285 lines
6.8 KiB
C
285 lines
6.8 KiB
C
/*
|
|
* A low-level PATA driver to handle a Compact Flash connected on the
|
|
* Mikrotik's RouterBoard 532 board.
|
|
*
|
|
* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
|
|
* Copyright (C) 2008 Florian Fainelli <florian@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/platform_device.h>
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <linux/libata.h>
|
|
#include <scsi/scsi_host.h>
|
|
|
|
#include <asm/gpio.h>
|
|
|
|
#define DRV_NAME "pata-rb532-cf"
|
|
#define DRV_VERSION "0.1.0"
|
|
#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
|
|
|
|
#define RB500_CF_MAXPORTS 1
|
|
#define RB500_CF_IO_DELAY 400
|
|
|
|
#define RB500_CF_REG_BASE 0x0800
|
|
#define RB500_CF_REG_ERR 0x080D
|
|
#define RB500_CF_REG_CTRL 0x080E
|
|
/* 32bit buffered data register offset */
|
|
#define RB500_CF_REG_DBUF32 0x0C00
|
|
|
|
struct rb532_cf_info {
|
|
void __iomem *iobase;
|
|
unsigned int gpio_line;
|
|
int frozen;
|
|
unsigned int irq;
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static inline void rb532_pata_finish_io(struct ata_port *ap)
|
|
{
|
|
struct ata_host *ah = ap->host;
|
|
struct rb532_cf_info *info = ah->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(RB500_CF_IO_DELAY);
|
|
|
|
set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
|
|
}
|
|
|
|
static void rb532_pata_exec_command(struct ata_port *ap,
|
|
const struct ata_taskfile *tf)
|
|
{
|
|
writeb(tf->command, ap->ioaddr.command_addr);
|
|
rb532_pata_finish_io(ap);
|
|
}
|
|
|
|
static unsigned int rb532_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
|
|
unsigned int buflen, int write_data)
|
|
{
|
|
struct ata_port *ap = adev->link->ap;
|
|
void __iomem *ioaddr = ap->ioaddr.data_addr;
|
|
int retlen = buflen;
|
|
|
|
if (write_data) {
|
|
for (; buflen > 0; buflen--, buf++)
|
|
writeb(*buf, ioaddr);
|
|
} else {
|
|
for (; buflen > 0; buflen--, buf++)
|
|
*buf = readb(ioaddr);
|
|
}
|
|
|
|
rb532_pata_finish_io(adev->link->ap);
|
|
return retlen;
|
|
}
|
|
|
|
static void rb532_pata_freeze(struct ata_port *ap)
|
|
{
|
|
struct rb532_cf_info *info = ap->host->private_data;
|
|
|
|
info->frozen = 1;
|
|
}
|
|
|
|
static void rb532_pata_thaw(struct ata_port *ap)
|
|
{
|
|
struct rb532_cf_info *info = ap->host->private_data;
|
|
|
|
info->frozen = 0;
|
|
}
|
|
|
|
static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
|
|
{
|
|
struct ata_host *ah = dev_instance;
|
|
struct rb532_cf_info *info = ah->private_data;
|
|
|
|
if (gpio_get_value(info->gpio_line)) {
|
|
set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
|
|
if (!info->frozen)
|
|
ata_sff_interrupt(info->irq, dev_instance);
|
|
} else {
|
|
set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct ata_port_operations rb532_pata_port_ops = {
|
|
.inherits = &ata_sff_port_ops,
|
|
.sff_exec_command = rb532_pata_exec_command,
|
|
.sff_data_xfer = rb532_pata_data_xfer,
|
|
.freeze = rb532_pata_freeze,
|
|
.thaw = rb532_pata_thaw,
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static struct scsi_host_template rb532_pata_sht = {
|
|
ATA_PIO_SHT(DRV_NAME),
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
static void rb532_pata_setup_ports(struct ata_host *ah)
|
|
{
|
|
struct rb532_cf_info *info = ah->private_data;
|
|
struct ata_port *ap;
|
|
|
|
ap = ah->ports[0];
|
|
|
|
ap->ops = &rb532_pata_port_ops;
|
|
ap->pio_mask = 0x1f; /* PIO4 */
|
|
ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
|
|
|
|
ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
|
|
ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
|
|
ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
|
|
|
|
ata_sff_std_ports(&ap->ioaddr);
|
|
|
|
ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
|
|
ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
|
|
}
|
|
|
|
static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
|
|
{
|
|
unsigned int irq;
|
|
int gpio;
|
|
struct resource *res;
|
|
struct ata_host *ah;
|
|
struct rb532_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;
|
|
}
|
|
|
|
/* allocate host */
|
|
ah = ata_host_alloc(&pdev->dev, RB500_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;
|
|
}
|
|
|
|
rb532_pata_setup_ports(ah);
|
|
|
|
ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
|
|
IRQF_TRIGGER_LOW, &rb532_pata_sht);
|
|
if (ret)
|
|
goto err_free_gpio;
|
|
|
|
return 0;
|
|
|
|
err_free_gpio:
|
|
gpio_free(gpio);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
|
|
{
|
|
struct ata_host *ah = platform_get_drvdata(pdev);
|
|
struct rb532_cf_info *info = ah->private_data;
|
|
|
|
ata_host_detach(ah);
|
|
gpio_free(info->gpio_line);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|
|
|
|
static struct platform_driver rb532_pata_platform_driver = {
|
|
.probe = rb532_pata_driver_probe,
|
|
.remove = __devexit_p(rb532_pata_driver_remove),
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
#define DRV_INFO DRV_DESC " version " DRV_VERSION
|
|
|
|
static int __init rb532_pata_module_init(void)
|
|
{
|
|
printk(KERN_INFO DRV_INFO "\n");
|
|
|
|
return platform_driver_register(&rb532_pata_platform_driver);
|
|
}
|
|
|
|
static void __exit rb532_pata_module_exit(void)
|
|
{
|
|
platform_driver_unregister(&rb532_pata_platform_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
|
|
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
|
|
MODULE_DESCRIPTION(DRV_DESC);
|
|
MODULE_VERSION(DRV_VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(rb532_pata_module_init);
|
|
module_exit(rb532_pata_module_exit);
|