linux/drivers/ata/pata_cs5535.c
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   1/*
   2 * pata-cs5535.c        - CS5535 PATA for new ATA layer
   3 *                        (C) 2005-2006 Red Hat Inc
   4 *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
   5 *
   6 * based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and
   7 * made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de
   8 * and Alexander Kiausch <alex.kiausch@t-online.de>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22 *
  23 * Loosely based on the piix & svwks drivers.
  24 *
  25 * Documentation:
  26 *      Available from AMD web site.
  27 * TODO
  28 *      Review errata to see if serializing is necessary
  29 */
  30
  31#include <linux/kernel.h>
  32#include <linux/module.h>
  33#include <linux/pci.h>
  34#include <linux/init.h>
  35#include <linux/blkdev.h>
  36#include <linux/delay.h>
  37#include <scsi/scsi_host.h>
  38#include <linux/libata.h>
  39#include <asm/msr.h>
  40
  41#define DRV_NAME        "cs5535"
  42#define DRV_VERSION     "0.2.12"
  43
  44/*
  45 *      The Geode (Aka Athlon GX now) uses an internal MSR based
  46 *      bus system for control. Demented but there you go.
  47 */
  48
  49#define MSR_ATAC_BASE           0x51300000
  50#define ATAC_GLD_MSR_CAP        (MSR_ATAC_BASE+0)
  51#define ATAC_GLD_MSR_CONFIG    (MSR_ATAC_BASE+0x01)
  52#define ATAC_GLD_MSR_SMI       (MSR_ATAC_BASE+0x02)
  53#define ATAC_GLD_MSR_ERROR     (MSR_ATAC_BASE+0x03)
  54#define ATAC_GLD_MSR_PM        (MSR_ATAC_BASE+0x04)
  55#define ATAC_GLD_MSR_DIAG      (MSR_ATAC_BASE+0x05)
  56#define ATAC_IO_BAR            (MSR_ATAC_BASE+0x08)
  57#define ATAC_RESET             (MSR_ATAC_BASE+0x10)
  58#define ATAC_CH0D0_PIO         (MSR_ATAC_BASE+0x20)
  59#define ATAC_CH0D0_DMA         (MSR_ATAC_BASE+0x21)
  60#define ATAC_CH0D1_PIO         (MSR_ATAC_BASE+0x22)
  61#define ATAC_CH0D1_DMA         (MSR_ATAC_BASE+0x23)
  62#define ATAC_PCI_ABRTERR       (MSR_ATAC_BASE+0x24)
  63
  64#define ATAC_BM0_CMD_PRIM      0x00
  65#define ATAC_BM0_STS_PRIM      0x02
  66#define ATAC_BM0_PRD           0x04
  67
  68#define CS5535_CABLE_DETECT    0x48
  69
  70#define CS5535_BAD_PIO(timings) ( (timings&~0x80000000UL)==0x00009172 )
  71
  72/**
  73 *      cs5535_cable_detect     -       detect cable type
  74 *      @ap: Port to detect on
  75 *
  76 *      Perform cable detection for ATA66 capable cable. Return a libata
  77 *      cable type.
