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hw/misc/sifive_u_otp: Add write function and write-once protection

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- Add write operation to update fuse data bit when PWE bit is on.
 - Add array, fuse_wo, to store the 'written' status for all bits
   of OTP to block the write operation.

Signed-off-by: Green Wan <green.wan@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Bin Meng <bin.meng@windriver.com>
Message-id: 20201020033732.12921-2-green.wan@sifive.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Green Wan 2020-10-20 11:37:31 +08:00 • committed by Alistair Francis
parent 33a9a57d2c
commit a54d259157
2 changed files with 32 additions and 1 deletions
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3
include/hw/misc/sifive_u_otp.h
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@ -36,6 +36,8 @@
#define SIFIVE_U_OTP_PTRIM 0x34
#define SIFIVE_U_OTP_PWE 0x38
#define SIFIVE_U_OTP_PWE_EN (1 << 0)
#define SIFIVE_U_OTP_PCE_EN (1 << 0)
#define SIFIVE_U_OTP_PDSTB_EN (1 << 0)
@ -75,6 +77,7 @@ struct SiFiveUOTPState {
uint32_t ptrim;
uint32_t pwe;
uint32_t fuse[SIFIVE_U_OTP_NUM_FUSES];
uint32_t fuse_wo[SIFIVE_U_OTP_NUM_FUSES];
/* config */
uint32_t serial;
};