stm32mp1: add FUSE command support
Add support of fuse command (read/write/program/sense)
on bank 0 to access to BSEC SAFMEM (4096 OTP bits).
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/misc/stm32mp_fuse.c b/drivers/misc/stm32mp_fuse.c
new file mode 100644
index 0000000..2d66135
--- /dev/null
+++ b/drivers/misc/stm32mp_fuse.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ */
+
+#include <common.h>
+#include <command.h>
+#include <misc.h>
+#include <errno.h>
+#include <dm/device.h>
+#include <dm/uclass.h>
+
+#define STM32MP_OTP_BANK 0
+
+/*
+ * The 'fuse' command API
+ */
+int fuse_read(u32 bank, u32 word, u32 *val)
+{
+ int ret = 0;
+ struct udevice *dev;
+
+ switch (bank) {
+ case STM32MP_OTP_BANK:
+ ret = uclass_get_device_by_driver(UCLASS_MISC,
+ DM_GET_DRIVER(stm32mp_bsec),
+ &dev);
+ if (ret)
+ return ret;
+ ret = misc_read(dev, word * 4 + STM32_BSEC_SHADOW_OFFSET,
+ val, 4);
+ break;
+
+ default:
+ printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+int fuse_prog(u32 bank, u32 word, u32 val)
+{
+ struct udevice *dev;
+ int ret;
+
+ switch (bank) {
+ case STM32MP_OTP_BANK:
+ ret = uclass_get_device_by_driver(UCLASS_MISC,
+ DM_GET_DRIVER(stm32mp_bsec),
+ &dev);
+ if (ret)
+ return ret;
+ ret = misc_write(dev, word * 4 + STM32_BSEC_OTP_OFFSET,
+ &val, 4);
+ break;
+
+ default:
+ printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+int fuse_sense(u32 bank, u32 word, u32 *val)
+{
+ struct udevice *dev;
+ int ret;
+
+ switch (bank) {
+ case STM32MP_OTP_BANK:
+ ret = uclass_get_device_by_driver(UCLASS_MISC,
+ DM_GET_DRIVER(stm32mp_bsec),
+ &dev);
+ if (ret)
+ return ret;
+ ret = misc_read(dev, word * 4 + STM32_BSEC_OTP_OFFSET, val, 4);
+ break;
+
+ default:
+ printf("stm32mp %s: wrong value for bank %i\n", __func__, bank);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+int fuse_override(u32 bank, u32 word, u32 val)
+{
+ struct udevice *dev;
+ int ret;
+
+ switch (bank) {
+ case STM32MP_OTP_BANK:
+ ret = uclass_get_device_by_driver(UCLASS_MISC,
+ DM_GET_DRIVER(stm32mp_bsec),
+ &dev);
+ if (ret)
+ return ret;
+ ret = misc_write(dev, word * 4 + STM32_BSEC_SHADOW_OFFSET,
+ &val, 4);
+ break;
+
+ default:
+ printf("stm32mp %s: wrong value for bank %i\n",
+ __func__, bank);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}