Initial import

1 files changed, 208 insertions, 0 deletions

diff --git a/drivers/ata/pata_rb532_cf.c b/drivers/ata/pata_rb532_cf.c
new file mode 100644
index 000000000..6d08446b8
--- /dev/null
+++ b/drivers/ata/pata_rb532_cf.c
@@ -0,0 +1,208 @@
+/*
+ *  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/gfp.h>
+#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;
+	unsigned int	irq;
+};
+
+/* ------------------------------------------------------------------------ */
+
+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)) {
+		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
+		ata_sff_interrupt(info->irq, dev_instance);
+	} else {
+		irq_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_data_xfer		= ata_sff_data_xfer32,
+};
+
+/* ------------------------------------------------------------------------ */
+
+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	= ATA_PIO4;
+
+	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 int rb532_pata_driver_probe(struct platform_device *pdev)
+{
+	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,
+				resource_size(res));
+	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 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;
+}
+
+static struct platform_driver rb532_pata_platform_driver = {
+	.probe		= rb532_pata_driver_probe,
+	.remove		= rb532_pata_driver_remove,
+	.driver	 = {
+		.name   = DRV_NAME,
+	},
+};
+
+#define DRV_INFO DRV_DESC " version " DRV_VERSION
+
+module_platform_driver(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_ALIAS("platform:" DRV_NAME);