From 03c22449c5b7daff0a43291b34564a52660b83b8 Mon Sep 17 00:00:00 2001 From: Zhuoyu Zhang Date: Mon, 17 Aug 2015 18:55:12 +0800 Subject: arm/ls102xa:add hwconfig setting to support disable unused devices 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 Reviewed-by: York Sun --- drivers/misc/Makefile | 1 + drivers/misc/fsl_devdis.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) create mode 100644 drivers/misc/fsl_devdis.c (limited to 'drivers/misc') diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 5218b91c0b..8d0fc3c5cb 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -35,3 +35,4 @@ obj-$(CONFIG_FSL_IFC) += fsl_ifc.o obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o obj-$(CONFIG_PCA9551_LED) += pca9551_led.o obj-$(CONFIG_RESET) += reset-uclass.o +obj-$(CONFIG_FSL_DEVICE_DISABLE) += fsl_devdis.o diff --git a/drivers/misc/fsl_devdis.c b/drivers/misc/fsl_devdis.c new file mode 100644 index 0000000000..996f45c281 --- /dev/null +++ b/drivers/misc/fsl_devdis.c @@ -0,0 +1,29 @@ +/* + * Copyright 2015 Freescale Semiconductor, Inc. + * Author: Zhuoyu Zhang + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include +#include +#include +#include +#include +#include +#include + +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); + } +} + -- cgit v1.2.1