dtc.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:11k
- #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 <asm/system.h>
- #include <linux/module.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/blk.h>
- #include <asm/io.h>
- #include "scsi.h"
- #include "hosts.h"
- #include "dtc.h"
- #define AUTOPROBE_IRQ
- #include "NCR5380.h"
- #include "constants.h"
- #include "sd.h"
- #include <linux/stat.h>
- #include <linux/string.h>
- #include <linux/init.h>
- #define DTC_PUBLIC_RELEASE 2
- /*#define DTCDEBUG 0x1*/
- #define DTCDEBUG_INIT 0x1
- #define DTCDEBUG_TRANSFER 0x2
- /*
- * 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 (sizeof(overrides) / sizeof(struct override))
- static struct base {
- unsigned long address;
- int noauto;
- } bases[] __initdata = {
- {0xcc000, 0},
- {0xc8000, 0},
- {0xdc000, 0},
- {0xd8000, 0}
- };
- #define NO_BASES (sizeof (bases) / sizeof (struct base))
- static const struct signature {
- const char *string;
- int offset;
- } signatures[] = {
- {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
- };
- #define NO_SIGNATURES (sizeof (signatures) / sizeof (struct signature))
- /**
- * dtc_setup - option setup for dtc3x80
- *
- * LILO command line initialization of the overrides array,
- */
- static int __init dtc_setup(char *str)
- {
- static int commandline_current = 0;
- int i;
- int ints[10];
- get_options(str, sizeof(ints) / sizeof(int), ints);
-
- if (ints[0] != 2)
- printk(KERN_ERR "dtc_setup: usage dtc=address,irqn");
- 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);
- /**
- * dtc_detect - detect DTC 3x80 controllers
- * @tpnt: controller template
- *
- * Detects and initializes DTC 3180/3280 controllers
- * that were autoprobed, overridden on the LILO command line,
- * or specified at compile time.
- */
- int __init dtc_detect(Scsi_Host_Template * tpnt)
- {
- static int current_override = 0, current_base = 0;
- struct Scsi_Host *instance;
- unsigned int base;
- int sig, count;
- tpnt->proc_name = "dtc3x80";
- tpnt->proc_info = &dtc_proc_info;
- for (count = 0; current_override < NO_OVERRIDES; ++current_override)
- {
- base = 0;
- if (overrides[current_override].address)
- base = overrides[current_override].address;
- else
- {
- for (; !base && (current_base < NO_BASES); ++current_base) {
- for (sig = 0; sig < NO_SIGNATURES; ++sig)
- {
- if (!bases[current_base].noauto && isa_check_signature(bases[current_base].address + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
- base = bases[current_base].address;
- break;
- }
- }
- }
- }
- if (!base)
- break;
- instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
- if (instance == NULL)
- break;
- instance->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 figure it out. */
- if (instance->irq != IRQ_NONE)
- if (request_irq(instance->irq, do_dtc_intr, SA_INTERRUPT, "dtc"))
- {
- printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabledn", instance->host_no, instance->irq);
- instance->irq = IRQ_NONE;
- }
- if (instance->irq == IRQ_NONE) {
- printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,n", instance->host_no);
- printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.n", instance->host_no);
- }
- #else
- if (instance->irq != IRQ_NONE)
- printk(KERN_INFO "scsi%d : interrupts not used. Might as well not jumper it.n", instance->host_no);
- instance->irq = IRQ_NONE;
- #endif
- printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
- if (instance->irq == 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;
- }
- /**
- * dtc_biosparam - compute disk geometry
- * @disk: disk to generate for
- * @dev: major/minor of device
- * @ip: returned geometry
- *
- * Generates a BIOS / DOS compatible H-C-S mapping for
- * the specified device / size.
- */
- int dtc_biosparam(Disk * disk, kdev_t dev, int *ip)
- {
- int size = disk->capacity;
- ip[0] = 64;
- ip[1] = 32;
- ip[2] = size >> 11;
- return 0;
- }
- static int dtc_maxi = 0;
- static int dtc_wmaxi = 0;
- /**
- * NCR5380_pread - fast pseudo DMA read
- * @instance: controller
- * @dst: destination buffer
- * @len: expected/max size
- *
- * Fast 5380 pseudo-dma read function, reads len bytes from the controller
- * mmio area into dst.
- */
- 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 == 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);
- isa_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);
- }
- /**
- * NCR5380_pwrite - fast pseudo DMA write
- * @instance: controller
- * @dst: destination buffer
- * @len: expected/max size
- *
- * Fast 5380 pseudo-dma write function, writes len bytes to the
- * controller mmio area from src.
- */
- 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 == 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);
- isa_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"
- /* Eventually this will go into an include file, but this will be later */
- static Scsi_Host_Template driver_template = DTC3x80;
- #include "scsi_module.c"