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[PATCH] USB: EHCI updates split init/reinit logic for resume

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Moving the PCI-specific parts of the EHCI driver into their own file
created a few issues ... notably on resume paths which (like swsusp)
require re-initializing the controller.  This patch:

 - Splits the EHCI startup code into run-once HCD setup code and
   separate "init the hardware" reinit code.  (That reinit code is
   a superset of the "early usb handoff" code.)

 - Then it makes the PCI init code run both, and the resume code only
   run the reinit code.

 - It also removes needless pci wrappers around EHCI start/stop methods.

 - Removes a byteswap issue that would be seen on big-endian hardware.

The HCD glue still doesn't actually provide a good way to do all this
run-one init stuff in one place though.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Brownell 2005-11-23 15:45:37 -08:00 committed by Linus Torvalds
parent abcc944806
commit 188075211c
2 changed files with 161 additions and 160 deletions
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155
drivers/usb/host/ehci-hcd.c
View File

@ -411,50 +411,39 @@ static void ehci_stop (struct usb_hcd *hcd)
dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status));
}
static int ehci_run (struct usb_hcd *hcd)
/* one-time init, only for memory state */
static int ehci_init(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
u32 temp;
int retval;
u32 hcc_params;
int first;
/* skip some things on restart paths */
first = (ehci->watchdog.data == 0);
if (first) {
init_timer (&ehci->watchdog);
ehci->watchdog.function = ehci_watchdog;
ehci->watchdog.data = (unsigned long) ehci;
}
spin_lock_init(&ehci->lock);
init_timer(&ehci->watchdog);
ehci->watchdog.function = ehci_watchdog;
ehci->watchdog.data = (unsigned long) ehci;
/*
* hw default: 1K periodic list heads, one per frame.
* periodic_size can shrink by USBCMD update if hcc_params allows.
*/
ehci->periodic_size = DEFAULT_I_TDPS;
if (first && (retval = ehci_mem_init (ehci, GFP_KERNEL)) < 0)
if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
return retval;
/* controllers may cache some of the periodic schedule ... */
hcc_params = readl (&ehci->caps->hcc_params);
if (HCC_ISOC_CACHE (hcc_params)) // full frame cache
hcc_params = readl(&ehci->caps->hcc_params);
if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
ehci->i_thresh = 8;
else // N microframes cached
ehci->i_thresh = 2 + HCC_ISOC_THRES (hcc_params);
ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
ehci->reclaim = NULL;
ehci->reclaim_ready = 0;
ehci->next_uframe = -1;
/* controller state: unknown --> reset */
/* EHCI spec section 4.1 */
if ((retval = ehci_reset (ehci)) != 0) {
ehci_mem_cleanup (ehci);
return retval;
}
writel (ehci->periodic_dma, &ehci->regs->frame_list);
/*
* dedicate a qh for the async ring head, since we couldn't unlink
* a 'real' qh without stopping the async schedule [4.8]. use it
@ -462,37 +451,13 @@ static int ehci_run (struct usb_hcd *hcd)
* its dummy is used in hw_alt_next of many tds, to prevent the qh
* from automatically advancing to the next td after short reads.
*/
if (first) {
ehci->async->qh_next.qh = NULL;
ehci->async->hw_next = QH_NEXT (ehci->async->qh_dma);
ehci->async->hw_info1 = cpu_to_le32 (QH_HEAD);
ehci->async->hw_token = cpu_to_le32 (QTD_STS_HALT);
ehci->async->hw_qtd_next = EHCI_LIST_END;
ehci->async->qh_state = QH_STATE_LINKED;
ehci->async->hw_alt_next = QTD_NEXT (ehci->async->dummy->qtd_dma);
}
writel ((u32)ehci->async->qh_dma, &ehci->regs->async_next);
/*
* hcc_params controls whether ehci->regs->segment must (!!!)
* be used; it constrains QH/ITD/SITD and QTD locations.
* pci_pool consistent memory always uses segment zero.
* streaming mappings for I/O buffers, like pci_map_single(),
* can return segments above 4GB, if the device allows.
*
* NOTE: the dma mask is visible through dma_supported(), so
* drivers can pass this info along ... like NETIF_F_HIGHDMA,
* Scsi_Host.highmem_io, and so forth. It's readonly to all
* host side drivers though.
*/
if (HCC_64BIT_ADDR (hcc_params)) {
writel (0, &ehci->regs->segment);
#if 0
// this is deeply broken on almost all architectures
