[PATCH 09/11] usb: dwc3: dwc3-octeon: Convert to glue driver

[Ladislav Michl <oss-lists@triops.cz>]

From: Ladislav Michl <ladis@linux-mips.org>

Use Octeon specific DWC3 glue instead of dwc3-of-simple.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
---
 arch/mips/cavium-octeon/octeon-platform.c |   1 -
 drivers/usb/dwc3/dwc3-octeon.c            | 100 +++++++++++-----------
 drivers/usb/dwc3/dwc3-of-simple.c         |   1 -
 3 files changed, 52 insertions(+), 50 deletions(-)

diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c
index ce05c0dd3acd..235c77ce7b18 100644
--- a/arch/mips/cavium-octeon/octeon-platform.c
+++ b/arch/mips/cavium-octeon/octeon-platform.c
@@ -450,7 +450,6 @@ static const struct of_device_id octeon_ids[] __initconst = {
 	{ .compatible = "cavium,octeon-3860-bootbus", },
 	{ .compatible = "cavium,mdio-mux", },
 	{ .compatible = "gpio-leds", },
-	{ .compatible = "cavium,octeon-7130-usb-uctl", },
 	{},
 };
 
diff --git a/drivers/usb/dwc3/dwc3-octeon.c b/drivers/usb/dwc3/dwc3-octeon.c
index 2add435ad038..3ebcf2a61233 100644
--- a/drivers/usb/dwc3/dwc3-octeon.c
+++ b/drivers/usb/dwc3/dwc3-octeon.c
@@ -187,7 +187,10 @@
 #define USBDRD_UCTL_ECC				0xf0
 #define USBDRD_UCTL_SPARE1			0xf8
 
-static DEFINE_MUTEX(dwc3_octeon_clocks_mutex);
+struct dwc3_data {
+	struct device *dev;
+	void __iomem *base;
+};
 
 #ifdef CONFIG_CAVIUM_OCTEON_SOC
 #include <asm/octeon/octeon.h>
@@ -494,58 +499,57 @@ static void __init dwc3_octeon_phy_reset(void __iomem *base)
 	dwc3_octeon_writeq(uctl_ctl_reg, val);
 }
 
-static int __init dwc3_octeon_device_init(void)
+static int dwc3_octeon_probe(struct platform_device *pdev)
 {
-	const char compat_node_name[] = "cavium,octeon-7130-usb-uctl";
-	struct platform_device *pdev;
-	struct device_node *node;
-	struct resource *res;
-	void __iomem *base;
+	struct device *dev = &pdev->dev;
+	struct dwc3_data *data;
+	int err;
 
-	/*
-	 * There should only be three universal controllers, "uctl"
-	 * in the device tree. Two USB and a SATA, which we ignore.
-	 */
-	node = NULL;
-	do {
-		node = of_find_node_by_name(node, "uctl");
-		if (!node)
-			return -ENODEV;
-
-		if (of_device_is_compatible(node, compat_node_name)) {
-			pdev = of_find_device_by_node(node);
-			if (!pdev)
-				return -ENODEV;
-
-			/*
-			 * The code below maps in the registers necessary for
-			 * setting up the clocks and reseting PHYs. We must
-			 * release the resources so the dwc3 subsystem doesn't
-			 * know the difference.
-			 */
-			base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-			if (IS_ERR(base)) {
-				put_device(&pdev->dev);
-				return PTR_ERR(base);
-			}
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
 
-			mutex_lock(&dwc3_octeon_clocks_mutex);
-			if (dwc3_octeon_clocks_start(&pdev->dev, base) == 0)
-				dev_info(&pdev->dev, "clocks initialized.\n");
-			dwc3_octeon_set_endian_mode(base);
-			dwc3_octeon_phy_reset(base);
-			mutex_unlock(&dwc3_octeon_clocks_mutex);
-			devm_iounmap(&pdev->dev, base);
-			devm_release_mem_region(&pdev->dev, res->start,
-						resource_size(res));
-			put_device(&pdev->dev);
-		}
-	} while (node != NULL);
+	data->dev = dev;
+	platform_set_drvdata(pdev, data);
 
-	return 0;
+	data->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(data->base))
+		return PTR_ERR(data->base);
+
+	err = dwc3_octeon_clocks_start(dev, data->base);
+	if (err)
+		return err;
+
+	dwc3_octeon_set_endian_mode(data->base);
+	dwc3_octeon_phy_reset(data->base);
+
+	return of_platform_populate(node, NULL, NULL, dev);
+}
+
+static void dwc3_octeon_remove(struct platform_device *pdev)
+{
+	struct dwc3_data *data = platform_get_drvdata(pdev);
+
+	of_platform_depopulate(data->dev);
 }
-device_initcall(dwc3_octeon_device_init);
 
+static const struct of_device_id dwc3_octeon_of_match[] = {
+	{ .compatible = "cavium,octeon-7130-usb-uctl" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, dwc3_octeon_of_match);
+
+static struct platform_driver dwc3_octeon_driver = {
+	.probe		= dwc3_octeon_probe,
+	.remove_new	= dwc3_octeon_remove,
+	.driver		= {
+		.name	= "dwc3-octeon",
+		.of_match_table = dwc3_octeon_of_match,
+	},
+};
+module_platform_driver(dwc3_octeon_driver);
+
+MODULE_ALIAS("platform:dwc3-octeon");
 MODULE_AUTHOR("David Daney <david.daney@cavium.com>");
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("USB driver for OCTEON III SoC");
+MODULE_DESCRIPTION("DesignWare USB3 OCTEON III Glue Layer");
diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index 71fd620c5161..e3423fbea3ed 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -172,7 +172,6 @@ static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 
 static const struct of_device_id of_dwc3_simple_match[] = {
 	{ .compatible = "rockchip,rk3399-dwc3" },
-	{ .compatible = "cavium,octeon-7130-usb-uctl" },
 	{ .compatible = "sprd,sc9860-dwc3" },
 	{ .compatible = "allwinner,sun50i-h6-dwc3" },
 	{ .compatible = "hisilicon,hi3670-dwc3" },
-- 
2.39.2