root/drivers/ata/pata_cypress.c

DEFINITIONS

1. cy82c693_set_piomode
2. cy82c693_set_dmamode
3. cy82c693_init_one

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * pata_cypress.c       - Cypress PATA for new ATA layer
   4  *                        (C) 2006 Red Hat Inc
   5  *                        Alan Cox
   6  *
   7  * Based heavily on
   8  * linux/drivers/ide/pci/cy82c693.c             Version 0.40    Sep. 10, 2002
   9  *
  10  */
  11 
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.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_SLEEP
 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);