LXR linux/drivers/ata/pata

   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 */
  41enum {
  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
  51static int sch_init_one(struct pci_dev *pdev,
  52                         const struct pci_device_id *ent);
  53static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev);
  54static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev);
  55
  56static 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
  62static 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
  73static struct scsi_host_template sch_sht = {
  74        ATA_BMDMA_SHT(DRV_NAME),
  75};
  76
  77static 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
  84static 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
  92MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
  93MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers");
  94MODULE_LICENSE("GPL");
  95MODULE_DEVICE_TABLE(pci, sch_pci_tbl);
  96MODULE_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
 109static 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
 138static 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
 171static 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
 180module_pci_driver(sch_pci_driver);
 181