// SPDX-License-Identifier: GPL-2.0
/*
* TUSB6010 USB 2.0 OTG Dual Role controller
*
* Copyright (C) 2006 Nokia Corporation
* Tony Lindgren <[email protected]>
*
* Notes:
* - Driver assumes that interface to external host (main CPU) is
* configured for NOR FLASH interface instead of VLYNQ serial
* interface.
*/
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/prefetch.h>
#include <linux/usb.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/usb_phy_generic.h>
#include "musb_core.h"
struct tusb6010_glue {
struct device *dev;
struct platform_device *musb;
struct platform_device *phy;
struct gpio_desc *enable;
struct gpio_desc *intpin;
};
static void tusb_musb_set_vbus(struct musb *musb, int is_on);
#define TUSB_REV_MAJOR(reg_val) ((reg_val >> 4) & 0xf)
#define TUSB_REV_MINOR(reg_val) (reg_val & 0xf)
/*
* Checks the revision. We need to use the DMA register as 3.0 does not
* have correct versions for TUSB_PRCM_REV or TUSB_INT_CTRL_REV.
*/
static u8 tusb_get_revision(struct musb *musb)
{
void __iomem *tbase = musb->ctrl_base;
u32 die_id;
u8 rev;
rev = musb_readl(tbase, TUSB_DMA_CTRL_REV) & 0xff;
if (TUSB_REV_MAJOR(rev) == 3) {
die_id = TUSB_DIDR1_HI_CHIP_REV(musb_readl(tbase,
TUSB_DIDR1_HI));
if (die_id >= TUSB_DIDR1_HI_REV_31)
rev |= 1;
}
return rev;
}
static void tusb_print_revision(struct musb *musb)
{
void __iomem *tbase = musb->ctrl_base;
u8 rev;
rev = musb->tusb_revision;
pr_info("tusb: %s%i.%i %s%i.%i %s%i.%i %s%i.%i %s%i %s%i.%i\n",
"prcm",
TUSB_REV_MAJOR(musb_readl(tbase, TUSB_PRCM_REV)),
TUSB_REV_MINOR(musb_readl(tbase, TUSB_PRCM_REV)),
"int",
TUSB_REV_MAJOR(musb_readl(tbase, TUSB_INT_CTRL_REV)),
TUSB_REV_MINOR(musb_readl(tbase, TUSB_INT_CTRL_REV)),
"gpio",
TUSB_REV_MAJOR(musb_readl(tbase, TUSB_GPIO_REV)),
TUSB_REV_MINOR(musb_readl(tbase, TUSB_GPIO_REV)),
"dma",
TUSB_REV_MAJOR(musb_readl(tbase, TUSB_DMA_CTRL_REV)),
TUSB_REV_MINOR(musb_readl(tbase, TUSB_DMA_CTRL_REV)),
"dieid",
TUSB_DIDR1_HI_CHIP_REV(musb_readl(tbase, TUSB_DIDR1_HI)),
"rev",
TUSB_REV_MAJOR(rev), TUSB_REV_MINOR(rev));
}
#define WBUS_QUIRK_MASK (TUSB_PHY_OTG_CTRL_TESTM2 | TUSB_PHY_OTG_CTRL_TESTM1 \
| TUSB_PHY_OTG_CTRL_TESTM0)
/*
* Workaround for spontaneous WBUS wake-up issue #2 for tusb3.0.
* Disables power detection in PHY for the duration of idle.
*/
static void tusb_wbus_quirk(struct musb *musb, int enabled)
{
void __iomem *tbase = musb->ctrl_base;
static u32 phy_otg_ctrl, phy_otg_ena;
u32 tmp;
if (enabled) {
phy_otg_ctrl = musb_readl(tbase, TUSB_PHY_OTG_CTRL);
phy_otg_ena = musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE);
tmp = TUSB_PHY_OTG_CTRL_WRPROTECT
| phy_otg_ena | WBUS_QUIRK_MASK;
musb_writel(tbase, TUSB_PHY_OTG_CTRL, tmp);
tmp = phy_otg_ena & ~WBUS_QUIRK_MASK;
tmp |= TUSB_PHY_OTG_CTRL_WRPROTECT | TUSB_PHY_OTG_CTRL_TESTM2;
musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, tmp);
dev_dbg(musb->controller, "Enabled tusb wbus quirk ctrl %08x ena %08x\n",
musb_readl(tbase, TUSB_PHY_OTG_CTRL),
musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE));
} else if (musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE)
& TUSB_PHY_OTG_CTRL_TESTM2) {
tmp = TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ctrl;
musb_writel(tbase, TUSB_PHY_OTG_CTRL, tmp);
tmp = TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ena;
musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, tmp);
dev_dbg(musb->controller, "Disabled tusb wbus quirk ctrl %08x ena %08x\n",
musb_readl(tbase, TUSB_PHY_OTG_CTRL),
musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE));
phy_otg_ctrl = 0;
phy_otg_ena = 0;
}
}
static u32 tusb_fifo_offset(u8 epnum)
{
return 0x200 + (epnum * 0x20);
}
static u32 tusb_ep_offset(u8 epnum, u16 offset)
{
return 0x10 + offset;
}
/* TUSB mapping: "flat" plus ep0 special cases */
static void tusb_ep_select(void __iomem *mbase, u8 epnum)
{
musb_writeb(mbase, MUSB_INDEX, epnum);
}
/*
* TUSB6010 doesn't allow 8-bit access; 16-bit access is the minimum.
