Yuchen Huang | 9a640c0 | 2021-10-28 20:27:17 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | /* |
| 4 | * This file is created based on MT8186 Functional Specification |
| 5 | * Chapter number: 5.13 |
| 6 | */ |
| 7 | |
| 8 | #include <delay.h> |
Yuchen Huang | 9a640c0 | 2021-10-28 20:27:17 +0800 | [diff] [blame] | 9 | #include <soc/rtc.h> |
| 10 | #include <soc/rtc_common.h> |
| 11 | #include <soc/mt6366.h> |
| 12 | #include <soc/pmic_wrap.h> |
| 13 | #include <timer.h> |
| 14 | |
Rex-BC Chen | 4fd80b2 | 2022-03-03 19:16:04 +0800 | [diff] [blame] | 15 | #define MT8186_RTC_DXCO_CAPID 0xE0 |
Rex-BC Chen | c89f252 | 2022-02-11 16:10:05 +0800 | [diff] [blame] | 16 | |
Yuchen Huang | 9a640c0 | 2021-10-28 20:27:17 +0800 | [diff] [blame] | 17 | /* Initialize RTC setting of using DCXO clock */ |
| 18 | static bool rtc_enable_dcxo(void) |
| 19 | { |
| 20 | u16 bbpu, con, osc32con, sec; |
| 21 | |
| 22 | rtc_read(RTC_BBPU, &bbpu); |
| 23 | rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); |
| 24 | |
| 25 | if (!rtc_write_trigger()) { |
| 26 | rtc_info("rtc_write_trigger() failed\n"); |
| 27 | return false; |
| 28 | } |
| 29 | |
| 30 | mdelay(1); |
| 31 | if (!rtc_writeif_unlock()) { |
| 32 | rtc_info("rtc_writeif_unlock() failed\n"); |
| 33 | return false; |
| 34 | } |
| 35 | |
| 36 | rtc_read(RTC_OSC32CON, &osc32con); |
| 37 | osc32con &= ~(RTC_EMBCK_SRC_SEL | RTC_EMBCK_SEL_MODE_MASK |
| 38 | | RTC_GPS_CKOUT_EN); |
| 39 | osc32con |= RTC_XOSC32_ENB | RTC_REG_XOSC32_ENB |
| 40 | | RTC_EMB_K_EOSC32_MODE | RTC_EMBCK_SEL_OPTION; |
| 41 | if (!rtc_xosc_write(osc32con)) { |
| 42 | rtc_info("rtc_xosc_write() failed\n"); |
| 43 | return false; |
| 44 | } |
| 45 | |
| 46 | rtc_read(RTC_CON, &con); |
| 47 | rtc_read(RTC_OSC32CON, &osc32con); |
| 48 | rtc_read(RTC_AL_SEC, &sec); |
| 49 | rtc_info("con = %#x, osc32con = %#x, sec = %#x\n", con, osc32con, sec); |
| 50 | |
| 51 | return true; |
| 52 | } |
| 53 | |
| 54 | /* Initialize RTC related gpio */ |
| 55 | bool rtc_gpio_init(void) |
| 56 | { |
| 57 | u16 con; |
| 58 | |
| 59 | /* RTC_32K1V8 clock change from 128k div 4 source to RTC 32k source */ |
| 60 | pwrap_write_field(PMIC_RG_TOP_CKSEL_CON0_SET, 0x1, 0x1, 3); |
| 61 | |
| 62 | /* Export 32K clock RTC_32K1V8_1 */ |
| 63 | pwrap_write_field(PMIC_RG_TOP_CKPDN_CON1_CLR, 0x1, 0x1, 1); |
| 64 | |
| 65 | /* Export 32K clock RTC_32K2V8 */ |
| 66 | rtc_read(RTC_CON, &con); |
| 67 | con &= (RTC_CON_LPSTA_RAW | RTC_CON_LPRST | RTC_CON_EOSC32_LPEN |
| 68 | | RTC_CON_XOSC32_LPEN); |
| 69 | con |= (RTC_CON_GPEN | RTC_CON_GOE); |
