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_pre_reset(struct ata_link *link, unsigned long deadline)
  36 {
  37         struct ata_port *ap = link->ap;
  38         static const struct pci_bits atiixp_enable_bits[] = {
  39                 { 0x48, 1, 0x01, 0x00 },
  40                 { 0x48, 1, 0x08, 0x00 }
  41         };
  42         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  43
  44         if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
  45                 return -ENOENT;
  46
  47         return ata_sff_prereset(link, deadline);
  48 }
  49
  50 static int atiixp_cable_detect(struct ata_port *ap)
  51 {
  52         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  53         u8 udma;
  54
  55         /* Hack from drivers/ide/pci. Really we want to know how to do the
  56            raw detection not play follow the bios mode guess */
  57         pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
  58         if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
  59                 return  ATA_CBL_PATA80;
  60         return ATA_CBL_PATA40;
  61 }
  62
  63 /**
  64  *      atiixp_set_pio_timing   -       set initial PIO mode data
  65  *      @ap: ATA interface
  66  *      @adev: ATA device
  67  *
  68  *      Called by both the pio and dma setup functions to set the controller
  69  *      timings for PIO transfers. We must load both the mode number and
  70  *      timing values into the controller.
  71  */
  72
  73 static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
  74 {
  75         static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };
  76
  77         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  78         int dn = 2 * ap->port_no + adev->devno;
  79
  80         /* Check this is correct - the order is odd in both drivers */
  81         int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
  82         u16 pio_mode_data, pio_timing_data;
  83
  84         pci_read_config_word(pdev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
  85         pio_mode_data &= ~(0x7 << (4 * dn));
  86         pio_mode_data |= pio << (4 * dn);
  87         pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
  88
  89         pci_read_config_word(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
  90         pio_timing_data &= ~(0xFF << timing_shift);
  91         pio_timing_data |= (pio_timings[pio] << timing_shift);
  92         pci_write_config_word(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
  93 }
  94
  95 /**
  96  *      atiixp_set_piomode      -       set initial PIO mode data
  97  *      @ap: ATA interface
  98  *      @adev: ATA device
  99  *
 100  *      Called to do the PIO mode setup. We use a shared helper for this
 101  *      as the DMA setup must also adjust the PIO timing information.
 102  */
 103
 104 static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
 105 {
 106         atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
 107 }
 108
 109 /**
 110  *      atiixp_set_dmamode      -       set initial DMA mode data
 111  *      @ap: ATA interface
 112  *      @adev: ATA device
 113  *
 114  *      Called to do the DMA mode setup. We use timing tables for most
 115  *      modes but must tune an appropriate PIO mode to match.
 116  */
 117
 118 static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 119 {
 120         static u8 mwdma_timings[5] = { 0x77, 0x21, 0x20 };
 121
 122         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 123         int dma = adev->dma_mode;
 124         int dn = 2 * ap->port_no + adev->devno;
 125         int wanted_pio;
 126
 127         if (adev->dma_mode >= XFER_UDMA_0) {
 128                 u16 udma_mode_data;
 129
 130                 dma -= XFER_UDMA_0;
 131
 132                 pci_read_config_word(pdev, ATIIXP_IDE_UDMA_MODE, &udma_mode_data);
 133                 udma_mode_data &= ~(0x7 << (4 * dn));
 134                 udma_mode_data |= dma << (4 * dn);
 135                 pci_write_config_word(pdev, ATIIXP_IDE_UDMA_MODE, udma_mode_data);
 136         } else {
 137                 u16 mwdma_timing_data;
 138                 /* Check this is correct - the order is odd in both drivers */
 139                 int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
 140
 141                 dma -= XFER_MW_DMA_0;
 142
 143                 pci_read_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, &mwdma_timing_data);
 144                 mwdma_timing_data &= ~(0xFF << timing_shift);
 145                 mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
 146                 pci_write_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, mwdma_timing_data);
 147         }
 148         /*
 149          *      We must now look at the PIO mode situation. We may need to
 150          *      adjust the PIO mode to keep the timings acceptable
 151          */
 152          if (adev->dma_mode >= XFER_MW_DMA_2)
 153                 wanted_pio = 4;
 154         else if (adev->dma_mode == XFER_MW_DMA_1)
 155                 wanted_pio = 3;
 156         else if (adev->dma_mode == XFER_MW_DMA_0)
 157                 wanted_pio = 0;
 158         else BUG();
 159
 160         if (adev->pio_mode != wanted_pio)
 161                 atiixp_set_pio_timing(ap, adev, wanted_pio);
 162 }
 163
 164 /**
 165  *      atiixp_bmdma_start      -       DMA start callback
 166  *      @qc: Command in progress
 167  *
 168  *      When DMA begins we need to ensure that the UDMA control
 169  *      register for the channel is correctly set.
