[PATCHv4 10/14] cmd: cpu: add release subcommand
Zhiqiang Hou
Zhiqiang.Hou at nxp.com
Tue Jul 30 09:29:59 CEST 2024
From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
Add a new subcommand 'release' to bring up a core to run baremetal
and RTOS applications.
For example on i.MX8M Plus EVK, release the LAST core to run a RTOS
application, passing the sequence number of the CPU core to release,
here it is 3:
u-boot=> cpu list
0: cpu at 0 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 31C
1: cpu at 1 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 30C
2: cpu at 2 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 31C
3: cpu at 3 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 31C
u-boot=> load mmc 1:2 c0000000 /hello_world.bin
66008 bytes read in 5 ms (12.6 MiB/s)
u-boot=> dcache flush; icache flush
u-boot=> cpu release 3 c0000000
Released CPU core (mpidr: 0x3) to address 0xc0000000
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
V4:
- Updated the change logs.
cmd/cpu.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 42 insertions(+), 2 deletions(-)
diff --git a/cmd/cpu.c b/cmd/cpu.c
index 9e323069b9..2755250756 100644
--- a/cmd/cpu.c
+++ b/cmd/cpu.c
@@ -3,6 +3,7 @@
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg at chromium.org>
* Copyright (c) 2017 Álvaro Fernández Rojas <noltari at gmail.com>
+ * Copyright 2024 NXP
*/
#include <command.h>
@@ -18,6 +19,19 @@ static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
"Device ID",
};
+static struct udevice *cpu_find_device(unsigned long cpu_id)
+{
+ struct udevice *dev;
+
+ for (uclass_first_device(UCLASS_CPU, &dev); dev;
+ uclass_next_device(&dev)) {
+ if (cpu_id == dev_seq(dev))
+ return dev;
+ }
+
+ return NULL;
+}
+
static int print_cpu_list(bool detail)
{
struct udevice *dev;
@@ -82,10 +96,36 @@ static int do_cpu_detail(struct cmd_tbl *cmdtp, int flag, int argc,
return 0;
}
+static int do_cpu_release(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ struct udevice *dev;
+ unsigned long cpu_id;
+ unsigned long long boot_addr;
+
+ if (argc != 3)
+ return CMD_RET_USAGE;
+
+ cpu_id = dectoul(argv[1], NULL);
+ dev = cpu_find_device(cpu_id);
+ if (!dev)
+ return CMD_RET_FAILURE;
+
+ boot_addr = simple_strtoull(argv[2], NULL, 16);
+
+ if (cpu_release_core(dev, boot_addr))
+ return CMD_RET_FAILURE;
+
+ return 0;
+}
+
U_BOOT_LONGHELP(cpu,
"list - list available CPUs\n"
- "cpu detail - show CPU detail");
+ "cpu detail - show CPU detail\n"
+ "cpu release <core ID> <addr> - Release CPU <core ID> at <addr>\n"
+ " <core ID>: the sequence number in list subcommand outputs");
U_BOOT_CMD_WITH_SUBCMDS(cpu, "display information about CPUs", cpu_help_text,
U_BOOT_SUBCMD_MKENT(list, 1, 1, do_cpu_list),
- U_BOOT_SUBCMD_MKENT(detail, 1, 0, do_cpu_detail));
+ U_BOOT_SUBCMD_MKENT(detail, 1, 0, do_cpu_detail),
+ U_BOOT_SUBCMD_MKENT(release, 3, 0, do_cpu_release));
--
2.17.1
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