--- /dev/null
+/*
+ * Copyright (C) 2013 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/physmap.h>
+#include <linux/mtd/concat.h>
+#include <linux/io.h>
+
+#include <asm/outercache.h>
+
+#define MAX_RESOURCES 4
+
+struct imx6x_weimnor_info {
+ struct mtd_info *mtd[MAX_RESOURCES];
+ struct mtd_info *cmtd;
+ struct map_info map[MAX_RESOURCES];
+ int nr_parts;
+ struct mtd_partition *parts;
+};
+
+static int imx6x_weimnor_remove(struct platform_device *dev)
+{
+ struct imx6x_weimnor_info *info;
+ int i;
+
+ info = platform_get_drvdata(dev);
+
+ if (info == NULL)
+ return 0;
+
+ platform_set_drvdata(dev, NULL);
+
+ if (info->cmtd) {
+ mtd_device_unregister(info->cmtd);
+ if (info->nr_parts)
+ kfree(info->parts);
+ if (info->cmtd != info->mtd[0])
+ mtd_concat_destroy(info->cmtd);
+ }
+
+ for (i = 0; i < MAX_RESOURCES; i++) {
+ if (info->mtd[i] != NULL)
+ map_destroy(info->mtd[i]);
+ if (info->map[i].cached)
+ iounmap(info->map[i].cached);
+ }
+
+ kfree(info);
+
+ return 0;
+}
+
+static void imx6x_set_vpp(struct map_info *map, int state)
+{
+ struct platform_device *pdev;
+ struct physmap_flash_data *flash;
+
+ pdev = (struct platform_device *)map->map_priv_1;
+ flash = pdev->dev.platform_data;
+
+ if (flash->set_vpp)
+ flash->set_vpp(pdev, state);
+}
+
+#define CACHELINESIZE 32
+static void imx6x_map_inval_cache(struct map_info *map, unsigned long from,
+ssize_t len)
+{
+ unsigned long start;
+ unsigned long end;
+ unsigned long phys_start;
+ unsigned long phys_end;
+
+ if (from > map->size) {
+ start = (unsigned long)map->cached + map->size;
+ phys_start = (unsigned long)map->phys + map->size;
+ } else {
+ start = (unsigned long)map->cached + from;
+ phys_start = (unsigned long)map->phys + from;
+ }
+
+ if ((from + len) > map->size) {
+ end = start + map->size;
+ phys_end = phys_start + map->size;
+ } else {
+ end = start + len;
+ phys_end = phys_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;
+ }
+ outer_inv_range(phys_start, phys_end);
+}
+
+static const char *rom_probe_types[] = {
+ "cfi_probe",
+ "jedec_probe",
+ "qinfo_probe",
+ "map_rom",
+ NULL};
+
+static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", "afs",
+ NULL};
+
+static int imx6x_weimnor_probe(struct platform_device *dev)
+{
+ struct physmap_flash_data *flash;
+ struct imx6x_weimnor_info *info;
+ const char **probe_type;
+ int err = 0;
+ int i;
+ int devices_found = 0;
+
+ flash = dev->dev.platform_data;
+ if (flash == NULL)
+ return -ENODEV;
+
+ info = devm_kzalloc(&dev->dev, sizeof(struct imx6x_weimnor_info),
+ GFP_KERNEL);
+ if (info == NULL) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ if (flash->init) {
+ err = flash->init(dev);
+ if (err)
+ goto err_out;
+ }
+
+ platform_set_drvdata(dev, info);
+
+ for (i = 0; i < dev->num_resources; i++) {
+ printk(KERN_NOTICE
+ "imx6x-flash (physmap) platform "
+ "flash device: %.8llx at %.8llx\n",
+ (unsigned long long)resource_size(&dev->resource[i]),
+ (unsigned long long)dev->resource[i].start);
+
+ if (!devm_request_mem_region(&dev->dev,
+ dev->resource[i].start,
+ resource_size(&dev->resource[i]),
+ dev_name(&dev->dev))) {
+ dev_err(&dev->dev, "Could not reserve memory region\n");
