Hai Li | 5c82902 | 2015-08-13 17:45:52 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/platform_device.h> |
| 15 | |
| 16 | #include "dsi_phy.h" |
| 17 | |
| 18 | #define S_DIV_ROUND_UP(n, d) \ |
| 19 | (((n) >= 0) ? (((n) + (d) - 1) / (d)) : (((n) - (d) + 1) / (d))) |
| 20 | |
| 21 | static inline s32 linear_inter(s32 tmax, s32 tmin, s32 percent, |
| 22 | s32 min_result, bool even) |
| 23 | { |
| 24 | s32 v; |
| 25 | |
| 26 | v = (tmax - tmin) * percent; |
| 27 | v = S_DIV_ROUND_UP(v, 100) + tmin; |
| 28 | if (even && (v & 0x1)) |
| 29 | return max_t(s32, min_result, v - 1); |
| 30 | else |
| 31 | return max_t(s32, min_result, v); |
| 32 | } |
| 33 | |
| 34 | static void dsi_dphy_timing_calc_clk_zero(struct msm_dsi_dphy_timing *timing, |
| 35 | s32 ui, s32 coeff, s32 pcnt) |
| 36 | { |
| 37 | s32 tmax, tmin, clk_z; |
| 38 | s32 temp; |
| 39 | |
| 40 | /* reset */ |
| 41 | temp = 300 * coeff - ((timing->clk_prepare >> 1) + 1) * 2 * ui; |
| 42 | tmin = S_DIV_ROUND_UP(temp, ui) - 2; |
| 43 | if (tmin > 255) { |
| 44 | tmax = 511; |
| 45 | clk_z = linear_inter(2 * tmin, tmin, pcnt, 0, true); |
| 46 | } else { |
| 47 | tmax = 255; |
| 48 | clk_z = linear_inter(tmax, tmin, pcnt, 0, true); |
| 49 | } |
| 50 | |
| 51 | /* adjust */ |
| 52 | temp = (timing->hs_rqst + timing->clk_prepare + clk_z) & 0x7; |
| 53 | timing->clk_zero = clk_z + 8 - temp; |
| 54 | } |
| 55 | |
| 56 | int msm_dsi_dphy_timing_calc(struct msm_dsi_dphy_timing *timing, |
| 57 | const unsigned long bit_rate, const unsigned long esc_rate) |
| 58 | { |
| 59 | s32 ui, lpx; |
| 60 | s32 tmax, tmin; |
| 61 | s32 pcnt0 = 10; |
| 62 | s32 pcnt1 = (bit_rate > 1200000000) ? 15 : 10; |
| 63 | s32 pcnt2 = 10; |
| 64 | s32 pcnt3 = (bit_rate > 180000000) ? 10 : 40; |
| 65 | s32 coeff = 1000; /* Precision, should avoid overflow */ |
| 66 | s32 temp; |
| 67 | |
| 68 | if (!bit_rate || !esc_rate) |
| 69 | return -EINVAL; |
| 70 | |
| 71 | ui = mult_frac(NSEC_PER_MSEC, coeff, bit_rate / 1000); |
| 72 | lpx = mult_frac(NSEC_PER_MSEC, coeff, esc_rate / 1000); |
| 73 | |
| 74 | tmax = S_DIV_ROUND_UP(95 * coeff, ui) - 2; |
| 75 | tmin = S_DIV_ROUND_UP(38 * coeff, ui) - 2; |
| 76 | timing->clk_prepare = linear_inter(tmax, tmin, pcnt0, 0, true); |
| 77 | |
| 78 | temp = lpx / ui; |
| 79 | if (temp & 0x1) |
| 80 | timing->hs_rqst = temp; |
| 81 | else |
| 82 | timing->hs_rqst = max_t(s32, 0, temp - 2); |
| 83 | |
| 84 | /* Calculate clk_zero after clk_prepare and hs_rqst */ |
| 85 | dsi_dphy_timing_calc_clk_zero(timing, ui, coeff, pcnt2); |
| 86 | |
| 87 | temp = 105 * coeff + 12 * ui - 20 * coeff; |
| 88 | tmax = S_DIV_ROUND_UP(temp, ui) - 2; |
| 89 | tmin = S_DIV_ROUND_UP(60 * coeff, ui) - 2; |
| 90 | timing->clk_trail = linear_inter(tmax, tmin, pcnt3, 0, true); |
| 91 | |
| 92 | temp = 85 * coeff + 6 * ui; |
| 93 | tmax = S_DIV_ROUND_UP(temp, ui) - 2; |
| 94 | temp = 40 * coeff + 4 * ui; |
| 95 | tmin = S_DIV_ROUND_UP(temp, ui) - 2; |
