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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 - 2024 Intel Corporation
*/
#include <linux/auxiliary_bus.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "ipu6.h"
#include "ipu6-bus.h"
#include "ipu6-buttress.h"
#include "ipu6-dma.h"
static int bus_pm_runtime_suspend(struct device *dev)
{
struct ipu6_bus_device *adev = to_ipu6_bus_device(dev);
int ret;
ret = pm_generic_runtime_suspend(dev);
if (ret)
return ret;
ret = ipu6_buttress_power(dev, adev->ctrl, false);
if (!ret)
return 0;
dev_err(dev, "power down failed!\n");
/* Powering down failed, attempt to resume device now */
ret = pm_generic_runtime_resume(dev);
if (!ret)
return -EBUSY;
return -EIO;
}
static int bus_pm_runtime_resume(struct device *dev)
{
struct ipu6_bus_device *adev = to_ipu6_bus_device(dev);
int ret;
ret = ipu6_buttress_power(dev, adev->ctrl, true);
if (ret)
return ret;
ret = pm_generic_runtime_resume(dev);
if (ret)
goto out_err;
return 0;
out_err:
ipu6_buttress_power(dev, adev->ctrl, false);
return -EBUSY;
}
static struct dev_pm_domain ipu6_bus_pm_domain = {
.ops = {
.runtime_suspend = bus_pm_runtime_suspend,
.runtime_resume = bus_pm_runtime_resume,
},
};
static DEFINE_MUTEX(ipu6_bus_mutex);
static void ipu6_bus_release(struct device *dev)
{
struct ipu6_bus_device *adev = to_ipu6_bus_device(dev);
kfree(adev->pdata);
kfree(adev);
}
struct ipu6_bus_device *
ipu6_bus_initialize_device(struct pci_dev *pdev, struct device *parent,
void *pdata, struct ipu6_buttress_ctrl *ctrl,
char *name)
{
struct auxiliary_device *auxdev;
struct ipu6_bus_device *adev;
struct ipu6_device *isp = pci_get_drvdata(pdev);
int ret;
adev = kzalloc(sizeof(*adev), GFP_KERNEL);
if (!adev)
return ERR_PTR(-ENOMEM);
adev->dma_mask = DMA_BIT_MASK(isp->secure_mode ? IPU6_MMU_ADDR_BITS :
IPU6_MMU_ADDR_BITS_NON_SECURE);
adev->isp = isp;
adev->ctrl = ctrl;
adev->pdata = pdata;
auxdev = &adev->auxdev;
auxdev->name = name;
auxdev->id = (pci_domain_nr(pdev->bus) << 16) |
PCI_DEVID(pdev->bus->number, pdev->devfn);
auxdev->dev.parent = parent;
auxdev->dev.release = ipu6_bus_release;
auxdev->dev.dma_ops = &ipu6_dma_ops;
auxdev->dev.dma_mask = &adev->dma_mask;
auxdev->dev.dma_parms = pdev->dev.dma_parms;
auxdev->dev.coherent_dma_mask = adev->dma_mask;
ret = auxiliary_device_init(auxdev);
if (ret < 0) {
dev_err(&isp->pdev->dev, "auxiliary device init failed (%d)\n",
ret);
kfree(adev);
return ERR_PTR(ret);
}
dev_pm_domain_set(&auxdev->dev, &ipu6_bus_pm_domain);
pm_runtime_forbid(&adev->auxdev.dev);
pm_runtime_enable(&adev->auxdev.dev);
return adev;
}
int ipu6_bus_add_device(struct ipu6_bus_device *adev)
{
struct auxiliary_device *auxdev = &adev->auxdev;
int ret;
ret = auxiliary_device_add(auxdev);
if (ret) {
auxiliary_device_uninit(auxdev);
return ret;
}
mutex_lock(&ipu6_bus_mutex);
list_add(&adev->list, &adev->isp->devices);
mutex_unlock(&ipu6_bus_mutex);
pm_runtime_allow(&auxdev->dev);
return 0;
}
void ipu6_bus_del_devices(struct pci_dev *pdev)
{
struct ipu6_device *isp = pci_get_drvdata(pdev);
struct ipu6_bus_device *adev, *save;
mutex_lock(&ipu6_bus_mutex);
list_for_each_entry_safe(adev, save, &isp->devices, list) {
pm_runtime_disable(&adev->auxdev.dev);
list_del(&adev->list);
auxiliary_device_delete(&adev->auxdev);
auxiliary_device_uninit(&adev->auxdev);
}
mutex_unlock(&ipu6_bus_mutex);
}
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