270 lines
6.6 KiB
C
270 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/module.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 "scsi.h"
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#include "wd33c93.h"
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#include "a3000.h"
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struct a3000_hostdata {
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struct WD33C93_hostdata wh;
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struct a3000_scsiregs *regs;
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};
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static irqreturn_t a3000_intr(int irq, void *data)
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{
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struct Scsi_Host *instance = data;
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struct a3000_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_P))
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return IRQ_NONE;
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if (status & ISTR_INTS) {
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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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pr_warning("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 Scsi_Host *instance = cmd->device->host;
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struct a3000_hostdata *hdata = shost_priv(instance);
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struct WD33C93_hostdata *wh = &hdata->wh;
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struct a3000_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(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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wh->dma_bounce_len = (cmd->SCp.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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if (!dir_in) {
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/* copy to bounce buffer for a write */
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memcpy(wh->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(wh->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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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, 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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regs->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 a3000_hostdata *hdata = shost_priv(instance);
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struct WD33C93_hostdata *wh = &hdata->wh;
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struct a3000_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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regs->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 (wh->dma_dir) {
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regs->FLUSH = 1;
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mb(); /* don't allow prefetch */
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while (!(regs->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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regs->CINT = 1;
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/* stop DMA */
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regs->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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regs->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 && wh->dma_bounce_buffer) {
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if (SCpnt) {
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if (wh->dma_dir && SCpnt)
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memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
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SCpnt->SCp.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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} else {
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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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}
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static struct scsi_host_template amiga_a3000_scsi_template = {
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.module = THIS_MODULE,
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.name = "Amiga 3000 built-in 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 = "A3000",
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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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};
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static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct Scsi_Host *instance;
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int error;
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struct a3000_scsiregs *regs;
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wd33c93_regs wdregs;
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struct a3000_hostdata *hdata;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
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return -EBUSY;
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instance = scsi_host_alloc(&amiga_a3000_scsi_template,
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sizeof(struct a3000_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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regs = ZTWO_VADDR(res->start);
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regs->DAWR = DAWR_A3000;
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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_12_15);
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error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
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"A3000 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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platform_set_drvdata(pdev, 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(res->start, resource_size(res));
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return error;
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}
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static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
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{
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struct Scsi_Host *instance = platform_get_drvdata(pdev);
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struct a3000_hostdata *hdata = shost_priv(instance);
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struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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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(res->start, resource_size(res));
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return 0;
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}
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static struct platform_driver amiga_a3000_scsi_driver = {
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.remove = __exit_p(amiga_a3000_scsi_remove),
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.driver = {
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.name = "amiga-a3000-scsi",
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},
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};
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module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
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MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:amiga-a3000-scsi");
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