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From f7f6c8aca91093e2f886ec97910b1a7d9a69bf9b Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Wed, 9 Nov 2022 21:05:54 +0100
Subject: [PATCH 05/29] 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: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221109200554.1957185-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
--- a/drivers/usb/fotg210/Kconfig
+++ b/drivers/usb/fotg210/Kconfig
@@ -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.
--- a/drivers/usb/fotg210/fotg210-core.c
+++ b/drivers/usb/fotg210/fotg210-core.c
@@ -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
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
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