*/
static u8 tusb_readb(void __iomem *addr, u32 offset)
{
u16 tmp;
u8 val;
tmp = __raw_readw(addr + (offset & ~1));
if (offset & 1)
val = (tmp >> 8);
else
val = tmp & 0xff;
return val;
}
static void tusb_writeb(void __iomem *addr, u32 offset, u8 data)
{
u16 tmp;
tmp = __raw_readw(addr + (offset & ~1));
if (offset & 1)
tmp = (data << 8) | (tmp & 0xff);
else
tmp = (tmp & 0xff00) | data;
__raw_writew(tmp, addr + (offset & ~1));
}
/*
* TUSB 6010 may use a parallel bus that doesn't support byte ops;
* so both loading and unloading FIFOs need explicit byte counts.
*/
static inline void
tusb_fifo_write_unaligned(void __iomem *fifo, const u8 *buf, u16 len)
{
u32 val;
int i;
if (len > 4) {
for (i = 0; i < (len >> 2); i++) {
memcpy(&val, buf, 4);
musb_writel(fifo, 0, val);
buf += 4;
}
len %= 4;
}
if (len > 0) {
/* Write the rest 1 - 3 bytes to FIFO */
val = 0;
memcpy(&val, buf, len);
musb_writel(fifo, 0, val);
}
}
static inline void tusb_fifo_read_unaligned(void __iomem *fifo,
void *buf, u16 len)
{
u32 val;
int i;
if (len > 4) {
for (i = 0; i < (len >> 2); i++) {
val = musb_readl(fifo, 0);
memcpy(buf, &val, 4);
buf += 4;
}
len %= 4;
}
if (len > 0) {
/* Read the rest 1 - 3 bytes from FIFO */
val = musb_readl(fifo, 0);
memcpy(buf, &val, len);
}
}
static void tusb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf)
{
struct musb *musb = hw_ep->musb;
void __iomem *ep_conf = hw_ep->conf;
void __iomem *fifo = hw_ep->fifo;
u8 epnum = hw_ep->epnum;
prefetch(buf);
dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
'T', epnum, fifo, len, buf);
if (epnum)
musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
TUSB_EP_CONFIG_XFR_SIZE(len));
else
musb_writel(ep_conf, 0, TUSB_EP0_CONFIG_DIR_TX |
TUSB_EP0_CONFIG_XFR_SIZE(len));
if (likely((0x01 & (unsigned long) buf) == 0)) {
/* Best case is 32bit-aligned destination address */
if ((0x02 & (unsigned long) buf) == 0) {
if (len >= 4) {
iowrite32_rep(fifo, buf, len >> 2);
buf += (len & ~0x03);
len &= 0x03;
}
} else {
if (len >= 2) {
u32 val;
int i;
/* Cannot use writesw, fifo is 32-bit */
for (i = 0; i < (len >> 2); i++) {
val = (u32)(*(u16 *)buf);
buf += 2;
val |= (*(u16 *)buf) << 16;
buf += 2;
musb_writel(fifo, 0, val);
}
len &= 0x03;
}
}
}
if (len > 0)
tusb_fifo_write_unaligned(fifo, buf, len);
}
static void tusb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *buf)
{
struct musb *musb = hw_ep->musb;
void __iomem *ep_conf = hw_ep->conf;
void __iomem *fifo = hw_ep->fifo;
u8 epnum = hw_ep->epnum;
dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
'R', epnum, fifo, len, buf);
if (epnum)
musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
TUSB_EP_CONFIG_XFR_SIZE(len));
else
musb_writel(ep_conf, 0, TUSB_EP0_CONFIG_XFR_SIZE(len));
if (likely((0x01 & (unsigned long) buf) == 0)) {
/* Best case is 32bit-aligned destination address */
if ((0x02 & (unsigned long) buf) == 0) {
if (len >= 4) {
ioread32_rep(fifo, buf, len >> 2);
buf += (len & ~0x03);
len &= 0x03;
}
} else {
if (len >= 2) {
u32 val;
int i;
/* Cannot use readsw, fifo is 32-bit */
for (i = 0; i < (len >> 2); i++) {
val = musb_readl(fifo, 0);
*(u16 *)buf = (u16)(val & 0xffff);
buf += 2;
*(u16 *)buf = (u16)(val >> 16);
buf += 2;
}
len &= 0x03;
}
}
}
if (len > 0)
tusb_fifo_read_unaligned(fifo, buf, len);
}
static struct musb *the_musb;
/* This is used by gadget drivers, and OTG transceiver logic, allowing
* at most mA current to be drawn from VBUS during a Default-B session
* (that is, while VBUS exceeds 4.4V). In Default-A (including pure host
* mode), or low power Default-B sessions, something else supplies power.
* Caller must take care of locking.
*/
static int tusb_draw_power(struct usb_phy *x, unsigned mA)
{
struct musb *musb = the_musb;
void __iomem *tbase = musb->ctrl_base;
u32 reg;
/* tps65030 seems to consume max 100mA, with maybe 60mA available
* (measured on one board) for things other than tps and tusb.
*
* Boards sharing the CPU clock with CLKIN will need to prevent
* certain idle sleep states while the USB link is active.
*
* REVISIT we could use VBUS to supply only _one_ of { 1.5V, 3.3V }.
* The actual current usage would be very board-specific. For now,
* it's simpler to just use an aggregate (also board-specific).
