root/drivers/ata/pata_ns87410.c

DEFINITIONS

1. ns87410_pre_reset
2. ns87410_set_piomode
3. ns87410_qc_issue
4. ns87410_init_one

   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 
  26 static 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 
  50 static 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 
 101 static 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 
 117 static struct scsi_host_template ns87410_sht = {
 118         ATA_PIO_SHT(DRV_NAME),
 119 };
 120 
 121 static 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 
 129 static 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 
 140 static const struct pci_device_id ns87410[] = {
 141         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 142 
 143         { },
 144 };
 145 
 146 static 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 
 157 module_pci_driver(ns87410_pci_driver);
 158 
 159 MODULE_AUTHOR("Alan Cox");
 160 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 161 MODULE_LICENSE("GPL");
 162 MODULE_DEVICE_TABLE(pci, ns87410);
 163 MODULE_VERSION(DRV_VERSION);