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264 lines
6.1 KiB
264 lines
6.1 KiB
// 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.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_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(cmd->SCp.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 = (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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/* 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, cmd->SCp.ptr, |
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cmd->SCp.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, 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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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 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(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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} |
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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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}; |
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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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