ipu7-bus.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2013 - 2025 Intel Corporation
  4 */
  5
  6#include <linux/auxiliary_bus.h>
  7#include <linux/device.h>
  8#include <linux/dma-mapping.h>
  9#include <linux/err.h>
 10#include <linux/list.h>
 11#include <linux/mutex.h>
 12#include <linux/pci.h>
 13#include <linux/pm_domain.h>
 14#include <linux/pm_runtime.h>
 15#include <linux/slab.h>
 16
 17#include "ipu7.h"
 18#include "ipu7-bus.h"
 19#include "ipu7-boot.h"
 20#include "ipu7-dma.h"
 21
 22static int bus_pm_runtime_suspend(struct device *dev)
 23{
 24	struct ipu7_bus_device *adev = to_ipu7_bus_device(dev);
 25	int ret;
 26
 27	ret = pm_generic_runtime_suspend(dev);
 28	if (ret)
 29		return ret;
 30
 31	ret = ipu_buttress_powerdown(dev, adev->ctrl);
 32	if (!ret)
 33		return 0;
 34
 35	dev_err(dev, "power down failed!\n");
 36
 37	/* Powering down failed, attempt to resume device now */
 38	ret = pm_generic_runtime_resume(dev);
 39	if (!ret)
 40		return -EBUSY;
 41
 42	return -EIO;
 43}
 44
 45static int bus_pm_runtime_resume(struct device *dev)
 46{
 47	struct ipu7_bus_device *adev = to_ipu7_bus_device(dev);
 48	int ret;
 49
 50	ret = ipu_buttress_powerup(dev, adev->ctrl);
 51	if (ret)
 52		return ret;
 53
 54	ret = pm_generic_runtime_resume(dev);
 55	if (ret)
 56		goto out_err;
 57
 58	return 0;
 59
 60out_err:
 61	ipu_buttress_powerdown(dev, adev->ctrl);
 62
 63	return -EBUSY;
 64}
 65
 66static struct dev_pm_domain ipu7_bus_pm_domain = {
 67	.ops = {
 68		.runtime_suspend = bus_pm_runtime_suspend,
 69		.runtime_resume = bus_pm_runtime_resume,
 70	},
 71};
 72
 73static DEFINE_MUTEX(ipu7_bus_mutex);
 74static void ipu7_bus_release(struct device *dev)
 75{
 76	struct ipu7_bus_device *adev = to_ipu7_bus_device(dev);
 77
 78	kfree(adev->pdata);
 79	kfree(adev);
 80}
 81
 82struct ipu7_bus_device *
 83ipu7_bus_initialize_device(struct pci_dev *pdev, struct device *parent,
 84			   void *pdata, const struct ipu_buttress_ctrl *ctrl,
 85			   const char *name)
 86{
 87	struct auxiliary_device *auxdev;
 88	struct ipu7_bus_device *adev;
 89	struct ipu7_device *isp = pci_get_drvdata(pdev);
 90	int ret;
 91
 92	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
 93	if (!adev)
 94		return ERR_PTR(-ENOMEM);
 95
 96	adev->isp = isp;
 97	adev->ctrl = ctrl;
 98	adev->pdata = pdata;
 99	auxdev = &adev->auxdev;
100	auxdev->name = name;
101	auxdev->id = (pci_domain_nr(pdev->bus) << 16) |
102		PCI_DEVID(pdev->bus->number, pdev->devfn);
103
104	auxdev->dev.parent = parent;
105	auxdev->dev.release = ipu7_bus_release;
106
107	ret = auxiliary_device_init(auxdev);
108	if (ret < 0) {
109		dev_err(&isp->pdev->dev, "auxiliary device init failed (%d)\n",
110			ret);
111		kfree(adev);
112		return ERR_PTR(ret);
113	}
114
115	dev_pm_domain_set(&auxdev->dev, &ipu7_bus_pm_domain);
116
117	pm_runtime_forbid(&adev->auxdev.dev);
118	pm_runtime_enable(&adev->auxdev.dev);
119
120	return adev;
121}
122
123int ipu7_bus_add_device(struct ipu7_bus_device *adev)
124{
125	struct auxiliary_device *auxdev = &adev->auxdev;
126	int ret;
127
128	ret = auxiliary_device_add(auxdev);
129	if (ret) {
130		auxiliary_device_uninit(auxdev);
131		return ret;
132	}
133
134	mutex_lock(&ipu7_bus_mutex);
135	list_add(&adev->list, &adev->isp->devices);
136	mutex_unlock(&ipu7_bus_mutex);
137
138	pm_runtime_allow(&auxdev->dev);
139
140	return 0;
141}
142
143void ipu7_bus_del_devices(struct pci_dev *pdev)
144{
145	struct ipu7_device *isp = pci_get_drvdata(pdev);
146	struct ipu7_bus_device *adev, *save;
147
148	mutex_lock(&ipu7_bus_mutex);
149
150	list_for_each_entry_safe(adev, save, &isp->devices, list) {
151		pm_runtime_disable(&adev->auxdev.dev);
152		list_del(&adev->list);
153		auxiliary_device_delete(&adev->auxdev);
154		auxiliary_device_uninit(&adev->auxdev);
155	}
156
157	mutex_unlock(&ipu7_bus_mutex);
158}