1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com>
6 * Ben Collins <bcollins@ubuntu.com>
9 * John Brooks <john.brooks@bluecherry.net>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
18 #define EE_SHIFT_CLK 0x04
20 #define EE_DATA_WRITE 0x02
21 #define EE_DATA_READ 0x01
22 #define EE_ENB (0x80 | EE_CS)
24 #define eeprom_delay() udelay(100)
26 #define eeprom_delay() solo_reg_read(solo_dev, SOLO_EEPROM_CTRL)
27 #define eeprom_delay() ({ \
30 for (i = ret = 0; i < 1000 && !ret; i++) \
31 ret = solo_eeprom_reg_read(solo_dev); \
39 #define EE_WRITE_CMD 5
41 #define EE_ERASE_CMD 7
43 static unsigned int solo_eeprom_reg_read(struct solo_dev *solo_dev)
45 return solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) & EE_DATA_READ;
48 static void solo_eeprom_reg_write(struct solo_dev *solo_dev, u32 data)
50 solo_reg_write(solo_dev, SOLO_EEPROM_CTRL, data);
54 static void solo_eeprom_cmd(struct solo_dev *solo_dev, int cmd)
58 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ACCESS_EN);
59 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
61 for (i = 4 + ADDR_LEN; i >= 0; i--) {
62 int dataval = (cmd & (1 << i)) ? EE_DATA_WRITE : 0;
64 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | dataval);
65 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
66 EE_SHIFT_CLK | dataval);
69 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
72 unsigned int solo_eeprom_ewen(struct solo_dev *solo_dev, int w_en)
74 int ewen_cmd = (w_en ? 0x3f : 0) | (EE_EWEN_CMD << ADDR_LEN);
75 unsigned int retval = 0;
78 solo_eeprom_cmd(solo_dev, ewen_cmd);
80 for (i = 0; i < 16; i++) {
81 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
83 retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
84 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
85 retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
88 solo_eeprom_reg_write(solo_dev, ~EE_CS);
89 retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
94 __be16 solo_eeprom_read(struct solo_dev *solo_dev, int loc)
96 int read_cmd = loc | (EE_READ_CMD << ADDR_LEN);
100 solo_eeprom_cmd(solo_dev, read_cmd);
102 for (i = 0; i < 16; i++) {
103 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
105 retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
106 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
109 solo_eeprom_reg_write(solo_dev, ~EE_CS);
111 return (__force __be16)retval;
114 int solo_eeprom_write(struct solo_dev *solo_dev, int loc,
117 int write_cmd = loc | (EE_WRITE_CMD << ADDR_LEN);
121 solo_eeprom_cmd(solo_dev, write_cmd);
123 for (i = 15; i >= 0; i--) {
124 unsigned int dataval = ((__force unsigned)data >> i) & 1;
126 solo_eeprom_reg_write(solo_dev, EE_ENB);
127 solo_eeprom_reg_write(solo_dev,
128 EE_ENB | (dataval << 1) | EE_SHIFT_CLK);
131 solo_eeprom_reg_write(solo_dev, EE_ENB);
132 solo_eeprom_reg_write(solo_dev, ~EE_CS);
133 solo_eeprom_reg_write(solo_dev, EE_ENB);
135 for (i = retval = 0; i < 10000 && !retval; i++)
136 retval = solo_eeprom_reg_read(solo_dev);
138 solo_eeprom_reg_write(solo_dev, ~EE_CS);