/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Definitions for the registers , addresses , and platform data of the
* DS1685 / DS1687 - series RTC chips .
*
* This Driver also works for the DS17X85 / DS17X87 RTC chips . Functionally
* similar to the DS1685 / DS1687 , they support a few extra features which
* include larger , battery - backed NV - SRAM , burst - mode access , and an RTC
* write counter .
*
* Copyright ( C ) 2011 - 2014 Joshua Kinard < linux @ kumba . dev > .
* Copyright ( C ) 2009 Matthias Fuchs < matthias . fuchs @ esd - electronics . com > .
*
* References :
* DS1685 / DS1687 3 V / 5 V Real - Time Clocks , 19 - 5215 , Rev 4 / 10 .
* DS17x85 / DS17x87 3 V / 5 V Real - Time Clocks , 19 - 5222 , Rev 4 / 10 .
* DS1689 / DS1693 3 V / 5 V Serialized Real - Time Clocks , Rev 112105 .
* Application Note 90 , Using the Multiplex Bus RTC Extended Features .
*/
#ifndef _LINUX_RTC_DS1685_H_
#define _LINUX_RTC_DS1685_H_
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
/**
* struct ds1685_priv - DS1685 private data structure .
* @ dev : pointer to the rtc_device structure .
* @ regs : iomapped base address pointer of the RTC registers .
* @ regstep : padding / step size between registers ( optional ) .
* @ baseaddr : base address of the RTC device .
* @ size : resource size .
* @ lock : private lock variable for spin locking / unlocking .
* @ work : private workqueue .
* @ irq : IRQ number assigned to the RTC device .
* @ prepare_poweroff : pointer to platform pre - poweroff function .
* @ wake_alarm : pointer to platform wake alarm function .
* @ post_ram_clear : pointer to platform post ram - clear function .
*/
struct ds1685_priv {
struct rtc_device *dev;
void __iomem *regs;
void __iomem *data;
u32 regstep;
int irq_num;
bool bcd_mode;
u8 (*read)(struct ds1685_priv *, int );
void (*write)(struct ds1685_priv *, int , u8);
void (*prepare_poweroff)(void );
void (*wake_alarm)(void );
void (*post_ram_clear)(void );
};
/**
* struct ds1685_rtc_platform_data - platform data structure .
* @ plat_prepare_poweroff : platform - specific pre - poweroff function .
* @ plat_wake_alarm : platform - specific wake alarm function .
* @ plat_post_ram_clear : platform - specific post ram - clear function .
*
* If your platform needs to use a custom padding / step size between
* registers , or uses one or more of the extended interrupts and needs special
* handling , then include this header file in your platform definition and
* set regstep and the plat_ * pointers as appropriate .
*/
struct ds1685_rtc_platform_data {
const u32 regstep;
const bool bcd_mode;
const bool no_irq;
const bool uie_unsupported;
void (*plat_prepare_poweroff)(void );
void (*plat_wake_alarm)(void );
void (*plat_post_ram_clear)(void );
enum {
ds1685_reg_direct,
ds1685_reg_indirect
} access_type;
};
/*
* Time Registers .
*/
#define RTC_SECS 0 x00 /* Seconds 00-59 */
#define RTC_SECS_ALARM 0 x01 /* Alarm Seconds 00-59 */
#define RTC_MINS 0 x02 /* Minutes 00-59 */
#define RTC_MINS_ALARM 0 x03 /* Alarm Minutes 00-59 */
#define RTC_HRS 0 x04 /* Hours 01-12 AM/PM || 00-23 */
#define RTC_HRS_ALARM 0 x05 /* Alarm Hours 01-12 AM/PM || 00-23 */
#define RTC_WDAY 0 x06 /* Day of Week 01-07 */
#define RTC_MDAY 0 x07 /* Day of Month 01-31 */
#define RTC_MONTH 0 x08 /* Month 01-12 */
#define RTC_YEAR 0 x09 /* Year 00-99 */
#define RTC_CENTURY 0 x48 /* Century 00-99 */
#define RTC_MDAY_ALARM 0 x49 /* Alarm Day of Month 01-31 */
/*
* Bit masks for the Time registers in BCD Mode ( DM = 0 ) .
