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
28 struct denali_dt {
29 struct denali_nand_info denali;
30 struct clk *clk;
31 };
32
33 static const struct of_device_id denali_nand_dt_ids[] = {
34 { .compatible = "denali,denali-nand-dt" },
35 { /* sentinel */ }
36 };
37
38 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
39
40 static u64 denali_dma_mask;
41
denali_dt_probe(struct platform_device * ofdev)42 static 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
102 out_disable_clk:
103 clk_disable_unprepare(dt->clk);
104
105 return ret;
106 }
107
denali_dt_remove(struct platform_device * ofdev)108 static 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
118 static struct platform_driver denali_dt_driver = {
119 .probe = denali_dt_probe,
120 .remove = denali_dt_remove,
121 .driver = {
122 .name = "denali-nand-dt",
123 .owner = THIS_MODULE,
124 .of_match_table = denali_nand_dt_ids,
125 },
126 };
127
128 module_platform_driver(denali_dt_driver);
129
130 MODULE_LICENSE("GPL");
131 MODULE_AUTHOR("Jamie Iles");
132 MODULE_DESCRIPTION("DT driver for Denali NAND controller");
133