[PATCH 11/16] lib: utils: Add simple FDT based CPPC driver framework
Anup Patel
apatel at ventanamicro.com
Tue Aug 6 00:33:33 PDT 2024
The generic platform can have multiple CPPC drivers so add a simple
FDT based CPPC driver framework.
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
include/sbi_utils/cppc/fdt_cppc.h | 35 +++++++++++
lib/utils/Kconfig | 2 +
lib/utils/cppc/Kconfig | 10 ++++
lib/utils/cppc/fdt_cppc.c | 82 ++++++++++++++++++++++++++
lib/utils/cppc/fdt_cppc_drivers.carray | 3 +
lib/utils/cppc/objects.mk | 11 ++++
platform/generic/configs/defconfig | 1 +
platform/generic/platform.c | 3 +
8 files changed, 147 insertions(+)
create mode 100644 include/sbi_utils/cppc/fdt_cppc.h
create mode 100644 lib/utils/cppc/Kconfig
create mode 100644 lib/utils/cppc/fdt_cppc.c
create mode 100644 lib/utils/cppc/fdt_cppc_drivers.carray
create mode 100644 lib/utils/cppc/objects.mk
diff --git a/include/sbi_utils/cppc/fdt_cppc.h b/include/sbi_utils/cppc/fdt_cppc.h
new file mode 100644
index 00000000..af0cdc41
--- /dev/null
+++ b/include/sbi_utils/cppc/fdt_cppc.h
@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 Ventana Micro Systems Inc.
+ *
+ * Authors:
+ * Anup Patel <apatel at ventanamicro.com>
+ */
+
+#ifndef __FDT_CPPC_H__
+#define __FDT_CPPC_H__
+
+#include <sbi/sbi_types.h>
+
+#ifdef CONFIG_FDT_CPPC
+
+struct fdt_cppc {
+ const struct fdt_match *match_table;
+ int (*cold_init)(void *fdt, int nodeoff, const struct fdt_match *match);
+ int (*warm_init)(void);
+ void (*exit)(void);
+};
+
+void fdt_cppc_exit(void);
+
+int fdt_cppc_init(bool cold_boot);
+
+#else
+
+static inline void fdt_cppc_exit(void) { }
+static inline int fdt_cppc_init(bool cold_boot) { return 0; }
+
+#endif
+
+#endif
diff --git a/lib/utils/Kconfig b/lib/utils/Kconfig
index c860a185..002d6f8f 100644
--- a/lib/utils/Kconfig
+++ b/lib/utils/Kconfig
@@ -2,6 +2,8 @@
menu "Utils and Drivers Support"
+source "$(OPENSBI_SRC_DIR)/lib/utils/cppc/Kconfig"
+
source "$(OPENSBI_SRC_DIR)/lib/utils/fdt/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/gpio/Kconfig"
diff --git a/lib/utils/cppc/Kconfig b/lib/utils/cppc/Kconfig
new file mode 100644
index 00000000..08d1c97f
--- /dev/null
+++ b/lib/utils/cppc/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: BSD-2-Clause
+
+menu "CPPC Device Support"
+
+config FDT_CPPC
+ bool "FDT based CPPC drivers"
+ depends on FDT
+ default n
+
+endmenu
diff --git a/lib/utils/cppc/fdt_cppc.c b/lib/utils/cppc/fdt_cppc.c
new file mode 100644
index 00000000..de11f0e1
--- /dev/null
+++ b/lib/utils/cppc/fdt_cppc.c
@@ -0,0 +1,82 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 Ventana Micro Systems Inc.
