diff options
Diffstat (limited to 'drivers/ide/cs5530.c')
| -rw-r--r-- | drivers/ide/cs5530.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/ide/cs5530.c b/drivers/ide/cs5530.c new file mode 100644 index 000000000..65371599b --- /dev/null +++ b/drivers/ide/cs5530.c @@ -0,0 +1,295 @@ +/* + * Copyright (C) 2000 Andre Hedrick <andre@linux-ide.org> + * Copyright (C) 2000 Mark Lord <mlord@pobox.com> + * Copyright (C) 2007 Bartlomiej Zolnierkiewicz + * + * 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/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/ide.h> + +#include <asm/io.h> + +#define DRV_NAME "cs5530" + +/* + * 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_set_pio_mode - set host controller for PIO mode + * @hwif: port + * @drive: drive + * + * Handles setting of PIO mode for the chipset. + * + * The init_hwif_cs5530() routine guarantees that all drives + * will have valid default PIO timings set up before we get here. + */ + +static void cs5530_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) +{ + unsigned long basereg = CS5530_BASEREG(hwif); + unsigned int format = (inl(basereg + 4) >> 31) & 1; + const u8 pio = drive->pio_mode - XFER_PIO_0; + + outl(cs5530_pio_timings[format][pio], basereg + ((drive->dn & 1)<<3)); +} + +/** + * cs5530_udma_filter - UDMA filter + * @drive: drive + * + * cs5530_udma_filter() does UDMA mask filtering for the given drive + * taking into the consideration capabilities of the mate device. + * + * 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 MWDMA2 + * but instead drop to PIO. + */ + +static u8 cs5530_udma_filter(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + ide_drive_t *mate = ide_get_pair_dev(drive); + u16 *mateid; + u8 mask = hwif->ultra_mask; + + if (mate == NULL) + goto out; + mateid = mate->id; + + if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) { + if ((mateid[ATA_ID_FIELD_VALID] & 4) && + (mateid[ATA_ID_UDMA_MODES] & 7)) + goto out; + if (mateid[ATA_ID_MWDMA_MODES] & 7) + mask = 0; + } +out: + return mask; +} + +static void cs5530_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive) +{ + unsigned long basereg; + unsigned int reg, timings = 0; + + switch (drive->dma_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; + } + basereg = CS5530_BASEREG(hwif); + reg = inl(basereg + 4); /* get drive0 config register */ + timings |= reg & 0x80000000; /* preserve PIO format bit */ + if ((drive-> dn & 1) == 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 */ + } +} + +/** + * init_chipset_5530 - set up 5530 bridge + * @dev: PCI device + * + * Initialize the cs5530 bridge for reliable IDE DMA operation. + */ + +static int init_chipset_cs5530(struct pci_dev *dev) +{ + struct pci_dev *master_0 = NULL, *cs5530_0 = NULL; + + if (pci_resource_start(dev, 4) == 0) + return -EFAULT; + + dev = NULL; + while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) { + switch (dev->device) { + case PCI_DEVICE_ID_CYRIX_PCI_MASTER: + master_0 = pci_dev_get(dev); + break; + case PCI_DEVICE_ID_CYRIX_5530_LEGACY: + cs5530_0 = pci_dev_get(dev); + break; + } + } + if (!master_0) { + printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n"); + goto out; + } + if (!cs5530_0) { + printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n"); + goto out; + } + + /* + * 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_try_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); + +out: + pci_dev_put(master_0); + pci_dev_put(cs5530_0); + 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_hwif_cs5530 (ide_hwif_t *hwif) +{ + unsigned long basereg; + u32 d0_timings; + + basereg = CS5530_BASEREG(hwif); + d0_timings = inl(basereg + 0); + if (CS5530_BAD_PIO(d0_timings)) + outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 0); + if (CS5530_BAD_PIO(inl(basereg + 8))) + outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 8); +} + +static const struct ide_port_ops cs5530_port_ops = { + .set_pio_mode = cs5530_set_pio_mode, + .set_dma_mode = cs5530_set_dma_mode, + .udma_filter = cs5530_udma_filter, +}; + +static const struct ide_port_info cs5530_chipset = { + .name = DRV_NAME, + .init_chipset = init_chipset_cs5530, + .init_hwif = init_hwif_cs5530, + .port_ops = &cs5530_port_ops, + .host_flags = IDE_HFLAG_SERIALIZE | + IDE_HFLAG_POST_SET_MODE, + .pio_mask = ATA_PIO4, + .mwdma_mask = ATA_MWDMA2, + .udma_mask = ATA_UDMA2, +}; + +static int cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + return ide_pci_init_one(dev, &cs5530_chipset, NULL); +} + +static const struct pci_device_id cs5530_pci_tbl[] = { + { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), 0 }, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl); + +static struct pci_driver cs5530_pci_driver = { + .name = "CS5530 IDE", + .id_table = cs5530_pci_tbl, + .probe = cs5530_init_one, + .remove = ide_pci_remove, + .suspend = ide_pci_suspend, + .resume = ide_pci_resume, +}; + +static int __init cs5530_ide_init(void) +{ + return ide_pci_register_driver(&cs5530_pci_driver); +} + +static void __exit cs5530_ide_exit(void) +{ + pci_unregister_driver(&cs5530_pci_driver); +} + +module_init(cs5530_ide_init); +module_exit(cs5530_ide_exit); + +MODULE_AUTHOR("Mark Lord"); +MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE"); +MODULE_LICENSE("GPL"); |