*/
#define RTC_SECS_BCD_MASK 0 x7f /* - x x x x x x x */
#define RTC_MINS_BCD_MASK 0 x7f /* - x x x x x x x */
#define RTC_HRS_12_BCD_MASK 0 x1f /* - - - x x x x x */
#define RTC_HRS_24_BCD_MASK 0 x3f /* - - x x x x x x */
#define RTC_MDAY_BCD_MASK 0 x3f /* - - x x x x x x */
#define RTC_MONTH_BCD_MASK 0 x1f /* - - - x x x x x */
#define RTC_YEAR_BCD_MASK 0 xff /* x x x x x x x x */
/*
* Bit masks for the Time registers in BIN Mode ( DM = 1 ) .
*/
#define RTC_SECS_BIN_MASK 0 x3f /* - - x x x x x x */
#define RTC_MINS_BIN_MASK 0 x3f /* - - x x x x x x */
#define RTC_HRS_12_BIN_MASK 0 x0f /* - - - - x x x x */
#define RTC_HRS_24_BIN_MASK 0 x1f /* - - - x x x x x */
#define RTC_MDAY_BIN_MASK 0 x1f /* - - - x x x x x */
#define RTC_MONTH_BIN_MASK 0 x0f /* - - - - x x x x */
#define RTC_YEAR_BIN_MASK 0 x7f /* - x x x x x x x */
/*
* Bit masks common for the Time registers in BCD or BIN Mode .
*/
#define RTC_WDAY_MASK 0 x07 /* - - - - - x x x */
#define RTC_CENTURY_MASK 0 xff /* x x x x x x x x */
#define RTC_MDAY_ALARM_MASK 0 xff /* x x x x x x x x */
#define RTC_HRS_AMPM_MASK BIT(7 ) /* Mask for the AM/PM bit */
/*
* Control Registers .
*/
#define RTC_CTRL_A 0 x0a /* Control Register A */
#define RTC_CTRL_B 0 x0b /* Control Register B */
#define RTC_CTRL_C 0 x0c /* Control Register C */
#define RTC_CTRL_D 0 x0d /* Control Register D */
#define RTC_EXT_CTRL_4A 0 x4a /* Extended Control Register 4A */
#define RTC_EXT_CTRL_4B 0 x4b /* Extended Control Register 4B */
/*
* Bit names in Control Register A .
*/
#define RTC_CTRL_A_UIP BIT(7 ) /* Update In Progress */
#define RTC_CTRL_A_DV2 BIT(6 ) /* Countdown Chain */
#define RTC_CTRL_A_DV1 BIT(5 ) /* Oscillator Enable */
#define RTC_CTRL_A_DV0 BIT(4 ) /* Bank Select */
#define RTC_CTRL_A_RS2 BIT(2 ) /* Rate-Selection Bit 2 */
#define RTC_CTRL_A_RS3 BIT(3 ) /* Rate-Selection Bit 3 */
#define RTC_CTRL_A_RS1 BIT(1 ) /* Rate-Selection Bit 1 */
#define RTC_CTRL_A_RS0 BIT(0 ) /* Rate-Selection Bit 0 */
#define RTC_CTRL_A_RS_MASK 0 x0f /* RS3 + RS2 + RS1 + RS0 */
/*
* Bit names in Control Register B .
*/
#define RTC_CTRL_B_SET BIT(7 ) /* SET Bit */
#define RTC_CTRL_B_PIE BIT(6 ) /* Periodic-Interrupt Enable */
#define RTC_CTRL_B_AIE BIT(5 ) /* Alarm-Interrupt Enable */
#define RTC_CTRL_B_UIE BIT(4 ) /* Update-Ended Interrupt-Enable */
#define RTC_CTRL_B_SQWE BIT(3 ) /* Square-Wave Enable */
#define RTC_CTRL_B_DM BIT(2 ) /* Data Mode */
#define RTC_CTRL_B_2412 BIT(1 ) /* 12-Hr/24-Hr Mode */
#define RTC_CTRL_B_DSE BIT(0 ) /* Daylight Savings Enable */
#define RTC_CTRL_B_PAU_MASK 0 x70 /* PIE + AIE + UIE */
/*
* Bit names in Control Register C .
