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/*
* linux/drivers/acorn/scsi/powertec.c
*
* Copyright (C) 1997-2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This driver is based on experimentation. Hence, it may have made
* assumptions about the particular card that I have available, and
* may not be reliable!
*
* Changelog:
* 01-10-1997 RMK Created, READONLY version.
* 15-02-1998 RMK Added DMA support and hardware definitions.
* 15-04-1998 RMK Only do PIO if FAS216 will allow it.
* 02-05-1998 RMK Moved DMA sg list into per-interface structure.
* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
* 02-04-2000 RMK Updated for new error handling code.
*/
#include <linux/module.h>
#include <linux/blk.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/unistd.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
#include "../../scsi/sd.h"
#include "../../scsi/hosts.h"
#include "fas216.h"
#include <scsi/scsicam.h>
/* Configuration */
#define POWERTEC_XTALFREQ 40
#define POWERTEC_ASYNC_PERIOD 200
#define POWERTEC_SYNC_DEPTH 7
/*
* List of devices that the driver will recognise
*/
#define POWERTECSCSI_LIST { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }
#define POWERTEC_FAS216_OFFSET 0xc00
#define POWERTEC_FAS216_SHIFT 4
#define POWERTEC_INTR_STATUS 0x800
#define POWERTEC_INTR_BIT 0x80
#define POWERTEC_RESET_CONTROL 0x406
#define POWERTEC_RESET_BIT 1
#define POWERTEC_TERM_CONTROL 0x806
#define POWERTEC_TERM_ENABLE 1
#define POWERTEC_INTR_CONTROL 0x407
#define POWERTEC_INTR_ENABLE 1
#define POWERTEC_INTR_DISABLE 0
/*
* Version
*/
#define VER_MAJOR 0
#define VER_MINOR 0
#define VER_PATCH 5
static struct expansion_card *ecs[MAX_ECARDS];
/*
* Use term=0,1,0,0,0 to turn terminators on/off
*/
static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
#define NR_SG 256
typedef struct {
FAS216_Info info;
struct {
unsigned int term_port;
unsigned int terms;
} control;
/* other info... */
struct scatterlist sg[NR_SG]; /* Scatter DMA list */
} PowerTecScsi_Info;
/* Prototype: void powertecscsi_irqenable(ec, irqnr)
* Purpose : Enable interrupts on Powertec SCSI card
* Params : ec - expansion card structure
* : irqnr - interrupt number
*/
static void
powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
{
unsigned int port = (unsigned int)ec->irq_data;
outb(POWERTEC_INTR_ENABLE, port);
}
/* Prototype: void powertecscsi_irqdisable(ec, irqnr)
* Purpose : Disable interrupts on Powertec SCSI card
* Params : ec - expansion card structure
* : irqnr - interrupt number
*/
static void
powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
{
unsigned int port = (unsigned int)ec->irq_data;
outb(POWERTEC_INTR_DISABLE, port);
}
static const expansioncard_ops_t powertecscsi_ops = {
powertecscsi_irqenable,
powertecscsi_irqdisable,
NULL,
NULL,
NULL,
NULL
};
/* Prototype: void powertecscsi_terminator_ctl(host, on_off)
* Purpose : Turn the Powertec SCSI terminators on or off
* Params : host - card to turn on/off
* : on_off - !0 to turn on, 0 to turn off
*/
static void
powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
{
PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
if (on_off)
info->control.terms = POWERTEC_TERM_ENABLE;
else
info->control.terms = 0;
outb(info->control.terms, info->control.term_port);
}
/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
* Purpose : handle interrupts from Powertec SCSI card
* Params : irq - interrupt number
* dev_id - user-defined (Scsi_Host structure)
* regs - processor registers at interrupt
*/
static void
powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
fas216_intr(host);
}
/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
* Purpose : initialises DMA/PIO
* Params : host - host
* SCpnt - command
* direction - DMA on to/off of card
* min_type - minimum DMA support that we must have for this transfer
* Returns : type of transfer to be performed
*/
static fasdmatype_t
powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
fasdmadir_t direction, fasdmatype_t min_type)
{
PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
int dmach = host->dma_channel;
if (dmach != NO_DMA &&
(min_type == fasdma_real_all || SCp->this_residual >= 512)) {
int bufs = SCp->buffers_residual;
int pci_dir, dma_dir;
if (bufs)
memcpy(info->sg + 1, SCp->buffer + 1,
sizeof(struct scatterlist) * bufs);
info->sg[0].address = SCp->ptr;
info->sg[0].page = NULL;
info->sg[0].length = SCp->this_residual;
if (direction == DMA_OUT)
pci_dir = PCI_DMA_TODEVICE,
dma_dir = DMA_MODE_WRITE;
else
pci_dir = PCI_DMA_FROMDEVICE,
dma_dir = DMA_MODE_READ;
pci_map_sg(NULL, info->sg, bufs + 1, pci_dir);
disable_dma(dmach);
set_dma_sg(dmach, info->sg, bufs + 1);
set_dma_mode(dmach, dma_dir);
enable_dma(dmach);
return fasdma_real_all;
}
/*
* If we're not doing DMA,
* we'll do slow PIO
*/
return fasdma_pio;
}
/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
* Purpose : stops DMA/PIO
* Params : host - host
* SCpnt - command
*/
static void
powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
{
if (host->dma_channel != NO_DMA)
disable_dma(host->dma_channel);
}
/* Prototype: int powertecscsi_detect(Scsi_Host_Template * tpnt)
* Purpose : initialises PowerTec SCSI driver
* Params : tpnt - template for this SCSI adapter
* Returns : >0 if host found, 0 otherwise.
