diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2000-03-19 01:28:40 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2000-03-19 01:28:40 +0000 |
commit | 8abb719409c9060a7c0676f76e9182c1e0b8ca46 (patch) | |
tree | b88cc5a6cd513a04a512b7e6215c873c90a1c5dd /drivers/block/ide-dma.c | |
parent | f01bd7aeafd95a08aafc9e3636bb26974df69d82 (diff) |
Merge with 2.3.99-pre1.
Diffstat (limited to 'drivers/block/ide-dma.c')
-rw-r--r-- | drivers/block/ide-dma.c | 580 |
1 files changed, 0 insertions, 580 deletions
diff --git a/drivers/block/ide-dma.c b/drivers/block/ide-dma.c deleted file mode 100644 index 751424831..000000000 --- a/drivers/block/ide-dma.c +++ /dev/null @@ -1,580 +0,0 @@ -/* - * linux/drivers/block/ide-dma.c Version 4.09 April 23, 1999 - * - * Copyright (c) 1999 Andre Hedrick - * May be copied or modified under the terms of the GNU General Public License - */ - -/* - * Special Thanks to Mark for his Six years of work. - * - * Copyright (c) 1995-1998 Mark Lord - * May be copied or modified under the terms of the GNU General Public License - */ - -/* - * This module provides support for the bus-master IDE DMA functions - * of various PCI chipsets, including the Intel PIIX (i82371FB for - * the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and - * 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset) - * ("PIIX" stands for "PCI ISA IDE Xcellerator"). - * - * Pretty much the same code works for other IDE PCI bus-mastering chipsets. - * - * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies). - * - * By default, DMA support is prepared for use, but is currently enabled only - * for drives which already have DMA enabled (UltraDMA or mode 2 multi/single), - * or which are recognized as "good" (see table below). Drives with only mode0 - * or mode1 (multi/single) DMA should also work with this chipset/driver - * (eg. MC2112A) but are not enabled by default. - * - * Use "hdparm -i" to view modes supported by a given drive. - * - * The hdparm-3.5 (or later) utility can be used for manually enabling/disabling - * DMA support, but must be (re-)compiled against this kernel version or later. - * - * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting. - * If problems arise, ide.c will disable DMA operation after a few retries. - * This error recovery mechanism works and has been extremely well exercised. - * - * IDE drives, depending on their vintage, may support several different modes - * of DMA operation. The boot-time modes are indicated with a "*" in - * the "hdparm -i" listing, and can be changed with *knowledgeable* use of - * the "hdparm -X" feature. There is seldom a need to do this, as drives - * normally power-up with their "best" PIO/DMA modes enabled. - * - * Testing has been done with a rather extensive number of drives, - * with Quantum & Western Digital models generally outperforming the pack, - * and Fujitsu & Conner (and some Seagate which are really Conner) drives - * showing more lackluster throughput. - * - * Keep an eye on /var/adm/messages for "DMA disabled" messages. - * - * Some people have reported trouble with Intel Zappa motherboards. - * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0, - * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe - * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this). - * - * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for - * fixing the problem with the BIOS on some Acer motherboards. - * - * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing - * "TX" chipset compatibility and for providing patches for the "TX" chipset. - * - * Thanks to Christian Brunner <chb@muc.de> for taking a good first crack - * at generic DMA -- his patches were referred to when preparing this code. - * - * Most importantly, thanks to Robert Bringman <rob@mars.trion.com> - * for supplying a Promise UDMA board & WD UDMA drive for this work! - * - * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports. - * - * ACARD ATP850UF Chipset "Modified SCSI Class" with other names - * AEC6210 U/UF - * SIIG's UltraIDE Pro CN-2449 - * TTI HPT343 Chipset "Modified SCSI Class" but reports as an - * unknown storage device. - * NEW check_drive_lists(ide_drive_t *drive, int good_bad) - */ - -#include <linux/config.