linux/drivers/usb/musb/musb_dsps.c

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/*
* Texas Instruments DSPS platforms "glue layer"
*
* Copyright (C) 2012, by Texas Instruments
*
* Based on the am35x "glue layer" code.
*
* This file is part of the Inventra Controller Driver for Linux.
*
* The Inventra Controller Driver for Linux is free software; you
* can redistribute it and/or modify it under the terms of the GNU
* General Public License version 2 as published by the Free Software
* Foundation.
*
* The Inventra Controller Driver for Linux is distributed in
* the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with The Inventra Controller Driver for Linux ; if not,
* write to the Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*
* musb_dsps.c will be a common file for all the TI DSPS platforms
* such as dm64x, dm36x, dm35x, da8x, am35x and ti81x.
* For now only ti81x is using this and in future davinci.c, am35x.c
* da8xx.c would be merged to this file after testing.
*/
#include <linux/io.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/platform_data/usb-omap.h>
#include <linux/sizes.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
2013-07-05 12:51:33 +00:00
#include <linux/of_irq.h>
#include <linux/usb/of.h>
#include <linux/debugfs.h>
#include "musb_core.h"
static const struct of_device_id musb_dsps_of_match[];
/**
* DSPS musb wrapper register offset.
* FIXME: This should be expanded to have all the wrapper registers from TI DSPS
* musb ips.
*/
struct dsps_musb_wrapper {
u16 revision;
u16 control;
u16 status;
u16 epintr_set;
u16 epintr_clear;
u16 epintr_status;
u16 coreintr_set;
u16 coreintr_clear;
u16 coreintr_status;
u16 phy_utmi;
u16 mode;
u16 tx_mode;
u16 rx_mode;
/* bit positions for control */
unsigned reset:5;
/* bit positions for interrupt */
unsigned usb_shift:5;
u32 usb_mask;
u32 usb_bitmap;
unsigned drvvbus:5;
unsigned txep_shift:5;
u32 txep_mask;
u32 txep_bitmap;
unsigned rxep_shift:5;
u32 rxep_mask;
u32 rxep_bitmap;
/* bit positions for phy_utmi */
unsigned otg_disable:5;
/* bit positions for mode */
unsigned iddig:5;
unsigned iddig_mux:5;
/* miscellaneous stuff */
unsigned poll_timeout;
};
/*
* register shadow for suspend
*/
struct dsps_context {
u32 control;
u32 epintr;
u32 coreintr;
u32 phy_utmi;
u32 mode;
u32 tx_mode;
u32 rx_mode;
};
/**
* DSPS glue structure.
*/
struct dsps_glue {
struct device *dev;
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struct platform_device *musb; /* child musb pdev */
const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
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struct timer_list timer; /* otg_workaround timer */
unsigned long last_timer; /* last timer data for each instance */
bool sw_babble_enabled;
struct dsps_context context;
struct debugfs_regset32 regset;
struct dentry *dbgfs_root;
};
static const struct debugfs_reg32 dsps_musb_regs[] = {
{ "revision", 0x00 },
{ "control", 0x14 },
{ "status", 0x18 },
{ "eoi", 0x24 },
{ "intr0_stat", 0x30 },
{ "intr1_stat", 0x34 },
{ "intr0_set", 0x38 },
{ "intr1_set", 0x3c },
{ "txmode", 0x70 },
{ "rxmode", 0x74 },
{ "autoreq", 0xd0 },
{ "srpfixtime", 0xd4 },
{ "tdown", 0xd8 },
{ "phy_utmi", 0xe0 },
{ "mode", 0xe8 },
};
static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
{
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
if (timeout == 0)
timeout = jiffies + msecs_to_jiffies(3);
/* Never idle if active, or when VBUS timeout is not set as host */
if (musb->is_active || (musb->a_wait_bcon == 0 &&
musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) {
dev_dbg(musb->controller, "%s active, deleting timer\n",
usb_otg_state_string(musb->xceiv->otg->state));
del_timer(&glue->timer);
glue->last_timer = jiffies;
return;
}
if (musb->port_mode != MUSB_PORT_MODE_DUAL_ROLE)
return;
if (!musb->g.dev.driver)
return;
if (time_after(glue->last_timer, timeout) &&
timer_pending(&glue->timer)) {
dev_dbg(musb->controller,
"Longer idle timer already pending, ignoring...\n");
return;
}
glue->last_timer = timeout;
dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
