net: wwan: t7xx: Introduce power management

Implements suspend, resumes, freeze, thaw, poweroff, and restore
`dev_pm_ops` callbacks.

From the host point of view, the t7xx driver is one entity. But, the
device has several modules that need to be addressed in different ways
during power management (PM) flows.
The driver uses the term 'PM entities' to refer to the 2 DPMA and
2 CLDMA HW blocks that need to be managed during PM flows.
When a dev_pm_ops function is called, the PM entities list is iterated
and the matching function is called for each entry in the list.

Signed-off-by: Haijun Liu <haijun.liu@mediatek.com>
Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Co-developed-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Signed-off-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wwan/t7xx/t7xx_hif_cldma.c

@@ -1076,6 +1076,120 @@ int t7xx_cldma_alloc(enum cldma_id hif_id, struct t7xx_pci_dev *t7xx_dev)
 	return 0;
 }
 
+static void t7xx_cldma_resume_early(struct t7xx_pci_dev *t7xx_dev, void *entity_param)
+{
+	struct cldma_ctrl *md_ctrl = entity_param;
+	struct t7xx_cldma_hw *hw_info;
+	unsigned long flags;
+	int qno_t;
+
+	hw_info = &md_ctrl->hw_info;
+
+	spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+	t7xx_cldma_hw_restore(hw_info);
+	for (qno_t = 0; qno_t < CLDMA_TXQ_NUM; qno_t++) {
+		t7xx_cldma_hw_set_start_addr(hw_info, qno_t, md_ctrl->txq[qno_t].tx_next->gpd_addr,
+					     MTK_TX);
+		t7xx_cldma_hw_set_start_addr(hw_info, qno_t, md_ctrl->rxq[qno_t].tr_done->gpd_addr,
+					     MTK_RX);
+	}
+	t7xx_cldma_enable_irq(md_ctrl);
+	t7xx_cldma_hw_start_queue(hw_info, CLDMA_ALL_Q, MTK_RX);
+	md_ctrl->rxq_active |= TXRX_STATUS_BITMASK;
+	t7xx_cldma_hw_irq_en_eq(hw_info, CLDMA_ALL_Q, MTK_RX);
+	t7xx_cldma_hw_irq_en_txrx(hw_info, CLDMA_ALL_Q, MTK_RX);
+	spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static int t7xx_cldma_resume(struct t7xx_pci_dev *t7xx_dev, void *entity_param)
+{
+	struct cldma_ctrl *md_ctrl = entity_param;
+	unsigned long flags;
+
+	spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+	md_ctrl->txq_active |= TXRX_STATUS_BITMASK;
+	t7xx_cldma_hw_irq_en_txrx(&md_ctrl->hw_info, CLDMA_ALL_Q, MTK_TX);
+	t7xx_cldma_hw_irq_en_eq(&md_ctrl->hw_info, CLDMA_ALL_Q, MTK_TX);
+	spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+
+	if (md_ctrl->hif_id == CLDMA_ID_MD)
+		t7xx_mhccif_mask_clr(t7xx_dev, D2H_SW_INT_MASK);
+
+	return 0;
+}
+
+static void t7xx_cldma_suspend_late(struct t7xx_pci_dev *t7xx_dev, void *entity_param)
+{
+	struct cldma_ctrl *md_ctrl = entity_param;
+	struct t7xx_cldma_hw *hw_info;
+	unsigned long flags;
+
+	hw_info = &md_ctrl->hw_info;
+
