Some platforms require CONFIG_NO_IOPORT_MAP=y but would also support
qemu_fw_cfg over MMIO. Currently the qemu_fw_cfg module can't be built for
those as it needs HAS_IOPORT_MAP=y for ioport remapping.
This patch allows to build the qemu_fw_cfg in those cases. If
CONFIG_HAS_IOPORT_MAP=n, qemu_fw_cfg is built without support for ioport
based access.
Signed-off-by: Fabian Vogt <fv...@suse.de>
---
Applies on top of 6c1b980a7e79.
drivers/firmware/Kconfig | 1 -
drivers/firmware/qemu_fw_cfg.c | 5 +++++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index b59e3041fd62..f8aad7de8c72 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -156,7 +156,6 @@ 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 HAS_IOPORT_MAP
default n
help
Say Y or M here to enable the exporting of the QEMU firmware
diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index a69399a6b7c0..1d60ac74a403 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c
@@ -258,6 +258,7 @@ static int fw_cfg_do_platform_probe(struct platform_device
*pdev)
return -EFAULT;
}
} else {
+#ifdef CONFIG_HAS_IOPORT_MAP
if (!request_region(fw_cfg_p_base,
fw_cfg_p_size, "fw_cfg_io"))
return -EBUSY;
@@ -266,6 +267,10 @@ static int fw_cfg_do_platform_probe(struct platform_device
*pdev)
release_region(fw_cfg_p_base, fw_cfg_p_size);
return -EFAULT;
}
+#else
+ dev_err(&pdev->dev, "IO region given but
CONFIG_HAS_IOPORT_MAP=n");
+ return -EINVAL;
+#endif
}
/* were custom register offsets provided (e.g. on the command line)? */
--
2.41.0
