[PATCH] [PATCH] drivers/firmware/qemu_fw_cfg: add RISCV support

[xiaoming]

In the latest release of qemu (qemu 6.0.0 or higher) riscv virt already 
supports fw_cfg, but
drivers/firmware/qemu_fw_cfg not support.

Signed-off-by: xiaoming <2014500726@smail.xtu.edu.cn>
---
 drivers/firmware/Kconfig       | 2 +-
 drivers/firmware/qemu_fw_cfg.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 1db738d5b..4eb8d8a3a 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -186,7 +186,7 @@ config RASPBERRYPI_FIRMWARE
 
 config FW_CFG_SYSFS
        tristate "QEMU fw_cfg device support in sysfs"
-       depends on SYSFS && (ARM || ARM64 || PARISC || PPC_PMAC || SPARC || X86)
+       depends on SYSFS && (ARM || ARM64 || PARISC || PPC_PMAC || SPARC || X86 
|| RISCV)
        depends on HAS_IOPORT_MAP
        default n
        help
diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index 172c751a4..36b5b2612 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c
@@ -225,6 +225,10 @@ static void fw_cfg_io_cleanup(void)
 #  define FW_CFG_CTRL_OFF 0x00
 #  define FW_CFG_DATA_OFF 0x01
 #  define FW_CFG_DMA_OFF 0x04
+# elif defined(CONFIG_RISCV)
+#  define FW_CFG_CTRL_OFF 0x08
+#  define FW_CFG_DATA_OFF 0x00
+#  define FW_CFG_DMA_OFF 0x10
 # else
 #  error "QEMU FW_CFG not available on this architecture!"
 # endif
-- 
2.17.1