/* * 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 * @drive: drive * @pio: PIO mode number * * 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_drive_t *drive, const u8 pio) { unsigned long basereg = CS5530_BASEREG(drive->hwif); unsigned int format = (inl(basereg + 4) >> 31) & 1; 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_drive_t *drive, const u8 mode) { unsigned long basereg; unsigned int reg, timings = 0; 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; } basereg = CS5530_BASEREG(drive->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 __devinit 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 __devinitdata = { .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 __devinit 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");