cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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komeda_drv.c (4530B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
      4 * Author: James.Qian.Wang <james.qian.wang@arm.com>
      5 *
      6 */
      7#include <linux/module.h>
      8#include <linux/kernel.h>
      9#include <linux/platform_device.h>
     10#include <linux/component.h>
     11#include <linux/pm_runtime.h>
     12#include <drm/drm_module.h>
     13#include <drm/drm_of.h>
     14#include "komeda_dev.h"
     15#include "komeda_kms.h"
     16
     17struct komeda_drv {
     18	struct komeda_dev *mdev;
     19	struct komeda_kms_dev *kms;
     20};
     21
     22struct komeda_dev *dev_to_mdev(struct device *dev)
     23{
     24	struct komeda_drv *mdrv = dev_get_drvdata(dev);
     25
     26	return mdrv ? mdrv->mdev : NULL;
     27}
     28
     29static void komeda_unbind(struct device *dev)
     30{
     31	struct komeda_drv *mdrv = dev_get_drvdata(dev);
     32
     33	if (!mdrv)
     34		return;
     35
     36	komeda_kms_detach(mdrv->kms);
     37
     38	if (pm_runtime_enabled(dev))
     39		pm_runtime_disable(dev);
     40	else
     41		komeda_dev_suspend(mdrv->mdev);
     42
     43	komeda_dev_destroy(mdrv->mdev);
     44
     45	dev_set_drvdata(dev, NULL);
     46	devm_kfree(dev, mdrv);
     47}
     48
     49static int komeda_bind(struct device *dev)
     50{
     51	struct komeda_drv *mdrv;
     52	int err;
     53
     54	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
     55	if (!mdrv)
     56		return -ENOMEM;
     57
     58	mdrv->mdev = komeda_dev_create(dev);
     59	if (IS_ERR(mdrv->mdev)) {
     60		err = PTR_ERR(mdrv->mdev);
     61		goto free_mdrv;
     62	}
     63
     64	pm_runtime_enable(dev);
     65	if (!pm_runtime_enabled(dev))
     66		komeda_dev_resume(mdrv->mdev);
     67
     68	mdrv->kms = komeda_kms_attach(mdrv->mdev);
     69	if (IS_ERR(mdrv->kms)) {
     70		err = PTR_ERR(mdrv->kms);
     71		goto destroy_mdev;
     72	}
     73
     74	dev_set_drvdata(dev, mdrv);
     75
     76	return 0;
     77
     78destroy_mdev:
     79	if (pm_runtime_enabled(dev))
     80		pm_runtime_disable(dev);
     81	else
     82		komeda_dev_suspend(mdrv->mdev);
     83
     84	komeda_dev_destroy(mdrv->mdev);
     85
     86free_mdrv:
     87	devm_kfree(dev, mdrv);
     88	return err;
     89}
     90
     91static const struct component_master_ops komeda_master_ops = {
     92	.bind	= komeda_bind,
     93	.unbind	= komeda_unbind,
     94};
     95
     96static void komeda_add_slave(struct device *master,
     97			     struct component_match **match,
     98			     struct device_node *np,
     99			     u32 port, u32 endpoint)
    100{
    101	struct device_node *remote;
    102
    103	remote = of_graph_get_remote_node(np, port, endpoint);
    104	if (remote) {
    105		drm_of_component_match_add(master, match, component_compare_of, remote);
    106		of_node_put(remote);
    107	}
    108}
    109
    110static int komeda_platform_probe(struct platform_device *pdev)
    111{
    112	struct device *dev = &pdev->dev;
    113	struct component_match *match = NULL;
    114	struct device_node *child;
    115
    116	if (!dev->of_node)
    117		return -ENODEV;
    118
    119	for_each_available_child_of_node(dev->of_node, child) {
    120		if (of_node_cmp(child->name, "pipeline") != 0)
    121			continue;
    122
    123		/* add connector */
    124		komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 0);
    125		komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 1);
    126	}
    127
    128	return component_master_add_with_match(dev, &komeda_master_ops, match);
    129}
    130
    131static int komeda_platform_remove(struct platform_device *pdev)
    132{
    133	component_master_del(&pdev->dev, &komeda_master_ops);
    134	return 0;
    135}
    136
    137static const struct of_device_id komeda_of_match[] = {
    138	{ .compatible = "arm,mali-d71", .data = d71_identify, },
    139	{ .compatible = "arm,mali-d32", .data = d71_identify, },
    140	{},
    141};
    142
    143MODULE_DEVICE_TABLE(of, komeda_of_match);
    144
    145static int __maybe_unused komeda_rt_pm_suspend(struct device *dev)
    146{
    147	struct komeda_drv *mdrv = dev_get_drvdata(dev);
    148
    149	return komeda_dev_suspend(mdrv->mdev);
    150}
    151
    152static int __maybe_unused komeda_rt_pm_resume(struct device *dev)
    153{
    154	struct komeda_drv *mdrv = dev_get_drvdata(dev);
    155
    156	return komeda_dev_resume(mdrv->mdev);
    157}
    158
    159static int __maybe_unused komeda_pm_suspend(struct device *dev)
    160{
    161	struct komeda_drv *mdrv = dev_get_drvdata(dev);
    162	int res;
    163
    164	res = drm_mode_config_helper_suspend(&mdrv->kms->base);
    165
    166	if (!pm_runtime_status_suspended(dev))
    167		komeda_dev_suspend(mdrv->mdev);
    168
    169	return res;
    170}
    171
    172static int __maybe_unused komeda_pm_resume(struct device *dev)
    173{
    174	struct komeda_drv *mdrv = dev_get_drvdata(dev);
    175
    176	if (!pm_runtime_status_suspended(dev))
    177		komeda_dev_resume(mdrv->mdev);
    178
    179	return drm_mode_config_helper_resume(&mdrv->kms->base);
    180}
    181
    182static const struct dev_pm_ops komeda_pm_ops = {
    183	SET_SYSTEM_SLEEP_PM_OPS(komeda_pm_suspend, komeda_pm_resume)
    184	SET_RUNTIME_PM_OPS(komeda_rt_pm_suspend, komeda_rt_pm_resume, NULL)
    185};
    186
    187static struct platform_driver komeda_platform_driver = {
    188	.probe	= komeda_platform_probe,
    189	.remove	= komeda_platform_remove,
    190	.driver	= {
    191		.name = "komeda",
    192		.of_match_table	= komeda_of_match,
    193		.pm = &komeda_pm_ops,
    194	},
    195};
    196
    197drm_module_platform_driver(komeda_platform_driver);
    198
    199MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");
    200MODULE_DESCRIPTION("Komeda KMS driver");
    201MODULE_LICENSE("GPL v2");