USB: add platform glue driver for FSL USB DR controller

Replace FSL USB platform code by simple platform driver for
creation of FSL USB platform devices.

The driver creates platform devices based on the information
from USB nodes in the flat device tree. This is the replacement
for old arch fsl_soc usb code removed by this patch. The driver
uses usual of-style binding, available EHCI-HCD and UDC
drivers can be bound to the created devices. The new of-style
driver additionaly instantiates USB OTG platform device, as the
appropriate USB OTG driver will be added soon.

Signed-off-by: Anatolij Gustschin <[e-mail]>
Cc: Kumar Gala <[e-mail]>
Cc: Grant Likely <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

arch/powerpc/sysdev/fsl_soc.c

···
 arch_initcall(of_add_fixed_phys);
 #endif /* CONFIG_FIXED_PHY */
 
-static enum fsl_usb2_phy_modes determine_usb_phy(const char *phy_type)
-{
-	if (!phy_type)
-		return FSL_USB2_PHY_NONE;
-	if (!strcasecmp(phy_type, "ulpi"))
-		return FSL_USB2_PHY_ULPI;
-	if (!strcasecmp(phy_type, "utmi"))
-		return FSL_USB2_PHY_UTMI;
-	if (!strcasecmp(phy_type, "utmi_wide"))
-		return FSL_USB2_PHY_UTMI_WIDE;
-	if (!strcasecmp(phy_type, "serial"))
-		return FSL_USB2_PHY_SERIAL;
-
-	return FSL_USB2_PHY_NONE;
-}
-
-static int __init fsl_usb_of_init(void)
-{
-	struct device_node *np;
-	unsigned int i = 0;
-	struct platform_device *usb_dev_mph = NULL, *usb_dev_dr_host = NULL,
-		*usb_dev_dr_client = NULL;
-	int ret;
-
-	for_each_compatible_node(np, NULL, "fsl-usb2-mph") {
-		struct resource r[2];
-		struct fsl_usb2_platform_data usb_data;
-		const unsigned char *prop = NULL;
-
-		memset(&r, 0, sizeof(r));
-		memset(&usb_data, 0, sizeof(usb_data));
-
-		ret = of_address_to_resource(np, 0, &r[0]);
-		if (ret)
-			goto err;
-
-		of_irq_to_resource(np, 0, &r[1]);
-
-		usb_dev_mph =
-		    platform_device_register_simple("fsl-ehci", i, r, 2);
-		if (IS_ERR(usb_dev_mph)) {
-			ret = PTR_ERR(usb_dev_mph);
-			goto err;
-		}
-
-		usb_dev_mph->dev.coherent_dma_mask = 0xffffffffUL;
-		usb_dev_mph->dev.dma_mask = &usb_dev_mph->dev.coherent_dma_mask;
-
-		usb_data.operating_mode = FSL_USB2_MPH_HOST;
-
-		prop = of_get_property(np, "port0", NULL);
-		if (prop)
-			usb_data.port_enables |= FSL_USB2_PORT0_ENABLED;
-
-		prop = of_get_property(np, "port1", NULL);
-		if (prop)
-			usb_data.port_enables |= FSL_USB2_PORT1_ENABLED;
-
-		prop = of_get_property(np, "phy_type", NULL);
-		usb_data.phy_mode = determine_usb_phy(prop);
-
-		ret =
-		    platform_device_add_data(usb_dev_mph, &usb_data,
-					     sizeof(struct
-						    fsl_usb2_platform_data));
-		if (ret)
-			goto unreg_mph;
-		i++;
-	}
-
-	for_each_compatible_node(np, NULL, "fsl-usb2-dr") {
-		struct resource r[2];
-		struct fsl_usb2_platform_data usb_data;
-		const unsigned char *prop = NULL;
-
-		if (!of_device_is_available(np))
-			continue;
-
