diff options
Diffstat (limited to 'drivers/scsi/mvme147.c')
| -rw-r--r-- | drivers/scsi/mvme147.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/scsi/mvme147.c b/drivers/scsi/mvme147.c new file mode 100644 index 000000000..472fa0430 --- /dev/null +++ b/drivers/scsi/mvme147.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/blkdev.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include <asm/page.h> +#include <asm/mvme147hw.h> +#include <asm/irq.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_tcq.h> +#include "wd33c93.h" +#include "mvme147.h" + +static irqreturn_t mvme147_intr(int irq, void *data) +{ + struct Scsi_Host *instance = data; + + if (irq == MVME147_IRQ_SCSI_PORT) + wd33c93_intr(instance); + else + m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ + return IRQ_HANDLED; +} + +static int dma_setup(struct scsi_cmnd *cmd, int dir_in) +{ + struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); + struct Scsi_Host *instance = cmd->device->host; + struct WD33C93_hostdata *hdata = shost_priv(instance); + unsigned char flags = 0x01; + unsigned long addr = virt_to_bus(scsi_pointer->ptr); + + /* setup dma direction */ + if (!dir_in) + flags |= 0x04; + + /* remember direction */ + hdata->dma_dir = dir_in; + + if (dir_in) { + /* invalidate any cache */ + cache_clear(addr, scsi_pointer->this_residual); + } else { + /* push any dirty cache */ + cache_push(addr, scsi_pointer->this_residual); + } + + /* start DMA */ + m147_pcc->dma_bcr = scsi_pointer->this_residual | (1 << 24); + m147_pcc->dma_dadr = addr; + m147_pcc->dma_cntrl = flags; + + /* return success */ + return 0; +} + +static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, + int status) +{ + m147_pcc->dma_cntrl = 0; +} + +static struct scsi_host_template mvme147_host_template = { + .module = THIS_MODULE, + .proc_name = "MVME147", + .name = "MVME147 built-in SCSI", + .queuecommand = wd33c93_queuecommand, + .eh_abort_handler = wd33c93_abort, + .eh_host_reset_handler = wd33c93_host_reset, + .show_info = wd33c93_show_info, + .write_info = wd33c93_write_info, + .can_queue = CAN_QUEUE, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = CMD_PER_LUN, + .cmd_size = sizeof(struct scsi_pointer), +}; + +static struct Scsi_Host *mvme147_shost; + +static int __init mvme147_init(void) +{ + wd33c93_regs regs; + struct WD33C93_hostdata *hdata; + int error = -ENOMEM; + + if (!MACH_IS_MVME147) + return 0; + + mvme147_shost = scsi_host_alloc(&mvme147_host_template, + sizeof(struct WD33C93_hostdata)); + if (!mvme147_shost) + goto err_out; + mvme147_shost->base = 0xfffe4000; + mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; + + regs.SASR = (volatile unsigned char *)0xfffe4000; + regs.SCMD = (volatile unsigned char *)0xfffe4001; + + hdata = shost_priv(mvme147_shost); + hdata->no_sync = 0xff; + hdata->fast = 0; + hdata->dma_mode = CTRL_DMA; + + wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); + + error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, + "MVME147 SCSI PORT", mvme147_shost); + if (error) + goto err_unregister; + error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, + "MVME147 SCSI DMA", mvme147_shost); + if (error) + goto err_free_irq; +#if 0 /* Disabled; causes problems booting */ + m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ + udelay(100); + m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ + udelay(2000); + m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ +#endif + m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ + + m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ + m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ + + error = scsi_add_host(mvme147_shost, NULL); + if (error) + goto err_free_irq; + scsi_scan_host(mvme147_shost); + return 0; + +err_free_irq: + free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); +err_unregister: + scsi_host_put(mvme147_shost); +err_out: + return error; +} + +static void __exit mvme147_exit(void) +{ + scsi_remove_host(mvme147_shost); + + /* XXX Make sure DMA is stopped! */ + free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); + free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); + + scsi_host_put(mvme147_shost); +} + +module_init(mvme147_init); +module_exit(mvme147_exit); |