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 <alan@redhat.com>
   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 "0.1.2"
  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 static int cy82c693_pre_reset(struct ata_port *ap)
  45 {
  46         ap->cbl = ATA_CBL_PATA40;
  47         return ata_std_prereset(ap);
  48 }
  49
  50 static void cy82c693_error_handler(struct ata_port *ap)
  51 {
  52         ata_bmdma_drive_eh(ap, cy82c693_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  53 }
  54
  55 /**
  56  *      cy82c693_set_piomode    -       set initial PIO mode data
  57  *      @ap: ATA interface
  58  *      @adev: ATA device
  59  *
  60  *      Called to do the PIO mode setup.
  61  */
  62
  63 static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
  64 {
  65         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  66         struct ata_timing t;
  67         const unsigned long T = 1000000 / 33;
  68         short time_16, time_8;
  69         u32 addr;
  70
  71         if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
  72                 printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
  73                 return;
  74         }
  75
  76         time_16 = FIT(t.recover, 0, 15) | (FIT(t.active, 0, 15) << 4);
  77         time_8 = FIT(t.act8b, 0, 15) | (FIT(t.rec8b, 0, 15) << 4);
  78
  79         if (adev->devno == 0) {
  80                 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  81
  82                 addr &= ~0x0F;  /* Mask bits */
  83                 addr |= FIT(t.setup, 0, 15);
  84
  85                 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  86                 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
  87                 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
  88                 pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
  89         } else {
  90                 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  91
  92                 addr &= ~0xF0;  /* Mask bits */
  93                 addr |= (FIT(t.setup, 0, 15) << 4);
  94
  95                 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  96                 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
  97                 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
  98                 pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
  99         }
 100 }
 101
 102 /**
 103  *      cy82c693_set_dmamode    -       set initial DMA mode data
 104  *      @ap: ATA interface
 105  *      @adev: ATA device
 106  *
 107  *      Called to do the DMA mode setup.
 108  */
 109
 110 static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 111 {
 112         int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
 113
 114         /* Be afraid, be very afraid. Magic registers  in low I/O space */
 115         outb(reg, 0x22);
 116         outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
 117
 118         /* 0x50 gives the best behaviour on the Alpha's using this chip */
 119         outb(CY82_INDEX_TIMEOUT, 0x22);
 120         outb(0x50, 0x23);
 121 }
 122
 123 static struct scsi_host_template cy82c693_sht = {
 124         .module                 = THIS_MODULE,
 125         .name                   = DRV_NAME,
 126         .ioctl                  = ata_scsi_ioctl,
 127         .queuecommand           = ata_scsi_queuecmd,
 128         .can_queue              = ATA_DEF_QUEUE,
 129         .this_id                = ATA_SHT_THIS_ID,
 130         .sg_tablesize           = LIBATA_MAX_PRD,
 131         .max_sectors            = ATA_MAX_SECTORS,
 132         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 133         .emulated               = ATA_SHT_EMULATED,
 134         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 135         .proc_name              = DRV_NAME,
 136         .dma_boundary           = ATA_DMA_BOUNDARY,
 137         .slave_configure        = ata_scsi_slave_config,
 138         .bios_param             = ata_std_bios_param,
 139 };
 140
 141 static struct ata_port_operations cy82c693_port_ops = {
 142         .port_disable   = ata_port_disable,
 143         .set_piomode    = cy82c693_set_piomode,
 144         .set_dmamode    = cy82c693_set_dmamode,
 145         .mode_filter    = ata_pci_default_filter,
 146
 147         .tf_load        = ata_tf_load,
 148         .tf_read        = ata_tf_read,
 149         .check_status   = ata_check_status,
 150         .exec_command   = ata_exec_command,
 151         .dev_select     = ata_std_dev_select,
 152
 153         .freeze         = ata_bmdma_freeze,
 154         .thaw           = ata_bmdma_thaw,
 155         .error_handler  = cy82c693_error_handler,
 156         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 157
 158         .bmdma_setup    = ata_bmdma_setup,
 159         .bmdma_start    = ata_bmdma_start,
 160         .bmdma_stop     = ata_bmdma_stop,
 161         .bmdma_status   = ata_bmdma_status,
 162
 163         .qc_prep        = ata_qc_prep,
 164         .qc_issue       = ata_qc_issue_prot,
 165         .eng_timeout    = ata_eng_timeout,
 166         .data_xfer      = ata_pio_data_xfer,
 167
 168         .irq_handler    = ata_interrupt,
 169         .irq_clear      = ata_bmdma_irq_clear,
 170
 171         .port_start     = ata_port_start,
 172         .port_stop      = ata_port_stop,
 173         .host_stop      = ata_host_stop
 174 };
 175
 176 static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 177 {
 178         static struct ata_port_info info = {
 179                 .sht = &cy82c693_sht,
 180                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 181                 .pio_mask = 0x1f,
 182                 .mwdma_mask = 0x07,
 183                 .port_ops = &cy82c693_port_ops
 184         };
 185         static struct ata_port_info *port_info[1] = { &info };
 186
 187         /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2. For the
 188            moment we don't handle the secondary. FIXME */
 189
 190         if (PCI_FUNC(pdev->devfn) != 1)
 191                 return -ENODEV;
 192
 193         return ata_pci_init_one(pdev, port_info, 1);
 194 }
 195
 196 static struct pci_device_id cy82c693[] = {
 197         { PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 198         { 0, },
 199 };
 200
 201 static struct pci_driver cy82c693_pci_driver = {
 202         .name           = DRV_NAME,
 203         .id_table       = cy82c693,
 204         .probe          = cy82c693_init_one,
 205         .remove         = ata_pci_remove_one
 206 };
 207
 208 static int __init cy82c693_init(void)
 209 {
 210         return pci_register_driver(&cy82c693_pci_driver);
 211 }
 212
 213
 214 static void __exit cy82c693_exit(void)
 215 {
 216         pci_unregister_driver(&cy82c693_pci_driver);
 217 }
 218
 219
 220 MODULE_AUTHOR("Alan Cox");
 221 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
 222 MODULE_LICENSE("GPL");
 223 MODULE_DEVICE_TABLE(pci, cy82c693);
 224 MODULE_VERSION(DRV_VERSION);
 225
 226 module_init(cy82c693_init);
 227 module_exit(cy82c693_exit);