151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* OMAP OTG controller driver
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*
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* Based on code from tahvo-usb.c and isp1301_omap.c drivers.
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*
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* Copyright (C) 2005-2006 Nokia Corporation
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* Copyright (C) 2004 Texas Instruments
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* Copyright (C) 2004 David Brownell
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*/
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/extcon.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/usb-omap1.h>
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struct otg_device {
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void __iomem *base;
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bool id;
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bool vbus;
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struct extcon_dev *extcon;
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struct notifier_block vbus_nb;
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struct notifier_block id_nb;
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};
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#define OMAP_OTG_CTRL 0x0c
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#define OMAP_OTG_ASESSVLD (1 << 20)
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#define OMAP_OTG_BSESSEND (1 << 19)
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#define OMAP_OTG_BSESSVLD (1 << 18)
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#define OMAP_OTG_VBUSVLD (1 << 17)
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#define OMAP_OTG_ID (1 << 16)
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#define OMAP_OTG_XCEIV_OUTPUTS \
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(OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
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OMAP_OTG_VBUSVLD | OMAP_OTG_ID)
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static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
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{
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u32 l;
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l = readl(otg_dev->base + OMAP_OTG_CTRL);
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l &= ~OMAP_OTG_XCEIV_OUTPUTS;
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l |= outputs;
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writel(l, otg_dev->base + OMAP_OTG_CTRL);
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}
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static void omap_otg_set_mode(struct otg_device *otg_dev)
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{
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if (!otg_dev->id && otg_dev->vbus)
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/* Set B-session valid. */
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omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
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else if (otg_dev->vbus)
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/* Set A-session valid. */
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omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
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else if (!otg_dev->id)
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/* Set B-session end to indicate no VBUS. */
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omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
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}
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static int omap_otg_id_notifier(struct notifier_block *nb,
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unsigned long event, void *ptr)
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{
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struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
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otg_dev->id = event;
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omap_otg_set_mode(otg_dev);
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return NOTIFY_DONE;
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}
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static int omap_otg_vbus_notifier(struct notifier_block *nb,
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unsigned long event, void *ptr)
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{
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struct otg_device *otg_dev = container_of(nb, struct otg_device,
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vbus_nb);
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otg_dev->vbus = event;
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omap_otg_set_mode(otg_dev);
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return NOTIFY_DONE;
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}
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static int omap_otg_probe(struct platform_device *pdev)
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{
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const struct omap_usb_config *config = pdev->dev.platform_data;
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struct otg_device *otg_dev;
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struct extcon_dev *extcon;
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int ret;
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u32 rev;
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if (!config || !config->extcon)
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return -ENODEV;
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extcon = extcon_get_extcon_dev(config->extcon);
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if (IS_ERR(extcon))
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return PTR_ERR(extcon);
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otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
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if (!otg_dev)
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return -ENOMEM;
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otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
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if (IS_ERR(otg_dev->base))
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return PTR_ERR(otg_dev->base);
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otg_dev->extcon = extcon;
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otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
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otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
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ret = devm_extcon_register_notifier(&pdev->dev, extcon,
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EXTCON_USB_HOST, &otg_dev->id_nb);
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if (ret)
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return ret;
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ret = devm_extcon_register_notifier(&pdev->dev, extcon,
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EXTCON_USB, &otg_dev->vbus_nb);
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if (ret) {
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return ret;
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}
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otg_dev->id = extcon_get_state(extcon, EXTCON_USB_HOST);
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otg_dev->vbus = extcon_get_state(extcon, EXTCON_USB);
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omap_otg_set_mode(otg_dev);
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rev = readl(otg_dev->base);
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dev_info(&pdev->dev,
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"OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
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(rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
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otg_dev->vbus);
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platform_set_drvdata(pdev, otg_dev);
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return 0;
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}
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static struct platform_driver omap_otg_driver = {
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.probe = omap_otg_probe,
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.driver = {
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.name = "omap_otg",
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},
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};
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module_platform_driver(omap_otg_driver);
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MODULE_DESCRIPTION("OMAP USB OTG controller driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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