i2c-acorn.rar_acorn

#include <linux/types.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/zorro.h> #include <linux/module.h> #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" struct a2091_hostdata { struct WD33C93_hostdata wh; struct a2091_scsiregs *regs; }; static irqreturn_t a2091_intr(int irq, void *data) { struct Scsi_Host *instance = data; struct a2091_hostdata *hdata = shost_priv(instance); unsigned int status = hdata->regs->ISTR; 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; } static int dma_setup(struct scsi_cmnd *cmd, int dir_in) { struct Scsi_Host *instance = cmd->device->host; struct a2091_hostdata *hdata = shost_priv(instance); struct WD33C93_hostdata *wh = &hdata->wh; struct a2091_scsiregs *regs = hdata->regs; unsigned short cntr = CNTR_PDMD | CNTR_INTEN; unsigned long addr = virt_to_bus(cmd->SCp.ptr); /* don't allow DMA if the physical address is bad */ if (addr & A2091_XFER_MASK) { wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len, GFP_KERNEL); /* can't allocate memory; use PIO */ if (!wh->dma_bounce_buffer) { wh->dma_bounce_len = 0; return 1; } /* get the physical address of the bounce buffer */ addr = virt_to_bus(wh->dma_bounce_buffer); /* the bounce buffer may not be in the first 16M of physmem */ if (addr & A2091_XFER_MASK) { /* we could use chipmem... maybe later */ kfree(wh->dma_bounce_buffer); wh->dma_bounce_buffer = NULL; wh->dma_bounce_len = 0; return 1; } if (!dir_in) { /* copy to bounce buffer for a write */ memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr, cmd->SCp.this_residual); } } /* setup dma direction */ if (!dir_in) cntr |= CNTR_DDIR; /* remember direction */ wh->dma_dir = dir_in; regs->CNTR = cntr; /* setup DMA *physical* address */ regs->ACR = addr; 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 */ regs->ST_DMA = 1; /* return success */ return 0; } static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, int status) { struct a2091_hostdata *hdata = shost_priv(instance); struct WD33C93_hostdata *wh = &hdata->wh; struct a2091_scsiregs *regs = hdata->regs; /* disable SCSI interrupts */ unsigned short cntr = CNTR_PDMD; if (!wh->dma_dir) cntr |= CNTR_DDIR; /* disable SCSI interrupts */ regs->CNTR = cntr; /* flush if we were reading */ if (wh->dma_dir) { regs->FLUSH = 1; while (!(regs->ISTR & ISTR_FE_FLG)) ; } /* clear a possible interrupt */ regs->CINT = 1; /* stop DMA */ regs->SP_DMA = 1; /* restore the CONTROL bits (minus the direction flag) */ regs->CNTR = CNTR_PDMD | CNTR_INTEN; /* copy from a bounce buffer, if necessary */ if (status && wh->dma_bounce_buffer) { if (wh->dma_dir) memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, SCpnt->SCp.this_residual); kfree(wh->dma_bounce_buffer); wh->dma_bounce_buffer = NULL; wh->dma_bounce_len = 0; } } static int a2091_bus_reset(struct scsi_cmnd *cmd) { struct Scsi_Host *instance = cmd->device->host; /* FIXME perform bus-specific reset */ /* FIXME 2: kill this function, and let midlayer fall back to the same action, calling wd33c93_host_reset() */ spin_lock_irq(instance->host_lock); wd33c93_host_reset(cmd); spin_unlock_irq(instance->host_lock); return SUCCESS; } static struct scsi_host_template a2091_scsi_template = { .module = THIS_MODULE, .name = "Commodore A2091/A590 SCSI", .show_info = wd33c93_show_info, .write_info = wd33c93_write_info, .proc_name = "A2901", .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 }; static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent) { struct Scsi_Host *instance; int error; struct a2091_scsiregs *regs; wd33c93_regs wdregs; struct a2091_hostdata *hdata; if (!request_mem_region(z->resource.start, 256, "wd33c93")) return -EBUSY; instance = scsi_host_alloc(&a2091_scsi_template, sizeof(struct a2091_hostdata)); if (!instance) { error = -ENOMEM; goto fail_alloc; } instance->irq = IRQ_AMIGA_PORTS; instance->unique_id = z->slotaddr; regs = ZTWO_VADDR(z->resource.start); regs->DAWR = DAWR_A2091; wdregs.SASR = &regs->SASR; wdregs.SCMD = &regs->SCMD; hdata = shost_priv(instance); hdata->wh.no_sync = 0xff; hdata->wh.fast = 0; hdata->wh.dma_mode = CTRL_DMA; hdata->regs = regs; 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; 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; } static void a2091_remove(struct zorro_dev *z) { struct Scsi_Host *instance = zorro_get_drvdata(z); struct a2091_hostdata *hdata = shost_priv(instance); hdata->regs->CNTR = 0; scsi_remove_host(instance); free_irq(IRQ_AMIGA_PORTS, instance); scsi_host_put(instance); release_mem_region(z->resource.start, 256); } static struct zorro_device_id a2091_zorro_tbl[] = { { 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, .remove = a2091_remove, }; 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); } module_exit(a2091_exit); MODULE_DESCRIPTION("Commodore A2091/A590 SCSI"); MODULE_LICENSE("GPL");