drivers/ata/pata_atiixp.c

   1 /*
   2  * pata_atiixp.c        - ATI PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        (C) 2009 Bartlomiej Zolnierkiewicz
   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_cable_detect(struct ata_port *ap)
  37 {
  38         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  39         u8 udma;
  40
  41         /* Hack from drivers/ide/pci. Really we want to know how to do the
  42            raw detection not play follow the bios mode guess */
  43         pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
  44         if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
  45                 return  ATA_CBL_PATA80;
  46         return ATA_CBL_PATA40;
  47 }
  48
  49 /**
  50  *      atiixp_set_pio_timing   -       set initial PIO mode data
  51  *      @ap: ATA interface
  52  *      @adev: ATA device
  53  *
  54  *      Called by both the pio and dma setup functions to set the controller
  55  *      timings for PIO transfers. We must load both the mode number and
  56  *      timing values into the controller.
  57  */
  58
  59 static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
  60 {
  61         static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };
  62
  63         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  64         int dn = 2 * ap->port_no + adev->devno;
  65         int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
  66         u32 pio_timing_data;
  67         u16 pio_mode_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_dword(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_dword(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                 int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
 123                 u32 mwdma_timing_data;
 124
 125                 dma -= XFER_MW_DMA_0;
 126
 127                 pci_read_config_dword(pdev, ATIIXP_IDE_MWDMA_TIMING,
 128                                       &mwdma_timing_data);
 129                 mwdma_timing_data &= ~(0xFF << timing_shift);
 130                 mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
 131                 pci_write_config_dword(pdev, ATIIXP_IDE_MWDMA_TIMING,
 132                                        mwdma_timing_data);
 133         }
 134         /*
 135          *      We must now look at the PIO mode situation. We may need to
 136          *      adjust the PIO mode to keep the timings acceptable
 137          */
 138          if (adev->dma_mode >= XFER_MW_DMA_2)
 139                 wanted_pio = 4;
 140         else if (adev->dma_mode == XFER_MW_DMA_1)
 141                 wanted_pio = 3;
 142         else if (adev->dma_mode == XFER_MW_DMA_0)
 143                 wanted_pio = 0;
 144         else BUG();
 145
 146         if (adev->pio_mode != wanted_pio)
 147                 atiixp_set_pio_timing(ap, adev, wanted_pio);
 148 }
 149
 150 /**
 151  *      atiixp_bmdma_start      -       DMA start callback
 152  *      @qc: Command in progress
 153  *
 154  *      When DMA begins we need to ensure that the UDMA control
 155  *      register for the channel is correctly set.
 156  *
 157  *      Note: The host lock held by the libata layer protects
 158  *      us from two channels both trying to set DMA bits at once
 159  */
 160
 161 static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
 162 {
 163         struct ata_port *ap = qc->ap;
 164         struct ata_device *adev = qc->dev;
 165
 166         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 167         int dn = (2 * ap->port_no) + adev->devno;
 168         u16 tmp16;
 169
 170         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 171         if (ata_using_udma(adev))
 172                 tmp16 |= (1 << dn);
 173         else
 174                 tmp16 &= ~(1 << dn);
 175         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 176         ata_bmdma_start(qc);
 177 }
 178
 179 /**
 180  *      atiixp_dma_stop -       DMA stop callback
 181  *      @qc: Command in progress
 182  *
 183  *      DMA has completed. Clear the UDMA flag as the next operations will
 184  *      be PIO ones not UDMA data transfer.
 185  *
 186  *      Note: The host lock held by the libata layer protects
 187  *      us from two channels both trying to set DMA bits at once
 188  */
 189
 190 static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
 191 {
 192         struct ata_port *ap = qc->ap;
 193         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 194         int dn = (2 * ap->port_no) + qc->dev->devno;
 195         u16 tmp16;
 196
 197         pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
 198         tmp16 &= ~(1 << dn);
 199         pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
 200         ata_bmdma_stop(qc);
 201 }
 202
 203 static struct scsi_host_template atiixp_sht = {
 204         ATA_BMDMA_SHT(DRV_NAME),
 205         .sg_tablesize           = LIBATA_DUMB_MAX_PRD,
 206 };
 207
 208 static struct ata_port_operations atiixp_port_ops = {
 209         .inherits       = &ata_bmdma_port_ops,
 210
 211         .qc_prep        = ata_sff_dumb_qc_prep,
 212         .bmdma_start    = atiixp_bmdma_start,
 213         .bmdma_stop     = atiixp_bmdma_stop,
 214
 215         .cable_detect   = atiixp_cable_detect,
 216         .set_piomode    = atiixp_set_piomode,
 217         .set_dmamode    = atiixp_set_dmamode,
 218 };
 219
 220 static int atiixp_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 221 {
 222         static const struct ata_port_info info = {
 223                 .flags = ATA_FLAG_SLAVE_POSS,
 224                 .pio_mask = ATA_PIO4,
 225                 .mwdma_mask = ATA_MWDMA12_ONLY,
 226                 .udma_mask = ATA_UDMA5,
 227                 .port_ops = &atiixp_port_ops
 228         };
 229         static const struct pci_bits atiixp_enable_bits[] = {
 230                 { 0x48, 1, 0x01, 0x00 },
 231                 { 0x48, 1, 0x08, 0x00 }
 232         };
 233         const struct ata_port_info *ppi[] = { &info, &info };
 234         int i;
 235
 236         for (i = 0; i < 2; i++)
 237                 if (!pci_test_config_bits(pdev, &atiixp_enable_bits[i]))
 238                         ppi[i] = &ata_dummy_port_info;
 239
 240         return ata_pci_sff_init_one(pdev, ppi, &atiixp_sht, NULL);
 241 }
 242
 243 static const struct pci_device_id atiixp[] = {
 244         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
 245         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
 246         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
 247         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
 248         { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },
 249
 250         { },
 251 };
 252
 253 static struct pci_driver atiixp_pci_driver = {
 254         .name           = DRV_NAME,
 255         .id_table       = atiixp,
 256         .probe          = atiixp_init_one,
 257         .remove         = ata_pci_remove_one,
 258 #ifdef CONFIG_PM
 259         .resume         = ata_pci_device_resume,
 260         .suspend        = ata_pci_device_suspend,
 261 #endif
 262 };
 263
 264 static int __init atiixp_init(void)
 265 {
 266         return pci_register_driver(&atiixp_pci_driver);
 267 }
 268
 269
 270 static void __exit atiixp_exit(void)
 271 {
 272         pci_unregister_driver(&atiixp_pci_driver);
 273 }
 274
 275 MODULE_AUTHOR("Alan Cox");
 276 MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
 277 MODULE_LICENSE("GPL");
 278 MODULE_DEVICE_TABLE(pci, atiixp);
 279 MODULE_VERSION(DRV_VERSION);
 280
 281 module_init(atiixp_init);
 282 module_exit(atiixp_exit);