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 neccessary
  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     "0.2.10"
  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_pre_reset        -       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_pre_reset(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                 ap->cbl = ATA_CBL_PATA80;
  88         else
  89                 ap->cbl = ATA_CBL_PATA40;
  90         return ata_std_prereset(ap);
  91 }
  92
  93 /**
  94  *      cs5535_error_handler            -       reset/probe
  95  *      @ap: Port to reset
  96  *
  97  *      Reset and configure a port
  98  */
  99
 100 static void cs5535_error_handler(struct ata_port *ap)
 101 {
 102         ata_bmdma_drive_eh(ap, cs5535_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 103 }
 104
 105 /**
 106  *      cs5535_set_piomode              -       PIO setup
 107  *      @ap: ATA interface
 108  *      @adev: device on the interface
 109  *
 110  *      Set our PIO requirements. The CS5535 is pretty clean about all this
 111  */
 112
 113 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
 114 {
 115         static const u16 pio_timings[5] = {
 116                 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 117         };
 118         static const u16 pio_cmd_timings[5] = {
 119                 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
 120         };
 121         u32 reg, dummy;
 122         struct ata_device *pair = ata_dev_pair(adev);
 123
 124         int mode = adev->pio_mode - XFER_PIO_0;
 125         int cmdmode = mode;
 126
 127         /* Command timing has to be for the lowest of the pair of devices */
 128         if (pair) {
 129                 int pairmode = pair->pio_mode - XFER_PIO_0;
 130                 cmdmode = min(mode, pairmode);
 131                 /* Write the other drive timing register if it changed */
 132                 if (cmdmode < pairmode)
 133                         wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
 134                                 pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
 135         }
 136         /* Write the drive timing register */
 137         wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
 138                 pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
 139
 140         /* Set the PIO "format 1" bit in the DMA timing register */
 141         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 142         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
 143 }
 144
 145 /**
 146  *      cs5535_set_dmamode              -       DMA timing setup
 147  *      @ap: ATA interface
 148  *      @adev: Device being configured
 149  *
 150  */
 151
 152 static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 153 {
 154         static const u32 udma_timings[5] = {
 155                 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
 156         };
 157         static const u32 mwdma_timings[3] = {
 158                 0x7F0FFFF3, 0x7F035352, 0x7F024241
 159         };
 160         u32 reg, dummy;
 161         int mode = adev->dma_mode;
 162
 163         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
 164         reg &= 0x80000000UL;
 165         if (mode >= XFER_UDMA_0)
 166                 reg |= udma_timings[mode - XFER_UDMA_0];
 167         else
 168                 reg |= mwdma_timings[mode - XFER_MW_DMA_0];
 169         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
 170 }
 171
 172 static struct scsi_host_template cs5535_sht = {
 173         .module                 = THIS_MODULE,
 174         .name                   = DRV_NAME,
 175         .ioctl                  = ata_scsi_ioctl,
 176         .queuecommand           = ata_scsi_queuecmd,
 177         .can_queue              = ATA_DEF_QUEUE,
 178         .this_id                = ATA_SHT_THIS_ID,
 179         .sg_tablesize           = LIBATA_MAX_PRD,
 180         .max_sectors            = ATA_MAX_SECTORS,
 181         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 182         .emulated               = ATA_SHT_EMULATED,
 183         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 184         .proc_name              = DRV_NAME,
 185         .dma_boundary           = ATA_DMA_BOUNDARY,
 186         .slave_configure        = ata_scsi_slave_config,
 187         .slave_destroy          = ata_scsi_slave_destroy,
 188         .bios_param             = ata_std_bios_param,
 189 };
 190
 191 static struct ata_port_operations cs5535_port_ops = {
 192         .port_disable   = ata_port_disable,
 193         .set_piomode    = cs5535_set_piomode,
 194         .set_dmamode    = cs5535_set_dmamode,
 195         .mode_filter    = ata_pci_default_filter,
 196
 197         .tf_load        = ata_tf_load,
 198         .tf_read        = ata_tf_read,
 199         .check_status   = ata_check_status,
 200         .exec_command   = ata_exec_command,
 201         .dev_select     = ata_std_dev_select,
 202
 203         .freeze         = ata_bmdma_freeze,
 204         .thaw           = ata_bmdma_thaw,
 205         .error_handler  = cs5535_error_handler,
 206         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 207
 208         .bmdma_setup    = ata_bmdma_setup,
 209         .bmdma_start    = ata_bmdma_start,
 210         .bmdma_stop     = ata_bmdma_stop,
 211         .bmdma_status   = ata_bmdma_status,
 212
 213         .qc_prep        = ata_qc_prep,
 214         .qc_issue       = ata_qc_issue_prot,
 215
 216         .data_xfer      = ata_pio_data_xfer,
 217
 218         .irq_handler    = ata_interrupt,
 219         .irq_clear      = ata_bmdma_irq_clear,
 220
 221         .port_start     = ata_port_start,
 222         .port_stop      = ata_port_stop,
 223         .host_stop      = ata_host_stop
 224 };
 225
 226 /**
 227  *      cs5535_init_one         -       Initialise a CS5530
 228  *      @dev: PCI device
 229  *      @id: Entry in match table
 230  *
 231  *      Install a driver for the newly found CS5530 companion chip. Most of
 232  *      this is just housekeeping. We have to set the chip up correctly and
 233  *      turn off various bits of emulation magic.
 234  */
 235
 236 static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 237 {
 238         static struct ata_port_info info = {
 239                 .sht = &cs5535_sht,
 240                 .flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
 241                 .pio_mask = 0x1f,
 242                 .mwdma_mask = 0x07,
 243                 .udma_mask = 0x1f,
 244                 .port_ops = &cs5535_port_ops
 245         };
 246         struct ata_port_info *ports[1] = { &info };
 247
 248         u32 timings, dummy;
 249
 250         /* Check the BIOS set the initial timing clock. If not set the
 251            timings for PIO0 */
 252         rdmsr(ATAC_CH0D0_PIO, timings, dummy);
 253         if (CS5535_BAD_PIO(timings))
 254                 wrmsr(ATAC_CH0D0_PIO, 0xF7F4F7F4UL, 0);
 255         rdmsr(ATAC_CH0D1_PIO, timings, dummy);
 256         if (CS5535_BAD_PIO(timings))
 257                 wrmsr(ATAC_CH0D1_PIO, 0xF7F4F7F4UL, 0);
 258         return ata_pci_init_one(dev, ports, 1);
 259 }
 260
 261 static const struct pci_device_id cs5535[] = {
 262         { PCI_VDEVICE(NS, 0x002D), },
 263
 264         { },
 265 };
 266
 267 static struct pci_driver cs5535_pci_driver = {
 268         .name           = DRV_NAME,
 269         .id_table       = cs5535,
 270         .probe          = cs5535_init_one,
 271         .remove         = ata_pci_remove_one
 272 };
 273
 274 static int __init cs5535_init(void)
 275 {
 276         return pci_register_driver(&cs5535_pci_driver);
 277 }
 278
 279 static void __exit cs5535_exit(void)
 280 {
 281         pci_unregister_driver(&cs5535_pci_driver);
 282 }
 283
 284 MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
 285 MODULE_DESCRIPTION("low-level driver for the NS/AMD 5530");
 286 MODULE_LICENSE("GPL");
 287 MODULE_DEVICE_TABLE(pci, cs5535);
 288 MODULE_VERSION(DRV_VERSION);
 289
 290 module_init(cs5535_init);
 291 module_exit(cs5535_exit);