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131 lines
3.7 KiB
131 lines
3.7 KiB
From e8ede0f62b39a3d3b06ae3dc04a74680a1f0a64b Mon Sep 17 00:00:00 2001
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From: Linus Walleij <linus.walleij@linaro.org>
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Date: Fri, 21 Apr 2017 22:19:00 +0200
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Subject: [PATCH 30/31] usb: host: fotg2: add Gemini-specific handling
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The Cortina Systems Gemini has bolted on a PHY inside the
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silicon that can be handled by six bits in a MISC register in
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the system controller.
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If we are running on Gemini, look up a syscon regmap through
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a phandle and enable VBUS and optionally the Mini-B connector.
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If the device is flagged as "wakeup-source" using the standard
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DT bindings, we also enable this in the global controller for
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respective port.
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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---
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drivers/usb/host/Kconfig | 1 +
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drivers/usb/host/fotg210-hcd.c | 76 ++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 77 insertions(+)
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--- a/drivers/usb/host/Kconfig
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+++ b/drivers/usb/host/Kconfig
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@@ -375,6 +375,7 @@ config USB_ISP1362_HCD
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config USB_FOTG210_HCD
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tristate "FOTG210 HCD support"
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depends on USB && HAS_DMA && HAS_IOMEM
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+ select MFD_SYSCON
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---help---
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Faraday FOTG210 is an OTG controller which can be configured as
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an USB2.0 host. It is designed to meet USB2.0 EHCI specification
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--- a/drivers/usb/host/fotg210-hcd.c
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+++ b/drivers/usb/host/fotg210-hcd.c
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@@ -46,6 +46,10 @@
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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+#include <linux/bitops.h>
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+/* For Cortina Gemini */
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+#include <linux/mfd/syscon.h>
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+#include <linux/regmap.h>
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#include <asm/byteorder.h>
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#include <asm/irq.h>
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@@ -5583,6 +5587,72 @@ static void fotg210_init(struct fotg210_
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iowrite32(value, &fotg210->regs->otgcsr);
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}
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+/*
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+ * Gemini-specific initialization function, only executed on the
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+ * Gemini SoC using the global misc control register.
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+ */
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+#define GEMINI_GLOBAL_MISC_CTRL 0x30
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+#define GEMINI_MISC_USB0_WAKEUP BIT(14)
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+#define GEMINI_MISC_USB1_WAKEUP BIT(15)
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+#define GEMINI_MISC_USB0_VBUS_ON BIT(22)
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+#define GEMINI_MISC_USB1_VBUS_ON BIT(23)
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+#define GEMINI_MISC_USB0_MINI_B BIT(29)
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+#define GEMINI_MISC_USB1_MINI_B BIT(30)
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+
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+static int fotg210_gemini_init(struct device *dev, struct usb_hcd *hcd)
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+{
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+ struct device_node *np = dev->of_node;
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+ struct regmap *map;
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+ bool mini_b;
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+ bool wakeup;
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+ u32 mask, val;
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+ int ret;
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+
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+ map = syscon_regmap_lookup_by_phandle(np, "syscon");
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+ if (IS_ERR(map)) {
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+ dev_err(dev, "no syscon\n");
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+ return PTR_ERR(map);
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+ }
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+ mini_b = of_property_read_bool(np, "cortina,gemini-mini-b");
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+ wakeup = of_property_read_bool(np, "wakeup-source");
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+
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+ /*
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+ * Figure out if this is USB0 or USB1 by simply checking the
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+ * physical base address.
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+ */
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+ mask = 0;
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+ if (hcd->rsrc_start == 0x69000000) {
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+ val = GEMINI_MISC_USB1_VBUS_ON;
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+ if (mini_b)
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+ val |= GEMINI_MISC_USB1_MINI_B;
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+ else
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+ mask |= GEMINI_MISC_USB1_MINI_B;
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+ if (wakeup)
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+ val |= GEMINI_MISC_USB1_WAKEUP;
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+ else
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+ mask |= GEMINI_MISC_USB1_WAKEUP;
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+ } else {
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+ val = GEMINI_MISC_USB0_VBUS_ON;
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+ if (mini_b)
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+ val |= GEMINI_MISC_USB0_MINI_B;
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+ else
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+ mask |= GEMINI_MISC_USB0_MINI_B;
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+ if (wakeup)
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+ val |= GEMINI_MISC_USB0_WAKEUP;
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+ else
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+ mask |= GEMINI_MISC_USB0_WAKEUP;
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+ }
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+
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+ ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, mask, val);
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+ if (ret) {
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+ dev_err(dev, "failed to initialize Gemini PHY\n");
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+ return ret;
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+ }
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+
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+ dev_info(dev, "initialized Gemini PHY\n");
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+ return 0;
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+}
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+
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/**
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* fotg210_hcd_probe - initialize faraday FOTG210 HCDs
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*
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@@ -5662,6 +5732,12 @@ static int fotg210_hcd_probe(struct plat
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fotg210_init(fotg210);
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+ if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
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+ retval = fotg210_gemini_init(dev, hcd);
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+ if (retval)
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+ goto failed_dis_clk;
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+ }
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+
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (retval) {
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dev_err(dev, "failed to add hcd with err %d\n", retval);
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