mirror of
https://github.com/torvalds/linux
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7769aea2a2
This reverts commit 06968a5479 ("mtd: pxa2xx-flash: switch from
ioremap_cache to memremap"), since NOR with memory semantics in array mode
and RAM are not necessarily the same thing, and architectures may implement
ioremap_cached() and memremap() with different memory attributes.
For this reason, ioremap_cached() has been brought back from the dead on
the ARM side, so switch this driver back to using it instead of memremap().
Cc: David Woodhouse <dwmw2@infradead.org>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
/*
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* Map driver for Intel XScale PXA2xx platforms.
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*
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* Author: Nicolas Pitre
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* Copyright: (C) 2001 MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <mach/hardware.h>
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#include <asm/mach/flash.h>
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#define CACHELINESIZE 32
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static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
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ssize_t len)
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{
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unsigned long start = (unsigned long)map->cached + from;
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unsigned long end = start + len;
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start &= ~(CACHELINESIZE - 1);
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while (start < end) {
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/* invalidate D cache line */
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asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
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start += CACHELINESIZE;
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}
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}
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struct pxa2xx_flash_info {
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struct mtd_info *mtd;
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struct map_info map;
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};
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static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
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static int pxa2xx_flash_probe(struct platform_device *pdev)
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{
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struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
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struct pxa2xx_flash_info *info;
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->map.name = flash->name;
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info->map.bankwidth = flash->width;
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info->map.phys = res->start;
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info->map.size = resource_size(res);
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info->map.virt = ioremap(info->map.phys, info->map.size);
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if (!info->map.virt) {
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printk(KERN_WARNING "Failed to ioremap %s\n",
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info->map.name);
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return -ENOMEM;
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}
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info->map.cached =
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ioremap_cached(info->map.phys, info->map.size);
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if (!info->map.cached)
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printk(KERN_WARNING "Failed to ioremap cached %s\n",
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info->map.name);
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info->map.inval_cache = pxa2xx_map_inval_cache;
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simple_map_init(&info->map);
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printk(KERN_NOTICE
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"Probing %s at physical address 0x%08lx"
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" (%d-bit bankwidth)\n",
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info->map.name, (unsigned long)info->map.phys,
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info->map.bankwidth * 8);
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info->mtd = do_map_probe(flash->map_name, &info->map);
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if (!info->mtd) {
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iounmap((void *)info->map.virt);
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if (info->map.cached)
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iounmap(info->map.cached);
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return -EIO;
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}
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info->mtd->dev.parent = &pdev->dev;
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mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
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flash->nr_parts);
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platform_set_drvdata(pdev, info);
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return 0;
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}
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static int pxa2xx_flash_remove(struct platform_device *dev)
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{
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struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
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mtd_device_unregister(info->mtd);
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map_destroy(info->mtd);
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iounmap(info->map.virt);
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if (info->map.cached)
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iounmap(info->map.cached);
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kfree(info);
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return 0;
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}
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#ifdef CONFIG_PM
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static void pxa2xx_flash_shutdown(struct platform_device *dev)
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{
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struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
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if (info && mtd_suspend(info->mtd) == 0)
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mtd_resume(info->mtd);
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}
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#else
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#define pxa2xx_flash_shutdown NULL
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#endif
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static struct platform_driver pxa2xx_flash_driver = {
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.driver = {
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.name = "pxa2xx-flash",
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},
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.probe = pxa2xx_flash_probe,
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.remove = pxa2xx_flash_remove,
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.shutdown = pxa2xx_flash_shutdown,
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};
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module_platform_driver(pxa2xx_flash_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
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MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
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