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