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 13#include <asm/io.h> 14#include <asm/pgtable.h> 15#include <asm/prom.h> 16#include <asm/ptrace.h> 17#include <asm/of_device.h> 18#include <asm/of_platform.h> 19 20#include "cbe_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 */ 29static 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]; 38static int cbe_regs_map_count; 39 40static 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 49static cpumask_t cbe_local_mask[MAX_CBE] = { [0 ... MAX_CBE-1] = CPU_MASK_NONE }; 50static cpumask_t cbe_first_online_cpu = CPU_MASK_NONE; 51 52static struct cbe_regs_map *cbe_find_map(struct device_node *np) 53{ 54 int i; 55 struct device_node *tmp_np; 56 57 if (strcasecmp(np->type, "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 (strcasecmp(tmp_np->type, "cpu") && 75 strcasecmp(tmp_np->type, "be")); 76 77 np->data = cbe_find_map(tmp_np); 78 79 return np->data; 80} 81 82struct 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} 89EXPORT_SYMBOL_GPL(cbe_get_pmd_regs); 90 91struct 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} 98EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs); 99 100struct 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 108struct 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 116struct 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 124struct 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 132struct 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 140struct 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} 147EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs); 148 149u32 cbe_get_hw_thread_id(int cpu) 150{ 151 return cbe_thread_map[cpu].thread_id; 152} 153EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id); 154 155u32 cbe_cpu_to_node(int cpu) 156{ 157 return cbe_thread_map[cpu].cbe_id; 158} 159EXPORT_SYMBOL_GPL(cbe_cpu_to_node); 160 161u32 cbe_node_to_cpu(int node) 162{ 163 return find_first_bit( (unsigned long *) &cbe_local_mask[node], sizeof(cpumask_t)); 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 for (i=0; i<len; i++) 178 if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL)) 179 return np; 180 } 181 182 return NULL; 183} 184 185void __init cbe_fill_regs_map(struct cbe_regs_map *map) 186{ 187 if(map->be_node) { 188 struct device_node *be, *np; 189 190 be = map->be_node; 191 192 for_each_node_by_type(np, "pervasive") 193 if (of_get_parent(np) == be) 194 map->pmd_regs = of_iomap(np, 0); 195 196 for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller") 197 if (of_get_parent(np) == be) 198 map->iic_regs = of_iomap(np, 2); 199 200 for_each_node_by_type(np, "mic-tm") 201 if (of_get_parent(np) == be) 202 map->mic_tm_regs = of_iomap(np, 0); 203 } else { 204 struct device_node *cpu; 205 /* That hack must die die die ! */ 206 const struct address_prop { 207 unsigned long address; 208 unsigned int len; 209 } __attribute__((packed)) *prop; 210 211 cpu = map->cpu_node; 212 213 prop = of_get_property(cpu, "pervasive", NULL); 214 if (prop != NULL) 215 map->pmd_regs = ioremap(prop->address, prop->len); 216 217 prop = of_get_property(cpu, "iic", NULL); 218 if (prop != NULL) 219 map->iic_regs = ioremap(prop->address, prop->len); 220 221 prop = of_get_property(cpu, "mic-tm", NULL); 222 if (prop != NULL) 223 map->mic_tm_regs = ioremap(prop->address, prop->len); 224 } 225} 226 227 228void __init cbe_regs_init(void) 229{ 230 int i; 231 unsigned int thread_id; 232 struct device_node *cpu; 233 234 /* Build local fast map of CPUs */ 235 for_each_possible_cpu(i) { 236 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id); 237 cbe_thread_map[i].be_node = cbe_get_be_node(i); 238 cbe_thread_map[i].thread_id = thread_id; 239 } 240 241 /* Find maps for each device tree CPU */ 242 for_each_node_by_type(cpu, "cpu") { 243 struct cbe_regs_map *map; 244 unsigned int cbe_id; 245 246 cbe_id = cbe_regs_map_count++; 247 map = &cbe_regs_maps[cbe_id]; 248 249 if (cbe_regs_map_count > MAX_CBE) { 250 printk(KERN_ERR "cbe_regs: More BE chips than supported" 251 "!\n"); 252 cbe_regs_map_count--; 253 return; 254 } 255 map->cpu_node = cpu; 256 257 for_each_possible_cpu(i) { 258 struct cbe_thread_map *thread = &cbe_thread_map[i]; 259 260 if (thread->cpu_node == cpu) { 261 thread->regs = map; 262 thread->cbe_id = cbe_id; 263 map->be_node = thread->be_node; 264 cpu_set(i, cbe_local_mask[cbe_id]); 265 if(thread->thread_id == 0) 266 cpu_set(i, cbe_first_online_cpu); 267 } 268 } 269 270 cbe_fill_regs_map(map); 271 } 272} 273