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