LXR linux/drivers/ata/pata

   1/*
   2 * pata_cypress.c       - Cypress PATA for new ATA layer
   3 *                        (C) 2006 Red Hat Inc
   4 *                        Alan Cox
   5 *
   6 * Based heavily on
   7 * linux/drivers/ide/pci/cy82c693.c             Version 0.40    Sep. 10, 2002
   8 *
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/pci.h>
  14#include <linux/blkdev.h>
  15#include <linux/delay.h>
  16#include <scsi/scsi_host.h>
  17#include <linux/libata.h>
  18
  19#define DRV_NAME "pata_cypress"
  20#define DRV_VERSION "0.1.5"
  21
  22/* here are the offset definitions for the registers */
  23
  24enum {
  25        CY82_IDE_CMDREG         = 0x04,
  26        CY82_IDE_ADDRSETUP      = 0x48,
  27        CY82_IDE_MASTER_IOR     = 0x4C,
  28        CY82_IDE_MASTER_IOW     = 0x4D,
  29        CY82_IDE_SLAVE_IOR      = 0x4E,
  30        CY82_IDE_SLAVE_IOW      = 0x4F,
  31        CY82_IDE_MASTER_8BIT    = 0x50,
  32        CY82_IDE_SLAVE_8BIT     = 0x51,
  33
  34        CY82_INDEX_PORT         = 0x22,
  35        CY82_DATA_PORT          = 0x23,
  36
  37        CY82_INDEX_CTRLREG1     = 0x01,
  38        CY82_INDEX_CHANNEL0     = 0x30,
  39        CY82_INDEX_CHANNEL1     = 0x31,
  40        CY82_INDEX_TIMEOUT      = 0x32
  41};
  42
  43/**
  44 *      cy82c693_set_piomode    -       set initial PIO mode data
  45 *      @ap: ATA interface
  46 *      @adev: ATA device
  47 *
  48 *      Called to do the PIO mode setup.
  49 */
  50
  51static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
  52{
  53        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  54        struct ata_timing t;
  55        const unsigned long T = 1000000 / 33;
  56        short time_16, time_8;
  57        u32 addr;
  58
  59        if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
  60                printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
  61                return;
  62        }
  63
  64        time_16 = clamp_val(t.recover - 1, 0, 15) |
  65                  (clamp_val(t.active - 1, 0, 15) << 4);
  66        time_8 = clamp_val(t.act8b - 1, 0, 15) |
  67                 (clamp_val(t.rec8b - 1, 0, 15) << 4);
  68
  69        if (adev->devno == 0) {
  70                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  71
  72                addr &= ~0x0F;  /* Mask bits */
  73                addr |= clamp_val(t.setup - 1, 0, 15);
  74
  75                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  76                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
  77                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
  78                pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
  79        } else {
  80                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  81
  82                addr &= ~0xF0;  /* Mask bits */
  83                addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
  84
  85                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  86                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
  87                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
  88                pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
  89        }
  90}
  91
  92/**
  93 *      cy82c693_set_dmamode    -       set initial DMA mode data
  94 *      @ap: ATA interface
  95 *      @adev: ATA device
  96 *
  97 *      Called to do the DMA mode setup.
  98 */
  99
 100static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 101{
 102        int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
 103
 104        /* Be afraid, be very afraid. Magic registers  in low I/O space */
 105        outb(reg, 0x22);
 106        outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
 107
 108        /* 0x50 gives the best behaviour on the Alpha's using this chip */
 109        outb(CY82_INDEX_TIMEOUT, 0x22);
 110        outb(0x50, 0x23);
 111}
 112
 113static struct scsi_host_template cy82c693_sht = {
 114        ATA_BMDMA_SHT(DRV_NAME),
 115};
 116
 117static struct ata_port_operations cy82c693_port_ops = {
 118        .inherits       = &ata_bmdma_port_ops,
 119        .cable_detect   = ata_cable_40wire,
 120        .set_piomode    = cy82c693_set_piomode,
 121        .set_dmamode    = cy82c693_set_dmamode,
 122};
 123
 124static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 125{
 126        static const struct ata_port_info info = {
 127                .flags = ATA_FLAG_SLAVE_POSS,
 128                .pio_mask = ATA_PIO4,
 129                .mwdma_mask = ATA_MWDMA2,
 130                .port_ops = &cy82c693_port_ops
 131        };
 132        const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 133
 134        /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
 135           For the moment we don't handle the secondary. FIXME */
 136
 137        if (PCI_FUNC(pdev->devfn) != 1)
 138                return -ENODEV;
 139
 140        return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);
 141}
 142
 143static const struct pci_device_id cy82c693[] = {
 144        { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
 145
 146        { },
 147};
 148
 149static struct pci_driver cy82c693_pci_driver = {
 150        .name           = DRV_NAME,
 151        .id_table       = cy82c693,
 152        .probe          = cy82c693_init_one,
 153        .remove         = ata_pci_remove_one,
 154#ifdef CONFIG_PM_SLEEP
 155        .suspend        = ata_pci_device_suspend,
 156        .resume         = ata_pci_device_resume,
 157#endif
 158};
 159
 160module_pci_driver(cy82c693_pci_driver);
 161
 162MODULE_AUTHOR("Alan Cox");
 163MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
 164MODULE_LICENSE("GPL");
 165MODULE_DEVICE_TABLE(pci, cy82c693);
 166MODULE_VERSION(DRV_VERSION);
 167