Hi Boris,
I've just come across the commit from this patch.
On 19/10/18 8:49 PM, Boris Brezillon wrote:
> There's no real reason to have two separate driver for the DT and pdata
> case. Just do what we do everywhere else and handle DT and pdata
> parsing in the same driver.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
> Reviewed-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
> ---
> Changes in v2:
> - Add Ricardo's R-b
> - Fix 2 checks (reported by Ricardo)
> ---
> drivers/mtd/maps/Kconfig | 4 +-
> drivers/mtd/maps/Makefile | 7 +-
> drivers/mtd/maps/physmap-core.c | 261 +++++++++++++++++++++++---
> drivers/mtd/maps/physmap_of_core.c | 368 -------------------------------------
> 4 files changed, 240 insertions(+), 400 deletions(-)
> delete mode 100644 drivers/mtd/maps/physmap_of_core.c
>
> diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
> index afb36bff13a7..5bffebacce86 100644
> --- a/drivers/mtd/maps/Kconfig
> +++ b/drivers/mtd/maps/Kconfig
> @@ -66,8 +66,8 @@ config MTD_PHYSMAP_BANKWIDTH
> used internally by the CFI drivers.
>
> config MTD_PHYSMAP_OF
> - tristate "Memory device in physical memory map based on OF description"
> - depends on OF && (MTD_CFI || MTD_JEDECPROBE || MTD_ROM || MTD_RAM)
> + bool "Memory device in physical memory map based on OF description"
> + depends on OF && MTD_PHYSMAP
Previously we could select MTD_PHYSMAP_OF if MTD_RAM was defined. After
this change we can't select this because MTD_PHYSMAP does not have
MTD_RAM as dependency.
I'm just in the process of porting the latest kernel to a platform with
parallel SRAM and NAND via a dedicated controller. I haven't got to a
point where the platform is booting but I suspect I'll loose my SRAM.
> help
> This provides a 'mapping' driver which allows the NOR Flash, ROM
> and RAM driver code to communicate with chips which are mapped
> diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
> index 2574909edffd..ad32b185a120 100644
> --- a/drivers/mtd/maps/Makefile
> +++ b/drivers/mtd/maps/Makefile
> @@ -18,13 +18,10 @@ obj-$(CONFIG_MTD_CK804XROM) += ck804xrom.o
> obj-$(CONFIG_MTD_TSUNAMI) += tsunami_flash.o
> obj-$(CONFIG_MTD_PXA2XX) += pxa2xx-flash.o
> physmap-objs-y += physmap-core.o
> +physmap-objs-$(CONFIG_MTD_PHYSMAP_OF_VERSATILE) += physmap_of_versatile.o
> +physmap-objs-$(CONFIG_MTD_PHYSMAP_OF_GEMINI) += physmap_of_gemini.o
> physmap-objs := $(physmap-objs-y)
> obj-$(CONFIG_MTD_PHYSMAP) += physmap.o
> -physmap_of-objs-y += physmap_of_core.o
> -physmap_of-objs-$(CONFIG_MTD_PHYSMAP_OF_VERSATILE) += physmap_of_versatile.o
> -physmap_of-objs-$(CONFIG_MTD_PHYSMAP_OF_GEMINI) += physmap_of_gemini.o
> -physmap_of-objs := $(physmap_of-objs-y)
> -obj-$(CONFIG_MTD_PHYSMAP_OF) += physmap_of.o
> obj-$(CONFIG_MTD_PISMO) += pismo.o
> obj-$(CONFIG_MTD_PMC_MSP_EVM) += pmcmsp-flash.o
> obj-$(CONFIG_MTD_PCMCIA) += pcmciamtd.o
> diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
> index e27051bc5dc6..07af8368d173 100644
> --- a/drivers/mtd/maps/physmap-core.c
> +++ b/drivers/mtd/maps/physmap-core.c
> @@ -6,6 +6,13 @@
> * Author: Jun Sun, jsun@xxxxxxxxxx or jsun@xxxxxxxxxx
> *
> * 031022 - [jsun] add run-time configure and partition setup
> + *
> + * Device tree support:
> + * Copyright (C) 2006 MontaVista Software Inc.
