usb: fotg210: Acquire memory resource in core

The subdrivers are obtaining and mapping the memory resource
separately. Create a common state container for the shared
resources and start populating this by acquiring the IO
memory resource and remap it and pass this to the subdrivers
for host and peripheral.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230103-gemini-fotg210-usb-v2-3-100388af9810@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/fotg210/fotg210-core.c

@@ -33,9 +33,10 @@
 #define GEMINI_MISC_USB0_MINI_B		BIT(29)
 #define GEMINI_MISC_USB1_MINI_B		BIT(30)
 
-static int fotg210_gemini_init(struct device *dev, struct resource *res,
+static int fotg210_gemini_init(struct fotg210 *fotg, struct resource *res,
 			       enum usb_dr_mode mode)
 {
+	struct device *dev = fotg->dev;
 	struct device_node *np = dev->of_node;
 	struct regmap *map;
 	bool wakeup;
@@ -47,6 +48,7 @@ static int fotg210_gemini_init(struct device *dev, struct resource *res,
 		dev_err(dev, "no syscon\n");
 		return PTR_ERR(map);
 	}
+	fotg->map = map;
 	wakeup = of_property_read_bool(np, "wakeup-source");
 
 	/*
@@ -55,6 +57,7 @@ static int fotg210_gemini_init(struct device *dev, struct resource *res,
 	 */
 	mask = 0;
 	if (res->start == 0x69000000) {
+		fotg->port = GEMINI_PORT_1;
 		mask = GEMINI_MISC_USB1_VBUS_ON | GEMINI_MISC_USB1_MINI_B |
 			GEMINI_MISC_USB1_WAKEUP;
 		if (mode == USB_DR_MODE_HOST)
@@ -64,6 +67,7 @@ static int fotg210_gemini_init(struct device *dev, struct resource *res,
 		if (wakeup)
 			val |= GEMINI_MISC_USB1_WAKEUP;
 	} else {
+		fotg->port = GEMINI_PORT_0;
 		mask = GEMINI_MISC_USB0_VBUS_ON | GEMINI_MISC_USB0_MINI_B |
 			GEMINI_MISC_USB0_WAKEUP;
 		if (mode == USB_DR_MODE_HOST)
@@ -89,23 +93,34 @@ static int fotg210_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	enum usb_dr_mode mode;
+	struct fotg210 *fotg;
 	int ret;
 
+	fotg = devm_kzalloc(dev, sizeof(*fotg), GFP_KERNEL);
+	if (!fotg)
+		return -ENOMEM;
+	fotg->dev = dev;
+
+	fotg->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!fotg->res)
+		return -ENODEV;
+
+	fotg->base = devm_ioremap_resource(dev, fotg->res);
+	if (!fotg->base)
+		return -ENOMEM;
+
 	mode = usb_get_dr_mode(dev);
 
 	if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
-		struct resource *res;
-
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		ret = fotg210_gemini_init(dev, res, mode);
+		ret = fotg210_gemini_init(fotg, fotg->res, mode);
 		if (ret)
 			return ret;
 	}
 
 	if (mode == USB_DR_MODE_PERIPHERAL)
-		ret = fotg210_udc_probe(pdev);
+		ret = fotg210_udc_probe(pdev, fotg);
 	else
-		ret = fotg210_hcd_probe(pdev);
+		ret = fotg210_hcd_probe(pdev, fotg);
 
 	return ret;
 }

drivers/usb/fotg210/fotg210-hcd.c

@@ -5557,11 +5557,10 @@ static void fotg210_init(struct fotg210_hcd *fotg210)
  * then invokes the start() method for the HCD associated with it
  * through the hotplug entry's driver_data.
  */
-int fotg210_hcd_probe(struct platform_device *pdev)
+int fotg210_hcd_probe(struct platform_device *pdev, struct fotg210 *fotg)
 {
 	struct device *dev = &pdev->dev;
 	struct usb_hcd *hcd;
-	struct resource *res;
 	int irq;
 	int retval;
 	struct fotg210_hcd *fotg210;
@@ -5585,18 +5584,14 @@ int fotg210_hcd_probe(struct platform_device *pdev)
 
 	hcd->has_tt = 1;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(hcd->regs)) {
-		retval = PTR_ERR(hcd->regs);
-		goto failed_put_hcd;
-	}
+	hcd->regs = fotg->base;
 