*
* BIT ( 0 ) , BIT ( 1 ) , BIT ( 2 ) , & BIT ( 3 ) are unused , always return 0 , and cannot
* be written to .
*/
#define RTC_CTRL_C_IRQF BIT(7 ) /* Interrupt-Request Flag */
#define RTC_CTRL_C_PF BIT(6 ) /* Periodic-Interrupt Flag */
#define RTC_CTRL_C_AF BIT(5 ) /* Alarm-Interrupt Flag */
#define RTC_CTRL_C_UF BIT(4 ) /* Update-Ended Interrupt Flag */
#define RTC_CTRL_C_PAU_MASK 0 x70 /* PF + AF + UF */
/*
* Bit names in Control Register D .
*
* BIT ( 0 ) through BIT ( 6 ) are unused , always return 0 , and cannot
* be written to .
*/
#define RTC_CTRL_D_VRT BIT(7 ) /* Valid RAM and Time */
/*
* Bit names in Extended Control Register 4 A .
*
* On the DS1685 / DS1687 / DS1689 / DS1693 , BIT ( 4 ) and BIT ( 5 ) are reserved for
* future use . They can be read from and written to , but have no effect
* on the RTC ' s operation .
*
* On the DS17x85 / DS17x87 , BIT ( 5 ) is Burst - Mode Enable ( BME ) , and allows
* access to the extended NV - SRAM by automatically incrementing the address
* register when they are read from or written to .
*/
#define RTC_CTRL_4A_VRT2 BIT(7 ) /* Auxillary Battery Status */
#define RTC_CTRL_4A_INCR BIT(6 ) /* Increment-in-Progress Status */
#define RTC_CTRL_4A_PAB BIT(3 ) /* Power-Active Bar Control */
#define RTC_CTRL_4A_RF BIT(2 ) /* RAM-Clear Flag */
#define RTC_CTRL_4A_WF BIT(1 ) /* Wake-Up Alarm Flag */
#define RTC_CTRL_4A_KF BIT(0 ) /* Kickstart Flag */
#if !defined (CONFIG_RTC_DRV_DS1685) && !defined (CONFIG_RTC_DRV_DS1689)
#define RTC_CTRL_4A_BME BIT(5 ) /* Burst-Mode Enable */
#endif
#define RTC_CTRL_4A_RWK_MASK 0 x07 /* RF + WF + KF */
/*
* Bit names in Extended Control Register 4 B .
*/
#define RTC_CTRL_4B_ABE BIT(7 ) /* Auxillary Battery Enable */
#define RTC_CTRL_4B_E32K BIT(6 ) /* Enable 32.768Hz on SQW Pin */
#define RTC_CTRL_4B_CS BIT(5 ) /* Crystal Select */
#define RTC_CTRL_4B_RCE BIT(4 ) /* RAM Clear-Enable */
#define RTC_CTRL_4B_PRS BIT(3 ) /* PAB Reset-Select */
#define RTC_CTRL_4B_RIE BIT(2 ) /* RAM Clear-Interrupt Enable */
#define RTC_CTRL_4B_WIE BIT(1 ) /* Wake-Up Alarm-Interrupt Enable */
#define RTC_CTRL_4B_KSE BIT(0 ) /* Kickstart Interrupt-Enable */
#define RTC_CTRL_4B_RWK_MASK 0 x07 /* RIE + WIE + KSE */
/*
* Misc register names in Bank 1 .
*
* The DV0 bit in Control Register A must be set to 1 for these registers
* to become available , including Extended Control Registers 4 A & 4 B .
