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