Changeset 732 for GPL/branches/uniaud32-next/lib32/pci.c

Timestamp:

Sep 11, 2022, 3:09:04 AM (3 years ago)

Author:

Paul Smedley

Message:

Code cleanups

File:

• GPL/branches/uniaud32-next/lib32/pci.c (modified) (1 diff)

GPL/branches/uniaud32-next/lib32/pci.c

@@ -1156 +1156 @@
 }
 EXPORT_SYMBOL(__devm_request_region);
+
+/*
+ * Managed PCI resources.  This manages device on/off, INTx/MSI/MSI-X
+ * on/off and BAR regions.  pci_dev itself records MSI/MSI-X status, so
+ * there's no need to track it separately.  pci_devres is initialized
+ * when a device is enabled using managed PCI device enable interface.
+ */
+struct pci_devres {
+        unsigned int enabled:1;
+        unsigned int pinned:1;
+        unsigned int orig_intx:1;
+        unsigned int restore_intx:1;
+        unsigned int mwi:1;
+        u32 region_mask;
+};
+
+static void pcim_release(struct device *gendev, void *res)
+{
+}
+
+static struct pci_devres *find_pci_dr(struct pci_dev *pdev)
+{
+        if (pci_is_managed(pdev))
+                return devres_find(&pdev->dev, pcim_release, NULL, NULL);
+        return NULL;
+}
+
+/**
+ * pci_intx - enables/disables PCI INTx for device dev
+ * @pdev: the PCI device to operate on
+ * @enable: boolean: whether to enable or disable PCI INTx
+ *
+ * Enables/disables PCI INTx for device @pdev
+ */
+void pci_intx(struct pci_dev *pdev, int enable)
+{
+        u16 pci_command, new;
+
+        pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
+
+        if (enable)
+                new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
+        else
+                new = pci_command | PCI_COMMAND_INTX_DISABLE;
+
+        if (new != pci_command) {
+                struct pci_devres *dr;
+
+                pci_write_config_word(pdev, PCI_COMMAND, new);
+
+                dr = find_pci_dr(pdev);
+                if (dr && !dr->restore_intx) {
+                        dr->restore_intx = 1;
+                        dr->orig_intx = !enable;
+                }
+        }
+}
+EXPORT_SYMBOL_GPL(pci_intx);