u-boot/drivers/video/atmel_lcdfb.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

309 lines
8.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for AT91/AT32 LCD Controller
*
* Copyright (C) 2007 Atmel Corporation
*/
#include <common.h>
#include <atmel_lcd.h>
#include <dm.h>
#include <fdtdec.h>
#include <video.h>
#include <asm/io.h>
#include <asm/arch/gpio.h>
#include <asm/arch/clk.h>
#include <lcd.h>
#include <bmp_layout.h>
#include <atmel_lcdc.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_DM_VIDEO
enum {
/* Maximum LCD size we support */
LCD_MAX_WIDTH = 1366,
LCD_MAX_HEIGHT = 768,
LCD_MAX_LOG2_BPP = VIDEO_BPP16,
};
#endif
struct atmel_fb_priv {
struct display_timing timing;
};
/* configurable parameters */
#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
#define ATMEL_LCDC_DMA_BURST_LEN 8
#ifndef ATMEL_LCDC_GUARD_TIME
#define ATMEL_LCDC_GUARD_TIME 1
#endif
#if defined(CONFIG_AT91SAM9263)
#define ATMEL_LCDC_FIFO_SIZE 2048
#else
#define ATMEL_LCDC_FIFO_SIZE 512
#endif
#define lcdc_readl(mmio, reg) __raw_readl((mmio)+(reg))
#define lcdc_writel(mmio, reg, val) __raw_writel((val), (mmio)+(reg))
#ifndef CONFIG_DM_VIDEO
ushort *configuration_get_cmap(void)
{
return (ushort *)(panel_info.mmio + ATMEL_LCDC_LUT(0));
}
#if defined(CONFIG_BMP_16BPP) && defined(CONFIG_ATMEL_LCD_BGR555)
void fb_put_word(uchar **fb, uchar **from)
{
*(*fb)++ = (((*from)[0] & 0x1f) << 2) | ((*from)[1] & 0x03);
*(*fb)++ = ((*from)[0] & 0xe0) | (((*from)[1] & 0x7c) >> 2);
*from += 2;
}
#endif
#ifdef CONFIG_LCD_LOGO
#include <bmp_logo.h>
void lcd_logo_set_cmap(void)
{
int i;
uint lut_entry;
ushort colreg;
uint *cmap = (uint *)configuration_get_cmap();
for (i = 0; i < BMP_LOGO_COLORS; ++i) {
colreg = bmp_logo_palette[i];
#ifdef CONFIG_ATMEL_LCD_BGR555
lut_entry = ((colreg & 0x000F) << 11) |
((colreg & 0x00F0) << 2) |
((colreg & 0x0F00) >> 7);
#else
lut_entry = ((colreg & 0x000F) << 1) |
((colreg & 0x00F0) << 3) |
((colreg & 0x0F00) << 4);
#endif
*(cmap + BMP_LOGO_OFFSET) = lut_entry;
cmap++;
}
}
#endif
void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
{
#if defined(CONFIG_ATMEL_LCD_BGR555)
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
(red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
#else
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
(blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
#endif
}
void lcd_set_cmap(struct bmp_image *bmp, unsigned colors)
{
int i;
for (i = 0; i < colors; ++i) {
struct bmp_color_table_entry cte = bmp->color_table[i];
lcd_setcolreg(i, cte.red, cte.green, cte.blue);
}
}
#endif
static void atmel_fb_init(ulong addr, struct display_timing *timing, int bpix,
bool tft, bool cont_pol_low, ulong lcdbase)
{
unsigned long value;
void *reg = (void *)addr;
/* Turn off the LCD controller and the DMA controller */
lcdc_writel(reg, ATMEL_LCDC_PWRCON,
ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
/* Wait for the LCDC core to become idle */
while (lcdc_readl(reg, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
udelay(10);
lcdc_writel(reg, ATMEL_LCDC_DMACON, 0);
/* Reset LCDC DMA */
lcdc_writel(reg, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
/* ...set frame size and burst length = 8 words (?) */
value = (timing->hactive.typ * timing->vactive.typ *
(1 << bpix)) / 32;
value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
lcdc_writel(reg, ATMEL_LCDC_DMAFRMCFG, value);
/* Set pixel clock */
value = get_lcdc_clk_rate(0) / timing->pixelclock.typ;
if (get_lcdc_clk_rate(0) % timing->pixelclock.typ)
value++;
value = (value / 2) - 1;
if (!value) {
lcdc_writel(reg, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
} else
lcdc_writel(reg, ATMEL_LCDC_LCDCON1,
value << ATMEL_LCDC_CLKVAL_OFFSET);
/* Initialize control register 2 */
value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
if (tft)
value |= ATMEL_LCDC_DISTYPE_TFT;
if (!(timing->flags & DISPLAY_FLAGS_HSYNC_HIGH))
value |= ATMEL_LCDC_INVLINE_INVERTED;
if (!(timing->flags & DISPLAY_FLAGS_VSYNC_HIGH))
value |= ATMEL_LCDC_INVFRAME_INVERTED;
value |= bpix << 5;
lcdc_writel(reg, ATMEL_LCDC_LCDCON2, value);
/* Vertical timing */
value = (timing->vsync_len.typ - 1) << ATMEL_LCDC_VPW_OFFSET;
value |= timing->vback_porch.typ << ATMEL_LCDC_VBP_OFFSET;
value |= timing->vfront_porch.typ;
