#include <linux/log2.h>
#include <linux/pci-aspm.h>
#include <linux/pm_wakeup.h>
+#include <linux/interrupt.h>
#include <asm/dma.h> /* isa_dma_bridge_buggy */
#include "pci.h"
int pci_find_ext_capability(struct pci_dev *dev, int cap)
{
u32 header;
- int ttl = 480; /* 3840 bytes, minimum 8 bytes per capability */
- int pos = 0x100;
+ int ttl;
+ int pos = PCI_CFG_SPACE_SIZE;
- if (dev->cfg_size <= 256)
+ /* minimum 8 bytes per capability */
+ ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
+
+ if (dev->cfg_size <= PCI_CFG_SPACE_SIZE)
return 0;
if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
return pos;
pos = PCI_EXT_CAP_NEXT(header);
- if (pos < 0x100)
+ if (pos < PCI_CFG_SPACE_SIZE)
break;
if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
return pme_done ? 0 : error;
}
+/**
+ * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
+ * @dev: PCI device to prepare
+ * @enable: True to enable wake-up event generation; false to disable
+ *
+ * Many drivers want the device to wake up the system from D3_hot or D3_cold
+ * and this function allows them to set that up cleanly - pci_enable_wake()
+ * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
+ * ordering constraints.
+ *
+ * This function only returns error code if the device is not capable of
+ * generating PME# from both D3_hot and D3_cold, and the platform is unable to
+ * enable wake-up power for it.
+ */
+int pci_wake_from_d3(struct pci_dev *dev, bool enable)
+{
+ return pci_pme_capable(dev, PCI_D3cold) ?
+ pci_enable_wake(dev, PCI_D3cold, enable) :
+ pci_enable_wake(dev, PCI_D3hot, enable);
+}
+
/**
* pci_target_state - find an appropriate low power state for a given PCI dev
* @dev: PCI device
dev->d1_support = false;
dev->d2_support = false;
if (!pci_no_d1d2(dev)) {
- if (pmc & PCI_PM_CAP_D1) {
- dev_printk(KERN_DEBUG, &dev->dev, "supports D1\n");
+ if (pmc & PCI_PM_CAP_D1)
dev->d1_support = true;
- }
- if (pmc & PCI_PM_CAP_D2) {
- dev_printk(KERN_DEBUG, &dev->dev, "supports D2\n");
+ if (pmc & PCI_PM_CAP_D2)
dev->d2_support = true;
- }
+
+ if (dev->d1_support || dev->d2_support)
+ dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n",
+ dev->d1_support ? " D1" : "",
+ dev->d2_support ? " D2" : "");
}
pmc &= PCI_PM_CAP_PME_MASK;
if (pmc) {
- dev_printk(KERN_INFO, &dev->dev,
- "PME# supported from%s%s%s%s%s\n",
- (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
- (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
- (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
- (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
- (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
+ dev_info(&dev->dev, "PME# supported from%s%s%s%s%s\n",
+ (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
+ (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
+ (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
+ (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
+ (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT;
/*
* Make device's PM flags reflect the wake-up capability, but
}
}
+/**
+ * pci_enable_ari - enable ARI forwarding if hardware support it
+ * @dev: the PCI device
+ */
+void pci_enable_ari(struct pci_dev *dev)
+{
+ int pos;
+ u32 cap;
+ u16 ctrl;
+ struct pci_dev *bridge;
+
+ if (!dev->is_pcie || dev->devfn)
+ return;
+
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
+ if (!pos)
+ return;
+
+ bridge = dev->bus->self;
+ if (!bridge || !bridge->is_pcie)
+ return;
+
+ pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
+ if (!pos)
+ return;
+
+ pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap);
+ if (!(cap & PCI_EXP_DEVCAP2_ARI))
+ return;
+
+ pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2, &ctrl);
+ ctrl |= PCI_EXP_DEVCTL2_ARI;
+ pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl);
+
+ bridge->ari_enabled = 1;
+}
+
int
pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
{
EXPORT_SYMBOL(pci_set_dma_seg_boundary);
#endif
+/**
+ * pci_execute_reset_function() - Reset a PCI device function
+ * @dev: Device function to reset
+ *
+ * Some devices allow an individual function to be reset without affecting
+ * other functions in the same device. The PCI device must be responsive
+ * to PCI config space in order to use this function.