| 96 | timing->hs_prepare = linear_inter(tmax, tmin, pcnt1, 0, true); |
| 97 | |
| 98 | tmax = 255; |
| 99 | temp = ((timing->hs_prepare >> 1) + 1) * 2 * ui + 2 * ui; |
| 100 | temp = 145 * coeff + 10 * ui - temp; |
| 101 | tmin = S_DIV_ROUND_UP(temp, ui) - 2; |
| 102 | timing->hs_zero = linear_inter(tmax, tmin, pcnt2, 24, true); |
| 103 | |
| 104 | temp = 105 * coeff + 12 * ui - 20 * coeff; |
| 105 | tmax = S_DIV_ROUND_UP(temp, ui) - 2; |
| 106 | temp = 60 * coeff + 4 * ui; |
| 107 | tmin = DIV_ROUND_UP(temp, ui) - 2; |
| 108 | timing->hs_trail = linear_inter(tmax, tmin, pcnt3, 0, true); |
| 109 | |
| 110 | tmax = 255; |
| 111 | tmin = S_DIV_ROUND_UP(100 * coeff, ui) - 2; |
| 112 | timing->hs_exit = linear_inter(tmax, tmin, pcnt2, 0, true); |
| 113 | |
| 114 | tmax = 63; |
| 115 | temp = ((timing->hs_exit >> 1) + 1) * 2 * ui; |
| 116 | temp = 60 * coeff + 52 * ui - 24 * ui - temp; |
| 117 | tmin = S_DIV_ROUND_UP(temp, 8 * ui) - 1; |
| 118 | timing->clk_post = linear_inter(tmax, tmin, pcnt2, 0, false); |
| 119 | |
| 120 | tmax = 63; |
| 121 | temp = ((timing->clk_prepare >> 1) + 1) * 2 * ui; |
| 122 | temp += ((timing->clk_zero >> 1) + 1) * 2 * ui; |
| 123 | temp += 8 * ui + lpx; |
| 124 | tmin = S_DIV_ROUND_UP(temp, 8 * ui) - 1; |
| 125 | if (tmin > tmax) { |
| 126 | temp = linear_inter(2 * tmax, tmin, pcnt2, 0, false); |
| 127 | timing->clk_pre = temp >> 1; |
| 128 | } else { |
| 129 | timing->clk_pre = linear_inter(tmax, tmin, pcnt2, 0, false); |
| 130 | } |
| 131 | |
| 132 | timing->ta_go = 3; |
| 133 | timing->ta_sure = 0; |
| 134 | timing->ta_get = 4; |
| 135 | |
| 136 | DBG("PHY timings: %d, %d, %d, %d, %d, %d, %d, %d, %d, %d", |
| 137 | timing->clk_pre, timing->clk_post, timing->clk_zero, |
| 138 | timing->clk_trail, timing->clk_prepare, timing->hs_exit, |
| 139 | timing->hs_zero, timing->hs_prepare, timing->hs_trail, |
| 140 | timing->hs_rqst); |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | void msm_dsi_phy_set_src_pll(struct msm_dsi_phy *phy, int pll_id, u32 reg, |
| 146 | u32 bit_mask) |
| 147 | { |
| 148 | int phy_id = phy->id; |
| 149 | u32 val; |
| 150 | |
| 151 | if ((phy_id >= DSI_MAX) || (pll_id >= DSI_MAX)) |
| 152 | return; |
| 153 | |
| 154 | val = dsi_phy_read(phy->base + reg); |
| 155 | |
| 156 | if (phy->cfg->src_pll_truthtable[phy_id][pll_id]) |
| 157 | dsi_phy_write(phy->base + reg, val | bit_mask); |
| 158 | else |
| 159 | dsi_phy_write(phy->base + reg, val & (~bit_mask)); |
| 160 | } |
| 161 | |
| 162 | static int dsi_phy_regulator_init(struct msm_dsi_phy *phy) |
| 163 | { |
| 164 | struct regulator_bulk_data *s = phy->supplies; |
| 165 | const struct dsi_reg_entry *regs = phy->cfg->reg_cfg.regs; |
| 166 | struct device *dev = &phy->pdev->dev; |
| 167 | int num = phy->cfg->reg_cfg.num; |
| 168 | int i, ret; |
| 169 | |
| 170 | for (i = 0; i < num; i++) |
| 171 | s[i].supply = regs[i].name; |
| 172 | |
| 173 | ret = devm_regulator_bulk_get(dev, num, s); |
| 174 | if (ret < 0) { |
