diff options
Diffstat (limited to 'kernel/drivers/scsi/gvp11.c')
| -rw-r--r-- | kernel/drivers/scsi/gvp11.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/gvp11.c b/kernel/drivers/scsi/gvp11.c new file mode 100644 index 000000000..3b6f83ffd --- /dev/null +++ b/kernel/drivers/scsi/gvp11.c @@ -0,0 +1,433 @@ +#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 "gvp11.h" + + +#define CHECK_WD33C93 + +struct gvp11_hostdata { + struct WD33C93_hostdata wh; + struct gvp11_scsiregs *regs; +}; + +static irqreturn_t gvp11_intr(int irq, void *data) +{ + struct Scsi_Host *instance = data; + struct gvp11_hostdata *hdata = shost_priv(instance); + unsigned int status = hdata->regs->CNTR; + unsigned long flags; + + if (!(status & GVP11_DMAC_INT_PENDING)) + 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 gvp11_xfer_mask = 0; + +void gvp11_setup(char *str, int *ints) +{ + gvp11_xfer_mask = ints[1]; +} + +static int dma_setup(struct scsi_cmnd *cmd, int dir_in) +{ + struct Scsi_Host *instance = cmd->device->host; + struct gvp11_hostdata *hdata = shost_priv(instance); + struct WD33C93_hostdata *wh = &hdata->wh; + struct gvp11_scsiregs *regs = hdata->regs; + unsigned short cntr = GVP11_DMAC_INT_ENABLE; + unsigned long addr = virt_to_bus(cmd->SCp.ptr); + int bank_mask; + static int scsi_alloc_out_of_range = 0; + + /* use bounce buffer if the physical address is bad */ + if (addr & wh->dma_xfer_mask) { + wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; + + if (!scsi_alloc_out_of_range) { + wh->dma_bounce_buffer = + kmalloc(wh->dma_bounce_len, GFP_KERNEL); + wh->dma_buffer_pool = BUF_SCSI_ALLOCED; + } + + if (scsi_alloc_out_of_range || + !wh->dma_bounce_buffer) { + wh->dma_bounce_buffer = + amiga_chip_alloc(wh->dma_bounce_len, + "GVP II SCSI Bounce Buffer"); + + if (!wh->dma_bounce_buffer) { + wh->dma_bounce_len = 0; + return 1; + } + + wh->dma_buffer_pool = BUF_CHIP_ALLOCED; + } + + /* check if the address of the bounce buffer is OK */ + addr = virt_to_bus(wh->dma_bounce_buffer); + + if (addr & wh->dma_xfer_mask) { + /* fall back to Chip RAM if address out of range */ + if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) { + kfree(wh->dma_bounce_buffer); + scsi_alloc_out_of_range = 1; + } else { + amiga_chip_free(wh->dma_bounce_buffer); + } + + wh->dma_bounce_buffer = + amiga_chip_alloc(wh->dma_bounce_len, + "GVP II SCSI Bounce Buffer"); + + if (!wh->dma_bounce_buffer) { + wh->dma_bounce_len = 0; + return 1; + } + + addr = virt_to_bus(wh->dma_bounce_buffer); + wh->dma_buffer_pool = BUF_CHIP_ALLOCED; + } + + 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 |= GVP11_DMAC_DIR_WRITE; + + 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); + } + + bank_mask = (~wh->dma_xfer_mask >> 18) & 0x01c0; + if (bank_mask) + regs->BANK = bank_mask & (addr >> 18); + + /* 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 gvp11_hostdata *hdata = shost_priv(instance); + struct WD33C93_hostdata *wh = &hdata->wh; + struct gvp11_scsiregs *regs = hdata->regs; + + /* stop DMA */ + regs->SP_DMA = 1; + /* remove write bit from CONTROL bits */ + regs->CNTR = GVP11_DMAC_INT_ENABLE; + + /* copy from a bounce buffer, if necessary */ + if (status && wh->dma_bounce_buffer) { + if (wh->dma_dir && SCpnt) + memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, + SCpnt->SCp.this_residual); + + if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) + kfree(wh->dma_bounce_buffer); + else + amiga_chip_free(wh->dma_bounce_buffer); + + wh->dma_bounce_buffer = NULL; + wh->dma_bounce_len = 0; + } +} + +static int gvp11_bus_reset(struct scsi_cmnd *cmd) +{ + struct Scsi_Host *instance = cmd->device->host; + + /* FIXME perform bus-specific reset */ + + /* FIXME 2: shouldn't we no-op this function (return + FAILED), and fall back to host reset function, + 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 gvp11_scsi_template = { + .module = THIS_MODULE, + .name = "GVP Series II SCSI", + .show_info = wd33c93_show_info, + .write_info = wd33c93_write_info, + .proc_name = "GVP11", + .queuecommand = wd33c93_queuecommand, + .eh_abort_handler = wd33c93_abort, + .eh_bus_reset_handler = gvp11_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 check_wd33c93(struct gvp11_scsiregs *regs) +{ +#ifdef CHECK_WD33C93 + volatile unsigned char *sasr_3393, *scmd_3393; + unsigned char save_sasr; + unsigned char q, qq; + + /* + * These darn GVP boards are a problem - it can be tough to tell + * whether or not they include a SCSI controller. This is the + * ultimate Yet-Another-GVP-Detection-Hack in that it actually + * probes for a WD33c93 chip: If we find one, it's extremely + * likely that this card supports SCSI, regardless of Product_ + * Code, Board_Size, etc. + */ + + /* Get pointers to the presumed register locations and save contents */ + + sasr_3393 = ®s->SASR; + scmd_3393 = ®s->SCMD; + save_sasr = *sasr_3393; + + /* First test the AuxStatus Reg */ + + q = *sasr_3393; /* read it */ + if (q & 0x08) /* bit 3 should always be clear */ + return -ENODEV; + *sasr_3393 = WD_AUXILIARY_STATUS; /* setup indirect address */ + if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */ + *sasr_3393 = save_sasr; /* Oops - restore this byte */ + return -ENODEV; + } + if (*sasr_3393 != q) { /* should still read the same */ + *sasr_3393 = save_sasr; /* Oops - restore this byte */ + return -ENODEV; + } + if (*scmd_3393 != q) /* and so should the image at 0x1f */ + return -ENODEV; + + /* + * Ok, we probably have a wd33c93, but let's check a few other places + * for good measure. Make sure that this works for both 'A and 'B + * chip versions. + */ + + *sasr_3393 = WD_SCSI_STATUS; + q = *scmd_3393; + *sasr_3393 = WD_SCSI_STATUS; + *scmd_3393 = ~q; + *sasr_3393 = WD_SCSI_STATUS; + qq = *scmd_3393; + *sasr_3393 = WD_SCSI_STATUS; + *scmd_3393 = q; + if (qq != q) /* should be read only */ + return -ENODEV; + *sasr_3393 = 0x1e; /* this register is unimplemented */ + q = *scmd_3393; + *sasr_3393 = 0x1e; + *scmd_3393 = ~q; + *sasr_3393 = 0x1e; + qq = *scmd_3393; + *sasr_3393 = 0x1e; + *scmd_3393 = q; + if (qq != q || qq != 0xff) /* should be read only, all 1's */ + return -ENODEV; + *sasr_3393 = WD_TIMEOUT_PERIOD; + q = *scmd_3393; + *sasr_3393 = WD_TIMEOUT_PERIOD; + *scmd_3393 = ~q; + *sasr_3393 = WD_TIMEOUT_PERIOD; + qq = *scmd_3393; + *sasr_3393 = WD_TIMEOUT_PERIOD; + *scmd_3393 = q; + if (qq != (~q & 0xff)) /* should be read/write */ + return -ENODEV; +#endif /* CHECK_WD33C93 */ + + return 0; +} + +static int gvp11_probe(struct