+	spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+	t7xx_cldma_hw_irq_dis_eq(hw_info, CLDMA_ALL_Q, MTK_RX);
+	t7xx_cldma_hw_irq_dis_txrx(hw_info, CLDMA_ALL_Q, MTK_RX);
+	md_ctrl->rxq_active &= ~TXRX_STATUS_BITMASK;
+	t7xx_cldma_hw_stop_all_qs(hw_info, MTK_RX);
+	t7xx_cldma_clear_ip_busy(hw_info);
+	t7xx_cldma_disable_irq(md_ctrl);
+	spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static int t7xx_cldma_suspend(struct t7xx_pci_dev *t7xx_dev, void *entity_param)
+{
+	struct cldma_ctrl *md_ctrl = entity_param;
+	struct t7xx_cldma_hw *hw_info;
+	unsigned long flags;
+
+	if (md_ctrl->hif_id == CLDMA_ID_MD)
+		t7xx_mhccif_mask_set(t7xx_dev, D2H_SW_INT_MASK);
+
+	hw_info = &md_ctrl->hw_info;
+
+	spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+	t7xx_cldma_hw_irq_dis_eq(hw_info, CLDMA_ALL_Q, MTK_TX);
+	t7xx_cldma_hw_irq_dis_txrx(hw_info, CLDMA_ALL_Q, MTK_TX);
+	md_ctrl->txq_active &= ~TXRX_STATUS_BITMASK;
+	t7xx_cldma_hw_stop_all_qs(hw_info, MTK_TX);
+	md_ctrl->txq_started = 0;
+	spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+
+	return 0;
+}
+
+static int t7xx_cldma_pm_init(struct cldma_ctrl *md_ctrl)
+{
+	md_ctrl->pm_entity = kzalloc(sizeof(*md_ctrl->pm_entity), GFP_KERNEL);
+	if (!md_ctrl->pm_entity)
+		return -ENOMEM;
+
+	md_ctrl->pm_entity->entity_param = md_ctrl;
+
+	if (md_ctrl->hif_id == CLDMA_ID_MD)
+		md_ctrl->pm_entity->id = PM_ENTITY_ID_CTRL1;
+	else
+		md_ctrl->pm_entity->id = PM_ENTITY_ID_CTRL2;
+
+	md_ctrl->pm_entity->suspend = t7xx_cldma_suspend;
+	md_ctrl->pm_entity->suspend_late = t7xx_cldma_suspend_late;
+	md_ctrl->pm_entity->resume = t7xx_cldma_resume;
+	md_ctrl->pm_entity->resume_early = t7xx_cldma_resume_early;
+
+	return t7xx_pci_pm_entity_register(md_ctrl->t7xx_dev, md_ctrl->pm_entity);
+}
+
+static int t7xx_cldma_pm_uninit(struct cldma_ctrl *md_ctrl)
+{
+	if (!md_ctrl->pm_entity)
+		return -EINVAL;
+
+	t7xx_pci_pm_entity_unregister(md_ctrl->t7xx_dev, md_ctrl->pm_entity);
+	kfree(md_ctrl->pm_entity);
+	md_ctrl->pm_entity = NULL;
+	return 0;
+}
+
 void t7xx_cldma_hif_hw_init(struct cldma_ctrl *md_ctrl)
 {
 	struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
@@ -1126,6 +1240,7 @@ static void t7xx_cldma_destroy_wqs(struct cldma_ctrl *md_ctrl)
  * t7xx_cldma_init() - Initialize CLDMA.
  * @md_ctrl: CLDMA context structure.
  *
+ * Allocate and initialize device power management entity.
  * Initialize HIF TX/RX queue structure.
  * Register CLDMA callback ISR with PCIe driver.
  *
@@ -1136,12 +1251,16 @@ static void t7xx_cldma_destroy_wqs(struct cldma_ctrl *md_ctrl)
 int t7xx_cldma_init(struct cldma_ctrl *md_ctrl)
 {
 	struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
-	int i;
+	int ret, i;
 
