Add support to disable cpu's in multicore processors

Add a disable sub-command to the cpu command that allows for disabling
cores in multicore processors.  This can be useful for systems that are
using multicore chips but aren't utilizing all the cores as a way to
reduce power and possibly improve performance.

Also updated an added missing copyright.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/common/cmd_mp.c b/common/cmd_mp.c
index 71e430362fd456b25e3bedcdd52985bf5d1b9686..d78c20951ee34060a04af1acc1c7dbd7a83dc9f1 100644 (file)
--- a/common/cmd_mp.c
+++ b/common/cmd_mp.c
@@ -46,6 +46,8 @@ cpu_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
                        cpu_reset(cpuid);
                } else if (strncmp(argv[2], "status", 6) == 0) {
                        cpu_status(cpuid);
+               } else if (strncmp(argv[2], "disable", 7) == 0) {
+                       return cpu_disable(cpuid);
                } else {
                        cmd_usage(cmdtp);
                        return 1;
@@ -86,6 +88,7 @@ U_BOOT_CMD(
        "Multiprocessor CPU boot manipulation and release",
            "<num> reset                 - Reset cpu <num>\n"
        "cpu <num> status                - Status of cpu <num>\n"
+       "cpu <num> disable               - Disable cpu <num>\n"
        "cpu <num> release <addr> [args] - Release cpu <num> at <addr> with [args]"
 #ifdef CPU_ARCH_HELP
        "\n"

diff --git a/cpu/mpc85xx/mp.c b/cpu/mpc85xx/mp.c
index 6530cb176b4564858ee83823ddc6812a8aaaf821..6ae7f0a72ca4903f0802a8d62b657679d226c2f4 100644 (file)
--- a/cpu/mpc85xx/mp.c
+++ b/cpu/mpc85xx/mp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2009 Freescale Semiconductor, Inc.
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -68,6 +68,12 @@ int cpu_status(int nr)
        return 0;
 }
 
+int cpu_disable(int nr)
+{
+       /* dummy function so common/cmd_mp.c will build */
+       return 1;
+}
+
 static u8 boot_entry_map[4] = {
        0,
        BOOT_ENTRY_PIR,

diff --git a/cpu/mpc86xx/mp.c b/cpu/mpc86xx/mp.c
index 2940673c7c7bfc89ba6de040685781abe334c351..ecdf2fb389b9eea35cf1f98e8967082bbba61c3d 100644 (file)
--- a/cpu/mpc86xx/mp.c
+++ b/cpu/mpc86xx/mp.c
@@ -1,3 +1,25 @@
+/*
+ * Copyright 2008-2010 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/mmu.h>
@@ -24,6 +46,12 @@ int cpu_status(int nr)
        return 0;
 }
 
+int cpu_disable(int nr)
+{
+       /* dummy function so common/cmd_mp.c will build */
+       return 1;
+}
+
 int cpu_release(int nr, int argc, char *argv[])
 {
        /* dummy function so common/cmd_mp.c will build

diff --git a/include/common.h b/include/common.h
index 391790a411b01c07b6bb546328ad0e24da27e597..81f2b59dea1559a7d2a030b475786b06187d4680 100644 (file)
--- a/include/common.h
+++ b/include/common.h
@@ -712,6 +712,7 @@ void show_boot_progress(int val);
 #ifdef CONFIG_MP
 int cpu_status(int nr);
 int cpu_reset(int nr);
+int cpu_disable(int nr);
 int cpu_release(int nr, int argc, char *argv[]);
 #endif