drivers/ata/pata_atiixp.c

   1 /*
   2  * pata_atiixp.c        - ATI PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        Alan Cox <alan@redhat.com>
   5  *
   6  * Based on
   7  *
   8  *  linux/drivers/ide/pci/atiixp.c      Version 0.01-bart2      Feb. 26, 2004
   9  *
  10  *  Copyright (C) 2003 ATI Inc. <hyu@ati.com>
  11  *  Copyright (C) 2004 Bartlomiej Zolnierkiewicz
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/init.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/delay.h>
  21 #include <scsi/scsi_host.h>
  22 #include <linux/libata.h>
  23
  24 #define DRV_NAME "pata_atiixp"
  25 #define DRV_VERSION "0.4.6"
  26
  27 enum {
  28         ATIIXP_IDE_PIO_TIMING   = 0x40,
  29         ATIIXP_IDE_MWDMA_TIMING = 0x44,
  30         ATIIXP_IDE_PIO_CONTROL  = 0x48,
  31         ATIIXP_IDE_PIO_MODE     = 0x4a,
  32         ATIIXP_IDE_UDMA_CONTROL = 0x54,
  33         ATIIXP_IDE_UDMA_MODE    = 0x56
  34 };
  35
  36 static int atiixp_pre_reset(struct ata_link *link, unsigned long deadline)
  37 {
  38         struct ata_port *ap = link->ap;
  39         static const struct pci_bits atiixp_enable_bits[] = {
  40                 { 0x48, 1, 0x01, 0x00 },
  41                 { 0x48, 1, 0x08, 0x00 }
  42         };
  43         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  44
  45         if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
  46                 return -ENOENT;
  47
  48         return ata_sff_prereset(link, deadline);
  49 }
  50
  51 static int atiixp_cable_detect(struct ata_port *ap)
  52 {
  53         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  54         u8 udma;
  55
  56         /* Hack from drivers/ide/pci. Really we want to know how to do the
  57            raw detection not play follow the bios mode guess */
  58         pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
  59         if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
  60                 return  ATA_CBL_PATA80;
  61         return ATA_CBL_PATA40;
  62 }
  63
  64 /**
  65  *      atiixp_set_pio_timing   -       set initial PIO mode data
  66  *      @ap: ATA interface
  67  *      @adev: ATA device
  68  *
  69  *      Called by both the pio and dma setup functions to set the controller
  70  *      timings for PIO transfers. We must load both the mode number and
  71  *      timing values into the controller.
  72  */
  73
  74 static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
  75 {
  76         static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };
  77
  78         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  79         int dn = 2 * ap->port_no + adev->devno;
  80
  81         /* Check this is correct - the order is odd in both drivers */
  82         int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
  83         u16 pio_mode_data, pio_timing_data;
  84
  85         pci_read_config_word(pdev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
  86         pio_mode_data &= ~(0x7 << (4 * dn));
  87         pio_mode_data |= pio << (4 * dn);
  88         pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
  89
  90         pci_read_config_word(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
  91         pio_timing_data &= ~(0xFF << timing_shift);
  92         pio_timing_data |= (pio_timings[pio] << timing_shift);
  93         pci_write_config_word(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
  94 }
  95
  96 /**
  97  *      atiixp_set_piomode      -       set initial PIO mode data
  98  *      @ap: ATA interface
  99  *      @adev: ATA device
 100  *
 101  *      Called to do the PIO mode setup. We use a shared helper for this
 102  *      as the DMA setup must also adjust the PIO timing information.
 103  */
 104
 105 static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
 106 {
 107         atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
 108 }
 109
 110 /**
 111  *      atiixp_set_dmamode      -       set initial DMA mode data
 112  *      @ap: ATA interface
 113  *      @adev: ATA device
 114  *
 115  *      Called to do the DMA mode setup. We use timing tables for most
 116  *      modes but must tune an appropriate PIO mode to match.
 117  */
 118
 119 static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 120 {
 121         static u8 mwdma_timings[5] = { 0x77, 0x21, 0x20 };
 122
 123         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 124         int dma = adev->dma_mode;
 125         int dn = 2 * ap->port_no + adev->devno;
 126         int wanted_pio;
 127
 128         if (adev->dma_mode >= XFER_UDMA_0) {
 129                 u16 udma_mode_data;
 130
 131                 dma -= XFER_UDMA_0;
 132
 133                 pci_read_config_word(pdev, ATIIXP_IDE_UDMA_MODE, &udma_mode_data);
 134                 udma_mode_data &= ~(0x7 << (4 * dn));
 135                 udma_mode_data |= dma << (4 * dn);
 136                 pci_write_config_word(pdev, ATIIXP_IDE_UDMA_MODE, udma_mode_data);
 137         } else {
 138                 u16 mwdma_timing_data;
 139                 /* Check this is correct - the order is odd in both drivers */
 140                 int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
 141
 142                 dma -= XFER_MW_DMA_0;
 143
 144                 pci_read_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, &mwdma_timing_data);
 145                 mwdma_timing_data &= ~(0xFF << timing_shift);
 146                 mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
 147                 pci_write_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, mwdma_timing_data);
 148         }
 149         /*
 150          *      We must now look at the PIO mode situation. We may need to
 151          *      adjust the PIO mode to keep the timings acceptable
 152          */
 153          if (adev->dma_mode >= XFER_MW_DMA_2)
 154                 wanted_pio = 4;
 155         else if (adev->dma_mode == XFER_MW_DMA_1)
 156                 wanted_pio = 3;
 157         else if (adev->dma_mode == XFER_MW_DMA_0)
 158                 wanted_pio = 0;
 159         else BUG();
 160
 161         if (adev->pio_mode != wanted_pio)
 162                 atiixp_set_pio_timing(ap, adev, wanted_pio);
 163 }
 164
 165 /**
 166  *      atiixp_bmdma_start      -       DMA start callback
 167  *      @qc: Command in progress
 168  *
 169  *      When DMA begins we need to ensure that the UDMA control
 170  *      register for the channel is correctly set.
