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Linux/drivers/mtd/maps/bfin-async-flash.c

  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@fluxnic.net>
 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/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/mtd/mtd.h>
 20 #include <linux/mtd/map.h>
 21 #include <linux/mtd/partitions.h>
 22 #include <linux/mtd/physmap.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/slab.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...) \
 33                 ({ static const char __fmt[] = fmt; printk(__fmt, ## args); })
 34 
 35 #define DRIVER_NAME "bfin-async-flash"
 36 
 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 };
 45 
 46 static void switch_to_flash(struct async_state *state)
 47 {
 48         local_irq_save(state->irq_flags);
 49 
 50         gpio_set_value(state->enet_flash_pin, 0);
 51 
 52         state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
 53         state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
 54         bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
 55         bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
 56         SSYNC();
 57 }
 58 
 59 static void switch_back(struct async_state *state)
 60 {
 61         bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
 62         bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
 63         SSYNC();
 64 
 65         gpio_set_value(state->enet_flash_pin, 1);
 66 
 67         local_irq_restore(state->irq_flags);
 68 }
 69 
 70 static map_word bfin_flash_read(struct map_info *map, unsigned long ofs)
 71 {
 72         struct async_state *state = (struct async_state *)map->map_priv_1;
 73         uint16_t word;
 74         map_word test;
 75 
 76         switch_to_flash(state);
 77 
 78         word = readw(map->virt + ofs);
 79 
 80         switch_back(state);
 81 
 82         test.x[0] = word;
 83         return test;
 84 }
 85 
 86 static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 87 {
 88         struct async_state *state = (struct async_state *)map->map_priv_1;
 89 
 90         switch_to_flash(state);
 91 
 92         memcpy(to, map->virt + from, len);
 93 
 94         switch_back(state);
 95 }
 96 
 97 static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs)
 98 {
 99         struct async_state *state = (struct async_state *)map->map_priv_1;
100         uint16_t d;
101 
102         d = d1.x[0];
103 
104         switch_to_flash(state);
105 
106         writew(d, map->virt + ofs);
107         SSYNC();
108 
109         switch_back(state);
110 }
111 
112 static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
113 {
114         struct async_state *state = (struct async_state *)map->map_priv_1;
115 
116         switch_to_flash(state);
117 
118         memcpy(map->virt + to, from, len);
119         SSYNC();
120 
121         switch_back(state);
122 }
123 
124 static const char * const part_probe_types[] = {
125         "cmdlinepart", "RedBoot", NULL };
126 
127 static int bfin_flash_probe(struct platform_device *pdev)
128 {
129         struct physmap_flash_data *pdata = dev_get_platdata(&pdev->dev);
130         struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
131         struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
132         struct async_state *state;
133 
134         state = kzalloc(sizeof(*state), GFP_KERNEL);
135         if (!state)
136                 return -ENOMEM;
137 
138         state->map.name       = DRIVER_NAME;
139         state->map.read       = bfin_flash_read;
140         state->map.copy_from  = bfin_flash_copy_from;
141         state->map.write      = bfin_flash_write;
142         state->map.copy_to    = bfin_flash_copy_to;
143         state->map.bankwidth  = pdata->width;
144         state->map.size       = resource_size(memory);
145         state->map.virt       = (void __iomem *)memory->start;
146         state->map.phys       = memory->start;
147         state->map.map_priv_1 = (unsigned long)state;
148         state->enet_flash_pin = platform_get_irq(pdev, 0);
149         state->flash_ambctl0  = flash_ambctl->start;
150         state->flash_ambctl1  = flash_ambctl->end;
151 
152         if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
153                 pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
154                 kfree(state);
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                 gpio_free(state->enet_flash_pin);
163                 kfree(state);
164                 return -ENXIO;
165         }
166 
167         mtd_device_parse_register(state->mtd, part_probe_types, NULL,
168                                   pdata->parts, pdata->nr_parts);
169 
170         platform_set_drvdata(pdev, state);
171 
172         return 0;
173 }
174 
175 static int bfin_flash_remove(struct platform_device *pdev)
176 {
177         struct async_state *state = platform_get_drvdata(pdev);
178         gpio_free(state->enet_flash_pin);
179         mtd_device_unregister(state->mtd);
180         map_destroy(state->mtd);
181         kfree(state);
182         return 0;
183 }
184 
185 static struct platform_driver bfin_flash_driver = {
186         .probe          = bfin_flash_probe,
187         .remove         = bfin_flash_remove,
188         .driver         = {
189                 .name   = DRIVER_NAME,
190         },
191 };
192 
193 module_platform_driver(bfin_flash_driver);
194 
195 MODULE_LICENSE("GPL");
196 MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");
197 

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