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}