2 * NAND Flash Controller Device Driver for DT
4 * Copyright © 2011, Picochip.
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.
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
15 #include <linux/clk.h>
16 #include <linux/err.h>
18 #include <linux/ioport.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
23 #include <linux/of_device.h>
28 struct denali_nand_info denali;
32 static const struct of_device_id denali_nand_dt_ids[] = {
33 { .compatible = "denali,denali-nand-dt" },
37 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
39 static u64 denali_dma_mask;
41 static int denali_dt_probe(struct platform_device *ofdev)
43 struct resource *denali_reg, *nand_data;
45 struct denali_nand_info *denali;
47 const struct of_device_id *of_id;
49 of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
51 ofdev->id_entry = of_id->data;
53 pr_err("Failed to find the right device id.\n");
57 dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
62 denali->platform = DT;
63 denali->dev = &ofdev->dev;
64 denali->irq = platform_get_irq(ofdev, 0);
65 if (denali->irq < 0) {
66 dev_err(&ofdev->dev, "no irq defined\n");
70 denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
71 denali->flash_reg = devm_ioremap_resource(&ofdev->dev, denali_reg);
72 if (IS_ERR(denali->flash_reg))
73 return PTR_ERR(denali->flash_reg);
75 nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
76 denali->flash_mem = devm_ioremap_resource(&ofdev->dev, nand_data);
77 if (IS_ERR(denali->flash_mem))
78 return PTR_ERR(denali->flash_mem);
80 if (!of_property_read_u32(ofdev->dev.of_node,
81 "dma-mask", (u32 *)&denali_dma_mask)) {
82 denali->dev->dma_mask = &denali_dma_mask;
84 denali->dev->dma_mask = NULL;
87 dt->clk = devm_clk_get(&ofdev->dev, NULL);
88 if (IS_ERR(dt->clk)) {
89 dev_err(&ofdev->dev, "no clk available\n");
90 return PTR_ERR(dt->clk);
92 clk_prepare_enable(dt->clk);
94 ret = denali_init(denali);
98 platform_set_drvdata(ofdev, dt);
102 clk_disable_unprepare(dt->clk);
107 static int denali_dt_remove(struct platform_device *ofdev)
109 struct denali_dt *dt = platform_get_drvdata(ofdev);
111 denali_remove(&dt->denali);
112 clk_disable_unprepare(dt->clk);
117 static struct platform_driver denali_dt_driver = {
118 .probe = denali_dt_probe,
119 .remove = denali_dt_remove,
121 .name = "denali-nand-dt",
122 .of_match_table = denali_nand_dt_ids,
126 module_platform_driver(denali_dt_driver);
128 MODULE_LICENSE("GPL");
129 MODULE_AUTHOR("Jamie Iles");
130 MODULE_DESCRIPTION("DT driver for Denali NAND controller");