mirror of
https://github.com/torvalds/linux.git
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267 lines
6.8 KiB
C
267 lines
6.8 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/sched.h>
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#include <linux/init.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 <linux/zorro.h>
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#include <asm/irq.h>
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#include <linux/spinlock.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 "a2091.h"
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#include<linux/stat.h>
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#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
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#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
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static irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp)
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{
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unsigned long flags;
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unsigned int status;
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struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
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status = DMA(instance)->ISTR;
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if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS))
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return IRQ_NONE;
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spin_lock_irqsave(instance->host_lock, flags);
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wd33c93_intr(instance);
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spin_unlock_irqrestore(instance->host_lock, flags);
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return IRQ_HANDLED;
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}
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static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
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{
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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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struct Scsi_Host *instance = cmd->device->host;
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/* don't allow DMA if the physical address is bad */
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if (addr & A2091_XFER_MASK ||
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(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
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{
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HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
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& ~0x1ff;
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HDATA(instance)->dma_bounce_buffer =
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kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL);
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/* can't allocate memory; use PIO */
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if (!HDATA(instance)->dma_bounce_buffer) {
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HDATA(instance)->dma_bounce_len = 0;
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return 1;
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}
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/* get the physical address of the bounce buffer */
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addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
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/* the bounce buffer may not be in the first 16M of physmem */
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if (addr & A2091_XFER_MASK) {
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/* we could use chipmem... maybe later */
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kfree (HDATA(instance)->dma_bounce_buffer);
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HDATA(instance)->dma_bounce_buffer = NULL;
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HDATA(instance)->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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if (cmd->use_sg)
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#if 0
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panic ("scsi%ddma: incomplete s/g support",
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instance->host_no);
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#else
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memcpy (HDATA(instance)->dma_bounce_buffer,
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cmd->SCp.ptr, cmd->SCp.this_residual);
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#endif
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else
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memcpy (HDATA(instance)->dma_bounce_buffer,
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cmd->request_buffer, cmd->request_bufflen);
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}
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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(cmd->device->host)->dma_dir = dir_in;
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DMA(cmd->device->host)->CNTR = cntr;
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/* setup DMA *physical* address */
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DMA(cmd->device->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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DMA(cmd->device->host)->ST_DMA = 1;
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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, Scsi_Cmnd *SCpnt,
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int status)
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{
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/* disable SCSI interrupts */
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unsigned short cntr = CNTR_PDMD;
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if (!HDATA(instance)->dma_dir)
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cntr |= CNTR_DDIR;
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/* disable SCSI interrupts */
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DMA(instance)->CNTR = cntr;
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/* flush if we were reading */
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if (HDATA(instance)->dma_dir) {
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DMA(instance)->FLUSH = 1;
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while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
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;
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}
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/* clear a possible interrupt */
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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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/* restore the CONTROL bits (minus the direction flag) */
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DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
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/* copy from a bounce buffer, if necessary */
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if (status && HDATA(instance)->dma_bounce_buffer) {
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if (SCpnt && SCpnt->use_sg) {
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#if 0
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panic ("scsi%d: incomplete s/g support",
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instance->host_no);
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#else
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if( HDATA(instance)->dma_dir )
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memcpy (SCpnt->SCp.ptr,
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HDATA(instance)->dma_bounce_buffer,
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SCpnt->SCp.this_residual);
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kfree (HDATA(instance)->dma_bounce_buffer);
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HDATA(instance)->dma_bounce_buffer = NULL;
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HDATA(instance)->dma_bounce_len = 0;
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#endif
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} else {
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if (HDATA(instance)->dma_dir && SCpnt)
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memcpy (SCpnt->request_buffer,
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HDATA(instance)->dma_bounce_buffer,
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SCpnt->request_bufflen);
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kfree (HDATA(instance)->dma_bounce_buffer);
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HDATA(instance)->dma_bounce_buffer = NULL;
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HDATA(instance)->dma_bounce_len = 0;
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}
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}
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}
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int __init a2091_detect(struct scsi_host_template *tpnt)
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{
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static unsigned char called = 0;
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struct Scsi_Host *instance;
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unsigned long address;
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struct zorro_dev *z = NULL;
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wd33c93_regs regs;
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int num_a2091 = 0;
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if (!MACH_IS_AMIGA || called)
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return 0;
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called = 1;
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tpnt->proc_name = "A2091";
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tpnt->proc_info = &wd33c93_proc_info;
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while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
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if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
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z->id != ZORRO_PROD_CBM_A590_A2091_2)
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continue;
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address = z->resource.start;
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if (!request_mem_region(address, 256, "wd33c93"))
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continue;
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instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
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if (instance == NULL) {
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release_mem_region(address, 256);
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continue;
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}
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instance->base = ZTWO_VADDR(address);
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instance->irq = IRQ_AMIGA_PORTS;
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instance->unique_id = z->slotaddr;
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DMA(instance)->DAWR = DAWR_A2091;
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regs.SASR = &(DMA(instance)->SASR);
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regs.SCMD = &(DMA(instance)->SCMD);
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wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
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request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",
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instance);
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DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
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num_a2091++;
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}
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return num_a2091;
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}
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static int a2091_bus_reset(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 fall back
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to the same action, 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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static struct scsi_host_template driver_template = {
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.proc_name = "A2901",
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.name = "Commodore A2091/A590 SCSI",
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.detect = a2091_detect,
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.release = a2091_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 = a2091_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 = DISABLE_CLUSTERING
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};
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#include "scsi_module.c"
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int a2091_release(struct Scsi_Host *instance)
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{
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#ifdef MODULE
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DMA(instance)->CNTR = 0;
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release_mem_region(ZTWO_PADDR(instance->base), 256);
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free_irq(IRQ_AMIGA_PORTS, instance);
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wd33c93_release();
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#endif
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return 1;
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}
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MODULE_LICENSE("GPL");
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