On Tue, 9 Oct 2018 09:04:51 +0200
Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx> wrote:
> Hi Boris
>
> Maybe we want to leave the pdata example.
>
> /**
> * The platform resource layout expected looks something like:
> * struct mtd_partition partitions[] = { ... };
> * struct physmap_flash_data flash_data =
> .....
Sure, I'll add it back.
>
>
> On Mon, Oct 8, 2018 at 10:10 PM Boris Brezillon
> <boris.brezillon@xxxxxxxxxxx> wrote:
> >
> > Controlling some MSB address lines using GPIOs is just a small
> > deviation of the generic physmap logic, and merging those two drivers
> > allows us to share most of the probe logic, which is a good thing.
> >
> > Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
> > ---
> > drivers/mtd/maps/Kconfig | 19 ++-
> > drivers/mtd/maps/Makefile | 1 -
> > drivers/mtd/maps/gpio-addr-flash.c | 281 -------------------------------------
> > drivers/mtd/maps/physmap-core.c | 150 +++++++++++++++++++-
> > 4 files changed, 157 insertions(+), 294 deletions(-)
> > delete mode 100644 drivers/mtd/maps/gpio-addr-flash.c
> >
> > diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
> > index 5bffebacce86..4fd13d76b7b5 100644
> > --- a/drivers/mtd/maps/Kconfig
> > +++ b/drivers/mtd/maps/Kconfig
> > @@ -94,6 +94,15 @@ config MTD_PHYSMAP_OF_GEMINI
> > platforms, some detection and setting up parallel mode on the
> > external interface.
> >
> > +config MTD_PHYSMAP_GPIO_ADDR
> > + bool "GPIO-assisted Flash Chip Support"
> > + depends on MTD_PHYSMAP
> > + depends on GPIOLIB || COMPILE_TEST
> > + depends on MTD_COMPLEX_MAPPINGS
> > + help
> > + Extend the physmap driver to allow flashes to be partially
> > + physically addressed and assisted by GPIOs.
> > +
> > config MTD_PMC_MSP_EVM
> > tristate "CFI Flash device mapped on PMC-Sierra MSP"
> > depends on PMC_MSP && MTD_CFI
> > @@ -334,16 +343,6 @@ config MTD_PCMCIA_ANONYMOUS
> >
> > If unsure, say N.
> >
> > -config MTD_GPIO_ADDR
> > - tristate "GPIO-assisted Flash Chip Support"
> > - depends on GPIOLIB || COMPILE_TEST
> > - depends on MTD_COMPLEX_MAPPINGS
> > - help
> > - Map driver which allows flashes to be partially physically addressed
> > - and assisted by GPIOs.
> > -
> > - If compiled as a module, it will be called gpio-addr-flash.
> > -
> > config MTD_UCLINUX
> > bool "Generic uClinux RAM/ROM filesystem support"
> > depends on (MTD_RAM=y || MTD_ROM=y) && (!MMU || COLDFIRE)
> > diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
> > index ad32b185a120..acec0fbfa18d 100644
> > --- a/drivers/mtd/maps/Makefile
> > +++ b/drivers/mtd/maps/Makefile
> > @@ -43,6 +43,5 @@ obj-$(CONFIG_MTD_PLATRAM) += plat-ram.o
> > obj-$(CONFIG_MTD_INTEL_VR_NOR) += intel_vr_nor.o
> > obj-$(CONFIG_MTD_RBTX4939) += rbtx4939-flash.o
> > obj-$(CONFIG_MTD_VMU) += vmu-flash.o
> > -obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
> > obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o
> > obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o
> > diff --git a/drivers/mtd/maps/gpio-addr-flash.c b/drivers/mtd/maps/gpio-addr-flash.c
> > deleted file mode 100644
> > index a20e85aa770e..000000000000
> > --- a/drivers/mtd/maps/gpio-addr-flash.c
> > +++ /dev/null
> > @@ -1,281 +0,0 @@
> > -/*
> > - * drivers/mtd/maps/gpio-addr-flash.c
> > - *
> > - * 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@xxxxxxx>
> > - * Copyright © 2005-2009 Analog Devices Inc.
> > - *
> > - * Enter bugs at http://blackfin.uclinux.org/
> > - *
> > - * Licensed under the GPL-2 or later.
