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linuxdebug/drivers/usb/host/sl811-hcd.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* SL811HS HCD (Host Controller Driver) for USB.
*
* Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
* Copyright (C) 2004-2005 David Brownell
*
* Periodic scheduling is based on Roman's OHCI code
* Copyright (C) 1999 Roman Weissgaerber
*
* The SL811HS controller handles host side USB (like the SL11H, but with
* another register set and SOF generation) as well as peripheral side USB
* (like the SL811S). This driver version doesn't implement the Gadget API
* for the peripheral role; or OTG (that'd need much external circuitry).
*
* For documentation, see the SL811HS spec and the "SL811HS Embedded Host"
* document (providing significant pieces missing from that spec); plus
* the SL811S spec if you want peripheral side info.
*/
/*
* Status: Passed basic stress testing, works with hubs, mice, keyboards,
* and usb-storage.
*
* TODO:
* - usb suspend/resume triggered by sl811
* - various issues noted in the code
* - performance work; use both register banks; ...
* - use urb->iso_frame_desc[] with ISO transfers
*/
#undef VERBOSE
#undef PACKET_TRACE
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/usb/sl811.h>
#include <linux/usb/hcd.h>
#include <linux/platform_device.h>
#include <linux/prefetch.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include "sl811.h"
MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sl811-hcd");
#define DRIVER_VERSION "19 May 2005"
/* for now, use only one transfer register bank */
#undef USE_B
// #define QUIRK2
#define QUIRK3
static const char hcd_name[] = "sl811-hcd";
/*-------------------------------------------------------------------------*/
static void port_power(struct sl811 *sl811, int is_on)
{
struct usb_hcd *hcd = sl811_to_hcd(sl811);
/* hub is inactive unless the port is powered */
if (is_on) {
if (sl811->port1 & USB_PORT_STAT_POWER)
return;
sl811->port1 = USB_PORT_STAT_POWER;
sl811->irq_enable = SL11H_INTMASK_INSRMV;
} else {
sl811->port1 = 0;
sl811->irq_enable = 0;
hcd->state = HC_STATE_HALT;
}
sl811->ctrl1 = 0;
sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
if (sl811->board && sl811->board->port_power) {
/* switch VBUS, at 500mA unless hub power budget gets set */
dev_dbg(hcd->self.controller, "power %s\n",
is_on ? "on" : "off");
sl811->board->port_power(hcd->self.controller, is_on);
}
/* reset as thoroughly as we can */
if (sl811->board && sl811->board->reset)
sl811->board->reset(hcd->self.controller);
else {
sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
mdelay(20);
}
sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
// if !is_on, put into lowpower mode now
}
/*-------------------------------------------------------------------------*/
/* This is a PIO-only HCD. Queueing appends URBs to the endpoint's queue,
* and may start I/O. Endpoint queues are scanned during completion irq
* handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
*
* Using an external DMA engine to copy a packet at a time could work,
* though setup/teardown costs may be too big to make it worthwhile.
*/
/* SETUP starts a new control request. Devices are not allowed to
* STALL or NAK these; they must cancel any pending control requests.
*/
static void setup_packet(
struct sl811 *sl811,
struct sl811h_ep *ep,
struct urb *urb,
u8 bank,
u8 control
)
{
u8 addr;
u8 len;
void __iomem *data_reg;
addr = SL811HS_PACKET_BUF(bank == 0);
len = sizeof(struct usb_ctrlrequest);
data_reg = sl811->data_reg;
sl811_write_buf(sl811, addr, urb->setup_packet, len);
/* autoincrementing */
sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
writeb(len, data_reg);
writeb(SL_SETUP /* | ep->epnum */, data_reg);
writeb(usb_pipedevice(urb->pipe), data_reg);
/* always OUT/data0 */
sl811_write(sl811, bank + SL11H_HOSTCTLREG,
control | SL11H_HCTLMASK_OUT);
ep->length = 0;
PACKET("SETUP qh%p\n", ep);
}
/* STATUS finishes control requests, often after IN or OUT data packets */
static void status_packet(
struct sl811 *sl811,
struct sl811h_ep *ep,
struct urb *urb,
u8 bank,
u8 control
)
{
int do_out;
void __iomem *data_reg;
do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
data_reg = sl811->data_reg;
/* autoincrementing */
sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
writeb(0, data_reg);
writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
writeb(usb_pipedevice(urb->pipe), data_reg);
/* always data1; sometimes IN */
control |= SL11H_HCTLMASK_TOGGLE;
if (do_out)
control |= SL11H_HCTLMASK_OUT;
sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
ep->length = 0;
PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
do_out ? "out" : "in", ep);
}
/* IN packets can be used with any type of endpoint. here we just
* start the transfer, data from the peripheral may arrive later.
* urb->iso_frame_desc is currently ignored here...
*/
static void in_packet(
struct sl811 *sl811,
struct sl811h_ep *ep,
struct urb *urb,
u8 bank,
u8 control
)
{
u8 addr;
u8 len;
void __iomem *data_reg;
/* avoid losing data on overflow */
len = ep->maxpacket;
addr = SL811HS_PACKET_BUF(bank == 0);
if (!(control & SL11H_HCTLMASK_ISOCH)
&& usb_gettoggle(urb->dev, ep->epnum, 0))
control |= SL11H_HCTLMASK_TOGGLE;
data_reg = sl811->data_reg;
/* autoincrementing */
sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
writeb(len, data_reg);
writeb(SL_IN | ep->epnum, data_reg);
writeb(usb_pipedevice(urb->pipe), data_reg);
sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
ep->length = min_t(u32, len,
urb->transfer_buffer_length - urb->actual_length);
PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
!!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
}
/* OUT packets can be used with any type of endpoint.
* urb->iso_frame_desc is currently ignored here...
