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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@fluxnic.net> | |
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/slab.h> | |
26 | #include <linux/types.h> | |
27 | ||
28 | #include <asm/blackfin.h> | |
29 | #include <linux/gpio.h> | |
30 | #include <linux/io.h> | |
31 | #include <asm/unaligned.h> | |
32 | ||
33 | #define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); }) | |
34 | ||
35 | #define DRIVER_NAME "bfin-async-flash" | |
36 | ||
37 | struct async_state { | |
38 | struct mtd_info *mtd; | |
39 | struct map_info map; | |
40 | int enet_flash_pin; | |
41 | uint32_t flash_ambctl0, flash_ambctl1; | |
42 | uint32_t save_ambctl0, save_ambctl1; | |
43 | unsigned long irq_flags; | |
44 | #ifdef CONFIG_MTD_PARTITIONS | |
45 | struct mtd_partition *parts; | |
46 | #endif | |
47 | }; | |
48 | ||
49 | static void switch_to_flash(struct async_state *state) | |
50 | { | |
51 | local_irq_save(state->irq_flags); | |
52 | ||
53 | gpio_set_value(state->enet_flash_pin, 0); | |
54 | ||
55 | state->save_ambctl0 = bfin_read_EBIU_AMBCTL0(); | |
56 | state->save_ambctl1 = bfin_read_EBIU_AMBCTL1(); | |
57 | bfin_write_EBIU_AMBCTL0(state->flash_ambctl0); | |
58 | bfin_write_EBIU_AMBCTL1(state->flash_ambctl1); | |
59 | SSYNC(); | |
60 | } | |
61 | ||
62 | static void switch_back(struct async_state *state) | |
63 | { | |
64 | bfin_write_EBIU_AMBCTL0(state->save_ambctl0); | |
65 | bfin_write_EBIU_AMBCTL1(state->save_ambctl1); | |
66 | SSYNC(); | |
67 | ||
68 | gpio_set_value(state->enet_flash_pin, 1); | |
69 | ||
70 | local_irq_restore(state->irq_flags); | |
71 | } | |
72 | ||
73 | static map_word bfin_flash_read(struct map_info *map, unsigned long ofs) | |
74 | { | |
75 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
76 | uint16_t word; | |
77 | map_word test; | |
78 | ||
79 | switch_to_flash(state); | |
80 | ||
81 | word = readw(map->virt + ofs); | |
82 | ||
83 | switch_back(state); | |
84 | ||
85 | test.x[0] = word; | |
86 | return test; | |
87 | } | |
88 | ||
89 | static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) | |
90 | { | |
91 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
92 | ||
93 | switch_to_flash(state); | |
94 | ||
95 | memcpy(to, map->virt + from, len); | |
96 | ||
97 | switch_back(state); | |
98 | } | |
99 | ||
100 | static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs) | |
101 | { | |
102 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
103 | uint16_t d; | |
104 | ||
105 | d = d1.x[0]; | |
106 | ||
107 | switch_to_flash(state); | |
108 | ||
109 | writew(d, map->virt + ofs); | |
110 | SSYNC(); | |
111 | ||
112 | switch_back(state); | |
113 | } | |
114 | ||
115 | static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) | |
116 | { | |
117 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
118 | ||
119 | switch_to_flash(state); | |
120 | ||
121 | memcpy(map->virt + to, from, len); | |
122 | SSYNC(); | |
123 | ||
124 | switch_back(state); | |
125 | } | |
126 | ||
127 | #ifdef CONFIG_MTD_PARTITIONS | |
128 | static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL }; | |
129 | #endif | |
130 | ||
131 | static int __devinit bfin_flash_probe(struct platform_device *pdev) | |
132 | { | |
133 | int ret; | |
134 | struct physmap_flash_data *pdata = pdev->dev.platform_data; | |
135 | struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
136 | struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
137 | struct async_state *state; | |
138 | ||
139 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
140 | if (!state) | |
141 | return -ENOMEM; | |
142 | ||
143 | state->map.name = DRIVER_NAME; | |
144 | state->map.read = bfin_flash_read; | |
145 | state->map.copy_from = bfin_flash_copy_from; | |
146 | state->map.write = bfin_flash_write; | |
147 | state->map.copy_to = bfin_flash_copy_to; | |
148 | state->map.bankwidth = pdata->width; | |
149 | state->map.size = memory->end - memory->start + 1; | |
150 | state->map.virt = (void __iomem *)memory->start; | |
151 | state->map.phys = memory->start; | |
152 | state->map.map_priv_1 = (unsigned long)state; | |
153 | state->enet_flash_pin = platform_get_irq(pdev, 0); | |
154 | state->flash_ambctl0 = flash_ambctl->start; | |
155 | state->flash_ambctl1 = flash_ambctl->end; | |
156 | ||
157 | if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) { | |
158 | pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin); | |
159 | kfree(state); | |
160 | return -EBUSY; | |
161 | } | |
162 | gpio_direction_output(state->enet_flash_pin, 1); | |
163 | ||
164 | pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8); | |
165 | state->mtd = do_map_probe(memory->name, &state->map); | |
166 | if (!state->mtd) { | |
167 | gpio_free(state->enet_flash_pin); | |
168 | kfree(state); | |
169 | return -ENXIO; | |
170 | } | |
171 | ||
172 | #ifdef CONFIG_MTD_PARTITIONS | |
173 | ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0); | |
174 | if (ret > 0) { | |
175 | pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n"); | |
176 | add_mtd_partitions(state->mtd, pdata->parts, ret); | |
177 | state->parts = pdata->parts; | |
178 | ||
179 | } else if (pdata->nr_parts) { | |
180 | pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n"); | |
181 | add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts); | |
182 | ||
183 | } else | |
184 | #endif | |
185 | { | |
186 | pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n"); | |
187 | add_mtd_device(state->mtd); | |
188 | } | |
189 | ||
190 | platform_set_drvdata(pdev, state); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static int __devexit bfin_flash_remove(struct platform_device *pdev) | |
196 | { | |
197 | struct async_state *state = platform_get_drvdata(pdev); | |
198 | gpio_free(state->enet_flash_pin); | |
199 | #ifdef CONFIG_MTD_PARTITIONS | |
200 | del_mtd_partitions(state->mtd); | |
201 | kfree(state->parts); | |
202 | #endif | |
203 | map_destroy(state->mtd); | |
204 | kfree(state); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static struct platform_driver bfin_flash_driver = { | |
209 | .probe = bfin_flash_probe, | |
210 | .remove = __devexit_p(bfin_flash_remove), | |
211 | .driver = { | |
212 | .name = DRIVER_NAME, | |
213 | }, | |
214 | }; | |
215 | ||
216 | static int __init bfin_flash_init(void) | |
217 | { | |
218 | return platform_driver_register(&bfin_flash_driver); | |
219 | } | |
220 | module_init(bfin_flash_init); | |
221 | ||
222 | static void __exit bfin_flash_exit(void) | |
223 | { | |
224 | platform_driver_unregister(&bfin_flash_driver); | |
225 | } | |
226 | module_exit(bfin_flash_exit); | |
227 | ||
228 | MODULE_LICENSE("GPL"); | |
229 | MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank"); |