LXR linux/drivers/ata/pata

   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
  25enum {
  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
  44static bool enable_dma = true;
  45module_param(enable_dma, bool, 0);
  46MODULE_PARM_DESC(enable_dma, "Enable bus master DMA operations");
  47
  48/**
  49 *      cy82c693_set_piomode    -       set initial PIO mode data
  50 *      @ap: ATA interface
  51 *      @adev: ATA device
  52 *
  53 *      Called to do the PIO mode setup.
  54 */
  55
  56static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
  57{
  58        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  59        struct ata_timing t;
  60        const unsigned long T = 1000000 / 33;
  61        short time_16, time_8;
  62        u32 addr;
  63
  64        if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
  65                printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
  66                return;
  67        }
  68
  69        time_16 = clamp_val(t.recover - 1, 0, 15) |
  70                  (clamp_val(t.active - 1, 0, 15) << 4);
  71        time_8 = clamp_val(t.act8b - 1, 0, 15) |
  72                 (clamp_val(t.rec8b - 1, 0, 15) << 4);
  73
  74        if (adev->devno == 0) {
  75                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  76
  77                addr &= ~0x0F;  /* Mask bits */
  78                addr |= clamp_val(t.setup - 1, 0, 15);
  79
  80                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  81                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
  82                pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
  83                pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
  84        } else {
  85                pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
  86
  87                addr &= ~0xF0;  /* Mask bits */
  88                addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
  89
  90                pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
  91                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
  92                pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
  93                pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
  94        }
  95}
  96
  97/**
  98 *      cy82c693_set_dmamode    -       set initial DMA mode data
  99 *      @ap: ATA interface
 100 *      @adev: ATA device
 101 *
 102 *      Called to do the DMA mode setup.
 103 */
 104
 105static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 106{
 107        int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
 108
 109        /* Be afraid, be very afraid. Magic registers  in low I/O space */
 110        outb(reg, 0x22);
 111        outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
 112
 113        /* 0x50 gives the best behaviour on the Alpha's using this chip */
 114        outb(CY82_INDEX_TIMEOUT, 0x22);
 115        outb(0x50, 0x23);
 116}
 117
 118static struct scsi_host_template cy82c693_sht = {
 119        ATA_BMDMA_SHT(DRV_NAME),
 120};
 121
 122static struct ata_port_operations cy82c693_port_ops = {
 123        .inherits       = &ata_bmdma_port_ops,
 124        .cable_detect   = ata_cable_40wire,
 125        .set_piomode    = cy82c693_set_piomode,
 126        .set_dmamode    = cy82c693_set_dmamode,
 127};
 128
 129static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 130{
 131        static struct ata_port_info info = {
 132                .flags = ATA_FLAG_SLAVE_POSS,
 133                .pio_mask = ATA_PIO4,
 134                .port_ops = &cy82c693_port_ops
 135        };
 136        const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 137
 138        if (enable_dma)
 139                info.mwdma_mask = ATA_MWDMA2;
 140
 141        /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
 142           For the moment we don't handle the secondary. FIXME */
 143
 144        if (PCI_FUNC(pdev->devfn) != 1)
 145                return -ENODEV;
 146
 147        return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);
 148}
 149
 150static const struct pci_device_id cy82c693[] = {
 151        { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
 152
 153        { },
 154};
 155
 156static struct pci_driver cy82c693_pci_driver = {
 157        .name           = DRV_NAME,
 158        .id_table       = cy82c693,
 159        .probe          = cy82c693_init_one,
 160        .remove         = ata_pci_remove_one,
 161#ifdef CONFIG_PM_SLEEP
 162        .suspend        = ata_pci_device_suspend,
 163        .resume         = ata_pci_device_resume,
 164#endif
 165};
 166
 167module_pci_driver(cy82c693_pci_driver);
 168
 169MODULE_AUTHOR("Alan Cox");
 170MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
 171MODULE_LICENSE("GPL");
 172MODULE_DEVICE_TABLE(pci, cy82c693);
 173MODULE_VERSION(DRV_VERSION);
 174