[PATCH 2/3] USB: OMAP: add omap-otg
Aaro Koskinen
aaro.koskinen at iki.fi
Sun Jun 9 18:40:05 EDT 2013
Transceivers need to manage OTG controller state on OMAP1 to enable
switching between peripheral and host modes. Provide a driver for that.
Signed-off-by: Aaro Koskinen <aaro.koskinen at iki.fi>
---
drivers/usb/phy/Kconfig | 10 ++++
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/phy-omap-otg.c | 126 ++++++++++++++++++++++++++++++++++++++++
include/linux/usb/omap-otg.h | 19 ++++++
4 files changed, 156 insertions(+)
create mode 100644 drivers/usb/phy/phy-omap-otg.c
create mode 100644 include/linux/usb/omap-otg.h
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7ef3eb8..2d2cd5f 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -135,6 +135,16 @@ config USB_GPIO_VBUS
optionally control of a D+ pullup GPIO as well as a VBUS
current limit regulator.
+config OMAP_OTG
+ tristate "OMAP USB OTG controller driver"
+ depends on ARCH_OMAP_OTG
+ help
+ Enable this to support some transceivers on OMAP1 platforms. OTG
+ controller is needed to switch between host and peripheral modes.
+
+ This driver can also be built as a module. If so, the module
+ will be called omap-otg.
+
config USB_ISP1301
tristate "NXP ISP1301 USB transceiver support"
depends on USB || USB_GADGET
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index a9169cb..c7f391b 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_ISP1301_OMAP) += phy-isp1301-omap.o
obj-$(CONFIG_MV_U3D_PHY) += phy-mv-u3d-usb.o
obj-$(CONFIG_NOP_USB_XCEIV) += phy-nop.o
obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o
+obj-$(CONFIG_OMAP_OTG) += phy-omap-otg.o
obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o
obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o
diff --git a/drivers/usb/phy/phy-omap-otg.c b/drivers/usb/phy/phy-omap-otg.c
new file mode 100644
index 0000000..cb00ffe
--- /dev/null
+++ b/drivers/usb/phy/phy-omap-otg.c
@@ -0,0 +1,126 @@
+/*
+ * OMAP OTG controller driver
+ *
+ * Based on code from tahvo-usb.c and isp1301_omap.c drivers.
+ *
+ * Copyright (C) 2005-2006 Nokia Corporation
+ * Copyright (C) 2004 Texas Instruments
+ * Copyright (C) 2004 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/usb/omap-otg.h>
+#include <linux/platform_device.h>
+
+struct otg_device {
+ void __iomem *base;
+ struct mutex serialize;
+};
+static struct otg_device *otg_dev;
+
+#define OMAP_OTG_CTRL (otg_dev->base + 0x0c)
+#define OMAP_OTG_ASESSVLD (1 << 20)
+#define OMAP_OTG_BSESSEND (1 << 19)
+#define OMAP_OTG_BSESSVLD (1 << 18)
+#define OMAP_OTG_VBUSVLD (1 << 17)
+#define OMAP_OTG_ID (1 << 16)
+#define OMAP_OTG_XCEIV_OUTPUTS \
+ (OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
+ OMAP_OTG_VBUSVLD | OMAP_OTG_ID)
+
+static void omap_otg_ctrl(u32 outputs)
+{
+ u32 l;
+
+ l = readl(OMAP_OTG_CTRL);
+ l &= ~OMAP_OTG_XCEIV_OUTPUTS;
+ l |= outputs;
+ writel(l, OMAP_OTG_CTRL);
+}
+
+void omap_otg_set_mode(enum omap_otg_mode mode)
+{
+ if (!otg_dev) {
+ WARN(1, "%s: controller not present\n", __func__);
+ return;
+ }
+ mutex_lock(&otg_dev->serialize);
+ switch (mode) {
+ case OMAP_OTG_MODE_DEVICE:
+ /*
+ * Set B-session valid.
+ */
+ omap_otg_ctrl(OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
+ break;
+ case OMAP_OTG_MODE_HOST:
+ /*
+ * Set A-session valid.
+ */
+ omap_otg_ctrl(OMAP_OTG_ASESSVLD);
+ break;
+ case OMAP_OTG_MODE_DISCONNECT:
+ /*
+ * Set B-session end to indicate no VBUS.
+ */
+ omap_otg_ctrl(OMAP_OTG_ID | OMAP_OTG_BSESSEND);
+ break;
+ default:
+ WARN(1, "%s: unknown mode: %d\n", __func__, mode);
+ }
+ mutex_unlock(&otg_dev->serialize);
+}
+EXPORT_SYMBOL_GPL(omap_otg_set_mode);
+
+static int omap_otg_probe(struct platform_device *dev)
+{
+ struct otg_device *odev;
+ u32 rev;
+
+ if (otg_dev)
+ return -EBUSY;
+
+ odev = devm_kzalloc(&dev->dev, sizeof(*odev), GFP_KERNEL);
+ if (!odev)
+ return -ENOMEM;
+
+ odev->base = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
+ if (IS_ERR(odev->base))
+ return PTR_ERR(odev->base);
+
+ rev = readl(odev->base);
+ dev_info(&dev->dev, "OMAP USB OTG controller rev %d.%d\n",
+ (rev >> 4) & 0xf, rev & 0xf);
+
+ mutex_init(&odev->serialize);
+
+ otg_dev = odev;
+
+ return 0;
+}
+
+static struct platform_driver omap_otg_driver = {
+ .probe = omap_otg_probe,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "omap_otg",
+ },
+};
+module_platform_driver(omap_otg_driver);
+
+MODULE_DESCRIPTION("OMAP USB OTG controller driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen at iki.fi>");
diff --git a/include/linux/usb/omap-otg.h b/include/linux/usb/omap-otg.h
new file mode 100644
index 0000000..fb3d7ab
--- /dev/null
+++ b/include/linux/usb/omap-otg.h
@@ -0,0 +1,19 @@
+/*
+ * OMAP OTG driver
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive for
+ * more details.
+ */
+#ifndef __LINUX_OMAP_OTG_H
+#define __LINUX_OMAP_OTG_H
+
+enum omap_otg_mode {
+ OMAP_OTG_MODE_DEVICE,
+ OMAP_OTG_MODE_HOST,
+ OMAP_OTG_MODE_DISCONNECT,
+};
+
+void omap_otg_set_mode(enum omap_otg_mode mode);
+
+#endif /* __LINUX_OMAP_OTG_H */
--
1.7.10.4
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