mtd: maps: Prepare merging of physmap and physmap_of

We want to merge the physmap and physmap_of driver, but before we can
do that we must prepare things to create physmap.o out of several .c
files. Rename physmap.c into physmap-core.c and add a new Makefile
rule to create physmap.o (right now it only contains physmap-core.o).

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
new file mode 100644
index 000000000000..e27051bc5dc6
--- /dev/null
+++ b/drivers/mtd/maps/physmap-core.c
@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Normal mappings of chips in physical memory
+ *
+ * Copyright (C) 2003 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ * 031022 - [jsun] add run-time configure and partition setup
+ */
+
+#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>
+
+struct physmap_flash_info {
+	unsigned int		nmaps;
+	struct mtd_info		**mtds;
+	struct mtd_info		*cmtd;
+	struct map_info		*maps;
+	spinlock_t		vpp_lock;
+	int			vpp_refcnt;
+};
+
+static int physmap_flash_remove(struct platform_device *dev)
+{
+	struct physmap_flash_info *info;
+	struct physmap_flash_data *physmap_data;
+	int i, err;
+
+	info = platform_get_drvdata(dev);
+	if (!info)
+		return 0;
+
+	physmap_data = dev_get_platdata(&dev->dev);
+
+	if (info->cmtd) {
+		err = mtd_device_unregister(info->cmtd);
+		if (err)
+			return err;
+
+		if (info->cmtd != info->mtds[0])
+			mtd_concat_destroy(info->cmtd);
+	}
+
+	for (i = 0; i < info->nmaps; i++) {
+		if (info->mtds[i])
+			map_destroy(info->mtds[i]);
+	}
+
+	if (physmap_data->exit)
+		physmap_data->exit(dev);
+
+	return 0;
+}
+
+static void physmap_set_vpp(struct map_info *map, int state)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_data *physmap_data;
+	struct physmap_flash_info *info;
+	unsigned long flags;
+
+	pdev = (struct platform_device *)map->map_priv_1;
+	physmap_data = dev_get_platdata(&pdev->dev);
+
+	if (!physmap_data->set_vpp)
+		return;
+
+	info = platform_get_drvdata(pdev);
+
+	spin_lock_irqsave(&info->vpp_lock, flags);
+	if (state) {
+		if (++info->vpp_refcnt == 1)    /* first nested 'on' */
+			physmap_data->set_vpp(pdev, 1);
+	} else {
+		if (--info->vpp_refcnt == 0)    /* last nested 'off' */
+			physmap_data->set_vpp(pdev, 0);
+	}
+	spin_unlock_irqrestore(&info->vpp_lock, flags);
+}
+
+static const char * const rom_probe_types[] = {
+	"cfi_probe", "jedec_probe", "qinfo_probe", "map_rom", NULL
+};
+
+static const char * const part_probe_types[] = {
+	"cmdlinepart", "RedBoot", "afs", NULL
+};
+
+static int physmap_flash_probe(struct platform_device *dev)
+{
+	struct physmap_flash_data *physmap_data;
+	struct physmap_flash_info *info;
+	const char * const *probe_type;
+	const char * const *part_types;
+	int err = 0;
+	int i;
+
+	physmap_data = dev_get_platdata(&dev->dev);
+	if (!physmap_data)
+		return -ENODEV;
+
+	info = devm_kzalloc(&dev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	while (platform_get_resource(dev, IORESOURCE_MEM, info->nmaps))
+		info->nmaps++;
+
+	if (!info->nmaps)
+		return -ENODEV;
+
+	info->maps = devm_kzalloc(&dev->dev,
+				  sizeof(*info->maps) * info->nmaps,
+				  GFP_KERNEL);
+	if (!info->maps)
+		return -ENOMEM;
+
+	info->mtds = devm_kzalloc(&dev->dev,
+				  sizeof(*info->mtds) * info->nmaps,
+				  GFP_KERNEL);
+	if (!info->mtds)
+		return -ENOMEM;
+
+	if (physmap_data->init) {
+		err = physmap_data->init(dev);
+		if (err)
+			goto err_out;
+	}
+
+	platform_set_drvdata(dev, info);
+
+	for (i = 0; i < info->nmaps; i++) {
+		struct resource *res;
+
+		res = platform_get_resource(dev, IORESOURCE_MEM, i);
+		info->maps[i].virt = devm_ioremap_resource(&dev->dev, res);
