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linux/drivers/usb/musb/musb_core.c
Tony Lindgren 318324e6df usb: musb: Implement tracing for state change events 
The devctl register on musb is the only way to get state information
on musb. The hardware can easily get confused because it tries to do
things on it's own automagically, and things like slow VBUS rise can
make things fail.

Let's make it easier to debug the ongoing state change issues that
keep popping up on regular basis and add tracing support.

With these changes we can easily trace musb state change events with:

echo 1 > /sys/kernel/debug/tracing/events/musb/musb_state/enable
cat /sys/kernel/debug/tracing/trace_pipe
echo 0 > /sys/kernel/debug/tracing/events/musb/musb_state/enable

Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Andreas Kemnade <andreas@kemnade.info>
Cc: Bhushan Shah <bshah@kde.org>
Cc: Drew Fustini <drew@beagleboard.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210604080536.12185-2-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-14 10:25:16 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* MUSB OTG driver core code
*
* Copyright 2005 Mentor Graphics Corporation
* Copyright (C) 2005-2006 by Texas Instruments
* Copyright (C) 2006-2007 Nokia Corporation
*/
/*
* Inventra (Multipoint) Dual-Role Controller Driver for Linux.
*
* This consists of a Host Controller Driver (HCD) and a peripheral
* controller driver implementing the "Gadget" API; OTG support is
* in the works. These are normal Linux-USB controller drivers which
* use IRQs and have no dedicated thread.
*
* This version of the driver has only been used with products from
* Texas Instruments. Those products integrate the Inventra logic
* with other DMA, IRQ, and bus modules, as well as other logic that
* needs to be reflected in this driver.
*
*
* NOTE: the original Mentor code here was pretty much a collection
* of mechanisms that don't seem to have been fully integrated/working
* for *any* Linux kernel version. This version aims at Linux 2.6.now,
* Key open issues include:
*
* - Lack of host-side transaction scheduling, for all transfer types.
* The hardware doesn't do it; instead, software must.
*
* This is not an issue for OTG devices that don't support external
* hubs, but for more "normal" USB hosts it's a user issue that the
* "multipoint" support doesn't scale in the expected ways. That
* includes DaVinci EVM in a common non-OTG mode.
*
* * Control and bulk use dedicated endpoints, and there's as
* yet no mechanism to either (a) reclaim the hardware when
* peripherals are NAKing, which gets complicated with bulk
* endpoints, or (b) use more than a single bulk endpoint in
* each direction.
*
* RESULT: one device may be perceived as blocking another one.
*
* * Interrupt and isochronous will dynamically allocate endpoint
* hardware, but (a) there's no record keeping for bandwidth;
* (b) in the common case that few endpoints are available, there
* is no mechanism to reuse endpoints to talk to multiple devices.
*
* RESULT: At one extreme, bandwidth can be overcommitted in
* some hardware configurations, no faults will be reported.
* At the other extreme, the bandwidth capabilities which do
* exist tend to be severely undercommitted. You can't yet hook
* up both a keyboard and a mouse to an external USB hub.
*/
/*
* This gets many kinds of configuration information:
* - Kconfig for everything user-configurable
* - platform_device for addressing, irq, and platform_data
* - platform_data is mostly for board-specific information
* (plus recentrly, SOC or family details)
*
* Most of the conditional compilation will (someday) vanish.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kobject.h>
#include <linux/prefetch.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/dma-mapping.h>
#include <linux/usb.h>
#include <linux/usb/of.h>
#include "musb_core.h"
#include "musb_trace.h"
#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
#define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
#define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
#define MUSB_VERSION "6.0"
#define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
#define MUSB_DRIVER_NAME "musb-hdrc"
const char musb_driver_name[] = MUSB_DRIVER_NAME;
MODULE_DESCRIPTION(DRIVER_INFO);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
/*-------------------------------------------------------------------------*/
static inline struct musb *dev_to_musb(struct device *dev)
{
return dev_get_drvdata(dev);
}
enum musb_mode musb_get_mode(struct device *dev)
{
enum usb_dr_mode mode;
mode = usb_get_dr_mode(dev);
switch (mode) {
case USB_DR_MODE_HOST:
return MUSB_HOST;
case USB_DR_MODE_PERIPHERAL:
return MUSB_PERIPHERAL;
case USB_DR_MODE_OTG:
case USB_DR_MODE_UNKNOWN:
default:
return MUSB_OTG;
}
}
EXPORT_SYMBOL_GPL(musb_get_mode);
/*-------------------------------------------------------------------------*/
static int musb_ulpi_read(struct usb_phy *phy, u32 reg)
{
void __iomem *addr = phy->io_priv;
int i = 0;
u8 r;
u8 power;
int ret;
pm_runtime_get_sync(phy->io_dev);
/* Make sure the transceiver is not in low power mode */
power = musb_readb(addr, MUSB_POWER);
power &= ~MUSB_POWER_SUSPENDM;
musb_writeb(addr, MUSB_POWER, power);
/* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
* ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
*/
musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
& MUSB_ULPI_REG_CMPLT)) {
i++;
if (i == 10000) {
ret = -ETIMEDOUT;
goto out;
}
}
r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
r &= ~MUSB_ULPI_REG_CMPLT;
musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
out:
pm_runtime_put(phy->io_dev);
return ret;
}
static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg)
{
void __iomem *addr = phy->io_priv;
int i = 0;
u8 r = 0;
u8 power;
int ret = 0;
pm_runtime_get_sync(phy->io_dev);
/* Make sure the transceiver is not in low power mode */
power = musb_readb(addr, MUSB_POWER);
power &= ~MUSB_POWER_SUSPENDM;
musb_writeb(addr, MUSB_POWER, power);
musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val);
musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
& MUSB_ULPI_REG_CMPLT)) {
i++;
if (i == 10000) {
ret = -ETIMEDOUT;
goto out;
}
}
r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
r &= ~MUSB_ULPI_REG_CMPLT;
musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
out:
pm_runtime_put(phy->io_dev);
return ret;
}
static struct usb_phy_io_ops musb_ulpi_access = {
.read = musb_ulpi_read,
.write = musb_ulpi_write,
};
/*-------------------------------------------------------------------------*/
static u32 musb_default_fifo_offset(u8 epnum)
{
return 0x20 + (epnum * 4);
}
/* "flat" mapping: each endpoint has its own i/o address */
static void musb_flat_ep_select(void __iomem *mbase, u8 epnum)
{
}
static u32 musb_flat_ep_offset(u8 epnum, u16 offset)
{
return 0x100 + (0x10 * epnum) + offset;
}
/* "indexed" mapping: INDEX register controls register bank select */
static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum)
{
musb_writeb(mbase, MUSB_INDEX, epnum);
}
static u32 musb_indexed_ep_offset(u8 epnum, u16 offset)
{
return 0x10 + offset;
}
static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
{
return 0x80 + (0x08 * epnum) + offset;
}
static u8 musb_default_readb(void __iomem *addr, u32 offset)
{
u8 data = __raw_readb(addr + offset);
trace_musb_readb(__builtin_return_address(0), addr, offset, data);
return data;
}
static void musb_default_writeb(void __iomem *addr, u32 offset, u8 data)
{
trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
__raw_writeb(data, addr + offset);
}
static u16 musb_default_readw(void __iomem *addr, u32 offset)
{
u16 data = __raw_readw(addr + offset);
trace_musb_readw(__builtin_return_address(0), addr, offset, data);
return data;
}
static void musb_default_writew(void __iomem *addr, u32 offset, u16 data)
{
trace_musb_writew(__builtin_return_address(0), addr, offset, data);
__raw_writew(data, addr + offset);
}
static u16 musb_default_get_toggle(struct musb_qh *qh, int is_out)
{
void __iomem *epio = qh->hw_ep->regs;
u16 csr;
if (is_out)
csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
else
csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
return csr;
}
static u16 musb_default_set_toggle(struct musb_qh *qh, int is_out,
struct urb *urb)
{
u16 csr;
u16 toggle;
toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);
if (is_out)
csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
| MUSB_TXCSR_H_DATATOGGLE)
: MUSB_TXCSR_CLRDATATOG;
else
csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
| MUSB_RXCSR_H_DATATOGGLE) : 0;
return csr;
}
/*
* Load an endpoint's FIFO
*/
static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
const u8 *src)
{
struct musb *musb = hw_ep->musb;
void __iomem *fifo = hw_ep->fifo;
if (unlikely(len == 0))
return;
prefetch((u8 *)src);
dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
'T', hw_ep->epnum, fifo, len, src);
/* we can't assume unaligned reads work */
if (likely((0x01 & (unsigned long) src) == 0)) {
u16 index = 0;
/* best case is 32bit-aligned source address */
if ((0x02 & (unsigned long) src) == 0) {
if (len >= 4) {
iowrite32_rep(fifo, src + index, len >> 2);
index += len & ~0x03;
}
if (len & 0x02) {
__raw_writew(*(u16 *)&src[index], fifo);
index += 2;
}
} else {
if (len >= 2) {
iowrite16_rep(fifo, src + index, len >> 1);
index += len & ~0x01;
}
}
if (len & 0x01)
__raw_writeb(src[index], fifo);
} else {
/* byte aligned */
iowrite8_rep(fifo, src, len);
}
}
/*
* Unload an endpoint's FIFO
*/
static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
{
struct musb *musb = hw_ep->musb;
void __iomem *fifo = hw_ep->fifo;
if (unlikely(len == 0))
return;
dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
'R', hw_ep->epnum, fifo, len, dst);
/* we can't assume unaligned writes work */
if (likely((0x01 & (unsigned long) dst) == 0)) {
u16 index = 0;
/* best case is 32bit-aligned destination address */
if ((0x02 & (unsigned long) dst) == 0) {
if (len >= 4) {
ioread32_rep(fifo, dst, len >> 2);
index = len & ~0x03;
}
if (len & 0x02) {
*(u16 *)&dst[index] = __raw_readw(fifo);
index += 2;
}
} else {
if (len >= 2) {
ioread16_rep(fifo, dst, len >> 1);
index = len & ~0x01;
}
}
if (len & 0x01)
dst[index] = __raw_readb(fifo);
} else {
/* byte aligned */
ioread8_rep(fifo, dst, len);
}
}
/*
* Old style IO functions
*/
u8 (*musb_readb)(void __iomem *addr, u32 offset);
EXPORT_SYMBOL_GPL(musb_readb);
void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data);
EXPORT_SYMBOL_GPL(musb_writeb);
u8 (*musb_clearb)(void __iomem *addr, u32 offset);
EXPORT_SYMBOL_GPL(musb_clearb);
u16 (*musb_readw)(void __iomem *addr, u32 offset);
EXPORT_SYMBOL_GPL(musb_readw);
void (*musb_writew)(void __iomem *addr, u32 offset, u16 data);
EXPORT_SYMBOL_GPL(musb_writew);
u16 (*musb_clearw)(void __iomem *addr, u32 offset);
EXPORT_SYMBOL_GPL(musb_clearw);
u32 musb_readl(void __iomem *addr, u32 offset)
{
u32 data = __raw_readl(addr + offset);
trace_musb_readl(__builtin_return_address(0), addr, offset, data);
return data;
}
EXPORT_SYMBOL_GPL(musb_readl);
void musb_writel(void __iomem *addr, u32 offset, u32 data)
{
trace_musb_writel(__builtin_return_address(0), addr, offset, data);
__raw_writel(data, addr + offset);
}
EXPORT_SYMBOL_GPL(musb_writel);
#ifndef CONFIG_MUSB_PIO_ONLY
struct dma_controller *
(*musb_dma_controller_create)(struct musb *musb, void __iomem *base);
EXPORT_SYMBOL(musb_dma_controller_create);
void (*musb_dma_controller_destroy)(struct dma_controller *c);
EXPORT_SYMBOL(musb_dma_controller_destroy);
#endif
/*
* New style IO functions
*/
void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
{
return hw_ep->musb->io.read_fifo(hw_ep, len, dst);
}
void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
{
return hw_ep->musb->io.write_fifo(hw_ep, len, src);
}
static u8 musb_read_devctl(struct musb *musb)
{
return musb_readb(musb->mregs, MUSB_DEVCTL);
}
/**
* musb_set_host - set and initialize host mode
* @musb: musb controller driver data
*
* At least some musb revisions need to enable devctl session bit in
* peripheral mode to switch to host mode. Initializes things to host
* mode and sets A_IDLE. SoC glue needs to advance state further
* based on phy provided VBUS state.
