drivers/ata/pata_radisys.c

   1 /*
   2  *    pata_radisys.c - Intel PATA/SATA controllers
   3  *
   4  *      (C) 2006 Red Hat <alan@lxorguk.ukuu.org.uk>
   5  *
   6  *    Some parts based on ata_piix.c by Jeff Garzik and others.
   7  *
   8  *    A PIIX relative, this device has a single ATA channel and no
   9  *    slave timings, SITRE or PPE. In that sense it is a close relative
  10  *    of the original PIIX. It does however support UDMA 33/66 per channel
  11  *    although no other modes/timings. Also lacking is 32bit I/O on the ATA
  12  *    port.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/blkdev.h>
  19 #include <linux/delay.h>
  20 #include <linux/device.h>
  21 #include <scsi/scsi_host.h>
  22 #include <linux/libata.h>
  23 #include <linux/ata.h>
  24
  25 #define DRV_NAME        "pata_radisys"
  26 #define DRV_VERSION     "0.4.4"
  27
  28 /**
  29  *      radisys_set_piomode - Initialize host controller PATA PIO timings
  30  *      @ap: ATA port
  31  *      @adev: Device whose timings we are configuring
  32  *
  33  *      Set PIO mode for device, in host controller PCI config space.
  34  *
  35  *      LOCKING:
  36  *      None (inherited from caller).
  37  */
  38
  39 static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
  40 {
  41         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
  42         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  43         u16 idetm_data;
  44         int control = 0;
  45
  46         /*
  47          *      See Intel Document 298600-004 for the timing programing rules
  48          *      for PIIX/ICH. Note that the early PIIX does not have the slave
  49          *      timing port at 0x44. The Radisys is a relative of the PIIX
  50          *      but not the same so be careful.
  51          */
  52
  53         static const     /* ISP  RTC */
  54         u8 timings[][2] = { { 0, 0 },   /* Check me */
  55                             { 0, 0 },
  56                             { 1, 1 },
  57                             { 2, 2 },
  58                             { 3, 3 }, };
  59
  60         if (pio > 0)
  61                 control |= 1;   /* TIME1 enable */
  62         if (ata_pio_need_iordy(adev))
  63                 control |= 2;   /* IE IORDY */
  64
  65         pci_read_config_word(dev, 0x40, &idetm_data);
  66
  67         /* Enable IE and TIME as appropriate. Clear the other
  68            drive timing bits */
  69         idetm_data &= 0xCCCC;
  70         idetm_data |= (control << (4 * adev->devno));
  71         idetm_data |= (timings[pio][0] << 12) |
  72                         (timings[pio][1] << 8);
  73         pci_write_config_word(dev, 0x40, idetm_data);
  74
  75         /* Track which port is configured */
  76         ap->private_data = adev;
  77 }
  78
  79 /**
  80  *      radisys_set_dmamode - Initialize host controller PATA DMA timings
  81  *      @ap: Port whose timings we are configuring
  82  *      @adev: Device to program
  83  *
  84  *      Set MWDMA mode for device, in host controller PCI config space.
  85  *
  86  *      LOCKING:
  87  *      None (inherited from caller).
  88  */
  89
  90 static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
  91 {
  92         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  93         u16 idetm_data;
  94         u8 udma_enable;
  95
  96         static const     /* ISP  RTC */
  97         u8 timings[][2] = { { 0, 0 },
  98                             { 0, 0 },
  99                             { 1, 1 },
 100                             { 2, 2 },
 101                             { 3, 3 }, };
 102
 103         /*
 104          * MWDMA is driven by the PIO timings. We must also enable
 105          * IORDY unconditionally.
