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 } 298 299