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+/*
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+ * Display driver for Allwinner SoCs.
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+ *
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+ * (C) Copyright 2013-2014 Luc Verhaegen <libv@skynet.be>
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+ * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
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+ *
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+ * SPDX-License-Identifier: GPL-2.0+
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+ */
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+
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+#include <common.h>
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+
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+#include <asm/arch/clock.h>
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+#include <asm/arch/display.h>
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+#include <asm/global_data.h>
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+#include <asm/io.h>
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+#include <fdtdec.h>
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+#include <fdt_support.h>
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+#include <linux/fb.h>
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+#include <video_fb.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+struct sunxi_display {
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+ GraphicDevice graphic_device;
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+ bool enabled;
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+} sunxi_display;
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+
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+static int sunxi_hdmi_hpd_detect(void)
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+{
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+ struct sunxi_ccm_reg * const ccm =
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+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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+ struct sunxi_hdmi_reg * const hdmi =
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+ (struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
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+
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+ /* Set pll3 to 300MHz */
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+ clock_set_pll3(300000000);
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+
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+ /* Set hdmi parent to pll3 */
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+ clrsetbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_PLL_MASK,
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+ CCM_HDMI_CTRL_PLL3);
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+
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+ /* Set ahb gating to pass */
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+#ifdef CONFIG_MACH_SUN6I
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+ setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_HDMI);
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+#endif
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+ setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_HDMI);
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+
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+ /* Clock on */
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+ setbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_GATE);
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+
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+ writel(SUNXI_HDMI_CTRL_ENABLE, &hdmi->ctrl);
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+ writel(SUNXI_HDMI_PAD_CTRL0_HDP, &hdmi->pad_ctrl0);
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+
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+ udelay(1000);
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+
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+ if (readl(&hdmi->hpd) & SUNXI_HDMI_HPD_DETECT)
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+ return 1;
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+
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+ /* No need to keep these running */
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+ clrbits_le32(&hdmi->ctrl, SUNXI_HDMI_CTRL_ENABLE);
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+ clrbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_GATE);
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+ clrbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_HDMI);
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+#ifdef CONFIG_MACH_SUN6I
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+ clrbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_HDMI);
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+#endif
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+ clock_set_pll3(0);
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+
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+ return 0;
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+}
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+
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+/*
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+ * This is the entity that mixes and matches the different layers and inputs.
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+ * Allwinner calls it the back-end, but i like composer better.
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+ */
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+static void sunxi_composer_init(void)
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+{
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+ struct sunxi_ccm_reg * const ccm =
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+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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+ struct sunxi_de_be_reg * const de_be =
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+ (struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
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+ int i;
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+
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+#ifdef CONFIG_MACH_SUN6I
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+ /* Reset off */
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+ setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_DE_BE0);
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+#endif
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+
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+ /* Clocks on */
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+ setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_DE_BE0);
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+ setbits_le32(&ccm->dram_clk_gate, 1 << CCM_DRAM_GATE_OFFSET_DE_BE0);
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+ clock_set_de_mod_clock(&ccm->be0_clk_cfg, 300000000);
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+
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+ /* Engine bug, clear registers after reset */
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+ for (i = 0x0800; i < 0x1000; i += 4)
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+ writel(0, SUNXI_DE_BE0_BASE + i);
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+
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+ setbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_ENABLE);
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+}
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+
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+static void sunxi_composer_mode_set(struct fb_videomode *mode,
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+ unsigned int address)
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+{
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+ struct sunxi_de_be_reg * const de_be =
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+ (struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
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+
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+ writel(SUNXI_DE_BE_HEIGHT(mode->yres) | SUNXI_DE_BE_WIDTH(mode->xres),
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+ &de_be->disp_size);
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+ writel(SUNXI_DE_BE_HEIGHT(mode->yres) | SUNXI_DE_BE_WIDTH(mode->xres),
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+ &de_be->layer0_size);
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+ writel(SUNXI_DE_BE_LAYER_STRIDE(mode->xres), &de_be->layer0_stride);
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+ writel(address << 3, &de_be->layer0_addr_low32b);
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+ writel(address >> 29, &de_be->layer0_addr_high4b);
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+ writel(SUNXI_DE_BE_LAYER_ATTR1_FMT_XRGB8888, &de_be->layer0_attr1_ctrl);
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+
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+ setbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_LAYER0_ENABLE);
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+}
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+
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+/*
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+ * LCDC, what allwinner calls a CRTC, so timing controller and serializer.
