3 * NVIDIA Corporation <www.nvidia.com>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/clock.h>
11 #include <asm/arch/tegra.h>
12 #include <asm/arch/display.h>
13 #include <asm/arch/dc.h>
14 #include <asm/arch-tegra/clk_rst.h>
15 #include <asm/arch-tegra/timer.h>
17 static struct fdt_disp_config config;
19 static void update_window(struct dc_ctlr *dc, struct disp_ctl_win *win)
21 unsigned h_dda, v_dda;
24 val = readl(&dc->cmd.disp_win_header);
25 val |= WINDOW_A_SELECT;
26 writel(val, &dc->cmd.disp_win_header);
28 writel(win->fmt, &dc->win.color_depth);
30 clrsetbits_le32(&dc->win.byte_swap, BYTE_SWAP_MASK,
31 BYTE_SWAP_NOSWAP << BYTE_SWAP_SHIFT);
33 val = win->out_x << H_POSITION_SHIFT;
34 val |= win->out_y << V_POSITION_SHIFT;
35 writel(val, &dc->win.pos);
37 val = win->out_w << H_SIZE_SHIFT;
38 val |= win->out_h << V_SIZE_SHIFT;
39 writel(val, &dc->win.size);
41 val = (win->w * win->bpp / 8) << H_PRESCALED_SIZE_SHIFT;
42 val |= win->h << V_PRESCALED_SIZE_SHIFT;
43 writel(val, &dc->win.prescaled_size);
45 writel(0, &dc->win.h_initial_dda);
46 writel(0, &dc->win.v_initial_dda);
48 h_dda = (win->w * 0x1000) / max(win->out_w - 1, 1);
49 v_dda = (win->h * 0x1000) / max(win->out_h - 1, 1);
51 val = h_dda << H_DDA_INC_SHIFT;
52 val |= v_dda << V_DDA_INC_SHIFT;
53 writel(val, &dc->win.dda_increment);
55 writel(win->stride, &dc->win.line_stride);
56 writel(0, &dc->win.buf_stride);
61 writel(val, &dc->win.win_opt);
63 writel((unsigned long)win->phys_addr, &dc->winbuf.start_addr);
64 writel(win->x, &dc->winbuf.addr_h_offset);
65 writel(win->y, &dc->winbuf.addr_v_offset);
67 writel(0xff00, &dc->win.blend_nokey);
68 writel(0xff00, &dc->win.blend_1win);
70 val = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
71 val |= GENERAL_UPDATE | WIN_A_UPDATE;
72 writel(val, &dc->cmd.state_ctrl);
75 static void write_pair(struct fdt_disp_config *config, int item, u32 *reg)
77 writel(config->horiz_timing[item] |
78 (config->vert_timing[item] << 16), reg);
81 static int update_display_mode(struct dc_disp_reg *disp,
82 struct fdt_disp_config *config)
88 writel(0x0, &disp->disp_timing_opt);
89 write_pair(config, FDT_LCD_TIMING_REF_TO_SYNC, &disp->ref_to_sync);
90 write_pair(config, FDT_LCD_TIMING_SYNC_WIDTH, &disp->sync_width);
91 write_pair(config, FDT_LCD_TIMING_BACK_PORCH, &disp->back_porch);
92 write_pair(config, FDT_LCD_TIMING_FRONT_PORCH, &disp->front_porch);
94 writel(config->width | (config->height << 16), &disp->disp_active);
96 val = DE_SELECT_ACTIVE << DE_SELECT_SHIFT;
97 val |= DE_CONTROL_NORMAL << DE_CONTROL_SHIFT;
98 writel(val, &disp->data_enable_opt);
100 val = DATA_FORMAT_DF1P1C << DATA_FORMAT_SHIFT;
101 val |= DATA_ALIGNMENT_MSB << DATA_ALIGNMENT_SHIFT;
102 val |= DATA_ORDER_RED_BLUE << DATA_ORDER_SHIFT;
103 writel(val, &disp->disp_interface_ctrl);
106 * The pixel clock divider is in 7.1 format (where the bottom bit
107 * represents 0.5). Here we calculate the divider needed to get from
108 * the display clock (typically 600MHz) to the pixel clock. We round
109 * up or down as requried.
