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https://github.com/brain-hackers/u-boot-brain
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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>
30 lines
704 B
C
30 lines
704 B
C
/*
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* Copyright 2015 Freescale Semiconductor, Inc.
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* Author: Zhuoyu Zhang <Zhuoyu.Zhang@freescale.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch-ls102xa/immap_ls102xa.h>
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#include <asm/arch-ls102xa/config.h>
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#include <linux/compiler.h>
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#include <hwconfig.h>
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#include <fsl_devdis.h>
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void device_disable(const struct devdis_table *tbl, uint32_t num)
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{
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int i;
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struct ccsr_gur __iomem *gur = (void *)CONFIG_SYS_FSL_GUTS_ADDR;
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/*
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* Extract hwconfig from environment and disable unused device.
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*/
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for (i = 0; i < num; i++) {
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if (hwconfig_sub("devdis", tbl[i].name))
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setbits_be32(&gur->devdisr + tbl[i].offset,
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tbl[i].mask);
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}
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}
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