*/
#include <linux/config.h>
-
-#ifdef CONFIG_USB_DEBUG
- #define DEBUG
-#else
- #undef DEBUG
-#endif
-
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/usb.h>
+
#include <asm/io.h>
#include <asm/irq.h>
-#include <linux/usb.h>
+
+#ifdef CONFIG_PPC_PMAC
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/pci-bridge.h>
+#include <asm/prom.h>
+#endif
+
+#include "usb.h"
#include "hcd.h"
-/* PCI-based HCs are normal, but custom bus glue should be ok */
+/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
/*-------------------------------------------------------------------------*/
if (pci_enable_device (dev) < 0)
return -ENODEV;
- dev->current_state = 0;
- dev->dev.power.power_state = 0;
+ dev->current_state = PCI_D0;
+ dev->dev.power.power_state = PMSG_ON;
if (!dev->irq) {
dev_err (&dev->dev,
}
}
-#ifdef CONFIG_PCI_NAMES
- hcd->product_desc = dev->pretty_name;
-#endif
-
pci_set_master (dev);
retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
#ifdef CONFIG_PM
-static char __attribute_used__ *pci_state(u32 state)
-{
- switch (state) {
- case 0: return "D0";
- case 1: return "D1";
- case 2: return "D2";
- case 3: return "D3hot";
- case 4: return "D3cold";
- }
- return NULL;
-}
-
/**
* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
* @dev: USB Host Controller being suspended
- * @state: state that the controller is going into
+ * @message: semantics in flux
*
* Store this function in the HCD's struct pci_driver as suspend().
*/
-int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state)
+int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
{
struct usb_hcd *hcd;
int retval = 0;
hcd = pci_get_drvdata(dev);
+ /* Root hub suspend should have stopped all downstream traffic,
+ * and all bus master traffic. And done so for both the interface
+ * and the stub usb_device (which we check here). But maybe it
+ * didn't; writing sysfs power/state files ignores such rules...
+ *
+ * We must ignore the FREEZE vs SUSPEND distinction here, because
+ * otherwise the swsusp will save (and restore) garbage state.
+ */
+ if (hcd->self.root_hub->dev.power.power_state.event == PM_EVENT_ON)
+ return -EBUSY;
+
+ if (hcd->driver->suspend) {
+ retval = hcd->driver->suspend(hcd, message);
+ suspend_report_result(hcd->driver->suspend, retval);
+ if (retval)
+ goto done;
+ }
+ synchronize_irq(dev->irq);
+
+ /* FIXME until the generic PM interfaces change a lot more, this
+ * can't use PCI D1 and D2 states. For example, the confusion
+ * between messages and states will need to vanish, and messages
+ * will need to provide a target system state again.
+ *
+ * It'll be important to learn characteristics of the target state,
+ * especially on embedded hardware where the HCD will often be in
+ * charge of an external VBUS power supply and one or more clocks.
+ * Some target system states will leave them active; others won't.
+ * (With PCI, that's often handled by platform BIOS code.)
+ */
+
/* even when the PCI layer rejects some of the PCI calls
* below, HCs can try global suspend and reduce DMA traffic.
* PM-sensitive HCDs may already have done this.
*/
has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
- if (state > 4)
- state = 4;
- switch (hcd->state) {
-
- /* entry if root hub wasn't yet suspended ... from sysfs,
- * without autosuspend, or if USB_SUSPEND isn't configured.
+ /* Downstream ports from this root hub should already be quiesced, so
+ * there will be no DMA activity. Now we can shut down the upstream
+ * link (except maybe for PME# resume signaling) and enter some PCI
+ * low power state, if the hardware allows.
*/
- case HC_STATE_RUNNING:
- hcd->state = HC_STATE_QUIESCING;
- retval = hcd->driver->suspend (hcd, state);
- if (retval) {
- dev_dbg (hcd->self.controller,
- "suspend fail, retval %d\n",
- retval);
- break;
- }
- hcd->state = HC_STATE_SUSPENDED;
- /* FALLTHROUGH */
+ if (hcd->state == HC_STATE_SUSPENDED) {
- /* entry with CONFIG_USB_SUSPEND, or hcds that autosuspend: the
- * controller and/or root hub will already have been suspended,
- * but it won't be ready for a PCI resume call.
- *
- * FIXME only CONFIG_USB_SUSPEND guarantees hub_suspend() will
- * have been called, otherwise root hub timers still run ...
- */
- case HC_STATE_SUSPENDED:
- if (state <= dev->current_state)
- break;
-
- /* no DMA or IRQs except in D0 */
- if (!dev->current_state) {
+ /* no DMA or IRQs except when HC is active */
+ if (dev->current_state == PCI_D0) {
pci_save_state (dev);
pci_disable_device (dev);
- free_irq (hcd->irq, hcd);
}
if (!has_pci_pm) {
dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
- break;
+ goto done;
}
- /* POLICY: ignore D1/D2/D3hot differences;
- * we know D3hot will always work.
+ /* NOTE: dev->current_state becomes nonzero only here, and
+ * only for devices that support PCI PM. Also, exiting
+ * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
+ * some device state (e.g. as part of clock reinit).
