mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 05:04:26 +00:00
03c22449c5
DEVDISRn registers provides a mechanism for gating clocks of IP blocks that are not used. Here we implement hwconfig option to allow users to disable unused peripherals on the board. For ex. If eSDHC/qDMA/eDMA are unused and with disabled status in dts, User can enable CONFIG_FSL_DEVICE_DISABLE and set "devdis:esdhc,qdma,edma" in hwconfig, thus ESDHC controller & eDMA/qDMA will be clock gated to save more power. Signed-off-by: Zhuoyu Zhang <Zhuoyu.Zhang@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
29 lines
704 B
C
29 lines
704 B
C
/*
|
|
* Copyright 2015 Freescale Semiconductor, Inc.
|
|
* Author: Zhuoyu Zhang <Zhuoyu.Zhang@freescale.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch-ls102xa/immap_ls102xa.h>
|
|
#include <asm/arch-ls102xa/config.h>
|
|
#include <linux/compiler.h>
|
|
#include <hwconfig.h>
|
|
#include <fsl_devdis.h>
|
|
|
|
void device_disable(const struct devdis_table *tbl, uint32_t num)
|
|
{
|
|
int i;
|
|
struct ccsr_gur __iomem *gur = (void *)CONFIG_SYS_FSL_GUTS_ADDR;
|
|
|
|
/*
|
|
* Extract hwconfig from environment and disable unused device.
|
|
*/
|
|
for (i = 0; i < num; i++) {
|
|
if (hwconfig_sub("devdis", tbl[i].name))
|
|
setbits_be32(&gur->devdisr + tbl[i].offset,
|
|
tbl[i].mask);
|
|
}
|
|
}
|
|
|