@@ -16,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
+#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_reserved_mem.h>
@@ -24,10 +25,13 @@
#include <linux/remoteproc.h>
#include <linux/mailbox_client.h>
#include <linux/omap-mailbox.h>
+#include <linux/omap-iommu.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/reset.h>
#include <clocksource/timer-ti-dm.h>
+#include <linux/clk.h>
+#include <linux/clk/ti.h>
#include <linux/platform_data/dmtimer-omap.h>
@@ -85,6 +89,9 @@ struct omap_rproc_timer {
* @timers: timer(s) info used by rproc
* @rproc: rproc handle
* @reset: reset handle
+ * @pm_comp: completion primitive to sync for suspend response
+ * @fck: functional clock for the remoteproc
+ * @suspend_acked: state machine flag to store the suspend request ack
*/
struct omap_rproc {
struct mbox_chan *mbox;
@@ -96,6 +103,9 @@ struct omap_rproc {
struct omap_rproc_timer *timers;
struct rproc *rproc;
struct reset_control *reset;
+ struct completion pm_comp;
+ struct clk *fck;
+ bool suspend_acked;
};
/**
@@ -346,6 +356,11 @@ static void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
case RP_MBOX_ECHO_REPLY:
dev_info(dev, "received echo reply from %s\n", name);
break;
+ case RP_MBOX_SUSPEND_ACK:
+ case RP_MBOX_SUSPEND_CANCEL:
+ oproc->suspend_acked = msg == RP_MBOX_SUSPEND_ACK;
+ complete(&oproc->pm_comp);
+ break;
default:
if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
return;
@@ -522,6 +537,157 @@ static const struct rproc_ops omap_rproc_ops = {
.da_to_va = omap_rproc_da_to_va,
};
+#ifdef CONFIG_PM
+static bool _is_rproc_in_standby(struct omap_rproc *oproc)
+{
+ return ti_clk_is_in_standby(oproc->fck);
+}
+
+/* 1 sec is long enough time to let the remoteproc side suspend the device */
+#define DEF_SUSPEND_TIMEOUT 1000
+static int _omap_rproc_suspend(struct rproc *rproc)
+{
+ struct device *dev = rproc->dev.parent;
+ struct omap_rproc *oproc = rproc->priv;
+ unsigned long to = msecs_to_jiffies(DEF_SUSPEND_TIMEOUT);
+ unsigned long ta = jiffies + to;
+ int ret;
+
+ reinit_completion(&oproc->pm_comp);
+ oproc->suspend_acked = false;
+ ret = mbox_send_message(oproc->mbox, (void *)RP_MBOX_SUSPEND_SYSTEM);
+ if (ret < 0) {
+ dev_err(dev, "PM mbox_send_message failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = wait_for_completion_timeout(&oproc->pm_comp, to);
+ if (!oproc->suspend_acked)
+ return -EBUSY;
+
+ /*
+ * The remoteproc side is returning the ACK message before saving the
+ * context, because the context saving is performed within a SYS/BIOS
+ * function, and it cannot have any inter-dependencies against the IPC
+ * layer. Also, as the SYS/BIOS needs to preserve properly the processor
+ * register set, sending this ACK or signalling the completion of the
+ * context save through a shared memory variable can never be the
+ * absolute last thing to be executed on the remoteproc side, and the
+ * MPU cannot use the ACK message as a sync point to put the remoteproc
+ * into reset. The only way to ensure that the remote processor has
+ * completed saving the context is to check that the module has reached
+ * STANDBY state (after saving the context, the SYS/BIOS executes the
+ * appropriate target-specific WFI instruction causing the module to
+ * enter STANDBY).
