[PATCH v3 3/4] USB: OMAP1: OTG controller driver
Aaro Koskinen
aaro.koskinen at iki.fi
Tue Jun 18 13:07:00 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 | 169 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 180 insertions(+)
create mode 100644 drivers/usb/phy/phy-omap-otg.c
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7ef3eb8..14a50bd 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 && EXTCON
+ 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..11598cd
--- /dev/null
+++ b/drivers/usb/phy/phy-omap-otg.c
@@ -0,0 +1,169 @@
+/*
+ * 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 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.
+ *
+ * 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/extcon.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/usb-omap1.h>
+
+struct otg_device {
+ void __iomem *base;
+ bool id;
+ bool vbus;
+ struct extcon_specific_cable_nb vbus_dev;
+ struct extcon_specific_cable_nb id_dev;
+ struct notifier_block vbus_nb;
+ struct notifier_block id_nb;
+};
+
+#define OMAP_OTG_CTRL 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(struct otg_device *otg_dev, u32 outputs)
+{
+ u32 l;
+
+ l = readl(otg_dev->base + OMAP_OTG_CTRL);
+ l &= ~OMAP_OTG_XCEIV_OUTPUTS;
+ l |= outputs;
+ writel(l, otg_dev->base + OMAP_OTG_CTRL);
+}
+
+static void omap_otg_set_mode(struct otg_device *otg_dev)
+{
+ if (!otg_dev->id && otg_dev->vbus)
+ /* Set B-session valid. */
+ omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
+ else if (otg_dev->vbus)
+ /* Set A-session valid. */
+ omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
+ else if (!otg_dev->id)
+ /* Set B-session end to indicate no VBUS. */
+ omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
+}
+
+static int omap_otg_id_notifier(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
+
+ otg_dev->id = event;
+ omap_otg_set_mode(otg_dev);
+
+ return NOTIFY_DONE;
+}
+
+static int omap_otg_vbus_notifier(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct otg_device *otg_dev = container_of(nb, struct otg_device,
+ vbus_nb);
+
+ otg_dev->vbus = event;
+ omap_otg_set_mode(otg_dev);
+
+ return NOTIFY_DONE;
+}
+
+static int omap_otg_probe(struct platform_device *pdev)
+{
+ const struct omap_usb_config *config = pdev->dev.platform_data;
+ struct otg_device *otg_dev;
+ struct extcon_dev *extcon;
+ int ret;
+ u32 rev;
+
+ if (!config || !config->extcon)
+ return -ENODEV;
+
+ extcon = extcon_get_extcon_dev(config->extcon);
+ if (!extcon)
+ return -EPROBE_DEFER;
+
+ otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
+ if (!otg_dev)
+ return -ENOMEM;
+
+ otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
+ if (IS_ERR(otg_dev->base))
+ return PTR_ERR(otg_dev->base);
+
+ otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
+ otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
+
+ ret = extcon_register_interest(&otg_dev->id_dev, config->extcon,
+ "USB-HOST", &otg_dev->id_nb);
+ if (ret)
+ return ret;
+
+ ret = extcon_register_interest(&otg_dev->vbus_dev, config->extcon,
+ "USB", &otg_dev->vbus_nb);
+ if (ret) {
+ extcon_unregister_interest(&otg_dev->id_dev);
+ return ret;
+ }
+
+ otg_dev->id = extcon_get_cable_state(extcon, "USB-HOST");
+ otg_dev->vbus = extcon_get_cable_state(extcon, "USB");
+ omap_otg_set_mode(otg_dev);
+
+ rev = readl(otg_dev->base);
+
+ dev_info(&pdev->dev,
+ "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
+ (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
+ otg_dev->vbus);
+
+ return 0;
+}
+
+static int omap_otg_remove(struct platform_device *pdev)
+{
+ struct otg_device *otg_dev = platform_get_drvdata(pdev);
+
+ extcon_unregister_interest(&otg_dev->id_dev);
+ extcon_unregister_interest(&otg_dev->vbus_dev);
+
+ return 0;
+}
+
+static struct platform_driver omap_otg_driver = {
+ .probe = omap_otg_probe,
+ .remove = omap_otg_remove,
+ .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>");
--
1.8.3.1
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