/* * pata_cs5536.c - CS5536 PATA for new ATA layer * (C) 2007 Martin K. Petersen <mkp@mkp.net> * (C) 2011 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/blkdev.h> #include <linux/delay.h> #include <linux/libata.h> #include <scsi/scsi_host.h> #include <linux/dmi.h> #ifdef CONFIG_X86_32 #include <asm/msr.h> static int use_msr; module_param_named(msr, use_msr, int, 0644); MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)"); #else #undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */ #undef wrmsr #define rdmsr(x, y, z) do { } while (0) #define wrmsr(x, y, z) do { } while (0) #define use_msr 0 #endif #define DRV_NAME "pata_cs5536" #define DRV_VERSION "0.0.8" 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_MASK = 0xff, IDE_CAST_CMD_SHIFT = 24, IDE_ETC_UDMA_MASK = 0xc0, }; /* Some Bachmann OT200 devices have a non working UDMA support due a * missing resistor. */ static const struct dmi_system_id udma_quirk_dmi_table[] = { { .ident = "Bachmann electronic OT200", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"), DMI_MATCH(DMI_PRODUCT_NAME, "OT200"), DMI_MATCH(DMI_PRODUCT_VERSION, "1") }, }, { } }; static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val) { if (unlikely(use_msr)) { u32 dummy __maybe_unused; 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(struct ata_device *adev, u8 tim) { struct pci_dev *pdev = to_pci_dev(adev->link->ap->host->dev); int dshift = adev->devno ? 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 * @ap: Port to detect on * * Perform cable detection for ATA66 capable cable. * * Returns a cable type. */ static int cs5536_cable_detect(struct ata_port *ap) { struct pci_dev *pdev = to_pci_dev(ap->host->dev); u32 cfg; cs5536_read(pdev, CFG, &cfg); if (cfg & IDE_CFG_CABLE) return ATA_CBL_PATA80; else return ATA_CBL_PATA40; } /** * cs5536_set_piomode - PIO setup * @ap: ATA interface * @adev: device on the interface */ static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev) { 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(ap->host->dev); struct ata_device *pair = ata_dev_pair(adev); int mode = adev->pio_mode - XFER_PIO_0; int cmdmode = mode; int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT; u32 cast; if (pair) cmdmode = min(mode, pair->pio_mode - XFER_PIO_0); cs5536_program_dtc(adev, drv_timings[mode]); cs5536_read(pdev, CAST, &cast); cast &= ~(IDE_CAST_DRV_MASK << cshift); cast |= addr_timings[mode] << cshift; cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT); cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT; cs5536_write(pdev, CAST, cast); } /** * cs5536_set_dmamode - DMA timing setup * @ap: ATA interface * @adev: Device being configured * */ static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev) { 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(ap->host->dev); u32 etc; int mode = adev->dma_mode; int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT; 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); cs5536_program_dtc(adev, mwdma_timings[mode - XFER_MW_DMA_0]); } cs5536_write(pdev, ETC, etc); } static struct scsi_host_template cs5536_sht = { ATA_BMDMA_SHT(DRV_NAME), }; static struct ata_port_operations cs5536_port_ops = { .inherits = &ata_bmdma32_port_ops, .cable_detect = cs5536_cable_detect, .set_piomode = cs5536_set_piomode, .set_dmamode = cs5536_set_dmamode, }; /** * 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) { static const struct ata_port_info info = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .udma_mask = ATA_UDMA5, .port_ops = &cs5536_port_ops, }; static const struct ata_port_info no_udma_info = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, .port_ops = &cs5536_port_ops, }; const struct ata_port_info *ppi[2]; u32 cfg; if (dmi_check_system(udma_quirk_dmi_table)) ppi[0] = &no_udma_info; else ppi[0] = &info; ppi[1] = &ata_dummy_port_info; if (use_msr) printk(KERN_ERR 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 ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0); } static const struct pci_device_id cs5536[] = { { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), }, { }, }; static struct pci_driver cs5536_pci_driver = { .name = DRV_NAME, .id_table = cs5536, .probe = cs5536_init_one, .remove = ata_pci_remove_one, #ifdef CONFIG_PM .suspend = ata_pci_device_suspend, .resume = ata_pci_device_resume, #endif }; module_pci_driver(cs5536_pci_driver); MODULE_AUTHOR("Martin K. Petersen"); MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, cs5536); MODULE_VERSION(DRV_VERSION);