if (!dma_set_mask (hcd->self.controller, DMA_64BIT_MASK))
ehci_info (ehci, "enabled 64bit DMA\n");
#endif
}
ehci->async->qh_next.qh = NULL;
ehci->async->hw_next = QH_NEXT(ehci->async->qh_dma);
ehci->async->hw_info1 = cpu_to_le32(QH_HEAD);
ehci->async->hw_token = cpu_to_le32(QTD_STS_HALT);
ehci->async->hw_qtd_next = EHCI_LIST_END;
ehci->async->qh_state = QH_STATE_LINKED;
ehci->async->hw_alt_next = QTD_NEXT(ehci->async->dummy->qtd_dma);
/* clear interrupt enables, set irq latency */
if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
@ -507,13 +472,13 @@ static int ehci_run (struct usb_hcd *hcd)
* make problems: throughput reduction (!), data errors...
*/
if (park) {
park = min (park, (unsigned) 3);
park = min(park, (unsigned) 3);
temp |= CMD_PARK;
temp |= park << 8;
}
ehci_info (ehci, "park %d\n", park);
ehci_dbg(ehci, "park %d\n", park);
}
if (HCC_PGM_FRAMELISTLEN (hcc_params)) {
if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
/* periodic schedule size can be smaller than default */
temp &= ~(3 << 2);
temp |= (EHCI_TUNE_FLS << 2);
@ -521,16 +486,63 @@ static int ehci_run (struct usb_hcd *hcd)
case 0: ehci->periodic_size = 1024; break;
case 1: ehci->periodic_size = 512; break;
case 2: ehci->periodic_size = 256; break;
default: BUG ();
default: BUG();
}
}
ehci->command = temp;
ehci->reboot_notifier.notifier_call = ehci_reboot;
register_reboot_notifier(&ehci->reboot_notifier);
return 0;
}
/* start HC running; it's halted, ehci_init() has been run (once) */
static int ehci_run (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
int retval;
u32 temp;
u32 hcc_params;
/* EHCI spec section 4.1 */
if ((retval = ehci_reset(ehci)) != 0) {
unregister_reboot_notifier(&ehci->reboot_notifier);
ehci_mem_cleanup(ehci);
return retval;
}
writel(ehci->periodic_dma, &ehci->regs->frame_list);
writel((u32)ehci->async->qh_dma, &ehci->regs->async_next);
/*
* hcc_params controls whether ehci->regs->segment must (!!!)
* be used; it constrains QH/ITD/SITD and QTD locations.
* pci_pool consistent memory always uses segment zero.
* streaming mappings for I/O buffers, like pci_map_single(),
* can return segments above 4GB, if the device allows.
*
* NOTE: the dma mask is visible through dma_supported(), so
* drivers can pass this info along ... like NETIF_F_HIGHDMA,
* Scsi_Host.highmem_io, and so forth. It's readonly to all
* host side drivers though.
*/
hcc_params = readl(&ehci->caps->hcc_params);
if (HCC_64BIT_ADDR(hcc_params)) {
writel(0, &ehci->regs->segment);
#if 0
// this is deeply broken on almost all architectures
if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
ehci_info(ehci, "enabled 64bit DMA\n");
#endif
}
// Philips, Intel, and maybe others need CMD_RUN before the
// root hub will detect new devices (why?); NEC doesn't
temp |= CMD_RUN;
writel (temp, &ehci->regs->command);
dbg_cmd (ehci, "init", temp);
/* set async sleep time = 10 us ... ? */
ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
ehci->command |= CMD_RUN;
writel (ehci->command, &ehci->regs->command);
dbg_cmd (ehci, "init", ehci->command);
/*
* Start, enabling full USB 2.0 functionality ... usb 1.1 devices
@ -538,26 +550,23 @@ static int ehci_run (struct usb_hcd *hcd)
* involved with the root hub. (Except where one is integrated,
* and there's no companion controller unless maybe for USB OTG.)
*/
if (first) {
ehci->reboot_notifier.notifier_call = ehci_reboot;
register_reboot_notifier (&ehci->reboot_notifier);
}
hcd->state = HC_STATE_RUNNING;
writel (FLAG_CF, &ehci->regs->configured_flag);
readl (&ehci->regs->command); /* unblock posted write */
readl (&ehci->regs->command); /* unblock posted writes */
temp = HC_VERSION(readl (&ehci->caps->hc_capbase));
ehci_info (ehci,
"USB %x.%x %s, EHCI %x.%02x, driver %s\n",
"USB %x.%x started, EHCI %x.%02x, driver %s\n",
((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
first ? "initialized" : "restarted",
temp >> 8, temp & 0xff, DRIVER_VERSION);
writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */
if (first)
create_debug_files (ehci);
/* GRR this is run-once init(), being done every time the HC starts.
* So long as they're part of class devices, we can't do it init()
* since the class device isn't created that early.
*/
create_debug_files(ehci);
return 0;
}

