arch/powerpc/platforms/cell/cbe_regs.c

   1 /*
   2  * cbe_regs.c
   3  *
   4  * Accessor routines for the various MMIO register blocks of the CBE
   5  *
   6  * (c) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
   7  */
   8
   9 #include <linux/percpu.h>
  10 #include <linux/types.h>
  11 #include <linux/module.h>
  12
  13 #include <asm/io.h>
  14 #include <asm/pgtable.h>
  15 #include <asm/prom.h>
  16 #include <asm/ptrace.h>
  17
  18 #include "cbe_regs.h"
  19
  20 /*
  21  * Current implementation uses "cpu" nodes. We build our own mapping
  22  * array of cpu numbers to cpu nodes locally for now to allow interrupt
  23  * time code to have a fast path rather than call of_get_cpu_node(). If
  24  * we implement cpu hotplug, we'll have to install an appropriate norifier
  25  * in order to release references to the cpu going away
  26  */
  27 static struct cbe_regs_map
  28 {
  29         struct device_node *cpu_node;
  30         struct cbe_pmd_regs __iomem *pmd_regs;
  31         struct cbe_iic_regs __iomem *iic_regs;
  32         struct cbe_mic_tm_regs __iomem *mic_tm_regs;
  33         struct cbe_pmd_shadow_regs pmd_shadow_regs;
  34 } cbe_regs_maps[MAX_CBE];
  35 static int cbe_regs_map_count;
  36
  37 static struct cbe_thread_map
  38 {
  39         struct device_node *cpu_node;
  40         struct cbe_regs_map *regs;
  41 } cbe_thread_map[NR_CPUS];
  42
  43 static struct cbe_regs_map *cbe_find_map(struct device_node *np)
  44 {
  45         int i;
  46         struct device_node *tmp_np;
  47
  48         if (strcasecmp(np->type, "spe") == 0) {
  49                 if (np->data == NULL) {
  50                         /* walk up path until cpu node was found */
  51                         tmp_np = np->parent;
  52                         while (tmp_np != NULL && strcasecmp(tmp_np->type, "cpu") != 0)
  53                                 tmp_np = tmp_np->parent;
  54
  55                         np->data = cbe_find_map(tmp_np);
  56                 }
  57                 return np->data;
  58         }
  59
  60         for (i = 0; i < cbe_regs_map_count; i++)
  61                 if (cbe_regs_maps[i].cpu_node == np)
  62                         return &cbe_regs_maps[i];
  63         return NULL;
  64 }
  65
  66 struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
  67 {
  68         struct cbe_regs_map *map = cbe_find_map(np);
  69         if (map == NULL)
  70                 return NULL;
  71         return map->pmd_regs;
  72 }
  73 EXPORT_SYMBOL_GPL(cbe_get_pmd_regs);
  74
  75 struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu)
  76 {
  77         struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
  78         if (map == NULL)
  79                 return NULL;
  80         return map->pmd_regs;
  81 }
  82 EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs);
  83
  84 struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np)
  85 {
  86         struct cbe_regs_map *map = cbe_find_map(np);
  87         if (map == NULL)
  88                 return NULL;
  89         return &map->pmd_shadow_regs;
  90 }
  91
  92 struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu)
  93 {
  94         struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
  95         if (map == NULL)
  96                 return NULL;
  97         return &map->pmd_shadow_regs;
  98 }
  99
 100 struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np)
 101 {
 102         struct cbe_regs_map *map = cbe_find_map(np);
 103         if (map == NULL)
 104                 return NULL;
 105         return map->iic_regs;
 106 }
 107
 108 struct cbe_iic_regs __iomem *cbe_get_cpu_iic_regs(int cpu)
 109 {
 110         struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
 111         if (map == NULL)
 112                 return NULL;
 113         return map->iic_regs;
 114 }
 115
 116 struct cbe_mic_tm_regs __iomem *cbe_get_mic_tm_regs(struct device_node *np)
 117 {
 118         struct cbe_regs_map *map = cbe_find_map(np);
 119         if (map == NULL)
 120                 return NULL;
 121         return map->mic_tm_regs;
 122 }
 123
 124 struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu)
 125 {
 126         struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
 127         if (map == NULL)
 128                 return NULL;
 129         return map->mic_tm_regs;
 130 }
 131 EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
 132
 133 /* FIXME
 134  * This is little more than a stub at the moment.  It should be
 135  * fleshed out so that it works for both SMT and non-SMT, no
 136  * matter if the passed cpu is odd or even.
 137  * For SMT enabled, returns 0 for even-numbered cpu; otherwise 1.
 138  * For SMT disabled, returns 0 for all cpus.
 139  */
 140 u32 cbe_get_hw_thread_id(int cpu)
 141 {
 142         return (cpu & 1);
 143 }
 144 EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
 145
 146 void __init cbe_regs_init(void)
 147 {
 148         int i;
 149         struct device_node *cpu;
 150
 151         /* Build local fast map of CPUs */
 152         for_each_possible_cpu(i)
 153                 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, NULL);
 154
 155         /* Find maps for each device tree CPU */
 156         for_each_node_by_type(cpu, "cpu") {
 157                 struct cbe_regs_map *map = &cbe_regs_maps[cbe_regs_map_count++];
 158
 159                 /* That hack must die die die ! */
 160                 const struct address_prop {
 161                         unsigned long address;
 162                         unsigned int len;
 163                 } __attribute__((packed)) *prop;
 164
 165
 166                 if (cbe_regs_map_count > MAX_CBE) {
 167                         printk(KERN_ERR "cbe_regs: More BE chips than supported"
 168                                "!\n");
 169                         cbe_regs_map_count--;
 170                         return;
 171                 }
 172                 map->cpu_node = cpu;
 173                 for_each_possible_cpu(i)
 174                         if (cbe_thread_map[i].cpu_node == cpu)
 175                                 cbe_thread_map[i].regs = map;
 176
 177                 prop = get_property(cpu, "pervasive", NULL);
 178                 if (prop != NULL)
 179                         map->pmd_regs = ioremap(prop->address, prop->len);
 180
 181                 prop = get_property(cpu, "iic", NULL);
 182                 if (prop != NULL)
 183                         map->iic_regs = ioremap(prop->address, prop->len);
 184
 185                 prop = (struct address_prop *)get_property(cpu, "mic-tm",
 186                                                            NULL);
 187                 if (prop != NULL)
 188                         map->mic_tm_regs = ioremap(prop->address, prop->len);
 189         }
 190 }
 191