/* * CS5536 PATA support * (C) 2007 Martin K. Petersen <mkp@mkp.net> * (C) 2009 Bartlomiej Zolnierkiewicz * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Documentation: * Available from AMD web site. * * The IDE timing registers for the CS5536 live in the Geode Machine * Specific Register file and not PCI config space. Most BIOSes * virtualize the PCI registers so the chip looks like a standard IDE * controller. Unfortunately not all implementations get this right. * In particular some have problems with unaligned accesses to the * virtualized PCI registers. This driver always does full dword * writes to work around the issue. Also, in case of a bad BIOS this * driver can be loaded with the "msr=1" parameter which forces using * the Machine Specific Registers to configure the device. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/ide.h> #include <asm/msr.h> #define DRV_NAME "cs5536" enum { MSR_IDE_CFG = 0x51300010, PCI_IDE_CFG = 0x40, CFG = 0, DTC = 2, CAST = 3, ETC = 4, IDE_CFG_CHANEN = (1 << 1), IDE_CFG_CABLE = (1 << 17) | (1 << 16), IDE_D0_SHIFT = 24, IDE_D1_SHIFT = 16, IDE_DRV_MASK = 0xff, IDE_CAST_D0_SHIFT = 6, IDE_CAST_D1_SHIFT = 4, IDE_CAST_DRV_MASK = 0x3, IDE_CAST_CMD_SHIFT = 24, IDE_CAST_CMD_MASK = 0xff, IDE_ETC_UDMA_MASK = 0xc0, }; static int use_msr; static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val) { if (unlikely(use_msr)) { u32 dummy; rdmsr(MSR_IDE_CFG + reg, *val, dummy); return 0; } return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val); } static int cs5536_write(struct pci_dev *pdev, int reg, int val) { if (unlikely(use_msr)) { wrmsr(MSR_IDE_CFG + reg, val, 0); return 0; } return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val); } static void cs5536_program_dtc(ide_drive_t *drive, u8 tim) { struct pci_dev *pdev = to_pci_dev(drive->hwif->dev); int dshift = (drive->dn & 1) ? IDE_D1_SHIFT : IDE_D0_SHIFT; u32 dtc; cs5536_read(pdev, DTC, &dtc); dtc &= ~(IDE_DRV_MASK << dshift); dtc |= tim << dshift; cs5536_write(pdev, DTC, dtc); } /** * cs5536_cable_detect - detect cable type * @hwif: Port to detect on * * Perform cable detection for ATA66 capable cable. * * Returns a cable type. */ static u8 cs5536_cable_detect(ide_hwif_t *hwif) { struct pci_dev *pdev = to_pci_dev(hwif->dev); u32 cfg; cs5536_read(pdev, CFG, &cfg); if (cfg & IDE_CFG_CABLE) return ATA_CBL_PATA80; else return ATA_CBL_PATA40; } /** * cs5536_set_pio_mode - PIO timing setup * @drive: ATA device * @pio: PIO mode number */ static void cs5536_set_pio_mode(ide_drive_t *drive, const u8 pio) { static const u8 drv_timings[5] = { 0x98, 0x55, 0x32, 0x21, 0x20, }; static const u8 addr_timings[5] = { 0x2, 0x1, 0x0, 0x0, 0x0, }; static const u8 cmd_timings[5] = { 0x99, 0x92, 0x90, 0x22, 0x20, }; struct pci_dev *pdev = to_pci_dev(drive->hwif->dev); ide_drive_t *pair = ide_get_pair_dev(drive); int cshift = (drive->dn & 1) ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT; unsigned long timings = (unsigned long)ide_get_drivedata(drive); u32 cast; u8 cmd_pio = pio; if (pair) cmd_pio = min(pio, ide_get_best_pio_mode(pair, 255, 4)); timings &= (IDE_DRV_MASK << 8); timings |= drv_timings[pio]; ide_set_drivedata(drive, (void *)timings); cs5536_program_dtc(drive, drv_timings[pio]); cs5536_read(pdev, CAST, &cast); cast &= ~(IDE_CAST_DRV_MASK << cshift); cast |= addr_timings[pio] << cshift; cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT); cast |= cmd_timings[cmd_pio] << IDE_CAST_CMD_SHIFT; cs5536_write(pdev, CAST, cast); } /** * cs5536_set_dma_mode - DMA timing setup * @drive: ATA device * @mode: DMA mode */ static void cs5536_set_dma_mode(ide_drive_t *drive, const u8 mode) { static const u8 udma_timings[6] = { 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6, }; static const u8 mwdma_timings[3] = { 0x67, 0x21, 0x20, }; struct pci_dev *pdev = to_pci_dev(drive->hwif->dev); int dshift = (drive->dn & 1) ? IDE_D1_SHIFT : IDE_D0_SHIFT; unsigned long timings = (unsigned long)ide_get_drivedata(drive); u32 etc; cs5536_read(pdev, ETC, &etc); if (mode >= XFER_UDMA_0) { etc &= ~(IDE_DRV_MASK << dshift); etc |= udma_timings[mode - XFER_UDMA_0] << dshift; } else { /* MWDMA */ etc &= ~(IDE_ETC_UDMA_MASK << dshift); timings &= IDE_DRV_MASK; timings |= mwdma_timings[mode - XFER_MW_DMA_0] << 8; ide_set_drivedata(drive, (void *)timings); } cs5536_write(pdev, ETC, etc); } static void cs5536_dma_start(ide_drive_t *drive) { unsigned long timings = (unsigned long)ide_get_drivedata(drive); if (drive->current_speed < XFER_UDMA_0 && (timings >> 8) != (timings & IDE_DRV_MASK)) cs5536_program_dtc(drive, timings >> 8); ide_dma_start(drive); } static int cs5536_dma_end(ide_drive_t *drive) { int ret = ide_dma_end(drive); unsigned long timings = (unsigned long)ide_get_drivedata(drive); if (drive->current_speed < XFER_UDMA_0 && (timings >> 8) != (timings & IDE_DRV_MASK)) cs5536_program_dtc(drive, timings & IDE_DRV_MASK); return ret; } static const struct ide_port_ops cs5536_port_ops = { .set_pio_mode = cs5536_set_pio_mode, .set_dma_mode = cs5536_set_dma_mode, .cable_detect = cs5536_cable_detect, }; static const struct ide_dma_ops cs5536_dma_ops = { .dma_host_set = ide_dma_host_set, .dma_setup = ide_dma_setup, .dma_start = cs5536_dma_start, .dma_end = cs5536_dma_end, .dma_test_irq = ide_dma_test_irq, .dma_lost_irq = ide_dma_lost_irq, .dma_timer_expiry = ide_dma_sff_timer_expiry, .dma_sff_read_status = ide_dma_sff_read_status, }; static const struct ide_port_info cs5536_info = { .name = DRV_NAME, .port_ops = &cs5536_port_ops, .dma_ops = &cs5536_dma_ops, .host_flags = IDE_HFLAG_SINGLE, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .udma_mask = ATA_UDMA5, }; /** * cs5536_init_one * @dev: PCI device * @id: Entry in match table */ static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id) { u32 cfg; if (use_msr) printk(KERN_INFO DRV_NAME ": Using MSR regs instead of PCI\n"); cs5536_read(dev, CFG, &cfg); if ((cfg & IDE_CFG_CHANEN) == 0) { printk(KERN_ERR DRV_NAME ": disabled by BIOS\n"); return -ENODEV; } return ide_pci_init_one(dev, &cs5536_info, NULL); } static const struct pci_device_id cs5536_pci_tbl[] = { { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), }, { }, }; static struct pci_driver cs5536_pci_driver = { .name = DRV_NAME, .id_table = cs5536_pci_tbl, .probe = cs5536_init_one, .remove = ide_pci_remove, .suspend = ide_pci_suspend, .resume = ide_pci_resume, }; static int __init cs5536_init(void) { return pci_register_driver(&cs5536_pci_driver); } static void __exit cs5536_exit(void) { pci_unregister_driver(&cs5536_pci_driver); } MODULE_AUTHOR("Martin K. Petersen, Bartlomiej Zolnierkiewicz"); MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, cs5536_pci_tbl); module_param_named(msr, use_msr, int, 0644); MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)"); module_init(cs5536_init); module_exit(cs5536_exit);