linux/arch/powerpc/platforms/cell/cbe_regs.c
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   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/export.h>
  12#include <linux/of_device.h>
  13#include <linux/of_platform.h>
  14
  15#include <asm/io.h>
  16#include <asm/pgtable.h>
  17#include <asm/prom.h>
  18#include <asm/ptrace.h>
  19#include <asm/cell-regs.h>
  20
  21/*
  22 * Current implementation uses "cpu" nodes. We build our own mapping
  23 * array of cpu numbers to cpu nodes locally for now to allow interrupt
  24 * time code to have a fast path rather than call of_get_cpu_node(). If
  25 * we implement cpu hotplug, we'll have to install an appropriate norifier
  26 * in order to release references to the cpu going away
  27 */
  28static struct cbe_regs_map
  29{
  30        struct device_node *cpu_node;
  31        struct device_node *be_node;
  32        struct cbe_pmd_regs __iomem *pmd_regs;
  33        struct cbe_iic_regs __iomem *iic_regs;
  34        struct cbe_mic_tm_regs __iomem *mic_tm_regs;
  35        struct cbe_pmd_shadow_regs pmd_shadow_regs;
  36} cbe_regs_maps[MAX_CBE];
  37static int cbe_regs_map_count;
  38
  39static struct cbe_thread_map
  40{
  41        struct device_node *cpu_node;
  42        struct device_node *be_node;
  43        struct cbe_regs_map *regs;
  44        unsigned int thread_id;
  45        unsigned int cbe_id;
  46} cbe_thread_map[NR_CPUS];
  47
  48static cpumask_t cbe_local_mask[MAX_CBE] = { [0 ... MAX_CBE-1] = {CPU_BITS_NONE} };
  49static cpumask_t cbe_first_online_cpu = { CPU_BITS_NONE };
  50
  51static struct cbe_regs_map *cbe_find_map(struct device_node *np)
  52{
  53        int i;
  54        struct device_node *tmp_np;
  55
  56        if (strcasecmp(np->type, "spe")) {
  57                for (i = 0; i < cbe_regs_map_count; i++)
  58                        if (cbe_regs_maps[i].cpu_node == np ||
  59                            cbe_regs_maps[i].be_node == np)
  60                                return &cbe_regs_maps[i];
  61                return NULL;
  62        }
  63
  64        if (np->data)
  65                return np->data;
  66
  67        /* walk up path until cpu or be node was found */
  68        tmp_np = np;
  69        do {
  70                tmp_np = tmp_np->parent;
  71                /* on a correct devicetree we wont get up to root */
  72                BUG_ON(!tmp_np);
  73        } while (strcasecmp(tmp_np->type, "cpu") &&
  74                 strcasecmp(tmp_np->type, "be"));
  75
  76        np->data = cbe_find_map(tmp_np);
  77
  78        return np->data;
  79}
  80
  81struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
  82{
  83        struct cbe_regs_map *map = cbe_find_map(np);
  84        if (map == NULL)
  85                return NULL;
  86        return map->pmd_regs;
  87}
  88EXPORT_SYMBOL_GPL(cbe_get_pmd_regs);
  89
  90struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu)
  91{
  92        struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
  93        if (map == NULL)
  94                return NULL;
  95        return map->pmd_regs;
  96}
  97EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs);
  98
  99struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np)
 100{
 101        struct cbe_regs_map *map = cbe_find_map(np);
 102        if (map == NULL)
 103                return NULL;
 104        return &map->pmd_shadow_regs;
 105}
 106
 107struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu)
 108{
 109        struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
 110        if (map == NULL)
 111                return NULL;
 112        return &map->pmd_shadow_regs;
 113}
 114
 115struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np)
 116{
 117        struct cbe_regs_map *map = cbe_find_map(np);
 118        if (map == NULL)
 119                return NULL;
 120        return map->iic_regs;
 121}
 122
 123struct cbe_iic_regs __iomem *cbe_get_cpu_iic_regs(int cpu)
 124{
 125        struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
 126        if (map == NULL)
 127                return NULL;
 128        return map->iic_regs;
 129}
 130
 131struct cbe_mic_tm_regs __iomem *cbe_get_mic_tm_regs(struct device_node *np)
 132{
 133        struct cbe_regs_map *map = cbe_find_map(np);
 134        if (map == NULL)
 135                return NULL;
 136        return map->mic_tm_regs;
 137}
 138
 139struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu)
 140{
 141        struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
 142        if (map == NULL)
 143                return NULL;
 144        return map->mic_tm_regs;
 145}
 146EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
 147
 148u32 cbe_get_hw_thread_id(int cpu)
 149{
 150        return cbe_thread_map[cpu].thread_id;
