+++ /dev/null
-/*
- * drivers/mtd/maps/bfin-async-flash.c
- *
- * Handle the case where flash memory and ethernet mac/phy are
- * mapped onto the same async bank. The BF533-STAMP does this
- * for example. All board-specific configuration goes in your
- * board resources file.
- *
- * Copyright 2000 Nicolas Pitre <nico@fluxnic.net>
- * Copyright 2005-2008 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/map.h>
-#include <linux/mtd/partitions.h>
-#include <linux/mtd/physmap.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-
-#include <asm/blackfin.h>
-#include <linux/gpio.h>
-#include <linux/io.h>
-#include <asm/unaligned.h>
-
-#define pr_devinit(fmt, args...) \
- ({ static const char __fmt[] = fmt; printk(__fmt, ## args); })
-
-#define DRIVER_NAME "bfin-async-flash"
-
-struct async_state {
- struct mtd_info *mtd;
- struct map_info map;
- int enet_flash_pin;
- uint32_t flash_ambctl0, flash_ambctl1;
- uint32_t save_ambctl0, save_ambctl1;
- unsigned long irq_flags;
-};
-
-static void switch_to_flash(struct async_state *state)
-{
- local_irq_save(state->irq_flags);
-
- gpio_set_value(state->enet_flash_pin, 0);
-
- state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
- state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
- bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
- bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
- SSYNC();
-}
-
-static void switch_back(struct async_state *state)
-{
- bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
- bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
- SSYNC();
-
- gpio_set_value(state->enet_flash_pin, 1);
-
- local_irq_restore(state->irq_flags);
-}
-
-static map_word bfin_flash_read(struct map_info *map, unsigned long ofs)
-{
- struct async_state *state = (struct async_state *)map->map_priv_1;
- uint16_t word;
- map_word test;
-
- switch_to_flash(state);
-
- word = readw(map->virt + ofs);
-
- switch_back(state);
-
- test.x[0] = word;
- return test;
-}
-
-static void bfin_flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
-{
- struct async_state *state = (struct async_state *)map->map_priv_1;
-
- switch_to_flash(state);
-
- memcpy(to, map->virt + from, len);
-
- switch_back(state);
-}
-
-static void bfin_flash_write(struct map_info *map, map_word d1, unsigned long ofs)
-{
- struct async_state *state = (struct async_state *)map->map_priv_1;
- uint16_t d;
-
- d = d1.x[0];
-
- switch_to_flash(state);
-
- writew(d, map->virt + ofs);
- SSYNC();
-
- switch_back(state);
-}
-
-static void bfin_flash_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
-{
- struct async_state *state = (struct async_state *)map->map_priv_1;
-
- switch_to_flash(state);
-
- memcpy(map->virt + to, from, len);
- SSYNC();
-
- switch_back(state);
-}
-
-static const char * const part_probe_types[] = {
- "cmdlinepart", "RedBoot", NULL };
-
-static int bfin_flash_probe(struct platform_device *pdev)
-{
- struct physmap_flash_data *pdata = dev_get_platdata(&pdev->dev);
- struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- struct async_state *state;
-
- state = kzalloc(sizeof(*state), GFP_KERNEL);
- if (!state)
- return -ENOMEM;
-
- state->map.name = DRIVER_NAME;
- state->map.read = bfin_flash_read;
- state->map.copy_from = bfin_flash_copy_from;
- state->map.write = bfin_flash_write;
- state->map.copy_to = bfin_flash_copy_to;
- state->map.bankwidth = pdata->width;
- state->map.size = resource_size(memory);
- state->map.virt = (void __iomem *)memory->start;
- state->map.phys = memory->start;
- state->map.map_priv_1 = (unsigned long)state;
- state->enet_flash_pin = platform_get_irq(pdev, 0);
- state->flash_ambctl0 = flash_ambctl->start;
- state->flash_ambctl1 = flash_ambctl->end;
-
- if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
- pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
- kfree(state);
- return -EBUSY;
- }
- gpio_direction_output(state->enet_flash_pin, 1);
-
- pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8);
- state->mtd = do_map_probe(memory->name, &state->map);
- if (!state->mtd) {
- gpio_free(state->enet_flash_pin);
- kfree(state);
- return -ENXIO;
- }
-
- mtd_device_parse_register(state->mtd, part_probe_types, NULL,
- pdata->parts, pdata->nr_parts);
-
- platform_set_drvdata(pdev, state);
-
- return 0;
-}
-
-static int bfin_flash_remove(struct platform_device *pdev)
-{
- struct async_state *state = platform_get_drvdata(pdev);
- gpio_free(state->enet_flash_pin);
- mtd_device_unregister(state->mtd);
- map_destroy(state->mtd);
- kfree(state);
- return 0;
-}
-
-static struct platform_driver bfin_flash_driver = {
- .probe = bfin_flash_probe,
- .remove = bfin_flash_remove,
- .driver = {
- .name = DRIVER_NAME,
- },
-};
-
-module_platform_driver(bfin_flash_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");
projects / linux.git / commitdiff