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0be8f203 SG |
1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. | |
3 | * See file CREDITS for list of people who contributed to this | |
4 | * project. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of | |
9 | * the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
19 | * MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <common.h> | |
23 | #include <fdtdec.h> | |
24 | #include <lcd.h> | |
25 | ||
26 | #include <asm/system.h> | |
27 | #include <asm/gpio.h> | |
28 | ||
29 | #include <asm/arch/clock.h> | |
30 | #include <asm/arch/funcmux.h> | |
31 | #include <asm/arch/pinmux.h> | |
32 | #include <asm/arch/pwm.h> | |
33 | #include <asm/arch/display.h> | |
34 | #include <asm/arch-tegra/timer.h> | |
35 | ||
36 | DECLARE_GLOBAL_DATA_PTR; | |
37 | ||
38 | /* These are the stages we go throuh in enabling the LCD */ | |
39 | enum stage_t { | |
40 | STAGE_START, | |
41 | STAGE_PANEL_VDD, | |
42 | STAGE_LVDS, | |
43 | STAGE_BACKLIGHT_VDD, | |
44 | STAGE_PWM, | |
45 | STAGE_BACKLIGHT_EN, | |
46 | STAGE_DONE, | |
47 | }; | |
48 | ||
49 | static enum stage_t stage; /* Current stage we are at */ | |
50 | static unsigned long timer_next; /* Time we can move onto next stage */ | |
51 | ||
52 | /* Our LCD config, set up in handle_stage() */ | |
53 | static struct fdt_panel_config config; | |
54 | struct fdt_disp_config *disp_config; /* Display controller config */ | |
55 | ||
56 | enum { | |
57 | /* Maximum LCD size we support */ | |
58 | LCD_MAX_WIDTH = 1366, | |
59 | LCD_MAX_HEIGHT = 768, | |
60 | LCD_MAX_LOG2_BPP = 4, /* 2^4 = 16 bpp */ | |
61 | }; | |
62 | ||
63 | int lcd_line_length; | |
64 | int lcd_color_fg; | |
65 | int lcd_color_bg; | |
66 | ||
67 | void *lcd_base; /* Start of framebuffer memory */ | |
68 | void *lcd_console_address; /* Start of console buffer */ | |
69 | ||
70 | short console_col; | |
71 | short console_row; | |
72 | ||
73 | vidinfo_t panel_info = { | |
74 | /* Insert a value here so that we don't end up in the BSS */ | |
75 | .vl_col = -1, | |
76 | }; | |
77 | ||
78 | char lcd_cursor_enabled; | |
79 | ||
80 | ushort lcd_cursor_width; | |
81 | ushort lcd_cursor_height; | |
82 | ||
83 | #ifndef CONFIG_OF_CONTROL | |
84 | #error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support" | |
85 | #endif | |
86 | ||
87 | void lcd_cursor_size(ushort width, ushort height) | |
88 | { | |
89 | lcd_cursor_width = width; | |
90 | lcd_cursor_height = height; | |
91 | } | |
92 | ||
93 | void lcd_toggle_cursor(void) | |
94 | { | |
95 | ushort x, y; | |
96 | uchar *dest; | |
97 | ushort row; | |
98 | ||
99 | x = console_col * lcd_cursor_width; | |
100 | y = console_row * lcd_cursor_height; | |
101 | dest = (uchar *)(lcd_base + y * lcd_line_length + x * (1 << LCD_BPP) / | |
102 | 8); | |
103 | ||
104 | for (row = 0; row < lcd_cursor_height; ++row, dest += lcd_line_length) { | |
105 | ushort *d = (ushort *)dest; | |
106 | ushort color; | |
107 | int i; | |
108 | ||
109 | for (i = 0; i < lcd_cursor_width; ++i) { | |
110 | color = *d; | |
111 | color ^= lcd_color_fg; | |
112 | *d = color; | |
113 | ++d; | |
114 | } | |
115 | } | |
116 | } | |
117 | ||
118 | void lcd_cursor_on(void) | |
119 | { | |
120 | lcd_cursor_enabled = 1; | |
121 | lcd_toggle_cursor(); | |
122 | } | |
123 | void lcd_cursor_off(void) | |
124 | { | |
125 | lcd_cursor_enabled = 0; | |
126 | lcd_toggle_cursor(); | |
127 | } | |
128 | ||
129 | char lcd_is_cursor_enabled(void) | |
130 | { | |
131 | return lcd_cursor_enabled; | |
132 | } | |
133 | ||
134 | static void update_panel_size(struct fdt_disp_config *config) | |
135 | { | |
136 | panel_info.vl_col = config->width; | |
137 | panel_info.vl_row = config->height; | |
138 | panel_info.vl_bpix = config->log2_bpp; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Main init function called by lcd driver. | |
143 | * Inits and then prints test pattern if required. | |
144 | */ | |
145 | ||
146 | void lcd_ctrl_init(void *lcdbase) | |
147 | { | |
44706a87 | 148 | int type = DCACHE_OFF; |
0c558754 | 149 | int size; |
0be8f203 SG |
150 | |
151 | assert(disp_config); | |
152 | ||
153 | lcd_base = (void *)disp_config->frame_buffer; | |
