u-boot/board/ti/common/board_detect.c
Lokesh Vutla d3b98a9eb9 ti: common: dra7: Add standard access for board description EEPROM
DRA7 EVM revH and later EVMs have EEPROM populated that can contain board
description information such as name, revision, DDR definition, etc. Adding
support for this EEPROM format.

Acked-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
2016-03-14 19:18:49 -04:00

318 lines
7.2 KiB
C

/*
* Library to support early TI EVM EEPROM handling
*
* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
* Lokesh Vutla
* Steve Kipisz
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/omap_common.h>
#include <i2c.h>
#include "board_detect.h"
/**
* ti_i2c_eeprom_init - Initialize an i2c bus and probe for a device
* @i2c_bus: i2c bus number to initialize
* @dev_addr: Device address to probe for
*
* Return: 0 on success or corresponding error on failure.
*/
static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
{
int rc;
if (i2c_bus >= 0) {
rc = i2c_set_bus_num(i2c_bus);
if (rc)
return rc;
}
return i2c_probe(dev_addr);
}
/**
* ti_i2c_eeprom_read - Read data from an EEPROM
* @dev_addr: The device address of the EEPROM
* @offset: Offset to start reading in the EEPROM
* @ep: Pointer to a buffer to read into
* @epsize: Size of buffer
*
* Return: 0 on success or corresponding result of i2c_read
*/
static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
uchar *ep, int epsize)
{
return i2c_read(dev_addr, offset, 2, ep, epsize);
}
/**
* ti_eeprom_string_cleanup() - Handle eeprom programming errors
* @s: eeprom string (should be NULL terminated)
*
* Some Board manufacturers do not add a NULL termination at the
* end of string, instead some binary information is kludged in, hence
* convert the string to just printable characters of ASCII chart.
*/
static void __maybe_unused ti_eeprom_string_cleanup(char *s)
{
int i, l;
l = strlen(s);
for (i = 0; i < l; i++, s++)
if (*s < ' ' || *s > '~') {
*s = 0;
break;
}
}
__weak void gpi2c_init(void)
{
}
static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
u32 header, u32 size, uint8_t *ep)
{
u32 byte, hdr_read;
int rc;
gpi2c_init();
rc = ti_i2c_eeprom_init(bus_addr, dev_addr);
if (rc)
return rc;
/*
* Read the header first then only read the other contents.
*/
byte = 2;
rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
if (rc)
return rc;
/* Corrupted data??? */
if (hdr_read != header) {
rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
/*
* read the eeprom header using i2c again, but use only a
* 1 byte address (some legacy boards need this..)
*/
byte = 1;
if (rc)
rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
4);
if (rc)
return rc;
}
if (hdr_read != header)
return -1;
rc = i2c_read(dev_addr, 0x0, byte, ep, size);
if (rc)
return rc;
return 0;
}
int __maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr)
{
int rc;
struct ti_am_eeprom am_ep;
struct ti_common_eeprom *ep;
ep = TI_EEPROM_DATA;
if (ep->header == TI_EEPROM_HEADER_MAGIC)
goto already_read;
/* Initialize with a known bad marker for i2c fails.. */
ep->header = TI_DEAD_EEPROM_MAGIC;
ep->name[0] = 0x0;
ep->version[0] = 0x0;
ep->serial[0] = 0x0;
rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
sizeof(am_ep), (uint8_t *)&am_ep);
if (rc)
return rc;
ep->header = am_ep.header;
strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
ti_eeprom_string_cleanup(ep->name);
/* BeagleBone Green '1' eeprom, board_rev: 0x1a 0x00 0x00 0x00 */
if (am_ep.version[0] == 0x1a && am_ep.version[1] == 0x00 &&
am_ep.version[2] == 0x00 && am_ep.version[3] == 0x00)
