btmrvl: add platform specific wakeup interrupt support

On some arm-based platforms, we need to configure platform specific
parameters by device tree node and also define our node as a child
node of parent SDIO host controller.
This patch parses these parameters from device tree. It includes
calibration data download to firmware, wakeup pin configured to firmware,
and soc specific wake up gpio, which will be set as wakeup interrupt pin.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 79 insertions, 0 deletions

diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c
index c6ef248de5e4..f425ddf91a24 100644
--- a/drivers/bluetooth/btmrvl_sdio.c
+++ b/drivers/bluetooth/btmrvl_sdio.c
@@ -52,6 +52,68 @@ static struct memory_type_mapping mem_type_mapping_tbl[] = {
 	{"EXTLAST", NULL, 0, 0xFE},
 };
 
+static const struct of_device_id btmrvl_sdio_of_match_table[] = {
+	{ .compatible = "marvell,sd8897-bt" },
+	{ .compatible = "marvell,sd8997-bt" },
+	{ }
+};
+
+static irqreturn_t btmrvl_wake_irq_bt(int irq, void *priv)
+{
+	struct btmrvl_plt_wake_cfg *cfg = priv;
+
+	if (cfg->irq_bt >= 0) {
+		pr_info("%s: wake by bt", __func__);
+		cfg->wake_by_bt = true;
+		disable_irq_nosync(irq);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* This function parses device tree node using mmc subnode devicetree API.
+ * The device node is saved in card->plt_of_node.
+ * If the device tree node exists and includes interrupts attributes, this
+ * function will request platform specific wakeup interrupt.
+ */
+static int btmrvl_sdio_probe_of(struct device *dev,
+				struct btmrvl_sdio_card *card)
+{
+	struct btmrvl_plt_wake_cfg *cfg;
+	int ret;
+
+	if (!dev->of_node ||
+	    !of_match_node(btmrvl_sdio_of_match_table, dev->of_node)) {
+		pr_err("sdio platform data not available");
+		return -1;
+	}
+
+	card->plt_of_node = dev->of_node;
+
+	card->plt_wake_cfg = devm_kzalloc(dev, sizeof(*card->plt_wake_cfg),
+					  GFP_KERNEL);
+	cfg = card->plt_wake_cfg;
+	if (cfg && card->plt_of_node) {
+		cfg->irq_bt = irq_of_parse_and_map(card->plt_of_node, 0);
+		if (!cfg->irq_bt) {
+			dev_err(dev, "fail to parse irq_bt from device tree");
+		} else {
+			ret = devm_request_irq(dev, cfg->irq_bt,
+					       btmrvl_wake_irq_bt,
+					       IRQF_TRIGGER_LOW,
+					       "bt_wake", cfg);
+			if (ret) {
+				dev_err(dev,
+					"Failed to request irq_bt %d (%d)\n",
+					cfg->irq_bt, ret);
+			}
+			disable_irq(cfg->irq_bt);
+		}
+	}
+
+	return 0;
+}
+
 /* The btmrvl_sdio_remove() callback function is called
  * when user removes this module from kernel space or ejects
  * the card from the slot. The driver handles these 2 cases
@@ -1464,6 +1526,9 @@ static int btmrvl_sdio_probe(struct sdio_func *func,
 
 	btmrvl_sdio_enable_host_int(card);
 
+	/* Device tree node parsing and platform specific configuration*/
+	btmrvl_sdio_probe_of(&func->dev, card);
+
 	priv = btmrvl_add_card(card);
 	if (!priv) {
 		BT_ERR("Initializing card failed!");
@@ -1544,6 +1609,13 @@ static int btmrvl_sdio_suspend(struct device *dev)
 		return 0;
 	}
 
+	/* Enable platform specific wakeup interrupt */
+	if (card->plt_wake_cfg && card->plt_wake_cfg->irq_bt >= 0) {
+		card->plt_wake_cfg->wake_by_bt = false;
+		enable_irq(card->plt_wake_cfg->irq_bt);
+		enable_irq_wake(card->plt_wake_cfg->irq_bt);
+	}
+
 	priv = card->priv;
 	priv->adapter->is_suspending = true;
 	hcidev = priv->btmrvl_dev.hcidev;
@@ -1606,6 +1678,13 @@ static int btmrvl_sdio_resume(struct device *dev)
 	BT_DBG("%s: SDIO resume", hcidev->name);
 	hci_resume_dev(hcidev);
 
+	/* Disable platform specific wakeup interrupt */
+	if (card->plt_wake_cfg && card->plt_wake_cfg->irq_bt >= 0) {
+		disable_irq_wake(card->plt_wake_cfg->irq_bt);
+		if (!card->plt_wake_cfg->wake_by_bt)
+			disable_irq(card->plt_wake_cfg->irq_bt);
+	}
+
 	return 0;
 }