19d0c49faSNobuhiro Iwamatsu // SPDX-License-Identifier: GPL-2.0-only 2dc59ed38SLaxman Dewangan /* 3dc59ed38SLaxman Dewangan * rtc-tps6586x.c: RTC driver for TI PMIC TPS6586X 4dc59ed38SLaxman Dewangan * 5dc59ed38SLaxman Dewangan * Copyright (c) 2012, NVIDIA Corporation. 6dc59ed38SLaxman Dewangan * 7dc59ed38SLaxman Dewangan * Author: Laxman Dewangan <ldewangan@nvidia.com> 8dc59ed38SLaxman Dewangan */ 9dc59ed38SLaxman Dewangan 10dc59ed38SLaxman Dewangan #include <linux/device.h> 11dc59ed38SLaxman Dewangan #include <linux/err.h> 12dc59ed38SLaxman Dewangan #include <linux/init.h> 134c4ab451SDmitry Osipenko #include <linux/irq.h> 14dc59ed38SLaxman Dewangan #include <linux/kernel.h> 15dc59ed38SLaxman Dewangan #include <linux/mfd/tps6586x.h> 16dc59ed38SLaxman Dewangan #include <linux/module.h> 17dc59ed38SLaxman Dewangan #include <linux/platform_device.h> 18dc59ed38SLaxman Dewangan #include <linux/pm_runtime.h> 19dc59ed38SLaxman Dewangan #include <linux/rtc.h> 20dc59ed38SLaxman Dewangan #include <linux/slab.h> 21dc59ed38SLaxman Dewangan 22dc59ed38SLaxman Dewangan #define RTC_CTRL 0xc0 23dc59ed38SLaxman Dewangan #define POR_RESET_N BIT(7) 24dc59ed38SLaxman Dewangan #define OSC_SRC_SEL BIT(6) 25dc59ed38SLaxman Dewangan #define RTC_ENABLE BIT(5) /* enables alarm */ 26dc59ed38SLaxman Dewangan #define RTC_BUF_ENABLE BIT(4) /* 32 KHz buffer enable */ 27dc59ed38SLaxman Dewangan #define PRE_BYPASS BIT(3) /* 0=1KHz or 1=32KHz updates */ 28dc59ed38SLaxman Dewangan #define CL_SEL_MASK (BIT(2)|BIT(1)) 29dc59ed38SLaxman Dewangan #define CL_SEL_POS 1 30dc59ed38SLaxman Dewangan #define RTC_ALARM1_HI 0xc1 31dc59ed38SLaxman Dewangan #define RTC_COUNT4 0xc6 32dc59ed38SLaxman Dewangan 33dc59ed38SLaxman Dewangan /* start a PMU RTC access by reading the register prior to the RTC_COUNT4 */ 34dc59ed38SLaxman Dewangan #define RTC_COUNT4_DUMMYREAD 0xc5 35dc59ed38SLaxman Dewangan 36dc59ed38SLaxman Dewangan /*only 14-bits width in second*/ 37dc59ed38SLaxman Dewangan #define ALM1_VALID_RANGE_IN_SEC 0x3FFF 38dc59ed38SLaxman Dewangan 39dc59ed38SLaxman Dewangan #define TPS6586X_RTC_CL_SEL_1_5PF 0x0 40dc59ed38SLaxman Dewangan #define TPS6586X_RTC_CL_SEL_6_5PF 0x1 41dc59ed38SLaxman Dewangan #define TPS6586X_RTC_CL_SEL_7_5PF 0x2 42dc59ed38SLaxman Dewangan #define TPS6586X_RTC_CL_SEL_12_5PF 0x3 43dc59ed38SLaxman Dewangan 44dc59ed38SLaxman Dewangan struct tps6586x_rtc { 45dc59ed38SLaxman Dewangan struct device *dev; 46dc59ed38SLaxman Dewangan struct rtc_device *rtc; 47dc59ed38SLaxman Dewangan int irq; 48dc59ed38SLaxman Dewangan bool irq_en; 49dc59ed38SLaxman Dewangan }; 50dc59ed38SLaxman Dewangan 51dc59ed38SLaxman Dewangan static inline struct device *to_tps6586x_dev(struct device *dev) 52dc59ed38SLaxman Dewangan { 53dc59ed38SLaxman Dewangan return