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linux/drivers/scsi/sgiwd93.c

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
* Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
* Copyright (C) 2001 Florian Lohoff (flo@rfc822.org)
* Copyright (C) 2003 Ralf Baechle (ralf@linux-mips.org)
*
* (In all truth, Jed Schimmel wrote all this code.)
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sgialib.h>
#include <asm/sgi/sgi.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/ip22.h>
#include <asm/irq.h>
#include <asm/io.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include <linux/stat.h>
#if 0
#define DPRINTK(args...) printk(args)
#else
#define DPRINTK(args...)
#endif
#define HDATA(ptr) ((struct ip22_hostdata *)((ptr)->hostdata))
struct ip22_hostdata {
struct WD33C93_hostdata wh;
struct hpc_data {
dma_addr_t dma;
void * cpu;
} hd;
};
struct hpc_chunk {
struct hpc_dma_desc desc;
u32 _padding; /* align to quadword boundary */
};
struct Scsi_Host *sgiwd93_host;
struct Scsi_Host *sgiwd93_host1;
/* Wuff wuff, wuff, wd33c93.c, wuff wuff, object oriented, bow wow. */
static inline void write_wd33c93_count(const wd33c93_regs regs,
unsigned long value)
{
*regs.SASR = WD_TRANSFER_COUNT_MSB;
mb();
*regs.SCMD = ((value >> 16) & 0xff);
*regs.SCMD = ((value >> 8) & 0xff);
*regs.SCMD = ((value >> 0) & 0xff);
mb();
}
static inline unsigned long read_wd33c93_count(const wd33c93_regs regs)
{
unsigned long value;
*regs.SASR = WD_TRANSFER_COUNT_MSB;
mb();
value = ((*regs.SCMD & 0xff) << 16);
value |= ((*regs.SCMD & 0xff) << 8);
value |= ((*regs.SCMD & 0xff) << 0);
mb();
return value;
}
static irqreturn_t sgiwd93_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct Scsi_Host * host = (struct Scsi_Host *) dev_id;
unsigned long flags;
spin_lock_irqsave(host->host_lock, flags);
wd33c93_intr(host);
spin_unlock_irqrestore(host->host_lock, flags);
return IRQ_HANDLED;
}
static inline
void fill_hpc_entries(struct hpc_chunk *hcp, struct scsi_cmnd *cmd, int datainp)
{
unsigned long len = cmd->SCp.this_residual;
void *addr = cmd->SCp.ptr;
dma_addr_t physaddr;
unsigned long count;
physaddr = dma_map_single(NULL, addr, len, cmd->sc_data_direction);
cmd->SCp.dma_handle = physaddr;
while (len) {
/*
* even cntinfo could be up to 16383, without
* magic only 8192 works correctly
*/
count = len > 8192 ? 8192 : len;
hcp->desc.pbuf = physaddr;
hcp->desc.cntinfo = count;
hcp++;
len -= count;
physaddr += count;
}
/*
* To make sure, if we trip an HPC bug, that we transfer every single
* byte, we tag on an extra zero length dma descriptor at the end of
* the chain.
*/
hcp->desc.pbuf = 0;
hcp->desc.cntinfo = HPCDMA_EOX;
}
static int dma_setup(struct scsi_cmnd *cmd, int datainp)
{
struct ip22_hostdata *hdata = HDATA(cmd->device->host);
struct hpc3_scsiregs *hregs =
(struct hpc3_scsiregs *) cmd->device->host->base;
struct hpc_chunk *hcp = (struct hpc_chunk *) hdata->hd.cpu;
DPRINTK("dma_setup: datainp<%d> hcp<%p> ", datainp, hcp);
hdata->wh.dma_dir = datainp;
/*
* wd33c93 shouldn't pass us bogus dma_setups, but it does:-( The
* other wd33c93 drivers deal with it the same way (which isn't that
* obvious). IMHO a better fix would be, not to do these dma setups
* in the first place.
