1 /* 2 * OMAP2plus display device setup / initialization. 3 * 4 * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/ 5 * Senthilvadivu Guruswamy 6 * Sumit Semwal 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 13 * kind, whether express or implied; without even the implied warranty 14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/string.h> 19 #include <linux/kernel.h> 20 #include <linux/init.h> 21 #include <linux/platform_device.h> 22 #include <linux/io.h> 23 #include <linux/clk.h> 24 #include <linux/err.h> 25 #include <linux/delay.h> 26 #include <linux/of.h> 27 #include <linux/of_platform.h> 28 #include <linux/slab.h> 29 #include <linux/mfd/syscon.h> 30 #include <linux/regmap.h> 31 32 #include <linux/platform_data/omapdss.h> 33 #include "omap_hwmod.h" 34 #include "omap_device.h" 35 #include "common.h" 36 37 #include "soc.h" 38 #include "iomap.h" 39 #include "control.h" 40 #include "display.h" 41 #include "prm.h" 42 43 #define DISPC_CONTROL 0x0040 44 #define DISPC_CONTROL2 0x0238 45 #define DISPC_CONTROL3 0x0848 46 #define DISPC_IRQSTATUS 0x0018 47 48 #define DSS_CONTROL 0x40 49 #define DSS_SDI_CONTROL 0x44 50 #define DSS_PLL_CONTROL 0x48 51 52 #define LCD_EN_MASK (0x1 << 0) 53 #define DIGIT_EN_MASK (0x1 << 1) 54 55 #define FRAMEDONE_IRQ_SHIFT 0 56 #define EVSYNC_EVEN_IRQ_SHIFT 2 57 #define EVSYNC_ODD_IRQ_SHIFT 3 58 #define FRAMEDONE2_IRQ_SHIFT 22 59 #define FRAMEDONE3_IRQ_SHIFT 30 60 #define FRAMEDONETV_IRQ_SHIFT 24 61 62 /* 63 * FRAMEDONE_IRQ_TIMEOUT: how long (in milliseconds) to wait during DISPC 64 * reset before deciding that something has gone wrong 65 */ 66 #define FRAMEDONE_IRQ_TIMEOUT 100 67 68 #if defined(CONFIG_FB_OMAP2) 69 static struct platform_device omap_display_device = { 70 .name = "omapdss", 71 .id = -1, 72 .dev = { 73 .platform_data = NULL, 74 }, 75 }; 76 77 #define OMAP4_DSIPHY_SYSCON_OFFSET 0x78 78 79 static struct regmap *omap4_dsi_mux_syscon; 80 81 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes) 82 { 83 u32 enable_mask, enable_shift; 84 u32 pipd_mask, pipd_shift; 85 u32 reg; 86 int ret; 87 88 if (dsi_id == 0) { 89 enable_mask = OMAP4_DSI1_LANEENABLE_MASK; 90 enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT; 91 pipd_mask = OMAP4_DSI1_PIPD_MASK; 92 pipd_shift = OMAP4_DSI1_PIPD_SHIFT; 93 } else if (dsi_id == 1) { 94 enable_mask = OMAP4_DSI2_LANEENABLE_MASK; 95 enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT; 96 pipd_mask = OMAP4_DSI2_PIPD_MASK; 97 pipd_shift = OMAP4_DSI2_PIPD_SHIFT; 98 } else { 99 return -ENODEV; 100 } 101 102 ret = regmap_read(omap4_dsi_mux_syscon, 103 OMAP4_DSIPHY_SYSCON_OFFSET, 104 ®); 105 if (ret) 106 return ret; 107 108 reg &= ~enable_mask; 109 reg &= ~pipd_mask; 110 111 reg |= (lanes << enable_shift) & enable_mask; 112 reg |= (lanes << pipd_shift) & pipd_mask; 113 114 regmap_write(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, reg); 115 116 return 0; 117 } 118 119 static int omap_dsi_enable_pads(int dsi_id, unsigned lane_mask) 120 { 121 if (cpu_is_omap44xx()) 122 return omap4_dsi_mux_pads(dsi_id, lane_mask); 123 124 return 0; 125 } 126 127 static void omap_dsi_disable_pads(int dsi_id, unsigned lane_mask) 128 { 129 if (cpu_is_omap44xx()) 130 omap4_dsi_mux_pads(dsi_id, 0); 131 } 132 133 static enum omapdss_version __init omap_display_get_version(void) 134 { 135 if (cpu_is_omap24xx()) 136 return OMAPDSS_VER_OMAP24xx; 137 else if (cpu_is_omap3630()) 138 return OMAPDSS_VER_OMAP3630; 139 else if (cpu_is_omap34xx()) { 140 if (soc_is_am35xx()) { 141 return OMAPDSS_VER_AM35xx; 142 } else { 143 if (omap_rev() < OMAP3430_REV_ES3_0) 