| 175 | dev_err(dev, "%s: failed to init regulator, ret=%d\n", |
| 176 | __func__, ret); |
| 177 | return ret; |
| 178 | } |
| 179 | |
| 180 | for (i = 0; i < num; i++) { |
Bjorn Andersson | 556a76e | 2015-08-18 10:34:32 -0700 | [diff] [blame] | 181 | if (regulator_can_change_voltage(s[i].consumer)) { |
Hai Li | 5c82902 | 2015-08-13 17:45:52 -0400 | [diff] [blame] | 182 | ret = regulator_set_voltage(s[i].consumer, |
| 183 | regs[i].min_voltage, regs[i].max_voltage); |
| 184 | if (ret < 0) { |
| 185 | dev_err(dev, |
| 186 | "regulator %d set voltage failed, %d\n", |
| 187 | i, ret); |
| 188 | return ret; |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static void dsi_phy_regulator_disable(struct msm_dsi_phy *phy) |
| 197 | { |
| 198 | struct regulator_bulk_data *s = phy->supplies; |
| 199 | const struct dsi_reg_entry *regs = phy->cfg->reg_cfg.regs; |
| 200 | int num = phy->cfg->reg_cfg.num; |
| 201 | int i; |
| 202 | |
| 203 | DBG(""); |
| 204 | for (i = num - 1; i >= 0; i--) |
| 205 | if (regs[i].disable_load >= 0) |
| 206 | regulator_set_load(s[i].consumer, regs[i].disable_load); |
| 207 | |
| 208 | regulator_bulk_disable(num, s); |
| 209 | } |
| 210 | |
| 211 | static int dsi_phy_regulator_enable(struct msm_dsi_phy *phy) |
| 212 | { |
| 213 | struct regulator_bulk_data *s = phy->supplies; |
| 214 | const struct dsi_reg_entry *regs = phy->cfg->reg_cfg.regs; |
| 215 | struct device *dev = &phy->pdev->dev; |
| 216 | int num = phy->cfg->reg_cfg.num; |
| 217 | int ret, i; |
| 218 | |
| 219 | DBG(""); |
| 220 | for (i = 0; i < num; i++) { |
| 221 | if (regs[i].enable_load >= 0) { |
| 222 | ret = regulator_set_load(s[i].consumer, |
| 223 | regs[i].enable_load); |
| 224 | if (ret < 0) { |
| 225 | dev_err(dev, |
| 226 | "regulator %d set op mode failed, %d\n", |
| 227 | i, ret); |
| 228 | goto fail; |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | ret = regulator_bulk_enable(num, s); |
| 234 | if (ret < 0) { |
| 235 | dev_err(dev, "regulator enable failed, %d\n", ret); |
| 236 | goto fail; |
| 237 | } |
| 238 | |
| 239 | return 0; |
| 240 | |
| 241 | fail: |
| 242 | for (i--; i >= 0; i--) |
| 243 | regulator_set_load(s[i].consumer, regs[i].disable_load); |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | static int dsi_phy_enable_resource(struct msm_dsi_phy *phy) |
| 248 | { |
| 249 | struct device *dev = &phy->pdev->dev; |
| 250 | int ret; |
| 251 | |
| 252 | pm_runtime_get_sync(dev); |
| 253 | |
| 254 | ret = clk_prepare_enable(phy->ahb_clk); |
| 255 | if (ret) { |
| 256 | dev_err(dev, "%s: can't enable ahb clk, %d\n", __func__, ret); |
| 257 | pm_runtime_put_sync(dev); |
| 258 | } |
| 259 | |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | static void dsi_phy_disable_resource(struct msm_dsi_phy *phy) |
| 264 | { |
| 265 | clk_disable_unprepare(phy->ahb_clk); |
| 266 | pm_runtime_put_sync(&phy->pdev->dev); |
| 267 | } |
| 268 | |
| 269 | static const struct of_device_id dsi_phy_dt_match[] = { |
