diff options
Diffstat (limited to 'drivers/ide/pci/cs5530.c')
| -rw-r--r-- | drivers/ide/pci/cs5530.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c new file mode 100644 index 000000000000..0381961db263 --- /dev/null +++ b/drivers/ide/pci/cs5530.c @@ -0,0 +1,384 @@ +/* + * linux/drivers/ide/pci/cs5530.c Version 0.7 Sept 10, 2002 + * + * 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. + * + * Documentation: + * CS5530 documentation available from National Semiconductor. + */ + +#include <linux/config.h> +#include <linux/module.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> + +/** + * cs5530_xfer_set_mode - set a new transfer mode at the drive + * @drive: drive to tune + * @mode: new mode + * + * Logging wrapper to the IDE driver speed configuration. This can + * probably go away now. + */ + +static int cs5530_set_xfer_mode (ide_drive_t *drive, u8 mode) +{ + printk(KERN_DEBUG "%s: cs5530_set_xfer_mode(%s)\n", + drive->name, ide_xfer_verbose(mode)); + return (ide_config_drive_speed(drive, mode)); +} + +/* + * 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 - select/set PIO modes + * + * 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, u8 pio) /* pio=255 means "autotune" */ +{ + ide_hwif_t *hwif = HWIF(drive); + unsigned int format; + unsigned long basereg = CS5530_BASEREG(hwif); + static u8 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 = (hwif->INL(basereg+4) >> 31) & 1; + hwif->OUTL(cs5530_pio_timings[format][pio], + basereg+(drive->select.b.unit<<3)); + } +} + +/** + * cs5530_config_dma - select/set DMA and UDMA modes + * @drive: drive to tune + * + * cs5530_config_dma() handles selection/setting of DMA/UDMA modes + * for both the chipset and drive. The CS5530 has limitations about + * mixing DMA/UDMA on the same cable. + */ + +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 reg, timings; + unsigned long basereg; + + /* + * Default to DMA-off in case we run into trouble here. + */ + hwif->ide_dma_off_quietly(drive); + /* turn off DMA while we fiddle */ + hwif->ide_dma_host_off(drive); + /* 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. + * + * Note: This relies on the fact we never fail from UDMA to MWDMA_2 + * but instead drop to PIO + */ + if (mate->present) { + struct hd_driveid *mateid = mate->id; + if (mateid && (mateid->capability & 1) && + !__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) && drive->autodma && + !__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(KERN_ERR "%s: cs5530_config_dma: huh? mode=%02x\n", + drive->name, mode); + return 1; /* failure */ + } + basereg = CS5530_BASEREG(hwif); + reg = hwif->INL(basereg+4); /* get drive0 config register */ + timings |= reg & 0x80000000; /* preserve PIO format bit */ + if (unit == 0) { /* are we configuring drive0? */ + hwif->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 */ + hwif->OUTL(reg, basereg+4); /* write drive0 config register */ + hwif->OUTL(timings, basereg+12); /* write drive1 config register */ + } + (void) hwif->ide_dma_host_on(drive); + /* set DMA_capable bit */ + + /* + * Finally, turn DMA on in software, and exit. + */ + return hwif->ide_dma_on(drive); /* success */ +} + +/** + * init_chipset_5530 - set up 5530 bridge + * @dev: PCI device + * @name: device name + * + * Initialize the cs5530 bridge for reliable IDE DMA operation. + */ + +static unsigned int __init init_chipset_cs5530 (struct pci_dev *dev, const char *name) +{ + struct pci_dev *master_0 = NULL, *cs5530_0 = NULL; + unsigned long flags; + + dev = NULL; + while ((dev = pci_find_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) { + 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(KERN_ERR "%s: unable to locate PCI MASTER function\n", name); + return 0; + } + if (!cs5530_0) { + printk(KERN_ERR "%s: unable to locate CS5530 LEGACY function\n", name); + return 0; + } + + spin_lock_irqsave(&ide_lock, flags); + /* 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_set_master(cs5530_0); + pci_set_mwi(cs5530_0); + + /* + * 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); + + spin_unlock_irqrestore(&ide_lock, flags); + + return 0; +} + +/** + * init_hwif_cs5530 - initialise an IDE channel + * @hwif: IDE to initialize + * + * This gets invoked by the IDE driver once for each channel. It + * performs channel-specific pre-initialization before drive probing. + */ + +static void __init init_hwif_cs5530 (ide_hwif_t *hwif) +{ + unsigned long basereg; + u32 d0_timings; + hwif->autodma = 0; + + if (hwif->mate) + hwif->serialized = hwif->mate->serialized = 1; + + hwif->tuneproc = &cs5530_tuneproc; + basereg = CS5530_BASEREG(hwif); + d0_timings = hwif->INL(basereg+0); + if (CS5530_BAD_PIO(d0_timings)) { + /* PIO timings not initialized? */ + hwif->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(hwif->INL(basereg+8))) { + /* PIO timings not initialized? */ + hwif->OUTL(cs5530_pio_timings[(d0_timings>>31)&1][0], basereg+8); + if (!hwif->drives[1].autotune) + hwif->drives[1].autotune = 1; + /* needs autotuning later */ + } + + hwif->atapi_dma = 1; + hwif->ultra_mask = 0x07; + hwif->mwdma_mask = 0x07; + + hwif->ide_dma_check = &cs5530_config_dma; + if (!noautodma) + hwif->autodma = 1; + hwif->drives[0].autodma = hwif->autodma; + hwif->drives[1].autodma = hwif->autodma; +} + +static ide_pci_device_t cs5530_chipset __devinitdata = { + .name = "CS5530", + .init_chipset = init_chipset_cs5530, + .init_hwif = init_hwif_cs5530, + .channels = 2, + .autodma = AUTODMA, + .bootable = ON_BOARD, +}; + +static int __devinit cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + return ide_setup_pci_device(dev, &cs5530_chipset); +} + +static struct pci_device_id cs5530_pci_tbl[] = { + { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl); + +static struct pci_driver driver = { + .name = "CS5530 IDE", + .id_table = cs5530_pci_tbl, + .probe = cs5530_init_one, +}; + +static int cs5530_ide_init(void) +{ + return ide_pci_register_driver(&driver); +} + +module_init(cs5530_ide_init); + +MODULE_AUTHOR("Mark Lord"); +MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE"); +MODULE_LICENSE("GPL"); |