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drivers: k3_fuse: Add fuse sub-system func calls

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Add K3_FUSE config option to add and enable fuse sub-system
implementation function calls.

Signed-off-by: Harsha Vardhan V M <h-vm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Harsha Vardhan V M 2025-03-19 14:17:13 +05:30 • committed by Tom Rini
parent 578e7882bf
commit ed5f2e5bed
3 changed files with 86 additions and 0 deletions
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7
drivers/misc/Kconfig
View file

@ -468,6 +468,13 @@ config STM32MP_FUSE
for STM32MP architecture.
This API is needed for CMD_FUSE.
config K3_FUSE
bool "Enable TI K3 fuse wrapper providing the fuse API"
depends on MISC && CMD_FUSE && CMD_FUSE_WRITEBUFF
help
If you say Y here, you will get support for the fuse API (OTP)
for TI K3 architecture.
config STM32_RCC
bool "Enable RCC driver for the STM32 SoC's family"
depends on (ARCH_STM32 || ARCH_STM32MP) && MISC

1
drivers/misc/Makefile
View file

@ -48,6 +48,7 @@ obj-$(CONFIG_$(XPL_)I2C_EEPROM) += i2c_eeprom.o
obj-$(CONFIG_IHS_FPGA) += ihs_fpga.o
obj-$(CONFIG_IMX8) += imx8/
obj-$(CONFIG_IMX_ELE) += imx_ele/
obj-$(CONFIG_K3_FUSE) += k3_fuse.o
obj-$(CONFIG_LED_STATUS) += status_led.o
obj-$(CONFIG_LED_STATUS_GPIO) += gpio_led.o
obj-$(CONFIG_MPC83XX_SERDES) += mpc83xx_serdes.o

78
drivers/misc/k3_fuse.c Normal file
View file

@ -0,0 +1,78 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2025 Texas Instruments Incorporated, <www.ti.com>
*/
#include <errno.h>
#include <stdio.h>
#include <fuse.h>
#include <linux/arm-smccc.h>
#include <string.h>
#define K3_SIP_OTP_WRITEBUFF 0xC2000000
#define K3_SIP_OTP_WRITE 0xC2000001
#define K3_SIP_OTP_READ 0xC2000002
int fuse_read(u32 bank, u32 word, u32 *val)
{
struct arm_smccc_res res;
if (bank != 0U) {
printf("Invalid bank argument, ONLY bank 0 is supported\n");
return -EINVAL;
}
/* Make SiP SMC call and send the word in the parameter register */
arm_smccc_smc(K3_SIP_OTP_READ, word,
0, 0, 0, 0, 0, 0, &res);
*val = res.a1;
if (res.a0 != 0)
printf("SMC call failed: Error code %lu\n", res.a0);
return res.a0;
}
int fuse_sense(u32 bank, u32 word, u32 *val)
{
return -EPERM;
}
int fuse_prog(u32 bank, u32 word, u32 val)
{
struct arm_smccc_res res;
u32 mask = val;
if (bank != 0U) {
printf("Invalid bank argument, ONLY bank 0 is supported\n");
return -EINVAL;
}
/* Make SiP SMC call and send the word, val and mask in the parameter register */
arm_smccc_smc(K3_SIP_OTP_WRITE, word,
val, mask, 0, 0, 0, 0, &res);
if (res.a0 != 0)
printf("SMC call failed: Error code %lu\n", res.a0);
return res.a0;
}
int fuse_override(u32 bank, u32 word, u32 val)
{
return -EPERM;
}
int fuse_writebuff(ulong addr)
{
struct arm_smccc_res res;
/* Make SiP SMC call and send the addr in the parameter register */
arm_smccc_smc(K3_SIP_OTP_WRITEBUFF, (unsigned long)addr,
0, 0, 0, 0, 0, 0, &res);
if (res.a0 != 0)
printf("SMC call failed: Error code %lu\n", res.a0);
return res.a0;
}