feat(plat/mediatek/mt8186): add MCDI drivers
Add MCDI related drivers to handle CPU powered on/off in CPU suspend.
TEST=build pass
BUG=b:202871018
Change-Id: I85aaaf3a0e992a39d17c58f3d9d5ff1b5770f748
diff --git a/plat/mediatek/mt8186/drivers/mcdi/mt_mcdi.c b/plat/mediatek/mt8186/drivers/mcdi/mt_mcdi.c
new file mode 100644
index 0000000..0103612
--- /dev/null
+++ b/plat/mediatek/mt8186/drivers/mcdi/mt_mcdi.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <cdefs.h>
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <lib/utils_def.h>
+#include <mt_mcdi.h>
+
+/* Read/Write */
+#define APMCU_MCUPM_MBOX_AP_READY U(0)
+#define APMCU_MCUPM_MBOX_RESERVED_1 U(1)
+#define APMCU_MCUPM_MBOX_RESERVED_2 U(2)
+#define APMCU_MCUPM_MBOX_RESERVED_3 U(3)
+#define APMCU_MCUPM_MBOX_PWR_CTRL_EN U(4)
+#define APMCU_MCUPM_MBOX_L3_CACHE_MODE U(5)
+#define APMCU_MCUPM_MBOX_BUCK_MODE U(6)
+#define APMCU_MCUPM_MBOX_ARMPLL_MODE U(7)
+/* Read only */
+#define APMCU_MCUPM_MBOX_TASK_STA U(8)
+#define APMCU_MCUPM_MBOX_RESERVED_9 U(9)
+#define APMCU_MCUPM_MBOX_RESERVED_10 U(10)
+#define APMCU_MCUPM_MBOX_RESERVED_11 U(11)
+
+/* CPC mode - Read/Write */
+#define APMCU_MCUPM_MBOX_WAKEUP_CPU U(12)
+
+/* Mbox Slot: APMCU_MCUPM_MBOX_PWR_CTRL_EN */
+#define MCUPM_MCUSYS_CTRL BIT(0)
+#define MCUPM_BUCK_CTRL BIT(1)
+#define MCUPM_ARMPLL_CTRL BIT(2)
+#define MCUPM_CM_CTRL BIT(3)
+#define MCUPM_PWR_CTRL_MASK GENMASK(3, 0)
+
+/* Mbox Slot: APMCU_MCUPM_MBOX_BUCK_MODE */
+#define MCUPM_BUCK_NORMAL_MODE U(0) /* default */
+#define MCUPM_BUCK_LP_MODE U(1)
+#define MCUPM_BUCK_OFF_MODE U(2)
+#define NF_MCUPM_BUCK_MODE U(3)
+
+/* Mbox Slot: APMCU_MCUPM_MBOX_ARMPLL_MODE */
+#define MCUPM_ARMPLL_ON U(0) /* default */
+#define MCUPM_ARMPLL_GATING U(1)
+#define MCUPM_ARMPLL_OFF U(2)
+#define NF_MCUPM_ARMPLL_MODE U(3)
+
+/* Mbox Slot: APMCU_MCUPM_MBOX_TASK_STA */
+#define MCUPM_TASK_UNINIT U(0)
+#define MCUPM_TASK_INIT U(1)
+#define MCUPM_TASK_INIT_FINISH U(2)
+#define MCUPM_TASK_WAIT U(3)
+#define MCUPM_TASK_RUN U(4)
+#define MCUPM_TASK_PAUSE U(5)
+
+#define SSPM_MBOX_3_BASE U(0x10420000)
+
+#define MCDI_NOT_INIT U(0)
+#define MCDI_INIT_1 U(1)
+#define MCDI_INIT_2 U(2)
+#define MCDI_INIT_DONE U(3)
+
+static int mcdi_init_status __section("tzfw_coherent_mem");
+
+static inline uint32_t mcdi_mbox_read(uint32_t id)
+{
+ return mmio_read_32(SSPM_MBOX_3_BASE + (id << 2));
+}
+
+static inline void mcdi_mbox_write(uint32_t id, uint32_t val)
+{
+ mmio_write_32(SSPM_MBOX_3_BASE + (id << 2), val);
+}
+
+static void mtk_mcupm_pwr_ctrl_setting(uint32_t dev)
+{
+ mcdi_mbox_write(APMCU_MCUPM_MBOX_PWR_CTRL_EN, dev);
+}
+
+static void mtk_set_mcupm_pll_mode(uint32_t mode)
+{
+ if (mode < NF_MCUPM_ARMPLL_MODE) {
+ mcdi_mbox_write(APMCU_MCUPM_MBOX_ARMPLL_MODE, mode);
+ }
+}
+
+static void mtk_set_mcupm_buck_mode(uint32_t mode)
+{
+ if (mode < NF_MCUPM_BUCK_MODE) {
+ mcdi_mbox_write(APMCU_MCUPM_MBOX_BUCK_MODE, mode);
+ }
+}
+
+static int mtk_mcupm_is_ready(void)
+{
+ unsigned int sta = mcdi_mbox_read(APMCU_MCUPM_MBOX_TASK_STA);
+
+ return ((sta == MCUPM_TASK_WAIT) || (sta == MCUPM_TASK_INIT_FINISH));
+}
+
+static int mcdi_init_1(void)
+{
+ unsigned int sta = mcdi_mbox_read(APMCU_MCUPM_MBOX_TASK_STA);
+
+ if (sta != MCUPM_TASK_INIT) {
+ return -1;
+ }
+
+ mtk_set_mcupm_pll_mode(MCUPM_ARMPLL_OFF);
+ mtk_set_mcupm_buck_mode(MCUPM_BUCK_OFF_MODE);
+
+ mtk_mcupm_pwr_ctrl_setting(
+ MCUPM_MCUSYS_CTRL |
+ MCUPM_BUCK_CTRL |
+ MCUPM_ARMPLL_CTRL);
+
+ mcdi_mbox_write(APMCU_MCUPM_MBOX_AP_READY, 1);
+
+ return 0;
+}
+
+static int mcdi_init_2(void)
+{
+ return mtk_mcupm_is_ready() ? 0 : -1;
+}
+
+int mcdi_try_init(void)
+{
+ if (mcdi_init_status == MCDI_INIT_DONE) {
+ return 0;
+ }
+
+ if (mcdi_init_status == MCDI_NOT_INIT) {
+ mcdi_init_status = MCDI_INIT_1;
+ }
+
+ if (mcdi_init_status == MCDI_INIT_1 && mcdi_init_1() == 0) {
+ mcdi_init_status = MCDI_INIT_2;
+ }
+
+ if (mcdi_init_status == MCDI_INIT_2 && mcdi_init_2() == 0) {
+ mcdi_init_status = MCDI_INIT_DONE;
+ }
+
+ INFO("mcdi ready for mcusys-off-idle and system suspend\n");
+
+ return (mcdi_init_status == MCDI_INIT_DONE) ? 0 : mcdi_init_status;
+}