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2e3c22f5 MF |
1 | /* |
2 | * drivers/mtd/maps/bfin-async-flash.c | |
3 | * | |
4 | * Handle the case where flash memory and ethernet mac/phy are | |
5 | * mapped onto the same async bank. The BF533-STAMP does this | |
6 | * for example. All board-specific configuration goes in your | |
7 | * board resources file. | |
8 | * | |
9 | * Copyright 2000 Nicolas Pitre <nico@cam.org> | |
10 | * Copyright 2005-2008 Analog Devices Inc. | |
11 | * | |
12 | * Enter bugs at http://blackfin.uclinux.org/ | |
13 | * | |
14 | * Licensed under the GPL-2 or later. | |
15 | */ | |
16 | ||
17 | #include <linux/init.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mtd/mtd.h> | |
21 | #include <linux/mtd/map.h> | |
22 | #include <linux/mtd/partitions.h> | |
23 | #include <linux/mtd/physmap.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/types.h> | |
26 | ||
27 | #include <asm/blackfin.h> | |
28 | #include <linux/gpio.h> | |
29 | #include <linux/io.h> | |
30 | #include <asm/unaligned.h> | |
31 | ||
32 | #define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); }) | |
33 | ||
34 | #define DRIVER_NAME "bfin-async-flash" | |
35 | ||
36 | struct async_state { | |
37 | struct mtd_info *mtd; | |
38 | struct map_info map; | |
39 | int enet_flash_pin; | |
40 | uint32_t flash_ambctl0, flash_ambctl1; | |
41 | uint32_t save_ambctl0, save_ambctl1; | |
42 | unsigned long irq_flags; | |
43 | }; | |
44 | ||
45 | static void switch_to_flash(struct async_state *state) | |
46 | { | |
47 | local_irq_save(state->irq_flags); | |
48 | ||
49 | gpio_set_value(state->enet_flash_pin, 0); | |
50 | ||
51 | state->save_ambctl0 = bfin_read_EBIU_AMBCTL0(); | |
52 | state->save_ambctl1 = bfin_read_EBIU_AMBCTL1(); | |
53 | bfin_write_EBIU_AMBCTL0(state->flash_ambctl0); | |
54 | bfin_write_EBIU_AMBCTL1(state->flash_ambctl1); | |
55 | SSYNC(); | |
56 | } | |
57 | ||
58 | static void switch_back(struct async_state *state) | |
59 | { | |
60 | bfin_write_EBIU_AMBCTL0(state->save_ambctl0); | |
61 | bfin_write_EBIU_AMBCTL1(state->save_ambctl1); | |
62 | SSYNC(); | |
63 | ||
64 | gpio_set_value(state->enet_flash_pin, 1); | |
65 | ||
66 | local_irq_restore(state->irq_flags); | |
67 | } | |
68 | ||
69 | static map_word bfin_read(struct map_info *map, unsigned long ofs) | |
70 | { | |
71 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
72 | uint16_t word; | |
73 | map_word test; | |
74 | ||
75 | switch_to_flash(state); | |
76 | ||
77 | word = readw(map->virt + ofs); | |
78 | ||
79 | switch_back(state); | |
80 | ||
81 | test.x[0] = word; | |
82 | return test; | |
83 | } | |
84 | ||
85 | static void bfin_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) | |
86 | { | |
87 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
88 | ||
89 | switch_to_flash(state); | |
90 | ||
91 | memcpy(to, map->virt + from, len); | |
92 | ||
93 | switch_back(state); | |
94 | } | |
95 | ||
96 | static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs) | |
97 | { | |
98 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
99 | uint16_t d; | |
100 | ||
101 | d = d1.x[0]; | |
102 | ||
103 | switch_to_flash(state); | |
104 | ||
105 | writew(d, map->virt + ofs); | |
106 | SSYNC(); | |
107 | ||
108 | switch_back(state); | |
109 | } | |
110 | ||
111 | static void bfin_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) | |
112 | { | |
113 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
114 | ||
115 | switch_to_flash(state); | |
116 | ||
117 | memcpy(map->virt + to, from, len); | |
118 | SSYNC(); | |
119 | ||
