1 files changed, 271 insertions, 0 deletions
diff --git a/plat/juno/plat_pm.c b/plat/juno/plat_pm.c
new file mode 100644
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+++ b/plat/juno/plat_pm.c
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+/*
+ * Copyright (c) 2013, 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 <assert.h>
+#include <arch_helpers.h>
+#include <cci400.h>
+#include <platform.h>
+#include <platform_def.h>
+#include <psci.h>
+#include "juno_def.h"
+#include "juno_private.h"
+#include "scpi.h"
+
+typedef struct {
+	/* Align the suspend level to allow per-cpu lockless access */
+	uint32_t state[MPIDR_MAX_AFFLVL]  __aligned(CACHE_WRITEBACK_GRANULE);
+} scp_pstate;
+
+static scp_pstate target_pstate[PLATFORM_CORE_COUNT];
+
+int pm_on(unsigned long mpidr,
+		   unsigned long sec_entrypoint,
+		   unsigned long ns_entrypoint,
+		   unsigned int afflvl,
+		   unsigned int state)
+{
+	/*
+	 * SCP takes care of powering up higher affinity levels so we
+	 * only need to care about level 0
+	 */
+	if (afflvl != MPIDR_AFFLVL0)
+		return PSCI_E_SUCCESS;
+
+	/*
+	 * Setup mailbox with address for CPU entrypoint when it next powers up
+	 */
+	unsigned long *mbox = (unsigned long *)(unsigned long)(
+			TRUSTED_MAILBOXES_BASE +
+			(platform_get_core_pos(mpidr) << TRUSTED_MAILBOX_SHIFT)
+			);
+	*mbox = sec_entrypoint;
+	flush_dcache_range((unsigned long)mbox, sizeof(*mbox));
+
+	scpi_set_css_power_state(mpidr, scpi_power_on, scpi_power_on,
+				 scpi_power_on);
+
+	return PSCI_E_SUCCESS;
+}
+
+int pm_on_finish(unsigned long mpidr, unsigned int afflvl, unsigned int state)
+{
+	switch (afflvl) {
+
+	case MPIDR_AFFLVL1:
+		/* Enable coherency if this cluster was off */
+		if (state == PSCI_STATE_OFF)
+			cci_enable_coherency(mpidr);
+		break;
+
+	case MPIDR_AFFLVL0:
+		/*
+		 * Ignore the state passed for a cpu. It could only have
+		 * been off if we are here.
+		 */
+
+		/* Turn on intra-cluster coherency. */
+		write_cpuectlr(read_cpuectlr() | CPUECTLR_SMP_BIT);
+
+		/* Enable the gic cpu interface */
+		gic_cpuif_setup(GICC_BASE);
+		/* Juno todo: Is this setup only needed after a cold boot? */
+		gic_pcpu_distif_setup(GICD_BASE);
+
+		/*
+		 * Clear the mailbox for each cpu
+		 */
+		unsigned long *mbox = (unsigned long *)(unsigned long)(
+			TRUSTED_MAILBOXES_BASE +
+			(platform_get_core_pos(mpidr) << TRUSTED_MAILBOX_SHIFT)
+			);
+		*mbox = 0;
+		flush_dcache_range((unsigned long)mbox, sizeof(*mbox));
+
+		break;
+	}
+
+	return PSCI_E_SUCCESS;
+}
+
+/*******************************************************************************
+ * Common function called while turning a cpu off or suspending it. It is called
+ * for each affinity level until the target affinity level. It keeps track of
+ * the power state that needs to be programmed through the SCP firmware for each
+ * affinity level. Once the target affinity level is reached it uses the MHU
+ * channel to ask the SCP to perform the power operations for each affinity
+ * level accumulated so far.
+ *
+ * CAUTION: This function is called with coherent stacks so that caches can be
+ * turned off, flushed and coherency disabled. There is no guarantee that caches
+ * will remain turned on across calls to this function as each affinity level is
+ * dealt with. So do not write & read global variables across calls. It will be
+ * wise to do flush a write to the global to prevent unpredictable results.