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+ */
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+static void sunxi_lcdc_pll_set(int dotclock, int *clk_div, int *clk_double)
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+{
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+ struct sunxi_ccm_reg * const ccm =
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+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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+ int value, n, m, diff;
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+ int best_n = 0, best_m = 0, best_diff = 0x0FFFFFFF;
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+ int best_double = 0;
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+
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+ /*
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+ * Find the lowest divider resulting in a matching clock, if there
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+ * is no match, pick the closest lower clock, as monitors tend to
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+ * not sync to higher frequencies.
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+ */
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+ for (m = 15; m > 0; m--) {
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+ n = (m * dotclock) / 3000;
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+
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+ if ((n >= 9) && (n <= 127)) {
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+ value = (3000 * n) / m;
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+ diff = dotclock - value;
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+ if (diff < best_diff) {
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+ best_diff = diff;
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+ best_m = m;
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+ best_n = n;
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+ best_double = 0;
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+ }
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+ }
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+
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+ /* These are just duplicates */
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+ if (!(m & 1))
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+ continue;
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+
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+ n = (m * dotclock) / 6000;
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+ if ((n >= 9) && (n <= 127)) {
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+ value = (6000 * n) / m;
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+ diff = dotclock - value;
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+ if (diff < best_diff) {
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+ best_diff = diff;
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+ best_m = m;
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+ best_n = n;
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+ best_double = 1;
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+ }
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+ }
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+ }
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+
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+ debug("dotclock: %dkHz = %dkHz: (%d * 3MHz * %d) / %d\n",
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+ dotclock, (best_double + 1) * 3000 * best_n / best_m,
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+ best_double + 1, best_n, best_m);
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+
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+ clock_set_pll3(best_n * 3000000);
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+
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+ writel(CCM_LCD_CH1_CTRL_GATE |
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+ (best_double ? CCM_LCD_CH1_CTRL_PLL3_2X : CCM_LCD_CH1_CTRL_PLL3) |
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+ CCM_LCD_CH1_CTRL_M(best_m), &ccm->lcd0_ch1_clk_cfg);
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+
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+ *clk_div = best_m;
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+ *clk_double = best_double;
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+}
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+
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+static void sunxi_lcdc_init(void)
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+{
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+ struct sunxi_ccm_reg * const ccm =
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+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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+ struct sunxi_lcdc_reg * const lcdc =
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+ (struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
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+
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+ /* Reset off */
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+#ifdef CONFIG_MACH_SUN6I
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+ setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_LCD0);
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+#else
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+ setbits_le32(&ccm->lcd0_ch0_clk_cfg, CCM_LCD_CH0_CTRL_RST);
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+#endif
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+
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+ /* Clock on */
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+ setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_LCD0);
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+
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+ /* Init lcdc */
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+ writel(0, &lcdc->ctrl); /* Disable tcon */
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+ writel(0, &lcdc->int0); /* Disable all interrupts */
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+
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+ /* Disable tcon0 dot clock */
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+ clrbits_le32(&lcdc->tcon0_dclk, SUNXI_LCDC_TCON0_DCLK_ENABLE);
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+
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+ /* Set all io lines to tristate */
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+ writel(0xffffffff, &lcdc->tcon0_io_tristate);
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+ writel(0xffffffff, &lcdc->tcon1_io_tristate);
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+}
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+
