net: ipa: introduce ipa_interrupt_init()

Create a new function ipa_interrupt_init() that is called at probe
time to allocate and initialize the IPA interrupt data structure.
Create ipa_interrupt_exit() as its inverse.

This follows the normal IPA driver pattern of *_init() functions
doing things that can be done before access to hardware is required.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_interrupt.c

@@ -19,6 +19,7 @@
  * time only these three are supported.
  */
 
+#include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/pm_runtime.h>
@@ -238,26 +239,15 @@ void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt)
 /* Configure the IPA interrupt framework */
 int ipa_interrupt_config(struct ipa *ipa)
 {
+	struct ipa_interrupt *interrupt = ipa->interrupt;
 	struct device *dev = &ipa->pdev->dev;
-	struct ipa_interrupt *interrupt;
+	unsigned int irq = interrupt->irq;
 	const struct reg *reg;
-	unsigned int irq;
 	int ret;
 
-	ret = platform_get_irq_byname(ipa->pdev, "ipa");
-	if (ret <= 0) {
-		dev_err(dev, "DT error %d getting \"ipa\" IRQ property\n", ret);
-		return ret ? : -EINVAL;
-	}
-	irq = ret;
-
-	interrupt = kzalloc(sizeof(*interrupt), GFP_KERNEL);
-	if (!interrupt)
-		return -ENOMEM;
 	interrupt->ipa = ipa;
-	interrupt->irq = irq;
 
-	/* Start with all IPA interrupts disabled */
+	/* Disable all IPA interrupt types */
 	reg = ipa_reg(ipa, IPA_IRQ_EN);
 	iowrite32(0, ipa->reg_virt + reg_offset(reg));
 
@@ -297,5 +287,32 @@ void ipa_interrupt_deconfig(struct ipa *ipa)
 
 	dev_pm_clear_wake_irq(dev);
 	free_irq(interrupt->irq, interrupt);
+}
+
+/* Initialize the IPA interrupt structure */
+struct ipa_interrupt *ipa_interrupt_init(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ipa_interrupt *interrupt;
+	int irq;
+
+	irq = platform_get_irq_byname(pdev, "ipa");
+	if (irq <= 0) {
+		dev_err(dev, "DT error %d getting \"ipa\" IRQ property\n", irq);
+
+		return ERR_PTR(irq ? : -EINVAL);
+	}
+
+	interrupt = kzalloc(sizeof(*interrupt), GFP_KERNEL);
+	if (!interrupt)
+		return ERR_PTR(-ENOMEM);
+	interrupt->irq = irq;
+
+	return interrupt;
+}
+
+/* Inverse of ipa_interrupt_init() */
+void ipa_interrupt_exit(struct ipa_interrupt *interrupt)
+{
 	kfree(interrupt);
 }

drivers/net/ipa/ipa_interrupt.h

@@ -89,4 +89,18 @@ int ipa_interrupt_config(struct ipa *ipa);
  */
 void ipa_interrupt_deconfig(struct ipa *ipa);
 
+/**
+ * ipa_interrupt_init() - Initialize the IPA interrupt structure
+ * @pdev:	IPA platform device pointer
+ *
+ * Return:	Pointer to an IPA interrupt structure, or a pointer-coded error
+ */
+struct ipa_interrupt *ipa_interrupt_init(struct platform_device *pdev);
+
+/**
+ * ipa_interrupt_exit() - Inverse of ipa_interrupt_init()
+ * @interrupt:	IPA interrupt structure
+ */
+void ipa_interrupt_exit(struct ipa_interrupt *interrupt);
+
 #endif /* _IPA_INTERRUPT_H_ */

drivers/net/ipa/ipa_main.c

@@ -803,6 +803,7 @@ static enum ipa_firmware_loader ipa_firmware_loader(struct device *dev)
 static int ipa_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct ipa_interrupt *interrupt;
 	enum ipa_firmware_loader loader;
 	const struct ipa_data *data;
 	struct ipa_power *power;
@@ -834,12 +835,21 @@ static int ipa_probe(struct platform_device *pdev)
 	if (loader == IPA_LOADER_DEFER)
 		return -EPROBE_DEFER;
 
-	/* The clock and interconnects might not be ready when we're
-	 * probed, so might return -EPROBE_DEFER.
+	/* The IPA interrupt might not be ready when we're probed, so this
+	 * might return -EPROBE_DEFER.
+	 */
+	interrupt = ipa_interrupt_init(pdev);
+	if (IS_ERR(interrupt))
+		return PTR_ERR(interrupt);
+
+	/* The clock and interconnects might not be ready when we're probed,
+	 * so this might return -EPROBE_DEFER.
 	 */
 	power = ipa_power_init(dev, data->power_data);
-	if (IS_ERR(power))
-		return PTR_ERR(power);
+	if (IS_ERR(power)) {
+		ret = PTR_ERR(power);
+		goto err_interrupt_exit;
+	}
 
 	/* No more EPROBE_DEFER.  Allocate and initialize the IPA structure */
 	ipa = kzalloc(sizeof(*ipa), GFP_KERNEL);
@@ -850,6 +860,7 @@ static int ipa_probe(struct platform_device *pdev)
 
 	ipa->pdev = pdev;
 	dev_set_drvdata(dev, ipa);
+	ipa->interrupt = interrupt;
 	ipa->power = power;
 	ipa->version = data->version;
 	ipa->modem_route_count = data->modem_route_count;
@@ -934,6 +945,8 @@ static int ipa_probe(struct platform_device *pdev)
 	kfree(ipa);
 err_power_exit:
 	ipa_power_exit(power);
+err_interrupt_exit:
+	ipa_interrupt_exit(interrupt);
 
 	return ret;
 }
@@ -941,10 +954,14 @@ static int ipa_probe(struct platform_device *pdev)
 static void ipa_remove(struct platform_device *pdev)
 {
 	struct ipa *ipa = dev_get_drvdata(&pdev->dev);
-	struct ipa_power *power = ipa->power;
 	struct device *dev = &pdev->dev;
+	struct ipa_interrupt *interrupt;
+	struct ipa_power *power;
 	int ret;
 
+	power = ipa->power;
+	interrupt = ipa->interrupt;
+
 	/* Prevent the modem from triggering a call to ipa_setup().  This
 	 * also ensures a modem-initiated setup that's underway completes.
 	 */
@@ -986,6 +1003,7 @@ static void ipa_remove(struct platform_device *pdev)
 	ipa_reg_exit(ipa);
 	kfree(ipa);
 	ipa_power_exit(power);
+	ipa_interrupt_exit(interrupt);
 
 	dev_info(dev, "IPA driver removed");
 }