*/
if (x->otg->default_a || mA < (musb->min_power << 1))
mA = 0;
reg = musb_readl(tbase, TUSB_PRCM_MNGMT);
if (mA) {
musb->is_bus_powered = 1;
reg |= TUSB_PRCM_MNGMT_15_SW_EN | TUSB_PRCM_MNGMT_33_SW_EN;
} else {
musb->is_bus_powered = 0;
reg &= ~(TUSB_PRCM_MNGMT_15_SW_EN | TUSB_PRCM_MNGMT_33_SW_EN);
}
musb_writel(tbase, TUSB_PRCM_MNGMT, reg);
dev_dbg(musb->controller, "draw max %d mA VBUS\n", mA);
return 0;
}
/* workaround for issue 13: change clock during chip idle
* (to be fixed in rev3 silicon) ... symptoms include disconnect
* or looping suspend/resume cycles
*/
static void tusb_set_clock_source(struct musb *musb, unsigned mode)
{
void __iomem *tbase = musb->ctrl_base;
u32 reg;
reg = musb_readl(tbase, TUSB_PRCM_CONF);
reg &= ~TUSB_PRCM_CONF_SYS_CLKSEL(0x3);
/* 0 = refclk (clkin, XI)
* 1 = PHY 60 MHz (internal PLL)
* 2 = not supported
* 3 = what?
*/
if (mode > 0)
reg |= TUSB_PRCM_CONF_SYS_CLKSEL(mode & 0x3);
musb_writel(tbase, TUSB_PRCM_CONF, reg);
/* FIXME tusb6010_platform_retime(mode == 0); */
}
/*
* Idle TUSB6010 until next wake-up event; NOR access always wakes.
* Other code ensures that we idle unless we're connected _and_ the
* USB link is not suspended ... and tells us the relevant wakeup
* events. SW_EN for voltage is handled separately.
*/
static void tusb_allow_idle(struct musb *musb, u32 wakeup_enables)
{
void __iomem *tbase = musb->ctrl_base;
u32 reg;
if ((wakeup_enables & TUSB_PRCM_WBUS)
&& (musb->tusb_revision == TUSB_REV_30))
tusb_wbus_quirk(musb, 1);
tusb_set_clock_source(musb, 0);
wakeup_enables |= TUSB_PRCM_WNORCS;
musb_writel(tbase, TUSB_PRCM_WAKEUP_MASK, ~wakeup_enables);
/* REVISIT writeup of WID implies that if WID set and ID is grounded,
* TUSB_PHY_OTG_CTRL.TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP must be cleared.
* Presumably that's mostly to save power, hence WID is immaterial ...
*/
reg = musb_readl(tbase, TUSB_PRCM_MNGMT);
/* issue 4: when driving vbus, use hipower (vbus_det) comparator */
if (is_host_active(musb)) {
reg |= TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN;
reg &= ~TUSB_PRCM_MNGMT_OTG_SESS_END_EN;
} else {
reg |= TUSB_PRCM_MNGMT_OTG_SESS_END_EN;
reg &= ~TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN;
}
reg |= TUSB_PRCM_MNGMT_PM_IDLE | TUSB_PRCM_MNGMT_DEV_IDLE;
musb_writel(tbase, TUSB_PRCM_MNGMT, reg);
dev_dbg(musb->controller, "idle, wake on %02x\n", wakeup_enables);
}
/*
* Updates cable VBUS status. Caller must take care of locking.
*/
static int tusb_musb_vbus_status(struct musb *musb)
{
void __iomem *tbase = musb->ctrl_base;
u32 otg_stat, prcm_mngmt;
int ret = 0;
otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
prcm_mngmt = musb_readl(tbase, TUSB_PRCM_MNGMT);
/* Temporarily enable VBUS detection if it was disabled for
* suspend mode. Unless it's enabled otg_stat and devctl will
* not show correct VBUS state.
*/
if (!(prcm_mngmt & TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN)) {
u32 tmp = prcm_mngmt;
tmp |= TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN;
musb_writel(tbase, TUSB_PRCM_MNGMT, tmp);
otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
musb_writel(tbase, TUSB_PRCM_MNGMT, prcm_mngmt);
}
if (otg_stat & TUSB_DEV_OTG_STAT_VBUS_VALID)
ret = 1;
return ret;
}
static void musb_do_idle(struct timer_list *t)
{
struct musb *musb = from_timer(musb, t, dev_timer);
unsigned long flags;
spin_lock_irqsave(&musb->lock, flags);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_WAIT_BCON:
if ((musb->a_wait_bcon != 0)
&& (musb->idle_timeout == 0
|| time_after(jiffies, musb->idle_timeout))) {
dev_dbg(musb->controller, "Nothing connected %s, turning off VBUS\n",
usb_otg_state_string(musb->xceiv->otg->state));
}
fallthrough;
case OTG_STATE_A_IDLE:
tusb_musb_set_vbus(musb, 0);
break;
default:
break;
}
if (!musb->is_active) {
u32 wakeups;
/* wait until hub_wq handles port change status */
if (is_host_active(musb) && (musb->port1_status >> 16))
goto done;
if (!musb->gadget_driver) {
wakeups = 0;
} else {
wakeups = TUSB_PRCM_WHOSTDISCON
| TUSB_PRCM_WBUS
| TUSB_PRCM_WVBUS;
wakeups |= TUSB_PRCM_WID;
}
tusb_allow_idle(musb, wakeups);
}
done:
spin_unlock_irqrestore(&musb->lock, flags);
}
/*
* Maybe put TUSB6010 into idle mode depending on USB link status,
* like "disconnected" or "suspended". We'll be woken out of it by
* connect, resume, or disconnect.
*
* Needs to be called as the last function everywhere where there is
* register access to TUSB6010 because of NOR flash wake-up.
* Caller should own controller spinlock.
