487 lines
13 KiB
C
487 lines
13 KiB
C
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#define AUTOSENSE
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#define PSEUDO_DMA
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#define DONT_USE_INTR
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#define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */
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#define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
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NDEBUG_SELECTION+NDEBUG_ARBITRATION)
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#define DMA_WORKS_RIGHT
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/*
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* DTC 3180/3280 driver, by
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* Ray Van Tassle rayvt@comm.mot.com
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*
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* taken from ...
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* Trantor T128/T128F/T228 driver by...
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*
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* Drew Eckhardt
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* Visionary Computing
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* (Unix and Linux consulting and custom programming)
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* drew@colorado.edu
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* +1 (303) 440-4894
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*
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* DISTRIBUTION RELEASE 1.
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*
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* For more information, please consult
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*
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* NCR 5380 Family
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* SCSI Protocol Controller
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* Databook
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*/
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/*
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* Options :
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* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
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* for commands that return with a CHECK CONDITION status.
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*
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* PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
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* increase compared to polled I/O.
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*
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* PARITY - enable parity checking. Not supported.
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*
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* UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
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* You probably want this.
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*
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* The card is detected and initialized in one of several ways :
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* 1. Autoprobe (default) - since the board is memory mapped,
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* a BIOS signature is scanned for to locate the registers.
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* An interrupt is triggered to autoprobe for the interrupt
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* line.
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*
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* 2. With command line overrides - dtc=address,irq may be
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* used on the LILO command line to override the defaults.
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*
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*/
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/*----------------------------------------------------------------*/
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/* the following will set the monitor border color (useful to find
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where something crashed or gets stuck at */
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/* 1 = blue
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2 = green
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3 = cyan
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4 = red
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5 = magenta
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6 = yellow
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7 = white
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*/
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#if 0
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#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
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#else
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#define rtrc(i) {}
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#endif
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#include <asm/system.h>
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include "dtc.h"
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#define AUTOPROBE_IRQ
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#include "NCR5380.h"
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#define DTC_PUBLIC_RELEASE 2
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/*
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* The DTC3180 & 3280 boards are memory mapped.
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*
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*/
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/*
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*/
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/* Offset from DTC_5380_OFFSET */
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#define DTC_CONTROL_REG 0x100 /* rw */
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#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
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#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
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#define CSR_RESET 0x80 /* wo Resets 53c400 */
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#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
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#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
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#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
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#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
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#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
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#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
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#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
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#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
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#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
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#define DTC_BLK_CNT 0x101 /* rw
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* # of 128-byte blocks to transfer */
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#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
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#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
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#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
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* after disconnect/reconnect*/
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#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
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/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
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#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
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static struct override {
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unsigned int address;
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int irq;
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} overrides
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#ifdef OVERRIDE
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[] __initdata = OVERRIDE;
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#else
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[4] __initdata = {
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{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
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};
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#endif
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#define NO_OVERRIDES ARRAY_SIZE(overrides)
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static struct base {
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unsigned long address;
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int noauto;
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} bases[] __initdata = {
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{ 0xcc000, 0 },
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{ 0xc8000, 0 },
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{ 0xdc000, 0 },
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{ 0xd8000, 0 }
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};
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#define NO_BASES ARRAY_SIZE(bases)
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static const struct signature {
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const char *string;
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int offset;
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} signatures[] = {
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{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
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};
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#define NO_SIGNATURES ARRAY_SIZE(signatures)
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#ifndef MODULE
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/*
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* Function : dtc_setup(char *str, int *ints)
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*
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* Purpose : LILO command line initialization of the overrides array,
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*
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* Inputs : str - unused, ints - array of integer parameters with ints[0]
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* equal to the number of ints.
