From 3d2a98cd5e17052f461390c72efe1076c18fd62d Mon Sep 17 00:00:00 2001
From: Eric Miao <eric.miao@marvell.com>
Date: Mon, 13 Apr 2009 15:59:03 +0800
Subject: [ARM] pxa: simplify secondary PWM handling and use platform_device_id
 table

Signed-off-by: Eric Miao <eric.miao@marvell.com>

diff --git a/arch/arm/mach-pxa/pwm.c b/arch/arm/mach-pxa/pwm.c
index fcdd374..dec6f2c 100644
--- a/arch/arm/mach-pxa/pwm.c
+++ b/arch/arm/mach-pxa/pwm.c
@@ -21,6 +21,16 @@
 
 #include <asm/div64.h>
 
+#define HAS_SECONDARY_PWM	0x10
+
+static const struct platform_device_id pwm_id_table[] = {
+	/*   PWM    has_secondary_pwm? */
+	{ "pxa25x-pwm", 0 },
+	{ "pxa27x-pwm", HAS_SECONDARY_PWM },
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, pwm_id_table);
+
 /* PWM registers and bits definitions */
 #define PWMCR		(0x00)
 #define PWMDCR		(0x04)
@@ -31,7 +41,8 @@
 
 struct pwm_device {
 	struct list_head	node;
-	struct platform_device *pdev;
+	struct pwm_device	*secondary;
+	struct platform_device	*pdev;
 
 	const char	*label;
 	struct clk	*clk;
@@ -159,17 +170,17 @@ static inline void __add_pwm(struct pwm_device *pwm)
 	mutex_unlock(&pwm_lock);
 }
 
-static struct pwm_device *pwm_probe(struct platform_device *pdev,
-		unsigned int pwm_id, struct pwm_device *parent_pwm)
+static int __devinit pwm_probe(struct platform_device *pdev)
 {
-	struct pwm_device *pwm;
+	struct platform_device_id *id = platform_get_device_id(pdev);
+	struct pwm_device *pwm, *secondary = NULL;
 	struct resource *r;
 	int ret = 0;
 
 	pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
 	if (pwm == NULL) {
 		dev_err(&pdev->dev, "failed to allocate memory\n");
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	}
 
 	pwm->clk = clk_get(&pdev->dev, NULL);
@@ -180,16 +191,9 @@ static struct pwm_device *pwm_probe(struct platform_device *pdev,
 	pwm->clk_enabled = 0;
 
 	pwm->use_count = 0;
-	pwm->pwm_id = pwm_id;
+	pwm->pwm_id = pdev->id;
 	pwm->pdev = pdev;
 
-	if (parent_pwm != NULL) {
-		/* registers for the second PWM has offset of 0x10 */
-		pwm->mmio_base = parent_pwm->mmio_base + 0x10;
-		__add_pwm(pwm);
-		return pwm;
-	}
-
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (r == NULL) {
 		dev_err(&pdev->dev, "no memory resource defined\n");
@@ -211,9 +215,27 @@ static struct pwm_device *pwm_probe(struct platform_device *pdev,
 		goto err_free_mem;
 	}
 
+	if (id->driver_data & HAS_SECONDARY_PWM) {
+		secondary = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
+		if (secondary == NULL) {
+			ret = -ENOMEM;
+			goto err_free_mem;
+		}
+
+		*secondary = *pwm;
+		pwm->secondary = secondary;
+
+		/* registers for the second PWM has offset of 0x10 */
+		secondary->mmio_base = pwm->mmio_base + 0x10;
+		secondary->pwm_id = pdev->id + 2;
+	}
+
 	__add_pwm(pwm);
+	if (secondary)
+		__add_pwm(secondary);
+
 	platform_set_drvdata(pdev, pwm);
-	return pwm;
+	return 0;
 
 err_free_mem:
 	release_mem_region(r->start, r->end - r->start + 1);
@@ -221,32 +243,7 @@ err_free_clk:
 	clk_put(pwm->clk);
 err_free:
 	kfree(pwm);
-	return ERR_PTR(ret);
-}
-
-static int __devinit pxa25x_pwm_probe(struct platform_device *pdev)
-{
-	struct pwm_device *pwm = pwm_probe(pdev, pdev->id, NULL);
-
-	if (IS_ERR(pwm))
-		return PTR_ERR(pwm);
-
-	return 0;
-}
-
-static int __devinit pxa27x_pwm_probe(struct platform_device *pdev)
-{
-	struct pwm_device *pwm;
-
-	pwm = pwm_probe(pdev, pdev->id, NULL);
-	if (IS_ERR(pwm))
-		return PTR_ERR(pwm);
-
-	pwm = pwm_probe(pdev, pdev->id + 2, pwm);
-	if (IS_ERR(pwm))
-		return PTR_ERR(pwm);
-
-	return 0;
+	return ret;
 }
 
 static int __devexit pwm_remove(struct platform_device *pdev)
@@ -259,6 +256,12 @@ static int __devexit pwm_remove(struct platform_device *pdev)
 		return -ENODEV;
 
 	mutex_lock(&pwm_lock);
+
+	if (pwm->secondary) {
+		list_del(&pwm->secondary->node);
+		kfree(pwm->secondary);
+	}
+
 	list_del(&pwm->node);
 	mutex_unlock(&pwm_lock);
 
@@ -272,46 +275,25 @@ static int __devexit pwm_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct platform_driver pxa25x_pwm_driver = {
+static struct platform_driver pwm_driver = {
 	.driver		= {
 		.name	= "pxa25x-pwm",
+		.owner	= THIS_MODULE,
 	},
-	.probe		= pxa25x_pwm_probe,
-	.remove		= __devexit_p(pwm_remove),
-};
-
-static struct platform_driver pxa27x_pwm_driver = {
-	.driver		= {
-		.name	= "pxa27x-pwm",
-	},
-	.probe		= pxa27x_pwm_probe,
+	.probe		= pwm_probe,
 	.remove		= __devexit_p(pwm_remove),
+	.id_table	= pwm_id_table,
 };
 
 static int __init pwm_init(void)
 {
-	int ret = 0;
-
-	ret = platform_driver_register(&pxa25x_pwm_driver);
-	if (ret) {
-		printk(KERN_ERR "failed to register pxa25x_pwm_driver\n");
-		return ret;
-	}
-
-	ret = platform_driver_register(&pxa27x_pwm_driver);
-	if (ret) {
-		printk(KERN_ERR "failed to register pxa27x_pwm_driver\n");
-		return ret;
-	}
-
-	return ret;
+	return platform_driver_register(&pwm_driver);
 }
 arch_initcall(pwm_init);
 
 static void __exit pwm_exit(void)
 {
-	platform_driver_unregister(&pxa25x_pwm_driver);
-	platform_driver_unregister(&pxa27x_pwm_driver);
+	platform_driver_unregister(&pwm_driver);
 }
 module_exit(pwm_exit);
 
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