[U-Boot] [PATCH 3/5] arm: tegra30: video: integrate display driver for t30
Marcel Ziswiler
marcel.ziswiler at toradex.com
Thu Aug 20 13:29:10 CEST 2015
On popular request make the display driver from T20 work on T30 as
well. Turned out to be quite straight forward. However a few notes
about some things encountered during porting: Of course the T30 device
tree was completely missing host1x as well as PWM support but it turns
out this can simply be copied from T20 supplementing some tegra30-
compatible nodes here and there while comparing it with the Linux
device tree includes.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
---
The older Chromium U-Boot 2011.06 which to my knowledge was the only
prior attempt at enabling a display driver for T30 for whatever reason
got some clocking stuff mixed up. Turns out at least for a single
display controller T20 and T30 can be clocked quite similar.
arch/arm/dts/tegra30.dtsi | 104 ++++++++
arch/arm/include/asm/arch-tegra30/display.h | 13 +
arch/arm/include/asm/arch-tegra30/pwm.h | 14 +
arch/arm/mach-tegra/tegra30/Makefile | 6 +-
arch/arm/mach-tegra/tegra30/display.c | 394 ++++++++++++++++++++++++++++
include/configs/tegra30-common.h | 3 +
6 files changed, 533 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/include/asm/arch-tegra30/display.h
create mode 100644 arch/arm/include/asm/arch-tegra30/pwm.h
create mode 100644 arch/arm/mach-tegra/tegra30/display.c
diff --git a/arch/arm/dts/tegra30.dtsi b/arch/arm/dts/tegra30.dtsi
index 5ea7e34..7669b27 100644
--- a/arch/arm/dts/tegra30.dtsi
+++ b/arch/arm/dts/tegra30.dtsi
@@ -8,6 +8,104 @@
compatible = "nvidia,tegra30";
interrupt-parent = <&intc>;
+ host1x {
+ compatible = "nvidia,tegra30-host1x", "simple-bus";
+ reg = <0x50000000 0x00024000>;
+ interrupts = <0 65 0x04 /* mpcore syncpt */
+ 0 67 0x04>; /* mpcore general */
+ status = "disabled";
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ ranges = <0x54000000 0x54000000 0x04000000>;
+
+ /* video-encoding/decoding */
+ mpe {
+ reg = <0x54040000 0x00040000>;
+ interrupts = <0 68 0x04>;
+ status = "disabled";
+ };
+
+ /* video input */
+ vi {
+ reg = <0x54080000 0x00040000>;
+ interrupts = <0 69 0x04>;
+ status = "disabled";
+ };
+
+ /* EPP */
+ epp {
+ reg = <0x540c0000 0x00040000>;
+ interrupts = <0 70 0x04>;
+ status = "disabled";
+ };
+
+ /* ISP */
+ isp {
+ reg = <0x54100000 0x00040000>;
+ interrupts = <0 71 0x04>;
+ status = "disabled";
+ };
+
+ /* 2D engine */
+ gr2d {
+ reg = <0x54140000 0x00040000>;
+ interrupts = <0 72 0x04>;
+ status = "disabled";
+ };
+
+ /* 3D engine */
+ gr3d {
+ reg = <0x54180000 0x00040000>;
+ status = "disabled";
+ };
+
+ /* display controllers */
+ dc at 54200000 {
+ compatible = "nvidia,tegra30-dc", "nvidia,tegra20-dc";
+ reg = <0x54200000 0x00040000>;
+ interrupts = <0 73 0x04>;
+ status = "disabled";
+
+ rgb {
+ status = "disabled";
+ };
+ };
+
+ dc at 54240000 {
+ compatible = "nvidia,tegra30-dc";
+ reg = <0x54240000 0x00040000>;
+ interrupts = <0 74 0x04>;
+ status = "disabled";
+
+ rgb {
+ status = "disabled";
+ };
+ };
+
+ /* outputs */
+ hdmi {
+ compatible = "nvidia,tegra30-hdmi";
+ reg = <0x54280000 0x00040000>;
+ interrupts = <0 75 0x04>;
+ status = "disabled";
+ };
+
+ tvo {
+ compatible = "nvidia,tegra30-tvo";
+ reg = <0x542c0000 0x00040000>;
+ interrupts = <0 76 0x04>;
+ status = "disabled";
+ };
+
+ dsi {
+ compatible = "nvidia,tegra30-dsi";
+ reg = <0x54300000 0x00040000>;
+ status = "disabled";
+ };
+ };
+