-	hcd->rsrc_start = res->start;
-	hcd->rsrc_len = resource_size(res);
+	hcd->rsrc_start = fotg->res->start;
+	hcd->rsrc_len = resource_size(fotg->res);
 
 	fotg210 = hcd_to_fotg210(hcd);
 
+	fotg210->fotg = fotg;
 	fotg210->caps = hcd->regs;
 
 	/* It's OK not to supply this clock */

drivers/usb/fotg210/fotg210-hcd.h

@@ -182,6 +182,7 @@ struct fotg210_hcd {			/* one per controller */
 #	define INCR(x) do {} while (0)
 #endif
 
+	struct fotg210		*fotg;		/* Overarching FOTG210 device */
 	/* silicon clock */
 	struct clk		*pclk;
 };

drivers/usb/fotg210/fotg210-udc.c

@@ -1142,21 +1142,14 @@ int fotg210_udc_remove(struct platform_device *pdev)
 	return 0;
 }
 
-int fotg210_udc_probe(struct platform_device *pdev)
+int fotg210_udc_probe(struct platform_device *pdev, struct fotg210 *fotg)
 {
-	struct resource *res;
 	struct fotg210_udc *fotg210 = NULL;
 	struct device *dev = &pdev->dev;
 	int irq;
 	int ret = 0;
 	int i;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		pr_err("platform_get_resource error.\n");
-		return -ENODEV;
-	}
-
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		pr_err("could not get irq\n");
@@ -1169,6 +1162,7 @@ int fotg210_udc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	fotg210->dev = dev;
+	fotg210->fotg = fotg;
 
 	/* It's OK not to supply this clock */
 	fotg210->pclk = devm_clk_get(dev, "PCLK");
@@ -1209,11 +1203,7 @@ int fotg210_udc_probe(struct platform_device *pdev)
 			goto err_alloc;
 	}
 
-	fotg210->reg = ioremap(res->start, resource_size(res));
-	if (fotg210->reg == NULL) {
-		dev_err(dev, "ioremap error\n");
-		goto err_alloc;
-	}
+	fotg210->reg = fotg->base;
 
 	spin_lock_init(&fotg210->lock);
 

drivers/usb/fotg210/fotg210-udc.h

@@ -236,6 +236,7 @@ struct fotg210_udc {
 	unsigned long		irq_trigger;
 
 	struct device			*dev;
+	struct fotg210			*fotg;
 	struct usb_phy			*phy;
 	struct usb_gadget		gadget;
 	struct usb_gadget_driver	*driver;

drivers/usb/fotg210/fotg210.h

@@ -2,13 +2,28 @@
 #ifndef __FOTG210_H
 #define __FOTG210_H
 
+enum gemini_port {
+	GEMINI_PORT_NONE = 0,
+	GEMINI_PORT_0,
+	GEMINI_PORT_1,
+};
+
+struct fotg210 {
+	struct device *dev;
+	struct resource *res;
+	void __iomem *base;
+	struct regmap *map;
+	enum gemini_port port;
+};
+
 #ifdef CONFIG_USB_FOTG210_HCD
-int fotg210_hcd_probe(struct platform_device *pdev);
+int fotg210_hcd_probe(struct platform_device *pdev, struct fotg210 *fotg);
 int fotg210_hcd_remove(struct platform_device *pdev);
 int fotg210_hcd_init(void);
 void fotg210_hcd_cleanup(void);
 #else
-static inline int fotg210_hcd_probe(struct platform_device *pdev)
+static inline int fotg210_hcd_probe(struct platform_device *pdev,
+				    struct fotg210 *fotg)
 {
 	return 0;
 }
@@ -26,10 +41,11 @@ static inline void fotg210_hcd_cleanup(void)
 #endif
 
 #ifdef CONFIG_USB_FOTG210_UDC
-int fotg210_udc_probe(struct platform_device *pdev);
+int fotg210_udc_probe(struct platform_device *pdev, struct fotg210 *fotg);
 int fotg210_udc_remove(struct platform_device *pdev);
 #else
-static inline int fotg210_udc_probe(struct platform_device *pdev)
+static inline int fotg210_udc_probe(struct platform_device *pdev,
+				    struct fotg210 *fotg)
 {
 	return 0;
 }