 	md_ctrl->txq_active = 0;
 	md_ctrl->rxq_active = 0;
 	md_ctrl->is_late_init = false;
 
+	ret = t7xx_cldma_pm_init(md_ctrl);
+	if (ret)
+		return ret;
+
 	spin_lock_init(&md_ctrl->cldma_lock);
 
 	for (i = 0; i < CLDMA_TXQ_NUM; i++) {
@@ -1176,6 +1295,7 @@ int t7xx_cldma_init(struct cldma_ctrl *md_ctrl)
 
 err_workqueue:
 	t7xx_cldma_destroy_wqs(md_ctrl);
+	t7xx_cldma_pm_uninit(md_ctrl);
 	return -ENOMEM;
 }
 
@@ -1190,4 +1310,5 @@ void t7xx_cldma_exit(struct cldma_ctrl *md_ctrl)
 	t7xx_cldma_stop(md_ctrl);
 	t7xx_cldma_late_release(md_ctrl);
 	t7xx_cldma_destroy_wqs(md_ctrl);
+	t7xx_cldma_pm_uninit(md_ctrl);
 }

drivers/net/wwan/t7xx/t7xx_hif_cldma.h

@@ -98,6 +98,7 @@ struct cldma_ctrl {
 	struct dma_pool *gpd_dmapool;
 	struct cldma_ring tx_ring[CLDMA_TXQ_NUM];
 	struct cldma_ring rx_ring[CLDMA_RXQ_NUM];
+	struct md_pm_entity *pm_entity;
 	struct t7xx_cldma_hw hw_info;
 	bool is_late_init;
 	int (*recv_skb)(struct cldma_queue *queue, struct sk_buff *skb);

drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c

@@ -398,6 +398,90 @@ static int t7xx_dpmaif_stop(struct dpmaif_ctrl *dpmaif_ctrl)
 	return 0;
 }
 
+static int t7xx_dpmaif_suspend(struct t7xx_pci_dev *t7xx_dev, void *param)
+{
+	struct dpmaif_ctrl *dpmaif_ctrl = param;
+
+	t7xx_dpmaif_tx_stop(dpmaif_ctrl);
+	t7xx_dpmaif_hw_stop_all_txq(&dpmaif_ctrl->hw_info);
+	t7xx_dpmaif_hw_stop_all_rxq(&dpmaif_ctrl->hw_info);
+	t7xx_dpmaif_disable_irq(dpmaif_ctrl);
+	t7xx_dpmaif_rx_stop(dpmaif_ctrl);
+	return 0;
+}
+
+static void t7xx_dpmaif_unmask_dlq_intr(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	int qno;
+
+	for (qno = 0; qno < DPMAIF_RXQ_NUM; qno++)
+		t7xx_dpmaif_dlq_unmask_rx_done(&dpmaif_ctrl->hw_info, qno);
+}
+
+static void t7xx_dpmaif_start_txrx_qs(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	struct dpmaif_rx_queue *rxq;
+	struct dpmaif_tx_queue *txq;
+	unsigned int que_cnt;
+
+	for (que_cnt = 0; que_cnt < DPMAIF_TXQ_NUM; que_cnt++) {
+		txq = &dpmaif_ctrl->txq[que_cnt];
+		txq->que_started = true;
+	}
+
+	for (que_cnt = 0; que_cnt < DPMAIF_RXQ_NUM; que_cnt++) {
+		rxq = &dpmaif_ctrl->rxq[que_cnt];
+		rxq->que_started = true;
+	}
+}
+
+static int t7xx_dpmaif_resume(struct t7xx_pci_dev *t7xx_dev, void *param)
+{
+	struct dpmaif_ctrl *dpmaif_ctrl = param;
+
+	if (!dpmaif_ctrl)
+		return 0;
+
+	t7xx_dpmaif_start_txrx_qs(dpmaif_ctrl);
+	t7xx_dpmaif_enable_irq(dpmaif_ctrl);
+	t7xx_dpmaif_unmask_dlq_intr(dpmaif_ctrl);
+	t7xx_dpmaif_start_hw(&dpmaif_ctrl->hw_info);
+	wake_up(&dpmaif_ctrl->tx_wq);
+	return 0;
+}
+
+static int t7xx_dpmaif_pm_entity_init(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	struct md_pm_entity *dpmaif_pm_entity = &dpmaif_ctrl->dpmaif_pm_entity;
+	int ret;
+
+	INIT_LIST_HEAD(&dpmaif_pm_entity->entity);
+	dpmaif_pm_entity->suspend = &t7xx_dpmaif_suspend;
+	dpmaif_pm_entity->suspend_late = NULL;
+	dpmaif_pm_entity->resume_early = NULL;
+	dpmaif_pm_entity->resume = &t7xx_dpmaif_resume;
+	dpmaif_pm_entity->id = PM_ENTITY_ID_DATA;
+	dpmaif_pm_entity->entity_param = dpmaif_ctrl;
+
+	ret = t7xx_pci_pm_entity_register(dpmaif_ctrl->t7xx_dev, dpmaif_pm_entity);
+	if (ret)
+		dev_err(dpmaif_ctrl->dev, "dpmaif register pm_entity fail\n");
+
+	return ret;
+}
+
+static int t7xx_dpmaif_pm_entity_release(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	struct md_pm_entity *dpmaif_pm_entity = &dpmaif_ctrl->dpmaif_pm_entity;
+	int ret;
+
+	ret = t7xx_pci_pm_entity_unregister(dpmaif_ctrl->t7xx_dev, dpmaif_pm_entity);
+	if (ret < 0)
+		dev_err(dpmaif_ctrl->dev, "dpmaif register pm_entity fail\n");
+
+	return ret;
+}
+
 int t7xx_dpmaif_md_state_callback(struct dpmaif_ctrl *dpmaif_ctrl, enum md_state state)
 {
 	int ret = 0;
@@ -461,11 +545,16 @@ struct dpmaif_ctrl *t7xx_dpmaif_hif_init(struct t7xx_pci_dev *t7xx_dev,
 	dpmaif_ctrl->hw_info.pcie_base = t7xx_dev->base_addr.pcie_ext_reg_base -
 					 t7xx_dev->base_addr.pcie_dev_reg_trsl_addr;
 
