forked from mirrors/linux
d85234994b
The Gateworks System Controller (GSC) is an I2C slave controller implemented with an MSP430 micro-controller whose firmware embeds the following features: - I/O expander (16 GPIO's) using PCA955x protocol - Real Time Clock using DS1672 protocol - User EEPROM using AT24 protocol - HWMON using custom protocol - Interrupt controller with tamper detect, user pushbotton - Watchdog controller capable of full board power-cycle - Power Control capable of full board power-cycle see http://trac.gateworks.com/wiki/gsc for more details Signed-off-by: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2020 Gateworks Corporation
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*/
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#ifndef __LINUX_MFD_GSC_H_
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#define __LINUX_MFD_GSC_H_
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#include <linux/regmap.h>
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/* Device Addresses */
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#define GSC_MISC 0x20
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#define GSC_UPDATE 0x21
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#define GSC_GPIO 0x23
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#define GSC_HWMON 0x29
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#define GSC_EEPROM0 0x50
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#define GSC_EEPROM1 0x51
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#define GSC_EEPROM2 0x52
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#define GSC_EEPROM3 0x53
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#define GSC_RTC 0x68
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/* Register offsets */
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enum {
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GSC_CTRL_0 = 0x00,
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GSC_CTRL_1 = 0x01,
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GSC_TIME = 0x02,
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GSC_TIME_ADD = 0x06,
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GSC_IRQ_STATUS = 0x0A,
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GSC_IRQ_ENABLE = 0x0B,
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GSC_FW_CRC = 0x0C,
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GSC_FW_VER = 0x0E,
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GSC_WP = 0x0F,
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};
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/* Bit definitions */
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#define GSC_CTRL_0_PB_HARD_RESET 0
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#define GSC_CTRL_0_PB_CLEAR_SECURE_KEY 1
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#define GSC_CTRL_0_PB_SOFT_POWER_DOWN 2
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#define GSC_CTRL_0_PB_BOOT_ALTERNATE 3
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#define GSC_CTRL_0_PERFORM_CRC 4
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#define GSC_CTRL_0_TAMPER_DETECT 5
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#define GSC_CTRL_0_SWITCH_HOLD 6
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#define GSC_CTRL_1_SLEEP_ENABLE 0
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#define GSC_CTRL_1_SLEEP_ACTIVATE 1
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#define GSC_CTRL_1_SLEEP_ADD 2
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#define GSC_CTRL_1_SLEEP_NOWAKEPB 3
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#define GSC_CTRL_1_WDT_TIME 4
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#define GSC_CTRL_1_WDT_ENABLE 5
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#define GSC_CTRL_1_SWITCH_BOOT_ENABLE 6
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#define GSC_CTRL_1_SWITCH_BOOT_CLEAR 7
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#define GSC_IRQ_PB 0
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#define GSC_IRQ_KEY_ERASED 1
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#define GSC_IRQ_EEPROM_WP 2
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#define GSC_IRQ_RESV 3
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#define GSC_IRQ_GPIO 4
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#define GSC_IRQ_TAMPER 5
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#define GSC_IRQ_WDT_TIMEOUT 6
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#define GSC_IRQ_SWITCH_HOLD 7
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int gsc_read(void *context, unsigned int reg, unsigned int *val);
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int gsc_write(void *context, unsigned int reg, unsigned int val);
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struct gsc_dev {
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struct device *dev;
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struct i2c_client *i2c; /* 0x20: interrupt controller, WDT */
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struct i2c_client *i2c_hwmon; /* 0x29: hwmon, fan controller */
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struct regmap *regmap;
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unsigned int fwver;
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unsigned short fwcrc;
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};
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#endif /* __LINUX_MFD_GSC_H_ */
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