/* * pata_cs5536.c - CS5536 PATA for new ATA layer * (C) 2007 Martin K. Petersen <mkp@mkp.net> * * 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/blkdev.h> #include <linux/delay.h> #include <linux/libata.h> #include <scsi/scsi_host.h> #include <asm/msr.h> #define DRV_NAME "pata_cs5536" #define DRV_VERSION "0.0.7" enum { CFG = 0, DTC = 1, CAST = 2, ETC = 3, MSR_IDE_BASE = 0x51300000, MSR_IDE_CFG = (MSR_IDE_BASE + 0x10), MSR_IDE_DTC = (MSR_IDE_BASE + 0x12), MSR_IDE_CAST = (MSR_IDE_BASE + 0x13), MSR_IDE_ETC = (MSR_IDE_BASE + 0x14), PCI_IDE_CFG = 0x40, PCI_IDE_DTC = 0x48, PCI_IDE_CAST = 0x4c, PCI_IDE_ETC = 0x50, IDE_CFG_CHANEN = 0x2, IDE_CFG_CABLE = 0x10000, 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_NODMA = 0x03, }; static int use_msr; static const u32 msr_reg[4] = { MSR_IDE_CFG, MSR_IDE_DTC, MSR_IDE_CAST, MSR_IDE_ETC, }; static const u8 pci_reg[4] = { PCI_IDE_CFG, PCI_IDE_DTC, PCI_IDE_CAST, PCI_IDE_ETC, }; static inline int cs5536_read(struct pci_dev *pdev, int reg, u32 *val) { if (unlikely(use_msr)) { u32 dummy; rdmsr(msr_reg[reg], *val, dummy); return 0; } return pci_read_config_dword(pdev, pci_reg[reg], val); } static inline int cs5536_write(struct pci_dev *pdev, int reg, int val) { if (unlikely(use_msr)) { wrmsr(msr_reg[reg], val, 0); return 0; } return pci_write_config_dword(pdev, pci_reg[reg], val); } /** * cs5536_cable_detect - detect cable type * @ap: Port to detect on * * Perform cable detection for ATA66 capable cable. Return a libata * 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 << ap->port_no)) 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 dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT; int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT; u32 dtc, cast, etc; if (pair) cmdmode = min(mode, pair->pio_mode - XFER_PIO_0); cs5536_read(pdev, DTC, &dtc); cs5536_read(pdev, CAST, &cast); cs5536_read(pdev, ETC, &etc); dtc &= ~(IDE_DRV_MASK << dshift); dtc |= drv_timings[mode] << dshift; 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; etc &= ~(IDE_DRV_MASK << dshift); etc |= IDE_ETC_NODMA << dshift; cs5536_write(pdev, DTC, dtc); cs5536_write(pdev, CAST, cast); cs5536_write(pdev, ETC, etc); } /** * 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 dtc, etc; int mode = adev->dma_mode; int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT; if (mode >= XFER_UDMA_0) { cs5536_read(pdev, ETC, &etc); etc &= ~(IDE_DRV_MASK << dshift); etc |= udma_timings[mode - XFER_UDMA_0] << dshift; cs5536_write(pdev, ETC, etc); } else { /* MWDMA */ cs5536_read(pdev, DTC, &dtc); dtc &= ~(IDE_DRV_MASK << dshift); dtc |= mwdma_timings[mode - XFER_MW_DMA_0] << dshift; cs5536_write(pdev, DTC, dtc); } } static struct scsi_host_template cs5536_sht = { ATA_BMDMA_SHT(DRV_NAME), }; static struct ata_port_operations cs5536_port_ops = { .inherits = &ata_bmdma_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, }; const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; u32 cfg; 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_sff_init_one(dev, ppi, &cs5536_sht, NULL); } 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 }; 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"); MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, cs5536); MODULE_VERSION(DRV_VERSION); 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);