1 files changed, 665 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..d9a3e4bebe5d
--- /dev/null
+++ b/drivers/mtd/maps/physmap-core.c
@@ -0,0 +1,665 @@
+// 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
+ *
+ * Device tree support:
+ *    Copyright (C) 2006 MontaVista Software Inc.
+ *    Author: Vitaly Wool <vwool@ru.mvista.com>
+ *
+ *    Revised to handle newer style flash binding by:
+ *    Copyright (C) 2007 David Gibson, IBM Corporation.
+ *
+ * GPIO address extension:
+ *    Handle the case where a flash device is mostly addressed using physical
+ *    line and supplemented by GPIOs.  This way you can hook up say a 8MiB flash
+ *    to a 2MiB memory range and use the GPIOs to select a particular range.
+ *
+ *    Copyright © 2000 Nicolas Pitre <nico@cam.org>
+ *    Copyright © 2005-2009 Analog Devices Inc.
+ */
+
+#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/mtd/cfi_endian.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/gpio/consumer.h>
+
+#include "physmap-gemini.h"
+#include "physmap-versatile.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;
+	const char		*probe_type;
+	const char * const	*part_types;
+	unsigned int		nparts;
+	const struct mtd_partition *parts;
+	struct gpio_descs	*gpios;
+	unsigned int		gpio_values;
+	unsigned int		win_order;
+};
+
+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;
+
+	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]);
+	}
+
+	physmap_data = dev_get_platdata(&dev->dev);
+	if (physmap_data && 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);
+}
+
+#if IS_ENABLED(CONFIG_MTD_PHYSMAP_GPIO_ADDR)
+static void physmap_set_addr_gpios(struct physmap_flash_info *info,
+				   unsigned long ofs)
+{
+	unsigned int i;
+
+	ofs >>= info->win_order;
+	if (info->gpio_values == ofs)
+		return;
+
+	for (i = 0; i < info->gpios->ndescs; i++) {
+		if ((BIT(i) & ofs) == (BIT(i) & info->gpio_values))
+			continue;
+
+		gpiod_set_value(info->gpios->desc[i], !!(BIT(i) & ofs));
+	}
+}
+
+#define win_mask(order)		(BIT(order) - 1)
+
+static map_word physmap_addr_gpios_read(struct map_info *map,
+					unsigned long ofs)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_info *info;
+	map_word mw;
+	u16 word;
+
+	pdev = (struct platform_device *)map->map_priv_1;
+	info = platform_get_drvdata(pdev);
+	physmap_set_addr_gpios(info, ofs);
+
+	word = readw(map->virt + (ofs & win_mask(info->win_order)));
+	mw.x[0] = word;
+	return mw;
+}
+
+static void physmap_addr_gpios_copy_from(struct map_info *map, void *buf,
+					 unsigned long ofs, ssize_t len)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_info *info;
+
+	pdev = (struct platform_device *)map->map_priv_1;
+	info = platform_get_drvdata(pdev);
+
+	while (len) {
+		unsigned int winofs = ofs & win_mask(info->win_order);
+		unsigned int chunklen = min_t(unsigned int, len,
+					      BIT(info->win_order) - winofs);
+
+		physmap_set_addr_gpios(info, ofs);
+		memcpy_fromio(buf, map->virt + winofs, chunklen);
+		len -= chunklen;
+		buf += chunklen;
+		ofs += chunklen;
+	}
+}
+
+static void physmap_addr_gpios_write(struct map_info *map, map_word mw,
+				     unsigned long ofs)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_info *info;
+	u16 word;
+
+	pdev = (struct platform_device *)map->map_priv_1;
+	info = platform_get_drvdata(pdev);
+	physmap_set_addr_gpios(info, ofs);
+
+	word = mw.x[0];
+	writew(word, map->virt + (ofs & win_mask(info->win_order)));
+}
+
+static void physmap_addr_gpios_copy_to(struct map_info *map, unsigned long ofs,
+				       const void *buf, ssize_t len)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_info *info;
+
+	pdev = (struct platform_device *)map->map_priv_1;
+	info = platform_get_drvdata(pdev);
+
+	while (len) {
+		unsigned int winofs = ofs & win_mask(info->win_order);
+		unsigned int chunklen = min_t(unsigned int, len,
+					      BIT(info->win_order) - winofs);
+
+		physmap_set_addr_gpios(info, ofs);
+		memcpy_toio(map->virt + winofs, buf, chunklen);
+		len -= chunklen;
+		buf += chunklen;
+		ofs += chunklen;
+	}
+}
+
+static int physmap_addr_gpios_map_init(struct map_info *map)
+{
+	map->phys = NO_XIP;
+	map->read = physmap_addr_gpios_read;
+	map->copy_from = physmap_addr_gpios_copy_from;
+	map->write = physmap_addr_gpios_write;
+	map->copy_to = physmap_addr_gpios_copy_to;
+
+	return 0;
+}
+#else
+static int physmap_addr_gpios_map_init(struct map_info *map)
+{
+	return -ENOTSUPP;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_MTD_PHYSMAP_OF)
+static const struct of_device_id of_flash_match[] = {
+	{
+		.compatible = "cfi-flash",
+		.data = "cfi_probe",
+	},
+	{
+		/*
+		 * FIXME: JEDEC chips can't be safely and reliably
+		 * probed, although the mtd code gets it right in
+		 * practice most of the time.  We should use the
+		 * vendor and device ids specified by the binding to
+		 * bypass the heuristic probe code, but the mtd layer
+		 * provides, at present, no interface for doing so
+		 * :(.