*
* Note that the SoC glue code may need to wait for musb to settle
* on enable before calling this to avoid babble.
*/
int musb_set_host(struct musb *musb)
{
int error = 0;
u8 devctl;
if (!musb)
return -EINVAL;
devctl = musb_read_devctl(musb);
if (!(devctl & MUSB_DEVCTL_BDEVICE)) {
trace_musb_state(musb, devctl, "Already in host mode");
goto init_data;
}
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
error = readx_poll_timeout(musb_read_devctl, musb, devctl,
!(devctl & MUSB_DEVCTL_BDEVICE), 5000,
1000000);
if (error) {
dev_err(musb->controller, "%s: could not set host: %02x\n",
__func__, devctl);
return error;
}
devctl = musb_read_devctl(musb);
trace_musb_state(musb, devctl, "Host mode set");
init_data:
musb->is_active = 1;
musb->xceiv->otg->state = OTG_STATE_A_IDLE;
MUSB_HST_MODE(musb);
return error;
}
EXPORT_SYMBOL_GPL(musb_set_host);
/**
* musb_set_peripheral - set and initialize peripheral mode
* @musb: musb controller driver data
*
* Clears devctl session bit and initializes things for peripheral
* mode and sets B_IDLE. SoC glue needs to advance state further
* based on phy provided VBUS state.
*/
int musb_set_peripheral(struct musb *musb)
{
int error = 0;
u8 devctl;
if (!musb)
return -EINVAL;
devctl = musb_read_devctl(musb);
if (devctl & MUSB_DEVCTL_BDEVICE) {
trace_musb_state(musb, devctl, "Already in peripheral mode");
goto init_data;
}
devctl &= ~MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
error = readx_poll_timeout(musb_read_devctl, musb, devctl,
devctl & MUSB_DEVCTL_BDEVICE, 5000,
1000000);
if (error) {
dev_err(musb->controller, "%s: could not set peripheral: %02x\n",
__func__, devctl);
return error;
}
devctl = musb_read_devctl(musb);
trace_musb_state(musb, devctl, "Peripheral mode set");
init_data:
musb->is_active = 0;
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
MUSB_DEV_MODE(musb);
return error;
}
EXPORT_SYMBOL_GPL(musb_set_peripheral);
/*-------------------------------------------------------------------------*/
/* for high speed test mode; see USB 2.0 spec 7.1.20 */
static const u8 musb_test_packet[53] = {
/* implicit SYNC then DATA0 to start */
/* JKJKJKJK x9 */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* JJKKJJKK x8 */
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
/* JJJJKKKK x8 */
0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
/* JJJJJJJKKKKKKK x8 */
0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
/* JJJJJJJK x8 */
0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
/* JKKKKKKK x10, JK */
0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
/* implicit CRC16 then EOP to end */
};
void musb_load_testpacket(struct musb *musb)
{
void __iomem *regs = musb->endpoints[0].regs;
musb_ep_select(musb->mregs, 0);
musb_write_fifo(musb->control_ep,
sizeof(musb_test_packet), musb_test_packet);
musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
}
/*-------------------------------------------------------------------------*/
/*
* Handles OTG hnp timeouts, such as b_ase0_brst
*/
static void musb_otg_timer_func(struct timer_list *t)
{
struct musb *musb = from_timer(musb, t, otg_timer);
unsigned long flags;
spin_lock_irqsave(&musb->lock, flags);
switch (musb->xceiv->otg->state) {
case OTG_STATE_B_WAIT_ACON:
musb_dbg(musb,
"HNP: b_wait_acon timeout; back to b_peripheral");
musb_g_disconnect(musb);
musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
musb->is_active = 0;
break;
case OTG_STATE_A_SUSPEND:
case OTG_STATE_A_WAIT_BCON:
musb_dbg(musb, "HNP: %s timeout",
usb_otg_state_string(musb->xceiv->otg->state));
musb_platform_set_vbus(musb, 0);
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
break;
default:
musb_dbg(musb, "HNP: Unhandled mode %s",
usb_otg_state_string(musb->xceiv->otg->state));
}
spin_unlock_irqrestore(&musb->lock, flags);
}
/*
* Stops the HNP transition. Caller must take care of locking.
*/
void musb_hnp_stop(struct musb *musb)
{
struct usb_hcd *hcd = musb->hcd;
void __iomem *mbase = musb->mregs;
u8 reg;
musb_dbg(musb, "HNP: stop from %s",
usb_otg_state_string(musb->xceiv->otg->state));
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_PERIPHERAL:
musb_g_disconnect(musb);
musb_dbg(musb, "HNP: back to %s",
usb_otg_state_string(musb->xceiv->otg->state));
break;
case OTG_STATE_B_HOST:
musb_dbg(musb, "HNP: Disabling HR");
if (hcd)
hcd->self.is_b_host = 0;
musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
MUSB_DEV_MODE(musb);
reg = musb_readb(mbase, MUSB_POWER);
reg |= MUSB_POWER_SUSPENDM;
musb_writeb(mbase, MUSB_POWER, reg);
/* REVISIT: Start SESSION_REQUEST here? */
break;
default:
musb_dbg(musb, "HNP: Stopping in unknown state %s",
usb_otg_state_string(musb->xceiv->otg->state));
}
/*
* When returning to A state after HNP, avoid hub_port_rebounce(),
* which cause occasional OPT A "Did not receive reset after connect"
* errors.
*/
musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
}
static void musb_recover_from_babble(struct musb *musb);
static void musb_handle_intr_resume(struct musb *musb, u8 devctl)
{
musb_dbg(musb, "RESUME (%s)",
usb_otg_state_string(musb->xceiv->otg->state));
if (devctl & MUSB_DEVCTL_HM) {
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_SUSPEND:
/* remote wakeup? */
musb->port1_status |=
(USB_PORT_STAT_C_SUSPEND << 16)
| MUSB_PORT_STAT_RESUME;
musb->rh_timer = jiffies
+ msecs_to_jiffies(USB_RESUME_TIMEOUT);
musb->xceiv->otg->state = OTG_STATE_A_HOST;
musb->is_active = 1;
musb_host_resume_root_hub(musb);
schedule_delayed_work(&musb->finish_resume_work,
msecs_to_jiffies(USB_RESUME_TIMEOUT));
break;
case OTG_STATE_B_WAIT_ACON:
musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
musb->is_active = 1;
MUSB_DEV_MODE(musb);
break;
default:
WARNING("bogus %s RESUME (%s)\n",
"host",
usb_otg_state_string(musb->xceiv->otg->state));
}
} else {
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_SUSPEND:
/* possibly DISCONNECT is upcoming */
musb->xceiv->otg->state = OTG_STATE_A_HOST;
musb_host_resume_root_hub(musb);
break;
case OTG_STATE_B_WAIT_ACON:
case OTG_STATE_B_PERIPHERAL:
/* disconnect while suspended? we may
* not get a disconnect irq...