*
* Delay because peripheral enables D+ pullup 3msec after SE0, and
* we don't want to treat that full speed J as a wakeup event.
* ... peripherals must draw only suspend current after 10 msec.
*/
static void tusb_musb_try_idle(struct musb *musb, unsigned long timeout)
{
unsigned long default_timeout = jiffies + msecs_to_jiffies(3);
static unsigned long last_timer;
if (timeout == 0)
timeout = default_timeout;
/* 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(&musb->dev_timer);
last_timer = jiffies;
return;
}
if (time_after(last_timer, timeout)) {
if (!timer_pending(&musb->dev_timer))
last_timer = timeout;
else {
dev_dbg(musb->controller, "Longer idle timer already pending, ignoring\n");
return;
}
}
last_timer = timeout;
dev_dbg(musb->controller, "%s inactive, for idle timer for %lu ms\n",
usb_otg_state_string(musb->xceiv->otg->state),
(unsigned long)jiffies_to_msecs(timeout - jiffies));
mod_timer(&musb->dev_timer, timeout);
}
/* ticks of 60 MHz clock */
#define DEVCLOCK 60000000
#define OTG_TIMER_MS(msecs) ((msecs) \
? (TUSB_DEV_OTG_TIMER_VAL((DEVCLOCK/1000)*(msecs)) \
| TUSB_DEV_OTG_TIMER_ENABLE) \
: 0)
static void tusb_musb_set_vbus(struct musb *musb, int is_on)
{
void __iomem *tbase = musb->ctrl_base;
u32 conf, prcm, timer;
u8 devctl;
struct usb_otg *otg = musb->xceiv->otg;
/* HDRC controls CPEN, but beware current surges during device
* connect. They can trigger transient overcurrent conditions
* that must be ignored.
*/
prcm = musb_readl(tbase, TUSB_PRCM_MNGMT);
conf = musb_readl(tbase, TUSB_DEV_CONF);
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (is_on) {
timer = OTG_TIMER_MS(OTG_TIME_A_WAIT_VRISE);
otg->default_a = 1;
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
devctl |= MUSB_DEVCTL_SESSION;
conf |= TUSB_DEV_CONF_USB_HOST_MODE;
MUSB_HST_MODE(musb);
} else {
u32 otg_stat;
timer = 0;
/* If ID pin is grounded, we want to be a_idle */
otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
if (!(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS)) {
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_WAIT_VRISE:
case OTG_STATE_A_WAIT_BCON:
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
break;
case OTG_STATE_A_WAIT_VFALL:
musb->xceiv->otg->state = OTG_STATE_A_IDLE;
break;
default:
musb->xceiv->otg->state = OTG_STATE_A_IDLE;
}
musb->is_active = 0;
otg->default_a = 1;
MUSB_HST_MODE(musb);
} else {
musb->is_active = 0;
otg->default_a = 0;
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
MUSB_DEV_MODE(musb);
}
devctl &= ~MUSB_DEVCTL_SESSION;
conf &= ~TUSB_DEV_CONF_USB_HOST_MODE;
}
prcm &= ~(TUSB_PRCM_MNGMT_15_SW_EN | TUSB_PRCM_MNGMT_33_SW_EN);
musb_writel(tbase, TUSB_PRCM_MNGMT, prcm);
musb_writel(tbase, TUSB_DEV_OTG_TIMER, timer);
musb_writel(tbase, TUSB_DEV_CONF, conf);
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
dev_dbg(musb->controller, "VBUS %s, devctl %02x otg %3x conf %08x prcm %08x\n",
usb_otg_state_string(musb->xceiv->otg->state),
musb_readb(musb->mregs, MUSB_DEVCTL),
musb_readl(tbase, TUSB_DEV_OTG_STAT),
conf, prcm);
}
/*
* Sets the mode to OTG, peripheral or host by changing the ID detection.
* Caller must take care of locking.
*
* Note that if a mini-A cable is plugged in the ID line will stay down as
* the weak ID pull-up is not able to pull the ID up.
