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From:   M Chetan Kumar <m.chetan.kumar@intel.com>
To:     netdev@vger.kernel.org, linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net, krishna.c.sudi@intel.com,
        m.chetan.kumar@intel.com
Subject: [RFC 12/18] net: iosm: power management
Date:   Mon, 23 Nov 2020 19:21:17 +0530
Message-Id: <20201123135123.48892-13-m.chetan.kumar@intel.com>
In-Reply-To: <20201123135123.48892-1-m.chetan.kumar@intel.com>
References: <20201123135123.48892-1-m.chetan.kumar@intel.com>
Precedence: bulk

Implements state machine to handle host & device sleep.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@intel.com>
---
 drivers/net/wwan/iosm/iosm_ipc_pm.c | 334 ++++++++++++++++++++++++++++++++++++
 drivers/net/wwan/iosm/iosm_ipc_pm.h | 216 +++++++++++++++++++++++
 2 files changed, 550 insertions(+)
 create mode 100644 drivers/net/wwan/iosm/iosm_ipc_pm.c
 create mode 100644 drivers/net/wwan/iosm/iosm_ipc_pm.h

diff --git a/drivers/net/wwan/iosm/iosm_ipc_pm.c b/drivers/net/wwan/iosm/iosm_ipc_pm.c
new file mode 100644
index 000000000000..662f8f309ec0
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_pm.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Intel Corporation.
+ */
+
+#include "iosm_ipc_protocol.h"
+#include "iosm_ipc_task_queue.h"
+
+/* Timeout value in MS for the PM to wait for device to reach active state */
+#define IPC_PM_ACTIVE_TIMEOUT_MS (500)
+
+/* Value definitions for union ipc_pm_cond members.
+ *
+ * Note that here "active" has the value 1, as compared to the enums
+ * ipc_mem_host_pm_state or ipc_mem_dev_pm_state, where "active" is 0
+ */
+#define IPC_PM_SLEEP (0)
+#define IPC_PM_ACTIVE (1)
+
+/* Trigger the doorbell interrupt on cp to change the PM sleep/active status */
+#define ipc_cp_irq_sleep_control(ipc_pcie, data)                               \
+	ipc_doorbell_fire(ipc_pcie, IPC_DOORBELL_IRQ_SLEEP, data)
+
+/* Trigger the doorbell interrupt on CP to do hpda update */
+#define ipc_cp_irq_hpda_update(ipc_pcie, data)                                 \
+	ipc_doorbell_fire(ipc_pcie, IPC_DOORBELL_IRQ_HPDA, 0xFF & (data))
+
+void ipc_pm_signal_hpda_doorbell(struct iosm_pm *ipc_pm, u32 identifier,
+				 bool host_slp_check)
+{
+	if (host_slp_check && ipc_pm->host_pm_state != IPC_MEM_HOST_PM_ACTIVE &&
+	    ipc_pm->host_pm_state != IPC_MEM_HOST_PM_ACTIVE_WAIT) {
+		ipc_pm->pending_hpda_update = true;
+		dev_dbg(ipc_pm->dev,
+			"Pending HPDA update set. Host PM_State: %d identifier:%d",
+			ipc_pm->host_pm_state, identifier);
+		return;
+	}
+
+	if (!ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_IRQ, true)) {
+		ipc_pm->pending_hpda_update = true;
+		dev_dbg(ipc_pm->dev, "Pending HPDA update set. identifier:%d",