*/
- retval = pci_set_power_state (dev, state);
- if (retval < 0 && state < 3) {
- retval = pci_set_power_state (dev, 3);
- if (retval == 0)
- state = 3;
- }
+ retval = pci_set_power_state (dev, PCI_D3hot);
+ suspend_report_result(pci_set_power_state, retval);
if (retval == 0) {
- dev_dbg (hcd->self.controller, "--> PCI %s\n",
- pci_state(dev->current_state));
-#ifdef CONFIG_USB_SUSPEND
- pci_enable_wake (dev, state, hcd->remote_wakeup);
- pci_enable_wake (dev, 4, hcd->remote_wakeup);
-#endif
- } else if (retval < 0) {
- dev_dbg (&dev->dev, "PCI %s suspend fail, %d\n",
- pci_state(state), retval);
+ int wake = device_can_wakeup(&hcd->self.root_hub->dev);
+
+ wake = wake && device_may_wakeup(hcd->self.controller);
+
+ dev_dbg (hcd->self.controller, "--> PCI D3%s\n",
+ wake ? "/wakeup" : "");
+
+ /* Ignore these return values. We rely on pci code to
+ * reject requests the hardware can't implement, rather
+ * than coding the same thing.
+ */
+ (void) pci_enable_wake (dev, PCI_D3hot, wake);
+ (void) pci_enable_wake (dev, PCI_D3cold, wake);
+ } else {
+ dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
+ retval);
(void) usb_hcd_pci_resume (dev);
- break;
}
- break;
- default:
+
+ } else {
dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
hcd->state);
+ WARN_ON(1);
retval = -EINVAL;
- break;
}
- /* update power_state **ONLY** to make sysfs happier */
- if (retval == 0)
- dev->dev.power.power_state = state;
+done:
+ if (retval == 0) {
+ dev->dev.power.power_state = PMSG_SUSPEND;
+
+#ifdef CONFIG_PPC_PMAC
+ /* Disable ASIC clocks for USB */
+ if (machine_is(powermac)) {
+ struct device_node *of_node;
+
+ of_node = pci_device_to_OF_node (dev);
+ if (of_node)
+ pmac_call_feature(PMAC_FTR_USB_ENABLE,
+ of_node, 0, 0);
+ }
+#endif
+ }
+
return retval;
}
EXPORT_SYMBOL (usb_hcd_pci_suspend);
{
struct usb_hcd *hcd;
int retval;
- int has_pci_pm;
hcd = pci_get_drvdata(dev);
if (hcd->state != HC_STATE_SUSPENDED) {
"can't resume, not suspended!\n");
return 0;
}
- has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
- /* D3cold resume isn't usually reported this way... */
- dev_dbg(hcd->self.controller, "resume from PCI %s%s\n",
- pci_state(dev->current_state),
- has_pci_pm ? "" : " (legacy)");
+#ifdef CONFIG_PPC_PMAC
+ /* Reenable ASIC clocks for USB */
+ if (machine_is(powermac)) {
+ struct device_node *of_node;
+
+ of_node = pci_device_to_OF_node (dev);
+ if (of_node)
+ pmac_call_feature (PMAC_FTR_USB_ENABLE,
+ of_node, 0, 1);
+ }
+#endif
- hcd->state = HC_STATE_RESUMING;
+ /* NOTE: chip docs cover clean "real suspend" cases (what Linux
+ * calls "standby", "suspend to RAM", and so on). There are also
+ * dirty cases when swsusp fakes a suspend in "shutdown" mode.
+ */
+ if (dev->current_state != PCI_D0) {
+#ifdef DEBUG
+ int pci_pm;
+ u16 pmcr;
+
+ pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
+ pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
+ pmcr &= PCI_PM_CTRL_STATE_MASK;
+ if (pmcr) {
+ /* Clean case: power to USB and to HC registers was
+ * maintained; remote wakeup is easy.
+ */
+ dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
+ pmcr);
+ } else {
+ /* Clean: HC lost Vcc power, D0 uninitialized
+ * + Vaux may have preserved port and transceiver
+ * state ... for remote wakeup from D3cold
+ * + or not; HCD must reinit + re-enumerate
+ *
+ * Dirty: D0 semi-initialized cases with swsusp
+ * + after BIOS init
+ * + after Linux init (HCD statically linked)
+ */
+ dev_dbg(hcd->self.controller,
+ "PCI D0, from previous PCI D%d\n",
+ dev->current_state);
+ }
+#endif
+ /* yes, ignore these results too... */
+ (void) pci_enable_wake (dev, dev->current_state, 0);
+ (void) pci_enable_wake (dev, PCI_D3cold, 0);
+ } else {
+ /* Same basic cases: clean (powered/not), dirty */
+ dev_dbg(hcd->self.controller, "PCI legacy resume\n");
+ }
- if (has_pci_pm)
- pci_set_power_state (dev, 0);
- dev->dev.power.power_state = 0;
- retval = request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ,
- hcd->driver->description, hcd);
+ /* NOTE: the PCI API itself is asymmetric here. We don't need to
+ * pci_set_power_state(PCI_D0) since that's part of re-enabling;
+ * but that won't re-enable bus mastering. Yet pci_disable_device()
+ * explicitly disables bus mastering...
+ */
+ retval = pci_enable_device (dev);
if (retval < 0) {
dev_err (hcd->self.controller,
- "can't restore IRQ after resume!\n");
+ "can't re-enable after resume, %d!\n", retval);
return retval;
}
- hcd->saw_irq = 0;
+ pci_set_master (dev);
pci_restore_state (dev);
-#ifdef CONFIG_USB_SUSPEND
- pci_enable_wake (dev, dev->current_state, 0);
- pci_enable_wake (dev, 4, 0);
-#endif
- retval = hcd->driver->resume (hcd);
- if (!HC_IS_RUNNING (hcd->state)) {
- dev_dbg (hcd->self.controller,
- "resume fail, retval %d\n", retval);
- usb_hc_died (hcd);
+ dev->dev.power.power_state = PMSG_ON;
+
+ clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
+
+ if (hcd->driver->resume) {
+ retval = hcd->driver->resume(hcd);
+ if (retval) {
+ dev_err (hcd->self.controller,
+ "PCI post-resume error %d!\n", retval);
+ usb_hc_died (hcd);
+ }
}
return retval;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff