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

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  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/export.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  */
 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 (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 
 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 *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                         if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL))
186                                 return np;
187         }
188 
189         return NULL;
190 }
191 
192 void __init cbe_fill_regs_map(struct cbe_regs_map *map)
193 {
194         if(map->be_node) {
195                 struct device_node *be, *np;
196 
197                 be = map->be_node;
198 
199                 for_each_node_by_type(np, "pervasive")
200                         if (of_get_parent(np) == be)
201                                 map->pmd_regs = of_iomap(np, 0);
202 
203                 for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller")
204                         if (of_get_parent(np) == be)
205                                 map->iic_regs = of_iomap(np, 2);
206 
207                 for_each_node_by_type(np, "mic-tm")
208                         if (of_get_parent(np) == be)
209                                 map->mic_tm_regs = of_iomap(np, 0);
210         } else {
211                 struct device_node *cpu;
212                 /* That hack must die die die ! */
213                 const struct address_prop {
214                         unsigned long address;
215                         unsigned int len;
216                 } __attribute__((packed)) *prop;
217 
218                 cpu = map->cpu_node;
219 
220                 prop = of_get_property(cpu, "pervasive", NULL);
221                 if (prop != NULL)
222                         map->pmd_regs = ioremap(prop->address, prop->len);
223 
224                 prop = of_get_property(cpu, "iic", NULL);
225                 if (prop != NULL)
226                         map->iic_regs = ioremap(prop->address, prop->len);
227 
228                 prop = of_get_property(cpu, "mic-tm", NULL);
229                 if (prop != NULL)
230                         map->mic_tm_regs = ioremap(prop->address, prop->len);
231         }
232 }
233 
234 
235 void __init cbe_regs_init(void)
236 {
237         int i;
238         unsigned int thread_id;
239         struct device_node *cpu;
240 
241         /* Build local fast map of CPUs */
242         for_each_possible_cpu(i) {
243                 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
244                 cbe_thread_map[i].be_node = cbe_get_be_node(i);
245                 cbe_thread_map[i].thread_id = thread_id;
246         }
247 
248         /* Find maps for each device tree CPU */
249         for_each_node_by_type(cpu, "cpu") {
250                 struct cbe_regs_map *map;
251                 unsigned int cbe_id;
252 
253                 cbe_id = cbe_regs_map_count++;
254                 map = &cbe_regs_maps[cbe_id];
255 
256                 if (cbe_regs_map_count > MAX_CBE) {
257                         printk(KERN_ERR "cbe_regs: More BE chips than supported"
258                                "!\n");
259                         cbe_regs_map_count--;
260                         of_node_put(cpu);
261                         return;
262                 }
263                 map->cpu_node = cpu;
264 
265                 for_each_possible_cpu(i) {
266                         struct cbe_thread_map *thread = &cbe_thread_map[i];
267 
268                         if (thread->cpu_node == cpu) {
269                                 thread->regs = map;
270                                 thread->cbe_id = cbe_id;
271                                 map->be_node = thread->be_node;
272                                 cpumask_set_cpu(i, &cbe_local_mask[cbe_id]);
273                                 if(thread->thread_id == 0)
274                                         cpumask_set_cpu(i, &cbe_first_online_cpu);
275                         }
276                 }
277 
278                 cbe_fill_regs_map(map);
279         }
280 }
281 
282 

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