plat/synquacer: enable SCMI support

drivers/arm/css/scmi/scmi_private.h

@@ -152,4 +152,9 @@ static inline void validate_scmi_channel(scmi_channel_t *ch)
 	assert(ch->info && ch->info->scmi_mbx_mem);
 }
 
+/*
+ * SCMI vendor specific protocol
+ */
+#define SCMI_SYS_VENDOR_EXT_PROTO_ID		0x80
+
 #endif /* SCMI_PRIVATE_H */

drivers/arm/css/scmi/vendor/scmi_sq.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/arm/css/scmi.h>
+
+#include "scmi_private.h"
+#include "scmi_sq.h"
+
+#include <sq_common.h>
+
+/* SCMI messge ID to get the available DRAM region */
+#define SCMI_VENDOR_EXT_MEMINFO_GET_MSG		0x3
+
+/*
+ * API to get the available DRAM region
+ */
+int scmi_get_draminfo(void *p, struct draminfo *info)
+{
+	mailbox_mem_t *mbx_mem;
+	int token = 0, ret;
+	scmi_channel_t *ch = (scmi_channel_t *)p;
+	struct dram_info_resp response;
+
+	validate_scmi_channel(ch);
+
+	scmi_get_channel(ch);
+
+	mbx_mem = (mailbox_mem_t *)(ch->info->scmi_mbx_mem);
+	mbx_mem->msg_header = SCMI_MSG_CREATE(SCMI_SYS_VENDOR_EXT_PROTO_ID,
+			SCMI_VENDOR_EXT_MEMINFO_GET_MSG, token);
+	mbx_mem->len = 8;
+	mbx_mem->flags = SCMI_FLAG_RESP_POLL;
+
+	scmi_send_sync_command(ch);
+
+	/*
+	 * Ensure that any read to the SCPI payload area is done after reading
+	 * the MHU register. If these 2 reads were reordered then the CPU would
+	 * read invalid payload data
+	 */
+	dmbld();
+
+	/* Get the return values */
+	SCMI_PAYLOAD_RET_VAL1(mbx_mem->payload, ret);
+
+	memcpy(&response, (void *)mbx_mem->payload, sizeof(response));
+
+	scmi_put_channel(ch);
+
+	*info = response.info;
+
+	return ret;
+}

drivers/arm/css/scmi/vendor/scmi_sq.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SCMI_SQ_H
+#define SCMI_SQ_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <sq_common.h>
+
+/* Structure to represent available DRAM region */
+struct dram_info_resp {
+	int status;
+	int reserved;
+	struct draminfo info;
+};
+
+/* API to get the available DRAM region */
+int scmi_get_draminfo(void *p, struct draminfo *info);
+
+#endif /* SCMI_SQ_H */

include/drivers/arm/css/css_mhu_doorbell.h

@@ -12,7 +12,7 @@
 #include <lib/mmio.h>
 
 /* MHUv2 Base Address */
-#define MHUV2_BASE_ADDR		PLAT_CSS_MHU_BASE
+#define MHUV2_BASE_ADDR		PLAT_MHUV2_BASE
 
 /* MHUv2 Control Registers Offsets */
 #define MHU_V2_MSG_NO_CAP_OFFSET		0xF80

plat/arm/board/juno/include/platform_def.h

@@ -222,6 +222,7 @@
 
 /* MHU related constants */
 #define PLAT_CSS_MHU_BASE		UL(0x2b1f0000)
+#define PLAT_MHUV2_BASE			PLAT_CSS_MHU_BASE
 
 /*
  * Base address of the first memory region used for communication between AP

plat/arm/board/n1sdp/include/platform_def.h

@@ -61,6 +61,7 @@
 
 #define PLAT_ARM_NSTIMER_FRAME_ID		0
 #define PLAT_CSS_MHU_BASE			0x45000000
+#define PLAT_MHUV2_BASE				PLAT_CSS_MHU_BASE
 #define PLAT_MAX_PWR_LVL			1
 
 #define PLAT_ARM_G1S_IRQS			ARM_G1S_IRQS,			\

plat/arm/board/rde1edge/include/platform_def.h

@@ -16,6 +16,7 @@
 #define CSS_SGI_MAX_PE_PER_CPU		2
 
 #define PLAT_CSS_MHU_BASE		UL(0x45400000)
+#define PLAT_MHUV2_BASE			PLAT_CSS_MHU_BASE
 
 /* Base address of DMC-620 instances */
 #define RDE1EDGE_DMC620_BASE0		UL(0x4e000000)

plat/arm/board/rdn1edge/include/platform_def.h

@@ -16,6 +16,7 @@
 #define CSS_SGI_MAX_PE_PER_CPU		1
 
 #define PLAT_CSS_MHU_BASE		UL(0x45400000)
+#define PLAT_MHUV2_BASE			PLAT_CSS_MHU_BASE
 