> + * Author: Vitaly Wool <vwool@xxxxxxxxxxxxx>
> + *
> + * Revised to handle newer style flash binding by:
> + * Copyright (C) 2007 David Gibson, IBM Corporation.
> */
>
> #include <linux/module.h>
> @@ -20,7 +27,12 @@
> #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 "physmap_of_gemini.h"
> +#include "physmap_of_versatile.h"
>
> struct physmap_flash_info {
> unsigned int nmaps;
> @@ -29,6 +41,10 @@ struct physmap_flash_info {
> 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;
> };
>
> static int physmap_flash_remove(struct platform_device *dev)
> @@ -41,8 +57,6 @@ static int physmap_flash_remove(struct platform_device *dev)
> if (!info)
> return 0;
>
> - physmap_data = dev_get_platdata(&dev->dev);
> -
> if (info->cmtd) {
> err = mtd_device_unregister(info->cmtd);
> if (err)
> @@ -57,7 +71,8 @@ static int physmap_flash_remove(struct platform_device *dev)
> map_destroy(info->mtds[i]);
> }
>
> - if (physmap_data->exit)
> + physmap_data = dev_get_platdata(&dev->dev);
> + if (physmap_data && physmap_data->exit)
> physmap_data->exit(dev);
>
> return 0;
> @@ -89,6 +104,172 @@ static void physmap_set_vpp(struct map_info *map, int state)
> spin_unlock_irqrestore(&info->vpp_lock, flags);
> }
>
> +#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", NULL
> };
> @@ -97,18 +278,46 @@ static const char * const part_probe_types[] = {
> "cmdlinepart", "RedBoot", "afs", NULL
> };
>
> -static int physmap_flash_probe(struct platform_device *dev)
> +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;
> 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;
> + if (!dev->dev.of_node && !dev_get_platdata(&dev->dev))
> + return -EINVAL;
>
> info = devm_kzalloc(&dev->dev, sizeof(*info), GFP_KERNEL);
> if (!info)
> @@ -132,14 +341,16 @@ static int physmap_flash_probe(struct platform_device *dev)
> if (!info->mtds)
> return -ENOMEM;
>
> - if (physmap_data->init) {
> - err = physmap_data->init(dev);
> - if (err)
> - goto err_out;
> - }
> -
> platform_set_drvdata(dev, info);
>
> + 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;
>
> @@ -154,22 +365,22 @@ static int physmap_flash_probe(struct platform_device *dev)
> res);
>
> info->maps[i].name = dev_name(&dev->dev);
> - info->maps[i].phys = res->start;
> +
> + if (!info->maps[i].phys)
> + 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) {
> + if (!info->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->mtds[i] = do_map_probe(info->probe_type,
> &info->maps[i]);
> }
>
> @@ -197,11 +408,9 @@ static int physmap_flash_probe(struct platform_device *dev)
>
> 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);
> + 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;
>
> @@ -232,6 +441,7 @@ static struct platform_driver physmap_flash_driver = {
> .shutdown = physmap_flash_shutdown,
> .driver = {
> .name = "physmap-flash",
> + .of_match_table = of_flash_match,
> },
> };
>
> @@ -286,6 +496,7 @@ module_exit(physmap_exit);
>
> MODULE_LICENSE("GPL");
> MODULE_AUTHOR("David Woodhouse <dwmw2@xxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Vitaly Wool <vwool@xxxxxxxxxxxxx>");
> MODULE_DESCRIPTION("Generic configurable MTD map driver");
>
> /* legacy platform drivers can't hotplug or coldplg */
> diff --git a/drivers/mtd/maps/physmap_of_core.c b/drivers/mtd/maps/physmap_of_core.c
> deleted file mode 100644
> index ece605d78c21..000000000000
> --- a/drivers/mtd/maps/physmap_of_core.c
> +++ /dev/null
> @@ -1,368 +0,0 @@
> -/*
> - * Flash mappings described by the OF (or flattened) device tree
> - *
> - * Copyright (C) 2006 MontaVista Software Inc.