*/
static void out_packet(
struct sl811 *sl811,
struct sl811h_ep *ep,
struct urb *urb,
u8 bank,
u8 control
)
{
void *buf;
u8 addr;
u8 len;
void __iomem *data_reg;
buf = urb->transfer_buffer + urb->actual_length;
prefetch(buf);
len = min_t(u32, ep->maxpacket,
urb->transfer_buffer_length - urb->actual_length);
if (!(control & SL11H_HCTLMASK_ISOCH)
&& usb_gettoggle(urb->dev, ep->epnum, 1))
control |= SL11H_HCTLMASK_TOGGLE;
addr = SL811HS_PACKET_BUF(bank == 0);
data_reg = sl811->data_reg;
sl811_write_buf(sl811, addr, buf, len);
/* autoincrementing */
sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
writeb(len, data_reg);
writeb(SL_OUT | ep->epnum, data_reg);
writeb(usb_pipedevice(urb->pipe), data_reg);
sl811_write(sl811, bank + SL11H_HOSTCTLREG,
control | SL11H_HCTLMASK_OUT);
ep->length = len;
PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
!!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
}
/*-------------------------------------------------------------------------*/
/* caller updates on-chip enables later */
static inline void sofirq_on(struct sl811 *sl811)
{
if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
return;
dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq on\n");
sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
}
static inline void sofirq_off(struct sl811 *sl811)
{
if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
return;
dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq off\n");
sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
}
/*-------------------------------------------------------------------------*/
/* pick the next endpoint for a transaction, and issue it.
* frames start with periodic transfers (after whatever is pending
* from the previous frame), and the rest of the time is async
* transfers, scheduled round-robin.
*/
static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
{
struct sl811h_ep *ep;
struct urb *urb;
int fclock;
u8 control;
/* use endpoint at schedule head */
if (sl811->next_periodic) {
ep = sl811->next_periodic;
sl811->next_periodic = ep->next;
} else {
if (sl811->next_async)
ep = sl811->next_async;
else if (!list_empty(&sl811->async))
ep = container_of(sl811->async.next,
struct sl811h_ep, schedule);
else {
/* could set up the first fullspeed periodic
* transfer for the next frame ...
*/
return NULL;
}
#ifdef USE_B
if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
return NULL;
#endif
if (ep->schedule.next == &sl811->async)
sl811->next_async = NULL;
else
sl811->next_async = container_of(ep->schedule.next,
struct sl811h_ep, schedule);
}
if (unlikely(list_empty(&ep->hep->urb_list))) {
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"empty %p queue?\n", ep);
return NULL;
}
urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
control = ep->defctrl;
/* if this frame doesn't have enough time left to transfer this
* packet, wait till the next frame. too-simple algorithm...
*/
fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
fclock -= 100; /* setup takes not much time */
if (urb->dev->speed == USB_SPEED_LOW) {
if (control & SL11H_HCTLMASK_PREAMBLE) {
/* also note erratum 1: some hubs won't work */
fclock -= 800;
}
fclock -= ep->maxpacket << 8;
/* erratum 2: AFTERSOF only works for fullspeed */
if (fclock < 0) {
if (ep->period)
sl811->stat_overrun++;
sofirq_on(sl811);
return NULL;
}
} else {
fclock -= 12000 / 19; /* 19 64byte packets/msec */
if (fclock < 0) {
if (ep->period)
sl811->stat_overrun++;
control |= SL11H_HCTLMASK_AFTERSOF;
/* throttle bulk/control irq noise */
} else if (ep->nak_count)
control |= SL11H_HCTLMASK_AFTERSOF;
}
switch (ep->nextpid) {
case USB_PID_IN:
in_packet(sl811, ep, urb, bank, control);
break;
case USB_PID_OUT:
out_packet(sl811, ep, urb, bank, control);
break;
case USB_PID_SETUP:
setup_packet(sl811, ep, urb, bank, control);
break;
case USB_PID_ACK: /* for control status */
status_packet(sl811, ep, urb, bank, control);
break;
default:
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"bad ep%p pid %02x\n", ep, ep->nextpid);
ep = NULL;
}
return ep;
}
#define MIN_JIFFIES ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
static inline void start_transfer(struct sl811 *sl811)
{
if (sl811->port1 & USB_PORT_STAT_SUSPEND)
return;
if (sl811->active_a == NULL) {
sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
if (sl811->active_a != NULL)
sl811->jiffies_a = jiffies + MIN_JIFFIES;
}
#ifdef USE_B
if (sl811->active_b == NULL) {
sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
if (sl811->active_b != NULL)
sl811->jiffies_b = jiffies + MIN_JIFFIES;
}
#endif
}
static void finish_request(
struct sl811 *sl811,
struct sl811h_ep *ep,
struct urb *urb,
int status
) __releases(sl811->lock) __acquires(sl811->lock)
{
unsigned i;
if (usb_pipecontrol(urb->pipe))
ep->nextpid = USB_PID_SETUP;
usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb);
spin_unlock(&sl811->lock);
usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status);
spin_lock(&sl811->lock);
/* leave active endpoints in the schedule */
if (!list_empty(&ep->hep->urb_list))
return;
/* async deschedule? */
if (!list_empty(&ep->schedule)) {
list_del_init(&ep->schedule);
if (ep == sl811->next_async)
sl811->next_async = NULL;
return;
}
/* periodic deschedule */
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
struct sl811h_ep *temp;
struct sl811h_ep **prev = &sl811->periodic[i];
while (*prev && ((temp = *prev) != ep))
prev = &temp->next;
if (*prev)
*prev = ep->next;
sl811->load[i] -= ep->load;
}
ep->branch = PERIODIC_SIZE;
sl811->periodic_count--;
sl811_to_hcd(sl811)->self.bandwidth_allocated
-= ep->load / ep->period;
if (ep == sl811->next_periodic)
sl811->next_periodic = ep->next;
/* we might turn SOFs back on again for the async schedule */
if (sl811->periodic_count == 0)
sofirq_off(sl811);
}
static void
done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank)
{
u8 status;
struct urb *urb;
int urbstat = -EINPROGRESS;
if (unlikely(!ep))
return;
status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
/* we can safely ignore NAKs */
if (status & SL11H_STATMASK_NAK) {
// PACKET("...NAK_%02x qh%p\n", bank, ep);
if (!ep->period)
ep->nak_count++;
ep->error_count = 0;
/* ACK advances transfer, toggle, and maybe queue */
} else if (status & SL11H_STATMASK_ACK) {
struct usb_device *udev = urb->dev;
int len;
unsigned char *buf;
/* urb->iso_frame_desc is currently ignored here... */
ep->nak_count = ep->error_count = 0;
switch (ep->nextpid) {
case USB_PID_OUT:
// PACKET("...ACK/out_%02x qh%p\n", bank, ep);
urb->actual_length += ep->length;
usb_dotoggle(udev, ep->epnum, 1);
if (urb->actual_length
== urb->transfer_buffer_length) {
if (usb_pipecontrol(urb->pipe))
ep->nextpid = USB_PID_ACK;
/* some bulk protocols terminate OUT transfers
* by a short packet, using ZLPs not padding.
