1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Definitions for the registers, addresses, and platform data of the 4 * DS1685/DS1687-series RTC chips. 5 * 6 * This Driver also works for the DS17X85/DS17X87 RTC chips. Functionally 7 * similar to the DS1685/DS1687, they support a few extra features which 8 * include larger, battery-backed NV-SRAM, burst-mode access, and an RTC 9 * write counter. 10 * 11 * Copyright (C) 2011-2014 Joshua Kinard <kumba@gentoo.org>. 12 * Copyright (C) 2009 Matthias Fuchs <matthias.fuchs@esd-electronics.com>. 13 * 14 * References: 15 * DS1685/DS1687 3V/5V Real-Time Clocks, 19-5215, Rev 4/10. 16 * DS17x85/DS17x87 3V/5V Real-Time Clocks, 19-5222, Rev 4/10. 17 * DS1689/DS1693 3V/5V Serialized Real-Time Clocks, Rev 112105. 18 * Application Note 90, Using the Multiplex Bus RTC Extended Features. 19 */ 20 21#ifndef _LINUX_RTC_DS1685_H_ 22#define _LINUX_RTC_DS1685_H_ 23 24#include <linux/rtc.h> 25#include <linux/platform_device.h> 26#include <linux/workqueue.h> 27 28/** 29 * struct ds1685_priv - DS1685 private data structure. 30 * @dev: pointer to the rtc_device structure. 31 * @regs: iomapped base address pointer of the RTC registers. 32 * @regstep: padding/step size between registers (optional). 33 * @baseaddr: base address of the RTC device. 34 * @size: resource size. 35 * @lock: private lock variable for spin locking/unlocking. 36 * @work: private workqueue. 37 * @irq: IRQ number assigned to the RTC device. 38 * @prepare_poweroff: pointer to platform pre-poweroff function. 39 * @wake_alarm: pointer to platform wake alarm function. 40 * @post_ram_clear: pointer to platform post ram-clear function. 41 */ 42struct ds1685_priv { 43 struct rtc_device *dev; 44 void __iomem *regs; 45 void __iomem *data; 46 u32 regstep; 47 int irq_num; 48 bool bcd_mode; 49 bool no_irq; 50 u8 (*read)(struct ds1685_priv *, int); 51 void (*write)(struct ds1685_priv *, int, u8); 52 void (*prepare_poweroff)(void); 53 void (*wake_alarm)(void); 54 void (*post_ram_clear)(void); 55}; 56 57 58/** 59 * struct ds1685_rtc_platform_data - platform data structure. 60 * @plat_prepare_poweroff: platform-specific pre-poweroff function. 61 * @plat_wake_alarm: platform-specific wake alarm function. 62 * @plat_post_ram_clear: platform-specific post ram-clear function. 63 * 64 * If your platform needs to use a custom padding/step size between 65 * registers, or uses one or more of the extended interrupts and needs special 66 * handling, then include this header file in your platform definition and 67 * set regstep and the plat_* pointers as appropriate. 68 */ 69struct ds1685_rtc_platform_data { 70 const u32 regstep; 71 const bool bcd_mode; 72 const bool no_irq; 73 const bool uie_unsupported; 74 void (*plat_prepare_poweroff)(void); 75 void (*plat_wake_alarm)(void); 76 void (*plat_post_ram_clear)(void); 77 enum { 78 ds1685_reg_direct, 79 ds1685_reg_indirect 80 } access_type; 81}; 82 83 84/* 85 * Time Registers. 