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linux-sg2042/drivers/mtd/maps/physmap-core.c

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// 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/pm_runtime.h>
#include <linux/gpio/consumer.h>
#include "physmap-bt1-rom.h"
#include "physmap-gemini.h"
#include "physmap-ixp4xx.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 = 0;
info = platform_get_drvdata(dev);
if (!info)
goto out;
if (info->cmtd) {
err = mtd_device_unregister(info->cmtd);
if (err)
goto out;
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);
out:
pm_runtime_put(&dev->dev);
pm_runtime_disable(&dev->dev);
return err;
}
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));
}
info->gpio_values = 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_bt1_rom(dev, dp, &info->maps[i]);
if (err)
return err;
err = of_flash_probe_gemini(dev, dp, &info->maps[i]);
if (err)
return err;
err = of_flash_probe_ixp4xx(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;
}
pm_runtime_enable(&dev->dev);
pm_runtime_get_sync(&dev->dev);
if (dev->dev.of_node)
err = physmap_flash_of_init(dev);
else
err = physmap_flash_pdata_init(dev);
if (err) {
pm_runtime_put(&dev->dev);
pm_runtime_disable(&dev->dev);
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);
if (!info->maps[i].name)
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
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