USB: gadget: atmel_usba: add DT support

Allow to compile the driver all the time if AT91 enabled.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[e-mail]>
Acked-by: Felipe Balbi <[e-mail]>
Acked-by: Nicolas Ferre <[e-mail]>
Tested-by: Bo Shen <[e-mail]>

Documentation/devicetree/bindings/usb/atmel-usb.txt

···
 	interrupts = <10 4>;
 	atmel,vbus-gpio = <&pioC 5 0>;
 };
+
+Atmel High-Speed USB device controller
+
+Required properties:
+ - compatible: Should be "atmel,at91sam9rl-udc"
+ - reg: Address and length of the register set for the device
+ - interrupts: Should contain usba interrupt
+ - ep childnode: To specify the number of endpoints and their properties.
+
+Optional properties:
+ - atmel,vbus-gpio: If present, specifies a gpio that needs to be
+   activated for the bus to be powered.
+
+Required child node properties:
+ - name: Name of the endpoint.
+ - reg: Num of the endpoint.
+ - atmel,fifo-size: Size of the fifo.
+ - atmel,nb-banks: Number of banks.
+ - atmel,can-dma: Boolean to specify if the endpoint support DMA.
+ - atmel,can-isoc: Boolean to specify if the endpoint support ISOC.
+
+usb2: gadget@fff78000 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "atmel,at91sam9rl-udc";
+	reg = <0x00600000 0x80000
+	       0xfff78000 0x400>;
+	interrupts = <27 4 0>;
+	atmel,vbus-gpio = <&pioB 19 0>;
+
+	ep0 {
+		reg = <0>;
+		atmel,fifo-size = <64>;
+		atmel,nb-banks = <1>;
+	};
+
+	ep1 {
+		reg = <1>;
+		atmel,fifo-size = <1024>;
+		atmel,nb-banks = <2>;
+		atmel,can-dma;
+		atmel,can-isoc;
+	};
+
+	ep2 {
+		reg = <2>;
+		atmel,fifo-size = <1024>;
+		atmel,nb-banks = <2>;
+		atmel,can-dma;
+		atmel,can-isoc;
+	};
+
+	ep3 {
+		reg = <3>;
+		atmel,fifo-size = <1024>;
+		atmel,nb-banks = <3>;
+		atmel,can-dma;
+	};
+
+	ep4 {
+		reg = <4>;
+		atmel,fifo-size = <1024>;
+		atmel,nb-banks = <3>;
+		atmel,can-dma;
+	};
+
+	ep5 {
+		reg = <5>;
+		atmel,fifo-size = <1024>;
+		atmel,nb-banks = <3>;
+		atmel,can-dma;
+		atmel,can-isoc;
+	};
+
+	ep6 {
+		reg = <6>;
+		atmel,fifo-size = <1024>;
+		atmel,nb-banks = <3>;
+		atmel,can-dma;
+		atmel,can-isoc;
+	};
+};

drivers/usb/gadget/Kconfig

···
 
 config USB_ATMEL_USBA
 	tristate "Atmel USBA"
-	depends on AVR32 || ARCH_AT91SAM9RL || ARCH_AT91SAM9G45
+	depends on AVR32 || ARCH_AT91
 	help
 	  USBA is the integrated high-speed USB Device controller on
 	  the AT32AP700x, some AT91SAM9 and AT91CAP9 processors from Atmel.

drivers/usb/gadget/atmel_usba_udc.c

···
 #include <linux/usb/atmel_usba_udc.h>
 #include <linux/delay.h>
 #include <linux/platform_data/atmel.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 #include <asm/gpio.h>
 