*/
if ((devctl & MUSB_DEVCTL_VBUS)
!= (3 << MUSB_DEVCTL_VBUS_SHIFT)
) {
musb->int_usb |= MUSB_INTR_DISCONNECT;
musb->int_usb &= ~MUSB_INTR_SUSPEND;
break;
}
musb_g_resume(musb);
break;
case OTG_STATE_B_IDLE:
musb->int_usb &= ~MUSB_INTR_SUSPEND;
break;
default:
WARNING("bogus %s RESUME (%s)\n",
"peripheral",
usb_otg_state_string(musb->xceiv->otg->state));
}
}
}
/* return IRQ_HANDLED to tell the caller to return immediately */
static irqreturn_t musb_handle_intr_sessreq(struct musb *musb, u8 devctl)
{
void __iomem *mbase = musb->mregs;
if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
&& (devctl & MUSB_DEVCTL_BDEVICE)) {
musb_dbg(musb, "SessReq while on B state");
return IRQ_HANDLED;
}
musb_dbg(musb, "SESSION_REQUEST (%s)",
usb_otg_state_string(musb->xceiv->otg->state));
/* IRQ arrives from ID pin sense or (later, if VBUS power
* is removed) SRP. responses are time critical:
* - turn on VBUS (with silicon-specific mechanism)
* - go through A_WAIT_VRISE
* - ... to A_WAIT_BCON.
* a_wait_vrise_tmout triggers VBUS_ERROR transitions
*/
musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
musb->ep0_stage = MUSB_EP0_START;
musb->xceiv->otg->state = OTG_STATE_A_IDLE;
MUSB_HST_MODE(musb);
musb_platform_set_vbus(musb, 1);
return IRQ_NONE;
}
static void musb_handle_intr_vbuserr(struct musb *musb, u8 devctl)
{
int ignore = 0;
/* During connection as an A-Device, we may see a short
* current spikes causing voltage drop, because of cable
* and peripheral capacitance combined with vbus draw.
* (So: less common with truly self-powered devices, where
* vbus doesn't act like a power supply.)
*
* Such spikes are short; usually less than ~500 usec, max
* of ~2 msec. That is, they're not sustained overcurrent
* errors, though they're reported using VBUSERROR irqs.
*
* Workarounds: (a) hardware: use self powered devices.
* (b) software: ignore non-repeated VBUS errors.
*
* REVISIT: do delays from lots of DEBUG_KERNEL checks
* make trouble here, keeping VBUS < 4.4V ?
*/
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_HOST:
/* recovery is dicey once we've gotten past the
* initial stages of enumeration, but if VBUS
* stayed ok at the other end of the link, and
* another reset is due (at least for high speed,
* to redo the chirp etc), it might work OK...
*/
case OTG_STATE_A_WAIT_BCON:
case OTG_STATE_A_WAIT_VRISE:
if (musb->vbuserr_retry) {
void __iomem *mbase = musb->mregs;
musb->vbuserr_retry--;
ignore = 1;
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(mbase, MUSB_DEVCTL, devctl);
} else {
musb->port1_status |=
USB_PORT_STAT_OVERCURRENT
| (USB_PORT_STAT_C_OVERCURRENT << 16);
}
break;
default:
break;
}
dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
"VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
usb_otg_state_string(musb->xceiv->otg->state),
devctl,
({ char *s;
switch (devctl & MUSB_DEVCTL_VBUS) {
case 0 << MUSB_DEVCTL_VBUS_SHIFT:
s = "<SessEnd"; break;
case 1 << MUSB_DEVCTL_VBUS_SHIFT:
s = "<AValid"; break;
case 2 << MUSB_DEVCTL_VBUS_SHIFT:
s = "<VBusValid"; break;
/* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
default:
s = "VALID"; break;
} s; }),
VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
musb->port1_status);
/* go through A_WAIT_VFALL then start a new session */
if (!ignore)
musb_platform_set_vbus(musb, 0);
}
static void musb_handle_intr_suspend(struct musb *musb, u8 devctl)
{
musb_dbg(musb, "SUSPEND (%s) devctl %02x",
usb_otg_state_string(musb->xceiv->otg->state), devctl);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_PERIPHERAL:
/* We also come here if the cable is removed, since
* this silicon doesn't report ID-no-longer-grounded.
*
* We depend on T(a_wait_bcon) to shut us down, and
* hope users don't do anything dicey during this
* undesired detour through A_WAIT_BCON.
*/
musb_hnp_stop(musb);
musb_host_resume_root_hub(musb);
musb_root_disconnect(musb);
musb_platform_try_idle(musb, jiffies
+ msecs_to_jiffies(musb->a_wait_bcon
? : OTG_TIME_A_WAIT_BCON));
break;
case OTG_STATE_B_IDLE:
if (!musb->is_active)
break;
fallthrough;
case OTG_STATE_B_PERIPHERAL:
musb_g_suspend(musb);
musb->is_active = musb->g.b_hnp_enable;
if (musb->is_active) {
musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
musb_dbg(musb, "HNP: Setting timer for b_ase0_brst");
mod_timer(&musb->otg_timer, jiffies
+ msecs_to_jiffies(
OTG_TIME_B_ASE0_BRST));
}
break;
case OTG_STATE_A_WAIT_BCON:
if (musb->a_wait_bcon != 0)
musb_platform_try_idle(musb, jiffies
+ msecs_to_jiffies(musb->a_wait_bcon));
break;
case OTG_STATE_A_HOST:
musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
musb->is_active = musb->hcd->self.b_hnp_enable;
break;
case OTG_STATE_B_HOST:
/* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
musb_dbg(musb, "REVISIT: SUSPEND as B_HOST");
break;
default:
/* "should not happen" */
musb->is_active = 0;
break;
}
}
static void musb_handle_intr_connect(struct musb *musb, u8 devctl, u8 int_usb)
{
struct usb_hcd *hcd = musb->hcd;
musb->is_active = 1;
musb->ep0_stage = MUSB_EP0_START;
musb->intrtxe = musb->epmask;
musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
musb->intrrxe = musb->epmask & 0xfffe;
musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
|USB_PORT_STAT_HIGH_SPEED
|USB_PORT_STAT_ENABLE
);
musb->port1_status |= USB_PORT_STAT_CONNECTION
|(USB_PORT_STAT_C_CONNECTION << 16);
/* high vs full speed is just a guess until after reset */
if (devctl & MUSB_DEVCTL_LSDEV)
musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
/* indicate new connection to OTG machine */
switch (musb->xceiv->otg->state) {
case OTG_STATE_B_PERIPHERAL:
if (int_usb & MUSB_INTR_SUSPEND) {
musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host");
int_usb &= ~MUSB_INTR_SUSPEND;
goto b_host;
} else
musb_dbg(musb, "CONNECT as b_peripheral???");
break;
case OTG_STATE_B_WAIT_ACON:
musb_dbg(musb, "HNP: CONNECT, now b_host");
b_host:
musb->xceiv->otg->state = OTG_STATE_B_HOST;
if (musb->hcd)
musb->hcd->self.is_b_host = 1;
del_timer(&musb->otg_timer);
break;
default:
if ((devctl & MUSB_DEVCTL_VBUS)
== (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
musb->xceiv->otg->state = OTG_STATE_A_HOST;
if (hcd)
hcd->self.is_b_host = 0;
}
break;
}
musb_host_poke_root_hub(musb);
musb_dbg(musb, "CONNECT (%s) devctl %02x",
usb_otg_state_string(musb->xceiv->otg->state), devctl);
}
static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl)
{
musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x",
usb_otg_state_string(musb->xceiv->otg->state),
MUSB_MODE(musb), devctl);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_HOST:
case OTG_STATE_A_SUSPEND:
musb_host_resume_root_hub(musb);
musb_root_disconnect(musb);
if (musb->a_wait_bcon != 0)
musb_platform_try_idle(musb, jiffies
+ msecs_to_jiffies(musb->a_wait_bcon));
break;
case OTG_STATE_B_HOST:
/* REVISIT this behaves for "real disconnect"
* cases; make sure the other transitions from
* from B_HOST act right too. The B_HOST code
* in hnp_stop() is currently not used...
*/
musb_root_disconnect(musb);
if (musb->hcd)
musb->hcd->self.is_b_host = 0;
musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
MUSB_DEV_MODE(musb);
musb_g_disconnect(musb);
break;
case OTG_STATE_A_PERIPHERAL:
musb_hnp_stop(musb);
musb_root_disconnect(musb);
fallthrough;
case OTG_STATE_B_WAIT_ACON:
case OTG_STATE_B_PERIPHERAL:
case OTG_STATE_B_IDLE:
musb_g_disconnect(musb);
break;
default:
WARNING("unhandled DISCONNECT transition (%s)\n",
usb_otg_state_string(musb->xceiv->otg->state));
break;
}
}
/*
* mentor saves a bit: bus reset and babble share the same irq.
* only host sees babble; only peripheral sees bus reset.
*/
static void musb_handle_intr_reset(struct musb *musb)
{
if (is_host_active(musb)) {
/*
* When BABBLE happens what we can depends on which
* platform MUSB is running, because some platforms
* implemented proprietary means for 'recovering' from
* Babble conditions. One such platform is AM335x. In
* most cases, however, the only thing we can do is
* drop the session.
*/
dev_err(musb->controller, "Babble\n");
musb_recover_from_babble(musb);
} else {
musb_dbg(musb, "BUS RESET as %s",
usb_otg_state_string(musb->xceiv->otg->state));
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_SUSPEND:
musb_g_reset(musb);
fallthrough;
case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */
/* never use invalid T(a_wait_bcon) */
musb_dbg(musb, "HNP: in %s, %d msec timeout",
usb_otg_state_string(musb->xceiv->otg->state),
TA_WAIT_BCON(musb));
mod_timer(&musb->otg_timer, jiffies
+ msecs_to_jiffies(TA_WAIT_BCON(musb)));
break;
case OTG_STATE_A_PERIPHERAL:
del_timer(&musb->otg_timer);
musb_g_reset(musb);
break;
case OTG_STATE_B_WAIT_ACON:
musb_dbg(musb, "HNP: RESET (%s), to b_peripheral",
usb_otg_state_string(musb->xceiv->otg->state));
musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
musb_g_reset(musb);
break;
case OTG_STATE_B_IDLE:
musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
fallthrough;
case OTG_STATE_B_PERIPHERAL:
musb_g_reset(musb);
break;
default:
musb_dbg(musb, "Unhandled BUS RESET as %s",
usb_otg_state_string(musb->xceiv->otg->state));
}
}
}
/*
* Interrupt Service Routine to record USB "global" interrupts.