*/
else if (ep->length < ep->maxpacket
|| !(urb->transfer_flags
& URB_ZERO_PACKET))
urbstat = 0;
}
break;
case USB_PID_IN:
// PACKET("...ACK/in_%02x qh%p\n", bank, ep);
buf = urb->transfer_buffer + urb->actual_length;
prefetchw(buf);
len = ep->maxpacket - sl811_read(sl811,
bank + SL11H_XFERCNTREG);
if (len > ep->length) {
len = ep->length;
urbstat = -EOVERFLOW;
}
urb->actual_length += len;
sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
buf, len);
usb_dotoggle(udev, ep->epnum, 0);
if (urbstat == -EINPROGRESS &&
(len < ep->maxpacket ||
urb->actual_length ==
urb->transfer_buffer_length)) {
if (usb_pipecontrol(urb->pipe))
ep->nextpid = USB_PID_ACK;
else
urbstat = 0;
}
break;
case USB_PID_SETUP:
// PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
if (urb->transfer_buffer_length == urb->actual_length)
ep->nextpid = USB_PID_ACK;
else if (usb_pipeout(urb->pipe)) {
usb_settoggle(udev, 0, 1, 1);
ep->nextpid = USB_PID_OUT;
} else {
usb_settoggle(udev, 0, 0, 1);
ep->nextpid = USB_PID_IN;
}
break;
case USB_PID_ACK:
// PACKET("...ACK/status_%02x qh%p\n", bank, ep);
urbstat = 0;
break;
}
/* STALL stops all transfers */
} else if (status & SL11H_STATMASK_STALL) {
PACKET("...STALL_%02x qh%p\n", bank, ep);
ep->nak_count = ep->error_count = 0;
urbstat = -EPIPE;
/* error? retry, until "3 strikes" */
} else if (++ep->error_count >= 3) {
if (status & SL11H_STATMASK_TMOUT)
urbstat = -ETIME;
else if (status & SL11H_STATMASK_OVF)
urbstat = -EOVERFLOW;
else
urbstat = -EPROTO;
ep->error_count = 0;
PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
bank, status, ep, urbstat);
}
if (urbstat != -EINPROGRESS || urb->unlinked)
finish_request(sl811, ep, urb, urbstat);
}
static inline u8 checkdone(struct sl811 *sl811)
{
u8 ctl;
u8 irqstat = 0;
if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
if (ctl & SL11H_HCTLMASK_ARM)
sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"%s DONE_A: ctrl %02x sts %02x\n",
(ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
ctl,
sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
irqstat |= SL11H_INTMASK_DONE_A;
}
#ifdef USE_B
if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
if (ctl & SL11H_HCTLMASK_ARM)
sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"%s DONE_B: ctrl %02x sts %02x\n",
(ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
ctl,
sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
irqstat |= SL11H_INTMASK_DONE_A;
}
#endif
return irqstat;
}
static irqreturn_t sl811h_irq(struct usb_hcd *hcd)
{
struct sl811 *sl811 = hcd_to_sl811(hcd);
u8 irqstat;
irqreturn_t ret = IRQ_NONE;
unsigned retries = 5;
spin_lock(&sl811->lock);
retry:
irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
if (irqstat) {
sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
irqstat &= sl811->irq_enable;
}
#ifdef QUIRK2
/* this may no longer be necessary ... */
if (irqstat == 0) {
irqstat = checkdone(sl811);
if (irqstat)
sl811->stat_lost++;
}
#endif
/* USB packets, not necessarily handled in the order they're
* issued ... that's fine if they're different endpoints.
*/
if (irqstat & SL11H_INTMASK_DONE_A) {
done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF));
sl811->active_a = NULL;
sl811->stat_a++;
}
#ifdef USE_B
if (irqstat & SL11H_INTMASK_DONE_B) {
done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF));
sl811->active_b = NULL;
sl811->stat_b++;
}
#endif
if (irqstat & SL11H_INTMASK_SOFINTR) {
unsigned index;
index = sl811->frame++ % (PERIODIC_SIZE - 1);
sl811->stat_sof++;
/* be graceful about almost-inevitable periodic schedule
* overruns: continue the previous frame's transfers iff
* this one has nothing scheduled.
*/
if (sl811->next_periodic) {
// dev_err(hcd->self.controller, "overrun to slot %d\n", index);
sl811->stat_overrun++;
}
if (sl811->periodic[index])
sl811->next_periodic = sl811->periodic[index];
}
/* hub_wq manages debouncing and wakeup */
if (irqstat & SL11H_INTMASK_INSRMV) {
sl811->stat_insrmv++;
/* most stats are reset for each VBUS session */
sl811->stat_wake = 0;
sl811->stat_sof = 0;
sl811->stat_a = 0;
sl811->stat_b = 0;
sl811->stat_lost = 0;
sl811->ctrl1 = 0;
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
sl811->irq_enable = SL11H_INTMASK_INSRMV;
sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
/* usbcore nukes other pending transactions on disconnect */
if (sl811->active_a) {
sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
finish_request(sl811, sl811->active_a,
container_of(sl811->active_a
->hep->urb_list.next,
struct urb, urb_list),
-ESHUTDOWN);
sl811->active_a = NULL;
}
#ifdef USE_B
if (sl811->active_b) {
sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
finish_request(sl811, sl811->active_b,
container_of(sl811->active_b
->hep->urb_list.next,
struct urb, urb_list),
NULL, -ESHUTDOWN);
sl811->active_b = NULL;
}
#endif
/* port status seems weird until after reset, so
* force the reset and make hub_wq clean up later.
