hw/misc/sifive_u_otp: Do not reset OTP content on hardware reset

Once a "One Time Programmable" is programmed, it shouldn't be reset.

Do not re-initialize the OTP content in the DeviceReset handler,
initialize it once in the DeviceRealize one.

Fixes: 9fb45c62ae8 ("riscv: sifive: Implement a model for SiFive FU540 OTP")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20211119104757.331579-1-f4bug@amsat.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/hw/misc/sifive_u_otp.c b/hw/misc/sifive_u_otp.c
index cf6098ff2c30422158ac17059a388b9381c6a4b9..52fdb750c0e7297f8304df35f65e0735cf2e4472 100644 (file)
--- a/hw/misc/sifive_u_otp.c
+++ b/hw/misc/sifive_u_otp.c
@@ -242,14 +242,10 @@ static void sifive_u_otp_realize(DeviceState *dev, Error **errp)
 
             if (blk_pread(s->blk, 0, s->fuse, filesize) != filesize) {
                 error_setg(errp, "failed to read the initial flash content");
+                return;
             }
         }
     }
-}
-
-static void sifive_u_otp_reset(DeviceState *dev)
-{
-    SiFiveUOTPState *s = SIFIVE_U_OTP(dev);
 
     /* Initialize all fuses' initial value to 0xFFs */
     memset(s->fuse, 0xff, sizeof(s->fuse));
@@ -266,13 +262,15 @@ static void sifive_u_otp_reset(DeviceState *dev)
         serial_data = s->serial;
         if (blk_pwrite(s->blk, index * SIFIVE_U_OTP_FUSE_WORD,
                        &serial_data, SIFIVE_U_OTP_FUSE_WORD, 0) < 0) {
-            error_report("write error index<%d>", index);
+            error_setg(errp, "failed to write index<%d>", index);
+            return;
         }
 
         serial_data = ~(s->serial);
         if (blk_pwrite(s->blk, (index + 1) * SIFIVE_U_OTP_FUSE_WORD,
                        &serial_data, SIFIVE_U_OTP_FUSE_WORD, 0) < 0) {
-            error_report("write error index<%d>", index + 1);
+            error_setg(errp, "failed to write index<%d>", index + 1);
+            return;
         }
     }
 
@@ -286,7 +284,6 @@ static void sifive_u_otp_class_init(ObjectClass *klass, void *data)
 
     device_class_set_props(dc, sifive_u_otp_properties);
     dc->realize = sifive_u_otp_realize;
-    dc->reset = sifive_u_otp_reset;
 }
 
 static const TypeInfo sifive_u_otp_info = {