+ ******************************************************************************/
+static int juno_power_down_common(unsigned long mpidr,
+				  unsigned int linear_id,
+				  unsigned int cur_afflvl,
+				  unsigned int tgt_afflvl,
+				  unsigned int state)
+{
+	/* Record which power state this affinity level is supposed to enter */
+	if (state == PSCI_STATE_OFF) {
+		target_pstate[linear_id].state[cur_afflvl] = scpi_power_off;
+	} else {
+		assert(cur_afflvl != MPIDR_AFFLVL0);
+		target_pstate[linear_id].state[cur_afflvl] = scpi_power_on;
+		goto exit;
+	}
+
+	switch (cur_afflvl) {
+	case MPIDR_AFFLVL1:
+		/* Cluster is to be turned off, so disable coherency */
+		cci_disable_coherency(mpidr);
+
+		break;
+
+	case MPIDR_AFFLVL0:
+		/* Turn off intra-cluster coherency */
+		write_cpuectlr(read_cpuectlr() & ~CPUECTLR_SMP_BIT);
+
+		/* Prevent interrupts from spuriously waking up this cpu */
+		gic_cpuif_deactivate(GICC_BASE);
+
+		break;
+	}
+
+exit:
+	/*
+	 * If this is the target affinity level then we need to ask the SCP
+	 * to power down the appropriate components depending upon their state
+	 */
+	if (cur_afflvl == tgt_afflvl) {
+		scpi_set_css_power_state(mpidr,
+					target_pstate[linear_id].state[MPIDR_AFFLVL0],
+					 target_pstate[linear_id].state[MPIDR_AFFLVL1],
+					 scpi_power_on);
+
+		/* Reset the states */
+		target_pstate[linear_id].state[MPIDR_AFFLVL0] = scpi_power_on;
+		target_pstate[linear_id].state[MPIDR_AFFLVL1] = scpi_power_on;
+	}
+
+	return PSCI_E_SUCCESS;
+}
+
+/*******************************************************************************
+ * Handler called when an affinity instance is about to be turned off. The
+ * level and mpidr determine the affinity instance. The 'state' arg. allows the
+ * platform to decide whether the cluster is being turned off and take apt
+ * actions.
+ *
+ * CAUTION: This function is called with coherent stacks so that caches can be
+ * turned off, flushed and coherency disabled. There is no guarantee that caches
+ * will remain turned on across calls to this function as each affinity level is
+ * dealt with. So do not write & read global variables across calls. It will be
+ * wise to do flush a write to the global to prevent unpredictable results.
+ ******************************************************************************/
+int pm_off(unsigned long mpidr, unsigned int afflvl, unsigned int state)
+{
+	return juno_power_down_common(mpidr,
+				      platform_get_core_pos(mpidr),
+				      afflvl,
+				      plat_get_max_afflvl(),
+				      state);
+}
+
+/*******************************************************************************
+ * Handler called when an affinity instance is about to be suspended. The
+ * level and mpidr determine the affinity instance. The 'state' arg. allows the
+ * platform to decide whether the cluster is being turned off and take apt
+ * actions. The 'sec_entrypoint' determines the address in BL3-1 from where
+ * execution should resume.
+ *
+ * CAUTION: This function is called with coherent stacks so that caches can be
+ * turned off, flushed and coherency disabled. There is no guarantee that caches
+ * will remain turned on across calls to this function as each affinity level is
+ * dealt with. So do not write & read global variables across calls. It will be
+ * wise to do flush a write to the global to prevent unpredictable results.
+ ******************************************************************************/
+int pm_suspend(unsigned long mpidr,
+	       unsigned long sec_entrypoint,
+	       unsigned long ns_entrypoint,
+	       unsigned int afflvl,
+	       unsigned int state)
+{
+	uint32_t tgt_afflvl;
+
+	tgt_afflvl = psci_get_suspend_afflvl(mpidr);
+	assert(tgt_afflvl != PSCI_INVALID_DATA);
+
+	/*
+	 * Setup mailbox with address for CPU entrypoint when it next powers up
+	 */
+	if (afflvl == MPIDR_AFFLVL0) {
+		unsigned long *mbox = (unsigned long *)(unsigned long)(
+			TRUSTED_MAILBOXES_BASE +
+			(platform_get_core_pos(mpidr) << TRUSTED_MAILBOX_SHIFT)
+			);
+		*mbox = sec_entrypoint;
+		flush_dcache_range((unsigned long)mbox, sizeof(*mbox));
+	}
+
+	return juno_power_down_common(mpidr,
+				      platform_get_core_pos(mpidr),
+				      afflvl,
+				      tgt_afflvl,
+				      state);
+}
+
+int pm_suspend_finish(unsigned long mpidr,
+		      unsigned int afflvl,
+		      unsigned int state)
+{
+	return pm_on_finish(mpidr, afflvl, state);
+}
+
+/*******************************************************************************
+ * Export the platform handlers to enable psci to invoke them
+ ******************************************************************************/
+static const plat_pm_ops_t pm_ops = {
+	.affinst_on		= pm_on,
+	.affinst_on_finish	= pm_on_finish,
+	.affinst_off		= pm_off,
+	.affinst_suspend	= pm_suspend,
+	.affinst_suspend_finish	= pm_suspend_finish
+};
+
+/*******************************************************************************
+ * Export the platform specific power ops & initialize the fvp power controller
+ ******************************************************************************/
+int platform_setup_pm(const plat_pm_ops_t **plat_ops)
+{
+	*plat_ops = &pm_ops;
+	return 0;
+}