--- /dev/null
+/*
+ * A low-level PATA driver to handle a Compact Flash connected on the
+ * Mikrotik's RouterBoard 153 board.
+ *
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@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/io.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+
+#include <linux/libata.h>
+#include <scsi/scsi_host.h>
+
+#define DRV_NAME "pata-rb153-cf"
+#define DRV_VERSION "0.5.0"
+#define DRV_DESC "PATA driver for RouterBOARD 153 Compact Flash"
+
+#define RB153_CF_MAXPORTS 1
+#define RB153_CF_IO_DELAY 100
+
+#define RB153_CF_REG_CMD 0x0800
+#define RB153_CF_REG_CTRL 0x080E
+#define RB153_CF_REG_DATA 0x0C00
+
+struct rb153_cf_info {
+ void __iomem *iobase;
+ unsigned int gpio_line;
+ int frozen;
+ unsigned int irq;
+};
+
+static inline void rb153_pata_finish_io(struct ata_port *ap)
+{
+ struct rb153_cf_info *info = ap->host->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(RB153_CF_IO_DELAY);
+
+ irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
+}
+
+static void rb153_pata_exec_command(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ writeb(tf->command, ap->ioaddr.command_addr);
+ rb153_pata_finish_io(ap);
+}
+
+static unsigned int rb153_pata_data_xfer(struct ata_device *adev,
+ unsigned char *buf,
+ unsigned int buflen,
+ int write_data)
+{
+ void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr;
+ unsigned int t;
+
+ t = buflen;
+ if (write_data) {
+ for (; t > 0; t--, buf++)
+ writeb(*buf, ioaddr);
+ } else {
+ for (; t > 0; t--, buf++)
+ *buf = readb(ioaddr);
+ }
+
+ rb153_pata_finish_io(adev->link->ap);
+ return buflen;
+}
+
+static void rb153_pata_freeze(struct ata_port *ap)
+{
+ struct rb153_cf_info *info = ap->host->private_data;
+
+ info->frozen = 1;
+}
+
+static void rb153_pata_thaw(struct ata_port *ap)
+{
+ struct rb153_cf_info *info = ap->host->private_data;
+
+ info->frozen = 0;
+}
+
+static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
+{
+ struct ata_host *ah = dev_instance;
+ struct rb153_cf_info *info = ah->private_data;
+
+ if (gpio_get_value(info->gpio_line)) {
+ irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
+ if (!info->frozen)
+ ata_sff_interrupt(irq, dev_instance);
+ } else {
+ irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static struct ata_port_operations rb153_pata_port_ops = {
+ .inherits = &ata_sff_port_ops,
+ .sff_exec_command = rb153_pata_exec_command,
+ .sff_data_xfer = rb153_pata_data_xfer,
+ .freeze = rb153_pata_freeze,
+ .thaw = rb153_pata_thaw,
+};
+
+static struct scsi_host_template rb153_pata_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+static void rb153_pata_setup_port(struct ata_host *ah)
+{
+ struct rb153_cf_info *info = ah->private_data;
+ struct ata_port *ap;
+
+ ap = ah->ports[0];
+
+ ap->ops = &rb153_pata_port_ops;
+ ap->pio_mask = 0x1f; /* PIO4 */
+
+ ap->ioaddr.cmd_addr = info->iobase + RB153_CF_REG_CMD;
+ ap->ioaddr.ctl_addr = info->iobase + RB153_CF_REG_CTRL;
+ ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
+
+ ata_sff_std_ports(&ap->ioaddr);
+
+ ap->ioaddr.data_addr = info->iobase + RB153_CF_REG_DATA;
+}
+
+static int rb153_pata_driver_probe(struct platform_device *pdev)
+{
+ unsigned int irq;
+ int gpio;
+ struct resource *res;
+ struct ata_host *ah;
+ struct rb153_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;
+ }
+
+ ah = ata_host_alloc(&pdev->dev, RB153_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;
+ }
+
+ rb153_pata_setup_port(ah);
+
+ ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
+ IRQF_TRIGGER_LOW, &rb153_pata_sht);
+ if (ret)
+ goto err_free_gpio;
+
+ return 0;
+
+err_free_gpio:
+ gpio_free(gpio);
+
+ return ret;
+}
+
+static int rb153_pata_driver_remove(struct platform_device *pdev)
+{
+ struct ata_host *ah = platform_get_drvdata(pdev);
+ struct rb153_cf_info *info = ah->private_data;
+
+ ata_host_detach(ah);
+ gpio_free(info->gpio_line);
+
+ return 0;
+}
+
+static struct platform_driver rb153_pata_platform_driver = {
+ .probe = rb153_pata_driver_probe,
+ .remove = rb153_pata_driver_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+/* ------------------------------------------------------------------------ */
+
+#define DRV_INFO DRV_DESC " version " DRV_VERSION
+
+static int __init rb153_pata_module_init(void)
+{
+ printk(KERN_INFO DRV_INFO "\n");
+
+ return platform_driver_register(&rb153_pata_platform_driver);
+}
+
+static void __exit rb153_pata_module_exit(void)
+{
+ platform_driver_unregister(&rb153_pata_platform_driver);
+}
+
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE("GPL v2");
+
+module_init(rb153_pata_module_init);
+module_exit(rb153_pata_module_exit);
projects / openwrt / svn-archive / archive.git / blobdiff