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+static void sunxi_lcdc_mode_set(struct fb_videomode *mode,
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+ int *clk_div, int *clk_double)
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+{
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+ struct sunxi_lcdc_reg * const lcdc =
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+ (struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
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+ int bp, total;
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+
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+ /* Use tcon1 */
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+ clrsetbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_IO_MAP_MASK,
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+ SUNXI_LCDC_CTRL_IO_MAP_TCON1);
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+
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+ /* Enabled, 0x1e start delay */
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+ writel(SUNXI_LCDC_TCON1_CTRL_ENABLE |
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+ SUNXI_LCDC_TCON1_CTRL_CLK_DELAY(0x1e), &lcdc->tcon1_ctrl);
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+
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+ writel(SUNXI_LCDC_X(mode->xres) | SUNXI_LCDC_Y(mode->yres),
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+ &lcdc->tcon1_timing_source);
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+ writel(SUNXI_LCDC_X(mode->xres) | SUNXI_LCDC_Y(mode->yres),
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+ &lcdc->tcon1_timing_scale);
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+ writel(SUNXI_LCDC_X(mode->xres) | SUNXI_LCDC_Y(mode->yres),
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+ &lcdc->tcon1_timing_out);
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+
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+ bp = mode->hsync_len + mode->left_margin;
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+ total = mode->xres + mode->right_margin + bp;
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+ writel(SUNXI_LCDC_TCON1_TIMING_H_TOTAL(total) |
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+ SUNXI_LCDC_TCON1_TIMING_H_BP(bp), &lcdc->tcon1_timing_h);
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+
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+ bp = mode->vsync_len + mode->upper_margin;
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+ total = mode->yres + mode->lower_margin + bp;
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+ writel(SUNXI_LCDC_TCON1_TIMING_V_TOTAL(total) |
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+ SUNXI_LCDC_TCON1_TIMING_V_BP(bp), &lcdc->tcon1_timing_v);
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+
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+ writel(SUNXI_LCDC_X(mode->hsync_len) | SUNXI_LCDC_Y(mode->vsync_len),
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+ &lcdc->tcon1_timing_sync);
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+
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+ sunxi_lcdc_pll_set(mode->pixclock, clk_div, clk_double);
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+}
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+
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+#ifdef CONFIG_MACH_SUN6I
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+static void sunxi_drc_init(void)
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+{
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+ struct sunxi_ccm_reg * const ccm =
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+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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+
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+ /* On sun6i the drc must be clocked even when in pass-through mode */
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+ setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_DRC0);
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+ clock_set_de_mod_clock(&ccm->iep_drc0_clk_cfg, 300000000);
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+}
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+#endif
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+
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+static void sunxi_hdmi_mode_set(struct fb_videomode *mode,
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+ int clk_div, int clk_double)
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+{
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+ struct sunxi_hdmi_reg * const hdmi =
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+ (struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
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+ int x, y;
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+
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+ /* Write clear interrupt status bits */
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+ writel(SUNXI_HDMI_IRQ_STATUS_BITS, &hdmi->irq);
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+
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+ /* Init various registers, select pll3 as clock source */
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+ writel(SUNXI_HDMI_VIDEO_POL_TX_CLK, &hdmi->video_polarity);
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+ writel(SUNXI_HDMI_PAD_CTRL0_RUN, &hdmi->pad_ctrl0);
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+ writel(SUNXI_HDMI_PAD_CTRL1, &hdmi->pad_ctrl1);
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+ writel(SUNXI_HDMI_PLL_CTRL, &hdmi->pll_ctrl);
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+ writel(SUNXI_HDMI_PLL_DBG0_PLL3, &hdmi->pll_dbg0);
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+
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+ /* Setup clk div and doubler */
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+ clrsetbits_le32(&hdmi->pll_ctrl, SUNXI_HDMI_PLL_CTRL_DIV_MASK,
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+ SUNXI_HDMI_PLL_CTRL_DIV(clk_div));
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+ if (!clk_double)
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+ setbits_le32(&hdmi->pad_ctrl1, SUNXI_HDMI_PAD_CTRL1_HALVE);
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+
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+ /* Setup timing registers */
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+ writel(SUNXI_HDMI_Y(mode->yres) | SUNXI_HDMI_X(mode->xres),
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+ &hdmi->video_size);
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+
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+ x = mode->hsync_len + mode->left_margin;
