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hw/nvram: Add BCM2835 OTP device

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The OTP device registers are currently stubbed. For now, the device
houses the OTP rows which will be accessed directly by other peripherals.

Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Rayhan Faizel 2024-05-19 15:11:04 +05:30 • committed by Peter Maydell
parent b6d32a06fc
commit c1bf754041
3 changed files with 256 additions and 0 deletions
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68
include/hw/nvram/bcm2835_otp.h Normal file
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/*
* BCM2835 One-Time Programmable (OTP) Memory
*
* Copyright (c) 2024 Rayhan Faizel <rayhan.faizel@gmail.com>
*
* SPDX-License-Identifier: MIT
*/
#ifndef BCM2835_OTP_H
#define BCM2835_OTP_H
#include "hw/sysbus.h"
#include "qom/object.h"
#define TYPE_BCM2835_OTP "bcm2835-otp"
OBJECT_DECLARE_SIMPLE_TYPE(BCM2835OTPState, BCM2835_OTP)
#define BCM2835_OTP_ROW_COUNT 66
/* https://elinux.org/BCM2835_registers#OTP */
#define BCM2835_OTP_BOOTMODE_REG 0x00
#define BCM2835_OTP_CONFIG_REG 0x04
#define BCM2835_OTP_CTRL_LO_REG 0x08
#define BCM2835_OTP_CTRL_HI_REG 0x0c
#define BCM2835_OTP_STATUS_REG 0x10
#define BCM2835_OTP_BITSEL_REG 0x14
#define BCM2835_OTP_DATA_REG 0x18
#define BCM2835_OTP_ADDR_REG 0x1c
#define BCM2835_OTP_WRITE_DATA_READ_REG 0x20
#define BCM2835_OTP_INIT_STATUS_REG 0x24
/* -- Row 32: Undocumented -- */
#define BCM2835_OTP_ROW_32 32
/* Lock OTP Programming (Customer OTP and private key) */
#define BCM2835_OTP_ROW_32_LOCK BIT(6)
/* -- Row 36-43: Customer OTP -- */
#define BCM2835_OTP_CUSTOMER_OTP 36
#define BCM2835_OTP_CUSTOMER_OTP_LEN 8
/* Magic numbers to lock programming of customer OTP and private key */
#define BCM2835_OTP_LOCK_NUM1 0xffffffff
#define BCM2835_OTP_LOCK_NUM2 0xaffe0000
/* -- Row 56-63: Device-specific private key -- */
#define BCM2835_OTP_PRIVATE_KEY 56
#define BCM2835_OTP_PRIVATE_KEY_LEN 8
struct BCM2835OTPState {
/* <private> */
SysBusDevice parent_obj;
/* <public> */
MemoryRegion iomem;
uint32_t otp_rows[BCM2835_OTP_ROW_COUNT];
};
uint32_t bcm2835_otp_get_row(BCM2835OTPState *s, unsigned int row);
void bcm2835_otp_set_row(BCM2835OTPState *s, unsigned int row, uint32_t value);
#endif