Hai Li | 1bf4d7c | 2015-08-13 17:45:53 -0400 | [diff] [blame] | 270 | #ifdef CONFIG_DRM_MSM_DSI_28NM_PHY |
Hai Li | 5c82902 | 2015-08-13 17:45:52 -0400 | [diff] [blame] | 271 | { .compatible = "qcom,dsi-phy-28nm-hpm", |
| 272 | .data = &dsi_phy_28nm_hpm_cfgs }, |
| 273 | { .compatible = "qcom,dsi-phy-28nm-lp", |
| 274 | .data = &dsi_phy_28nm_lp_cfgs }, |
Hai Li | 1bf4d7c | 2015-08-13 17:45:53 -0400 | [diff] [blame] | 275 | #endif |
| 276 | #ifdef CONFIG_DRM_MSM_DSI_20NM_PHY |
Hai Li | 5c82902 | 2015-08-13 17:45:52 -0400 | [diff] [blame] | 277 | { .compatible = "qcom,dsi-phy-20nm", |
| 278 | .data = &dsi_phy_20nm_cfgs }, |
Hai Li | 1bf4d7c | 2015-08-13 17:45:53 -0400 | [diff] [blame] | 279 | #endif |
Hai Li | 5c82902 | 2015-08-13 17:45:52 -0400 | [diff] [blame] | 280 | {} |
| 281 | }; |
| 282 | |
| 283 | static int dsi_phy_driver_probe(struct platform_device *pdev) |
| 284 | { |
| 285 | struct msm_dsi_phy *phy; |
| 286 | struct device *dev = &pdev->dev; |
| 287 | const struct of_device_id *match; |
| 288 | int ret; |
| 289 | |
| 290 | phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); |
| 291 | if (!phy) |
| 292 | return -ENOMEM; |
| 293 | |
| 294 | match = of_match_node(dsi_phy_dt_match, dev->of_node); |
| 295 | if (!match) |
| 296 | return -ENODEV; |
| 297 | |
| 298 | phy->cfg = match->data; |
| 299 | phy->pdev = pdev; |
| 300 | |
| 301 | ret = of_property_read_u32(dev->of_node, |
| 302 | "qcom,dsi-phy-index", &phy->id); |
| 303 | if (ret) { |
| 304 | dev_err(dev, "%s: PHY index not specified, %d\n", |
| 305 | __func__, ret); |
| 306 | goto fail; |
| 307 | } |
| 308 | |
| 309 | phy->regulator_ldo_mode = of_property_read_bool(dev->of_node, |
| 310 | "qcom,dsi-phy-regulator-ldo-mode"); |
| 311 | |
| 312 | phy->base = msm_ioremap(pdev, "dsi_phy", "DSI_PHY"); |
| 313 | if (IS_ERR(phy->base)) { |
| 314 | dev_err(dev, "%s: failed to map phy base\n", __func__); |
| 315 | ret = -ENOMEM; |
| 316 | goto fail; |
| 317 | } |
| 318 | |
| 319 | phy->reg_base = msm_ioremap(pdev, "dsi_phy_regulator", |
| 320 | "DSI_PHY_REG"); |
| 321 | if (IS_ERR(phy->reg_base)) { |
| 322 | dev_err(dev, "%s: failed to map phy regulator base\n", |
| 323 | __func__); |
| 324 | ret = -ENOMEM; |
| 325 | goto fail; |
| 326 | } |
| 327 | |
| 328 | ret = dsi_phy_regulator_init(phy); |
| 329 | if (ret) { |
| 330 | dev_err(dev, "%s: failed to init regulator\n", __func__); |
| 331 | goto fail; |
| 332 | } |
| 333 | |
| 334 | phy->ahb_clk = devm_clk_get(dev, "iface_clk"); |
| 335 | if (IS_ERR(phy->ahb_clk)) { |
| 336 | dev_err(dev, "%s: Unable to get ahb clk\n", __func__); |
| 337 | ret = PTR_ERR(phy->ahb_clk); |
| 338 | goto fail; |
| 339 | } |
| 340 | |
| 341 | /* PLL init will call into clk_register which requires |
| 342 | * register access, so we need to enable power and ahb clock. |
| 343 | */ |
| 344 | ret = dsi_phy_enable_resource(phy); |
| 345 | if (ret) |
| 346 | goto fail; |
| 347 | |