144 return OMAPDSS_VER_OMAP34xx_ES1; 145 else 146 return OMAPDSS_VER_OMAP34xx_ES3; 147 } 148 } else if (omap_rev() == OMAP4430_REV_ES1_0) 149 return OMAPDSS_VER_OMAP4430_ES1; 150 else if (omap_rev() == OMAP4430_REV_ES2_0 || 151 omap_rev() == OMAP4430_REV_ES2_1 || 152 omap_rev() == OMAP4430_REV_ES2_2) 153 return OMAPDSS_VER_OMAP4430_ES2; 154 else if (cpu_is_omap44xx()) 155 return OMAPDSS_VER_OMAP4; 156 else if (soc_is_omap54xx()) 157 return OMAPDSS_VER_OMAP5; 158 else if (soc_is_am43xx()) 159 return OMAPDSS_VER_AM43xx; 160 else if (soc_is_dra7xx()) 161 return OMAPDSS_VER_DRA7xx; 162 else 163 return OMAPDSS_VER_UNKNOWN; 164 } 165 166 static int __init omapdss_init_fbdev(void) 167 { 168 static struct omap_dss_board_info board_data = { 169 .dsi_enable_pads = omap_dsi_enable_pads, 170 .dsi_disable_pads = omap_dsi_disable_pads, 171 }; 172 struct device_node *node; 173 int r; 174 175 board_data.version = omap_display_get_version(); 176 if (board_data.version == OMAPDSS_VER_UNKNOWN) { 177 pr_err("DSS not supported on this SoC\n"); 178 return -ENODEV; 179 } 180 181 omap_display_device.dev.platform_data = &board_data; 182 183 r = platform_device_register(&omap_display_device); 184 if (r < 0) { 185 pr_err("Unable to register omapdss device\n"); 186 return r; 187 } 188 189 /* create vrfb device */ 190 r = omap_init_vrfb(); 191 if (r < 0) { 192 pr_err("Unable to register omapvrfb device\n"); 193 return r; 194 } 195 196 /* create FB device */ 197 r = omap_init_fb(); 198 if (r < 0) { 199 pr_err("Unable to register omapfb device\n"); 200 return r; 201 } 202 203 /* create V4L2 display device */ 204 r = omap_init_vout(); 205 if (r < 0) { 206 pr_err("Unable to register omap_vout device\n"); 207 return r; 208 } 209 210 /* add DSI info for omap4 */ 211 node = of_find_node_by_name(NULL, "omap4_padconf_global"); 212 if (node) 213 omap4_dsi_mux_syscon = syscon_node_to_regmap(node); 214 215 return 0; 216 } 217 218 static const char * const omapdss_compat_names[] __initconst = { 219 "ti,omap2-dss", 220 "ti,omap3-dss", 221 "ti,omap4-dss", 222 "ti,omap5-dss", 223 "ti,dra7-dss", 224 }; 225 226 static struct device_node * __init omapdss_find_dss_of_node(void) 227 { 228 struct device_node *node; 229 int i; 230 231 for (i = 0; i < ARRAY_SIZE(omapdss_compat_names); ++i) { 232 node = of_find_compatible_node(NULL, NULL, 233 omapdss_compat_names[i]); 234 if (node) 235 return node; 236 } 237 238 return NULL; 239 } 240 241 static int __init omapdss_init_of(void) 242 { 243 int r; 244 struct device_node *node; 245 struct platform_device *pdev; 246 247 /* only create dss helper devices if dss is enabled in the .dts */ 248 249 node = omapdss_find_dss_of_node(); 250 if (!node) 251 return 0; 252 253 if (!of_device_is_available(node)) { 254 of_node_put(node); 255 return 0; 256 } 257 258 pdev = of_find_device_by_node(node); 259 260 if (!pdev) { 261 pr_err("Unable to find DSS platform device\n"); 262 return -ENODEV; 263 } 264 265 r = of_platform_populate(node, NULL, NULL, &pdev->dev); 266 put_device(&pdev->dev); 267 if (r) { 268 pr_err("Unable to populate DSS submodule devices\n"); 269 return r; 270 } 271 272 return omapdss_init_fbdev(); 273 } 274 omap_device_initcall(omapdss_init_of); 275 #endif /* CONFIG_FB_OMAP2 */ 276 277 static void dispc_disable_outputs(void) 278 { 279 u32 v, irq_mask = 0; 280 bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false; 281 int i; 282 struct omap_dss_dispc_dev_attr *da; 283 struct omap_hwmod *oh; 284 285 oh = omap_hwmod_lookup("dss_dispc"); 286 if (!oh) { 287 WARN(1, "display: could not disable