drivers/ata/pata_rb532_cf.c - kernel/msm-4.9 - Gitiles

 /*
  *  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_CMD	0x0800
 #define RB500_CF_REG_CTRL	0x080E
 #define RB500_CF_REG_DATA	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 void 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;

 	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);
 }

 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_CMD;
 	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_DATA;
 }

 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);
	/*
	* 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_CMD 0x0800
	#define RB500_CF_REG_CTRL 0x080E
	#define RB500_CF_REG_DATA 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 void 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;

	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);
	}

	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_CMD;
	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_DATA;
	}

	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);