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path: root/drivers/usb/musb/omap2430.c
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Diffstat (limited to 'drivers/usb/musb/omap2430.c')
-rw-r--r--drivers/usb/musb/omap2430.c625
1 files changed, 625 insertions, 0 deletions
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
new file mode 100644
index 000000000..44a21ec86
--- /dev/null
+++ b/drivers/usb/musb/omap2430.c
@@ -0,0 +1,625 @@
+// 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/of_irq.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;
+ unsigned int is_runtime_suspended:1;
+ unsigned int needs_resume:1;
+ unsigned int phy_suspended:1;
+};
+#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 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;
+ bool populate_irqs = false;
+
+ 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;
+
+ /*
+ * Legacy SoCs using omap_device get confused if node is moved
+ * because of interconnect properties mixed into the node.
+ */
+ if (of_get_property(np, "ti,hwmods", NULL)) {
+ dev_warn(&pdev->dev, "please update to probe with ti-sysc\n");
+ populate_irqs = true;
+ } else {
+ device_set_of_node_from_dev(&musb->dev, &pdev->dev);
+ }
+ of_node_put(np);
+
+ 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);
+
+ ret = platform_device_add_resources(musb, pdev->resource, pdev->num_resources);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add resources\n");
+ goto err2;
+ }
+
+ if (populate_irqs) {
+ struct resource musb_res[3];
+ struct resource *res;
+ int i = 0;
+
+ memset(musb_res, 0, sizeof(*musb_res) * ARRAY_SIZE(musb_res));
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ ret = -EINVAL;
+ goto err2;
+ }
+
+ musb_res[i].start = res->start;
+ musb_res[i].end = res->end;
+ musb_res[i].flags = res->flags;
+ musb_res[i].name = res->name;
+ i++;
+
+ ret = of_irq_get_byname(np, "mc");
+ if (ret > 0) {
+ musb_res[i].start = ret;
+ musb_res[i].flags = IORESOURCE_IRQ;
+ musb_res[i].name = "mc";
+ i++;
+ }
+
+ ret = of_irq_get_byname(np, "dma");
+ if (ret > 0) {
+ musb_res[i].start = ret;
+ musb_res[i].flags = IORESOURCE_IRQ;
+ musb_res[i].name = "dma";
+ i++;
+ }
+
+ ret = platform_device_add_resources(musb, musb_res, i);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add IRQ 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);
+
+ if (!glue->phy_suspended) {
+ phy_power_off(musb->phy);
+ phy_exit(musb->phy);
+ }
+
+ glue->is_runtime_suspended = 1;
+
+ 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;
+
+ if (!glue->phy_suspended) {
+ 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);
+
+ glue->is_runtime_suspended = 0;
+
+ return 0;
+}
+
+/* I2C and SPI PHYs need to be suspended before the glue layer */
+static int omap2430_suspend(struct device *dev)
+{
+ struct omap2430_glue *glue = dev_get_drvdata(dev);
+ struct musb *musb = glue_to_musb(glue);
+
+ phy_power_off(musb->phy);
+ phy_exit(musb->phy);
+ glue->phy_suspended = 1;
+
+ return 0;
+}
+
+/* Glue layer needs to be suspended after musb_suspend() */
+static int omap2430_suspend_late(struct device *dev)
+{
+ struct omap2430_glue *glue = dev_get_drvdata(dev);
+
+ if (glue->is_runtime_suspended)
+ return 0;
+
+ glue->needs_resume = 1;
+
+ return omap2430_runtime_suspend(dev);
+}
+
+static int omap2430_resume_early(struct device *dev)
+{
+ struct omap2430_glue *glue = dev_get_drvdata(dev);
+
+ if (!glue->needs_resume)
+ return 0;
+
+ glue->needs_resume = 0;
+
+ return omap2430_runtime_resume(dev);
+}
+
+static int omap2430_resume(struct device *dev)
+{
+ struct omap2430_glue *glue = dev_get_drvdata(dev);
+ struct musb *musb = glue_to_musb(glue);
+
+ phy_init(musb->phy);
+ phy_power_on(musb->phy);
+ glue->phy_suspended = 0;
+
+ return 0;
+}
+
+static const struct dev_pm_ops omap2430_pm_ops = {
+ .runtime_suspend = omap2430_runtime_suspend,
+ .runtime_resume = omap2430_runtime_resume,
+ .suspend = omap2430_suspend,
+ .suspend_late = omap2430_suspend_late,
+ .resume_early = omap2430_resume_early,
+ .resume = omap2430_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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 16:00:10 +0000