strlcpy(ep->version, "BBG1", TI_EEPROM_HDR_REV_LEN + 1);
else
strlcpy(ep->version, am_ep.version, TI_EEPROM_HDR_REV_LEN + 1);
ti_eeprom_string_cleanup(ep->version);
strlcpy(ep->serial, am_ep.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
ti_eeprom_string_cleanup(ep->serial);
strlcpy(ep->config, am_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
ti_eeprom_string_cleanup(ep->config);
memcpy(ep->mac_addr, am_ep.mac_addr,
TI_EEPROM_HDR_NO_OF_MAC_ADDR * TI_EEPROM_HDR_ETH_ALEN);
already_read:
return 0;
}
int __maybe_unused ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr)
{
int rc, offset = 0;
struct dra7_eeprom dra7_ep;
struct ti_common_eeprom *ep;
ep = TI_EEPROM_DATA;
if (ep->header == DRA7_EEPROM_HEADER_MAGIC)
goto already_read;
/* Initialize with a known bad marker for i2c fails.. */
ep->header = 0xADEAD12C;
ep->name[0] = 0x0;
ep->version[0] = 0x0;
ep->serial[0] = 0x0;
ep->emif1_size = 0;
ep->emif2_size = 0;
rc = ti_i2c_eeprom_get(bus_addr, dev_addr, DRA7_EEPROM_HEADER_MAGIC,
sizeof(dra7_ep), (uint8_t *)&dra7_ep);
if (rc)
return rc;
ep->header = dra7_ep.header;
strlcpy(ep->name, dra7_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
ti_eeprom_string_cleanup(ep->name);
offset = dra7_ep.version_major - 1;
/* Rev F is skipped */
if (offset >= 5)
offset = offset + 1;
snprintf(ep->version, TI_EEPROM_HDR_REV_LEN + 1, "%c.%d",
'A' + offset, dra7_ep.version_minor);
ti_eeprom_string_cleanup(ep->version);
ep->emif1_size = (u64)dra7_ep.emif1_size;
ep->emif2_size = (u64)dra7_ep.emif2_size;
strlcpy(ep->config, dra7_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
ti_eeprom_string_cleanup(ep->config);
already_read:
return 0;
}
bool __maybe_unused board_ti_is(char *name_tag)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return false;
return !strncmp(ep->name, name_tag, TI_EEPROM_HDR_NAME_LEN);
}
bool __maybe_unused board_ti_rev_is(char *rev_tag, int cmp_len)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
int l;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return false;
l = cmp_len > TI_EEPROM_HDR_REV_LEN ? TI_EEPROM_HDR_REV_LEN : cmp_len;
return !strncmp(ep->version, rev_tag, l);
}
char * __maybe_unused board_ti_get_rev(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return NULL;
return ep->version;
}
char * __maybe_unused board_ti_get_config(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return NULL;
return ep->config;
}
char * __maybe_unused board_ti_get_name(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
return NULL;
return ep->name;
}
void __maybe_unused
board_ti_get_eth_mac_addr(int index,
u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header == TI_DEAD_EEPROM_MAGIC)
goto fail;
if (index < 0 || index >= TI_EEPROM_HDR_NO_OF_MAC_ADDR)
goto fail;
memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
return;
fail:
memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
}
u64 __maybe_unused board_ti_get_emif1_size(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
return 0;
return ep->emif1_size;
}
u64 __maybe_unused board_ti_get_emif2_size(void)
{
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
return 0;
return ep->emif2_size;
}
void __maybe_unused set_board_info_env(char *name)
{
char *unknown = "unknown";
struct ti_common_eeprom *ep = TI_EEPROM_DATA;
if (name)
setenv("board_name", name);
else if (ep->name)
setenv("board_name", ep->name);
else
setenv("board_name", unknown);
if (ep->version)
setenv("board_rev", ep->version);
else
setenv("board_rev", unknown);
if (ep->serial)
setenv("board_serial", ep->serial);
else
setenv("board_serial", unknown);
}