outputs during reset - could not find dss_dispc hwmod\n"); 288 return; 289 } 290 291 if (!oh->dev_attr) { 292 pr_err("display: could not disable outputs during reset due to missing dev_attr\n"); 293 return; 294 } 295 296 da = (struct omap_dss_dispc_dev_attr *)oh->dev_attr; 297 298 /* store value of LCDENABLE and DIGITENABLE bits */ 299 v = omap_hwmod_read(oh, DISPC_CONTROL); 300 lcd_en = v & LCD_EN_MASK; 301 digit_en = v & DIGIT_EN_MASK; 302 303 /* store value of LCDENABLE for LCD2 */ 304 if (da->manager_count > 2) { 305 v = omap_hwmod_read(oh, DISPC_CONTROL2); 306 lcd2_en = v & LCD_EN_MASK; 307 } 308 309 /* store value of LCDENABLE for LCD3 */ 310 if (da->manager_count > 3) { 311 v = omap_hwmod_read(oh, DISPC_CONTROL3); 312 lcd3_en = v & LCD_EN_MASK; 313 } 314 315 if (!(lcd_en | digit_en | lcd2_en | lcd3_en)) 316 return; /* no managers currently enabled */ 317 318 /* 319 * If any manager was enabled, we need to disable it before 320 * DSS clocks are disabled or DISPC module is reset 321 */ 322 if (lcd_en) 323 irq_mask |= 1 << FRAMEDONE_IRQ_SHIFT; 324 325 if (digit_en) { 326 if (da->has_framedonetv_irq) { 327 irq_mask |= 1 << FRAMEDONETV_IRQ_SHIFT; 328 } else { 329 irq_mask |= 1 << EVSYNC_EVEN_IRQ_SHIFT | 330 1 << EVSYNC_ODD_IRQ_SHIFT; 331 } 332 } 333 334 if (lcd2_en) 335 irq_mask |= 1 << FRAMEDONE2_IRQ_SHIFT; 336 if (lcd3_en) 337 irq_mask |= 1 << FRAMEDONE3_IRQ_SHIFT; 338 339 /* 340 * clear any previous FRAMEDONE, FRAMEDONETV, 341 * EVSYNC_EVEN/ODD, FRAMEDONE2 or FRAMEDONE3 interrupts 342 */ 343 omap_hwmod_write(irq_mask, oh, DISPC_IRQSTATUS); 344 345 /* disable LCD and TV managers */ 346 v = omap_hwmod_read(oh, DISPC_CONTROL); 347 v &= ~(LCD_EN_MASK | DIGIT_EN_MASK); 348 omap_hwmod_write(v, oh, DISPC_CONTROL); 349 350 /* disable LCD2 manager */ 351 if (da->manager_count > 2) { 352 v = omap_hwmod_read(oh, DISPC_CONTROL2); 353 v &= ~LCD_EN_MASK; 354 omap_hwmod_write(v, oh, DISPC_CONTROL2); 355 } 356 357 /* disable LCD3 manager */ 358 if (da->manager_count > 3) { 359 v = omap_hwmod_read(oh, DISPC_CONTROL3); 360 v &= ~LCD_EN_MASK; 361 omap_hwmod_write(v, oh, DISPC_CONTROL3); 362 } 363 364 i = 0; 365 while ((omap_hwmod_read(oh, DISPC_IRQSTATUS) & irq_mask) != 366 irq_mask) { 367 i++; 368 if (i > FRAMEDONE_IRQ_TIMEOUT) { 369 pr_err("didn't get FRAMEDONE1/2/3 or TV interrupt\n"); 370 break; 371 } 372 mdelay(1); 373 } 374 } 375 376 int omap_dss_reset(struct omap_hwmod *oh) 377 { 378 struct omap_hwmod_opt_clk *oc; 379 int c = 0; 380 int i, r; 381 382 if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) { 383 pr_err("dss_core: hwmod data doesn't contain reset data\n"); 384 return -EINVAL; 385 } 386 387 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) 388 clk_prepare_enable(oc->_clk); 389 390 dispc_disable_outputs(); 391 392 /* clear SDI registers */ 393 if (cpu_is_omap3430()) { 394 omap_hwmod_write(0x0, oh, DSS_SDI_CONTROL); 395 omap_hwmod_write(0x0, oh, DSS_PLL_CONTROL); 396 } 397 398 /* 399 * clear DSS_CONTROL register to switch DSS clock sources to 400 * PRCM clock, if any 401 */ 402 omap_hwmod_write(0x0, oh, DSS_CONTROL); 403 404 omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs) 405 & SYSS_RESETDONE_MASK), 406 MAX_MODULE_SOFTRESET_WAIT, c); 407 408 if (c == MAX_MODULE_SOFTRESET_WAIT) 409 pr_warn("dss_core: waiting for reset to finish failed\n"); 410 else 411 pr_debug("dss_core: softreset done\n"); 412 413 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) 414 clk_disable_unprepare(oc->_clk); 415 416 r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0; 417 418 return r; 419 } 420