include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / mtd / maps / bfin-async-flash.c
blob67815eed2f0039b94a8e86301cf21bc4b88b9df5
1 /*
2 * drivers/mtd/maps/bfin-async-flash.c
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.
9 * Copyright 2000 Nicolas Pitre <nico@fluxnic.net>
10 * Copyright 2005-2008 Analog Devices Inc.
12 * Enter bugs at http://blackfin.uclinux.org/
14 * Licensed under the GPL-2 or later.
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>
28 #include <asm/blackfin.h>
29 #include <linux/gpio.h>
30 #include <linux/io.h>
31 #include <asm/unaligned.h>
33 #define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); })
35 #define DRIVER_NAME "bfin-async-flash"
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 struct mtd_partition *parts;
47 static void switch_to_flash(struct async_state *state)
49 local_irq_save(state->irq_flags);
51 gpio_set_value(state->enet_flash_pin, 0);
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();
60 static void switch_back(struct async_state *state)
62 bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
63 bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
64 SSYNC();
66 gpio_set_value(state->enet_flash_pin, 1);
68 local_irq_restore(state->irq_flags);
71 static map_word bfin_flash_read(struct map_info *map, unsigned long ofs)
73 struct async_state *state = (struct async_state *)map->map_priv_1;
74 uint16_t word;
75 map_word test;
77 switch_to_flash(state);
79 word = readw(map->virt + ofs);
81 switch_back(state);
83 test.x[0] = word;
84 return test;
87 static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
89 struct async_state *state = (struct async_state *)map->map_priv_1;
91 switch_to_flash(state);
93 memcpy(to, map->virt + from, len);
95 switch_back(state);
98 static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs)
100 struct async_state *state = (struct async_state *)map->map_priv_1;
101 uint16_t d;
103 d = d1.x[0];
105 switch_to_flash(state);
107 writew(d, map->virt + ofs);
108 SSYNC();
110 switch_back(state);
113 static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
115 struct async_state *state = (struct async_state *)map->map_priv_1;
117 switch_to_flash(state);
119 memcpy(map->virt + to, from, len);
120 SSYNC();
122 switch_back(state);
125 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
127 static int __devinit bfin_flash_probe(struct platform_device *pdev)
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;
135 state = kzalloc(sizeof(*state), GFP_KERNEL);
136 if (!state)
137 return -ENOMEM;
139 state->map.name = DRIVER_NAME;
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;
144 state->map.bankwidth = pdata->width;
145 state->map.size = resource_size(memory);
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;
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 kfree(state);
156 return -EBUSY;
158 gpio_direction_output(state->enet_flash_pin, 1);
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);
162 if (!state->mtd) {
163 gpio_free(state->enet_flash_pin);
164 kfree(state);
165 return -ENXIO;
168 ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
169 if (ret > 0) {
170 pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n");
171 mtd_device_register(state->mtd, pdata->parts, ret);
172 state->parts = pdata->parts;
173 } else if (pdata->nr_parts) {
174 pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n");
175 mtd_device_register(state->mtd, pdata->parts, pdata->nr_parts);
176 } else {
177 pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
178 mtd_device_register(state->mtd, NULL, 0);
181 platform_set_drvdata(pdev, state);
183 return 0;
186 static int __devexit bfin_flash_remove(struct platform_device *pdev)
188 struct async_state *state = platform_get_drvdata(pdev);
189 gpio_free(state->enet_flash_pin);
190 mtd_device_unregister(state->mtd);
191 kfree(state->parts);
192 map_destroy(state->mtd);
193 kfree(state);
194 return 0;
197 static struct platform_driver bfin_flash_driver = {
198 .probe = bfin_flash_probe,
199 .remove = __devexit_p(bfin_flash_remove),
200 .driver = {
201 .name = DRIVER_NAME,
205 static int __init bfin_flash_init(void)
207 return platform_driver_register(&bfin_flash_driver);
209 module_init(bfin_flash_init);
211 static void __exit bfin_flash_exit(void)
213 platform_driver_unregister(&bfin_flash_driver);
215 module_exit(bfin_flash_exit);
217 MODULE_LICENSE("GPL");
218 MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");