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cbe_regs.c

/*
 * 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 <linux/module.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
#include <asm/cell-regs.h>

/*
 * 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 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;
      struct cbe_pmd_shadow_regs pmd_shadow_regs;
} cbe_regs_maps[MAX_CBE];
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;
} cbe_thread_map[NR_CPUS];

static cpumask_t cbe_local_mask[MAX_CBE] = { [0 ... MAX_CBE-1] = CPU_MASK_NONE };
static cpumask_t cbe_first_online_cpu = CPU_MASK_NONE;

static struct cbe_regs_map *cbe_find_map(struct device_node *np)
{
      int i;
      struct device_node *tmp_np;

      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;
      }

      if (np->data)
            return np->data;

      /* 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)
{
      struct cbe_regs_map *map = cbe_find_map(np);
      if (map == NULL)
            return NULL;
      return map->pmd_regs;
}
EXPORT_SYMBOL_GPL(cbe_get_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;
}
EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs);

struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np)
{
      struct cbe_regs_map *map = cbe_find_map(np);
      if (map == NULL)
            return NULL;
      return &map->pmd_shadow_regs;
}

struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu)
{
      struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
      if (map == NULL)
            return NULL;
      return &map->pmd_shadow_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;
}

struct cbe_mic_tm_regs __iomem *cbe_get_mic_tm_regs(struct device_node *np)
{
      struct cbe_regs_map *map = cbe_find_map(np);
      if (map == NULL)
            return NULL;
      return map->mic_tm_regs;
}

struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu)
{
      struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
      if (map == NULL)
            return NULL;
      return map->mic_tm_regs;
}
EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);

u32 cbe_get_hw_thread_id(int cpu)
{
      return cbe_thread_map[cpu].thread_id;
}
EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);

u32 cbe_cpu_to_node(int cpu)
{
      return cbe_thread_map[cpu].cbe_id;
}
EXPORT_SYMBOL_GPL(cbe_cpu_to_node);

u32 cbe_node_to_cpu(int node)
{
      return find_first_bit( (unsigned long *) &cbe_local_mask[node], sizeof(cpumask_t));
}
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);

            /*
             * the CAB SLOF tree is non compliant, so we just assume
             * there is only one node
             */
            if (WARN_ON_ONCE(!cpu_handle))
                  return np;

            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;
      unsigned int thread_id;
      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, &thread_id);
            cbe_thread_map[i].be_node = cbe_get_be_node(i);
            cbe_thread_map[i].thread_id = thread_id;
      }

      /* Find maps for each device tree CPU */
      for_each_node_by_type(cpu, "cpu") {
            struct cbe_regs_map *map;
            unsigned int cbe_id;

            cbe_id = cbe_regs_map_count++;
            map = &cbe_regs_maps[cbe_id];

            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) {
                  struct cbe_thread_map *thread = &cbe_thread_map[i];

                  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);
                  }
            }

            cbe_fill_regs_map(map);
      }
}


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