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/*
* A low-level PATA driver to handle a Compact Flash connected on the
* Mikrotik's RouterBoard 153 board.
*
* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
*
* This file was based on: drivers/ata/pata_ixp4xx_cf.c
* Copyright (C) 2006-07 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* Also was based on the driver for Linux 2.4.xx published by Mikrotik for
* their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
* seems not to have a license.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <scsi/scsi_host.h>
#define DRV_NAME "pata-rb153-cf"
#define DRV_VERSION "0.5.0"
#define DRV_DESC "PATA driver for RouterBOARD 153 Compact Flash"
#define RB153_CF_MAXPORTS 1
#define RB153_CF_IO_DELAY 100
#define RB153_CF_REG_CMD 0x0800
#define RB153_CF_REG_CTRL 0x080E
#define RB153_CF_REG_DATA 0x0C00
struct rb153_cf_info {
void __iomem *iobase;
unsigned int gpio_line;
int frozen;
unsigned int irq;
};
static inline void rb153_pata_finish_io(struct ata_port *ap)
{
struct rb153_cf_info *info = ap->host->private_data;
/* FIXME: Keep previous delay. If this is merely a fence then
* ata_sff_sync might be sufficient. */
ata_sff_dma_pause(ap);
ndelay(RB153_CF_IO_DELAY);
irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
}
static void rb153_pata_exec_command(struct ata_port *ap,
const struct ata_taskfile *tf)
{
writeb(tf->command, ap->ioaddr.command_addr);
rb153_pata_finish_io(ap);
}
static unsigned int rb153_pata_data_xfer(struct ata_device *adev,
unsigned char *buf,
unsigned int buflen,
int write_data)
{
void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr;
unsigned int t;
t = buflen;
if (write_data) {
for (; t > 0; t--, buf++)
writeb(*buf, ioaddr);
} else {
for (; t > 0; t--, buf++)
*buf = readb(ioaddr);
}
rb153_pata_finish_io(adev->link->ap);
return buflen;
}
static void rb153_pata_freeze(struct ata_port *ap)
{
struct rb153_cf_info *info = ap->host->private_data;
info->frozen = 1;
}
static void rb153_pata_thaw(struct ata_port *ap)
{
struct rb153_cf_info *info = ap->host->private_data;
info->frozen = 0;
}
static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
{
struct ata_host *ah = dev_instance;
struct rb153_cf_info *info = ah->private_data;
if (gpio_get_value(info->gpio_line)) {
irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
if (!info->frozen)
ata_sff_interrupt(irq, dev_instance);
} else {
irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
}
return IRQ_HANDLED;
}
static struct ata_port_operations rb153_pata_port_ops = {
.inherits = &ata_sff_port_ops,
.sff_exec_command = rb153_pata_exec_command,
.sff_data_xfer = rb153_pata_data_xfer,
.freeze = rb153_pata_freeze,
.thaw = rb153_pata_thaw,
};
static struct scsi_host_template rb153_pata_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static void rb153_pata_setup_port(struct ata_host *ah)
{
struct rb153_cf_info *info = ah->private_data;
struct ata_port *ap;
ap = ah->ports[0];
ap->ops = &rb153_pata_port_ops;
ap->pio_mask = 0x1f; /* PIO4 */
ap->ioaddr.cmd_addr = info->iobase + RB153_CF_REG_CMD;
ap->ioaddr.ctl_addr = info->iobase + RB153_CF_REG_CTRL;
ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
ata_sff_std_ports(&ap->ioaddr);
ap->ioaddr.data_addr = info->iobase + RB153_CF_REG_DATA;
}
static int rb153_pata_driver_probe(struct platform_device *pdev)
{
unsigned int irq;
int gpio;
struct resource *res;
struct ata_host *ah;
struct rb153_cf_info *info;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no IOMEM resource found\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
dev_err(&pdev->dev, "no IRQ resource found\n");
return -ENOENT;
}
gpio = irq_to_gpio(irq);
if (gpio < 0) {
dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
return -ENOENT;
}
ret = gpio_request(gpio, DRV_NAME);
if (ret) {
dev_err(&pdev->dev, "GPIO request failed\n");
return ret;
}
ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
if (!ah)
return -ENOMEM;
platform_set_drvdata(pdev, ah);
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
ah->private_data = info;
info->gpio_line = gpio;
info->irq = irq;
info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
res->end - res->start + 1);
if (!info->iobase)
return -ENOMEM;
ret = gpio_direction_input(gpio);
if (ret) {
dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
ret);
goto err_free_gpio;
}
rb153_pata_setup_port(ah);
ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
IRQF_TRIGGER_LOW, &rb153_pata_sht);
if (ret)
goto err_free_gpio;
return 0;
err_free_gpio:
gpio_free(gpio);
return ret;
}
static int rb153_pata_driver_remove(struct platform_device *pdev)
{
struct ata_host *ah = platform_get_drvdata(pdev);
struct rb153_cf_info *info = ah->private_data;
ata_host_detach(ah);
gpio_free(info->gpio_line);
return 0;
}
static struct platform_driver rb153_pata_platform_driver = {
.probe = rb153_pata_driver_probe,
.remove = rb153_pata_driver_remove,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
/* ------------------------------------------------------------------------ */
#define DRV_INFO DRV_DESC " version " DRV_VERSION
static int __init rb153_pata_module_init(void)
{
printk(KERN_INFO DRV_INFO "\n");
return platform_driver_register(&rb153_pata_platform_driver);
}
static void __exit rb153_pata_module_exit(void)
{
platform_driver_unregister(&rb153_pata_platform_driver);
}
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL v2");
module_init(rb153_pata_module_init);
module_exit(rb153_pata_module_exit);
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