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*
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*/
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static void __init dtc_setup(char *str, int *ints)
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{
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static int commandline_current = 0;
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int i;
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if (ints[0] != 2)
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printk("dtc_setup: usage dtc=address,irq\n");
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else if (commandline_current < NO_OVERRIDES) {
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overrides[commandline_current].address = ints[1];
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overrides[commandline_current].irq = ints[2];
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for (i = 0; i < NO_BASES; ++i)
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if (bases[i].address == ints[1]) {
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bases[i].noauto = 1;
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break;
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}
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++commandline_current;
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}
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}
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#endif
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/*
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* Function : int dtc_detect(struct scsi_host_template * tpnt)
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*
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* Purpose : detects and initializes DTC 3180/3280 controllers
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* that were autoprobed, overridden on the LILO command line,
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* or specified at compile time.
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*
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* Inputs : tpnt - template for this SCSI adapter.
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*
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* Returns : 1 if a host adapter was found, 0 if not.
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*
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*/
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static int __init dtc_detect(struct scsi_host_template * tpnt)
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{
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static int current_override = 0, current_base = 0;
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struct Scsi_Host *instance;
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unsigned int addr;
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void __iomem *base;
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int sig, count;
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tpnt->proc_name = "dtc3x80";
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tpnt->proc_info = &dtc_proc_info;
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for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
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addr = 0;
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base = NULL;
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if (overrides[current_override].address) {
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addr = overrides[current_override].address;
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base = ioremap(addr, 0x2000);
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if (!base)
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addr = 0;
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} else
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for (; !addr && (current_base < NO_BASES); ++current_base) {
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#if (DTCDEBUG & DTCDEBUG_INIT)
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printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
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#endif
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if (bases[current_base].noauto)
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continue;
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base = ioremap(bases[current_base].address, 0x2000);
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if (!base)
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continue;
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for (sig = 0; sig < NO_SIGNATURES; ++sig) {
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if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
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addr = bases[current_base].address;
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#if (DTCDEBUG & DTCDEBUG_INIT)
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printk(KERN_DEBUG "scsi-dtc : detected board.\n");
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#endif
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goto found;
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}
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}
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iounmap(base);
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}
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#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
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printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
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#endif
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if (!addr)
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break;
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found:
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instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
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if (instance == NULL)
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break;
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instance->base = addr;
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((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
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NCR5380_init(instance, 0);
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NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
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if (overrides[current_override].irq != IRQ_AUTO)
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instance->irq = overrides[current_override].irq;
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else
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instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
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#ifndef DONT_USE_INTR
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/* With interrupts enabled, it will sometimes hang when doing heavy
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* reads. So better not enable them until I finger it out. */
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if (instance->irq != SCSI_IRQ_NONE)
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if (request_irq(instance->irq, dtc_intr, IRQF_DISABLED,
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"dtc", instance)) {
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printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
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instance->irq = SCSI_IRQ_NONE;
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}
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if (instance->irq == SCSI_IRQ_NONE) {
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printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
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printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
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}
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#else
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if (instance->irq != SCSI_IRQ_NONE)
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printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
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instance->irq = SCSI_IRQ_NONE;
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#endif
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#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
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printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
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#endif
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printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
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if (instance->irq == SCSI_IRQ_NONE)
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printk(" interrupts disabled");
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else
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printk(" irq %d", instance->irq);
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printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
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NCR5380_print_options(instance);
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printk("\n");
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++current_override;
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++count;
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}
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return count;
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}
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/*
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* Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
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*
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* Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
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* the specified device / size.
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*
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* Inputs : size = size of device in sectors (512 bytes), dev = block device
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* major / minor, ip[] = {heads, sectors, cylinders}
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*
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* Returns : always 0 (success), initializes ip
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*
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*/
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/*
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* XXX Most SCSI boards use this mapping, I could be incorrect. Some one
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* using hard disks on a trantor should verify that this mapping corresponds
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* to that used by the BIOS / ASPI driver by running the linux fdisk program
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* and matching the H_C_S coordinates to what DOS uses.