166
drivers/usb/host/ehci-pci.c
View File

@ -58,15 +58,76 @@ static int bios_handoff(struct ehci_hcd *ehci, int where, u32 cap)
return 0;
}
/* called by khubd or root hub init threads */
/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
{
u32 temp;
int retval;
unsigned count = 256/4;
/* optional debug port, normally in the first BAR */
temp = pci_find_capability(pdev, 0x0a);
if (temp) {
pci_read_config_dword(pdev, temp, &temp);
temp >>= 16;
if ((temp & (3 << 13)) == (1 << 13)) {
temp &= 0x1fff;
ehci->debug = ehci_to_hcd(ehci)->regs + temp;
temp = readl(&ehci->debug->control);
ehci_info(ehci, "debug port %d%s\n",
HCS_DEBUG_PORT(ehci->hcs_params),
(temp & DBGP_ENABLED)
? " IN USE"
: "");
if (!(temp & DBGP_ENABLED))
ehci->debug = NULL;
}
}
temp = HCC_EXT_CAPS(readl(&ehci->caps->hcc_params));
/* EHCI 0.96 and later may have "extended capabilities" */
while (temp && count--) {
u32 cap;
pci_read_config_dword(pdev, temp, &cap);
ehci_dbg(ehci, "capability %04x at %02x\n", cap, temp);
switch (cap & 0xff) {
case 1: /* BIOS/SMM/... handoff */
if (bios_handoff(ehci, temp, cap) != 0)
return -EOPNOTSUPP;
break;
case 0: /* illegal reserved capability */
ehci_dbg(ehci, "illegal capability!\n");
cap = 0;
/* FALLTHROUGH */
default: /* unknown */
break;
}
temp = (cap >> 8) & 0xff;
}
if (!count) {
ehci_err(ehci, "bogus capabilities ... PCI problems!\n");
return -EIO;
}
/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
retval = pci_set_mwi(pdev);
if (!retval)
ehci_dbg(ehci, "MWI active\n");
ehci_port_power(ehci, 0);
return 0;
}
/* called by khubd or root hub (re)init threads; leaves HC in halt state */
static int ehci_pci_reset(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
u32 temp;
unsigned count = 256/4;
spin_lock_init (&ehci->lock);
int retval;
ehci->caps = hcd->regs;
ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
@ -76,6 +137,10 @@ static int ehci_pci_reset(struct usb_hcd *hcd)
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = readl(&ehci->caps->hcs_params);
retval = ehci_halt(ehci);
if (retval)
return retval;
/* NOTE: only the parts below this line are PCI-specific */
switch (pdev->vendor) {
@ -111,57 +176,9 @@ static int ehci_pci_reset(struct usb_hcd *hcd)
break;
}
/* optional debug port, normally in the first BAR */
temp = pci_find_capability(pdev, 0x0a);
if (temp) {
pci_read_config_dword(pdev, temp, &temp);
temp >>= 16;
if ((temp & (3 << 13)) == (1 << 13)) {
temp &= 0x1fff;
ehci->debug = hcd->regs + temp;
temp = readl(&ehci->debug->control);
ehci_info(ehci, "debug port %d%s\n",
HCS_DEBUG_PORT(ehci->hcs_params),
(temp & DBGP_ENABLED)
? " IN USE"
: "");
if (!(temp & DBGP_ENABLED))
ehci->debug = NULL;
}
}
temp = HCC_EXT_CAPS(readl(&ehci->caps->hcc_params));
/* EHCI 0.96 and later may have "extended capabilities" */
while (temp && count--) {
u32 cap;
pci_read_config_dword(to_pci_dev(hcd->self.controller),
temp, &cap);
ehci_dbg(ehci, "capability %04x at %02x\n", cap, temp);
switch (cap & 0xff) {
case 1: /* BIOS/SMM/... handoff */