usb_otg_state_string(musb->xceiv->otg->state),
jiffies_to_msecs(timeout - jiffies));
mod_timer(&glue->timer, timeout);
}
/**
* dsps_musb_enable - enable interrupts
*/
static void dsps_musb_enable(struct musb *musb)
{
struct device *dev = musb->controller;
struct platform_device *pdev = to_platform_device(dev->parent);
struct dsps_glue *glue = platform_get_drvdata(pdev);
const struct dsps_musb_wrapper *wrp = glue->wrp;
void __iomem *reg_base = musb->ctrl_base;
u32 epmask, coremask;
/* Workaround: setup IRQs through both register sets. */
epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
musb_writel(reg_base, wrp->epintr_set, epmask);
musb_writel(reg_base, wrp->coreintr_set, coremask);
/* start polling for ID change in dual-role idle mode */
if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
mod_timer(&glue->timer, jiffies +
msecs_to_jiffies(wrp->poll_timeout));
dsps_musb_try_idle(musb, 0);
}
/**
* dsps_musb_disable - disable HDRC and flush interrupts
*/
static void dsps_musb_disable(struct musb *musb)
{
struct device *dev = musb->controller;
struct platform_device *pdev = to_platform_device(dev->parent);
struct dsps_glue *glue = platform_get_drvdata(pdev);
const struct dsps_musb_wrapper *wrp = glue->wrp;
void __iomem *reg_base = musb->ctrl_base;
musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
musb_writel(reg_base, wrp->epintr_clear,
wrp->txep_bitmap | wrp->rxep_bitmap);
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
}
static void otg_timer(unsigned long _musb)
{
struct musb *musb = (void *)_musb;
void __iomem *mregs = musb->mregs;
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
const struct dsps_musb_wrapper *wrp = glue->wrp;
u8 devctl;
unsigned long flags;
usb: musb: dsps: redo the otg timer According to the comments, we rely on the OTG timer because the core does not expose some important OTG details. So far this is all I know. After playing with OTG I stumbled over a problem: musb is recognized as a B-device without a problem. Whenever a cable is plugged, the VBUS rises, musb recognizes this as a starting session, sets the MUSB_DEVCTL_SESSION bit by itself and a RESET interrupt occurs, the session starts. Good. After a disconnect, the timer is started and re-starts itself because it remains in B_IDLE with the BDEVICE set. I didn't figure the the reason or the need for it. Nothing changes here except for OTG state from B to A device if the BDEVICE bit disappears. This doesn't make much sense to me because nothing happens after this. _IF_ we receive an interrupt before the state change then we may act on wrong condition. Plugging a B-device (and letting MUSB act as host) doesn't work here. The reason seems to be that the MUSB tries to start a session, it fails and then it removes the bit. So we never start as a host. This patch sets the MUSB_DEVCTL_SESSION bit in the IDLE state so musb can try to establish a session as host. After the bit is set, musb tries to start a session and if it fails it clears the bit. Therefore it will try over and over again until a session either as host or as device is established. The readout of the MUSB_DEVCTL register after the removal the MUSB_DEVCTL_SESSION (in A_WAIT_BCON) has been removed because it did not contain the BDEVICE bit set (in the second read) leading to A_IDLE. After plugging a host musb assumed that it is also a host and complained about a missing reset. However a third read of the register has has the BDEVICE bit set so it seems that it is not stable. This mostly what da8xx.c is doing except that we set the timer also after A_WAIT_BCON so the session bit can be triggered. Whit this change I was able to keep am335x-evm in OTG mode and plug in either a HOST or a DEVICE and in a random order and the device was recognized. Cc: stable@vger.kernel.org # v3.11 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-15 16:29:25 +00:00
int skip_session = 0;
/*
* We poll because DSPS IP's won't expose several OTG-critical
* status change events (from the transceiver) otherwise.