| 70 | con &= ~RTC_CON_F32KOB; |
| 71 | rtc_write(RTC_CON, con); |
| 72 | |
| 73 | return rtc_write_trigger(); |
| 74 | } |
| 75 | |
| 76 | u16 rtc_get_frequency_meter(u16 val, u16 measure_src, u16 window_size) |
| 77 | { |
| 78 | u16 bbpu, osc32con; |
| 79 | u16 fqmtr_busy, fqmtr_data, fqmtr_rst, fqmtr_tcksel; |
| 80 | struct stopwatch sw; |
| 81 | |
| 82 | rtc_read(RTC_BBPU, &bbpu); |
| 83 | rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); |
| 84 | if (!rtc_write_trigger()) { |
| 85 | rtc_info("rtc_write_trigger() failed\n"); |
| 86 | return false; |
| 87 | } |
| 88 | |
| 89 | rtc_read(RTC_OSC32CON, &osc32con); |
Rex-BC Chen | ffe50fd | 2021-11-25 15:06:23 +0800 | [diff] [blame] | 90 | if (!rtc_xosc_write((osc32con & ~RTC_XOSCCALI_MASK) | |
| 91 | (val & RTC_XOSCCALI_MASK))) { |
Yuchen Huang | 9a640c0 | 2021-10-28 20:27:17 +0800 | [diff] [blame] | 92 | rtc_info("rtc_xosc_write() failed\n"); |
| 93 | return false; |
| 94 | } |
| 95 | |
| 96 | /* Enable FQMTR clock */ |
| 97 | pwrap_write_field(PMIC_RG_TOP_CKPDN_CON0_CLR, 1, 1, |
| 98 | PMIC_RG_FQMTR_32K_CK_PDN_SHIFT); |
| 99 | pwrap_write_field(PMIC_RG_TOP_CKPDN_CON0_CLR, 1, 1, |
| 100 | PMIC_RG_FQMTR_CK_PDN_SHIFT); |
| 101 | |
| 102 | /* FQMTR reset */ |
| 103 | pwrap_write_field(PMIC_RG_FQMTR_RST, 1, 1, PMIC_FQMTR_RST_SHIFT); |
| 104 | do { |
| 105 | rtc_read(PMIC_RG_FQMTR_DATA, &fqmtr_data); |
| 106 | rtc_read(PMIC_RG_FQMTR_CON0, &fqmtr_busy); |
| 107 | } while (fqmtr_data && (fqmtr_busy & PMIC_FQMTR_CON0_BUSY)); |
| 108 | rtc_read(PMIC_RG_FQMTR_RST, &fqmtr_rst); |
| 109 | /* FQMTR normal */ |
| 110 | pwrap_write_field(PMIC_RG_FQMTR_RST, 0, 1, PMIC_FQMTR_RST_SHIFT); |
| 111 | |
| 112 | /* Set frequency meter window value (0=1X32K(fixed clock)) */ |
| 113 | rtc_write(PMIC_RG_FQMTR_WINSET, window_size); |
| 114 | /* Enable 26M and set test clock source */ |
| 115 | rtc_write(PMIC_RG_FQMTR_CON0, PMIC_FQMTR_CON0_DCXO26M_EN | measure_src); |
| 116 | /* Enable 26M -> delay 100us -> enable FQMTR */ |
| 117 | udelay(100); |
| 118 | rtc_read(PMIC_RG_FQMTR_CON0, &fqmtr_tcksel); |
| 119 | /* Enable FQMTR */ |
| 120 | rtc_write(PMIC_RG_FQMTR_CON0, fqmtr_tcksel | PMIC_FQMTR_CON0_FQMTR_EN); |
| 121 | udelay(100); |
| 122 | |
| 123 | stopwatch_init_usecs_expire(&sw, FQMTR_TIMEOUT_US); |
| 124 | /* FQMTR read until ready */ |
| 125 | if (!wait_us(FQMTR_TIMEOUT_US, |
| 126 | rtc_read(PMIC_RG_FQMTR_CON0, &fqmtr_busy) == 0 && |
| 127 | !(fqmtr_busy & PMIC_FQMTR_CON0_BUSY))) { |
| 128 | rtc_info("get frequency time out: %#x\n", fqmtr_busy); |
| 129 | return false; |
| 130 | } |
| 131 | |