+		 */
+		.compatible = "jedec-flash",
+		.data = "jedec_probe",
+	},
+	{
+		.compatible = "mtd-ram",
+		.data = "map_ram",
+	},
+	{
+		.compatible = "mtd-rom",
+		.data = "map_rom",
+	},
+	{
+		.type = "rom",
+		.compatible = "direct-mapped"
+	},
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, of_flash_match);
+
+static const char * const of_default_part_probes[] = {
+	"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL
+};
+
+static const char * const *of_get_part_probes(struct platform_device *dev)
+{
+	struct device_node *dp = dev->dev.of_node;
+	const char **res;
+	int count;
+
+	count = of_property_count_strings(dp, "linux,part-probe");
+	if (count < 0)
+		return of_default_part_probes;
+
+	res = devm_kcalloc(&dev->dev, count + 1, sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return NULL;
+
+	count = of_property_read_string_array(dp, "linux,part-probe", res,
+					      count);
+	if (count < 0)
+		return NULL;
+
+	return res;
+}
+
+static const char *of_select_probe_type(struct platform_device *dev)
+{
+	struct device_node *dp = dev->dev.of_node;
+	const struct of_device_id *match;
+	const char *probe_type;
+
+	match = of_match_device(of_flash_match, &dev->dev);
+	probe_type = match->data;
+	if (probe_type)
+		return probe_type;
+
+	dev_warn(&dev->dev,
+		 "Device tree uses obsolete \"direct-mapped\" flash binding\n");
+
+	of_property_read_string(dp, "probe-type", &probe_type);
+	if (!probe_type)
+		return NULL;
+
+	if (!strcmp(probe_type, "CFI")) {
+		probe_type = "cfi_probe";
+	} else if (!strcmp(probe_type, "JEDEC")) {
+		probe_type = "jedec_probe";
+	} else if (!strcmp(probe_type, "ROM")) {
+		probe_type = "map_rom";
+	} else {
+		dev_warn(&dev->dev,
+			 "obsolete_probe: don't know probe type '%s', mapping as rom\n",
+			 probe_type);
+		probe_type = "map_rom";
+	}
+
+	return probe_type;
+}
+
+static int physmap_flash_of_init(struct platform_device *dev)
+{
+	struct physmap_flash_info *info = platform_get_drvdata(dev);
+	struct device_node *dp = dev->dev.of_node;
+	const char *mtd_name = NULL;
+	int err, swap = 0;
+	bool map_indirect;
+	unsigned int i;
+	u32 bankwidth;
+
+	if (!dp)
+		return -EINVAL;
+
+	info->probe_type = of_select_probe_type(dev);
+
+	info->part_types = of_get_part_probes(dev);
+	if (!info->part_types)
+		return -ENOMEM;
+
+	of_property_read_string(dp, "linux,mtd-name", &mtd_name);
+
+	map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
+
+	err = of_property_read_u32(dp, "bank-width", &bankwidth);
+	if (err) {
+		dev_err(&dev->dev, "Can't get bank width from device tree\n");
+		return err;
+	}
+
+	if (of_property_read_bool(dp, "big-endian"))
+		swap = CFI_BIG_ENDIAN;
+	else if (of_property_read_bool(dp, "little-endian"))
+		swap = CFI_LITTLE_ENDIAN;
+
+	for (i = 0; i < info->nmaps; i++) {
+		info->maps[i].name = mtd_name;
+		info->maps[i].swap = swap;
+		info->maps[i].bankwidth = bankwidth;
+		info->maps[i].device_node = dp;
+
+		err = of_flash_probe_gemini(dev, dp, &info->maps[i]);
+		if (err)
+			return err;
+
+		err = of_flash_probe_versatile(dev, dp, &info->maps[i]);
+		if (err)
+			return err;
+
+		/*
+		 * On some platforms (e.g. MPC5200) a direct 1:1 mapping
+		 * may cause problems with JFFS2 usage, as the local bus (LPB)
+		 * doesn't support unaligned accesses as implemented in the
+		 * JFFS2 code via memcpy(). By setting NO_XIP, the
+		 * flash will not be exposed directly to the MTD users
+		 * (e.g. JFFS2) any more.