+			identifier);
+		return;
+	}
+	ipc_pm->pending_hpda_update = false;
+
+	/* Trigger the irq towards CP */
+	ipc_cp_irq_hpda_update(ipc_pm->pcie, identifier);
+
+	ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_IRQ, false);
+}
+
+/* Wake up the device if it is in low power mode. */
+static bool ipc_pm_link_activate(struct iosm_pm *ipc_pm)
+{
+	if (ipc_pm->cp_state == IPC_MEM_DEV_PM_ACTIVE)
+		return true;
+
+	if (ipc_pm->cp_state == IPC_MEM_DEV_PM_SLEEP) {
+		if (ipc_pm->ap_state == IPC_MEM_DEV_PM_SLEEP) {
+			/* Wake up the device. */
+			ipc_cp_irq_sleep_control(ipc_pm->pcie,
+						 IPC_MEM_DEV_PM_WAKEUP);
+			ipc_pm->ap_state = IPC_MEM_DEV_PM_ACTIVE_WAIT;
+
+			return false;
+		}
+
+		if (ipc_pm->ap_state == IPC_MEM_DEV_PM_ACTIVE_WAIT)
+			return false;
+
+		return true;
+	}
+
+	/* link is not ready */
+	return false;
+}
+
+void ipc_pm_host_slp_reinit_dev_active_completion(struct iosm_pm *ipc_pm)
+{
+	if (!ipc_pm)
+		return;
+
+	atomic_set(&ipc_pm->host_sleep_pend, 1);
+
+	reinit_completion(&ipc_pm->host_sleep_complete);
+}
+
+bool ipc_pm_wait_for_device_active(struct iosm_pm *ipc_pm)
+{
+	bool ret_val = false;
+
+	if (ipc_pm->ap_state != IPC_MEM_DEV_PM_ACTIVE)
+
+		/* Wait for IPC_PM_ACTIVE_TIMEOUT_MS for Device sleep state
+		 * machine to enter ACTIVE state.
+		 */
+		if (!WAIT_FOR_TIMEOUT(&ipc_pm->host_sleep_complete,
+				      IPC_PM_ACTIVE_TIMEOUT_MS)) {
+			dev_err(ipc_pm->dev,
+				"PM timeout. Expected State:%d. Actual: %d",
+				IPC_MEM_DEV_PM_ACTIVE, ipc_pm->ap_state);
+			goto  active_timeout;
+		}
+
+	ret_val = true;
+active_timeout:
+	/* Reset the atomic variable in any case as device sleep
+	 * state machine change is no longer of interest.
+	 */
+	atomic_set(&ipc_pm->host_sleep_pend, 0);
+
+	return ret_val;
+}
+
+static void ipc_pm_on_link_sleep(struct iosm_pm *ipc_pm)
+{
+	/* pending sleep ack and all conditions are cleared
+	 * -> signal SLEEP__ACK to CP
+	 */
+	ipc_pm->cp_state = IPC_MEM_DEV_PM_SLEEP;
+	ipc_pm->ap_state = IPC_MEM_DEV_PM_SLEEP;
+
+	ipc_cp_irq_sleep_control(ipc_pm->pcie, IPC_MEM_DEV_PM_SLEEP);
+}
+
+static void ipc_pm_on_link_wake(struct iosm_pm *ipc_pm, bool ack)
+{
+	ipc_pm->ap_state = IPC_MEM_DEV_PM_ACTIVE;
+
+	if (ack) {
+		ipc_pm->cp_state = IPC_MEM_DEV_PM_ACTIVE;
+
+		ipc_cp_irq_sleep_control(ipc_pm->pcie, IPC_MEM_DEV_PM_ACTIVE);
+
+		/* check the consume state !!! */
+		if (atomic_cmpxchg(&ipc_pm->host_sleep_pend, 1, 0))
+			complete(&ipc_pm->host_sleep_complete);
+	}
+
+	/* Check for pending HPDA update.
+	 * Pending HP update could be because of sending message was
+	 * put on hold due to Device sleep state or due to TD update
+	 * which could be because of Device Sleep and Host Sleep
+	 * states.
