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
25 #include "denali.h"
26
27 struct denali_dt {
28 struct denali_nand_info denali;
29 struct clk *clk;
30 };
31
32 struct denali_dt_data {
33 unsigned int revision;
34 unsigned int caps;
35 const struct nand_ecc_caps *ecc_caps;
36 };
37
38 NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes,
39 512, 8, 15);
40 static const struct denali_dt_data denali_socfpga_data = {
41 .caps = DENALI_CAP_HW_ECC_FIXUP,
42 .ecc_caps = &denali_socfpga_ecc_caps,
43 };
44
45 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5a_ecc_caps, denali_calc_ecc_bytes,
46 1024, 8, 16, 24);
47 static const struct denali_dt_data denali_uniphier_v5a_data = {
48 .caps = DENALI_CAP_HW_ECC_FIXUP |
49 DENALI_CAP_DMA_64BIT,
50 .ecc_caps = &denali_uniphier_v5a_ecc_caps,
51 };
52
53 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5b_ecc_caps, denali_calc_ecc_bytes,
54 1024, 8, 16);
55 static const struct denali_dt_data denali_uniphier_v5b_data = {
56 .revision = 0x0501,
57 .caps = DENALI_CAP_HW_ECC_FIXUP |
58 DENALI_CAP_DMA_64BIT,
59 .ecc_caps = &denali_uniphier_v5b_ecc_caps,
60 };
61
62 static const struct of_device_id denali_nand_dt_ids[] = {
63 {
64 .compatible = "altr,socfpga-denali-nand",
65 .data = &denali_socfpga_data,
66 },
67 {
68 .compatible = "socionext,uniphier-denali-nand-v5a",
69 .data = &denali_uniphier_v5a_data,
70 },
71 {
72 .compatible = "socionext,uniphier-denali-nand-v5b",
73 .data = &denali_uniphier_v5b_data,
74 },
75 { /* sentinel */ }
76 };
77 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
78
denali_dt_probe(struct platform_device * pdev)79 static int denali_dt_probe(struct platform_device *pdev)
80 {
81 struct resource *res;
82 struct denali_dt *dt;
83 const struct denali_dt_data *data;
84 struct denali_nand_info *denali;
85 int ret;
86
87 dt = devm_kzalloc(&pdev->dev, sizeof(*dt), GFP_KERNEL);
88 if (!dt)
89 return -ENOMEM;
90 denali = &dt->denali;
91
92 data = of_device_get_match_data(&pdev->dev);
93 if (data) {
94 denali->revision = data->revision;
95 denali->caps = data->caps;
96 denali->ecc_caps = data->ecc_caps;
97 }
98
99 denali->dev = &pdev->dev;
100 denali->irq = platform_get_irq(pdev, 0);
101 if (denali->irq < 0) {
102 dev_err(&pdev->dev, "no irq defined\n");
103 return denali->irq;
104 }
105
106 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "denali_reg");
107 denali->reg = devm_ioremap_resource(&pdev->dev, res);
108 if (IS_ERR(denali->reg))
109 return PTR_ERR(denali->reg);
110
111 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
112 denali->host = devm_ioremap_resource(&pdev->dev, res);
113 if (IS_ERR(denali->host))
114 return PTR_ERR(denali->host);
115
116 dt->clk = devm_clk_get(&pdev->dev, NULL);
117 if (IS_ERR(dt->clk)) {
118 dev_err(&pdev->dev, "no clk available\n");
119 return PTR_ERR(dt->clk);
120 }
121 ret = clk_prepare_enable(dt->clk);
122 if (ret)
123 return ret;
124
125 /*
126 * Hardcode the clock rate for the backward compatibility.
127 * This works for both SOCFPGA and UniPhier.
128 */
129 denali->clk_x_rate = 200000000;
130
131 ret = denali_init(denali);
132 if (ret)
133 goto out_disable_clk;
134
135 platform_set_drvdata(pdev, dt);
136 return 0;
137
138 out_disable_clk:
139 clk_disable_unprepare(dt->clk);
140
141 return ret;
142 }
143
denali_dt_remove(struct platform_device * pdev)144 static int denali_dt_remove(struct platform_device *pdev)
145 {
146 struct denali_dt *dt = platform_get_drvdata(pdev);
147
148 denali_remove(&dt->denali);
149 clk_disable_unprepare(dt->clk);
150
151 return 0;
152 }
153
154 static struct platform_driver denali_dt_driver = {
155 .probe = denali_dt_probe,
156 .remove = denali_dt_remove,
157 .driver = {
158 .name = "denali-nand-dt",
159 .of_match_table = denali_nand_dt_ids,
160 },
161 };
162
163 module_platform_driver(denali_dt_driver);
164
165 MODULE_LICENSE("GPL");
166 MODULE_AUTHOR("Jamie Iles");
167 MODULE_DESCRIPTION("DT driver for Denali NAND controller");
168