The flags DMA_WORKS_RIGHT, FLAG_NCR53C400 and FLAG_HAS_LAST_BYTE_SENT all mean the same thing, i.e. the chip is not a 538[01]. (More recent devices such as the 53C80 have a 'Last Byte Sent' bit in the Target Command Register as well as other fixes for End-of-DMA errata.) These flags have no additional meanings since previous cleanup patches eliminated the NCR53C400 macro, moved g_NCR5380-specific code out of the core driver and standardized interrupt handling. Use the FLAG_NO_DMA_FIXUP flag to suppress End-of-DMA errata workarounds, for those cards and drivers that make use of the TCR_LAST_BYTE_SENT bit. Remove the old flags. Signed-off-by: Finn Thain --- drivers/scsi/NCR5380.c | 68 +++++++++++++++-------------------------------- drivers/scsi/NCR5380.h | 4 -- drivers/scsi/dtc.c | 4 -- drivers/scsi/g_NCR5380.c | 5 +-- 4 files changed, 26 insertions(+), 55 deletions(-) Index: linux/drivers/scsi/NCR5380.c =================================================================== --- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:33:55.000000000 +1100 +++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:33:56.000000000 +1100 @@ -552,7 +552,7 @@ static void prepare_info(struct Scsi_Hos instance->base, instance->irq, instance->can_queue, instance->cmd_per_lun, instance->sg_tablesize, instance->this_id, - hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "", + hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "", hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "", hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", @@ -712,6 +712,7 @@ static int NCR5380_init(struct Scsi_Host hostdata->connected = NULL; hostdata->issue_queue = NULL; hostdata->disconnected_queue = NULL; + hostdata->flags = flags; INIT_WORK(&hostdata->main_task, NCR5380_main); hostdata->work_q = alloc_workqueue("ncr5380_%d", @@ -720,12 +721,6 @@ static int NCR5380_init(struct Scsi_Host if (!hostdata->work_q) return -ENOMEM; - /* The CHECK code seems to break the 53C400. Will check it later maybe */ - if (flags & FLAG_NCR53C400) - hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; - else - hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; - hostdata->host = instance; prepare_info(instance); @@ -1609,7 +1604,7 @@ static int NCR5380_transfer_dma(struct S * before the setting of DMA mode to after transfer of the last byte. */ - if (hostdata->flags & FLAG_NCR53C400) + if (hostdata->flags & FLAG_NO_DMA_FIXUP) NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | MR_ENABLE_EOP_INTR); else @@ -1729,14 +1724,9 @@ static int NCR5380_transfer_dma(struct S return 0; #else /* defined(REAL_DMA_POLL) */ if (p & SR_IO) { -#ifdef DMA_WORKS_RIGHT - foo = NCR5380_pread(instance, d, c); -#else - int diff = 1; - if (hostdata->flags & FLAG_NCR53C400) { - diff = 0; - } - if (!(foo = NCR5380_pread(instance, d, c - diff))) { + foo = NCR5380_pread(instance, d, + hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1); + if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { /* * We can't disable DMA mode after successfully transferring * what we plan to be the last byte, since that would open up @@ -1759,46 +1749,32 @@ static int NCR5380_transfer_dma(struct S * byte. */ - if (!(hostdata->flags & FLAG_NCR53C400)) { - while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); - /* Wait for clean handshake */ - while (NCR5380_read(STATUS_REG) & SR_REQ); - d[c - 1] = NCR5380_read(INPUT_DATA_REG); + if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, + BASR_DRQ, BASR_DRQ, HZ) < 0) { + foo = -1; + shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); + } + if (NCR5380_poll_politely(instance, STATUS_REG, + SR_REQ, 0, HZ) < 0) { + foo = -1; + shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); } + d[c - 1] = NCR5380_read(INPUT_DATA_REG); } -#endif } else { -#ifdef DMA_WORKS_RIGHT foo = NCR5380_pwrite(instance, d, c); -#else - int timeout; - dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c); - if (!(foo = NCR5380_pwrite(instance, d, c))) { + if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { /* * Wait for the last byte to be sent. If REQ is being asserted for * the byte we're interested, we'll ACK it and it will go false. */ - if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { - timeout = 20000; - while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); - - if (!timeout) - dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no); - - if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { - hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; - if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { - hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; - dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no); - } - } - } else { - dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n"); - while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); - dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n"); + if (NCR5380_poll_politely2(instance, + BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, + BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) { + foo = -1; + shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n"); } } -#endif } NCR5380_write(MODE_REG, MR_BASE); NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); Index: linux/drivers/scsi/NCR5380.h =================================================================== --- linux.orig/drivers/scsi/NCR5380.h 2015-11-18 19:33:51.000000000 +1100 +++ linux/drivers/scsi/NCR5380.h 2015-11-18 19:33:56.000000000 +1100 @@ -226,9 +226,7 @@ #define NO_IRQ 0 #endif -#define FLAG_HAS_LAST_BYTE_SENT 1 /* NCR53c81 or better */ -#define FLAG_CHECK_LAST_BYTE_SENT 2 /* Only test once */ -#define FLAG_NCR53C400 4 /* NCR53c400 */ +#define FLAG_NO_DMA_FIXUP 1 /* No DMA errata workarounds */ #define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */ #define FLAG_DTC3181E 16 /* DTC3181E */ #define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */ Index: linux/drivers/scsi/dtc.c =================================================================== --- linux.orig/drivers/scsi/dtc.c 2015-11-18 19:33:53.000000000 +1100 +++ linux/drivers/scsi/dtc.c 2015-11-18 19:33:56.000000000 +1100 @@ -1,7 +1,5 @@ #define PSEUDO_DMA #define DONT_USE_INTR -#define DMA_WORKS_RIGHT - /* * DTC 3180/3280 driver, by @@ -233,7 +231,7 @@ found: instance->base = addr; ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base; - if (NCR5380_init(instance, 0)) + if (NCR5380_init(instance, FLAG_NO_DMA_FIXUP)) goto out_unregister; NCR5380_maybe_reset_bus(instance); Index: linux/drivers/scsi/g_NCR5380.c =================================================================== --- linux.orig/drivers/scsi/g_NCR5380.c 2015-11-18 19:33:53.000000000 +1100 +++ linux/drivers/scsi/g_NCR5380.c 2015-11-18 19:33:56.000000000 +1100 @@ -320,9 +320,8 @@ static int __init generic_NCR5380_detect flags = FLAG_NO_PSEUDO_DMA; break; case BOARD_NCR53C400: -#ifdef PSEUDO_DMA - flags = FLAG_NCR53C400; -#else + flags = FLAG_NO_DMA_FIXUP; +#ifndef PSEUDO_DMA flags = FLAG_NO_PSEUDO_DMA; #endif break; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/