/*
* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
* Parts of this file were based on sources as follows:
*
* Copyright (C) 2006-2008 Intel Corporation
* Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>
* Copyright (C) 2007 Dave Airlie <airlied@linux.ie>
* Copyright (C) 2011 Texas Instruments
* Copyright (C) 2017 Eric Anholt
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms of
* such GNU licence.
*/
#include <linux/clk.h>
#include <linux/version.h>
#include <linux/dma-buf.h>
#include <linux/of_graph.h>
#include <drm/drmP.h>
#include <drm/drm_panel.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include "tve200_drm.h"
irqreturn_t tve200_irq(int irq, void *data)
{
struct tve200_drm_dev_private *priv = data;
u32 stat;
u32 val;
stat = readl(priv->regs + TVE200_INT_STAT);
if (!stat)
return IRQ_NONE;
/*
* Vblank IRQ
*
* The hardware is a bit tilted: the line stays high after clearing
* the vblank IRQ, firing many more interrupts. We counter this
* by toggling the IRQ back and forth from firing at vblank and
* firing at start of active image, which works around the problem
* since those occur strictly in sequence, and we get two IRQs for each
* frame, one at start of Vblank (that we make call into the CRTC) and
* another one at the start of the image (that we discard).
*/
if (stat & TVE200_INT_V_STATUS) {
val = readl(priv->regs + TVE200_CTRL);
/* We have an actual start of vsync */
if (!(val & TVE200_VSTSTYPE_BITS)) {
drm_crtc_handle_vblank(&priv->pipe.crtc);
/* Toggle trigger to start of active image */
val |= TVE200_VSTSTYPE_VAI;
} else {
/* Toggle trigger back to start of vsync */
val &= ~TVE200_VSTSTYPE_BITS;
}
writel(val, priv->regs + TVE200_CTRL);
} else
dev_err(priv->drm->dev, "stray IRQ %08x\n", stat);
/* Clear the interrupt once done */
writel(stat, priv->regs + TVE200_INT_CLR);
return IRQ_HANDLED;
}
static int tve200_display_check(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *pstate,
struct drm_crtc_state *cstate)
{
const struct drm_display_mode *mode = &cstate->mode;
struct drm_framebuffer *old_fb = pipe->plane.state->fb;
struct drm_framebuffer *fb = pstate->fb;
/*
* We support these specific resolutions and nothing else.
*/
if (!(mode->hdisplay == 352 && mode->vdisplay == 240) && /* SIF(525) */
!(mode->hdisplay == 352 && mode->vdisplay == 288) && /* CIF(625) */
!(mode->hdisplay == 640 && mode->vdisplay == 480) && /* VGA */
!(mode->hdisplay == 720 && mode->vdisplay == 480) && /* D1 */
!(mode->hdisplay == 720 && mode->vdisplay == 576)) { /* D1 */
DRM_DEBUG_KMS("unsupported display mode (%u x %u)\n",
mode->hdisplay, mode->vdisplay);
return -EINVAL;
}
if (fb) {
u32 offset = drm_fb_cma_get_gem_addr(fb, pstate, 0);
/* FB base address must be dword aligned. */
if (offset & 3) {
DRM_DEBUG_KMS("FB not 32-bit aligned\n");
return -EINVAL;
}
/*
* There's no pitch register, the mode's hdisplay
* controls this.
*/
if (fb->pitches[0] != mode->hdisplay * fb->format->cpp[0]) {
DRM_DEBUG_KMS("can't handle pitches\n");
return -EINVAL;
}
/*
* We can't change the FB format in a flicker-free
* manner (and only update it during CRTC enable).