+		if (IS_ERR(info->maps[i].virt)) {
+			err = PTR_ERR(info->maps[i].virt);
+			goto err_out;
+		}
+
+		dev_notice(&dev->dev, "physmap platform flash device: %pR\n",
+			   res);
+
+		info->maps[i].name = dev_name(&dev->dev);
+		info->maps[i].phys = res->start;
+		info->maps[i].size = resource_size(res);
+		info->maps[i].bankwidth = physmap_data->width;
+		info->maps[i].set_vpp = physmap_set_vpp;
+		info->maps[i].pfow_base = physmap_data->pfow_base;
+		info->maps[i].map_priv_1 = (unsigned long)dev;
+
+		simple_map_init(&info->maps[i]);
+
+		probe_type = rom_probe_types;
+		if (!physmap_data->probe_type) {
+			for (; !info->mtds[i] && *probe_type; probe_type++)
+				info->mtds[i] = do_map_probe(*probe_type,
+							     &info->maps[i]);
+		} else {
+			info->mtds[i] = do_map_probe(physmap_data->probe_type,
+						     &info->maps[i]);
+		}
+
+		if (!info->mtds[i]) {
+			dev_err(&dev->dev, "map_probe failed\n");
+			err = -ENXIO;
+			goto err_out;
+		}
+		info->mtds[i]->dev.parent = &dev->dev;
+	}
+
+	if (info->nmaps == 1) {
+		info->cmtd = info->mtds[0];
+	} else {
+		/*
+		 * We detected multiple devices. Concatenate them together.
+		 */
+		info->cmtd = mtd_concat_create(info->mtds, info->nmaps,
+					       dev_name(&dev->dev));
+		if (!info->cmtd)
+			err = -ENXIO;
+	}
+	if (err)
+		goto err_out;
+
+	spin_lock_init(&info->vpp_lock);
+
+	part_types = physmap_data->part_probe_types ? : part_probe_types;
+
+	err = mtd_device_parse_register(info->cmtd, part_types, NULL,
+					physmap_data->parts,
+					physmap_data->nr_parts);
+	if (err)
+		goto err_out;
+
+	return 0;
+
+err_out:
+	physmap_flash_remove(dev);
+	return err;
+}
+
+#ifdef CONFIG_PM
+static void physmap_flash_shutdown(struct platform_device *dev)
+{
+	struct physmap_flash_info *info = platform_get_drvdata(dev);
+	int i;
+
+	for (i = 0; i < info->nmaps && info->mtds[i]; i++)
+		if (mtd_suspend(info->mtds[i]) == 0)
+			mtd_resume(info->mtds[i]);
+}
+#else
+#define physmap_flash_shutdown NULL
+#endif
+
+static struct platform_driver physmap_flash_driver = {
+	.probe		= physmap_flash_probe,
+	.remove		= physmap_flash_remove,
+	.shutdown	= physmap_flash_shutdown,
+	.driver		= {
+		.name	= "physmap-flash",
+	},
+};
+
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
+static struct physmap_flash_data physmap_flash_data = {
+	.width		= CONFIG_MTD_PHYSMAP_BANKWIDTH,
+};
+
+static struct resource physmap_flash_resource = {
+	.start		= CONFIG_MTD_PHYSMAP_START,
+	.end		= CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
+	.flags		= IORESOURCE_MEM,
+};
+
+static struct platform_device physmap_flash = {
+	.name		= "physmap-flash",
+	.id		= 0,
+	.dev		= {
+		.platform_data	= &physmap_flash_data,
+	},
+	.num_resources	= 1,
+	.resource	= &physmap_flash_resource,
+};
+#endif
+
+static int __init physmap_init(void)
+{
+	int err;
+
+	err = platform_driver_register(&physmap_flash_driver);
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
+	if (err == 0) {
+		err = platform_device_register(&physmap_flash);
+		if (err)
+			platform_driver_unregister(&physmap_flash_driver);
+	}
+#endif
+
+	return err;
+}
+
+static void __exit physmap_exit(void)
+{
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
+	platform_device_unregister(&physmap_flash);
+#endif
+	platform_driver_unregister(&physmap_flash_driver);
+}
+
+module_init(physmap_init);
+module_exit(physmap_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Generic configurable MTD map driver");
+
+/* legacy platform drivers can't hotplug or coldplg */
+#ifndef CONFIG_MTD_PHYSMAP_COMPAT
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:physmap-flash");
+#endif