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#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_MASK_NONE }; 49static cpumask_t cbe_first_online_cpu = CPU_MASK_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 find_first_bit( (unsigned long *) &cbe_local_mask[node], sizeof(cpumask_t)); 163} 164EXPORT_SYMBOL_GPL(cbe_node_to_cpu); 165 166static struct device_node *cbe_get_be_node(int cpu_id) 167{ 168 struct device_node *np; 169 170 for_each_node_by_type (np, "be") { 171 int len,i; 172 const phandle *cpu_handle; 173 174 cpu_handle = of_get_property(np, "cpus", &len); 175 176 /* 177 * the CAB SLOF tree is non compliant, so we just assume 178 * there is only one node 179 */ 180 if (WARN_ON_ONCE(!cpu_handle)) 181 return np; 182 183 for (i=0; i<len; i++) 184 if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL)) 185 return np; 186 } 187 188 return NULL; 189} 190 191void __init cbe_fill_regs_map(struct cbe_regs_map *map) 192{ 193 if(map->be_node) { 194 struct device_node *be, *np; 195 196 be = map->be_node; 197 198 for_each_node_by_type(np, "pervasive") 199 if (of_get_parent(np) == be) 200 map->pmd_regs = of_iomap(np, 0); 201 202 for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller") 203 if (of_get_parent(np) == be) 204 map->iic_regs = of_iomap(np, 2); 205 206 for_each_node_by_type(np, "mic-tm") 207 if (of_get_parent(np) == be) 208 map->mic_tm_regs = of_iomap(np, 0); 209 } else { 210 struct device_node *cpu; 211 /* That hack must die die die ! */ 212 const struct address_prop { 213 unsigned long address; 214 unsigned int len; 215 } __attribute__((packed)) *prop; 216 217 cpu = map->cpu_node; 218 219 prop = of_get_property(cpu, "pervasive", NULL); 220 if (prop != NULL) 221 map->pmd_regs = ioremap(prop->address, prop->len); 222 223 prop = of_get_property(cpu, "iic", NULL); 224 if (prop != NULL) 225 map->iic_regs = ioremap(prop->address, prop->len); 226 227 prop = of_get_property(cpu, "mic-tm", NULL); 228 if (prop != NULL) 229 map->mic_tm_regs = ioremap(prop->address, prop->len); 230 } 231} 232 233 234void __init cbe_regs_init(void) 235{ 236 int i; 237 unsigned int thread_id; 238 struct device_node *cpu; 239 240 /* Build local fast map of CPUs */ 241 for_each_possible_cpu(i) { 242 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id); 243 cbe_thread_map[i].be_node = cbe_get_be_node(i); 244 cbe_thread_map[i].thread_id = thread_id; 245 } 246 247 /* Find maps for each device tree CPU */ 248 for_each_node_by_type(cpu, "cpu") { 249 struct cbe_regs_map *map; 250 unsigned int cbe_id; 251 252 cbe_id = cbe_regs_map_count++; 253 map = &cbe_regs_maps[cbe_id]; 254 255 if (cbe_regs_map_count > MAX_CBE) { 256 printk(KERN_ERR "cbe_regs: More BE chips than supported" 257 "!\n"); 258 cbe_regs_map_count--; 259 of_node_put(cpu); 260 return; 261 } 262 map->cpu_node = cpu; 263 264 for_each_possible_cpu(i) { 265 struct cbe_thread_map *thread = &cbe_thread_map[i]; 266 267 if (thread->cpu_node == cpu) { 268 thread->regs = map; 269 thread->cbe_id = cbe_id; 270 map->be_node = thread->be_node; 271 cpu_set(i, cbe_local_mask[cbe_id]); 272 if(thread->thread_id == 0) 273 cpu_set(i, cbe_first_online_cpu); 274 } 275 } 276 277 cbe_fill_regs_map(map); 278 } 279} 280