drivers/ata/pata_cs5535.c

   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
  80 static 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
 100 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
 101 {
 102         static const u16 pio_timings[5] = {
 103                 0xF7F4, 0xF173, 0x8141, 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
 139 static 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
 159 static struct scsi_host_template cs5535_sht = {
 160         ATA_BMDMA_SHT(DRV_NAME),
 161 };
 162
 163 static 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
 180 static 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 = ATA_PIO4,
 185                 .mwdma_mask = ATA_MWDMA2,
 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_bmdma_init_one(dev, ppi, &cs5535_sht, NULL, 0);
 202 }
 203
 204 static const struct pci_device_id cs5535[] = {
 205         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), },
 206         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), },
 207
 208         { },
 209 };
 210
 211 static struct pci_driver cs5535_pci_driver = {
 212         .name           = DRV_NAME,
 213         .id_table       = cs5535,
 214         .probe          = cs5535_init_one,
 215         .remove         = ata_pci_remove_one,
 216 #ifdef CONFIG_PM
 217         .suspend        = ata_pci_device_suspend,
 218         .resume         = ata_pci_device_resume,
 219 #endif
 220 };
 221
 222 static int __init cs5535_init(void)
 223 {
 224         return pci_register_driver(&cs5535_pci_driver);
 225 }
 226
 227 static void __exit cs5535_exit(void)
 228 {
 229         pci_unregister_driver(&cs5535_pci_driver);
 230 }
 231
 232 MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
 233 MODULE_DESCRIPTION("low-level driver for the NS/AMD 5530");
 234 MODULE_LICENSE("GPL");
 235 MODULE_DEVICE_TABLE(pci, cs5535);
 236 MODULE_VERSION(DRV_VERSION);
 237
 238 module_init(cs5535_init);
 239 module_exit(cs5535_exit);