intc: interrupt-controller at 50041000 {
compatible = "arm,cortex-a9-gic";
reg = <0x50041000 0x1000
@@ -271,6 +369,12 @@
status = "disabled";
};
+ pwm: pwm at 7000a000 {
+ compatible = "nvidia,tegra30-pwm", "nvidia,tegra20-pwm";
+ reg = <0x7000a000 0x100>;
+ #pwm-cells = <2>;
+ };
+
spi at 7000d400 {
compatible = "nvidia,tegra30-slink", "nvidia,tegra20-slink";
reg = <0x7000d400 0x200>;
diff --git a/arch/arm/include/asm/arch-tegra30/display.h b/arch/arm/include/asm/arch-tegra30/display.h
new file mode 100644
index 0000000..6a46541
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra30/display.h
@@ -0,0 +1,13 @@
+/*
+ * (C) Copyright 2010
+ * NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __ASM_ARCH_TEGRA30_DISPLAY_H
+#define __ASM_ARCH_TEGRA30_DISPLAY_H
+
+#include <asm/arch-tegra20/display.h>
+
+#endif /* __ASM_ARCH_TEGRA30_DISPLAY_H */
diff --git a/arch/arm/include/asm/arch-tegra30/pwm.h b/arch/arm/include/asm/arch-tegra30/pwm.h
new file mode 100644
index 0000000..98d24d0
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra30/pwm.h
@@ -0,0 +1,14 @@
+/*
+ * Tegra pulse width frequency modulator definitions
+ *
+ * Copyright (c) 2011 The Chromium OS Authors.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __ASM_ARCH_TEGRA30_PWM_H
+#define __ASM_ARCH_TEGRA30_PWM_H
+
+#include <asm/arch-tegra/pwm.h>
+
+#endif /* __ASM_ARCH_TEGRA30_PWM_H */
diff --git a/arch/arm/mach-tegra/tegra30/Makefile b/arch/arm/mach-tegra/tegra30/Makefile
index bc250de..ef1ceb1 100644
--- a/arch/arm/mach-tegra/tegra30/Makefile
+++ b/arch/arm/mach-tegra/tegra30/Makefile
@@ -14,6 +14,10 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
-obj-$(CONFIG_SPL_BUILD) += cpu.o
+ifdef CONFIG_SPL_BUILD
+obj-y += cpu.o
+else
+obj-$(CONFIG_VIDEO_TEGRA) += display.o
+endif
obj-y += clock.o funcmux.o pinmux.o
diff --git a/arch/arm/mach-tegra/tegra30/display.c b/arch/arm/mach-tegra/tegra30/display.c
new file mode 100644
index 0000000..b7605ff
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra30/display.c
@@ -0,0 +1,394 @@
+/*
+ * (C) Copyright 2010
+ * NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/tegra.h>
+#include <asm/arch/display.h>
+#include <asm/arch-tegra/dc.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra/timer.h>
+
+static struct fdt_disp_config config;
+
+static void update_window(struct dc_ctlr *dc, struct disp_ctl_win *win)
+{
+ unsigned h_dda, v_dda;
+ unsigned long val;
+
+ val = readl(&dc->cmd.disp_win_header);
+ val |= WINDOW_A_SELECT;
+ writel(val, &dc->cmd.disp_win_header);
+
+ writel(win->fmt, &dc->win.color_depth);
+
+ clrsetbits_le32(&dc->win.byte_swap, BYTE_SWAP_MASK,
+ BYTE_SWAP_NOSWAP << BYTE_SWAP_SHIFT);
+
+ val = win->out_x << H_POSITION_SHIFT;
+ val |= win->out_y << V_POSITION_SHIFT;
+ writel(val, &dc->win.pos);
+
+ val = win->out_w << H_SIZE_SHIFT;
+ val |= win->out_h << V_SIZE_SHIFT;
+ writel(val, &dc->win.size);
+
+ val = (win->w * win->bpp / 8) << H_PRESCALED_SIZE_SHIFT;
+ val |= win->h << V_PRESCALED_SIZE_SHIFT;
+ writel(val, &dc->win.prescaled_size);
+
+ writel(0, &dc->win.h_initial_dda);
+ writel(0, &dc->win.v_initial_dda);
+
+ h_dda = (win->w * 0x1000) / max(win->out_w - 1, 1U);
+ v_dda = (win->h * 0x1000) / max(win->out_h - 1, 1U);
+
+ val = h_dda << H_DDA_INC_SHIFT;
+ val |= v_dda << V_DDA_INC_SHIFT;
+ writel(val, &dc->win.dda_increment);
+
+ writel(win->stride, &dc->win.line_stride);
+ writel(0, &dc->win.buf_stride);
+
+ val = WIN_ENABLE;
+ if (win->bpp < 24)
+ val |= COLOR_EXPAND;
