Commit 00fb05ff authored by Linus Walleij's avatar Linus Walleij Committed by Greg Kroah-Hartman
Browse files

usb: fotg2: add Gemini-specific handling 



The Cortina Systems Gemini has bolted on a PHY inside the
silicon that can be handled by six bits in a MISC register in
the system controller.

If we are running on Gemini, look up a syscon regmap through
a phandle and enable VBUS and optionally the Mini-B connector.

If the device is flagged as "wakeup-source" using the standard
DT bindings, we also enable this in the global controller for
respective port.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221109200554.1957185-1-linus.walleij@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d65e6b6e

drivers/usb/fotg210/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ config USB_FOTG210 
	depends on USB || USB_GADGET

	depends on HAS_DMA && HAS_IOMEM

	default ARCH_GEMINI

	select MFD_SYSCON

	help

	  Faraday FOTG210 is a dual-mode USB controller that can act

	  in both host controller and peripheral controller mode.

drivers/usb/fotg210/fotg210-core.c

+80 −0
Original line number Diff line number Diff line
@@ -5,15 +5,86 @@ 
 * whether to proceed with probing the host or the peripheral

 * driver.

 */

#include <linux/bitops.h>

#include <linux/device.h>

#include <linux/mfd/syscon.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/usb.h>

#include <linux/usb/otg.h>



#include "fotg210.h"



/*

 * Gemini-specific initialization function, only executed on the

 * Gemini SoC using the global misc control register.

 *

 * The gemini USB blocks are connected to either Mini-A (host mode) or

 * Mini-B (peripheral mode) plugs. There is no role switch support on the

 * Gemini SoC, just either-or.

 */

#define GEMINI_GLOBAL_MISC_CTRL		0x30

#define GEMINI_MISC_USB0_WAKEUP		BIT(14)

#define GEMINI_MISC_USB1_WAKEUP		BIT(15)

#define GEMINI_MISC_USB0_VBUS_ON	BIT(22)

#define GEMINI_MISC_USB1_VBUS_ON	BIT(23)

#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,

			       enum usb_dr_mode mode)

{

	struct device_node *np = dev->of_node;

	struct regmap *map;

	bool wakeup;

	u32 mask, val;

	int ret;



	map = syscon_regmap_lookup_by_phandle(np, "syscon");

	if (IS_ERR(map)) {

		dev_err(dev, "no syscon\n");

		return PTR_ERR(map);

	}

	wakeup = of_property_read_bool(np, "wakeup-source");



	/*

	 * Figure out if this is USB0 or USB1 by simply checking the

	 * physical base address.

	 */

	mask = 0;

	if (res->start == 0x69000000) {

		mask = GEMINI_MISC_USB1_VBUS_ON | GEMINI_MISC_USB1_MINI_B |

			GEMINI_MISC_USB1_WAKEUP;

		if (mode == USB_DR_MODE_HOST)

			val = GEMINI_MISC_USB1_VBUS_ON;

		else

			val = GEMINI_MISC_USB1_MINI_B;

		if (wakeup)

			val |= GEMINI_MISC_USB1_WAKEUP;

	} else {

		mask = GEMINI_MISC_USB0_VBUS_ON | GEMINI_MISC_USB0_MINI_B |

			GEMINI_MISC_USB0_WAKEUP;

		if (mode == USB_DR_MODE_HOST)

			val = GEMINI_MISC_USB0_VBUS_ON;

		else

			val = GEMINI_MISC_USB0_MINI_B;

		if (wakeup)

			val |= GEMINI_MISC_USB0_WAKEUP;

	}



	ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, mask, val);

	if (ret) {

		dev_err(dev, "failed to initialize Gemini PHY\n");

		return ret;

	}



	dev_info(dev, "initialized Gemini PHY in %s mode\n",

		 (mode == USB_DR_MODE_HOST) ? "host" : "gadget");

	return 0;

}



static int fotg210_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;
@@ -22,6 +93,15 @@ static int fotg210_probe(struct platform_device *pdev) 


	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);

		if (ret)

			return ret;

	}



	if (mode == USB_DR_MODE_PERIPHERAL)

		ret = fotg210_udc_probe(pdev);

	else