+		 */
+		if (map_indirect)
+			info->maps[i].phys = NO_XIP;
+	}
+
+	return 0;
+}
+#else /* IS_ENABLED(CONFIG_MTD_PHYSMAP_OF) */
+#define of_flash_match NULL
+
+static int physmap_flash_of_init(struct platform_device *dev)
+{
+	return -ENOTSUPP;
+}
+#endif /* IS_ENABLED(CONFIG_MTD_PHYSMAP_OF) */
+
+static const char * const rom_probe_types[] = {
+	"cfi_probe", "jedec_probe", "qinfo_probe", "map_rom",
+};
+
+static const char * const part_probe_types[] = {
+	"cmdlinepart", "RedBoot", "afs", NULL
+};
+
+static int physmap_flash_pdata_init(struct platform_device *dev)
+{
+	struct physmap_flash_info *info = platform_get_drvdata(dev);
+	struct physmap_flash_data *physmap_data;
+	unsigned int i;
+	int err;
+
+	physmap_data = dev_get_platdata(&dev->dev);
+	if (!physmap_data)
+		return -EINVAL;
+
+	info->probe_type = physmap_data->probe_type;
+	info->part_types = physmap_data->part_probe_types ? : part_probe_types;
+	info->parts = physmap_data->parts;
+	info->nparts = physmap_data->nr_parts;
+
+	if (physmap_data->init) {
+		err = physmap_data->init(dev);
+		if (err)
+			return err;
+	}
+
+	for (i = 0; i < info->nmaps; i++) {
+		info->maps[i].bankwidth = physmap_data->width;
+		info->maps[i].pfow_base = physmap_data->pfow_base;
+		info->maps[i].set_vpp = physmap_set_vpp;
+	}
+
+	return 0;
+}
+
+static int physmap_flash_probe(struct platform_device *dev)
+{
+	struct physmap_flash_info *info;
+	int err = 0;
+	int i;
+
+	if (!dev->dev.of_node && !dev_get_platdata(&dev->dev))
+		return -EINVAL;
+
+	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;
+
+	platform_set_drvdata(dev, info);
+
+	info->gpios = devm_gpiod_get_array_optional(&dev->dev, "addr",
+						    GPIOD_OUT_LOW);
+	if (IS_ERR(info->gpios))
+		return PTR_ERR(info->gpios);
+
+	if (info->gpios && info->nmaps > 1) {
+		dev_err(&dev->dev, "addr-gpios only supported for nmaps == 1\n");
+		return -EINVAL;
+	}
+
+	if (dev->dev.of_node)
+		err = physmap_flash_of_init(dev);
+	else
+		err = physmap_flash_pdata_init(dev);
+
+	if (err)
+		return err;
+
+	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);
+
+		if (!info->maps[i].phys)
+			info->maps[i].phys = res->start;
+
+		info->win_order = get_bitmask_order(resource_size(res)) - 1;
+		info->maps[i].size = BIT(info->win_order +
+					 (info->gpios ?
+					  info->gpios->ndescs : 0));
+
+		info->maps[i].map_priv_1 = (unsigned long)dev;
+
+		if (info->gpios) {
+			err = physmap_addr_gpios_map_init(&info->maps[i]);
+			if (err)
+				goto err_out;
+		}
+
+#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
+		/*
+		 * Only use the simple_map implementation if map hooks are not
+		 * implemented. Since map->read() is mandatory checking for its
+		 * presence is enough.
+		 */
+		if (!info->maps[i].read)
+			simple_map_init(&info->maps[i]);
+#else
+		simple_map_init(&info->maps[i]);
+#endif
+
+		if (info->probe_type) {
+			info->mtds[i] = do_map_probe(info->probe_type,
+						     &info->maps[i]);
+		} else {
+			int j;
+
+			for (j = 0; j < ARRAY_SIZE(rom_probe_types); j++) {
+				info->mtds[i] = do_map_probe(rom_probe_types[j],
+							     &info->maps[i]);
+				if (info->mtds[i])
+					break;
+			}
+		}
+
+		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);
+
+	mtd_set_of_node(info->cmtd, dev->dev.of_node);
+	err = mtd_device_parse_register(info->cmtd, info->part_types, NULL,
+					info->parts, info->nparts);
+	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",
+		.of_match_table = of_flash_match,
+	},
+};
+
+#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_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
+MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.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