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*/
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static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
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sector_t capacity, int *ip)
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{
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int size = capacity;
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ip[0] = 64;
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ip[1] = 32;
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ip[2] = size >> 11;
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return 0;
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}
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/****************************************************************
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* Function : int NCR5380_pread (struct Scsi_Host *instance,
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* unsigned char *dst, int len)
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*
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* Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
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* dst
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*
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* Inputs : dst = destination, len = length in bytes
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*
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* Returns : 0 on success, non zero on a failure such as a watchdog
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* timeout.
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*/
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static int dtc_maxi = 0;
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static int dtc_wmaxi = 0;
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static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
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{
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unsigned char *d = dst;
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int i; /* For counting time spent in the poll-loop */
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NCR5380_local_declare();
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NCR5380_setup(instance);
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i = 0;
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NCR5380_read(RESET_PARITY_INTERRUPT_REG);
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NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
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if (instance->irq == SCSI_IRQ_NONE)
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NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
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else
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NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
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NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
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rtrc(1);
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while (len > 0) {
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rtrc(2);
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while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
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++i;
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rtrc(3);
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memcpy_fromio(d, base + DTC_DATA_BUF, 128);
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d += 128;
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len -= 128;
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rtrc(7);
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/*** with int's on, it sometimes hangs after here.
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* Looks like something makes HBNR go away. */
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}
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rtrc(4);
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while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
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++i;
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NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
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rtrc(0);
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NCR5380_read(RESET_PARITY_INTERRUPT_REG);
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if (i > dtc_maxi)
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dtc_maxi = i;
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return (0);
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}
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/****************************************************************
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* Function : int NCR5380_pwrite (struct Scsi_Host *instance,
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* unsigned char *src, int len)
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*
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* Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
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* src
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*
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* Inputs : src = source, len = length in bytes
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*
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* Returns : 0 on success, non zero on a failure such as a watchdog
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* timeout.
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*/
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static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
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{
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int i;
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NCR5380_local_declare();
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NCR5380_setup(instance);
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NCR5380_read(RESET_PARITY_INTERRUPT_REG);
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NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
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/* set direction (write) */
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if (instance->irq == SCSI_IRQ_NONE)
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NCR5380_write(DTC_CONTROL_REG, 0);
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else
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NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
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NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
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for (i = 0; len > 0; ++i) {
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rtrc(5);
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/* Poll until the host buffer can accept data. */
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while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
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++i;
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rtrc(3);
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memcpy_toio(base + DTC_DATA_BUF, src, 128);
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src += 128;
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len -= 128;
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}
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rtrc(4);
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while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
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++i;
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rtrc(6);
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/* Wait until the last byte has been sent to the disk */
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while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
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++i;
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rtrc(7);
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/* Check for parity error here. fixme. */
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NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
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rtrc(0);
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if (i > dtc_wmaxi)
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dtc_wmaxi = i;
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return (0);
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}
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MODULE_LICENSE("GPL");
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#include "NCR5380.c"
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static int dtc_release(struct Scsi_Host *shost)
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{
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NCR5380_local_declare();
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NCR5380_setup(shost);
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if (shost->irq)
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free_irq(shost->irq, shost);
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NCR5380_exit(shost);
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if (shost->io_port && shost->n_io_port)
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release_region(shost->io_port, shost->n_io_port);
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scsi_unregister(shost);
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iounmap(base);
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return 0;
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}
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static struct scsi_host_template driver_template = {
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.name = "DTC 3180/3280 ",
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.detect = dtc_detect,
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.release = dtc_release,
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.queuecommand = dtc_queue_command,
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.eh_abort_handler = dtc_abort,
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.eh_bus_reset_handler = dtc_bus_reset,
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.bios_param = dtc_biosparam,
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.can_queue = CAN_QUEUE,
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.this_id = 7,
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.sg_tablesize = SG_ALL,
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.cmd_per_lun = CMD_PER_LUN,
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.use_clustering = DISABLE_CLUSTERING,
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};
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#include "scsi_module.c"
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