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@redhat.com>
   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  *      @deadline: deadline jiffies for the operation
  76  *
  77  *      Perform cable detection for ATA66 capable cable. Return a libata
  78  *      cable type.
  79  */
  80
  81 static int cs5535_cable_detect(struct ata_port *ap)
  82 {
  83         u8 cable;
  84         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  85
  86         pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
  87         if (cable & 1)
  88                 return ATA_CBL_PATA80;
  89         else
  90                 return ATA_CBL_PATA40;
  91 }
  92
  93 /**
  94  *      cs5535_set_piomode              -       PIO setup
  95  *      @ap: ATA interface
  96  *      @adev: device on the interface
  97  *
  98  *      Set our PIO requirements. The CS5535 is pretty clean about all this
  99  */
 100
 101 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
 102 {
 103         static const u16 pio_timings[5] = {
 104                 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 105         };
 106         static const u16 pio_cmd_timings[5] = {
 107                 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 108         };
 109         u32 reg, dummy;
 110         struct ata_device *pair = ata_dev_pair(adev);
 111
 112         int mode = adev->pio_mode - XFER_PIO_0;
 113         int cmdmode = mode;
 114
 115         /* Command timing has to be for the lowest of the pair of devices */
 116         if (pair) {
 117                 int pairmode = pair->pio_mode - XFER_PIO_0;
 118                 cmdmode = min(mode, pairmode);
 119                 /* Write the other drive timing register if it changed */
 120                 if (cmdmode < pairmode)
 121                         wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
 122                                 pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
 123         }
 124         /* Write the drive timing register */
 125         wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
 126                 pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
 127
 128         /* Set the PIO "format 1" bit in the DMA timing register */
 129         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 130         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
 131 }
 132
 133 /**
 134  *      cs5535_set_dmamode              -       DMA timing setup
 135  *      @ap: ATA interface
 136  *      @adev: Device being configured
 137  *
 138  */
 139
 140 static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 141 {
 142         static const u32 udma_timings[5] = {
 143                 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
 144         };
 145         static const u32 mwdma_timings[3] = {
 146                 0x7F0FFFF3, 0x7F035352, 0x7F024241
 147         };
 148         u32 reg, dummy;
 149         int mode = adev->dma_mode;
 150
 151         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 152         reg &= 0x80000000UL;
 153         if (mode >= XFER_UDMA_0)
 154                 reg |= udma_timings[mode - XFER_UDMA_0];
 155         else
 156                 reg |= mwdma_timings[mode - XFER_MW_DMA_0];
 157         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
 158 }
 159
 160 static struct scsi_host_template cs5535_sht = {
 161         ATA_BMDMA_SHT(DRV_NAME),
 162 };
 163
 164 static struct ata_port_operations cs5535_port_ops = {
 165         .inherits       = &ata_bmdma_port_ops,
 166         .cable_detect   = cs5535_cable_detect,
 167         .set_piomode    = cs5535_set_piomode,
 168         .set_dmamode    = cs5535_set_dmamode,
 169 };
 170
 171 /**
 172  *      cs5535_init_one         -       Initialise a CS5530
 173  *      @dev: PCI device
 174  *      @id: Entry in match table
 175  *
 176  *      Install a driver for the newly found CS5530 companion chip. Most of
 177  *      this is just housekeeping. We have to set the chip up correctly and
 178  *      turn off various bits of emulation magic.
 179  */
 180
 181 static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 182 {
 183         static const struct ata_port_info info = {
 184                 .flags = ATA_FLAG_SLAVE_POSS,
 185                 .pio_mask = 0x1f,
 186                 .mwdma_mask = 0x07,
 187                 .udma_mask = ATA_UDMA4,
 188                 .port_ops = &cs5535_port_ops
 189         };
 190         const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 191
 192         u32 timings, dummy;
 193
 194         /* Check the BIOS set the initial timing clock. If not set the
 195            timings for PIO0 */
 196         rdmsr(ATAC_CH0D0_PIO, timings, dummy);
 197         if (CS5535_BAD_PIO(timings))
 198                 wrmsr(ATAC_CH0D0_PIO, 0xF7F4F7F4UL, 0);
 199         rdmsr(ATAC_CH0D1_PIO, timings, dummy);
 200         if (CS5535_BAD_PIO(timings))
 201                 wrmsr(ATAC_CH0D1_PIO, 0xF7F4F7F4UL, 0);
 202         return ata_pci_sff_init_one(dev, ppi, &cs5535_sht, NULL);
 203 }
 204
 205 static const struct pci_device_id cs5535[] = {
 206         { PCI_VDEVICE(NS, 0x002D), },
 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);