LXR linux/drivers/mtd/nand/denali

   1/*
   2 * NAND Flash Controller Device Driver for DT
   3 *
   4 * Copyright © 2011, Picochip.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 */
  15#include <linux/clk.h>
  16#include <linux/err.h>
  17#include <linux/io.h>
  18#include <linux/ioport.h>
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/platform_device.h>
  22#include <linux/of.h>
  23#include <linux/of_device.h>
  24#include <linux/slab.h>
  25
  26#include "denali.h"
  27
  28struct denali_dt {
  29        struct denali_nand_info denali;
  30        struct clk              *clk;
  31};
  32
  33static void __iomem *request_and_map(struct device *dev,
  34                                     const struct resource *res)
  35{
  36        void __iomem *ptr;
  37
  38        if (!devm_request_mem_region(dev, res->start, resource_size(res),
  39                                     "denali-dt")) {
  40                dev_err(dev, "unable to request %s\n", res->name);
  41                return NULL;
  42        }
  43
  44        ptr = devm_ioremap_nocache(dev, res->start, resource_size(res));
  45        if (!ptr)
  46                dev_err(dev, "ioremap_nocache of %s failed!", res->name);
  47
  48        return ptr;
  49}
  50
  51static const struct of_device_id denali_nand_dt_ids[] = {
  52                { .compatible = "denali,denali-nand-dt" },
  53                { /* sentinel */ }
  54        };
  55
  56MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
  57
  58static u64 denali_dma_mask;
  59
  60static int denali_dt_probe(struct platform_device *ofdev)
  61{
  62        struct resource *denali_reg, *nand_data;
  63        struct denali_dt *dt;
  64        struct denali_nand_info *denali;
  65        int ret;
  66        const struct of_device_id *of_id;
  67
  68        of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
  69        if (of_id) {
  70                ofdev->id_entry = of_id->data;
  71        } else {
  72                pr_err("Failed to find the right device id.\n");
  73                return -ENOMEM;
  74        }
  75
  76        dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
  77        if (!dt)
  78                return -ENOMEM;
  79        denali = &dt->denali;
  80
  81        denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
  82        nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
  83        if (!denali_reg || !nand_data) {
  84                dev_err(&ofdev->dev, "resources not completely defined\n");
  85                return -EINVAL;
  86        }
  87
  88        denali->platform = DT;
  89        denali->dev = &ofdev->dev;
  90        denali->irq = platform_get_irq(ofdev, 0);
  91        if (denali->irq < 0) {
  92                dev_err(&ofdev->dev, "no irq defined\n");
  93                return denali->irq;
  94        }
  95
  96        denali->flash_reg = request_and_map(&ofdev->dev, denali_reg);
  97        if (!denali->flash_reg)
  98                return -ENOMEM;
  99
 100        denali->flash_mem = request_and_map(&ofdev->dev, nand_data);
 101        if (!denali->flash_mem)
 102                return -ENOMEM;
 103
 104        if (!of_property_read_u32(ofdev->dev.of_node,
 105                "dma-mask", (u32 *)&denali_dma_mask)) {
 106                denali->dev->dma_mask = &denali_dma_mask;
 107        } else {
 108                denali->dev->dma_mask = NULL;
 109        }
 110
 111        dt->clk = clk_get(&ofdev->dev, NULL);
 112        if (IS_ERR(dt->clk)) {
 113                dev_err(&ofdev->dev, "no clk available\n");
 114                return PTR_ERR(dt->clk);
 115        }
 116        clk_prepare_enable(dt->clk);
 117
 118        ret = denali_init(denali);
 119        if (ret)
 120                goto out_disable_clk;
 121
 122        platform_set_drvdata(ofdev, dt);
 123        return 0;
 124
 125out_disable_clk:
 126        clk_disable_unprepare(dt->clk);
 127        clk_put(dt->clk);
 128
 129        return ret;
 130}
 131
 132static int denali_dt_remove(struct platform_device *ofdev)
 133{
 134        struct denali_dt *dt = platform_get_drvdata(ofdev);
 135
 136        denali_remove(&dt->denali);
 137        clk_disable(dt->clk);
 138        clk_put(dt->clk);
 139
 140        return 0;
 141}
 142
 143static struct platform_driver denali_dt_driver = {
 144        .probe          = denali_dt_probe,
 145        .remove         = denali_dt_remove,
 146        .driver         = {
 147                .name   = "denali-nand-dt",
 148                .owner  = THIS_MODULE,
 149                .of_match_table = denali_nand_dt_ids,
 150        },
 151};
 152
 153module_platform_driver(denali_dt_driver);
 154
 155MODULE_LICENSE("GPL");
 156MODULE_AUTHOR("Jamie Iles");
 157MODULE_DESCRIPTION("DT driver for Denali NAND controller");
 158