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150 lines
3.7 KiB
150 lines
3.7 KiB
// 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 (!extcon) |
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return -EPROBE_DEFER; |
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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 <[email protected]>");
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