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_address.h>
14 #include <linux/of_device.h>
15 #include <linux/of_platform.h>
16 #include <linux/pgtable.h>
17
18 #include <asm/io.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 notifier
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
cbe_find_map(struct device_node * np)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
cbe_get_pmd_regs(struct device_node * np)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
cbe_get_cpu_pmd_regs(int cpu)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
cbe_get_pmd_shadow_regs(struct device_node * np)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
cbe_get_cpu_pmd_shadow_regs(int cpu)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
cbe_get_iic_regs(struct device_node * np)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
cbe_get_cpu_iic_regs(int cpu)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
cbe_get_mic_tm_regs(struct device_node * np)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
cbe_get_cpu_mic_tm_regs(int cpu)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
cbe_get_hw_thread_id(int cpu)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
cbe_cpu_to_node(int cpu)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
cbe_node_to_cpu(int node)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
cbe_get_be_node(int cpu_id)168 static struct device_node *__init 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 struct device_node *ch_np = of_find_node_by_phandle(cpu_handle[i]);
187 struct device_node *ci_np = of_get_cpu_node(cpu_id, NULL);
188
189 of_node_put(ch_np);
190 of_node_put(ci_np);
191
192 if (ch_np == ci_np)
193 return np;
194 }
195 }
196
197 return NULL;
198 }
199
cbe_fill_regs_map(struct cbe_regs_map * map)200 static void __init cbe_fill_regs_map(struct cbe_regs_map *map)
201 {
202 if(map->be_node) {
203 struct device_node *be, *np, *parent_np;
204
205 be = map->be_node;
206
207 for_each_node_by_type(np, "pervasive") {
208 parent_np = of_get_parent(np);
209 if (parent_np == be)
210 map->pmd_regs = of_iomap(np, 0);
211 of_node_put(parent_np);
212 }
213
214 for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller") {
215 parent_np = of_get_parent(np);
216 if (parent_np == be)
217 map->iic_regs = of_iomap(np, 2);
218 of_node_put(parent_np);
219 }
220
221 for_each_node_by_type(np, "mic-tm") {
222 parent_np = of_get_parent(np);
223 if (parent_np == be)
224 map->mic_tm_regs = of_iomap(np, 0);
225 of_node_put(parent_np);
226 }
227 } else {
228 struct device_node *cpu;
229 /* That hack must die die die ! */
230 const struct address_prop {
231 unsigned long address;
232 unsigned int len;
233 } __attribute__((packed)) *prop;
234
235 cpu = map->cpu_node;
236
237 prop = of_get_property(cpu, "pervasive", NULL);
238 if (prop != NULL)
239 map->pmd_regs = ioremap(prop->address, prop->len);
240
241 prop = of_get_property(cpu, "iic", NULL);
242 if (prop != NULL)
243 map->iic_regs = ioremap(prop->address, prop->len);
244
245 prop = of_get_property(cpu, "mic-tm", NULL);
246 if (prop != NULL)
247 map->mic_tm_regs = ioremap(prop->address, prop->len);
248 }
249 }
250
251
cbe_regs_init(void)252 void __init cbe_regs_init(void)
253 {
254 int i;
255 unsigned int thread_id;
256 struct device_node *cpu;
257
258 /* Build local fast map of CPUs */
259 for_each_possible_cpu(i) {
260 cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
261 cbe_thread_map[i].be_node = cbe_get_be_node(i);
262 cbe_thread_map[i].thread_id = thread_id;
263 }
264
265 /* Find maps for each device tree CPU */
266 for_each_node_by_type(cpu, "cpu") {
267 struct cbe_regs_map *map;
268 unsigned int cbe_id;
269
270 cbe_id = cbe_regs_map_count++;
271 map = &cbe_regs_maps[cbe_id];
272
273 if (cbe_regs_map_count > MAX_CBE) {
274 printk(KERN_ERR "cbe_regs: More BE chips than supported"
275 "!\n");
276 cbe_regs_map_count--;
277 of_node_put(cpu);
278 return;
279 }
280 of_node_put(map->cpu_node);
281 map->cpu_node = of_node_get(cpu);
282
283 for_each_possible_cpu(i) {
284 struct cbe_thread_map *thread = &cbe_thread_map[i];
285
286 if (thread->cpu_node == cpu) {
287 thread->regs = map;
288 thread->cbe_id = cbe_id;
289 map->be_node = thread->be_node;
290 cpumask_set_cpu(i, &cbe_local_mask[cbe_id]);
291 if(thread->thread_id == 0)
292 cpumask_set_cpu(i, &cbe_first_online_cpu);
293 }
294 }
295
296 cbe_fill_regs_map(map);
297 }
298 }
299
300