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_partition *parts; 45 int nr_parts; 46 struct mtd_info *mtd; 47 struct map_info map; 48 }; 49 50 51 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL }; 52 53 54 static int __devinit pxa2xx_flash_probe(struct platform_device *pdev) 55 { 56 struct flash_platform_data *flash = pdev->dev.platform_data; 57 struct pxa2xx_flash_info *info; 58 struct mtd_partition *parts; 59 struct resource *res; 60 int ret = 0; 61 62 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 63 if (!res) 64 return -ENODEV; 65 66 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL); 67 if (!info) 68 return -ENOMEM; 69 70 info->map.name = (char *) flash->name; 71 info->map.bankwidth = flash->width; 72 info->map.phys = res->start; 73 info->map.size = resource_size(res); 74 info->parts = flash->parts; 75 info->nr_parts = flash->nr_parts; 76 77 info->map.virt = ioremap(info->map.phys, info->map.size); 78 if (!info->map.virt) { 79 printk(KERN_WARNING "Failed to ioremap %s\n", 80 info->map.name); 81 return -ENOMEM; 82 } 83 info->map.cached = 84 ioremap_cached(info->map.phys, info->map.size); 85 if (!info->map.cached) 86 printk(KERN_WARNING "Failed to ioremap cached %s\n", 87 info->map.name); 88 info->map.inval_cache = pxa2xx_map_inval_cache; 89 simple_map_init(&info->map); 90 91 printk(KERN_NOTICE 92 "Probing %s at physical address 0x%08lx" 93 " (%d-bit bankwidth)\n", 94 info->map.name, (unsigned long)info->map.phys, 95 info->map.bankwidth * 8); 96 97 info->mtd = do_map_probe(flash->map_name, &info->map); 98 99 if (!info->mtd) { 100 iounmap((void *)info->map.virt); 101 if (info->map.cached) 102 iounmap(info->map.cached); 103 return -EIO; 104 } 105 info->mtd->owner = THIS_MODULE; 106 107 ret = parse_mtd_partitions(info->mtd, probes, &parts, 0); 108 109 if (ret > 0) { 110 info->nr_parts = ret; 111 info->parts = parts; 112 } 113 114 if (!info->nr_parts) 115 printk("Registering %s as whole device\n", 116 info->map.name); 117 118 mtd_device_register(info->mtd, info->parts, info->nr_parts); 119 120 platform_set_drvdata(pdev, info); 121 return 0; 122 } 123 124 static int __devexit pxa2xx_flash_remove(struct platform_device *dev) 125 { 126 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 127 128 platform_set_drvdata(dev, NULL); 129 130 mtd_device_unregister(info->mtd); 131 132 map_destroy(info->mtd); 133 iounmap(info->map.virt); 134 if (info->map.cached) 135 iounmap(info->map.cached); 136 kfree(info->parts); 137 kfree(info); 138 return 0; 139 } 140 141 #ifdef CONFIG_PM 142 static void pxa2xx_flash_shutdown(struct platform_device *dev) 143 { 144 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 145 146 if (info && info->mtd->suspend(info->mtd) == 0) 147 info->mtd->resume(info->mtd); 148 } 149 #else 150 #define pxa2xx_flash_shutdown NULL 151 #endif 152 153 static struct platform_driver pxa2xx_flash_driver = { 154 .driver = { 155 .name = "pxa2xx-flash", 156 .owner = THIS_MODULE, 157 }, 158 .probe = pxa2xx_flash_probe, 159 .remove = __devexit_p(pxa2xx_flash_remove), 160 .shutdown = pxa2xx_flash_shutdown, 161 }; 162 163 static int __init init_pxa2xx_flash(void) 164 { 165 return platform_driver_register(&pxa2xx_flash_driver); 166 } 167 168 static void __exit cleanup_pxa2xx_flash(void) 169 { 170 platform_driver_unregister(&pxa2xx_flash_driver); 171 } 172 173 module_init(init_pxa2xx_flash); 174 module_exit(cleanup_pxa2xx_flash); 175 176 MODULE_LICENSE("GPL"); 177 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>"); 178 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx"); 179