cs5530.c
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上传日期:2013-04-10
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- /*
- * linux/drivers/ide/cs5530.c Version 0.6 Mar. 18, 2000
- *
- * Copyright (C) 2000 Andre Hedrick <andre@linux-ide.org>
- * Ditto of GNU General Public License.
- *
- * Copyright (C) 2000 Mark Lord <mlord@pobox.com>
- * May be copied or modified under the terms of the GNU General Public License
- *
- * Development of this chipset driver was funded
- * by the nice folks at National Semiconductor.
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/timer.h>
- #include <linux/mm.h>
- #include <linux/ioport.h>
- #include <linux/blkdev.h>
- #include <linux/hdreg.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>
- #include "ide_modes.h"
- #define DISPLAY_CS5530_TIMINGS
- #if defined(DISPLAY_CS5530_TIMINGS) && defined(CONFIG_PROC_FS)
- #include <linux/stat.h>
- #include <linux/proc_fs.h>
- static int cs5530_get_info(char *, char **, off_t, int);
- extern int (*cs5530_display_info)(char *, char **, off_t, int); /* ide-proc.c */
- extern char *ide_media_verbose(ide_drive_t *);
- static struct pci_dev *bmide_dev;
- static int cs5530_get_info (char *buffer, char **addr, off_t offset, int count)
- {
- char *p = buffer;
- u32 bibma = pci_resource_start(bmide_dev, 4);
- u8 c0 = 0, c1 = 0;
- /*
- * at that point bibma+0x2 et bibma+0xa are byte registers
- * to investigate:
- */
- c0 = inb_p((unsigned short)bibma + 0x02);
- c1 = inb_p((unsigned short)bibma + 0x0a);
- p += sprintf(p, "n Cyrix 5530 Chipset.n");
- p += sprintf(p, "--------------- Primary Channel ---------------- Secondary Channel -------------n");
- p += sprintf(p, " %sabled %sabledn",
- (c0&0x80) ? "dis" : " en",
- (c1&0x80) ? "dis" : " en");
- p += sprintf(p, "--------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------n");
- p += sprintf(p, "DMA enabled: %s %s %s %sn",
- (c0&0x20) ? "yes" : "no ", (c0&0x40) ? "yes" : "no ",
- (c1&0x20) ? "yes" : "no ", (c1&0x40) ? "yes" : "no " );
- p += sprintf(p, "UDMAn");
- p += sprintf(p, "DMAn");
- p += sprintf(p, "PIOn");
- return p-buffer;
- }
- #endif /* DISPLAY_CS5530_TIMINGS && CONFIG_PROC_FS */
- byte cs5530_proc = 0;
- extern char *ide_xfer_verbose (byte xfer_rate);
- /*
- * Set a new transfer mode at the drive
- */
- int cs5530_set_xfer_mode (ide_drive_t *drive, byte mode)
- {
- int error = 0;
- printk("%s: cs5530_set_xfer_mode(%s)n", drive->name, ide_xfer_verbose(mode));
- error = ide_config_drive_speed(drive, mode);
- return error;
- }
- /*
- * Here are the standard PIO mode 0-4 timings for each "format".
- * Format-0 uses fast data reg timings, with slower command reg timings.
- * Format-1 uses fast timings for all registers, but won't work with all drives.
- */
- static unsigned int cs5530_pio_timings[2][5] =
- {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
- {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}};
- /*
- * After chip reset, the PIO timings are set to 0x0000e132, which is not valid.
- */
- #define CS5530_BAD_PIO(timings) (((timings)&~0x80000000)==0x0000e132)
- #define CS5530_BASEREG(hwif) (((hwif)->dma_base & ~0xf) + ((hwif)->channel ? 0x30 : 0x20))
- /*
- * cs5530_tuneproc() handles selection/setting of PIO modes
- * for both the chipset and drive.
- *
- * The ide_init_cs5530() routine guarantees that all drives
- * will have valid default PIO timings set up before we get here.
- */
- static void cs5530_tuneproc (ide_drive_t *drive, byte pio) /* pio=255 means "autotune" */
- {
- ide_hwif_t *hwif = HWIF(drive);
- unsigned int format, basereg = CS5530_BASEREG(hwif);
- static byte modes[5] = {XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};
- pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
- if (!cs5530_set_xfer_mode(drive, modes[pio])) {
- format = (inl(basereg+4) >> 31) & 1;
- outl(cs5530_pio_timings[format][pio], basereg+(drive->select.b.unit<<3));
- }
- }
- #ifdef CONFIG_BLK_DEV_IDEDMA
- /*
- * cs5530_config_dma() handles selection/setting of DMA/UDMA modes
- * for both the chipset and drive.
