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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
54d33c4c | 2 | /* |
54d33c4c MR |
3 | * Copyright (C) 2006 Compulab, Ltd. |
4 | * Mike Rapoport <mike@compulab.co.il> | |
5 | * | |
187c5448 | 6 | * Derived from drivers/mtd/nand/h1910.c (removed in v3.10) |
54d33c4c MR |
7 | * Copyright (C) 2002 Marius Gröger (mag@sysgo.de) |
8 | * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) | |
9 | * | |
54d33c4c MR |
10 | * Overview: |
11 | * This is a device driver for the NAND flash device found on the | |
12 | * CM-X270 board. | |
13 | */ | |
14 | ||
d4092d76 | 15 | #include <linux/mtd/rawnand.h> |
54d33c4c | 16 | #include <linux/mtd/partitions.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
70eb33d6 | 18 | #include <linux/gpio.h> |
a0e5cc58 | 19 | #include <linux/module.h> |
54d33c4c MR |
20 | |
21 | #include <asm/io.h> | |
22 | #include <asm/irq.h> | |
70eb33d6 | 23 | #include <asm/mach-types.h> |
54d33c4c | 24 | |
b74d1969 | 25 | #include <mach/pxa2xx-regs.h> |
54d33c4c MR |
26 | |
27 | #define GPIO_NAND_CS (11) | |
28 | #define GPIO_NAND_RB (89) | |
29 | ||
54d33c4c MR |
30 | /* MTD structure for CM-X270 board */ |
31 | static struct mtd_info *cmx270_nand_mtd; | |
32 | ||
33 | /* remaped IO address of the device */ | |
34 | static void __iomem *cmx270_nand_io; | |
35 | ||
36 | /* | |
37 | * Define static partitions for flash device | |
38 | */ | |
d4906688 | 39 | static const struct mtd_partition partition_info[] = { |
54d33c4c MR |
40 | [0] = { |
41 | .name = "cmx270-0", | |
42 | .offset = 0, | |
43 | .size = MTDPART_SIZ_FULL | |
44 | } | |
45 | }; | |
46 | #define NUM_PARTITIONS (ARRAY_SIZE(partition_info)) | |
47 | ||
7e534323 | 48 | static u_char cmx270_read_byte(struct nand_chip *this) |
54d33c4c | 49 | { |
82fc5099 | 50 | return (readl(this->legacy.IO_ADDR_R) >> 16); |
54d33c4c MR |
51 | } |
52 | ||
c0739d85 BB |
53 | static void cmx270_write_buf(struct nand_chip *this, const u_char *buf, |
54 | int len) | |
54d33c4c MR |
55 | { |
56 | int i; | |
54d33c4c MR |
57 | |
58 | for (i=0; i<len; i++) | |
82fc5099 | 59 | writel((*buf++ << 16), this->legacy.IO_ADDR_W); |
54d33c4c MR |
60 | } |
61 | ||
7e534323 | 62 | static void cmx270_read_buf(struct nand_chip *this, u_char *buf, int len) |
54d33c4c MR |
63 | { |
64 | int i; | |
54d33c4c MR |
65 | |
66 | for (i=0; i<len; i++) | |
82fc5099 | 67 | *buf++ = readl(this->legacy.IO_ADDR_R) >> 16; |
54d33c4c MR |
68 | } |
69 | ||
54d33c4c MR |
70 | static inline void nand_cs_on(void) |
71 | { | |
70eb33d6 | 72 | gpio_set_value(GPIO_NAND_CS, 0); |
54d33c4c MR |
73 | } |
74 | ||
75 | static void nand_cs_off(void) | |
76 | { | |
70eb33d6 | 77 | dsb(); |
54d33c4c | 78 | |
70eb33d6 | 79 | gpio_set_value(GPIO_NAND_CS, 1); |
54d33c4c MR |
80 | } |
81 | ||
82 | /* | |
83 | * hardware specific access to control-lines | |
84 | */ | |
0f808c16 | 85 | static void cmx270_hwcontrol(struct nand_chip *this, int dat, |
54d33c4c MR |
86 | unsigned int ctrl) |
87 | { | |
82fc5099 | 88 | unsigned int nandaddr = (unsigned int)this->legacy.IO_ADDR_W; |
54d33c4c | 89 | |
70eb33d6 | 90 | dsb(); |
54d33c4c MR |
91 | |
92 | if (ctrl & NAND_CTRL_CHANGE) { | |
93 | if ( ctrl & NAND_ALE ) | |
94 | nandaddr |= (1 << 3); | |
95 | else | |
96 | nandaddr &= ~(1 << 3); | |
97 | if ( ctrl & NAND_CLE ) | |
98 | nandaddr |= (1 << 2); | |
99 | else | |
100 | nandaddr &= ~(1 << 2); | |
101 | if ( ctrl & NAND_NCE ) | |
102 | nand_cs_on(); | |
103 | else | |
104 | nand_cs_off(); | |
105 | } | |
106 | ||
70eb33d6 | 107 | dsb(); |
82fc5099 | 108 | this->legacy.IO_ADDR_W = (void __iomem*)nandaddr; |
54d33c4c | 109 | if (dat != NAND_CMD_NONE) |
82fc5099 | 110 | writel((dat << 16), this->legacy.IO_ADDR_W); |
54d33c4c | 111 | |
70eb33d6 | 112 | dsb(); |
54d33c4c MR |
113 | } |
114 | ||
115 | /* | |
116 | * read device ready pin | |
117 | */ | |
50a487e7 | 118 | static int cmx270_device_ready(struct nand_chip *this) |
54d33c4c | 119 | { |
70eb33d6 | 120 | dsb(); |
54d33c4c | 121 | |
70eb33d6 | 122 | return (gpio_get_value(GPIO_NAND_RB)); |
