Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mtd / nand / denali_dt.c

diff --git a/kernel/drivers/mtd/nand/denali_dt.c b/kernel/drivers/mtd/nand/denali_dt.c
new file mode 100644 (file)
index 0000000..0cb1e8d
--- /dev/null
+++ b/kernel/drivers/mtd/nand/denali_dt.c
@@ -0,0 +1,131 @@
+/*
+ * 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 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 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->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 denali->irq;
+       }
+
+       denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
+       denali->flash_reg = devm_ioremap_resource(&ofdev->dev, denali_reg);
+       if (IS_ERR(denali->flash_reg))
+               return PTR_ERR(denali->flash_reg);
+
+       nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
+       denali->flash_mem = devm_ioremap_resource(&ofdev->dev, nand_data);
+       if (IS_ERR(denali->flash_mem))
+               return PTR_ERR(denali->flash_mem);
+
+       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 = devm_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);
+
+       return ret;
+}
+
+static int denali_dt_remove(struct platform_device *ofdev)
+{
+       struct denali_dt *dt = platform_get_drvdata(ofdev);
+
+       denali_remove(&dt->denali);
+       clk_disable(dt->clk);
+
+       return 0;
+}
+
+static struct platform_driver denali_dt_driver = {
+       .probe          = denali_dt_probe,
+       .remove         = denali_dt_remove,
+       .driver         = {
+               .name   = "denali-nand-dt",
+               .of_match_table = denali_nand_dt_ids,
+       },
+};
+
+module_platform_driver(denali_dt_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamie Iles");
+MODULE_DESCRIPTION("DT driver for Denali NAND controller");