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// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/ata/pata_palmld.c
*
* Driver for IDE channel in Palm LifeDrive
*
* Based on research of:
* Alex Osborne <ato@meshy.org>
*
* Rewrite for mainline:
* Marek Vasut <marek.vasut@gmail.com>
*
* Rewritten version based on pata_ixp4xx_cf.c:
* ixp4xx PATA/Compact Flash driver
* Copyright (C) 2006-07 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/libata.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <scsi/scsi_host.h>
#define DRV_NAME "pata_palmld"
struct palmld_pata {
struct ata_host *host;
struct gpio_desc *power;
struct gpio_desc *reset;
};
static struct scsi_host_template palmld_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations palmld_port_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = ata_sff_data_xfer32,
.cable_detect = ata_cable_40wire,
};
static int palmld_pata_probe(struct platform_device *pdev)
{
struct palmld_pata *lda;
struct ata_port *ap;
void __iomem *mem;
struct device *dev = &pdev->dev;
int ret;
lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
if (!lda)
return -ENOMEM;
/* allocate host */
lda->host = ata_host_alloc(dev, 1);
if (!lda->host)
return -ENOMEM;
/* remap drive's physical memory address */
mem = devm_platform_ioremap_resource(pdev, 0);
if (!mem)
return -ENOMEM;
/* request and activate power and reset GPIOs */
lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
if (IS_ERR(lda->power))
return PTR_ERR(lda->power);
lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(lda->reset)) {
gpiod_set_value(lda->power, 0);
return PTR_ERR(lda->reset);
}
/* Assert reset to reset the drive */
gpiod_set_value(lda->reset, 1);
msleep(30);
gpiod_set_value(lda->reset, 0);
msleep(30);
/* setup the ata port */
ap = lda->host->ports[0];
ap->ops = &palmld_port_ops;
ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_PIO_POLLING;
/* memory mapping voodoo */
ap->ioaddr.cmd_addr = mem + 0x10;
ap->ioaddr.altstatus_addr = mem + 0xe;
ap->ioaddr.ctl_addr = mem + 0xe;
/* start the port */
ata_sff_std_ports(&ap->ioaddr);
/* activate host */
ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
&palmld_sht);
/* power down on failure */
if (ret) {
gpiod_set_value(lda->power, 0);
return ret;
}
platform_set_drvdata(pdev, lda);
return 0;
}
static int palmld_pata_remove(struct platform_device *pdev)
{
struct palmld_pata *lda = platform_get_drvdata(pdev);
ata_platform_remove_one(pdev);
/* power down the HDD */
gpiod_set_value(lda->power, 0);
return 0;
}
static struct platform_driver palmld_pata_platform_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = palmld_pata_probe,
.remove = palmld_pata_remove,
};
module_platform_driver(palmld_pata_platform_driver);
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("PalmLD PATA driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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