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ info->map[i].name = dev_name(&dev->dev);
+ info->map[i].phys = dev->resource[i].start;
+ info->map[i].size = resource_size(&dev->resource[i]);
+ info->map[i].bankwidth = flash->width;
+ info->map[i].set_vpp = imx6x_set_vpp;
+ info->map[i].pfow_base = 0;
+ info->map[i].map_priv_1 = (unsigned long)dev;
+ info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
+ info->map[i].size);
+ if (info->map[i].virt == NULL) {
+ dev_err(&dev->dev, "Failed to ioremap flash region\n");
+ err = -EIO;
+ goto err_out;
+ }
+
+ info->map[i].cached =
+ ioremap_cached(info->map[i].phys, info->map[i].size);
+ if (!info->map[i].cached)
+ printk(KERN_WARNING "Failed to ioremap cached %s\n",
+ info->map[i].name);
+
+ info->map[i].inval_cache = imx6x_map_inval_cache;
+
+ simple_map_init(&info->map[i]);
+ probe_type = rom_probe_types;
+
+ for (; info->mtd[i] == NULL && *probe_type != NULL;
+ probe_type++)
+ info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
+
+ if (info->mtd[i] == NULL) {
+ dev_err(&dev->dev, "map_probe failed\n");
+ err = -ENXIO;
+ goto err_out;
+ } else {
+ devices_found++;
+ }
+ info->mtd[i]->owner = THIS_MODULE;
+ info->mtd[i]->dev.parent = &dev->dev;
+ }
+
+ if (devices_found == 1) {
+ info->cmtd = info->mtd[0];
+ } else if (devices_found > 1) {
+ /*
+ * We detected multiple devices. Concatenate them together.
+ */
+ info->cmtd = mtd_concat_create(info->mtd, devices_found,
+ dev_name(&dev->dev));
+ if (info->cmtd == NULL)
+ err = -ENXIO;
+ }
+ if (err)
+ goto err_out;
+
+ err = parse_mtd_partitions(info->cmtd, part_probe_types,
+ &info->parts, 0);
+ if (err > 0) {
+ mtd_device_register(info->cmtd, info->parts, err);
+ info->nr_parts = err;
+ return 0;
+ }
+
+ if (flash->nr_parts) {
+ printk(KERN_NOTICE "Using physmap partition information\n");
+ mtd_device_register(info->cmtd, flash->parts,
+ flash->nr_parts);
+ return 0;
+ }
+
+ mtd_device_register(info->cmtd, NULL, 0);
+
+ return 0;
+
+err_out:
+ imx6x_weimnor_remove(dev);
+ return err;
+}
+
+#ifdef CONFIG_PM
+static void imx6x_weimnor_shutdown(struct platform_device *dev)
+{
+ struct imx6x_weimnor_info *info = platform_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
+ if (info->mtd[i]->suspend && info->mtd[i]->resume)
+ if (info->mtd[i]->suspend(info->mtd[i]) == 0)
+ info->mtd[i]->resume(info->mtd[i]);
+}
+#else
+#define imx6x_weimnor_shutdown NULL
+#endif
+
+static struct platform_driver imx6x_weimnor_driver = {
+ .probe = imx6x_weimnor_probe,
+ .remove = __devexit_p(imx6x_weimnor_remove),
+ .shutdown = imx6x_weimnor_shutdown,
+ .driver = {
+ .name = "imx6x-weimnor",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init imx6x_init(void)
+{
+ int err;
+ err = platform_driver_register(&imx6x_weimnor_driver);
+ return err;
+}
+
+static void __exit imx6x_exit(void)
+{
+ platform_driver_unregister(&imx6x_weimnor_driver);
+}
+
+module_init(imx6x_init);
+module_exit(imx6x_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Oliver Brown <oliver.brown@freescale.com>");
+MODULE_DESCRIPTION("MTD map driver for Freescale iMX");
+
projects / karo-tx-linux.git / commitdiff