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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
217 lines
4.6 KiB
C
217 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* drivers/mtd/maps/plat-ram.c
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*
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* (c) 2004-2005 Simtec Electronics
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* http://www.simtec.co.uk/products/SWLINUX/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Generic platform device based RAM map
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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/kernel.h>
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#include <linux/string.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/slab.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 <linux/mtd/plat-ram.h>
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#include <asm/io.h>
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/* private structure for each mtd platform ram device created */
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struct platram_info {
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struct device *dev;
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struct mtd_info *mtd;
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struct map_info map;
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struct platdata_mtd_ram *pdata;
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};
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/* to_platram_info()
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*
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* device private data to struct platram_info conversion
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*/
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static inline struct platram_info *to_platram_info(struct platform_device *dev)
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{
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return platform_get_drvdata(dev);
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}
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/* platram_setrw
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*
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* call the platform device's set rw/ro control
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*
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* to = 0 => read-only
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* = 1 => read-write
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*/
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static inline void platram_setrw(struct platram_info *info, int to)
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{
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if (info->pdata == NULL)
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return;
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if (info->pdata->set_rw != NULL)
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(info->pdata->set_rw)(info->dev, to);
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}
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/* platram_remove
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*
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* called to remove the device from the driver's control
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*/
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static int platram_remove(struct platform_device *pdev)
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{
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struct platram_info *info = to_platram_info(pdev);
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dev_dbg(&pdev->dev, "removing device\n");
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if (info == NULL)
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return 0;
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if (info->mtd) {
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mtd_device_unregister(info->mtd);
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map_destroy(info->mtd);
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}
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/* ensure ram is left read-only */
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platram_setrw(info, PLATRAM_RO);
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kfree(info);
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return 0;
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}
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/* platram_probe
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*
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* called from device drive system when a device matching our
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* driver is found.
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*/
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static int platram_probe(struct platform_device *pdev)
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{
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struct platdata_mtd_ram *pdata;
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struct platram_info *info;
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struct resource *res;
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int err = 0;
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dev_dbg(&pdev->dev, "probe entered\n");
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if (dev_get_platdata(&pdev->dev) == NULL) {
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dev_err(&pdev->dev, "no platform data supplied\n");
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err = -ENOENT;
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goto exit_error;
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}
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pdata = dev_get_platdata(&pdev->dev);
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (info == NULL) {
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err = -ENOMEM;
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goto exit_error;
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}
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platform_set_drvdata(pdev, info);
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info->dev = &pdev->dev;
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info->pdata = pdata;
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/* get the resource for the memory mapping */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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info->map.virt = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(info->map.virt)) {
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err = PTR_ERR(info->map.virt);
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dev_err(&pdev->dev, "failed to ioremap() region\n");
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goto exit_free;
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}
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dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,
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(unsigned long long)res->start);
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/* setup map parameters */
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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.name = pdata->mapname != NULL ?
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(char *)pdata->mapname : (char *)pdev->name;
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info->map.bankwidth = pdata->bankwidth;
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dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
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simple_map_init(&info->map);
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dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");
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/* probe for the right mtd map driver
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* supplied by the platform_data struct */
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if (pdata->map_probes) {
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const char * const *map_probes = pdata->map_probes;
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for ( ; !info->mtd && *map_probes; map_probes++)
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info->mtd = do_map_probe(*map_probes , &info->map);
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}
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/* fallback to map_ram */
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else
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info->mtd = do_map_probe("map_ram", &info->map);
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if (info->mtd == NULL) {
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dev_err(&pdev->dev, "failed to probe for map_ram\n");
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err = -ENOMEM;
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goto exit_free;
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}
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info->mtd->dev.parent = &pdev->dev;
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platram_setrw(info, PLATRAM_RW);
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/* check to see if there are any available partitions, or whether
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* to add this device whole */
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err = mtd_device_parse_register(info->mtd, pdata->probes, NULL,
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pdata->partitions,
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pdata->nr_partitions);
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if (!err)
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dev_info(&pdev->dev, "registered mtd device\n");
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if (pdata->nr_partitions) {
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/* add the whole device. */
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err = mtd_device_register(info->mtd, NULL, 0);
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if (err) {
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dev_err(&pdev->dev,
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"failed to register the entire device\n");
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}
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}
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return err;
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exit_free:
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platram_remove(pdev);
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exit_error:
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return err;
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}
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/* device driver info */
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:mtd-ram");
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static struct platform_driver platram_driver = {
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.probe = platram_probe,
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.remove = platram_remove,
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.driver = {
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.name = "mtd-ram",
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},
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};
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module_platform_driver(platram_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("MTD platform RAM map driver");
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