 151}
 152EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
 153
 154u32 cbe_cpu_to_node(int cpu)
 155{
 156        return cbe_thread_map[cpu].cbe_id;
 157}
 158EXPORT_SYMBOL_GPL(cbe_cpu_to_node);
 159
 160u32 cbe_node_to_cpu(int node)
 161{
 162        return cpumask_first(&cbe_local_mask[node]);
 163
 164}
 165EXPORT_SYMBOL_GPL(cbe_node_to_cpu);
 166
 167static struct device_node *cbe_get_be_node(int cpu_id)
 168{
 169        struct device_node *np;
 170
 171        for_each_node_by_type (np, "be") {
 172                int len,i;
 173                const phandle *cpu_handle;
 174
 175                cpu_handle = of_get_property(np, "cpus", &len);
 176
 177                /*
 178                 * the CAB SLOF tree is non compliant, so we just assume
 179                 * there is only one node
 180                 */
 181                if (WARN_ON_ONCE(!cpu_handle))
 182                        return np;
 183
 184                for (i=0; i<len; i++)
 185                        if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL))
 186                                return np;
 187        }
 188
 189        return NULL;
 190}
 191
 192static void __init cbe_fill_regs_map(struct cbe_regs_map *map)
 193{
 194        if(map->be_node) {
 195                struct device_node *be, *np;
 196
 197                be = map->be_node;
 198
 199                for_each_node_by_type(np, "pervasive")
 200                        if (of_get_parent(np) == be)
 201                                map->pmd_regs = of_iomap(np, 0);
 202
 203                for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller")
 204                        if (of_get_parent(np) == be)
 205                                map->iic_regs = of_iomap(np, 2);
 206
 207                for_each_node_by_type(np, "mic-tm")
 208                        if (of_get_parent(np) == be)
 209                                map->mic_tm_regs = of_iomap(np, 0);
 210        } else {
 211                struct device_node *cpu;
 212                /* That hack must die die die ! */
 213                const struct address_prop {
 214                        unsigned long address;
 215                        unsigned int len;
 216                } __attribute__((packed)) *prop;
 217
 218                cpu = map->cpu_node;
 219
 220                prop = of_get_property(cpu, "pervasive", NULL);
 221                if (prop != NULL)
 222                        map->pmd_regs = ioremap(prop->address, prop->len);
 223
 224                prop = of_get_property(cpu, "iic", NULL);
 225                if (prop != NULL)
 226                        map->iic_regs = ioremap(prop->address, prop->len);
 227
 228                prop = of_get_property(cpu, "mic-tm", NULL);
 229                if (prop != NULL)
 230                        map->mic_tm_regs = ioremap(prop->address, prop->len);
 231        }
 232}
 233
 234
 235void __init cbe_regs_init(void)
 236{
 237        int i;
 238        unsigned int thread_id;
 239        struct device_node *cpu;
 240
 241        /* Build local fast map of CPUs */
 242        for_each_possible_cpu(i) {
 243                cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
 244                cbe_thread_map[i].be_node = cbe_get_be_node(i);
 245                cbe_thread_map[i].thread_id = thread_id;
 246        }
 247
 248        /* Find maps for each device tree CPU */
 249        for_each_node_by_type(cpu, "cpu") {
 250                struct cbe_regs_map *map;
 251                unsigned int cbe_id;
 252
 253                cbe_id = cbe_regs_map_count++;
 254                map = &cbe_regs_maps[cbe_id];
 255
 256                if (cbe_regs_map_count > MAX_CBE) {
 257                        printk(KERN_ERR "cbe_regs: More BE chips than supported"
 258                               "!\n");
 259                        cbe_regs_map_count--;
 260                        of_node_put(cpu);
 261                        return;
 262                }
 263                map->cpu_node = cpu;
 264
 265                for_each_possible_cpu(i) {
 266                        struct cbe_thread_map *thread = &cbe_thread_map[i];
 267
 268                        if (thread->cpu_node == cpu) {
 269                                thread->regs = map;
 270                                thread->cbe_id = cbe_id;
 271                                map->be_node = thread->be_node;
 272                                cpumask_set_cpu(i, &cbe_local_mask[cbe_id]);
 273                                if(thread->thread_id == 0)
 274                                        cpumask_set_cpu(i, &cbe_first_online_cpu);
 275                        }
 276                }
 277
 278                cbe_fill_regs_map(map);
 279        }
 280}
 281
 282