111 rate = clock_get_periph_rate(PERIPH_ID_DISP1, CLOCK_ID_CGENERAL);
112 div = ((rate * 2 + config->pixel_clock / 2) / config->pixel_clock) - 2;
113 debug("Display clock %lu, divider %lu\n", rate, div);
115 writel(0x00010001, &disp->shift_clk_opt);
117 val = PIXEL_CLK_DIVIDER_PCD1 << PIXEL_CLK_DIVIDER_SHIFT;
118 val |= div << SHIFT_CLK_DIVIDER_SHIFT;
119 writel(val, &disp->disp_clk_ctrl);
124 /* Start up the display and turn on power to PWMs */
125 static void basic_init(struct dc_cmd_reg *cmd)
129 writel(0x00000100, &cmd->gen_incr_syncpt_ctrl);
130 writel(0x0000011a, &cmd->cont_syncpt_vsync);
131 writel(0x00000000, &cmd->int_type);
132 writel(0x00000000, &cmd->int_polarity);
133 writel(0x00000000, &cmd->int_mask);
134 writel(0x00000000, &cmd->int_enb);
136 val = PW0_ENABLE | PW1_ENABLE | PW2_ENABLE;
137 val |= PW3_ENABLE | PW4_ENABLE | PM0_ENABLE;
139 writel(val, &cmd->disp_pow_ctrl);
141 val = readl(&cmd->disp_cmd);
142 val |= CTRL_MODE_C_DISPLAY << CTRL_MODE_SHIFT;
143 writel(val, &cmd->disp_cmd);
146 static void basic_init_timer(struct dc_disp_reg *disp)
148 writel(0x00000020, &disp->mem_high_pri);
149 writel(0x00000001, &disp->mem_high_pri_timer);
152 static const u32 rgb_enb_tab[PIN_REG_COUNT] = {
159 static const u32 rgb_polarity_tab[PIN_REG_COUNT] = {
166 static const u32 rgb_data_tab[PIN_REG_COUNT] = {
173 static const u32 rgb_sel_tab[PIN_OUTPUT_SEL_COUNT] = {
183 static void rgb_enable(struct dc_com_reg *com)
187 for (i = 0; i < PIN_REG_COUNT; i++) {
188 writel(rgb_enb_tab[i], &com->pin_output_enb[i]);
189 writel(rgb_polarity_tab[i], &com->pin_output_polarity[i]);
190 writel(rgb_data_tab[i], &com->pin_output_data[i]);
193 for (i = 0; i < PIN_OUTPUT_SEL_COUNT; i++)
194 writel(rgb_sel_tab[i], &com->pin_output_sel[i]);
197 int setup_window(struct disp_ctl_win *win, struct fdt_disp_config *config)
201 win->w = config->width;
202 win->h = config->height;
205 win->out_w = config->width;
206 win->out_h = config->height;
207 win->phys_addr = config->frame_buffer;
208 win->stride = config->width * (1 << config->log2_bpp) / 8;
209 debug("%s: depth = %d\n", __func__, config->log2_bpp);
210 switch (config->log2_bpp) {
213 win->fmt = COLOR_DEPTH_R8G8B8A8;
217 win->fmt = COLOR_DEPTH_B5G6R5;
222 debug("Unsupported LCD bit depth");
229 struct fdt_disp_config *tegra_display_get_config(void)
231 return config.valid ? &config : NULL;
234 static void debug_timing(const char *name, unsigned int timing[])
239 debug("%s timing: ", name);
240 for (i = 0; i < FDT_LCD_TIMING_COUNT; i++)
241 debug("%d ", timing[i]);
247 * Decode panel information from the fdt, according to a standard binding
249 * @param blob fdt blob
250 * @param node offset of fdt node to read from
251 * @param config structure to store fdt config into
252 * @return 0 if ok, -ve on error
254 static int tegra_decode_panel(const void *blob, int node,
255 struct fdt_disp_config *config)
257 int front, back, ref;
259 config->width = fdtdec_get_int(blob, node, "xres", -1);
260 config->height = fdtdec_get_int(blob, node, "yres", -1);
261 config->pixel_clock = fdtdec_get_int(blob, node, "clock", 0);
262 if (!config->pixel_clock || config->width == -1 ||
263 config->height == -1) {
264 debug("%s: Pixel parameters missing\n", __func__);
265 return -FDT_ERR_NOTFOUND;
268 back = fdtdec_get_int(blob, node, "left-margin", -1);
