249 lines
6.0 KiB
C
249 lines
6.0 KiB
C
#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/amigaints.h>
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#include <asm/amigahw.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 "a3000.h"
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#include <linux/stat.h>
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#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
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static struct Scsi_Host *a3000_host = NULL;
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static int a3000_release(struct Scsi_Host *instance);
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static irqreturn_t a3000_intr(int irq, void *dummy)
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{
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unsigned long flags;
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unsigned int status = DMA(a3000_host)->ISTR;
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if (!(status & ISTR_INT_P))
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return IRQ_NONE;
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if (status & ISTR_INTS) {
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spin_lock_irqsave(a3000_host->host_lock, flags);
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wd33c93_intr(a3000_host);
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spin_unlock_irqrestore(a3000_host->host_lock, flags);
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return IRQ_HANDLED;
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}
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printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
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return IRQ_NONE;
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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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struct WD33C93_hostdata *hdata = shost_priv(a3000_host);
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unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
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unsigned long addr = virt_to_bus(cmd->SCp.ptr);
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/*
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* if the physical address has the wrong alignment, or if
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* physical address is bad, or if it is a write and at the
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* end of a physical memory chunk, then allocate a bounce
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* buffer
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*/
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if (addr & A3000_XFER_MASK) {
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hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
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hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
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GFP_KERNEL);
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/* can't allocate memory; use PIO */
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if (!hdata->dma_bounce_buffer) {
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hdata->dma_bounce_len = 0;
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return 1;
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}
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if (!dir_in) {
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/* copy to bounce buffer for a write */
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memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
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cmd->SCp.this_residual);
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}
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addr = virt_to_bus(hdata->dma_bounce_buffer);
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}
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/* setup dma direction */
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if (!dir_in)
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cntr |= CNTR_DDIR;
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/* remember direction */
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hdata->dma_dir = dir_in;
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DMA(a3000_host)->CNTR = cntr;
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/* setup DMA *physical* address */
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DMA(a3000_host)->ACR = addr;
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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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}
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/* start DMA */
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mb(); /* make sure setup is completed */
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DMA(a3000_host)->ST_DMA = 1;
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mb(); /* make sure DMA has started before next IO */
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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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struct WD33C93_hostdata *hdata = shost_priv(instance);
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/* disable SCSI interrupts */
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unsigned short cntr = CNTR_PDMD;
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if (!hdata->dma_dir)
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cntr |= CNTR_DDIR;
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DMA(instance)->CNTR = cntr;
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mb(); /* make sure CNTR is updated before next IO */
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/* flush if we were reading */
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if (hdata->dma_dir) {
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DMA(instance)->FLUSH = 1;
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mb(); /* don't allow prefetch */
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while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
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barrier();
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mb(); /* no IO until FLUSH is done */
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}
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/* clear a possible interrupt */
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/* I think that this CINT is only necessary if you are
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* using the terminal count features. HM 7 Mar 1994
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*/
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DMA(instance)->CINT = 1;
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/* stop DMA */
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DMA(instance)->SP_DMA = 1;
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mb(); /* make sure DMA is stopped before next IO */
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/* restore the CONTROL bits (minus the direction flag) */
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DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
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mb(); /* make sure CNTR is updated before next IO */
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/* copy from a bounce buffer, if necessary */
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if (status && hdata->dma_bounce_buffer) {
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if (SCpnt) {
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if (hdata->dma_dir && SCpnt)
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memcpy(SCpnt->SCp.ptr,
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hdata->dma_bounce_buffer,
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SCpnt->SCp.this_residual);
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kfree(hdata->dma_bounce_buffer);
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hdata->dma_bounce_buffer = NULL;
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hdata->dma_bounce_len = 0;
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} else {
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kfree(hdata->dma_bounce_buffer);
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hdata->dma_bounce_buffer = NULL;
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hdata->dma_bounce_len = 0;
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}
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}
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}
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static int __init a3000_detect(struct scsi_host_template *tpnt)
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{
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wd33c93_regs regs;
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struct WD33C93_hostdata *hdata;
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if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
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return 0;
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if (!request_mem_region(0xDD0000, 256, "wd33c93"))
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return 0;
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tpnt->proc_name = "A3000";
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tpnt->proc_info = &wd33c93_proc_info;
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a3000_host = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
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if (a3000_host == NULL)
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goto fail_register;
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a3000_host->base = ZTWO_VADDR(0xDD0000);
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a3000_host->irq = IRQ_AMIGA_PORTS;
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DMA(a3000_host)->DAWR = DAWR_A3000;
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regs.SASR = &(DMA(a3000_host)->SASR);
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regs.SCMD = &(DMA(a3000_host)->SCMD);
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hdata = shost_priv(a3000_host);
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hdata->no_sync = 0xff;
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hdata->fast = 0;
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hdata->dma_mode = CTRL_DMA;
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wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
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if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
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a3000_intr))
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goto fail_irq;
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DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
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return 1;
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fail_irq:
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scsi_unregister(a3000_host);
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fail_register:
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release_mem_region(0xDD0000, 256);
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return 0;
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}
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static int a3000_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 entire function, which should
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cause mid-layer to call wd33c93_host_reset anyway? */
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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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static struct scsi_host_template driver_template = {
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.proc_name = "A3000",
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.name = "Amiga 3000 built-in SCSI",
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.detect = a3000_detect,
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.release = a3000_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 = a3000_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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static int a3000_release(struct Scsi_Host *instance)
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{
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DMA(instance)->CNTR = 0;
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release_mem_region(0xDD0000, 256);
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free_irq(IRQ_AMIGA_PORTS, a3000_intr);
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return 1;
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}
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MODULE_LICENSE("GPL");
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