// SPDX-License-Identifier: GPL-2.0+
// Copyright 2018 IBM Corporation
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/regmap.h>
#include <drm/drm_device.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_panel.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_vblank.h>
#include "aspeed_gfx.h"
static struct aspeed_gfx *
drm_pipe_to_aspeed_gfx(struct drm_simple_display_pipe *pipe)
{
return container_of(pipe, struct aspeed_gfx, pipe);
}
static int aspeed_gfx_set_pixel_fmt(struct aspeed_gfx *priv, u32 *bpp)
{
struct drm_crtc *crtc = &priv->pipe.crtc;
struct drm_device *drm = crtc->dev;
const u32 format = crtc->primary->state->fb->format->format;
u32 ctrl1;
ctrl1 = readl(priv->base + CRT_CTRL1);
ctrl1 &= ~CRT_CTRL_COLOR_MASK;
switch (format) {
case DRM_FORMAT_RGB565:
dev_dbg(drm->dev, "Setting up RGB565 mode\n");
ctrl1 |= CRT_CTRL_COLOR_RGB565;
*bpp = 16;
break;
case DRM_FORMAT_XRGB8888:
dev_dbg(drm->dev, "Setting up XRGB8888 mode\n");
ctrl1 |= CRT_CTRL_COLOR_XRGB8888;
*bpp = 32;
break;
default:
dev_err(drm->dev, "Unhandled pixel format %08x\n", format);
return -EINVAL;
}
writel(ctrl1, priv->base + CRT_CTRL1);
return 0;
}
static void aspeed_gfx_enable_controller(struct aspeed_gfx *priv)
{
u32 ctrl1 = readl(priv->base + CRT_CTRL1);
u32 ctrl2 = readl(priv->base + CRT_CTRL2);
/* Set DAC source for display output to Graphics CRT (GFX) */
regmap_update_bits(priv->scu, priv->dac_reg, BIT(16), BIT(16));
writel(ctrl1 | CRT_CTRL_EN, priv->base + CRT_CTRL1);
writel(ctrl2 | CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2);
}
static void aspeed_gfx_disable_controller(struct aspeed_gfx *priv)
{
u32 ctrl1 = readl(priv->base + CRT_CTRL1);
u32 ctrl2 = readl(priv->base + CRT_CTRL2);
writel(ctrl1 & ~CRT_CTRL_EN, priv->base + CRT_CTRL1);
writel(ctrl2 & ~CRT_CTRL_DAC_EN, priv->base + CRT_CTRL2);
regmap_update_bits(priv->scu, priv->dac_reg, BIT(16), 0);
}
static void aspeed_gfx_crtc_mode_set_nofb(struct aspeed_gfx *priv)
{
struct drm_display_mode *m = &priv->pipe.crtc.state->adjusted_mode;
u32 ctrl1, d_offset, t_count, bpp;
int err;
err = aspeed_gfx_set_pixel_fmt(priv, &bpp);
if (err)
return;
#if 0
/* TODO: we have only been able to test with the 40MHz USB clock. The
* clock is fixed, so we cannot adjust it here. */
clk_set_rate(priv->pixel_clk, m->crtc_clock * 1000);
#endif
ctrl1 = readl(priv->base + CRT_CTRL1);
ctrl1 &= ~(CRT_CTRL_INTERLACED |
CRT_CTRL_HSYNC_NEGATIVE |
CRT_CTRL_VSYNC_NEGATIVE);
if (m->flags & DRM_MODE_FLAG_INTERLACE)
ctrl1 |= CRT_CTRL_INTERLACED;
if (!(m->flags & DRM_MODE_FLAG_PHSYNC))
ctrl1 |= CRT_CTRL_HSYNC_NEGATIVE;
if (!(m->flags & DRM_MODE_FLAG_PVSYNC))
ctrl1 |= CRT_CTRL_VSYNC_NEGATIVE;
writel(ctrl1, priv->base + CRT_CTRL1);
/* Horizontal timing */
writel(CRT_H_TOTAL(m->htotal - 1) | CRT_H_DE(m->hdisplay - 1),
priv->base + CRT_HORIZ0);
writel(CRT_H_RS_START(m->hsync_start - 1) | CRT_H_RS_END(m->hsync_end),
priv->base + CRT_HORIZ1);
/* Vertical timing */
writel(CRT_V_TOTAL(m->vtotal - 1) | CRT_V_DE(m->vdisplay - 1),
