85xx: Added support for multicore boot mechanism

Added the cpu command that provides a generic mechanism to get status,
reset, and release secondary cores in multicore processors.

Added support for using the ePAPR defined spin-table mechanism on 85xx.

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

1 files changed, 96 insertions, 0 deletions

diff --git a/common/cmd_mp.c b/common/cmd_mp.c
new file mode 100644
index 0000000..d96e6a3
--- /dev/null
+++ b/common/cmd_mp.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2008 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 <command.h>
+
+int
+cpu_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	unsigned long cpuid, val = 0;
+
+	if (argc < 3) {
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	cpuid = simple_strtoul(argv[1], NULL, 10);
+	if (cpuid >= CONFIG_NR_CPUS) {
+		printf ("Core num: %d is out of range[0..%d]\n",
+				cpuid, CONFIG_NR_CPUS - 1);
+		return 1;
+	}
+
+
+	if (argc == 3) {
+		if (strncmp(argv[2], "reset", 5) == 0) {
+			cpu_reset(cpuid);
+		} else if (strncmp(argv[2], "status", 6) == 0) {
+			cpu_status(cpuid);
+		} else {
+			printf ("Usage:\n%s\n", cmdtp->usage);
+			return 1;
+		}
+		return 0;
+	}
+
+	/* 4 or greater, make sure its release */
+	if (strncmp(argv[2], "release", 7) != 0) {
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	val = simple_strtoul(argv[3], NULL, 16);
+
+	if (cpu_release(cpuid, val, argc - 4, argv + 4)) {
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_PPC
+#define CPU_ARCH_HELP \
+	"                         [args] : <pir> <r3> <r4> <r6> <r7>\n" \
+	"                                   pir - processor id (if writeable)\n" \
+	"                                    r3 - value for gpr 3\n" \
+	"                                    r4 - value for gpr 4\n" \
+	"                                    r6 - value for gpr 6\n" \
+	"                                    r7 - value for gpr 7\n" \
+	"\n" \
+	"     Use '-' for any arg if you want the default value.\n" \
+	"     Default for r3, r4, r7 is 0, r6 is 0x65504150\n" \
+	"\n" \
+	"     When cpu <num> is released r5 = 0 per the ePAPR spec.\n"
+#endif
+
+U_BOOT_CMD(
+	cpu, CFG_MAXARGS, 1, cpu_cmd,
+	"cpu     - Multiprocessor CPU boot manipulation and release\n",
+	    "<num> reset                 - Reset cpu <num>\n"
+	"cpu <num> status                - Status of cpu <num>\n"
+	"cpu <num> release <addr> [args] - Release cpu <num> at <addr> with [args]\n"
+#ifdef CPU_ARCH_HELP
+	CPU_ARCH_HELP
+#endif
+	);