 /* Base address of DMC-620 instances */
 #define RDN1EDGE_DMC620_BASE0		UL(0x4e000000)

plat/arm/board/sgi575/include/platform_def.h

@@ -16,6 +16,7 @@
 #define CSS_SGI_MAX_PE_PER_CPU		1
 
 #define PLAT_CSS_MHU_BASE		UL(0x45000000)
+#define PLAT_MHUV2_BASE			PLAT_CSS_MHU_BASE
 
 /* Base address of DMC-620 instances */
 #define SGI575_DMC620_BASE0		UL(0x4e000000)

plat/arm/css/sgm/include/sgm_base_platform_def.h

@@ -86,6 +86,7 @@
 
 /* MHU related constants */
 #define PLAT_CSS_MHU_BASE		0x2b1f0000
+#define PLAT_MHUV2_BASE			PLAT_CSS_MHU_BASE
 
 #define PLAT_ARM_TRUSTED_ROM_BASE	0x00000000
 #define PLAT_ARM_TRUSTED_ROM_SIZE	0x00080000

plat/socionext/synquacer/drivers/scp/sq_scmi.c

@@ -0,0 +1,239 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/arm/css/css_mhu_doorbell.h>
+#include <drivers/arm/css/css_scp.h>
+#include <drivers/arm/css/scmi.h>
+#include <plat/arm/css/common/css_pm.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+#include <scmi_sq.h>
+#include <sq_common.h>
+
+/*
+ * This file implements the SCP helper functions using SCMI protocol.
+ */
+
+DEFINE_BAKERY_LOCK(sq_scmi_lock);
+#define SQ_SCMI_LOCK_GET_INSTANCE	(&sq_scmi_lock)
+
+#define SQ_SCMI_PAYLOAD_BASE		PLAT_SQ_SCP_COM_SHARED_MEM_BASE
+#define MHU_CPU_INTR_S_SET_OFFSET	0x308
+
+const uint32_t sq_core_pos_to_scmi_dmn_id_map[PLATFORM_CORE_COUNT] = {
+	0,   1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
+	12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
+};
+
+static scmi_channel_plat_info_t sq_scmi_plat_info = {
+		.scmi_mbx_mem = SQ_SCMI_PAYLOAD_BASE,
+		.db_reg_addr = PLAT_SQ_MHU_BASE + MHU_CPU_INTR_S_SET_OFFSET,
+		.db_preserve_mask = 0xfffffffe,
+		.db_modify_mask = 0x1,
+		.ring_doorbell = &mhu_ring_doorbell,
+};
+
+/*
+ * SCMI power state parameter bit field encoding for SynQuacer platform.
+ *
+ * 31  20 19       16 15      12 11       8 7        4 3         0
+ * +-------------------------------------------------------------+
+ * | SBZ | Max level |  Level 3 |  Level 2 |  Level 1 |  Level 0 |
+ * |     |           |   state  |   state  |   state  |   state  |
+ * +-------------------------------------------------------------+
+ *
+ * `Max level` encodes the highest level that has a valid power state
+ * encoded in the power state.
+ */
+#define SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT	16
+#define SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH	4
+#define SCMI_PWR_STATE_MAX_PWR_LVL_MASK		\
+				((1 << SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH) - 1)
+#define SCMI_SET_PWR_STATE_MAX_PWR_LVL(_power_state, _max_level)		\
+		(_power_state) |= ((_max_level) & SCMI_PWR_STATE_MAX_PWR_LVL_MASK)\
+				<< SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT
+#define SCMI_GET_PWR_STATE_MAX_PWR_LVL(_power_state)		\
+		(((_power_state) >> SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT)	\
+				& SCMI_PWR_STATE_MAX_PWR_LVL_MASK)
+
+#define SCMI_PWR_STATE_LVL_WIDTH		4
+#define SCMI_PWR_STATE_LVL_MASK			\
+				((1 << SCMI_PWR_STATE_LVL_WIDTH) - 1)
+#define SCMI_SET_PWR_STATE_LVL(_power_state, _level, _level_state)		\
+		(_power_state) |= ((_level_state) & SCMI_PWR_STATE_LVL_MASK)	\
+				<< (SCMI_PWR_STATE_LVL_WIDTH * (_level))
+#define SCMI_GET_PWR_STATE_LVL(_power_state, _level)		\
+		(((_power_state) >> (SCMI_PWR_STATE_LVL_WIDTH * (_level))) &	\
+				SCMI_PWR_STATE_LVL_MASK)
+
+/*
+ * The SCMI power state enumeration for a power domain level
+ */
+typedef enum {
+	scmi_power_state_off = 0,
+	scmi_power_state_on = 1,
+	scmi_power_state_sleep = 2,
+} scmi_power_state_t;
+
+/*
+ * The global handle for invoking the SCMI driver APIs after the driver
+ * has been initialized.
+ */
+static void *sq_scmi_handle;
+
