blob: a7c808b577d376a5f99edc98adcf5dd49cc2cba0 [file] [log] [blame]
Mike Frysinger2e3c22f2008-05-19 18:32:24 +08001/*
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 *
Nicolas Pitre2f82af02009-09-14 03:25:28 -04009 * Copyright 2000 Nicolas Pitre <nico@fluxnic.net>
Mike Frysinger2e3c22f2008-05-19 18:32:24 +080010 * 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/types.h>
26
27#include <asm/blackfin.h>
28#include <linux/gpio.h>
29#include <linux/io.h>
30#include <asm/unaligned.h>
31
32#define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); })
33
34#define DRIVER_NAME "bfin-async-flash"
35
36struct async_state {
37 struct mtd_info *mtd;
38 struct map_info map;
39 int enet_flash_pin;
40 uint32_t flash_ambctl0, flash_ambctl1;
41 uint32_t save_ambctl0, save_ambctl1;
42 unsigned long irq_flags;
Mike Frysinger4938c882009-06-02 00:06:23 -040043#ifdef CONFIG_MTD_PARTITIONS
44 struct mtd_partition *parts;
45#endif
Mike Frysinger2e3c22f2008-05-19 18:32:24 +080046};
47
48static void switch_to_flash(struct async_state *state)
49{
50 local_irq_save(state->irq_flags);
51
52 gpio_set_value(state->enet_flash_pin, 0);
53
54 state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
55 state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
56 bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
57 bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
58 SSYNC();
59}
60
61static void switch_back(struct async_state *state)
62{
63 bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
64 bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
65 SSYNC();
66
67 gpio_set_value(state->enet_flash_pin, 1);
68
69 local_irq_restore(state->irq_flags);
70}
71
72static map_word bfin_read(struct map_info *map, unsigned long ofs)
73{
74 struct async_state *state = (struct async_state *)map->map_priv_1;
75 uint16_t word;
76 map_word test;
77
78 switch_to_flash(state);
79
80 word = readw(map->virt + ofs);
81
82 switch_back(state);
83
84 test.x[0] = word;
85 return test;
86}
87
88static void bfin_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
89{
90 struct async_state *state = (struct async_state *)map->map_priv_1;
91
92 switch_to_flash(state);
93
94 memcpy(to, map->virt + from, len);
95
96 switch_back(state);
97}
98
99static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs)
100{
101 struct async_state *state = (struct async_state *)map->map_priv_1;
102 uint16_t d;
103
104 d = d1.x[0];
105
106 switch_to_flash(state);
107
108 writew(d, map->virt + ofs);
109 SSYNC();
110
111 switch_back(state);
112}
113
114static void bfin_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
115{
116 struct async_state *state = (struct async_state *)map->map_priv_1;
117
118 switch_to_flash(state);
119
120 memcpy(map->virt + to, from, len);
121 SSYNC();
122
123 switch_back(state);
124}
125
126#ifdef CONFIG_MTD_PARTITIONS
127static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
128#endif
129
130static int __devinit bfin_flash_probe(struct platform_device *pdev)
131{
132 int ret;
133 struct physmap_flash_data *pdata = pdev->dev.platform_data;
134 struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
135 struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
136 struct async_state *state;
137
138 state = kzalloc(sizeof(*state), GFP_KERNEL);
139 if (!state)
140 return -ENOMEM;
141
142 state->map.name = DRIVER_NAME;
143 state->map.read = bfin_read;
144 state->map.copy_from = bfin_copy_from;
145 state->map.write = bfin_write;
146 state->map.copy_to = bfin_copy_to;
147 state->map.bankwidth = pdata->width;
148 state->map.size = memory->end - memory->start + 1;
149 state->map.virt = (void __iomem *)memory->start;
150 state->map.phys = memory->start;
151 state->map.map_priv_1 = (unsigned long)state;
152 state->enet_flash_pin = platform_get_irq(pdev, 0);
153 state->flash_ambctl0 = flash_ambctl->start;
154 state->flash_ambctl1 = flash_ambctl->end;
155
156 if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
157 pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
Mike Frysinger10715b82009-02-11 13:12:18 -0800158 kfree(state);
Mike Frysinger2e3c22f2008-05-19 18:32:24 +0800159 return -EBUSY;
160 }
161 gpio_direction_output(state->enet_flash_pin, 1);
162
163 pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8);
164 state->mtd = do_map_probe(memory->name, &state->map);
Mike Frysinger10715b82009-02-11 13:12:18 -0800165 if (!state->mtd) {
166 gpio_free(state->enet_flash_pin);
167 kfree(state);
Mike Frysinger2e3c22f2008-05-19 18:32:24 +0800168 return -ENXIO;
Mike Frysinger10715b82009-02-11 13:12:18 -0800169 }
Mike Frysinger2e3c22f2008-05-19 18:32:24 +0800170
171#ifdef CONFIG_MTD_PARTITIONS
172 ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
173 if (ret > 0) {
174 pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n");
175 add_mtd_partitions(state->mtd, pdata->parts, ret);
Mike Frysinger4938c882009-06-02 00:06:23 -0400176 state->parts = pdata->parts;
Mike Frysinger2e3c22f2008-05-19 18:32:24 +0800177
178 } else if (pdata->nr_parts) {
179 pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n");
180 add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts);
181
182 } else
183#endif
184 {
185 pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
186 add_mtd_device(state->mtd);
187 }
188
189 platform_set_drvdata(pdev, state);
190
191 return 0;
192}
193
194static int __devexit bfin_flash_remove(struct platform_device *pdev)
195{
196 struct async_state *state = platform_get_drvdata(pdev);
197 gpio_free(state->enet_flash_pin);
198#ifdef CONFIG_MTD_PARTITIONS
199 del_mtd_partitions(state->mtd);
Mike Frysinger4938c882009-06-02 00:06:23 -0400200 kfree(state->parts);
Mike Frysinger2e3c22f2008-05-19 18:32:24 +0800201#endif
202 map_destroy(state->mtd);
203 kfree(state);
204 return 0;
205}
206
207static struct platform_driver bfin_flash_driver = {
208 .probe = bfin_flash_probe,
209 .remove = __devexit_p(bfin_flash_remove),
210 .driver = {
211 .name = DRIVER_NAME,
212 },
213};
214
215static int __init bfin_flash_init(void)
216{
217 return platform_driver_register(&bfin_flash_driver);
218}
219module_init(bfin_flash_init);
220
221static void __exit bfin_flash_exit(void)
222{
223 platform_driver_unregister(&bfin_flash_driver);
224}
225module_exit(bfin_flash_exit);
226
227MODULE_LICENSE("GPL");
228MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");