[libata] Add support for the RB500 PATA CompactFlash

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 314 insertions, 0 deletions

diff --git a/drivers/ata/pata_rb500_cf.c b/drivers/ata/pata_rb500_cf.c
new file mode 100644
index 000000000000..4ce9b03fe6c8
--- /dev/null
+++ b/drivers/ata/pata_rb500_cf.c
@@ -0,0 +1,314 @@
+/*
+ *  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-rb500-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 rb500_cf_info {
+	void __iomem	*iobase;
+	unsigned int	gpio_line;
+	int		frozen;
+	unsigned int	irq;
+};
+
+/* ------------------------------------------------------------------------ */
+
+static inline void rb500_pata_finish_io(struct ata_port *ap)
+{
+	struct ata_host *ah = ap->host;
+	struct rb500_cf_info *info = ah->private_data;
+
+	ata_altstatus(ap);
+	ndelay(RB500_CF_IO_DELAY);
+
+	set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
+}
+
+static void rb500_pata_exec_command(struct ata_port *ap,
+				const struct ata_taskfile *tf)
+{
+	writeb(tf->command, ap->ioaddr.command_addr);
+	rb500_pata_finish_io(ap);
+}
+
+static void rb500_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);
+	}
+
+	rb500_pata_finish_io(adev->link->ap);
+}
+
+static void rb500_pata_freeze(struct ata_port *ap)
+{
+	struct rb500_cf_info *info = ap->host->private_data;
+
+	info->frozen = 1;
+}
+
+static void rb500_pata_thaw(struct ata_port *ap)
+{
+	struct rb500_cf_info *info = ap->host->private_data;
+
+	info->frozen = 0;
+}
+
+static irqreturn_t rb500_pata_irq_handler(int irq, void *dev_instance)
+{
+	struct ata_host *ah = dev_instance;
+	struct rb500_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_interrupt(info->irq, dev_instance);
+	} else {
+		set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void rb500_pata_irq_clear(struct ata_port *ap)
+{
+}
+
+static int rb500_pata_port_start(struct ata_port *ap)
+{
+	return 0;
+}
+
+static struct ata_port_operations rb500_pata_port_ops = {
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+
+	.exec_command		= rb500_pata_exec_command,
+	.check_status 		= ata_check_status,
+	.dev_select 		= ata_std_dev_select,
+
+	.data_xfer		= rb500_pata_data_xfer,
+
+	.qc_prep 		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+
+	.freeze			= rb500_pata_freeze,
+	.thaw			= rb500_pata_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+
+	.irq_handler		= rb500_pata_irq_handler,
+	.irq_clear		= rb500_pata_irq_clear,
+	.irq_on			= ata_irq_on,
+
+	.port_start		= rb500_pata_port_start,
+};
+
+/* ------------------------------------------------------------------------ */
+
+static struct scsi_host_template rb500_pata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+	.proc_name		= DRV_NAME,
+
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+};
+
+/* ------------------------------------------------------------------------ */
+
+static void rb500_pata_setup_ports(struct ata_host *ah)
+{
+	struct rb500_cf_info *info = ah->private_data;
+	struct ata_port *ap;
+
+	ap = ah->ports[0];
+
+	ap->ops		= &rb500_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_std_ports(&ap->ioaddr);
+
+	ap->ioaddr.data_addr	= info->iobase + RB500_CF_REG_DATA;
+}
+
+static __devinit int rb500_pata_driver_probe(struct platform_device *pdev)
+{
+	unsigned int irq;
+	int gpio;
+	struct resource *res;
+	struct ata_host *ah;
+	struct rb500_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;
+	}
+
+	rb500_pata_setup_ports(ah);
+
+	ret = ata_host_activate(ah, irq, rb500_pata_irq_handler,
+				IRQF_TRIGGER_LOW, &rb500_pata_sht);
+	if (ret)
+		goto err_free_gpio;
+
+	return 0;
+
+err_free_gpio:
+	gpio_free(gpio);
+
+	return ret;
+}
+
+static __devexit int rb500_pata_driver_remove(struct platform_device *pdev)
+{
+	struct ata_host *ah = platform_get_drvdata(pdev);
+	struct rb500_cf_info *info = ah->private_data;
+
+	ata_host_detach(ah);
+	gpio_free(info->gpio_line);
+
+	return 0;
+}
+
+static struct platform_driver rb500_pata_platform_driver = {
+	.probe		= rb500_pata_driver_probe,
+	.remove		= __devexit_p(rb500_pata_driver_remove),
+	.driver	 = {
+		.name   = DRV_NAME,
+		.owner  = THIS_MODULE,
+	},
+};
+
+/* ------------------------------------------------------------------------ */
+
+#define DRV_INFO DRV_DESC " version " DRV_VERSION
+
+static int __init rb500_pata_module_init(void)
+{
+	printk(KERN_INFO DRV_INFO "\n");
+
+	return platform_driver_register(&rb500_pata_platform_driver);
+}
+
+static void __exit rb500_pata_module_exit(void)
+{
+	platform_driver_unregister(&rb500_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(rb500_pata_module_init);
+module_exit(rb500_pata_module_exit);