*/
devctl = musb_readb(mregs, MUSB_DEVCTL);
dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
usb_otg_state_string(musb->xceiv->otg->state));
spin_lock_irqsave(&musb->lock, flags);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_WAIT_BCON:
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
usb: musb: dsps: redo the otg timer According to the comments, we rely on the OTG timer because the core does not expose some important OTG details. So far this is all I know. After playing with OTG I stumbled over a problem: musb is recognized as a B-device without a problem. Whenever a cable is plugged, the VBUS rises, musb recognizes this as a starting session, sets the MUSB_DEVCTL_SESSION bit by itself and a RESET interrupt occurs, the session starts. Good. After a disconnect, the timer is started and re-starts itself because it remains in B_IDLE with the BDEVICE set. I didn't figure the the reason or the need for it. Nothing changes here except for OTG state from B to A device if the BDEVICE bit disappears. This doesn't make much sense to me because nothing happens after this. _IF_ we receive an interrupt before the state change then we may act on wrong condition. Plugging a B-device (and letting MUSB act as host) doesn't work here. The reason seems to be that the MUSB tries to start a session, it fails and then it removes the bit. So we never start as a host. This patch sets the MUSB_DEVCTL_SESSION bit in the IDLE state so musb can try to establish a session as host. After the bit is set, musb tries to start a session and if it fails it clears the bit. Therefore it will try over and over again until a session either as host or as device is established. The readout of the MUSB_DEVCTL register after the removal the MUSB_DEVCTL_SESSION (in A_WAIT_BCON) has been removed because it did not contain the BDEVICE bit set (in the second read) leading to A_IDLE. After plugging a host musb assumed that it is also a host and complained about a missing reset. However a third read of the register has has the BDEVICE bit set so it seems that it is not stable. This mostly what da8xx.c is doing except that we set the timer also after A_WAIT_BCON so the session bit can be triggered. Whit this change I was able to keep am335x-evm in OTG mode and plug in either a HOST or a DEVICE and in a random order and the device was recognized. Cc: stable@vger.kernel.org # v3.11 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-15 16:29:25 +00:00
skip_session = 1;
/* fall */
usb: musb: dsps: redo the otg timer According to the comments, we rely on the OTG timer because the core does not expose some important OTG details. So far this is all I know. After playing with OTG I stumbled over a problem: musb is recognized as a B-device without a problem. Whenever a cable is plugged, the VBUS rises, musb recognizes this as a starting session, sets the MUSB_DEVCTL_SESSION bit by itself and a RESET interrupt occurs, the session starts. Good. After a disconnect, the timer is started and re-starts itself because it remains in B_IDLE with the BDEVICE set. I didn't figure the the reason or the need for it. Nothing changes here except for OTG state from B to A device if the BDEVICE bit disappears. This doesn't make much sense to me because nothing happens after this. _IF_ we receive an interrupt before the state change then we may act on wrong condition. Plugging a B-device (and letting MUSB act as host) doesn't work here. The reason seems to be that the MUSB tries to start a session, it fails and then it removes the bit. So we never start as a host. This patch sets the MUSB_DEVCTL_SESSION bit in the IDLE state so musb can try to establish a session as host. After the bit is set, musb tries to start a session and if it fails it clears the bit. Therefore it will try over and over again until a session either as host or as device is established. The readout of the MUSB_DEVCTL register after the removal the MUSB_DEVCTL_SESSION (in A_WAIT_BCON) has been removed because it did not contain the BDEVICE bit set (in the second read) leading to A_IDLE. After plugging a host musb assumed that it is also a host and complained about a missing reset. However a third read of the register has has the BDEVICE bit set so it seems that it is not stable. This mostly what da8xx.c is doing except that we set the timer also after A_WAIT_BCON so the session bit can be triggered. Whit this change I was able to keep am335x-evm in OTG mode and plug in either a HOST or a DEVICE and in a random order and the device was recognized. Cc: stable@vger.kernel.org # v3.11 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-15 16:29:25 +00:00
