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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
523 lines
13 KiB
C
523 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2005-2007 by Texas Instruments
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* Some code has been taken from tusb6010.c
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* Copyrights for that are attributable to:
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* Copyright (C) 2006 Nokia Corporation
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* Tony Lindgren <tony@atomide.com>
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*
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* This file is part of the Inventra Controller Driver for Linux.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/pm_runtime.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/usb/musb.h>
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#include <linux/phy/omap_control_phy.h>
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#include <linux/of_platform.h>
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#include "musb_core.h"
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#include "omap2430.h"
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struct omap2430_glue {
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struct device *dev;
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struct platform_device *musb;
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enum musb_vbus_id_status status;
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struct work_struct omap_musb_mailbox_work;
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struct device *control_otghs;
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};
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#define glue_to_musb(g) platform_get_drvdata(g->musb)
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static struct omap2430_glue *_glue;
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static inline void omap2430_low_level_exit(struct musb *musb)
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{
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u32 l;
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/* in any role */
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l = musb_readl(musb->mregs, OTG_FORCESTDBY);
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l |= ENABLEFORCE; /* enable MSTANDBY */
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musb_writel(musb->mregs, OTG_FORCESTDBY, l);
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}
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static inline void omap2430_low_level_init(struct musb *musb)
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{
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u32 l;
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l = musb_readl(musb->mregs, OTG_FORCESTDBY);
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l &= ~ENABLEFORCE; /* disable MSTANDBY */
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musb_writel(musb->mregs, OTG_FORCESTDBY, l);
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}
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static int omap2430_musb_mailbox(enum musb_vbus_id_status status)
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{
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struct omap2430_glue *glue = _glue;
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if (!glue) {
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pr_err("%s: musb core is not yet initialized\n", __func__);
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return -EPROBE_DEFER;
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}
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glue->status = status;
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if (!glue_to_musb(glue)) {
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pr_err("%s: musb core is not yet ready\n", __func__);
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return -EPROBE_DEFER;
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}
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schedule_work(&glue->omap_musb_mailbox_work);
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return 0;
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}
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/*
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* HDRC controls CPEN, but beware current surges during device connect.
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* They can trigger transient overcurrent conditions that must be ignored.
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*
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* Note that we're skipping A_WAIT_VFALL -> A_IDLE and jumping right to B_IDLE
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* as set by musb_set_peripheral().
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*/
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static void omap_musb_set_mailbox(struct omap2430_glue *glue)
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{
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struct musb *musb = glue_to_musb(glue);
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int error;
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pm_runtime_get_sync(musb->controller);
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dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
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usb_otg_state_string(musb->xceiv->otg->state),
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musb_readb(musb->mregs, MUSB_DEVCTL));
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switch (glue->status) {
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case MUSB_ID_GROUND:
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dev_dbg(musb->controller, "ID GND\n");
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switch (musb->xceiv->otg->state) {
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case OTG_STATE_A_IDLE:
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error = musb_set_host(musb);
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if (error)
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break;
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musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
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fallthrough;
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case OTG_STATE_A_WAIT_VRISE:
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case OTG_STATE_A_WAIT_BCON:
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case OTG_STATE_A_HOST:
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/*
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* On multiple ID ground interrupts just keep enabling
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* VBUS. At least cpcap VBUS shuts down otherwise.
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*/
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otg_set_vbus(musb->xceiv->otg, 1);
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break;
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default:
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musb->xceiv->otg->state = OTG_STATE_A_IDLE;
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musb->xceiv->last_event = USB_EVENT_ID;
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if (musb->gadget_driver) {
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omap_control_usb_set_mode(glue->control_otghs,
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USB_MODE_HOST);
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otg_set_vbus(musb->xceiv->otg, 1);
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}
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break;
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}
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break;
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case MUSB_VBUS_VALID:
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dev_dbg(musb->controller, "VBUS Connect\n");
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musb->xceiv->otg->state = OTG_STATE_B_IDLE;
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musb->xceiv->last_event = USB_EVENT_VBUS;
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omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
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break;
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case MUSB_ID_FLOAT:
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case MUSB_VBUS_OFF:
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dev_dbg(musb->controller, "VBUS Disconnect\n");
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musb->xceiv->last_event = USB_EVENT_NONE;
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musb_set_peripheral(musb);
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otg_set_vbus(musb->xceiv->otg, 0);
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omap_control_usb_set_mode(glue->control_otghs,
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USB_MODE_DISCONNECT);
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break;
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default:
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dev_dbg(musb->controller, "ID float\n");
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}
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pm_runtime_mark_last_busy(musb->controller);
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pm_runtime_put_autosuspend(musb->controller);
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atomic_notifier_call_chain(&musb->xceiv->notifier,
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musb->xceiv->last_event, NULL);
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}
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static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
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{
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struct omap2430_glue *glue = container_of(mailbox_work,
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struct omap2430_glue, omap_musb_mailbox_work);
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omap_musb_set_mailbox(glue);
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}
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static irqreturn_t omap2430_musb_interrupt(int irq, void *__hci)
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{
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unsigned long flags;
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irqreturn_t retval = IRQ_NONE;
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struct musb *musb = __hci;
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spin_lock_irqsave(&musb->lock, flags);
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musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
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musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
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musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
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if (musb->int_usb || musb->int_tx || musb->int_rx)
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retval = musb_interrupt(musb);
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spin_unlock_irqrestore(&musb->lock, flags);
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return retval;
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}
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static int omap2430_musb_init(struct musb *musb)
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{
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u32 l;
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int status = 0;
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struct device *dev = musb->controller;
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struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
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struct omap_musb_board_data *data = plat->board_data;
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/* We require some kind of external transceiver, hooked
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* up through ULPI. TWL4030-family PMICs include one,
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* which needs a driver, drivers aren't always needed.
