x86: sandbox: Add a PMC emulator and test

Add a simple PMC for sandbox to permit tests to run.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

3 files changed, 90 insertions, 0 deletions

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 1e4cf146c5..4e29e7b3c5 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -228,6 +228,14 @@ config CMD_LICENSE
 	help
 	  Print GPL license text
 
+config CMD_PMC
+	bool "pmc"
+	help
+	  Provides access to the Intel Power-Management Controller (PMC) so
+	  that its state can be examined. This does not currently support
+	  changing the state but it is still useful for debugging and seeing
+	  what is going on.
+
 config CMD_REGINFO
 	bool "reginfo"
 	depends on PPC
diff --git a/cmd/Makefile b/cmd/Makefile
index 3ac7104546..12e898d962 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -109,6 +109,7 @@ ifdef CONFIG_PCI
 obj-$(CONFIG_CMD_PCI) += pci.o
 endif
 obj-$(CONFIG_CMD_PINMUX) += pinmux.o
+obj-$(CONFIG_CMD_PMC) += pmc.o
 obj-$(CONFIG_CMD_PXE) += pxe.o pxe_utils.o
 obj-$(CONFIG_CMD_WOL) += wol.o
 obj-$(CONFIG_CMD_QFW) += qfw.o
diff --git a/cmd/pmc.c b/cmd/pmc.c
new file mode 100644
index 0000000000..cafeba9fcc
--- /dev/null
+++ b/cmd/pmc.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel PMC command
+ *
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <power/acpi_pmc.h>
+
+static int get_pmc_dev(struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_first_device_err(UCLASS_ACPI_PMC, &dev);
+	if (ret) {
+		printf("Could not find device (err=%d)\n", ret);
+		return ret;
+	}
+	ret = pmc_init(dev);
+	if (ret) {
+		printf("Could not init device (err=%d)\n", ret);
+		return ret;
+	}
+	*devp = dev;
+
+	return 0;
+}
+
+static int do_pmc_init(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = get_pmc_dev(&dev);
+	if (ret)
+		return CMD_RET_FAILURE;
+
+	return 0;
+}
+
+static int do_pmc_info(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = get_pmc_dev(&dev);
+	if (ret)
+		return CMD_RET_FAILURE;
+	pmc_dump_info(dev);
+
+	return 0;
+}
+
+static cmd_tbl_t cmd_pmc_sub[] = {
+	U_BOOT_CMD_MKENT(init, 0, 1, do_pmc_init, "", ""),
+	U_BOOT_CMD_MKENT(info, 0, 1, do_pmc_info, "", ""),
+};
+
+static int do_pmc(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	const cmd_tbl_t *cp;
+
+	if (argc < 2) /* no subcommand */
+		return cmd_usage(cmdtp);
+
+	cp = find_cmd_tbl(argv[1], &cmd_pmc_sub[0], ARRAY_SIZE(cmd_pmc_sub));
+	if (!cp)
+		return CMD_RET_USAGE;
+
+	return cp->cmd(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	pmc, 2, 1, do_pmc, "Power-management controller info",
+	"info - read state and show info about the PMC\n"
+	"pmc init - read state from the PMC\n"
+	);