1 files changed, 524 insertions, 0 deletions

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
new file mode 100644
index 000000000..1d435e4ee
--- /dev/null
+++ b/drivers/usb/musb/omap2430.c
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2005-2007 by Texas Instruments
+ * Some code has been taken from tusb6010.c
+ * Copyrights for that are attributable to:
+ * Copyright (C) 2006 Nokia Corporation
+ * Tony Lindgren <tony@atomide.com>
+ *
+ * This file is part of the Inventra Controller Driver for Linux.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/pm_runtime.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/usb/musb.h>
+#include <linux/phy/omap_control_phy.h>
+#include <linux/of_platform.h>
+
+#include "musb_core.h"
+#include "omap2430.h"
+
+struct omap2430_glue {
+	struct device		*dev;
+	struct platform_device	*musb;
+	enum musb_vbus_id_status status;
+	struct work_struct	omap_musb_mailbox_work;
+	struct device		*control_otghs;
+};
+#define glue_to_musb(g)		platform_get_drvdata(g->musb)
+
+static struct omap2430_glue	*_glue;
+
+static inline void omap2430_low_level_exit(struct musb *musb)
+{
+	u32 l;
+
+	/* in any role */
+	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
+	l |= ENABLEFORCE;	/* enable MSTANDBY */
+	musb_writel(musb->mregs, OTG_FORCESTDBY, l);
+}
+
+static inline void omap2430_low_level_init(struct musb *musb)
+{
+	u32 l;
+
+	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
+	l &= ~ENABLEFORCE;	/* disable MSTANDBY */
+	musb_writel(musb->mregs, OTG_FORCESTDBY, l);
+}
+
+static int omap2430_musb_mailbox(enum musb_vbus_id_status status)
+{
+	struct omap2430_glue	*glue = _glue;
+
+	if (!glue) {
+		pr_err("%s: musb core is not yet initialized\n", __func__);
+		return -EPROBE_DEFER;
+	}
+	glue->status = status;
+
+	if (!glue_to_musb(glue)) {
+		pr_err("%s: musb core is not yet ready\n", __func__);
+		return -EPROBE_DEFER;
+	}
+
+	schedule_work(&glue->omap_musb_mailbox_work);
+
+	return 0;
+}
+
+/*
+ * HDRC controls CPEN, but beware current surges during device connect.
+ * They can trigger transient overcurrent conditions that must be ignored.
+ *
+ * Note that we're skipping A_WAIT_VFALL -> A_IDLE and jumping right to B_IDLE
+ * as set by musb_set_peripheral().
+ */
+static void omap_musb_set_mailbox(struct omap2430_glue *glue)
+{
+	struct musb *musb = glue_to_musb(glue);
+	int error;
+
+	pm_runtime_get_sync(musb->controller);
+
+	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
+		usb_otg_state_string(musb->xceiv->otg->state),
+		musb_readb(musb->mregs, MUSB_DEVCTL));
+
+	switch (glue->status) {
+	case MUSB_ID_GROUND:
+		dev_dbg(musb->controller, "ID GND\n");
+		switch (musb->xceiv->otg->state) {
+		case OTG_STATE_A_IDLE:
+			error = musb_set_host(musb);
+			if (error)
+				break;
+			musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
+			fallthrough;
+		case OTG_STATE_A_WAIT_VRISE:
+		case OTG_STATE_A_WAIT_BCON:
+		case OTG_STATE_A_HOST:
+			/*
+			 * On multiple ID ground interrupts just keep enabling
+			 * VBUS. At least cpcap VBUS shuts down otherwise.
+			 */
+			otg_set_vbus(musb->xceiv->otg, 1);
+			break;
+		default:
+			musb->xceiv->otg->state = OTG_STATE_A_IDLE;
+			musb->xceiv->last_event = USB_EVENT_ID;
+			if (musb->gadget_driver) {
+				omap_control_usb_set_mode(glue->control_otghs,
+							  USB_MODE_HOST);
+				otg_set_vbus(musb->xceiv->otg, 1);
+			}
+			break;
+		}
+		break;
+
+	case MUSB_VBUS_VALID:
+		dev_dbg(musb->controller, "VBUS Connect\n");
+
+		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
+		musb->xceiv->last_event = USB_EVENT_VBUS;
+		omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
+		break;
+
+	case MUSB_ID_FLOAT:
+	case MUSB_VBUS_OFF:
+		dev_dbg(musb->controller, "VBUS Disconnect\n");
+
+		musb->xceiv->last_event = USB_EVENT_NONE;
+		musb_set_peripheral(musb);
+		otg_set_vbus(musb->xceiv->otg, 0);
+		omap_control_usb_set_mode(glue->control_otghs,
+			USB_MODE_DISCONNECT);
+		break;
+	default:
+		dev_dbg(musb->controller, "ID float\n");
+	}
+	pm_runtime_mark_last_busy(musb->controller);
+	pm_runtime_put_autosuspend(musb->controller);
+	atomic_notifier_call_chain(&musb->xceiv->notifier,
+			musb->xceiv->last_event, NULL);
+}
+
+
+static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
+{
+	struct omap2430_glue *glue = container_of(mailbox_work,
+				struct omap2430_glue, omap_musb_mailbox_work);
+
+	omap_musb_set_mailbox(glue);
+}
+
+static irqreturn_t omap2430_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 omap2430_musb_init(struct musb *musb)
+{
+	u32 l;
+	int status = 0;
+	struct device *dev = musb->controller;
+	struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
+	struct omap_musb_board_data *data = plat->board_data;
+
+	/* We require some kind of external transceiver, hooked
+	 * up through ULPI.  TWL4030-family PMICs include one,
+	 * which needs a driver, drivers aren't always needed.
