kernel/2.6.29.6-aldebaran-rt/drivers/ata/pata_atiixp.c

   1 /*
   2  * pata_atiixp.c        - ATI PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *
   5  * Based on
   6  *
   7  *  linux/drivers/ide/pci/atiixp.c      Version 0.01-bart2      Feb. 26, 2004
   8  *
   9  *  Copyright (C) 2003 ATI Inc. <hyu@ati.com>
  10  *  Copyright (C) 2004 Bartlomiej Zolnierkiewicz
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/init.h>
  18 #include <linux/blkdev.h>
  19 #include <linux/delay.h>
  20 #include <scsi/scsi_host.h>
  21 #include <linux/libata.h>
  22
  23 #define DRV_NAME "pata_atiixp"
  24 #define DRV_VERSION "0.4.6"
  25
  26 enum {
  27         ATIIXP_IDE_PIO_TIMING   = 0x40,
  28         ATIIXP_IDE_MWDMA_TIMING = 0x44,
  29         ATIIXP_IDE_PIO_CONTROL  = 0x48,
  30         ATIIXP_IDE_PIO_MODE     = 0x4a,
  31         ATIIXP_IDE_UDMA_CONTROL = 0x54,
  32         ATIIXP_IDE_UDMA_MODE    = 0x56
  33 };
  34
  35 static int atiixp_cable_detect(struct ata_port *ap)
  36 {
  37         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  38         u8 udma;
  39
  40         /* Hack from drivers/ide/pci. Really we want to know how to do the
  41            raw detection not play follow the bios mode guess */
  42         pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
  43         if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
  44                 return  ATA_CBL_PATA80;
  45         return ATA_CBL_PATA40;
  46 }
  47
  48 /**
  49  *      atiixp_set_pio_timing   -       set initial PIO mode data
  50  *      @ap: ATA interface
  51  *      @adev: ATA device
  52  *
  53  *      Called by both the pio and dma setup functions to set the controller
  54  *      timings for PIO transfers. We must load both the mode number and
  55  *      timing values into the controller.
  56  */
  57
  58 static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
  59 {
  60         static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };
  61
  62         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  63         int dn = 2 * ap->port_no + adev->devno;
  64
  65         /* Check this is correct - the order is odd in both drivers */
  66         int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
  67         u16 pio_mode_data, pio_timing_data;
  68
  69         pci_read_config_word(pdev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
  70         pio_mode_data &= ~(0x7 << (4 * dn));
  71         pio_mode_data |= pio << (4 * dn);
  72         pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
  73
  74         pci_read_config_word(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
  75         pio_timing_data &= ~(0xFF << timing_shift);
  76         pio_timing_data |= (pio_timings[pio] << timing_shift);
  77         pci_write_config_word(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
  78 }
  79
  80 /**
  81  *      atiixp_set_piomode      -       set initial PIO mode data
  82  *      @ap: ATA interface
  83  *      @adev: ATA device
  84  *
  85  *      Called to do the PIO mode setup. We use a shared helper for this
  86  *      as the DMA setup must also adjust the PIO timing information.
  87  */
  88
  89 static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
  90 {
  91         atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
  92 }
  93
  94 /**
  95  *      atiixp_set_dmamode      -       set initial DMA mode data
  96  *      @ap: ATA interface
  97  *      @adev: ATA device
  98  *
  99  *      Called to do the DMA mode setup. We use timing tables for most
 100  *      modes but must tune an appropriate PIO mode to match.
 101  */
 102
 103 static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 104 {
 105         static u8 mwdma_timings[5] = { 0x77, 0x21, 0x20 };
 106
 107         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 108         int dma = adev->dma_mode;
 109         int dn = 2 * ap->port_no + adev->devno;
 110         int wanted_pio;
 111
 112         if (adev->dma_mode >= XFER_UDMA_0) {
 113                 u16 udma_mode_data;
 114
 115                 dma -= XFER_UDMA_0;
 116
 117                 pci_read_config_word(pdev, ATIIXP_IDE_UDMA_MODE, &udma_mode_data);
 118                 udma_mode_data &= ~(0x7 << (4 * dn));
 119                 udma_mode_data |= dma << (4 * dn);
 120                 pci_write_config_word(pdev, ATIIXP_IDE_UDMA_MODE, udma_mode_data);
 121         } else {
 122                 u16 mwdma_timing_data;
 123                 /* Check this is correct - the order is odd in both drivers */
 124                 int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
 125
 126                 dma -= XFER_MW_DMA_0;
 127
 128                 pci_read_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, &mwdma_timing_data);
 129                 mwdma_timing_data &= ~(0xFF << timing_shift);
 130                 mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
 131                 pci_write_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, mwdma_timing_data);
 132         }
 133         /*
 134          *      We must now look at the PIO mode situation. We may need to
 135          *      adjust the PIO mode to keep the timings acceptable
 136          */
 137          if (adev->dma_mode >= XFER_MW_DMA_2)
 138                 wanted_pio = 4;
 139         else if (adev->dma_mode == XFER_MW_DMA_1)
 140                 wanted_pio = 3;
 141         else if (adev->dma_mode == XFER_MW_DMA_0)
 142                 wanted_pio = 0;
 143         else panic("atiixp_set_dmamode: unknown DMA mode!");
 144
 145         if (adev->pio_mode != wanted_pio)
 146                 atiixp_set_pio_timing(ap, adev, wanted_pio);
 147 }
 148
 149 /**
 150  *      atiixp_bmdma_start      -       DMA start callback
 151  *      @qc: Command in progress
 152  *
 153  *      When DMA begins we need to ensure that the UDMA control
 154  *      register for the channel is correctly set.
