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| author | Helge Deller <deller@gmx.de> | 2020-08-29 10:02:38 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2020-10-15 08:10:37 +0200 |
| commit | 024f5b597564acced9e69305f7a9ef1202186a61 (patch) | |
| tree | 76f0f5fef665bb5392f44dd7f0634cf765d318f8 | |
| parent | 6b698713d4e99e5a64e2d07f0df90545809227b9 (diff) | |
| download | linux-024f5b597564acced9e69305f7a9ef1202186a61.tar.gz | |
parisc: Add qemu fw_cfg interface
When running on qemu, SeaBIOS-hppa stores the iomem address for the emulated fw_cfg port in PAGE0_>pad0[2/3]. Let the Linux driver auto-configure the fw_cfg interface with it, so that the fw_cfg info shows up in /sys/firmware/qemu_fw_cfg. Signed-off-by: Helge Deller <deller@gmx.de>
| -rw-r--r-- | arch/parisc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/parisc/kernel/inventory.c | 30 |
2 files changed, 31 insertions, 0 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index cd4afe1e7a6c..087cbef348e6 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -376,5 +376,6 @@ config KEXEC_FILE endmenu +source "drivers/firmware/Kconfig" source "drivers/parisc/Kconfig" diff --git a/arch/parisc/kernel/inventory.c b/arch/parisc/kernel/inventory.c index 9298f2285510..7ab2f2a54400 100644 --- a/arch/parisc/kernel/inventory.c +++ b/arch/parisc/kernel/inventory.c @@ -19,6 +19,7 @@ #include <linux/init.h> #include <linux/slab.h> #include <linux/mm.h> +#include <linux/platform_device.h> #include <asm/hardware.h> #include <asm/io.h> #include <asm/mmzone.h> @@ -641,4 +642,33 @@ void __init do_device_inventory(void) if (pa_serialize_tlb_flushes) pr_info("Merced bus found: Enable PxTLB serialization.\n"); #endif + +#if defined(CONFIG_FW_CFG_SYSFS) + if (running_on_qemu) { + struct resource res[3] = {0,}; + unsigned int base; + + base = ((unsigned long long) PAGE0->pad0[2] << 32) + | PAGE0->pad0[3]; /* SeaBIOS stored it here */ + + res[0].name = "fw_cfg"; + res[0].start = base; + res[0].end = base + 8 - 1; + res[0].flags = IORESOURCE_MEM; + + res[1].name = "ctrl"; + res[1].start = 0; + res[1].flags = IORESOURCE_REG; + + res[2].name = "data"; + res[2].start = 4; + res[2].flags = IORESOURCE_REG; + + if (base) { + pr_info("Found qemu fw_cfg interface at %#08x\n", base); + platform_device_register_simple("fw_cfg", + PLATFORM_DEVID_NONE, res, 3); + } + } +#endif } |