> - * Author: Vitaly Wool <vwool@xxxxxxxxxxxxx>
> - *
> - * Revised to handle newer style flash binding by:
> - * Copyright (C) 2007 David Gibson, IBM Corporation.
> - *
> - * 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.
> - */
> -
> -#include <linux/module.h>
> -#include <linux/types.h>
> -#include <linux/device.h>
> -#include <linux/mtd/mtd.h>
> -#include <linux/mtd/map.h>
> -#include <linux/mtd/partitions.h>
> -#include <linux/mtd/concat.h>
> -#include <linux/mtd/cfi_endian.h>
> -#include <linux/of.h>
> -#include <linux/of_address.h>
> -#include <linux/of_platform.h>
> -#include <linux/slab.h>
> -#include "physmap_of_gemini.h"
> -#include "physmap_of_versatile.h"
> -
> -struct of_flash_list {
> - struct mtd_info *mtd;
> - struct map_info map;
> -};
> -
> -struct of_flash {
> - struct mtd_info *cmtd;
> - int list_size; /* number of elements in of_flash_list */
> - struct of_flash_list list[0];
> -};
> -
> -static int of_flash_remove(struct platform_device *dev)
> -{
> - struct of_flash *info;
> - int i;
> -
> - info = dev_get_drvdata(&dev->dev);
> - if (!info)
> - return 0;
> - dev_set_drvdata(&dev->dev, NULL);
> -
> - if (info->cmtd) {
> - mtd_device_unregister(info->cmtd);
> - if (info->cmtd != info->list[0].mtd)
> - mtd_concat_destroy(info->cmtd);
> - }
> -
> - for (i = 0; i < info->list_size; i++)
> - if (info->list[i].mtd)
> - map_destroy(info->list[i].mtd);
> -
> - return 0;
> -}
> -
> -static const char * const rom_probe_types[] = {
> - "cfi_probe", "jedec_probe", "map_rom" };
> -
> -/* Helper function to handle probing of the obsolete "direct-mapped"
> - * compatible binding, which has an extra "probe-type" property
> - * describing the type of flash probe necessary. */
> -static struct mtd_info *obsolete_probe(struct platform_device *dev,
> - struct map_info *map)
> -{
> - struct device_node *dp = dev->dev.of_node;
> - const char *of_probe;
> - struct mtd_info *mtd;
> - int i;
> -
> - dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" "
> - "flash binding\n");
> -
> - of_probe = of_get_property(dp, "probe-type", NULL);
> - if (!of_probe) {
> - for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) {
> - mtd = do_map_probe(rom_probe_types[i], map);
> - if (mtd)
> - return mtd;
> - }
> - return NULL;
> - } else if (strcmp(of_probe, "CFI") == 0) {
> - return do_map_probe("cfi_probe", map);
> - } else if (strcmp(of_probe, "JEDEC") == 0) {
> - return do_map_probe("jedec_probe", map);
> - } else {
> - if (strcmp(of_probe, "ROM") != 0)
> - dev_warn(&dev->dev, "obsolete_probe: don't know probe "
> - "type '%s', mapping as rom\n", of_probe);
> - return do_map_probe("map_rom", map);
> - }
> -}
> -
> -/* When partitions are set we look for a linux,part-probe property which
> - specifies the list of partition probers to use. If none is given then the
> - default is use. These take precedence over other device tree
> - information. */
> -static const char * const part_probe_types_def[] = {
> - "cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
> -
> -static const char * const *of_get_probes(struct device_node *dp)
> -{
> - const char **res;
> - int count;
> -
> - count = of_property_count_strings(dp, "linux,part-probe");
> - if (count < 0)
> - return part_probe_types_def;
> -
> - res = kcalloc(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 void of_free_probes(const char * const *probes)
> -{
> - if (probes != part_probe_types_def)
> - kfree(probes);
> -}
> -
> -static const struct of_device_id of_flash_match[];
> -static int of_flash_probe(struct platform_device *dev)
> -{
> - const char * const *part_probe_types;
> - const struct of_device_id *match;
> - struct device_node *dp = dev->dev.of_node;
> - struct resource res;
> - struct of_flash *info;
> - const char *probe_type;
> - const __be32 *width;
> - int err;
> - int i;
> - int count;
> - const __be32 *p;
> - int reg_tuple_size;
> - struct mtd_info **mtd_list = NULL;
> - resource_size_t res_size;
> - bool map_indirect;
> - const char *mtd_name = NULL;
> -
> - match = of_match_device(of_flash_match, &dev->dev);
> - if (!match)
> - return -EINVAL;
> - probe_type = match->data;
> -
> - reg_tuple_size = (of_n_addr_cells(dp) + of_n_size_cells(dp)) * sizeof(u32);
> -
> - of_property_read_string(dp, "linux,mtd-name", &mtd_name);
> -
> - /*
> - * Get number of "reg" tuples. Scan for MTD devices on area's
> - * described by each "reg" region. This makes it possible (including
> - * the concat support) to support the Intel P30 48F4400 chips which
> - * consists internally of 2 non-identical NOR chips on one die.