- */
- static int cs5530_config_dma (ide_drive_t *drive)
- {
- int udma_ok = 1, mode = 0;
- ide_hwif_t *hwif = HWIF(drive);
- int unit = drive->select.b.unit;
- ide_drive_t *mate = &hwif->drives[unit^1];
- struct hd_driveid *id = drive->id;
- unsigned int basereg, reg, timings;
- /*
- * Default to DMA-off in case we run into trouble here.
- */
- (void)hwif->dmaproc(ide_dma_off_quietly, drive); /* turn off DMA while we fiddle */
- outb(inb(hwif->dma_base+2)&~(unit?0x40:0x20), hwif->dma_base+2); /* clear DMA_capable bit */
- /*
- * The CS5530 specifies that two drives sharing a cable cannot
- * mix UDMA/MDMA. It has to be one or the other, for the pair,
- * though different timings can still be chosen for each drive.
- * We could set the appropriate timing bits on the fly,
- * but that might be a bit confusing. So, for now we statically
- * handle this requirement by looking at our mate drive to see
- * what it is capable of, before choosing a mode for our own drive.
- */
- if (mate->present) {
- struct hd_driveid *mateid = mate->id;
- if (mateid && (mateid->capability & 1) && !hwif->dmaproc(ide_dma_bad_drive, mate)) {
- if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
- udma_ok = 1;
- else if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
- udma_ok = 0;
- else
- udma_ok = 1;
- }
- }
- /*
- * Now see what the current drive is capable of,
- * selecting UDMA only if the mate said it was ok.
- */
- if (id && (id->capability & 1) && hwif->autodma && !hwif->dmaproc(ide_dma_bad_drive, drive)) {
- if (udma_ok && (id->field_valid & 4) && (id->dma_ultra & 7)) {
- if (id->dma_ultra & 4)
- mode = XFER_UDMA_2;
- else if (id->dma_ultra & 2)
- mode = XFER_UDMA_1;
- else if (id->dma_ultra & 1)
- mode = XFER_UDMA_0;
- }
- if (!mode && (id->field_valid & 2) && (id->dma_mword & 7)) {
- if (id->dma_mword & 4)
- mode = XFER_MW_DMA_2;
- else if (id->dma_mword & 2)
- mode = XFER_MW_DMA_1;
- else if (id->dma_mword & 1)
- mode = XFER_MW_DMA_0;
- }
- }
- /*
- * Tell the drive to switch to the new mode; abort on failure.
- */
- if (!mode || cs5530_set_xfer_mode(drive, mode))
- return 1; /* failure */
- /*
- * Now tune the chipset to match the drive:
- */
- switch (mode) {
- case XFER_UDMA_0: timings = 0x00921250; break;
- case XFER_UDMA_1: timings = 0x00911140; break;
- case XFER_UDMA_2: timings = 0x00911030; break;
- case XFER_MW_DMA_0: timings = 0x00077771; break;
- case XFER_MW_DMA_1: timings = 0x00012121; break;
- case XFER_MW_DMA_2: timings = 0x00002020; break;
- default:
- printk("%s: cs5530_config_dma: huh? mode=%02xn", drive->name, mode);
- return 1; /* failure */
- }
- basereg = CS5530_BASEREG(hwif);
- reg = inl(basereg+4); /* get drive0 config register */
- timings |= reg & 0x80000000; /* preserve PIO format bit */
- if (unit == 0) { /* are we configuring drive0? */
- outl(timings, basereg+4); /* write drive0 config register */
- } else {
- if (timings & 0x00100000)
- reg |= 0x00100000; /* enable UDMA timings for both drives */
- else
- reg &= ~0x00100000; /* disable UDMA timings for both drives */
- outl(reg, basereg+4); /* write drive0 config register */
- outl(timings, basereg+12); /* write drive1 config register */
- }
- outb(inb(hwif->dma_base+2)|(unit?0x40:0x20), hwif->dma_base+2); /* set DMA_capable bit */
- /*
- * Finally, turn DMA on in software, and exit.
- */
- return hwif->dmaproc(ide_dma_on, drive); /* success */
- }
- /*
- * This is a CS5530-specific wrapper for the standard ide_dmaproc().
- * We need it for our custom "ide_dma_check" function.
- * All other requests are forwarded to the standard ide_dmaproc().