*/
static int tusb_musb_set_mode(struct musb *musb, u8 musb_mode)
{
void __iomem *tbase = musb->ctrl_base;
u32 otg_stat, phy_otg_ctrl, phy_otg_ena, dev_conf;
otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
phy_otg_ctrl = musb_readl(tbase, TUSB_PHY_OTG_CTRL);
phy_otg_ena = musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE);
dev_conf = musb_readl(tbase, TUSB_DEV_CONF);
switch (musb_mode) {
case MUSB_HOST: /* Disable PHY ID detect, ground ID */
phy_otg_ctrl &= ~TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
phy_otg_ena |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
dev_conf |= TUSB_DEV_CONF_ID_SEL;
dev_conf &= ~TUSB_DEV_CONF_SOFT_ID;
break;
case MUSB_PERIPHERAL: /* Disable PHY ID detect, keep ID pull-up on */
phy_otg_ctrl |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
phy_otg_ena |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
dev_conf |= (TUSB_DEV_CONF_ID_SEL | TUSB_DEV_CONF_SOFT_ID);
break;
case MUSB_OTG: /* Use PHY ID detection */
phy_otg_ctrl |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
phy_otg_ena |= TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
dev_conf &= ~(TUSB_DEV_CONF_ID_SEL | TUSB_DEV_CONF_SOFT_ID);
break;
default:
dev_dbg(musb->controller, "Trying to set mode %i\n", musb_mode);
return -EINVAL;
}
musb_writel(tbase, TUSB_PHY_OTG_CTRL,
TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ctrl);
musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE,
TUSB_PHY_OTG_CTRL_WRPROTECT | phy_otg_ena);
musb_writel(tbase, TUSB_DEV_CONF, dev_conf);
otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
if ((musb_mode == MUSB_PERIPHERAL) &&
!(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS))
INFO("Cannot be peripheral with mini-A cable "
"otg_stat: %08x\n", otg_stat);
return 0;
}
static inline unsigned long
tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
{
u32 otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
unsigned long idle_timeout = 0;
struct usb_otg *otg = musb->xceiv->otg;
/* ID pin */
if ((int_src & TUSB_INT_SRC_ID_STATUS_CHNG)) {
int default_a;
default_a = !(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS);
dev_dbg(musb->controller, "Default-%c\n", default_a ? 'A' : 'B');
otg->default_a = default_a;
tusb_musb_set_vbus(musb, default_a);
/* Don't allow idling immediately */
if (default_a)
idle_timeout = jiffies + (HZ * 3);
}
/* VBUS state change */
if (int_src & TUSB_INT_SRC_VBUS_SENSE_CHNG) {
/* B-dev state machine: no vbus ~= disconnect */
if (!otg->default_a) {
/* ? musb_root_disconnect(musb); */
musb->port1_status &=
~(USB_PORT_STAT_CONNECTION
| USB_PORT_STAT_ENABLE
| USB_PORT_STAT_LOW_SPEED
| USB_PORT_STAT_HIGH_SPEED
| USB_PORT_STAT_TEST
);
if (otg_stat & TUSB_DEV_OTG_STAT_SESS_END) {
dev_dbg(musb->controller, "Forcing disconnect (no interrupt)\n");
if (musb->xceiv->otg->state != OTG_STATE_B_IDLE) {
/* INTR_DISCONNECT can hide... */
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
musb->int_usb |= MUSB_INTR_DISCONNECT;
}
musb->is_active = 0;
}
dev_dbg(musb->controller, "vbus change, %s, otg %03x\n",
usb_otg_state_string(musb->xceiv->otg->state), otg_stat);
idle_timeout = jiffies + (1 * HZ);
schedule_delayed_work(&musb->irq_work, 0);
} else /* A-dev state machine */ {
dev_dbg(musb->controller, "vbus change, %s, otg %03x\n",
usb_otg_state_string(musb->xceiv->otg->state), otg_stat);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_IDLE:
dev_dbg(musb->controller, "Got SRP, turning on VBUS\n");
musb_platform_set_vbus(musb, 1);
/* CONNECT can wake if a_wait_bcon is set */
if (musb->a_wait_bcon != 0)
musb->is_active = 0;
else
musb->is_active = 1;
/*
* OPT FS A TD.4.6 needs few seconds for
* A_WAIT_VRISE
*/
idle_timeout = jiffies + (2 * HZ);
break;
case OTG_STATE_A_WAIT_VRISE:
/* ignore; A-session-valid < VBUS_VALID/2,
* we monitor this with the timer
*/
break;
case OTG_STATE_A_WAIT_VFALL:
/* REVISIT this irq triggers during short
* spikes caused by enumeration ...
*/
if (musb->vbuserr_retry) {
musb->vbuserr_retry--;
tusb_musb_set_vbus(musb, 1);
} else {
musb->vbuserr_retry
= VBUSERR_RETRY_COUNT;
tusb_musb_set_vbus(musb, 0);
}
break;
default:
break;
}
}
}
/* OTG timer expiration */
if (int_src & TUSB_INT_SRC_OTG_TIMEOUT) {
u8 devctl;
dev_dbg(musb->controller, "%s timer, %03x\n",
usb_otg_state_string(musb->xceiv->otg->state), otg_stat);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_WAIT_VRISE:
/* VBUS has probably been valid for a while now,
* but may well have bounced out of range a bit
*/
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (otg_stat & TUSB_DEV_OTG_STAT_VBUS_VALID) {
if ((devctl & MUSB_DEVCTL_VBUS)
!= MUSB_DEVCTL_VBUS) {
dev_dbg(musb->controller, "devctl %02x\n", devctl);
break;
}
musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
musb->is_active = 0;
idle_timeout = jiffies
+ msecs_to_jiffies(musb->a_wait_bcon);
} else {
