This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / platforms / cell / cbe_regs.c

diff --git a/arch/powerpc/platforms/cell/cbe_regs.c b/arch/powerpc/platforms/cell/cbe_regs.c
new file mode 100644 (file)
index 0000000..7315f66
--- /dev/null
+++ b/arch/powerpc/platforms/cell/cbe_regs.c
@@ -0,0 +1,126 @@
+/*
+ * cbe_regs.c
+ *
+ * Accessor routines for the various MMIO register blocks of the CBE
+ *
+ * (c) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
+ */
+
+#include <linux/percpu.h>
+#include <linux/types.h>
+
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/prom.h>
+#include <asm/ptrace.h>
+
+#include "cbe_regs.h"
+
+#define MAX_CBE                2
+
+/*
+ * Current implementation uses "cpu" nodes. We build our own mapping
+ * array of cpu numbers to cpu nodes locally for now to allow interrupt
+ * time code to have a fast path rather than call of_get_cpu_node(). If
+ * we implement cpu hotplug, we'll have to install an appropriate norifier
+ * in order to release references to the cpu going away
+ */
+static struct cbe_regs_map
+{
+       struct device_node *cpu_node;
+       struct cbe_pmd_regs __iomem *pmd_regs;
+       struct cbe_iic_regs __iomem *iic_regs;
+} cbe_regs_maps[MAX_CBE];
+static int cbe_regs_map_count;
+
+static struct cbe_thread_map
+{
+       struct device_node *cpu_node;
+       struct cbe_regs_map *regs;
+} cbe_thread_map[NR_CPUS];
+
+static struct cbe_regs_map *cbe_find_map(struct device_node *np)
+{
+       int i;
+
+       for (i = 0; i < cbe_regs_map_count; i++)
+               if (cbe_regs_maps[i].cpu_node == np)
+                       return &cbe_regs_maps[i];
+       return NULL;
+}
+
+struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
+{
+       struct cbe_regs_map *map = cbe_find_map(np);
+       if (map == NULL)
+               return NULL;
+       return map->pmd_regs;
+}
+
+struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu)
+{
+       struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
+       if (map == NULL)
+               return NULL;
+       return map->pmd_regs;
+}
+
+
+struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np)
+{
+       struct cbe_regs_map *map = cbe_find_map(np);
+       if (map == NULL)
+               return NULL;
+       return map->iic_regs;
+}
+struct cbe_iic_regs __iomem *cbe_get_cpu_iic_regs(int cpu)
+{
+       struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
+       if (map == NULL)
+               return NULL;
+       return map->iic_regs;
+}
+
+void __init cbe_regs_init(void)
+{
+       int i;
+       struct device_node *cpu;
+
+       /* Build local fast map of CPUs */
+       for_each_possible_cpu(i)
+               cbe_thread_map[i].cpu_node = of_get_cpu_node(i, NULL);
+
+       /* Find maps for each device tree CPU */
+       for_each_node_by_type(cpu, "cpu") {
+               struct cbe_regs_map *map = &cbe_regs_maps[cbe_regs_map_count++];
+
+               /* That hack must die die die ! */
+               struct address_prop {
+                       unsigned long address;
+                       unsigned int len;
+               } __attribute__((packed)) *prop;
+
+
+               if (cbe_regs_map_count > MAX_CBE) {
+                       printk(KERN_ERR "cbe_regs: More BE chips than supported"
+                              "!\n");
+                       cbe_regs_map_count--;
+                       return;
+               }
+               map->cpu_node = cpu;
+               for_each_possible_cpu(i)
+                       if (cbe_thread_map[i].cpu_node == cpu)
+                               cbe_thread_map[i].regs = map;
+
+               prop = (struct address_prop *)get_property(cpu, "pervasive",
+                                                          NULL);
+               if (prop != NULL)
+                       map->pmd_regs = ioremap(prop->address, prop->len);
+
+               prop = (struct address_prop *)get_property(cpu, "iic",
+                                                          NULL);
+               if (prop != NULL)
+                       map->iic_regs = ioremap(prop->address, prop->len);
+       }
+}
+