mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 23:24:38 +00:00
989ce04999
Add bcm281xx architecture support code including a clock framework and chip reset. Define register block base addresses for the bcm281xx architecture and create an empty gpio header file required when CONFIG_CMD_GPIO is set. Signed-off-by: Darwin Rambo <drambo@broadcom.com> Reviewed-by: Steve Rae <srae@broadcom.com> Reviewed-by: Tim Kryger <tkryger@linaro.org>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
|
|
* Copyright 2013 Broadcom Corporation.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* Bitfield operations
|
|
*
|
|
* These are generic bitfield operations which allow manipulation of variable
|
|
* width bitfields within a word. One use of this would be to use data tables
|
|
* to determine how to reprogram fields within R/W hardware registers.
|
|
*
|
|
* Example:
|
|
*
|
|
* old_reg_val
|
|
* +--------+----+---+--+-----+----------+
|
|
* | | | | | old | |
|
|
* +--------+----+---+--+-----+----------+
|
|
*
|
|
* new_reg_val
|
|
* +--------+----+---+--+-----+----------+
|
|
* | | | | | new | |
|
|
* +--------+----+---+--+-----+----------+
|
|
*
|
|
* mask = bitfield_mask(10, 5);
|
|
* old = bitfield_extract(old_reg_val, 10, 5);
|
|
* new_reg_val = bitfield_replace(old_reg_val, 10, 5, new);
|
|
*
|
|
* The numbers 10 and 5 could for example come from data
|
|
* tables which describe all bitfields in all registers.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* Produces a mask of set bits covering a range of a uint value */
|
|
static inline uint bitfield_mask(uint shift, uint width)
|
|
{
|
|
return ((1 << width) - 1) << shift;
|
|
}
|
|
|
|
/* Extract the value of a bitfield found within a given register value */
|
|
static inline uint bitfield_extract(uint reg_val, uint shift, uint width)
|
|
{
|
|
return (reg_val & bitfield_mask(shift, width)) >> shift;
|
|
}
|
|
|
|
/*
|
|
* Replace the value of a bitfield found within a given register value
|
|
* Returns the newly modified uint value with the replaced field.
|
|
*/
|
|
static inline uint bitfield_replace(uint reg_val, uint shift, uint width,
|
|
uint bitfield_val)
|
|
{
|
|
uint mask = bitfield_mask(shift, width);
|
|
|
|
return (reg_val & ~mask) | (bitfield_val << shift);
|
|
}
|