302 lines
7.0 KiB
C
302 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* pata_cs5536.c - CS5536 PATA for new ATA layer
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* (C) 2007 Martin K. Petersen <mkp@mkp.net>
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* (C) 2011 Bartlomiej Zolnierkiewicz
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*
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* Documentation:
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* Available from AMD web site.
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*
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* The IDE timing registers for the CS5536 live in the Geode Machine
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* Specific Register file and not PCI config space. Most BIOSes
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* virtualize the PCI registers so the chip looks like a standard IDE
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* controller. Unfortunately not all implementations get this right.
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* In particular some have problems with unaligned accesses to the
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* virtualized PCI registers. This driver always does full dword
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* writes to work around the issue. Also, in case of a bad BIOS this
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* driver can be loaded with the "msr=1" parameter which forces using
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* the Machine Specific Registers to configure the device.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/libata.h>
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#include <scsi/scsi_host.h>
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#include <linux/dmi.h>
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#ifdef CONFIG_X86_32
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#include <asm/msr.h>
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static int use_msr;
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module_param_named(msr, use_msr, int, 0644);
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MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
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#else
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#undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */
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#undef wrmsr
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#define rdmsr(x, y, z) do { } while (0)
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#define wrmsr(x, y, z) do { } while (0)
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#define use_msr 0
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#endif
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#define DRV_NAME "pata_cs5536"
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#define DRV_VERSION "0.0.8"
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enum {
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MSR_IDE_CFG = 0x51300010,
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PCI_IDE_CFG = 0x40,
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CFG = 0,
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DTC = 2,
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CAST = 3,
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ETC = 4,
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IDE_CFG_CHANEN = (1 << 1),
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IDE_CFG_CABLE = (1 << 17) | (1 << 16),
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IDE_D0_SHIFT = 24,
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IDE_D1_SHIFT = 16,
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IDE_DRV_MASK = 0xff,
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IDE_CAST_D0_SHIFT = 6,
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IDE_CAST_D1_SHIFT = 4,
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IDE_CAST_DRV_MASK = 0x3,
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IDE_CAST_CMD_MASK = 0xff,
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IDE_CAST_CMD_SHIFT = 24,
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IDE_ETC_UDMA_MASK = 0xc0,
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};
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/* Some Bachmann OT200 devices have a non working UDMA support due a
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* missing resistor.
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*/
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static const struct dmi_system_id udma_quirk_dmi_table[] = {
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{
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.ident = "Bachmann electronic OT200",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"),
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DMI_MATCH(DMI_PRODUCT_NAME, "OT200"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "1")
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},
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},
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{ }
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};
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static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
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{
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if (unlikely(use_msr)) {
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u32 dummy __maybe_unused;
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rdmsr(MSR_IDE_CFG + reg, *val, dummy);
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return 0;
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}
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return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
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}
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static int cs5536_write(struct pci_dev *pdev, int reg, int val)
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{
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if (unlikely(use_msr)) {
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wrmsr(MSR_IDE_CFG + reg, val, 0);
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return 0;
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}
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return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
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}
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static void cs5536_program_dtc(struct ata_device *adev, u8 tim)
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{
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struct pci_dev *pdev = to_pci_dev(adev->link->ap->host->dev);
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int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
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u32 dtc;
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cs5536_read(pdev, DTC, &dtc);
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dtc &= ~(IDE_DRV_MASK << dshift);
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dtc |= tim << dshift;
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cs5536_write(pdev, DTC, dtc);
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}
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/**
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* cs5536_cable_detect - detect cable type
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* @ap: Port to detect on
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*
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* Perform cable detection for ATA66 capable cable.
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*
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* Returns a cable type.
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*/
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static int cs5536_cable_detect(struct ata_port *ap)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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u32 cfg;
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cs5536_read(pdev, CFG, &cfg);
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if (cfg & IDE_CFG_CABLE)
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return ATA_CBL_PATA80;
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else
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return ATA_CBL_PATA40;
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}
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/**
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* cs5536_set_piomode - PIO setup
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* @ap: ATA interface
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* @adev: device on the interface
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*/
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static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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static const u8 drv_timings[5] = {
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0x98, 0x55, 0x32, 0x21, 0x20,
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};
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static const u8 addr_timings[5] = {
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0x2, 0x1, 0x0, 0x0, 0x0,
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};
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static const u8 cmd_timings[5] = {
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0x99, 0x92, 0x90, 0x22, 0x20,
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};
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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struct ata_device *pair = ata_dev_pair(adev);
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int mode = adev->pio_mode - XFER_PIO_0;
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int cmdmode = mode;
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int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
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u32 cast;
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if (pair)
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cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
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cs5536_program_dtc(adev, drv_timings[mode]);
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cs5536_read(pdev, CAST, &cast);
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cast &= ~(IDE_CAST_DRV_MASK << cshift);
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cast |= addr_timings[mode] << cshift;
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cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
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cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
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cs5536_write(pdev, CAST, cast);
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}
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/**
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* cs5536_set_dmamode - DMA timing setup
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* @ap: ATA interface
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* @adev: Device being configured
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*
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*/
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static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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{
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static const u8 udma_timings[6] = {
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0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
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};
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static const u8 mwdma_timings[3] = {
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0x67, 0x21, 0x20,
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};
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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u32 etc;
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int mode = adev->dma_mode;
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int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
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cs5536_read(pdev, ETC, &etc);
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if (mode >= XFER_UDMA_0) {
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etc &= ~(IDE_DRV_MASK << dshift);
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etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
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} else { /* MWDMA */
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etc &= ~(IDE_ETC_UDMA_MASK << dshift);
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cs5536_program_dtc(adev, mwdma_timings[mode - XFER_MW_DMA_0]);
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}
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cs5536_write(pdev, ETC, etc);
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}
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static struct scsi_host_template cs5536_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations cs5536_port_ops = {
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.inherits = &ata_bmdma32_port_ops,
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.cable_detect = cs5536_cable_detect,
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.set_piomode = cs5536_set_piomode,
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.set_dmamode = cs5536_set_dmamode,
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};
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/**
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* cs5536_init_one
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* @dev: PCI device
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* @id: Entry in match table
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*
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*/
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static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = ATA_PIO4,
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.mwdma_mask = ATA_MWDMA2,
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.udma_mask = ATA_UDMA5,
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.port_ops = &cs5536_port_ops,
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};
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static const struct ata_port_info no_udma_info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = ATA_PIO4,
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.port_ops = &cs5536_port_ops,
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};
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const struct ata_port_info *ppi[2];
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u32 cfg;
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if (dmi_check_system(udma_quirk_dmi_table))
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ppi[0] = &no_udma_info;
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else
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ppi[0] = &info;
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ppi[1] = &ata_dummy_port_info;
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if (use_msr)
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printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
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cs5536_read(dev, CFG, &cfg);
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if ((cfg & IDE_CFG_CHANEN) == 0) {
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printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
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return -ENODEV;
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}
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return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
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}
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static const struct pci_device_id cs5536[] = {
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{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
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{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_DEV_IDE), },
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{ },
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};
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static struct pci_driver cs5536_pci_driver = {
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.name = DRV_NAME,
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.id_table = cs5536,
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.probe = cs5536_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM_SLEEP
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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module_pci_driver(cs5536_pci_driver);
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MODULE_AUTHOR("Martin K. Petersen");
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MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, cs5536);
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MODULE_VERSION(DRV_VERSION);
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