/* * 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 __devinit 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 __devinit 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");