> > - */
> > -
> > -#include <linux/gpio.h>
> > -#include <linux/gpio/consumer.h>
> > -#include <linux/io.h>
> > -#include <linux/kernel.h>
> > -#include <linux/module.h>
> > -#include <linux/mtd/mtd.h>
> > -#include <linux/mtd/map.h>
> > -#include <linux/mtd/partitions.h>
> > -#include <linux/mtd/physmap.h>
> > -#include <linux/platform_device.h>
> > -#include <linux/slab.h>
> > -#include <linux/types.h>
> > -
> > -#define win_mask(x) ((BIT(x)) - 1)
> > -
> > -#define DRIVER_NAME "gpio-addr-flash"
> > -
> > -/**
> > - * struct async_state - keep GPIO flash state
> > - * @mtd: MTD state for this mapping
> > - * @map: MTD map state for this flash
> > - * @gpios: Struct containing the array of GPIO descriptors
> > - * @gpio_values: cached GPIO values
> > - * @win_order: dedicated memory size (if no GPIOs)
> > - */
> > -struct async_state {
> > - struct mtd_info *mtd;
> > - struct map_info map;
> > - struct gpio_descs *gpios;
> > - unsigned int gpio_values;
> > - unsigned int win_order;
> > -};
> > -#define gf_map_info_to_state(mi) ((struct async_state *)(mi)->map_priv_1)
> > -
> > -/**
> > - * gf_set_gpios() - set GPIO address lines to access specified flash offset
> > - * @state: GPIO flash state
> > - * @ofs: desired offset to access
> > - *
> > - * Rather than call the GPIO framework every time, cache the last-programmed
> > - * value. This speeds up sequential accesses (which are by far the most common
> > - * type).
> > - */
> > -static void gf_set_gpios(struct async_state *state, unsigned long ofs)
> > -{
> > - int i;
> > -
> > - ofs >>= state->win_order;
> > -
> > - if (ofs == state->gpio_values)
> > - return;
> > -
> > - for (i = 0; i < state->gpios->ndescs; i++) {
> > - if ((ofs & BIT(i)) == (state->gpio_values & BIT(i)))
> > - continue;
> > -
> > - gpiod_set_value(state->gpios->desc[i], !!(ofs & BIT(i)));
> > - }
> > -
> > - state->gpio_values = ofs;
> > -}
> > -
> > -/**
> > - * gf_read() - read a word at the specified offset
> > - * @map: MTD map state
> > - * @ofs: desired offset to read
> > - */
> > -static map_word gf_read(struct map_info *map, unsigned long ofs)
> > -{
> > - struct async_state *state = gf_map_info_to_state(map);
> > - uint16_t word;
> > - map_word test;
> > -
> > - gf_set_gpios(state, ofs);
> > -
> > - word = readw(map->virt + (ofs & win_mask(state->win_order)));
> > - test.x[0] = word;
> > - return test;
> > -}
> > -
> > -/**
> > - * gf_copy_from() - copy a chunk of data from the flash
> > - * @map: MTD map state
> > - * @to: memory to copy to
> > - * @from: flash offset to copy from
> > - * @len: how much to copy
> > - *
> > - * The "from" region may straddle more than one window, so toggle the GPIOs for
> > - * each window region before reading its data.
> > - */
> > -static void gf_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
> > -{
> > - struct async_state *state = gf_map_info_to_state(map);
> > -
> > - int this_len;
> > -
> > - while (len) {
> > - this_len = from & win_mask(state->win_order);
> > - this_len = BIT(state->win_order) - this_len;
> > - this_len = min_t(int, len, this_len);
> > -
> > - gf_set_gpios(state, from);
> > - memcpy_fromio(to,
> > - map->virt + (from & win_mask(state->win_order)),
> > - this_len);
> > - len -= this_len;
> > - from += this_len;
> > - to += this_len;
> > - }
> > -}
> > -
> > -/**
> > - * gf_write() - write a word at the specified offset
> > - * @map: MTD map state
> > - * @ofs: desired offset to write
> > - */
> > -static void gf_write(struct map_info *map, map_word d1, unsigned long ofs)
> > -{
> > - struct async_state *state = gf_map_info_to_state(map);
> > - uint16_t d;
> > -
> > - gf_set_gpios(state, ofs);
> > -
> > - d = d1.x[0];
> > - writew(d, map->virt + (ofs & win_mask(state->win_order)));
> > -}
> > -
> > -/**
> > - * gf_copy_to() - copy a chunk of data to the flash
> > - * @map: MTD map state
> > - * @to: flash offset to copy to
> > - * @from: memory to copy from
> > - * @len: how much to copy
> > - *
> > - * See gf_copy_from() caveat.
