3 files changed, 356 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 4672066167e3..33f5eb038773 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -272,6 +272,15 @@ config PATA_CS5535
 
           If unsure, say N.
 
+config PATA_CS5536
+        tristate "CS5536 PATA support (Experimental)"
+        depends on PCI && X86 && !X86_64 && EXPERIMENTAL
+        help
+          This option enables support for the AMD CS5536
+          companion chip used with the Geode LX processor family.
+
+          If unsure, say N.
+
 config PATA_CYPRESS
         tristate "Cypress CY82C693 PATA support (Very Experimental)"
         depends on PCI && EXPERIMENTAL
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 2a63645003eb..6bdc307649e6 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_PATA_CMD64X)	+= pata_cmd64x.o
 obj-$(CONFIG_PATA_CS5520)       += pata_cs5520.o
 obj-$(CONFIG_PATA_CS5530)       += pata_cs5530.o
 obj-$(CONFIG_PATA_CS5535)       += pata_cs5535.o
+obj-$(CONFIG_PATA_CS5536)       += pata_cs5536.o
 obj-$(CONFIG_PATA_CYPRESS)      += pata_cypress.o
 obj-$(CONFIG_PATA_EFAR)         += pata_efar.o
 obj-$(CONFIG_PATA_HPT366)       += pata_hpt366.o
diff --git a/drivers/ata/pata_cs5536.c b/drivers/ata/pata_cs5536.c
new file mode 100644
index 000000000000..21405bf14837
--- /dev/null
+++ b/drivers/ata/pata_cs5536.c
@@ -0,0 +1,346 @@
+/*
+ * 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     "0.0.5"
+
+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, int *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
+ *      @deadline: deadline jiffies for the operation
+ *
+ *      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 = ap->port_no ? IDE_D1_SHIFT : IDE_D0_SHIFT;
+        int cshift = ap->port_no ? 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 = ap->port_no ? 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] << dshift;
+
+                cs5536_write(pdev, DTC, dtc);
+        }
+}
+
+static struct scsi_host_template cs5536_sht = {
+        .module                 = THIS_MODULE,
+        .name                   = DRV_NAME,
+        .ioctl                  = ata_scsi_ioctl,
+        .queuecommand           = ata_scsi_queuecmd,
+        .can_queue              = ATA_DEF_QUEUE,
+        .this_id                = ATA_SHT_THIS_ID,
+        .sg_tablesize           = LIBATA_MAX_PRD,
+        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
+        .emulated               = ATA_SHT_EMULATED,
+        .use_clustering         = ATA_SHT_USE_CLUSTERING,
+        .proc_name              = DRV_NAME,
+        .dma_boundary           = ATA_DMA_BOUNDARY,
+        .slave_configure        = ata_scsi_slave_config,
+        .slave_destroy          = ata_scsi_slave_destroy,
+        .bios_param             = ata_std_bios_param,
+};
+
+static struct ata_port_operations cs5536_port_ops = {
+        .port_disable           = ata_port_disable,
+        .set_piomode            = cs5536_set_piomode,
+        .set_dmamode            = cs5536_set_dmamode,
+        .mode_filter            = ata_pci_default_filter,
+
+        .tf_load                = ata_tf_load,
+        .tf_read                = ata_tf_read,
+        .check_status           = ata_check_status,
+        .exec_command           = ata_exec_command,
+        .dev_select             = ata_std_dev_select,
+
+        .freeze                 = ata_bmdma_freeze,
+        .thaw                   = ata_bmdma_thaw,
+        .error_handler          = ata_bmdma_error_handler,
+        .post_internal_cmd      = ata_bmdma_post_internal_cmd,
+        .cable_detect           = cs5536_cable_detect,
+
+        .bmdma_setup            = ata_bmdma_setup,
+        .bmdma_start            = ata_bmdma_start,
+        .bmdma_stop             = ata_bmdma_stop,
+        .bmdma_status           = ata_bmdma_status,
+
+        .qc_prep                = ata_qc_prep,
+        .qc_issue               = ata_qc_issue_prot,
+
+        .data_xfer              = ata_data_xfer,
+
+        .irq_handler            = ata_interrupt,
+        .irq_clear              = ata_bmdma_irq_clear,
+        .irq_on                 = ata_irq_on,
+        .irq_ack                = ata_irq_ack,
+
+        .port_start             = ata_port_start,
+};
+
+/**
+ *      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 = {
+                .sht = &cs5536_sht,
+                .flags = ATA_FLAG_SLAVE_POSS,
+                .pio_mask = 0x1f,
+                .mwdma_mask = 0x07,
+                .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_init_one(dev, ppi);
+}
+
+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);