drivers/ata/pata_cypress.c

   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
  24 enum {
  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
  51 static 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
 100 static 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
 113 static struct scsi_host_template cy82c693_sht = {
 114         ATA_BMDMA_SHT(DRV_NAME),
 115 };
 116
 117 static 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
 124 static 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
 143 static const struct pci_device_id cy82c693[] = {
 144         { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
 145
 146         { },
 147 };
 148
 149 static 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
 160 module_pci_driver(cy82c693_pci_driver);
 161
 162 MODULE_AUTHOR("Alan Cox");
 163 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
 164 MODULE_LICENSE("GPL");
 165 MODULE_DEVICE_TABLE(pci, cy82c693);
 166 MODULE_VERSION(DRV_VERSION);