blob: 82229d7f7cc8fb7135f11688c95f07743ed15f35 [file] [log] [blame]
/*
* Display driver for Allwinner SoCs.
*
* (C) Copyright 2013-2014 Luc Verhaegen <libv@skynet.be>
* (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/display.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <linux/fb.h>
#include <video_fb.h>
DECLARE_GLOBAL_DATA_PTR;
struct sunxi_display {
GraphicDevice graphic_device;
bool enabled;
} sunxi_display;
static int sunxi_hdmi_hpd_detect(void)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
struct sunxi_hdmi_reg * const hdmi =
(struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
/* Set pll3 to 300MHz */
clock_set_pll3(300000000);
/* Set hdmi parent to pll3 */
clrsetbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_PLL_MASK,
CCM_HDMI_CTRL_PLL3);
/* Set ahb gating to pass */
setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_HDMI);
/* Clock on */
setbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_GATE);
writel(SUNXI_HDMI_CTRL_ENABLE, &hdmi->ctrl);
writel(SUNXI_HDMI_PAD_CTRL0_HDP, &hdmi->pad_ctrl0);
udelay(1000);
if (readl(&hdmi->hpd) & SUNXI_HDMI_HPD_DETECT)
return 1;
/* No need to keep these running */
clrbits_le32(&hdmi->ctrl, SUNXI_HDMI_CTRL_ENABLE);
clrbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_GATE);
clrbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_HDMI);
clock_set_pll3(0);
return 0;
}
/*
* This is the entity that mixes and matches the different layers and inputs.
* Allwinner calls it the back-end, but i like composer better.
*/
static void sunxi_composer_init(void)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
struct sunxi_de_be_reg * const de_be =
(struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
int i;
/* Clocks on */
setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_DE_BE0);
setbits_le32(&ccm->dram_clk_gate, 1 << CCM_DRAM_GATE_OFFSET_DE_BE0);
clock_set_de_mod_clock(&ccm->be0_clk_cfg, 300000000);
/* Engine bug, clear registers after reset */
for (i = 0x0800; i < 0x1000; i += 4)
writel(0, SUNXI_DE_BE0_BASE + i);
setbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_ENABLE);
}
static void sunxi_composer_mode_set(struct fb_videomode *mode,
unsigned int address)
{
struct sunxi_de_be_reg * const de_be =
(struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
writel(SUNXI_DE_BE_HEIGHT(mode->yres) | SUNXI_DE_BE_WIDTH(mode->xres),
&de_be->disp_size);
writel(SUNXI_DE_BE_HEIGHT(mode->yres) | SUNXI_DE_BE_WIDTH(mode->xres),
&de_be->layer0_size);
writel(SUNXI_DE_BE_LAYER_STRIDE(mode->xres), &de_be->layer0_stride);
writel(address << 3, &de_be->layer0_addr_low32b);
writel(address >> 29, &de_be->layer0_addr_high4b);
writel(SUNXI_DE_BE_LAYER_ATTR1_FMT_XRGB8888, &de_be->layer0_attr1_ctrl);
setbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_LAYER0_ENABLE);
}
/*
* LCDC, what allwinner calls a CRTC, so timing controller and serializer.
*/
static void sunxi_lcdc_pll_set(int dotclock, int *clk_div, int *clk_double)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
int value, n, m, diff;
int best_n = 0, best_m = 0, best_diff = 0x0FFFFFFF;
int best_double = 0;
/*
* Find the lowest divider resulting in a matching clock, if there
* is no match, pick the closest lower clock, as monitors tend to
* not sync to higher frequencies.
