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_device.h>
14#include <linux/of_platform.h>
15#include <linux/pgtable.h>
16
17#include <asm/io.h>
18#include <asm/prom.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 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_BITS_NONE} };
50static cpumask_t cbe_first_online_cpu = { CPU_BITS_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 (!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
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 cpumask_first(&cbe_local_mask[node]);
164
165}
166EXPORT_SYMBOL_GPL(cbe_node_to_cpu);
167
168static struct device_node *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			if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL))
187				return np;
188	}
189
190	return NULL;
191}
192
193static void __init cbe_fill_regs_map(struct cbe_regs_map *map)
194{
195	if(map->be_node) {
196		struct device_node *be, *np;
197
198		be = map->be_node;
199
200		for_each_node_by_type(np, "pervasive")
201			if (of_get_parent(np) == be)
202				map->pmd_regs = of_iomap(np, 0);
203
204		for_each_node_by_type(np, "CBEA-Internal-Interrupt-Controller")
205			if (of_get_parent(np) == be)
206				map->iic_regs = of_iomap(np, 2);
207
208		for_each_node_by_type(np, "mic-tm")
209			if (of_get_parent(np) == be)
210				map->mic_tm_regs = of_iomap(np, 0);
211	} else {
212		struct device_node *cpu;
213		/* That hack must die die die ! */
214		const struct address_prop {
215			unsigned long address;
216			unsigned int len;
217		} __attribute__((packed)) *prop;
218
219		cpu = map->cpu_node;
220
221		prop = of_get_property(cpu, "pervasive", NULL);
222		if (prop != NULL)
223			map->pmd_regs = ioremap(prop->address, prop->len);
224
225		prop = of_get_property(cpu, "iic", NULL);
226		if (prop != NULL)
227			map->iic_regs = ioremap(prop->address, prop->len);
228
229		prop = of_get_property(cpu, "mic-tm", NULL);
230		if (prop != NULL)
231			map->mic_tm_regs = ioremap(prop->address, prop->len);
232	}
233}
234
235
236void __init cbe_regs_init(void)
237{
238	int i;
239	unsigned int thread_id;
240	struct device_node *cpu;
241
242	/* Build local fast map of CPUs */
243	for_each_possible_cpu(i) {
244		cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
245		cbe_thread_map[i].be_node = cbe_get_be_node(i);
246		cbe_thread_map[i].thread_id = thread_id;
247	}
248
249	/* Find maps for each device tree CPU */
250	for_each_node_by_type(cpu, "cpu") {
251		struct cbe_regs_map *map;
252		unsigned int cbe_id;
253
254		cbe_id = cbe_regs_map_count++;
255		map = &cbe_regs_maps[cbe_id];
256
257		if (cbe_regs_map_count > MAX_CBE) {
258			printk(KERN_ERR "cbe_regs: More BE chips than supported"
259			       "!\n");
260			cbe_regs_map_count--;
261			of_node_put(cpu);
262			return;
263		}
264		map->cpu_node = cpu;
265
266		for_each_possible_cpu(i) {
267			struct cbe_thread_map *thread = &cbe_thread_map[i];
268
269			if (thread->cpu_node == cpu) {
270				thread->regs = map;
271				thread->cbe_id = cbe_id;
272				map->be_node = thread->be_node;
273				cpumask_set_cpu(i, &cbe_local_mask[cbe_id]);
274				if(thread->thread_id == 0)
275					cpumask_set_cpu(i, &cbe_first_online_cpu);
276			}
277		}
278
279		cbe_fill_regs_map(map);
280	}
281}
282
283