1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com> 4 * 5 * Original author: 6 * Ben Collins <bcollins@ubuntu.com> 7 * 8 * Additional work by: 9 * John Brooks <john.brooks@bluecherry.net> 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/delay.h> 14 15 #include "solo6x10.h" 16 17 /* Control */ 18 #define EE_SHIFT_CLK 0x04 19 #define EE_CS 0x08 20 #define EE_DATA_WRITE 0x02 21 #define EE_DATA_READ 0x01 22 #define EE_ENB (0x80 | EE_CS) 23 24 #define eeprom_delay() udelay(100) 25 #if 0 26 #define eeprom_delay() solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) 27 #define eeprom_delay() ({ \ 28 int i, ret; \ 29 udelay(100); \ 30 for (i = ret = 0; i < 1000 && !ret; i++) \ 31 ret = solo_eeprom_reg_read(solo_dev); \ 32 }) 33 #endif 34 #define ADDR_LEN 6 35 36 /* Commands */ 37 #define EE_EWEN_CMD 4 38 #define EE_EWDS_CMD 4 39 #define EE_WRITE_CMD 5 40 #define EE_READ_CMD 6 41 #define EE_ERASE_CMD 7 42 43 static unsigned int solo_eeprom_reg_read(struct solo_dev *solo_dev) 44 { 45 return solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) & EE_DATA_READ; 46 } 47 48 static void solo_eeprom_reg_write(struct solo_dev *solo_dev, u32 data) 49 { 50 solo_reg_write(solo_dev, SOLO_EEPROM_CTRL, data); 51 eeprom_delay(); 52 } 53 54 static void solo_eeprom_cmd(struct solo_dev *solo_dev, int cmd) 55 { 56 int i; 57 58 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ACCESS_EN); 59 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); 60 61 for (i = 4 + ADDR_LEN; i >= 0; i--) { 62 int dataval = (cmd & (1 << i)) ? EE_DATA_WRITE : 0; 63 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); 67 } 68 69 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); 70 } 71 72 unsigned int solo_eeprom_ewen(struct solo_dev *solo_dev, int w_en) 73 { 74 int ewen_cmd = (w_en ? 0x3f : 0) | (EE_EWEN_CMD << ADDR_LEN); 75 unsigned int retval = 0; 76 int i; 77 78 solo_eeprom_cmd(solo_dev, ewen_cmd); 79 80 for (i = 0; i < 16; i++) { 81 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | 82 EE_SHIFT_CLK); 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); 86 } 87 88 solo_eeprom_reg_write(solo_dev, ~EE_CS); 89 retval = (retval << 1) | solo_eeprom_reg_read(solo_dev); 90 91 return retval; 92 } 93 94 __be16 solo_eeprom_read(struct solo_dev *solo_dev, int loc) 95 { 96 int read_cmd = loc | (EE_READ_CMD << ADDR_LEN); 97 u16 retval = 0; 98 int i; 99 100 solo_eeprom_cmd(solo_dev, read_cmd); 101 102 for (i = 0; i < 16; i++) { 103 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | 104 EE_SHIFT_CLK); 105 retval = (retval << 1) | solo_eeprom_reg_read(solo_dev); 106 solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); 107 } 108 109 solo_eeprom_reg_write(solo_dev, ~EE_CS); 110 111 return (__force __be16)retval; 112 } 113 114 int solo_eeprom_write(struct solo_dev *solo_dev, int loc, 115 __be16 data) 116 { 117 int write_cmd = loc | (EE_WRITE_CMD << ADDR_LEN); 118 unsigned int retval; 119 int i; 120 121 solo_eeprom_cmd(solo_dev, write_cmd); 122 123 for (i = 15; i >= 0; i--) { 124 unsigned int dataval = ((__force unsigned)data >> i) & 1; 125 126 solo_eeprom_reg_write(solo_dev, EE_ENB); 127 solo_eeprom_reg_write(solo_dev, 128 EE_ENB | (dataval << 1) | EE_SHIFT_CLK); 129 } 130 131 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); 134 135 for (i = retval = 0; i < 10000 && !retval; i++) 136 retval = solo_eeprom_reg_read(solo_dev); 137 138 solo_eeprom_reg_write(solo_dev, ~EE_CS); 139 140 return !retval; 141 } 142