*/
if (irqstat & SL11H_INTMASK_RD)
sl811->port1 &= ~USB_PORT_STAT_CONNECTION;
else
sl811->port1 |= USB_PORT_STAT_CONNECTION;
sl811->port1 |= USB_PORT_STAT_C_CONNECTION << 16;
} else if (irqstat & SL11H_INTMASK_RD) {
if (sl811->port1 & USB_PORT_STAT_SUSPEND) {
dev_dbg(hcd->self.controller, "wakeup\n");
sl811->port1 |= USB_PORT_STAT_C_SUSPEND << 16;
sl811->stat_wake++;
} else
irqstat &= ~SL11H_INTMASK_RD;
}
if (irqstat) {
if (sl811->port1 & USB_PORT_STAT_ENABLE)
start_transfer(sl811);
ret = IRQ_HANDLED;
if (retries--)
goto retry;
}
if (sl811->periodic_count == 0 && list_empty(&sl811->async))
sofirq_off(sl811);
sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
spin_unlock(&sl811->lock);
return ret;
}
/*-------------------------------------------------------------------------*/
/* usb 1.1 says max 90% of a frame is available for periodic transfers.
* this driver doesn't promise that much since it's got to handle an
* IRQ per packet; irq handling latencies also use up that time.
*
* NOTE: the periodic schedule is a sparse tree, with the load for
* each branch minimized. see fig 3.5 in the OHCI spec for example.
*/
#define MAX_PERIODIC_LOAD 500 /* out of 1000 usec */
static int balance(struct sl811 *sl811, u16 period, u16 load)
{
int i, branch = -ENOSPC;
/* search for the least loaded schedule branch of that period
* which has enough bandwidth left unreserved.
*/
for (i = 0; i < period ; i++) {
if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
int j;
for (j = i; j < PERIODIC_SIZE; j += period) {
if ((sl811->load[j] + load)
> MAX_PERIODIC_LOAD)
break;
}
if (j < PERIODIC_SIZE)
continue;
branch = i;
}
}
return branch;
}
/*-------------------------------------------------------------------------*/
static int sl811h_urb_enqueue(
struct usb_hcd *hcd,
struct urb *urb,
gfp_t mem_flags
) {
struct sl811 *sl811 = hcd_to_sl811(hcd);
struct usb_device *udev = urb->dev;
unsigned int pipe = urb->pipe;
int is_out = !usb_pipein(pipe);
int type = usb_pipetype(pipe);
int epnum = usb_pipeendpoint(pipe);
struct sl811h_ep *ep = NULL;
unsigned long flags;
int i;
int retval;
struct usb_host_endpoint *hep = urb->ep;
#ifndef CONFIG_USB_SL811_HCD_ISO
if (type == PIPE_ISOCHRONOUS)
return -ENOSPC;
#endif
/* avoid all allocations within spinlocks */
if (!hep->hcpriv) {
ep = kzalloc(sizeof *ep, mem_flags);
if (ep == NULL)
return -ENOMEM;
}
spin_lock_irqsave(&sl811->lock, flags);
/* don't submit to a dead or disabled port */
if (!(sl811->port1 & USB_PORT_STAT_ENABLE)
|| !HC_IS_RUNNING(hcd->state)) {
retval = -ENODEV;
kfree(ep);
goto fail_not_linked;
}
retval = usb_hcd_link_urb_to_ep(hcd, urb);
if (retval) {
kfree(ep);
goto fail_not_linked;
}
if (hep->hcpriv) {
kfree(ep);
ep = hep->hcpriv;
} else if (!ep) {
retval = -ENOMEM;
goto fail;
} else {
INIT_LIST_HEAD(&ep->schedule);
ep->udev = udev;
ep->epnum = epnum;
ep->maxpacket = usb_maxpacket(udev, urb->pipe);
ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
usb_settoggle(udev, epnum, is_out, 0);
if (type == PIPE_CONTROL)
ep->nextpid = USB_PID_SETUP;
else if (is_out)
ep->nextpid = USB_PID_OUT;
else
ep->nextpid = USB_PID_IN;
if (ep->maxpacket > H_MAXPACKET) {
/* iso packets up to 240 bytes could work... */
dev_dbg(hcd->self.controller,
"dev %d ep%d maxpacket %d\n", udev->devnum,
epnum, ep->maxpacket);
retval = -EINVAL;
kfree(ep);
goto fail;
}
if (udev->speed == USB_SPEED_LOW) {
/* send preamble for external hub? */
if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
}
switch (type) {
case PIPE_ISOCHRONOUS:
case PIPE_INTERRUPT:
if (urb->interval > PERIODIC_SIZE)
urb->interval = PERIODIC_SIZE;
ep->period = urb->interval;
ep->branch = PERIODIC_SIZE;
if (type == PIPE_ISOCHRONOUS)
ep->defctrl |= SL11H_HCTLMASK_ISOCH;
ep->load = usb_calc_bus_time(udev->speed, !is_out,
type == PIPE_ISOCHRONOUS,
usb_maxpacket(udev, pipe))
/ 1000;
break;
}
ep->hep = hep;
hep->hcpriv = ep;
}
/* maybe put endpoint into schedule */
switch (type) {
case PIPE_CONTROL:
case PIPE_BULK:
if (list_empty(&ep->schedule))
list_add_tail(&ep->schedule, &sl811->async);
break;
case PIPE_ISOCHRONOUS:
case PIPE_INTERRUPT:
urb->interval = ep->period;
if (ep->branch < PERIODIC_SIZE) {
/* NOTE: the phase is correct here, but the value
* needs offsetting by the transfer queue depth.
