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/*
* 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 "cbe_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 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 cbe_regs_map *regs;
} cbe_thread_map[NR_CPUS];
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;
np->data = cbe_find_map(tmp_np);
}
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;
}
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);
/* FIXME
* This is little more than a stub at the moment. It should be
* fleshed out so that it works for both SMT and non-SMT, no
* matter if the passed cpu is odd or even.
* For SMT enabled, returns 0 for even-numbered cpu; otherwise 1.
* For SMT disabled, returns 0 for all cpus.
*/
u32 cbe_get_hw_thread_id(int cpu)
{
return (cpu & 1);
}
EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
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 ! */
const 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 = get_property(cpu, "pervasive", NULL);
if (prop != NULL)
map->pmd_regs = ioremap(prop->address, prop->len);
prop = get_property(cpu, "iic", NULL);
if (prop != NULL)
map->iic_regs = ioremap(prop->address, prop->len);
prop = (struct address_prop *)get_property(cpu, "mic-tm",
NULL);
if (prop != NULL)
map->mic_tm_regs = ioremap(prop->address, prop->len);
}
}
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