+ writel(val, &dc->win.win_opt);
+
+ writel((unsigned long)win->phys_addr, &dc->winbuf.start_addr);
+ writel(win->x, &dc->winbuf.addr_h_offset);
+ writel(win->y, &dc->winbuf.addr_v_offset);
+
+ writel(0xff00, &dc->win.blend_nokey);
+ writel(0xff00, &dc->win.blend_1win);
+
+ val = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
+ val |= GENERAL_UPDATE | WIN_A_UPDATE;
+ writel(val, &dc->cmd.state_ctrl);
+}
+
+static void write_pair(struct fdt_disp_config *config, int item, u32 *reg)
+{
+ writel(config->horiz_timing[item] |
+ (config->vert_timing[item] << 16), reg);
+}
+
+static int update_display_mode(struct dc_disp_reg *disp,
+ struct fdt_disp_config *config)
+{
+ unsigned long val;
+ unsigned long rate;
+ unsigned long div;
+
+ writel(0x0, &disp->disp_timing_opt);
+ write_pair(config, FDT_LCD_TIMING_REF_TO_SYNC, &disp->ref_to_sync);
+ write_pair(config, FDT_LCD_TIMING_SYNC_WIDTH, &disp->sync_width);
+ write_pair(config, FDT_LCD_TIMING_BACK_PORCH, &disp->back_porch);
+ write_pair(config, FDT_LCD_TIMING_FRONT_PORCH, &disp->front_porch);
+
+ writel(config->width | (config->height << 16), &disp->disp_active);
+
+ val = DE_SELECT_ACTIVE << DE_SELECT_SHIFT;
+ val |= DE_CONTROL_NORMAL << DE_CONTROL_SHIFT;
+ writel(val, &disp->data_enable_opt);
+
+ val = DATA_FORMAT_DF1P1C << DATA_FORMAT_SHIFT;
+ val |= DATA_ALIGNMENT_MSB << DATA_ALIGNMENT_SHIFT;
+ val |= DATA_ORDER_RED_BLUE << DATA_ORDER_SHIFT;
+ writel(val, &disp->disp_interface_ctrl);
+
+ /*
+ * The pixel clock divider is in 7.1 format (where the bottom bit
+ * represents 0.5). Here we calculate the divider needed to get from
+ * the display clock (typically 600MHz) to the pixel clock. We round
+ * up or down as requried.
+ */
+ rate = clock_get_periph_rate(PERIPH_ID_DISP1, CLOCK_ID_CGENERAL);
+ div = ((rate * 2 + config->pixel_clock / 2) / config->pixel_clock) - 2;
+ debug("Display clock %lu, divider %lu\n", rate, div);
+
+ writel(0x00010001, &disp->shift_clk_opt);
+
+ val = PIXEL_CLK_DIVIDER_PCD1 << PIXEL_CLK_DIVIDER_SHIFT;
+ val |= div << SHIFT_CLK_DIVIDER_SHIFT;
+ writel(val, &disp->disp_clk_ctrl);
+
+ return 0;
+}
+
+/* Start up the display and turn on power to PWMs */
+static void basic_init(struct dc_cmd_reg *cmd)
+{
+ u32 val;
+
+ writel(0x00000100, &cmd->gen_incr_syncpt_ctrl);
+ writel(0x0000011a, &cmd->cont_syncpt_vsync);
+ writel(0x00000000, &cmd->int_type);
+ writel(0x00000000, &cmd->int_polarity);
+ writel(0x00000000, &cmd->int_mask);
+ writel(0x00000000, &cmd->int_enb);
+
+ val = PW0_ENABLE | PW1_ENABLE | PW2_ENABLE;
+ val |= PW3_ENABLE | PW4_ENABLE | PM0_ENABLE;
+ val |= PM1_ENABLE;
+ writel(val, &cmd->disp_pow_ctrl);
+
+ val = readl(&cmd->disp_cmd);
+ val |= CTRL_MODE_C_DISPLAY << CTRL_MODE_SHIFT;
+ writel(val, &cmd->disp_cmd);
+}
+
+static void basic_init_timer(struct dc_disp_reg *disp)
+{
+ writel(0x00000020, &disp->mem_high_pri);
+ writel(0x00000001, &disp->mem_high_pri_timer);
+}
+
+static const u32 rgb_enb_tab[PIN_REG_COUNT] = {
+ 0x00000000,
+ 0x00000000,
+ 0x00000000,
+ 0x00000000,
+};
+
+static const u32 rgb_polarity_tab[PIN_REG_COUNT] = {
+ 0x00000000,
+ 0x01000000,
+ 0x00000000,
+ 0x00000000,
+};
+
+static const u32 rgb_data_tab[PIN_REG_COUNT] = {
+ 0x00000000,
+ 0x00000000,
+ 0x00000000,
+ 0x00000000,
+};
+
+static const u32 rgb_sel_tab[PIN_OUTPUT_SEL_COUNT] = {
+ 0x00000000,
+ 0x00000000,
+ 0x00000000,
+ 0x00000000,
+ 0x00210222,
+ 0x00002200,
+ 0x00020000,
+};
+
+static void rgb_enable(struct dc_com_reg *com)
+{
+ int i;
+
+ for (i = 0; i < PIN_REG_COUNT; i++) {