54d33c4c MR |
123 | } |
124 | ||
125 | /* | |
126 | * Main initialization routine | |
127 | */ | |
627df23c | 128 | static int __init cmx270_init(void) |
54d33c4c MR |
129 | { |
130 | struct nand_chip *this; | |
54d33c4c MR |
131 | int ret; |
132 | ||
a7f3f030 | 133 | if (!(machine_is_armcore() && cpu_is_pxa27x())) |
70eb33d6 MR |
134 | return -ENODEV; |
135 | ||
136 | ret = gpio_request(GPIO_NAND_CS, "NAND CS"); | |
137 | if (ret) { | |
e8348dc5 | 138 | pr_warn("CM-X270: failed to request NAND CS gpio\n"); |
70eb33d6 MR |
139 | return ret; |
140 | } | |
141 | ||
142 | gpio_direction_output(GPIO_NAND_CS, 1); | |
143 | ||
144 | ret = gpio_request(GPIO_NAND_RB, "NAND R/B"); | |
145 | if (ret) { | |
e8348dc5 | 146 | pr_warn("CM-X270: failed to request NAND R/B gpio\n"); |
70eb33d6 MR |
147 | goto err_gpio_request; |
148 | } | |
149 | ||
150 | gpio_direction_input(GPIO_NAND_RB); | |
151 | ||
54d33c4c | 152 | /* Allocate memory for MTD device structure and private data */ |
2afd14f9 BB |
153 | this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL); |
154 | if (!this) { | |
70eb33d6 MR |
155 | ret = -ENOMEM; |
156 | goto err_kzalloc; | |
54d33c4c MR |
157 | } |
158 | ||
159 | cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12); | |
160 | if (!cmx270_nand_io) { | |
70eb33d6 | 161 | pr_debug("Unable to ioremap NAND device\n"); |
54d33c4c | 162 | ret = -EINVAL; |
70eb33d6 | 163 | goto err_ioremap; |
54d33c4c MR |
164 | } |
165 | ||
2afd14f9 | 166 | cmx270_nand_mtd = nand_to_mtd(this); |
54d33c4c MR |
167 | |
168 | /* Link the private data with the MTD structure */ | |
169 | cmx270_nand_mtd->owner = THIS_MODULE; | |
54d33c4c MR |
170 | |
171 | /* insert callbacks */ | |
82fc5099 BB |
172 | this->legacy.IO_ADDR_R = cmx270_nand_io; |
173 | this->legacy.IO_ADDR_W = cmx270_nand_io; | |
bf6065c6 | 174 | this->legacy.cmd_ctrl = cmx270_hwcontrol; |
8395b753 | 175 | this->legacy.dev_ready = cmx270_device_ready; |
54d33c4c MR |
176 | |
177 | /* 15 us command delay time */ | |
3cece3ab | 178 | this->legacy.chip_delay = 20; |
54d33c4c | 179 | this->ecc.mode = NAND_ECC_SOFT; |
d9944e1f | 180 | this->ecc.algo = NAND_ECC_HAMMING; |
54d33c4c MR |
181 | |
182 | /* read/write functions */ | |
716bbbab BB |
183 | this->legacy.read_byte = cmx270_read_byte; |
184 | this->legacy.read_buf = cmx270_read_buf; | |
185 | this->legacy.write_buf = cmx270_write_buf; | |
54d33c4c MR |
186 | |
187 | /* Scan to find existence of the device */ | |
00ad378f | 188 | ret = nand_scan(this, 1); |
546fe03f | 189 | if (ret) { |
70eb33d6 | 190 | pr_notice("No NAND device\n"); |
70eb33d6 | 191 | goto err_scan; |
54d33c4c MR |
192 | } |
193 | ||
54d33c4c | 194 | /* Register the partitions */ |
29597ca1 RM |
195 | ret = mtd_device_register(cmx270_nand_mtd, partition_info, |
196 | NUM_PARTITIONS); | |
54d33c4c | 197 | if (ret) |
70eb33d6 | 198 | goto err_scan; |
54d33c4c MR |
199 | |
200 | /* Return happy */ | |
201 | return 0; | |
202 | ||
70eb33d6 | 203 | err_scan: |
54d33c4c | 204 | iounmap(cmx270_nand_io); |
70eb33d6 | 205 | err_ioremap: |
2afd14f9 | 206 | kfree(this); |
70eb33d6 MR |
207 | err_kzalloc: |
208 | gpio_free(GPIO_NAND_RB); | |
209 | err_gpio_request: | |
210 | gpio_free(GPIO_NAND_CS); | |
54d33c4c MR |
211 | |
212 | return ret; | |
213 | ||
214 | } | |
215 | module_init(cmx270_init); | |
216 | ||
217 | /* | |
218 | * Clean up routine | |
219 | */ | |
627df23c | 220 | static void __exit cmx270_cleanup(void) |
54d33c4c MR |
221 | { |
222 | /* Release resources, unregister device */ | |
59ac276f | 223 | nand_release(mtd_to_nand(cmx270_nand_mtd)); |
54d33c4c | 224 | |
70eb33d6 MR |
225 | gpio_free(GPIO_NAND_RB); |
226 | gpio_free(GPIO_NAND_CS); | |
227 | ||
54d33c4c MR |
228 | iounmap(cmx270_nand_io); |
229 | ||
2afd14f9 | 230 | kfree(mtd_to_nand(cmx270_nand_mtd)); |
54d33c4c MR |
231 | } |
232 | module_exit(cmx270_cleanup); | |
233 | ||
234 | MODULE_LICENSE("GPL"); | |
235 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
236 | MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module"); |