mtd: denali: add a DT driver

Add a device tree version of the Denali NAND driver. Based
on an original patch from Jamie Iles to add a MMIO version
of this driver.

Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 167 insertions, 0 deletions

diff --git a/drivers/mtd/nand/denali_dt.c b/drivers/mtd/nand/denali_dt.c
new file mode 100644
index 000000000000..fbabbaa04374
--- /dev/null
+++ b/drivers/mtd/nand/denali_dt.c
@@ -0,0 +1,167 @@
+/*
+ * NAND Flash Controller Device Driver for DT
+ *
+ * Copyright © 2011, Picochip.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+
+#include "denali.h"
+
+struct denali_dt {
+	struct denali_nand_info	denali;
+	struct clk		*clk;
+};
+
+static void __iomem *request_and_map(struct device *dev,
+				     const struct resource *res)
+{
+	void __iomem *ptr;
+
+	if (!devm_request_mem_region(dev, res->start, resource_size(res),
+				     "denali-dt")) {
+		dev_err(dev, "unable to request %s\n", res->name);
+		return NULL;
+	}
+
+	ptr = devm_ioremap_nocache(dev, res->start, resource_size(res));
+	if (!res)
+		dev_err(dev, "ioremap_nocache of %s failed!", res->name);
+
+	return ptr;
+}
+
+static const struct of_device_id denali_nand_dt_ids[] = {
+		{ .compatible = "denali,denali-nand-dt" },
+		{ /* sentinel */ }
+	};
+
+MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
+
+static u64 denali_dma_mask;
+
+static int __devinit denali_dt_probe(struct platform_device *ofdev)
+{
+	struct resource *denali_reg, *nand_data;
+	struct denali_dt *dt;
+	struct denali_nand_info *denali;
+	int ret;
+	const struct of_device_id *of_id;
+
+	of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
+	if (of_id) {
+		ofdev->id_entry = of_id->data;
+	} else {
+		pr_err("Failed to find the right device id.\n");
+		return -ENOMEM;
+	}
+
+	dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
+	if (!dt)
+		return -ENOMEM;
+	denali = &dt->denali;
+
+	denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
+	nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
+	if (!denali_reg || !nand_data) {
+		dev_err(&ofdev->dev, "resources not completely defined\n");
+		return -EINVAL;
+	}
+
+	denali->platform = DT;
+	denali->dev = &ofdev->dev;
+	denali->irq = platform_get_irq(ofdev, 0);
+	if (denali->irq < 0) {
+		dev_err(&ofdev->dev, "no irq defined\n");
+		return -ENXIO;
+	}
+
+	denali->flash_reg = request_and_map(&ofdev->dev, denali_reg);
+	if (!denali->flash_reg)
+		return -ENOMEM;
+
+	denali->flash_mem = request_and_map(&ofdev->dev, nand_data);
+	if (!denali->flash_mem)
+		return -ENOMEM;
+
+	if (!of_property_read_u32(ofdev->dev.of_node,
+		"dma-mask", (u32 *)&denali_dma_mask)) {
+		denali->dev->dma_mask = &denali_dma_mask;
+	} else {
+		denali->dev->dma_mask = NULL;
+	}
+
+	dt->clk = clk_get(&ofdev->dev, NULL);
+	if (IS_ERR(dt->clk)) {
+		dev_err(&ofdev->dev, "no clk available\n");
+		return PTR_ERR(dt->clk);
+	}
+	clk_prepare_enable(dt->clk);
+
+	ret = denali_init(denali);
+	if (ret)
+		goto out_disable_clk;
+
+	platform_set_drvdata(ofdev, dt);
+	return 0;
+
+out_disable_clk:
+	clk_disable_unprepare(dt->clk);
+	clk_put(dt->clk);
+
+	return ret;
+}
+
+static int __devexit denali_dt_remove(struct platform_device *ofdev)
+{
+	struct denali_dt *dt = platform_get_drvdata(ofdev);
+
+	denali_remove(&dt->denali);
+	clk_disable(dt->clk);
+	clk_put(dt->clk);
+
+	return 0;
+}
+
+static struct platform_driver denali_dt_driver = {
+	.probe		= denali_dt_probe,
+	.remove		= __devexit_p(denali_dt_remove),
+	.driver		= {
+		.name	= "denali-nand-dt",
+		.owner	= THIS_MODULE,
+		.of_match_table	= of_match_ptr(denali_nand_dt_ids),
+	},
+};
+
+static int __init denali_init_dt(void)
+{
+	return platform_driver_register(&denali_dt_driver);
+}
+module_init(denali_init_dt);
+
+static void __exit denali_exit_dt(void)
+{
+	platform_driver_unregister(&denali_dt_driver);
+}
+module_exit(denali_exit_dt);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamie Iles");
+MODULE_DESCRIPTION("DT driver for Denali NAND controller");