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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 | ||
7bf350b7 AB |
33 | #define pr_devinit(fmt, args...) \ |
34 | ({ static const char __fmt[] = fmt; printk(__fmt, ## args); }) | |
2e3c22f5 MF |
35 | |
36 | #define DRIVER_NAME "bfin-async-flash" | |
37 | ||
38 | struct async_state { | |
39 | struct mtd_info *mtd; | |
40 | struct map_info map; | |
41 | int enet_flash_pin; | |
42 | uint32_t flash_ambctl0, flash_ambctl1; | |
43 | uint32_t save_ambctl0, save_ambctl1; | |
44 | unsigned long irq_flags; | |
45 | }; | |
46 | ||
47 | static void switch_to_flash(struct async_state *state) | |
48 | { | |
49 | local_irq_save(state->irq_flags); | |
50 | ||
51 | gpio_set_value(state->enet_flash_pin, 0); | |
52 | ||
53 | state->save_ambctl0 = bfin_read_EBIU_AMBCTL0(); | |
54 | state->save_ambctl1 = bfin_read_EBIU_AMBCTL1(); | |
55 | bfin_write_EBIU_AMBCTL0(state->flash_ambctl0); | |
56 | bfin_write_EBIU_AMBCTL1(state->flash_ambctl1); | |
57 | SSYNC(); | |
58 | } | |
59 | ||
60 | static void switch_back(struct async_state *state) | |
61 | { | |
62 | bfin_write_EBIU_AMBCTL0(state->save_ambctl0); | |
63 | bfin_write_EBIU_AMBCTL1(state->save_ambctl1); | |
64 | SSYNC(); | |
65 | ||
66 | gpio_set_value(state->enet_flash_pin, 1); | |
67 | ||
68 | local_irq_restore(state->irq_flags); | |
69 | } | |
70 | ||
4335c100 | 71 | static map_word bfin_flash_read(struct map_info *map, unsigned long ofs) |
2e3c22f5 MF |
72 | { |
73 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
74 | uint16_t word; | |
75 | map_word test; | |
76 | ||
77 | switch_to_flash(state); | |
78 | ||
79 | word = readw(map->virt + ofs); | |
80 | ||
81 | switch_back(state); | |
82 | ||
83 | test.x[0] = word; | |
84 | return test; | |
85 | } | |
86 | ||
4335c100 | 87 | static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) |
2e3c22f5 MF |
88 | { |
89 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
90 | ||
91 | switch_to_flash(state); | |
92 | ||
93 | memcpy(to, map->virt + from, len); | |
94 | ||
95 | switch_back(state); | |
96 | } | |
97 | ||
4335c100 | 98 | static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs) |
2e3c22f5 MF |
99 | { |
100 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
101 | uint16_t d; | |
102 | ||
103 | d = d1.x[0]; | |
104 | ||
105 | switch_to_flash(state); | |
106 | ||
107 | writew(d, map->virt + ofs); | |
108 | SSYNC(); | |
109 | ||
110 | switch_back(state); | |
111 | } | |
112 | ||
4335c100 | 113 | static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) |
2e3c22f5 MF |
114 | { |
115 | struct async_state *state = (struct async_state *)map->map_priv_1; | |
116 | ||
117 | switch_to_flash(state); | |
118 | ||
119 | memcpy(map->virt + to, from, len); | |
120 | SSYNC(); | |
121 | ||
122 | switch_back(state); | |
123 | } | |
124 | ||
2e3c22f5 | 125 | static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL }; |
2e3c22f5 | 126 | |
06f25510 | 127 | static int bfin_flash_probe(struct platform_device *pdev) |
2e3c22f5 MF |
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; | |
4335c100 MF |
140 | state->map.read = bfin_flash_read; |
141 | state->map.copy_from = bfin_flash_copy_from; | |
142 | state->map.write = bfin_flash_write; | |
143 | state->map.copy_to = bfin_flash_copy_to; | |
2e3c22f5 | 144 | state->map.bankwidth = pdata->width; |
28f65c11 | 145 | state->map.size = resource_size(memory); |
2e3c22f5 MF |
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); | |
10715b87 | 155 | kfree(state); |
2e3c22f5 MF |
156 | return -EBUSY; |
157 | } | |
158 | gpio_direction_output(state->enet_flash_pin, 1); | |
159 | ||
160 | pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8); | |
161 | state->mtd = do_map_probe(memory->name, &state->map); | |
10715b87 MF |
162 | if (!state->mtd) { |
163 | gpio_free(state->enet_flash_pin); | |
164 | kfree(state); | |
2e3c22f5 | 165 | return -ENXIO; |
10715b87 | 166 | } |
2e3c22f5 | 167 | |
42d7fbe2 AB |
168 | mtd_device_parse_register(state->mtd, part_probe_types, NULL, |
169 | pdata->parts, pdata->nr_parts); | |
2e3c22f5 MF |
170 | |
171 | platform_set_drvdata(pdev, state); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
810b7e06 | 176 | static int bfin_flash_remove(struct platform_device *pdev) |
2e3c22f5 MF |
177 | { |
178 | struct async_state *state = platform_get_drvdata(pdev); | |
179 | gpio_free(state->enet_flash_pin); | |
fee88c58 | 180 | mtd_device_unregister(state->mtd); |
2e3c22f5 MF |
181 | map_destroy(state->mtd); |
182 | kfree(state); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static struct platform_driver bfin_flash_driver = { | |
187 | .probe = bfin_flash_probe, | |
5153b88c | 188 | .remove = bfin_flash_remove, |
2e3c22f5 MF |
189 | .driver = { |
190 | .name = DRIVER_NAME, | |
191 | }, | |
192 | }; | |
193 | ||
f99640de | 194 | module_platform_driver(bfin_flash_driver); |
2e3c22f5 MF |
195 | |
196 | MODULE_LICENSE("GPL"); | |
197 | MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank"); |