*/
int
powertecscsi_detect(Scsi_Host_Template *tpnt)
{
static const card_ids powertecscsi_cids[] =
{ POWERTECSCSI_LIST, { 0xffff, 0xffff} };
int count = 0;
struct Scsi_Host *host;
tpnt->proc_name = "powertec";
memset(ecs, 0, sizeof (ecs));
ecard_startfind();
while (1) {
PowerTecScsi_Info *info;
ecs[count] = ecard_find(0, powertecscsi_cids);
if (!ecs[count])
break;
ecard_claim(ecs[count]);
host = scsi_register(tpnt, sizeof (PowerTecScsi_Info));
if (!host) {
ecard_release(ecs[count]);
break;
}
host->io_port = ecard_address(ecs[count], ECARD_IOC, ECARD_FAST);
host->irq = ecs[count]->irq;
host->dma_channel = ecs[count]->dma;
info = (PowerTecScsi_Info *)host->hostdata;
if (host->dma_channel != NO_DMA)
set_dma_speed(host->dma_channel, 180);
info->control.term_port = host->io_port + POWERTEC_TERM_CONTROL;
info->control.terms = term[count] ? POWERTEC_TERM_ENABLE : 0;
powertecscsi_terminator_ctl(host, info->control.terms);
info->info.scsi.io_port =
host->io_port + POWERTEC_FAS216_OFFSET;
info->info.scsi.io_shift= POWERTEC_FAS216_SHIFT;
info->info.scsi.irq = host->irq;
info->info.ifcfg.clockrate = POWERTEC_XTALFREQ;
info->info.ifcfg.select_timeout = 255;
info->info.ifcfg.asyncperiod = POWERTEC_ASYNC_PERIOD;
info->info.ifcfg.sync_max_depth = POWERTEC_SYNC_DEPTH;
info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
info->info.ifcfg.disconnect_ok = 1;
info->info.ifcfg.wide_max_size = 0;
info->info.dma.setup = powertecscsi_dma_setup;
info->info.dma.pseudo = NULL;
info->info.dma.stop = powertecscsi_dma_stop;
ecs[count]->irqaddr = (unsigned char *)
ioaddr(host->io_port + POWERTEC_INTR_STATUS);
ecs[count]->irqmask = POWERTEC_INTR_BIT;
ecs[count]->irq_data = (void *)
(host->io_port + POWERTEC_INTR_CONTROL);
ecs[count]->ops = (expansioncard_ops_t *)&powertecscsi_ops;
request_region(host->io_port + POWERTEC_FAS216_OFFSET,
16 << POWERTEC_FAS216_SHIFT, "powertec2-fas");
if (host->irq != NO_IRQ &&
request_irq(host->irq, powertecscsi_intr,
SA_INTERRUPT, "powertec", host)) {
printk("scsi%d: IRQ%d not free, interrupts disabled\n",
host->host_no, host->irq);
host->irq = NO_IRQ;
info->info.scsi.irq = NO_IRQ;
}
if (host->dma_channel != NO_DMA &&
request_dma(host->dma_channel, "powertec")) {
printk("scsi%d: DMA%d not free, DMA disabled\n",
host->host_no, host->dma_channel);
host->dma_channel = NO_DMA;
}
fas216_init(host);
++count;
}
return count;
}
/* Prototype: int powertecscsi_release(struct Scsi_Host * host)
* Purpose : releases all resources used by this adapter
* Params : host - driver host structure to return info for.
