--- /dev/null
+
+#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"
Code Review / kvmfornfv.git / blobdiff