usb: omap1: OTG controller driver

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@iki.fi>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 921a9f43e309bd9f8d99ced43cd931a9b465839d..0dbab6f5c2d4f2f95fd3213893f3a514ebc4d916 100644 (file)
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -142,6 +142,16 @@ 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 1bf6c083a36e7874daefc12f223a3248303697b4..64a9345e5633b718833ae8a3c4360ff49dbb0fbb 100644 (file)
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_NOP_USB_XCEIV)           += phy-generic.o
 obj-$(CONFIG_OMAP_CONTROL_USB)         += phy-omap-control.o
 obj-$(CONFIG_AM335X_CONTROL_USB)       += phy-am335x-control.o
 obj-$(CONFIG_AM335X_PHY_USB)           += phy-am335x.o
+obj-$(CONFIG_OMAP_OTG)                 += phy-omap-otg.o
 obj-$(CONFIG_OMAP_USB3)                        += phy-omap-usb3.o
 obj-$(CONFIG_SAMSUNG_USBPHY)           += phy-samsung-usb.o
 obj-$(CONFIG_SAMSUNG_USB2PHY)          += phy-samsung-usb2.o

diff --git a/drivers/usb/phy/phy-omap-otg.c b/drivers/usb/phy/phy-omap-otg.c
new file mode 100644 (file)
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@iki.fi>");