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/pci.h> -#include <linux/init.h> -#include <linux/ide.h> - -#include <asm/io.h> -#include <asm/irq.h> - -extern char *ide_dmafunc_verbose(ide_dma_action_t dmafunc); - -#ifdef CONFIG_IDEDMA_NEW_DRIVE_LISTINGS - -struct drive_list_entry { - char * id_model; - char * id_firmware; -}; - -struct drive_list_entry drive_whitelist [] = { - - { "Micropolis 2112A" , "ALL" }, - { "CONNER CTMA 4000" , "ALL" }, - { "CONNER CTT8000-A" , "ALL" }, - { "ST34342A" , "ALL" }, - { 0 , 0 } -}; - -struct drive_list_entry drive_blacklist [] = { - - { "WDC AC11000H" , "ALL" }, - { "WDC AC22100H" , "ALL" }, - { "WDC AC32500H" , "ALL" }, - { "WDC AC33100H" , "ALL" }, - { "WDC AC31600H" , "ALL" }, - { "WDC AC32100H" , "24.09P07" }, - { "WDC AC23200L" , "21.10N21" }, - { 0 , 0 } - -}; - -int in_drive_list(struct hd_driveid *id, struct drive_list_entry * drive_table) -{ - for ( ; drive_table->id_model ; drive_table++) - if ((!strcmp(drive_table->id_model, id->model)) && - ((!strstr(drive_table->id_firmware, id->fw_rev)) || - (!strcmp(drive_table->id_firmware, "ALL")))) - return 1; - return 0; -} - -#else /* !CONFIG_IDEDMA_NEW_DRIVE_LISTINGS */ - -/* - * good_dma_drives() lists the model names (from "hdparm -i") - * of drives which do not support mode2 DMA but which are - * known to work fine with this interface under Linux. - */ -const char *good_dma_drives[] = {"Micropolis 2112A", - "CONNER CTMA 4000", - "CONNER CTT8000-A", - "ST34342A", /* for Sun Ultra */ - NULL}; - -/* - * bad_dma_drives() lists the model names (from "hdparm -i") - * of drives which supposedly support (U)DMA but which are - * known to corrupt data with this interface under Linux. - * - * This is an empirical list. Its generated from bug reports. That means - * while it reflects actual problem distributions it doesn't answer whether - * the drive or the controller, or cabling, or software, or some combination - * thereof is the fault. If you don't happen to agree with the kernel's - * opinion of your drive - use hdparm to turn DMA on. - */ -const char *bad_dma_drives[] = {"WDC AC11000H", - "WDC AC22100H", - "WDC AC32100H", - "WDC AC32500H", - "WDC AC33100H", - "WDC AC31600H", - NULL}; - -#endif /* CONFIG_IDEDMA_NEW_DRIVE_LISTINGS */ - -/* - * Our Physical Region Descriptor (PRD) table should be large enough - * to handle the biggest I/O request we are likely to see. Since requests - * can have no more than 256 sectors, and since the typical blocksize is - * two or more sectors, we could get by with a limit of 128 entries here for - * the usual worst case. Most requests seem to include some contiguous blocks, - * further reducing the number of table entries required. - * - * The driver reverts to PIO mode for individual requests that exceed - * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling - * 100% of all crazy scenarios here is not necessary. - * - * As it turns out though, we must allocate a full 4KB page for this, - * so the two PRD tables (ide0 & ide1) will each get half of that, - * allowing each to have about 256 entries (8 bytes each) from this. - */ -#define PRD_BYTES 8 -#define PRD_ENTRIES (PAGE_SIZE / (2 * PRD_BYTES)) - -/* - * dma_intr() is the handler for disk read/write DMA interrupts - */ -ide_startstop_t ide_dma_intr (ide_drive_t *drive) -{ - int i; - byte stat, dma_stat; - - dma_stat = HWIF(drive)->dmaproc(ide_dma_end, drive); - stat = GET_STAT(); /* get drive