···
 	return 0;
 }
 
-static int __init usba_udc_probe(struct platform_device *pdev)
+#ifdef CONFIG_OF
+static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
+						    struct usba_udc *udc)
+{
+	u32 val;
+	const char *name;
+	enum of_gpio_flags flags;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *pp;
+	int i, ret;
+	struct usba_ep *eps, *ep;
+
+	udc->num_ep = 0;
+
+	udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
+						&flags);
+	udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
+
+	pp = NULL;
+	while ((pp = of_get_next_child(np, pp)))
+		udc->num_ep++;
+
+	eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
+			   GFP_KERNEL);
+	if (!eps)
+		return ERR_PTR(-ENOMEM);
+
+	udc->gadget.ep0 = &eps[0].ep;
+
+	INIT_LIST_HEAD(&eps[0].ep.ep_list);
+
+	pp = NULL;
+	i = 0;
+	while ((pp = of_get_next_child(np, pp))) {
+		ep = &eps[i];
+
+		ret = of_property_read_u32(pp, "reg", &val);
+		if (ret) {
+			dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
+			goto err;
+		}
+		ep->index = val;
+
+		ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
+		if (ret) {
+			dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
+			goto err;
+		}
+		ep->fifo_size = val;
+
+		ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
+		if (ret) {
+			dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
+			goto err;
+		}
+		ep->nr_banks = val;
+
+		ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
+		ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
+
+		ret = of_property_read_string(pp, "name", &name);
+		ep->ep.name = name;
+
+		ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
+		ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
+		ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
+		ep->ep.ops = &usba_ep_ops;
+		ep->ep.maxpacket = ep->fifo_size;
+		ep->udc = udc;
+		INIT_LIST_HEAD(&ep->queue);
+
+		if (i)
+			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+
+		i++;
+	}
+
+	return eps;
+err:
+	return ERR_PTR(ret);
+}
+#else
+static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
+						    struct usba_udc *udc)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
+static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
+						 struct usba_udc *udc)
 {
 	struct usba_platform_data *pdata = pdev->dev.platform_data;
+	struct usba_ep *eps;
+	int i;
+
+	if (!pdata)
+		return ERR_PTR(-ENXIO);
+
+	eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
+			   GFP_KERNEL);
+	if (!eps)
+		return ERR_PTR(-ENOMEM);
+
+	udc->gadget.ep0 = &eps[0].ep;
+
+	udc->vbus_pin = pdata->vbus_pin;
+	udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
+	udc->num_ep = pdata->num_ep;
+
+	INIT_LIST_HEAD(&eps[0].ep.ep_list);
+
+	for (i = 0; i < pdata->num_ep; i++) {
+		struct usba_ep *ep = &eps[i];
+
+		ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
+		ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
+		ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
+		ep->ep.ops = &usba_ep_ops;
+		ep->ep.name = pdata->ep[i].name;
+		ep->fifo_size = ep->ep.maxpacket = pdata->ep[i].fifo_size;
+		ep->udc = udc;
+		INIT_LIST_HEAD(&ep->queue);
+		ep->nr_banks = pdata->ep[i].nr_banks;
+		ep->index = pdata->ep[i].index;
+		ep->can_dma = pdata->ep[i].can_dma;
+		ep->can_isoc = pdata->ep[i].can_isoc;
+
+		if (i)
+			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+	}
+
+	return eps;
+}
+
+static int __init usba_udc_probe(struct platform_device *pdev)
+{
 	struct resource *regs, *fifo;
 	struct clk *pclk, *hclk;
 	struct usba_udc *udc;
-	static struct usba_ep *usba_ep;
 	int irq, ret, i;
 
 	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
···
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
 	fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
-	if (!regs || !fifo || !pdata)
+	if (!regs || !fifo)
 		return -ENXIO;
 
 	irq = platform_get_irq(pdev, 0);
···
 	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
 	clk_disable(pclk);
 