120 | switch_back(state); | |
121 | } | |
122 | ||
123 | #ifdef CONFIG_MTD_PARTITIONS | |
124 | static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL }; | |
125 | #endif | |
126 | ||
127 | static int __devinit bfin_flash_probe(struct platform_device *pdev) | |
128 | { | |
129 | int ret; | |
130 | struct physmap_flash_data *pdata = pdev->dev.platform_data; | |
131 | struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
132 | struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
133 | struct async_state *state; | |
134 | ||
135 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
136 | if (!state) | |
137 | return -ENOMEM; | |
138 | ||
139 | state->map.name = DRIVER_NAME; | |
140 | state->map.read = bfin_read; | |
141 | state->map.copy_from = bfin_copy_from; | |
142 | state->map.write = bfin_write; | |
143 | state->map.copy_to = bfin_copy_to; | |
144 | state->map.bankwidth = pdata->width; | |
145 | state->map.size = memory->end - memory->start + 1; | |
146 | state->map.virt = (void __iomem *)memory->start; | |
147 | state->map.phys = memory->start; | |
148 | state->map.map_priv_1 = (unsigned long)state; | |
149 | state->enet_flash_pin = platform_get_irq(pdev, 0); | |
150 | state->flash_ambctl0 = flash_ambctl->start; | |
151 | state->flash_ambctl1 = flash_ambctl->end; | |
152 | ||
153 | if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) { | |
154 | pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin); | |
155 | return -EBUSY; | |
156 | } | |
157 | gpio_direction_output(state->enet_flash_pin, 1); | |
158 | ||
159 | pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8); | |
160 | state->mtd = do_map_probe(memory->name, &state->map); | |
161 | if (!state->mtd) | |
162 | return -ENXIO; | |
163 | ||
164 | #ifdef CONFIG_MTD_PARTITIONS | |
165 | ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0); | |
166 | if (ret > 0) { | |
167 | pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n"); | |
168 | add_mtd_partitions(state->mtd, pdata->parts, ret); | |
169 | ||
170 | } else if (pdata->nr_parts) { | |
171 | pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n"); | |
172 | add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts); | |
173 | ||
174 | } else | |
175 | #endif | |
176 | { | |
177 | pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n"); | |
178 | add_mtd_device(state->mtd); | |
179 | } | |
180 | ||
181 | platform_set_drvdata(pdev, state); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int __devexit bfin_flash_remove(struct platform_device *pdev) | |
187 | { | |
188 | struct async_state *state = platform_get_drvdata(pdev); | |
189 | gpio_free(state->enet_flash_pin); | |
190 | #ifdef CONFIG_MTD_PARTITIONS | |
191 | del_mtd_partitions(state->mtd); | |
192 | #endif | |
193 | map_destroy(state->mtd); | |
194 | kfree(state); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static struct platform_driver bfin_flash_driver = { | |
199 | .probe = bfin_flash_probe, | |
200 | .remove = __devexit_p(bfin_flash_remove), | |
201 | .driver = { | |
202 | .name = DRIVER_NAME, | |
203 | }, | |
204 | }; | |
205 | ||
206 | static int __init bfin_flash_init(void) | |
207 | { | |
208 | return platform_driver_register(&bfin_flash_driver); | |
209 | } | |
210 | module_init(bfin_flash_init); | |
211 | ||
212 | static void __exit bfin_flash_exit(void) | |
213 | { | |
214 | platform_driver_unregister(&bfin_flash_driver); | |
215 | } | |
216 | module_exit(bfin_flash_exit); | |
217 | ||
218 | MODULE_LICENSE("GPL"); | |
219 | MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank"); |