2 * Library to support early TI EVM EEPROM handling
4 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
8 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/omap_common.h>
15 #include "board_detect.h"
18 * ti_i2c_eeprom_init - Initialize an i2c bus and probe for a device
19 * @i2c_bus: i2c bus number to initialize
20 * @dev_addr: Device address to probe for
22 * Return: 0 on success or corresponding error on failure.
24 static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
29 rc = i2c_set_bus_num(i2c_bus);
34 return i2c_probe(dev_addr);
38 * ti_i2c_eeprom_read - Read data from an EEPROM
39 * @dev_addr: The device address of the EEPROM
40 * @offset: Offset to start reading in the EEPROM
41 * @ep: Pointer to a buffer to read into
42 * @epsize: Size of buffer
44 * Return: 0 on success or corresponding result of i2c_read
46 static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
47 uchar *ep, int epsize)
49 return i2c_read(dev_addr, offset, 2, ep, epsize);
53 * ti_eeprom_string_cleanup() - Handle eeprom programming errors
54 * @s: eeprom string (should be NULL terminated)
56 * Some Board manufacturers do not add a NULL termination at the
57 * end of string, instead some binary information is kludged in, hence
58 * convert the string to just printable characters of ASCII chart.
60 static void __maybe_unused ti_eeprom_string_cleanup(char *s)
65 for (i = 0; i < l; i++, s++)
66 if (*s < ' ' || *s > '~') {
72 __weak void gpi2c_init(void)
76 static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
77 u32 header, u32 size, uint8_t *ep)
83 rc = ti_i2c_eeprom_init(bus_addr, dev_addr);
88 * Read the header first then only read the other contents.
91 rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
95 /* Corrupted data??? */
96 if (hdr_read != header) {
97 rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
99 * read the eeprom header using i2c again, but use only a
100 * 1 byte address (some legacy boards need this..)
104 rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
109 if (hdr_read != header)
112 rc = i2c_read(dev_addr, 0x0, byte, ep, size);
119 int __maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr)
122 struct ti_am_eeprom am_ep;
123 struct ti_common_eeprom *ep;
126 if (ep->header == TI_EEPROM_HEADER_MAGIC)
129 /* Initialize with a known bad marker for i2c fails.. */
130 ep->header = TI_DEAD_EEPROM_MAGIC;
132 ep->version[0] = 0x0;
135 rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
136 sizeof(am_ep), (uint8_t *)&am_ep);
140 ep->header = am_ep.header;
141 strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
142 ti_eeprom_string_cleanup(ep->name);
144 /* BeagleBone Green '1' eeprom, board_rev: 0x1a 0x00 0x00 0x00 */
145 if (am_ep.version[0] == 0x1a && am_ep.version[1] == 0x00 &&
146 am_ep.version[2] == 0x00 && am_ep.version[3] == 0x00)
147 strlcpy(ep->version, "BBG1", TI_EEPROM_HDR_REV_LEN + 1);
149 strlcpy(ep->version, am_ep.version, TI_EEPROM_HDR_REV_LEN + 1);
150 ti_eeprom_string_cleanup(ep->version);
151 strlcpy(ep->serial, am_ep.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
152 ti_eeprom_string_cleanup(ep->serial);
153 strlcpy(ep->config, am_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
154 ti_eeprom_string_cleanup(ep->config);
156 memcpy(ep->mac_addr, am_ep.mac_addr,
157 TI_EEPROM_HDR_NO_OF_MAC_ADDR * TI_EEPROM_HDR_ETH_ALEN);
163 bool __maybe_unused board_ti_is(char *name_tag)
165 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
167 if (ep->header == TI_DEAD_EEPROM_MAGIC)
169 return !strncmp(ep->name, name_tag, TI_EEPROM_HDR_NAME_LEN);
172 bool __maybe_unused board_ti_rev_is(char *rev_tag, int cmp_len)
174 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
177 if (ep->header == TI_DEAD_EEPROM_MAGIC)
180 l = cmp_len > TI_EEPROM_HDR_REV_LEN ? TI_EEPROM_HDR_REV_LEN : cmp_len;
181 return !strncmp(ep->version, rev_tag, l);
184 char * __maybe_unused board_ti_get_rev(void)
186 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
188 if (ep->header == TI_DEAD_EEPROM_MAGIC)
194 char * __maybe_unused board_ti_get_config(void)
196 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
198 if (ep->header == TI_DEAD_EEPROM_MAGIC)
204 char * __maybe_unused board_ti_get_name(void)
206 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
208 if (ep->header == TI_DEAD_EEPROM_MAGIC)
215 board_ti_get_eth_mac_addr(int index,
216 u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
218 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
220 if (ep->header == TI_DEAD_EEPROM_MAGIC)
223 if (index < 0 || index >= TI_EEPROM_HDR_NO_OF_MAC_ADDR)
226 memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
230 memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
233 void __maybe_unused set_board_info_env(char *name)
235 char *unknown = "unknown";
236 struct ti_common_eeprom *ep = TI_EEPROM_DATA;
239 setenv("board_name", name);
241 setenv("board_name", ep->name);
243 setenv("board_name", unknown);
246 setenv("board_rev", ep->version);
248 setenv("board_rev", unknown);
251 setenv("board_serial", ep->serial);
253 setenv("board_serial", unknown);