* Since these do not happen often and signify things of
* paramount importance, it seems OK to check them individually;
* the order of the tests is specified in the manual
*
* @param musb instance pointer
* @param int_usb register contents
* @param devctl
*/
static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
u8 devctl)
{
irqreturn_t handled = IRQ_NONE;
musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb);
/* in host mode, the peripheral may issue remote wakeup.
* in peripheral mode, the host may resume the link.
* spurious RESUME irqs happen too, paired with SUSPEND.
*/
if (int_usb & MUSB_INTR_RESUME) {
musb_handle_intr_resume(musb, devctl);
handled = IRQ_HANDLED;
}
/* see manual for the order of the tests */
if (int_usb & MUSB_INTR_SESSREQ) {
if (musb_handle_intr_sessreq(musb, devctl))
return IRQ_HANDLED;
handled = IRQ_HANDLED;
}
if (int_usb & MUSB_INTR_VBUSERROR) {
musb_handle_intr_vbuserr(musb, devctl);
handled = IRQ_HANDLED;
}
if (int_usb & MUSB_INTR_SUSPEND) {
musb_handle_intr_suspend(musb, devctl);
handled = IRQ_HANDLED;
}
if (int_usb & MUSB_INTR_CONNECT) {
musb_handle_intr_connect(musb, devctl, int_usb);
handled = IRQ_HANDLED;
}
if (int_usb & MUSB_INTR_DISCONNECT) {
musb_handle_intr_disconnect(musb, devctl);
handled = IRQ_HANDLED;
}
if (int_usb & MUSB_INTR_RESET) {
musb_handle_intr_reset(musb);
handled = IRQ_HANDLED;
}
#if 0
/* REVISIT ... this would be for multiplexing periodic endpoints, or
* supporting transfer phasing to prevent exceeding ISO bandwidth
* limits of a given frame or microframe.
*
* It's not needed for peripheral side, which dedicates endpoints;
* though it _might_ use SOF irqs for other purposes.
*
* And it's not currently needed for host side, which also dedicates
* endpoints, relies on TX/RX interval registers, and isn't claimed
* to support ISO transfers yet.
*/
if (int_usb & MUSB_INTR_SOF) {
void __iomem *mbase = musb->mregs;
struct musb_hw_ep *ep;
u8 epnum;
u16 frame;
dev_dbg(musb->controller, "START_OF_FRAME\n");
handled = IRQ_HANDLED;
/* start any periodic Tx transfers waiting for current frame */
frame = musb_readw(mbase, MUSB_FRAME);
ep = musb->endpoints;
for (epnum = 1; (epnum < musb->nr_endpoints)
&& (musb->epmask >= (1 << epnum));
epnum++, ep++) {
/*
* FIXME handle framecounter wraps (12 bits)
* eliminate duplicated StartUrb logic
*/
if (ep->dwWaitFrame >= frame) {
ep->dwWaitFrame = 0;
pr_debug("SOF --> periodic TX%s on %d\n",
ep->tx_channel ? " DMA" : "",
epnum);
if (!ep->tx_channel)
musb_h_tx_start(musb, epnum);
else
cppi_hostdma_start(musb, epnum);
}
} /* end of for loop */
}
#endif
schedule_delayed_work(&musb->irq_work, 0);
return handled;
}
/*-------------------------------------------------------------------------*/
static void musb_disable_interrupts(struct musb *musb)
{
void __iomem *mbase = musb->mregs;
/* disable interrupts */
musb_writeb(mbase, MUSB_INTRUSBE, 0);
musb->intrtxe = 0;
musb_writew(mbase, MUSB_INTRTXE, 0);
musb->intrrxe = 0;
musb_writew(mbase, MUSB_INTRRXE, 0);
/* flush pending interrupts */
musb_clearb(mbase, MUSB_INTRUSB);
musb_clearw(mbase, MUSB_INTRTX);
musb_clearw(mbase, MUSB_INTRRX);
}
static void musb_enable_interrupts(struct musb *musb)
{
void __iomem *regs = musb->mregs;
/* Set INT enable registers, enable interrupts */
musb->intrtxe = musb->epmask;
musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
musb->intrrxe = musb->epmask & 0xfffe;
musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
}
/*
* Program the HDRC to start (enable interrupts, dma, etc.).
*/
void musb_start(struct musb *musb)
{
void __iomem *regs = musb->mregs;
u8 devctl = musb_readb(regs, MUSB_DEVCTL);
u8 power;
musb_dbg(musb, "<== devctl %02x", devctl);
musb_enable_interrupts(musb);
musb_writeb(regs, MUSB_TESTMODE, 0);
power = MUSB_POWER_ISOUPDATE;
/*
* treating UNKNOWN as unspecified maximum speed, in which case
* we will default to high-speed.
*/
if (musb->config->maximum_speed == USB_SPEED_HIGH ||
musb->config->maximum_speed == USB_SPEED_UNKNOWN)
power |= MUSB_POWER_HSENAB;
musb_writeb(regs, MUSB_POWER, power);
musb->is_active = 0;
devctl = musb_readb(regs, MUSB_DEVCTL);
devctl &= ~MUSB_DEVCTL_SESSION;
/* session started after:
* (a) ID-grounded irq, host mode;
* (b) vbus present/connect IRQ, peripheral mode;
* (c) peripheral initiates, using SRP
*/
if (musb->port_mode != MUSB_HOST &&
musb->xceiv->otg->state != OTG_STATE_A_WAIT_BCON &&
(devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
musb->is_active = 1;
} else {
devctl |= MUSB_DEVCTL_SESSION;
}
musb_platform_enable(musb);
musb_writeb(regs, MUSB_DEVCTL, devctl);
}
/*
* Make the HDRC stop (disable interrupts, etc.);
* reversible by musb_start
* called on gadget driver unregister
* with controller locked, irqs blocked
* acts as a NOP unless some role activated the hardware
*/
void musb_stop(struct musb *musb)
{
/* stop IRQs, timers, ... */
musb_platform_disable(musb);
musb_disable_interrupts(musb);
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
/* FIXME
* - mark host and/or peripheral drivers unusable/inactive
* - disable DMA (and enable it in HdrcStart)
* - make sure we can musb_start() after musb_stop(); with
* OTG mode, gadget driver module rmmod/modprobe cycles that
* - ...
*/
musb_platform_try_idle(musb, 0);
}
/*-------------------------------------------------------------------------*/
/*
* The silicon either has hard-wired endpoint configurations, or else
* "dynamic fifo" sizing. The driver has support for both, though at this
* writing only the dynamic sizing is very well tested. Since we switched
* away from compile-time hardware parameters, we can no longer rely on
* dead code elimination to leave only the relevant one in the object file.
*
* We don't currently use dynamic fifo setup capability to do anything
* more than selecting one of a bunch of predefined configurations.
*/
static ushort fifo_mode;
/* "modprobe ... fifo_mode=1" etc */
module_param(fifo_mode, ushort, 0);
MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
/*
* tables defining fifo_mode values. define more if you like.
* for host side, make sure both halves of ep1 are set up.
*/
/* mode 0 - fits in 2KB */
static struct musb_fifo_cfg mode_0_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};
/* mode 1 - fits in 4KB */
static struct musb_fifo_cfg mode_1_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};
/* mode 2 - fits in 4KB */
static struct musb_fifo_cfg mode_2_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 960, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 1024, },
};
/* mode 3 - fits in 4KB */
static struct musb_fifo_cfg mode_3_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};
/* mode 4 - fits in 16KB */
static struct musb_fifo_cfg mode_4_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, },
{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, },
{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, },
{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, },
{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, },
{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, },
{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
};
/* mode 5 - fits in 8KB */
static struct musb_fifo_cfg mode_5_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, },
{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, },
{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
};
/*
* configure a fifo; for non-shared endpoints, this may be called
* once for a tx fifo and once for an rx fifo.
*
* returns negative errno or offset for next fifo.
*/
static int
fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep,
const struct musb_fifo_cfg *cfg, u16 offset)
{
void __iomem *mbase = musb->mregs;
int size = 0;
u16 maxpacket = cfg->maxpacket;
u16 c_off = offset >> 3;
u8 c_size;
/* expect hw_ep has already been zero-initialized */
size = ffs(max(maxpacket, (u16) 8)) - 1;
maxpacket = 1 << size;
c_size = size - 3;
if (cfg->mode == BUF_DOUBLE) {
if ((offset + (maxpacket << 1)) >
(1 << (musb->config->ram_bits + 2)))
return -EMSGSIZE;
c_size |= MUSB_FIFOSZ_DPB;
} else {
if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
return -EMSGSIZE;
}
/* configure the FIFO */
musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
/* EP0 reserved endpoint for control, bidirectional;
* EP1 reserved for bulk, two unidirectional halves.
