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linux-stable/drivers/scsi/dtc.c
Finn Thain 22f5f10d2d ncr5380: Fix SCSI_IRQ_NONE bugs 
Oak scsi doesn't use any IRQ, but it sets irq = IRQ_NONE rather than
SCSI_IRQ_NONE. Problem is, the core NCR5380 driver expects SCSI_IRQ_NONE
if it is to issue IDENTIFY commands that prevent target disconnection.
And, as Geert points out, IRQ_NONE is part of enum irqreturn.

Other drivers, when they can't get an IRQ or can't use one, will set
host->irq = SCSI_IRQ_NONE (that is, 255). But when they exit they will
attempt to free IRQ 255 which was never requested.

Fix these bugs by using NO_IRQ in place of SCSI_IRQ_NONE and IRQ_NONE.
That means IRQ 0 is no longer probed by ISA drivers but I don't think
this matters.

Setting IRQ = 255 for these ISA drivers is understood to mean no IRQ.
This remains supported so as to avoid breaking existing ISA setups (which
can be difficult to get working) and because existing documentation
(SANE, TLDP etc) describes this usage for the ISA NCR5380 driver options.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2014-11-20 09:11:07 +01:00

474 lines
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#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
*
* DISTRIBUTION RELEASE 1.
*/
/*
* 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.h"
#include <scsi/scsi_host.h>
#include "dtc.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"
#define DTC_PUBLIC_RELEASE 2
/*
* 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
printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
if (instance->irq == NO_IRQ)
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 == 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 > 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 == 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 > 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 != 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,
.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"
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