> > - */
> > -static void gf_copy_to(struct map_info *map, unsigned long to,
> > - const void *from, ssize_t len)
> > -{
> > - struct async_state *state = gf_map_info_to_state(map);
> > -
> > - int this_len;
> > -
> > - while (len) {
> > - this_len = to & win_mask(state->win_order);
> > - this_len = BIT(state->win_order) - this_len;
> > - this_len = min_t(int, len, this_len);
> > -
> > - gf_set_gpios(state, to);
> > - memcpy_toio(map->virt + (to & win_mask(state->win_order)),
> > - from, len);
> > -
> > - len -= this_len;
> > - to += this_len;
> > - from += this_len;
> > - }
> > -}
> > -
> > -static const char * const part_probe_types[] = {
> > - "cmdlinepart", "RedBoot", NULL };
> > -
> > -/**
> > - * gpio_flash_probe() - setup a mapping for a GPIO assisted flash
> > - * @pdev: platform device
> > - *
> > - * The platform resource layout expected looks something like:
> > - * struct mtd_partition partitions[] = { ... };
> > - * struct physmap_flash_data flash_data = { ... };
> > - * static struct gpiod_lookup_table addr_flash_gpios = {
> > - * .dev_id = "gpio-addr-flash.0",
> > - * .table = {
> > - * GPIO_LOOKUP_IDX("gpio.0", 15, "addr", 0, GPIO_ACTIVE_HIGH),
> > - * GPIO_LOOKUP_IDX("gpio.0", 16, "addr", 1, GPIO_ACTIVE_HIGH),
> > - * );
> > - * };
> > - * gpiod_add_lookup_table(&addr_flash_gpios);
> > - *
> > - * struct resource flash_resource[] = {
> > - * {
> > - * .name = "cfi_probe",
> > - * .start = 0x20000000,
> > - * .end = 0x201fffff,
> > - * .flags = IORESOURCE_MEM,
> > - * },
> > - * };
> > - * struct platform_device flash_device = {
> > - * .name = "gpio-addr-flash",
> > - * .dev = { .platform_data = &flash_data, },
> > - * .num_resources = ARRAY_SIZE(flash_resource),
> > - * .resource = flash_resource,
> > - * ...
> > - * };
> > - */
> > -static int gpio_flash_probe(struct platform_device *pdev)
> > -{
> > - struct physmap_flash_data *pdata;
> > - struct resource *memory;
> > - struct async_state *state;
> > -
> > - pdata = dev_get_platdata(&pdev->dev);
> > - memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > -
> > - if (!memory)
> > - return -EINVAL;
> > -
> > - state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
> > - if (!state)
> > - return -ENOMEM;
> > -
> > - state->gpios = devm_gpiod_get_array(&pdev->dev, "addr", GPIOD_OUT_LOW);
> > - if (IS_ERR(state->gpios))
> > - return PTR_ERR(state->gpios);
> > -
> > - state->win_order = get_bitmask_order(resource_size(memory)) - 1;
> > -
> > - state->map.name = DRIVER_NAME;
> > - state->map.read = gf_read;
> > - state->map.copy_from = gf_copy_from;
> > - state->map.write = gf_write;
> > - state->map.copy_to = gf_copy_to;
> > - state->map.bankwidth = pdata->width;
> > - state->map.size = BIT(state->win_order + state->gpios->ndescs);
> > - state->map.virt = devm_ioremap_resource(&pdev->dev, memory);
> > - if (IS_ERR(state->map.virt))
> > - return PTR_ERR(state->map.virt);
> > -
> > - state->map.phys = NO_XIP;
> > - state->map.map_priv_1 = (unsigned long)state;
> > -
> > - platform_set_drvdata(pdev, state);
> > -
> > - dev_notice(&pdev->dev, "probing %d-bit flash bus\n",
> > - state->map.bankwidth * 8);
> > - state->mtd = do_map_probe(memory->name, &state->map);
> > - if (!state->mtd)
> > - return -ENXIO;
> > - state->mtd->dev.parent = &pdev->dev;
> > -
> > - mtd_device_parse_register(state->mtd, part_probe_types, NULL,
> > - pdata->parts, pdata->nr_parts);
> > -
> > - return 0;
> > -}
> > -
> > -static int gpio_flash_remove(struct platform_device *pdev)
> > -{
> > - struct async_state *state = platform_get_drvdata(pdev);
> > -
> > - mtd_device_unregister(state->mtd);
> > - map_destroy(state->mtd);
> > - return 0;
> > -}
> > -
> > -static struct platform_driver gpio_flash_driver = {
> > - .probe = gpio_flash_probe,
> > - .remove = gpio_flash_remove,
> > - .driver = {
> > - .name = DRIVER_NAME,
> > - },
> > -};
> > -
> > -module_platform_driver(gpio_flash_driver);
> > -
> > -MODULE_AUTHOR("Mike Frysinger <vapier@xxxxxxxxxx>");
> > -MODULE_DESCRIPTION("MTD map driver for flashes addressed physically and with gpios");
> > -MODULE_LICENSE("GPL");
> > diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
> > index 7a50ff9ef812..2dc33ae71335 100644
> > --- a/drivers/mtd/maps/physmap-core.c
> > +++ b/drivers/mtd/maps/physmap-core.c
> > @@ -13,6 +13,14 @@
> > *
> > * 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@xxxxxxx>
> > + * Copyright © 2005-2009 Analog Devices Inc.
