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bootcount: add uclass for bootcount

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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 <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich
2018-11-27 23:00:18 +01:00
parent f338cca1d2
commit ebb73de168
6 changed files with 182 additions and 0 deletions
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48
include/bootcount.h
View File

@@ -10,6 +10,54 @@
#include <asm/io.h>
#include <asm/byteorder.h>
#ifdef CONFIG_DM_BOOTCOUNT
struct bootcount_ops {
/**
* get() - get the current bootcount value
*
* Returns the current counter value of the bootcount backing
* store.
*
* @dev: Device to read from
* @bootcount: Address to put the current bootcount value
*/
int (*get)(struct udevice *dev, u32 *bootcount);
/**
* set() - set a bootcount value (e.g. to reset or increment)
*
* Sets the value in the bootcount backing store.
*
* @dev: Device to read from
* @bootcount: New bootcount value to store
*/
int (*set)(struct udevice *dev, const u32 bootcount);
};
/* Access the operations for a bootcount device */
#define bootcount_get_ops(dev) ((struct bootcount_ops *)(dev)->driver->ops)
/**
* dm_bootcount_get() - Read the current value from a bootcount storage
*
* @dev: Device to read from
* @bootcount: Place to put the current bootcount
* @return 0 if OK, -ve on error
*/
int dm_bootcount_get(struct udevice *dev, u32 *bootcount);
/**
* dm_bootcount_set() - Write a value to a bootcount storage
*
* @dev: Device to read from
* @bootcount: Value to be written to the backing storage
* @return 0 if OK, -ve on error
*/
int dm_bootcount_set(struct udevice *dev, u32 bootcount);
#endif
#if defined(CONFIG_SPL_BOOTCOUNT_LIMIT) || defined(CONFIG_BOOTCOUNT_LIMIT)
#if !defined(CONFIG_SYS_BOOTCOUNT_LE) && !defined(CONFIG_SYS_BOOTCOUNT_BE)