dev->parent; 54dc59ed38SLaxman Dewangan } 55dc59ed38SLaxman Dewangan 56dc59ed38SLaxman Dewangan static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm) 57dc59ed38SLaxman Dewangan { 58dc59ed38SLaxman Dewangan struct device *tps_dev = to_tps6586x_dev(dev); 59dc59ed38SLaxman Dewangan unsigned long long ticks = 0; 607982df86SArnd Bergmann time64_t seconds; 61dc59ed38SLaxman Dewangan u8 buff[6]; 62dc59ed38SLaxman Dewangan int ret; 63dc59ed38SLaxman Dewangan int i; 64dc59ed38SLaxman Dewangan 65dc59ed38SLaxman Dewangan ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(buff), buff); 66dc59ed38SLaxman Dewangan if (ret < 0) { 67dc59ed38SLaxman Dewangan dev_err(dev, "read counter failed with err %d\n", ret); 68dc59ed38SLaxman Dewangan return ret; 69dc59ed38SLaxman Dewangan } 70dc59ed38SLaxman Dewangan 71dc59ed38SLaxman Dewangan for (i = 1; i < sizeof(buff); i++) { 72dc59ed38SLaxman Dewangan ticks <<= 8; 73dc59ed38SLaxman Dewangan ticks |= buff[i]; 74dc59ed38SLaxman Dewangan } 75dc59ed38SLaxman Dewangan 76dc59ed38SLaxman Dewangan seconds = ticks >> 10; 77180c92c4SAlexandre Belloni rtc_time64_to_tm(seconds, tm); 78180c92c4SAlexandre Belloni 79ab62670eSAlexandre Belloni return 0; 80dc59ed38SLaxman Dewangan } 81dc59ed38SLaxman Dewangan 82dc59ed38SLaxman Dewangan static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm) 83dc59ed38SLaxman Dewangan { 84dc59ed38SLaxman Dewangan struct device *tps_dev = to_tps6586x_dev(dev); 85dc59ed38SLaxman Dewangan unsigned long long ticks; 867982df86SArnd Bergmann time64_t seconds; 87dc59ed38SLaxman Dewangan u8 buff[5]; 88dc59ed38SLaxman Dewangan int ret; 89dc59ed38SLaxman Dewangan 907982df86SArnd Bergmann seconds = rtc_tm_to_time64(tm); 91dc59ed38SLaxman Dewangan 92dc59ed38SLaxman Dewangan ticks = (unsigned long long)seconds << 10; 93dc59ed38SLaxman Dewangan buff[0] = (ticks >> 32) & 0xff; 94dc59ed38SLaxman Dewangan buff[1] = (ticks >> 24) & 0xff; 95dc59ed38SLaxman Dewangan buff[2] = (ticks >> 16) & 0xff; 96dc59ed38SLaxman Dewangan buff[3] = (ticks >> 8) & 0xff; 97dc59ed38SLaxman Dewangan buff[4] = ticks & 0xff; 98dc59ed38SLaxman Dewangan 99dc59ed38SLaxman Dewangan /* Disable RTC before changing time */ 100dc59ed38SLaxman Dewangan ret = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE); 101dc59ed38SLaxman Dewangan if (ret < 0) { 102dc59ed38SLaxman Dewangan dev_err(dev, "failed to clear RTC_ENABLE\n"); 103dc59ed38SLaxman Dewangan return ret; 104dc59ed38SLaxman Dewangan } 105dc59ed38SLaxman Dewangan 106dc59ed38SLaxman Dewangan ret = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff); 107dc59ed38SLaxman Dewangan if (ret < 0) { 108dc59ed38SLaxman Dewangan dev_err(dev, "failed to program new time\n"); 109dc59ed38SLaxman Dewangan return ret; 110dc59ed38SLaxman Dewangan } 111dc59ed38SLaxman Dewangan 112dc59ed38SLaxman Dewangan /* Enable RTC */ 113dc59ed38SLaxman Dewangan ret = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE); 114dc59ed38SLaxman Dewangan if (ret < 0) { 115dc59ed38SLaxman Dewangan dev_err(dev, "failed to set RTC_ENABLE\n"); 116dc59ed38SLaxman Dewangan return ret; 117dc59ed38SLaxman Dewangan } 118dc59ed38SLaxman Dewangan return 0; 119dc59ed38SLaxman Dewangan } 120dc59ed38SLaxman Dewangan 121dc59ed38SLaxman Dewangan static int tps6586x_rtc_alarm_irq_enable(struct device *dev, 122dc59ed38SLaxman Dewangan unsigned int enabled) 123dc59ed38SLaxman Dewangan { 124dc59ed38SLaxman Dewangan struct tps6586x_rtc *rtc = dev_get_drvdata(dev); 125dc59ed38SLaxman Dewangan 126dc59ed38SLaxman Dewangan if (enabled && !rtc->irq_en) { 127dc59ed38SLaxman Dewangan enable_irq(rtc->irq); 128dc59ed38SLaxman Dewangan rtc->irq_en = true; 129dc59ed38SLaxman Dewangan } else if (!enabled && rtc->irq_en) { 130dc59ed38SLaxman Dewangan disable_irq(rtc->irq); 131dc59ed38SLaxman Dewangan rtc->irq_en = false; 132dc59ed38SLaxman Dewangan } 133dc59ed38SLaxman Dewangan return 0; 134dc59ed38SLaxman Dewangan } 135dc59ed38SLaxman Dewangan 136dc59ed38SLaxman Dewangan static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 137dc59ed38SLaxman Dewangan { 138dc59ed38SLaxman Dewangan struct device *tps_dev = to_tps6586x_dev(dev); 1397982df86SArnd Bergmann time64_t seconds; 140dc59ed38SLaxman Dewangan unsigned long ticks; 141dc59ed38SLaxman Dewangan unsigned long rtc_current_time; 142dc59ed38SLaxman Dewangan unsigned long long rticks = 0; 143dc59ed38SLaxman Dewangan u8 buff[3]; 144dc59ed38SLaxman Dewangan u8 rbuff[6]; 145dc59ed38SLaxman Dewangan int ret; 146dc59ed38SLaxman Dewangan int i; 147dc59ed38SLaxman Dewangan 1487982df86SArnd Bergmann seconds = rtc_tm_to_time64(&alrm->time); 149dc59ed38SLaxman Dewangan 150dc59ed38SLaxman Dewangan ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled); 151dc59ed38SLaxman Dewangan if (ret < 0) { 152dc59ed38SLaxman Dewangan dev_err(dev, "can't set alarm irq, err %d\n", ret); 153dc59ed38SLaxman Dewangan return ret; 154dc59ed38SLaxman Dewangan } 155dc59ed38SLaxman Dewangan 156dc59ed38SLaxman Dewangan ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, 157dc59ed38SLaxman Dewangan sizeof(rbuff), rbuff); 158dc59ed38SLaxman Dewangan if (ret < 0) { 159dc59ed38SLaxman Dewangan dev_err(dev, "read counter failed with err %d\n", ret); 160dc59ed38SLaxman Dewangan return ret; 161dc59ed38SLaxman Dewangan } 162dc59ed38SLaxman Dewangan 163dc59ed38SLaxman Dewangan for (i = 1; i < sizeof(rbuff); i++) { 164dc59ed38SLaxman Dewangan rticks <<= 8; 165dc59ed38SLaxman Dewangan rticks |= rbuff[i]; 166dc59ed38SLaxman Dewangan } 167dc59ed38SLaxman Dewangan 168dc59ed38SLaxman