154 | ||
155 | /* Make sure that we can acommodate the selected LCD */ | |
156 | assert(disp_config->width <= LCD_MAX_WIDTH); | |
157 | assert(disp_config->height <= LCD_MAX_HEIGHT); | |
158 | assert(disp_config->log2_bpp <= LCD_MAX_LOG2_BPP); | |
159 | if (disp_config->width <= LCD_MAX_WIDTH | |
160 | && disp_config->height <= LCD_MAX_HEIGHT | |
161 | && disp_config->log2_bpp <= LCD_MAX_LOG2_BPP) | |
162 | update_panel_size(disp_config); | |
0c558754 | 163 | size = lcd_get_size(&lcd_line_length); |
0be8f203 | 164 | |
44706a87 SG |
165 | /* Set up the LCD caching as requested */ |
166 | if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH) | |
167 | type = DCACHE_WRITETHROUGH; | |
168 | else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK) | |
169 | type = DCACHE_WRITEBACK; | |
170 | mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type); | |
171 | ||
172 | /* Enable flushing after LCD writes if requested */ | |
173 | lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH); | |
174 | ||
0be8f203 SG |
175 | debug("LCD frame buffer at %p\n", lcd_base); |
176 | } | |
177 | ||
178 | ulong calc_fbsize(void) | |
179 | { | |
180 | return (panel_info.vl_col * panel_info.vl_row * | |
181 | NBITS(panel_info.vl_bpix)) / 8; | |
182 | } | |
183 | ||
184 | void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) | |
185 | { | |
186 | } | |
187 | ||
188 | void tegra_lcd_early_init(const void *blob) | |
189 | { | |
190 | /* | |
191 | * Go with the maximum size for now. We will fix this up after | |
192 | * relocation. These values are only used for memory alocation. | |
193 | */ | |
194 | panel_info.vl_col = LCD_MAX_WIDTH; | |
195 | panel_info.vl_row = LCD_MAX_HEIGHT; | |
196 | panel_info.vl_bpix = LCD_MAX_LOG2_BPP; | |
197 | } | |
198 | ||
199 | /** | |
200 | * Decode the panel information from the fdt. | |
201 | * | |
202 | * @param blob fdt blob | |
203 | * @param config structure to store fdt config into | |
204 | * @return 0 if ok, -ve on error | |
205 | */ | |
206 | static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config) | |
207 | { | |
208 | int display_node; | |
209 | ||
210 | disp_config = tegra_display_get_config(); | |
211 | if (!disp_config) { | |
212 | debug("%s: Display controller is not configured\n", __func__); | |
213 | return -1; | |
214 | } | |
215 | display_node = disp_config->panel_node; | |
216 | if (display_node < 0) { | |
217 | debug("%s: No panel configuration available\n", __func__); | |
218 | return -1; | |
219 | } | |
220 | ||
221 | config->pwm_channel = pwm_request(blob, display_node, "nvidia,pwm"); | |
222 | if (config->pwm_channel < 0) { | |
223 | debug("%s: Unable to request PWM channel\n", __func__); | |
224 | return -1; | |
225 | } | |
226 | ||
227 | config->cache_type = fdtdec_get_int(blob, display_node, | |
228 | "nvidia,cache-type", | |
229 | FDT_LCD_CACHE_WRITE_BACK_FLUSH); | |
230 | ||
231 | /* These GPIOs are all optional */ | |
232 | fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-enable-gpios", | |
233 | &config->backlight_en); | |
234 | fdtdec_decode_gpio(blob, display_node, "nvidia,lvds-shutdown-gpios", | |
235 | &config->lvds_shutdown); | |
236 | fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-vdd-gpios", | |
237 | &config->backlight_vdd); | |
238 | fdtdec_decode_gpio(blob, display_node, "nvidia,panel-vdd-gpios", | |
239 | &config->panel_vdd); | |
240 | ||
241 | return fdtdec_get_int_array(blob, display_node, "nvidia,panel-timings", | |
242 | config->panel_timings, FDT_LCD_TIMINGS); | |
243 | } | |
244 | ||
245 | /** | |
246 | * Handle the next stage of device init | |
247 | */ | |
248 | static int handle_stage(const void *blob) | |
249 | { | |
250 | debug("%s: stage %d\n", __func__, stage); | |
251 | ||
252 | /* do the things for this stage */ | |
253 | switch (stage) { | |
254 | case STAGE_START: | |
255 | /* Initialize the Tegra display controller */ | |
256 | if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) { | |
257 | printf("%s: Failed to probe display driver\n", | |
258 | __func__); | |
259 | return -1; | |
260 | } | |
261 | ||
262 | /* get panel details */ | |
263 | if (fdt_decode_lcd(blob, &config)) { | |