* All current drivers ignore start_frame, so this
* is unlikely to ever matter...
*/
urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
+ ep->branch;
break;
}
retval = balance(sl811, ep->period, ep->load);
if (retval < 0)
goto fail;
ep->branch = retval;
retval = 0;
urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
+ ep->branch;
/* sort each schedule branch by period (slow before fast)
* to share the faster parts of the tree without needing
* dummy/placeholder nodes
*/
dev_dbg(hcd->self.controller, "schedule qh%d/%p branch %d\n",
ep->period, ep, ep->branch);
for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
struct sl811h_ep **prev = &sl811->periodic[i];
struct sl811h_ep *here = *prev;
while (here && ep != here) {
if (ep->period > here->period)
break;
prev = &here->next;
here = *prev;
}
if (ep != here) {
ep->next = here;
*prev = ep;
}
sl811->load[i] += ep->load;
}
sl811->periodic_count++;
hcd->self.bandwidth_allocated += ep->load / ep->period;
sofirq_on(sl811);
}
urb->hcpriv = hep;
start_transfer(sl811);
sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
fail:
if (retval)
usb_hcd_unlink_urb_from_ep(hcd, urb);
fail_not_linked:
spin_unlock_irqrestore(&sl811->lock, flags);
return retval;
}
static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
struct sl811 *sl811 = hcd_to_sl811(hcd);
struct usb_host_endpoint *hep;
unsigned long flags;
struct sl811h_ep *ep;
int retval;
spin_lock_irqsave(&sl811->lock, flags);
retval = usb_hcd_check_unlink_urb(hcd, urb, status);
if (retval)
goto fail;
hep = urb->hcpriv;
ep = hep->hcpriv;
if (ep) {
/* finish right away if this urb can't be active ...
* note that some drivers wrongly expect delays
*/
if (ep->hep->urb_list.next != &urb->urb_list) {
/* not front of queue? never active */
/* for active transfers, we expect an IRQ */
} else if (sl811->active_a == ep) {
if (time_before_eq(sl811->jiffies_a, jiffies)) {
/* happens a lot with lowspeed?? */
dev_dbg(hcd->self.controller,
"giveup on DONE_A: ctrl %02x sts %02x\n",
sl811_read(sl811,
SL811_EP_A(SL11H_HOSTCTLREG)),
sl811_read(sl811,
SL811_EP_A(SL11H_PKTSTATREG)));
sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
0);
sl811->active_a = NULL;
} else
urb = NULL;
#ifdef USE_B
} else if (sl811->active_b == ep) {
if (time_before_eq(sl811->jiffies_a, jiffies)) {
/* happens a lot with lowspeed?? */
dev_dbg(hcd->self.controller,
"giveup on DONE_B: ctrl %02x sts %02x\n",
sl811_read(sl811,
SL811_EP_B(SL11H_HOSTCTLREG)),
sl811_read(sl811,
SL811_EP_B(SL11H_PKTSTATREG)));
sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
0);
sl811->active_b = NULL;
} else
urb = NULL;
#endif
} else {
/* front of queue for inactive endpoint */
}
if (urb)
finish_request(sl811, ep, urb, 0);
else
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"dequeue, urb %p active %s; wait4irq\n", urb,
(sl811->active_a == ep) ? "A" : "B");
} else
retval = -EINVAL;
fail:
spin_unlock_irqrestore(&sl811->lock, flags);
return retval;
}
static void
sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
{
struct sl811h_ep *ep = hep->hcpriv;
if (!ep)
return;
/* assume we'd just wait for the irq */
if (!list_empty(&hep->urb_list))
msleep(3);
if (!list_empty(&hep->urb_list))
dev_warn(hcd->self.controller, "ep %p not empty?\n", ep);
kfree(ep);
hep->hcpriv = NULL;
}
static int
sl811h_get_frame(struct usb_hcd *hcd)
{
struct sl811 *sl811 = hcd_to_sl811(hcd);
/* wrong except while periodic transfers are scheduled;
* never matches the on-the-wire frame;
* subject to overruns.
*/
return sl811->frame;
}
/*-------------------------------------------------------------------------*/
/* the virtual root hub timer IRQ checks for hub status */
static int
sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct sl811 *sl811 = hcd_to_sl811(hcd);
#ifdef QUIRK3
unsigned long flags;
/* non-SMP HACK: use root hub timer as i/o watchdog
* this seems essential when SOF IRQs aren't in use...