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+ y = mode->vsync_len + mode->upper_margin;
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+ writel(SUNXI_HDMI_Y(y) | SUNXI_HDMI_X(x), &hdmi->video_bp);
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+
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+ x = mode->right_margin;
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+ y = mode->lower_margin;
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+ writel(SUNXI_HDMI_Y(y) | SUNXI_HDMI_X(x), &hdmi->video_fp);
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+
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+ x = mode->hsync_len;
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+ y = mode->vsync_len;
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+ writel(SUNXI_HDMI_Y(y) | SUNXI_HDMI_X(x), &hdmi->video_spw);
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+
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+ if (mode->sync & FB_SYNC_HOR_HIGH_ACT)
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+ setbits_le32(&hdmi->video_polarity, SUNXI_HDMI_VIDEO_POL_HOR);
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+
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+ if (mode->sync & FB_SYNC_VERT_HIGH_ACT)
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+ setbits_le32(&hdmi->video_polarity, SUNXI_HDMI_VIDEO_POL_VER);
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+}
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+
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+static void sunxi_engines_init(void)
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+{
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+ sunxi_composer_init();
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+ sunxi_lcdc_init();
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+#ifdef CONFIG_MACH_SUN6I
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+ sunxi_drc_init();
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+#endif
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+}
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+
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+static void sunxi_mode_set(struct fb_videomode *mode, unsigned int address)
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+{
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+ struct sunxi_de_be_reg * const de_be =
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+ (struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
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+ struct sunxi_lcdc_reg * const lcdc =
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+ (struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
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+ struct sunxi_hdmi_reg * const hdmi =
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+ (struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
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+ int clk_div, clk_double;
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+ int retries = 3;
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+
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+retry:
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+ clrbits_le32(&hdmi->video_ctrl, SUNXI_HDMI_VIDEO_CTRL_ENABLE);
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+ clrbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_TCON_ENABLE);
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+ clrbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_START);
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+
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+ sunxi_composer_mode_set(mode, address);
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+ sunxi_lcdc_mode_set(mode, &clk_div, &clk_double);
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+ sunxi_hdmi_mode_set(mode, clk_div, clk_double);
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+
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+ setbits_le32(&de_be->reg_ctrl, SUNXI_DE_BE_REG_CTRL_LOAD_REGS);
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+ setbits_le32(&de_be->mode, SUNXI_DE_BE_MODE_START);
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+
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+ udelay(1000000 / mode->refresh + 500);
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+
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+ setbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_TCON_ENABLE);
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+
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+ udelay(1000000 / mode->refresh + 500);
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+
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+ setbits_le32(&hdmi->video_ctrl, SUNXI_HDMI_VIDEO_CTRL_ENABLE);
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+
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+ udelay(1000000 / mode->refresh + 500);
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+
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+ /*
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+ * Sometimes the display pipeline does not sync up properly, if
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+ * this happens the hdmi fifo underrun or overrun bits are set.
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+ */
|
|
|
+ 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;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Simplefb support.
|
|
|
+ */
|
|
|
+#if defined(CONFIG_OF_BOARD_SETUP) && defined(CONFIG_VIDEO_DT_SIMPLEFB)
|
|
|
+int sunxi_simplefb_setup(void *blob)
|
|
|
+{
|
|
|
+ static GraphicDevice *graphic_device = &sunxi_display.graphic_device;
|
|
|
+ int offset, ret;
|
|
|
+
|
|
|
+ if (!sunxi_display.enabled)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ /* Find a framebuffer node, with pipeline == "de_be0-lcd0-hdmi" */
|
|
|
+ offset = fdt_node_offset_by_compatible(blob, -1,
|
|
|
+ "allwinner,simple-framebuffer");
|
|
|
+ while (offset >= 0) {
|
|
|
+ ret = fdt_find_string(blob, offset, "allwinner,pipeline",
|
|
|
+ "de_be0-lcd0-hdmi");
|
|
|
+ if (ret == 0)
|
|
|
+ break;
|
|
|
+ offset = fdt_node_offset_by_compatible(blob, offset,
|
|
|
+ "allwinner,simple-framebuffer");
|
|
|
+ }
|
|
|
+ if (offset < 0) {
|
|
|
+ eprintf("Cannot setup simplefb: node not found\n");
|
|
|
+ return 0; /* Keep older kernels working */
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = fdt_setup_simplefb_node(blob, offset, gd->fb_base,
|
|
|
+ graphic_device->winSizeX, graphic_device->winSizeY,
|
|
|
+ graphic_device->winSizeX * graphic_device->gdfBytesPP,
|
|
|
+ "x8r8g8b8");
|
|
|
+ if (ret)
|
|
|
+ eprintf("Cannot setup simplefb: Error setting properties\n");
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+#endif /* CONFIG_OF_BOARD_SETUP && CONFIG_VIDEO_DT_SIMPLEFB */
|