 155  *
 156  *      Note: The host lock held by the libata layer protects
 157  *      us from two channels both trying to set DMA bits at once
 158  */
 159
 160 static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
 161 {
 162         struct ata_port *ap = qc->ap;
 163         struct ata_device *adev = qc->dev;
 164
 165         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 166         int dn = (2 * ap->port_no) + adev->devno;
 167         u16 tmp16;
 168
 169         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 170         if (ata_using_udma(adev))
 171                 tmp16 |= (1 << dn);
 172         else
 173                 tmp16 &= ~(1 << dn);
 174         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 175         ata_bmdma_start(qc);
 176 }
 177
 178 /**
 179  *      atiixp_dma_stop -       DMA stop callback
 180  *      @qc: Command in progress
 181  *
 182  *      DMA has completed. Clear the UDMA flag as the next operations will
 183  *      be PIO ones not UDMA data transfer.
 184  *
 185  *      Note: The host lock held by the libata layer protects
 186  *      us from two channels both trying to set DMA bits at once
 187  */
 188
 189 static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
 190 {
 191         struct ata_port *ap = qc->ap;
 192         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 193         int dn = (2 * ap->port_no) + qc->dev->devno;
 194         u16 tmp16;
 195
 196         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 197         tmp16 &= ~(1 << dn);
 198         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 199         ata_bmdma_stop(qc);
 200 }
 201
 202 static struct scsi_host_template atiixp_sht = {
 203         ATA_BMDMA_SHT(DRV_NAME),
 204         .sg_tablesize           = LIBATA_DUMB_MAX_PRD,
 205 };
 206
 207 static struct ata_port_operations atiixp_port_ops = {
 208         .inherits       = &ata_bmdma_port_ops,
 209
 210         .qc_prep        = ata_sff_dumb_qc_prep,
 211         .bmdma_start    = atiixp_bmdma_start,
 212         .bmdma_stop     = atiixp_bmdma_stop,
 213
 214         .cable_detect   = atiixp_cable_detect,
 215         .set_piomode    = atiixp_set_piomode,
 216         .set_dmamode    = atiixp_set_dmamode,
 217 };
 218
 219 static int atiixp_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 220 {
 221         static const struct ata_port_info info = {
 222                 .flags = ATA_FLAG_SLAVE_POSS,
 223                 .pio_mask = 0x1f,
 224                 .mwdma_mask = 0x06,     /* No MWDMA0 support */
 225                 .udma_mask = 0x3F,
 226                 .port_ops = &atiixp_port_ops
 227         };
 228         static const struct pci_bits atiixp_enable_bits[] = {
 229                 { 0x48, 1, 0x01, 0x00 },
 230                 { 0x48, 1, 0x08, 0x00 }
 231         };
 232         const struct ata_port_info *ppi[] = { &info, &info };
 233         int i;
 234
 235         for (i = 0; i < 2; i++)
 236                 if (!pci_test_config_bits(pdev, &atiixp_enable_bits[i]))
 237                         ppi[i] = &ata_dummy_port_info;
 238
 239         return ata_pci_sff_init_one(pdev, ppi, &atiixp_sht, NULL);
 240 }
 241
 242 static const struct pci_device_id atiixp[] = {
 243         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
 244         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
 245         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
 246         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
 247         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },
 248
 249         { },
 250 };
 251
 252 static struct pci_driver atiixp_pci_driver = {
 253         .name           = DRV_NAME,
 254         .id_table       = atiixp,
 255         .probe          = atiixp_init_one,
 256         .remove         = ata_pci_remove_one,
 257 #ifdef CONFIG_PM
 258         .resume         = ata_pci_device_resume,
 259         .suspend        = ata_pci_device_suspend,
 260 #endif
 261 };
 262
 263 static int __init atiixp_init(void)
 264 {
 265         return pci_register_driver(&atiixp_pci_driver);
 266 }
 267
 268
 269 static void __exit atiixp_exit(void)
 270 {
 271         pci_unregister_driver(&atiixp_pci_driver);
 272 }
 273
 274 MODULE_AUTHOR("Alan Cox");
 275 MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
 276 MODULE_LICENSE("GPL");
 277 MODULE_DEVICE_TABLE(pci, atiixp);
 278 MODULE_VERSION(DRV_VERSION);
 279
 280 module_init(atiixp_init);
 281 module_exit(atiixp_exit);