diff options
Diffstat (limited to 'drivers/ide/ide-dma.c')
| -rw-r--r-- | drivers/ide/ide-dma.c | 580 |
1 files changed, 580 insertions, 0 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c new file mode 100644 index 000000000..751424831 --- /dev/null +++ b/drivers/ide/ide-dma.c @@ -0,0 +1,580 @@ +/* + * 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; +} |