1 files changed, 371 insertions, 0 deletions

diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
new file mode 100644
index 000000000..8ea62c344
--- /dev/null
+++ b/drivers/usb/musb/ux500.c
@@ -0,0 +1,371 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2010 ST-Ericsson AB
+ * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
+ *
+ * Based on omap2430.c
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/usb/musb-ux500.h>
+
+#include "musb_core.h"
+
+static const struct musb_hdrc_config ux500_musb_hdrc_config = {
+	.multipoint	= true,
+	.dyn_fifo	= true,
+	.num_eps	= 16,
+	.ram_bits	= 16,
+};
+
+struct ux500_glue {
+	struct device		*dev;
+	struct platform_device	*musb;
+	struct clk		*clk;
+};
+#define glue_to_musb(g)	platform_get_drvdata(g->musb)
+
+static void ux500_musb_set_vbus(struct musb *musb, int is_on)
+{
+	u8            devctl;
+	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
+	/* HDRC controls CPEN, but beware current surges during device
+	 * connect.  They can trigger transient overcurrent conditions
+	 * that must be ignored.
+	 */
+
+	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+
+	if (is_on) {
+		if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
+			/* start the session */
+			devctl |= MUSB_DEVCTL_SESSION;
+			musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+			/*
+			 * Wait for the musb to set as A device to enable the
+			 * VBUS
+			 */
+			while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
+
+				if (time_after(jiffies, timeout)) {
+					dev_err(musb->controller,
+					"configured as A device timeout");
+					break;
+				}
+			}
+
+		} else {
+			musb->is_active = 1;
+			musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
+			devctl |= MUSB_DEVCTL_SESSION;
+			MUSB_HST_MODE(musb);
+		}
+	} else {
+		musb->is_active = 0;
+
+		/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
+		 * right to B_IDLE...
+		 */
+		devctl &= ~MUSB_DEVCTL_SESSION;
+		MUSB_DEV_MODE(musb);
+	}
+	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+
+	/*
+	 * Devctl values will be updated after vbus goes below
+	 * session_valid. The time taken depends on the capacitance
+	 * on VBUS line. The max discharge time can be upto 1 sec
+	 * as per the spec. Typically on our platform, it is 200ms
+	 */
+	if (!is_on)
+		mdelay(200);
+
+	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
+		usb_otg_state_string(musb->xceiv->otg->state),
+		musb_readb(musb->mregs, MUSB_DEVCTL));
+}
+
+static int musb_otg_notifications(struct notifier_block *nb,
+		unsigned long event, void *unused)
+{
+	struct musb *musb = container_of(nb, struct musb, nb);
+
+	dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
+			event, usb_otg_state_string(musb->xceiv->otg->state));
+
+	switch (event) {
+	case UX500_MUSB_ID:
+		dev_dbg(musb->controller, "ID GND\n");
+		ux500_musb_set_vbus(musb, 1);
+		break;
+	case UX500_MUSB_VBUS:
+		dev_dbg(musb->controller, "VBUS Connect\n");
+		break;
+	case UX500_MUSB_NONE:
+		dev_dbg(musb->controller, "VBUS Disconnect\n");
+		if (is_host_active(musb))
+			ux500_musb_set_vbus(musb, 0);
+		else
+			musb->xceiv->otg->state = OTG_STATE_B_IDLE;
+		break;
+	default:
+		dev_dbg(musb->controller, "ID float\n");
+		return NOTIFY_DONE;
+	}
+	return NOTIFY_OK;
+}
+
+static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
+{
+	unsigned long   flags;
+	irqreturn_t     retval = IRQ_NONE;
+	struct musb     *musb = __hci;
+
+	spin_lock_irqsave(&musb->lock, flags);
+
+	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+	if (musb->int_usb || musb->int_tx || musb->int_rx)
+		retval = musb_interrupt(musb);
+
+	spin_unlock_irqrestore(&musb->lock, flags);
+
+	return retval;
+}
+
+static int ux500_musb_init(struct musb *musb)
+{
+	int status;
+
+	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+	if (IS_ERR_OR_NULL(musb->xceiv)) {
+		pr_err("HS USB OTG: no transceiver configured\n");
+		return -EPROBE_DEFER;
+	}
+
+	musb->nb.notifier_call = musb_otg_notifications;
+	status = usb_register_notifier(musb->xceiv, &musb->nb);
+	if (status < 0) {
+		dev_dbg(musb->controller, "notification register failed\n");
+		return status;
+	}
+
+	musb->isr = ux500_musb_interrupt;
+
+	return 0;
+}
+
+static int ux500_musb_exit(struct musb *musb)
+{
+	usb_unregister_notifier(musb->xceiv, &musb->nb);
+
