forked from luck/tmp_suning_uos_patched
2a3d4eb8e2
Most SCSI drivers want to enable "clustering", that is merging of segments so that they might span more than a single page. Remove the ENABLE_CLUSTERING define, and require drivers to explicitly set DISABLE_CLUSTERING to disable this feature. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#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/interrupt.h>
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#include <linux/init.h>
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#include <linux/kernel.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/mvme147hw.h>
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#include <asm/irq.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 "mvme147.h"
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static irqreturn_t mvme147_intr(int irq, void *data)
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{
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struct Scsi_Host *instance = data;
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if (irq == MVME147_IRQ_SCSI_PORT)
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wd33c93_intr(instance);
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else
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m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
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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 WD33C93_hostdata *hdata = shost_priv(instance);
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unsigned char flags = 0x01;
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unsigned long addr = virt_to_bus(cmd->SCp.ptr);
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/* setup dma direction */
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if (!dir_in)
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flags |= 0x04;
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/* remember direction */
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hdata->dma_dir = dir_in;
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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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m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
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m147_pcc->dma_dadr = addr;
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m147_pcc->dma_cntrl = flags;
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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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m147_pcc->dma_cntrl = 0;
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}
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static struct scsi_host_template mvme147_host_template = {
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.module = THIS_MODULE,
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.proc_name = "MVME147",
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.name = "MVME147 built-in SCSI",
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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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.show_info = wd33c93_show_info,
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.write_info = wd33c93_write_info,
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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 struct Scsi_Host *mvme147_shost;
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static int __init mvme147_init(void)
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{
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wd33c93_regs regs;
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struct WD33C93_hostdata *hdata;
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int error = -ENOMEM;
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if (!MACH_IS_MVME147)
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return 0;
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mvme147_shost = scsi_host_alloc(&mvme147_host_template,
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sizeof(struct WD33C93_hostdata));
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if (!mvme147_shost)
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goto err_out;
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mvme147_shost->base = 0xfffe4000;
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mvme147_shost->irq = MVME147_IRQ_SCSI_PORT;
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regs.SASR = (volatile unsigned char *)0xfffe4000;
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regs.SCMD = (volatile unsigned char *)0xfffe4001;
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hdata = shost_priv(mvme147_shost);
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hdata->no_sync = 0xff;
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hdata->fast = 0;
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hdata->dma_mode = CTRL_DMA;
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wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
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error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
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"MVME147 SCSI PORT", mvme147_shost);
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if (error)
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goto err_unregister;
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error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
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"MVME147 SCSI DMA", mvme147_shost);
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if (error)
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goto err_free_irq;
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#if 0 /* Disabled; causes problems booting */
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m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
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udelay(100);
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m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
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udelay(2000);
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m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
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#endif
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m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
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m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
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m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
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error = scsi_add_host(mvme147_shost, NULL);
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if (error)
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goto err_free_irq;
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scsi_scan_host(mvme147_shost);
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return 0;
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err_free_irq:
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free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
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err_unregister:
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scsi_host_put(mvme147_shost);
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err_out:
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return error;
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}
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static void __exit mvme147_exit(void)
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{
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scsi_remove_host(mvme147_shost);
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/* XXX Make sure DMA is stopped! */
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free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
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free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost);
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scsi_host_put(mvme147_shost);
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}
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module_init(mvme147_init);
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module_exit(mvme147_exit);
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