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/init.h>
  15#include <linux/blkdev.h>
  16#include <linux/delay.h>
  17#include <scsi/scsi_host.h>
  18#include <linux/libata.h>
  19
  20#define DRV_NAME "pata_cypress"
  21#define DRV_VERSION "0.1.5"
  22
  23/* here are the offset definitions for the registers */
  24
  25enum {
  26        CY82_IDE_CMDREG         = 0x04,
  27        CY82_IDE_ADDRSETUP      = 0x48,
  28        CY82_IDE_MASTER_IOR     = 0x4C,
  29        CY82_IDE_MASTER_IOW     = 0x4D,
  30        CY82_IDE_SLAVE_IOR      = 0x4E,
  31        CY82_IDE_SLAVE_IOW      = 0x4F,
  32        CY82_IDE_MASTER_8BIT    = 0x50,
  33        CY82_IDE_SLAVE_8BIT     = 0x51,
  34
  35        CY82_INDEX_PORT         = 0x22,
  36        CY82_DATA_PORT          = 0x23,
  37
  38        CY82_INDEX_CTRLREG1     = 0x01,
  39        CY82_INDEX_CHANNEL0     = 0x30,
  40        CY82_INDEX_CHANNEL1     = 0x31,
  41        CY82_INDEX_TIMEOUT      = 0x32
  42};
  43
  44/**
  45 *      cy82c693_set_piomode    -       set initial PIO mode data
  46 *      @ap: ATA interface
  47 *      @adev: ATA device
  48 *
  49 *      Called to do the PIO mode setup.
  50 */
  51
  52static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
  53{
  54        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  55        struct ata_timing t;
  56        const unsigned long T = 1000000 / 33;
  57        short time_16, time_8;
  58        u32 addr;
  59
  60        if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
  61                printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
  62                return;
  63        }
  64
  65        time_16 = clamp_val(t.recover, 0, 15) | (clamp_val(t.active, 0, 15) << 4);
  66        time_8 = clamp_val(t.act8b, 0, 15) | (clamp_val(t.rec8b, 0, 15) << 4);
  67
  68        if (adev->devno == 0) {
  69                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  70
  71                addr &= ~0x0F;  /* Mask bits */
  72                addr |= clamp_val(t.setup, 0, 15);
  73
  74                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  75                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
  76                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
  77                pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
  78        } else {
  79                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  80
  81                addr &= ~0xF0;  /* Mask bits */
  82                addr |= (clamp_val(t.setup, 0, 15) << 4);
  83
  84                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  85                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
  86                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
  87                pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
  88        }
  89}
  90
  91/**
  92 *      cy82c693_set_dmamode    -       set initial DMA mode data
  93 *      @ap: ATA interface
  94 *      @adev: ATA device
  95 *
  96 *      Called to do the DMA mode setup.
  97 */
  98
  99static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 100{
 101        int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
 102
 103        /* Be afraid, be very afraid. Magic registers  in low I/O space */
 104        outb(reg, 0x22);
 105        outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
 106
 107        /* 0x50 gives the best behaviour on the Alpha's using this chip */
 108        outb(CY82_INDEX_TIMEOUT, 0x22);
 109        outb(0x50, 0x23);
 110}
 111
 112static struct scsi_host_template cy82c693_sht = {
 113        ATA_BMDMA_SHT(DRV_NAME),
 114};
 115
 116static struct ata_port_operations cy82c693_port_ops = {
 117        .inherits       = &ata_bmdma_port_ops,
 118        .cable_detect   = ata_cable_40wire,
 119        .set_piomode    = cy82c693_set_piomode,
 120        .set_dmamode    = cy82c693_set_dmamode,
 121};
 122
 123static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 124{
 125        static const struct ata_port_info info = {
 126                .flags = ATA_FLAG_SLAVE_POSS,
 127                .pio_mask = ATA_PIO4,
 128                .mwdma_mask = ATA_MWDMA2,
 129                .port_ops = &cy82c693_port_ops
 130        };
 131        const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 132
 133        /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
 134           For the moment we don't handle the secondary. FIXME */
 135
 136        if (PCI_FUNC(pdev->devfn) != 1)
 137                return -ENODEV;
 138
 139        return ata_pci_sff_init_one(pdev, ppi, &cy82c693_sht, NULL);
 140}
 141
 142static const struct pci_device_id cy82c693[] = {
 143        { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
 144
 145        { },
 146};
 147
 148static struct pci_driver cy82c693_pci_driver = {
 149        .name           = DRV_NAME,
 150        .id_table       = cy82c693,
 151        .probe          = cy82c693_init_one,
 152        .remove         = ata_pci_remove_one,
 153#ifdef CONFIG_PM
 154        .suspend        = ata_pci_device_suspend,
 155        .resume         = ata_pci_device_resume,
 156#endif
 157};
 158
 159static int __init cy82c693_init(void)
 160{
 161        return pci_register_driver(&cy82c693_pci_driver);
 162}
 163
 164
 165static void __exit cy82c693_exit(void)
 166{
 167        pci_unregister_driver(&cy82c693_pci_driver);
 168}
 169
 170
 171MODULE_AUTHOR("Alan Cox");
 172MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
 173MODULE_LICENSE("GPL");
 174MODULE_DEVICE_TABLE(pci, cy82c693);
 175MODULE_VERSION(DRV_VERSION);
 176
 177module_init(cy82c693_init);
 178module_exit(cy82c693_exit);
 179