+	usb_put_phy(musb->xceiv);
+
+	return 0;
+}
+
+static const struct musb_platform_ops ux500_ops = {
+	.quirks		= MUSB_DMA_UX500 | MUSB_INDEXED_EP,
+#ifdef CONFIG_USB_UX500_DMA
+	.dma_init	= ux500_dma_controller_create,
+	.dma_exit	= ux500_dma_controller_destroy,
+#endif
+	.init		= ux500_musb_init,
+	.exit		= ux500_musb_exit,
+	.fifo_mode	= 5,
+
+	.set_vbus	= ux500_musb_set_vbus,
+};
+
+static struct musb_hdrc_platform_data *
+ux500_of_probe(struct platform_device *pdev, struct device_node *np)
+{
+	struct musb_hdrc_platform_data *pdata;
+	const char *mode;
+	int strlen;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	mode = of_get_property(np, "dr_mode", &strlen);
+	if (!mode) {
+		dev_err(&pdev->dev, "No 'dr_mode' property found\n");
+		return NULL;
+	}
+
+	if (strlen > 0) {
+		if (!strcmp(mode, "host"))
+			pdata->mode = MUSB_HOST;
+		if (!strcmp(mode, "otg"))
+			pdata->mode = MUSB_OTG;
+		if (!strcmp(mode, "peripheral"))
+			pdata->mode = MUSB_PERIPHERAL;
+	}
+
+	return pdata;
+}
+
+static int ux500_probe(struct platform_device *pdev)
+{
+	struct musb_hdrc_platform_data	*pdata = dev_get_platdata(&pdev->dev);
+	struct device_node		*np = pdev->dev.of_node;
+	struct platform_device		*musb;
+	struct ux500_glue		*glue;
+	struct clk			*clk;
+	int				ret = -ENOMEM;
+
+	if (!pdata) {
+		if (np) {
+			pdata = ux500_of_probe(pdev, np);
+			if (!pdata)
+				goto err0;
+
+			pdev->dev.platform_data = pdata;
+		} else {
+			dev_err(&pdev->dev, "no pdata or device tree found\n");
+			goto err0;
+		}
+	}
+
+	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
+	if (!glue)
+		goto err0;
+
+	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
+	if (!musb) {
+		dev_err(&pdev->dev, "failed to allocate musb device\n");
+		goto err0;
+	}
+
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "failed to get clock\n");
+		ret = PTR_ERR(clk);
+		goto err1;
+	}
+
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable clock\n");
+		goto err1;
+	}
+
+	musb->dev.parent		= &pdev->dev;
+	musb->dev.dma_mask		= &pdev->dev.coherent_dma_mask;
+	musb->dev.coherent_dma_mask	= pdev->dev.coherent_dma_mask;
+	device_set_of_node_from_dev(&musb->dev, &pdev->dev);
+
+	glue->dev			= &pdev->dev;
+	glue->musb			= musb;
+	glue->clk			= clk;
+
+	pdata->platform_ops		= &ux500_ops;
+	pdata->config 			= &ux500_musb_hdrc_config;
+
+	platform_set_drvdata(pdev, glue);
+
+	ret = platform_device_add_resources(musb, pdev->resource, pdev->num_resources);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add resources\n");
+		goto err2;
+	}
+
+	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add platform_data\n");
+		goto err2;
+	}
+
+	ret = platform_device_add(musb);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register musb device\n");
+		goto err2;
+	}
+
+	return 0;
+
+err2:
+	clk_disable_unprepare(clk);
+
+err1:
+	platform_device_put(musb);
+
+err0:
+	return ret;
+}
+
+static int ux500_remove(struct platform_device *pdev)
+{
+	struct ux500_glue	*glue = platform_get_drvdata(pdev);
+
+	platform_device_unregister(glue->musb);
+	clk_disable_unprepare(glue->clk);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ux500_suspend(struct device *dev)
+{
+	struct ux500_glue	*glue = dev_get_drvdata(dev);
+	struct musb		*musb = glue_to_musb(glue);
+
+	if (musb)
+		usb_phy_set_suspend(musb->xceiv, 1);
+
+	clk_disable_unprepare(glue->clk);
+
+	return 0;
+}
+
+static int ux500_resume(struct device *dev)
+{
+	struct ux500_glue	*glue = dev_get_drvdata(dev);
+	struct musb		*musb = glue_to_musb(glue);
+	int			ret;
+
+	ret = clk_prepare_enable(glue->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable clock\n");
+		return ret;
+	}
+
+	if (musb)
+		usb_phy_set_suspend(musb->xceiv, 0);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
+
+static const struct of_device_id ux500_match[] = {
+        { .compatible = "stericsson,db8500-musb", },
+        {}
+};
+
+MODULE_DEVICE_TABLE(of, ux500_match);
+
+static struct platform_driver ux500_driver = {
+	.probe		= ux500_probe,
+	.remove		= ux500_remove,
+	.driver		= {
+		.name	= "musb-ux500",
+		.pm	= &ux500_pm_ops,
+		.of_match_table = ux500_match,
+	},
+};
+
+MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
+MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
+MODULE_LICENSE("GPL v2");
+module_platform_driver(ux500_driver);