--- /dev/null
+/*
+ * 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");
projects / karo-tx-linux.git / commitdiff