-		memset(&r, 0, sizeof(r));
-		memset(&usb_data, 0, sizeof(usb_data));
-
-		ret = of_address_to_resource(np, 0, &r[0]);
-		if (ret)
-			goto unreg_mph;
-
-		of_irq_to_resource(np, 0, &r[1]);
-
-		prop = of_get_property(np, "dr_mode", NULL);
-
-		if (!prop || !strcmp(prop, "host")) {
-			usb_data.operating_mode = FSL_USB2_DR_HOST;
-			usb_dev_dr_host = platform_device_register_simple(
-					"fsl-ehci", i, r, 2);
-			if (IS_ERR(usb_dev_dr_host)) {
-				ret = PTR_ERR(usb_dev_dr_host);
-				goto err;
-			}
-		} else if (prop && !strcmp(prop, "peripheral")) {
-			usb_data.operating_mode = FSL_USB2_DR_DEVICE;
-			usb_dev_dr_client = platform_device_register_simple(
-					"fsl-usb2-udc", i, r, 2);
-			if (IS_ERR(usb_dev_dr_client)) {
-				ret = PTR_ERR(usb_dev_dr_client);
-				goto err;
-			}
-		} else if (prop && !strcmp(prop, "otg")) {
-			usb_data.operating_mode = FSL_USB2_DR_OTG;
-			usb_dev_dr_host = platform_device_register_simple(
-					"fsl-ehci", i, r, 2);
-			if (IS_ERR(usb_dev_dr_host)) {
-				ret = PTR_ERR(usb_dev_dr_host);
-				goto err;
-			}
-			usb_dev_dr_client = platform_device_register_simple(
-					"fsl-usb2-udc", i, r, 2);
-			if (IS_ERR(usb_dev_dr_client)) {
-				ret = PTR_ERR(usb_dev_dr_client);
-				goto err;
-			}
-		} else {
-			ret = -EINVAL;
-			goto err;
-		}
-
-		prop = of_get_property(np, "phy_type", NULL);
-		usb_data.phy_mode = determine_usb_phy(prop);
-
-		if (usb_dev_dr_host) {
-			usb_dev_dr_host->dev.coherent_dma_mask = 0xffffffffUL;
-			usb_dev_dr_host->dev.dma_mask = &usb_dev_dr_host->
-				dev.coherent_dma_mask;
-			if ((ret = platform_device_add_data(usb_dev_dr_host,
-						&usb_data, sizeof(struct
-						fsl_usb2_platform_data))))
-				goto unreg_dr;
-		}
-		if (usb_dev_dr_client) {
-			usb_dev_dr_client->dev.coherent_dma_mask = 0xffffffffUL;
-			usb_dev_dr_client->dev.dma_mask = &usb_dev_dr_client->
-				dev.coherent_dma_mask;
-			if ((ret = platform_device_add_data(usb_dev_dr_client,
-						&usb_data, sizeof(struct
-						fsl_usb2_platform_data))))
-				goto unreg_dr;
-		}
-		i++;
-	}
-	return 0;
-
-unreg_dr:
-	if (usb_dev_dr_host)
-		platform_device_unregister(usb_dev_dr_host);
-	if (usb_dev_dr_client)
-		platform_device_unregister(usb_dev_dr_client);
-unreg_mph:
-	if (usb_dev_mph)
-		platform_device_unregister(usb_dev_mph);
-err:
-	return ret;
-}
-
-arch_initcall(fsl_usb_of_init);
-
 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
 static __be32 __iomem *rstcr;
 

drivers/usb/gadget/Kconfig

···
 	boolean "Freescale Highspeed USB DR Peripheral Controller"
 	depends on FSL_SOC || ARCH_MXC
 	select USB_GADGET_DUALSPEED
+	select USB_FSL_MPH_DR_OF
 	help
 	   Some of Freescale PowerPC processors have a High Speed
 	   Dual-Role(DR) USB controller, which supports device mode.

drivers/usb/host/Kconfig

···
 		support both high speed and full speed devices, or high speed
 		devices only.
 
