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Diffstat (limited to 'drivers/ata/pata_of_platform.c')
-rw-r--r--drivers/ata/pata_of_platform.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/ata/pata_of_platform.c b/drivers/ata/pata_of_platform.c
new file mode 100644
index 000000000..ac5a633c0
--- /dev/null
+++ b/drivers/ata/pata_of_platform.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * OF-platform PATA driver
+ *
+ * Copyright (c) 2007 MontaVista Software, Inc.
+ * Anton Vorontsov <avorontsov@ru.mvista.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/ata_platform.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_of_platform"
+
+static struct scsi_host_template pata_platform_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+static int pata_of_platform_probe(struct platform_device *ofdev)
+{
+ int ret;
+ struct device_node *dn = ofdev->dev.of_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;
+ bool use16bit;
+ int irq;
+
+ 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;
+ }
+
+ memset(&irq_res, 0, sizeof(irq_res));
+
+ irq = platform_get_irq_optional(ofdev, 0);
+ if (irq < 0 && irq != -ENXIO)
+ return irq;
+ if (irq > 0) {
+ irq_res.start = irq;
+ irq_res.end = irq;
+ }
+
+ of_property_read_u32(dn, "reg-shift", &reg_shift);
+
+ if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
+ 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");
+ }
+
+ use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
+
+ pio_mask = 1 << pio_mode;
+ pio_mask |= (1 << pio_mode) - 1;
+
+ return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq > 0 ? &irq_res : NULL,
+ reg_shift, pio_mask, &pata_platform_sht,
+ use16bit);
+}
+
+static const struct of_device_id pata_of_platform_match[] = {
+ { .compatible = "ata-generic", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pata_of_platform_match);
+
+static struct platform_driver pata_of_platform_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = pata_of_platform_match,
+ },
+ .probe = pata_of_platform_probe,
+ .remove = ata_platform_remove_one,
+};
+
+module_platform_driver(pata_of_platform_driver);
+
+MODULE_DESCRIPTION("OF-platform PATA driver");
+MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
+MODULE_LICENSE("GPL");