diff options
Diffstat (limited to 'drivers/scsi/mvme147.c')
| -rw-r--r-- | drivers/scsi/mvme147.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/scsi/mvme147.c b/drivers/scsi/mvme147.c new file mode 100644 index 000000000000..e73b33f293a0 --- /dev/null +++ b/drivers/scsi/mvme147.c @@ -0,0 +1,155 @@ +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/blkdev.h> +#include <linux/sched.h> +#include <linux/version.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> + +#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) + +static struct Scsi_Host *mvme147_host = NULL; + +static irqreturn_t mvme147_intr (int irq, void *dummy, struct pt_regs *fp) +{ + if (irq == MVME147_IRQ_SCSI_PORT) + wd33c93_intr (mvme147_host); + else + m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ + return IRQ_HANDLED; +} + +static int dma_setup (Scsi_Cmnd *cmd, int dir_in) +{ + unsigned char flags = 0x01; + unsigned long addr = virt_to_bus(cmd->SCp.ptr); + + /* setup dma direction */ + if (!dir_in) + flags |= 0x04; + + /* remember direction */ + HDATA(mvme147_host)->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, Scsi_Cmnd *SCpnt, + int status) +{ + m147_pcc->dma_cntrl = 0; +} + +int mvme147_detect(Scsi_Host_Template *tpnt) +{ + static unsigned char called = 0; + wd33c93_regs regs; + + if (!MACH_IS_MVME147 || called) + return 0; + called++; + + tpnt->proc_name = "MVME147"; + tpnt->proc_info = &wd33c93_proc_info; + + mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); + if (!mvme147_host) + goto err_out; + + mvme147_host->base = 0xfffe4000; + mvme147_host->irq = MVME147_IRQ_SCSI_PORT; + regs.SASR = (volatile unsigned char *)0xfffe4000; + regs.SCMD = (volatile unsigned char *)0xfffe4001; + wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10); + + if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr)) + goto err_unregister; + if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr)) + 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: + wd33c93_release(); + scsi_unregister(mvme147_host); + err_out: + return 0; +} + +static int mvme147_bus_reset(Scsi_Cmnd *cmd) +{ + /* FIXME perform bus-specific reset */ + wd33c93_host_reset(cmd); + return SUCCESS; +} + +#define HOSTS_C + +#include "mvme147.h" + +static 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! */ + wd33c93_release(); + free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); + free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr); +#endif + return 1; +} |