*/
local_irq_save(flags);
if (!timer_pending(&sl811->timer)) {
if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE)
sl811->stat_lost++;
}
local_irq_restore(flags);
#endif
if (!(sl811->port1 & (0xffff << 16)))
return 0;
/* tell hub_wq port 1 changed */
*buf = (1 << 1);
return 1;
}
static void
sl811h_hub_descriptor (
struct sl811 *sl811,
struct usb_hub_descriptor *desc
) {
u16 temp = 0;
desc->bDescriptorType = USB_DT_HUB;
desc->bHubContrCurrent = 0;
desc->bNbrPorts = 1;
desc->bDescLength = 9;
/* per-port power switching (gang of one!), or none */
desc->bPwrOn2PwrGood = 0;
if (sl811->board && sl811->board->port_power) {
desc->bPwrOn2PwrGood = sl811->board->potpg;
if (!desc->bPwrOn2PwrGood)
desc->bPwrOn2PwrGood = 10;
temp = HUB_CHAR_INDV_PORT_LPSM;
} else
temp = HUB_CHAR_NO_LPSM;
/* no overcurrent errors detection/handling */
temp |= HUB_CHAR_NO_OCPM;
desc->wHubCharacteristics = cpu_to_le16(temp);
/* ports removable, and legacy PortPwrCtrlMask */
desc->u.hs.DeviceRemovable[0] = 0 << 1;
desc->u.hs.DeviceRemovable[1] = ~0;
}
static void
sl811h_timer(struct timer_list *t)
{
struct sl811 *sl811 = from_timer(sl811, t, timer);
unsigned long flags;
u8 irqstat;
u8 signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
const u32 mask = USB_PORT_STAT_CONNECTION
| USB_PORT_STAT_ENABLE
| USB_PORT_STAT_LOW_SPEED;
spin_lock_irqsave(&sl811->lock, flags);
/* stop special signaling */
sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
udelay(3);
irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
switch (signaling) {
case SL11H_CTL1MASK_SE0:
dev_dbg(sl811_to_hcd(sl811)->self.controller, "end reset\n");
sl811->port1 = (USB_PORT_STAT_C_RESET << 16)
| USB_PORT_STAT_POWER;
sl811->ctrl1 = 0;
/* don't wrongly ack RD */
if (irqstat & SL11H_INTMASK_INSRMV)
irqstat &= ~SL11H_INTMASK_RD;
break;
case SL11H_CTL1MASK_K:
dev_dbg(sl811_to_hcd(sl811)->self.controller, "end resume\n");
sl811->port1 &= ~USB_PORT_STAT_SUSPEND;
break;
default:
dev_dbg(sl811_to_hcd(sl811)->self.controller,
"odd timer signaling: %02x\n", signaling);
break;
}
sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
if (irqstat & SL11H_INTMASK_RD) {
/* usbcore nukes all pending transactions on disconnect */
if (sl811->port1 & USB_PORT_STAT_CONNECTION)
sl811->port1 |= (USB_PORT_STAT_C_CONNECTION << 16)
| (USB_PORT_STAT_C_ENABLE << 16);
sl811->port1 &= ~mask;
sl811->irq_enable = SL11H_INTMASK_INSRMV;
} else {
sl811->port1 |= mask;
if (irqstat & SL11H_INTMASK_DP)
sl811->port1 &= ~USB_PORT_STAT_LOW_SPEED;
sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
}
if (sl811->port1 & USB_PORT_STAT_CONNECTION) {
u8 ctrl2 = SL811HS_CTL2_INIT;
sl811->irq_enable |= SL11H_INTMASK_DONE_A;
#ifdef USE_B
sl811->irq_enable |= SL11H_INTMASK_DONE_B;
#endif
if (sl811->port1 & USB_PORT_STAT_LOW_SPEED) {
sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
ctrl2 |= SL811HS_CTL2MASK_DSWAP;
}
/* start SOFs flowing, kickstarting with A registers */
sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
/* autoincrementing */
sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
writeb(SL_SOF, sl811->data_reg);
writeb(0, sl811->data_reg);
sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
SL11H_HCTLMASK_ARM);
/* hub_wq provides debounce delay */
} else {
sl811->ctrl1 = 0;
}
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
/* reenable irqs */
sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
spin_unlock_irqrestore(&sl811->lock, flags);
}
static int
sl811h_hub_control(
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength
) {
struct sl811 *sl811 = hcd_to_sl811(hcd);
int retval = 0;
unsigned long flags;
spin_lock_irqsave(&sl811->lock, flags);
switch (typeReq) {
case ClearHubFeature:
case SetHubFeature:
switch (wValue) {
case C_HUB_OVER_CURRENT:
case C_HUB_LOCAL_POWER:
break;
default:
goto error;
}
break;
case ClearPortFeature:
if (wIndex != 1 || wLength != 0)
goto error;
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
sl811->port1 &= USB_PORT_STAT_POWER;
sl811->ctrl1 = 0;
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
sl811->irq_enable = SL11H_INTMASK_INSRMV;
sl811_write(sl811, SL11H_IRQ_ENABLE,
sl811->irq_enable);
break;
case USB_PORT_FEAT_SUSPEND:
if (!(sl811->port1 & USB_PORT_STAT_SUSPEND))
break;
/* 20 msec of resume/K signaling, other irqs blocked */
dev_dbg(hcd->self.controller, "start resume...\n");
sl811->irq_enable = 0;
sl811_write(sl811, SL11H_IRQ_ENABLE,
sl811->irq_enable);
sl811->ctrl1 |= SL11H_CTL1MASK_K;
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
mod_timer(&sl811->timer, jiffies
+ msecs_to_jiffies(USB_RESUME_TIMEOUT));
break;
case USB_PORT_FEAT_POWER:
port_power(sl811, 0);
break;
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_SUSPEND:
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_OVER_CURRENT:
case USB_PORT_FEAT_C_RESET:
break;
default:
goto error;
}
sl811->port1 &= ~(1 << wValue);
break;
case GetHubDescriptor:
sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
break;
case GetHubStatus:
put_unaligned_le32(0, buf);
break;
case GetPortStatus:
if (wIndex != 1)
goto error;
put_unaligned_le32(sl811->port1, buf);
if (__is_defined(VERBOSE) ||
*(u16*)(buf+2)) /* only if wPortChange is interesting */
dev_dbg(hcd->self.controller, "GetPortStatus %08x\n",
sl811->port1);
break;
case SetPortFeature:
if (wIndex != 1 || wLength != 0)
goto error;
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
if (sl811->port1 & USB_PORT_STAT_RESET)
goto error;
if (!(sl811->port1 & USB_PORT_STAT_ENABLE))
goto error;
dev_dbg(hcd->self.controller,"suspend...\n");
sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
break;
case USB_PORT_FEAT_POWER:
port_power(sl811, 1);
break;
case USB_PORT_FEAT_RESET:
if (sl811->port1 & USB_PORT_STAT_SUSPEND)
goto error;
if (!(sl811->port1 & USB_PORT_STAT_POWER))
break;
/* 50 msec of reset/SE0 signaling, irqs blocked */
sl811->irq_enable = 0;
sl811_write(sl811, SL11H_IRQ_ENABLE,
sl811->irq_enable);
sl811->ctrl1 = SL11H_CTL1MASK_SE0;
sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
sl811->port1 |= USB_PORT_STAT_RESET;
mod_timer(&sl811->timer, jiffies
+ msecs_to_jiffies(50));
break;
default:
goto error;
}
sl811->port1 |= 1 << wValue;
break;
default:
error:
/* "protocol stall" on error */
retval = -EPIPE;
}
spin_unlock_irqrestore(&sl811->lock, flags);
return retval;
}
#ifdef CONFIG_PM
static int
sl811h_bus_suspend(struct usb_hcd *hcd)
{
// SOFs off
dev_dbg(hcd->self.controller, "%s\n", __func__);
return 0;
}
static int
sl811h_bus_resume(struct usb_hcd *hcd)
{
// SOFs on
