1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2013 Gateworks Corporation
4  *
5  * Author: Tim Harvey <tharvey@gateworks.com>
6  */
7 
8 #ifndef __ASSEMBLY__
9 
10 /* i2c slave addresses */
11 #define GSC_SC_ADDR		0x20
12 #define GSC_RTC_ADDR		0x68
13 #define GSC_HWMON_ADDR		0x29
14 #define GSC_EEPROM_ADDR		0x51
15 
16 /* System Controller registers */
17 enum {
18 	GSC_SC_CTRL0		= 0x00,
19 	GSC_SC_CTRL1		= 0x01,
20 	GSC_SC_STATUS		= 0x0a,
21 	GSC_SC_FWCRC		= 0x0c,
22 	GSC_SC_FWVER		= 0x0e,
23 };
24 
25 /* System Controller Control1 bits */
26 enum {
27 	GSC_SC_CTRL1_WDTIME	= 4, /* 1 = 60s timeout, 0 = 30s timeout */
28 	GSC_SC_CTRL1_WDEN	= 5, /* 1 = enable, 0 = disable */
29 	GSC_SC_CTRL1_WDDIS	= 7, /* 1 = disable boot watchdog */
30 };
31 
32 /* System Controller Interrupt bits */
33 enum {
34 	GSC_SC_IRQ_PB		= 0, /* Pushbutton switch */
35 	GSC_SC_IRQ_SECURE	= 1, /* Secure Key erase operation complete */
36 	GSC_SC_IRQ_EEPROM_WP	= 2, /* EEPROM write violation */
37 	GSC_SC_IRQ_GPIO		= 4, /* GPIO change */
38 	GSC_SC_IRQ_TAMPER	= 5, /* Tamper detect */
39 	GSC_SC_IRQ_WATCHDOG	= 6, /* Watchdog trip */
40 	GSC_SC_IRQ_PBLONG	= 7, /* Pushbutton long hold */
41 };
42 
43 /* Hardware Monitor registers */
44 enum {
45 	GSC_HWMON_TEMP		= 0x00,
46 	GSC_HWMON_VIN		= 0x02,
47 	GSC_HWMON_VDD_3P3	= 0x05,
48 	GSC_HWMON_VBATT		= 0x08,
49 	GSC_HWMON_VDD_5P0	= 0x0b,
50 	GSC_HWMON_VDD_CORE	= 0x0e,
51 	GSC_HWMON_VDD_HIGH	= 0x14,
52 	GSC_HWMON_VDD_DDR	= 0x17,
53 	GSC_HWMON_VDD_SOC	= 0x11,
54 	GSC_HWMON_VDD_1P8	= 0x1d,
55 	GSC_HWMON_VDD_IO2	= 0x20,
56 	GSC_HWMON_VDD_2P5	= 0x23,
57 	GSC_HWMON_VDD_IO3	= 0x26,
58 	GSC_HWMON_VDD_IO4	= 0x29,
59 };
60 
61 /*
62  * I2C transactions to the GSC are done via these functions which
63  * perform retries in the case of a busy GSC NAK'ing the transaction
64  */
65 int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len);
66 int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len);
67 int gsc_info(int verbose);
68 int gsc_boot_wd_disable(void);
69 #endif
70 
71