/* * 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/init.h> #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) { int ret; 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");