patch-1.3.86 linux/drivers/scsi/dtc.c

• Lines: 401
• Date: Tue Apr 9 14:25:37 1996
• Orig file: v1.3.85/linux/drivers/scsi/dtc.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.85/linux/drivers/scsi/dtc.c linux/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 {
+   unsigned char *address;
+   int irq;
+} overrides
+#ifdef OVERRIDE
+[] = OVERRIDE;
+#else
+[4] = {{NULL, IRQ_AUTO}, {NULL, IRQ_AUTO}, {NULL, IRQ_AUTO},
+     {NULL, IRQ_AUTO}};
+#endif
+
+#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
+
+static struct base {
+   unsigned char *address;
+   int noauto;
+} bases[] = {{(unsigned char *) 0xcc000, 0}, {(unsigned char *) 0xc8000, 0},
+{(unsigned char *) 0xdc000, 0}, {(unsigned char *) 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 = (unsigned char *) ints[1];
+      overrides[commandline_current].irq = ints[2];
+      for (i = 0; i < NO_BASES; ++i)
+	 if (bases[i].address == (unsigned char *) 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 = 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
+	      (bases[current_base].address + signatures[sig].offset,
+	      signatures[sig].string, strlen(signatures[sig].string))) {
+	    base = 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