--- /dev/null
+/*
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/hcd.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <mach/usb_phy.h>
+#include <mach/legacy_irq.h>
+
+#define TEGRA_USB_PHY_WAKEUP_REG_OFFSET 0x408
+#define TEGRA_VBUS_WAKEUP_SW_VALUE (1 << 12)
+#define TEGRA_VBUS_WAKEUP_SW_ENABLE (1 << 11)
+#define TEGRA_ID_SW_VALUE (1 << 4)
+#define TEGRA_ID_SW_ENABLE (1 << 3)
+
+struct cpcap_otg_data {
+ struct otg_transceiver otg;
+ struct notifier_block nb;
+ void __iomem *regs;
+ struct clk *clk;
+ int irq;
+};
+
+static const char *cpcap_state_name(enum usb_otg_state state)
+{
+ if (state == OTG_STATE_A_HOST)
+ return "HOST";
+ if (state == OTG_STATE_B_PERIPHERAL)
+ return "PERIPHERAL";
+ if (state == OTG_STATE_A_SUSPEND)
+ return "SUSPEND";
+ return "INVALID";
+}
+
+static irqreturn_t cpcap_otg_irq(int irq, void *data)
+{
+ if (tegra_legacy_force_irq_status(irq))
+ tegra_legacy_force_irq_clr(irq);
+ return IRQ_HANDLED;
+}
+
+static int cpcap_otg_notify(struct notifier_block *nb, unsigned long event,
+ void *ignore)
+{
+ struct cpcap_otg_data *cpcap;
+ struct otg_transceiver *otg;
+ enum usb_otg_state from;
+ enum usb_otg_state to;
+ unsigned long val;
+ struct usb_hcd *hcd;
+
+ cpcap = container_of(nb, struct cpcap_otg_data, nb);
+ otg = &cpcap->otg;
+
+ from = otg->state;
+ if (event == USB_EVENT_VBUS)
+ to = OTG_STATE_B_PERIPHERAL;
+ else if (event == USB_EVENT_ID)
+ to = OTG_STATE_A_HOST;
+ else
+ to = OTG_STATE_A_SUSPEND;
+
+ if (from == to)
+ return 0;
+ otg->state = to;
+
+ dev_info(cpcap->otg.dev, "%s --> %s", cpcap_state_name(from),
+ cpcap_state_name(to));
+
+ if ((to == OTG_STATE_A_HOST) && (from == OTG_STATE_A_SUSPEND)
+ && otg->host) {
+ hcd = (struct usb_hcd *)otg->host;
+
+ clk_enable(cpcap->clk);
+
+ val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+ val &= ~TEGRA_ID_SW_VALUE;
+ writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+ } else if ((to == OTG_STATE_A_SUSPEND) && (from == OTG_STATE_A_HOST)
+ && otg->host) {
+ val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+ val |= TEGRA_ID_SW_VALUE;
+ writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+
+ clk_disable(cpcap->clk);
+
+ } else if ((to == OTG_STATE_B_PERIPHERAL)
+ && (from == OTG_STATE_A_SUSPEND)
+ && otg->gadget) {
+ clk_enable(cpcap->clk);
+
+ val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+ val |= TEGRA_VBUS_WAKEUP_SW_VALUE;
+ writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+
+ } else if ((to == OTG_STATE_A_SUSPEND)
+ && (from == OTG_STATE_B_PERIPHERAL)
+ && otg->gadget) {
+ val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+ val &= ~TEGRA_VBUS_WAKEUP_SW_VALUE;
+ writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+
+ clk_disable(cpcap->clk);
+ } else
+ return 0;
+
+ tegra_legacy_force_irq_set(cpcap->irq);
+ return 0;
+}
+
+static int cpcap_otg_set_peripheral(struct otg_transceiver *otg,
+ struct usb_gadget *gadget)
+{
+ otg->gadget = gadget;
+ return 0;
+}
+
+static int cpcap_otg_set_host(struct otg_transceiver *otg,
+ struct usb_bus *host)
+{
+ otg->host = host;
+ return 0;
+}
+
+static int cpcap_otg_set_power(struct otg_transceiver *otg, unsigned mA)
+{
+ return 0;
+}