+	 */
+	if (ipc_pm->pending_hpda_update &&
+	    ipc_pm->host_pm_state == IPC_MEM_HOST_PM_ACTIVE)
+		ipc_pm_signal_hpda_doorbell(ipc_pm, IPC_HP_PM_TRIGGER, true);
+}
+
+bool ipc_pm_trigger(struct iosm_pm *ipc_pm, enum ipc_pm_unit unit, bool active)
+{
+	union ipc_pm_cond old_cond;
+	union ipc_pm_cond new_cond;
+	bool link_active;
+
+	/* Save the current D3 state. */
+	new_cond = ipc_pm->pm_cond;
+	old_cond = ipc_pm->pm_cond;
+
+	/* Calculate the power state only in the runtime phase. */
+	switch (unit) {
+	case IPC_PM_UNIT_IRQ: /* CP irq */
+		new_cond.irq = active;
+		break;
+
+	case IPC_PM_UNIT_LINK: /* Device link state. */
+		new_cond.link = active;
+		break;
+
+	case IPC_PM_UNIT_HS: /* Host sleep trigger requires Link. */
+		new_cond.hs = active;
+		break;
+
+	default:
+		break;
+	}
+
+	/* Something changed ? */
+	if (old_cond.raw == new_cond.raw) {
+		/* Stay in the current PM state. */
+		link_active = old_cond.link == IPC_PM_ACTIVE;
+		goto ret;
+	}
+
+	ipc_pm->pm_cond = new_cond;
+
+	if (new_cond.link)
+		ipc_pm_on_link_wake(ipc_pm, unit == IPC_PM_UNIT_LINK);
+	else if (unit == IPC_PM_UNIT_LINK)
+		ipc_pm_on_link_sleep(ipc_pm);
+
+	if (old_cond.link == IPC_PM_SLEEP && new_cond.raw != 0) {
+		link_active = ipc_pm_link_activate(ipc_pm);
+		goto ret;
+	}
+
+	link_active = old_cond.link == IPC_PM_ACTIVE;
+
+ret:
+	return link_active;
+}
+
+bool ipc_pm_prepare_host_sleep(struct iosm_pm *ipc_pm)
+{
+	if (!ipc_pm)
+		return false;
+
+	/* suspend not allowed if host_pm_state is not IPC_MEM_HOST_PM_ACTIVE */
+	if (ipc_pm->host_pm_state != IPC_MEM_HOST_PM_ACTIVE) {
+		dev_err(ipc_pm->dev, "host_pm_state=%d\tExpected to be: %d",
+			ipc_pm->host_pm_state, IPC_MEM_HOST_PM_ACTIVE);
+		return false;
+	}
+
+	ipc_pm->host_pm_state = IPC_MEM_HOST_PM_SLEEP_WAIT_D3;
+
+	return true;
+}
+
+bool ipc_pm_prepare_host_active(struct iosm_pm *ipc_pm)
+{
+	if (!ipc_pm)
+		return false;
+
+	if (ipc_pm->host_pm_state != IPC_MEM_HOST_PM_SLEEP) {
+		dev_err(ipc_pm->dev, "host_pm_state=%d\tExpected to be: %d",
+			ipc_pm->host_pm_state, IPC_MEM_HOST_PM_SLEEP);
+		return false;
+	}
+
+	/* Sending Sleep Exit message to CP. Update the state */
+	ipc_pm->host_pm_state = IPC_MEM_HOST_PM_ACTIVE_WAIT;
+
+	return true;
+}
+
+bool ipc_pm_dev_slp_notification(struct iosm_pm *ipc_pm, u32 cp_pm_req)
+{
+	if (!ipc_pm)
+		return false;
+
+	if (cp_pm_req == ipc_pm->device_sleep_notification)
+		return false;
+
+	ipc_pm->device_sleep_notification = cp_pm_req;
+
+	/* Evaluate the PM request. */
+	switch (ipc_pm->cp_state) {
+	case IPC_MEM_DEV_PM_ACTIVE:
+		switch (cp_pm_req) {
+		case IPC_MEM_DEV_PM_ACTIVE:
+			break;
+
+		case IPC_MEM_DEV_PM_SLEEP:
+
+			/* Inform the PM that the device link can go down. */
+			ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_LINK, false);
+
+			return true;
+
+		default:
+			dev_err(ipc_pm->dev,
+				"loc-pm=(%d=active): confused req-pm=%d",
+				ipc_pm->cp_state, cp_pm_req);
+			break;
+		}
+		break;
+
+	case IPC_MEM_DEV_PM_SLEEP:
+		switch (cp_pm_req) {
+		case IPC_MEM_DEV_PM_ACTIVE:
