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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/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 - 1, 0, 15) |
 66                   (clamp_val(t.active - 1, 0, 15) << 4);
 67         time_8 = clamp_val(t.act8b - 1, 0, 15) |
 68                  (clamp_val(t.rec8b - 1, 0, 15) << 4);
 69 
 70         if (adev->devno == 0) {
 71                 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
 72 
 73                 addr &= ~0x0F;  /* Mask bits */
 74                 addr |= clamp_val(t.setup - 1, 0, 15);
 75 
 76                 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
 77                 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
 78                 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
 79                 pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
 80         } else {
 81                 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
 82 
 83                 addr &= ~0xF0;  /* Mask bits */
 84                 addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
 85 
 86                 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
 87                 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
 88                 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
 89                 pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
 90         }
 91 }
 92 
 93 /**
 94  *      cy82c693_set_dmamode    -       set initial DMA mode data
 95  *      @ap: ATA interface
 96  *      @adev: ATA device
 97  *
 98  *      Called to do the DMA mode setup.
 99  */
100 
101 static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
102 {
103         int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
104 
105         /* Be afraid, be very afraid. Magic registers  in low I/O space */
106         outb(reg, 0x22);
107         outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
108 
109         /* 0x50 gives the best behaviour on the Alpha's using this chip */
110         outb(CY82_INDEX_TIMEOUT, 0x22);
111         outb(0x50, 0x23);
112 }
113 
114 static struct scsi_host_template cy82c693_sht = {
115         ATA_BMDMA_SHT(DRV_NAME),
116 };
117 
118 static struct ata_port_operations cy82c693_port_ops = {
119         .inherits       = &ata_bmdma_port_ops,
120         .cable_detect   = ata_cable_40wire,
121         .set_piomode    = cy82c693_set_piomode,
122         .set_dmamode    = cy82c693_set_dmamode,
123 };
124 
125 static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
126 {
127         static const struct ata_port_info info = {
128                 .flags = ATA_FLAG_SLAVE_POSS,
129                 .pio_mask = ATA_PIO4,
130                 .mwdma_mask = ATA_MWDMA2,
131                 .port_ops = &cy82c693_port_ops
132         };
133         const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
134 
135         /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
136            For the moment we don't handle the secondary. FIXME */
137 
138         if (PCI_FUNC(pdev->devfn) != 1)
139                 return -ENODEV;
140 
141         return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);
142 }
143 
144 static const struct pci_device_id cy82c693[] = {
145         { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
146 
147         { },
148 };
149 
150 static struct pci_driver cy82c693_pci_driver = {
151         .name           = DRV_NAME,
152         .id_table       = cy82c693,
153         .probe          = cy82c693_init_one,
154         .remove         = ata_pci_remove_one,
155 #ifdef CONFIG_PM
156         .suspend        = ata_pci_device_suspend,
157         .resume         = ata_pci_device_resume,
158 #endif
159 };
160 
161 module_pci_driver(cy82c693_pci_driver);
162 
163 MODULE_AUTHOR("Alan Cox");
164 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
165 MODULE_LICENSE("GPL");
166 MODULE_DEVICE_TABLE(pci, cy82c693);
167 MODULE_VERSION(DRV_VERSION);
168 

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