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Bartlomiej Sieka4707fb52006-10-13 21:09:09 +02001/*
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +02002 * (C) Copyright 2006
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +02006 */
7
8#include <common.h>
9#include <mpc5xxx.h>
10
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010011/* For the V38B board the pin is GPIO_PSC_6 */
12#define GPIO_PIN GPIO_PSC6_0
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020013
14#define NO_ERROR 0
15#define ERR_NO_NUMBER 1
16#define ERR_BAD_NUMBER 2
17
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020018static int is_high(void);
19static int check_device(void);
20static void io_out(int value);
21static void io_input(void);
22static void io_output(void);
23static void init_gpio(void);
24static void read_byte(unsigned char *data);
25static void write_byte(unsigned char command);
26
27void read_2501_memory(unsigned char *psernum, unsigned char *perr);
28void board_get_enetaddr(uchar *enetaddr);
29
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010030
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020031static int is_high()
32{
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010033 return (*((vu_long *) MPC5XXX_WU_GPIO_DATA_I) & GPIO_PIN);
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020034}
35
36static void io_out(int value)
37{
38 if (value)
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010039 *((vu_long *) MPC5XXX_WU_GPIO_DATA_O) |= GPIO_PIN;
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020040 else
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010041 *((vu_long *) MPC5XXX_WU_GPIO_DATA_O) &= ~GPIO_PIN;
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020042}
43
44static void io_input()
45{
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010046 *((vu_long *) MPC5XXX_WU_GPIO_DIR) &= ~GPIO_PIN;
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020047 udelay(3); /* allow input to settle */
48}
49
50static void io_output()
51{
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010052 *((vu_long *) MPC5XXX_WU_GPIO_DIR) |= GPIO_PIN;
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020053}
54
55static void init_gpio()
56{
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010057 *((vu_long *) MPC5XXX_WU_GPIO_ENABLE) |= GPIO_PIN; /* Enable appropriate pin */
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020058}
59
60void read_2501_memory(unsigned char *psernum, unsigned char *perr)
61{
62#define NBYTES 28
63 unsigned char crcval, i;
64 unsigned char buf[NBYTES];
65
66 *perr = 0;
67 crcval = 0;
68
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010069 for (i = 0; i < NBYTES; i++)
70 buf[i] = 0;
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020071
72 if (!check_device())
73 *perr = ERR_NO_NUMBER;
74 else {
75 *perr = NO_ERROR;
76 write_byte(0xCC); /* skip ROM (0xCC) */
77 write_byte(0xF0); /* Read memory command 0xF0 */
78 write_byte(0x00); /* Address TA1=0, TA2=0 */
79 write_byte(0x00);
80 read_byte(&crcval); /* Read CRC of address and command */
81
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010082 for (i = 0; i < NBYTES; i++)
83 read_byte(&buf[i]);
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020084 }
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010085 if (strncmp((const char *) &buf[11], "MAREL IEEE 802.3", 16)) {
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020086 *perr = ERR_BAD_NUMBER;
87 psernum[0] = 0x00;
88 psernum[1] = 0xE0;
89 psernum[2] = 0xEE;
90 psernum[3] = 0xFF;
91 psernum[4] = 0xFF;
92 psernum[5] = 0xFF;
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +010093 } else {
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +020094 psernum[0] = 0x00;
95 psernum[1] = 0xE0;
96 psernum[2] = 0xEE;
97 psernum[3] = buf[7];
98 psernum[4] = buf[6];
99 psernum[5] = buf[5];
100 }
101}
102
103static int check_device()
104{
105 int found;
106
107 io_output();
108 io_out(0);
109 udelay(500); /* must be at least 480 us low pulse */
110
111 io_input();
112 udelay(60);
113
114 found = (is_high() == 0) ? 1 : 0;
115 udelay(500); /* must be at least 480 us low pulse */
116
117 return found;
118}
119
120static void write_byte(unsigned char command)
121{
122 char i;
123
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100124 for (i = 0; i < 8; i++) {
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200125 /* 1 us to 15 us low pulse starts bit slot */
126 /* Start with high pulse for 3 us */
127 io_input();
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200128 udelay(3);
129
130 io_out(0);
131 io_output();
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200132 udelay(3);
133
134 if (command & 0x01) {
135 /* 60 us high for 1-bit */
136 io_input();
137 udelay(60);
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100138 } else
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200139 /* 60 us low for 0-bit */
140 udelay(60);
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200141 /* Leave pin as input */
142 io_input();
143
144 command = command >> 1;
145 }
146}
147
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100148static void read_byte(unsigned char *data)
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200149{
150 unsigned char i, rdat = 0;
151
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100152 for (i = 0; i < 8; i++) {
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200153 /* read one bit from one-wire device */
154
155 /* 1 - 15 us low starts bit slot */
156 io_out(0);
157 io_output();
158 udelay(0);
159
160 /* allow line to be pulled high */
161 io_input();
162
163 /* delay 10 us */
164 udelay(10);
165
166 /* now sample input status */
167 if (is_high())
168 rdat = (rdat >> 1) | 0x80;
169 else
170 rdat = rdat >> 1;
Wolfgang Denkfcfed4f2006-10-18 22:44:38 +0200171
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200172 udelay(60); /* at least 60 us */
173 }
174 /* copy the return value */
175 *data = rdat;
176}
177
178void board_get_enetaddr(uchar *enetaddr)
179{
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100180 unsigned char sn[6], err = NO_ERROR;
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200181
182 init_gpio();
183
184 read_2501_memory(sn, &err);
185
186 if (err == NO_ERROR) {
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100187 sprintf((char *)enetaddr, "%02x:%02x:%02x:%02x:%02x:%02x",
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200188 sn[0], sn[1], sn[2], sn[3], sn[4], sn[5]);
189 printf("MAC address: %s\n", enetaddr);
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100190 setenv("ethaddr", (char *)enetaddr);
191 } else {
192 sprintf((char *)enetaddr, "00:01:02:03:04:05");
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200193 printf("Error reading MAC address.\n");
194 printf("Setting default to %s\n", enetaddr);
Bartlomiej Siekaffa150b2006-11-01 01:45:46 +0100195 setenv("ethaddr", (char *)enetaddr);
Bartlomiej Sieka4707fb52006-10-13 21:09:09 +0200196 }
197}