+	 */
+	musb->phy = devm_phy_get(dev->parent, "usb2-phy");
+
+	/* We can't totally remove musb->xceiv as of now because
+	 * musb core uses xceiv.state and xceiv.otg. Once we have
+	 * a separate state machine to handle otg, these can be moved
+	 * out of xceiv and then we can start using the generic PHY
+	 * framework
+	 */
+	musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "usb-phy", 0);
+
+	if (IS_ERR(musb->xceiv)) {
+		status = PTR_ERR(musb->xceiv);
+
+		if (status == -ENXIO)
+			return status;
+
+		dev_dbg(dev, "HS USB OTG: no transceiver configured\n");
+		return -EPROBE_DEFER;
+	}
+
+	if (IS_ERR(musb->phy)) {
+		dev_err(dev, "HS USB OTG: no PHY configured\n");
+		return PTR_ERR(musb->phy);
+	}
+	musb->isr = omap2430_musb_interrupt;
+	phy_init(musb->phy);
+	phy_power_on(musb->phy);
+
+	l = musb_readl(musb->mregs, OTG_INTERFSEL);
+
+	if (data->interface_type == MUSB_INTERFACE_UTMI) {
+		/* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
+		l &= ~ULPI_12PIN;       /* Disable ULPI */
+		l |= UTMI_8BIT;         /* Enable UTMI  */
+	} else {
+		l |= ULPI_12PIN;
+	}
+
+	musb_writel(musb->mregs, OTG_INTERFSEL, l);
+
+	dev_dbg(dev, "HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
+			"sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
+			musb_readl(musb->mregs, OTG_REVISION),
+			musb_readl(musb->mregs, OTG_SYSCONFIG),
+			musb_readl(musb->mregs, OTG_SYSSTATUS),
+			musb_readl(musb->mregs, OTG_INTERFSEL),
+			musb_readl(musb->mregs, OTG_SIMENABLE));
+
+	return 0;
+}
+
+static void omap2430_musb_enable(struct musb *musb)
+{
+	struct device *dev = musb->controller;
+	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
+
+	if (glue->status == MUSB_UNKNOWN)
+		glue->status = MUSB_VBUS_OFF;
+	omap_musb_set_mailbox(glue);
+}
+
+static void omap2430_musb_disable(struct musb *musb)
+{
+	struct device *dev = musb->controller;
+	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
+
+	if (glue->status != MUSB_UNKNOWN)
+		omap_control_usb_set_mode(glue->control_otghs,
+			USB_MODE_DISCONNECT);
+}
+
+static int omap2430_musb_exit(struct musb *musb)
+{
+	struct device *dev = musb->controller;
+	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
+
+	omap2430_low_level_exit(musb);
+	phy_power_off(musb->phy);
+	phy_exit(musb->phy);
+	musb->phy = NULL;
+	cancel_work_sync(&glue->omap_musb_mailbox_work);
+
+	return 0;
+}
+
+static const struct musb_platform_ops omap2430_ops = {
+	.quirks		= MUSB_DMA_INVENTRA,
+#ifdef CONFIG_USB_INVENTRA_DMA
+	.dma_init	= musbhs_dma_controller_create,
+	.dma_exit	= musbhs_dma_controller_destroy,
+#endif
+	.init		= omap2430_musb_init,
+	.exit		= omap2430_musb_exit,
+
+	.enable		= omap2430_musb_enable,
+	.disable	= omap2430_musb_disable,
+
+	.phy_callback	= omap2430_musb_mailbox,
+};
+
+static u64 omap2430_dmamask = DMA_BIT_MASK(32);
+
+static int omap2430_probe(struct platform_device *pdev)
+{
+	struct resource			musb_resources[3];
+	struct musb_hdrc_platform_data	*pdata = dev_get_platdata(&pdev->dev);
+	struct omap_musb_board_data	*data;
+	struct platform_device		*musb;
+	struct omap2430_glue		*glue;
+	struct device_node		*np = pdev->dev.of_node;
+	struct musb_hdrc_config		*config;
+	struct device_node		*control_node;
+	struct platform_device		*control_pdev;
+	int				ret = -ENOMEM, val;
+
+	if (!np)
+		return -ENODEV;
+
+	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;
+	}
+
+	musb->dev.parent		= &pdev->dev;
+	musb->dev.dma_mask		= &omap2430_dmamask;
+	musb->dev.coherent_dma_mask	= omap2430_dmamask;
+
+	glue->dev			= &pdev->dev;
+	glue->musb			= musb;
+	glue->status			= MUSB_UNKNOWN;
+	glue->control_otghs = ERR_PTR(-ENODEV);
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		goto err2;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		goto err2;
+
+	config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
+	if (!config)
+		goto err2;
+
+	of_property_read_u32(np, "mode", (u32 *)&pdata->mode);
+	of_property_read_u32(np, "interface-type",
+			(u32 *)&data->interface_type);
