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Message-Id: <20181004133147.20215-2-ricardo.ribalda@gmail.com>
Date: Thu, 4 Oct 2018 15:31:47 +0200
From: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To: David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Boris Brezillon <boris.brezillon@...tlin.com>,
Marek Vasut <marek.vasut@...il.com>,
Richard Weinberger <richard@....at>,
Zhouyang Jia <jiazhouyang09@...il.com>,
linux-mtd@...ts.infradead.org,
open list <linux-kernel@...r.kernel.org>
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v8 10/10] mtd: maps: gpio-addr-flash: Add support for device-tree devices
Allow creating gpio-addr-flash via device-tree and not just via platform
data.
Mimic what physmap_of_versatile and physmap_of_gemini does to reduce
code duplicity.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
drivers/mtd/maps/Kconfig | 8 +++
drivers/mtd/maps/Makefile | 3 +-
drivers/mtd/maps/gpio-addr-flash.c | 91 ++++++++++++++++++------------
drivers/mtd/maps/gpio-addr-flash.h | 31 ++++++++++
drivers/mtd/maps/physmap_of_core.c | 5 ++
drivers/mtd/maps/physmap_of_gpio.c | 24 ++++++++
6 files changed, 125 insertions(+), 37 deletions(-)
create mode 100644 drivers/mtd/maps/gpio-addr-flash.h
create mode 100644 drivers/mtd/maps/physmap_of_gpio.c
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index afb36bff13a7..427143d42168 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -94,6 +94,14 @@ config MTD_PHYSMAP_OF_GEMINI
platforms, some detection and setting up parallel mode on the
external interface.
+config MTD_PHYSMAP_OF_GPIO
+ bool "GPIO-assisted OF-based physical memory map handling"
+ depends on MTD_PHYSMAP_OF
+ depends on MTD_GPIO_ADDR
+ help
+ This provides some extra DT physmap parsing for flashes that are
+ 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
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 51acf1fec19b..c232ccf05bee 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -21,6 +21,7 @@ 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-$(CONFIG_MTD_PHYSMAP_OF_GEMINI) += physmap_of_gemini.o
+physmap_of-objs-$(CONFIG_MTD_PHYSMAP_OF_GPIO) += physmap_of_gpio.o
physmap_of-objs := $(physmap_of-objs-y)
obj-$(CONFIG_MTD_PHYSMAP_OF) += physmap_of.o
obj-$(CONFIG_MTD_PISMO) += pismo.o
@@ -44,6 +45,6 @@ obj-$(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-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
obj-$(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
index a20e85aa770e..7837fc7b8de8 100644
--- a/drivers/mtd/maps/gpio-addr-flash.c
+++ b/drivers/mtd/maps/gpio-addr-flash.c
@@ -25,25 +25,25 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include "gpio-addr-flash.h"
#define win_mask(x) ((BIT(x)) - 1)
#define DRIVER_NAME "gpio-addr-flash"
+#define gf_map_info_to_state(mi) ((struct async_state *)(mi)->map_priv_1)
+
/**
- * struct async_state - keep GPIO flash state
+ * struct async_state_pdev - Async state platform device
* @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)
+ * @state: GPIO flash state
*/
-struct async_state {
+struct async_state_pdev {
struct mtd_info *mtd;
struct map_info map;
- struct gpio_descs *gpios;
- unsigned int gpio_values;
- unsigned int win_order;
+ struct async_state state;
};
#define gf_map_info_to_state(mi) ((struct async_state *)(mi)->map_priv_1)
@@ -174,6 +174,31 @@ static void gf_copy_to(struct map_info *map, unsigned long to,
static const char * const part_probe_types[] = {
"cmdlinepart", "RedBoot", NULL };
+int gpio_flash_probe_common(struct device *dev, struct async_state *state,
+ struct map_info *map)
+{
+ if (!is_power_of_2(map->size)) {
+ dev_err(dev, "Window size must be aligned\n");
+ return -EIO;
+ }
+
+ state->gpios = devm_gpiod_get_array(dev, "addr", GPIOD_OUT_LOW);
+ if (IS_ERR(state->gpios))
+ return PTR_ERR(state->gpios);
+
+ state->win_order = get_bitmask_order(map->size) - 1;
+ map->read = gf_read;
+ map->copy_from = gf_copy_from;
+ map->write = gf_write;
+ map->copy_to = gf_copy_to;
+ map->size = BIT(state->win_order + state->gpios->ndescs);
+ map->phys = NO_XIP;
+ map->map_priv_1 = (unsigned long)state;
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_flash_probe_common);
+
/**
* gpio_flash_probe() - setup a mapping for a GPIO assisted flash
* @pdev: platform device
@@ -210,7 +235,8 @@ static int gpio_flash_probe(struct platform_device *pdev)
{