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*/
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musb->phy = devm_phy_get(dev->parent, "usb2-phy");
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/* We can't totally remove musb->xceiv as of now because
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* musb core uses xceiv.state and xceiv.otg. Once we have
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* a separate state machine to handle otg, these can be moved
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* out of xceiv and then we can start using the generic PHY
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* framework
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*/
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musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "usb-phy", 0);
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if (IS_ERR(musb->xceiv)) {
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status = PTR_ERR(musb->xceiv);
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if (status == -ENXIO)
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return status;
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dev_dbg(dev, "HS USB OTG: no transceiver configured\n");
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return -EPROBE_DEFER;
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}
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if (IS_ERR(musb->phy)) {
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dev_err(dev, "HS USB OTG: no PHY configured\n");
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return PTR_ERR(musb->phy);
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}
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musb->isr = omap2430_musb_interrupt;
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phy_init(musb->phy);
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phy_power_on(musb->phy);
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l = musb_readl(musb->mregs, OTG_INTERFSEL);
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if (data->interface_type == MUSB_INTERFACE_UTMI) {
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/* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
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l &= ~ULPI_12PIN; /* Disable ULPI */
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l |= UTMI_8BIT; /* Enable UTMI */
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} else {
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l |= ULPI_12PIN;
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}
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musb_writel(musb->mregs, OTG_INTERFSEL, l);
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dev_dbg(dev, "HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
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"sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n",
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musb_readl(musb->mregs, OTG_REVISION),
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musb_readl(musb->mregs, OTG_SYSCONFIG),
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musb_readl(musb->mregs, OTG_SYSSTATUS),
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musb_readl(musb->mregs, OTG_INTERFSEL),
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musb_readl(musb->mregs, OTG_SIMENABLE));
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return 0;
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}
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static void omap2430_musb_enable(struct musb *musb)
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{
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struct device *dev = musb->controller;
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struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
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if (glue->status == MUSB_UNKNOWN)
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glue->status = MUSB_VBUS_OFF;
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omap_musb_set_mailbox(glue);
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}
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static void omap2430_musb_disable(struct musb *musb)
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{
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struct device *dev = musb->controller;
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struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
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if (glue->status != MUSB_UNKNOWN)
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omap_control_usb_set_mode(glue->control_otghs,
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USB_MODE_DISCONNECT);
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}
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static int omap2430_musb_exit(struct musb *musb)
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{
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struct device *dev = musb->controller;
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struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
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omap2430_low_level_exit(musb);
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phy_power_off(musb->phy);
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phy_exit(musb->phy);
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musb->phy = NULL;
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cancel_work_sync(&glue->omap_musb_mailbox_work);
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return 0;
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}
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static const struct musb_platform_ops omap2430_ops = {
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.quirks = MUSB_DMA_INVENTRA,
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#ifdef CONFIG_USB_INVENTRA_DMA
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.dma_init = musbhs_dma_controller_create,
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.dma_exit = musbhs_dma_controller_destroy,
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#endif
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.init = omap2430_musb_init,
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.exit = omap2430_musb_exit,
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.enable = omap2430_musb_enable,
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.disable = omap2430_musb_disable,
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.phy_callback = omap2430_musb_mailbox,
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};
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static u64 omap2430_dmamask = DMA_BIT_MASK(32);
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static int omap2430_probe(struct platform_device *pdev)
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{
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struct resource musb_resources[3];
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struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct omap_musb_board_data *data;
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struct platform_device *musb;
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struct omap2430_glue *glue;
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struct device_node *np = pdev->dev.of_node;
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struct musb_hdrc_config *config;
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struct device_node *control_node;
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struct platform_device *control_pdev;
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int ret = -ENOMEM, val;
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if (!np)
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return -ENODEV;
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glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
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if (!glue)
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goto err0;
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musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
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if (!musb) {
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dev_err(&pdev->dev, "failed to allocate musb device\n");
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goto err0;
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}
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musb->dev.parent = &pdev->dev;
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musb->dev.dma_mask = &omap2430_dmamask;
