[U-Boot] [PATCH] powerpc/b4860: Disable unused devices using DEVDISR register

Sandeep Singh
2013-07-02T11:05:07Z

Explicitly disabling unused IPs/blocks. This will lower
power consumption.

Signed-off-by: Sandeep Singh <Sandeep@freescale.com>
---
arch/powerpc/cpu/mpc85xx/Makefile | 1 +
arch/powerpc/cpu/mpc85xx/b4860_cpu.c | 130 ++++++++++++++++++++++++++++++++++
arch/powerpc/include/asm/processor.h | 1 +
board/freescale/b4860qds/b4860qds.c | 2 +
4 files changed, 134 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/cpu/mpc85xx/b4860_cpu.c

diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index cefd57b..340f3dd 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -149,6 +149,7 @@ COBJS-$(CONFIG_PPC_T4240) += t4240_serdes.o
COBJS-$(CONFIG_PPC_T4160) += t4240_serdes.o
COBJS-$(CONFIG_PPC_B4420) += b4860_serdes.o
COBJS-$(CONFIG_PPC_B4860) += b4860_serdes.o
+COBJS-$(CONFIG_PPC_B4860) += b4860_cpu.o
COBJS-$(CONFIG_BSC9132) += bsc9132_serdes.o
COBJS-$(CONFIG_PPC_T1040) += t1040_serdes.o