/* Magic! (Datasheet says "Bit 31 must be written to 1") */
value |= 1U << 31;
lcdc_writel(reg, ATMEL_LCDC_TIM1, value);
/* Horizontal timing */
value = (timing->hfront_porch.typ - 1) << ATMEL_LCDC_HFP_OFFSET;
value |= (timing->hsync_len.typ - 1) << ATMEL_LCDC_HPW_OFFSET;
value |= (timing->hback_porch.typ - 1);
lcdc_writel(reg, ATMEL_LCDC_TIM2, value);
/* Display size */
value = (timing->hactive.typ - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
value |= timing->vactive.typ - 1;
lcdc_writel(reg, ATMEL_LCDC_LCDFRMCFG, value);
/* FIFO Threshold: Use formula from data sheet */
value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
lcdc_writel(reg, ATMEL_LCDC_FIFO, value);
/* Toggle LCD_MODE every frame */
lcdc_writel(reg, ATMEL_LCDC_MVAL, 0);
/* Disable all interrupts */
lcdc_writel(reg, ATMEL_LCDC_IDR, ~0UL);
/* Set contrast */
value = ATMEL_LCDC_PS_DIV8 |
ATMEL_LCDC_ENA_PWMENABLE;
if (!cont_pol_low)
value |= ATMEL_LCDC_POL_POSITIVE;
lcdc_writel(reg, ATMEL_LCDC_CONTRAST_CTR, value);
lcdc_writel(reg, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
/* Set framebuffer DMA base address and pixel offset */
lcdc_writel(reg, ATMEL_LCDC_DMABADDR1, lcdbase);
lcdc_writel(reg, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
lcdc_writel(reg, ATMEL_LCDC_PWRCON,
(ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
}
#ifndef CONFIG_DM_VIDEO
void lcd_ctrl_init(void *lcdbase)
{
struct display_timing timing;
timing.flags = 0;
if (!(panel_info.vl_sync & ATMEL_LCDC_INVLINE_INVERTED))
timing.flags |= DISPLAY_FLAGS_HSYNC_HIGH;
if (!(panel_info.vl_sync & ATMEL_LCDC_INVFRAME_INVERTED))
timing.flags |= DISPLAY_FLAGS_VSYNC_LOW;
timing.pixelclock.typ = panel_info.vl_clk;
timing.hactive.typ = panel_info.vl_col;
timing.hfront_porch.typ = panel_info.vl_right_margin;
timing.hback_porch.typ = panel_info.vl_left_margin;
timing.hsync_len.typ = panel_info.vl_hsync_len;
timing.vactive.typ = panel_info.vl_row;
timing.vfront_porch.typ = panel_info.vl_clk;
timing.vback_porch.typ = panel_info.vl_clk;
timing.vsync_len.typ = panel_info.vl_clk;
atmel_fb_init(panel_info.mmio, &timing, panel_info.vl_bpix,
panel_info.vl_tft, panel_info.vl_cont_pol_low,
(ulong)lcdbase);
}
ulong calc_fbsize(void)
{
return ((panel_info.vl_col * panel_info.vl_row *
NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
}
#endif
#ifdef CONFIG_DM_VIDEO
static int atmel_fb_lcd_probe(struct udevice *dev)
{
struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
struct video_priv *uc_priv = dev_get_uclass_priv(dev);
struct atmel_fb_priv *priv = dev_get_priv(dev);
struct display_timing *timing = &priv->timing;
/*
* For now some values are hard-coded. We could use the device tree
* bindings in simple-framebuffer.txt to specify the format/bpp and
* some Atmel-specific binding for tft and cont_pol_low.
*/
atmel_fb_init(ATMEL_BASE_LCDC, timing, VIDEO_BPP16, true, false,
uc_plat->base);
uc_priv->xsize = timing->hactive.typ;
uc_priv->ysize = timing->vactive.typ;
uc_priv->bpix = VIDEO_BPP16;
video_set_flush_dcache(dev, true);
debug("LCD frame buffer at %lx, size %x, %dx%d pixels\n", uc_plat->base,
uc_plat->size, uc_priv->xsize, uc_priv->ysize);
return 0;
}
static int atmel_fb_ofdata_to_platdata(struct udevice *dev)
{
struct atmel_lcd_platdata *plat = dev_get_platdata(dev);
struct atmel_fb_priv *priv = dev_get_priv(dev);
struct display_timing *timing = &priv->timing;
const void *blob = gd->fdt_blob;
if (fdtdec_decode_display_timing(blob, dev_of_offset(dev),
plat->timing_index, timing)) {
debug("%s: Failed to decode display timing\n", __func__);
return -EINVAL;
}
return 0;
}
static int atmel_fb_lcd_bind(struct udevice *dev)
{
struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
uc_plat->size = LCD_MAX_WIDTH * LCD_MAX_HEIGHT *
(1 << VIDEO_BPP16) / 8;
debug("%s: Frame buffer size %x\n", __func__, uc_plat->size);
return 0;
}
static const struct udevice_id atmel_fb_lcd_ids[] = {
{ .compatible = "atmel,at91sam9g45-lcdc" },
{ }
};
U_BOOT_DRIVER(atmel_fb) = {
.name = "atmel_fb",
.id = UCLASS_VIDEO,
.of_match = atmel_fb_lcd_ids,
.bind = atmel_fb_lcd_bind,
.ofdata_to_platdata = atmel_fb_ofdata_to_platdata,
.probe = atmel_fb_lcd_probe,
.platdata_auto_alloc_size = sizeof(struct atmel_lcd_platdata),
.priv_auto_alloc_size = sizeof(struct atmel_fb_priv),
};
#endif