+	of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
+	of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
+	of_property_read_u32(np, "power", (u32 *)&pdata->power);
+
+	ret = of_property_read_u32(np, "multipoint", &val);
+	if (!ret && val)
+		config->multipoint = true;
+
+	pdata->board_data	= data;
+	pdata->config		= config;
+
+	control_node = of_parse_phandle(np, "ctrl-module", 0);
+	if (control_node) {
+		control_pdev = of_find_device_by_node(control_node);
+		of_node_put(control_node);
+		if (!control_pdev) {
+			dev_err(&pdev->dev, "Failed to get control device\n");
+			ret = -EINVAL;
+			goto err2;
+		}
+		glue->control_otghs = &control_pdev->dev;
+	}
+
+	pdata->platform_ops		= &omap2430_ops;
+
+	platform_set_drvdata(pdev, glue);
+
+	/*
+	 * REVISIT if we ever have two instances of the wrapper, we will be
+	 * in big trouble
+	 */
+	_glue	= glue;
+
+	INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);
+
+	memset(musb_resources, 0x00, sizeof(*musb_resources) *
+			ARRAY_SIZE(musb_resources));
+
+	musb_resources[0].name = pdev->resource[0].name;
+	musb_resources[0].start = pdev->resource[0].start;
+	musb_resources[0].end = pdev->resource[0].end;
+	musb_resources[0].flags = pdev->resource[0].flags;
+
+	musb_resources[1].name = pdev->resource[1].name;
+	musb_resources[1].start = pdev->resource[1].start;
+	musb_resources[1].end = pdev->resource[1].end;
+	musb_resources[1].flags = pdev->resource[1].flags;
+
+	musb_resources[2].name = pdev->resource[2].name;
+	musb_resources[2].start = pdev->resource[2].start;
+	musb_resources[2].end = pdev->resource[2].end;
+	musb_resources[2].flags = pdev->resource[2].flags;
+
+	ret = platform_device_add_resources(musb, musb_resources,
+			ARRAY_SIZE(musb_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;
+	}
+
+	pm_runtime_enable(glue->dev);
+
+	ret = platform_device_add(musb);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register musb device\n");
+		goto err3;
+	}
+
+	return 0;
+
+err3:
+	pm_runtime_disable(glue->dev);
+
+err2:
+	platform_device_put(musb);
+
+err0:
+	return ret;
+}
+
+static int omap2430_remove(struct platform_device *pdev)
+{
+	struct omap2430_glue *glue = platform_get_drvdata(pdev);
+
+	platform_device_unregister(glue->musb);
+	pm_runtime_disable(glue->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int omap2430_runtime_suspend(struct device *dev)
+{
+	struct omap2430_glue		*glue = dev_get_drvdata(dev);
+	struct musb			*musb = glue_to_musb(glue);
+
+	if (!musb)
+		return 0;
+
+	musb->context.otg_interfsel = musb_readl(musb->mregs,
+						 OTG_INTERFSEL);
+
+	omap2430_low_level_exit(musb);
+
+	phy_power_off(musb->phy);
+	phy_exit(musb->phy);
+
+	return 0;
+}
+
+static int omap2430_runtime_resume(struct device *dev)
+{
+	struct omap2430_glue		*glue = dev_get_drvdata(dev);
+	struct musb			*musb = glue_to_musb(glue);
+
+	if (!musb)
+		return 0;
+
+	phy_init(musb->phy);
+	phy_power_on(musb->phy);
+
+	omap2430_low_level_init(musb);
+	musb_writel(musb->mregs, OTG_INTERFSEL,
+		    musb->context.otg_interfsel);
+
+	/* Wait for musb to get oriented. Otherwise we can get babble */
+	usleep_range(200000, 250000);
+
+	return 0;
+}
+
+static const struct dev_pm_ops omap2430_pm_ops = {
+	.runtime_suspend = omap2430_runtime_suspend,
+	.runtime_resume = omap2430_runtime_resume,
+};
+
+#define DEV_PM_OPS	(&omap2430_pm_ops)
+#else
+#define DEV_PM_OPS	NULL
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id omap2430_id_table[] = {
+	{
+		.compatible = "ti,omap4-musb"
+	},
+	{
+		.compatible = "ti,omap3-musb"
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap2430_id_table);
+#endif
+
+static struct platform_driver omap2430_driver = {
+	.probe		= omap2430_probe,
+	.remove		= omap2430_remove,
+	.driver		= {
+		.name	= "musb-omap2430",
+		.pm	= DEV_PM_OPS,
+		.of_match_table = of_match_ptr(omap2430_id_table),
+	},
+};
+
+module_platform_driver(omap2430_driver);
+
+MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
+MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
+MODULE_LICENSE("GPL v2");