556 lines
13 KiB
C
556 lines
13 KiB
C
/*
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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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* The Inventra Controller Driver for Linux is free software; you
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* can redistribute it and/or modify it under the terms of the GNU
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* General Public License version 2 as published by the Free Software
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* Foundation.
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*
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* The Inventra Controller Driver for Linux is distributed in
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* the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with The Inventra Controller Driver for Linux ; if not,
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* write to the Free Software Foundation, Inc., 59 Temple Place,
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* Suite 330, Boston, MA 02111-1307 USA
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*
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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/clk.h>
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#include <linux/io.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 "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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};
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#define glue_to_musb(g) platform_get_drvdata(g->musb)
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static struct timer_list musb_idle_timer;
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static void musb_do_idle(unsigned long _musb)
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{
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struct musb *musb = (void *)_musb;
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unsigned long flags;
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#ifdef CONFIG_USB_MUSB_HDRC_HCD
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u8 power;
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#endif
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u8 devctl;
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spin_lock_irqsave(&musb->lock, flags);
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switch (musb->xceiv->state) {
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case OTG_STATE_A_WAIT_BCON:
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devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
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if (devctl & MUSB_DEVCTL_BDEVICE) {
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musb->xceiv->state = OTG_STATE_B_IDLE;
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MUSB_DEV_MODE(musb);
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} else {
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musb->xceiv->state = OTG_STATE_A_IDLE;
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MUSB_HST_MODE(musb);
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}
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break;
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#ifdef CONFIG_USB_MUSB_HDRC_HCD
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case OTG_STATE_A_SUSPEND:
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/* finish RESUME signaling? */
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if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
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power = musb_readb(musb->mregs, MUSB_POWER);
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power &= ~MUSB_POWER_RESUME;
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DBG(1, "root port resume stopped, power %02x\n", power);
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musb_writeb(musb->mregs, MUSB_POWER, power);
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musb->is_active = 1;
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musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
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| MUSB_PORT_STAT_RESUME);
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musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
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usb_hcd_poll_rh_status(musb_to_hcd(musb));
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/* NOTE: it might really be A_WAIT_BCON ... */
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musb->xceiv->state = OTG_STATE_A_HOST;
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}
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break;
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#endif
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#ifdef CONFIG_USB_MUSB_HDRC_HCD
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case OTG_STATE_A_HOST:
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devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
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if (devctl & MUSB_DEVCTL_BDEVICE)
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musb->xceiv->state = OTG_STATE_B_IDLE;
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else
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musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
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#endif
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default:
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break;
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}
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spin_unlock_irqrestore(&musb->lock, flags);
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}
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static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
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{
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unsigned long default_timeout = jiffies + msecs_to_jiffies(3);
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static unsigned long last_timer;
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if (timeout == 0)
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timeout = default_timeout;
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/* Never idle if active, or when VBUS timeout is not set as host */
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if (musb->is_active || ((musb->a_wait_bcon == 0)
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&& (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
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DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
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del_timer(&musb_idle_timer);
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last_timer = jiffies;
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return;
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}
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if (time_after(last_timer, timeout)) {
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if (!timer_pending(&musb_idle_timer))
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last_timer = timeout;
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else {
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DBG(4, "Longer idle timer already pending, ignoring\n");
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return;
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}
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}
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last_timer = timeout;
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DBG(4, "%s inactive, for idle timer for %lu ms\n",
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otg_state_string(musb),
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(unsigned long)jiffies_to_msecs(timeout - jiffies));
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mod_timer(&musb_idle_timer, timeout);
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}
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static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
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{
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u8 devctl;
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unsigned long timeout = jiffies + msecs_to_jiffies(1000);
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int ret = 1;
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/* HDRC controls CPEN, but beware current surges during device
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* connect. They can trigger transient overcurrent conditions
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* that must be ignored.
