diff options
Diffstat (limited to 'drivers/scsi/mvme147.c')
| -rw-r--r-- | drivers/scsi/mvme147.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/scsi/mvme147.c b/drivers/scsi/mvme147.c new file mode 100644 index 000000000..e7f6661a8 --- /dev/null +++ b/drivers/scsi/mvme147.c @@ -0,0 +1,166 @@ +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/blkdev.h> +#include <linux/interrupt.h> + +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/mvme147hw.h> +#include <asm/irq.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "wd33c93.h" +#include "mvme147.h" + +#include <linux/stat.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_Host *instance = cmd->device->host; + struct WD33C93_hostdata *hdata = shost_priv(instance); + unsigned char flags = 0x01; + unsigned long addr = virt_to_bus(cmd->SCp.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, cmd->SCp.this_residual); + } else { + /* push any dirty cache */ + cache_push(addr, cmd->SCp.this_residual); + } + + /* start DMA */ + m147_pcc->dma_bcr = cmd->SCp.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; +} + +int mvme147_detect(struct scsi_host_template *tpnt) +{ + static unsigned char called = 0; + struct Scsi_Host *instance; + wd33c93_regs regs; + struct WD33C93_hostdata *hdata; + + if (!MACH_IS_MVME147 || called) + return 0; + called++; + + tpnt->proc_name = "MVME147"; + tpnt->show_info = wd33c93_show_info, + tpnt->write_info = wd33c93_write_info, + + instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata)); + if (!instance) + goto err_out; + + instance->base = 0xfffe4000; + instance->irq = MVME147_IRQ_SCSI_PORT; + regs.SASR = (volatile unsigned char *)0xfffe4000; + regs.SCMD = (volatile unsigned char *)0xfffe4001; + hdata = shost_priv(instance); + hdata->no_sync = 0xff; + hdata->fast = 0; + hdata->dma_mode = CTRL_DMA; + wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); + + if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, + "MVME147 SCSI PORT", instance)) + goto err_unregister; + if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, + "MVME147 SCSI DMA", instance)) + 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 */ + + return 1; + +err_free_irq: + free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); +err_unregister: + scsi_unregister(instance); +err_out: + return 0; +} + +static int mvme147_bus_reset(struct scsi_cmnd *cmd) +{ + /* FIXME perform bus-specific reset */ + + /* FIXME 2: kill this function, and let midlayer fallback to + the same result, calling wd33c93_host_reset() */ + + spin_lock_irq(cmd->device->host->host_lock); + wd33c93_host_reset(cmd); + spin_unlock_irq(cmd->device->host->host_lock); + + return SUCCESS; +} + + +static struct scsi_host_template driver_template = { + .proc_name = "MVME147", + .name = "MVME147 built-in SCSI", + .detect = mvme147_detect, + .release = mvme147_release, + .queuecommand = wd33c93_queuecommand, + .eh_abort_handler = wd33c93_abort, + .eh_bus_reset_handler = mvme147_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 = ENABLE_CLUSTERING +}; + + +#include "scsi_module.c" + +int mvme147_release(struct Scsi_Host *instance) +{ +#ifdef MODULE + /* XXX Make sure DMA is stopped! */ + free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); + free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr); +#endif + return 1; +} |