libata: pata_of_platform: OF-Platform PATA device driver
This driver nicely wraps around pata_platform library functions,
and provides OF platform bus bindings to the PATA devices.
Also add || PPC to the PATA_PLATFORM's "depends on" Kconfig entry,
needed for PA Semi Electra.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/drivers/ata/pata_of_platform.c b/drivers/ata/pata_of_platform.c
new file mode 100644
index 0000000..b7bc4e4
--- /dev/null
+++ b/drivers/ata/pata_of_platform.c
@@ -0,0 +1,104 @@
+/*
+ * OF-platform PATA driver
+ *
+ * Copyright (c) 2007 MontaVista Software, Inc.
+ * Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * 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/of_platform.h>
+#include <linux/pata_platform.h>
+
+static int __devinit pata_of_platform_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ int ret;
+ struct device_node *dn = ofdev->node;
+ struct resource io_res;
+ struct resource ctl_res;
+ struct resource irq_res;
+ unsigned int reg_shift = 0;
+ int pio_mode = 0;
+ int pio_mask;
+ const u32 *prop;
+
+ ret = of_address_to_resource(dn, 0, &io_res);
+ if (ret) {
+ dev_err(&ofdev->dev, "can't get IO address from "
+ "device tree\n");
+ return -EINVAL;
+ }
+
+ ret = of_address_to_resource(dn, 1, &ctl_res);
+ if (ret) {
+ dev_err(&ofdev->dev, "can't get CTL address from "
+ "device tree\n");
+ return -EINVAL;
+ }
+
+ ret = of_irq_to_resource(dn, 0, &irq_res);
+ if (ret == NO_IRQ)
+ irq_res.start = irq_res.end = -1;
+ else
+ irq_res.flags = 0;
+
+ prop = of_get_property(dn, "reg-shift", NULL);
+ if (prop)
+ reg_shift = *prop;
+
+ prop = of_get_property(dn, "pio-mode", NULL);
+ if (prop) {
+ pio_mode = *prop;
+ if (pio_mode > 6) {
+ dev_err(&ofdev->dev, "invalid pio-mode\n");
+ return -EINVAL;
+ }
+ } else {
+ dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
+ }
+
+ pio_mask = 1 << pio_mode;
+ pio_mask |= (1 << pio_mode) - 1;
+
+ return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res,
+ reg_shift, pio_mask);
+}
+
+static int __devexit pata_of_platform_remove(struct of_device *ofdev)
+{
+ return __pata_platform_remove(&ofdev->dev);
+}
+
+static struct of_device_id pata_of_platform_match[] = {
+ { .compatible = "ata-generic", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pata_of_platform_match);
+
+static struct of_platform_driver pata_of_platform_driver = {
+ .name = "pata_of_platform",
+ .match_table = pata_of_platform_match,
+ .probe = pata_of_platform_probe,
+ .remove = __devexit_p(pata_of_platform_remove),
+};
+
+static int __init pata_of_platform_init(void)
+{
+ return of_register_platform_driver(&pata_of_platform_driver);
+}
+module_init(pata_of_platform_init);
+
+static void __exit pata_of_platform_exit(void)
+{
+ of_unregister_platform_driver(&pata_of_platform_driver);
+}
+module_exit(pata_of_platform_exit);
+
+MODULE_DESCRIPTION("OF-platform PATA driver");
+MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
+MODULE_LICENSE("GPL");