  78 */
  79
  80static int cs5535_cable_detect(struct ata_port *ap)
  81{
  82        u8 cable;
  83        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  84
  85        pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
  86        if (cable & 1)
  87                return ATA_CBL_PATA80;
  88        else
  89                return ATA_CBL_PATA40;
  90}
  91
  92/**
  93 *      cs5535_set_piomode              -       PIO setup
  94 *      @ap: ATA interface
  95 *      @adev: device on the interface
  96 *
  97 *      Set our PIO requirements. The CS5535 is pretty clean about all this
  98 */
  99
 100static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
 101{
 102        static const u16 pio_timings[5] = {
 103                0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 104        };
 105        static const u16 pio_cmd_timings[5] = {
 106                0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 107        };
 108        u32 reg, dummy;
 109        struct ata_device *pair = ata_dev_pair(adev);
 110
 111        int mode = adev->pio_mode - XFER_PIO_0;
 112        int cmdmode = mode;
 113
 114        /* Command timing has to be for the lowest of the pair of devices */
 115        if (pair) {
 116                int pairmode = pair->pio_mode - XFER_PIO_0;
 117                cmdmode = min(mode, pairmode);
 118                /* Write the other drive timing register if it changed */
 119                if (cmdmode < pairmode)
 120                        wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
 121                                pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
 122        }
 123        /* Write the drive timing register */
 124        wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
 125                pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
 126
 127        /* Set the PIO "format 1" bit in the DMA timing register */
 128        rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 129        wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
 130}
 131
 132/**
 133 *      cs5535_set_dmamode              -       DMA timing setup
 134 *      @ap: ATA interface
 135 *      @adev: Device being configured
 136 *
 137 */
 138
 139static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 140{
 141        static const u32 udma_timings[5] = {
 142                0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
 143        };
 144        static const u32 mwdma_timings[3] = {
 145                0x7F0FFFF3, 0x7F035352, 0x7F024241
 146        };
 147        u32 reg, dummy;
 148        int mode = adev->dma_mode;
 149
 150        rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 151        reg &= 0x80000000UL;
 152        if (mode >= XFER_UDMA_0)
 153                reg |= udma_timings[mode - XFER_UDMA_0];
 154        else
 155                reg |= mwdma_timings[mode - XFER_MW_DMA_0];
 156        wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
 157}
 158
 159static struct scsi_host_template cs5535_sht = {
 160        ATA_BMDMA_SHT(DRV_NAME),
 161};
 162
 163static struct ata_port_operations cs5535_port_ops = {
 164        .inherits       = &ata_bmdma_port_ops,
 165        .cable_detect   = cs5535_cable_detect,
 166        .set_piomode    = cs5535_set_piomode,
 167        .set_dmamode    = cs5535_set_dmamode,
 168};
 169
 170/**
 171 *      cs5535_init_one         -       Initialise a CS5530
 172 *      @dev: PCI device
 173 *      @id: Entry in match table
 174 *
 175 *      Install a driver for the newly found CS5530 companion chip. Most of
 176 *      this is just housekeeping. We have to set the chip up correctly and
 177 *      turn off various bits of emulation magic.
 178 */
 179
 180static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 181{
 182        static const struct ata_port_info info = {
 183                .flags = ATA_FLAG_SLAVE_POSS,
 184                .pio_mask = 0x1f,
 185                .mwdma_mask = 0x07,
 186                .udma_mask = ATA_UDMA4,
 187                .port_ops = &cs5535_port_ops
 188        };
 189        const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 190
 191        u32 timings, dummy;
 192
 193        /* Check the BIOS set the initial timing clock. If not set the
 194           timings for PIO0 */
 195        rdmsr(ATAC_CH0D0_PIO, timings, dummy);
 196        if (CS5535_BAD_PIO(timings))
 197                wrmsr(ATAC_CH0D0_PIO, 0xF7F4F7F4UL, 0);
 198        rdmsr(ATAC_CH0D1_PIO, timings, dummy);
 199        if (CS5535_BAD_PIO(timings))
 200                wrmsr(ATAC_CH0D1_PIO, 0xF7F4F7F4UL, 0);
 201        return ata_pci_sff_init_one(dev, ppi, &cs5535_sht, NULL);
 202}
 203
 204static const struct pci_device_id cs5535[] = {
 205        { PCI_VDEVICE(NS, 0x002D), },
 206
 207        { },
 208};
 209
 210static struct pci_driver cs5535_pci_driver = {
 211        .name           = DRV_NAME,
 212        .id_table       = cs5535,
 213        .probe          = cs5535_init_one,
 214        .remove         = ata_pci_remove_one,
 215#ifdef CONFIG_PM
 216        .suspend        = ata_pci_device_suspend,
 217        .resume         = ata_pci_device_resume,
 218#endif
 219};
 220
 221static int __init cs5535_init(void)
 222{
 223        return pci_register_driver(&cs5535_pci_driver);
 224}
 225
 226static void __exit cs5535_exit(void)
 227{
 228        pci_unregister_driver(&cs5535_pci_driver);
 229}
 230
 231MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
 232MODULE_DESCRIPTION("low-level driver for the NS/AMD 5530");
 233MODULE_LICENSE("GPL");
 234MODULE_DEVICE_TABLE(pci, cs5535);
 235MODULE_VERSION(DRV_VERSION);
 236
 237module_init(cs5535_init);
 238module_exit(cs5535_exit);
 239