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| author | Zhuoyu Zhang <Zhuoyu.Zhang@freescale.com> | 2015-08-17 18:55:12 +0800 |
|---|---|---|
| committer | York Sun <yorksun@freescale.com> | 2015-09-01 21:49:20 -0500 |
| commit | 03c22449c5b7daff0a43291b34564a52660b83b8 (patch) | |
| tree | 5925e5f7cbbcc63e89d40674300b635936d1b94a /drivers/misc | |
| parent | ec93af0dec4c9f17cefadd24d54edf5c5b91bc8d (diff) | |
| download | u-boot-imx-03c22449c5b7daff0a43291b34564a52660b83b8.zip u-boot-imx-03c22449c5b7daff0a43291b34564a52660b83b8.tar.gz u-boot-imx-03c22449c5b7daff0a43291b34564a52660b83b8.tar.bz2 | |
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 <Zhuoyu.Zhang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/fsl_devdis.c | 29 |
2 files changed, 30 insertions, 0 deletions
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 5218b91..8d0fc3c 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 0000000..996f45c --- /dev/null +++ b/drivers/misc/fsl_devdis.c @@ -0,0 +1,29 @@ +/* + * 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); + } +} + |