*/
if (old_fb && old_fb->format != fb->format)
cstate->mode_changed = true;
}
return 0;
}
static void tve200_display_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *cstate,
struct drm_plane_state *plane_state)
{
struct drm_crtc *crtc = &pipe->crtc;
struct drm_plane *plane = &pipe->plane;
struct drm_device *drm = crtc->dev;
struct tve200_drm_dev_private *priv = drm->dev_private;
const struct drm_display_mode *mode = &cstate->mode;
struct drm_framebuffer *fb = plane->state->fb;
struct drm_connector *connector = priv->connector;
u32 format = fb->format->format;
u32 ctrl1 = 0;
clk_prepare_enable(priv->clk);
/* Function 1 */
ctrl1 |= TVE200_CTRL_CSMODE;
/* Interlace mode for CCIR656: parameterize? */
ctrl1 |= TVE200_CTRL_NONINTERLACE;
/* 32 words per burst */
ctrl1 |= TVE200_CTRL_BURST_32_WORDS;
/* 16 retries */
ctrl1 |= TVE200_CTRL_RETRYCNT_16;
/* NTSC mode: parametrize? */
ctrl1 |= TVE200_CTRL_NTSC;
/* Vsync IRQ at start of Vsync at first */
ctrl1 |= TVE200_VSTSTYPE_VSYNC;
if (connector->display_info.bus_flags &
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
ctrl1 |= TVE200_CTRL_TVCLKP;
if ((mode->hdisplay == 352 && mode->vdisplay == 240) || /* SIF(525) */
(mode->hdisplay == 352 && mode->vdisplay == 288)) { /* CIF(625) */
ctrl1 |= TVE200_CTRL_IPRESOL_CIF;
dev_info(drm->dev, "CIF mode\n");
} else if (mode->hdisplay == 640 && mode->vdisplay == 480) {
ctrl1 |= TVE200_CTRL_IPRESOL_VGA;
dev_info(drm->dev, "VGA mode\n");
} else if ((mode->hdisplay == 720 && mode->vdisplay == 480) ||
(mode->hdisplay == 720 && mode->vdisplay == 576)) {
ctrl1 |= TVE200_CTRL_IPRESOL_D1;
dev_info(drm->dev, "D1 mode\n");
}
if (format & DRM_FORMAT_BIG_ENDIAN) {
ctrl1 |= TVE200_CTRL_BBBP;
format &= ~DRM_FORMAT_BIG_ENDIAN;
}
switch (format) {
case DRM_FORMAT_XRGB8888:
ctrl1 |= TVE200_IPDMOD_RGB888;
break;
case DRM_FORMAT_RGB565:
ctrl1 |= TVE200_IPDMOD_RGB565;
break;
case DRM_FORMAT_XRGB1555:
ctrl1 |= TVE200_IPDMOD_RGB555;
break;
case DRM_FORMAT_XBGR8888:
ctrl1 |= TVE200_IPDMOD_RGB888 | TVE200_BGR;
break;
case DRM_FORMAT_BGR565:
ctrl1 |= TVE200_IPDMOD_RGB565 | TVE200_BGR;
break;
case DRM_FORMAT_XBGR1555:
ctrl1 |= TVE200_IPDMOD_RGB555 | TVE200_BGR;
break;
case DRM_FORMAT_YUYV:
ctrl1 |= TVE200_IPDMOD_YUV422;
ctrl1 |= TVE200_CTRL_YCBCRODR_CR0Y1CB0Y0;
break;
case DRM_FORMAT_YVYU:
ctrl1 |= TVE200_IPDMOD_YUV422;
ctrl1 |= TVE200_CTRL_YCBCRODR_CB0Y1CR0Y0;
break;
case DRM_FORMAT_UYVY:
ctrl1 |= TVE200_IPDMOD_YUV422;
ctrl1 |= TVE200_CTRL_YCBCRODR_Y1CR0Y0CB0;
break;
case DRM_FORMAT_VYUY:
ctrl1 |= TVE200_IPDMOD_YUV422;
ctrl1 |= TVE200_CTRL_YCBCRODR_Y1CB0Y0CR0;
break;
case DRM_FORMAT_YUV420:
ctrl1 |= TVE200_CTRL_YUV420;
ctrl1 |= TVE200_IPDMOD_YUV420;
break;
default:
dev_err(drm->dev, "Unknown FB format 0x%08x\n",
fb->format->format);
break;
}
ctrl1 |= TVE200_TVEEN;
/* Turn it on */
writel(ctrl1, priv->regs + TVE200_CTRL);
drm_crtc_vblank_on(crtc);
}
static void tve200_display_disable(struct drm_simple_display_pipe *pipe)
{