Dewangan rtc_current_time = rticks >> 10; 169dc59ed38SLaxman Dewangan if ((seconds - rtc_current_time) > ALM1_VALID_RANGE_IN_SEC) 170dc59ed38SLaxman Dewangan seconds = rtc_current_time - 1; 171dc59ed38SLaxman Dewangan 172dc59ed38SLaxman Dewangan ticks = (unsigned long long)seconds << 10; 173dc59ed38SLaxman Dewangan buff[0] = (ticks >> 16) & 0xff; 174dc59ed38SLaxman Dewangan buff[1] = (ticks >> 8) & 0xff; 175dc59ed38SLaxman Dewangan buff[2] = ticks & 0xff; 176dc59ed38SLaxman Dewangan 177dc59ed38SLaxman Dewangan ret = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff); 178dc59ed38SLaxman Dewangan if (ret) 179dc59ed38SLaxman Dewangan dev_err(dev, "programming alarm failed with err %d\n", ret); 180dc59ed38SLaxman Dewangan 181dc59ed38SLaxman Dewangan return ret; 182dc59ed38SLaxman Dewangan } 183dc59ed38SLaxman Dewangan 184dc59ed38SLaxman Dewangan static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 185dc59ed38SLaxman Dewangan { 186dc59ed38SLaxman Dewangan struct device *tps_dev = to_tps6586x_dev(dev); 187dc59ed38SLaxman Dewangan unsigned long ticks; 1887982df86SArnd Bergmann time64_t seconds; 189dc59ed38SLaxman Dewangan u8 buff[3]; 190dc59ed38SLaxman Dewangan int ret; 191dc59ed38SLaxman Dewangan 192dc59ed38SLaxman Dewangan ret = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff); 193dc59ed38SLaxman Dewangan if (ret) { 194dc59ed38SLaxman Dewangan dev_err(dev, "read RTC_ALARM1_HI failed with err %d\n", ret); 195dc59ed38SLaxman Dewangan return ret; 196dc59ed38SLaxman Dewangan } 197dc59ed38SLaxman Dewangan 198dc59ed38SLaxman Dewangan ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2]; 199dc59ed38SLaxman Dewangan seconds = ticks >> 10; 200dc59ed38SLaxman Dewangan 2017982df86SArnd Bergmann rtc_time64_to_tm(seconds, &alrm->time); 202dc59ed38SLaxman Dewangan return 0; 203dc59ed38SLaxman Dewangan } 204dc59ed38SLaxman Dewangan 205dc59ed38SLaxman Dewangan static const struct rtc_class_ops tps6586x_rtc_ops = { 206dc59ed38SLaxman Dewangan .read_time = tps6586x_rtc_read_time, 207dc59ed38SLaxman Dewangan .set_time = tps6586x_rtc_set_time, 208dc59ed38SLaxman Dewangan .set_alarm = tps6586x_rtc_set_alarm, 209dc59ed38SLaxman Dewangan .read_alarm = tps6586x_rtc_read_alarm, 210dc59ed38SLaxman Dewangan .alarm_irq_enable = tps6586x_rtc_alarm_irq_enable, 211dc59ed38SLaxman Dewangan }; 212dc59ed38SLaxman Dewangan 213dc59ed38SLaxman Dewangan static irqreturn_t tps6586x_rtc_irq(int irq, void *data) 214dc59ed38SLaxman Dewangan { 215dc59ed38SLaxman Dewangan struct tps6586x_rtc *rtc = data; 216dc59ed38SLaxman Dewangan 217dc59ed38SLaxman Dewangan rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); 218dc59ed38SLaxman Dewangan return IRQ_HANDLED; 219dc59ed38SLaxman Dewangan } 220dc59ed38SLaxman Dewangan 221dc59ed38SLaxman