[OpenBIOS] [commit] r1307 - in trunk/openbios-devel: drivers include/arch/common

[repository service]

Author: agraf
Date: Sun Jul 13 18:19:50 2014
New Revision: 1307
URL: http://tracker.coreboot.org/trac/openbios/changeset/1307

Log:
Mac99: Support flat NVRAM

The mac99 machine is switching to use a flat NVRAM layout. Support
that hint and treat NVRAM as flat when we find it.

We keep the old (broken) shifted-by-1 way of accessing NVRAM around
to be able to use new OpenBIOS binaries on older QEMU versions.

Signed-off-by: Alexander Graf <agraf at suse.de>

Modified:
   trunk/openbios-devel/drivers/macio.c
   trunk/openbios-devel/include/arch/common/fw_cfg.h

Modified: trunk/openbios-devel/drivers/macio.c
==============================================================================
--- trunk/openbios-devel/drivers/macio.c	Fri May 30 14:11:44 2014	(r1306)
+++ trunk/openbios-devel/drivers/macio.c	Sun Jul 13 18:19:50 2014	(r1307)
@@ -27,20 +27,31 @@
 
 #define NW_IO_NVRAM_SIZE   0x00004000
 #define NW_IO_NVRAM_OFFSET 0xfff04000
-#define NW_IO_NVRAM_SHIFT  1
 
 #define IO_OPENPIC_SIZE    0x00040000
 #define IO_OPENPIC_OFFSET  0x00040000
 
 static char *nvram;
 
+static int macio_nvram_shift(void)
+{
+	int nvram_flat;
+
+        if (is_oldworld())
+                return OW_IO_NVRAM_SHIFT;
+
+	nvram_flat = fw_cfg_read_i32(FW_CFG_PPC_NVRAM_FLAT);
+	return nvram_flat ? 0 : 1;
+}
+
 int
 macio_get_nvram_size(void)
 {
+	int shift = macio_nvram_shift();
         if (is_oldworld())
-                return OW_IO_NVRAM_SIZE >> OW_IO_NVRAM_SHIFT;
+                return OW_IO_NVRAM_SIZE >> shift;
         else
-                return NW_IO_NVRAM_SIZE >> NW_IO_NVRAM_SHIFT;
+                return NW_IO_NVRAM_SIZE >> shift;
 }
 
 static unsigned long macio_nvram_offset(void)
@@ -123,12 +134,7 @@
 macio_nvram_put(char *buf)
 {
 	int i;
-        unsigned int it_shift;
-
-        if (is_oldworld())
-                it_shift = OW_IO_NVRAM_SHIFT;
-        else
-                it_shift = NW_IO_NVRAM_SHIFT;
+        unsigned int it_shift = macio_nvram_shift();
 
 	for (i=0; i< arch_nvram_size() ; i++)
 		nvram[i << it_shift] = buf[i];
@@ -142,12 +148,7 @@
 macio_nvram_get(char *buf)
 {
 	int i;
-        unsigned int it_shift;
-
-        if (is_oldworld())
-                it_shift = OW_IO_NVRAM_SHIFT;
-        else
-                it_shift = NW_IO_NVRAM_SHIFT;
+        unsigned int it_shift = macio_nvram_shift();
 
 	for (i=0; i< arch_nvram_size(); i++)
                 buf[i] = nvram[i << it_shift];

Modified: trunk/openbios-devel/include/arch/common/fw_cfg.h
==============================================================================
--- trunk/openbios-devel/include/arch/common/fw_cfg.h	Fri May 30 14:11:44 2014	(r1306)
+++ trunk/openbios-devel/include/arch/common/fw_cfg.h	Sun Jul 13 18:19:50 2014	(r1307)
@@ -46,6 +46,7 @@
 #define FW_CFG_PPC_KVM_PID	(FW_CFG_ARCH_LOCAL + 0x07)
 #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_INVALID          0xffff