+			/* Inform the PM that the device link is active. */
+			ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_LINK, true);
+			break;
+
+		case IPC_MEM_DEV_PM_SLEEP:
+			break;
+
+		default:
+			dev_err(ipc_pm->dev,
+				"loc-pm=(%d=sleep): confused req-pm=%d",
+				ipc_pm->cp_state, cp_pm_req);
+			break;
+		}
+		break;
+
+	default:
+		dev_err(ipc_pm->dev, "confused loc-pm=%d, req-pm=%d",
+			ipc_pm->cp_state, cp_pm_req);
+		break;
+	}
+
+	return false;
+}
+
+struct iosm_pm *ipc_pm_init(struct iosm_imem *ipc_imem)
+{
+	struct iosm_pm *ipc_pm = kzalloc(sizeof(*ipc_pm), GFP_KERNEL);
+
+	if (!ipc_pm)
+		return NULL;
+
+	ipc_pm->pcie = ipc_imem->pcie;
+	ipc_pm->dev = ipc_imem->dev;
+
+	ipc_pm->pm_cond.irq = IPC_PM_SLEEP;
+	ipc_pm->pm_cond.hs = IPC_PM_SLEEP;
+	ipc_pm->pm_cond.link = IPC_PM_ACTIVE;
+
+	ipc_pm->cp_state = IPC_MEM_DEV_PM_ACTIVE;
+	ipc_pm->ap_state = IPC_MEM_DEV_PM_ACTIVE;
+	ipc_pm->host_pm_state = IPC_MEM_HOST_PM_ACTIVE;
+
+	ipc_pm->ipc_tasklet = ipc_imem->ipc_tasklet;
+	ipc_pm->ipc_task = ipc_imem->ipc_task;
+
+	/* Create generic wait-for-completion handler for Host Sleep
+	 * and device sleep coordination.
+	 */
+	init_completion(&ipc_pm->host_sleep_complete);
+
+	atomic_set(&ipc_pm->host_sleep_pend, 0);
+
+	return ipc_pm;
+}
+
+void ipc_pm_deinit(struct iosm_pm *ipc_pm)
+{
+	complete(&ipc_pm->host_sleep_complete);
+	kfree(ipc_pm);
+}
diff --git a/drivers/net/wwan/iosm/iosm_ipc_pm.h b/drivers/net/wwan/iosm/iosm_ipc_pm.h
new file mode 100644
index 000000000000..f09a90fe43df
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_pm.h
@@ -0,0 +1,216 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2020 Intel Corporation.
+ */
+
+#ifndef IOSM_IPC_PM_H
+#define IOSM_IPC_PM_H
+
+#include <linux/interrupt.h>
+
+/**
+ * union ipc_pm_cond - Conditions for D3 and the sleep message to CP.
+ * @raw:	raw/combined value for faster check
+ * @irq:	IRQ towards CP
+ * @hs:		Host Sleep
+ * @link:	Device link state.
+ */
+union ipc_pm_cond {
+	unsigned int raw;
+
+	struct {
+		unsigned int irq : 1;
+		unsigned int hs : 1;
+		unsigned int link : 1;
+	};
+};
+
+/**
+ * enum ipc_mem_host_pm_state - Possible states of the SLEEP finite state
+ *				machine.
+ * @IPC_MEM_HOST_PM_ACTIVE:		   Host is active
+ * @IPC_MEM_HOST_PM_ACTIVE_WAIT:	   Intermediate state before going to
+ *					   active
+ * @IPC_MEM_HOST_PM_SLEEP_WAIT_IDLE:	   Intermediate state to wait for idle
+ *					   before going into sleep
+ * @IPC_MEM_HOST_PM_SLEEP_WAIT_D3:	   Intermediate state to wait for D3
+ *					   before going to sleep
+ * @IPC_MEM_HOST_PM_SLEEP:		   after this state the interface is not
+ *					   accessible host is in suspend to RAM
+ * @IPC_MEM_HOST_PM_SLEEP_WAIT_EXIT_SLEEP: Intermediate state before exiting
+ *					   sleep
+ */
+enum ipc_mem_host_pm_state {
+	IPC_MEM_HOST_PM_ACTIVE,
+	IPC_MEM_HOST_PM_ACTIVE_WAIT,
+	IPC_MEM_HOST_PM_SLEEP_WAIT_IDLE,
+	IPC_MEM_HOST_PM_SLEEP_WAIT_D3,
+	IPC_MEM_HOST_PM_SLEEP,
+	IPC_MEM_HOST_PM_SLEEP_WAIT_EXIT_SLEEP,
+};
+
+/**
+ * enum ipc_mem_dev_pm_state - Possible states of the SLEEP finite state
+ *			       machine.