case OTG_STATE_A_IDLE:
case OTG_STATE_B_IDLE:
if (devctl & MUSB_DEVCTL_BDEVICE) {
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
MUSB_DEV_MODE(musb);
} else {
musb->xceiv->otg->state = OTG_STATE_A_IDLE;
MUSB_HST_MODE(musb);
}
usb: musb: dsps: redo the otg timer According to the comments, we rely on the OTG timer because the core does not expose some important OTG details. So far this is all I know. After playing with OTG I stumbled over a problem: musb is recognized as a B-device without a problem. Whenever a cable is plugged, the VBUS rises, musb recognizes this as a starting session, sets the MUSB_DEVCTL_SESSION bit by itself and a RESET interrupt occurs, the session starts. Good. After a disconnect, the timer is started and re-starts itself because it remains in B_IDLE with the BDEVICE set. I didn't figure the the reason or the need for it. Nothing changes here except for OTG state from B to A device if the BDEVICE bit disappears. This doesn't make much sense to me because nothing happens after this. _IF_ we receive an interrupt before the state change then we may act on wrong condition. Plugging a B-device (and letting MUSB act as host) doesn't work here. The reason seems to be that the MUSB tries to start a session, it fails and then it removes the bit. So we never start as a host. This patch sets the MUSB_DEVCTL_SESSION bit in the IDLE state so musb can try to establish a session as host. After the bit is set, musb tries to start a session and if it fails it clears the bit. Therefore it will try over and over again until a session either as host or as device is established. The readout of the MUSB_DEVCTL register after the removal the MUSB_DEVCTL_SESSION (in A_WAIT_BCON) has been removed because it did not contain the BDEVICE bit set (in the second read) leading to A_IDLE. After plugging a host musb assumed that it is also a host and complained about a missing reset. However a third read of the register has has the BDEVICE bit set so it seems that it is not stable. This mostly what da8xx.c is doing except that we set the timer also after A_WAIT_BCON so the session bit can be triggered. Whit this change I was able to keep am335x-evm in OTG mode and plug in either a HOST or a DEVICE and in a random order and the device was recognized. Cc: stable@vger.kernel.org # v3.11 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-15 16:29:25 +00:00
if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
musb_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
mod_timer(&glue->timer, jiffies +
msecs_to_jiffies(wrp->poll_timeout));
break;
case OTG_STATE_A_WAIT_VFALL:
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
musb_writel(musb->ctrl_base, wrp->coreintr_set,
MUSB_INTR_VBUSERROR << wrp->usb_shift);
break;
default:
break;
}
spin_unlock_irqrestore(&musb->lock, flags);
}
static irqreturn_t dsps_interrupt(int irq, void *hci)
{
struct musb *musb = hci;
void __iomem *reg_base = musb->ctrl_base;
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
const struct dsps_musb_wrapper *wrp = glue->wrp;
unsigned long flags;
irqreturn_t ret = IRQ_NONE;
u32 epintr, usbintr;
spin_lock_irqsave(&musb->lock, flags);
/* Get endpoint interrupts */
epintr = musb_readl(reg_base, wrp->epintr_status);
musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
if (epintr)
musb_writel(reg_base, wrp->epintr_status, epintr);
/* Get usb core interrupts */
usbintr = musb_readl(reg_base, wrp->coreintr_status);
if (!usbintr && !epintr)
goto out;
musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
if (usbintr)
musb_writel(reg_base, wrp->coreintr_status, usbintr);
dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
usbintr, epintr);
if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
int drvvbus = musb_readl(reg_base, wrp->status);
void __iomem *mregs = musb->mregs;
u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
int err;
err = musb->int_usb & MUSB_INTR_VBUSERROR;
if (err) {
/*
* The Mentor core doesn't debounce VBUS as needed
* to cope with device connect current spikes. This
* means it's not uncommon for bus-powered devices
* to get VBUS errors during enumeration.
*
* This is a workaround, but newer RTL from Mentor
* seems to allow a better one: "re"-starting sessions
* without waiting for VBUS to stop registering in
* devctl.
