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Diffstat (limited to 'drivers/mtd/maps/bfin-async-flash.c')
-rw-r--r--drivers/mtd/maps/bfin-async-flash.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/drivers/mtd/maps/bfin-async-flash.c b/drivers/mtd/maps/bfin-async-flash.c
new file mode 100644
index 000000000000..6fec86aaed7e
--- /dev/null
+++ b/drivers/mtd/maps/bfin-async-flash.c
@@ -0,0 +1,219 @@
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 *
9 * Copyright 2000 Nicolas Pitre <nico@cam.org>
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>
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;
43};
44
45static void switch_to_flash(struct async_state *state)
46{
47 local_irq_save(state->irq_flags);
48
49 gpio_set_value(state->enet_flash_pin, 0);
50
51 state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
52 state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
53 bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
54 bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
55 SSYNC();
56}
57
58static void switch_back(struct async_state *state)
59{
60 bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
61 bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
62 SSYNC();
63
64 gpio_set_value(state->enet_flash_pin, 1);
65
66 local_irq_restore(state->irq_flags);
67}
68
69static map_word bfin_read(struct map_info *map, unsigned long ofs)
70{
71 struct async_state *state = (struct async_state *)map->map_priv_1;
72 uint16_t word;
73 map_word test;
74
75 switch_to_flash(state);
76
77 word = readw(map->virt + ofs);
78
79 switch_back(state);
80
81 test.x[0] = word;
82 return test;
83}
84
85static void bfin_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
86{
87 struct async_state *state = (struct async_state *)map->map_priv_1;
88
89 switch_to_flash(state);
90
91 memcpy(to, map->virt + from, len);
92
93 switch_back(state);
94}
95
96static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs)
97{
98 struct async_state *state = (struct async_state *)map->map_priv_1;
99 uint16_t d;
100
101 d = d1.x[0];
102
103 switch_to_flash(state);
104
105 writew(d, map->virt + ofs);
106 SSYNC();
107
108 switch_back(state);
109}
110
111static void bfin_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
112{
113 struct async_state *state = (struct async_state *)map->map_priv_1;
114
115 switch_to_flash(state);
116
117 memcpy(map->virt + to, from, len);
118 SSYNC();
119
120 switch_back(state);
121}
122
123#ifdef CONFIG_MTD_PARTITIONS
124static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
125#endif
126
127static int __devinit bfin_flash_probe(struct platform_device *pdev)
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;
140 state->map.read = bfin_read;
141 state->map.copy_from = bfin_copy_from;
142 state->map.write = bfin_write;
143 state->map.copy_to = bfin_copy_to;
144 state->map.bankwidth = pdata->width;
145 state->map.size = memory->end - memory->start + 1;
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);
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);
161 if (!state->mtd)
162 return -ENXIO;
163
164#ifdef CONFIG_MTD_PARTITIONS
165 ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
166 if (ret > 0) {
167 pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n");
168 add_mtd_partitions(state->mtd, pdata->parts, ret);
169
170 } else if (pdata->nr_parts) {
171 pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n");
172 add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts);
173
174 } else
175#endif
176 {
177 pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
178 add_mtd_device(state->mtd);
179 }
180
181 platform_set_drvdata(pdev, state);
182
183 return 0;
184}
185
186static int __devexit bfin_flash_remove(struct platform_device *pdev)
187{
188 struct async_state *state = platform_get_drvdata(pdev);
189 gpio_free(state->enet_flash_pin);
190#ifdef CONFIG_MTD_PARTITIONS
191 del_mtd_partitions(state->mtd);
192#endif
193 map_destroy(state->mtd);
194 kfree(state);
195 return 0;
196}
197
198static struct platform_driver bfin_flash_driver = {
199 .probe = bfin_flash_probe,
200 .remove = __devexit_p(bfin_flash_remove),
201 .driver = {
202 .name = DRIVER_NAME,
203 },
204};
205
206static int __init bfin_flash_init(void)
207{
208 return platform_driver_register(&bfin_flash_driver);
209}
210module_init(bfin_flash_init);
211
212static void __exit bfin_flash_exit(void)
213{
214 platform_driver_unregister(&bfin_flash_driver);
215}
216module_exit(bfin_flash_exit);
217
218MODULE_LICENSE("GPL");
219MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");