*/
for (m = 15; m > 0; m--) {
n = (m * dotclock) / 3000;
if ((n >= 9) && (n <= 127)) {
value = (3000 * n) / m;
diff = dotclock - value;
if (diff < best_diff) {
best_diff = diff;
best_m = m;
best_n = n;
best_double = 0;
}
}
/* These are just duplicates */
if (!(m & 1))
continue;
n = (m * dotclock) / 6000;
if ((n >= 9) && (n <= 127)) {
value = (6000 * n) / m;
diff = dotclock - value;
if (diff < best_diff) {
best_diff = diff;
best_m = m;
best_n = n;
best_double = 1;
}
}
}
debug("dotclock: %dkHz = %dkHz: (%d * 3MHz * %d) / %d\n",
dotclock, (best_double + 1) * 3000 * best_n / best_m,
best_double + 1, best_n, best_m);
clock_set_pll3(best_n * 3000000);
writel(CCM_LCD_CH1_CTRL_GATE |
(best_double ? CCM_LCD_CH1_CTRL_PLL3_2X : CCM_LCD_CH1_CTRL_PLL3) |
CCM_LCD_CH1_CTRL_M(best_m), &ccm->lcd0_ch1_clk_cfg);
*clk_div = best_m;
*clk_double = best_double;
}
static void sunxi_lcdc_init(void)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
struct sunxi_lcdc_reg * const lcdc =
(struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
/* Reset off */
setbits_le32(&ccm->lcd0_ch0_clk_cfg, CCM_LCD_CH0_CTRL_RST);
/* Clock on */
setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_LCD0);
/* Init lcdc */
writel(0, &lcdc->ctrl); /* Disable tcon */
writel(0, &lcdc->int0); /* Disable all interrupts */
/* Disable tcon0 dot clock */
clrbits_le32(&lcdc->tcon0_dclk, SUNXI_LCDC_TCON0_DCLK_ENABLE);
/* Set all io lines to tristate */
writel(0xffffffff, &lcdc->tcon0_io_tristate);
writel(0xffffffff, &lcdc->tcon1_io_tristate);
}
static void sunxi_lcdc_mode_set(struct fb_videomode *mode,
int *clk_div, int *clk_double)
{
struct sunxi_lcdc_reg * const lcdc =
(struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
int bp, total;
/* Use tcon1 */
clrsetbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_IO_MAP_MASK,
SUNXI_LCDC_CTRL_IO_MAP_TCON1);
/* Enabled, 0x1e start delay */
writel(SUNXI_LCDC_TCON1_CTRL_ENABLE |
SUNXI_LCDC_TCON1_CTRL_CLK_DELAY(0x1e), &lcdc->tcon1_ctrl);
writel(SUNXI_LCDC_X(mode->xres) | SUNXI_LCDC_Y(mode->yres),
&lcdc->tcon1_timing_source);
writel(SUNXI_LCDC_X(mode->xres) | SUNXI_LCDC_Y(mode->yres),
&lcdc->tcon1_timing_scale);
writel(SUNXI_LCDC_X(mode->xres) | SUNXI_LCDC_Y(mode->yres),
&lcdc->tcon1_timing_out);
bp = mode->hsync_len + mode->left_margin;
total = mode->xres + mode->right_margin + bp;
writel(SUNXI_LCDC_TCON1_TIMING_H_TOTAL(total) |
SUNXI_LCDC_TCON1_TIMING_H_BP(bp), &lcdc->tcon1_timing_h);
bp = mode->vsync_len + mode->upper_margin;
total = mode->yres + mode->lower_margin + bp;
writel(SUNXI_LCDC_TCON1_TIMING_V_TOTAL(total) |
SUNXI_LCDC_TCON1_TIMING_V_BP(bp), &lcdc->tcon1_timing_v);
writel(SUNXI_LCDC_X(mode->hsync_len) | SUNXI_LCDC_Y(mode->vsync_len),
&lcdc->tcon1_timing_sync);
sunxi_lcdc_pll_set(mode->pixclock, clk_div, clk_double);
}
static void sunxi_hdmi_mode_set(struct fb_videomode *mode,
int clk_div, int clk_double)
{
struct sunxi_hdmi_reg * const hdmi =
(struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
int x, y;
/* Write clear interrupt status bits */
writel(SUNXI_HDMI_IRQ_STATUS_BITS, &hdmi->irq);
/* Init various registers, select pll3 as clock source */
writel(SUNXI_HDMI_VIDEO_POL_TX_CLK, &hdmi->video_polarity);
writel(SUNXI_HDMI_PAD_CTRL0_RUN, &hdmi->pad_ctrl0);
writel(SUNXI_HDMI_PAD_CTRL1, &hdmi->pad_ctrl1);
writel(SUNXI_HDMI_PLL_CTRL, &hdmi->pll_ctrl);
writel(SUNXI_HDMI_PLL_DBG0_PLL3, &hdmi->pll_dbg0);
/* Setup clk div and doubler */
clrsetbits_le32(&hdmi->pll_ctrl, SUNXI_HDMI_PLL_CTRL_DIV_MASK,
SUNXI_HDMI_PLL_CTRL_DIV(clk_div));
if (!clk_double)
