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	spin_lock(&tidss->wait_lock);
 64	irqstatus = dispc_read_and_clear_irqstatus(tidss->dispc);
 65	spin_unlock(&tidss->wait_lock);
 66
 67	for (id = 0; id < tidss->num_crtcs; id++) {
 68		struct drm_crtc *crtc = tidss->crtcs[id];
 69		struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 70		u32 hw_videoport = tcrtc->hw_videoport;
 71
 72		if (irqstatus & (DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
 73				 DSS_IRQ_VP_VSYNC_ODD(hw_videoport)))
 74			tidss_crtc_vblank_irq(crtc);
 75
 76		if (irqstatus & (DSS_IRQ_VP_FRAME_DONE(hw_videoport)))
 77			tidss_crtc_framedone_irq(crtc);
 78
 79		if (irqstatus & DSS_IRQ_VP_SYNC_LOST(hw_videoport))
 80			tidss_crtc_error_irq(crtc, irqstatus);
 81	}
 82
 83	if (irqstatus & DSS_IRQ_DEVICE_OCP_ERR)
 84		dev_err_ratelimited(tidss->dev, "OCP error\n");
 85
 86	return IRQ_HANDLED;
 87}
 88
 89void tidss_irq_resume(struct tidss_device *tidss)
 90{
 91	unsigned long flags;
 92
 93	spin_lock_irqsave(&tidss->wait_lock, flags);
 94	tidss_irq_update(tidss);
 95	spin_unlock_irqrestore(&tidss->wait_lock, flags);
 96}
 97
 98int tidss_irq_install(struct drm_device *ddev, unsigned int irq)
 99{
100	struct tidss_device *tidss = to_tidss(ddev);
101	int ret;
102
103	if (irq == IRQ_NOTCONNECTED)
104		return -ENOTCONN;
105
106	ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev);
107	if (ret)
108		return ret;
109
110	tidss->irq_mask = DSS_IRQ_DEVICE_OCP_ERR;
111
112	for (unsigned int i = 0; i < tidss->num_crtcs; ++i) {
113		struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]);
114
115		tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport);
116
117		tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport);
118	}
119
120	return 0;
121}
122
123void tidss_irq_uninstall(struct drm_device *ddev)
124{
125	struct tidss_device *tidss = to_tidss(ddev);
126
127	free_irq(tidss->irq, ddev);
128}