+ */
+ while (!_is_rproc_in_standby(oproc)) {
+ if (time_after(jiffies, ta))
+ return -ETIME;
+ schedule();
+ }
+
+ reset_control_assert(oproc->reset);
+
+ ret = omap_rproc_disable_timers(rproc, false);
+ if (ret) {
+ dev_err(dev, "disabling timers during suspend failed %d\n",
+ ret);
+ goto enable_device;
+ }
+
+ return 0;
+
+enable_device:
+ reset_control_deassert(oproc->reset);
+ return ret;
+}
+
+static int _omap_rproc_resume(struct rproc *rproc)
+{
+ struct device *dev = rproc->dev.parent;
+ struct omap_rproc *oproc = rproc->priv;
+ int ret;
+
+ /* boot address could be lost after suspend, so restore it */
+ if (oproc->boot_data) {
+ ret = omap_rproc_write_dsp_boot_addr(rproc);
+ if (ret) {
+ dev_err(dev, "boot address restore failed %d\n", ret);
+ goto out;
+ }
+ }
+
+ ret = omap_rproc_enable_timers(rproc, false);
+ if (ret) {
+ dev_err(dev, "enabling timers during resume failed %d\n",
+ ret);
+ goto out;
+ }
+
+ reset_control_deassert(oproc->reset);
+
+out:
+ return ret;
+}
+
+static int __maybe_unused omap_rproc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rproc *rproc = platform_get_drvdata(pdev);
+ int ret = 0;
+
+ mutex_lock(&rproc->lock);
+ if (rproc->state == RPROC_OFFLINE)
+ goto out;
+
+ if (rproc->state == RPROC_SUSPENDED)
+ goto out;
+
+ if (rproc->state != RPROC_RUNNING) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ ret = _omap_rproc_suspend(rproc);
+ if (ret) {
+ dev_err(dev, "suspend failed %d\n", ret);
+ goto out;
+ }
+
+ rproc->state = RPROC_SUSPENDED;
+out:
+ mutex_unlock(&rproc->lock);
+ return ret;
+}
+
+static int __maybe_unused omap_rproc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rproc *rproc = platform_get_drvdata(pdev);
+ int ret = 0;
+
+ mutex_lock(&rproc->lock);
+ if (rproc->state == RPROC_OFFLINE)
+ goto out;
+
+ if (rproc->state != RPROC_SUSPENDED) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ ret = _omap_rproc_resume(rproc);
+ if (ret) {
+ dev_err(dev, "resume failed %d\n", ret);
+ goto out;
+ }
+
+ rproc->state = RPROC_RUNNING;
+out:
+ mutex_unlock(&rproc->lock);
+ return ret;
+}
+#endif /* CONFIG_PM */
+
static const struct omap_rproc_dev_data omap4_dsp_dev_data = {
.device_name = "dsp",
.fw_name = "omap4-dsp-fw.xe64T",
@@ -806,6 +972,14 @@ static int omap_rproc_probe(struct platform_device *pdev)
oproc->num_timers);
}
+ init_completion(&oproc->pm_comp);
+
+ oproc->fck = of_clk_get(np, 0);
+ if (IS_ERR(oproc->fck)) {
+ ret = PTR_ERR(oproc->fck);
+ goto free_rproc;
+ }
+
ret = of_reserved_mem_device_init(&pdev->dev);
if (ret) {
dev_err(&pdev->dev, "device does not have specific CMA pool\n");
@@ -823,6 +997,7 @@ static int omap_rproc_probe(struct platform_device *pdev)
release_mem:
of_reserved_mem_device_release(&pdev->dev);
free_rproc:
+ clk_put(oproc->fck);
rproc_free(rproc);
return ret;
}
@@ -838,11 +1013,16 @@ static int omap_rproc_remove(struct platform_device *pdev)
return 0;
}
+static const struct dev_pm_ops omap_rproc_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(omap_rproc_suspend, omap_rproc_resume)
+};
+
static struct platform_driver omap_rproc_driver = {
.probe = omap_rproc_probe,
.remove = omap_rproc_remove,
.driver = {
.name = "omap-rproc",
+ .pm = &omap_rproc_pm_ops,
.of_match_table = omap_rproc_of_match,
},
};
@@ -2,7 +2,7 @@
/*
* Remote processor messaging
*
- * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011-2018 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
* All rights reserved.
*/
@@ -32,6 +32,16 @@
* @RP_MBOX_ABORT_REQUEST: a "please crash" request, used for testing the
* recovery mechanism (to some extent).
*
+ * @RP_MBOX_SUSPEND_AUTO: auto suspend request for the remote processor
+ *
+ * @RP_MBOX_SUSPEND_SYSTEM: system suspend request for the remote processor
+ *
+ * @RP_MBOX_SUSPEND_ACK: successful response from remote processor for a
+ * suspend request
+ *
+ * @RP_MBOX_SUSPEND_CANCEL: a cancel suspend response from a remote processor
+ * on a suspend request
+ *
* Introduce new message definitions if any here.
*
* @RP_MBOX_END_MSG: Indicates end of known/defined messages from remote core
@@ -45,7 +55,11 @@ enum omap_rp_mbox_messages {
RP_MBOX_ECHO_REQUEST = 0xFFFFFF03,
RP_MBOX_ECHO_REPLY = 0xFFFFFF04,
RP_MBOX_ABORT_REQUEST = 0xFFFFFF05,
- RP_MBOX_END_MSG = 0xFFFFFF06,
+ RP_MBOX_SUSPEND_AUTO = 0xFFFFFF10,
+ RP_MBOX_SUSPEND_SYSTEM = 0xFFFFFF11,
+ RP_MBOX_SUSPEND_ACK = 0xFFFFFF12,
+ RP_MBOX_SUSPEND_CANCEL = 0xFFFFFF13,
+ RP_MBOX_END_MSG = 0xFFFFFF14,
};
#endif /* _OMAP_RPMSG_H */