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https://github.com/brain-hackers/u-boot-brain
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4194b3668a
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>
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*
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* Copyright 2008-2009 Freescale Semiconductor, Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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int
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cpu_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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unsigned long cpuid;
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if (argc < 3) {
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cmd_usage(cmdtp);
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return 1;
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}
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cpuid = simple_strtoul(argv[1], NULL, 10);
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if (cpuid >= cpu_numcores()) {
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printf ("Core num: %lu is out of range[0..%d]\n",
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cpuid, cpu_numcores() - 1);
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return 1;
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}
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if (argc == 3) {
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if (strncmp(argv[2], "reset", 5) == 0) {
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cpu_reset(cpuid);
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} else if (strncmp(argv[2], "status", 6) == 0) {
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cpu_status(cpuid);
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} else if (strncmp(argv[2], "disable", 7) == 0) {
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return cpu_disable(cpuid);
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} else {
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cmd_usage(cmdtp);
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return 1;
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}
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return 0;
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}
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/* 4 or greater, make sure its release */
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if (strncmp(argv[2], "release", 7) != 0) {
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cmd_usage(cmdtp);
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return 1;
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}
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if (cpu_release(cpuid, argc - 3, argv + 3)) {
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cmd_usage(cmdtp);
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return 1;
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}
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return 0;
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}
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#ifdef CONFIG_PPC
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#define CPU_ARCH_HELP \
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" [args] : <pir> <r3> <r6>\n" \
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" pir - processor id (if writeable)\n" \
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" r3 - value for gpr 3\n" \
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" r6 - value for gpr 6\n" \
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"\n" \
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" Use '-' for any arg if you want the default value.\n" \
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" Default for r3 is <num> and r6 is 0\n" \
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"\n" \
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" When cpu <num> is released r4 and r5 = 0.\n" \
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" r7 will contain the size of the initial mapped area"
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#endif
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U_BOOT_CMD(
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cpu, CONFIG_SYS_MAXARGS, 1, cpu_cmd,
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"Multiprocessor CPU boot manipulation and release",
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"<num> reset - Reset cpu <num>\n"
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"cpu <num> status - Status of cpu <num>\n"
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"cpu <num> disable - Disable cpu <num>\n"
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"cpu <num> release <addr> [args] - Release cpu <num> at <addr> with [args]"
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#ifdef CPU_ARCH_HELP
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"\n"
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CPU_ARCH_HELP
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#endif
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);
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