From 9d376402c80cfe2356d84577d366ca790e576bd9 Mon Sep 17 00:00:00 2001 From: Finn Thain Date: Wed, 23 Mar 2016 21:10:10 +1100 Subject: g_ncr5380: Remove CONFIG_SCSI_GENERIC_NCR53C400 This change brings a number of improvements: fewer macros, better test coverage, simpler code and sane Kconfig options. The downside is a small chance of incompatibility (which seems unavoidable). CONFIG_SCSI_GENERIC_NCR53C400 exists to enable or inhibit pseudo DMA transfers when the driver is used with 53C400-compatible cards. Thanks to Ondrej Zary's patches, PDMA now works which means it can be enabled unconditionally. Due to bad design, CONFIG_SCSI_GENERIC_NCR53C400 ties together unrelated functionality as it sets both PSEUDO_DMA and BIOSPARAM macros. This patch effectively enables PSEUDO_DMA and disables BIOSPARAM. The defconfigs and the Kconfig default leave CONFIG_SCSI_GENERIC_NCR53C400 undefined. Red Hat 9 and CentOS 2.1 were the same. This leaves both PSEUDO_DMA and BIOSPARAM disabled. The effect of this patch should be better performance from enabling PSEUDO_DMA. On the other hand, Debian 4 and SLES 10 had CONFIG_SCSI_GENERIC_NCR53C400 enabled, so both PSEUDO_DMA and BIOSPARAM were enabled. This patch might affect configurations like this by disabling BIOSPARAM. My best guess is that this could be a problem only in the vanishingly rare case that 1) the CHS values stored in the boot device partition table are wrong and 2) a 5380 card is in use (because PDMA on 53C400 used to be broken). Signed-off-by: Finn Thain Reviewed-by: Hannes Reinecke Tested-by: Ondrej Zary Signed-off-by: Martin K. Petersen --- drivers/scsi/g_NCR5380.c | 75 +++++++++++++++--------------------------------- 1 file changed, 23 insertions(+), 52 deletions(-) (limited to 'drivers/scsi/g_NCR5380.c') diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index 90091e693020..85ebe109d15d 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -57,10 +57,7 @@ */ #define AUTOPROBE_IRQ - -#ifdef CONFIG_SCSI_GENERIC_NCR53C400 #define PSEUDO_DMA -#endif #include #include @@ -270,7 +267,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) #ifndef SCSI_G_NCR5380_MEM int i; int port_idx = -1; - unsigned long region_size = 16; + unsigned long region_size; #endif static unsigned int __initdata ncr_53c400a_ports[] = { 0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0 @@ -290,6 +287,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) #ifdef SCSI_G_NCR5380_MEM unsigned long base; void __iomem *iomem; + resource_size_t iomem_size; #endif if (ncr_irq) @@ -353,9 +351,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) flags = FLAG_NO_PSEUDO_DMA; break; case BOARD_NCR53C400: -#ifdef PSEUDO_DMA flags = FLAG_NO_DMA_FIXUP; -#endif break; case BOARD_NCR53C400A: flags = FLAG_NO_DMA_FIXUP; @@ -381,20 +377,22 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) /* Disable the adapter and look for a free io port */ magic_configure(-1, 0, magic); + region_size = 16; + if (overrides[current_override].NCR5380_map_name != PORT_AUTO) for (i = 0; ports[i]; i++) { - if (!request_region(ports[i], 16, "ncr53c80")) + if (!request_region(ports[i], region_size, "ncr53c80")) continue; if (overrides[current_override].NCR5380_map_name == ports[i]) break; - release_region(ports[i], 16); + release_region(ports[i], region_size); } else for (i = 0; ports[i]; i++) { - if (!request_region(ports[i], 16, "ncr53c80")) + if (!request_region(ports[i], region_size, "ncr53c80")) continue; if (inb(ports[i]) == 0xff) break; - release_region(ports[i], 16); + release_region(ports[i], region_size); } if (ports[i]) { /* At this point we have our region reserved */ @@ -410,17 +408,19 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) else { /* Not a 53C400A style setup - just grab */ - if(!(request_region(overrides[current_override].NCR5380_map_name, NCR5380_region_size, "ncr5380"))) + region_size = 8; + if (!request_region(overrides[current_override].NCR5380_map_name, + region_size, "ncr5380")) continue; - region_size = NCR5380_region_size; } #else base = overrides[current_override].NCR5380_map_name; - if (!request_mem_region(base, NCR5380_region_size, "ncr5380")) + iomem_size = NCR53C400_region_size; + if (!request_mem_region(base, iomem_size, "ncr5380")) continue; - iomem = ioremap(base, NCR5380_region_size); + iomem = ioremap(base, iomem_size); if (!iomem) { - release_mem_region(base, NCR5380_region_size); + release_mem_region(base, iomem_size); continue; } #endif @@ -458,6 +458,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) #else instance->base = overrides[current_override].NCR5380_map_name; hostdata->iomem = iomem; + hostdata->iomem_size = iomem_size; switch (overrides[current_override].board) { case BOARD_NCR53C400: hostdata->c400_ctl_status = 0x100; @@ -524,7 +525,7 @@ out_release: release_region(overrides[current_override].NCR5380_map_name, region_size); #else iounmap(iomem); - release_mem_region(base, NCR5380_region_size); + release_mem_region(base, iomem_size); #endif return count; } @@ -546,42 +547,15 @@ static int generic_NCR5380_release_resources(struct Scsi_Host *instance) #ifndef SCSI_G_NCR5380_MEM release_region(instance->io_port, instance->n_io_port); #else - iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem); - release_mem_region(instance->base, NCR5380_region_size); -#endif - return 0; -} - -#ifdef BIOSPARAM -/** - * generic_NCR5380_biosparam - * @disk: disk to compute geometry for - * @dev: device identifier for this disk - * @ip: sizes to fill in - * - * Generates a BIOS / DOS compatible H-C-S mapping for the specified - * device / size. - * - * XXX Most SCSI boards use this mapping, I could be incorrect. Someone - * using hard disks on a trantor should verify that this mapping - * corresponds to that used by the BIOS / ASPI driver by running the linux - * fdisk program and matching the H_C_S coordinates to what DOS uses. - * - * Locks: none - */ + { + struct NCR5380_hostdata *hostdata = shost_priv(instance); -static int -generic_NCR5380_biosparam(struct scsi_device *sdev, struct block_device *bdev, - sector_t capacity, int *ip) -{ - ip[0] = 64; - ip[1] = 32; - ip[2] = capacity >> 11; + iounmap(hostdata->iomem); + release_mem_region(instance->base, hostdata->iomem_size); + } +#endif return 0; } -#endif - -#ifdef PSEUDO_DMA /** * NCR5380_pread - pseudo DMA read @@ -756,8 +730,6 @@ static int generic_NCR5380_dma_xfer_len(struct scsi_cmnd *cmd) return transfersize; } -#endif /* PSEUDO_DMA */ - /* * Include the NCR5380 core code that we build our driver around */ @@ -773,7 +745,6 @@ static struct scsi_host_template driver_template = { .queuecommand = generic_NCR5380_queue_command, .eh_abort_handler = generic_NCR5380_abort, .eh_bus_reset_handler = generic_NCR5380_bus_reset, - .bios_param = NCR5380_BIOSPARAM, .can_queue = 16, .this_id = 7, .sg_tablesize = SG_ALL, -- cgit v1.2.1