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*/
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devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
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if (is_on) {
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if (musb->xceiv->state == OTG_STATE_A_IDLE) {
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/* start the session */
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devctl |= MUSB_DEVCTL_SESSION;
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
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/*
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* Wait for the musb to set as A device to enable the
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* VBUS
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*/
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while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
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cpu_relax();
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if (time_after(jiffies, timeout)) {
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dev_err(musb->controller,
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"configured as A device timeout");
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ret = -EINVAL;
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break;
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}
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}
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if (ret && musb->xceiv->set_vbus)
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otg_set_vbus(musb->xceiv, 1);
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} else {
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musb->is_active = 1;
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musb->xceiv->default_a = 1;
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musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
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devctl |= MUSB_DEVCTL_SESSION;
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MUSB_HST_MODE(musb);
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}
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} else {
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musb->is_active = 0;
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/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
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* jumping right to B_IDLE...
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*/
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musb->xceiv->default_a = 0;
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musb->xceiv->state = OTG_STATE_B_IDLE;
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devctl &= ~MUSB_DEVCTL_SESSION;
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MUSB_DEV_MODE(musb);
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}
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
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DBG(1, "VBUS %s, devctl %02x "
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/* otg %3x conf %08x prcm %08x */ "\n",
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otg_state_string(musb),
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musb_readb(musb->mregs, MUSB_DEVCTL));
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}
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static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
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{
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u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
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devctl |= MUSB_DEVCTL_SESSION;
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
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return 0;
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}
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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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/* blocking notifier support */
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static int musb_otg_notifications(struct notifier_block *nb,
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unsigned long event, void *unused)
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{
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struct musb *musb = container_of(nb, struct musb, nb);
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struct device *dev = musb->controller;
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struct musb_hdrc_platform_data *pdata = dev->platform_data;
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struct omap_musb_board_data *data = pdata->board_data;
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switch (event) {
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case USB_EVENT_ID:
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DBG(4, "ID GND\n");
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if (is_otg_enabled(musb)) {
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#ifdef CONFIG_USB_GADGET_MUSB_HDRC
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if (musb->gadget_driver) {
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pm_runtime_get_sync(musb->controller);
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otg_init(musb->xceiv);
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omap2430_musb_set_vbus(musb, 1);
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}
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#endif
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} else {
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pm_runtime_get_sync(musb->controller);
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otg_init(musb->xceiv);
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omap2430_musb_set_vbus(musb, 1);
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}
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break;
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case USB_EVENT_VBUS:
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DBG(4, "VBUS Connect\n");
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#ifdef CONFIG_USB_GADGET_MUSB_HDRC
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if (musb->gadget_driver)
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pm_runtime_get_sync(musb->controller);
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#endif
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otg_init(musb->xceiv);
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break;
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case USB_EVENT_NONE:
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DBG(4, "VBUS Disconnect\n");
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#ifdef CONFIG_USB_GADGET_MUSB_HDRC
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if (is_otg_enabled(musb))
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if (musb->gadget_driver)
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#endif
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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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}
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if (data->interface_type == MUSB_INTERFACE_UTMI) {
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if (musb->xceiv->set_vbus)
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otg_set_vbus(musb->xceiv, 0);
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}
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otg_shutdown(musb->xceiv);
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break;
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default:
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DBG(4, "ID float\n");
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return NOTIFY_DONE;
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}
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return NOTIFY_OK;
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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, status = 0;
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struct device *dev = musb->controller;
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struct musb_hdrc_platform_data *plat = dev->platform_data;
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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->xceiv = otg_get_transceiver();
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if (!musb->xceiv) {
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pr_err("HS USB OTG: no transceiver configured\n");
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return -ENODEV;
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}
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status = pm_runtime_get_sync(dev);
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if (status < 0) {
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dev_err(dev, "pm_runtime_get_sync FAILED");
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goto err1;
