4 * Accessor routines for the various MMIO register blocks of the CBE
6 * (c) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
10 #include <linux/config.h>
11 #include <linux/percpu.h>
12 #include <linux/types.h>
15 #include <asm/pgtable.h>
17 #include <asm/ptrace.h>
24 * Current implementation uses "cpu" nodes. We build our own mapping
25 * array of cpu numbers to cpu nodes locally for now to allow interrupt
26 * time code to have a fast path rather than call of_get_cpu_node(). If
27 * we implement cpu hotplug, we'll have to install an appropriate norifier
28 * in order to release references to the cpu going away
30 static struct cbe_regs_map
32 struct device_node *cpu_node;
33 struct cbe_pmd_regs __iomem *pmd_regs;
34 struct cbe_iic_regs __iomem *iic_regs;
35 } cbe_regs_maps[MAX_CBE];
36 static int cbe_regs_map_count;
38 static struct cbe_thread_map
40 struct device_node *cpu_node;
41 struct cbe_regs_map *regs;
42 } cbe_thread_map[NR_CPUS];
44 static struct cbe_regs_map *cbe_find_map(struct device_node *np)
48 for (i = 0; i < cbe_regs_map_count; i++)
49 if (cbe_regs_maps[i].cpu_node == np)
50 return &cbe_regs_maps[i];
54 struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
56 struct cbe_regs_map *map = cbe_find_map(np);
62 struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu)
64 struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
71 struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np)
73 struct cbe_regs_map *map = cbe_find_map(np);
78 struct cbe_iic_regs __iomem *cbe_get_cpu_iic_regs(int cpu)
80 struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
86 void __init cbe_regs_init(void)
89 struct device_node *cpu;
91 /* Build local fast map of CPUs */
92 for_each_possible_cpu(i)
93 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, NULL);
95 /* Find maps for each device tree CPU */
96 for_each_node_by_type(cpu, "cpu") {
97 struct cbe_regs_map *map = &cbe_regs_maps[cbe_regs_map_count++];
99 /* That hack must die die die ! */
100 const struct address_prop {
101 unsigned long address;
103 } __attribute__((packed)) *prop;
106 if (cbe_regs_map_count > MAX_CBE) {
107 printk(KERN_ERR "cbe_regs: More BE chips than supported"
109 cbe_regs_map_count--;
113 for_each_possible_cpu(i)
114 if (cbe_thread_map[i].cpu_node == cpu)
115 cbe_thread_map[i].regs = map;
117 prop = get_property(cpu, "pervasive", NULL);
119 map->pmd_regs = ioremap(prop->address, prop->len);
121 prop = get_property(cpu, "iic", NULL);
123 map->iic_regs = ioremap(prop->address, prop->len);