drivers/ata/pata_palmld.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * drivers/ata/pata_palmld.c
   4  *
   5  * Driver for IDE channel in Palm LifeDrive
   6  *
   7  * Based on research of:
   8  *              Alex Osborne <ato@meshy.org>
   9  *
  10  * Rewrite for mainline:
  11  *              Marek Vasut <marek.vasut@gmail.com>
  12  *
  13  * Rewritten version based on pata_ixp4xx_cf.c:
  14  * ixp4xx PATA/Compact Flash driver
  15  * Copyright (C) 2006-07 Tower Technologies
  16  * Author: Alessandro Zummo <a.zummo@towertech.it>
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/libata.h>
  22 #include <linux/irq.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/delay.h>
  25 #include <linux/gpio/consumer.h>
  26
  27 #include <scsi/scsi_host.h>
  28 #include <mach/palmld.h>
  29
  30 #define DRV_NAME "pata_palmld"
  31
  32 struct palmld_pata {
  33         struct ata_host *host;
  34         struct gpio_desc *power;
  35         struct gpio_desc *reset;
  36 };
  37
  38 static struct scsi_host_template palmld_sht = {
  39         ATA_PIO_SHT(DRV_NAME),
  40 };
  41
  42 static struct ata_port_operations palmld_port_ops = {
  43         .inherits               = &ata_sff_port_ops,
  44         .sff_data_xfer          = ata_sff_data_xfer32,
  45         .cable_detect           = ata_cable_40wire,
  46 };
  47
  48 static int palmld_pata_probe(struct platform_device *pdev)
  49 {
  50         struct palmld_pata *lda;
  51         struct ata_port *ap;
  52         void __iomem *mem;
  53         struct device *dev = &pdev->dev;
  54         int ret;
  55
  56         lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
  57         if (!lda)
  58                 return -ENOMEM;
  59
  60         /* allocate host */
  61         lda->host = ata_host_alloc(dev, 1);
  62         if (!lda->host)
  63                 return -ENOMEM;
  64
  65         /* remap drive's physical memory address */
  66         mem = devm_ioremap(dev, PALMLD_IDE_PHYS, 0x1000);
  67         if (!mem)
  68                 return -ENOMEM;
  69
  70         /* request and activate power and reset GPIOs */
  71         lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
  72         if (IS_ERR(lda->power))
  73                 return PTR_ERR(lda->power);
  74         lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
  75         if (IS_ERR(lda->reset)) {
  76                 gpiod_set_value(lda->power, 0);
  77                 return PTR_ERR(lda->reset);
  78         }
  79
  80         /* Assert reset to reset the drive */
  81         gpiod_set_value(lda->reset, 1);
  82         msleep(30);
  83         gpiod_set_value(lda->reset, 0);
  84         msleep(30);
  85
  86         /* setup the ata port */
  87         ap = lda->host->ports[0];
  88         ap->ops = &palmld_port_ops;
  89         ap->pio_mask = ATA_PIO4;
  90         ap->flags |= ATA_FLAG_PIO_POLLING;
  91
  92         /* memory mapping voodoo */
  93         ap->ioaddr.cmd_addr = mem + 0x10;
  94         ap->ioaddr.altstatus_addr = mem + 0xe;
  95         ap->ioaddr.ctl_addr = mem + 0xe;
  96
  97         /* start the port */
  98         ata_sff_std_ports(&ap->ioaddr);
  99
 100         /* activate host */
 101         ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
 102                                 &palmld_sht);
 103         /* power down on failure */
 104         if (ret) {
 105                 gpiod_set_value(lda->power, 0);
 106                 return ret;
 107         }
 108
 109         platform_set_drvdata(pdev, lda);
 110         return 0;
 111 }
 112
 113 static int palmld_pata_remove(struct platform_device *pdev)
 114 {
 115         struct palmld_pata *lda = platform_get_drvdata(pdev);
 116
 117         ata_platform_remove_one(pdev);
 118
 119         /* power down the HDD */
 120         gpiod_set_value(lda->power, 0);
 121
 122         return 0;
 123 }
 124
 125 static struct platform_driver palmld_pata_platform_driver = {
 126         .driver  = {
 127                 .name   = DRV_NAME,
 128         },
 129         .probe          = palmld_pata_probe,
 130         .remove         = palmld_pata_remove,
 131 };
 132
 133 module_platform_driver(palmld_pata_platform_driver);
 134
 135 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 136 MODULE_DESCRIPTION("PalmLD PATA driver");
 137 MODULE_LICENSE("GPL");
 138 MODULE_ALIAS("platform:" DRV_NAME);