[OpenBIOS] [PATCH 1/5] ppc: add fw_cfg interface for passing VIA/ADB configuration from QEMU

[Mark Cave-Ayland]

This is in preparation for allowing OpenBIOS to detect the difference
between CUDA/PMU hardware and build the device tree accordingly.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
---
 arch/ppc/qemu/init.c         | 19 +++++++++++++++++++
 include/arch/common/fw_cfg.h |  1 +
 include/drivers/drivers.h    | 10 ++++++++++
 3 files changed, 30 insertions(+)

diff --git a/arch/ppc/qemu/init.c b/arch/ppc/qemu/init.c
index 06fd08d..eba93c9 100644
--- a/arch/ppc/qemu/init.c
+++ b/arch/ppc/qemu/init.c
@@ -92,6 +92,25 @@ int is_newworld(void)
            (machine_id == ARCH_MAC99_U3);
 }
 
+#define CORE99_VIA_CONFIG_CUDA     0x0
+#define CORE99_VIA_CONFIG_PMU      0x1
+#define CORE99_VIA_CONFIG_PMU_ADB  0x2
+
+int has_pmu(void)
+{
+    uint32_t via_config = fw_cfg_read_i32(FW_CFG_PPC_VIACONFIG);
+
+    return (via_config != CORE99_VIA_CONFIG_CUDA);
+}
+
+int has_adb(void)
+{
+    uint32_t via_config = fw_cfg_read_i32(FW_CFG_PPC_VIACONFIG);
+
+    return (via_config == CORE99_VIA_CONFIG_CUDA ||
+            via_config == CORE99_VIA_CONFIG_PMU_ADB);
+}
+
 static const pci_arch_t known_arch[] = {
     [ARCH_PREP] = {
         .name = "PREP",
diff --git a/include/arch/common/fw_cfg.h b/include/arch/common/fw_cfg.h
index cd2183a..8460ad4 100644
--- a/include/arch/common/fw_cfg.h
+++ b/include/arch/common/fw_cfg.h
@@ -47,6 +47,7 @@
 #define FW_CFG_PPC_NVRAM_ADDR	(FW_CFG_ARCH_LOCAL + 0x08)
 #define FW_CFG_PPC_BUSFREQ      (FW_CFG_ARCH_LOCAL + 0x09)
 #define FW_CFG_PPC_NVRAM_FLAT   (FW_CFG_ARCH_LOCAL + 0x0a)
+#define FW_CFG_PPC_VIACONFIG    (FW_CFG_ARCH_LOCAL + 0x0b)
 
 #define FW_CFG_INVALID          0xffff
 
diff --git a/include/drivers/drivers.h b/include/drivers/drivers.h
index 38efcc8..117429e 100644
--- a/include/drivers/drivers.h
+++ b/include/drivers/drivers.h
@@ -23,6 +23,8 @@ int ob_pci_init(void);
 extern int is_apple(void);
 extern int is_oldworld(void);
 extern int is_newworld(void);
+extern int has_pmu(void);
+extern int has_adb(void);
 #else
 static inline int is_apple(void)
 {
@@ -36,6 +38,14 @@ static inline int is_newworld(void)
 {
 	return 0;
 }
+static inline int has_pmu(void)
+{
+	return 0;
+}
+static inline int has_adb(void)
+{
+	return 0;
+}
 #endif
 #define AAPL(_cmd)      do { if (is_apple()) _cmd; } while(0)
 #define OLDWORLD(_cmd)  do { if (is_oldworld()) _cmd; } while(0)
-- 
2.11.0