musb: proper hookup to transceiver drivers
Let the otg_transceiver in MUSB be managed by an external driver;
don't assume it's integrated. OMAP3 chips need it to be external,
and there may be ways to interact with the transceiver which add
functionality to the system.
Platform init code is responsible for setting up the transeciver,
probably using the NOP transceiver for integrated transceivers.
External ones will use whatever the board init code provided,
such as twl4030 or something more hands-off.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 4ac1477..88b587c 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -259,6 +259,8 @@
tusb_fifo_read_unaligned(fifo, buf, len);
}
+static struct musb *the_musb;
+
#ifdef CONFIG_USB_GADGET_MUSB_HDRC
/* This is used by gadget drivers, and OTG transceiver logic, allowing
@@ -269,7 +271,7 @@
*/
static int tusb_draw_power(struct otg_transceiver *x, unsigned mA)
{
- struct musb *musb = container_of(x, struct musb, xceiv);
+ struct musb *musb = the_musb;
void __iomem *tbase = musb->ctrl_base;
u32 reg;
@@ -419,7 +421,7 @@
spin_lock_irqsave(&musb->lock, flags);
- switch (musb->xceiv.state) {
+ switch (musb->xceiv->state) {
case OTG_STATE_A_WAIT_BCON:
if ((musb->a_wait_bcon != 0)
&& (musb->idle_timeout == 0
@@ -483,7 +485,7 @@
/* Never idle if active, or when VBUS timeout is not set as host */
if (musb->is_active || ((musb->a_wait_bcon == 0)
- && (musb->xceiv.state == OTG_STATE_A_WAIT_BCON))) {
+ && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
del_timer(&musb_idle_timer);
last_timer = jiffies;
@@ -532,8 +534,8 @@
if (musb->set_clock)
musb->set_clock(musb->clock, 1);
timer = OTG_TIMER_MS(OTG_TIME_A_WAIT_VRISE);
- musb->xceiv.default_a = 1;
- musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+ musb->xceiv->default_a = 1;
+ musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
devctl |= MUSB_DEVCTL_SESSION;
conf |= TUSB_DEV_CONF_USB_HOST_MODE;
@@ -546,24 +548,24 @@
/* 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.state) {
+ switch (musb->xceiv->state) {
case OTG_STATE_A_WAIT_VRISE:
case OTG_STATE_A_WAIT_BCON:
- musb->xceiv.state = OTG_STATE_A_WAIT_VFALL;
+ musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
break;
case OTG_STATE_A_WAIT_VFALL:
- musb->xceiv.state = OTG_STATE_A_IDLE;
+ musb->xceiv->state = OTG_STATE_A_IDLE;
break;
default:
- musb->xceiv.state = OTG_STATE_A_IDLE;
+ musb->xceiv->state = OTG_STATE_A_IDLE;
}
musb->is_active = 0;
- musb->xceiv.default_a = 1;
+ musb->xceiv->default_a = 1;
MUSB_HST_MODE(musb);
} else {
musb->is_active = 0;
- musb->xceiv.default_a = 0;
- musb->xceiv.state = OTG_STATE_B_IDLE;
+ musb->xceiv->default_a = 0;
+ musb->xceiv->state = OTG_STATE_B_IDLE;
MUSB_DEV_MODE(musb);
}
@@ -674,7 +676,7 @@
else
default_a = is_host_enabled(musb);
DBG(2, "Default-%c\n", default_a ? 'A' : 'B');
- musb->xceiv.default_a = default_a;
+ musb->xceiv->default_a = default_a;
tusb_source_power(musb, default_a);
/* Don't allow idling immediately */
@@ -686,7 +688,7 @@
if (int_src & TUSB_INT_SRC_VBUS_SENSE_CHNG) {
/* B-dev state machine: no vbus ~= disconnect */
- if ((is_otg_enabled(musb) && !musb->xceiv.default_a)
+ if ((is_otg_enabled(musb) && !musb->xceiv->default_a)
|| !is_host_enabled(musb)) {
#ifdef CONFIG_USB_MUSB_HDRC_HCD
/* ? musb_root_disconnect(musb); */
@@ -701,9 +703,9 @@
if (otg_stat & TUSB_DEV_OTG_STAT_SESS_END) {
DBG(1, "Forcing disconnect (no interrupt)\n");
- if (musb->xceiv.state != OTG_STATE_B_IDLE) {
+ if (musb->xceiv->state != OTG_STATE_B_IDLE) {
/* INTR_DISCONNECT can hide... */
- musb->xceiv.state = OTG_STATE_B_IDLE;
+ musb->xceiv->state = OTG_STATE_B_IDLE;
musb->int_usb |= MUSB_INTR_DISCONNECT;
}
musb->is_active = 0;
@@ -717,7 +719,7 @@
DBG(2, "vbus change, %s, otg %03x\n",
otg_state_string(musb), otg_stat);
- switch (musb->xceiv.state) {
+ switch (musb->xceiv->state) {
case OTG_STATE_A_IDLE:
DBG(2, "Got SRP, turning on VBUS\n");
musb_set_vbus(musb, 1);
@@ -765,7 +767,7 @@
DBG(4, "%s timer, %03x\n", otg_state_string(musb), otg_stat);
- switch (musb->xceiv.state) {
+ switch (musb->xceiv->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
@@ -777,7 +779,7 @@
DBG(2, "devctl %02x\n", devctl);
break;
}
- musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
+ musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
musb->is_active = 0;
idle_timeout = jiffies
+ msecs_to_jiffies(musb->a_wait_bcon);
@@ -1093,9 +1095,14 @@
{
struct platform_device *pdev;
struct resource *mem;
- void __iomem *sync;
+ void __iomem *sync = NULL;
int ret;
+ usb_nop_xceiv_register();
+ musb->xceiv = otg_get_transceiver();
+ if (!musb->xceiv)
+ return -ENODEV;
+
pdev = to_platform_device(musb->controller);
/* dma address for async dma */
@@ -1106,14 +1113,16 @@
mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!mem) {
pr_debug("no sync dma resource?\n");
- return -ENODEV;
+ ret = -ENODEV;
+ goto done;
}
musb->sync = mem->start;
sync = ioremap(mem->start, mem->end - mem->start + 1);
if (!sync) {
pr_debug("ioremap for sync failed\n");
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto done;
}
musb->sync_va = sync;
@@ -1126,28 +1135,37 @@
if (ret) {
printk(KERN_ERR "Could not start tusb6010 (%d)\n",
ret);
- return -ENODEV;
+ goto done;
}
musb->isr = tusb_interrupt;
if (is_host_enabled(musb))
musb->board_set_vbus = tusb_source_power;
- if (is_peripheral_enabled(musb))
- musb->xceiv.set_power = tusb_draw_power;
+ if (is_peripheral_enabled(musb)) {
+ musb->xceiv->set_power = tusb_draw_power;
+ the_musb = musb;
+ }
setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
+done:
+ if (ret < 0) {
+ if (sync)
+ iounmap(sync);
+ usb_nop_xceiv_unregister();
+ }
return ret;
}
int musb_platform_exit(struct musb *musb)
{
del_timer_sync(&musb_idle_timer);
+ the_musb = NULL;
if (musb->board_set_power)
musb->board_set_power(0);
iounmap(musb->sync_va);
-
+ usb_nop_xceiv_unregister();
return 0;
}