> - */
> - p = of_get_property(dp, "reg", &count);
> - if (!p || count % reg_tuple_size != 0) {
> - dev_err(&dev->dev, "Malformed reg property on %pOF\n",
> - dev->dev.of_node);
> - err = -EINVAL;
> - goto err_flash_remove;
> - }
> - count /= reg_tuple_size;
> -
> - map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
> -
> - err = -ENOMEM;
> - info = devm_kzalloc(&dev->dev,
> - sizeof(struct of_flash) +
> - sizeof(struct of_flash_list) * count, GFP_KERNEL);
> - if (!info)
> - goto err_flash_remove;
> -
> - dev_set_drvdata(&dev->dev, info);
> -
> - mtd_list = kcalloc(count, sizeof(*mtd_list), GFP_KERNEL);
> - if (!mtd_list)
> - goto err_flash_remove;
> -
> - for (i = 0; i < count; i++) {
> - err = -ENXIO;
> - if (of_address_to_resource(dp, i, &res)) {
> - /*
> - * Continue with next register tuple if this
> - * one is not mappable
> - */
> - continue;
> - }
> -
> - dev_dbg(&dev->dev, "of_flash device: %pR\n", &res);
> -
> - err = -EBUSY;
> - res_size = resource_size(&res);
> - info->list[i].map.virt = devm_ioremap_resource(&dev->dev, &res);
> - if (IS_ERR(info->list[i].map.virt)) {
> - err = PTR_ERR(info->list[i].map.virt);
> - goto err_out;
> - }
> -
> - err = -ENXIO;
> - width = of_get_property(dp, "bank-width", NULL);
> - if (!width) {
> - dev_err(&dev->dev, "Can't get bank width from device"
> - " tree\n");
> - goto err_out;
> - }
> -
> - info->list[i].map.name = mtd_name ?: dev_name(&dev->dev);
> - info->list[i].map.phys = res.start;
> - info->list[i].map.size = res_size;
> - info->list[i].map.bankwidth = be32_to_cpup(width);
> - info->list[i].map.device_node = dp;
> -
> - if (of_property_read_bool(dp, "big-endian"))
> - info->list[i].map.swap = CFI_BIG_ENDIAN;
> - else if (of_property_read_bool(dp, "little-endian"))
> - info->list[i].map.swap = CFI_LITTLE_ENDIAN;
> -
> - err = of_flash_probe_gemini(dev, dp, &info->list[i].map);
> - if (err)
> - goto err_out;
> - err = of_flash_probe_versatile(dev, dp, &info->list[i].map);
> - if (err)
> - goto err_out;
> -
> - simple_map_init(&info->list[i].map);
> -
> - /*
> - * 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->list[i].map.phys = NO_XIP;
> -
> - if (probe_type) {
> - info->list[i].mtd = do_map_probe(probe_type,
> - &info->list[i].map);
> - } else {
> - info->list[i].mtd = obsolete_probe(dev,
> - &info->list[i].map);
> - }
> -
> - /* Fall back to mapping region as ROM */
> - if (!info->list[i].mtd) {
> - dev_warn(&dev->dev,
> - "do_map_probe() failed for type %s\n",
> - probe_type);
> -
> - info->list[i].mtd = do_map_probe("map_rom",
> - &info->list[i].map);
> - }
> - mtd_list[i] = info->list[i].mtd;
> -
> - err = -ENXIO;
> - if (!info->list[i].mtd) {
> - dev_err(&dev->dev, "do_map_probe() failed\n");
> - goto err_out;
> - } else {
> - info->list_size++;
> - }
> - info->list[i].mtd->dev.parent = &dev->dev;
> - }
> -
> - err = 0;
> - info->cmtd = NULL;
> - if (info->list_size == 1) {
> - info->cmtd = info->list[0].mtd;
> - } else if (info->list_size > 1) {
> - /*
> - * We detected multiple devices. Concatenate them together.