+ * @IPC_MEM_DEV_PM_ACTIVE:	IPC_MEM_DEV_PM_ACTIVE is the initial power
+ *				management state.
+ *				IRQ(struct
+ *				ipc_mem_device_info.device_sleep_notification)
+ *				and DOORBELL-IRQ-HPDA(data) values.
+ * @IPC_MEM_DEV_PM_SLEEP:	IPC_MEM_DEV_PM_SLEEP is PM state for sleep.
+ * @IPC_MEM_DEV_PM_WAKEUP:	DOORBELL-IRQ-DEVICE_WAKE(data).
+ * @IPC_MEM_DEV_PM_HOST_SLEEP:	DOORBELL-IRQ-HOST_SLEEP(data).
+ * @IPC_MEM_DEV_PM_ACTIVE_WAIT:	Local intermediate states.
+ *				Before AP triggers DOORBELL-IRQ-SLEEP(data)
+ *				either the intermediate device link state is
+ *				SYNC_ACTIVE_WAIT i.e. the user is blocked until
+ *				the link interworking was finished about IRQ and
+ *				DOORBELL-IRQ-HPDA or the intermediate device
+ *				link state is ACTIVE_WAIT i.e. the data transfer
+ *				starts after the DOORBELL-IRQ-HPDA
+ *				(IPC_MEM_DEV_PM_ACTIVE).
+ */
+enum ipc_mem_dev_pm_state {
+	IPC_MEM_DEV_PM_ACTIVE,
+	IPC_MEM_DEV_PM_SLEEP,
+	IPC_MEM_DEV_PM_WAKEUP,
+	IPC_MEM_DEV_PM_HOST_SLEEP,
+	IPC_MEM_DEV_PM_ACTIVE_WAIT,
+};
+
+/**
+ * struct iosm_pm - Power management instance data
+ * @pcie:			Pointer to iosm_pcie structure
+ * @dev:			Pointer to device structure
+ * @ipc_tasklet:		Tasklet instance
+ * @ipc_task:			Tasklet for scheduling a wakeup in task context
+ * @host_pm_state:		PM states for host
+ * @host_sleep_pend:		Variable to indicate Host Sleep Pending
+ * @host_sleep_complete:	Generic wait-for-completion used in
+ *				case of Host Sleep
+ * @pm_cond:			Conditions for power management
+ * @ap_state:			Current power management state, the
+ *				initial state is IPC_MEM_DEV_PM_ACTIVE eq. 0.
+ * @cp_state:			PM State of CP
+ * @device_sleep_notification:	last handled device_sleep_notfication
+ * @pending_hpda_update:	is a HPDA update pending?
+ */
+struct iosm_pm {
+	struct iosm_pcie *pcie;
+	struct device *dev;
+	struct tasklet_struct *ipc_tasklet;
+	struct ipc_task_queue *ipc_task;
+	enum ipc_mem_host_pm_state host_pm_state;
+	atomic_t host_sleep_pend;
+	struct completion host_sleep_complete;
+	union ipc_pm_cond pm_cond;
+	enum ipc_mem_dev_pm_state ap_state;
+	enum ipc_mem_dev_pm_state cp_state;
+	u32 device_sleep_notification;
+	u8 pending_hpda_update : 1;
+};
+
+/**
+ * enum ipc_pm_unit - Power management units.
+ * @IPC_PM_UNIT_IRQ:	IRQ towards CP
+ * @IPC_PM_UNIT_HS:	Host Sleep for converged protocol
+ * @IPC_PM_UNIT_LINK:	Link state controlled by CP.