86 */ 87#define RTC_SECS 0x00 /* Seconds 00-59 */ 88#define RTC_SECS_ALARM 0x01 /* Alarm Seconds 00-59 */ 89#define RTC_MINS 0x02 /* Minutes 00-59 */ 90#define RTC_MINS_ALARM 0x03 /* Alarm Minutes 00-59 */ 91#define RTC_HRS 0x04 /* Hours 01-12 AM/PM || 00-23 */ 92#define RTC_HRS_ALARM 0x05 /* Alarm Hours 01-12 AM/PM || 00-23 */ 93#define RTC_WDAY 0x06 /* Day of Week 01-07 */ 94#define RTC_MDAY 0x07 /* Day of Month 01-31 */ 95#define RTC_MONTH 0x08 /* Month 01-12 */ 96#define RTC_YEAR 0x09 /* Year 00-99 */ 97#define RTC_CENTURY 0x48 /* Century 00-99 */ 98#define RTC_MDAY_ALARM 0x49 /* Alarm Day of Month 01-31 */ 99 100 101/* 102 * Bit masks for the Time registers in BCD Mode (DM = 0). 103 */ 104#define RTC_SECS_BCD_MASK 0x7f /* - x x x x x x x */ 105#define RTC_MINS_BCD_MASK 0x7f /* - x x x x x x x */ 106#define RTC_HRS_12_BCD_MASK 0x1f /* - - - x x x x x */ 107#define RTC_HRS_24_BCD_MASK 0x3f /* - - x x x x x x */ 108#define RTC_MDAY_BCD_MASK 0x3f /* - - x x x x x x */ 109#define RTC_MONTH_BCD_MASK 0x1f /* - - - x x x x x */ 110#define RTC_YEAR_BCD_MASK 0xff /* x x x x x x x x */ 111 112/* 113 * Bit masks for the Time registers in BIN Mode (DM = 1). 114 */ 115#define RTC_SECS_BIN_MASK 0x3f /* - - x x x x x x */ 116#define RTC_MINS_BIN_MASK 0x3f /* - - x x x x x x */ 117#define RTC_HRS_12_BIN_MASK 0x0f /* - - - - x x x x */ 118#define RTC_HRS_24_BIN_MASK 0x1f /* - - - x x x x x */ 119#define RTC_MDAY_BIN_MASK 0x1f /* - - - x x x x x */ 120#define RTC_MONTH_BIN_MASK 0x0f /* - - - - x x x x */ 121#define RTC_YEAR_BIN_MASK 0x7f /* - x x x x x x x */ 122 123/* 124 * Bit masks common for the Time registers in BCD or BIN Mode. 125 */ 126#define RTC_WDAY_MASK 0x07 /* - - - - - x x x */ 127#define RTC_CENTURY_MASK 0xff /* x x x x x x x x */ 128#define RTC_MDAY_ALARM_MASK 0xff /* x x x x x x x x */ 129#define RTC_HRS_AMPM_MASK BIT(7) /* Mask for the AM/PM bit */ 130 131 132 133/* 134 * Control Registers. 135 */ 136#define RTC_CTRL_A 0x0a /* Control Register A */ 137#define RTC_CTRL_B 0x0b /* Control Register B */ 138#define RTC_CTRL_C 0x0c /* Control Register C */ 139#define RTC_CTRL_D 0x0d /* Control Register D */ 140#define RTC_EXT_CTRL_4A 0x4a /* Extended Control Register 4A */ 141#define RTC_EXT_CTRL_4B 0x4b /* Extended Control Register 4B */ 142 143 144/* 145 * Bit names in Control Register A. 146 */ 147#define RTC_CTRL_A_UIP BIT(7) /* Update In Progress */ 148#define RTC_CTRL_A_DV2 BIT(6) /* Countdown Chain */ 149#define RTC_CTRL_A_DV1 BIT(5) /* Oscillator Enable */ 150#define RTC_CTRL_A_DV0 BIT(4) /* Bank Select */ 151#define RTC_CTRL_A_RS2 BIT(2) /* Rate-Selection Bit 2 */ 152#define RTC_CTRL_A_RS3 BIT(3) /* Rate-Selection Bit 3 */ 153#define RTC_CTRL_A_RS1 BIT(1) /* Rate-Selection Bit 1 */ 154#define RTC_CTRL_A_RS0 BIT(0) /* Rate-Selection Bit 0 */ 155#define RTC_CTRL_A_RS_MASK 0x0f /* RS3 + RS2 + RS1 + RS0 */ 156 157/* 158 * Bit names in Control Register B. 159 */ 