mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-18 09:13:06 +00:00
21a151a79d
The U-Boot port for ST-Ericsson Ux500 is currently only used on the "stemmy" board, where U-Boot runs after firmware that already sets up a boot splash screen. This means that the display is already on and we can just continue using it for U-Boot. Add a simple driver that simplifies this by reading the display configuration (e.g. screen size, bpp) from the hardware registers. It also checks the configured "source synchronization" - for some displays (usually DSI command mode displays) we need to explicitly trigger a software sync. This is done through the video_sync() callback that triggers the sync and wait for completion. Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/* Copyright (C) 2019 Stephan Gerhold */
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <log.h>
|
|
#include <video.h>
|
|
#include <asm/io.h>
|
|
#include <linux/bitfield.h>
|
|
#include <linux/iopoll.h>
|
|
|
|
#define MCDE_EXTSRC0A0 0x200
|
|
#define MCDE_EXTSRC0CONF 0x20C
|
|
#define MCDE_EXTSRC0CONF_BPP GENMASK(11, 8)
|
|
#define MCDE_OVL0CONF 0x404
|
|
#define MCDE_OVL0CONF_PPL GENMASK(10, 0)
|
|
#define MCDE_OVL0CONF_LPF GENMASK(26, 16)
|
|
#define MCDE_CHNL0SYNCHMOD 0x608
|
|
#define MCDE_CHNL0SYNCHMOD_SRC_SYNCH GENMASK(1, 0)
|
|
#define MCDE_CHNL0SYNCHSW 0x60C
|
|
#define MCDE_CHNL0SYNCHSW_SW_TRIG BIT(0)
|
|
#define MCDE_CRA0 0x800
|
|
#define MCDE_CRA0_FLOEN BIT(0)
|
|
|
|
#define MCDE_FLOW_COMPLETION_TIMEOUT 200000 /* us */
|
|
|
|
enum mcde_bpp {
|
|
MCDE_EXTSRC0CONF_BPP_1BPP_PAL,
|
|
MCDE_EXTSRC0CONF_BPP_2BPP_PAL,
|
|
MCDE_EXTSRC0CONF_BPP_4BPP_PAL,
|
|
MCDE_EXTSRC0CONF_BPP_8BPP_PAL,
|
|
MCDE_EXTSRC0CONF_BPP_RGB444,
|
|
MCDE_EXTSRC0CONF_BPP_ARGB4444,
|
|
MCDE_EXTSRC0CONF_BPP_IRGB1555,
|
|
MCDE_EXTSRC0CONF_BPP_RGB565,
|
|
MCDE_EXTSRC0CONF_BPP_RGB888,
|
|
MCDE_EXTSRC0CONF_BPP_XRGB8888,
|
|
MCDE_EXTSRC0CONF_BPP_ARGB8888,
|
|
MCDE_EXTSRC0CONF_BPP_YCBCR422,
|
|
};
|
|
|
|
enum mcde_src_synch {
|
|
MCDE_CHNL0SYNCHMOD_SRC_SYNCH_HARDWARE,
|
|
MCDE_CHNL0SYNCHMOD_SRC_SYNCH_NO_SYNCH,
|
|
MCDE_CHNL0SYNCHMOD_SRC_SYNCH_SOFTWARE,
|
|
};
|
|
|
|
struct mcde_simple_priv {
|
|
fdt_addr_t base;
|
|
enum mcde_src_synch src_synch;
|
|
};
|
|
|
|
static int mcde_simple_probe(struct udevice *dev)
|
|
{
|
|
struct mcde_simple_priv *priv = dev_get_priv(dev);
|
|
struct video_uc_plat *plat = dev_get_uclass_plat(dev);
|
|
struct video_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
u32 val;
|
|
|
|
priv->base = dev_read_addr(dev);
|
|
if (priv->base == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
plat->base = readl(priv->base + MCDE_EXTSRC0A0);
|
|
if (!plat->base)
|
|
return -ENODEV;
|
|
|
|
val = readl(priv->base + MCDE_OVL0CONF);
|
|
uc_priv->xsize = FIELD_GET(MCDE_OVL0CONF_PPL, val);
|
|
uc_priv->ysize = FIELD_GET(MCDE_OVL0CONF_LPF, val);
|
|
uc_priv->rot = 0;
|
|
|
|
val = readl(priv->base + MCDE_EXTSRC0CONF);
|
|
switch (FIELD_GET(MCDE_EXTSRC0CONF_BPP, val)) {
|
|
case MCDE_EXTSRC0CONF_BPP_RGB565:
|
|
uc_priv->bpix = VIDEO_BPP16;
|
|
break;
|
|
case MCDE_EXTSRC0CONF_BPP_XRGB8888:
|
|
case MCDE_EXTSRC0CONF_BPP_ARGB8888:
|
|
uc_priv->bpix = VIDEO_BPP32;
|
|
break;
|
|
default:
|
|
printf("unsupported format: %#x\n", val);
|
|
return -EINVAL;
|
|
}
|
|
|
|
val = readl(priv->base + MCDE_CHNL0SYNCHMOD);
|
|
priv->src_synch = FIELD_GET(MCDE_CHNL0SYNCHMOD_SRC_SYNCH, val);
|
|
|
|
plat->size = uc_priv->xsize * uc_priv->ysize * VNBYTES(uc_priv->bpix);
|
|
debug("MCDE base: %#lx, xsize: %d, ysize: %d, bpp: %d\n",
|
|
plat->base, uc_priv->xsize, uc_priv->ysize, VNBITS(uc_priv->bpix));
|
|
|
|
video_set_flush_dcache(dev, true);
|
|
return 0;
|
|
}
|
|
|
|
static int mcde_simple_video_sync(struct udevice *dev)
|
|
{
|
|
struct mcde_simple_priv *priv = dev_get_priv(dev);
|
|
unsigned int val;
|
|
|
|
if (priv->src_synch != MCDE_CHNL0SYNCHMOD_SRC_SYNCH_SOFTWARE)
|
|
return 0;
|
|
|
|
/* Enable flow */
|
|
val = readl(priv->base + MCDE_CRA0);
|
|
val |= MCDE_CRA0_FLOEN;
|
|
writel(val, priv->base + MCDE_CRA0);
|
|
|
|
/* Trigger a software sync */
|
|
writel(MCDE_CHNL0SYNCHSW_SW_TRIG, priv->base + MCDE_CHNL0SYNCHSW);
|
|
|
|
/* Disable flow */
|
|
val = readl(priv->base + MCDE_CRA0);
|
|
val &= ~MCDE_CRA0_FLOEN;
|
|
writel(val, priv->base + MCDE_CRA0);
|
|
|
|
/* Wait for completion */
|
|
return readl_poll_timeout(priv->base + MCDE_CRA0, val,
|
|
!(val & MCDE_CRA0_FLOEN),
|
|
MCDE_FLOW_COMPLETION_TIMEOUT);
|
|
}
|
|
|
|
static struct video_ops mcde_simple_ops = {
|
|
.video_sync = mcde_simple_video_sync,
|
|
};
|
|
|
|
static const struct udevice_id mcde_simple_ids[] = {
|
|
{ .compatible = "ste,mcde" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(mcde_simple) = {
|
|
.name = "mcde_simple",
|
|
.id = UCLASS_VIDEO,
|
|
.ops = &mcde_simple_ops,
|
|
.of_match = mcde_simple_ids,
|
|
.probe = mcde_simple_probe,
|
|
.priv_auto = sizeof(struct mcde_simple_priv),
|
|
};
|