-	usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
-			  GFP_KERNEL);
-	if (!usba_ep)
+	if (pdev->dev.of_node)
+		udc->usba_ep = atmel_udc_of_init(pdev, udc);
+	else
+		udc->usba_ep = usba_udc_pdata(pdev, udc);
+
+	if (IS_ERR(udc->usba_ep)) {
+		ret = PTR_ERR(udc->usba_ep);
 		goto err_alloc_ep;
-
-	udc->usba_ep = usba_ep;
-	udc->gadget.ep0 = &usba_ep[0].ep;
-
-	INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
-	usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
-	usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
-	usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
-	usba_ep[0].ep.ops = &usba_ep_ops;
-	usba_ep[0].ep.name = pdata->ep[0].name;
-	usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
-	usba_ep[0].udc = udc;
-	INIT_LIST_HEAD(&usba_ep[0].queue);
-	usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
-	usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
-	usba_ep[0].index = pdata->ep[0].index;
-	usba_ep[0].can_dma = pdata->ep[0].can_dma;
-	usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
-
-	for (i = 1; i < pdata->num_ep; i++) {
-		struct usba_ep *ep = &usba_ep[i];
-
-		ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
-		ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
-		ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
-		ep->ep.ops = &usba_ep_ops;
-		ep->ep.name = pdata->ep[i].name;
-		ep->ep.maxpacket = pdata->ep[i].fifo_size;
-		ep->udc = udc;
-		INIT_LIST_HEAD(&ep->queue);
-		ep->fifo_size = pdata->ep[i].fifo_size;
-		ep->nr_banks = pdata->ep[i].nr_banks;
-		ep->index = pdata->ep[i].index;
-		ep->can_dma = pdata->ep[i].can_dma;
-		ep->can_isoc = pdata->ep[i].can_isoc;
-
-		list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 	}
 
 	ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
···
 	}
 	udc->irq = irq;
 
-	if (gpio_is_valid(pdata->vbus_pin)) {
-		if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
-			udc->vbus_pin = pdata->vbus_pin;
-			udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
-
+	if (gpio_is_valid(udc->vbus_pin)) {
+		if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
 			ret = request_irq(gpio_to_irq(udc->vbus_pin),
 					usba_vbus_irq, 0,
 					"atmel_usba_udc", udc);
 			if (ret) {
-				gpio_free(udc->vbus_pin);
 				udc->vbus_pin = -ENODEV;
 				dev_warn(&udc->pdev->dev,
 					 "failed to request vbus irq; "
···
 		goto err_add_udc;
 
 	usba_init_debugfs(udc);
-	for (i = 1; i < pdata->num_ep; i++)
-		usba_ep_init_debugfs(udc, &usba_ep[i]);
+	for (i = 1; i < udc->num_ep; i++)
+		usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
 
 	return 0;
 
 err_add_udc:
-	if (gpio_is_valid(pdata->vbus_pin)) {
+	if (gpio_is_valid(udc->vbus_pin))
 		free_irq(gpio_to_irq(udc->vbus_pin), udc);
-		gpio_free(udc->vbus_pin);
-	}
 
 	free_irq(irq, udc);
 err_request_irq:
-	kfree(usba_ep);
 err_alloc_ep:
 	iounmap(udc->fifo);
 err_map_fifo:
···
 {
 	struct usba_udc *udc;
 	int i;
-	struct usba_platform_data *pdata = pdev->dev.platform_data;
 
 	udc = platform_get_drvdata(pdev);
 
 	usb_del_gadget_udc(&udc->gadget);
 
-	for (i = 1; i < pdata->num_ep; i++)
+	for (i = 1; i < udc->num_ep; i++)
 		usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
 	usba_cleanup_debugfs(udc);
 
 	if (gpio_is_valid(udc->vbus_pin)) {
 		free_irq(gpio_to_irq(udc->vbus_pin), udc);
-		gpio_free(udc->vbus_pin);
 	}
 
 	free_irq(udc->irq, udc);
-	kfree(usba_ep);
 	iounmap(udc->fifo);
 	iounmap(udc->regs);
 	clk_put(udc->hclk);
···
 	return 0;
 }
 
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_udc_dt_ids[] = {
+	{ .compatible = "atmel,at91sam9rl-udc" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
+#endif
+
 static struct platform_driver udc_driver = {
 	.remove		= __exit_p(usba_udc_remove),
 	.driver		= {
 		.name		= "atmel_usba_udc",
 		.owner		= THIS_MODULE,
+		.of_match_table	= of_match_ptr(atmel_udc_dt_ids),
 	},
 };
 

drivers/usb/gadget/atmel_usba_udc.h

···
 	int irq;
 	int vbus_pin;
 	int vbus_pin_inverted;
+	int num_ep;
 	struct clk *pclk;
 	struct clk *hclk;
 	struct usba_ep *usba_ep;