// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Free Electrons
* Maxime Ripard <maxime.ripard@free-electrons.com>
*/
#include <drm/drmP.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include "sun4i_drv.h"
#include "sun4i_frontend.h"
static const u32 sun4i_frontend_vert_coef[32] = {
0x00004000, 0x000140ff, 0x00033ffe, 0x00043ffd,
0x00063efc, 0xff083dfc, 0x000a3bfb, 0xff0d39fb,
0xff0f37fb, 0xff1136fa, 0xfe1433fb, 0xfe1631fb,
0xfd192ffb, 0xfd1c2cfb, 0xfd1f29fb, 0xfc2127fc,
0xfc2424fc, 0xfc2721fc, 0xfb291ffd, 0xfb2c1cfd,
0xfb2f19fd, 0xfb3116fe, 0xfb3314fe, 0xfa3611ff,
0xfb370fff, 0xfb390dff, 0xfb3b0a00, 0xfc3d08ff,
0xfc3e0600, 0xfd3f0400, 0xfe3f0300, 0xff400100,
};
static const u32 sun4i_frontend_horz_coef[64] = {
0x40000000, 0x00000000, 0x40fe0000, 0x0000ff03,
0x3ffd0000, 0x0000ff05, 0x3ffc0000, 0x0000ff06,
0x3efb0000, 0x0000ff08, 0x3dfb0000, 0x0000ff09,
0x3bfa0000, 0x0000fe0d, 0x39fa0000, 0x0000fe0f,
0x38fa0000, 0x0000fe10, 0x36fa0000, 0x0000fe12,
0x33fa0000, 0x0000fd16, 0x31fa0000, 0x0000fd18,
0x2ffa0000, 0x0000fd1a, 0x2cfa0000, 0x0000fc1e,
0x29fa0000, 0x0000fc21, 0x27fb0000, 0x0000fb23,
0x24fb0000, 0x0000fb26, 0x21fb0000, 0x0000fb29,
0x1ffc0000, 0x0000fa2b, 0x1cfc0000, 0x0000fa2e,
0x19fd0000, 0x0000fa30, 0x16fd0000, 0x0000fa33,
0x14fd0000, 0x0000fa35, 0x11fe0000, 0x0000fa37,
0x0ffe0000, 0x0000fa39, 0x0dfe0000, 0x0000fa3b,
0x0afe0000, 0x0000fa3e, 0x08ff0000, 0x0000fb3e,
0x06ff0000, 0x0000fb40, 0x05ff0000, 0x0000fc40,
0x03ff0000, 0x0000fd41, 0x01ff0000, 0x0000fe42,
};
static void sun4i_frontend_scaler_init(struct sun4i_frontend *frontend)
{
int i;
for (i = 0; i < 32; i++) {
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZCOEF0_REG(i),
sun4i_frontend_horz_coef[2 * i]);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZCOEF0_REG(i),
sun4i_frontend_horz_coef[2 * i]);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZCOEF1_REG(i),
sun4i_frontend_horz_coef[2 * i + 1]);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZCOEF1_REG(i),
sun4i_frontend_horz_coef[2 * i + 1]);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTCOEF_REG(i),
sun4i_frontend_vert_coef[i]);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTCOEF_REG(i),
sun4i_frontend_vert_coef[i]);
}
regmap_update_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL,
SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL);
}
int sun4i_frontend_init(struct sun4i_frontend *frontend)
{
return pm_runtime_get_sync(frontend->dev);
}
EXPORT_SYMBOL(sun4i_frontend_init);
void sun4i_frontend_exit(struct sun4i_frontend *frontend)
{
pm_runtime_put(frontend->dev);
}
EXPORT_SYMBOL(sun4i_frontend_exit);
void sun4i_frontend_update_buffer(struct sun4i_frontend *frontend,
struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
dma_addr_t paddr;
/* Set the line width */
DRM_DEBUG_DRIVER("Frontend stride: %d bytes\n", fb->pitches[0]);
regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD0_REG,
fb->pitches[0]);
/* Set the physical address of the buffer in memory */
paddr = drm_fb_cma_get_gem_addr(fb, state, 0);
paddr -= PHYS_OFFSET;
DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR0_REG, paddr);
}
EXPORT_SYMBOL(sun4i_frontend_update_buffer);
static int sun4i_frontend_drm_format_to_input_fmt(uint32_t fmt, u32 *val)
{
switch (fmt) {
case DRM_FORMAT_XRGB8888:
*val = SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_RGB;
return 0;
default:
return -EINVAL;
}
}
static int sun4i_frontend_drm_format_to_input_mode(uint32_t fmt, u32 *val)
{
if (drm_format_num_planes(fmt) == 1)
*val = SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PACKED;
else
return -EINVAL;
return 0;
}
static int sun4i_frontend_drm_format_to_input_sequence(uint32_t fmt, u32 *val)
{
switch (fmt) {
case DRM_FORMAT_BGRX8888:
*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_BGRX;
return 0;
case DRM_FORMAT_XRGB8888:
*val = SUN4I_FRONTEND_INPUT_FMT_DATA_PS_XRGB;
return 0;
default:
return -EINVAL;
}
}
static int sun4i_frontend_drm_format_to_output_fmt(uint32_t fmt, u32 *val)
{
switch (fmt) {
