powerpc: Export CMO_PageSize

[linux-2.6-omap-h63xx.git] / arch / powerpc / platforms / pseries / setup.c

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 063a0d2fba30e2576771a300460220c4e21c4cec..7b01d67b4e48ca40dd4d053ae02a59edc702b326 100644 (file)
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -68,6 +68,10 @@
 #include "plpar_wrappers.h"
 #include "pseries.h"
 
+int CMO_PrPSP = -1;
+int CMO_SecPSP = -1;
+unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
+EXPORT_SYMBOL(CMO_PageSize);
 
 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
 
@@ -325,8 +329,7 @@ void pSeries_cmo_feature_init(void)
 {
        char *ptr, *key, *value, *end;
        int call_status;
-       int PrPSP = -1;
-       int SecPSP = -1;
+       int page_order = IOMMU_PAGE_SHIFT;
 
        pr_debug(" -> fw_cmo_feature_init()\n");
        spin_lock(&rtas_data_buf_lock);
@@ -365,21 +368,31 @@ void pSeries_cmo_feature_init(void)
                                break;
                        }
 
-                       if (0 == strcmp(key, "PrPSP"))
-                               PrPSP = simple_strtol(value, NULL, 10);
+                       if (0 == strcmp(key, "CMOPageSize"))
+                               page_order = simple_strtol(value, NULL, 10);
+                       else if (0 == strcmp(key, "PrPSP"))
+                               CMO_PrPSP = simple_strtol(value, NULL, 10);
                        else if (0 == strcmp(key, "SecPSP"))
-                               SecPSP = simple_strtol(value, NULL, 10);
+                               CMO_SecPSP = simple_strtol(value, NULL, 10);
                        value = key = ptr + 1;
                }
                ptr++;
        }
 
-       if (PrPSP != -1 || SecPSP != -1) {
+       /* Page size is returned as the power of 2 of the page size,
+        * convert to the page size in bytes before returning
+        */
+       CMO_PageSize = 1 << page_order;
+       pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
+
+       if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
                pr_info("CMO enabled\n");
-               pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", PrPSP, SecPSP);
+               pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
+                        CMO_SecPSP);
                powerpc_firmware_features |= FW_FEATURE_CMO;
        } else
-               pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", PrPSP, SecPSP);
+               pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
+                        CMO_SecPSP);
        spin_unlock(&rtas_data_buf_lock);
        pr_debug(" <- fw_cmo_feature_init()\n");
 }