cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pxa2xx-flash.c (3424B)

      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
     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		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
     99static 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
    114static 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
    125static 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
    134module_platform_driver(pxa2xx_flash_driver);
    135
    136MODULE_LICENSE("GPL");
    137MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
    138MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");