forked from luck/tmp_suning_uos_patched
be3cb3d84b
SGI machines with WD33C93 allow usage of burst mode DMA, which increases performance noticable. To make this selectable by the sgiwd93 stub, setting the values for no_sync, fast and dma_mode has been moved to the individual platform stubs. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/blkdev.h>
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#include <linux/interrupt.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/mvme147hw.h>
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#include <asm/irq.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include "wd33c93.h"
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#include "mvme147.h"
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#include<linux/stat.h>
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#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
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static struct Scsi_Host *mvme147_host = NULL;
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static irqreturn_t mvme147_intr (int irq, void *dummy)
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{
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if (irq == MVME147_IRQ_SCSI_PORT)
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wd33c93_intr (mvme147_host);
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else
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m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
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return IRQ_HANDLED;
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}
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static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
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{
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unsigned char flags = 0x01;
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unsigned long addr = virt_to_bus(cmd->SCp.ptr);
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/* setup dma direction */
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if (!dir_in)
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flags |= 0x04;
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/* remember direction */
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HDATA(mvme147_host)->dma_dir = dir_in;
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if (dir_in)
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/* invalidate any cache */
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cache_clear (addr, cmd->SCp.this_residual);
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else
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/* push any dirty cache */
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cache_push (addr, cmd->SCp.this_residual);
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/* start DMA */
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m147_pcc->dma_bcr = cmd->SCp.this_residual | (1<<24);
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m147_pcc->dma_dadr = addr;
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m147_pcc->dma_cntrl = flags;
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/* return success */
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return 0;
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}
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static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
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int status)
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{
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m147_pcc->dma_cntrl = 0;
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}
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int mvme147_detect(struct scsi_host_template *tpnt)
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{
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static unsigned char called = 0;
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wd33c93_regs regs;
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if (!MACH_IS_MVME147 || called)
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return 0;
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called++;
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tpnt->proc_name = "MVME147";
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tpnt->proc_info = &wd33c93_proc_info;
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mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
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if (!mvme147_host)
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goto err_out;
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mvme147_host->base = 0xfffe4000;
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mvme147_host->irq = MVME147_IRQ_SCSI_PORT;
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regs.SASR = (volatile unsigned char *)0xfffe4000;
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regs.SCMD = (volatile unsigned char *)0xfffe4001;
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HDATA(a3000_host)->no_sync = 0xff;
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HDATA(a3000_host)->fast = 0;
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HDATA(a3000_host)->dma_mode = CTRL_DMA;
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wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
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if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr))
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goto err_unregister;
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if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr))
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goto err_free_irq;
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#if 0 /* Disabled; causes problems booting */
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m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
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udelay(100);
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m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
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udelay(2000);
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m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
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#endif
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m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
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m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
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m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
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return 1;
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err_free_irq:
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free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
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err_unregister:
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wd33c93_release();
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scsi_unregister(mvme147_host);
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err_out:
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return 0;
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}
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static int mvme147_bus_reset(struct scsi_cmnd *cmd)
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{
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/* FIXME perform bus-specific reset */
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/* FIXME 2: kill this function, and let midlayer fallback to
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the same result, calling wd33c93_host_reset() */
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spin_lock_irq(cmd->device->host->host_lock);
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wd33c93_host_reset(cmd);
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spin_unlock_irq(cmd->device->host->host_lock);
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return SUCCESS;
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}
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#define HOSTS_C
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#include "mvme147.h"
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static struct scsi_host_template driver_template = {
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.proc_name = "MVME147",
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.name = "MVME147 built-in SCSI",
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.detect = mvme147_detect,
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.release = mvme147_release,
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.queuecommand = wd33c93_queuecommand,
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.eh_abort_handler = wd33c93_abort,
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.eh_bus_reset_handler = mvme147_bus_reset,
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.eh_host_reset_handler = wd33c93_host_reset,
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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 = ENABLE_CLUSTERING
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};
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#include "scsi_module.c"
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int mvme147_release(struct Scsi_Host *instance)
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{
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#ifdef MODULE
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/* XXX Make sure DMA is stopped! */
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wd33c93_release();
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free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
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free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
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#endif
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return 1;
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}
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