Juno: Implement initial platform port
This patch adds the initial port of the ARM Trusted Firmware on the Juno
development platform. This port does not support a BL3-2 image or any PSCI APIs
apart from PSCI_VERSION and PSCI_CPU_ON. It enables workarounds for selected
Cortex-A57 (#806969 & #813420) errata and implements the workaround for a Juno
platform errata (Defect id 831273).
Change-Id: Ib3d92df3af53820cfbb2977582ed0d7abf6ef893
diff --git a/plat/juno/scpi.c b/plat/juno/scpi.c
new file mode 100644
index 0000000..c1677aa
--- /dev/null
+++ b/plat/juno/scpi.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arch_helpers.h>
+#include <platform.h>
+#include "juno_def.h"
+#include "mhu.h"
+#include "scpi.h"
+
+#define MHU_SECURE_SCP_TO_AP_PAYLOAD (MHU_SECURE_BASE+0x0080)
+#define MHU_SECURE_AP_TO_SCP_PAYLOAD (MHU_SECURE_BASE+0x0280)
+
+#define SIZE_SHIFT 20 /* Bit position for size value in MHU header */
+#define SIZE_MASK 0x1ff /* Mask to extract size value in MHU header*/
+
+
+void *scpi_secure_message_start(void)
+{
+ mhu_secure_message_start();
+
+ /* Return address of payload area. */
+ return (void *)MHU_SECURE_AP_TO_SCP_PAYLOAD;
+}
+
+void scpi_secure_message_send(unsigned command, size_t size)
+{
+ /* Make sure payload can be seen by SCP */
+ if (MHU_PAYLOAD_CACHED)
+ flush_dcache_range(MHU_SECURE_AP_TO_SCP_PAYLOAD, size);
+
+ mhu_secure_message_send(command | (size << SIZE_SHIFT));
+}
+
+unsigned scpi_secure_message_receive(void **message_out, size_t *size_out)
+{
+ uint32_t response = mhu_secure_message_wait();
+
+ /* Get size of payload */
+ size_t size = (response >> SIZE_SHIFT) & SIZE_MASK;
+
+ /* Clear size from response */
+ response &= ~(SIZE_MASK << SIZE_SHIFT);
+
+ /* Make sure we don't read stale data */
+ if (MHU_PAYLOAD_CACHED)
+ inv_dcache_range(MHU_SECURE_SCP_TO_AP_PAYLOAD, size);
+
+ if (size_out)
+ *size_out = size;
+
+ if (message_out)
+ *message_out = (void *)MHU_SECURE_SCP_TO_AP_PAYLOAD;
+
+ return response;
+}
+
+void scpi_secure_message_end(void)
+{
+ mhu_secure_message_end();
+}
+
+static void scpi_secure_send32(unsigned command, uint32_t message)
+{
+ *(__typeof__(message) *)scpi_secure_message_start() = message;
+ scpi_secure_message_send(command, sizeof(message));
+ scpi_secure_message_end();
+}
+
+int scpi_wait_ready(void)
+{
+ /* Get a message from the SCP */
+ scpi_secure_message_start();
+ size_t size;
+ unsigned command = scpi_secure_message_receive(NULL, &size);
+ scpi_secure_message_end();
+
+ /* We are expecting 'SCP Ready', produce correct error if it's not */
+ scpi_status_t response = SCP_OK;
+ if (command != SCPI_CMD_SCP_READY)
+ response = SCP_E_SUPPORT;
+ else if (size != 0)
+ response = SCP_E_SIZE;
+
+ /* Send our response back to SCP */
+ scpi_secure_send32(command, response);
+
+ return response == SCP_OK ? 0 : -1;
+}
+
+void scpi_set_css_power_state(unsigned mpidr, scpi_power_state_t cpu_state,
+ scpi_power_state_t cluster_state, scpi_power_state_t css_state)
+{
+ uint32_t state = mpidr & 0x0f; /* CPU ID */
+ state |= (mpidr & 0xf00) >> 4; /* Cluster ID */
+ state |= cpu_state << 8;
+ state |= cluster_state << 12;
+ state |= css_state << 16;
+ scpi_secure_send32(SCPI_CMD_SET_CSS_POWER_STATE, state);
+}