From 3aaff88a0f5e154aa5a489d59fd4015a2a937c23 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Fri, 21 Apr 2017 22:19:00 +0200
Subject: [PATCH 1/7] usb: host: 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>
---
drivers/usb/host/Kconfig | 1 +
drivers/usb/host/fotg210-hcd.c | 76 ++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -363,6 +363,7 @@ config USB_ISP1362_HCD
config USB_FOTG210_HCD
tristate "FOTG210 HCD support"
depends on USB && HAS_DMA && HAS_IOMEM
+ select MFD_SYSCON
---help---
Faraday FOTG210 is an OTG controller which can be configured as
an USB2.0 host. It is designed to meet USB2.0 EHCI specification
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -33,6 +33,10 @@
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
+#include <linux/bitops.h>
+/* For Cortina Gemini */
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
@@ -5558,6 +5562,72 @@ static void fotg210_init(struct fotg210_
iowrite32(value, &fotg210->regs->otgcsr);
}
+/*
+ * Gemini-specific initialization function, only executed on the
+ * Gemini SoC using the global misc control register.
+ */
+#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 usb_hcd *hcd)
+{
+ struct device_node *np = dev->of_node;
+ struct regmap *map;
+ bool mini_b;
+ 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);
+ }
+ mini_b = of_property_read_bool(np, "cortina,gemini-mini-b");
+ 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 (hcd->rsrc_start == 0x69000000) {
+ val = GEMINI_MISC_USB1_VBUS_ON;
+ if (mini_b)
+ val |= GEMINI_MISC_USB1_MINI_B;
+ else
+ mask |= GEMINI_MISC_USB1_MINI_B;
+ if (wakeup)
+ val |= GEMINI_MISC_USB1_WAKEUP;
+ else
+ mask |= GEMINI_MISC_USB1_WAKEUP;
+ } else {
+ val = GEMINI_MISC_USB0_VBUS_ON;
+ if (mini_b)
+ val |= GEMINI_MISC_USB0_MINI_B;
+ else
+ mask |= GEMINI_MISC_USB0_MINI_B;
+ if (wakeup)
+ val |= GEMINI_MISC_USB0_WAKEUP;
+ else
+ mask |= 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\n");
+ return 0;
+}
+
/**
* fotg210_hcd_probe - initialize faraday FOTG210 HCDs
*
@@ -5635,6 +5705,12 @@ static int fotg210_hcd_probe(struct plat
fotg210_init(fotg210);
+ if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
+ retval = fotg210_gemini_init(dev, hcd);
+ if (retval)
+ goto failed_dis_clk;
+ }
+
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval) {
dev_err(dev, "failed to add hcd with err %d\n", retval);