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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Map driver for Intel XScale PXA2xx platforms.4 *5 * Author: Nicolas Pitre6 * 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 3222 23static 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 37struct pxa2xx_flash_info {38 struct mtd_info *mtd;39 struct map_info map;40};41 42static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };43 44static 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 kfree(info);68 return -ENOMEM;69 }70 info->map.cached = ioremap_cache(info->map.phys, info->map.size);71 if (!info->map.cached)72 printk(KERN_WARNING "Failed to ioremap cached %s\n",73 info->map.name);74 info->map.inval_cache = pxa2xx_map_inval_cache;75 simple_map_init(&info->map);76 77 printk(KERN_NOTICE78 "Probing %s at physical address 0x%08lx"79 " (%d-bit bankwidth)\n",80 info->map.name, (unsigned long)info->map.phys,81 info->map.bankwidth * 8);82 83 info->mtd = do_map_probe(flash->map_name, &info->map);84 85 if (!info->mtd) {86 iounmap((void *)info->map.virt);87 if (info->map.cached)88 iounmap(info->map.cached);89 kfree(info);90 return -EIO;91 }92 info->mtd->dev.parent = &pdev->dev;93 94 mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,95 flash->nr_parts);96 97 platform_set_drvdata(pdev, info);98 return 0;99}100 101static void pxa2xx_flash_remove(struct platform_device *dev)102{103 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);104 105 mtd_device_unregister(info->mtd);106 107 map_destroy(info->mtd);108 iounmap(info->map.virt);109 if (info->map.cached)110 iounmap(info->map.cached);111 kfree(info);112}113 114#ifdef CONFIG_PM115static void pxa2xx_flash_shutdown(struct platform_device *dev)116{117 struct pxa2xx_flash_info *info = platform_get_drvdata(dev);118 119 if (info && mtd_suspend(info->mtd) == 0)120 mtd_resume(info->mtd);121}122#else123#define pxa2xx_flash_shutdown NULL124#endif125 126static struct platform_driver pxa2xx_flash_driver = {127 .driver = {128 .name = "pxa2xx-flash",129 },130 .probe = pxa2xx_flash_probe,131 .remove_new = pxa2xx_flash_remove,132 .shutdown = pxa2xx_flash_shutdown,133};134 135module_platform_driver(pxa2xx_flash_driver);136 137MODULE_LICENSE("GPL");138MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");139MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");140