 171  *
 172  *      Note: The host lock held by the libata layer protects
 173  *      us from two channels both trying to set DMA bits at once
 174  */
 175
 176 static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
 177 {
 178         struct ata_port *ap = qc->ap;
 179         struct ata_device *adev = qc->dev;
 180
 181         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 182         int dn = (2 * ap->port_no) + adev->devno;
 183         u16 tmp16;
 184
 185         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 186         if (ata_using_udma(adev))
 187                 tmp16 |= (1 << dn);
 188         else
 189                 tmp16 &= ~(1 << dn);
 190         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 191         ata_bmdma_start(qc);
 192 }
 193
 194 /**
 195  *      atiixp_dma_stop -       DMA stop callback
 196  *      @qc: Command in progress
 197  *
 198  *      DMA has completed. Clear the UDMA flag as the next operations will
 199  *      be PIO ones not UDMA data transfer.
 200  *
 201  *      Note: The host lock held by the libata layer protects
 202  *      us from two channels both trying to set DMA bits at once
 203  */
 204
 205 static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
 206 {
 207         struct ata_port *ap = qc->ap;
 208         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 209         int dn = (2 * ap->port_no) + qc->dev->devno;
 210         u16 tmp16;
 211
 212         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 213         tmp16 &= ~(1 << dn);
 214         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 215         ata_bmdma_stop(qc);
 216 }
 217
 218 static struct scsi_host_template atiixp_sht = {
 219         ATA_BMDMA_SHT(DRV_NAME),
 220         .sg_tablesize           = LIBATA_DUMB_MAX_PRD,
 221 };
 222
 223 static struct ata_port_operations atiixp_port_ops = {
 224         .inherits       = &ata_bmdma_port_ops,
 225
 226         .qc_prep        = ata_sff_dumb_qc_prep,
 227         .bmdma_start    = atiixp_bmdma_start,
 228         .bmdma_stop     = atiixp_bmdma_stop,
 229
 230         .cable_detect   = atiixp_cable_detect,
 231         .set_piomode    = atiixp_set_piomode,
 232         .set_dmamode    = atiixp_set_dmamode,
 233         .prereset       = atiixp_pre_reset,
 234 };
 235
 236 static int atiixp_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 237 {
 238         static const struct ata_port_info info = {
 239                 .flags = ATA_FLAG_SLAVE_POSS,
 240                 .pio_mask = 0x1f,
 241                 .mwdma_mask = 0x06,     /* No MWDMA0 support */
 242                 .udma_mask = 0x3F,
 243                 .port_ops = &atiixp_port_ops
 244         };
 245         const struct ata_port_info *ppi[] = { &info, NULL };
 246         return ata_pci_sff_init_one(dev, ppi, &atiixp_sht, NULL);
 247 }
 248
 249 static const struct pci_device_id atiixp[] = {
 250         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
 251         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
 252         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
 253         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
 254         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },
 255
 256         { },
 257 };
 258
 259 static struct pci_driver atiixp_pci_driver = {
 260         .name           = DRV_NAME,
 261         .id_table       = atiixp,
 262         .probe          = atiixp_init_one,
 263         .remove         = ata_pci_remove_one,
 264 #ifdef CONFIG_PM
 265         .resume         = ata_pci_device_resume,
 266         .suspend        = ata_pci_device_suspend,
 267 #endif
 268 };
 269
 270 static int __init atiixp_init(void)
 271 {
 272         return pci_register_driver(&atiixp_pci_driver);
 273 }
 274
 275
 276 static void __exit atiixp_exit(void)
 277 {
 278         pci_unregister_driver(&atiixp_pci_driver);
 279 }
 280
 281 MODULE_AUTHOR("Alan Cox");
 282 MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
 283 MODULE_LICENSE("GPL");
 284 MODULE_DEVICE_TABLE(pci, atiixp);
 285 MODULE_VERSION(DRV_VERSION);
 286
 287 module_init(atiixp_init);
 288 module_exit(atiixp_exit);