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Diffstat (limited to 'linux/src/drivers/scsi/dtc.c')
-rw-r--r--linux/src/drivers/scsi/dtc.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/linux/src/drivers/scsi/dtc.c b/linux/src/drivers/scsi/dtc.c
new file mode 100644
index 0000000..94c3e33
--- /dev/null
+++ b/linux/src/drivers/scsi/dtc.c
@@ -0,0 +1,400 @@
+
+#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/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>
+
+struct proc_dir_entry proc_scsi_dtc = {
+ PROC_SCSI_T128, 7, "dtc3x80",
+ S_IFDIR | S_IRUGO | S_IXUGO, 2
+ };
+
+
+static struct override {
+ __u32 address;
+ int irq;
+} overrides
+#ifdef OVERRIDE
+[] = OVERRIDE;
+#else
+[4] = {{0, IRQ_AUTO}, {0, IRQ_AUTO}, {0, IRQ_AUTO},
+ {0, IRQ_AUTO}};
+#endif
+
+#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
+
+static struct base {
+ __u32 address;
+ int noauto;
+} bases[] = {{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))
+
+/*
+ * 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.
+ *
+*/
+
+void 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;
+ }
+}
+
+/*
+ * Function : int dtc_detect(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.
+ *
+*/
+
+
+int dtc_detect(Scsi_Host_Template * tpnt) {
+ static int current_override = 0, current_base = 0;
+ struct Scsi_Host *instance;
+ unsigned char *base;
+ int sig, count;
+
+ tpnt->proc_dir = &proc_scsi_dtc;
+ tpnt->proc_info = &dtc_proc_info;
+
+ for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
+ base = NULL;
+
+ if (overrides[current_override].address)
+ base = (unsigned char *)overrides[current_override].address;
+ else
+ for (; !base && (current_base < NO_BASES); ++current_base) {
+#if (DTCDEBUG & DTCDEBUG_INIT)
+ printk("scsi : probing address %08x\n", (unsigned int) bases[current_base].address);
+#endif
+ for (sig = 0; sig < NO_SIGNATURES; ++sig)
+ if (!bases[current_base].noauto && !memcmp
+ ((unsigned char *)(bases[current_base].address + signatures[sig].offset),
+ signatures[sig].string, strlen(signatures[sig].string))) {
+ base = (unsigned char *)bases[current_base].address;
+#if (DTCDEBUG & DTCDEBUG_INIT)
+ printk("scsi-dtc : detected board.\n");
+#endif
+ break;
+ }
+ }
+
+#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
+ printk("scsi-dtc : base = %08x\n", (unsigned int) base);
+#endif
+
+ if (!base)
+ break;
+
+ instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
+ 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 finger it out. */
+ if (instance->irq != IRQ_NONE)
+ if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc")) {
+ printk("scsi%d : IRQ%d not free, interrupts disabled\n",
+ instance->host_no, instance->irq);
+ instance->irq = IRQ_NONE;
+ }
+
+ if (instance->irq == IRQ_NONE) {
+ printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
+ printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
+ }
+#else
+ if (instance->irq != IRQ_NONE)
+ printk("scsi%d : interrupts not used. Might as well not jumper it.\n",
+ instance->host_no);
+ instance->irq = IRQ_NONE;
+#endif
+#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
+ printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
+#endif
+
+ printk("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;
+}
+
+/*
+ * Function : int dtc_biosparam(Disk * disk, kdev_t 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.
+*/
+
+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;
+}
+
+/****************************************************************
+ * 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 == 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(d, (char *)(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 == 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((char *)(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);
+}
+
+#include "NCR5380.c"
+
+#ifdef MODULE
+/* Eventually this will go into an include file, but this will be later */
+Scsi_Host_Template driver_template = DTC3x80;
+
+#include "scsi_module.c"
+#endif
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