*/
musb->int_usb &= ~MUSB_INTR_VBUSERROR;
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
mod_timer(&glue->timer, jiffies +
msecs_to_jiffies(wrp->poll_timeout));
WARNING("VBUS error workaround (delay coming)\n");
} else if (drvvbus) {
MUSB_HST_MODE(musb);
musb->xceiv->otg->default_a = 1;
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
2013-07-05 12:51:33 +00:00
del_timer(&glue->timer);
} else {
musb->is_active = 0;
MUSB_DEV_MODE(musb);
musb->xceiv->otg->default_a = 0;
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
}
/* NOTE: this must complete power-on within 100 ms. */
dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
drvvbus ? "on" : "off",
usb_otg_state_string(musb->xceiv->otg->state),
err ? " ERROR" : "",
devctl);
ret = IRQ_HANDLED;
}
if (musb->int_tx || musb->int_rx || musb->int_usb)
ret |= musb_interrupt(musb);
/* Poll for ID change in OTG port mode */
if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
mod_timer(&glue->timer, jiffies +
msecs_to_jiffies(wrp->poll_timeout));
out:
spin_unlock_irqrestore(&musb->lock, flags);
return ret;
}
static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
{
struct dentry *root;
struct dentry *file;
char buf[128];
sprintf(buf, "%s.dsps", dev_name(musb->controller));
root = debugfs_create_dir(buf, NULL);
if (!root)
return -ENOMEM;
glue->dbgfs_root = root;
glue->regset.regs = dsps_musb_regs;
glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
glue->regset.base = musb->ctrl_base;
file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
if (!file) {
debugfs_remove_recursive(root);
return -ENOMEM;
}
return 0;
}
static int dsps_musb_init(struct musb *musb)
{
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
2013-07-05 12:51:33 +00:00
struct platform_device *parent = to_platform_device(dev->parent);
const struct dsps_musb_wrapper *wrp = glue->wrp;
2013-07-05 12:51:33 +00:00
void __iomem *reg_base;
struct resource *r;
u32 rev, val;
int ret;
2013-07-05 12:51:33 +00:00
r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
reg_base = devm_ioremap_resource(dev, r);
if (IS_ERR(reg_base))
return PTR_ERR(reg_base);
2013-07-05 12:51:33 +00:00
musb->ctrl_base = reg_base;
/* NOP driver needs change if supporting dual instance */
musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0);
2013-07-05 12:51:33 +00:00
if (IS_ERR(musb->xceiv))
return PTR_ERR(musb->xceiv);
musb->phy = devm_phy_get(dev->parent, "usb2-phy");
/* Returns zero if e.g. not clocked */
rev = musb_readl(reg_base, wrp->revision);
2013-07-05 12:51:33 +00:00
if (!rev)
return -ENODEV;
usb_phy_init(musb->xceiv);
if (IS_ERR(musb->phy)) {
musb->phy = NULL;
} else {
ret = phy_init(musb->phy);
if (ret < 0)
return ret;
ret = phy_power_on(musb->phy);
if (ret) {
phy_exit(musb->phy);
return ret;
}
}
2013-07-05 12:51:33 +00:00
setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
/* Reset the musb */
musb_writel(reg_base, wrp->control, (1 << wrp->reset));
musb->isr = dsps_interrupt;
/* reset the otgdisable bit, needed for host mode to work */
val = musb_readl(reg_base, wrp->phy_utmi);
val &= ~(1 << wrp->otg_disable);
musb_writel(musb->ctrl_base, wrp->phy_utmi, val);
/*
* Check whether the dsps version has babble control enabled.
* In latest silicon revision the babble control logic is enabled.
* If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
* logic enabled.