160#define RTC_CTRL_B_SET BIT(7) /* SET Bit */ 161#define RTC_CTRL_B_PIE BIT(6) /* Periodic-Interrupt Enable */ 162#define RTC_CTRL_B_AIE BIT(5) /* Alarm-Interrupt Enable */ 163#define RTC_CTRL_B_UIE BIT(4) /* Update-Ended Interrupt-Enable */ 164#define RTC_CTRL_B_SQWE BIT(3) /* Square-Wave Enable */ 165#define RTC_CTRL_B_DM BIT(2) /* Data Mode */ 166#define RTC_CTRL_B_2412 BIT(1) /* 12-Hr/24-Hr Mode */ 167#define RTC_CTRL_B_DSE BIT(0) /* Daylight Savings Enable */ 168#define RTC_CTRL_B_PAU_MASK 0x70 /* PIE + AIE + UIE */ 169 170 171/* 172 * Bit names in Control Register C. 173 * 174 * BIT(0), BIT(1), BIT(2), & BIT(3) are unused, always return 0, and cannot 175 * be written to. 176 */ 177#define RTC_CTRL_C_IRQF BIT(7) /* Interrupt-Request Flag */ 178#define RTC_CTRL_C_PF BIT(6) /* Periodic-Interrupt Flag */ 179#define RTC_CTRL_C_AF BIT(5) /* Alarm-Interrupt Flag */ 180#define RTC_CTRL_C_UF BIT(4) /* Update-Ended Interrupt Flag */ 181#define RTC_CTRL_C_PAU_MASK 0x70 /* PF + AF + UF */ 182 183 184/* 185 * Bit names in Control Register D. 186 * 187 * BIT(0) through BIT(6) are unused, always return 0, and cannot 188 * be written to. 189 */ 190#define RTC_CTRL_D_VRT BIT(7) /* Valid RAM and Time */ 191 192 193/* 194 * Bit names in Extended Control Register 4A. 195 * 196 * On the DS1685/DS1687/DS1689/DS1693, BIT(4) and BIT(5) are reserved for 197 * future use. They can be read from and written to, but have no effect 198 * on the RTC's operation. 199 * 200 * On the DS17x85/DS17x87, BIT(5) is Burst-Mode Enable (BME), and allows 201 * access to the extended NV-SRAM by automatically incrementing the address 202 * register when they are read from or written to. 203 */ 204#define RTC_CTRL_4A_VRT2 BIT(7) /* Auxillary Battery Status */ 205#define RTC_CTRL_4A_INCR BIT(6) /* Increment-in-Progress Status */ 206#define RTC_CTRL_4A_PAB BIT(3) /* Power-Active Bar Control */ 207#define RTC_CTRL_4A_RF BIT(2) /* RAM-Clear Flag */ 208#define RTC_CTRL_4A_WF BIT(1) /* Wake-Up Alarm Flag */ 209#define RTC_CTRL_4A_KF BIT(0) /* Kickstart Flag */ 210#if !defined(CONFIG_RTC_DRV_DS1685) && !defined(CONFIG_RTC_DRV_DS1689) 211#define RTC_CTRL_4A_BME BIT(5) /* Burst-Mode Enable */ 212#endif 213#define RTC_CTRL_4A_RWK_MASK 0x07 /* RF + WF + KF */ 214 215 216/* 217 * Bit names in Extended Control Register 4B. 218 */ 219#define RTC_CTRL_4B_ABE BIT(7) /* Auxillary Battery Enable */ 220#define RTC_CTRL_4B_E32K BIT(6) /* Enable 32.768Hz on SQW Pin */ 221#define RTC_CTRL_4B_CS BIT(5) /* Crystal Select */ 222#define RTC_CTRL_4B_RCE BIT(4) /* RAM Clear-Enable */ 223#define RTC_CTRL_4B_PRS BIT(3) /* PAB Reset-Select */ 224#define RTC_CTRL_4B_RIE BIT(2) /* RAM Clear-Interrupt Enable */ 225#define RTC_CTRL_4B_WIE BIT(1) /* Wake-Up Alarm-Interrupt Enable */ 226#define RTC_CTRL_4B_KSE BIT(0) /* Kickstart Interrupt-Enable */ 227#define RTC_CTRL_4B_RWK_MASK 0x07 /* RIE + WIE + KSE */ 228 229 230/* 231 * Misc register names in Bank 1. 