*/
if (hw_ep->epnum == 1)
musb->bulk_ep = hw_ep;
/* REVISIT error check: be sure ep0 can both rx and tx ... */
switch (cfg->style) {
case FIFO_TX:
musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
musb_writew(mbase, MUSB_TXFIFOADD, c_off);
hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
hw_ep->max_packet_sz_tx = maxpacket;
break;
case FIFO_RX:
musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
musb_writew(mbase, MUSB_RXFIFOADD, c_off);
hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
hw_ep->max_packet_sz_rx = maxpacket;
break;
case FIFO_RXTX:
musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
musb_writew(mbase, MUSB_TXFIFOADD, c_off);
hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
hw_ep->max_packet_sz_rx = maxpacket;
musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
musb_writew(mbase, MUSB_RXFIFOADD, c_off);
hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
hw_ep->max_packet_sz_tx = maxpacket;
hw_ep->is_shared_fifo = true;
break;
}
/* NOTE rx and tx endpoint irqs aren't managed separately,
* which happens to be ok
*/
musb->epmask |= (1 << hw_ep->epnum);
return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
}
static struct musb_fifo_cfg ep0_cfg = {
.style = FIFO_RXTX, .maxpacket = 64,
};
static int ep_config_from_table(struct musb *musb)
{
const struct musb_fifo_cfg *cfg;
unsigned i, n;
int offset;
struct musb_hw_ep *hw_ep = musb->endpoints;
if (musb->config->fifo_cfg) {
cfg = musb->config->fifo_cfg;
n = musb->config->fifo_cfg_size;
goto done;
}
switch (fifo_mode) {
default:
fifo_mode = 0;
fallthrough;
case 0:
cfg = mode_0_cfg;
n = ARRAY_SIZE(mode_0_cfg);
break;
case 1:
cfg = mode_1_cfg;
n = ARRAY_SIZE(mode_1_cfg);
break;
case 2:
cfg = mode_2_cfg;
n = ARRAY_SIZE(mode_2_cfg);
break;
case 3:
cfg = mode_3_cfg;
n = ARRAY_SIZE(mode_3_cfg);
break;
case 4:
cfg = mode_4_cfg;
n = ARRAY_SIZE(mode_4_cfg);
break;
case 5:
cfg = mode_5_cfg;
n = ARRAY_SIZE(mode_5_cfg);
break;
}
pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
done:
offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
/* assert(offset > 0) */
/* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would
* be better than static musb->config->num_eps and DYN_FIFO_SIZE...
*/
for (i = 0; i < n; i++) {
u8 epn = cfg->hw_ep_num;
if (epn >= musb->config->num_eps) {
pr_debug("%s: invalid ep %d\n",
musb_driver_name, epn);
return -EINVAL;
}
offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
if (offset < 0) {
pr_debug("%s: mem overrun, ep %d\n",
musb_driver_name, epn);
return offset;
}
epn++;
musb->nr_endpoints = max(epn, musb->nr_endpoints);
}
pr_debug("%s: %d/%d max ep, %d/%d memory\n",
musb_driver_name,
n + 1, musb->config->num_eps * 2 - 1,
offset, (1 << (musb->config->ram_bits + 2)));
if (!musb->bulk_ep) {
pr_debug("%s: missing bulk\n", musb_driver_name);
return -EINVAL;
}
return 0;
}
/*
* ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
* @param musb the controller
*/
static int ep_config_from_hw(struct musb *musb)
{
u8 epnum = 0;
struct musb_hw_ep *hw_ep;
void __iomem *mbase = musb->mregs;
int ret = 0;
musb_dbg(musb, "<== static silicon ep config");
/* FIXME pick up ep0 maxpacket size */
for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
musb_ep_select(mbase, epnum);
hw_ep = musb->endpoints + epnum;
ret = musb_read_fifosize(musb, hw_ep, epnum);
if (ret < 0)
break;
/* FIXME set up hw_ep->{rx,tx}_double_buffered */
/* pick an RX/TX endpoint for bulk */
if (hw_ep->max_packet_sz_tx < 512
|| hw_ep->max_packet_sz_rx < 512)
continue;
/* REVISIT: this algorithm is lazy, we should at least
* try to pick a double buffered endpoint.
*/
if (musb->bulk_ep)
continue;
musb->bulk_ep = hw_ep;
}
if (!musb->bulk_ep) {
pr_debug("%s: missing bulk\n", musb_driver_name);
return -EINVAL;
}
return 0;
}
enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
/* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
* configure endpoints, or take their config from silicon
*/
static int musb_core_init(u16 musb_type, struct musb *musb)
{
u8 reg;
char *type;
char aInfo[90];
void __iomem *mbase = musb->mregs;
int status = 0;
int i;
/* log core options (read using indexed model) */
reg = musb_read_configdata(mbase);
strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
if (reg & MUSB_CONFIGDATA_DYNFIFO) {
strcat(aInfo, ", dyn FIFOs");
musb->dyn_fifo = true;
}
if (reg & MUSB_CONFIGDATA_MPRXE) {
strcat(aInfo, ", bulk combine");
musb->bulk_combine = true;
}
if (reg & MUSB_CONFIGDATA_MPTXE) {
strcat(aInfo, ", bulk split");
musb->bulk_split = true;
}
if (reg & MUSB_CONFIGDATA_HBRXE) {
strcat(aInfo, ", HB-ISO Rx");
musb->hb_iso_rx = true;
}
if (reg & MUSB_CONFIGDATA_HBTXE) {
strcat(aInfo, ", HB-ISO Tx");
musb->hb_iso_tx = true;
}
if (reg & MUSB_CONFIGDATA_SOFTCONE)
strcat(aInfo, ", SoftConn");
pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
if (MUSB_CONTROLLER_MHDRC == musb_type) {
musb->is_multipoint = 1;
type = "M";
} else {
musb->is_multipoint = 0;
type = "";
if (IS_ENABLED(CONFIG_USB) &&
!IS_ENABLED(CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB)) {
pr_err("%s: kernel must disable external hubs, please fix the configuration\n",
musb_driver_name);
}
}
/* log release info */
musb->hwvers = musb_readw(mbase, MUSB_HWVERS);
pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
MUSB_HWVERS_MINOR(musb->hwvers),
(musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
/* configure ep0 */
musb_configure_ep0(musb);
/* discover endpoint configuration */
musb->nr_endpoints = 1;
musb->epmask = 1;
if (musb->dyn_fifo)
status = ep_config_from_table(musb);
else
status = ep_config_from_hw(musb);
if (status < 0)
return status;
/* finish init, and print endpoint config */
for (i = 0; i < musb->nr_endpoints; i++) {
struct musb_hw_ep *hw_ep = musb->endpoints + i;
hw_ep->fifo = musb->io.fifo_offset(i) + mbase;
#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
if (musb->ops->quirks & MUSB_IN_TUSB) {
hw_ep->fifo_async = musb->async + 0x400 +
musb->io.fifo_offset(i);
hw_ep->fifo_sync = musb->sync + 0x400 +
musb->io.fifo_offset(i);
hw_ep->fifo_sync_va =
musb->sync_va + 0x400 + musb->io.fifo_offset(i);
if (i == 0)
hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
else
hw_ep->conf = mbase + 0x400 +
(((i - 1) & 0xf) << 2);
}
#endif
hw_ep->regs = musb->io.ep_offset(i, 0) + mbase;
hw_ep->rx_reinit = 1;
hw_ep->tx_reinit = 1;
if (hw_ep->max_packet_sz_tx) {
musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
musb_driver_name, i,
hw_ep->is_shared_fifo ? "shared" : "tx",
hw_ep->tx_double_buffered
? "doublebuffer, " : "",
hw_ep->max_packet_sz_tx);
}
if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
musb_driver_name, i,
"rx",
hw_ep->rx_double_buffered
? "doublebuffer, " : "",
hw_ep->max_packet_sz_rx);
}
if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
musb_dbg(musb, "hw_ep %d not configured", i);
}
return 0;
}
/*-------------------------------------------------------------------------*/
/*
* handle all the irqs defined by the HDRC core. for now we expect: other
* irq sources (phy, dma, etc) will be handled first, musb->int_* values
* will be assigned, and the irq will already have been acked.
*
* called in irq context with spinlock held, irqs blocked
*/
irqreturn_t musb_interrupt(struct musb *musb)
{
irqreturn_t retval = IRQ_NONE;
unsigned long status;
unsigned long epnum;
u8 devctl;
if (!musb->int_usb && !musb->int_tx && !musb->int_rx)
return IRQ_NONE;
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
trace_musb_isr(musb);
/**
* According to Mentor Graphics' documentation, flowchart on page 98,
* IRQ should be handled as follows:
*
* . Resume IRQ
* . Session Request IRQ
* . VBUS Error IRQ
* . Suspend IRQ
* . Connect IRQ
* . Disconnect IRQ
* . Reset/Babble IRQ
* . SOF IRQ (we're not using this one)
* . Endpoint 0 IRQ
* . TX Endpoints
* . RX Endpoints
*
* We will be following that flowchart in order to avoid any problems
* that might arise with internal Finite State Machine.
*/
if (musb->int_usb)
retval |= musb_stage0_irq(musb, musb->int_usb, devctl);
if (musb->int_tx & 1) {
if (is_host_active(musb))
retval |= musb_h_ep0_irq(musb);
else
retval |= musb_g_ep0_irq(musb);
/* we have just handled endpoint 0 IRQ, clear it */
musb->int_tx &= ~BIT(0);
}
status = musb->int_tx;
for_each_set_bit(epnum, &status, 16) {
retval = IRQ_HANDLED;
if (is_host_active(musb))
musb_host_tx(musb, epnum);
else
musb_g_tx(musb, epnum);
}
status = musb->int_rx;
for_each_set_bit(epnum, &status, 16) {
retval = IRQ_HANDLED;
if (is_host_active(musb))
musb_host_rx(musb, epnum);
else
musb_g_rx(musb, epnum);
}
return retval;
}
EXPORT_SYMBOL_GPL(musb_interrupt);
#ifndef CONFIG_MUSB_PIO_ONLY
static bool use_dma = true;
/* "modprobe ... use_dma=0" etc */
module_param(use_dma, bool, 0644);
MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
{
/* called with controller lock already held */
if (!epnum) {
if (!is_cppi_enabled(musb)) {
/* endpoint 0 */
if (is_host_active(musb))
musb_h_ep0_irq(musb);
else
musb_g_ep0_irq(musb);
}
} else {
/* endpoints 1..15 */
if (transmit) {
if (is_host_active(musb))
musb_host_tx(musb, epnum);
else
musb_g_tx(musb, epnum);
} else {
/* receive */
if (is_host_active(musb))
musb_host_rx(musb, epnum);
else
musb_g_rx(musb, epnum);
}
}
}
EXPORT_SYMBOL_GPL(musb_dma_completion);
#else
#define use_dma 0
#endif
static int (*musb_phy_callback)(enum musb_vbus_id_status status);
/*
* musb_mailbox - optional phy notifier function
* @status phy state change
*
* Optionally gets called from the USB PHY. Note that the USB PHY must be
* disabled at the point the phy_callback is registered or unregistered.