*/
val = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
if (val & MUSB_BABBLE_RCV_DISABLE) {
glue->sw_babble_enabled = true;
val |= MUSB_BABBLE_SW_SESSION_CTRL;
musb_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
}
return dsps_musb_dbg_init(musb, glue);
}
static int dsps_musb_exit(struct musb *musb)
{
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
2013-07-05 12:51:33 +00:00
del_timer_sync(&glue->timer);
usb_phy_shutdown(musb->xceiv);
phy_power_off(musb->phy);
phy_exit(musb->phy);
debugfs_remove_recursive(glue->dbgfs_root);
return 0;
}
static int dsps_musb_set_mode(struct musb *musb, u8 mode)
{
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
const struct dsps_musb_wrapper *wrp = glue->wrp;
void __iomem *ctrl_base = musb->ctrl_base;
u32 reg;
reg = musb_readl(ctrl_base, wrp->mode);
switch (mode) {
case MUSB_HOST:
reg &= ~(1 << wrp->iddig);
/*
* if we're setting mode to host-only or device-only, we're
* going to ignore whatever the PHY sends us and just force
* ID pin status by SW
*/
reg |= (1 << wrp->iddig_mux);
musb_writel(ctrl_base, wrp->mode, reg);
musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
break;
case MUSB_PERIPHERAL:
reg |= (1 << wrp->iddig);
/*
* if we're setting mode to host-only or device-only, we're
* going to ignore whatever the PHY sends us and just force
* ID pin status by SW
*/
reg |= (1 << wrp->iddig_mux);
musb_writel(ctrl_base, wrp->mode, reg);
break;
case MUSB_OTG:
musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
break;
default:
dev_err(glue->dev, "unsupported mode %d\n", mode);
return -EINVAL;
}
return 0;
}
static bool dsps_sw_babble_control(struct musb *musb)
{
u8 babble_ctl;
bool session_restart = false;
babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n",
babble_ctl);
/*
* check line monitor flag to check whether babble is
* due to noise
*/
dev_dbg(musb->controller, "STUCK_J is %s\n",
babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset");
if (babble_ctl & MUSB_BABBLE_STUCK_J) {
int timeout = 10;
/*
* babble is due to noise, then set transmit idle (d7 bit)
* to resume normal operation
*/
babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE;
musb_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl);
/* wait till line monitor flag cleared */
dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n");
do {
babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
udelay(1);
} while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--);
/* check whether stuck_at_j bit cleared */
if (babble_ctl & MUSB_BABBLE_STUCK_J) {
/*
* real babble condition has occurred
* restart the controller to start the
* session again
*/
dev_dbg(musb->controller, "J not cleared, misc (%x)\n",
babble_ctl);
session_restart = true;
}
} else {
session_restart = true;
}
return session_restart;
}
static int dsps_musb_recover(struct musb *musb)
{
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
int session_restart = 0;
if (glue->sw_babble_enabled)
session_restart = dsps_sw_babble_control(musb);
else
session_restart = 1;
return session_restart ? 0 : -EPIPE;
}
/* Similar to am35x, dm81xx support only 32-bit read operation */
static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
{
void __iomem *fifo = hw_ep->fifo;
if (len >= 4) {
ioread32_rep(fifo, dst, len >> 2);
dst += len & ~0x03;
len &= 0x03;
}
/* Read any remaining 1 to 3 bytes */
if (len > 0) {
u32 val = musb_readl(fifo, 0);
memcpy(dst, &val, len);
}
}
static struct musb_platform_ops dsps_ops = {
.quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP,
.init = dsps_musb_init,
.exit = dsps_musb_exit,
#ifdef CONFIG_USB_TI_CPPI41_DMA
.dma_init = cppi41_dma_controller_create,
.dma_exit = cppi41_dma_controller_destroy,
#endif
.enable = dsps_musb_enable,
.disable = dsps_musb_disable,
.try_idle = dsps_musb_try_idle,
.set_mode = dsps_musb_set_mode,
.recover = dsps_musb_recover,
};
static u64 musb_dmamask = DMA_BIT_MASK(32);
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static int get_int_prop(struct device_node *dn, const char *s)
{
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int ret;
u32 val;
ret = of_property_read_u32(dn, s, &val);
if (ret)
return 0;
return val;
}
static int get_musb_port_mode(struct device *dev)
{
enum usb_dr_mode mode;
mode = usb_get_dr_mode(dev);
switch (mode) {
case USB_DR_MODE_HOST:
return MUSB_PORT_MODE_HOST;
case USB_DR_MODE_PERIPHERAL:
return MUSB_PORT_MODE_GADGET;
case USB_DR_MODE_UNKNOWN:
case USB_DR_MODE_OTG:
default:
return MUSB_PORT_MODE_DUAL_ROLE;
}
}
