ide: add CS5536 host driver (v3)

This is a port of libata's pata_cs5536.c (written by Martin K. Petersen)
to IDE subsystem.

Changes done while at it:

* Reprogram PIO/MWDMA timings if needed before and after DMA transfer
  (chipset uses shared PIO/MWDMA timings).

* Fix cable detection to report 80-wires cable if BIOS set it for any
  device on a port (IDE core will do drive-side cable detection later).

* Don't disable UDMA while programming PIO timings.

* Simplify PCI/MSR support.

Pros of having IDE host driver in addition to libata's one:

* IDE is much lighter than SCSI+libata, the host driver itself is also
  a bit smaller:

   text    data     bss     dec     hex filename
   1261     496       4    1761     6e1 drivers/ata/pata_cs5536.o
   1242     128       4    1374     55e drivers/ide/cs5536.o

* This allows use of IDE features which are unavailable under libata.

v2:
* Fixes per review from Sergei:
  - simplify dependency check in Kconfig
  - use IDE_DRV_MASK also for ->drive_data
  - disable UDMA when programming MWDMA
  - program new DTC timings only when necessary
  - fix printk() level in cs5536_init_one()

* Fix patch description according to comments from Alan and Sergei.

v3:
* Smarter masking of UDMA bits per Sergei's suggestion.

Cc: Martin K. Petersen <mkp@mkp.net>
Cc: Karl Auerbach <karl@iwl.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 319 insertions, 0 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index b1c6f68d98c..3dad2299d9c 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -465,6 +465,16 @@ config BLK_DEV_CS5535
 
           It is safe to say Y to this question.
 
+config BLK_DEV_CS5536
+        tristate "CS5536 chipset support"
+        depends on X86_32
+        select BLK_DEV_IDEDMA_PCI
+        help
+          This option enables support for the AMD CS5536
+          companion chip used with the Geode LX processor family.
+
+          If unsure, say N.
+
 config BLK_DEV_HPT366
         tristate "HPT36X/37X chipset support"
         select BLK_DEV_IDEDMA_PCI
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index c2b9c93f009..d0e3d7d5b46 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_BLK_DEV_CMD64X)		+= cmd64x.o
 obj-$(CONFIG_BLK_DEV_CS5520)            += cs5520.o
 obj-$(CONFIG_BLK_DEV_CS5530)            += cs5530.o
 obj-$(CONFIG_BLK_DEV_CS5535)            += cs5535.o
+obj-$(CONFIG_BLK_DEV_CS5536)            += cs5536.o
 obj-$(CONFIG_BLK_DEV_SC1200)            += sc1200.o
 obj-$(CONFIG_BLK_DEV_CY82C693)          += cy82c693.o
 obj-$(CONFIG_BLK_DEV_DELKIN)            += delkin_cb.o
diff --git a/drivers/ide/cs5536.c b/drivers/ide/cs5536.c
new file mode 100644
index 00000000000..7a62db719a4
--- /dev/null
+++ b/drivers/ide/cs5536.c
@@ -0,0 +1,308 @@
+/*
+ * 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;
+        u32 cast;
+        u8 cmd_pio = pio;
+
+        if (pair)
+                cmd_pio = min(pio, ide_get_best_pio_mode(pair, 255, 4));
+
+        drive->drive_data &= (IDE_DRV_MASK << 8);
+        drive->drive_data |= drv_timings[pio];
+
+        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;
+        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);
+                drive->drive_data &= IDE_DRV_MASK;
+                drive->drive_data |= mwdma_timings[mode - XFER_MW_DMA_0] << 8;
+        }
+
+        cs5536_write(pdev, ETC, etc);
+}
+
+static void cs5536_dma_start(ide_drive_t *drive)
+{
+        if (drive->current_speed < XFER_UDMA_0 &&
+            (drive->drive_data >> 8) != (drive->drive_data & IDE_DRV_MASK))
+                cs5536_program_dtc(drive, drive->drive_data >> 8);
+
+        ide_dma_start(drive);
+}
+
+static int cs5536_dma_end(ide_drive_t *drive)
+{
+        int ret = ide_dma_end(drive);
+
+        if (drive->current_speed < XFER_UDMA_0 &&
+            (drive->drive_data >> 8) != (drive->drive_data & IDE_DRV_MASK))
+                cs5536_program_dtc(drive, drive->drive_data & 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_exec_cmd           = ide_dma_exec_cmd,
+        .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_timeout            = ide_dma_timeout,
+};
+
+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);