+/* The SCMI channel global object */
+static scmi_channel_t channel;
+
+/*
+ * Helper function to turn off a CPU power domain and
+ * its parent power domains if applicable.
+ */
+void sq_scmi_off(const struct psci_power_state *target_state)
+{
+	int lvl = 0, ret;
+	uint32_t scmi_pwr_state = 0;
+
+	/* At-least the CPU level should be specified to be OFF */
+	assert(target_state->pwr_domain_state[SQ_PWR_LVL0] ==
+							SQ_LOCAL_STATE_OFF);
+
+	for (; lvl <= PLAT_MAX_PWR_LVL; lvl++) {
+		if (target_state->pwr_domain_state[lvl] == SQ_LOCAL_STATE_RUN)
+			break;
+
+		assert(target_state->pwr_domain_state[lvl] ==
+							SQ_LOCAL_STATE_OFF);
+		SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl,
+				scmi_power_state_off);
+	}
+
+	SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1);
+
+	ret = scmi_pwr_state_set(sq_scmi_handle,
+		sq_core_pos_to_scmi_dmn_id_map[plat_my_core_pos()],
+		scmi_pwr_state);
+
+	if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) {
+		ERROR("SCMI set power state command return 0x%x unexpected\n",
+				ret);
+		panic();
+	}
+}
+
+/*
+ * Helper function to turn ON a CPU power domain and
+ *its parent power domains if applicable.
+ */
+void sq_scmi_on(u_register_t mpidr)
+{
+	int lvl = 0, ret, core_pos;
+	uint32_t scmi_pwr_state = 0;
+
+	for (; lvl <= PLAT_MAX_PWR_LVL; lvl++)
+		SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl,
+				scmi_power_state_on);
+
+	SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1);
+
+	core_pos = plat_core_pos_by_mpidr(mpidr);
+	assert(core_pos >= 0 && core_pos < PLATFORM_CORE_COUNT);
+
+	ret = scmi_pwr_state_set(sq_scmi_handle,
+		sq_core_pos_to_scmi_dmn_id_map[core_pos],
+		scmi_pwr_state);
+
+	if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) {
+		ERROR("SCMI set power state command return 0x%x unexpected\n",
+				ret);
+		panic();
+	}
+}
+
+void __dead2 sq_scmi_system_off(int state)
+{
+	int ret;
+
+	/*
+	 * Disable GIC CPU interface to prevent pending interrupt from waking
+	 * up the AP from WFI.
+	 */
+	sq_gic_cpuif_disable();
+
+	/*
+	 * Issue SCMI command. First issue a graceful
+	 * request and if that fails force the request.
+	 */
+	ret = scmi_sys_pwr_state_set(sq_scmi_handle,
+			SCMI_SYS_PWR_FORCEFUL_REQ,
+			state);
+
+	if (ret != SCMI_E_SUCCESS) {
+		ERROR("SCMI system power state set 0x%x returns unexpected 0x%x\n",
+			state, ret);
+		panic();
+	}
+	wfi();
+	ERROR("SCMI set power state: operation not handled.\n");
+	panic();
+}
+
+/*
+ * Helper function to reset the system via SCMI.
+ */
+void __dead2 sq_scmi_sys_reboot(void)
+{
+	sq_scmi_system_off(SCMI_SYS_PWR_COLD_RESET);
+}
+
+static int scmi_ap_core_init(scmi_channel_t *ch)
+{
+#if PROGRAMMABLE_RESET_ADDRESS
+	uint32_t version;
+	int ret;
+
+	ret = scmi_proto_version(ch, SCMI_AP_CORE_PROTO_ID, &version);
+	if (ret != SCMI_E_SUCCESS) {
+		WARN("SCMI AP core protocol version message failed\n");
+		return -1;
+	}
+
+	if (!is_scmi_version_compatible(SCMI_AP_CORE_PROTO_VER, version)) {
+		WARN("SCMI AP core protocol version 0x%x incompatible with driver version 0x%x\n",
+						version, SCMI_AP_CORE_PROTO_VER);
+		return -1;
+	}
+	INFO("SCMI AP core protocol version 0x%x detected\n", version);
+#endif
+	return 0;
+}
+
+void __init plat_sq_pwrc_setup(void)
+{
+	channel.info = &sq_scmi_plat_info;
+	channel.lock = SQ_SCMI_LOCK_GET_INSTANCE;
+	sq_scmi_handle = scmi_init(&channel);
+	if (sq_scmi_handle == NULL) {
+		ERROR("SCMI Initialization failed\n");
+		panic();
+	}
+	if (scmi_ap_core_init(&channel) < 0) {
+		ERROR("SCMI AP core protocol initialization failed\n");
+		panic();
+	}
+}
+
+uint32_t sq_scmi_get_draminfo(struct draminfo *info)
+{
+	scmi_get_draminfo(sq_scmi_handle, info);
+
+	return 0;
+}