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