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Linux/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);
167 

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