bcma: support for suspend and resume

bcma used to lock up machine without enabling PCI or initializing CC.

Cc: stable@vger.kernel.org
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 56 insertions, 0 deletions

diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h
index 30a3085d3354..fda56bde36b8 100644
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -18,6 +18,9 @@ void bcma_bus_unregister(struct bcma_bus *bus);
 int __init bcma_bus_early_register(struct bcma_bus *bus,
                                    struct bcma_device *core_cc,
                                    struct bcma_device *core_mips);
+#ifdef CONFIG_PM
+int bcma_bus_resume(struct bcma_bus *bus);
+#endif
 
 /* scan.c */
 int bcma_bus_scan(struct bcma_bus *bus);
diff --git a/drivers/bcma/host_pci.c b/drivers/bcma/host_pci.c
index b0994c0e05dc..443b83a2fd7a 100644
--- a/drivers/bcma/host_pci.c
+++ b/drivers/bcma/host_pci.c
@@ -234,6 +234,41 @@ static void bcma_host_pci_remove(struct pci_dev *dev)
         pci_set_drvdata(dev, NULL);
 }
 
+#ifdef CONFIG_PM
+static int bcma_host_pci_suspend(struct pci_dev *dev, pm_message_t state)
+{
+        /* Host specific */
+        pci_save_state(dev);
+        pci_disable_device(dev);
+        pci_set_power_state(dev, pci_choose_state(dev, state));
+
+        return 0;
+}
+
+static int bcma_host_pci_resume(struct pci_dev *dev)
+{
+        struct bcma_bus *bus = pci_get_drvdata(dev);
+        int err;
+
+        /* Host specific */
+        pci_set_power_state(dev, 0);
+        err = pci_enable_device(dev);
+        if (err)
+                return err;
+        pci_restore_state(dev);
+
+        /* Bus specific */
+        err = bcma_bus_resume(bus);
+        if (err)
+                return err;
+
+        return 0;
+}
+#else /* CONFIG_PM */
+# define bcma_host_pci_suspend  NULL
+# define bcma_host_pci_resume   NULL
+#endif /* CONFIG_PM */
+
 static DEFINE_PCI_DEVICE_TABLE(bcma_pci_bridge_tbl) = {
         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
@@ -249,6 +284,8 @@ static struct pci_driver bcma_pci_bridge_driver = {
         .id_table = bcma_pci_bridge_tbl,
         .probe = bcma_host_pci_probe,
         .remove = bcma_host_pci_remove,
+        .suspend = bcma_host_pci_suspend,
+        .resume = bcma_host_pci_resume,
 };
 
 int __init bcma_host_pci_init(void)
diff --git a/drivers/bcma/main.c b/drivers/bcma/main.c
index 70c84b951098..10f92b371e58 100644
--- a/drivers/bcma/main.c
+++ b/drivers/bcma/main.c
@@ -240,6 +240,22 @@ int __init bcma_bus_early_register(struct bcma_bus *bus,
         return 0;
 }
 
+#ifdef CONFIG_PM
+int bcma_bus_resume(struct bcma_bus *bus)
+{
+        struct bcma_device *core;
+
+        /* Init CC core */
+        core = bcma_find_core(bus, BCMA_CORE_CHIPCOMMON);
+        if (core) {
+                bus->drv_cc.setup_done = false;
+                bcma_core_chipcommon_init(&bus->drv_cc);
+        }
+
+        return 0;
+}
+#endif
+
 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 {
         drv->drv.name = drv->name;