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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tidss_irq.c (4057B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
      4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
      5 */
      6
      7#include <linux/platform_device.h>
      8
      9#include <drm/drm_drv.h>
     10#include <drm/drm_print.h>
     11
     12#include "tidss_crtc.h"
     13#include "tidss_dispc.h"
     14#include "tidss_drv.h"
     15#include "tidss_irq.h"
     16#include "tidss_plane.h"
     17
     18/* call with wait_lock and dispc runtime held */
     19static void tidss_irq_update(struct tidss_device *tidss)
     20{
     21	assert_spin_locked(&tidss->wait_lock);
     22
     23	dispc_set_irqenable(tidss->dispc, tidss->irq_mask);
     24}
     25
     26void tidss_irq_enable_vblank(struct drm_crtc *crtc)
     27{
     28	struct drm_device *ddev = crtc->dev;
     29	struct tidss_device *tidss = to_tidss(ddev);
     30	struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
     31	u32 hw_videoport = tcrtc->hw_videoport;
     32	unsigned long flags;
     33
     34	spin_lock_irqsave(&tidss->wait_lock, flags);
     35	tidss->irq_mask |= DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
     36			   DSS_IRQ_VP_VSYNC_ODD(hw_videoport);
     37	tidss_irq_update(tidss);
     38	spin_unlock_irqrestore(&tidss->wait_lock, flags);
     39}
     40
     41void tidss_irq_disable_vblank(struct drm_crtc *crtc)
     42{
     43	struct drm_device *ddev = crtc->dev;
     44	struct tidss_device *tidss = to_tidss(ddev);
     45	struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
     46	u32 hw_videoport = tcrtc->hw_videoport;
     47	unsigned long flags;
     48
     49	spin_lock_irqsave(&tidss->wait_lock, flags);
     50	tidss->irq_mask &= ~(DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
     51			     DSS_IRQ_VP_VSYNC_ODD(hw_videoport));
     52	tidss_irq_update(tidss);
     53	spin_unlock_irqrestore(&tidss->wait_lock, flags);
     54}
     55
     56static irqreturn_t tidss_irq_handler(int irq, void *arg)
     57{
     58	struct drm_device *ddev = (struct drm_device *)arg;
     59	struct tidss_device *tidss = to_tidss(ddev);
     60	unsigned int id;
     61	dispc_irq_t irqstatus;
     62
     63	irqstatus = dispc_read_and_clear_irqstatus(tidss->dispc);
     64
     65	for (id = 0; id < tidss->num_crtcs; id++) {
     66		struct drm_crtc *crtc = tidss->crtcs[id];
     67		struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
     68		u32 hw_videoport = tcrtc->hw_videoport;
     69
     70		if (irqstatus & (DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
     71				 DSS_IRQ_VP_VSYNC_ODD(hw_videoport)))
     72			tidss_crtc_vblank_irq(crtc);
     73
     74		if (irqstatus & (DSS_IRQ_VP_FRAME_DONE(hw_videoport)))
     75			tidss_crtc_framedone_irq(crtc);
     76
     77		if (irqstatus & DSS_IRQ_VP_SYNC_LOST(hw_videoport))
     78			tidss_crtc_error_irq(crtc, irqstatus);
     79	}
     80
     81	if (irqstatus & DSS_IRQ_DEVICE_OCP_ERR)
     82		dev_err_ratelimited(tidss->dev, "OCP error\n");
     83
     84	return IRQ_HANDLED;
     85}
     86
     87void tidss_irq_resume(struct tidss_device *tidss)
     88{
     89	unsigned long flags;
     90
     91	spin_lock_irqsave(&tidss->wait_lock, flags);
     92	tidss_irq_update(tidss);
     93	spin_unlock_irqrestore(&tidss->wait_lock, flags);
     94}
     95
     96static void tidss_irq_preinstall(struct drm_device *ddev)
     97{
     98	struct tidss_device *tidss = to_tidss(ddev);
     99
    100	spin_lock_init(&tidss->wait_lock);
    101
    102	tidss_runtime_get(tidss);
    103
    104	dispc_set_irqenable(tidss->dispc, 0);
    105	dispc_read_and_clear_irqstatus(tidss->dispc);
    106
    107	tidss_runtime_put(tidss);
    108}
    109
    110static void tidss_irq_postinstall(struct drm_device *ddev)
    111{
    112	struct tidss_device *tidss = to_tidss(ddev);
    113	unsigned long flags;
    114	unsigned int i;
    115
    116	tidss_runtime_get(tidss);
    117
    118	spin_lock_irqsave(&tidss->wait_lock, flags);
    119
    120	tidss->irq_mask = DSS_IRQ_DEVICE_OCP_ERR;
    121
    122	for (i = 0; i < tidss->num_crtcs; ++i) {
    123		struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]);
    124
    125		tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport);
    126
    127		tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport);
    128	}
    129
    130	tidss_irq_update(tidss);
    131
    132	spin_unlock_irqrestore(&tidss->wait_lock, flags);
    133
    134	tidss_runtime_put(tidss);
    135}
    136
    137int tidss_irq_install(struct drm_device *ddev, unsigned int irq)
    138{
    139	int ret;
    140
    141	if (irq == IRQ_NOTCONNECTED)
    142		return -ENOTCONN;
    143
    144	tidss_irq_preinstall(ddev);
    145
    146	ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev);
    147	if (ret)
    148		return ret;
    149
    150	tidss_irq_postinstall(ddev);
    151
    152	return 0;
    153}
    154
    155void tidss_irq_uninstall(struct drm_device *ddev)
    156{
    157	struct tidss_device *tidss = to_tidss(ddev);
    158
    159	tidss_runtime_get(tidss);
    160	dispc_set_irqenable(tidss->dispc, 0);
    161	tidss_runtime_put(tidss);
    162
    163	free_irq(tidss->irq, ddev);
    164}