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.zh...@freescale.com>
---
arch/arm/include/asm/arch-ls102xa/ls102xa_devdis.h | 52 ++++++++++++++++++++++
board/freescale/ls1021aqds/ls1021aqds.c | 5 +++
board/freescale/ls1021atwr/ls1021atwr.c | 5 +++
drivers/misc/Makefile | 1 +
drivers/misc/fsl_devdis.c | 29 ++++++++++++
include/configs/ls1021aqds.h | 4 +-
include/configs/ls1021atwr.h | 4 +-
include/fsl_devdis.h | 18 ++++++++
8 files changed, 116 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/include/asm/arch-ls102xa/ls102xa_devdis.h
create mode 100644 drivers/misc/fsl_devdis.c
create mode 100644 include/fsl_devdis.h
diff --git a/arch/arm/include/asm/arch-ls102xa/ls102xa_devdis.h
b/arch/arm/include/asm/arch-ls102xa/ls102xa_devdis.h
new file mode 100644
index 0000000..3e9e9ea
--- /dev/null
+++ b/arch/arm/include/asm/arch-ls102xa/ls102xa_devdis.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __FSL_LS102XA_DEVDIS_H_
+#define __FSL_LS102XA_DEVDIS_H_
+
+#include <fsl_devdis.h>
+
+const struct devdis_table devdis_tbl[] = {
+ { "pbl", 0x0, 0x80000000 }, /* PBL */
+ { "esdhc", 0x0, 0x20000000 }, /* eSDHC */
+ { "qdma", 0x0, 0x800000 }, /* qDMA */
+ { "edma", 0x0, 0x400000 }, /* eDMA */
+ { "usb3", 0x0, 0x84000 }, /* USB3.0 controller and PHY*/
+ { "usb2", 0x0, 0x40000 }, /* USB2.0 controller */
+ { "sata", 0x0, 0x8000 }, /* SATA */
+ { "sec", 0x0, 0x200 }, /* SEC */
+ { "dcu", 0x0, 0x2 }, /* Display controller Unit */
+ { "qe", 0x0, 0x1 }, /* QUICC Engine */
+ { "etsec1", 0x1, 0x80000000 }, /* eTSEC1 controller */
+ { "etesc2", 0x1, 0x40000000 }, /* eTSEC2 controller */
+ { "etsec3", 0x1, 0x20000000 }, /* eTSEC3 controller */
+ { "pex1", 0x2, 0x80000000 }, /* PCIE controller 1 */
+ { "pex2", 0x2, 0x40000000 }, /* PCIE controller 2 */
+ { "duart1", 0x3, 0x20000000 }, /* DUART1 */
+ { "duart2", 0x3, 0x10000000 }, /* DUART2 */
+ { "qspi", 0x3, 0x8000000 }, /* QSPI */
+ { "ddr", 0x4, 0x80000000 }, /* DDR */
+ { "ocram1", 0x4, 0x8000000 }, /* OCRAM1 */
+ { "ifc", 0x4, 0x800000 }, /* IFC */
+ { "gpio", 0x4, 0x400000 }, /* GPIO */
+ { "dbg", 0x4, 0x200000 }, /* DBG */
+ { "can1", 0x4, 0x80000 }, /* FlexCAN1 */
+ { "can2_4", 0x4, 0x40000 }, /* FlexCAN2_3_4 */
+ { "ftm2_8", 0x4, 0x20000 }, /* FlexTimer2_3_4_5_6_7_8 */
+ { "secmon", 0x4, 0x4000 }, /* Security Monitor */
+ { "wdog1_2", 0x4, 0x400 }, /* WatchDog1_2 */
+ { "i2c2_3", 0x4, 0x200 }, /* I2C2_3 */
+ { "sai1_4", 0x4, 0x100 }, /* SAI1_2_3_4 */
+ { "lpuart2_6", 0x4, 0x80 }, /* LPUART2_3_4_5_6 */
+ { "dspi1_2", 0x4, 0x40 }, /* DSPI1_2 */
+ { "asrc", 0x4, 0x20 }, /* ASRC */
+ { "spdif", 0x4, 0x10 }, /* SPDIF */
+ { "i2c1", 0x4, 0x4 }, /* I2C1 */
+ { "lpuart1", 0x4, 0x2 }, /* LPUART1 */
+ { "ftm1", 0x4, 0x1 }, /* FlexTimer1 */
+};
+
+#endif
diff --git a/board/freescale/ls1021aqds/ls1021aqds.c
b/board/freescale/ls1021aqds/ls1021aqds.c
index d6ef6ba..a1c10cf 100644
--- a/board/freescale/ls1021aqds/ls1021aqds.c
+++ b/board/freescale/ls1021aqds/ls1021aqds.c
@@ -12,12 +12,14 @@
#include <asm/arch/clock.h>
#include <asm/arch/fsl_serdes.h>
#include <asm/arch/ls102xa_stream_id.h>
+#include <asm/arch/ls102xa_devdis.h>
#include <hwconfig.h>
#include <mmc.h>