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static int dsps_create_musb_pdev(struct dsps_glue *glue,
struct platform_device *parent)
{
struct musb_hdrc_platform_data pdata;
struct resource resources[2];
struct resource *res;
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struct device *dev = &parent->dev;
struct musb_hdrc_config *config;
struct platform_device *musb;
struct device_node *dn = parent->dev.of_node;
int ret, val;
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memset(resources, 0, sizeof(resources));
res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
if (!res) {
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dev_err(dev, "failed to get memory.\n");
return -EINVAL;
}
resources[0] = *res;
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res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc");
if (!res) {
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dev_err(dev, "failed to get irq.\n");
return -EINVAL;
}
resources[1] = *res;
/* allocate the child platform device */
musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
if (!musb) {
dev_err(dev, "failed to allocate musb device\n");
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return -ENOMEM;
}
musb->dev.parent = dev;
musb->dev.dma_mask = &musb_dmamask;
musb->dev.coherent_dma_mask = musb_dmamask;
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glue->musb = musb;
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ret = platform_device_add_resources(musb, resources,
ARRAY_SIZE(resources));
if (ret) {
dev_err(dev, "failed to add resources\n");
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goto err;
}
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config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
if (!config) {
ret = -ENOMEM;
goto err;
}
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pdata.config = config;
pdata.platform_ops = &dsps_ops;
config->num_eps = get_int_prop(dn, "mentor,num-eps");
config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
config->host_port_deassert_reset_at_resume = 1;
pdata.mode = get_musb_port_mode(dev);
/* DT keeps this entry in mA, musb expects it as per USB spec */
pdata.power = get_int_prop(dn, "mentor,power") / 2;
ret = of_property_read_u32(dn, "mentor,multipoint", &val);
if (!ret && val)
config->multipoint = true;
config->maximum_speed = usb_get_maximum_speed(&parent->dev);
switch (config->maximum_speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
break;
case USB_SPEED_SUPER:
dev_warn(dev, "ignore incorrect maximum_speed "
"(super-speed) setting in dts");
/* fall through */
default:
config->maximum_speed = USB_SPEED_HIGH;
}
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ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
if (ret) {
dev_err(dev, "failed to add platform_data\n");
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goto err;
}
ret = platform_device_add(musb);
if (ret) {
dev_err(dev, "failed to register musb device\n");
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goto err;
}
return 0;
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err:
platform_device_put(musb);
return ret;
}
static int dsps_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
const struct dsps_musb_wrapper *wrp;
struct dsps_glue *glue;
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int ret;
usb: musb: dsps: do not bind to "musb-hdrc" This went unnoticed in durin the merge window: The dsps driver creates a child device for the musb core driver _and_ attaches the of_node to it so devm_usb_get_phy_by_phandle() grabs the correct phy and attaches the devm resources to the proper device. We could also use the parent device but then devm would attach the resource to the wrong device and it would be destroyed once the parent device is gone - not the device that is used by the musb core driver. If the phy is now not available then dsps_musb_init() / devm_usb_get_phy_by_phandle() returns with EPROBE_DEFER. Since the of_node is attached it tries OF drivers as well and matches the driver against DSPS. That one creates a new child device for the musb core driver which gets probed immediately. The whole thing repeats itself until the stack overflows. I belive the same problem exists in ux500 glue code (since 313bdb11 ("usb: musb: ux500: add device tree probing support") but the drivers are now probed in the right order so they don't see it. The problem is that the dsps driver gets bound to the musb-child device due to the same of_node / matching binding. I don't really agree with having yet another child node in DT to fix this. Ideally we would have musb core driver with DT bindings and according to the binding we would select the few extra hacks / gleue layer. Therefore I suggest the driver to reject the musb-core device. Cc: Lee Jones <lee.jones@linaro.org> Tested-by: Tom Rini <trini@ti.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-01 12:31:53 +00:00