+	ret = t7xx_dpmaif_pm_entity_init(dpmaif_ctrl);
+	if (ret)
+		return NULL;
+
 	t7xx_dpmaif_register_pcie_irq(dpmaif_ctrl);
 	t7xx_dpmaif_disable_irq(dpmaif_ctrl);
 
 	ret = t7xx_dpmaif_rxtx_sw_allocs(dpmaif_ctrl);
 	if (ret) {
+		t7xx_dpmaif_pm_entity_release(dpmaif_ctrl);
 		dev_err(dev, "Failed to allocate RX/TX SW resources: %d\n", ret);
 		return NULL;
 	}
@@ -478,6 +567,7 @@ void t7xx_dpmaif_hif_exit(struct dpmaif_ctrl *dpmaif_ctrl)
 {
 	if (dpmaif_ctrl->dpmaif_sw_init_done) {
 		t7xx_dpmaif_stop(dpmaif_ctrl);
+		t7xx_dpmaif_pm_entity_release(dpmaif_ctrl);
 		t7xx_dpmaif_sw_release(dpmaif_ctrl);
 		dpmaif_ctrl->dpmaif_sw_init_done = false;
 	}

drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h

@@ -174,6 +174,7 @@ struct dpmaif_callbacks {
 struct dpmaif_ctrl {
 	struct device			*dev;
 	struct t7xx_pci_dev		*t7xx_dev;
+	struct md_pm_entity		dpmaif_pm_entity;
 	enum dpmaif_state		state;
 	bool				dpmaif_sw_init_done;
 	struct dpmaif_hw_info		hw_info;

drivers/net/wwan/t7xx/t7xx_mhccif.c

@@ -24,6 +24,11 @@
 #include "t7xx_pcie_mac.h"
 #include "t7xx_reg.h"
 
+#define D2H_INT_SR_ACK		(D2H_INT_SUSPEND_ACK |		\
+				 D2H_INT_RESUME_ACK |		\
+				 D2H_INT_SUSPEND_ACK_AP |	\
+				 D2H_INT_RESUME_ACK_AP)
+
 static void t7xx_mhccif_clear_interrupts(struct t7xx_pci_dev *t7xx_dev, u32 mask)
 {
 	void __iomem *mhccif_pbase = t7xx_dev->base_addr.mhccif_rc_base;
@@ -53,6 +58,18 @@ static irqreturn_t t7xx_mhccif_isr_thread(int irq, void *data)
 	}
 
 	t7xx_mhccif_clear_interrupts(t7xx_dev, int_status);
+
+	if (int_status & D2H_INT_SR_ACK)
+		complete(&t7xx_dev->pm_sr_ack);
+
+	iowrite32(T7XX_L1_BIT(1), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR);
+
+	int_status = t7xx_mhccif_read_sw_int_sts(t7xx_dev);
+	if (!int_status) {
+		val = T7XX_L1_1_BIT(1) | T7XX_L1_2_BIT(1);
+		iowrite32(val, IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR);
+	}
+
 	t7xx_pcie_mac_set_int(t7xx_dev, MHCCIF_INT);
 	return IRQ_HANDLED;
 }