From ebb73de1687cfd6449f492b54cc2f32b4b0ce9c5 Mon Sep 17 00:00:00 2001 From: Philipp Tomsich Date: Tue, 27 Nov 2018 23:00:18 +0100 Subject: bootcount: add uclass for bootcount The original bootcount methods do not provide an interface to DM and rely on a static configuration for I2C devices (e.g. bus, chip-addr, etc. are configured through defines statically). On a modern system that exposes multiple devices in a DTS-configurable way, this is less than optimal and a interface to DM-based devices will be desirable. This adds a simple driver that is DM-aware and configurable via DTS. If ambiguous (i.e. multiple bootcount-devices are present) the /chosen/u-boot,bootcount-device property can be used to select one bootcount device. Initially, this provides support for the following DM devices: * RTC devices Signed-off-by: Philipp Tomsich Tested-by: Klaus Goger --- drivers/bootcount/bootcount-uclass.c | 93 ++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 drivers/bootcount/bootcount-uclass.c (limited to 'drivers/bootcount/bootcount-uclass.c') diff --git a/drivers/bootcount/bootcount-uclass.c b/drivers/bootcount/bootcount-uclass.c new file mode 100644 index 00000000000..0689db7a5bc --- /dev/null +++ b/drivers/bootcount/bootcount-uclass.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH + */ + +#include +#include +#include +#include + +int dm_bootcount_get(struct udevice *dev, u32 *bootcount) +{ + struct bootcount_ops *ops = bootcount_get_ops(dev); + + assert(ops); + if (!ops->get) + return -ENOSYS; + return ops->get(dev, bootcount); +} + +int dm_bootcount_set(struct udevice *dev, const u32 bootcount) +{ + struct bootcount_ops *ops = bootcount_get_ops(dev); + + assert(ops); + if (!ops->set) + return -ENOSYS; + return ops->set(dev, bootcount); +} + +/* Now implement the generic default functions */ +void bootcount_store(ulong val) +{ + struct udevice *dev = NULL; + ofnode node; + const char *propname = "u-boot,bootcount-device"; + int ret = -ENODEV; + + /* + * If there's a preferred bootcount device selected by the user (by + * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use + * it if available. + */ + node = ofnode_get_chosen_node(propname); + if (ofnode_valid(node)) + ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); + + /* If there was no user-selected device, use the first available one */ + if (ret) + ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); + + if (dev) + ret = dm_bootcount_set(dev, val); + + if (ret) + pr_debug("%s: failed to store 0x%lx\n", __func__, val); +} + +ulong bootcount_load(void) +{ + struct udevice *dev = NULL; + ofnode node; + const char *propname = "u-boot,bootcount-device"; + int ret = -ENODEV; + u32 val; + + /* + * If there's a preferred bootcount device selected by the user (by + * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use + * it if available. + */ + node = ofnode_get_chosen_node(propname); + if (ofnode_valid(node)) + ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); + + /* If there was no user-selected device, use the first available one */ + if (ret) + ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); + + if (dev) + ret = dm_bootcount_get(dev, &val); + + if (ret) + pr_debug("%s: failed to load bootcount\n", __func__); + + /* Return the 0, if the call to dm_bootcount_get failed */ + return ret ? 0 : val; +} + +UCLASS_DRIVER(bootcount) = { + .name = "bootcount", + .id = UCLASS_BOOTCOUNT, +}; -- cgit v1.2.3