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30f9f2fb DN |
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 void __iomem *request_and_map(struct device *dev, | |
34 | const struct resource *res) | |
35 | { | |
36 | void __iomem *ptr; | |
37 | ||
38 | if (!devm_request_mem_region(dev, res->start, resource_size(res), | |
39 | "denali-dt")) { | |
40 | dev_err(dev, "unable to request %s\n", res->name); | |
41 | return NULL; | |
42 | } | |
43 | ||
44 | ptr = devm_ioremap_nocache(dev, res->start, resource_size(res)); | |
6c67050a | 45 | if (!ptr) |
30f9f2fb DN |
46 | dev_err(dev, "ioremap_nocache of %s failed!", res->name); |
47 | ||
48 | return ptr; | |
49 | } | |
50 | ||
51 | static const struct of_device_id denali_nand_dt_ids[] = { | |
52 | { .compatible = "denali,denali-nand-dt" }, | |
53 | { /* sentinel */ } | |
54 | }; | |
55 | ||
56 | MODULE_DEVICE_TABLE(of, denali_nand_dt_ids); | |
57 | ||
58 | static u64 denali_dma_mask; | |
59 | ||
06f25510 | 60 | static int denali_dt_probe(struct platform_device *ofdev) |
30f9f2fb DN |
61 | { |
62 | struct resource *denali_reg, *nand_data; | |
63 | struct denali_dt *dt; | |
64 | struct denali_nand_info *denali; | |
65 | int ret; | |
66 | const struct of_device_id *of_id; | |
67 | ||
68 | of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev); | |
69 | if (of_id) { | |
70 | ofdev->id_entry = of_id->data; | |
71 | } else { | |
72 | pr_err("Failed to find the right device id.\n"); | |
73 | return -ENOMEM; | |
74 | } | |
75 | ||
76 | dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL); | |
77 | if (!dt) | |
78 | return -ENOMEM; | |
79 | denali = &dt->denali; | |
80 | ||
81 | denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg"); | |
82 | nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data"); | |
83 | if (!denali_reg || !nand_data) { | |
84 | dev_err(&ofdev->dev, "resources not completely defined\n"); | |
85 | return -EINVAL; | |
86 | } | |
87 | ||
88 | denali->platform = DT; | |
89 | denali->dev = &ofdev->dev; | |
90 | denali->irq = platform_get_irq(ofdev, 0); | |
91 | if (denali->irq < 0) { | |
92 | dev_err(&ofdev->dev, "no irq defined\n"); | |
2f2ff14c | 93 | return denali->irq; |
30f9f2fb DN |
94 | } |
95 | ||
96 | denali->flash_reg = request_and_map(&ofdev->dev, denali_reg); | |
97 | if (!denali->flash_reg) | |
98 | return -ENOMEM; | |
99 | ||
100 | denali->flash_mem = request_and_map(&ofdev->dev, nand_data); | |
101 | if (!denali->flash_mem) | |
102 | return -ENOMEM; | |
103 | ||
104 | if (!of_property_read_u32(ofdev->dev.of_node, | |
105 | "dma-mask", (u32 *)&denali_dma_mask)) { | |
106 | denali->dev->dma_mask = &denali_dma_mask; | |
107 | } else { | |
108 | denali->dev->dma_mask = NULL; | |
109 | } | |
110 | ||
111 | dt->clk = clk_get(&ofdev->dev, NULL); | |
112 | if (IS_ERR(dt->clk)) { | |
113 | dev_err(&ofdev->dev, "no clk available\n"); | |
114 | return PTR_ERR(dt->clk); | |
115 | } | |
116 | clk_prepare_enable(dt->clk); | |
117 | ||
118 | ret = denali_init(denali); | |
119 | if (ret) | |
120 | goto out_disable_clk; | |
121 | ||
122 | platform_set_drvdata(ofdev, dt); | |
123 | return 0; | |
124 | ||
125 | out_disable_clk: | |
126 | clk_disable_unprepare(dt->clk); | |
127 | clk_put(dt->clk); | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
810b7e06 | 132 | static int denali_dt_remove(struct platform_device *ofdev) |
30f9f2fb DN |
133 | { |
134 | struct denali_dt *dt = platform_get_drvdata(ofdev); | |
135 | ||
136 | denali_remove(&dt->denali); | |
137 | clk_disable(dt->clk); | |
138 | clk_put(dt->clk); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static struct platform_driver denali_dt_driver = { | |
144 | .probe = denali_dt_probe, | |
5153b88c | 145 | .remove = denali_dt_remove, |
30f9f2fb DN |
146 | .driver = { |
147 | .name = "denali-nand-dt", | |
148 | .owner = THIS_MODULE, | |
ef54f873 | 149 | .of_match_table = denali_nand_dt_ids, |
30f9f2fb DN |
150 | }, |
151 | }; | |
152 | ||
82fc812c | 153 | module_platform_driver(denali_dt_driver); |
30f9f2fb DN |
154 | |
155 | MODULE_LICENSE("GPL"); | |
156 | MODULE_AUTHOR("Jamie Iles"); | |
157 | MODULE_DESCRIPTION("DT driver for Denali NAND controller"); |