if (bios_handoff(ehci, temp, cap) != 0)
return -EOPNOTSUPP;
break;
case 0: /* illegal reserved capability */
ehci_warn(ehci, "illegal capability!\n");
cap = 0;
/* FALLTHROUGH */
default: /* unknown */
break;
}
temp = (cap >> 8) & 0xff;
}
if (!count) {
ehci_err(ehci, "bogus capabilities ... PCI problems!\n");
return -EIO;
}
if (ehci_is_TDI(ehci))
ehci_reset(ehci);
ehci_port_power(ehci, 0);
/* at least the Genesys GL880S needs fixup here */
temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
temp &= 0x0f;
@ -184,39 +201,15 @@ static int ehci_pci_reset(struct usb_hcd *hcd)
}
}
/* force HC to halt state */
return ehci_halt(ehci);
}
static int ehci_pci_start(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int result = 0;
struct pci_dev *pdev;
u16 port_wake;
pdev = to_pci_dev(hcd->self.controller);
/* Serial Bus Release Number is at PCI 0x60 offset */
pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
/* port wake capability, reported by boot firmware */
pci_read_config_word(pdev, 0x62, &port_wake);
hcd->can_wakeup = (port_wake & 1) != 0;
/* REVISIT: per-port wake capability (PCI 0x62) currently unused */
/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
result = pci_set_mwi(pdev);
if (!result)
ehci_dbg(ehci, "MWI active\n");
retval = ehci_pci_reinit(ehci, pdev);
return ehci_run(hcd);
}
/* always called by thread; normally rmmod */
static void ehci_pci_stop(struct usb_hcd *hcd)
{
ehci_stop(hcd);
/* finish init */
return ehci_init(hcd);
}
/*-------------------------------------------------------------------------*/
@ -250,6 +243,7 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
unsigned port;
struct usb_device *root = hcd->self.root_hub;
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
int retval = -EINVAL;
// maybe restore FLADJ
@ -258,7 +252,7 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
msleep(100);
/* If CF is clear, we lost PCI Vaux power and need to restart. */
if (readl(&ehci->regs->configured_flag) != cpu_to_le32(FLAG_CF))
if (readl(&ehci->regs->configured_flag) != FLAG_CF)
goto restart;
/* If any port is suspended (or owned by the companion),
@ -292,7 +286,7 @@ restart:
*/
(void) ehci_halt(ehci);
(void) ehci_reset(ehci);
(void) ehci_pci_reset(hcd);
(void) ehci_pci_reinit(ehci, pdev);
/* emptying the schedule aborts any urbs */
spin_lock_irq(&ehci->lock);
@ -304,9 +298,7 @@ restart:
/* restart; khubd will disconnect devices */
retval = ehci_run(hcd);
/* here we "know" root ports should always stay powered;
* but some controllers may lose all power.
*/
/* here we "know" root ports should always stay powered */
ehci_port_power(ehci, 1);
return retval;
@ -328,12 +320,12 @@ static const struct hc_driver ehci_pci_hc_driver = {
* basic lifecycle operations
*/
.reset = ehci_pci_reset,
.start = ehci_pci_start,
.start = ehci_run,
#ifdef CONFIG_PM
.suspend = ehci_pci_suspend,
.resume = ehci_pci_resume,
#endif
.stop = ehci_pci_stop,
.stop = ehci_stop,
/*
* managing i/o requests and associated device resources