case DRM_FORMAT_BGRX8888:
*val = SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_BGRX8888;
return 0;
case DRM_FORMAT_XRGB8888:
*val = SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_XRGB8888;
return 0;
default:
return -EINVAL;
}
}
static const uint32_t sun4i_frontend_formats[] = {
DRM_FORMAT_BGRX8888,
DRM_FORMAT_XRGB8888,
};
bool sun4i_frontend_format_is_supported(uint32_t fmt, uint64_t modifier)
{
unsigned int i;
if (modifier != DRM_FORMAT_MOD_LINEAR)
return false;
for (i = 0; i < ARRAY_SIZE(sun4i_frontend_formats); i++)
if (sun4i_frontend_formats[i] == fmt)
return true;
return false;
}
EXPORT_SYMBOL(sun4i_frontend_format_is_supported);
int sun4i_frontend_update_formats(struct sun4i_frontend *frontend,
struct drm_plane *plane, uint32_t out_fmt)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
uint32_t format = fb->format->format;
u32 out_fmt_val;
u32 in_fmt_val, in_mod_val, in_ps_val;
int ret;
ret = sun4i_frontend_drm_format_to_input_fmt(format, &in_fmt_val);
if (ret) {
DRM_DEBUG_DRIVER("Invalid input format\n");
return ret;
}
ret = sun4i_frontend_drm_format_to_input_mode(format, &in_mod_val);
if (ret) {
DRM_DEBUG_DRIVER("Invalid input mode\n");
return ret;
}
ret = sun4i_frontend_drm_format_to_input_sequence(format, &in_ps_val);
if (ret) {
DRM_DEBUG_DRIVER("Invalid pixel sequence\n");
return ret;
}
ret = sun4i_frontend_drm_format_to_output_fmt(out_fmt, &out_fmt_val);
if (ret) {
DRM_DEBUG_DRIVER("Invalid output format\n");
return ret;
}
/*
* I have no idea what this does exactly, but it seems to be
* related to the scaler FIR filter phase parameters.
*/
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZPHASE_REG, 0x400);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZPHASE_REG, 0x400);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTPHASE0_REG, 0x400);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTPHASE0_REG, 0x400);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTPHASE1_REG, 0x400);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTPHASE1_REG, 0x400);
regmap_update_bits(frontend->regs, SUN4I_FRONTEND_BYPASS_REG,
SUN4I_FRONTEND_BYPASS_CSC_EN,
SUN4I_FRONTEND_BYPASS_CSC_EN);
regmap_write(frontend->regs, SUN4I_FRONTEND_INPUT_FMT_REG,
in_mod_val | in_fmt_val | in_ps_val);
/*
* TODO: It look like the A31 and A80 at least will need the
* bit 7 (ALPHA_EN) enabled when using a format with alpha (so
* ARGB8888).
*/
regmap_write(frontend->regs, SUN4I_FRONTEND_OUTPUT_FMT_REG,
out_fmt_val);
return 0;
}
EXPORT_SYMBOL(sun4i_frontend_update_formats);
void sun4i_frontend_update_coord(struct sun4i_frontend *frontend,
struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
uint32_t luma_width, luma_height;
uint32_t chroma_width, chroma_height;
/* Set height and width */
DRM_DEBUG_DRIVER("Frontend size W: %u H: %u\n",
state->crtc_w, state->crtc_h);
luma_width = state->src_w >> 16;
luma_height = state->src_h >> 16;
chroma_width = DIV_ROUND_UP(luma_width, fb->format->hsub);
chroma_height = DIV_ROUND_UP(luma_height, fb->format->vsub);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_INSIZE_REG,
SUN4I_FRONTEND_INSIZE(luma_height, luma_width));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_INSIZE_REG,
SUN4I_FRONTEND_INSIZE(chroma_height, chroma_width));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_OUTSIZE_REG,
SUN4I_FRONTEND_OUTSIZE(state->crtc_h, state->crtc_w));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_OUTSIZE_REG,
SUN4I_FRONTEND_OUTSIZE(state->crtc_h, state->crtc_w));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZFACT_REG,
(luma_width << 16) / state->crtc_w);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZFACT_REG,
(chroma_width << 16) / state->crtc_w);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTFACT_REG,
(luma_height << 16) / state->crtc_h);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTFACT_REG,
(chroma_height << 16) / state->crtc_h);
regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
SUN4I_FRONTEND_FRM_CTRL_REG_RDY,
SUN4I_FRONTEND_FRM_CTRL_REG_RDY);
