root/arch/powerpc/platforms/cell/cbe_regs.c

DEFINITIONS

1. cbe_find_map
2. cbe_get_pmd_regs
3. cbe_get_cpu_pmd_regs
4. cbe_get_pmd_shadow_regs
5. cbe_get_cpu_pmd_shadow_regs
6. cbe_get_iic_regs
7. cbe_get_cpu_iic_regs
8. cbe_get_mic_tm_regs
9. cbe_get_cpu_mic_tm_regs
10. cbe_get_hw_thread_id
11. cbe_cpu_to_node
12. cbe_node_to_cpu
13. cbe_get_be_node
14. cbe_fill_regs_map
15. cbe_regs_init

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