+
+static int cpcap_otg_set_suspend(struct otg_transceiver *otg, int suspend)
+{
+ return 0;
+}
+
+static int __init cpcap_otg_probe(struct platform_device *pdev)
+{
+ struct cpcap_otg_data *cpcap;
+ struct resource *res;
+ unsigned long val;
+ int err;
+
+ cpcap = kzalloc(sizeof(struct cpcap_otg_data), GFP_KERNEL);
+ if (!cpcap)
+ return -ENOMEM;
+
+ cpcap->otg.dev = &pdev->dev;
+ cpcap->otg.label = "cpcap-otg";
+ cpcap->otg.state = OTG_STATE_UNDEFINED;
+ cpcap->otg.set_host = cpcap_otg_set_host;
+ cpcap->otg.set_peripheral = cpcap_otg_set_peripheral;
+ cpcap->otg.set_suspend = cpcap_otg_set_suspend;
+ cpcap->otg.set_power = cpcap_otg_set_power;
+
+ platform_set_drvdata(pdev, cpcap);
+
+ cpcap->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(cpcap->clk)) {
+ dev_err(&pdev->dev, "Can't get otg clock\n");
+ err = PTR_ERR(cpcap->clk);
+ goto err_clk;
+ }
+
+ err = clk_enable(cpcap->clk);
+ if (err)
+ goto err_clken;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get I/O memory\n");
+ err = -ENXIO;
+ goto err_io;
+ }
+ cpcap->regs = ioremap(res->start, resource_size(res));
+ if (!cpcap->regs) {
+ err = -ENOMEM;
+ goto err_io;
+ }
+
+ cpcap->irq = platform_get_irq(pdev, 0);
+ if (cpcap->irq < 0) {
+ dev_err(&pdev->dev, "Failed to get IRQ\n");
+ err = -ENXIO;
+ goto err_irq;
+ }
+
+ err = request_irq(cpcap->irq, cpcap_otg_irq, IRQF_SHARED,
+ "cpcap-otg", cpcap);
+ if (err) {
+ dev_err(&pdev->dev, "cannot request irq %d err %d\n",
+ cpcap->irq, err);
+ goto err_irq;
+ }
+
+ val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+ val |= TEGRA_VBUS_WAKEUP_SW_ENABLE | TEGRA_ID_SW_ENABLE;
+ val |= TEGRA_ID_SW_VALUE;
+ val &= ~(TEGRA_VBUS_WAKEUP_SW_VALUE);
+ writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
+
+ clk_disable(cpcap->clk);
+ cpcap->otg.state = OTG_STATE_A_SUSPEND;
+
+ BLOCKING_INIT_NOTIFIER_HEAD(&cpcap->otg.notifier);
+ cpcap->nb.notifier_call = cpcap_otg_notify;
+ otg_register_notifier(&cpcap->otg, &cpcap->nb);
+
+ err = otg_set_transceiver(&cpcap->otg);
+ if (err) {
+ dev_err(&pdev->dev, "can't register transceiver (%d)\n", err);
+ goto err_otg;
+ }
+
+ return 0;
+
+err_otg:
+ free_irq(cpcap->irq, cpcap);
+err_irq:
+ iounmap(cpcap->regs);
+err_io:
+ clk_disable(cpcap->clk);
+err_clken:
+ clk_put(cpcap->clk);
+err_clk:
+ platform_set_drvdata(pdev, NULL);
+ kfree(cpcap);
+ return err;
+}
+
+static int __exit cpcap_otg_remove(struct platform_device *pdev)
+{
+ struct cpcap_otg_data *cpcap = platform_get_drvdata(pdev);
+
+ otg_set_transceiver(NULL);
+ free_irq(cpcap->irq, cpcap);
+ iounmap(cpcap->regs);
+ clk_disable(cpcap->clk);
+ clk_put(cpcap->clk);
+ platform_set_drvdata(pdev, NULL);
+ kfree(cpcap);
+
+ return 0;
+}
+
+static struct platform_driver cpcap_otg_driver = {
+ .driver = {
+ .name = "cpcap-otg",
+ },
+ .remove = __exit_p(cpcap_otg_remove),
+ .probe = cpcap_otg_probe,
+};
+
+static int __init cpcap_otg_init(void)
+{
+ return platform_driver_register(&cpcap_otg_driver);
+}
+module_init(cpcap_otg_init);
+
+static void __exit cpcap_otg_exit(void)
+{
+ platform_driver_unregister(&cpcap_otg_driver);
+}
+module_exit(cpcap_otg_exit);
projects / firefly-linux-kernel-4.4.55.git / commitdiff