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 const struct of_device_id denali_nand_dt_ids[] = {
34		{ .compatible = "denali,denali-nand-dt" },
35		{ /* sentinel */ }
36	};
37
38MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
39
40static u64 denali_dma_mask;
41
42static int denali_dt_probe(struct platform_device *ofdev)
43{
44	struct resource *denali_reg, *nand_data;
45	struct denali_dt *dt;
46	struct denali_nand_info *denali;
47	int ret;
48	const struct of_device_id *of_id;
49
50	of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
51	if (of_id) {
52		ofdev->id_entry = of_id->data;
53	} else {
54		pr_err("Failed to find the right device id.\n");
55		return -ENOMEM;
56	}
57
58	dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
59	if (!dt)
60		return -ENOMEM;
61	denali = &dt->denali;
62
63	denali->platform = DT;
64	denali->dev = &ofdev->dev;
65	denali->irq = platform_get_irq(ofdev, 0);
66	if (denali->irq < 0) {
67		dev_err(&ofdev->dev, "no irq defined\n");
68		return denali->irq;
69	}
70
71	denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
72	denali->flash_reg = devm_ioremap_resource(&ofdev->dev, denali_reg);
73	if (IS_ERR(denali->flash_reg))
74		return PTR_ERR(denali->flash_reg);
75
76	nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
77	denali->flash_mem = devm_ioremap_resource(&ofdev->dev, nand_data);
78	if (IS_ERR(denali->flash_mem))
79		return PTR_ERR(denali->flash_mem);
80
81	if (!of_property_read_u32(ofdev->dev.of_node,
82		"dma-mask", (u32 *)&denali_dma_mask)) {
83		denali->dev->dma_mask = &denali_dma_mask;
84	} else {
85		denali->dev->dma_mask = NULL;
86	}
87
88	dt->clk = devm_clk_get(&ofdev->dev, NULL);
89	if (IS_ERR(dt->clk)) {
90		dev_err(&ofdev->dev, "no clk available\n");
91		return PTR_ERR(dt->clk);
92	}
93	clk_prepare_enable(dt->clk);
94
95	ret = denali_init(denali);
96	if (ret)
97		goto out_disable_clk;
98
99	platform_set_drvdata(ofdev, dt);
100	return 0;
101
102out_disable_clk:
103	clk_disable_unprepare(dt->clk);
104
105	return ret;
106}
107
108static int denali_dt_remove(struct platform_device *ofdev)
109{
110	struct denali_dt *dt = platform_get_drvdata(ofdev);
111
112	denali_remove(&dt->denali);
113	clk_disable(dt->clk);
114
115	return 0;
116}
117
118static struct platform_driver denali_dt_driver = {
119	.probe		= denali_dt_probe,
120	.remove		= denali_dt_remove,
121	.driver		= {
122		.name	= "denali-nand-dt",
123		.of_match_table	= denali_nand_dt_ids,
124	},
125};
126
127module_platform_driver(denali_dt_driver);
128
129MODULE_LICENSE("GPL");
130MODULE_AUTHOR("Jamie Iles");
131MODULE_DESCRIPTION("DT driver for Denali NAND controller");
132