struct physmap_flash_data *pdata;
struct resource *memory;
- struct async_state *state;
+ struct async_state_pdev *state_pdev;
+ int ret;
pdata = dev_get_platdata(&pdev->dev);
memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -218,40 +244,33 @@ static int gpio_flash_probe(struct platform_device *pdev)
if (!memory)
return -EINVAL;
- state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
- if (!state)
+ state_pdev = devm_kzalloc(&pdev->dev, sizeof(*state_pdev), GFP_KERNEL);
+ if (!state_pdev)
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_pdev->map.virt = devm_ioremap_resource(&pdev->dev, memory);
+ if (IS_ERR(state_pdev->map.virt))
+ return PTR_ERR(state_pdev->map.virt);
- 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_pdev->map.name = DRIVER_NAME;
+ state_pdev->map.bankwidth = pdata->width;
+ state_pdev->map.size = resource_size(memory);
- state->map.phys = NO_XIP;
- state->map.map_priv_1 = (unsigned long)state;
+ ret = gpio_flash_probe_common(&pdev->dev, &state_pdev->state,
+ &state_pdev->map);
+ if (ret)
+ return ret;
- platform_set_drvdata(pdev, state);
+ platform_set_drvdata(pdev, state_pdev);
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)
+ state_pdev->map.bankwidth * 8);
+ state_pdev->mtd = do_map_probe(memory->name, &state_pdev->map);
+ if (!state_pdev->mtd)
return -ENXIO;
- state->mtd->dev.parent = &pdev->dev;
+ state_pdev->mtd->dev.parent = &pdev->dev;
- mtd_device_parse_register(state->mtd, part_probe_types, NULL,
+ mtd_device_parse_register(state_pdev->mtd, part_probe_types, NULL,
pdata->parts, pdata->nr_parts);
return 0;
@@ -259,10 +278,10 @@ static int gpio_flash_probe(struct platform_device *pdev)
static int gpio_flash_remove(struct platform_device *pdev)
{
- struct async_state *state = platform_get_drvdata(pdev);
+ struct async_state_pdev *state_pdev = platform_get_drvdata(pdev);
- mtd_device_unregister(state->mtd);
- map_destroy(state->mtd);
+ mtd_device_unregister(state_pdev->mtd);
+ map_destroy(state_pdev->mtd);
return 0;
}
diff --git a/drivers/mtd/maps/gpio-addr-flash.h b/drivers/mtd/maps/gpio-addr-flash.h
new file mode 100644
index 000000000000..46d97a8031eb
--- /dev/null
+++ b/drivers/mtd/maps/gpio-addr-flash.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/of.h>
+#include <linux/mtd/map.h>
+
+/**
+ * struct async_state - keep GPIO flash state
+ * @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 gpio_descs *gpios;
+ unsigned int gpio_values;
+ unsigned int win_order;
+};
+
+int gpio_flash_probe_common(struct device *dev,
+ struct async_state *state,
+ struct map_info *map);
+
+#ifdef CONFIG_MTD_PHYSMAP_OF_GPIO
+int of_flash_probe_gpio(struct platform_device *pdev, struct device_node *np,
+ struct map_info *map);
+#else
+static inline
+int of_flash_probe_gpio(struct platform_device *pdev, struct device_node *np,
+ struct map_info *map)
+{
+ return 0;
+}
+#endif
diff --git a/drivers/mtd/maps/physmap_of_core.c b/drivers/mtd/maps/physmap_of_core.c
index ed75f1781c37..1e9f2d6f77c3 100644
--- a/drivers/mtd/maps/physmap_of_core.c
+++ b/drivers/mtd/maps/physmap_of_core.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include "physmap_of_gemini.h"
#include "physmap_of_versatile.h"
+#include "gpio-addr-flash.h"
struct of_flash_list {
struct mtd_info *mtd;
@@ -240,6 +241,10 @@ static int of_flash_probe(struct platform_device *dev)
simple_map_init(&info->list[i].map);
+ err = of_flash_probe_gpio(dev, dp, &info->list[i].map);
+ if (err)
+ goto err_out;
+
/*
* On some platforms (e.g. MPC5200) a direct 1:1 mapping
* may cause problems with JFFS2 usage, as the local bus (LPB)
diff --git a/drivers/mtd/maps/physmap_of_gpio.c b/drivers/mtd/maps/physmap_of_gpio.c
new file mode 100644
index 000000000000..97e02737ed67
--- /dev/null
+++ b/drivers/mtd/maps/physmap_of_gpio.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2018 Qtechnology A/S
+ *
+ * Ricardo Ribalda <ricardo.ribalda@...il.com>
+ *
+ */
+#include <linux/platform_device.h>
+#include "gpio-addr-flash.h"
+
+int of_flash_probe_gpio(struct platform_device *pdev, struct device_node *np,
+ struct map_info *map)
+{
+ struct async_state *state;
+
+ if (!of_device_is_compatible(np, "mtd,gpio-addr-flash"))
+ return 0;
+
+ state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ return gpio_flash_probe_common(&pdev->dev, state, map);
+}
--
2.19.0
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