*/
int musb_mailbox(enum musb_vbus_id_status status)
{
if (musb_phy_callback)
return musb_phy_callback(status);
return -ENODEV;
};
EXPORT_SYMBOL_GPL(musb_mailbox);
/*-------------------------------------------------------------------------*/
static ssize_t
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
int ret;
spin_lock_irqsave(&musb->lock, flags);
ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
spin_unlock_irqrestore(&musb->lock, flags);
return ret;
}
static ssize_t
mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
int status;
spin_lock_irqsave(&musb->lock, flags);
if (sysfs_streq(buf, "host"))
status = musb_platform_set_mode(musb, MUSB_HOST);
else if (sysfs_streq(buf, "peripheral"))
status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
else if (sysfs_streq(buf, "otg"))
status = musb_platform_set_mode(musb, MUSB_OTG);
else
status = -EINVAL;
spin_unlock_irqrestore(&musb->lock, flags);
return (status == 0) ? n : status;
}
static DEVICE_ATTR_RW(mode);
static ssize_t
vbus_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
unsigned long val;
if (sscanf(buf, "%lu", &val) < 1) {
dev_err(dev, "Invalid VBUS timeout ms value\n");
return -EINVAL;
}
spin_lock_irqsave(&musb->lock, flags);
/* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
if (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)
musb->is_active = 0;
musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
spin_unlock_irqrestore(&musb->lock, flags);
return n;
}
static ssize_t
vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
unsigned long val;
int vbus;
u8 devctl;
pm_runtime_get_sync(dev);
spin_lock_irqsave(&musb->lock, flags);
val = musb->a_wait_bcon;
vbus = musb_platform_get_vbus_status(musb);
if (vbus < 0) {
/* Use default MUSB method by means of DEVCTL register */
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if ((devctl & MUSB_DEVCTL_VBUS)
== (3 << MUSB_DEVCTL_VBUS_SHIFT))
vbus = 1;
else
vbus = 0;
}
spin_unlock_irqrestore(&musb->lock, flags);
pm_runtime_put_sync(dev);
return sprintf(buf, "Vbus %s, timeout %lu msec\n",
vbus ? "on" : "off", val);
}
static DEVICE_ATTR_RW(vbus);
/* Gadget drivers can't know that a host is connected so they might want
* to start SRP, but users can. This allows userspace to trigger SRP.
*/
static ssize_t srp_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct musb *musb = dev_to_musb(dev);
unsigned short srp;
if (sscanf(buf, "%hu", &srp) != 1
|| (srp != 1)) {
dev_err(dev, "SRP: Value must be 1\n");
return -EINVAL;
}
if (srp == 1)
musb_g_wakeup(musb);
return n;
}
static DEVICE_ATTR_WO(srp);
static struct attribute *musb_attrs[] = {
&dev_attr_mode.attr,
&dev_attr_vbus.attr,
&dev_attr_srp.attr,
NULL
};
ATTRIBUTE_GROUPS(musb);
#define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \
(2 << MUSB_DEVCTL_VBUS_SHIFT) | \
MUSB_DEVCTL_SESSION)
#define MUSB_QUIRK_B_DISCONNECT_99 (MUSB_DEVCTL_BDEVICE | \
(3 << MUSB_DEVCTL_VBUS_SHIFT) | \
MUSB_DEVCTL_SESSION)
#define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \
MUSB_DEVCTL_SESSION)
static bool musb_state_needs_recheck(struct musb *musb, u8 devctl,
const char *desc)
{
if (musb->quirk_retries && !musb->flush_irq_work) {
trace_musb_state(musb, devctl, desc);
schedule_delayed_work(&musb->irq_work,
msecs_to_jiffies(1000));
musb->quirk_retries--;
return true;
}
return false;
}
/*
* Check the musb devctl session bit to determine if we want to
* allow PM runtime for the device. In general, we want to keep things
* active when the session bit is set except after host disconnect.
*
* Only called from musb_irq_work. If this ever needs to get called
* elsewhere, proper locking must be implemented for musb->session.
*/
static void musb_pm_runtime_check_session(struct musb *musb)
{
u8 devctl, s;
int error;
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
/* Handle session status quirks first */
s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV |
MUSB_DEVCTL_HR;
switch (devctl & ~s) {
case MUSB_QUIRK_B_DISCONNECT_99:
musb_state_needs_recheck(musb, devctl,
"Poll devctl in case of suspend after disconnect");
break;
case MUSB_QUIRK_B_INVALID_VBUS_91:
if (musb_state_needs_recheck(musb, devctl,
"Poll devctl on invalid vbus, assume no session"))
return;
fallthrough;
case MUSB_QUIRK_A_DISCONNECT_19:
if (musb_state_needs_recheck(musb, devctl,
"Poll devctl on possible host mode disconnect"))
return;
if (!musb->session)
break;
trace_musb_state(musb, devctl, "Allow PM on possible host mode disconnect");
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
musb->session = false;
return;
default:
break;
}
/* No need to do anything if session has not changed */
s = devctl & MUSB_DEVCTL_SESSION;
if (s == musb->session)
return;
/* Block PM or allow PM? */
if (s) {
trace_musb_state(musb, devctl, "Block PM on active session");
error = pm_runtime_get_sync(musb->controller);
if (error < 0)
dev_err(musb->controller, "Could not enable: %i\n",
error);
musb->quirk_retries = 3;
/*
* We can get a spurious MUSB_INTR_SESSREQ interrupt on start-up
* in B-peripheral mode with nothing connected and the session
* bit clears silently. Check status again in 3 seconds.
*/
if (devctl & MUSB_DEVCTL_BDEVICE)
schedule_delayed_work(&musb->irq_work,
msecs_to_jiffies(3000));
} else {
trace_musb_state(musb, devctl, "Allow PM with no session");
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
}
musb->session = s;
}
/* Only used to provide driver mode change events */
static void musb_irq_work(struct work_struct *data)
{
struct musb *musb = container_of(data, struct musb, irq_work.work);
int error;
error = pm_runtime_resume_and_get(musb->controller);
if (error < 0) {
dev_err(musb->controller, "Could not enable: %i\n", error);
return;
}
musb_pm_runtime_check_session(musb);
if (musb->xceiv->otg->state != musb->xceiv_old_state) {
musb->xceiv_old_state = musb->xceiv->otg->state;
sysfs_notify(&musb->controller->kobj, NULL, "mode");
}
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
}
static void musb_recover_from_babble(struct musb *musb)
{
int ret;
u8 devctl;
musb_disable_interrupts(musb);
/*
* wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give
* it some slack and wait for 10us.
*/
udelay(10);
ret = musb_platform_recover(musb);
if (ret) {
musb_enable_interrupts(musb);
return;
}
/* drop session bit */
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
devctl &= ~MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
/* tell usbcore about it */
musb_root_disconnect(musb);
/*
* When a babble condition occurs, the musb controller
* removes the session bit and the endpoint config is lost.
*/
if (musb->dyn_fifo)
ret = ep_config_from_table(musb);
else
ret = ep_config_from_hw(musb);
/* restart session */
if (ret == 0)
musb_start(musb);
}
/* --------------------------------------------------------------------------
* Init support
*/
static struct musb *allocate_instance(struct device *dev,
const struct musb_hdrc_config *config, void __iomem *mbase)
{
struct musb *musb;
struct musb_hw_ep *ep;
int epnum;
int ret;
musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
if (!musb)
return NULL;
INIT_LIST_HEAD(&musb->control);
INIT_LIST_HEAD(&musb->in_bulk);
INIT_LIST_HEAD(&musb->out_bulk);
INIT_LIST_HEAD(&musb->pending_list);
musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
musb->mregs = mbase;
musb->ctrl_base = mbase;
musb->nIrq = -ENODEV;
musb->config = config;
BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
for (epnum = 0, ep = musb->endpoints;
epnum < musb->config->num_eps;
epnum++, ep++) {
ep->musb = musb;
ep->epnum = epnum;
}
musb->controller = dev;
ret = musb_host_alloc(musb);
if (ret < 0)
goto err_free;
dev_set_drvdata(dev, musb);
return musb;
err_free:
return NULL;
}
static void musb_free(struct musb *musb)
{
/* this has multiple entry modes. it handles fault cleanup after
* probe(), where things may be partially set up, as well as rmmod
* cleanup after everything's been de-activated.
*/
if (musb->nIrq >= 0) {
if (musb->irq_wake)
disable_irq_wake(musb->nIrq);
free_irq(musb->nIrq, musb);
}
musb_host_free(musb);
}
struct musb_pending_work {
int (*callback)(struct musb *musb, void *data);
void *data;
struct list_head node;
};
#ifdef CONFIG_PM
/*
* Called from musb_runtime_resume(), musb_resume(), and
* musb_queue_resume_work(). Callers must take musb->lock.
*/
static int musb_run_resume_work(struct musb *musb)
{
struct musb_pending_work *w, *_w;
unsigned long flags;
int error = 0;
spin_lock_irqsave(&musb->list_lock, flags);
list_for_each_entry_safe(w, _w, &musb->pending_list, node) {
if (w->callback) {
error = w->callback(musb, w->data);
if (error < 0) {
dev_err(musb->controller,
"resume callback %p failed: %i\n",
w->callback, error);
}
}
list_del(&w->node);
devm_kfree(musb->controller, w);
}
spin_unlock_irqrestore(&musb->list_lock, flags);
return error;
}
#endif
/*
* Called to run work if device is active or else queue the work to happen
* on resume. Caller must take musb->lock and must hold an RPM reference.
*
* Note that we cowardly refuse queuing work after musb PM runtime
* resume is done calling musb_run_resume_work() and return -EINPROGRESS
* instead.