/* REVISIT report overcurrent to hub? */
ERR("vbus too slow, devctl %02x\n", devctl);
tusb_musb_set_vbus(musb, 0);
}
break;
case OTG_STATE_A_WAIT_BCON:
if (musb->a_wait_bcon != 0)
idle_timeout = jiffies
+ msecs_to_jiffies(musb->a_wait_bcon);
break;
case OTG_STATE_A_SUSPEND:
break;
case OTG_STATE_B_WAIT_ACON:
break;
default:
break;
}
}
schedule_delayed_work(&musb->irq_work, 0);
return idle_timeout;
}
static irqreturn_t tusb_musb_interrupt(int irq, void *__hci)
{
struct musb *musb = __hci;
void __iomem *tbase = musb->ctrl_base;
unsigned long flags, idle_timeout = 0;
u32 int_mask, int_src;
spin_lock_irqsave(&musb->lock, flags);
/* Mask all interrupts to allow using both edge and level GPIO irq */
int_mask = musb_readl(tbase, TUSB_INT_MASK);
musb_writel(tbase, TUSB_INT_MASK, ~TUSB_INT_MASK_RESERVED_BITS);
int_src = musb_readl(tbase, TUSB_INT_SRC) & ~TUSB_INT_SRC_RESERVED_BITS;
dev_dbg(musb->controller, "TUSB IRQ %08x\n", int_src);
musb->int_usb = (u8) int_src;
/* Acknowledge wake-up source interrupts */
if (int_src & TUSB_INT_SRC_DEV_WAKEUP) {
u32 reg;
u32 i;
if (musb->tusb_revision == TUSB_REV_30)
tusb_wbus_quirk(musb, 0);
/* there are issues re-locking the PLL on wakeup ... */
/* work around issue 8 */
for (i = 0xf7f7f7; i > 0xf7f7f7 - 1000; i--) {
musb_writel(tbase, TUSB_SCRATCH_PAD, 0);
musb_writel(tbase, TUSB_SCRATCH_PAD, i);
reg = musb_readl(tbase, TUSB_SCRATCH_PAD);
if (reg == i)
break;
dev_dbg(musb->controller, "TUSB NOR not ready\n");
}
/* work around issue 13 (2nd half) */
tusb_set_clock_source(musb, 1);
reg = musb_readl(tbase, TUSB_PRCM_WAKEUP_SOURCE);
musb_writel(tbase, TUSB_PRCM_WAKEUP_CLEAR, reg);
if (reg & ~TUSB_PRCM_WNORCS) {
musb->is_active = 1;
schedule_delayed_work(&musb->irq_work, 0);
}
dev_dbg(musb->controller, "wake %sactive %02x\n",
musb->is_active ? "" : "in", reg);
/* REVISIT host side TUSB_PRCM_WHOSTDISCON, TUSB_PRCM_WBUS */
}
if (int_src & TUSB_INT_SRC_USB_IP_CONN)
del_timer(&musb->dev_timer);
/* OTG state change reports (annoyingly) not issued by Mentor core */
if (int_src & (TUSB_INT_SRC_VBUS_SENSE_CHNG
| TUSB_INT_SRC_OTG_TIMEOUT
| TUSB_INT_SRC_ID_STATUS_CHNG))
idle_timeout = tusb_otg_ints(musb, int_src, tbase);
/*
* Just clear the DMA interrupt if it comes as the completion for both
* TX and RX is handled by the DMA callback in tusb6010_omap
*/
if ((int_src & TUSB_INT_SRC_TXRX_DMA_DONE)) {
u32 dma_src = musb_readl(tbase, TUSB_DMA_INT_SRC);
dev_dbg(musb->controller, "DMA IRQ %08x\n", dma_src);
musb_writel(tbase, TUSB_DMA_INT_CLEAR, dma_src);
}
/* EP interrupts. In OCP mode tusb6010 mirrors the MUSB interrupts */
if (int_src & (TUSB_INT_SRC_USB_IP_TX | TUSB_INT_SRC_USB_IP_RX)) {
u32 musb_src = musb_readl(tbase, TUSB_USBIP_INT_SRC);
musb_writel(tbase, TUSB_USBIP_INT_CLEAR, musb_src);
musb->int_rx = (((musb_src >> 16) & 0xffff) << 1);
musb->int_tx = (musb_src & 0xffff);
} else {
musb->int_rx = 0;
musb->int_tx = 0;
}
if (int_src & (TUSB_INT_SRC_USB_IP_TX | TUSB_INT_SRC_USB_IP_RX | 0xff))
musb_interrupt(musb);
/* Acknowledge TUSB interrupts. Clear only non-reserved bits */
musb_writel(tbase, TUSB_INT_SRC_CLEAR,
int_src & ~TUSB_INT_MASK_RESERVED_BITS);
tusb_musb_try_idle(musb, idle_timeout);
musb_writel(tbase, TUSB_INT_MASK, int_mask);
spin_unlock_irqrestore(&musb->lock, flags);
return IRQ_HANDLED;
}
static int dma_off;
/*
* Enables TUSB6010. Caller must take care of locking.
* REVISIT:
* - Check what is unnecessary in MGC_HdrcStart()
*/
static void tusb_musb_enable(struct musb *musb)
{
void __iomem *tbase = musb->ctrl_base;
/* Setup TUSB6010 main interrupt mask. Enable all interrupts except SOF.
* REVISIT: Enable and deal with TUSB_INT_SRC_USB_IP_SOF */
musb_writel(tbase, TUSB_INT_MASK, TUSB_INT_SRC_USB_IP_SOF);
/* Setup TUSB interrupt, disable DMA and GPIO interrupts */
musb_writel(tbase, TUSB_USBIP_INT_MASK, 0);
musb_writel(tbase, TUSB_DMA_INT_MASK, 0x7fffffff);
musb_writel(tbase, TUSB_GPIO_INT_MASK, 0x1ff);
/* Clear all subsystem interrups */
musb_writel(tbase, TUSB_USBIP_INT_CLEAR, 0x7fffffff);
musb_writel(tbase, TUSB_DMA_INT_CLEAR, 0x7fffffff);
musb_writel(tbase, TUSB_GPIO_INT_CLEAR, 0x1ff);
/* Acknowledge pending interrupt(s) */
musb_writel(tbase, TUSB_INT_SRC_CLEAR, ~TUSB_INT_MASK_RESERVED_BITS);
/* Only 0 clock cycles for minimum interrupt de-assertion time and
* interrupt polarity active low seems to work reliably here */
musb_writel(tbase, TUSB_INT_CTRL_CONF,
TUSB_INT_CTRL_CONF_INT_RELCYC(0));
irq_set_irq_type(musb->nIrq, IRQ_TYPE_LEVEL_LOW);
/* maybe force into the Default-A OTG state machine */
if (!(musb_readl(tbase, TUSB_DEV_OTG_STAT)
& TUSB_DEV_OTG_STAT_ID_STATUS))
musb_writel(tbase, TUSB_INT_SRC_SET,
TUSB_INT_SRC_ID_STATUS_CHNG);
if (is_dma_capable() && dma_off)
printk(KERN_WARNING "%s %s: dma not reactivated\n",
__FILE__, __func__);
else
dma_off = 1;
}
/*
* Disables TUSB6010. Caller must take care of locking.
