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mtd: maps: Merge gpio-addr-flash.c into physmap-core.c
Controlling some MSB address lines using GPIOs is just a small deviation from the generic physmap logic, and merging those two drivers allows us to share most of the probe logic, which is a good thing. Also, the gpio-addr-flash driver is unused since the removal of the blackfin arch in v4.17, so we can safely remove the old driver without risking breaking existing boards. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Reviewed-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Tested-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Boris Brezillon
parent
3edf4b9f38
commit
ba32ce95cb
@ -94,6 +94,15 @@ config MTD_PHYSMAP_GEMINI
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platforms, some detection and setting up parallel mode on the
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external interface.
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config MTD_PHYSMAP_GPIO_ADDR
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bool "GPIO-assisted Flash Chip Support"
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depends on MTD_PHYSMAP
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depends on GPIOLIB || COMPILE_TEST
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depends on MTD_COMPLEX_MAPPINGS
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help
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Extend the physmap driver to allow flashes to be partially
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physically addressed and assisted by GPIOs.
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config MTD_PMC_MSP_EVM
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tristate "CFI Flash device mapped on PMC-Sierra MSP"
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depends on PMC_MSP && MTD_CFI
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@ -334,16 +343,6 @@ config MTD_PCMCIA_ANONYMOUS
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If unsure, say N.
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config MTD_GPIO_ADDR
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tristate "GPIO-assisted Flash Chip Support"
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depends on GPIOLIB || COMPILE_TEST
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depends on MTD_COMPLEX_MAPPINGS
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help
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Map driver which allows flashes to be partially physically addressed
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and assisted by GPIOs.
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If compiled as a module, it will be called gpio-addr-flash.
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config MTD_UCLINUX
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bool "Generic uClinux RAM/ROM filesystem support"
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depends on (MTD_RAM=y || MTD_ROM=y) && (!MMU || COLDFIRE)
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@ -43,6 +43,5 @@ obj-$(CONFIG_MTD_PLATRAM) += plat-ram.o
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obj-$(CONFIG_MTD_INTEL_VR_NOR) += intel_vr_nor.o
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obj-$(CONFIG_MTD_RBTX4939) += rbtx4939-flash.o
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obj-$(CONFIG_MTD_VMU) += vmu-flash.o
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obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
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obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o
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obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o
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@ -1,281 +0,0 @@
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/*
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* drivers/mtd/maps/gpio-addr-flash.c
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*
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* Handle the case where a flash device is mostly addressed using physical
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* line and supplemented by GPIOs. This way you can hook up say a 8MiB flash
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* to a 2MiB memory range and use the GPIOs to select a particular range.
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*
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* Copyright © 2000 Nicolas Pitre <nico@cam.org>
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* Copyright © 2005-2009 Analog Devices Inc.
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/physmap.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define win_mask(x) ((BIT(x)) - 1)
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#define DRIVER_NAME "gpio-addr-flash"
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/**
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* struct async_state - keep GPIO flash state
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* @mtd: MTD state for this mapping
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* @map: MTD map state for this flash
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* @gpios: Struct containing the array of GPIO descriptors
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* @gpio_values: cached GPIO values
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* @win_order: dedicated memory size (if no GPIOs)
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*/
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struct async_state {
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struct mtd_info *mtd;
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struct map_info map;
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struct gpio_descs *gpios;
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unsigned int gpio_values;
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unsigned int win_order;
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};
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#define gf_map_info_to_state(mi) ((struct async_state *)(mi)->map_priv_1)
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/**
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* gf_set_gpios() - set GPIO address lines to access specified flash offset
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* @state: GPIO flash state
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* @ofs: desired offset to access
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*
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* Rather than call the GPIO framework every time, cache the last-programmed
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* value. This speeds up sequential accesses (which are by far the most common
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* type).
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*/
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static void gf_set_gpios(struct async_state *state, unsigned long ofs)
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{
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int i;
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ofs >>= state->win_order;
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if (ofs == state->gpio_values)
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return;
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for (i = 0; i < state->gpios->ndescs; i++) {
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if ((ofs & BIT(i)) == (state->gpio_values & BIT(i)))
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continue;
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gpiod_set_value(state->gpios->desc[i], !!(ofs & BIT(i)));
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}
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state->gpio_values = ofs;
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}
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/**
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* gf_read() - read a word at the specified offset
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* @map: MTD map state
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* @ofs: desired offset to read
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*/
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static map_word gf_read(struct map_info *map, unsigned long ofs)
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{
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struct async_state *state = gf_map_info_to_state(map);
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uint16_t word;
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map_word test;
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gf_set_gpios(state, ofs);
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word = readw(map->virt + (ofs & win_mask(state->win_order)));
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test.x[0] = word;
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return test;
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}
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/**
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* gf_copy_from() - copy a chunk of data from the flash
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* @map: MTD map state
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* @to: memory to copy to
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* @from: flash offset to copy from
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* @len: how much to copy
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*
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* The "from" region may straddle more than one window, so toggle the GPIOs for
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* each window region before reading its data.
