From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932517AbdJZN3s (ORCPT ); Thu, 26 Oct 2017 09:29:48 -0400 Received: from regular1.263xmail.com ([211.150.99.133]:38375 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932382AbdJZN3o (ORCPT ); Thu, 26 Oct 2017 09:29:44 -0400 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: jeffy.chen@rock-chips.com X-FST-TO: linux-kernel@vger.kernel.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: jeffy.chen@rock-chips.com X-UNIQUE-TAG: <2df17aa668dbfe329e73c3278a00ea7f> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Jeffy Chen To: linux-kernel@vger.kernel.org, bhelgaas@google.com Cc: linux-pm@vger.kernel.org, tony@atomide.com, shawn.lin@rock-chips.com, briannorris@chromium.org, rjw@rjwysocki.net, dianders@chromium.org, Jeffy Chen , linux-pci@vger.kernel.org Subject: [RFC PATCH v8 7/7] PCI / PM: Add support for the PCIe WAKE# signal for OF Date: Thu, 26 Oct 2017 21:28:40 +0800 Message-Id: <20171026132840.20946-8-jeffy.chen@rock-chips.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171026132840.20946-1-jeffy.chen@rock-chips.com> References: <20171026132840.20946-1-jeffy.chen@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add pci-of.c to handle the PCIe WAKE# interrupt. Also use the dedicated wakeirq infrastructure to simplify it. Signed-off-by: Jeffy Chen --- Changes in v8: Add pci-of.c and use platform_pm_ops to handle the PCIe WAKE# signal. Changes in v7: Move PCIE_WAKE handling into pci core. Changes in v6: Fix device_init_wake error handling, and add some comments. Changes in v5: Rebase. Changes in v3: Fix error handling. Changes in v2: Use dev_pm_set_dedicated_wake_irq. drivers/pci/Makefile | 2 +- drivers/pci/pci-of.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 137 insertions(+), 1 deletion(-) create mode 100644 drivers/pci/pci-of.c diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index 66a21acad952..4f76dbdb024c 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -49,7 +49,7 @@ obj-$(CONFIG_PCI_ECAM) += ecam.o obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o -obj-$(CONFIG_OF) += of.o +obj-$(CONFIG_OF) += of.o pci-of.o ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG diff --git a/drivers/pci/pci-of.c b/drivers/pci/pci-of.c new file mode 100644 index 000000000000..55a33206fc84 --- /dev/null +++ b/drivers/pci/pci-of.c @@ -0,0 +1,136 @@ +/* + * OF PCI PM support + * + * Copyright (c) 2017 Rockchip, Inc. + * + * Author: Jeffy Chen + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include "pci.h" + +struct of_pci_pm_data { + struct device *dev; + unsigned int wakeup_irq; + atomic_t wakeup_cnt; +}; + +static void *of_pci_setup(struct device *dev) +{ + struct of_pci_pm_data *data; + int irq; + + if (!dev->of_node) + return NULL; + + data = devm_kzalloc(dev, sizeof(struct of_pci_pm_data), GFP_KERNEL); + if (!data) + return ERR_PTR(-ENOMEM); + + irq = of_irq_get_byname(dev->of_node, "wakeup"); + if (irq < 0) { + if (irq == -EPROBE_DEFER) + return ERR_PTR(irq); + + return NULL; + } + + data->wakeup_irq = irq; + data->dev = dev; + + device_init_wakeup(dev, false); + + dev_info(dev, "Wakeup IRQ %d\n", irq); + return data; +} + +static void *of_pci_setup_dev(struct pci_dev *pci_dev) +{ + return of_pci_setup(&pci_dev->dev); +} + +static void *of_pci_setup_host_bridge(struct pci_host_bridge *bridge) +{ + return of_pci_setup(bridge->dev.parent); +} + +static void of_pci_cleanup(void *pmdata) +{ + struct of_pci_pm_data *data = pmdata; + + if (IS_ERR_OR_NULL(data)) { + device_init_wakeup(data->dev, false); + dev_pm_clear_wake_irq(data->dev); + } +} + +static bool of_pci_can_wakeup(void *pmdata) +{ + struct of_pci_pm_data *data = pmdata; + + if (IS_ERR_OR_NULL(data)) + return false; + + return data->wakeup_irq > 0; +} + +static int of_pci_dev_wakeup(void *pmdata, bool enable) +{ + struct of_pci_pm_data *data = pmdata; + struct device *dev = data->dev; + int ret; + + if (!enable) { + dev_pm_clear_wake_irq(dev); + return device_set_wakeup_enable(dev, false); + } + + ret = device_set_wakeup_enable(dev, true); + if (ret < 0) + return ret; + + ret = dev_pm_set_dedicated_wake_irq(dev, data->wakeup_irq); + if (ret < 0) { + device_set_wakeup_enable(dev, false); + return ret; + } + + return 0; +} + +static int of_pci_bridge_wakeup(void *pmdata, bool enable) +{ + struct of_pci_pm_data *data = pmdata; + + if (enable && atomic_inc_return(&data->wakeup_cnt) != 1) + return 0; + + if (!enable && atomic_dec_return(&data->wakeup_cnt) != 0) + return 0; + + return of_pci_dev_wakeup(pmdata, enable); +} + +static const struct pci_platform_pm_ops of_pci_platform_pm = { + .setup_dev = of_pci_setup_dev, + .setup_host_bridge = of_pci_setup_host_bridge, + .cleanup = of_pci_cleanup, + .can_wakeup = of_pci_can_wakeup, + .dev_wakeup = of_pci_dev_wakeup, + .bridge_wakeup = of_pci_bridge_wakeup, +}; + +static int __init of_pci_init(void) +{ + pci_set_platform_pm(&of_pci_platform_pm); + return 0; +} +arch_initcall(of_pci_init); -- 2.11.0