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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 | * | |
2f82af08 | 9 | * Copyright 2000 Nicolas Pitre <nico@fluxnic.net> |
2e3c22f5 MF |
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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
2e3c22f5 MF |
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 | ||
5e75e86e | 33 | #define pr_devinit(fmt, args...) ({ static const char __fmt[] = fmt; printk(__fmt, ## args); }) |
2e3c22f5 MF |
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 | }; | |
45 | ||
46 | static void switch_to_flash(struct async_state *state) | |
47 | { | |
48 | local_irq_save(state->irq_flags); | |
49 | ||
50 | gpio_set_value(state->enet_flash_pin, 0); | |
51 | ||
52 | state->save_ambctl0 = bfin_read_EBIU_AMBCTL0(); | |
53 | state->save_ambctl1 = bfin_read_EBIU_AMBCTL1(); | |
54 | bfin_write_EBIU_AMBCTL0(state->flash_ambctl0); | |
55 | bfin_write_EBIU_AMBCTL1(state->flash_ambctl1); | |
56 | SSYNC(); | |
57 | } | |
58 | ||
59 | static void switch_back(struct async_state *state) | |
60 | { | |
61 | bfin_write_EBIU_AMBCTL0(state->save_ambctl0); | |
62 | bfin_write_EBIU_AMBCTL1(state->save_ambctl1); | |
63 | SSYNC(); | |
64 | ||
65 | gpio_set_value(state->enet_flash_pin, 1); | |
66 | ||
67 | local_irq_restore(state->irq_flags); | |
68 | } | |
69 | ||
4335c100 | 70 | static map_word bfin_flash_read(struct map_info *map, unsigned long ofs) |
2e3c22f5 MF |
71 | { |
72 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
73 | uint16_t word; | |
74 | map_word test; | |
75 | ||
76 | switch_to_flash(state); | |
77 | ||
78 | word = readw(map->virt + ofs); | |
79 | ||
80 | switch_back(state); | |
81 | ||
82 | test.x[0] = word; | |
83 | return test; | |
84 | } | |
85 | ||
4335c100 | 86 | static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) |
2e3c22f5 MF |
87 | { |
88 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
89 | ||
90 | switch_to_flash(state); | |
91 | ||
92 | memcpy(to, map->virt + from, len); | |
93 | ||
94 | switch_back(state); | |
95 | } | |
96 | ||
4335c100 | 97 | static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs) |
2e3c22f5 MF |
98 | { |
99 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
100 | uint16_t d; | |
101 | ||
102 | d = d1.x[0]; | |
103 | ||
104 | switch_to_flash(state); | |
105 | ||
106 | writew(d, map->virt + ofs); | |
107 | SSYNC(); | |
108 | ||
109 | switch_back(state); | |
110 | } | |
111 | ||
4335c100 | 112 | static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) |
2e3c22f5 MF |
113 | { |
114 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
115 | ||
116 | switch_to_flash(state); | |
117 | ||
118 | memcpy(map->virt + to, from, len); | |
119 | SSYNC(); | |
120 | ||
121 | switch_back(state); | |
122 | } | |
123 | ||
2e3c22f5 | 124 | static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL }; |
2e3c22f5 | 125 | |
06f25510 | 126 | static int bfin_flash_probe(struct platform_device *pdev) |
2e3c22f5 MF |
127 | { |
128 | int ret; | |
129 | struct physmap_flash_data *pdata = pdev->dev.platform_data; | |
130 | struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
131 | struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
132 | struct async_state *state; | |
133 | ||
134 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
135 | if (!state) | |
136 | return -ENOMEM; | |
137 | ||
138 | state->map.name = DRIVER_NAME; | |
4335c100 MF |
139 | state->map.read = bfin_flash_read; |
140 | state->map.copy_from = bfin_flash_copy_from; | |
141 | state->map.write = bfin_flash_write; | |
142 | state->map.copy_to = bfin_flash_copy_to; | |
2e3c22f5 | 143 | state->map.bankwidth = pdata->width; |
28f65c11 | 144 | state->map.size = resource_size(memory); |
2e3c22f5 MF |
145 | state->map.virt = (void __iomem *)memory->start; |
146 | state->map.phys = memory->start; | |
147 | state->map.map_priv_1 = (unsigned long)state; | |
148 | state->enet_flash_pin = platform_get_irq(pdev, 0); | |
149 | state->flash_ambctl0 = flash_ambctl->start; | |
150 | state->flash_ambctl1 = flash_ambctl->end; | |
151 | ||
152 | if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) { | |
153 | pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin); | |
10715b87 | 154 | kfree(state); |
2e3c22f5 MF |
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); | |
10715b87 MF |
161 | if (!state->mtd) { |
162 | gpio_free(state->enet_flash_pin); | |
163 | kfree(state); | |
2e3c22f5 | 164 | return -ENXIO; |
10715b87 | 165 | } |
2e3c22f5 | 166 | |
42d7fbe2 AB |
167 | mtd_device_parse_register(state->mtd, part_probe_types, NULL, |
168 | pdata->parts, pdata->nr_parts); | |
2e3c22f5 MF |
169 | |
170 | platform_set_drvdata(pdev, state); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
810b7e06 | 175 | static int bfin_flash_remove(struct platform_device *pdev) |
2e3c22f5 MF |
176 | { |
177 | struct async_state *state = platform_get_drvdata(pdev); | |
178 | gpio_free(state->enet_flash_pin); | |
fee88c58 | 179 | mtd_device_unregister(state->mtd); |
2e3c22f5 MF |
180 | map_destroy(state->mtd); |
181 | kfree(state); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static struct platform_driver bfin_flash_driver = { | |
186 | .probe = bfin_flash_probe, | |
5153b88c | 187 | .remove = bfin_flash_remove, |
2e3c22f5 MF |
188 | .driver = { |
189 | .name = DRIVER_NAME, | |
190 | }, | |
191 | }; | |
192 | ||
f99640de | 193 | module_platform_driver(bfin_flash_driver); |
2e3c22f5 MF |
194 | |
195 | MODULE_LICENSE("GPL"); | |
196 | MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank"); |