| 132 | /* Read data should be closed to 26M/32k = 794 */ |
| 133 | rtc_read(PMIC_RG_FQMTR_DATA, &fqmtr_data); |
| 134 | |
| 135 | rtc_read(PMIC_RG_FQMTR_CON0, &fqmtr_tcksel); |
| 136 | /* Disable FQMTR */ |
| 137 | rtc_write(PMIC_RG_FQMTR_CON0, fqmtr_tcksel & ~PMIC_FQMTR_CON0_FQMTR_EN); |
| 138 | /* Disable FQMTR -> delay 100us -> disable 26M */ |
| 139 | udelay(100); |
| 140 | /* Disable 26M */ |
| 141 | rtc_read(PMIC_RG_FQMTR_CON0, &fqmtr_tcksel); |
| 142 | rtc_write(PMIC_RG_FQMTR_CON0, |
| 143 | fqmtr_tcksel & ~PMIC_FQMTR_CON0_DCXO26M_EN); |
| 144 | rtc_info("input = %#x, output = %#x\n", val, fqmtr_data); |
| 145 | |
| 146 | /* Disable FQMTR clock */ |
| 147 | pwrap_write_field(PMIC_RG_TOP_CKPDN_CON0_SET, 1, 1, |
| 148 | PMIC_RG_FQMTR_32K_CK_PDN_SHIFT); |
| 149 | pwrap_write_field(PMIC_RG_TOP_CKPDN_CON0_SET, 1, 1, |
| 150 | PMIC_RG_FQMTR_CK_PDN_SHIFT); |
| 151 | |
| 152 | return fqmtr_data; |
| 153 | } |
| 154 | |
| 155 | /* Low power detect setting */ |
| 156 | static bool rtc_lpd_init(void) |
| 157 | { |
| 158 | u16 con, sec; |
| 159 | |
| 160 | /* Set RTC_LPD_OPT */ |
| 161 | rtc_read(RTC_AL_SEC, &sec); |
| 162 | sec |= RTC_LPD_OPT_F32K_CK_ALIVE; |
| 163 | rtc_write(RTC_AL_SEC, sec); |
| 164 | if (!rtc_write_trigger()) { |
| 165 | rtc_info("rtc_write_trigger() failed\n"); |
| 166 | return false; |
| 167 | } |
| 168 | |
| 169 | /* Initialize XOSC32 to detect 32k clock stop */ |
| 170 | rtc_read(RTC_CON, &con); |
| 171 | con |= RTC_CON_XOSC32_LPEN; |
| 172 | if (!rtc_lpen(con)) |
| 173 | return false; |
| 174 | |
| 175 | /* Initialize EOSC32 to detect RTC low power */ |
| 176 | rtc_read(RTC_CON, &con); |
| 177 | con |= RTC_CON_EOSC32_LPEN; |
| 178 | if (!rtc_lpen(con)) |
| 179 | return false; |
| 180 | |
| 181 | rtc_read(RTC_CON, &con); |
| 182 | con &= ~RTC_CON_XOSC32_LPEN; |
| 183 | rtc_write(RTC_CON, con); |
| 184 | |
| 185 | /* Set RTC_LPD_OPT */ |
| 186 | rtc_read(RTC_AL_SEC, &sec); |
| 187 | sec &= ~RTC_LPD_OPT_MASK; |
| 188 | sec |= RTC_LPD_OPT_EOSC_LPD; |
| 189 | rtc_write(RTC_AL_SEC, sec); |
| 190 | if (!rtc_write_trigger()) { |
| 191 | rtc_info("rtc_write_trigger() failed\n"); |
| 192 | return false; |
| 193 | } |
| 194 | |
| 195 | return true; |
| 196 | } |
| 197 | |
| 198 | static bool rtc_hw_init(void) |
| 199 | { |
| 200 | u16 bbpu; |
| 201 | |
| 202 | rtc_read(RTC_BBPU, &bbpu); |
| 203 | rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_INIT); |
| 204 | if (!rtc_write_trigger()) { |
| 205 | rtc_info("rtc_write_trigger() failed\n"); |
| 206 | return false; |
| 207 | } |
| 208 | |
| 209 | udelay(500); |
| 210 | |