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}
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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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pr_debug("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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musb->nb.notifier_call = musb_otg_notifications;
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status = otg_register_notifier(musb->xceiv, &musb->nb);
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if (status)
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DBG(1, "notification register failed\n");
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setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
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return 0;
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err1:
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pm_runtime_disable(dev);
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return status;
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}
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static void omap2430_musb_enable(struct musb *musb)
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{
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u8 devctl;
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unsigned long timeout = jiffies + msecs_to_jiffies(1000);
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struct device *dev = musb->controller;
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struct musb_hdrc_platform_data *pdata = dev->platform_data;
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struct omap_musb_board_data *data = pdata->board_data;
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switch (musb->xceiv->last_event) {
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case USB_EVENT_ID:
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otg_init(musb->xceiv);
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if (data->interface_type == MUSB_INTERFACE_UTMI) {
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devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
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/* start the session */
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devctl |= MUSB_DEVCTL_SESSION;
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
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while (musb_readb(musb->mregs, MUSB_DEVCTL) &
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MUSB_DEVCTL_BDEVICE) {
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cpu_relax();
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if (time_after(jiffies, timeout)) {
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dev_err(musb->controller,
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"configured as A device timeout");
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break;
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}
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}
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}
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break;
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case USB_EVENT_VBUS:
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otg_init(musb->xceiv);
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break;
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default:
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break;
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}
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}
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static void omap2430_musb_disable(struct musb *musb)
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{
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if (musb->xceiv->last_event)
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otg_shutdown(musb->xceiv);
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}
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static int omap2430_musb_exit(struct musb *musb)
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{
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del_timer_sync(&musb_idle_timer);
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omap2430_low_level_exit(musb);
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otg_put_transceiver(musb->xceiv);
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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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.init = omap2430_musb_init,
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.exit = omap2430_musb_exit,
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.set_mode = omap2430_musb_set_mode,
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.try_idle = omap2430_musb_try_idle,
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.set_vbus = omap2430_musb_set_vbus,
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.enable = omap2430_musb_enable,
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.disable = omap2430_musb_disable,
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};
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static u64 omap2430_dmamask = DMA_BIT_MASK(32);
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static int __init omap2430_probe(struct platform_device *pdev)
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{
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struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
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struct platform_device *musb;
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struct omap2430_glue *glue;
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int ret = -ENOMEM;
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glue = kzalloc(sizeof(*glue), GFP_KERNEL);
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if (!glue) {
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dev_err(&pdev->dev, "failed to allocate glue context\n");
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goto err0;
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}
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musb = platform_device_alloc("musb-hdrc", -1);
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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 err1;
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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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pdata->platform_ops = &omap2430_ops;
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platform_set_drvdata(pdev, glue);
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ret = platform_device_add_resources(musb, pdev->resource,
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pdev->num_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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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 err2;
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}
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pm_runtime_enable(&pdev->dev);
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return 0;
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err2:
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platform_device_put(musb);
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err1:
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kfree(glue);
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err0:
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return ret;
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}
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static int __exit 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_del(glue->musb);
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platform_device_put(glue->musb);
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pm_runtime_put(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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kfree(glue);
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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);
|
|
struct musb *musb = glue_to_musb(glue);
|
|
|
|
omap2430_low_level_exit(musb);
|
|
otg_set_suspend(musb->xceiv, 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);
|
|
|
|
omap2430_low_level_init(musb);
|
|
otg_set_suspend(musb->xceiv, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static 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
|
|
|
|
static struct platform_driver omap2430_driver = {
|
|
.remove = __exit_p(omap2430_remove),
|
|
.driver = {
|
|
.name = "musb-omap2430",
|
|
.pm = DEV_PM_OPS,
|
|
},
|
|
};
|
|
|
|
MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
|
|
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
static int __init omap2430_init(void)
|
|
{
|
|
return platform_driver_probe(&omap2430_driver, omap2430_probe);
|
|
}
|
|
subsys_initcall(omap2430_init);
|
|
|
|
static void __exit omap2430_exit(void)
|
|
{
|
|
platform_driver_unregister(&omap2430_driver);
|
|
}
|
|
module_exit(omap2430_exit);
|