264 | printf("No valid LCD information in device tree\n"); | |
265 | return -1; | |
266 | } | |
267 | ||
268 | /* | |
269 | * It is possible that the FDT has requested that the LCD be | |
270 | * disabled. We currently don't support this. It would require | |
271 | * changes to U-Boot LCD subsystem to have LCD support | |
272 | * compiled in but not used. An easier option might be to | |
273 | * still have a frame buffer, but leave the backlight off and | |
274 | * remove all mention of lcd in the stdout environment | |
275 | * variable. | |
276 | */ | |
277 | ||
278 | funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT); | |
279 | ||
280 | fdtdec_setup_gpio(&config.panel_vdd); | |
281 | fdtdec_setup_gpio(&config.lvds_shutdown); | |
282 | fdtdec_setup_gpio(&config.backlight_vdd); | |
283 | fdtdec_setup_gpio(&config.backlight_en); | |
284 | ||
285 | /* | |
286 | * TODO: If fdt includes output flag we can omit this code | |
287 | * since fdtdec_setup_gpio will do it for us. | |
288 | */ | |
289 | if (fdt_gpio_isvalid(&config.panel_vdd)) | |
290 | gpio_direction_output(config.panel_vdd.gpio, 0); | |
291 | if (fdt_gpio_isvalid(&config.lvds_shutdown)) | |
292 | gpio_direction_output(config.lvds_shutdown.gpio, 0); | |
293 | if (fdt_gpio_isvalid(&config.backlight_vdd)) | |
294 | gpio_direction_output(config.backlight_vdd.gpio, 0); | |
295 | if (fdt_gpio_isvalid(&config.backlight_en)) | |
296 | gpio_direction_output(config.backlight_en.gpio, 0); | |
297 | break; | |
298 | case STAGE_PANEL_VDD: | |
299 | if (fdt_gpio_isvalid(&config.panel_vdd)) | |
300 | gpio_direction_output(config.panel_vdd.gpio, 1); | |
301 | break; | |
302 | case STAGE_LVDS: | |
303 | if (fdt_gpio_isvalid(&config.lvds_shutdown)) | |
304 | gpio_set_value(config.lvds_shutdown.gpio, 1); | |
305 | break; | |
306 | case STAGE_BACKLIGHT_VDD: | |
307 | if (fdt_gpio_isvalid(&config.backlight_vdd)) | |
308 | gpio_set_value(config.backlight_vdd.gpio, 1); | |
309 | break; | |
310 | case STAGE_PWM: | |
311 | /* Enable PWM at 15/16 high, 32768 Hz with divider 1 */ | |
312 | pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM); | |
313 | pinmux_tristate_disable(PINGRP_GPU); | |
314 | ||
315 | pwm_enable(config.pwm_channel, 32768, 0xdf, 1); | |
316 | break; | |
317 | case STAGE_BACKLIGHT_EN: | |
318 | if (fdt_gpio_isvalid(&config.backlight_en)) | |
319 | gpio_set_value(config.backlight_en.gpio, 1); | |
320 | break; | |
321 | case STAGE_DONE: | |
322 | break; | |
323 | } | |
324 | ||
325 | /* set up timer for next stage */ | |
326 | timer_next = timer_get_us(); | |
327 | if (stage < FDT_LCD_TIMINGS) | |
328 | timer_next += config.panel_timings[stage] * 1000; | |
329 | ||
330 | /* move to next stage */ | |
331 | stage++; | |
332 | return 0; | |
333 | } | |
334 | ||
335 | int tegra_lcd_check_next_stage(const void *blob, int wait) | |
336 | { | |
337 | if (stage == STAGE_DONE) | |
338 | return 0; | |
339 | ||
340 | do { | |
341 | /* wait if we need to */ | |
342 | debug("%s: stage %d\n", __func__, stage); | |
343 | if (stage != STAGE_START) { | |
344 | int delay = timer_next - timer_get_us(); | |
345 | ||
346 | if (delay > 0) { | |
347 | if (wait) | |
348 | udelay(delay); | |
349 | else | |
350 | return 0; | |
351 | } | |
352 | } | |
353 | ||
354 | if (handle_stage(blob)) | |
355 | return -1; | |
356 | } while (wait && stage != STAGE_DONE); | |
357 | if (stage == STAGE_DONE) | |
358 | debug("%s: LCD init complete\n", __func__); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | void lcd_enable(void) | |
364 | { | |
365 | /* | |
366 | * Backlight and power init will be done separately in | |
367 | * tegra_lcd_check_next_stage(), which should be called in | |
368 | * board_late_init(). | |
369 | * | |
370 | * U-Boot code supports only colour depth, selected at compile time. | |
371 | * The device tree setting should match this. Otherwise the display | |
372 | * will not look right, and U-Boot may crash. | |
373 | */ | |
374 | if (disp_config->log2_bpp != LCD_BPP) { | |
375 | printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)" | |
376 | " must match setting of LCD_BPP (%d)\n", __func__, | |
377 | disp_config->log2_bpp, disp_config->bpp, LCD_BPP); | |
378 | } | |
379 | } |