if (!strcmp(pdev->name, "musb-hdrc"))
return -ENODEV;
match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
if (!match) {
dev_err(&pdev->dev, "fail to get matching of_match struct\n");
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return -EINVAL;
}
wrp = match->data;
if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
dsps_ops.read_fifo = dsps_read_fifo32;
/* allocate glue */
glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
if (!glue)
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return -ENOMEM;
glue->dev = &pdev->dev;
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glue->wrp = wrp;
platform_set_drvdata(pdev, glue);
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
goto err2;
}
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ret = dsps_create_musb_pdev(glue, pdev);
if (ret)
goto err3;
return 0;
err3:
pm_runtime_put(&pdev->dev);
err2:
pm_runtime_disable(&pdev->dev);
return ret;
}
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static int dsps_remove(struct platform_device *pdev)
{
struct dsps_glue *glue = platform_get_drvdata(pdev);
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platform_device_unregister(glue->musb);
/* disable usbss clocks */
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
static const struct dsps_musb_wrapper am33xx_driver_data = {
.revision = 0x00,
.control = 0x14,
.status = 0x18,
.epintr_set = 0x38,
.epintr_clear = 0x40,
.epintr_status = 0x30,
.coreintr_set = 0x3c,
.coreintr_clear = 0x44,
.coreintr_status = 0x34,
.phy_utmi = 0xe0,
.mode = 0xe8,
.tx_mode = 0x70,
.rx_mode = 0x74,
.reset = 0,
.otg_disable = 21,
.iddig = 8,
.iddig_mux = 7,
.usb_shift = 0,
.usb_mask = 0x1ff,
.usb_bitmap = (0x1ff << 0),
.drvvbus = 8,
.txep_shift = 0,
.txep_mask = 0xffff,
.txep_bitmap = (0xffff << 0),
.rxep_shift = 16,
.rxep_mask = 0xfffe,
.rxep_bitmap = (0xfffe << 16),
.poll_timeout = 2000, /* ms */
};
static const struct of_device_id musb_dsps_of_match[] = {
{ .compatible = "ti,musb-am33xx",
.data = &am33xx_driver_data, },
{ .compatible = "ti,musb-dm816",
.data = &am33xx_driver_data, },
{ },
};
MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
#ifdef CONFIG_PM_SLEEP
static int dsps_suspend(struct device *dev)
{
struct dsps_glue *glue = dev_get_drvdata(dev);
const struct dsps_musb_wrapper *wrp = glue->wrp;
struct musb *musb = platform_get_drvdata(glue->musb);
void __iomem *mbase;
del_timer_sync(&glue->timer);
if (!musb)
/* This can happen if the musb device is in -EPROBE_DEFER */
return 0;
mbase = musb->ctrl_base;
glue->context.control = musb_readl(mbase, wrp->control);
glue->context.epintr = musb_readl(mbase, wrp->epintr_set);
glue->context.coreintr = musb_readl(mbase, wrp->coreintr_set);
glue->context.phy_utmi = musb_readl(mbase, wrp->phy_utmi);
glue->context.mode = musb_readl(mbase, wrp->mode);
glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode);
glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode);
return 0;
}
static int dsps_resume(struct device *dev)
{
struct dsps_glue *glue = dev_get_drvdata(dev);
const struct dsps_musb_wrapper *wrp = glue->wrp;
struct musb *musb = platform_get_drvdata(glue->musb);
void __iomem *mbase;
if (!musb)
return 0;
mbase = musb->ctrl_base;
musb_writel(mbase, wrp->control, glue->context.control);
musb_writel(mbase, wrp->epintr_set, glue->context.epintr);
musb_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
musb_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
musb_writel(mbase, wrp->mode, glue->context.mode);
musb_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
musb_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
mod_timer(&glue->timer, jiffies +
msecs_to_jiffies(wrp->poll_timeout));
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
static struct platform_driver dsps_usbss_driver = {
.probe = dsps_probe,
.remove = dsps_remove,
.driver = {
.name = "musb-dsps",
.pm = &dsps_pm_ops,
.of_match_table = musb_dsps_of_match,
},
};
MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
MODULE_LICENSE("GPL v2");
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module_platform_driver(dsps_usbss_driver);