| 348 | phy->pll = msm_dsi_pll_init(pdev, phy->cfg->type, phy->id); |
| 349 | if (!phy->pll) |
| 350 | dev_info(dev, |
| 351 | "%s: pll init failed, need separate pll clk driver\n", |
| 352 | __func__); |
| 353 | |
| 354 | dsi_phy_disable_resource(phy); |
| 355 | |
| 356 | platform_set_drvdata(pdev, phy); |
| 357 | |
| 358 | return 0; |
| 359 | |
| 360 | fail: |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | static int dsi_phy_driver_remove(struct platform_device *pdev) |
| 365 | { |
| 366 | struct msm_dsi_phy *phy = platform_get_drvdata(pdev); |
| 367 | |
| 368 | if (phy && phy->pll) { |
| 369 | msm_dsi_pll_destroy(phy->pll); |
| 370 | phy->pll = NULL; |
| 371 | } |
| 372 | |
| 373 | platform_set_drvdata(pdev, NULL); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | static struct platform_driver dsi_phy_platform_driver = { |
| 379 | .probe = dsi_phy_driver_probe, |
| 380 | .remove = dsi_phy_driver_remove, |
| 381 | .driver = { |
| 382 | .name = "msm_dsi_phy", |
| 383 | .of_match_table = dsi_phy_dt_match, |
| 384 | }, |
| 385 | }; |
| 386 | |
| 387 | void __init msm_dsi_phy_driver_register(void) |
| 388 | { |
| 389 | platform_driver_register(&dsi_phy_platform_driver); |
| 390 | } |
| 391 | |
| 392 | void __exit msm_dsi_phy_driver_unregister(void) |
| 393 | { |
| 394 | platform_driver_unregister(&dsi_phy_platform_driver); |
| 395 | } |
| 396 | |
| 397 | int msm_dsi_phy_enable(struct msm_dsi_phy *phy, int src_pll_id, |
| 398 | const unsigned long bit_rate, const unsigned long esc_rate) |
| 399 | { |
| 400 | struct device *dev = &phy->pdev->dev; |
| 401 | int ret; |
| 402 | |
| 403 | if (!phy || !phy->cfg->ops.enable) |
| 404 | return -EINVAL; |
| 405 | |
| 406 | ret = dsi_phy_regulator_enable(phy); |
| 407 | if (ret) { |
| 408 | dev_err(dev, "%s: regulator enable failed, %d\n", |
| 409 | __func__, ret); |
| 410 | return ret; |
| 411 | } |
| 412 | |
| 413 | ret = phy->cfg->ops.enable(phy, src_pll_id, bit_rate, esc_rate); |
| 414 | if (ret) { |
| 415 | dev_err(dev, "%s: phy enable failed, %d\n", __func__, ret); |
| 416 | dsi_phy_regulator_disable(phy); |
| 417 | return ret; |
| 418 | } |
| 419 | |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | void msm_dsi_phy_disable(struct msm_dsi_phy *phy) |
| 424 | { |
| 425 | if (!phy || !phy->cfg->ops.disable) |
| 426 | return; |
| 427 | |
| 428 | phy->cfg->ops.disable(phy); |
| 429 | |
| 430 | dsi_phy_regulator_disable(phy); |
| 431 | } |
| 432 | |
| 433 | void msm_dsi_phy_get_clk_pre_post(struct msm_dsi_phy *phy, |
| 434 | u32 *clk_pre, u32 *clk_post) |
| 435 | { |
| 436 | if (!phy) |
| 437 | return; |
| 438 | |
| 439 | if (clk_pre) |
| 440 | *clk_pre = phy->timing.clk_pre; |
| 441 | if (clk_post) |
| 442 | *clk_post = phy->timing.clk_post; |
| 443 | } |
| 444 | |
| 445 | struct msm_dsi_pll *msm_dsi_phy_get_pll(struct msm_dsi_phy *phy) |
| 446 | { |
| 447 | if (!phy) |
| 448 | return NULL; |
| 449 | |
| 450 | return phy->pll; |
| 451 | } |
| 452 | |