stm32mp1: add support for virtual partition read

Add read for OTP and PMIC NVM with alternates
on virtual DFU device.

Serie-cc: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 23f36e8f42..4ed2d88849 100644
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -992,9 +992,92 @@ void set_dfu_alt_info(char *interface, char *devstr)
 	if (!IS_ERR_OR_NULL(mtd))
 		board_get_alt_info("spi-nand0", buf);
 
+#ifdef CONFIG_DFU_VIRT
+	strncat(buf, "&virt 0=OTP", DFU_ALT_BUF_LEN);
+
+	if (IS_ENABLED(CONFIG_PMIC_STPMIC1))
+		strncat(buf, "&virt 1=PMIC", DFU_ALT_BUF_LEN);
+#endif
+
 	env_set("dfu_alt_info", buf);
 	puts("DFU alt info setting: done\n");
 }
+
+#if CONFIG_IS_ENABLED(DFU_VIRT)
+#include <dfu.h>
+#include <power/stpmic1.h>
+
+int dfu_otp_read(u64 offset, u8 *buffer, long *size)
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_MISC,
+					  DM_GET_DRIVER(stm32mp_bsec),
+					  &dev);
+	if (ret)
+		return ret;
+
+	ret = misc_read(dev, offset + STM32_BSEC_OTP_OFFSET, buffer, *size);
+	if (ret >= 0) {
+		*size = ret;
+		ret = 0;
+	}
+
+	return 0;
+}
+
+int dfu_pmic_read(u64 offset, u8 *buffer, long *size)
+{
+	int ret;
+#ifdef CONFIG_PMIC_STPMIC1
+	struct udevice *dev;
+
+	ret = uclass_get_device_by_driver(UCLASS_MISC,
+					  DM_GET_DRIVER(stpmic1_nvm),
+					  &dev);
+	if (ret)
+		return ret;
+
+	ret = misc_read(dev, 0xF8 + offset, buffer, *size);
+	if (ret >= 0) {
+		*size = ret;
+		ret = 0;
+	}
+	if (ret == -EACCES) {
+		*size = 0;
+		ret = 0;
+	}
+#else
+	pr_err("PMIC update not supported");
+	ret = -EOPNOTSUPP;
+#endif
+
+	return ret;
+}
+
+int dfu_read_medium_virt(struct dfu_entity *dfu, u64 offset,
+			 void *buf, long *len)
+{
+	switch (dfu->data.virt.dev_num) {
+	case 0x0:
+		return dfu_otp_read(offset, buf, len);
+	case 0x1:
+		return dfu_pmic_read(offset, buf, len);
+	}
+	*len = 0;
+	return 0;
+}
+
+int __weak dfu_get_medium_size_virt(struct dfu_entity *dfu, u64 *size)
+{
+	*size = SZ_1K;
+
+	return 0;
+}
+
+#endif
+
 #endif
 
 static void board_copro_image_process(ulong fw_image, size_t fw_size)