/* *  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	0x0C00struct 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_VERSIONstatic 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);