a2091.c 6.52 KB
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#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
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#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/zorro.h>
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#include <linux/module.h>
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#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>

#include "scsi.h"
#include "wd33c93.h"
#include "a2091.h"

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struct a2091_hostdata {
	struct WD33C93_hostdata wh;
	struct a2091_scsiregs *regs;
};

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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);
	unsigned int status = hdata->regs->ISTR;
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	unsigned long flags;

	if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
		return IRQ_NONE;

	spin_lock_irqsave(instance->host_lock, flags);
	wd33c93_intr(instance);
	spin_unlock_irqrestore(instance->host_lock, flags);
	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);
	struct WD33C93_hostdata *wh = &hdata->wh;
	struct a2091_scsiregs *regs = hdata->regs;
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	unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
	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;
		wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
						GFP_KERNEL);
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		/* can't allocate memory; use PIO */
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		if (!wh->dma_bounce_buffer) {
			wh->dma_bounce_len = 0;
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			return 1;
		}

		/* 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 */
		if (addr & A2091_XFER_MASK) {
			/* we could use chipmem... maybe later */
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			kfree(wh->dma_bounce_buffer);
			wh->dma_bounce_buffer = NULL;
			wh->dma_bounce_len = 0;
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			return 1;
		}

		if (!dir_in) {
			/* 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 */
	if (!dir_in)
		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) {
		/* invalidate any cache */
		cache_clear(addr, cmd->SCp.this_residual);
	} else {
		/* push any dirty cache */
		cache_push(addr, cmd->SCp.this_residual);
	}
	/* start DMA */
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	regs->ST_DMA = 1;
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	/* return success */
	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);
	struct WD33C93_hostdata *wh = &hdata->wh;
	struct a2091_scsiregs *regs = hdata->regs;
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	/* disable SCSI interrupts */
	unsigned short cntr = CNTR_PDMD;

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	if (!wh->dma_dir)
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		cntr |= CNTR_DDIR;

	/* 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;
		while (!(regs->ISTR & ISTR_FE_FLG))
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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) {
		if (wh->dma_dir)
			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);
		wh->dma_bounce_buffer = NULL;
		wh->dma_bounce_len = 0;
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	}
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}

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static int a2091_bus_reset(struct scsi_cmnd *cmd)
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{
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	struct Scsi_Host *instance = cmd->device->host;

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	/* FIXME perform bus-specific reset */
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	/* FIXME 2: kill this function, and let midlayer fall back
	   to the same action, calling wd33c93_host_reset() */

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	spin_lock_irq(instance->host_lock);
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	wd33c93_host_reset(cmd);
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	spin_unlock_irq(instance->host_lock);
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	return SUCCESS;
}

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static struct scsi_host_template a2091_scsi_template = {
	.module			= THIS_MODULE,
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	.name			= "Commodore A2091/A590 SCSI",
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	.show_info		= wd33c93_show_info,
	.write_info		= wd33c93_write_info,
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	.proc_name		= "A2901",
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	.queuecommand		= wd33c93_queuecommand,
	.eh_abort_handler	= wd33c93_abort,
	.eh_bus_reset_handler	= a2091_bus_reset,
	.eh_host_reset_handler	= wd33c93_host_reset,
	.can_queue		= CAN_QUEUE,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= CMD_PER_LUN,
	.use_clustering		= DISABLE_CLUSTERING
};

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static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
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{
	struct Scsi_Host *instance;
	int error;
	struct a2091_scsiregs *regs;
	wd33c93_regs wdregs;
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	struct a2091_hostdata *hdata;
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	if (!request_mem_region(z->resource.start, 256, "wd33c93"))
		return -EBUSY;

	instance = scsi_host_alloc(&a2091_scsi_template,
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				   sizeof(struct a2091_hostdata));
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	if (!instance) {
		error = -ENOMEM;
		goto fail_alloc;
	}

	instance->irq = IRQ_AMIGA_PORTS;
	instance->unique_id = z->slotaddr;

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	regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
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	regs->DAWR = DAWR_A2091;

	wdregs.SASR = &regs->SASR;
	wdregs.SCMD = &regs->SCMD;
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	hdata = shost_priv(instance);
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	hdata->wh.no_sync = 0xff;
	hdata->wh.fast = 0;
	hdata->wh.dma_mode = CTRL_DMA;
	hdata->regs = regs;
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	wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
	error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
			    "A2091 SCSI", instance);
	if (error)
		goto fail_irq;

	regs->CNTR = CNTR_PDMD | CNTR_INTEN;

	error = scsi_add_host(instance, NULL);
	if (error)
		goto fail_host;

	zorro_set_drvdata(z, instance);

	scsi_scan_host(instance);
	return 0;
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fail_host:
	free_irq(IRQ_AMIGA_PORTS, instance);
fail_irq:
	scsi_host_put(instance);
fail_alloc:
	release_mem_region(z->resource.start, 256);
	return error;
}

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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);
	release_mem_region(z->resource.start, 256);
}

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static struct zorro_device_id a2091_zorro_tbl[] = {
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	{ ZORRO_PROD_CBM_A590_A2091_1 },
	{ ZORRO_PROD_CBM_A590_A2091_2 },
	{ 0 }
};
MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);

static struct zorro_driver a2091_driver = {
	.name		= "a2091",
	.id_table	= a2091_zorro_tbl,
	.probe		= a2091_probe,
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	.remove		= a2091_remove,
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};

static int __init a2091_init(void)
{
	return zorro_register_driver(&a2091_driver);
}
module_init(a2091_init);

static void __exit a2091_exit(void)
{
	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");