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| author | Gabriel Somlo <somlo@cmu.edu> | 2016-01-28 09:23:11 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-09 17:37:39 -0800 |
| commit | 75f3e8e47f381074801d0034874d20c638d9e3d9 (patch) | |
| tree | b6d6e20113c38b04c126747144a162055f7e7a69 /drivers/firmware/Kconfig | |
| parent | 2fe829aca9d7bed5fd6b49c6a1452e5e486b6cc3 (diff) | |
| download | linux-75f3e8e47f381074801d0034874d20c638d9e3d9.tar.gz | |
firmware: introduce sysfs driver for QEMU's fw_cfg device
Make fw_cfg entries of type "file" available via sysfs. Entries are listed under /sys/firmware/qemu_fw_cfg/by_key, in folders named after each entry's selector key. Filename, selector value, and size read-only attributes are included for each entry. Also, a "raw" attribute allows retrieval of the full binary content of each entry. The fw_cfg device can be instantiated automatically from ACPI or the Device Tree, or manually by using a kernel module (or command line) parameter, with a syntax outlined in the documentation file. Signed-off-by: Gabriel Somlo <somlo@cmu.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/firmware/Kconfig')
| -rw-r--r-- | drivers/firmware/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index 49a3a1185bb6..5130f74ae3bd 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -161,6 +161,25 @@ config RASPBERRYPI_FIRMWARE This option enables support for communicating with the firmware on the Raspberry Pi. +config FW_CFG_SYSFS + tristate "QEMU fw_cfg device support in sysfs" + depends on SYSFS && (ARM || ARM64 || PPC_PMAC || SPARC || X86) + default n + help + Say Y or M here to enable the exporting of the QEMU firmware + configuration (fw_cfg) file entries via sysfs. Entries are + found under /sys/firmware/fw_cfg when this option is enabled + and loaded. + +config FW_CFG_SYSFS_CMDLINE + bool "QEMU fw_cfg device parameter parsing" + depends on FW_CFG_SYSFS + help + Allow the qemu_fw_cfg device to be initialized via the kernel + command line or using a module parameter. + WARNING: Using incorrect parameters (base address in particular) + may crash your system. + config QCOM_SCM bool depends on ARM || ARM64 |