*/
static void tusb_musb_disable(struct musb *musb)
{
void __iomem *tbase = musb->ctrl_base;
/* FIXME stop DMA, IRQs, timers, ... */
/* disable all IRQs */
musb_writel(tbase, TUSB_INT_MASK, ~TUSB_INT_MASK_RESERVED_BITS);
musb_writel(tbase, TUSB_USBIP_INT_MASK, 0x7fffffff);
musb_writel(tbase, TUSB_DMA_INT_MASK, 0x7fffffff);
musb_writel(tbase, TUSB_GPIO_INT_MASK, 0x1ff);
del_timer(&musb->dev_timer);
if (is_dma_capable() && !dma_off) {
printk(KERN_WARNING "%s %s: dma still active\n",
__FILE__, __func__);
dma_off = 1;
}
}
/*
* Sets up TUSB6010 CPU interface specific signals and registers
* Note: Settings optimized for OMAP24xx
*/
static void tusb_setup_cpu_interface(struct musb *musb)
{
void __iomem *tbase = musb->ctrl_base;
/*
* Disable GPIO[5:0] pullups (used as output DMA requests)
* Don't disable GPIO[7:6] as they are needed for wake-up.
*/
musb_writel(tbase, TUSB_PULLUP_1_CTRL, 0x0000003F);
/* Disable all pullups on NOR IF, DMAREQ0 and DMAREQ1 */
musb_writel(tbase, TUSB_PULLUP_2_CTRL, 0x01FFFFFF);
/* Turn GPIO[5:0] to DMAREQ[5:0] signals */
musb_writel(tbase, TUSB_GPIO_CONF, TUSB_GPIO_CONF_DMAREQ(0x3f));
/* Burst size 16x16 bits, all six DMA requests enabled, DMA request
* de-assertion time 2 system clocks p 62 */
musb_writel(tbase, TUSB_DMA_REQ_CONF,
TUSB_DMA_REQ_CONF_BURST_SIZE(2) |
TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f) |
TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2));
/* Set 0 wait count for synchronous burst access */
musb_writel(tbase, TUSB_WAIT_COUNT, 1);
}
static int tusb_musb_start(struct musb *musb)
{
struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
void __iomem *tbase = musb->ctrl_base;
unsigned long flags;
u32 reg;
int ret;
/*
* Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
* 1.5 V voltage regulators of PM companion chip. Companion chip will then
* provide then PGOOD signal to TUSB6010 which will release it from reset.
*/
gpiod_set_value(glue->enable, 1);
/* Wait for 100ms until TUSB6010 pulls INT pin down */
ret = read_poll_timeout(gpiod_get_value, reg, !reg, 5000, 100000, true,
glue->intpin);
if (ret) {
pr_err("tusb: Powerup response failed\n");
return ret;
}
spin_lock_irqsave(&musb->lock, flags);
if (musb_readl(tbase, TUSB_PROD_TEST_RESET) !=
TUSB_PROD_TEST_RESET_VAL) {
printk(KERN_ERR "tusb: Unable to detect TUSB6010\n");
goto err;
}
musb->tusb_revision = tusb_get_revision(musb);
tusb_print_revision(musb);
if (musb->tusb_revision < 2) {
printk(KERN_ERR "tusb: Unsupported TUSB6010 revision %i\n",
musb->tusb_revision);
goto err;
}
/* The uint bit for "USB non-PDR interrupt enable" has to be 1 when
* NOR FLASH interface is used */
musb_writel(tbase, TUSB_VLYNQ_CTRL, 8);
/* Select PHY free running 60MHz as a system clock */
tusb_set_clock_source(musb, 1);
/* VBus valid timer 1us, disable DFT/Debug and VLYNQ clocks for
* power saving, enable VBus detect and session end comparators,
* enable IDpullup, enable VBus charging */
musb_writel(tbase, TUSB_PRCM_MNGMT,
TUSB_PRCM_MNGMT_VBUS_VALID_TIMER(0xa) |
TUSB_PRCM_MNGMT_VBUS_VALID_FLT_EN |
TUSB_PRCM_MNGMT_OTG_SESS_END_EN |
TUSB_PRCM_MNGMT_OTG_VBUS_DET_EN |
TUSB_PRCM_MNGMT_OTG_ID_PULLUP);
tusb_setup_cpu_interface(musb);
/* simplify: always sense/pullup ID pins, as if in OTG mode */
reg = musb_readl(tbase, TUSB_PHY_OTG_CTRL_ENABLE);
reg |= TUSB_PHY_OTG_CTRL_WRPROTECT | TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
musb_writel(tbase, TUSB_PHY_OTG_CTRL_ENABLE, reg);
reg = musb_readl(tbase, TUSB_PHY_OTG_CTRL);
reg |= TUSB_PHY_OTG_CTRL_WRPROTECT | TUSB_PHY_OTG_CTRL_OTG_ID_PULLUP;
musb_writel(tbase, TUSB_PHY_OTG_CTRL, reg);
spin_unlock_irqrestore(&musb->lock, flags);
return 0;
err:
spin_unlock_irqrestore(&musb->lock, flags);
gpiod_set_value(glue->enable, 0);
msleep(10);
return -ENODEV;
}
static int tusb_musb_init(struct musb *musb)
{
struct platform_device *pdev;
struct resource *mem;
void __iomem *sync = NULL;
int ret;
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(musb->xceiv))
return -EPROBE_DEFER;
pdev = to_platform_device(musb->controller);
/* dma address for async dma */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
pr_debug("no async dma resource?\n");
ret = -ENODEV;
