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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2023 Variscite Ltd.
*
*/
#include <command.h>
#include <dm.h>
#include <i2c.h>
#include <asm/io.h>
#include <cpu_func.h>
#include <u-boot/crc.h>
#include <asm/arch-imx9/ddr.h>
#include "imx9_eeprom.h"
static int var_eeprom_get_dev(struct udevice **devp)
{
int ret;
struct udevice *bus;
ret = uclass_get_device_by_name(UCLASS_I2C, VAR_SOM_EEPROM_I2C_NAME, &bus);
if (ret) {
printf("%s: No EEPROM I2C bus '%s'\n", __func__,
VAR_SOM_EEPROM_I2C_NAME);
return ret;
}
ret = dm_i2c_probe(bus, VAR_SOM_EEPROM_I2C_ADDR, 0, devp);
if (ret) {
printf("%s: I2C EEPROM probe failed\n", __func__);
return ret;
}
i2c_set_chip_offset_len(*devp, 1);
i2c_set_chip_addr_offset_mask(*devp, 1);
return 0;
}
int var_eeprom_read_header(struct var_eeprom *e)
{
int ret;
struct udevice *dev;
ret = var_eeprom_get_dev(&dev);
if (ret) {
printf("%s: Failed to detect I2C EEPROM\n", __func__);
return ret;
}
/* Read EEPROM header to memory */
ret = dm_i2c_read(dev, 0, (void *)e, sizeof(*e));
if (ret) {
printf("%s: EEPROM read failed, ret=%d\n", __func__, ret);
return ret;
}
return 0;
}
int var_eeprom_get_mac(struct var_eeprom *ep, u8 *mac)
{
flush_dcache_all();
if (!var_eeprom_is_valid(ep))
return -1;
memcpy(mac, ep->mac, sizeof(ep->mac));
return 0;
}
int var_eeprom_get_dram_size(struct var_eeprom *ep, phys_size_t *size)
{
/* No data in EEPROM - return default DRAM size */
if (!var_eeprom_is_valid(ep)) {
*size = DEFAULT_SDRAM_SIZE;
return 0;
}
*size = (ep->dramsize * 128UL) << 20;
return 0;
}
void var_eeprom_print_prod_info(struct var_eeprom *ep)
{
if (IS_ENABLED(CONFIG_XPL_BUILD))
return;
flush_dcache_all();
if (!var_eeprom_is_valid(ep))
return;
if (IS_ENABLED(CONFIG_TARGET_IMX93_VAR_SOM))
printf("\nPart number: VSM-MX93-%.*s\n",
(int)sizeof(ep->partnum), ep->partnum);
printf("Assembly: AS%.*s\n", (int)sizeof(ep->assembly), (char *)ep->assembly);
printf("Production date: %.*s %.*s %.*s\n",
4, /* YYYY */
(char *)ep->date,
3, /* MMM */
((char *)ep->date) + 4,
2, /* DD */
((char *)ep->date) + 4 + 3);
printf("Serial Number: %02x:%02x:%02x:%02x:%02x:%02x\n",
ep->mac[0], ep->mac[1], ep->mac[2], ep->mac[3], ep->mac[4], ep->mac[5]);
debug("EEPROM version: 0x%x\n", ep->version);
debug("SOM features: 0x%x\n", ep->features);
printf("SOM revision: 0x%x\n", ep->somrev);
printf("DRAM PN: VIC-%04d\n", ep->ddr_vic);
debug("DRAM size: %d GiB\n\n", (ep->dramsize * 128) / 1024);
}
int var_carrier_eeprom_read(const char *bus_name, int addr, struct var_carrier_eeprom *ep)
{
int ret;
struct udevice *bus;
struct udevice *dev;
ret = uclass_get_device_by_name(UCLASS_I2C, bus_name, &bus);
if (ret) {
printf("%s: No bus '%s'\n", __func__, bus_name);
return ret;
}
ret = dm_i2c_probe(bus, addr, 0, &dev);
if (ret) {
printf("%s: Carrier EEPROM I2C probe failed\n", __func__);
return ret;
}
/* Read EEPROM to memory */
ret = dm_i2c_read(dev, 0, (void *)ep, sizeof(*ep));
if (ret) {
printf("%s: Carrier EEPROM read failed, ret=%d\n", __func__, ret);
return ret;
}
return 0;
}
int var_carrier_eeprom_is_valid(struct var_carrier_eeprom *ep)
{
u32 crc, crc_offset = offsetof(struct var_carrier_eeprom, crc);
if (htons(ep->magic) != VAR_CARRIER_EEPROM_MAGIC) {
printf("Invalid carrier EEPROM magic 0x%x, expected 0x%x\n",
htons(ep->magic), VAR_CARRIER_EEPROM_MAGIC);
return 0;
}
if (ep->struct_ver < 1) {
printf("Invalid carrier EEPROM version 0x%x\n", ep->struct_ver);
return 0;
}
if (ep->struct_ver == 1)
return 1;
/* Only EEPROM structure above version 1 has CRC field */
crc = crc32(0, (void *)ep, crc_offset);
if (crc != ep->crc) {
printf("Carrier EEPROM CRC mismatch (%08x != %08x)\n",
crc, be32_to_cpu(ep->crc));
return 0;
}
return 1;
}
/*
* Returns carrier board revision string via 'rev' argument. For legacy
* carrier board revisions the "legacy" string is returned. For new carrier
* board revisions the actual carrier revision is returned. Symphony-Board
* 1.4 and below are legacy, 1.4a and above are new. DT8MCustomBoard 1.4 and
* below are legacy, 2.0 and above are new.
*
*/
void var_carrier_eeprom_get_revision(struct var_carrier_eeprom *ep, char *rev, size_t size)
{
if (var_carrier_eeprom_is_valid(ep))
strlcpy(rev, (const char *)ep->carrier_rev, size);
else
strlcpy(rev, "legacy", size);
}
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