 106          */
 107
 108         pci_read_config_word(dev, 0x40, &idetm_data);
 109         pci_read_config_byte(dev, 0x48, &udma_enable);
 110
 111         if (adev->dma_mode < XFER_UDMA_0) {
 112                 unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 113                 const unsigned int needed_pio[3] = {
 114                         XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 115                 };
 116                 int pio = needed_pio[mwdma] - XFER_PIO_0;
 117                 int control = 3;        /* IORDY|TIME0 */
 118
 119                 /* If the drive MWDMA is faster than it can do PIO then
 120                    we must force PIO0 for PIO cycles. */
 121
 122                 if (adev->pio_mode < needed_pio[mwdma])
 123                         control = 1;
 124
 125                 /* Mask out the relevant control and timing bits we will load. Also
 126                    clear the other drive TIME register as a precaution */
 127
 128                 idetm_data &= 0xCCCC;
 129                 idetm_data |= control << (4 * adev->devno);
 130                 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
 131
 132                 udma_enable &= ~(1 << adev->devno);
 133         } else {
 134                 u8 udma_mode;
 135
 136                 /* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */
 137
 138                 pci_read_config_byte(dev, 0x4A, &udma_mode);
 139
 140                 if (adev->xfer_mode == XFER_UDMA_2)
 141                         udma_mode &= ~(2 << (adev->devno * 4));
 142                 else /* UDMA 4 */
 143                         udma_mode |= (2 << (adev->devno * 4));
 144
 145                 pci_write_config_byte(dev, 0x4A, udma_mode);
 146
 147                 udma_enable |= (1 << adev->devno);
 148         }
 149         pci_write_config_word(dev, 0x40, idetm_data);
 150         pci_write_config_byte(dev, 0x48, udma_enable);
 151
 152         /* Track which port is configured */
 153         ap->private_data = adev;
 154 }
 155
 156 /**
 157  *      radisys_qc_issue        -       command issue
 158  *      @qc: command pending
 159  *
 160  *      Called when the libata layer is about to issue a command. We wrap
 161  *      this interface so that we can load the correct ATA timings if
 162  *      necessary. Our logic also clears TIME0/TIME1 for the other device so
 163  *      that, even if we get this wrong, cycles to the other device will
 164  *      be made PIO0.
 165  */
 166
 167 static unsigned int radisys_qc_issue(struct ata_queued_cmd *qc)
 168 {
 169         struct ata_port *ap = qc->ap;
 170         struct ata_device *adev = qc->dev;
 171
 172         if (adev != ap->private_data) {
 173                 /* UDMA timing is not shared */
 174                 if (adev->dma_mode < XFER_UDMA_0) {
 175                         if (adev->dma_mode)
 176                                 radisys_set_dmamode(ap, adev);
 177                         else if (adev->pio_mode)
 178                                 radisys_set_piomode(ap, adev);
 179                 }
 180         }
 181         return ata_bmdma_qc_issue(qc);
 182 }
 183
 184
 185 static struct scsi_host_template radisys_sht = {
 186         ATA_BMDMA_SHT(DRV_NAME),
 187 };
 188
 189 static struct ata_port_operations radisys_pata_ops = {
 190         .inherits               = &ata_bmdma_port_ops,
 191         .qc_issue               = radisys_qc_issue,
 192         .cable_detect           = ata_cable_unknown,
 193         .set_piomode            = radisys_set_piomode,
 194         .set_dmamode            = radisys_set_dmamode,
 195 };
 196
 197
 198 /**
 199  *      radisys_init_one - Register PIIX ATA PCI device with kernel services
 200  *      @pdev: PCI device to register
 201  *      @ent: Entry in radisys_pci_tbl matching with @pdev
 202  *
 203  *      Called from kernel PCI layer.  We probe for combined mode (sigh),
 204  *      and then hand over control to libata, for it to do the rest.
 205  *
 206  *      LOCKING:
 207  *      Inherited from PCI layer (may sleep).
 208  *
 209  *      RETURNS:
 210  *      Zero on success, or -ERRNO value.
 211  */
 212
 213 static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 214 {
 215         static const struct ata_port_info info = {
 216                 .flags          = ATA_FLAG_SLAVE_POSS,
 217                 .pio_mask       = ATA_PIO4,
 218                 .mwdma_mask     = ATA_MWDMA12_ONLY,
 219                 .udma_mask      = ATA_UDMA24_ONLY,
 220                 .port_ops       = &radisys_pata_ops,
 221         };
 222         const struct ata_port_info *ppi[] = { &info, NULL };
 223
 224         ata_print_version_once(&pdev->dev, DRV_VERSION);
 225
 226         return ata_pci_bmdma_init_one(pdev, ppi, &radisys_sht, NULL, 0);
 227 }
 228
 229 static const struct pci_device_id radisys_pci_tbl[] = {
 230         { PCI_VDEVICE(RADISYS, 0x8201), },
 231
 232         { }     /* terminate list */
 233 };
 234
 235 static struct pci_driver radisys_pci_driver = {
 236         .name                   = DRV_NAME,
 237         .id_table               = radisys_pci_tbl,
 238         .probe                  = radisys_init_one,
 239         .remove                 = ata_pci_remove_one,
 240 #ifdef CONFIG_PM
 241         .suspend                = ata_pci_device_suspend,
 242         .resume                 = ata_pci_device_resume,
 243 #endif
 244 };
 245
 246 module_pci_driver(radisys_pci_driver);
 247
 248 MODULE_AUTHOR("Alan Cox");
 249 MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
 250 MODULE_LICENSE("GPL");
 251 MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
 252 MODULE_VERSION(DRV_VERSION);