1 /* 2 * Map driver for Intel XScale PXA2xx platforms. 3 * 4 * Author: Nicolas Pitre 5 * Copyright: (C) 2001 MontaVista Software Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/types.h> 14 #include <linux/slab.h> 15 #include <linux/kernel.h> 16 #include <linux/platform_device.h> 17 #include <linux/mtd/mtd.h> 18 #include <linux/mtd/map.h> 19 #include <linux/mtd/partitions.h> 20 21 #include <asm/io.h> 22 #include <mach/hardware.h> 23 24 #include <asm/mach/flash.h> 25 26 #define CACHELINESIZE 32 27 28 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from, 29 ssize_t len) 30 { 31 unsigned long start = (unsigned long)map->cached + from; 32 unsigned long end = start + len; 33 34 start &= ~(CACHELINESIZE - 1); 35 while (start < end) { 36 /* invalidate D cache line */ 37 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)); 38 start += CACHELINESIZE; 39 } 40 } 41 42 struct pxa2xx_flash_info { 43 struct mtd_info *mtd; 44 struct map_info map; 45 }; 46 47 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL }; 48 49 static int pxa2xx_flash_probe(struct platform_device *pdev) 50 { 51 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev); 52 struct pxa2xx_flash_info *info; 53 struct resource *res; 54 55 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 56 if (!res) 57 return -ENODEV; 58 59 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL); 60 if (!info) 61 return -ENOMEM; 62 63 info->map.name = flash->name; 64 info->map.bankwidth = flash->width; 65 info->map.phys = res->start; 66 info->map.size = resource_size(res); 67 68 info->map.virt = ioremap(info->map.phys, info->map.size); 69 if (!info->map.virt) { 70 printk(KERN_WARNING "Failed to ioremap %s\n", 71 info->map.name); 72 return -ENOMEM; 73 } 74 info->map.cached = 75 ioremap_cached(info->map.phys, info->map.size); 76 if (!info->map.cached) 77 printk(KERN_WARNING "Failed to ioremap cached %s\n", 78 info->map.name); 79 info->map.inval_cache = pxa2xx_map_inval_cache; 80 simple_map_init(&info->map); 81 82 printk(KERN_NOTICE 83 "Probing %s at physical address 0x%08lx" 84 " (%d-bit bankwidth)\n", 85 info->map.name, (unsigned long)info->map.phys, 86 info->map.bankwidth * 8); 87 88 info->mtd = do_map_probe(flash->map_name, &info->map); 89 90 if (!info->mtd) { 91 iounmap((void *)info->map.virt); 92 if (info->map.cached) 93 iounmap(info->map.cached); 94 return -EIO; 95 } 96 info->mtd->dev.parent = &pdev->dev; 97 98 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts, 99 flash->nr_parts); 100 101 platform_set_drvdata(pdev, info); 102 return 0; 103 } 104 105 static int pxa2xx_flash_remove(struct platform_device *dev) 106 { 107 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 108 109 mtd_device_unregister(info->mtd); 110 111 map_destroy(info->mtd); 112 iounmap(info->map.virt); 113 if (info->map.cached) 114 iounmap(info->map.cached); 115 kfree(info); 116 return 0; 117 } 118 119 #ifdef CONFIG_PM 120 static void pxa2xx_flash_shutdown(struct platform_device *dev) 121 { 122 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 123 124 if (info && mtd_suspend(info->mtd) == 0) 125 mtd_resume(info->mtd); 126 } 127 #else 128 #define pxa2xx_flash_shutdown NULL 129 #endif 130 131 static struct platform_driver pxa2xx_flash_driver = { 132 .driver = { 133 .name = "pxa2xx-flash", 134 }, 135 .probe = pxa2xx_flash_probe, 136 .remove = pxa2xx_flash_remove, 137 .shutdown = pxa2xx_flash_shutdown, 138 }; 139 140 module_platform_driver(pxa2xx_flash_driver); 141 142 MODULE_LICENSE("GPL"); 143 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>"); 144 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx"); 145