struct drm_crtc *crtc = &pipe->crtc;
struct drm_device *drm = crtc->dev;
struct tve200_drm_dev_private *priv = drm->dev_private;
drm_crtc_vblank_off(crtc);
/* Disable and Power Down */
writel(0, priv->regs + TVE200_CTRL);
clk_disable_unprepare(priv->clk);
}
static void tve200_display_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_pstate)
{
struct drm_crtc *crtc = &pipe->crtc;
struct drm_device *drm = crtc->dev;
struct tve200_drm_dev_private *priv = drm->dev_private;
struct drm_pending_vblank_event *event = crtc->state->event;
struct drm_plane *plane = &pipe->plane;
struct drm_plane_state *pstate = plane->state;
struct drm_framebuffer *fb = pstate->fb;
if (fb) {
/* For RGB, the Y component is used as base address */
writel(drm_fb_cma_get_gem_addr(fb, pstate, 0),
priv->regs + TVE200_Y_FRAME_BASE_ADDR);
/* For three plane YUV we need two more addresses */
if (fb->format->format == DRM_FORMAT_YUV420) {
writel(drm_fb_cma_get_gem_addr(fb, pstate, 1),
priv->regs + TVE200_U_FRAME_BASE_ADDR);
writel(drm_fb_cma_get_gem_addr(fb, pstate, 2),
priv->regs + TVE200_V_FRAME_BASE_ADDR);
}
}
if (event) {
crtc->state->event = NULL;
spin_lock_irq(&crtc->dev->event_lock);
if (crtc->state->active && drm_crtc_vblank_get(crtc) == 0)
drm_crtc_arm_vblank_event(crtc, event);
else
drm_crtc_send_vblank_event(crtc, event);
spin_unlock_irq(&crtc->dev->event_lock);
}
}
static int tve200_display_enable_vblank(struct drm_simple_display_pipe *pipe)
{
struct drm_crtc *crtc = &pipe->crtc;
struct drm_device *drm = crtc->dev;
struct tve200_drm_dev_private *priv = drm->dev_private;
writel(TVE200_INT_V_STATUS, priv->regs + TVE200_INT_EN);
return 0;
}
static void tve200_display_disable_vblank(struct drm_simple_display_pipe *pipe)
{
struct drm_crtc *crtc = &pipe->crtc;
struct drm_device *drm = crtc->dev;
struct tve200_drm_dev_private *priv = drm->dev_private;
writel(0, priv->regs + TVE200_INT_EN);
}
static const struct drm_simple_display_pipe_funcs tve200_display_funcs = {
.check = tve200_display_check,
.enable = tve200_display_enable,
.disable = tve200_display_disable,
.update = tve200_display_update,
.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
.enable_vblank = tve200_display_enable_vblank,
.disable_vblank = tve200_display_disable_vblank,
};
int tve200_display_init(struct drm_device *drm)
{
struct tve200_drm_dev_private *priv = drm->dev_private;
int ret;
static const u32 formats[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_XBGR8888,
DRM_FORMAT_RGB565,
DRM_FORMAT_BGR565,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_XBGR1555,
/*
* The controller actually supports any YCbCr ordering,
* for packed YCbCr. This just lists the orderings that
* DRM supports.
*/
DRM_FORMAT_YUYV,
DRM_FORMAT_YVYU,
DRM_FORMAT_UYVY,
DRM_FORMAT_VYUY,
/* This uses three planes */
DRM_FORMAT_YUV420,
};
ret = drm_simple_display_pipe_init(drm, &priv->pipe,
&tve200_display_funcs,
formats, ARRAY_SIZE(formats),
NULL,
priv->connector);
if (ret)
return ret;
return 0;
}