}
EXPORT_SYMBOL(sun4i_frontend_update_coord);
int sun4i_frontend_enable(struct sun4i_frontend *frontend)
{
regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
SUN4I_FRONTEND_FRM_CTRL_FRM_START,
SUN4I_FRONTEND_FRM_CTRL_FRM_START);
return 0;
}
EXPORT_SYMBOL(sun4i_frontend_enable);
static struct regmap_config sun4i_frontend_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x0a14,
};
static int sun4i_frontend_bind(struct device *dev, struct device *master,
void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct sun4i_frontend *frontend;
struct drm_device *drm = data;
struct sun4i_drv *drv = drm->dev_private;
struct resource *res;
void __iomem *regs;
frontend = devm_kzalloc(dev, sizeof(*frontend), GFP_KERNEL);
if (!frontend)
return -ENOMEM;
dev_set_drvdata(dev, frontend);
frontend->dev = dev;
frontend->node = dev->of_node;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(dev, res);
if (IS_ERR(regs))
return PTR_ERR(regs);
frontend->regs = devm_regmap_init_mmio(dev, regs,
&sun4i_frontend_regmap_config);
if (IS_ERR(frontend->regs)) {
dev_err(dev, "Couldn't create the frontend regmap\n");
return PTR_ERR(frontend->regs);
}
frontend->reset = devm_reset_control_get(dev, NULL);
if (IS_ERR(frontend->reset)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(frontend->reset);
}
frontend->bus_clk = devm_clk_get(dev, "ahb");
if (IS_ERR(frontend->bus_clk)) {
dev_err(dev, "Couldn't get our bus clock\n");
return PTR_ERR(frontend->bus_clk);
}
frontend->mod_clk = devm_clk_get(dev, "mod");
if (IS_ERR(frontend->mod_clk)) {
dev_err(dev, "Couldn't get our mod clock\n");
return PTR_ERR(frontend->mod_clk);
}
frontend->ram_clk = devm_clk_get(dev, "ram");
if (IS_ERR(frontend->ram_clk)) {
dev_err(dev, "Couldn't get our ram clock\n");
return PTR_ERR(frontend->ram_clk);
}
list_add_tail(&frontend->list, &drv->frontend_list);
pm_runtime_enable(dev);
return 0;
}
static void sun4i_frontend_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun4i_frontend *frontend = dev_get_drvdata(dev);
list_del(&frontend->list);
pm_runtime_force_suspend(dev);
}
static const struct component_ops sun4i_frontend_ops = {
.bind = sun4i_frontend_bind,
.unbind = sun4i_frontend_unbind,
};
static int sun4i_frontend_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &sun4i_frontend_ops);
}
static int sun4i_frontend_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sun4i_frontend_ops);
return 0;
}
static int sun4i_frontend_runtime_resume(struct device *dev)
{
struct sun4i_frontend *frontend = dev_get_drvdata(dev);
int ret;
clk_set_rate(frontend->mod_clk, 300000000);
clk_prepare_enable(frontend->bus_clk);
clk_prepare_enable(frontend->mod_clk);
clk_prepare_enable(frontend->ram_clk);
ret = reset_control_reset(frontend->reset);
if (ret) {
dev_err(dev, "Couldn't reset our device\n");
return ret;
}
regmap_update_bits(frontend->regs, SUN4I_FRONTEND_EN_REG,
SUN4I_FRONTEND_EN_EN,
SUN4I_FRONTEND_EN_EN);
sun4i_frontend_scaler_init(frontend);
return 0;
}
static int sun4i_frontend_runtime_suspend(struct device *dev)
{
struct sun4i_frontend *frontend = dev_get_drvdata(dev);
clk_disable_unprepare(frontend->ram_clk);
clk_disable_unprepare(frontend->mod_clk);
clk_disable_unprepare(frontend->bus_clk);
reset_control_assert(frontend->reset);
return 0;
}
static const struct dev_pm_ops sun4i_frontend_pm_ops = {
.runtime_resume = sun4i_frontend_runtime_resume,
.runtime_suspend = sun4i_frontend_runtime_suspend,
};
const struct of_device_id sun4i_frontend_of_table[] = {
{ .compatible = "allwinner,sun8i-a33-display-frontend" },
{ }
};
EXPORT_SYMBOL(sun4i_frontend_of_table);
MODULE_DEVICE_TABLE(of, sun4i_frontend_of_table);
static struct platform_driver sun4i_frontend_driver = {
.probe = sun4i_frontend_probe,
.remove = sun4i_frontend_remove,
.driver = {
.name = "sun4i-frontend",
.of_match_table = sun4i_frontend_of_table,
.pm = &sun4i_frontend_pm_ops,
},
};
module_platform_driver(sun4i_frontend_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 Display Engine Frontend Driver");
MODULE_LICENSE("GPL");
