tegra: Add SOC support for display/lcd

Add support for the LCD peripheral at the Tegra2 SOC level. A separate
LCD driver will use this functionality to configure the display.

Signed-off-by: Mayuresh Kulkarni <mkulkarni@nvidia.com>
Mayuresh Kulkarni:
- changes to remove bitfields and clean up for submission

Signed-off-by: Simon Glass <sjg@chromium.org>
Simon Glass:
- simplify code, move clock control into here, clean-up
Signed-off-by: Tom Warren <twarren@nvidia.com>

2 files changed, 410 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/tegra20/Makefile b/arch/arm/cpu/armv7/tegra20/Makefile
index 77cb4d1..54ed8c4 100644
--- a/arch/arm/cpu/armv7/tegra20/Makefile
+++ b/arch/arm/cpu/armv7/tegra20/Makefile
@@ -29,6 +29,7 @@ LIB	=  $(obj)lib$(SOC).o
 
 COBJS-$(CONFIG_USB_EHCI_TEGRA) += usb.o
 COBJS-$(CONFIG_PWM_TEGRA) += pwm.o
+COBJS-$(CONFIG_VIDEO_TEGRA) += display.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/arch/arm/cpu/armv7/tegra20/display.c b/arch/arm/cpu/armv7/tegra20/display.c
new file mode 100644
index 0000000..031f9a8
--- /dev/null
+++ b/arch/arm/cpu/armv7/tegra20/display.c
@@ -0,0 +1,409 @@
+/*
+ *  (C) Copyright 2010
+ *  NVIDIA Corporation <www.nvidia.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#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/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, 1);
+	v_dda = (win->h * 0x1000) / max(win->out_h - 1, 1);
+
+	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]);
+}
+
+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;
+}