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>
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"
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;
49 static void switch_to_flash(struct async_state *state)
51 local_irq_save(state->irq_flags);
53 gpio_set_value(state->enet_flash_pin, 0);
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);
62 static void switch_back(struct async_state *state)
64 bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
65 bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
68 gpio_set_value(state->enet_flash_pin, 1);
70 local_irq_restore(state->irq_flags);
73 static map_word bfin_read(struct map_info *map, unsigned long ofs)
75 struct async_state *state = (struct async_state *)map->map_priv_1;
79 switch_to_flash(state);
81 word = readw(map->virt + ofs);
89 static void bfin_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
91 struct async_state *state = (struct async_state *)map->map_priv_1;
93 switch_to_flash(state);
95 memcpy(to, map->virt + from, len);
100 static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs)
102 struct async_state *state = (struct async_state *)map->map_priv_1;
107 switch_to_flash(state);
109 writew(d, map->virt + ofs);
115 static void bfin_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
117 struct async_state *state = (struct async_state *)map->map_priv_1;
119 switch_to_flash(state);
121 memcpy(map->virt + to, from, len);
127 #ifdef CONFIG_MTD_PARTITIONS
128 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
131 static int __devinit bfin_flash_probe(struct platform_device *pdev)
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;
139 state = kzalloc(sizeof(*state), GFP_KERNEL);
143 state->map.name = DRIVER_NAME;
144 state->map.read = bfin_read;
145 state->map.copy_from = bfin_copy_from;
146 state->map.write = bfin_write;
147 state->map.copy_to = bfin_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;
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);
162 gpio_direction_output(state->enet_flash_pin, 1);
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);
167 gpio_free(state->enet_flash_pin);
172 #ifdef CONFIG_MTD_PARTITIONS
173 ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 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;
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);
186 pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
187 add_mtd_device(state->mtd);
190 platform_set_drvdata(pdev, state);
195 static int __devexit bfin_flash_remove(struct platform_device *pdev)
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);
203 map_destroy(state->mtd);
208 static struct platform_driver bfin_flash_driver = {
209 .probe = bfin_flash_probe,
210 .remove = __devexit_p(bfin_flash_remove),
216 static int __init bfin_flash_init(void)
218 return platform_driver_register(&bfin_flash_driver);
220 module_init(bfin_flash_init);
222 static void __exit bfin_flash_exit(void)
224 platform_driver_unregister(&bfin_flash_driver);
226 module_exit(bfin_flash_exit);
228 MODULE_LICENSE("GPL");
229 MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");