We might want to access data stored onto EEPROMs. Create a framework to provide a consistent API.
Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com --- drivers/Kconfig | 2 +- drivers/Makefile | 1 +- drivers/eeprom/Kconfig | 17 ++++++++++- drivers/eeprom/Makefile | 2 +- drivers/eeprom/eeprom-uclass.c | 57 +++++++++++++++++++++++++++++++++++- include/dm/uclass-id.h | 1 +- include/eeprom.h | 21 +++++++++++++- 7 files changed, 101 insertions(+), 0 deletions(-) create mode 100644 drivers/eeprom/Kconfig create mode 100644 drivers/eeprom/Makefile create mode 100644 drivers/eeprom/eeprom-uclass.c create mode 100644 include/eeprom.h
diff --git a/drivers/Kconfig b/drivers/Kconfig index 74194b0d6f7f..e518752eae1a 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -20,6 +20,8 @@ source "drivers/dfu/Kconfig"
source "drivers/dma/Kconfig"
+source "drivers/eeprom/Kconfig" + source "drivers/fpga/Kconfig"
source "drivers/gpio/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 543c43bb0d23..c8f285f66bb3 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -64,6 +64,7 @@ obj-y += block/ obj-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount/ obj-$(CONFIG_CPU) += cpu/ obj-y += crypto/ +obj-y += eeprom/ obj-$(CONFIG_FPGA) += fpga/ obj-y += hwmon/ obj-y += misc/ diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig new file mode 100644 index 000000000000..8dc597a8d894 --- /dev/null +++ b/drivers/eeprom/Kconfig @@ -0,0 +1,17 @@ +# +# EEPROM subsystem configuration +# + +menu "EEPROM support" + +config EEPROM + bool "Enable EEPROM support" + depends on DM + help + Support for the EEPROMs + +if EEPROM + +endif + +endmenu diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile new file mode 100644 index 000000000000..147dba5ec4b8 --- /dev/null +++ b/drivers/eeprom/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_EEPROM) += eeprom-uclass.o + diff --git a/drivers/eeprom/eeprom-uclass.c b/drivers/eeprom/eeprom-uclass.c new file mode 100644 index 000000000000..020b0087d22c --- /dev/null +++ b/drivers/eeprom/eeprom-uclass.c @@ -0,0 +1,57 @@ +/* + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co. + * + * Maxime Ripard maxime.ripard@free-electrons.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <eeprom.h> + +#include <dm/device-internal.h> + +int eeprom_read_buf(struct udevice *dev, unsigned offset, + u8 *buf, unsigned count) +{ + const struct eeprom_ops *ops = device_get_ops(dev); + + if (!ops->read_buf) + return -ENOSYS; + + return ops->read_buf(dev, offset, buf, count); +} + + +UCLASS_DRIVER(eeprom) = { + .name = "eeprom", + .id = UCLASS_EEPROM, +}; + +int eeprom_dm_init(void) +{ + struct udevice *bus; + struct uclass *uc; + int ret; + + ret = uclass_get(UCLASS_EEPROM, &uc); + if (ret) + return ret; + + uclass_foreach_dev(bus, uc) { + ret = device_probe(bus); + if (ret == -ENODEV) { /* No such device. */ + printf("EEPROM not available.\n"); + continue; + } + + if (ret) { /* Other error. */ + printf("EEPROM probe failed, error %d\n", ret); + continue; + } + } + + return 0; +} diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index b88adcbe802f..909a32404259 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -83,6 +83,7 @@ enum uclass_id { UCLASS_VIDEO_BRIDGE, /* Video bridge, e.g. DisplayPort to LVDS */ UCLASS_VIDEO_CONSOLE, /* Text console driver for video device */ UCLASS_W1, /* Dallas 1-Wire bus */ + UCLASS_EEPROM, /* EEPROM */
UCLASS_COUNT, UCLASS_INVALID = -1, diff --git a/include/eeprom.h b/include/eeprom.h new file mode 100644 index 000000000000..648c8606c35a --- /dev/null +++ b/include/eeprom.h @@ -0,0 +1,21 @@ +/* + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __EEPROM_H +#define __EEPROM_H + +#include <dm.h> + +struct eeprom_ops { + int (*read_buf)(struct udevice *dev, unsigned offset, + u8 *buf, unsigned count); +}; + +int eeprom_read_buf(struct udevice *dev, unsigned offset, + u8 *buf, unsigned count); + +#endif