269 front = fdtdec_get_int(blob, node, "right-margin", -1);
270 ref = fdtdec_get_int(blob, node, "hsync-len", -1);
271 if ((back | front | ref) == -1) {
272 debug("%s: Horizontal parameters missing\n", __func__);
273 return -FDT_ERR_NOTFOUND;
276 /* Use a ref-to-sync of 1 always, and take this from the front porch */
277 config->horiz_timing[FDT_LCD_TIMING_REF_TO_SYNC] = 1;
278 config->horiz_timing[FDT_LCD_TIMING_SYNC_WIDTH] = ref;
279 config->horiz_timing[FDT_LCD_TIMING_BACK_PORCH] = back;
280 config->horiz_timing[FDT_LCD_TIMING_FRONT_PORCH] = front -
281 config->horiz_timing[FDT_LCD_TIMING_REF_TO_SYNC];
282 debug_timing("horiz", config->horiz_timing);
284 back = fdtdec_get_int(blob, node, "upper-margin", -1);
285 front = fdtdec_get_int(blob, node, "lower-margin", -1);
286 ref = fdtdec_get_int(blob, node, "vsync-len", -1);
287 if ((back | front | ref) == -1) {
288 debug("%s: Vertical parameters missing\n", __func__);
289 return -FDT_ERR_NOTFOUND;
292 config->vert_timing[FDT_LCD_TIMING_REF_TO_SYNC] = 1;
293 config->vert_timing[FDT_LCD_TIMING_SYNC_WIDTH] = ref;
294 config->vert_timing[FDT_LCD_TIMING_BACK_PORCH] = back;
295 config->vert_timing[FDT_LCD_TIMING_FRONT_PORCH] = front -
296 config->vert_timing[FDT_LCD_TIMING_REF_TO_SYNC];
297 debug_timing("vert", config->vert_timing);
303 * Decode the display controller information from the fdt.
305 * @param blob fdt blob
306 * @param config structure to store fdt config into
307 * @return 0 if ok, -ve on error
309 static int tegra_display_decode_config(const void *blob,
310 struct fdt_disp_config *config)
315 /* TODO: Support multiple controllers */
316 node = fdtdec_next_compatible(blob, 0, COMPAT_NVIDIA_TEGRA20_DC);
318 debug("%s: Cannot find display controller node in fdt\n",
322 config->disp = (struct disp_ctlr *)fdtdec_get_addr(blob, node, "reg");
324 debug("%s: No display controller address\n", __func__);
328 rgb = fdt_subnode_offset(blob, node, "rgb");
330 config->panel_node = fdtdec_lookup_phandle(blob, rgb, "nvidia,panel");
331 if (!config->panel_node < 0) {
332 debug("%s: Cannot find panel information\n", __func__);
336 if (tegra_decode_panel(blob, config->panel_node, config)) {
337 debug("%s: Failed to decode panel information\n", __func__);
341 bpp = fdtdec_get_int(blob, config->panel_node, "nvidia,bits-per-pixel",
344 if (bpp == (1 << bit))
345 config->log2_bpp = bit;
347 config->log2_bpp = bpp;
349 debug("%s: Pixel bpp parameters missing\n", __func__);
350 return -FDT_ERR_NOTFOUND;
354 config->valid = 1; /* we have a valid configuration */
359 int tegra_display_probe(const void *blob, void *default_lcd_base)
361 struct disp_ctl_win window;
364 if (tegra_display_decode_config(blob, &config))
367 config.frame_buffer = (u32)default_lcd_base;
369 dc = (struct dc_ctlr *)config.disp;
372 * A header file for clock constants was NAKed upstream.
373 * TODO: Put this into the FDT and fdt_lcd struct when we have clock
376 clock_start_periph_pll(PERIPH_ID_HOST1X, CLOCK_ID_PERIPH,
378 clock_start_periph_pll(PERIPH_ID_DISP1, CLOCK_ID_CGENERAL,
380 basic_init(&dc->cmd);
381 basic_init_timer(&dc->disp);
382 rgb_enable(&dc->com);
384 if (config.pixel_clock)
385 update_display_mode(&dc->disp, &config);
387 if (setup_window(&window, &config))
390 update_window(dc, &window);