drivers/ata/pata_sch.c

   1 /*
   2  *  pata_sch.c - Intel SCH PATA controllers
   3  *
   4  *  Copyright (c) 2008 Alek Du <alek.du@intel.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; see the file COPYING.  If not, write to
  17  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 /*
  22  *  Supports:
  23  *    Intel SCH (AF82US15W, AF82US15L, AF82UL11L) chipsets -- see spec at:
  24  *    http://download.intel.com/design/chipsets/embedded/datashts/319537.pdf
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/delay.h>
  32 #include <linux/device.h>
  33 #include <scsi/scsi_host.h>
  34 #include <linux/libata.h>
  35 #include <linux/dmi.h>
  36
  37 #define DRV_NAME        "pata_sch"
  38 #define DRV_VERSION     "0.2"
  39
  40 /* see SCH datasheet page 351 */
  41 enum {
  42         D0TIM   = 0x80,         /* Device 0 Timing Register */
  43         D1TIM   = 0x84,         /* Device 1 Timing Register */
  44         PM      = 0x07,         /* PIO Mode Bit Mask */
  45         MDM     = (0x03 << 8),  /* Multi-word DMA Mode Bit Mask */
  46         UDM     = (0x07 << 16), /* Ultra DMA Mode Bit Mask */
  47         PPE     = (1 << 30),    /* Prefetch/Post Enable */
  48         USD     = (1 << 31),    /* Use Synchronous DMA */
  49 };
  50
  51 static int sch_init_one(struct pci_dev *pdev,
  52                          const struct pci_device_id *ent);
  53 static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev);
  54 static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev);
  55
  56 static const struct pci_device_id sch_pci_tbl[] = {
  57         /* Intel SCH PATA Controller */
  58         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 },
  59         { }     /* terminate list */
  60 };
  61
  62 static struct pci_driver sch_pci_driver = {
  63         .name                   = DRV_NAME,
  64         .id_table               = sch_pci_tbl,
  65         .probe                  = sch_init_one,
  66         .remove                 = ata_pci_remove_one,
  67 #ifdef CONFIG_PM_SLEEP
  68         .suspend                = ata_pci_device_suspend,
  69         .resume                 = ata_pci_device_resume,
  70 #endif
  71 };
  72
  73 static struct scsi_host_template sch_sht = {
  74         ATA_BMDMA_SHT(DRV_NAME),
  75 };
  76
  77 static struct ata_port_operations sch_pata_ops = {
  78         .inherits               = &ata_bmdma_port_ops,
  79         .cable_detect           = ata_cable_unknown,
  80         .set_piomode            = sch_set_piomode,
  81         .set_dmamode            = sch_set_dmamode,
  82 };
  83
  84 static const struct ata_port_info sch_port_info = {
  85         .flags          = ATA_FLAG_SLAVE_POSS,
  86         .pio_mask       = ATA_PIO4,
  87         .mwdma_mask     = ATA_MWDMA2,
  88         .udma_mask      = ATA_UDMA5,
  89         .port_ops       = &sch_pata_ops,
  90 };
  91
  92 MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
  93 MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers");
  94 MODULE_LICENSE("GPL");
  95 MODULE_DEVICE_TABLE(pci, sch_pci_tbl);
  96 MODULE_VERSION(DRV_VERSION);
  97
  98 /**
  99  *      sch_set_piomode - Initialize host controller PATA PIO timings
 100  *      @ap: Port whose timings we are configuring
 101  *      @adev: ATA device
 102  *
 103  *      Set PIO mode for device, in host controller PCI config space.
 104  *
 105  *      LOCKING:
 106  *      None (inherited from caller).
 107  */
 108
 109 static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev)
 110 {
 111         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
 112         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 113         unsigned int port       = adev->devno ? D1TIM : D0TIM;
 114         unsigned int data;
 115
 116         pci_read_config_dword(dev, port, &data);
 117         /* see SCH datasheet page 351 */
 118         /* set PIO mode */
 119         data &= ~(PM | PPE);
 120         data |= pio;
 121         /* enable PPE for block device */
 122         if (adev->class == ATA_DEV_ATA)
 123                 data |= PPE;
 124         pci_write_config_dword(dev, port, data);
 125 }
 126
 127 /**
 128  *      sch_set_dmamode - Initialize host controller PATA DMA timings
 129  *      @ap: Port whose timings we are configuring
 130  *      @adev: ATA device
 131  *
 132  *      Set MW/UDMA mode for device, in host controller PCI config space.
 133  *
 134  *      LOCKING:
 135  *      None (inherited from caller).
 136  */
 137
 138 static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 139 {
 140         unsigned int dma_mode   = adev->dma_mode;
 141         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 142         unsigned int port       = adev->devno ? D1TIM : D0TIM;
 143         unsigned int data;
 144
 145         pci_read_config_dword(dev, port, &data);
 146         /* see SCH datasheet page 351 */
 147         if (dma_mode >= XFER_UDMA_0) {
 148                 /* enable Synchronous DMA mode */
 149                 data |= USD;
 150                 data &= ~UDM;
 151                 data |= (dma_mode - XFER_UDMA_0) << 16;
 152         } else { /* must be MWDMA mode, since we masked SWDMA already */
 153                 data &= ~(USD | MDM);
 154                 data |= (dma_mode - XFER_MW_DMA_0) << 8;
 155         }
 156         pci_write_config_dword(dev, port, data);
 157 }
 158
 159 /**
 160  *      sch_init_one - Register SCH ATA PCI device with kernel services
 161  *      @pdev: PCI device to register
 162  *      @ent: Entry in sch_pci_tbl matching with @pdev
 163  *
 164  *      LOCKING:
 165  *      Inherited from PCI layer (may sleep).
 166  *
 167  *      RETURNS:
 168  *      Zero on success, or -ERRNO value.
 169  */
 170
 171 static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 172 {
 173         const struct ata_port_info *ppi[] = { &sch_port_info, NULL };
 174
 175         ata_print_version_once(&pdev->dev, DRV_VERSION);
 176
 177         return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0);
 178 }
 179
 180 module_pci_driver(sch_pci_driver);