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/blkdev.h>
  35 #include <linux/delay.h>
  36 #include <scsi/scsi_host.h>
  37 #include <linux/libata.h>
  38 #include <asm/msr.h>
  39
  40 #define DRV_NAME        "pata_cs5535"
  41 #define DRV_VERSION     "0.2.12"
  42
  43 /*
  44  *      The Geode (Aka Athlon GX now) uses an internal MSR based
  45  *      bus system for control. Demented but there you go.
  46  */
  47
  48 #define MSR_ATAC_BASE           0x51300000
  49 #define ATAC_GLD_MSR_CAP        (MSR_ATAC_BASE+0)
  50 #define ATAC_GLD_MSR_CONFIG    (MSR_ATAC_BASE+0x01)
  51 #define ATAC_GLD_MSR_SMI       (MSR_ATAC_BASE+0x02)
  52 #define ATAC_GLD_MSR_ERROR     (MSR_ATAC_BASE+0x03)
  53 #define ATAC_GLD_MSR_PM        (MSR_ATAC_BASE+0x04)
  54 #define ATAC_GLD_MSR_DIAG      (MSR_ATAC_BASE+0x05)
  55 #define ATAC_IO_BAR            (MSR_ATAC_BASE+0x08)
  56 #define ATAC_RESET             (MSR_ATAC_BASE+0x10)
  57 #define ATAC_CH0D0_PIO         (MSR_ATAC_BASE+0x20)
  58 #define ATAC_CH0D0_DMA         (MSR_ATAC_BASE+0x21)
  59 #define ATAC_CH0D1_PIO         (MSR_ATAC_BASE+0x22)
  60 #define ATAC_CH0D1_DMA         (MSR_ATAC_BASE+0x23)
  61 #define ATAC_PCI_ABRTERR       (MSR_ATAC_BASE+0x24)
  62
  63 #define ATAC_BM0_CMD_PRIM      0x00
  64 #define ATAC_BM0_STS_PRIM      0x02
  65 #define ATAC_BM0_PRD           0x04
  66
  67 #define CS5535_CABLE_DETECT    0x48
  68
  69 /**
  70  *      cs5535_cable_detect     -       detect cable type
  71  *      @ap: Port to detect on
  72  *
  73  *      Perform cable detection for ATA66 capable cable. Return a libata
  74  *      cable type.
  75  */
  76
  77 static int cs5535_cable_detect(struct ata_port *ap)
  78 {
  79         u8 cable;
  80         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  81
  82         pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
  83         if (cable & 1)
  84                 return ATA_CBL_PATA80;
  85         else
  86                 return ATA_CBL_PATA40;
  87 }
  88
  89 /**
  90  *      cs5535_set_piomode              -       PIO setup
  91  *      @ap: ATA interface
  92  *      @adev: device on the interface
  93  *
  94  *      Set our PIO requirements. The CS5535 is pretty clean about all this
  95  */
  96
  97 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
  98 {
  99         static const u16 pio_timings[5] = {
 100                 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131
 101         };
 102         static const u16 pio_cmd_timings[5] = {
 103                 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 104         };
 105         u32 reg, dummy;
 106         struct ata_device *pair = ata_dev_pair(adev);
 107
 108         int mode = adev->pio_mode - XFER_PIO_0;
 109         int cmdmode = mode;
 110
 111         /* Command timing has to be for the lowest of the pair of devices */
 112         if (pair) {
 113                 int pairmode = pair->pio_mode - XFER_PIO_0;
 114                 cmdmode = min(mode, pairmode);
 115                 /* Write the other drive timing register if it changed */
 116                 if (cmdmode < pairmode)
 117                         wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
 118                                 pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
 119         }
 120         /* Write the drive timing register */
 121         wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
 122                 pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
 123
 124         /* Set the PIO "format 1" bit in the DMA timing register */
 125         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 126         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
 127 }
 128
 129 /**
 130  *      cs5535_set_dmamode              -       DMA timing setup
 131  *      @ap: ATA interface
 132  *      @adev: Device being configured
 133  *
 134  */
 135
 136 static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 137 {
 138         static const u32 udma_timings[5] = {
 139                 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
 140         };
 141         static const u32 mwdma_timings[3] = {
 142                 0x7F0FFFF3, 0x7F035352, 0x7F024241
 143         };
 144         u32 reg, dummy;
 145         int mode = adev->dma_mode;
 146
 147         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 148         reg &= 0x80000000UL;
 149         if (mode >= XFER_UDMA_0)
 150                 reg |= udma_timings[mode - XFER_UDMA_0];
 151         else
 152                 reg |= mwdma_timings[mode - XFER_MW_DMA_0];
 153         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
 154 }
 155
 156 static struct scsi_host_template cs5535_sht = {
 157         ATA_BMDMA_SHT(DRV_NAME),
 158 };
 159
 160 static struct ata_port_operations cs5535_port_ops = {
 161         .inherits       = &ata_bmdma_port_ops,
 162         .cable_detect   = cs5535_cable_detect,
 163         .set_piomode    = cs5535_set_piomode,
 164         .set_dmamode    = cs5535_set_dmamode,
 165 };
 166
 167 /**
 168  *      cs5535_init_one         -       Initialise a CS5530
 169  *      @dev: PCI device
 170  *      @id: Entry in match table
 171  *
 172  *      Install a driver for the newly found CS5530 companion chip. Most of
 173  *      this is just housekeeping. We have to set the chip up correctly and
 174  *      turn off various bits of emulation magic.
 175  */
 176
 177 static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 178 {
 179         static const struct ata_port_info info = {
 180                 .flags = ATA_FLAG_SLAVE_POSS,
 181                 .pio_mask = ATA_PIO4,
 182                 .mwdma_mask = ATA_MWDMA2,
 183                 .udma_mask = ATA_UDMA4,
 184                 .port_ops = &cs5535_port_ops
 185         };
 186         const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 187
 188         return ata_pci_bmdma_init_one(dev, ppi, &cs5535_sht, NULL, 0);
 189 }
 190
 191 static const struct pci_device_id cs5535[] = {
 192         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), },
 193         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), },
 194
 195         { },
 196 };
 197
 198 static struct pci_driver cs5535_pci_driver = {
 199         .name           = DRV_NAME,
 200         .id_table       = cs5535,
 201         .probe          = cs5535_init_one,
 202         .remove         = ata_pci_remove_one,
 203 #ifdef CONFIG_PM
 204         .suspend        = ata_pci_device_suspend,
 205         .resume         = ata_pci_device_resume,
 206 #endif
 207 };
 208
 209 module_pci_driver(cs5535_pci_driver);
 210
 211 MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
 212 MODULE_DESCRIPTION("low-level driver for the NS/AMD 5535");
 213 MODULE_LICENSE("GPL");
 214 MODULE_DEVICE_TABLE(pci, cs5535);
 215 MODULE_VERSION(DRV_VERSION);