*/
int powertecscsi_release(struct Scsi_Host *host)
{
int i;
fas216_release(host);
if (host->irq != NO_IRQ)
free_irq(host->irq, host);
if (host->dma_channel != NO_DMA)
free_dma(host->dma_channel);
release_region(host->io_port + POWERTEC_FAS216_OFFSET,
16 << POWERTEC_FAS216_SHIFT);
for (i = 0; i < MAX_ECARDS; i++)
if (ecs[i] &&
host->io_port == ecard_address(ecs[i], ECARD_IOC, ECARD_FAST))
ecard_release(ecs[i]);
return 0;
}
/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
* Purpose : returns a descriptive string about this interface,
* Params : host - driver host structure to return info for.
* Returns : pointer to a static buffer containing null terminated string.
*/
const char *powertecscsi_info(struct Scsi_Host *host)
{
PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
static char string[100], *p;
p = string;
p += sprintf(p, "%s ", host->hostt->name);
p += fas216_info(&info->info, p);
p += sprintf(p, "v%d.%d.%d terminators o%s",
VER_MAJOR, VER_MINOR, VER_PATCH,
info->control.terms ? "n" : "ff");
return string;
}
/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
* Purpose : Set a driver specific function
* Params : host - host to setup
* : buffer - buffer containing string describing operation
* : length - length of string
* Returns : -EINVAL, or 0
*/
static int
powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
{
int ret = length;
if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
buffer += 12;
length -= 12;
if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
if (buffer[5] == '1')
powertecscsi_terminator_ctl(host, 1);
else if (buffer[5] == '0')
powertecscsi_terminator_ctl(host, 0);
else
ret = -EINVAL;
} else
ret = -EINVAL;
} else
ret = -EINVAL;
return ret;
}
/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
* int length, int host_no, int inout)
* Purpose : Return information about the driver to a user process accessing
* the /proc filesystem.
* Params : buffer - a buffer to write information to
* start - a pointer into this buffer set by this routine to the start
* of the required information.
* offset - offset into information that we have read upto.
* length - length of buffer
* host_no - host number to return information for
* inout - 0 for reading, 1 for writing.
* Returns : length of data written to buffer.
*/
int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
int length, int host_no, int inout)
{
int pos, begin;
struct Scsi_Host *host = scsi_hostlist;
PowerTecScsi_Info *info;
Scsi_Device *scd;
while (host) {
if (host->host_no == host_no)
break;
host = host->next;
}
if (!host)
return 0;
if (inout == 1)
return powertecscsi_set_proc_info(host, buffer, length);
info = (PowerTecScsi_Info *)host->hostdata;
begin = 0;
pos = sprintf(buffer,
"PowerTec SCSI driver version %d.%d.%d\n",
VER_MAJOR, VER_MINOR, VER_PATCH);
pos += fas216_print_host(&info->info, buffer + pos);
pos += sprintf(buffer + pos, "Term : o%s\n",
info->control.terms ? "n" : "ff");
pos += fas216_print_stats(&info->info, buffer + pos);
pos += sprintf(buffer+pos, "\nAttached devices:\n");
for (scd = host->host_queue; scd; scd = scd->next) {
pos += fas216_print_device(&info->info, scd, buffer + pos);
if (pos + begin < offset) {
begin += pos;
pos = 0;
}
if (pos + begin > offset + length)
break;
}
*start = buffer + (offset - begin);
pos -= offset - begin;
if (pos > length)
pos = length;
return pos;
}
static Scsi_Host_Template powertecscsi_template = {
module: THIS_MODULE,
proc_info: powertecscsi_proc_info,
name: "PowerTec SCSI",
detect: powertecscsi_detect,
release: powertecscsi_release,
info: powertecscsi_info,
bios_param: scsicam_bios_param,
can_queue: 1,
this_id: 7,
sg_tablesize: SG_ALL,
cmd_per_lun: 1,
use_clustering: ENABLE_CLUSTERING,
command: fas216_command,
queuecommand: fas216_queue_command,
eh_host_reset_handler: fas216_eh_host_reset,
eh_bus_reset_handler: fas216_eh_bus_reset,
eh_device_reset_handler: fas216_eh_device_reset,
eh_abort_handler: fas216_eh_abort,
use_new_eh_code: 1
};
static int __init powertecscsi_init(void)
{
scsi_register_module(MODULE_SCSI_HA, &powertecscsi_template);
if (powertecscsi_template.present)
return 0;
scsi_unregister_module(MODULE_SCSI_HA, &powertecscsi_template);
return -ENODEV;
}
static void __exit powertecscsi_exit(void)
{
scsi_unregister_module(MODULE_SCSI_HA, &powertecscsi_template);
}
module_init(powertecscsi_init);
module_exit(powertecscsi_exit);
MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Powertec SCSI driver");
MODULE_PARM(term, "1-8i");
MODULE_PARM_DESC(term, "SCSI bus termination");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
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