arch/powerpc/platforms/cell/cbe_regs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * cbe_regs.c
   4  *
   5  * Accessor routines for the various MMIO register blocks of the CBE
   6  *
   7  * (c) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
   8  */
   9
  10 #include <linux/percpu.h>
  11 #include <linux/types.h>
  12 #include <linux/export.h>
  13 #include <linux/of.h>
  14 #include <linux/of_address.h>
  15 #include <linux/pgtable.h>
  16
  17 #include <asm/io.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 notifier
  26  * in order to release references to the cpu going away
  27  */
  28 static 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];
  37 static int cbe_regs_map_count;
  38
  39 static 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
  48 static cpumask_t cbe_local_mask[MAX_CBE] = { [0 ... MAX_CBE-1] = {CPU_BITS_NONE} };
  49 static cpumask_t cbe_first_online_cpu = { CPU_BITS_NONE };
  50
  51 static struct cbe_regs_map *cbe_find_map(struct device_node *np)
  52 {
  53         int i;
  54         struct device_node *tmp_np;
  55
  56         if (!of_node_is_type(np, "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 (!of_node_is_type(tmp_np, "cpu") ||
  74                  !of_node_is_type(tmp_np, "be"));
  75
  76         np->data = cbe_find_map(tmp_np);
  77
  78         return np->data;
  79 }
  80
  81 struct 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 }
  88 EXPORT_SYMBOL_GPL(cbe_get_pmd_regs);
  89
  90 struct 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 }
  97 EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs);
  98
  99 struct 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
 107 struct 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
 115 struct 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
 123 struct 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
 131 struct 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
 139 struct 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 }
 146 EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
 147
 148 u32 cbe_get_hw_thread_id(int cpu)
 149 {
 150         return cbe_thread_map[cpu].thread_id;
 151 }
 152 EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
 153
 154 u32 cbe_cpu_to_node(int cpu)
 155 {
 156         return cbe_thread_map[cpu].cbe_id;
 157 }
 158 EXPORT_SYMBOL_GPL(cbe_cpu_to_node);
 159
 160 u32 cbe_node_to_cpu(int node)
 161 {
 162         return cpumask_first(&cbe_local_mask[node]);
 163
 164 }
 165 EXPORT_SYMBOL_GPL(cbe_node_to_cpu);
 166
 167 static struct device_node *__init 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                         struct device_node *ch_np = of_find_node_by_phandle(cpu_handle[i]);
 186                         struct device_node *ci_np = of_get_cpu_node(cpu_id, NULL);
 187
 188                         of_node_put(ch_np);
 189                         of_node_put(ci_np);
 190
 191                         if (ch_np == ci_np)
 192                                 return np;
 193                 }
 194         }
 195
 196         return NULL;
 197 }
 198
 199 static void __init cbe_fill_regs_map(struct cbe_regs_map *map)
 200 {
 201         if(map->be_node) {
 202                 struct device_node *be, *np, *parent_np;
 203
 204                 be = map->be_node;
 205
 206                 for_each_node_by_type(np, "pervasive") {
 207                         parent_np = of_get_parent(np);
 208                         if (parent_np == be)
 209                                 map->pmd_regs = of_iomap(np, 0);
 210                         of_node_put(parent_np);
 211                 }
 212
 213                 for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller") {
 214                         parent_np = of_get_parent(np);
 215                         if (parent_np == be)
 216                                 map->iic_regs = of_iomap(np, 2);
 217                         of_node_put(parent_np);
 218                 }
 219
 220                 for_each_node_by_type(np, "mic-tm") {
 221                         parent_np = of_get_parent(np);
 222                         if (parent_np == be)
 223                                 map->mic_tm_regs = of_iomap(np, 0);
 224                         of_node_put(parent_np);
 225                 }
 226         } else {
 227                 struct device_node *cpu;
 228                 /* That hack must die die die ! */
 229                 const struct address_prop {
 230                         unsigned long address;
 231                         unsigned int len;
 232                 } __attribute__((packed)) *prop;
 233
 234                 cpu = map->cpu_node;
 235
 236                 prop = of_get_property(cpu, "pervasive", NULL);
 237                 if (prop != NULL)
 238                         map->pmd_regs = ioremap(prop->address, prop->len);
 239
 240                 prop = of_get_property(cpu, "iic", NULL);
 241                 if (prop != NULL)
 242                         map->iic_regs = ioremap(prop->address, prop->len);
 243
 244                 prop = of_get_property(cpu, "mic-tm", NULL);
 245                 if (prop != NULL)
 246                         map->mic_tm_regs = ioremap(prop->address, prop->len);
 247         }
 248 }
 249
 250
 251 void __init cbe_regs_init(void)
 252 {
 253         int i;
 254         unsigned int thread_id;
 255         struct device_node *cpu;
 256
 257         /* Build local fast map of CPUs */
 258         for_each_possible_cpu(i) {
 259                 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
 260                 cbe_thread_map[i].be_node = cbe_get_be_node(i);
 261                 cbe_thread_map[i].thread_id = thread_id;
 262         }
 263
 264         /* Find maps for each device tree CPU */
 265         for_each_node_by_type(cpu, "cpu") {
 266                 struct cbe_regs_map *map;
 267                 unsigned int cbe_id;
 268
 269                 cbe_id = cbe_regs_map_count++;
 270                 map = &cbe_regs_maps[cbe_id];
 271
 272                 if (cbe_regs_map_count > MAX_CBE) {
 273                         printk(KERN_ERR "cbe_regs: More BE chips than supported"
 274                                "!\n");
 275                         cbe_regs_map_count--;
 276                         of_node_put(cpu);
 277                         return;
 278                 }
 279                 of_node_put(map->cpu_node);
 280                 map->cpu_node = of_node_get(cpu);
 281
 282                 for_each_possible_cpu(i) {
 283                         struct cbe_thread_map *thread = &cbe_thread_map[i];
 284
 285                         if (thread->cpu_node == cpu) {
 286                                 thread->regs = map;
 287                                 thread->cbe_id = cbe_id;
 288                                 map->be_node = thread->be_node;
 289                                 cpumask_set_cpu(i, &cbe_local_mask[cbe_id]);
 290                                 if(thread->thread_id == 0)
 291                                         cpumask_set_cpu(i, &cbe_first_online_cpu);
 292                         }
 293                 }
 294
 295                 cbe_fill_regs_map(map);
 296         }
 297 }
 298