+config USB_FSL_MPH_DR_OF
+	tristate
+
 config USB_EHCI_FSL
 	bool "Support for Freescale on-chip EHCI USB controller"
 	depends on USB_EHCI_HCD && FSL_SOC
 	select USB_EHCI_ROOT_HUB_TT
+	select USB_FSL_MPH_DR_OF
 	---help---
 	  Variation of ARC USB block used in some Freescale chips.
 

drivers/usb/host/Makefile

···
 obj-$(CONFIG_USB_ISP1760_HCD)	+= isp1760.o
 obj-$(CONFIG_USB_HWA_HCD)	+= hwa-hc.o
 obj-$(CONFIG_USB_IMX21_HCD)	+= imx21-hcd.o
+obj-$(CONFIG_USB_FSL_MPH_DR_OF)	+= fsl-mph-dr-of.o
 

drivers/usb/host/fsl-mph-dr-of.c

···
+/*
+ * Setup platform devices needed by the Freescale multi-port host
+ * and/or dual-role USB controller modules based on the description
+ * in flat device tree.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/fsl_devices.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+
+struct fsl_usb2_dev_data {
+	char *dr_mode;		/* controller mode */
+	char *drivers[3];	/* drivers to instantiate for this mode */
+	enum fsl_usb2_operating_modes op_mode;	/* operating mode */
+};
+
+struct fsl_usb2_dev_data dr_mode_data[] __devinitdata = {
+	{
+		.dr_mode = "host",
+		.drivers = { "fsl-ehci", NULL, NULL, },
+		.op_mode = FSL_USB2_DR_HOST,
+	},
+	{
+		.dr_mode = "otg",
+		.drivers = { "fsl-usb2-otg", "fsl-ehci", "fsl-usb2-udc", },
+		.op_mode = FSL_USB2_DR_OTG,
+	},
+	{
+		.dr_mode = "peripheral",
+		.drivers = { "fsl-usb2-udc", NULL, NULL, },
+		.op_mode = FSL_USB2_DR_DEVICE,
+	},
+};
+
+struct fsl_usb2_dev_data * __devinit get_dr_mode_data(struct device_node *np)
+{
+	const unsigned char *prop;
+	int i;
+
+	prop = of_get_property(np, "dr_mode", NULL);
+	if (prop) {
+		for (i = 0; i < ARRAY_SIZE(dr_mode_data); i++) {
+			if (!strcmp(prop, dr_mode_data[i].dr_mode))
+				return &dr_mode_data[i];
+		}
+	}
+	pr_warn("%s: Invalid 'dr_mode' property, fallback to host mode\n",
+		np->full_name);
+	return &dr_mode_data[0]; /* mode not specified, use host */
+}
+
+static enum fsl_usb2_phy_modes __devinit determine_usb_phy(const char *phy_type)
+{
+	if (!phy_type)
+		return FSL_USB2_PHY_NONE;
+	if (!strcasecmp(phy_type, "ulpi"))
+		return FSL_USB2_PHY_ULPI;
+	if (!strcasecmp(phy_type, "utmi"))
+		return FSL_USB2_PHY_UTMI;
+	if (!strcasecmp(phy_type, "utmi_wide"))
+		return FSL_USB2_PHY_UTMI_WIDE;
+	if (!strcasecmp(phy_type, "serial"))
+		return FSL_USB2_PHY_SERIAL;
+
+	return FSL_USB2_PHY_NONE;
+}
+
+struct platform_device * __devinit fsl_usb2_device_register(
+					struct platform_device *ofdev,
+					struct fsl_usb2_platform_data *pdata,
+					const char *name, int id)
+{
+	struct platform_device *pdev;
+	const struct resource *res = ofdev->resource;
+	unsigned int num = ofdev->num_resources;
+	int retval;
+
+	pdev = platform_device_alloc(name, id);
+	if (!pdev) {
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	pdev->dev.parent = &ofdev->dev;
+
+	pdev->dev.coherent_dma_mask = ofdev->dev.coherent_dma_mask;
+	pdev->dev.dma_mask = &pdev->archdata.dma_mask;
+	*pdev->dev.dma_mask = *ofdev->dev.dma_mask;
+