goto done;
}
musb->async = mem->start;
/* dma address for sync dma */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!mem) {
pr_debug("no sync dma resource?\n");
ret = -ENODEV;
goto done;
}
musb->sync = mem->start;
sync = ioremap(mem->start, resource_size(mem));
if (!sync) {
pr_debug("ioremap for sync failed\n");
ret = -ENOMEM;
goto done;
}
musb->sync_va = sync;
/* Offsets from base: VLYNQ at 0x000, MUSB regs at 0x400,
* FIFOs at 0x600, TUSB at 0x800
*/
musb->mregs += TUSB_BASE_OFFSET;
ret = tusb_musb_start(musb);
if (ret) {
printk(KERN_ERR "Could not start tusb6010 (%d)\n",
ret);
goto done;
}
musb->isr = tusb_musb_interrupt;
musb->xceiv->set_power = tusb_draw_power;
the_musb = musb;
timer_setup(&musb->dev_timer, musb_do_idle, 0);
done:
if (ret < 0) {
if (sync)
iounmap(sync);
usb_put_phy(musb->xceiv);
}
return ret;
}
static int tusb_musb_exit(struct musb *musb)
{
struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
del_timer_sync(&musb->dev_timer);
the_musb = NULL;
gpiod_set_value(glue->enable, 0);
msleep(10);
iounmap(musb->sync_va);
usb_put_phy(musb->xceiv);
return 0;
}
static const struct musb_platform_ops tusb_ops = {
.quirks = MUSB_DMA_TUSB_OMAP | MUSB_IN_TUSB |
MUSB_G_NO_SKB_RESERVE,
.init = tusb_musb_init,
.exit = tusb_musb_exit,
.ep_offset = tusb_ep_offset,
.ep_select = tusb_ep_select,
.fifo_offset = tusb_fifo_offset,
.readb = tusb_readb,
.writeb = tusb_writeb,
.read_fifo = tusb_read_fifo,
.write_fifo = tusb_write_fifo,
#ifdef CONFIG_USB_TUSB_OMAP_DMA
.dma_init = tusb_dma_controller_create,
.dma_exit = tusb_dma_controller_destroy,
#endif
.enable = tusb_musb_enable,
.disable = tusb_musb_disable,
.set_mode = tusb_musb_set_mode,
.try_idle = tusb_musb_try_idle,
.vbus_status = tusb_musb_vbus_status,
.set_vbus = tusb_musb_set_vbus,
};
static const struct platform_device_info tusb_dev_info = {
.name = "musb-hdrc",
.id = PLATFORM_DEVID_AUTO,
.dma_mask = DMA_BIT_MASK(32),
};
static int tusb_probe(struct platform_device *pdev)
{
struct resource musb_resources[3];
struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct platform_device *musb;
struct tusb6010_glue *glue;
struct platform_device_info pinfo;
int ret;
glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
if (!glue)
return -ENOMEM;
glue->dev = &pdev->dev;
glue->enable = devm_gpiod_get(glue->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(glue->enable))
return dev_err_probe(glue->dev, PTR_ERR(glue->enable),
"could not obtain power on/off GPIO\n");
glue->intpin = devm_gpiod_get(glue->dev, "int", GPIOD_IN);
if (IS_ERR(glue->intpin))
return dev_err_probe(glue->dev, PTR_ERR(glue->intpin),
"could not obtain INT GPIO\n");
pdata->platform_ops = &tusb_ops;
usb_phy_generic_register();
platform_set_drvdata(pdev, glue);
memset(musb_resources, 0x00, sizeof(*musb_resources) *
ARRAY_SIZE(musb_resources));
musb_resources[0].name = pdev->resource[0].name;
musb_resources[0].start = pdev->resource[0].start;
musb_resources[0].end = pdev->resource[0].end;
musb_resources[0].flags = pdev->resource[0].flags;
musb_resources[1].name = pdev->resource[1].name;
musb_resources[1].start = pdev->resource[1].start;
musb_resources[1].end = pdev->resource[1].end;
musb_resources[1].flags = pdev->resource[1].flags;
musb_resources[2] = DEFINE_RES_IRQ_NAMED(gpiod_to_irq(glue->intpin), "mc");
pinfo = tusb_dev_info;
pinfo.parent = &pdev->dev;
pinfo.res = musb_resources;
pinfo.num_res = ARRAY_SIZE(musb_resources);
pinfo.data = pdata;
pinfo.size_data = sizeof(*pdata);
glue->musb = musb = platform_device_register_full(&pinfo);
if (IS_ERR(musb)) {
ret = PTR_ERR(musb);
dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
return ret;
}
return 0;
}
static void tusb_remove(struct platform_device *pdev)
{
struct tusb6010_glue *glue = platform_get_drvdata(pdev);
platform_device_unregister(glue->musb);
usb_phy_generic_unregister(glue->phy);
}
static struct platform_driver tusb_driver = {
.probe = tusb_probe,
.remove_new = tusb_remove,
.driver = {
.name = "musb-tusb",
},
};
MODULE_DESCRIPTION("TUSB6010 MUSB Glue Layer");
MODULE_AUTHOR("Felipe Balbi <[email protected]>");
MODULE_LICENSE("GPL v2");
module_platform_driver(tusb_driver);
Codebase Browser
linux