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toradex: tdx-cfg-block: add EEPROM read/store wrappers

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These functions wrap functionality for storing config blocks in EEPROM.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
This commit is contained in:
Igor Opaniuk 2020-07-15 13:30:53 +03:00 committed by Stefano Babic
parent fb99ac9caf
commit c2e969378d
3 changed files with 105 additions and 0 deletions
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1
board/toradex/common/Makefile
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@ -8,4 +8,5 @@ obj- := __dummy__.o
else
obj-$(CONFIG_TDX_CFG_BLOCK) += tdx-cfg-block.o
obj-y += tdx-common.o
obj-y += tdx-eeprom.o
endif

90
board/toradex/common/tdx-eeprom.c Normal file
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@ -0,0 +1,90 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2020 Toradex
*/
#include <dm.h>
#include <i2c_eeprom.h>
#include <linux/errno.h>
DECLARE_GLOBAL_DATA_PTR;
static int get_tdx_eeprom(u32 eeprom_id, struct udevice **devp)
{
int ret = 0;
int node;
ofnode eeprom;
char eeprom_str[16];
const char *path;
if (!gd->fdt_blob) {
printf("%s: don't have a valid gd->fdt_blob!\n", __func__);
return -EFAULT;
}
node = fdt_path_offset(gd->fdt_blob, "/aliases");
if (node < 0)
return -ENODEV;
sprintf(eeprom_str, "eeprom%d", eeprom_id);
path = fdt_getprop(gd->fdt_blob, node, eeprom_str, NULL);
if (!path) {
printf("%s: no alias for %s\n", __func__, eeprom_str);
return -ENODEV;
}
eeprom = ofnode_path(path);
if (!ofnode_valid(eeprom)) {
printf("%s: invalid hardware path to EEPROM\n", __func__);
return -ENODEV;
}
ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, eeprom, devp);
if (ret) {
printf("%s: cannot find EEPROM by node\n", __func__);
return ret;
}
return ret;
}
int read_tdx_eeprom_data(u32 eeprom_id, int offset, u8 *buf,
int size)
{
struct udevice *dev;
int ret;
ret = get_tdx_eeprom(eeprom_id, &dev);
if (ret)
return ret;
ret = i2c_eeprom_read(dev, 0x0, buf, size);
if (ret) {
printf("%s: error reading data from EEPROM id: %d!, ret = %d\n",
__func__, eeprom_id, ret);
return ret;
}
return ret;
}
int write_tdx_eeprom_data(u32 eeprom_id, int offset, u8 *buf,
int size)
{
struct udevice *dev;
int ret;
ret = get_tdx_eeprom(eeprom_id, &dev);
if (ret)
return ret;
ret = i2c_eeprom_write(dev, 0x0, buf, size);
if (ret) {
printf("%s: error writing data to EEPROM id: %d, ret = %d\n",
__func__, eeprom_id, ret);
return ret;
}
return ret;
}

14
board/toradex/common/tdx-eeprom.h Normal file
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@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2020 Toradex
*/
#ifndef _TDX_EEPROM_H
#define _TDX_EEPROM_H
#include <i2c_eeprom.h>
int read_tdx_eeprom_data(u32 eeprom_id, int offset, uint8_t *buf, int size);
int write_tdx_eeprom_data(u32 eeprom_id, int offset, uint8_t *buf, int size);
#endif /* _TDX_EEPROM_H */