*/
if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0)
return 1;
fill_hpc_entries(hcp, cmd, datainp);
DPRINTK(" HPCGO\n");
/* Start up the HPC. */
hregs->ndptr = hdata->hd.dma;
if (datainp)
hregs->ctrl = HPC3_SCTRL_ACTIVE;
else
hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR;
return 0;
}
static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
int status)
{
struct ip22_hostdata *hdata = HDATA(instance);
struct hpc3_scsiregs *hregs;
if (!SCpnt)
return;
hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base;
DPRINTK("dma_stop: status<%d> ", status);
/* First stop the HPC and flush it's FIFO. */
if (hdata->wh.dma_dir) {
hregs->ctrl |= HPC3_SCTRL_FLUSH;
while (hregs->ctrl & HPC3_SCTRL_ACTIVE)
barrier();
}
hregs->ctrl = 0;
dma_unmap_single(NULL, SCpnt->SCp.dma_handle, SCpnt->SCp.this_residual,
SCpnt->sc_data_direction);
DPRINTK("\n");
}
void sgiwd93_reset(unsigned long base)
{
struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base;
hregs->ctrl = HPC3_SCTRL_CRESET;
udelay(50);
hregs->ctrl = 0;
}
static inline void init_hpc_chain(struct hpc_data *hd)
{
struct hpc_chunk *hcp = (struct hpc_chunk *) hd->cpu;
struct hpc_chunk *dma = (struct hpc_chunk *) hd->dma;
unsigned long start, end;
start = (unsigned long) hcp;
end = start + PAGE_SIZE;
while (start < end) {
hcp->desc.pnext = (u32) (dma + 1);
hcp->desc.cntinfo = HPCDMA_EOX;
hcp++; dma++;
start += sizeof(struct hpc_chunk);
};
hcp--;
hcp->desc.pnext = hd->dma;
}
static struct Scsi_Host * __init sgiwd93_setup_scsi(
struct scsi_host_template *SGIblows, int unit, int irq,
struct hpc3_scsiregs *hregs, unsigned char *wdregs)
{
struct ip22_hostdata *hdata;
struct Scsi_Host *host;
wd33c93_regs regs;
host = scsi_register(SGIblows, sizeof(struct ip22_hostdata));
if (!host)
return NULL;
host->base = (unsigned long) hregs;
host->irq = irq;
hdata = HDATA(host);
hdata->hd.cpu = dma_alloc_coherent(NULL, PAGE_SIZE, &hdata->hd.dma,
GFP_KERNEL);
if (!hdata->hd.cpu) {
printk(KERN_WARNING "sgiwd93: Could not allocate memory for "
"host %d buffer.\n", unit);
goto out_unregister;
}
init_hpc_chain(&hdata->hd);
regs.SASR = wdregs + 3;
regs.SCMD = wdregs + 7;
wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_16_20);
hdata->wh.no_sync = 0;
if (request_irq(irq, sgiwd93_intr, 0, "SGI WD93", (void *) host)) {
printk(KERN_WARNING "sgiwd93: Could not register irq %d "
"for host %d.\n", irq, unit);
goto out_free;
}
return host;
out_free:
dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
wd33c93_release();
out_unregister:
scsi_unregister(host);
return NULL;
}
static int __init sgiwd93_detect(struct scsi_host_template *SGIblows)
{
int found = 0;
SGIblows->proc_name = "SGIWD93";
sgiwd93_host = sgiwd93_setup_scsi(SGIblows, 0, SGI_WD93_0_IRQ,
&hpc3c0->scsi_chan0,
(unsigned char *)hpc3c0->scsi0_ext);
if (sgiwd93_host)
found++;
/* Set up second controller on the Indigo2 */
if (ip22_is_fullhouse()) {
sgiwd93_host1 = sgiwd93_setup_scsi(SGIblows, 1, SGI_WD93_1_IRQ,
&hpc3c0->scsi_chan1,
(unsigned char *)hpc3c0->scsi1_ext);
if (sgiwd93_host1)
found++;
}
return found;
}
static int sgiwd93_release(struct Scsi_Host *instance)
{
struct ip22_hostdata *hdata = HDATA(instance);
int irq = 0;
if (sgiwd93_host && sgiwd93_host == instance)
irq = SGI_WD93_0_IRQ;
else if (sgiwd93_host1 && sgiwd93_host1 == instance)
irq = SGI_WD93_1_IRQ;
free_irq(irq, sgiwd93_intr);
dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
wd33c93_release();
return 1;
}
static int sgiwd93_bus_reset(struct scsi_cmnd *cmd)
{
/* FIXME perform bus-specific reset */
/* FIXME 2: kill this function, and let midlayer fallback
to the same result, calling wd33c93_host_reset() */
spin_lock_irq(cmd->device->host->host_lock);
wd33c93_host_reset(cmd);
spin_unlock_irq(cmd->device->host->host_lock);
return SUCCESS;
}
/*
* Kludge alert - the SCSI code calls the abort and reset method with int
* arguments not with pointers. So this is going to blow up beautyfully
* on 64-bit systems with memory outside the compat address spaces.
*/
static struct scsi_host_template driver_template = {
.proc_name = "SGIWD93",
.name = "SGI WD93",
.detect = sgiwd93_detect,
.release = sgiwd93_release,
.queuecommand = wd33c93_queuecommand,
.eh_abort_handler = wd33c93_abort,
.eh_bus_reset_handler = sgiwd93_bus_reset,
.eh_host_reset_handler = wd33c93_host_reset,
.can_queue = 16,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 8,
.use_clustering = DISABLE_CLUSTERING,
};
#include "scsi_module.c"
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