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/init.h> 17 #include <linux/platform_device.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/mtd/map.h> 20 #include <linux/mtd/partitions.h> 21 22 #include <asm/io.h> 23 #include <mach/hardware.h> 24 25 #include <asm/mach/flash.h> 26 27 #define CACHELINESIZE 32 28 29 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from, 30 ssize_t len) 31 { 32 unsigned long start = (unsigned long)map->cached + from; 33 unsigned long end = start + len; 34 35 start &= ~(CACHELINESIZE - 1); 36 while (start < end) { 37 /* invalidate D cache line */ 38 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)); 39 start += CACHELINESIZE; 40 } 41 } 42 43 struct pxa2xx_flash_info { 44 struct mtd_info *mtd; 45 struct map_info map; 46 }; 47 48 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL }; 49 50 static int pxa2xx_flash_probe(struct platform_device *pdev) 51 { 52 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev); 53 struct pxa2xx_flash_info *info; 54 struct resource *res; 55 56 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 57 if (!res) 58 return -ENODEV; 59 60 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL); 61 if (!info) 62 return -ENOMEM; 63 64 info->map.name = flash->name; 65 info->map.bankwidth = flash->width; 66 info->map.phys = res->start; 67 info->map.size = resource_size(res); 68 69 info->map.virt = ioremap(info->map.phys, info->map.size); 70 if (!info->map.virt) { 71 printk(KERN_WARNING "Failed to ioremap %s\n", 72 info->map.name); 73 return -ENOMEM; 74 } 75 info->map.cached = 76 ioremap_cache(info->map.phys, info->map.size); 77 if (!info->map.cached) 78 printk(KERN_WARNING "Failed to ioremap cached %s\n", 79 info->map.name); 80 info->map.inval_cache = pxa2xx_map_inval_cache; 81 simple_map_init(&info->map); 82 83 printk(KERN_NOTICE 84 "Probing %s at physical address 0x%08lx" 85 " (%d-bit bankwidth)\n", 86 info->map.name, (unsigned long)info->map.phys, 87 info->map.bankwidth * 8); 88 89 info->mtd = do_map_probe(flash->map_name, &info->map); 90 91 if (!info->mtd) { 92 iounmap((void *)info->map.virt); 93 if (info->map.cached) 94 iounmap(info->map.cached); 95 return -EIO; 96 } 97 info->mtd->owner = THIS_MODULE; 98 99 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts, 100 flash->nr_parts); 101 102 platform_set_drvdata(pdev, info); 103 return 0; 104 } 105 106 static int pxa2xx_flash_remove(struct platform_device *dev) 107 { 108 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 109 110 mtd_device_unregister(info->mtd); 111 112 map_destroy(info->mtd); 113 iounmap(info->map.virt); 114 if (info->map.cached) 115 iounmap(info->map.cached); 116 kfree(info); 117 return 0; 118 } 119 120 #ifdef CONFIG_PM 121 static void pxa2xx_flash_shutdown(struct platform_device *dev) 122 { 123 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 124 125 if (info && mtd_suspend(info->mtd) == 0) 126 mtd_resume(info->mtd); 127 } 128 #else 129 #define pxa2xx_flash_shutdown NULL 130 #endif 131 132 static struct platform_driver pxa2xx_flash_driver = { 133 .driver = { 134 .name = "pxa2xx-flash", 135 .owner = THIS_MODULE, 136 }, 137 .probe = pxa2xx_flash_probe, 138 .remove = pxa2xx_flash_remove, 139 .shutdown = pxa2xx_flash_shutdown, 140 }; 141 142 module_platform_driver(pxa2xx_flash_driver); 143 144 MODULE_LICENSE("GPL"); 145 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>"); 146 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx"); 147