Dewangan static int tps6586x_rtc_probe(struct platform_device *pdev) 222dc59ed38SLaxman Dewangan { 223dc59ed38SLaxman Dewangan struct device *tps_dev = to_tps6586x_dev(&pdev->dev); 224dc59ed38SLaxman Dewangan struct tps6586x_rtc *rtc; 225dc59ed38SLaxman Dewangan int ret; 226dc59ed38SLaxman Dewangan 227dc59ed38SLaxman Dewangan rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); 228dc59ed38SLaxman Dewangan if (!rtc) 229dc59ed38SLaxman Dewangan return -ENOMEM; 230dc59ed38SLaxman Dewangan 231dc59ed38SLaxman Dewangan rtc->dev = &pdev->dev; 232dc59ed38SLaxman Dewangan rtc->irq = platform_get_irq(pdev, 0); 233dc59ed38SLaxman Dewangan 234dc59ed38SLaxman Dewangan /* 1 kHz tick mode, enable tick counting */ 235dc59ed38SLaxman Dewangan ret = tps6586x_update(tps_dev, RTC_CTRL, 236dc59ed38SLaxman Dewangan RTC_ENABLE | OSC_SRC_SEL | 237dc59ed38SLaxman Dewangan ((TPS6586X_RTC_CL_SEL_1_5PF << CL_SEL_POS) & CL_SEL_MASK), 238dc59ed38SLaxman Dewangan RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK); 239dc59ed38SLaxman Dewangan if (ret < 0) { 240dc59ed38SLaxman Dewangan dev_err(&pdev->dev, "unable to start counter\n"); 241dc59ed38SLaxman Dewangan return ret; 242dc59ed38SLaxman Dewangan } 243dc59ed38SLaxman Dewangan 2445a280844SDmitry Osipenko device_init_wakeup(&pdev->dev, 1); 2455a280844SDmitry Osipenko 246dc59ed38SLaxman Dewangan platform_set_drvdata(pdev, rtc); 24763d22063SAlexandre Belloni rtc->rtc = devm_rtc_allocate_device(&pdev->dev); 248dc59ed38SLaxman Dewangan if (IS_ERR(rtc->rtc)) { 249dc59ed38SLaxman Dewangan ret = PTR_ERR(rtc->rtc); 250dc59ed38SLaxman Dewangan goto fail_rtc_register; 251dc59ed38SLaxman Dewangan } 252dc59ed38SLaxman Dewangan 25363d22063SAlexandre Belloni rtc->rtc->ops = &tps6586x_rtc_ops; 254180c92c4SAlexandre Belloni rtc->rtc->range_max = (1ULL << 30) - 1; /* 30-bit seconds */ 255180c92c4SAlexandre Belloni rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0); 256180c92c4SAlexandre Belloni rtc->rtc->set_start_time = true; 25763d22063SAlexandre Belloni 2584c4ab451SDmitry Osipenko irq_set_status_flags(rtc->irq, IRQ_NOAUTOEN); 2594c4ab451SDmitry Osipenko 260190ab4afSJingoo Han ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, 261190ab4afSJingoo Han tps6586x_rtc_irq, 262aa1e8069SGrygorii Strashko IRQF_ONESHOT, 263dc59ed38SLaxman Dewangan dev_name(&pdev->dev), rtc); 264dc59ed38SLaxman Dewangan if (ret < 0) { 265dc59ed38SLaxman Dewangan dev_err(&pdev->dev, "request IRQ(%d) failed with ret %d\n", 266dc59ed38SLaxman Dewangan rtc->irq, ret); 267ad3f3cf4SSachin Kamat goto fail_rtc_register; 268dc59ed38SLaxman Dewangan } 26963d22063SAlexandre Belloni 270fdcfd854SBartosz Golaszewski ret = devm_rtc_register_device(rtc->rtc); 27144c638ceSAlexandre Belloni if (ret) 27263d22063SAlexandre