1 files changed, 494 insertions, 0 deletions

diff --git a/drivers/scsi/dtc.c b/drivers/scsi/dtc.c
new file mode 100644
index 000000000000..da1aaa413fed
--- /dev/null
+++ b/drivers/scsi/dtc.c
@@ -0,0 +1,494 @@
+
+#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/blkdev.h>
+#include <linux/delay.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/io.h>
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "dtc.h"
+#define AUTOPROBE_IRQ
+#include "NCR5380.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))
+
+#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(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(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("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("scsi-dtc : detected board.\n");
+#endif
+                                                goto found;
+                                        }
+                                }
+                                iounmap(base);
+                        }
+
+#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
+                printk("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, SA_INTERRUPT, "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, NULL);
+        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 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,
+        .eh_device_reset_handler        = dtc_device_reset,
+        .eh_host_reset_handler          = dtc_host_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"