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/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
  25 enum {
  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
  52 static 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
  99 static 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
 112 static struct scsi_host_template cy82c693_sht = {
 113         ATA_BMDMA_SHT(DRV_NAME),
 114 };
 115
 116 static 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
 123 static 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
 142 static const struct pci_device_id cy82c693[] = {
 143         { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
 144
 145         { },
 146 };
 147
 148 static 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
 159 static int __init cy82c693_init(void)
 160 {
 161         return pci_register_driver(&cy82c693_pci_driver);
 162 }
 163
 164
 165 static void __exit cy82c693_exit(void)
 166 {
 167         pci_unregister_driver(&cy82c693_pci_driver);
 168 }
 169
 170
 171 MODULE_AUTHOR("Alan Cox");
 172 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
 173 MODULE_LICENSE("GPL");
 174 MODULE_DEVICE_TABLE(pci, cy82c693);
 175 MODULE_VERSION(DRV_VERSION);
 176
 177 module_init(cy82c693_init);
 178 module_exit(cy82c693_exit);