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*/
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static void gf_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
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{
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struct async_state *state = gf_map_info_to_state(map);
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int this_len;
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while (len) {
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this_len = from & win_mask(state->win_order);
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this_len = BIT(state->win_order) - this_len;
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this_len = min_t(int, len, this_len);
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gf_set_gpios(state, from);
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memcpy_fromio(to,
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map->virt + (from & win_mask(state->win_order)),
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this_len);
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len -= this_len;
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from += this_len;
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to += this_len;
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}
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}
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/**
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* gf_write() - write a word at the specified offset
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* @map: MTD map state
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* @ofs: desired offset to write
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*/
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static void gf_write(struct map_info *map, map_word d1, unsigned long ofs)
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{
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struct async_state *state = gf_map_info_to_state(map);
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uint16_t d;
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gf_set_gpios(state, ofs);
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d = d1.x[0];
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writew(d, map->virt + (ofs & win_mask(state->win_order)));
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}
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/**
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* gf_copy_to() - copy a chunk of data to the flash
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* @map: MTD map state
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* @to: flash offset to copy to
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* @from: memory to copy from
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* @len: how much to copy
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*
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* See gf_copy_from() caveat.
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*/
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static void gf_copy_to(struct map_info *map, unsigned long to,
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const void *from, ssize_t len)
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{
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struct async_state *state = gf_map_info_to_state(map);
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int this_len;
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while (len) {
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this_len = to & win_mask(state->win_order);
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this_len = BIT(state->win_order) - this_len;
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this_len = min_t(int, len, this_len);
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gf_set_gpios(state, to);
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memcpy_toio(map->virt + (to & win_mask(state->win_order)),
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from, len);
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len -= this_len;
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to += this_len;
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from += this_len;
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}
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}
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static const char * const part_probe_types[] = {
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"cmdlinepart", "RedBoot", NULL };
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/**
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* gpio_flash_probe() - setup a mapping for a GPIO assisted flash
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* @pdev: platform device
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*
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* The platform resource layout expected looks something like:
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* struct mtd_partition partitions[] = { ... };
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* struct physmap_flash_data flash_data = { ... };
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* static struct gpiod_lookup_table addr_flash_gpios = {
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* .dev_id = "gpio-addr-flash.0",
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* .table = {
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* GPIO_LOOKUP_IDX("gpio.0", 15, "addr", 0, GPIO_ACTIVE_HIGH),
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* GPIO_LOOKUP_IDX("gpio.0", 16, "addr", 1, GPIO_ACTIVE_HIGH),
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* );
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* };
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* gpiod_add_lookup_table(&addr_flash_gpios);
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*
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* struct resource flash_resource[] = {
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* {
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* .name = "cfi_probe",
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* .start = 0x20000000,
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* .end = 0x201fffff,
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* .flags = IORESOURCE_MEM,
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* },
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* };
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* struct platform_device flash_device = {
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* .name = "gpio-addr-flash",
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* .dev = { .platform_data = &flash_data, },
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* .num_resources = ARRAY_SIZE(flash_resource),
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* .resource = flash_resource,
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* ...
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* };
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*/
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static int gpio_flash_probe(struct platform_device *pdev)
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{
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struct physmap_flash_data *pdata;
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struct resource *memory;
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struct async_state *state;
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pdata = dev_get_platdata(&pdev->dev);
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memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!memory)
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return -EINVAL;
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state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
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if (!state)
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return -ENOMEM;
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state->gpios = devm_gpiod_get_array(&pdev->dev, "addr", GPIOD_OUT_LOW);
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if (IS_ERR(state->gpios))
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return PTR_ERR(state->gpios);
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state->win_order = get_bitmask_order(resource_size(memory)) - 1;
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state->map.name = DRIVER_NAME;
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state->map.read = gf_read;
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state->map.copy_from = gf_copy_from;
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state->map.write = gf_write;
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state->map.copy_to = gf_copy_to;
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state->map.bankwidth = pdata->width;
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state->map.size = BIT(state->win_order + state->gpios->ndescs);
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state->map.virt = devm_ioremap_resource(&pdev->dev, memory);
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if (IS_ERR(state->map.virt))
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return PTR_ERR(state->map.virt);
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state->map.phys = NO_XIP;
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state->map.map_priv_1 = (unsigned long)state;
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platform_set_drvdata(pdev, state);
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dev_notice(&pdev->dev, "probing %d-bit flash bus\n",
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state->map.bankwidth * 8);
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state->mtd = do_map_probe(memory->name, &state->map);
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if (!state->mtd)
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return -ENXIO;
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state->mtd->dev.parent = &pdev->dev;
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mtd_device_parse_register(state->mtd, part_probe_types, NULL,
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pdata->parts, pdata->nr_parts);
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return 0;
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}
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static int gpio_flash_remove(struct platform_device *pdev)
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{
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struct async_state *state = platform_get_drvdata(pdev);
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mtd_device_unregister(state->mtd);
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map_destroy(state->mtd);
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return 0;
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}
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static struct platform_driver gpio_flash_driver = {
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.probe = gpio_flash_probe,
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.remove = gpio_flash_remove,
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.driver = {
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.name = DRIVER_NAME,
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},
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};
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module_platform_driver(gpio_flash_driver);
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MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
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MODULE_DESCRIPTION("MTD map driver for flashes addressed physically and with gpios");
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MODULE_LICENSE("GPL");
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@ -13,6 +13,14 @@
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*
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* Revised to handle newer style flash binding by:
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* Copyright (C) 2007 David Gibson, IBM Corporation.