+ writel(rgb_enb_tab[i], &com->pin_output_enb[i]);
+ writel(rgb_polarity_tab[i], &com->pin_output_polarity[i]);
+ writel(rgb_data_tab[i], &com->pin_output_data[i]);
+ }
+
+ for (i = 0; i < PIN_OUTPUT_SEL_COUNT; i++)
+ writel(rgb_sel_tab[i], &com->pin_output_sel[i]);
+}
+
+static int setup_window(struct disp_ctl_win *win,
+ struct fdt_disp_config *config)
+{
+ win->x = 0;
+ win->y = 0;
+ win->w = config->width;
+ win->h = config->height;
+ win->out_x = 0;
+ win->out_y = 0;
+ win->out_w = config->width;
+ win->out_h = config->height;
+ win->phys_addr = config->frame_buffer;
+ win->stride = config->width * (1 << config->log2_bpp) / 8;
+ debug("%s: depth = %d\n", __func__, config->log2_bpp);
+ switch (config->log2_bpp) {
+ case 5:
+ case 24:
+ win->fmt = COLOR_DEPTH_R8G8B8A8;
+ win->bpp = 32;
+ break;
+ case 4:
+ win->fmt = COLOR_DEPTH_B5G6R5;
+ win->bpp = 16;
+ break;
+
+ default:
+ debug("Unsupported LCD bit depth");
+ return -1;
+ }
+
+ return 0;
+}
+
+struct fdt_disp_config *tegra_display_get_config(void)
+{
+ return config.valid ? &config : NULL;
+}
+
+static void debug_timing(const char *name, unsigned int timing[])
+{
+#ifdef DEBUG
+ int i;
+
+ debug("%s timing: ", name);
+ for (i = 0; i < FDT_LCD_TIMING_COUNT; i++)
+ debug("%d ", timing[i]);
+ debug("\n");
+#endif
+}
+
+/**
+ * Decode panel information from the fdt, according to a standard binding
+ *
+ * @param blob fdt blob
+ * @param node offset of fdt node to read from
+ * @param config structure to store fdt config into
+ * @return 0 if ok, -ve on error
+ */
+static int tegra_decode_panel(const void *blob, int node,
+ struct fdt_disp_config *config)
+{
+ int front, back, ref;
+
+ config->width = fdtdec_get_int(blob, node, "xres", -1);
+ config->height = fdtdec_get_int(blob, node, "yres", -1);
+ config->pixel_clock = fdtdec_get_int(blob, node, "clock", 0);
+ if (!config->pixel_clock || config->width == -1 ||
+ config->height == -1) {
+ debug("%s: Pixel parameters missing\n", __func__);
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ back = fdtdec_get_int(blob, node, "left-margin", -1);
+ front = fdtdec_get_int(blob, node, "right-margin", -1);
+ ref = fdtdec_get_int(blob, node, "hsync-len", -1);
+ if ((back | front | ref) == -1) {
+ debug("%s: Horizontal parameters missing\n", __func__);
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ /* Use a ref-to-sync of 1 always, and take this from the front porch */
+ config->horiz_timing[FDT_LCD_TIMING_REF_TO_SYNC] = 1;
+ config->horiz_timing[FDT_LCD_TIMING_SYNC_WIDTH] = ref;
+ config->horiz_timing[FDT_LCD_TIMING_BACK_PORCH] = back;
+ config->horiz_timing[FDT_LCD_TIMING_FRONT_PORCH] = front -
+ config->horiz_timing[FDT_LCD_TIMING_REF_TO_SYNC];
+ debug_timing("horiz", config->horiz_timing);
+
+ back = fdtdec_get_int(blob, node, "upper-margin", -1);
+ front = fdtdec_get_int(blob, node, "lower-margin", -1);
+ ref = fdtdec_get_int(blob, node, "vsync-len", -1);
+ if ((back | front | ref) == -1) {
+ debug("%s: Vertical parameters missing\n", __func__);
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ config->vert_timing[FDT_LCD_TIMING_REF_TO_SYNC] = 1;
+ config->vert_timing[FDT_LCD_TIMING_SYNC_WIDTH] = ref;
+ config->vert_timing[FDT_LCD_TIMING_BACK_PORCH] = back;
+ config->vert_timing[FDT_LCD_TIMING_FRONT_PORCH] = front -
+ config->vert_timing[FDT_LCD_TIMING_REF_TO_SYNC];
+ debug_timing("vert", config->vert_timing);
+
+ return 0;
+}
+
+/**
+ * Decode the display controller information from the fdt.