> - */
> - info->cmtd = mtd_concat_create(mtd_list, info->list_size,
> - dev_name(&dev->dev));
> - }
> - if (info->cmtd == NULL)
> - err = -ENXIO;
> -
> - if (err)
> - goto err_out;
> -
> - info->cmtd->dev.parent = &dev->dev;
> - mtd_set_of_node(info->cmtd, dp);
> - part_probe_types = of_get_probes(dp);
> - if (!part_probe_types) {
> - err = -ENOMEM;
> - goto err_out;
> - }
> - mtd_device_parse_register(info->cmtd, part_probe_types, NULL,
> - NULL, 0);
> - of_free_probes(part_probe_types);
> -
> - kfree(mtd_list);
> -
> - return 0;
> -
> -err_out:
> - kfree(mtd_list);
> -err_flash_remove:
> - of_flash_remove(dev);
> -
> - return err;
> -}
> -
> -static const struct of_device_id of_flash_match[] = {
> - {
> - .compatible = "cfi-flash",
> - .data = (void *)"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 = (void *)"jedec_probe",
> - },
> - {
> - .compatible = "mtd-ram",
> - .data = (void *)"map_ram",
> - },
> - {
> - .compatible = "mtd-rom",
> - .data = (void *)"map_rom",
> - },
> - {
> - .type = "rom",
> - .compatible = "direct-mapped"
> - },
> - { },
> -};
> -MODULE_DEVICE_TABLE(of, of_flash_match);
> -
> -static struct platform_driver of_flash_driver = {
> - .driver = {
> - .name = "of-flash",
> - .of_match_table = of_flash_match,
> - },
> - .probe = of_flash_probe,
> - .remove = of_flash_remove,
> -};
> -
> -module_platform_driver(of_flash_driver);
> -
> -MODULE_LICENSE("GPL");
> -MODULE_AUTHOR("Vitaly Wool <vwool@xxxxxxxxxxxxx>");
> -MODULE_DESCRIPTION("Device tree based MTD map driver");
>
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Re: [v2,11/15] mtd: maps: Merge physmap_of.c into physmap-core.c
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- Subject: Re: [v2,11/15] mtd: maps: Merge physmap_of.c into physmap-core.c
- From: Chris Packham <Chris.Packham@xxxxxxxxxxxxxxxxxxx>
- Date: Tue, 2 Apr 2019 23:44:31 +0000
- Accept-language: en-NZ, en-US
- Cc: Mark Rutland <mark.rutland@xxxxxxx>, "devicetree@xxxxxxxxxxxxxxx" <devicetree@xxxxxxxxxxxxxxx>, Pawel Moll <pawel.moll@xxxxxxx>, Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>, Linus Walleij <linus.walleij@xxxxxxxxxx>, "miquel.raynal@xxxxxxxxxxx" <miquel.raynal@xxxxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Kumar Gala <galak@xxxxxxxxxxxxxx>, Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
- References: <20181019074908.13226-12-boris.brezillon@bootlin.com>
- Follow-Ups:
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- From: Chris Packham
- Re: [v2,11/15] mtd: maps: Merge physmap_of.c into physmap-core.c
- References:
- [PATCH v2 11/15] mtd: maps: Merge physmap_of.c into physmap-core.c
- From: Boris Brezillon
- [PATCH v2 11/15] mtd: maps: Merge physmap_of.c into physmap-core.c
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