272 строки
6.4 KiB
C
272 строки
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/zorro.h>
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#include <linux/module.h>
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#include <asm/page.h>
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#include <asm/amigaints.h>
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#include <asm/amigahw.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_tcq.h>
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#include "wd33c93.h"
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#include "a2091.h"
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struct a2091_hostdata {
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struct WD33C93_hostdata wh;
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struct a2091_scsiregs *regs;
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};
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static irqreturn_t a2091_intr(int irq, void *data)
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{
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struct Scsi_Host *instance = data;
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struct a2091_hostdata *hdata = shost_priv(instance);
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unsigned int status = hdata->regs->ISTR;
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unsigned long flags;
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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(struct scsi_cmnd *cmd, int dir_in)
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{
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struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
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struct Scsi_Host *instance = cmd->device->host;
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struct a2091_hostdata *hdata = shost_priv(instance);
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struct WD33C93_hostdata *wh = &hdata->wh;
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struct a2091_scsiregs *regs = hdata->regs;
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unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
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unsigned long addr = virt_to_bus(scsi_pointer->ptr);
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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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wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff;
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wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
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GFP_KERNEL);
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/* can't allocate memory; use PIO */
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if (!wh->dma_bounce_buffer) {
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wh->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(wh->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(wh->dma_bounce_buffer);
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wh->dma_bounce_buffer = NULL;
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wh->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(wh->dma_bounce_buffer, scsi_pointer->ptr,
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scsi_pointer->this_residual);
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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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wh->dma_dir = dir_in;
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regs->CNTR = cntr;
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/* setup DMA *physical* address */
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regs->ACR = addr;
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if (dir_in) {
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/* invalidate any cache */
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cache_clear(addr, scsi_pointer->this_residual);
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} else {
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/* push any dirty cache */
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cache_push(addr, scsi_pointer->this_residual);
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}
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/* start DMA */
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regs->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, struct scsi_cmnd *SCpnt,
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int status)
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{
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struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt);
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struct a2091_hostdata *hdata = shost_priv(instance);
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struct WD33C93_hostdata *wh = &hdata->wh;
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struct a2091_scsiregs *regs = hdata->regs;
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/* disable SCSI interrupts */
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unsigned short cntr = CNTR_PDMD;
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if (!wh->dma_dir)
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cntr |= CNTR_DDIR;
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/* disable SCSI interrupts */
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regs->CNTR = cntr;
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/* flush if we were reading */
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if (wh->dma_dir) {
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regs->FLUSH = 1;
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while (!(regs->ISTR & ISTR_FE_FLG))
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;
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}
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/* clear a possible interrupt */
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regs->CINT = 1;
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/* stop DMA */
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regs->SP_DMA = 1;
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/* restore the CONTROL bits (minus the direction flag) */
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regs->CNTR = CNTR_PDMD | CNTR_INTEN;
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/* copy from a bounce buffer, if necessary */
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if (status && wh->dma_bounce_buffer) {
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if (wh->dma_dir)
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memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
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scsi_pointer->this_residual);
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kfree(wh->dma_bounce_buffer);
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wh->dma_bounce_buffer = NULL;
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wh->dma_bounce_len = 0;
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}
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}
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static struct scsi_host_template a2091_scsi_template = {
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.module = THIS_MODULE,
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.name = "Commodore A2091/A590 SCSI",
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.show_info = wd33c93_show_info,
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.write_info = wd33c93_write_info,
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.proc_name = "A2901",
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.queuecommand = wd33c93_queuecommand,
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.eh_abort_handler = wd33c93_abort,
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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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.dma_boundary = PAGE_SIZE - 1,
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.cmd_size = sizeof(struct scsi_pointer),
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};
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static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
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{
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struct Scsi_Host *instance;
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int error;
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struct a2091_scsiregs *regs;
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wd33c93_regs wdregs;
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struct a2091_hostdata *hdata;
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if (!request_mem_region(z->resource.start, 256, "wd33c93"))
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return -EBUSY;
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instance = scsi_host_alloc(&a2091_scsi_template,
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sizeof(struct a2091_hostdata));
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if (!instance) {
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error = -ENOMEM;
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goto fail_alloc;
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}
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instance->irq = IRQ_AMIGA_PORTS;
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instance->unique_id = z->slotaddr;
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regs = ZTWO_VADDR(z->resource.start);
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regs->DAWR = DAWR_A2091;
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wdregs.SASR = ®s->SASR;
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wdregs.SCMD = ®s->SCMD;
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hdata = shost_priv(instance);
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hdata->wh.no_sync = 0xff;
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hdata->wh.fast = 0;
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hdata->wh.dma_mode = CTRL_DMA;
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hdata->regs = regs;
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wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
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error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
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"A2091 SCSI", instance);
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if (error)
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goto fail_irq;
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regs->CNTR = CNTR_PDMD | CNTR_INTEN;
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error = scsi_add_host(instance, NULL);
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if (error)
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goto fail_host;
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zorro_set_drvdata(z, instance);
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scsi_scan_host(instance);
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return 0;
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fail_host:
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free_irq(IRQ_AMIGA_PORTS, instance);
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fail_irq:
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scsi_host_put(instance);
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fail_alloc:
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release_mem_region(z->resource.start, 256);
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return error;
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}
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static void a2091_remove(struct zorro_dev *z)
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{
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struct Scsi_Host *instance = zorro_get_drvdata(z);
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struct a2091_hostdata *hdata = shost_priv(instance);
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hdata->regs->CNTR = 0;
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scsi_remove_host(instance);
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free_irq(IRQ_AMIGA_PORTS, instance);
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scsi_host_put(instance);
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release_mem_region(z->resource.start, 256);
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}
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static struct zorro_device_id a2091_zorro_tbl[] = {
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{ ZORRO_PROD_CBM_A590_A2091_1 },
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{ ZORRO_PROD_CBM_A590_A2091_2 },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
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static struct zorro_driver a2091_driver = {
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.name = "a2091",
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.id_table = a2091_zorro_tbl,
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.probe = a2091_probe,
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.remove = a2091_remove,
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};
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static int __init a2091_init(void)
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{
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return zorro_register_driver(&a2091_driver);
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}
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module_init(a2091_init);
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static void __exit a2091_exit(void)
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{
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zorro_unregister_driver(&a2091_driver);
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}
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module_exit(a2091_exit);
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MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
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MODULE_LICENSE("GPL");
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