#include <fsl_esdhc.h>
#include <fsl_ifc.h>
#include <fsl_sec.h>
#include <spl.h>
+#include <fsl_devdis.h>
#include "../common/sleep.h"
#include "../common/qixis.h"
@@ -530,6 +532,9 @@ int misc_init_r(void)
else if (hwconfig("sdhc"))
config_board_mux(MUX_TYPE_SDHC);
+#ifdef CONFIG_FSL_DEVICE_DISABLE
+ device_disable(devdis_tbl, ARRAY_SIZE(devdis_tbl));
+#endif
#ifdef CONFIG_FSL_CAAM
return sec_init();
#endif
diff --git a/board/freescale/ls1021atwr/ls1021atwr.c
b/board/freescale/ls1021atwr/ls1021atwr.c
index b7458a9..5ebe781 100644
--- a/board/freescale/ls1021atwr/ls1021atwr.c
+++ b/board/freescale/ls1021atwr/ls1021atwr.c
@@ -12,6 +12,7 @@
#include <asm/arch/clock.h>
#include <asm/arch/fsl_serdes.h>
#include <asm/arch/ls102xa_stream_id.h>
+#include <asm/arch/ls102xa_devdis.h>
#include <hwconfig.h>
#include <mmc.h>
#include <fsl_esdhc.h>
@@ -21,6 +22,7 @@
#include <fsl_mdio.h>
#include <tsec.h>
#include <fsl_sec.h>
+#include <fsl_devdis.h>
#include <spl.h>
#include "../common/sleep.h"
#ifdef CONFIG_U_QE
@@ -651,6 +653,9 @@ int board_init(void)
#if defined(CONFIG_MISC_INIT_R)
int misc_init_r(void)
{
+#ifdef CONFIG_FSL_DEVICE_DISABLE
+ device_disable(devdis_tbl, ARRAY_SIZE(devdis_tbl));
+#endif
#ifndef CONFIG_QSPI_BOOT
config_board_mux();
#endif
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..d9c36e2
--- /dev/null
+++ b/drivers/misc/fsl_devdis.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ * Author: Zhuoyu Zhang <zhuoyu.zh...@freescale.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <hwconfig.h>
+#include <fsl_devdis.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch-ls102xa/immap_ls102xa.h>
+#include <asm/arch-ls102xa/config.h>
+#include <linux/compiler.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 < ARRAY_SIZE(tbl); i++) {
+ if (hwconfig_sub("devdis", tbl[i].name))
+ setbits_be32(&gur->devdisr + tbl[i].offset,
+ tbl[i].mask);
+ }
+}
+
diff --git a/include/configs/ls1021aqds.h b/include/configs/ls1021aqds.h
index 0871a71..f8710ed 100644
--- a/include/configs/ls1021aqds.h
+++ b/include/configs/ls1021aqds.h
@@ -567,7 +567,9 @@ unsigned long get_board_ddr_clk(void);
#define CONFIG_TIMER_CLK_FREQ 12500000
#define CONFIG_HWCONFIG
-#define HWCONFIG_BUFFER_SIZE 128
+#define HWCONFIG_BUFFER_SIZE 256
+
+#define CONFIG_FSL_DEVICE_DISABLE
#define CONFIG_BOOTDELAY 3
diff --git a/include/configs/ls1021atwr.h b/include/configs/ls1021atwr.h
index df7af3c..56e5808 100644
--- a/include/configs/ls1021atwr.h
+++ b/include/configs/ls1021atwr.h
@@ -415,7 +415,9 @@
#define CONFIG_TIMER_CLK_FREQ 12500000
#define CONFIG_HWCONFIG
-#define HWCONFIG_BUFFER_SIZE 128
+#define HWCONFIG_BUFFER_SIZE 256
+
+#define CONFIG_FSL_DEVICE_DISABLE
#define CONFIG_BOOTDELAY 3
diff --git a/include/fsl_devdis.h b/include/fsl_devdis.h
new file mode 100644
index 0000000..02415fe
--- /dev/null
+++ b/include/fsl_devdis.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __FSL_DEVDIS_H_
+#define __FSL_DEVDIS_H_
+
+struct devdis_table {
+ char name[32];
+ u32 offset;
+ u32 mask;
+};
+
+void device_disable(const struct devdis_table *tbl, uint32_t num);
+
+#endif
--
2.1.0.27.g96db324
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