232 * 233 * The DV0 bit in Control Register A must be set to 1 for these registers 234 * to become available, including Extended Control Registers 4A & 4B. 235 */ 236#define RTC_BANK1_SSN_MODEL 0x40 /* Model Number */ 237#define RTC_BANK1_SSN_BYTE_1 0x41 /* 1st Byte of Serial Number */ 238#define RTC_BANK1_SSN_BYTE_2 0x42 /* 2nd Byte of Serial Number */ 239#define RTC_BANK1_SSN_BYTE_3 0x43 /* 3rd Byte of Serial Number */ 240#define RTC_BANK1_SSN_BYTE_4 0x44 /* 4th Byte of Serial Number */ 241#define RTC_BANK1_SSN_BYTE_5 0x45 /* 5th Byte of Serial Number */ 242#define RTC_BANK1_SSN_BYTE_6 0x46 /* 6th Byte of Serial Number */ 243#define RTC_BANK1_SSN_CRC 0x47 /* Serial CRC Byte */ 244#define RTC_BANK1_RAM_DATA_PORT 0x53 /* Extended RAM Data Port */ 245 246 247/* 248 * Model-specific registers in Bank 1. 249 * 250 * The addresses below differ depending on the model of the RTC chip 251 * selected in the kernel configuration. Not all of these features are 252 * supported in the main driver at present. 253 * 254 * DS1685/DS1687 - Extended NV-SRAM address (LSB only). 255 * DS1689/DS1693 - Vcc, Vbat, Pwr Cycle Counters & Customer-specific S/N. 256 * DS17x85/DS17x87 - Extended NV-SRAM addresses (MSB & LSB) & Write counter. 257 */ 258#if defined(CONFIG_RTC_DRV_DS1685) 259#define RTC_BANK1_RAM_ADDR 0x50 /* NV-SRAM Addr */ 260#elif defined(CONFIG_RTC_DRV_DS1689) 261#define RTC_BANK1_VCC_CTR_LSB 0x54 /* Vcc Counter Addr (LSB) */ 262#define RTC_BANK1_VCC_CTR_MSB 0x57 /* Vcc Counter Addr (MSB) */ 263#define RTC_BANK1_VBAT_CTR_LSB 0x58 /* Vbat Counter Addr (LSB) */ 264#define RTC_BANK1_VBAT_CTR_MSB 0x5b /* Vbat Counter Addr (MSB) */ 265#define RTC_BANK1_PWR_CTR_LSB 0x5c /* Pwr Cycle Counter Addr (LSB) */ 266#define RTC_BANK1_PWR_CTR_MSB 0x5d /* Pwr Cycle Counter Addr (MSB) */ 267#define RTC_BANK1_UNIQ_SN 0x60 /* Customer-specific S/N */ 268#else /* DS17x85/DS17x87 */ 269#define RTC_BANK1_RAM_ADDR_LSB 0x50 /* NV-SRAM Addr (LSB) */ 270#define RTC_BANK1_RAM_ADDR_MSB 0x51 /* NV-SRAM Addr (MSB) */ 271#define RTC_BANK1_WRITE_CTR 0x5e /* RTC Write Counter */ 272#endif 273 274 275/* 276 * Model numbers. 277 * 278 * The DS1688/DS1691 and DS1689/DS1693 chips share the same model number 279 * and the manual doesn't indicate any major differences. As such, they 280 * are regarded as the same chip in this driver. 281 */ 282#define RTC_MODEL_DS1685 0x71 /* DS1685/DS1687 */ 283#define RTC_MODEL_DS17285 0x72 /* DS17285/DS17287 */ 284#define RTC_MODEL_DS1689 0x73 /* DS1688/DS1691/DS1689/DS1693 */ 285#define RTC_MODEL_DS17485 0x74 /* DS17485/DS17487 */ 286#define RTC_MODEL_DS17885 0x78 /* DS17885/DS17887 */ 287 288 289/* 290 * Periodic Interrupt Rates / Square-Wave Output Frequency 291 * 292 * Periodic rates are selected by setting the RS3-RS0 bits in Control 293 * Register A and enabled via either the E32K bit in Extended Control 294 * Register 4B or the SQWE bit in Control Register B. 295 * 296 * E32K overrides the settings of RS3-RS0 and outputs a frequency of 32768Hz 297 * on the SQW pin of the RTC chip. While there are 16 possible selections, 298 * the 1-of-16 decoder is only able to divide the base 32768Hz signal into 13 299 * smaller frequencies. The values 0x01 and 0x02 are not used and are 300 * synonymous with 0x08 and 0x09, respectively. 