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>

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index cd4afe1..087cbef 100644 (file)
--- 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 9298f22..7ab2f2a 100644 (file)
--- 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
 }