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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>
27
28#include <asm/blackfin.h>
29#include <linux/gpio.h>
30#include <linux/io.h>
31#include <asm/unaligned.h>
32
33#define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); })
34
35#define DRIVER_NAME "bfin-async-flash"
36
37struct 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#ifdef CONFIG_MTD_PARTITIONS
45 struct mtd_partition *parts;
46#endif
47};
48
49static void switch_to_flash(struct async_state *state)
50{
51 local_irq_save(state->irq_flags);
52
53 gpio_set_value(state->enet_flash_pin, 0);
54
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);
59 SSYNC();
60}
61
62static void switch_back(struct async_state *state)
63{
64 bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
65 bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
66 SSYNC();
67
68 gpio_set_value(state->enet_flash_pin, 1);
69
70 local_irq_restore(state->irq_flags);
71}
72
73static map_word bfin_flash_read(struct map_info *map, unsigned long ofs)
74{
75 struct async_state *state = (struct async_state *)map->map_priv_1;
76 uint16_t word;
77 map_word test;
78
79 switch_to_flash(state);
80
81 word = readw(map->virt + ofs);
82
83 switch_back(state);
84
85 test.x[0] = word;
86 return test;
87}
88
89static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
90{
91 struct async_state *state = (struct async_state *)map->map_priv_1;
92
93 switch_to_flash(state);
94
95 memcpy(to, map->virt + from, len);
96
97 switch_back(state);
98}
99
100static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs)
101{
102 struct async_state *state = (struct async_state *)map->map_priv_1;
103 uint16_t d;
104
105 d = d1.x[0];
106
107 switch_to_flash(state);
108
109 writew(d, map->virt + ofs);
110 SSYNC();
111
112 switch_back(state);
113}
114
115static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
116{
117 struct async_state *state = (struct async_state *)map->map_priv_1;
118
119 switch_to_flash(state);
120
121 memcpy(map->virt + to, from, len);
122 SSYNC();
123
124 switch_back(state);
125}
126
127#ifdef CONFIG_MTD_PARTITIONS
128static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
129#endif
130
131static int __devinit bfin_flash_probe(struct platform_device *pdev)
132{
133 int ret;
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;
138
139 state = kzalloc(sizeof(*state), GFP_KERNEL);
140 if (!state)
141 return -ENOMEM;
142
143 state->map.name = DRIVER_NAME;
144 state->map.read = bfin_flash_read;
145 state->map.copy_from = bfin_flash_copy_from;
146 state->map.write = bfin_flash_write;
147 state->map.copy_to = bfin_flash_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;
156
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);
159 kfree(state);
160 return -EBUSY;
161 }
162 gpio_direction_output(state->enet_flash_pin, 1);
163
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);
166 if (!state->mtd) {
167 gpio_free(state->enet_flash_pin);
168 kfree(state);
169 return -ENXIO;
170 }
171
172#ifdef CONFIG_MTD_PARTITIONS
173 ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
174 if (ret > 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;
178
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);
182
183 } else
184#endif
185 {
186 pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
187 add_mtd_device(state->mtd);
188 }
189
190 platform_set_drvdata(pdev, state);
191
192 return 0;
193}
194
195static int __devexit bfin_flash_remove(struct platform_device *pdev)
196{
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);
201 kfree(state->parts);
202#endif
203 map_destroy(state->mtd);
204 kfree(state);
205 return 0;
206}
207
208static struct platform_driver bfin_flash_driver = {
209 .probe = bfin_flash_probe,
210 .remove = __devexit_p(bfin_flash_remove),
211 .driver = {
212 .name = DRIVER_NAME,
213 },
214};
215
216static int __init bfin_flash_init(void)
217{
218 return platform_driver_register(&bfin_flash_driver);
219}
220module_init(bfin_flash_init);
221
222static void __exit bfin_flash_exit(void)
223{
224 platform_driver_unregister(&bfin_flash_driver);
225}
226module_exit(bfin_flash_exit);
227
228MODULE_LICENSE("GPL");
229MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");
230