- */
- int cs5530_dmaproc (ide_dma_action_t func, ide_drive_t *drive)
- {
- switch (func) {
- case ide_dma_check:
- return cs5530_config_dma(drive);
- default:
- break;
- }
- /* Other cases are done by generic IDE-DMA code. */
- return ide_dmaproc(func, drive);
- }
- #endif /* CONFIG_BLK_DEV_IDEDMA */
- /*
- * Initialize the cs5530 bridge for reliable IDE DMA operation.
- */
- unsigned int __init pci_init_cs5530 (struct pci_dev *dev, const char *name)
- {
- struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
- unsigned short pcicmd = 0;
- unsigned long flags;
- #if defined(DISPLAY_CS5530_TIMINGS) && defined(CONFIG_PROC_FS)
- if (!cs5530_proc) {
- cs5530_proc = 1;
- bmide_dev = dev;
- cs5530_display_info = &cs5530_get_info;
- }
- #endif /* DISPLAY_CS5530_TIMINGS && CONFIG_PROC_FS */
- pci_for_each_dev (dev) {
- if (dev->vendor == PCI_VENDOR_ID_CYRIX) {
- switch (dev->device) {
- case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
- master_0 = dev;
- break;
- case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
- cs5530_0 = dev;
- break;
- }
- }
- }
- if (!master_0) {
- printk("%s: unable to locate PCI MASTER functionn", name);
- return 0;
- }
- if (!cs5530_0) {
- printk("%s: unable to locate CS5530 LEGACY functionn", name);
- return 0;
- }
- save_flags(flags);
- cli(); /* all CPUs (there should only be one CPU with this chipset) */
- /*
- * Enable BusMaster and MemoryWriteAndInvalidate for the cs5530:
- * --> OR 0x14 into 16-bit PCI COMMAND reg of function 0 of the cs5530
- */
- pci_read_config_word (cs5530_0, PCI_COMMAND, &pcicmd);
- pci_write_config_word(cs5530_0, PCI_COMMAND, pcicmd | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE);
- /*
- * Set PCI CacheLineSize to 16-bytes:
- * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
- */
- pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
- /*
- * Disable trapping of UDMA register accesses (Win98 hack):
- * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
- */
- pci_write_config_word(cs5530_0, 0xd0, 0x5006);
- /*
- * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
- * The other settings are what is necessary to get the register
- * into a sane state for IDE DMA operation.
- */
- pci_write_config_byte(master_0, 0x40, 0x1e);
- /*
- * Set max PCI burst size (16-bytes seems to work best):
- * 16bytes: set bit-1 at 0x41 (reg value of 0x16)
- * all others: clear bit-1 at 0x41, and do:
- * 128bytes: OR 0x00 at 0x41
- * 256bytes: OR 0x04 at 0x41
- * 512bytes: OR 0x08 at 0x41
- * 1024bytes: OR 0x0c at 0x41
- */
- pci_write_config_byte(master_0, 0x41, 0x14);
- /*
- * These settings are necessary to get the chip
- * into a sane state for IDE DMA operation.
- */
- pci_write_config_byte(master_0, 0x42, 0x00);
- pci_write_config_byte(master_0, 0x43, 0xc1);
- restore_flags(flags);
- return 0;
- }
- /*
- * This gets invoked by the IDE driver once for each channel,
- * and performs channel-specific pre-initialization before drive probing.
- */
- void __init ide_init_cs5530 (ide_hwif_t *hwif)
- {
- if (hwif->mate)
- hwif->serialized = hwif->mate->serialized = 1;
- if (!hwif->dma_base) {
- hwif->autodma = 0;
- } else {
- unsigned int basereg, d0_timings;
- #ifdef CONFIG_BLK_DEV_IDEDMA
- hwif->dmaproc = &cs5530_dmaproc;
- #else
- hwif->autodma = 0;
- #endif /* CONFIG_BLK_DEV_IDEDMA */
- hwif->tuneproc = &cs5530_tuneproc;
- basereg = CS5530_BASEREG(hwif);
- d0_timings = inl(basereg+0);
- if (CS5530_BAD_PIO(d0_timings)) { /* PIO timings not initialized? */
- outl(cs5530_pio_timings[(d0_timings>>31)&1][0], basereg+0);
- if (!hwif->drives[0].autotune)
- hwif->drives[0].autotune = 1; /* needs autotuning later */
- }
- if (CS5530_BAD_PIO(inl(basereg+8))) { /* PIO timings not initialized? */
- outl(cs5530_pio_timings[(d0_timings>>31)&1][0], basereg+8);
- if (!hwif->drives[1].autotune)
- hwif->drives[1].autotune = 1; /* needs autotuning later */
- }
- }
- }