linux/mfd/gsc.h

0001 /* SPDX-License-Identifier: GPL-2.0
0002  *
0003  * Copyright (C) 2020 Gateworks Corporation
0004  */
0005 #ifndef __LINUX_MFD_GSC_H_
0006 #define __LINUX_MFD_GSC_H_
0007
0008 #include <linux/regmap.h>
0009
0010 /* Device Addresses */
0011 #define GSC_MISC    0x20
0012 #define GSC_UPDATE  0x21
0013 #define GSC_GPIO    0x23
0014 #define GSC_HWMON   0x29
0015 #define GSC_EEPROM0 0x50
0016 #define GSC_EEPROM1 0x51
0017 #define GSC_EEPROM2 0x52
0018 #define GSC_EEPROM3 0x53
0019 #define GSC_RTC     0x68
0020
0021 /* Register offsets */
0022 enum {
0023     GSC_CTRL_0  = 0x00,
0024     GSC_CTRL_1  = 0x01,
0025     GSC_TIME    = 0x02,
0026     GSC_TIME_ADD    = 0x06,
0027     GSC_IRQ_STATUS  = 0x0A,
0028     GSC_IRQ_ENABLE  = 0x0B,
0029     GSC_FW_CRC  = 0x0C,
0030     GSC_FW_VER  = 0x0E,
0031     GSC_WP      = 0x0F,
0032 };
0033
0034 /* Bit definitions */
0035 #define GSC_CTRL_0_PB_HARD_RESET    0
0036 #define GSC_CTRL_0_PB_CLEAR_SECURE_KEY  1
0037 #define GSC_CTRL_0_PB_SOFT_POWER_DOWN   2
0038 #define GSC_CTRL_0_PB_BOOT_ALTERNATE    3
0039 #define GSC_CTRL_0_PERFORM_CRC      4
0040 #define GSC_CTRL_0_TAMPER_DETECT    5
0041 #define GSC_CTRL_0_SWITCH_HOLD      6
0042
0043 #define GSC_CTRL_1_SLEEP_ENABLE     0
0044 #define GSC_CTRL_1_SLEEP_ACTIVATE   1
0045 #define GSC_CTRL_1_SLEEP_ADD        2
0046 #define GSC_CTRL_1_SLEEP_NOWAKEPB   3
0047 #define GSC_CTRL_1_WDT_TIME     4
0048 #define GSC_CTRL_1_WDT_ENABLE       5
0049 #define GSC_CTRL_1_SWITCH_BOOT_ENABLE   6
0050 #define GSC_CTRL_1_SWITCH_BOOT_CLEAR    7
0051
0052 #define GSC_IRQ_PB          0
0053 #define GSC_IRQ_KEY_ERASED      1
0054 #define GSC_IRQ_EEPROM_WP       2
0055 #define GSC_IRQ_RESV            3
0056 #define GSC_IRQ_GPIO            4
0057 #define GSC_IRQ_TAMPER          5
0058 #define GSC_IRQ_WDT_TIMEOUT     6
0059 #define GSC_IRQ_SWITCH_HOLD     7
0060
0061 int gsc_read(void *context, unsigned int reg, unsigned int *val);
0062 int gsc_write(void *context, unsigned int reg, unsigned int val);
0063
0064 struct gsc_dev {
0065     struct device *dev;
0066
0067     struct i2c_client *i2c;     /* 0x20: interrupt controller, WDT */
0068     struct i2c_client *i2c_hwmon;   /* 0x29: hwmon, fan controller */
0069
0070     struct regmap *regmap;
0071
0072     unsigned int fwver;
0073     unsigned short fwcrc;
0074 };
0075
0076 #endif /* __LINUX_MFD_GSC_H_ */