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*
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* GPIO address extension:
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* Handle the case where a flash device is mostly addressed using physical
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* line and supplemented by GPIOs. This way you can hook up say a 8MiB flash
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* to a 2MiB memory range and use the GPIOs to select a particular range.
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*
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* Copyright © 2000 Nicolas Pitre <nico@cam.org>
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* Copyright © 2005-2009 Analog Devices Inc.
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*/
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#include <linux/module.h>
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@ -30,6 +38,7 @@
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#include <linux/mtd/cfi_endian.h>
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#include <linux/io.h>
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#include <linux/of_device.h>
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#include <linux/gpio/consumer.h>
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#include "physmap-gemini.h"
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#include "physmap-versatile.h"
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@ -45,6 +54,9 @@ struct physmap_flash_info {
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const char * const *part_types;
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unsigned int nparts;
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const struct mtd_partition *parts;
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struct gpio_descs *gpios;
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unsigned int gpio_values;
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unsigned int win_order;
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};
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static int physmap_flash_remove(struct platform_device *dev)
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@ -104,6 +116,119 @@ static void physmap_set_vpp(struct map_info *map, int state)
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spin_unlock_irqrestore(&info->vpp_lock, flags);
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}
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#if IS_ENABLED(CONFIG_MTD_PHYSMAP_GPIO_ADDR)
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static void physmap_set_addr_gpios(struct physmap_flash_info *info,
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unsigned long ofs)
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{
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unsigned int i;
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ofs >>= info->win_order;
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if (info->gpio_values == ofs)
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return;
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for (i = 0; i < info->gpios->ndescs; i++) {
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if ((BIT(i) & ofs) == (BIT(i) & info->gpio_values))
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continue;
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gpiod_set_value(info->gpios->desc[i], !!(BIT(i) & ofs));
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}
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}
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#define win_mask(order) (BIT(order) - 1)
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static map_word physmap_addr_gpios_read(struct map_info *map,
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unsigned long ofs)
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{
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struct platform_device *pdev;
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struct physmap_flash_info *info;
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map_word mw;
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u16 word;
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pdev = (struct platform_device *)map->map_priv_1;
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info = platform_get_drvdata(pdev);
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physmap_set_addr_gpios(info, ofs);
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word = readw(map->virt + (ofs & win_mask(info->win_order)));
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mw.x[0] = word;
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return mw;
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}
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static void physmap_addr_gpios_copy_from(struct map_info *map, void *buf,
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unsigned long ofs, ssize_t len)
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{
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struct platform_device *pdev;
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struct physmap_flash_info *info;
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pdev = (struct platform_device *)map->map_priv_1;
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info = platform_get_drvdata(pdev);
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while (len) {
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unsigned int winofs = ofs & win_mask(info->win_order);
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unsigned int chunklen = min_t(unsigned int, len,
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BIT(info->win_order) - winofs);
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physmap_set_addr_gpios(info, ofs);
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memcpy_fromio(buf, map->virt + winofs, chunklen);
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len -= chunklen;
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buf += chunklen;
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ofs += chunklen;
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}
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}
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static void physmap_addr_gpios_write(struct map_info *map, map_word mw,
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unsigned long ofs)
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{
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struct platform_device *pdev;
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struct physmap_flash_info *info;
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u16 word;
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pdev = (struct platform_device *)map->map_priv_1;
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info = platform_get_drvdata(pdev);
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physmap_set_addr_gpios(info, ofs);
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word = mw.x[0];
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writew(word, map->virt + (ofs & win_mask(info->win_order)));
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}
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static void physmap_addr_gpios_copy_to(struct map_info *map, unsigned long ofs,
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const void *buf, ssize_t len)
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{
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struct platform_device *pdev;
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struct physmap_flash_info *info;
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pdev = (struct platform_device *)map->map_priv_1;
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info = platform_get_drvdata(pdev);
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while (len) {
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unsigned int winofs = ofs & win_mask(info->win_order);
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unsigned int chunklen = min_t(unsigned int, len,
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BIT(info->win_order) - winofs);
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physmap_set_addr_gpios(info, ofs);
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memcpy_toio(map->virt + winofs, buf, chunklen);
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len -= chunklen;
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buf += chunklen;
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ofs += chunklen;
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}
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||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
if (dev->dev.of_node)
|
||||
err = physmap_flash_of_init(dev);
|
||||
else
|
||||
@ -369,10 +504,20 @@ 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) {
|
||||
@ -497,6 +642,7 @@ 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 */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user