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