LXR linux/drivers/ata/pata

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * pata_ns87410.c       - National Semiconductor 87410 PATA for new ATA layer
   4 *                        (C) 2006 Red Hat Inc
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/module.h>
   9#include <linux/pci.h>
  10#include <linux/blkdev.h>
  11#include <linux/delay.h>
  12#include <scsi/scsi_host.h>
  13#include <linux/libata.h>
  14
  15#define DRV_NAME "pata_ns87410"
  16#define DRV_VERSION "0.4.6"
  17
  18/**
  19 *      ns87410_pre_reset               -       probe begin
  20 *      @link: ATA link
  21 *      @deadline: deadline jiffies for the operation
  22 *
  23 *      Check enabled ports
  24 */
  25
  26static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
  27{
  28        struct ata_port *ap = link->ap;
  29        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  30        static const struct pci_bits ns87410_enable_bits[] = {
  31                { 0x43, 1, 0x08, 0x08 },
  32                { 0x47, 1, 0x08, 0x08 }
  33        };
  34
  35        if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
  36                return -ENOENT;
  37
  38        return ata_sff_prereset(link, deadline);
  39}
  40
  41/**
  42 *      ns87410_set_piomode     -       set initial PIO mode data
  43 *      @ap: ATA interface
  44 *      @adev: ATA device
  45 *
  46 *      Program timing data. This is kept per channel not per device,
  47 *      and only affects the data port.
  48 */
  49
  50static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  51{
  52        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  53        int port = 0x40 + 4 * ap->port_no;
  54        u8 idetcr, idefr;
  55        struct ata_timing at;
  56
  57        static const u8 activebits[15] = {
  58                0, 1, 2, 3, 4,
  59                5, 5, 6, 6, 6,
  60                6, 7, 7, 7, 7
  61        };
  62
  63        static const u8 recoverbits[12] = {
  64                0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  65        };
  66
  67        pci_read_config_byte(pdev, port + 3, &idefr);
  68
  69        if (ata_pio_need_iordy(adev))
  70                idefr |= 0x04;  /* IORDY enable */
  71        else
  72                idefr &= ~0x04;
  73
  74        if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
  75                dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
  76                return;
  77        }
  78
  79        at.active = clamp_val(at.active, 2, 16) - 2;
  80        at.setup = clamp_val(at.setup, 1, 4) - 1;
  81        at.recover = clamp_val(at.recover, 1, 12) - 1;
  82
  83        idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
  84
  85        pci_write_config_byte(pdev, port, idetcr);
  86        pci_write_config_byte(pdev, port + 3, idefr);
  87        /* We use ap->private_data as a pointer to the device currently
  88           loaded for timing */
  89        ap->private_data = adev;
  90}
  91
  92/**
  93 *      ns87410_qc_issue        -       command issue
  94 *      @qc: command pending
  95 *
  96 *      Called when the libata layer is about to issue a command. We wrap
  97 *      this interface so that we can load the correct ATA timings if
  98 *      necessary.
  99 */
 100
 101static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
 102{
 103        struct ata_port *ap = qc->ap;
 104        struct ata_device *adev = qc->dev;
 105
 106        /* If modes have been configured and the channel data is not loaded
 107           then load it. We have to check if pio_mode is set as the core code
 108           does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 109           logical */
 110
 111        if (adev->pio_mode && adev != ap->private_data)
 112                ns87410_set_piomode(ap, adev);
 113
 114        return ata_sff_qc_issue(qc);
 115}
 116
 117static struct scsi_host_template ns87410_sht = {
 118        ATA_PIO_SHT(DRV_NAME),
 119};
 120
 121static struct ata_port_operations ns87410_port_ops = {
 122        .inherits       = &ata_sff_port_ops,
 123        .qc_issue       = ns87410_qc_issue,
 124        .cable_detect   = ata_cable_40wire,
 125        .set_piomode    = ns87410_set_piomode,
 126        .prereset       = ns87410_pre_reset,
 127};
 128
 129static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 130{
 131        static const struct ata_port_info info = {
 132                .flags = ATA_FLAG_SLAVE_POSS,
 133                .pio_mask = ATA_PIO3,
 134                .port_ops = &ns87410_port_ops
 135        };
 136        const struct ata_port_info *ppi[] = { &info, NULL };
 137        return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
 138}
 139
 140static const struct pci_device_id ns87410[] = {
 141        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 142
 143        { },
 144};
 145
 146static struct pci_driver ns87410_pci_driver = {
 147        .name           = DRV_NAME,
 148        .id_table       = ns87410,
 149        .probe          = ns87410_init_one,
 150        .remove         = ata_pci_remove_one,
 151#ifdef CONFIG_PM_SLEEP
 152        .suspend        = ata_pci_device_suspend,
 153        .resume         = ata_pci_device_resume,
 154#endif
 155};
 156
 157module_pci_driver(ns87410_pci_driver);
 158
 159MODULE_AUTHOR("Alan Cox");
 160MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 161MODULE_LICENSE("GPL");
 162MODULE_DEVICE_TABLE(pci, ns87410);
 163MODULE_VERSION(DRV_VERSION);
 164