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1 | /* | |
2 | * linux/drivers/mtd/nand/cmx270-nand.c | |
3 | * | |
4 | * Copyright (C) 2006 Compulab, Ltd. | |
5 | * Mike Rapoport <mike@compulab.co.il> | |
6 | * | |
7 | * Derived from drivers/mtd/nand/h1910.c | |
8 | * Copyright (C) 2002 Marius Gröger (mag@sysgo.de) | |
9 | * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) | |
10 | * | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | * Overview: | |
17 | * This is a device driver for the NAND flash device found on the | |
18 | * CM-X270 board. | |
19 | */ | |
20 | ||
21 | #include <linux/mtd/rawnand.h> | |
22 | #include <linux/mtd/partitions.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/gpio.h> | |
25 | #include <linux/module.h> | |
26 | ||
27 | #include <asm/io.h> | |
28 | #include <asm/irq.h> | |
29 | #include <asm/mach-types.h> | |
30 | ||
31 | #include <mach/pxa2xx-regs.h> | |
32 | ||
33 | #define GPIO_NAND_CS (11) | |
34 | #define GPIO_NAND_RB (89) | |
35 | ||
36 | /* MTD structure for CM-X270 board */ | |
37 | static struct mtd_info *cmx270_nand_mtd; | |
38 | ||
39 | /* remaped IO address of the device */ | |
40 | static void __iomem *cmx270_nand_io; | |
41 | ||
42 | /* | |
43 | * Define static partitions for flash device | |
44 | */ | |
45 | static const struct mtd_partition partition_info[] = { | |
46 | [0] = { | |
47 | .name = "cmx270-0", | |
48 | .offset = 0, | |
49 | .size = MTDPART_SIZ_FULL | |
50 | } | |
51 | }; | |
52 | #define NUM_PARTITIONS (ARRAY_SIZE(partition_info)) | |
53 | ||
54 | static u_char cmx270_read_byte(struct mtd_info *mtd) | |
55 | { | |
56 | struct nand_chip *this = mtd_to_nand(mtd); | |
57 | ||
58 | return (readl(this->IO_ADDR_R) >> 16); | |
59 | } | |
60 | ||
61 | static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len) | |
62 | { | |
63 | int i; | |
64 | struct nand_chip *this = mtd_to_nand(mtd); | |
65 | ||
66 | for (i=0; i<len; i++) | |
67 | writel((*buf++ << 16), this->IO_ADDR_W); | |
68 | } | |
69 | ||
70 | static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len) | |
71 | { | |
72 | int i; | |
73 | struct nand_chip *this = mtd_to_nand(mtd); | |
74 | ||
75 | for (i=0; i<len; i++) | |
76 | *buf++ = readl(this->IO_ADDR_R) >> 16; | |
77 | } | |
78 | ||
79 | static inline void nand_cs_on(void) | |
80 | { | |
81 | gpio_set_value(GPIO_NAND_CS, 0); | |
82 | } | |
83 | ||
84 | static void nand_cs_off(void) | |
85 | { | |
86 | dsb(); | |
87 | ||
88 | gpio_set_value(GPIO_NAND_CS, 1); | |
89 | } | |
90 | ||
91 | /* | |
92 | * hardware specific access to control-lines | |
93 | */ | |
94 | static void cmx270_hwcontrol(struct mtd_info *mtd, int dat, | |
95 | unsigned int ctrl) | |
96 | { | |
97 | struct nand_chip *this = mtd_to_nand(mtd); | |
98 | unsigned int nandaddr = (unsigned int)this->IO_ADDR_W; | |
99 | ||
100 | dsb(); | |
101 | ||
102 | if (ctrl & NAND_CTRL_CHANGE) { | |
103 | if ( ctrl & NAND_ALE ) | |
104 | nandaddr |= (1 << 3); | |
105 | else | |
106 | nandaddr &= ~(1 << 3); | |
107 | if ( ctrl & NAND_CLE ) | |
108 | nandaddr |= (1 << 2); | |
109 | else | |
110 | nandaddr &= ~(1 << 2); | |
111 | if ( ctrl & NAND_NCE ) | |
112 | nand_cs_on(); | |
113 | else | |
114 | nand_cs_off(); | |
115 | } | |
116 | ||
117 | dsb(); | |
118 | this->IO_ADDR_W = (void __iomem*)nandaddr; | |
119 | if (dat != NAND_CMD_NONE) | |
120 | writel((dat << 16), this->IO_ADDR_W); | |
121 | ||
122 | dsb(); | |
123 | } | |
124 | ||
125 | /* | |
126 | * read device ready pin | |
127 | */ | |
128 | static int cmx270_device_ready(struct mtd_info *mtd) | |