+	retval = platform_device_add_data(pdev, pdata, sizeof(*pdata));
+	if (retval)
+		goto error;
+
+	if (num) {
+		retval = platform_device_add_resources(pdev, res, num);
+		if (retval)
+			goto error;
+	}
+
+	retval = platform_device_add(pdev);
+	if (retval)
+		goto error;
+
+	return pdev;
+
+error:
+	platform_device_put(pdev);
+	return ERR_PTR(retval);
+}
+
+static const struct of_device_id fsl_usb2_mph_dr_of_match[];
+
+static int __devinit fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct platform_device *usb_dev;
+	struct fsl_usb2_platform_data data, *pdata;
+	struct fsl_usb2_dev_data *dev_data;
+	const struct of_device_id *match;
+	const unsigned char *prop;
+	static unsigned int idx;
+	int i;
+
+	if (!of_device_is_available(np))
+		return -ENODEV;
+
+	match = of_match_device(fsl_usb2_mph_dr_of_match, &ofdev->dev);
+	if (!match)
+		return -ENODEV;
+
+	pdata = &data;
+	if (match->data)
+		memcpy(pdata, match->data, sizeof(data));
+	else
+		memset(pdata, 0, sizeof(data));
+
+	dev_data = get_dr_mode_data(np);
+
+	if (of_device_is_compatible(np, "fsl-usb2-mph")) {
+		if (of_get_property(np, "port0", NULL))
+			pdata->port_enables |= FSL_USB2_PORT0_ENABLED;
+
+		if (of_get_property(np, "port1", NULL))
+			pdata->port_enables |= FSL_USB2_PORT1_ENABLED;
+
+		pdata->operating_mode = FSL_USB2_MPH_HOST;
+	} else {
+		/* setup mode selected in the device tree */
+		pdata->operating_mode = dev_data->op_mode;
+	}
+
+	prop = of_get_property(np, "phy_type", NULL);
+	pdata->phy_mode = determine_usb_phy(prop);
+
+	for (i = 0; i < ARRAY_SIZE(dev_data->drivers); i++) {
+		if (!dev_data->drivers[i])
+			continue;
+		usb_dev = fsl_usb2_device_register(ofdev, pdata,
+					dev_data->drivers[i], idx);
+		if (IS_ERR(usb_dev)) {
+			dev_err(&ofdev->dev, "Can't register usb device\n");
+			return PTR_ERR(usb_dev);
+		}
+	}
+	idx++;
+	return 0;
+}
+
+static int __devexit __unregister_subdev(struct device *dev, void *d)
+{
+	platform_device_unregister(to_platform_device(dev));
+	return 0;
+}
+
+static int __devexit fsl_usb2_mph_dr_of_remove(struct platform_device *ofdev)
+{
+	device_for_each_child(&ofdev->dev, NULL, __unregister_subdev);
+	return 0;
+}
+
+static const struct of_device_id fsl_usb2_mph_dr_of_match[] = {
+	{ .compatible = "fsl-usb2-mph", },
+	{ .compatible = "fsl-usb2-dr", },
+	{},
+};
+
+static struct platform_driver fsl_usb2_mph_dr_driver = {
+	.driver = {
+		.name = "fsl-usb2-mph-dr",
+		.owner = THIS_MODULE,
+		.of_match_table = fsl_usb2_mph_dr_of_match,
+	},
+	.probe	= fsl_usb2_mph_dr_of_probe,
+	.remove	= __devexit_p(fsl_usb2_mph_dr_of_remove),
+};
+
+static int __init fsl_usb2_mph_dr_init(void)
+{
+	return platform_driver_register(&fsl_usb2_mph_dr_driver);
+}
+module_init(fsl_usb2_mph_dr_init);
+
+static void __exit fsl_usb2_mph_dr_exit(void)
+{
+	platform_driver_unregister(&fsl_usb2_mph_dr_driver);
+}
+module_exit(fsl_usb2_mph_dr_exit);
+
+MODULE_DESCRIPTION("FSL MPH DR OF devices driver");
+MODULE_AUTHOR("Anatolij Gustschin <[e-mail]>");
+MODULE_LICENSE("GPL");