 170  *
 171  *      Note: The host lock held by the libata layer protects
 172  *      us from two channels both trying to set DMA bits at once
 173  */
 174
 175 static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
 176 {
 177         struct ata_port *ap = qc->ap;
 178         struct ata_device *adev = qc->dev;
 179
 180         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 181         int dn = (2 * ap->port_no) + adev->devno;
 182         u16 tmp16;
 183
 184         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 185         if (ata_using_udma(adev))
 186                 tmp16 |= (1 << dn);
 187         else
 188                 tmp16 &= ~(1 << dn);
 189         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 190         ata_bmdma_start(qc);
 191 }
 192
 193 /**
 194  *      atiixp_dma_stop -       DMA stop callback
 195  *      @qc: Command in progress
 196  *
 197  *      DMA has completed. Clear the UDMA flag as the next operations will
 198  *      be PIO ones not UDMA data transfer.
 199  *
 200  *      Note: The host lock held by the libata layer protects
 201  *      us from two channels both trying to set DMA bits at once
 202  */
 203
 204 static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
 205 {
 206         struct ata_port *ap = qc->ap;
 207         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 208         int dn = (2 * ap->port_no) + qc->dev->devno;
 209         u16 tmp16;
 210
 211         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 212         tmp16 &= ~(1 << dn);
 213         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 214         ata_bmdma_stop(qc);
 215 }
 216
 217 static struct scsi_host_template atiixp_sht = {
 218         ATA_BMDMA_SHT(DRV_NAME),
 219         .sg_tablesize           = LIBATA_DUMB_MAX_PRD,
 220 };
 221
 222 static struct ata_port_operations atiixp_port_ops = {
 223         .inherits       = &ata_bmdma_port_ops,
 224
 225         .qc_prep        = ata_sff_dumb_qc_prep,
 226         .bmdma_start    = atiixp_bmdma_start,
 227         .bmdma_stop     = atiixp_bmdma_stop,
 228
 229         .cable_detect   = atiixp_cable_detect,
 230         .set_piomode    = atiixp_set_piomode,
 231         .set_dmamode    = atiixp_set_dmamode,
 232         .prereset       = atiixp_pre_reset,
 233 };
 234
 235 static int atiixp_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 236 {
 237         static const struct ata_port_info info = {
 238                 .flags = ATA_FLAG_SLAVE_POSS,
 239                 .pio_mask = 0x1f,
 240                 .mwdma_mask = 0x06,     /* No MWDMA0 support */
 241                 .udma_mask = 0x3F,
 242                 .port_ops = &atiixp_port_ops
 243         };
 244         const struct ata_port_info *ppi[] = { &info, NULL };
 245         return ata_pci_sff_init_one(dev, ppi, &atiixp_sht, NULL);
 246 }
 247
 248 static const struct pci_device_id atiixp[] = {
 249         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
 250         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
 251         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
 252         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
 253         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },
 254
 255         { },
 256 };
 257
 258 static struct pci_driver atiixp_pci_driver = {
 259         .name           = DRV_NAME,
 260         .id_table       = atiixp,
 261         .probe          = atiixp_init_one,
 262         .remove         = ata_pci_remove_one,
 263 #ifdef CONFIG_PM
 264         .resume         = ata_pci_device_resume,
 265         .suspend        = ata_pci_device_suspend,
 266 #endif
 267 };
 268
 269 static int __init atiixp_init(void)
 270 {
 271         return pci_register_driver(&atiixp_pci_driver);
 272 }
 273
 274
 275 static void __exit atiixp_exit(void)
 276 {
 277         pci_unregister_driver(&atiixp_pci_driver);
 278 }
 279
 280 MODULE_AUTHOR("Alan Cox");
 281 MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
 282 MODULE_LICENSE("GPL");
 283 MODULE_DEVICE_TABLE(pci, atiixp);
 284 MODULE_VERSION(DRV_VERSION);
 285
 286 module_init(atiixp_init);
 287 module_exit(atiixp_exit);