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/*
* linux/drivers/acorn/scsi/powertec.c
*
* Copyright (C) 1997-2005 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.
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include "../scsi.h"
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"
#include <scsi/scsicam.h>
#define POWERTEC_FAS216_OFFSET 0x3000
#define POWERTEC_FAS216_SHIFT 6
#define POWERTEC_INTR_STATUS 0x2000
#define POWERTEC_INTR_BIT 0x80
#define POWERTEC_RESET_CONTROL 0x1018
#define POWERTEC_RESET_BIT 1
#define POWERTEC_TERM_CONTROL 0x2018
#define POWERTEC_TERM_ENABLE 1
#define POWERTEC_INTR_CONTROL 0x101c
#define POWERTEC_INTR_ENABLE 1
#define POWERTEC_INTR_DISABLE 0
#define VERSION "1.10 (19/01/2003 2.5.59)"
/*
* Use term=0,1,0,0,0 to turn terminators on/off.
* One entry per slot.
*/
static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
#define NR_SG 256
struct powertec_info {
FAS216_Info info;
struct expansion_card *ec;
void __iomem *base;
unsigned int term_ctl;
struct scatterlist sg[NR_SG];
};
/* 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)
{
struct powertec_info *info = ec->irq_data;
writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
}
/* 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)
{
struct powertec_info *info = ec->irq_data;
writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
}
static const expansioncard_ops_t powertecscsi_ops = {
.irqenable = powertecscsi_irqenable,
.irqdisable = powertecscsi_irqdisable,
};
/* 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)
{
struct powertec_info *info = (struct powertec_info *)host->hostdata;
info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
}
/* 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)
*/
static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
{
struct powertec_info *info = dev_id;
return fas216_intr(&info->info);
}
/* 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, struct scsi_pointer *SCp,
fasdmadir_t direction, fasdmatype_t min_type)
{
struct powertec_info *info = (struct powertec_info *)host->hostdata;
struct device *dev = scsi_get_device(host);
int dmach = info->info.scsi.dma;
if (info->info.ifcfg.capabilities & FASCAP_DMA &&
min_type == fasdma_real_all) {
int bufs, map_dir, dma_dir;
bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
if (direction == DMA_OUT)
map_dir = DMA_TO_DEVICE,
dma_dir = DMA_MODE_WRITE;
else
map_dir = DMA_FROM_DEVICE,
dma_dir = DMA_MODE_READ;
dma_map_sg(dev, info->sg, bufs, map_dir);
disable_dma(dmach);
set_dma_sg(dmach, info->sg, bufs);
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, struct scsi_pointer *SCp)
{
struct powertec_info *info = (struct powertec_info *)host->hostdata;
if (info->info.scsi.dma != NO_DMA)
disable_dma(info->info.scsi.dma);
}
/* 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)
{
struct powertec_info *info = (struct powertec_info *)host->hostdata;
static char string[150];
sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
host->hostt->name, info->info.scsi.type, info->ec->slot_no,
VERSION, info->term_ctl ? "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 up to.
* length - length of buffer
* inout - 0 for reading, 1 for writing.
* Returns : length of data written to buffer.
*/
static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
{
struct powertec_info *info;
info = (struct powertec_info *)host->hostdata;
seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
fas216_print_host(&info->info, m);
seq_printf(m, "Term : o%s\n",
info->term_ctl ? "n" : "ff");
fas216_print_stats(&info->info, m);
fas216_print_devices(&info->info, m);
return 0;
}
static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
{
struct expansion_card *ec = ECARD_DEV(dev);
struct Scsi_Host *host = ecard_get_drvdata(ec);
struct powertec_info *info = (struct powertec_info *)host->hostdata;
return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
}
static ssize_t
powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
{
struct expansion_card *ec = ECARD_DEV(dev);
struct Scsi_Host *host = ecard_get_drvdata(ec);
if (len > 1)
powertecscsi_terminator_ctl(host, buf[0] != '0');
return len;
}
static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
powertecscsi_show_term, powertecscsi_store_term);
static struct scsi_host_template powertecscsi_template = {
.module = THIS_MODULE,
.show_info = powertecscsi_show_info,
.write_info = powertecscsi_set_proc_info<
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