+ */
+enum ipc_pm_unit {
+	IPC_PM_UNIT_IRQ, /* IRQ towards CP */
+	IPC_PM_UNIT_HS, /* Host Sleep for converged protocol */
+	IPC_PM_UNIT_LINK, /* Link state controlled by CP. */
+};
+
+/**
+ * ipc_pm_init - Allocate power management component
+ * @ipc_imem:	Pointer to iosm_imem structure
+ *
+ * Returns: pointer to allocated PM component or NULL on failure.
+ */
+struct iosm_pm *ipc_pm_init(struct iosm_imem *ipc_imem);
+
+/**
+ * ipc_pm_deinit - Free power management component, invalidating its pointer.
+ * @ipc_pm:	Pointer to pm component.
+ */
+void ipc_pm_deinit(struct iosm_pm *ipc_pm);
+
+/**
+ * ipc_pm_dev_slp_notification - Handle a sleep notification message from the
+ *				 device. This can be called from interrupt state
+ *				 This function handles Host Sleep requests too
+ *				 if the Host Sleep protocol is register based.
+ * @ipc_pm:			Pointer to power management component
+ * @sleep_notification:		Actual notification from device
+ *
+ * Returns: true if dev sleep state has to be checked, false otherwise.
+ */
+bool ipc_pm_dev_slp_notification(struct iosm_pm *ipc_pm,
+				 u32 sleep_notification);
+
+/**
+ * ipc_pm_prepare_host_sleep - Prepare the PM for sleep by entering
+ *			       IPC_MEM_HOST_PM_SLEEP_WAIT_D3 state.
+ * @ipc_pm:	Pointer to power management component
+ *
+ * Returns: true on success, false if the host was not active.
+ */
+bool ipc_pm_prepare_host_sleep(struct iosm_pm *ipc_pm);
+
+/**
+ * ipc_pm_prepare_host_active - Prepare the PM for wakeup by entering
+ *				IPC_MEM_HOST_PM_ACTIVE_WAIT state.
+ * @ipc_pm:	Pointer to power management component
+ *
+ * Returns: true on success, false if the host was not sleeping.
+ */
+bool ipc_pm_prepare_host_active(struct iosm_pm *ipc_pm);
+
+/**
+ * ipc_pm_wait_for_device_active - Wait for up to IPC_PM_ACTIVE_TIMEOUT_MS ms
+ *				   for the device to reach active state
+ * @ipc_pm:	Pointer to power management component
+ *
+ * Returns: true if device is active
+ */
+bool ipc_pm_wait_for_device_active(struct iosm_pm *ipc_pm);
+
+/**
+ * ipc_pm_signal_hpda_doorbell - Wake up the device if it is in low power mode
+ *				 and trigger a head pointer update interrupt.
+ * @ipc_pm:		Pointer to power management component
+ * @identifier:		specifies what component triggered hpda update irq
+ * @host_slp_check:	if set to true then Host Sleep state machine check will
+ *			be performed. If Host Sleep state machine allows HP
+ *			update then only doorbell is triggered otherwise pending
+ *			flag will be set. If set to false then Host Sleep check
+ *			will not be performed. This is helpful for Host Sleep
+ *			negotiation through message ring.
+ */
+void ipc_pm_signal_hpda_doorbell(struct iosm_pm *ipc_pm, u32 identifier,
+				 bool host_slp_check);
+/**
+ * ipc_pm_host_slp_reinit_dev_active_completion - This function initializes
+ *						  the atomic variable and
+ *						  completion object used to
+ *						  get notification about
+ *						  Device Sleep state machine
+ *						  changed to ACTIVE state
+ *						  so that Sleep negotiation
+ *						  can be started.
+ * @ipc_pm:	Pointer to power management component
+ */
+void ipc_pm_host_slp_reinit_dev_active_completion(struct iosm_pm *ipc_pm);
+
+/**
+ * ipc_pm_trigger - Update power manager and wake up the link if needed
+ * @ipc_pm:	Pointer to power management component
+ * @unit:	Power management units
+ * @active:	Device link state
+ *
+ * Returns: true if link is active.
+ */
+bool ipc_pm_trigger(struct iosm_pm *ipc_pm, enum ipc_pm_unit unit, bool active);
+
+#endif
-- 
2.12.3