dev_dbg(hcd->self.controller, "%s\n", __func__);
return 0;
}
#else
#define sl811h_bus_suspend NULL
#define sl811h_bus_resume NULL
#endif
/*-------------------------------------------------------------------------*/
static void dump_irq(struct seq_file *s, char *label, u8 mask)
{
seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
(mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
(mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
(mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
(mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
(mask & SL11H_INTMASK_RD) ? " rd" : "",
(mask & SL11H_INTMASK_DP) ? " dp" : "");
}
static int sl811h_debug_show(struct seq_file *s, void *unused)
{
struct sl811 *sl811 = s->private;
struct sl811h_ep *ep;
unsigned i;
seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
sl811_to_hcd(sl811)->product_desc,
hcd_name, DRIVER_VERSION,
sl811->port1);
seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
seq_printf(s, "current session: done_a %ld done_b %ld "
"wake %ld sof %ld overrun %ld lost %ld\n\n",
sl811->stat_a, sl811->stat_b,
sl811->stat_wake, sl811->stat_sof,
sl811->stat_overrun, sl811->stat_lost);
spin_lock_irq(&sl811->lock);
if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
seq_printf(s, "(suspended)\n\n");
else {
u8 t = sl811_read(sl811, SL11H_CTLREG1);
seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
(t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
case SL11H_CTL1MASK_NORMAL: s = ""; break;
case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
case SL11H_CTL1MASK_K: s = " k/resume"; break;
default: s = "j"; break;
} s; }),
(t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
(t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
dump_irq(s, "irq_enable",
sl811_read(sl811, SL11H_IRQ_ENABLE));
dump_irq(s, "irq_status",
sl811_read(sl811, SL11H_IRQ_STATUS));
seq_printf(s, "frame clocks remaining: %d\n",
sl811_read(sl811, SL11H_SOFTMRREG) << 6);
}
seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
seq_printf(s, "\n");
list_for_each_entry (ep, &sl811->async, schedule) {
struct urb *urb;
seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
" nak %d err %d\n",
(ep == sl811->active_a) ? "(A) " : "",
(ep == sl811->active_b) ? "(B) " : "",
ep, ep->epnum,
({ char *s; switch (ep->nextpid) {
case USB_PID_IN: s = "in"; break;
case USB_PID_OUT: s = "out"; break;
case USB_PID_SETUP: s = "setup"; break;
case USB_PID_ACK: s = "status"; break;
default: s = "?"; break;
} s;}),
ep->maxpacket,
ep->nak_count, ep->error_count);
list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
seq_printf(s, " urb%p, %d/%d\n", urb,
urb->actual_length,
urb->transfer_buffer_length);
}
}
if (!list_empty(&sl811->async))
seq_printf(s, "\n");
seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
for (i = 0; i < PERIODIC_SIZE; i++) {
ep = sl811->periodic[i];
if (!ep)
continue;
seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
/* DUMB: prints shared entries multiple times */
do {
seq_printf(s,
" %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
"err %d\n",
(ep == sl811->active_a) ? "(A) " : "",
(ep == sl811->active_b) ? "(B) " : "",
ep->period, ep,
(ep->udev->speed == USB_SPEED_FULL)
? "" : "ls ",
ep->udev->devnum, ep->epnum,
(ep->epnum == 0) ? ""
: ((ep->nextpid == USB_PID_IN)
? "in"
: "out"),
ep->maxpacket, ep->error_count);
ep = ep->next;
} while (ep);
}
spin_unlock_irq(&sl811->lock);
seq_printf(s, "\n");
return 0;
}
DEFINE_SHOW_ATTRIBUTE(sl811h_debug);
/* expect just one sl811 per system */
static void create_debug_file(struct sl811 *sl811)
{
debugfs_create_file("sl811h", S_IRUGO, usb_debug_root, sl811,
&sl811h_debug_fops);
}
static void remove_debug_file(struct sl811 *sl811)
{
debugfs_lookup_and_remove("sl811h", usb_debug_root);
}
/*-------------------------------------------------------------------------*/
static void
sl811h_stop(struct usb_hcd *hcd)
{
struct sl811 *sl811 = hcd_to_sl811(hcd);
unsigned long flags;
del_timer_sync(&hcd->rh_timer);
spin_lock_irqsave(&sl811->lock, flags);
port_power(sl811, 0);
spin_unlock_irqrestore(&sl811->lock, flags);
}
static int
sl811h_start(struct usb_hcd *hcd)
{
struct sl811 *sl811 = hcd_to_sl811(hcd);
/* chip has been reset, VBUS power is off */
hcd->state = HC_STATE_RUNNING;
if (sl811->board) {
if (!device_can_wakeup(hcd->self.controller))
device_init_wakeup(hcd->self.controller,
sl811->board->can_wakeup);
hcd->power_budget = sl811->board->power * 2;
}
/* enable power and interrupts */
port_power(sl811, 1);
return 0;
}
/*-------------------------------------------------------------------------*/
static const struct hc_driver sl811h_hc_driver = {
.description = hcd_name,
.hcd_priv_size = sizeof(struct sl811),
/*
* generic hardware linkage
*/
.irq = sl811h_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/* Basic lifecycle operations */
.start = sl811h_start,
.stop = sl811h_stop,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = sl811h_urb_enqueue,
.urb_dequeue = sl811h_urb_dequeue,
.endpoint_disable = sl811h_endpoint_disable,
/*
* periodic schedule support
*/
.get_frame_number = sl811h_get_frame,
/*
* root hub support
*/
.hub_status_data = sl811h_hub_status_data,
.hub_control = sl811h_hub_control,
.bus_suspend = sl811h_bus_suspend,
.bus_resume = sl811h_bus_resume,
};
/*-------------------------------------------------------------------------*/
static int
sl811h_remove(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct sl811 *sl811 = hcd_to_sl811(hcd);
struct resource *res;
remove_debug_file(sl811);
usb_remove_hcd(hcd);
/* some platforms may use IORESOURCE_IO */
res = platform_get_resource(dev, IORESOURCE_MEM, 1);
if (res)
iounmap(sl811->data_reg);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (res)
iounmap(sl811->addr_reg);
usb_put_hcd(hcd);
return 0;
}
static int
sl811h_probe(struct platform_device *dev)
{
struct usb_hcd *hcd;
struct sl811 *sl811;
struct resource *addr, *data, *ires;
int irq;
void __iomem *addr_reg;
void __iomem *data_reg;
int retval;
u8 tmp, ioaddr;
unsigned long irqflags;
if (usb_disabled())
return -ENODEV;
/* the chip may be wired for either kind of addressing */
addr = platform_get_mem_or_io(dev, 0);
data = platform_get_mem_or_io(dev, 1);
if (!addr || !data || resource_type(addr) != resource_type(data))
return -ENODEV;
/* basic sanity checks first. board-specific init logic should
* have initialized these three resources and probably board
* specific platform_data. we don't probe for IRQs, and do only
* minimal sanity checking.