301 * 302 * When E32K is set to a logic 1, periodic interrupts are disabled and reading 303 * /dev/rtc will return -EINVAL. This also applies if the periodic interrupt 304 * frequency is set to 0Hz. 305 * 306 * Not currently used by the rtc-ds1685 driver because the RTC core removed 307 * support for hardware-generated periodic-interrupts in favour of 308 * hrtimer-generated interrupts. But these defines are kept around for use 309 * in userland, as documentation to the hardware, and possible future use if 310 * hardware-generated periodic interrupts are ever added back. 311 */ 312 /* E32K RS3 RS2 RS1 RS0 */ 313#define RTC_SQW_8192HZ 0x03 /* 0 0 0 1 1 */ 314#define RTC_SQW_4096HZ 0x04 /* 0 0 1 0 0 */ 315#define RTC_SQW_2048HZ 0x05 /* 0 0 1 0 1 */ 316#define RTC_SQW_1024HZ 0x06 /* 0 0 1 1 0 */ 317#define RTC_SQW_512HZ 0x07 /* 0 0 1 1 1 */ 318#define RTC_SQW_256HZ 0x08 /* 0 1 0 0 0 */ 319#define RTC_SQW_128HZ 0x09 /* 0 1 0 0 1 */ 320#define RTC_SQW_64HZ 0x0a /* 0 1 0 1 0 */ 321#define RTC_SQW_32HZ 0x0b /* 0 1 0 1 1 */ 322#define RTC_SQW_16HZ 0x0c /* 0 1 1 0 0 */ 323#define RTC_SQW_8HZ 0x0d /* 0 1 1 0 1 */ 324#define RTC_SQW_4HZ 0x0e /* 0 1 1 1 0 */ 325#define RTC_SQW_2HZ 0x0f /* 0 1 1 1 1 */ 326#define RTC_SQW_0HZ 0x00 /* 0 0 0 0 0 */ 327#define RTC_SQW_32768HZ 32768 /* 1 - - - - */ 328#define RTC_MAX_USER_FREQ 8192 329 330 331/* 332 * NVRAM data & addresses: 333 * - 50 bytes of NVRAM are available just past the clock registers. 334 * - 64 additional bytes are available in Bank0. 335 * 336 * Extended, battery-backed NV-SRAM: 337 * - DS1685/DS1687 - 128 bytes. 338 * - DS1689/DS1693 - 0 bytes. 339 * - DS17285/DS17287 - 2048 bytes. 340 * - DS17485/DS17487 - 4096 bytes. 341 * - DS17885/DS17887 - 8192 bytes. 342 */ 343#define NVRAM_TIME_BASE 0x0e /* NVRAM Addr in Time regs */ 344#define NVRAM_BANK0_BASE 0x40 /* NVRAM Addr in Bank0 regs */ 345#define NVRAM_SZ_TIME 50 346#define NVRAM_SZ_BANK0 64 347#if defined(CONFIG_RTC_DRV_DS1685) 348# define NVRAM_SZ_EXTND 128 349#elif defined(CONFIG_RTC_DRV_DS1689) 350# define NVRAM_SZ_EXTND 0 351#elif defined(CONFIG_RTC_DRV_DS17285) 352# define NVRAM_SZ_EXTND 2048 353#elif defined(CONFIG_RTC_DRV_DS17485) 354# define NVRAM_SZ_EXTND 4096 355#elif defined(CONFIG_RTC_DRV_DS17885) 356# define NVRAM_SZ_EXTND 8192 357#endif 358#define NVRAM_TOTAL_SZ_BANK0 (NVRAM_SZ_TIME + NVRAM_SZ_BANK0) 359#define NVRAM_TOTAL_SZ (NVRAM_TOTAL_SZ_BANK0 + NVRAM_SZ_EXTND) 360 361 362/* 363 * Function Prototypes. 364 */ 365extern void __noreturn 366ds1685_rtc_poweroff(struct platform_device *pdev); 367 368#endif /* _LINUX_RTC_DS1685_H_ */ 369