1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Map driver for Intel XScale PXA2xx platforms. 4 * 5 * Author: Nicolas Pitre 6 * Copyright: (C) 2001 MontaVista Software Inc. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/slab.h> 12 #include <linux/kernel.h> 13 #include <linux/platform_device.h> 14 #include <linux/mtd/mtd.h> 15 #include <linux/mtd/map.h> 16 #include <linux/mtd/partitions.h> 17 18 #include <asm/io.h> 19 #include <asm/mach/flash.h> 20 21 #define CACHELINESIZE 32 22 23 static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from, 24 ssize_t len) 25 { 26 unsigned long start = (unsigned long)map->cached + from; 27 unsigned long end = start + len; 28 29 start &= ~(CACHELINESIZE - 1); 30 while (start < end) { 31 /* invalidate D cache line */ 32 asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)); 33 start += CACHELINESIZE; 34 } 35 } 36 37 struct pxa2xx_flash_info { 38 struct mtd_info *mtd; 39 struct map_info map; 40 }; 41 42 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL }; 43 44 static int pxa2xx_flash_probe(struct platform_device *pdev) 45 { 46 struct flash_platform_data *flash = dev_get_platdata(&pdev->dev); 47 struct pxa2xx_flash_info *info; 48 struct resource *res; 49 50 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 51 if (!res) 52 return -ENODEV; 53 54 info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL); 55 if (!info) 56 return -ENOMEM; 57 58 info->map.name = flash->name; 59 info->map.bankwidth = flash->width; 60 info->map.phys = res->start; 61 info->map.size = resource_size(res); 62 63 info->map.virt = ioremap(info->map.phys, info->map.size); 64 if (!info->map.virt) { 65 printk(KERN_WARNING "Failed to ioremap %s\n", 66 info->map.name); 67 return -ENOMEM; 68 } 69 info->map.cached = ioremap_cache(info->map.phys, info->map.size); 70 if (!info->map.cached) 71 printk(KERN_WARNING "Failed to ioremap cached %s\n", 72 info->map.name); 73 info->map.inval_cache = pxa2xx_map_inval_cache; 74 simple_map_init(&info->map); 75 76 printk(KERN_NOTICE 77 "Probing %s at physical address 0x%08lx" 78 " (%d-bit bankwidth)\n", 79 info->map.name, (unsigned long)info->map.phys, 80 info->map.bankwidth * 8); 81 82 info->mtd = do_map_probe(flash->map_name, &info->map); 83 84 if (!info->mtd) { 85 iounmap((void *)info->map.virt); 86 if (info->map.cached) 87 iounmap(info->map.cached); 88 return -EIO; 89 } 90 info->mtd->dev.parent = &pdev->dev; 91 92 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts, 93 flash->nr_parts); 94 95 platform_set_drvdata(pdev, info); 96 return 0; 97 } 98 99 static int pxa2xx_flash_remove(struct platform_device *dev) 100 { 101 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 102 103 mtd_device_unregister(info->mtd); 104 105 map_destroy(info->mtd); 106 iounmap(info->map.virt); 107 if (info->map.cached) 108 iounmap(info->map.cached); 109 kfree(info); 110 return 0; 111 } 112 113 #ifdef CONFIG_PM 114 static void pxa2xx_flash_shutdown(struct platform_device *dev) 115 { 116 struct pxa2xx_flash_info *info = platform_get_drvdata(dev); 117 118 if (info && mtd_suspend(info->mtd) == 0) 119 mtd_resume(info->mtd); 120 } 121 #else 122 #define pxa2xx_flash_shutdown NULL 123 #endif 124 125 static struct platform_driver pxa2xx_flash_driver = { 126 .driver = { 127 .name = "pxa2xx-flash", 128 }, 129 .probe = pxa2xx_flash_probe, 130 .remove = pxa2xx_flash_remove, 131 .shutdown = pxa2xx_flash_shutdown, 132 }; 133 134 module_platform_driver(pxa2xx_flash_driver); 135 136 MODULE_LICENSE("GPL"); 137 MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>"); 138 MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx"); 139