Belloni goto fail_rtc_register; 27363d22063SAlexandre Belloni 274dc59ed38SLaxman Dewangan return 0; 275dc59ed38SLaxman Dewangan 276dc59ed38SLaxman Dewangan fail_rtc_register: 277dc59ed38SLaxman Dewangan tps6586x_update(tps_dev, RTC_CTRL, 0, 278dc59ed38SLaxman Dewangan RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK); 279dc59ed38SLaxman Dewangan return ret; 280dc59ed38SLaxman Dewangan }; 281dc59ed38SLaxman Dewangan 282*adebcc1cSUwe Kleine-König static void tps6586x_rtc_remove(struct platform_device *pdev) 283dc59ed38SLaxman Dewangan { 284dc59ed38SLaxman Dewangan struct device *tps_dev = to_tps6586x_dev(&pdev->dev); 285dc59ed38SLaxman Dewangan 286dc59ed38SLaxman Dewangan tps6586x_update(tps_dev, RTC_CTRL, 0, 287dc59ed38SLaxman Dewangan RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK); 288dc59ed38SLaxman Dewangan } 289dc59ed38SLaxman Dewangan 290dc59ed38SLaxman Dewangan #ifdef CONFIG_PM_SLEEP 291dc59ed38SLaxman Dewangan static int tps6586x_rtc_suspend(struct device *dev) 292dc59ed38SLaxman Dewangan { 293dc59ed38SLaxman Dewangan struct tps6586x_rtc *rtc = dev_get_drvdata(dev); 294dc59ed38SLaxman Dewangan 295dc59ed38SLaxman Dewangan if (device_may_wakeup(dev)) 296dc59ed38SLaxman Dewangan enable_irq_wake(rtc->irq); 297dc59ed38SLaxman Dewangan return 0; 298dc59ed38SLaxman Dewangan } 299dc59ed38SLaxman Dewangan 300dc59ed38SLaxman Dewangan static int tps6586x_rtc_resume(struct device *dev) 301dc59ed38SLaxman Dewangan { 302dc59ed38SLaxman Dewangan struct tps6586x_rtc *rtc = dev_get_drvdata(dev); 303dc59ed38SLaxman Dewangan 304dc59ed38SLaxman Dewangan if (device_may_wakeup(dev)) 305dc59ed38SLaxman Dewangan disable_irq_wake(rtc->irq); 306dc59ed38SLaxman Dewangan return 0; 307dc59ed38SLaxman Dewangan } 308dc59ed38SLaxman Dewangan #endif 309dc59ed38SLaxman Dewangan 3108070d053SJingoo Han static SIMPLE_DEV_PM_OPS(tps6586x_pm_ops, tps6586x_rtc_suspend, 3118070d053SJingoo Han tps6586x_rtc_resume); 312dc59ed38SLaxman Dewangan 313dc59ed38SLaxman Dewangan static struct platform_driver tps6586x_rtc_driver = { 314dc59ed38SLaxman Dewangan .driver = { 315dc59ed38SLaxman Dewangan .name = "tps6586x-rtc", 316dc59ed38SLaxman Dewangan .pm = &tps6586x_pm_ops, 317dc59ed38SLaxman Dewangan }, 318dc59ed38SLaxman Dewangan .probe = tps6586x_rtc_probe, 319*adebcc1cSUwe Kleine-König .remove_new = tps6586x_rtc_remove, 320dc59ed38SLaxman Dewangan }; 321dc59ed38SLaxman Dewangan module_platform_driver(tps6586x_rtc_driver); 322dc59ed38SLaxman Dewangan 323b9ba1eb0SNicolas Chauvet MODULE_ALIAS("platform:tps6586x-rtc"); 324dc59ed38SLaxman Dewangan MODULE_DESCRIPTION("TI TPS6586x RTC driver"); 325dc59ed38SLaxman Dewangan MODULE_AUTHOR("Laxman dewangan <ldewangan@nvidia.com>"); 326dc59ed38SLaxman Dewangan MODULE_LICENSE("GPL v2"); 327