| 211 | rtc_read(RTC_BBPU, &bbpu); |
| 212 | rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); |
| 213 | if (!rtc_write_trigger()) { |
| 214 | rtc_info("rtc_write_trigger() failed\n"); |
| 215 | return false; |
| 216 | } |
| 217 | |
| 218 | rtc_read(RTC_BBPU, &bbpu); |
| 219 | if (bbpu & RTC_BBPU_INIT) { |
| 220 | rtc_info("timeout\n"); |
| 221 | return false; |
| 222 | } |
| 223 | |
| 224 | return true; |
| 225 | } |
| 226 | |
| 227 | static void mt6366_dcxo_disable_unused(void) |
| 228 | { |
| 229 | /* Disable clock buffer XO_CEL */ |
| 230 | rtc_write(PMIC_RG_DCXO_CW00_CLR, 0x0800); |
| 231 | /* Mask bblpm request and switch off bblpm mode */ |
| 232 | rtc_write(PMIC_RG_DCXO_CW23, 0x0052); |
| 233 | } |
| 234 | |
Rex-BC Chen | c89f252 | 2022-02-11 16:10:05 +0800 | [diff] [blame] | 235 | static void rtc_set_capid(u16 capid) |
| 236 | { |
| 237 | u16 read_capid; |
| 238 | |
| 239 | rtc_write(PMIC_RG_DCXO_CW03, 0xFF00 | capid); |
| 240 | |
| 241 | rtc_read(PMIC_RG_DCXO_CW03, &read_capid); |
| 242 | rtc_info("read back capid: %#x\n", read_capid & 0xFF); |
| 243 | } |
| 244 | |
Yuchen Huang | 9a640c0 | 2021-10-28 20:27:17 +0800 | [diff] [blame] | 245 | /* Check RTC Initialization */ |
| 246 | int rtc_init(int recover) |
| 247 | { |
| 248 | int ret; |
| 249 | |
| 250 | rtc_info("recovery: %d\n", recover); |
| 251 | |
| 252 | /* Write powerkeys to enable RTC functions */ |
| 253 | if (!rtc_powerkey_init()) { |
| 254 | ret = -RTC_STATUS_POWERKEY_INIT_FAIL; |
| 255 | goto err; |
| 256 | } |
| 257 | |
| 258 | /* Write interface unlock need to be set after powerkey match */ |
| 259 | if (!rtc_writeif_unlock()) { |
| 260 | ret = -RTC_STATUS_WRITEIF_UNLOCK_FAIL; |
| 261 | goto err; |
| 262 | } |
| 263 | |
| 264 | rtc_osc_init(); |
| 265 | |
| 266 | /* In recovery mode, we need 20ms delay for register setting. */ |
| 267 | if (recover) |
| 268 | mdelay(20); |
| 269 | |
| 270 | if (!rtc_gpio_init()) { |
| 271 | ret = -RTC_STATUS_GPIO_INIT_FAIL; |
| 272 | goto err; |
| 273 | } |
| 274 | |
| 275 | if (!rtc_hw_init()) { |
| 276 | ret = -RTC_STATUS_HW_INIT_FAIL; |
| 277 | goto err; |
| 278 | } |
| 279 | |
| 280 | if (!rtc_reg_init()) { |
| 281 | ret = -RTC_STATUS_REG_INIT_FAIL; |
| 282 | goto err; |
| 283 | } |
| 284 | |
| 285 | if (!rtc_lpd_init()) { |
| 286 | ret = -RTC_STATUS_LPD_INIT_FAIL; |
| 287 | goto err; |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | * After lpd init, powerkeys need to be written again to enable |
| 292 | * low power detect function. |
| 293 | */ |
| 294 | if (!rtc_powerkey_init()) { |