*/
#define RTC_BANK1_SSN_MODEL 0 x40 /* Model Number */
#define RTC_BANK1_SSN_BYTE_1 0 x41 /* 1st Byte of Serial Number */
#define RTC_BANK1_SSN_BYTE_2 0 x42 /* 2nd Byte of Serial Number */
#define RTC_BANK1_SSN_BYTE_3 0 x43 /* 3rd Byte of Serial Number */
#define RTC_BANK1_SSN_BYTE_4 0 x44 /* 4th Byte of Serial Number */
#define RTC_BANK1_SSN_BYTE_5 0 x45 /* 5th Byte of Serial Number */
#define RTC_BANK1_SSN_BYTE_6 0 x46 /* 6th Byte of Serial Number */
#define RTC_BANK1_SSN_CRC 0 x47 /* Serial CRC Byte */
#define RTC_BANK1_RAM_DATA_PORT 0 x53 /* Extended RAM Data Port */
/*
* Model - specific registers in Bank 1 .
*
* The addresses below differ depending on the model of the RTC chip
* selected in the kernel configuration . Not all of these features are
* supported in the main driver at present .
*
* DS1685 / DS1687 - Extended NV - SRAM address ( LSB only ) .
* DS1689 / DS1693 - Vcc , Vbat , Pwr Cycle Counters & Customer - specific S / N .
* DS17x85 / DS17x87 - Extended NV - SRAM addresses ( MSB & LSB ) & Write counter .
*/
#if defined (CONFIG_RTC_DRV_DS1685)
#define RTC_BANK1_RAM_ADDR 0 x50 /* NV-SRAM Addr */
#elif defined (CONFIG_RTC_DRV_DS1689)
#define RTC_BANK1_VCC_CTR_LSB 0 x54 /* Vcc Counter Addr (LSB) */
#define RTC_BANK1_VCC_CTR_MSB 0 x57 /* Vcc Counter Addr (MSB) */
#define RTC_BANK1_VBAT_CTR_LSB 0 x58 /* Vbat Counter Addr (LSB) */
#define RTC_BANK1_VBAT_CTR_MSB 0 x5b /* Vbat Counter Addr (MSB) */
#define RTC_BANK1_PWR_CTR_LSB 0 x5c /* Pwr Cycle Counter Addr (LSB) */
#define RTC_BANK1_PWR_CTR_MSB 0 x5d /* Pwr Cycle Counter Addr (MSB) */
#define RTC_BANK1_UNIQ_SN 0 x60 /* Customer-specific S/N */
#else /* DS17x85/DS17x87 */
#define RTC_BANK1_RAM_ADDR_LSB 0 x50 /* NV-SRAM Addr (LSB) */
#define RTC_BANK1_RAM_ADDR_MSB 0 x51 /* NV-SRAM Addr (MSB) */
#define RTC_BANK1_WRITE_CTR 0 x5e /* RTC Write Counter */
#endif
/*
* Model numbers .
*
* The DS1688 / DS1691 and DS1689 / DS1693 chips share the same model number
* and the manual doesn ' t indicate any major differences . As such , they
* are regarded as the same chip in this driver .
*/
#define RTC_MODEL_DS1685 0 x71 /* DS1685/DS1687 */
#define RTC_MODEL_DS17285 0 x72 /* DS17285/DS17287 */
#define RTC_MODEL_DS1689 0 x73 /* DS1688/DS1691/DS1689/DS1693 */
#define RTC_MODEL_DS17485 0 x74 /* DS17485/DS17487 */
#define RTC_MODEL_DS17885 0 x78 /* DS17885/DS17887 */
/*
* Periodic Interrupt Rates / Square - Wave Output Frequency
*
* Periodic rates are selected by setting the RS3 - RS0 bits in Control
* Register A and enabled via either the E32K bit in Extended Control
* Register 4 B or the SQWE bit in Control Register B .