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musb->dev.coherent_dma_mask = omap2430_dmamask;
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glue->dev = &pdev->dev;
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glue->musb = musb;
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glue->status = MUSB_UNKNOWN;
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glue->control_otghs = ERR_PTR(-ENODEV);
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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goto err2;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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goto err2;
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config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
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if (!config)
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goto err2;
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of_property_read_u32(np, "mode", (u32 *)&pdata->mode);
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of_property_read_u32(np, "interface-type",
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(u32 *)&data->interface_type);
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of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
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of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
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of_property_read_u32(np, "power", (u32 *)&pdata->power);
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ret = of_property_read_u32(np, "multipoint", &val);
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if (!ret && val)
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config->multipoint = true;
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pdata->board_data = data;
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pdata->config = config;
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control_node = of_parse_phandle(np, "ctrl-module", 0);
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if (control_node) {
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control_pdev = of_find_device_by_node(control_node);
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if (!control_pdev) {
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dev_err(&pdev->dev, "Failed to get control device\n");
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ret = -EINVAL;
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goto err2;
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}
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glue->control_otghs = &control_pdev->dev;
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}
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pdata->platform_ops = &omap2430_ops;
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platform_set_drvdata(pdev, glue);
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/*
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* REVISIT if we ever have two instances of the wrapper, we will be
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* in big trouble
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*/
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_glue = glue;
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INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);
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memset(musb_resources, 0x00, sizeof(*musb_resources) *
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ARRAY_SIZE(musb_resources));
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musb_resources[0].name = pdev->resource[0].name;
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musb_resources[0].start = pdev->resource[0].start;
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musb_resources[0].end = pdev->resource[0].end;
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musb_resources[0].flags = pdev->resource[0].flags;
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musb_resources[1].name = pdev->resource[1].name;
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musb_resources[1].start = pdev->resource[1].start;
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musb_resources[1].end = pdev->resource[1].end;
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musb_resources[1].flags = pdev->resource[1].flags;
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musb_resources[2].name = pdev->resource[2].name;
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musb_resources[2].start = pdev->resource[2].start;
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musb_resources[2].end = pdev->resource[2].end;
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musb_resources[2].flags = pdev->resource[2].flags;
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ret = platform_device_add_resources(musb, musb_resources,
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ARRAY_SIZE(musb_resources));
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if (ret) {
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dev_err(&pdev->dev, "failed to add resources\n");
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goto err2;
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}
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ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
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if (ret) {
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dev_err(&pdev->dev, "failed to add platform_data\n");
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goto err2;
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}
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pm_runtime_enable(glue->dev);
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ret = platform_device_add(musb);
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if (ret) {
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dev_err(&pdev->dev, "failed to register musb device\n");
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goto err3;
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}
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return 0;
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err3:
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pm_runtime_disable(glue->dev);
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err2:
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platform_device_put(musb);
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err0:
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return ret;
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}
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static int omap2430_remove(struct platform_device *pdev)
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{
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struct omap2430_glue *glue = platform_get_drvdata(pdev);
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platform_device_unregister(glue->musb);
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pm_runtime_disable(glue->dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int omap2430_runtime_suspend(struct device *dev)
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{
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struct omap2430_glue *glue = dev_get_drvdata(dev);
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struct musb *musb = glue_to_musb(glue);
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if (!musb)
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return 0;
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musb->context.otg_interfsel = musb_readl(musb->mregs,
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OTG_INTERFSEL);
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omap2430_low_level_exit(musb);
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phy_power_off(musb->phy);
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phy_exit(musb->phy);
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return 0;
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}
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static int omap2430_runtime_resume(struct device *dev)
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{
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struct omap2430_glue *glue = dev_get_drvdata(dev);
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struct musb *musb = glue_to_musb(glue);
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if (!musb)
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return 0;
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phy_init(musb->phy);
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phy_power_on(musb->phy);
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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");
|