| 295 | ret = -RTC_STATUS_POWERKEY_INIT_FAIL; |
| 296 | goto err; |
| 297 | } |
| 298 | |
| 299 | return RTC_STATUS_OK; |
| 300 | err: |
| 301 | rtc_info("init failed: ret = %d\n", ret); |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | /* Enable RTC bbpu */ |
| 306 | void rtc_bbpu_power_on(void) |
| 307 | { |
| 308 | u16 bbpu; |
| 309 | int ret; |
| 310 | |
| 311 | /* Pull powerhold high, control by pmic */ |
| 312 | mt6366_set_power_hold(true); |
| 313 | |
| 314 | /* Pull PWRBB high */ |
| 315 | bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_RELOAD | RTC_BBPU_PWREN; |
| 316 | rtc_write(RTC_BBPU, bbpu); |
| 317 | ret = rtc_write_trigger(); |
| 318 | rtc_info("rtc_write_trigger = %d\n", ret); |
| 319 | |
| 320 | rtc_read(RTC_BBPU, &bbpu); |
| 321 | rtc_info("done BBPU = %#x\n", bbpu); |
| 322 | } |
| 323 | |
| 324 | static void dcxo_init(void) |
| 325 | { |
| 326 | /* Buffer setting */ |
| 327 | rtc_write(PMIC_RG_DCXO_CW15, 0xA2AA); |
| 328 | rtc_write(PMIC_RG_DCXO_CW13, 0x98E9); |
| 329 | rtc_write(PMIC_RG_DCXO_CW16, 0x9855); |
| 330 | |
| 331 | /* 26M enable control */ |
| 332 | /* Enable clock buffer XO_SOC, XO_CEL */ |
| 333 | rtc_write(PMIC_RG_DCXO_CW00, 0x4805); |
| 334 | rtc_write(PMIC_RG_DCXO_CW11, 0x8000); |
| 335 | |
| 336 | /* Load thermal coefficient */ |
| 337 | rtc_write(PMIC_RG_TOP_TMA_KEY, 0x9CA7); |
| 338 | rtc_write(PMIC_RG_DCXO_CW21, 0x12A7); |
| 339 | rtc_write(PMIC_RG_DCXO_ELR0, 0xD004); |
| 340 | rtc_write(PMIC_RG_TOP_TMA_KEY, 0x0000); |
| 341 | |
| 342 | /* Adjust OSC FPM setting */ |
| 343 | rtc_write(PMIC_RG_DCXO_CW07, 0x8FFE); |
| 344 | |
| 345 | /* Re-calibrate OSC current */ |
| 346 | rtc_write(PMIC_RG_DCXO_CW09, 0x008F); |
| 347 | udelay(100); |
| 348 | rtc_write(PMIC_RG_DCXO_CW09, 0x408F); |
| 349 | mdelay(5); |
| 350 | |
Rex-BC Chen | c89f252 | 2022-02-11 16:10:05 +0800 | [diff] [blame] | 351 | rtc_set_capid(MT8186_RTC_DXCO_CAPID); |
| 352 | |
Yuchen Huang | 9a640c0 | 2021-10-28 20:27:17 +0800 | [diff] [blame] | 353 | mt6366_dcxo_disable_unused(); |
| 354 | } |
| 355 | |
| 356 | /* Initialize rtc boot flow */ |
| 357 | void rtc_boot(void) |
| 358 | { |
| 359 | /* DCXO clock initialized settings */ |
| 360 | dcxo_init(); |
| 361 | |
| 362 | /* DCXO 32k initialized settings */ |
| 363 | pwrap_write_field(PMIC_RG_DCXO_CW02, 0xF, 0xF, 0); |
| 364 | pwrap_write_field(PMIC_RG_SCK_TOP_CON0, 0x1, 0x1, 0); |
| 365 | |
| 366 | /* Use DCXO 32K clock */ |
| 367 | if (!rtc_enable_dcxo()) |
| 368 | rtc_info("rtc_enable_dcxo() failed\n"); |
| 369 | |
| 370 | rtc_boot_common(); |
| 371 | rtc_bbpu_power_on(); |
| 372 | } |