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