+ *
+ * The device function is presumed to be unused when this function is called.
+ * Resetting the device will make the contents of PCI configuration space
+ * random, so any caller of this must be prepared to reinitialise the
+ * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
+ * etc.
+ *
+ * Returns 0 if the device function was successfully reset or -ENOTTY if the
+ * device doesn't support resetting a single function.
+ */
+int pci_execute_reset_function(struct pci_dev *dev)
+{
+ u16 status;
+ u32 cap;
+ int exppos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+
+ if (!exppos)
+ return -ENOTTY;
+ pci_read_config_dword(dev, exppos + PCI_EXP_DEVCAP, &cap);
+ if (!(cap & PCI_EXP_DEVCAP_FLR))
+ return -ENOTTY;
+
+ pci_block_user_cfg_access(dev);
+
+ /* Wait for Transaction Pending bit clean */
+ msleep(100);
+ pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
+ if (status & PCI_EXP_DEVSTA_TRPND) {
+ dev_info(&dev->dev, "Busy after 100ms while trying to reset; "
+ "sleeping for 1 second\n");
+ ssleep(1);
+ pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
+ if (status & PCI_EXP_DEVSTA_TRPND)
+ dev_info(&dev->dev, "Still busy after 1s; "
+ "proceeding with reset anyway\n");
+ }
+
+ pci_write_config_word(dev, exppos + PCI_EXP_DEVCTL,
+ PCI_EXP_DEVCTL_BCR_FLR);
+ mdelay(100);
+
+ pci_unblock_user_cfg_access(dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pci_execute_reset_function);
+
+/**
+ * pci_reset_function() - quiesce and reset a PCI device function
+ * @dev: Device function to reset
+ *
+ * Some devices allow an individual function to be reset without affecting
+ * other functions in the same device. The PCI device must be responsive
+ * to PCI config space in order to use this function.
+ *
+ * This function does not just reset the PCI portion of a device, but
+ * clears all the state associated with the device. This function differs
+ * from pci_execute_reset_function in that it saves and restores device state
+ * over the reset.
+ *
+ * Returns 0 if the device function was successfully reset or -ENOTTY if the
+ * device doesn't support resetting a single function.
+ */
+int pci_reset_function(struct pci_dev *dev)
+{
+ u32 cap;
+ int exppos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+ int r;
+
+ if (!exppos)
+ return -ENOTTY;
+ pci_read_config_dword(dev, exppos + PCI_EXP_DEVCAP, &cap);
+ if (!(cap & PCI_EXP_DEVCAP_FLR))
+ return -ENOTTY;
+
+ if (!dev->msi_enabled && !dev->msix_enabled)
+ disable_irq(dev->irq);
+ pci_save_state(dev);
+
+ pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
+
+ r = pci_execute_reset_function(dev);
+
+ pci_restore_state(dev);
+ if (!dev->msi_enabled && !dev->msix_enabled)
+ enable_irq(dev->irq);
+
+ return r;
+}
+EXPORT_SYMBOL_GPL(pci_reset_function);
+
/**
* pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
* @dev: PCI device to query
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
pci_fixup_device(pci_fixup_final, dev);
}
+
+ msi_init();
+
return 0;
}
EXPORT_SYMBOL(pci_pme_capable);
EXPORT_SYMBOL(pci_pme_active);
EXPORT_SYMBOL(pci_enable_wake);
+EXPORT_SYMBOL(pci_wake_from_d3);
EXPORT_SYMBOL(pci_target_state);
EXPORT_SYMBOL(pci_prepare_to_sleep);
EXPORT_SYMBOL(pci_back_from_sleep);
projects / linux-2.6-omap-h63xx.git / blobdiff