+ *
+ * Authors:
+ * Anup Patel <apatel at ventanamicro.com>
+ */
+
+#include <sbi/sbi_error.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/cppc/fdt_cppc.h>
+
+/* List of FDT CPPC drivers generated at compile time */
+extern struct fdt_cppc *fdt_cppc_drivers[];
+extern unsigned long fdt_cppc_drivers_size;
+
+static struct fdt_cppc *current_driver = NULL;
+
+void fdt_cppc_exit(void)
+{
+ if (current_driver && current_driver->exit)
+ current_driver->exit();
+}
+
+static int fdt_cppc_warm_init(void)
+{
+ if (current_driver && current_driver->warm_init)
+ return current_driver->warm_init();
+ return 0;
+}
+
+static int fdt_cppc_cold_init(void)
+{
+ int pos, noff, rc;
+ struct fdt_cppc *drv;
+ const struct fdt_match *match;
+ void *fdt = fdt_get_address();
+
+ for (pos = 0; pos < fdt_cppc_drivers_size; pos++) {
+ drv = fdt_cppc_drivers[pos];
+
+ noff = -1;
+ while ((noff = fdt_find_match(fdt, noff,
+ drv->match_table, &match)) >= 0) {
+ /* drv->cold_init must not be NULL */
+ if (drv->cold_init == NULL)
+ return SBI_EFAIL;
+
+ rc = drv->cold_init(fdt, noff, match);
+ if (rc == SBI_ENODEV)
+ continue;
+ if (rc)
+ return rc;
+ current_driver = drv;
+
+ /*
+ * We can have multiple CPPC devices on multi-die or
+ * multi-socket systems so we cannot break here.
+ */
+ }
+ }
+
+ /*
+ * On some single-hart system there is no need for CPPC,
+ * so we cannot return a failure here
+ */
+ return 0;
+}
+
+int fdt_cppc_init(bool cold_boot)
+{
+ int rc;
+
+ if (cold_boot) {
+ rc = fdt_cppc_cold_init();
+ if (rc)
+ return rc;
+ }
+
+ return fdt_cppc_warm_init();
+}
diff --git a/lib/utils/cppc/fdt_cppc_drivers.carray b/lib/utils/cppc/fdt_cppc_drivers.carray
new file mode 100644
index 00000000..c2a9af2c
--- /dev/null
+++ b/lib/utils/cppc/fdt_cppc_drivers.carray
@@ -0,0 +1,3 @@
+HEADER: sbi_utils/cppc/fdt_cppc.h
+TYPE: struct fdt_cppc
+NAME: fdt_cppc_drivers
diff --git a/lib/utils/cppc/objects.mk b/lib/utils/cppc/objects.mk
new file mode 100644
index 00000000..fb37478a
--- /dev/null
+++ b/lib/utils/cppc/objects.mk
@@ -0,0 +1,11 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2024 Ventana Micro Systems Inc.
+#
+# Authors:
+# Anup Patel <apatel at ventanamicro.com>
+#
+
+libsbiutils-objs-$(CONFIG_FDT_CPPC) += cppc/fdt_cppc.o
+libsbiutils-objs-$(CONFIG_FDT_CPPC) += cppc/fdt_cppc_drivers.carray.o
diff --git a/platform/generic/configs/defconfig b/platform/generic/configs/defconfig
index 78fc96b6..bd18c3c1 100644
--- a/platform/generic/configs/defconfig
+++ b/platform/generic/configs/defconfig
@@ -6,6 +6,7 @@ CONFIG_PLATFORM_SIFIVE_FU740=y
CONFIG_PLATFORM_SOPHGO_SG2042=y
CONFIG_PLATFORM_STARFIVE_JH7110=y
CONFIG_PLATFORM_THEAD=y
+CONFIG_FDT_CPPC=y
CONFIG_FDT_GPIO=y
CONFIG_FDT_GPIO_DESIGNWARE=y
CONFIG_FDT_GPIO_SIFIVE=y
diff --git a/platform/generic/platform.c b/platform/generic/platform.c
index bcd7133b..d085647d 100644
--- a/platform/generic/platform.c
+++ b/platform/generic/platform.c
@@ -17,6 +17,7 @@
#include <sbi/sbi_string.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_tlb.h>
+#include <sbi_utils/cppc/fdt_cppc.h>
#include <sbi_utils/fdt/fdt_domain.h>
#include <sbi_utils/fdt/fdt_fixup.h>
#include <sbi_utils/fdt/fdt_helper.h>
@@ -238,6 +239,7 @@ static int generic_early_init(bool cold_boot)
}
fdt_hsm_init(cold_boot);
+ fdt_cppc_init(cold_boot);
if (!generic_plat || !generic_plat->early_init)
return 0;
@@ -291,6 +293,7 @@ static int generic_vendor_ext_provider(long funcid,
static void generic_early_exit(void)
{
+ fdt_cppc_exit();
fdt_hsm_exit();
if (generic_plat && generic_plat->early_exit)
--
2.34.1
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