priv->base + CRT_VERT0);
writel(CRT_V_RS_START(m->vsync_start) | CRT_V_RS_END(m->vsync_end),
priv->base + CRT_VERT1);
/*
* Display Offset: address difference between consecutive scan lines
* Terminal Count: memory size of one scan line
*/
d_offset = m->hdisplay * bpp / 8;
t_count = DIV_ROUND_UP(m->hdisplay * bpp, priv->scan_line_max);
writel(CRT_DISP_OFFSET(d_offset) | CRT_TERM_COUNT(t_count),
priv->base + CRT_OFFSET);
/*
* Threshold: FIFO thresholds of refill and stop (16 byte chunks
* per line, rounded up)
*/
writel(priv->throd_val, priv->base + CRT_THROD);
}
static void aspeed_gfx_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
struct drm_crtc *crtc = &pipe->crtc;
aspeed_gfx_crtc_mode_set_nofb(priv);
aspeed_gfx_enable_controller(priv);
drm_crtc_vblank_on(crtc);
}
static void aspeed_gfx_pipe_disable(struct drm_simple_display_pipe *pipe)
{
struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
struct drm_crtc *crtc = &pipe->crtc;
drm_crtc_vblank_off(crtc);
aspeed_gfx_disable_controller(priv);
}
static void aspeed_gfx_pipe_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state)
{
struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
struct drm_crtc *crtc = &pipe->crtc;
struct drm_framebuffer *fb = pipe->plane.state->fb;
struct drm_pending_vblank_event *event;
struct drm_gem_dma_object *gem;
spin_lock_irq(&crtc->dev->event_lock);
event = crtc->state->event;
if (event) {
crtc->state->event = NULL;
if (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);
if (!fb)
return;
gem = drm_fb_dma_get_gem_obj(fb, 0);
if (!gem)
return;
writel(gem->dma_addr, priv->base + CRT_ADDR);
}
static int aspeed_gfx_enable_vblank(struct drm_simple_display_pipe *pipe)
{
struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
u32 reg = readl(priv->base + CRT_CTRL1);
/* Clear pending VBLANK IRQ */
writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1);
reg |= CRT_CTRL_VERTICAL_INTR_EN;
writel(reg, priv->base + CRT_CTRL1);
return 0;
}
static void aspeed_gfx_disable_vblank(struct drm_simple_display_pipe *pipe)
{
struct aspeed_gfx *priv = drm_pipe_to_aspeed_gfx(pipe);
u32 reg = readl(priv->base + CRT_CTRL1);
reg &= ~CRT_CTRL_VERTICAL_INTR_EN;
writel(reg, priv->base + CRT_CTRL1);
/* Clear pending VBLANK IRQ */
writel(reg | CRT_CTRL_VERTICAL_INTR_STS, priv->base + CRT_CTRL1);
}
static const struct drm_simple_display_pipe_funcs aspeed_gfx_funcs = {
.enable = aspeed_gfx_pipe_enable,
.disable = aspeed_gfx_pipe_disable,
.update = aspeed_gfx_pipe_update,
.enable_vblank = aspeed_gfx_enable_vblank,
.disable_vblank = aspeed_gfx_disable_vblank,
};
static const uint32_t aspeed_gfx_formats[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_RGB565,
};
int aspeed_gfx_create_pipe(struct drm_device *drm)
{
struct aspeed_gfx *priv = to_aspeed_gfx(drm);
return drm_simple_display_pipe_init(drm, &priv->pipe, &aspeed_gfx_funcs,
aspeed_gfx_formats,
ARRAY_SIZE(aspeed_gfx_formats),
NULL,
&priv->connector);
}
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