setbits_le32(&hdmi->pad_ctrl1, SUNXI_HDMI_PAD_CTRL1_HALVE);
/* Setup timing registers */
writel(SUNXI_HDMI_Y(mode->yres) | SUNXI_HDMI_X(mode->xres),
&hdmi->video_size);
x = mode->hsync_len + mode->left_margin;
y = mode->vsync_len + mode->upper_margin;
writel(SUNXI_HDMI_Y(y) | SUNXI_HDMI_X(x), &hdmi->video_bp);
x = mode->right_margin;
y = mode->lower_margin;
writel(SUNXI_HDMI_Y(y) | SUNXI_HDMI_X(x), &hdmi->video_fp);
x = mode->hsync_len;
y = mode->vsync_len;
writel(SUNXI_HDMI_Y(y) | SUNXI_HDMI_X(x), &hdmi->video_spw);
if (mode->sync & FB_SYNC_HOR_HIGH_ACT)
setbits_le32(&hdmi->video_polarity, SUNXI_HDMI_VIDEO_POL_HOR);
if (mode->sync & FB_SYNC_VERT_HIGH_ACT)
setbits_le32(&hdmi->video_polarity, SUNXI_HDMI_VIDEO_POL_VER);
}
static void sunxi_engines_init(void)
{
sunxi_composer_init();
sunxi_lcdc_init();
}
static void sunxi_mode_set(struct fb_videomode *mode, unsigned int address)
{
struct sunxi_de_be_reg * const de_be =
(struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
struct sunxi_lcdc_reg * const lcdc =
(struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
struct sunxi_hdmi_reg * const hdmi =
(struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
int clk_div, clk_double;
int retries = 3;
retry:
clrbits_le32(&hdmi->video_ctrl, SUNXI_HDMI_VIDEO_CTRL_ENABLE);
clrbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_TCON_ENABLE);
clrbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_START);
sunxi_composer_mode_set(mode, address);
sunxi_lcdc_mode_set(mode, &clk_div, &clk_double);
sunxi_hdmi_mode_set(mode, clk_div, clk_double);
setbits_le32(&de_be->reg_ctrl, SUNXI_DE_BE_REG_CTRL_LOAD_REGS);
setbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_START);
udelay(1000000 / mode->refresh + 500);
setbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_TCON_ENABLE);
udelay(1000000 / mode->refresh + 500);
setbits_le32(&hdmi->video_ctrl, SUNXI_HDMI_VIDEO_CTRL_ENABLE);
udelay(1000000 / mode->refresh + 500);
/*
* Sometimes the display pipeline does not sync up properly, if
* this happens the hdmi fifo underrun or overrun bits are set.
*/
if (readl(&hdmi->irq) &
(SUNXI_HDMI_IRQ_STATUS_FIFO_UF | SUNXI_HDMI_IRQ_STATUS_FIFO_OF)) {
if (retries--)
goto retry;
printf("HDMI fifo under or overrun\n");
}
}
void *video_hw_init(void)
{
static GraphicDevice *graphic_device = &sunxi_display.graphic_device;
/*
* Vesa standard 1024x768@60
* 65.0 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
*/
struct fb_videomode mode = {
.name = "1024x768",
.refresh = 60,
.xres = 1024,
.yres = 768,
.pixclock = 65000,
.left_margin = 160,
.right_margin = 24,
.upper_margin = 29,
.lower_margin = 3,
.hsync_len = 136,
.vsync_len = 6,
.sync = 0,
.vmode = 0,
.flag = 0,
};
int ret;
memset(&sunxi_display, 0, sizeof(struct sunxi_display));
printf("Reserved %dkB of RAM for Framebuffer.\n",
CONFIG_SUNXI_FB_SIZE >> 10);
gd->fb_base = gd->ram_top;
ret = sunxi_hdmi_hpd_detect();
if (!ret)
return NULL;
printf("HDMI connected.\n");
sunxi_display.enabled = true;
printf("Setting up a %s console.\n", mode.name);
sunxi_engines_init();
sunxi_mode_set(&mode, gd->fb_base - CONFIG_SYS_SDRAM_BASE);
/*
* These are the only members of this structure that are used. All the
* others are driver specific. There is nothing to decribe pitch or
* stride, but we are lucky with our hw.
*/
graphic_device->frameAdrs = gd->fb_base;
graphic_device->gdfIndex = GDF_32BIT_X888RGB;
graphic_device->gdfBytesPP = 4;
graphic_device->winSizeX = mode.xres;
graphic_device->winSizeY = mode.yres;
return graphic_device;
}