*/
ires = platform_get_resource(dev, IORESOURCE_IRQ, 0);
if (dev->num_resources < 3 || !ires)
return -ENODEV;
irq = ires->start;
irqflags = ires->flags & IRQF_TRIGGER_MASK;
ioaddr = resource_type(addr) == IORESOURCE_IO;
if (ioaddr) {
/*
* NOTE: 64-bit resource->start is getting truncated
* to avoid compiler warning, assuming that ->start
* is always 32-bit for this case
*/
addr_reg = (void __iomem *) (unsigned long) addr->start;
data_reg = (void __iomem *) (unsigned long) data->start;
} else {
addr_reg = ioremap(addr->start, 1);
if (addr_reg == NULL) {
retval = -ENOMEM;
goto err2;
}
data_reg = ioremap(data->start, 1);
if (data_reg == NULL) {
retval = -ENOMEM;
goto err4;
}
}
/* allocate and initialize hcd */
hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev_name(&dev->dev));
if (!hcd) {
retval = -ENOMEM;
goto err5;
}
hcd->rsrc_start = addr->start;
sl811 = hcd_to_sl811(hcd);
spin_lock_init(&sl811->lock);
INIT_LIST_HEAD(&sl811->async);
sl811->board = dev_get_platdata(&dev->dev);
timer_setup(&sl811->timer, sl811h_timer, 0);
sl811->addr_reg = addr_reg;
sl811->data_reg = data_reg;
spin_lock_irq(&sl811->lock);
port_power(sl811, 0);
spin_unlock_irq(&sl811->lock);
msleep(200);
tmp = sl811_read(sl811, SL11H_HWREVREG);
switch (tmp >> 4) {
case 1:
hcd->product_desc = "SL811HS v1.2";
break;
case 2:
hcd->product_desc = "SL811HS v1.5";
break;
default:
/* reject case 0, SL11S is less functional */
dev_dbg(&dev->dev, "chiprev %02x\n", tmp);
retval = -ENXIO;
goto err6;
}
/* The chip's IRQ is level triggered, active high. A requirement
* for platform device setup is to cope with things like signal
* inverters (e.g. CF is active low) or working only with edge
* triggers (e.g. most ARM CPUs). Initial driver stress testing
* was on a system with single edge triggering, so most sorts of
* triggering arrangement should work.
*
* Use resource IRQ flags if set by platform device setup.
*/
irqflags |= IRQF_SHARED;
retval = usb_add_hcd(hcd, irq, irqflags);
if (retval != 0)
goto err6;
device_wakeup_enable(hcd->self.controller);
create_debug_file(sl811);
return retval;
err6:
usb_put_hcd(hcd);
err5:
if (!ioaddr)
iounmap(data_reg);
err4:
if (!ioaddr)
iounmap(addr_reg);
err2:
dev_dbg(&dev->dev, "init error, %d\n", retval);
return retval;
}
#ifdef CONFIG_PM
/* for this device there's no useful distinction between the controller
* and its root hub.
*/
static int
sl811h_suspend(struct platform_device *dev, pm_message_t state)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct sl811 *sl811 = hcd_to_sl811(hcd);
int retval = 0;
switch (state.event) {
case PM_EVENT_FREEZE:
retval = sl811h_bus_suspend(hcd);
break;
case PM_EVENT_SUSPEND:
case PM_EVENT_HIBERNATE:
case PM_EVENT_PRETHAW: /* explicitly discard hw state */
port_power(sl811, 0);
break;
}
return retval;
}
static int
sl811h_resume(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct sl811 *sl811 = hcd_to_sl811(hcd);
/* with no "check to see if VBUS is still powered" board hook,
* let's assume it'd only be powered to enable remote wakeup.
*/
if (!sl811->port1 || !device_can_wakeup(&hcd->self.root_hub->dev)) {
sl811->port1 = 0;
port_power(sl811, 1);
usb_root_hub_lost_power(hcd->self.root_hub);
return 0;
}
return sl811h_bus_resume(hcd);
}
#else
#define sl811h_suspend NULL
#define sl811h_resume NULL
#endif
/* this driver is exported so sl811_cs can depend on it */
struct platform_driver sl811h_driver = {
.probe = sl811h_probe,
.remove = sl811h_remove,
.suspend = sl811h_suspend,
.resume = sl811h_resume,
.driver = {
.name = hcd_name,
},
};
EXPORT_SYMBOL(sl811h_driver);
module_platform_driver(sl811h_driver);