*/
int musb_queue_resume_work(struct musb *musb,
int (*callback)(struct musb *musb, void *data),
void *data)
{
struct musb_pending_work *w;
unsigned long flags;
bool is_suspended;
int error;
if (WARN_ON(!callback))
return -EINVAL;
spin_lock_irqsave(&musb->list_lock, flags);
is_suspended = musb->is_runtime_suspended;
if (is_suspended) {
w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC);
if (!w) {
error = -ENOMEM;
goto out_unlock;
}
w->callback = callback;
w->data = data;
list_add_tail(&w->node, &musb->pending_list);
error = 0;
}
out_unlock:
spin_unlock_irqrestore(&musb->list_lock, flags);
if (!is_suspended)
error = callback(musb, data);
return error;
}
EXPORT_SYMBOL_GPL(musb_queue_resume_work);
static void musb_deassert_reset(struct work_struct *work)
{
struct musb *musb;
unsigned long flags;
musb = container_of(work, struct musb, deassert_reset_work.work);
spin_lock_irqsave(&musb->lock, flags);
if (musb->port1_status & USB_PORT_STAT_RESET)
musb_port_reset(musb, false);
spin_unlock_irqrestore(&musb->lock, flags);
}
/*
* Perform generic per-controller initialization.
*
* @dev: the controller (already clocked, etc)
* @nIrq: IRQ number
* @ctrl: virtual address of controller registers,
* not yet corrected for platform-specific offsets
*/
static int
musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
{
int status;
struct musb *musb;
struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
/* The driver might handle more features than the board; OK.
* Fail when the board needs a feature that's not enabled.
*/
if (!plat) {
dev_err(dev, "no platform_data?\n");
status = -ENODEV;
goto fail0;
}
/* allocate */
musb = allocate_instance(dev, plat->config, ctrl);
if (!musb) {
status = -ENOMEM;
goto fail0;
}
spin_lock_init(&musb->lock);
spin_lock_init(&musb->list_lock);
musb->board_set_power = plat->set_power;
musb->min_power = plat->min_power;
musb->ops = plat->platform_ops;
musb->port_mode = plat->mode;
/*
* Initialize the default IO functions. At least omap2430 needs
* these early. We initialize the platform specific IO functions
* later on.
*/
musb_readb = musb_default_readb;
musb_writeb = musb_default_writeb;
musb_readw = musb_default_readw;
musb_writew = musb_default_writew;
/* The musb_platform_init() call:
* - adjusts musb->mregs
* - sets the musb->isr
* - may initialize an integrated transceiver
* - initializes musb->xceiv, usually by otg_get_phy()
* - stops powering VBUS
*
* There are various transceiver configurations.
* DaVinci, TUSB60x0, and others integrate them. OMAP3 uses
* external/discrete ones in various flavors (twl4030 family,
* isp1504, non-OTG, etc) mostly hooking up through ULPI.
*/
status = musb_platform_init(musb);
if (status < 0)
goto fail1;
if (!musb->isr) {
status = -ENODEV;
goto fail2;
}
/* Most devices use indexed offset or flat offset */
if (musb->ops->quirks & MUSB_INDEXED_EP) {
musb->io.ep_offset = musb_indexed_ep_offset;
musb->io.ep_select = musb_indexed_ep_select;
} else {
musb->io.ep_offset = musb_flat_ep_offset;
musb->io.ep_select = musb_flat_ep_select;
}
if (musb->ops->quirks & MUSB_G_NO_SKB_RESERVE)
musb->g.quirk_avoids_skb_reserve = 1;
/* At least tusb6010 has its own offsets */
if (musb->ops->ep_offset)
musb->io.ep_offset = musb->ops->ep_offset;
if (musb->ops->ep_select)
musb->io.ep_select = musb->ops->ep_select;
if (musb->ops->fifo_mode)
fifo_mode = musb->ops->fifo_mode;
else
fifo_mode = 4;
if (musb->ops->fifo_offset)
musb->io.fifo_offset = musb->ops->fifo_offset;
else
musb->io.fifo_offset = musb_default_fifo_offset;
if (musb->ops->busctl_offset)
musb->io.busctl_offset = musb->ops->busctl_offset;
else
musb->io.busctl_offset = musb_default_busctl_offset;
if (musb->ops->readb)
musb_readb = musb->ops->readb;
if (musb->ops->writeb)
musb_writeb = musb->ops->writeb;
if (musb->ops->clearb)
musb_clearb = musb->ops->clearb;
else
musb_clearb = musb_readb;
if (musb->ops->readw)
musb_readw = musb->ops->readw;
if (musb->ops->writew)
musb_writew = musb->ops->writew;
if (musb->ops->clearw)
musb_clearw = musb->ops->clearw;
else
musb_clearw = musb_readw;
#ifndef CONFIG_MUSB_PIO_ONLY
if (!musb->ops->dma_init || !musb->ops->dma_exit) {
dev_err(dev, "DMA controller not set\n");
status = -ENODEV;
goto fail2;
}
musb_dma_controller_create = musb->ops->dma_init;
musb_dma_controller_destroy = musb->ops->dma_exit;
#endif
if (musb->ops->read_fifo)
musb->io.read_fifo = musb->ops->read_fifo;
else
musb->io.read_fifo = musb_default_read_fifo;
if (musb->ops->write_fifo)
musb->io.write_fifo = musb->ops->write_fifo;
else
musb->io.write_fifo = musb_default_write_fifo;
if (musb->ops->get_toggle)
musb->io.get_toggle = musb->ops->get_toggle;
else
musb->io.get_toggle = musb_default_get_toggle;
if (musb->ops->set_toggle)
musb->io.set_toggle = musb->ops->set_toggle;
else
musb->io.set_toggle = musb_default_set_toggle;
if (!musb->xceiv->io_ops) {
musb->xceiv->io_dev = musb->controller;
musb->xceiv->io_priv = musb->mregs;
musb->xceiv->io_ops = &musb_ulpi_access;
}
if (musb->ops->phy_callback)
musb_phy_callback = musb->ops->phy_callback;
/*
* We need musb_read/write functions initialized for PM.
* Note that at least 2430 glue needs autosuspend delay
* somewhere above 300 ms for the hardware to idle properly
* after disconnecting the cable in host mode. Let's use
* 500 ms for some margin.
*/
pm_runtime_use_autosuspend(musb->controller);
pm_runtime_set_autosuspend_delay(musb->controller, 500);
pm_runtime_enable(musb->controller);
pm_runtime_get_sync(musb->controller);
status = usb_phy_init(musb->xceiv);
if (status < 0)
goto err_usb_phy_init;
if (use_dma && dev->dma_mask) {
musb->dma_controller =
musb_dma_controller_create(musb, musb->mregs);
if (IS_ERR(musb->dma_controller)) {
status = PTR_ERR(musb->dma_controller);
goto fail2_5;
}
}
/* be sure interrupts are disabled before connecting ISR */
musb_platform_disable(musb);
musb_disable_interrupts(musb);
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
/* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */
musb_writeb(musb->mregs, MUSB_POWER, 0);
/* Init IRQ workqueue before request_irq */
INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
/* setup musb parts of the core (especially endpoints) */
status = musb_core_init(plat->config->multipoint
? MUSB_CONTROLLER_MHDRC
: MUSB_CONTROLLER_HDRC, musb);
if (status < 0)
goto fail3;
timer_setup(&musb->otg_timer, musb_otg_timer_func, 0);
/* attach to the IRQ */
if (request_irq(nIrq, musb->isr, IRQF_SHARED, dev_name(dev), musb)) {
dev_err(dev, "request_irq %d failed!\n", nIrq);
status = -ENODEV;
goto fail3;
}
musb->nIrq = nIrq;
/* FIXME this handles wakeup irqs wrong */
if (enable_irq_wake(nIrq) == 0) {
musb->irq_wake = 1;
device_init_wakeup(dev, 1);
} else {
musb->irq_wake = 0;
}
/* program PHY to use external vBus if required */
if (plat->extvbus) {
u8 busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL);
busctl |= MUSB_ULPI_USE_EXTVBUS;
musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl);
}
MUSB_DEV_MODE(musb);
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
switch (musb->port_mode) {
case MUSB_HOST:
status = musb_host_setup(musb, plat->power);
if (status < 0)
goto fail3;
status = musb_platform_set_mode(musb, MUSB_HOST);
break;
case MUSB_PERIPHERAL:
status = musb_gadget_setup(musb);
if (status < 0)
goto fail3;
status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
break;
case MUSB_OTG:
status = musb_host_setup(musb, plat->power);
if (status < 0)
goto fail3;
status = musb_gadget_setup(musb);
if (status) {
musb_host_cleanup(musb);
goto fail3;
}
status = musb_platform_set_mode(musb, MUSB_OTG);
break;
default:
dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
break;
}
if (status < 0)
goto fail3;
musb_init_debugfs(musb);
musb->is_initialized = 1;
pm_runtime_mark_last_busy(musb->controller);
pm_runtime_put_autosuspend(musb->controller);
return 0;
fail3:
cancel_delayed_work_sync(&musb->irq_work);
cancel_delayed_work_sync(&musb->finish_resume_work);
cancel_delayed_work_sync(&musb->deassert_reset_work);
if (musb->dma_controller)
musb_dma_controller_destroy(musb->dma_controller);
fail2_5:
usb_phy_shutdown(musb->xceiv);
err_usb_phy_init:
pm_runtime_dont_use_autosuspend(musb->controller);
pm_runtime_put_sync(musb->controller);
pm_runtime_disable(musb->controller);
fail2:
if (musb->irq_wake)
device_init_wakeup(dev, 0);
musb_platform_exit(musb);
fail1:
if (status != -EPROBE_DEFER)
dev_err(musb->controller,
"%s failed with status %d\n", __func__, status);
musb_free(musb);
fail0:
return status;
}
/*-------------------------------------------------------------------------*/
/* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
* bridge to a platform device; this driver then suffices.
*/
static int musb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int irq = platform_get_irq_byname(pdev, "mc");
void __iomem *base;
if (irq <= 0)
return -ENODEV;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
return musb_init_controller(dev, irq, base);
}
static int musb_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
/* this gets called on rmmod.