zorro_dev *z, const struct zorro_device_id *ent) +{ + struct Scsi_Host *instance; + unsigned long address; + int error; + unsigned int epc; + unsigned int default_dma_xfer_mask; + struct gvp11_hostdata *hdata; + struct gvp11_scsiregs *regs; + wd33c93_regs wdregs; + + default_dma_xfer_mask = ent->driver_data; + + /* + * Rumors state that some GVP ram boards use the same product + * code as the SCSI controllers. Therefore if the board-size + * is not 64KB we assume it is a ram board and bail out. + */ + if (zorro_resource_len(z) != 0x10000) + return -ENODEV; + + address = z->resource.start; + if (!request_mem_region(address, 256, "wd33c93")) + return -EBUSY; + + regs = ZTWO_VADDR(address); + + error = check_wd33c93(regs); + if (error) + goto fail_check_or_alloc; + + instance = scsi_host_alloc(&gvp11_scsi_template, + sizeof(struct gvp11_hostdata)); + if (!instance) { + error = -ENOMEM; + goto fail_check_or_alloc; + } + + instance->irq = IRQ_AMIGA_PORTS; + instance->unique_id = z->slotaddr; + + regs->secret2 = 1; + regs->secret1 = 0; + regs->secret3 = 15; + while (regs->CNTR & GVP11_DMAC_BUSY) + ; + regs->CNTR = 0; + regs->BANK = 0; + + wdregs.SASR = ®s->SASR; + wdregs.SCMD = ®s->SCMD; + + hdata = shost_priv(instance); + if (gvp11_xfer_mask) + hdata->wh.dma_xfer_mask = gvp11_xfer_mask; + else + hdata->wh.dma_xfer_mask = default_dma_xfer_mask; + + hdata->wh.no_sync = 0xff; + hdata->wh.fast = 0; + hdata->wh.dma_mode = CTRL_DMA; + hdata->regs = regs; + + /* + * Check for 14MHz SCSI clock + */ + epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000); + wd33c93_init(instance, wdregs, dma_setup, dma_stop, + (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10 + : WD33C93_FS_12_15); + + error = request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED, + "GVP11 SCSI", instance); + if (error) + goto fail_irq; + + regs->CNTR = GVP11_DMAC_INT_ENABLE; + + 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_check_or_alloc: + release_mem_region(address, 256); + return error; +} + +static void gvp11_remove(struct zorro_dev *z) +{ + struct Scsi_Host *instance = zorro_get_drvdata(z); + struct gvp11_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); +} + + /* + * This should (hopefully) be the correct way to identify + * all the different GVP SCSI controllers (except for the + * SERIES I though). + */ + +static struct zorro_device_id gvp11_zorro_tbl[] = { + { ZORRO_PROD_GVP_COMBO_030_R3_SCSI, ~0x00ffffff }, + { ZORRO_PROD_GVP_SERIES_II, ~0x00ffffff }, + { ZORRO_PROD_GVP_GFORCE_030_SCSI, ~0x01ffffff }, + { ZORRO_PROD_GVP_A530_SCSI, ~0x01ffffff }, + { ZORRO_PROD_GVP_COMBO_030_R4_SCSI, ~0x01ffffff }, + { ZORRO_PROD_GVP_A1291, ~0x07ffffff }, + { ZORRO_PROD_GVP_GFORCE_040_SCSI_1, ~0x07ffffff }, + { 0 } +}; +MODULE_DEVICE_TABLE(zorro, gvp11_zorro_tbl); + +static struct zorro_driver gvp11_driver = { + .name = "gvp11", + .id_table = gvp11_zorro_tbl, + .probe = gvp11_probe, + .remove = gvp11_remove, +}; + +static int __init gvp11_init(void) +{ + return zorro_register_driver(&gvp11_driver); +} +module_init(gvp11_init); + +static void __exit gvp11_exit(void) +{ + zorro_unregister_driver(&gvp11_driver); +} +module_exit(gvp11_exit); + +MODULE_DESCRIPTION("GVP Series II SCSI"); +MODULE_LICENSE("GPL"); |