diff options
Diffstat (limited to 'drivers/soc/xilinx/zynqmp_power.c')
| -rw-r--r-- | drivers/soc/xilinx/zynqmp_power.c | 155 |
1 files changed, 134 insertions, 21 deletions
diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c index 965b1143936a..411d33f2fb05 100644 --- a/drivers/soc/xilinx/zynqmp_power.c +++ b/drivers/soc/xilinx/zynqmp_power.c @@ -30,9 +30,27 @@ struct zynqmp_pm_work_struct { u32 args[CB_ARG_CNT]; }; -static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work; +/** + * struct zynqmp_pm_event_info - event related information + * @cb_fun: Function pointer to store the callback function. + * @cb_type: Type of callback from pm_api_cb_id, + * PM_NOTIFY_CB - for Error Events, + * PM_INIT_SUSPEND_CB - for suspend callback. + * @node_id: Node-Id related to event. + * @event: Event Mask for the Error Event. + * @wake: Flag specifying whether the subsystem should be woken upon + * event notification. + */ +struct zynqmp_pm_event_info { + event_cb_func_t cb_fun; + enum pm_api_cb_id cb_type; + u32 node_id; + u32 event; + bool wake; +}; + +static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work, *zynqmp_pm_init_restart_work; static struct mbox_chan *rx_chan; -static bool event_registered; enum pm_suspend_mode { PM_SUSPEND_MODE_FIRST = 0, @@ -54,6 +72,19 @@ static void zynqmp_pm_get_callback_data(u32 *buf) zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, buf, 0); } +static void subsystem_restart_event_callback(const u32 *payload, void *data) +{ + /* First element is callback API ID, others are callback arguments */ + if (work_pending(&zynqmp_pm_init_restart_work->callback_work)) + return; + + /* Copy callback arguments into work's structure */ + memcpy(zynqmp_pm_init_restart_work->args, &payload[0], + sizeof(zynqmp_pm_init_restart_work->args)); + + queue_work(system_unbound_wq, &zynqmp_pm_init_restart_work->callback_work); +} + static void suspend_event_callback(const u32 *payload, void *data) { /* First element is callback API ID, others are callback arguments */ @@ -120,6 +151,37 @@ static void ipi_receive_callback(struct mbox_client *cl, void *data) } /** + * zynqmp_pm_subsystem_restart_work_fn - Initiate Subsystem restart + * @work: Pointer to work_struct + * + * Bottom-half of PM callback IRQ handler. + */ +static void zynqmp_pm_subsystem_restart_work_fn(struct work_struct *work) +{ + int ret; + struct zynqmp_pm_work_struct *pm_work = container_of(work, struct zynqmp_pm_work_struct, + callback_work); + + /* First element is callback API ID, others are callback arguments */ + if (pm_work->args[0] == PM_NOTIFY_CB) { + if (pm_work->args[2] == EVENT_SUBSYSTEM_RESTART) { + ret = zynqmp_pm_system_shutdown(ZYNQMP_PM_SHUTDOWN_TYPE_SETSCOPE_ONLY, + ZYNQMP_PM_SHUTDOWN_SUBTYPE_SUBSYSTEM); + if (ret) { + pr_err("unable to set shutdown scope\n"); + return; + } + + kernel_restart(NULL); + } else { + pr_err("%s Unsupported Event - %d\n", __func__, pm_work->args[2]); + } + } else { + pr_err("%s() Unsupported Callback %d\n", __func__, pm_work->args[0]); + } +} + +/** * zynqmp_pm_init_suspend_work_fn - Initialize suspend * @work: Pointer to work_struct * @@ -184,13 +246,51 @@ static ssize_t suspend_mode_store(struct device *dev, static DEVICE_ATTR_RW(suspend_mode); +static void unregister_event(struct device *dev, void *res) +{ + struct zynqmp_pm_event_info *event_info = res; + + xlnx_unregister_event(event_info->cb_type, event_info->node_id, + event_info->event, event_info->cb_fun, NULL); +} + +static int register_event(struct device *dev, const enum pm_api_cb_id cb_type, const u32 node_id, + const u32 event, const bool wake, event_cb_func_t cb_fun) +{ + int ret; + struct zynqmp_pm_event_info *event_info; + + event_info = devres_alloc(unregister_event, sizeof(struct zynqmp_pm_event_info), + GFP_KERNEL); + if (!event_info) + return -ENOMEM; + + event_info->cb_type = cb_type; + event_info->node_id = node_id; + event_info->event = event; + event_info->wake = wake; + event_info->cb_fun = cb_fun; + + ret = xlnx_register_event(event_info->cb_type, event_info->node_id, + event_info->event, event_info->wake, event_info->cb_fun, NULL); + if (ret) { + devres_free(event_info); + return ret; + } + + devres_add(dev, event_info); + return 0; +} + static int zynqmp_pm_probe(struct platform_device *pdev) { int ret, irq; - u32 pm_api_version; + u32 pm_api_version, pm_family_code, pm_sub_family_code, node_id; struct mbox_client *client; - zynqmp_pm_get_api_version(&pm_api_version); + ret = zynqmp_pm_get_api_version(&pm_api_version); + if (ret) + return ret; /* Check PM API version number */ if (pm_api_version < ZYNQMP_PM_VERSION) @@ -203,21 +303,43 @@ static int zynqmp_pm_probe(struct platform_device *pdev) * is not available to use) or -ENODEV(Xilinx Event Manager not compiled), * then use ipi-mailbox or interrupt method. */ - ret = xlnx_register_event(PM_INIT_SUSPEND_CB, 0, 0, false, - suspend_event_callback, NULL); + ret = register_event(&pdev->dev, PM_INIT_SUSPEND_CB, 0, 0, false, + suspend_event_callback); if (!ret) { zynqmp_pm_init_suspend_work = devm_kzalloc(&pdev->dev, sizeof(struct zynqmp_pm_work_struct), GFP_KERNEL); - if (!zynqmp_pm_init_suspend_work) { - xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, - suspend_event_callback, NULL); + if (!zynqmp_pm_init_suspend_work) return -ENOMEM; - } - event_registered = true; INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work, zynqmp_pm_init_suspend_work_fn); + + ret = zynqmp_pm_get_family_info(&pm_family_code, &pm_sub_family_code); + if (ret < 0) + return ret; + + if (pm_sub_family_code == VERSALNET_SUB_FAMILY_CODE) + node_id = PM_DEV_ACPU_0_0; + else + node_id = PM_DEV_ACPU_0; + + ret = register_event(&pdev->dev, PM_NOTIFY_CB, node_id, EVENT_SUBSYSTEM_RESTART, + false, subsystem_restart_event_callback); + if (ret) { + dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", + ret); + return ret; + } + + zynqmp_pm_init_restart_work = devm_kzalloc(&pdev->dev, + sizeof(struct zynqmp_pm_work_struct), + GFP_KERNEL); + if (!zynqmp_pm_init_restart_work) + return -ENOMEM; + + INIT_WORK(&zynqmp_pm_init_restart_work->callback_work, + zynqmp_pm_subsystem_restart_work_fn); } else if (ret != -EACCES && ret != -ENODEV) { dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", ret); return ret; @@ -264,15 +386,8 @@ static int zynqmp_pm_probe(struct platform_device *pdev) } ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr); - if (ret) { - if (event_registered) { - xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, suspend_event_callback, - NULL); - event_registered = false; - } - dev_err(&pdev->dev, "unable to create sysfs interface\n"); + if (ret) return ret; - } return 0; } @@ -280,8 +395,6 @@ static int zynqmp_pm_probe(struct platform_device *pdev) static void zynqmp_pm_remove(struct platform_device *pdev) { sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr); - if (event_registered) - xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, suspend_event_callback, NULL); if (!rx_chan) mbox_free_channel(rx_chan); |