* - Host mode: host may still be active
* - Peripheral mode: peripheral is deactivated (or never-activated)
* - OTG mode: both roles are deactivated (or never-activated)
*/
musb_exit_debugfs(musb);
cancel_delayed_work_sync(&musb->irq_work);
cancel_delayed_work_sync(&musb->finish_resume_work);
cancel_delayed_work_sync(&musb->deassert_reset_work);
pm_runtime_get_sync(musb->controller);
musb_host_cleanup(musb);
musb_gadget_cleanup(musb);
musb_platform_disable(musb);
spin_lock_irqsave(&musb->lock, flags);
musb_disable_interrupts(musb);
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
spin_unlock_irqrestore(&musb->lock, flags);
musb_platform_exit(musb);
pm_runtime_dont_use_autosuspend(musb->controller);
pm_runtime_put_sync(musb->controller);
pm_runtime_disable(musb->controller);
musb_phy_callback = NULL;
if (musb->dma_controller)
musb_dma_controller_destroy(musb->dma_controller);
usb_phy_shutdown(musb->xceiv);
musb_free(musb);
device_init_wakeup(dev, 0);
return 0;
}
#ifdef CONFIG_PM
static void musb_save_context(struct musb *musb)
{
int i;
void __iomem *musb_base = musb->mregs;
void __iomem *epio;
musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
musb->context.busctl = musb_readb(musb_base, MUSB_ULPI_BUSCONTROL);
musb->context.power = musb_readb(musb_base, MUSB_POWER);
musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
musb->context.index = musb_readb(musb_base, MUSB_INDEX);
musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
for (i = 0; i < musb->config->num_eps; ++i) {
struct musb_hw_ep *hw_ep;
hw_ep = &musb->endpoints[i];
if (!hw_ep)
continue;
epio = hw_ep->regs;
if (!epio)
continue;
musb_writeb(musb_base, MUSB_INDEX, i);
musb->context.index_regs[i].txmaxp =
musb_readw(epio, MUSB_TXMAXP);
musb->context.index_regs[i].txcsr =
musb_readw(epio, MUSB_TXCSR);
musb->context.index_regs[i].rxmaxp =
musb_readw(epio, MUSB_RXMAXP);
musb->context.index_regs[i].rxcsr =
musb_readw(epio, MUSB_RXCSR);
if (musb->dyn_fifo) {
musb->context.index_regs[i].txfifoadd =
musb_readw(musb_base, MUSB_TXFIFOADD);
musb->context.index_regs[i].rxfifoadd =
musb_readw(musb_base, MUSB_RXFIFOADD);
musb->context.index_regs[i].txfifosz =
musb_readb(musb_base, MUSB_TXFIFOSZ);
musb->context.index_regs[i].rxfifosz =
musb_readb(musb_base, MUSB_RXFIFOSZ);
}
musb->context.index_regs[i].txtype =
musb_readb(epio, MUSB_TXTYPE);
musb->context.index_regs[i].txinterval =
musb_readb(epio, MUSB_TXINTERVAL);
musb->context.index_regs[i].rxtype =
musb_readb(epio, MUSB_RXTYPE);
musb->context.index_regs[i].rxinterval =
musb_readb(epio, MUSB_RXINTERVAL);
musb->context.index_regs[i].txfunaddr =
musb_read_txfunaddr(musb, i);
musb->context.index_regs[i].txhubaddr =
musb_read_txhubaddr(musb, i);
musb->context.index_regs[i].txhubport =
musb_read_txhubport(musb, i);
musb->context.index_regs[i].rxfunaddr =
musb_read_rxfunaddr(musb, i);
musb->context.index_regs[i].rxhubaddr =
musb_read_rxhubaddr(musb, i);
musb->context.index_regs[i].rxhubport =
musb_read_rxhubport(musb, i);
}
}
static void musb_restore_context(struct musb *musb)
{
int i;
void __iomem *musb_base = musb->mregs;
void __iomem *epio;
u8 power;
musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
musb_writeb(musb_base, MUSB_ULPI_BUSCONTROL, musb->context.busctl);
/* Don't affect SUSPENDM/RESUME bits in POWER reg */
power = musb_readb(musb_base, MUSB_POWER);
power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME;
musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME);
power |= musb->context.power;
musb_writeb(musb_base, MUSB_POWER, power);
musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
if (musb->context.devctl & MUSB_DEVCTL_SESSION)
musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
for (i = 0; i < musb->config->num_eps; ++i) {
struct musb_hw_ep *hw_ep;
hw_ep = &musb->endpoints[i];
if (!hw_ep)
continue;
epio = hw_ep->regs;
if (!epio)
continue;
musb_writeb(musb_base, MUSB_INDEX, i);
musb_writew(epio, MUSB_TXMAXP,
musb->context.index_regs[i].txmaxp);
musb_writew(epio, MUSB_TXCSR,
musb->context.index_regs[i].txcsr);
musb_writew(epio, MUSB_RXMAXP,
musb->context.index_regs[i].rxmaxp);
musb_writew(epio, MUSB_RXCSR,
musb->context.index_regs[i].rxcsr);
if (musb->dyn_fifo) {
musb_writeb(musb_base, MUSB_TXFIFOSZ,
musb->context.index_regs[i].txfifosz);
musb_writeb(musb_base, MUSB_RXFIFOSZ,
musb->context.index_regs[i].rxfifosz);
musb_writew(musb_base, MUSB_TXFIFOADD,
musb->context.index_regs[i].txfifoadd);
musb_writew(musb_base, MUSB_RXFIFOADD,
musb->context.index_regs[i].rxfifoadd);
}
musb_writeb(epio, MUSB_TXTYPE,
musb->context.index_regs[i].txtype);
musb_writeb(epio, MUSB_TXINTERVAL,
musb->context.index_regs[i].txinterval);
musb_writeb(epio, MUSB_RXTYPE,
musb->context.index_regs[i].rxtype);
musb_writeb(epio, MUSB_RXINTERVAL,
musb->context.index_regs[i].rxinterval);
musb_write_txfunaddr(musb, i,
musb->context.index_regs[i].txfunaddr);
musb_write_txhubaddr(musb, i,
musb->context.index_regs[i].txhubaddr);
musb_write_txhubport(musb, i,
musb->context.index_regs[i].txhubport);
musb_write_rxfunaddr(musb, i,
musb->context.index_regs[i].rxfunaddr);
musb_write_rxhubaddr(musb, i,
musb->context.index_regs[i].rxhubaddr);
musb_write_rxhubport(musb, i,
musb->context.index_regs[i].rxhubport);
}
musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
}
static int musb_suspend(struct device *dev)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
int ret;
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
pm_runtime_put_noidle(dev);
return ret;
}
musb_platform_disable(musb);
musb_disable_interrupts(musb);
musb->flush_irq_work = true;
while (flush_delayed_work(&musb->irq_work))
;
musb->flush_irq_work = false;
if (!(musb->ops->quirks & MUSB_PRESERVE_SESSION))
musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
WARN_ON(!list_empty(&musb->pending_list));
spin_lock_irqsave(&musb->lock, flags);
if (is_peripheral_active(musb)) {
/* FIXME force disconnect unless we know USB will wake
* the system up quickly enough to respond ...
*/
} else if (is_host_active(musb)) {
/* we know all the children are suspended; sometimes
* they will even be wakeup-enabled.
*/
}
musb_save_context(musb);
spin_unlock_irqrestore(&musb->lock, flags);
return 0;
}
static int musb_resume(struct device *dev)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
int error;
u8 devctl;
u8 mask;
/*
* For static cmos like DaVinci, register values were preserved
* unless for some reason the whole soc powered down or the USB
* module got reset through the PSC (vs just being disabled).
*
* For the DSPS glue layer though, a full register restore has to
* be done. As it shouldn't harm other platforms, we do it
* unconditionally.
*/
musb_restore_context(musb);
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV;
if ((devctl & mask) != (musb->context.devctl & mask))
musb->port1_status = 0;
musb_enable_interrupts(musb);
musb_platform_enable(musb);
/* session might be disabled in suspend */
if (musb->port_mode == MUSB_HOST &&
!(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
}
spin_lock_irqsave(&musb->lock, flags);
error = musb_run_resume_work(musb);
if (error)
dev_err(musb->controller, "resume work failed with %i\n",
error);
spin_unlock_irqrestore(&musb->lock, flags);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0;
}
static int musb_runtime_suspend(struct device *dev)
{
struct musb *musb = dev_to_musb(dev);
musb_save_context(musb);
musb->is_runtime_suspended = 1;
return 0;
}
static int musb_runtime_resume(struct device *dev)
{
struct musb *musb = dev_to_musb(dev);
unsigned long flags;
int error;
/*
* When pm_runtime_get_sync called for the first time in driver
* init, some of the structure is still not initialized which is
* used in restore function. But clock needs to be
* enabled before any register access, so
* pm_runtime_get_sync has to be called.
* Also context restore without save does not make
* any sense
*/
if (!musb->is_initialized)
return 0;
musb_restore_context(musb);
spin_lock_irqsave(&musb->lock, flags);
error = musb_run_resume_work(musb);
if (error)
dev_err(musb->controller, "resume work failed with %i\n",
error);
musb->is_runtime_suspended = 0;
spin_unlock_irqrestore(&musb->lock, flags);
return 0;
}
static const struct dev_pm_ops musb_dev_pm_ops = {
.suspend = musb_suspend,
.resume = musb_resume,
.runtime_suspend = musb_runtime_suspend,
.runtime_resume = musb_runtime_resume,
};
#define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
#else
#define MUSB_DEV_PM_OPS NULL
#endif
static struct platform_driver musb_driver = {
.driver = {
.name = musb_driver_name,
.bus = &platform_bus_type,
.pm = MUSB_DEV_PM_OPS,
.dev_groups = musb_groups,
},
.probe = musb_probe,
.remove = musb_remove,
};
module_platform_driver(musb_driver);
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