*
* E32K overrides the settings of RS3 - RS0 and outputs a frequency of 32768 Hz
* on the SQW pin of the RTC chip . While there are 16 possible selections ,
* the 1 - of - 16 decoder is only able to divide the base 32768 Hz signal into 13
* smaller frequencies . The values 0 x01 and 0 x02 are not used and are
* synonymous with 0 x08 and 0 x09 , respectively .
*
* When E32K is set to a logic 1 , periodic interrupts are disabled and reading
* / dev / rtc will return - EINVAL . This also applies if the periodic interrupt
* frequency is set to 0 Hz .
*
* Not currently used by the rtc - ds1685 driver because the RTC core removed
* support for hardware - generated periodic - interrupts in favour of
* hrtimer - generated interrupts . But these defines are kept around for use
* in userland , as documentation to the hardware , and possible future use if
* hardware - generated periodic interrupts are ever added back .
*/
/* E32K RS3 RS2 RS1 RS0 */
#define RTC_SQW_8192HZ 0 x03 /* 0 0 0 1 1 */
#define RTC_SQW_4096HZ 0 x04 /* 0 0 1 0 0 */
#define RTC_SQW_2048HZ 0 x05 /* 0 0 1 0 1 */
#define RTC_SQW_1024HZ 0 x06 /* 0 0 1 1 0 */
#define RTC_SQW_512HZ 0 x07 /* 0 0 1 1 1 */
#define RTC_SQW_256HZ 0 x08 /* 0 1 0 0 0 */
#define RTC_SQW_128HZ 0 x09 /* 0 1 0 0 1 */
#define RTC_SQW_64HZ 0 x0a /* 0 1 0 1 0 */
#define RTC_SQW_32HZ 0 x0b /* 0 1 0 1 1 */
#define RTC_SQW_16HZ 0 x0c /* 0 1 1 0 0 */
#define RTC_SQW_8HZ 0 x0d /* 0 1 1 0 1 */
#define RTC_SQW_4HZ 0 x0e /* 0 1 1 1 0 */
#define RTC_SQW_2HZ 0 x0f /* 0 1 1 1 1 */
#define RTC_SQW_0HZ 0 x00 /* 0 0 0 0 0 */
#define RTC_SQW_32768HZ 32768 /* 1 - - - - */
#define RTC_MAX_USER_FREQ 8192
/*
* NVRAM data & addresses :
* - 50 bytes of NVRAM are available just past the clock registers .
* - 64 additional bytes are available in Bank0 .
*
* Extended , battery - backed NV - SRAM :
* - DS1685 / DS1687 - 128 bytes .
* - DS1689 / DS1693 - 0 bytes .
* - DS17285 / DS17287 - 2048 bytes .
* - DS17485 / DS17487 - 4096 bytes .
* - DS17885 / DS17887 - 8192 bytes .
*/
#define NVRAM_TIME_BASE 0 x0e /* NVRAM Addr in Time regs */
#define NVRAM_BANK0_BASE 0 x40 /* NVRAM Addr in Bank0 regs */
#define NVRAM_SZ_TIME 50
#define NVRAM_SZ_BANK0 64
#if defined (CONFIG_RTC_DRV_DS1685)
# define NVRAM_SZ_EXTND 128
#elif defined (CONFIG_RTC_DRV_DS1689)
# define NVRAM_SZ_EXTND 0
#elif defined (CONFIG_RTC_DRV_DS17285)
# define NVRAM_SZ_EXTND 2048
#elif defined (CONFIG_RTC_DRV_DS17485)
# define NVRAM_SZ_EXTND 4096
#elif defined (CONFIG_RTC_DRV_DS17885)
# define NVRAM_SZ_EXTND 8192
#endif
#define NVRAM_TOTAL_SZ_BANK0 (NVRAM_SZ_TIME + NVRAM_SZ_BANK0)
#define NVRAM_TOTAL_SZ (NVRAM_TOTAL_SZ_BANK0 + NVRAM_SZ_EXTND)
/*
* Function Prototypes .
*/
extern void __noreturn
ds1685_rtc_poweroff(struct platform_device *pdev);
#endif /* _LINUX_RTC_DS1685_H_ */
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