> > */
> >
> > #include <linux/module.h>
> > @@ -30,6 +38,7 @@
> > #include <linux/mtd/cfi_endian.h>
> > #include <linux/io.h>
> > #include <linux/of_device.h>
> > +#include <linux/gpio/consumer.h>
> >
> > #include "physmap_of_gemini.h"
> > #include "physmap_of_versatile.h"
> > @@ -45,6 +54,9 @@ struct physmap_flash_info {
> > 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)
> > @@ -104,6 +116,119 @@ static void physmap_set_vpp(struct map_info *map, int state)
> > 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[] = {
> > {
> > @@ -343,6 +468,16 @@ static int physmap_flash_probe(struct platform_device *dev)
> >
> > 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;
> > + }
> > +
> > err = physmap_flash_of_init(dev);
> > if (err)
> > err = physmap_flash_pdata_init(dev);
> > @@ -368,10 +503,20 @@ static int physmap_flash_probe(struct platform_device *dev)
> > if (!info->maps[i].phys)
> > info->maps[i].phys = res->start;
> >
> > - info->maps[i].size = resource_size(res);
> > + 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;
> >
> > - simple_map_init(&info->maps[i]);
> > + if (info->gpios) {
> > + err = physmap_addr_gpios_map_init(&info->maps[i]);
> > + if (err)
> > + goto err_out;
> > + } else {
> > + simple_map_init(&info->maps[i]);
> > + }
> >
> > probe_type = rom_probe_types;
> > if (!info->probe_type) {
> > @@ -496,6 +641,7 @@ module_exit(physmap_exit);
> > MODULE_LICENSE("GPL");
> > MODULE_AUTHOR("David Woodhouse <dwmw2@xxxxxxxxxxxxx>");
> > MODULE_AUTHOR("Vitaly Wool <vwool@xxxxxxxxxxxxx>");
> > +MODULE_AUTHOR("Mike Frysinger <vapier@xxxxxxxxxx>");
> > MODULE_DESCRIPTION("Generic configurable MTD map driver");
> >
> > /* legacy platform drivers can't hotplug or coldplg */
> > --
> > 2.14.1
> >
>
>
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Re: [PATCH 12/14] mtd: maps: Merge gpio-addr-flash.c into physmap-core.c
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- Subject: Re: [PATCH 12/14] mtd: maps: Merge gpio-addr-flash.c into physmap-core.c
- From: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
- Date: Tue, 9 Oct 2018 09:11:06 +0200
- Cc: Mark Rutland <mark.rutland@xxxxxxx>, devicetree@xxxxxxxxxxxxxxx, Pawel Moll <pawel.moll@xxxxxxx>, Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>, Richard Weinberger <richard@xxxxxx>, Marek Vasut <marek.vasut@xxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, linux-mtd@xxxxxxxxxxxxxxxxxxx, Kumar Gala <galak@xxxxxxxxxxxxxx>, Brian Norris <computersforpeace@xxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>
- In-reply-to: <CAPybu_3ZTNzB=PmidBRzW_ZG_H5Pwwp7sro52LuO58XpOzq+Tg@mail.gmail.com>
- References: <20181008201027.17952-1-boris.brezillon@bootlin.com> <20181008201027.17952-13-boris.brezillon@bootlin.com> <CAPybu_3ZTNzB=PmidBRzW_ZG_H5Pwwp7sro52LuO58XpOzq+Tg@mail.gmail.com>
- Follow-Ups:
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