status */ - if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) { - if (!dma_stat) { - struct request *rq = HWGROUP(drive)->rq; - rq = HWGROUP(drive)->rq; - for (i = rq->nr_sectors; i > 0;) { - i -= rq->current_nr_sectors; - ide_end_request(1, HWGROUP(drive)); - } - return ide_stopped; - } - printk("%s: dma_intr: bad DMA status\n", drive->name); - } - return ide_error(drive, "dma_intr", stat); -} - -static int ide_build_sglist (ide_hwif_t *hwif, struct request *rq) -{ - struct buffer_head *bh; - struct scatterlist *sg = hwif->sg_table; - int nents = 0; - - if (rq->cmd == READ) - hwif->sg_dma_direction = PCI_DMA_FROMDEVICE; - else - hwif->sg_dma_direction = PCI_DMA_TODEVICE; - bh = rq->bh; - do { - unsigned char *virt_addr = bh->b_data; - unsigned int size = bh->b_size; - - while ((bh = bh->b_reqnext) != NULL) { - if ((virt_addr + size) != (unsigned char *) bh->b_data) - break; - size += bh->b_size; - } - memset(&sg[nents], 0, sizeof(*sg)); - sg[nents].address = virt_addr; - sg[nents].length = size; - nents++; - } while (bh != NULL); - - return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction); -} - -/* - * ide_build_dmatable() prepares a dma request. - * Returns 0 if all went okay, returns 1 otherwise. - * May also be invoked from trm290.c - */ -int ide_build_dmatable (ide_drive_t *drive, ide_dma_action_t func) -{ - unsigned int *table = HWIF(drive)->dmatable_cpu; -#ifdef CONFIG_BLK_DEV_TRM290 - unsigned int is_trm290_chipset = (HWIF(drive)->chipset == ide_trm290); -#else - const int is_trm290_chipset = 0; -#endif - unsigned int count = 0; - int i; - struct scatterlist *sg; - - HWIF(drive)->sg_nents = i = ide_build_sglist(HWIF(drive), HWGROUP(drive)->rq); - - sg = HWIF(drive)->sg_table; - while (i && sg_dma_len(sg)) { - u32 cur_addr; - u32 cur_len; - - cur_addr = sg_dma_address(sg); - cur_len = sg_dma_len(sg); - - while (cur_len) { - if (++count >= PRD_ENTRIES) { - printk("%s: DMA table too small\n", drive->name); - pci_unmap_sg(HWIF(drive)->pci_dev, - HWIF(drive)->sg_table, - HWIF(drive)->sg_nents, - HWIF(drive)->sg_dma_direction); - return 0; /* revert to PIO for this request */ - } else { - u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff); - - if (bcount > cur_len) - bcount = cur_len; - *table++ = cpu_to_le32(cur_addr); - xcount = bcount & 0xffff; - if (is_trm290_chipset) - xcount = ((xcount >> 2) - 1) << 16; - *table++ = cpu_to_le32(xcount); - cur_addr += bcount; - cur_len -= bcount; - } - } - - sg++; - i--; - } - - if (!count) - printk("%s: empty DMA table?\n", drive->name); - else if (!is_trm290_chipset) - *--table |= cpu_to_le32(0x80000000); - - return count; -} - -/* Teardown mappings after DMA has completed. */ -void ide_destroy_dmatable (ide_drive_t *drive) -{ - struct pci_dev *dev = HWIF(drive)->pci_dev; - struct scatterlist *sg = HWIF(drive)->sg_table; - int nents = HWIF(drive)->sg_nents; - - pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction); -} - -/* - * For both Blacklisted and Whitelisted drives. - * This is setup to be called as an extern for future support - * to other special driver code. - */ -int check_drive_lists (ide_drive_t *drive, int good_bad) -{ - struct hd_driveid *id = drive->id; - -#ifdef CONFIG_IDEDMA_NEW_DRIVE_LISTINGS - if (good_bad) { - return in_drive_list(id, drive_whitelist); - } else { - int blacklist = in_drive_list(id, drive_blacklist); - if (blacklist) - printk("%s: Disabling (U)DMA for %s\n", drive->name, id->model); - return(blacklist); - } -#else /* !CONFIG_IDEDMA_NEW_DRIVE_LISTINGS */ - const char **list; - - if (good_bad) { - /* Consult the list of known "good" drives */ - list = good_dma_drives; - while (*list) { - if (!strcmp(*list++,id->model)) - return 1; - } - } else { - /* Consult the list of known "bad" drives */ - list = bad_dma_drives; - while (*list) { - if (!strcmp(*list++,id->model)) { - printk("%s: Disabling (U)DMA for %s\n", - drive->name, id->model); - return 1; - } - } - } -#endif /* CONFIG_IDEDMA_NEW_DRIVE_LISTINGS */ - return 0; -} - -static int config_drive_for_dma (ide_drive_t *drive) -{ - struct hd_driveid *id = drive->id; - ide_hwif_t *hwif = HWIF(drive); - - if (id && (id->capability & 1) && hwif->autodma) { - /* Consult the list of known "bad" drives */ - if (ide_dmaproc(ide_dma_bad_drive, drive)) - return hwif->dmaproc(ide_dma_off, drive); - - /* Enable DMA on any drive that has UltraDMA (mode 3/4) enabled */ - if ((id->field_valid & 4) && (hwif->udma_four) && (id->hw_config & 0x2000)) - if ((id->dma_ultra & (id->dma_ultra >> 11) & 3)) - return hwif->dmaproc(ide_dma_on, drive); - /* Enable DMA on any drive that has UltraDMA (mode 0/1/2) enabled */ - if (id->field_valid & 4) /* UltraDMA */ - if ((id->dma_ultra & (id->dma_ultra >> 8) & 7)) - return hwif->dmaproc(ide_dma_on, drive); - /* Enable DMA on any drive that has mode2 DMA (multi or single) enabled */ - if (id->field_valid & 2) /* regular DMA */ - if ((id->dma_mword & 0x404) == 0x404 || (id->dma_1word & 0x404) == 0x404) - return hwif->dmaproc(ide_dma_on, drive); - /* Consult the list of known "good" drives */ - if (ide_dmaproc(ide_dma_good_drive, drive)) - return hwif->dmaproc(ide_dma_on, drive); - } - return hwif->dmaproc(ide_dma_off_quietly, drive); -} - -/* - * ide_dmaproc() initiates/aborts DMA read/write operations on a drive. - * - * The caller is assumed to have selected the drive and programmed the drive's - * sector address using CHS or LBA. All that remains is to prepare for DMA - * and then issue the actual read/write DMA/PIO command to the drive. - * - * For ATAPI devices, we just prepare for DMA and return. The caller should - * then issue the packet command to the drive and call us again with - * ide_dma_begin afterwards. - * - * Returns 0 if all went well. - * Returns 1 if DMA read/write could not be started, in which case - * the caller should revert to PIO for the current request. - * May also be invoked from trm290.c - */ -int ide_dmaproc (ide_dma_action_t func, ide_drive_t *drive) -{ - ide_hwif_t *hwif = HWIF(drive); - unsigned long dma_base = hwif->dma_base; - byte unit = (drive->select.b.unit & 0x01); - unsigned int count, reading = 0; - byte dma_stat; - - switch (func) { - case ide_dma_off: - printk("%s: DMA disabled\n", drive->name); - case ide_dma_off_quietly: - outb(inb(dma_base+2) & ~(1<<(5+unit)), dma_base+2); - case ide_dma_on: - drive->using_dma = (func == ide_dma_on); - if (drive->using_dma) - outb(inb(dma_base+2)|(1<<(5+unit)), dma_base+2); - return 0; - case ide_dma_check: - return config_drive_for_dma (drive); - case ide_dma_read: - reading = 1 << 3; - case ide_dma_write: - if (!(count = ide_build_dmatable(drive, func))) - return 1; /* try PIO instead of DMA */ - outl(hwif->dmatable_dma, dma_base + 4); /* PRD table */ - outb(reading, dma_base); /* specify r/w */ - outb(inb(dma_base+2)|6, dma_base+2); /* clear INTR & ERROR flags */ - drive->waiting_for_dma = 1; - if (drive->media != ide_disk) - return 0; - ide_set_handler(drive, &ide_dma_intr, WAIT_CMD, NULL); /* issue cmd to drive */ - OUT_BYTE(reading ? WIN_READDMA : WIN_WRITEDMA, IDE_COMMAND_REG); - case ide_dma_begin: - /* Note that this is done *after* the cmd has - * been issued to the drive, as per the BM-IDE spec. - * The Promise Ultra33 doesn't work correctly when - * we do this part before issuing the drive cmd. - */ - outb(inb(dma_base)|1, dma_base); /* start DMA */ - return 0; - case ide_dma_end: /* returns 1 on error, 0 otherwise */ - drive->waiting_for_dma = 0; - outb(inb(dma_base)&~1, dma_base); /* stop DMA */ - dma_stat = inb(dma_base+2); /* get DMA status */ - outb(dma_stat|6, dma_base+2); /* clear the INTR & ERROR bits */ - ide_destroy_dmatable(drive); /* purge DMA mappings */ - return (dma_stat & 7) != 4; /* verify good DMA status */ - case ide_dma_test_irq: /* returns 1 if dma irq issued, 0 otherwise */ - dma_stat = inb(dma_base+2); - return (dma_stat & 4) == 4; /* return 1 if INTR asserted */ - case ide_dma_bad_drive: - case ide_dma_good_drive: - return check_drive_lists(drive, (func == ide_dma_good_drive)); - case ide_dma_lostirq: - case ide_dma_timeout: - printk("ide_dmaproc: chipset supported %s func only: %d\n", ide_dmafunc_verbose(func), func); - return 1; - default: - printk("ide_dmaproc: unsupported %s func: %d\n", ide_dmafunc_verbose(func), func); - return 1; - } -} - -/* - * Needed for allowing full modular support of ide-driver - */ -int ide_release_dma (ide_hwif_t *hwif) -{ - if (hwif->dmatable_cpu) { - pci_free_consistent(hwif->pci_dev, - PRD_ENTRIES * PRD_BYTES, - hwif->dmatable_cpu, - hwif->dmatable_dma); - hwif->dmatable_cpu = NULL; - } - if (hwif->sg_table) { - kfree(hwif->sg_table); - hwif->sg_table = NULL; - } - if ((hwif->dma_extra) && (hwif->channel == 0)) - release_region((hwif->dma_base + 16), hwif->dma_extra); - release_region(hwif->dma_base, 8); - return 1; -} - -/* - * This can be called for a dynamically installed interface. Don't __init it - */ - -void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports) -{ - printk(" %s: BM-DMA at 0x%04lx-0x%04lx", hwif->name, dma_base, dma_base + num_ports - 1); - if (check_region(dma_base, num_ports)) { - printk(" -- ERROR, PORT ADDRESSES ALREADY IN USE\n"); - return; - } - request_region(dma_base, num_ports, hwif->name); - hwif->dma_base = dma_base; - hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev, - PRD_ENTRIES * PRD_BYTES, - &hwif->dmatable_dma); - if (hwif->dmatable_cpu == NULL) - goto dma_alloc_failure; - - hwif->sg_table = kmalloc(sizeof(struct scatterlist) * PRD_ENTRIES, - GFP_KERNEL); - if (hwif->sg_table == NULL) { - pci_free_consistent(hwif->pci_dev, PRD_ENTRIES * PRD_BYTES, - hwif->dmatable_cpu, hwif->dmatable_dma); - goto dma_alloc_failure; - } - - hwif->dmaproc = &ide_dmaproc; - - if (hwif->chipset != ide_trm290) { - byte dma_stat = inb(dma_base+2); - printk(", BIOS settings: %s:%s, %s:%s", - hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio", - hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio"); - } - printk("\n"); - return; - -dma_alloc_failure: - printk(" -- ERROR, UNABLE TO ALLOCATE DMA TABLES\n"); -} - -/* - * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space: - */ -unsigned long __init ide_get_or_set_dma_base (ide_hwif_t *hwif, int extra, const char *name) -{ - unsigned long dma_base = 0; - struct pci_dev *dev = hwif->pci_dev; - - if (hwif->mate && hwif->mate->dma_base) { - dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8); - } else { - dma_base = dev->resource[4].start; - if (!dma_base || dma_base == PCI_BASE_ADDRESS_IO_MASK) { - printk("%s: dma_base is invalid (0x%04lx)\n", name, dma_base); - dma_base = 0; - } - } - if (dma_base) { - if (extra) /* PDC20246, PDC20262, HPT343, & HPT366 */ - request_region(dma_base+16, extra, name); - dma_base += hwif->channel ? 8 : 0; - hwif->dma_extra = extra; - - switch(dev->device) { - case PCI_DEVICE_ID_AL_M5219: - case PCI_DEVICE_ID_AMD_VIPER_7409: - case PCI_DEVICE_ID_CMD_643: - outb(inb(dma_base+2) & 0x60, dma_base+2); - if (inb(dma_base+2) & 0x80) { - printk("%s: simplex device: DMA forced\n", name); - } - break; - default: - /* - * If the device claims "simplex" DMA, - * this means only one of the two interfaces - * can be trusted with DMA at any point in time. - * So we should enable DMA only on one of the - * two interfaces. - */ - if ((inb(dma_base+2) & 0x80)) { /* simplex device? */ - if ((!hwif->drives[0].present && !hwif->drives[1].present) || - (hwif->mate && hwif->mate->dma_base)) { - printk("%s: simplex device: DMA disabled\n", name); - dma_base = 0; - } - } - } - } - return dma_base; -} |