[POWERPC] cell: add support for proper device-tree

This patch adds support for a proper device-tree.
A porper device-tree on cell contains be nodes
for each CBE containg nodes for SPEs and all the
other special devices on it.
Ofcourse oldschool devicetree is still supported.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

1 files changed, 88 insertions, 30 deletions

diff --git a/arch/powerpc/platforms/cell/cbe_regs.c b/arch/powerpc/platforms/cell/cbe_regs.c
index dca39c0af7ea..12c9674b4b1f 100644
--- a/arch/powerpc/platforms/cell/cbe_regs.c
+++ b/arch/powerpc/platforms/cell/cbe_regs.c
@@ -14,6 +14,8 @@
 #include <asm/pgtable.h>
 #include <asm/prom.h>
 #include <asm/ptrace.h>
+#include <asm/of_device.h>
+#include <asm/of_platform.h>
 
 #include "cbe_regs.h"
 
@@ -27,6 +29,7 @@
 static struct cbe_regs_map
 {
         struct device_node *cpu_node;
+        struct device_node *be_node;
         struct cbe_pmd_regs __iomem *pmd_regs;
         struct cbe_iic_regs __iomem *iic_regs;
         struct cbe_mic_tm_regs __iomem *mic_tm_regs;
@@ -37,6 +40,7 @@ static int cbe_regs_map_count;
 static struct cbe_thread_map
 {
         struct device_node *cpu_node;
+        struct device_node *be_node;
         struct cbe_regs_map *regs;
         unsigned int thread_id;
         unsigned int cbe_id;
@@ -50,22 +54,29 @@ static struct cbe_regs_map *cbe_find_map(struct device_node *np)
         int i;
         struct device_node *tmp_np;
 
-        if (strcasecmp(np->type, "spe") == 0) {
-                if (np->data == NULL) {
-                        /* walk up path until cpu node was found */
-                        tmp_np = np->parent;
-                        while (tmp_np != NULL && strcasecmp(tmp_np->type, "cpu") != 0)
-                                tmp_np = tmp_np->parent;
+        if (strcasecmp(np->type, "spe")) {
+                for (i = 0; i < cbe_regs_map_count; i++)
+                        if (cbe_regs_maps[i].cpu_node == np ||
+                            cbe_regs_maps[i].be_node == np)
+                                return &cbe_regs_maps[i];
+                return NULL;
+        }
 
-                        np->data = cbe_find_map(tmp_np);
-                }
+        if (np->data)
                 return np->data;
-        }
 
-        for (i = 0; i < cbe_regs_map_count; i++)
-                if (cbe_regs_maps[i].cpu_node == np)
-                        return &cbe_regs_maps[i];
-        return NULL;
+        /* walk up path until cpu or be node was found */
+        tmp_np = np;
+        do {
+                tmp_np = tmp_np->parent;
+                /* on a correct devicetree we wont get up to root */
+                BUG_ON(!tmp_np);
+        } while (strcasecmp(tmp_np->type, "cpu") &&
+                 strcasecmp(tmp_np->type, "be"));
+
+        np->data = cbe_find_map(tmp_np);
+
+        return np->data;
 }
 
 struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
@@ -153,6 +164,67 @@ u32 cbe_node_to_cpu(int node)
 }
 EXPORT_SYMBOL_GPL(cbe_node_to_cpu);
 
+static struct device_node *cbe_get_be_node(int cpu_id)
+{
+        struct device_node *np;
+
+        for_each_node_by_type (np, "be") {
+                int len,i;
+                const phandle *cpu_handle;
+
+                cpu_handle = of_get_property(np, "cpus", &len);
+
+                for (i=0; i<len; i++)
+                        if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL))
+                                return np;
+        }
+
+        return NULL;
+}
+
+void __init cbe_fill_regs_map(struct cbe_regs_map *map)
+{
+        if(map->be_node) {
+                struct device_node *be, *np;
+
+                be = map->be_node;
+
+                for_each_node_by_type(np, "pervasive")
+                        if (of_get_parent(np) == be)
+                                map->pmd_regs = of_iomap(np, 0);
+
+                for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller")
+                        if (of_get_parent(np) == be)
+                                map->iic_regs = of_iomap(np, 2);
+
+                for_each_node_by_type(np, "mic-tm")
+                        if (of_get_parent(np) == be)
+                                map->mic_tm_regs = of_iomap(np, 0);
+        } else {
+                struct device_node *cpu;
+                /* That hack must die die die ! */
+                const struct address_prop {
+                        unsigned long address;
+                        unsigned int len;
+                } __attribute__((packed)) *prop;
+
+                cpu = map->cpu_node;
+
+                prop = of_get_property(cpu, "pervasive", NULL);
+                if (prop != NULL)
+                        map->pmd_regs = ioremap(prop->address, prop->len);
+
+                prop = of_get_property(cpu, "iic", NULL);
+                if (prop != NULL)
+                        map->iic_regs = ioremap(prop->address, prop->len);
+
+                prop = of_get_property(cpu, "mic-tm", NULL);
+                if (prop != NULL)
+                        map->mic_tm_regs = ioremap(prop->address, prop->len);
+        }
+}
+
+
 void __init cbe_regs_init(void)
 {
         int i;
@@ -162,6 +234,7 @@ void __init cbe_regs_init(void)
         /* Build local fast map of CPUs */
         for_each_possible_cpu(i) {
                 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
+                cbe_thread_map[i].be_node = cbe_get_be_node(i);
                 cbe_thread_map[i].thread_id = thread_id;
         }
 
@@ -170,12 +243,6 @@ void __init cbe_regs_init(void)
                 struct cbe_regs_map *map;
                 unsigned int cbe_id;
 
-                /* That hack must die die die ! */
-                const struct address_prop {
-                        unsigned long address;
-                        unsigned int len;
-                } __attribute__((packed)) *prop;
-
                 cbe_id = cbe_regs_map_count++;
                 map = &cbe_regs_maps[cbe_id];
 
@@ -193,23 +260,14 @@ void __init cbe_regs_init(void)
                         if (thread->cpu_node == cpu) {
                                 thread->regs = map;
                                 thread->cbe_id = cbe_id;
+                                map->be_node = thread->be_node;
                                 cpu_set(i, cbe_local_mask[cbe_id]);
                                 if(thread->thread_id == 0)
                                         cpu_set(i, cbe_first_online_cpu);
                         }
                 }
 
-                prop = of_get_property(cpu, "pervasive", NULL);
-                if (prop != NULL)
-                        map->pmd_regs = ioremap(prop->address, prop->len);
-
-                prop = of_get_property(cpu, "iic", NULL);
-                if (prop != NULL)
-                        map->iic_regs = ioremap(prop->address, prop->len);
-
-                prop = of_get_property(cpu, "mic-tm", NULL);
-                if (prop != NULL)
-                        map->mic_tm_regs = ioremap(prop->address, prop->len);
+                cbe_fill_regs_map(map);
         }
 }