diff --git a/arch/powerpc/cpu/mpc85xx/b4860_cpu.c b/arch/powerpc/cpu/mpc85xx/b4860_cpu.c
new file mode 100644
index 0000000..600842a
--- /dev/null
+++ b/arch/powerpc/cpu/mpc85xx/b4860_cpu.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+#define DISABLE_DDR1 0x8000
+#define DISABLE_DDR2 0x4000
+#define DISABLE_MAPLE_LTE0 0x0080
+#define DISABLE_MAPLE_LTE1 0x0040
+#define DISABLE_MAPLE_WCDMA 0x0020
+
+/* Set DCFG_DEVDISRn for devices to be disabled for B4860 */
+#define B4860_DCFG_DEVDISR1 0
+#define B4860_DCFG_DEVDISR2 0
+#define B4860_DCFG_DEVDISR3 0
+#define B4860_DCFG_DEVDISR4 0
+#define B4860_DCFG_DEVDISR5 0
+
+/* Set DCFG_DEVDISRn for devices to be disabled for G4860 */
+#define G4860_DCFG_DEVDISR1 0
+#define G4860_DCFG_DEVDISR2 0
+#define G4860_DCFG_DEVDISR3 (DISABLE_MAPLE_LTE0 | DISABLE_MAPLE_LTE1 |\
+ DISABLE_MAPLE_WCDMA)
+#define G4860_DCFG_DEVDISR4 0
+#define G4860_DCFG_DEVDISR5 0
+
+/* Set DCFG_DEVDISRn for devices to be disabled for B4060 */
+#define B4060_DCFG_DEVDISR1 0
+#define B4060_DCFG_DEVDISR2 0
+#define B4060_DCFG_DEVDISR3 0
+#define B4060_DCFG_DEVDISR4 0
+#define B4060_DCFG_DEVDISR5 DISABLE_DDR2
+
+/* Set DCFG_DEVDISRn for devices to be disabled for G4060 */
+#define G4060_DCFG_DEVDISR1 0
+#define G4060_DCFG_DEVDISR2 0
+#define G4060_DCFG_DEVDISR3 (DISABLE_MAPLE_LTE0 | DISABLE_MAPLE_LTE1 |\
+ DISABLE_MAPLE_WCDMA)
+#define G4060_DCFG_DEVDISR4 0
+#define G4060_DCFG_DEVDISR5 DISABLE_DDR2
+
+/* Set DCFG_DEVDISRn for devices to be disabled for B4420 */
+#define B4420_DCFG_DEVDISR1 0
+#define B4420_DCFG_DEVDISR2 0
+#define B4420_DCFG_DEVDISR3 DISABLE_MAPLE_LTE1
+#define B4420_DCFG_DEVDISR4 0
+#define B4420_DCFG_DEVDISR5 DISABLE_DDR2
+
+
+void cpu_device_disable()
+{
+ ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
+
+ /* get devdisr */
+ u32 *devdisr1 = in_be32(&gur->devdisr);
+ u32 *devdisr2 = in_be32(&gur->devdisr2);
+ u32 *devdisr3 = in_be32(&gur->devdisr3);
+ u32 *devdisr4 = in_be32(&gur->devdisr4);
+ u32 *devdisr5 = in_be32(&gur->devdisr5);
+
+ /* get SVR info */
+ u32 svr = SVR_SOC_VER(get_svr());
+
+ /*
+ * Decide on the basis of SVR which devices to disable for a
+ * particular personality
+ */
+ switch (svr) {
+ case SVR_B4860:
+ setbits_be32(devdisr1, B4860_DCFG_DEVDISR1);
+ setbits_be32(devdisr2, B4860_DCFG_DEVDISR2);
+ setbits_be32(devdisr3, B4860_DCFG_DEVDISR3);
+ setbits_be32(devdisr4, B4860_DCFG_DEVDISR4);
+ setbits_be32(devdisr5, B4860_DCFG_DEVDISR5);
+ break;
+ case SVR_G4860:
+ setbits_be32(devdisr1, G4860_DCFG_DEVDISR1);
+ setbits_be32(devdisr2, G4860_DCFG_DEVDISR2);
+ setbits_be32(devdisr3, G4860_DCFG_DEVDISR3);
+ setbits_be32(devdisr4, G4860_DCFG_DEVDISR4);
+ setbits_be32(devdisr5, G4860_DCFG_DEVDISR5);
+ break;
+ case SVR_B4060:
+ setbits_be32(devdisr1, B4060_DCFG_DEVDISR1);
+ setbits_be32(devdisr2, B4060_DCFG_DEVDISR2);
+ setbits_be32(devdisr3, B4060_DCFG_DEVDISR3);
+ setbits_be32(devdisr4, B4060_DCFG_DEVDISR4);
+ setbits_be32(devdisr5, B4060_DCFG_DEVDISR5);
+ break;
+ case SVR_G4060:
+ setbits_be32(devdisr1, G4060_DCFG_DEVDISR1);
+ setbits_be32(devdisr2, G4060_DCFG_DEVDISR2);
+ setbits_be32(devdisr3, G4060_DCFG_DEVDISR3);
+ setbits_be32(devdisr4, G4060_DCFG_DEVDISR4);
+ setbits_be32(devdisr5, G4060_DCFG_DEVDISR5);
+ break;
+ case SVR_B4420:
+ setbits_be32(devdisr1, B4420_DCFG_DEVDISR1);
+ setbits_be32(devdisr2, B4420_DCFG_DEVDISR2);
+ setbits_be32(devdisr3, B4420_DCFG_DEVDISR3);
+ setbits_be32(devdisr4, B4420_DCFG_DEVDISR4);
+ setbits_be32(devdisr5, B4420_DCFG_DEVDISR5);
+ break;
+ default:
+ printf("Unused devices not disabled:"
+ "No matching SVR\n");
+ break;
+ }
+}
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 64a6f9c..143d561 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -1125,6 +1125,7 @@
#define SVR_B4860 0X868000
#define SVR_G4860 0x868001
#define SVR_G4060 0x868003
+#define SVR_B4060 0x868002
#define SVR_B4440 0x868100
#define SVR_G4440 0x868101
#define SVR_B4420 0x868102
diff --git a/board/freescale/b4860qds/b4860qds.c b/board/freescale/b4860qds/b4860qds.c
index b1b012c..5e2efd3 100644
--- a/board/freescale/b4860qds/b4860qds.c
+++ b/board/freescale/b4860qds/b4860qds.c
@@ -575,6 +575,8 @@ int board_early_init_r(void)
int ret;
u32 svr = SVR_SOC_VER(get_svr());

+ cpu_device_disable();
+
/* Create law for MAPLE only for personalities having MAPLE */
if ((svr == SVR_B4860) || (svr == SVR_B4440) ||
(svr == SVR_B4420) || (svr == SVR_B4220)) {
--
1.7.6.GIT