Add a driver model uclass for SPI flash which supports the common operations (read, write, erase). Since we must keep support for the non-dm interface, some modification of the spi_flash header is required.
CONFIG_DM_SPI_FLASH is used to enable driver model for SPI flash.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Jagannadha Sutradharudu Teki jagannadh.teki@gmail.com ---
Changes in v4: None Changes in v3: None Changes in v2: None
drivers/mtd/spi/Makefile | 7 ++++- drivers/mtd/spi/sf-uclass.c | 63 ++++++++++++++++++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/spi_flash.h | 70 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 140 insertions(+), 1 deletion(-) create mode 100644 drivers/mtd/spi/sf-uclass.c
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile index 9e18fb4..15789a0 100644 --- a/drivers/mtd/spi/Makefile +++ b/drivers/mtd/spi/Makefile @@ -5,13 +5,18 @@ # SPDX-License-Identifier: GPL-2.0+ #
+obj-$(CONFIG_DM_SPI_FLASH) += sf-uclass.o + ifdef CONFIG_SPL_BUILD obj-$(CONFIG_SPL_SPI_LOAD) += spi_spl_load.o obj-$(CONFIG_SPL_SPI_BOOT) += fsl_espi_spl.o endif
+#ifndef CONFIG_DM_SPI +obj-$(CONFIG_SPI_FLASH) += sf_probe.o +#endif obj-$(CONFIG_CMD_SF) += sf.o -obj-$(CONFIG_SPI_FLASH) += sf_params.o sf_probe.o sf_ops.o +obj-$(CONFIG_SPI_FLASH) += sf_ops.o sf_params.o obj-$(CONFIG_SPI_FRAM_RAMTRON) += ramtron.o obj-$(CONFIG_SPI_FLASH_SANDBOX) += sandbox.o obj-$(CONFIG_SPI_M95XXX) += eeprom_m95xxx.o diff --git a/drivers/mtd/spi/sf-uclass.c b/drivers/mtd/spi/sf-uclass.c new file mode 100644 index 0000000..376d815 --- /dev/null +++ b/drivers/mtd/spi/sf-uclass.c @@ -0,0 +1,63 @@ +/* + * Copyright (c) 2014 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <spi.h> +#include <spi_flash.h> +#include <dm/device-internal.h> +#include "sf_internal.h" + +/* + * TODO(sjg@chromium.org): This is an old-style function. We should remove + * it when all SPI flash drivers use dm + */ +struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int spi_mode) +{ + struct udevice *dev; + + if (spi_flash_probe_bus_cs(bus, cs, max_hz, spi_mode, &dev)) + return NULL; + + return dev->uclass_priv; +} + +void spi_flash_free(struct spi_flash *flash) +{ + spi_flash_remove(flash->spi->dev); +} + +int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs, + unsigned int max_hz, unsigned int spi_mode, + struct udevice **devp) +{ + struct spi_slave *slave; + struct udevice *bus; + char name[20], *str; + int ret; + + snprintf(name, sizeof(name), "%d:%d", busnum, cs); + str = strdup(name); + ret = spi_get_bus_and_cs(busnum, cs, max_hz, spi_mode, + "spi_flash_std", str, &bus, &slave); + if (ret) + return ret; + + *devp = slave->dev; + return 0; +} + +int spi_flash_remove(struct udevice *dev) +{ + return device_remove(dev); +} + +UCLASS_DRIVER(spi_flash) = { + .id = UCLASS_SPI_FLASH, + .name = "spi_flash", + .per_device_auto_alloc_size = sizeof(struct spi_flash), +}; diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index 6e56382..c92adb4 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -25,6 +25,7 @@ enum uclass_id { UCLASS_SERIAL, /* Serial UART */ UCLASS_SPI, /* SPI bus */ UCLASS_SPI_GENERIC, /* Generic SPI flash target */ + UCLASS_SPI_FLASH, /* SPI flash */
UCLASS_COUNT, UCLASS_INVALID = -1, diff --git a/include/spi_flash.h b/include/spi_flash.h index 223e442..5913b39 100644 --- a/include/spi_flash.h +++ b/include/spi_flash.h @@ -15,6 +15,7 @@ #ifndef _SPI_FLASH_H_ #define _SPI_FLASH_H_
+#include <dm.h> /* Because we dereference struct udevice here */ #include <linux/types.h>
#ifndef CONFIG_SF_DEFAULT_SPEED @@ -61,7 +62,12 @@ struct spi_slave; * return 0 - Success, 1 - Failure */ struct spi_flash { +#ifdef CONFIG_DM_SPI_FLASH struct spi_slave *spi; + struct udevice *dev; +#else + struct spi_slave *spi; +#endif const char *name; u8 dual_flash; u8 shift; @@ -82,12 +88,75 @@ struct spi_flash { u8 dummy_byte;
void *memory_map; +#ifndef CONFIG_DM_SPI_FLASH + /* + * These are not strictly needed for driver model, but keep them here + * whilt the transition is in progress. + * + * Normally each driver would provide its own operations, but for + * SPI flash most chips use the same algorithms. One approach is + * to create a 'common' SPI flash device which knows how to talk + * to most devices, and then allow other drivers to be used instead + * if requird, perhaps with a way of scanning through the list to + * find the driver that matches the device. + */ int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf); int (*write)(struct spi_flash *flash, u32 offset, size_t len, const void *buf); int (*erase)(struct spi_flash *flash, u32 offset, size_t len); +#endif +}; + +struct dm_spi_flash_ops { + int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf); + int (*write)(struct udevice *dev, u32 offset, size_t len, + const void *buf); + int (*erase)(struct udevice *dev, u32 offset, size_t len); };
+/* Access the serial operations for a device */ +#define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops) + +#ifdef CONFIG_DM_SPI_FLASH +int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs, + unsigned int max_hz, unsigned int spi_mode, + struct udevice **devp); + +/* Compatibility function - this is the old U-Boot API */ +struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int spi_mode); + +/* Compatibility function - this is the old U-Boot API */ +void spi_flash_free(struct spi_flash *flash); + +int spi_flash_remove(struct udevice *flash); + +static inline int spi_flash_read(struct spi_flash *flash, u32 offset, + size_t len, void *buf) +{ + return sf_get_ops(flash->dev)->read(flash->dev, offset, len, buf); +} + +static inline int spi_flash_write(struct spi_flash *flash, u32 offset, + size_t len, const void *buf) +{ + return sf_get_ops(flash->dev)->write(flash->dev, offset, len, buf); +} + +static inline int spi_flash_erase(struct spi_flash *flash, u32 offset, + size_t len) +{ + return sf_get_ops(flash->dev)->erase(flash->dev, offset, len); +} + +struct sandbox_state; + +int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs, + struct udevice *bus, int of_offset, const char *spec); + +void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs); + +#else struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int spi_mode);
@@ -122,6 +191,7 @@ static inline int spi_flash_erase(struct spi_flash *flash, u32 offset, { return flash->erase(flash, offset, len); } +#endif
void spi_boot(void) __noreturn; void spi_spl_load_image(uint32_t offs, unsigned int size, void *vdst);