+ *
+ * @param blob fdt blob
+ * @param config structure to store fdt config into
+ * @return 0 if ok, -ve on error
+ */
+static int tegra_display_decode_config(const void *blob,
+ struct fdt_disp_config *config)
+{
+ int node, rgb;
+ int bpp, bit;
+
+ /* TODO: Support multiple controllers */
+ node = fdtdec_next_compatible(blob, 0, COMPAT_NVIDIA_TEGRA20_DC);
+ if (node < 0) {
+ debug("%s: Cannot find display controller node in fdt\n",
+ __func__);
+ return node;
+ }
+ config->disp = (struct disp_ctlr *)fdtdec_get_addr(blob, node, "reg");
+ if (!config->disp) {
+ debug("%s: No display controller address\n", __func__);
+ return -1;
+ }
+
+ rgb = fdt_subnode_offset(blob, node, "rgb");
+
+ config->panel_node = fdtdec_lookup_phandle(blob, rgb, "nvidia,panel");
+ if (config->panel_node < 0) {
+ debug("%s: Cannot find panel information\n", __func__);
+ return -1;
+ }
+
+ if (tegra_decode_panel(blob, config->panel_node, config)) {
+ debug("%s: Failed to decode panel information\n", __func__);
+ return -1;
+ }
+
+ bpp = fdtdec_get_int(blob, config->panel_node, "nvidia,bits-per-pixel",
+ -1);
+ bit = ffs(bpp) - 1;
+ if (bpp == (1 << bit))
+ config->log2_bpp = bit;
+ else
+ config->log2_bpp = bpp;
+ if (bpp == -1) {
+ debug("%s: Pixel bpp parameters missing\n", __func__);
+ return -FDT_ERR_NOTFOUND;
+ }
+ config->bpp = bpp;
+
+ config->valid = 1; /* we have a valid configuration */
+
+ return 0;
+}
+
+int tegra_display_probe(const void *blob, void *default_lcd_base)
+{
+ struct disp_ctl_win window;
+ struct dc_ctlr *dc;
+
+ if (tegra_display_decode_config(blob, &config))
+ return -1;
+
+ config.frame_buffer = (u32)default_lcd_base;
+
+ dc = (struct dc_ctlr *)config.disp;
+
+ /*
+ * A header file for clock constants was NAKed upstream.
+ * TODO: Put this into the FDT and fdt_lcd struct when we have clock
+ * support there
+ */
+ clock_start_periph_pll(PERIPH_ID_HOST1X, CLOCK_ID_PERIPH,
+ 144 * 1000000);
+ clock_start_periph_pll(PERIPH_ID_DISP1, CLOCK_ID_CGENERAL,
+ 600 * 1000000);
+ basic_init(&dc->cmd);
+ basic_init_timer(&dc->disp);
+ rgb_enable(&dc->com);
+
+ if (config.pixel_clock)
+ update_display_mode(&dc->disp, &config);
+
+ if (setup_window(&window, &config))
+ return -1;
+
+ update_window(dc, &window);
+
+ return 0;
+}
diff --git a/include/configs/tegra30-common.h b/include/configs/tegra30-common.h
index 3e8e3c1..0360578 100644
--- a/include/configs/tegra30-common.h
+++ b/include/configs/tegra30-common.h
@@ -70,6 +70,9 @@
#define CONFIG_SYS_SPL_MALLOC_START 0x80090000
#define CONFIG_SPL_STACK 0x800ffffc
+/* Align LCD to 1MB boundary */
+#define CONFIG_LCD_ALIGNMENT MMU_SECTION_SIZE
+
/* For USB EHCI controller */
#define CONFIG_EHCI_IS_TDI
#define CONFIG_USB_EHCI_TXFIFO_THRESH 0x10
--
2.4.3
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