SCSI_IRQ_NONE; #endif #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT) printk("scsi%d : irq = %d\n", instance->host_no, instance->irq); #endif printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base); if (instance->irq == SCSI_IRQ_NONE) printk(" interrupts disabled"); else printk(" irq %d", instance->irq); printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE); NCR5380_print_options(instance); printk("\n"); ++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 int dtc_maxi = 0; static int dtc_wmaxi = 0; 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 */ 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 == SCSI_IRQ_NONE) 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 > dtc_maxi) dtc_maxi = 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; 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 == SCSI_IRQ_NONE) 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 > dtc_wmaxi) dtc_wmaxi = 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) 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, .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"