129 | { | |
130 | dsb(); | |
131 | ||
132 | return (gpio_get_value(GPIO_NAND_RB)); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Main initialization routine | |
137 | */ | |
138 | static int __init cmx270_init(void) | |
139 | { | |
140 | struct nand_chip *this; | |
141 | int ret; | |
142 | ||
143 | if (!(machine_is_armcore() && cpu_is_pxa27x())) | |
144 | return -ENODEV; | |
145 | ||
146 | ret = gpio_request(GPIO_NAND_CS, "NAND CS"); | |
147 | if (ret) { | |
148 | pr_warn("CM-X270: failed to request NAND CS gpio\n"); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | gpio_direction_output(GPIO_NAND_CS, 1); | |
153 | ||
154 | ret = gpio_request(GPIO_NAND_RB, "NAND R/B"); | |
155 | if (ret) { | |
156 | pr_warn("CM-X270: failed to request NAND R/B gpio\n"); | |
157 | goto err_gpio_request; | |
158 | } | |
159 | ||
160 | gpio_direction_input(GPIO_NAND_RB); | |
161 | ||
162 | /* Allocate memory for MTD device structure and private data */ | |
163 | this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL); | |
164 | if (!this) { | |
165 | ret = -ENOMEM; | |
166 | goto err_kzalloc; | |
167 | } | |
168 | ||
169 | cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12); | |
170 | if (!cmx270_nand_io) { | |
171 | pr_debug("Unable to ioremap NAND device\n"); | |
172 | ret = -EINVAL; | |
173 | goto err_ioremap; | |
174 | } | |
175 | ||
176 | cmx270_nand_mtd = nand_to_mtd(this); | |
177 | ||
178 | /* Link the private data with the MTD structure */ | |
179 | cmx270_nand_mtd->owner = THIS_MODULE; | |
180 | ||
181 | /* insert callbacks */ | |
182 | this->IO_ADDR_R = cmx270_nand_io; | |
183 | this->IO_ADDR_W = cmx270_nand_io; | |
184 | this->cmd_ctrl = cmx270_hwcontrol; | |
185 | this->dev_ready = cmx270_device_ready; | |
186 | ||
187 | /* 15 us command delay time */ | |
188 | this->chip_delay = 20; | |
189 | this->ecc.mode = NAND_ECC_SOFT; | |
190 | this->ecc.algo = NAND_ECC_HAMMING; | |
191 | ||
192 | /* read/write functions */ | |
193 | this->read_byte = cmx270_read_byte; | |
194 | this->read_buf = cmx270_read_buf; | |
195 | this->write_buf = cmx270_write_buf; | |
196 | ||
197 | /* Scan to find existence of the device */ | |
198 | ret = nand_scan(cmx270_nand_mtd, 1); | |
199 | if (ret) { | |
200 | pr_notice("No NAND device\n"); | |
201 | goto err_scan; | |
202 | } | |
203 | ||
204 | /* Register the partitions */ | |
205 | ret = mtd_device_parse_register(cmx270_nand_mtd, NULL, NULL, | |
206 | partition_info, NUM_PARTITIONS); | |
207 | if (ret) | |
208 | goto err_scan; | |
209 | ||
210 | /* Return happy */ | |
211 | return 0; | |
212 | ||
213 | err_scan: | |
214 | iounmap(cmx270_nand_io); | |
215 | err_ioremap: | |
216 | kfree(this); | |
217 | err_kzalloc: | |
218 | gpio_free(GPIO_NAND_RB); | |
219 | err_gpio_request: | |
220 | gpio_free(GPIO_NAND_CS); | |
221 | ||
222 | return ret; | |
223 | ||
224 | } | |
225 | module_init(cmx270_init); | |
226 | ||
227 | /* | |
228 | * Clean up routine | |
229 | */ | |
230 | static void __exit cmx270_cleanup(void) | |
231 | { | |
232 | /* Release resources, unregister device */ | |
233 | nand_release(cmx270_nand_mtd); | |
234 | ||
235 | gpio_free(GPIO_NAND_RB); | |
236 | gpio_free(GPIO_NAND_CS); | |
237 | ||
238 | iounmap(cmx270_nand_io); | |
239 | ||
240 | kfree(mtd_to_nand(cmx270_nand_mtd)); | |
241 | } | |
242 | module_exit(cmx270_cleanup); | |
243 | ||
244 | MODULE_LICENSE("GPL"); | |
245 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
246 | MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module"); |