1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
|
/*
* Copyright (c) 2013-2014 Linaro Ltd.
* Copyright (c) 2013-2014 Hisilicon Limited.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/of_address.h>
#include <asm/cputype.h>
#include <asm/cp15.h>
#include <asm/cacheflush.h>
#include <asm/smp.h>
#include <asm/smp_plat.h>
#include "core.h"
/* bits definition in SC_CPU_RESET_REQ[x]/SC_CPU_RESET_DREQ[x]
* 1 -- unreset; 0 -- reset
*/
#define CORE_RESET_BIT(x) (1 << x)
#define NEON_RESET_BIT(x) (1 << (x + 4))
#define CORE_DEBUG_RESET_BIT(x) (1 << (x + 9))
#define CLUSTER_L2_RESET_BIT (1 << 8)
#define CLUSTER_DEBUG_RESET_BIT (1 << 13)
/*
* bits definition in SC_CPU_RESET_STATUS[x]
* 1 -- reset status; 0 -- unreset status
*/
#define CORE_RESET_STATUS(x) (1 << x)
#define NEON_RESET_STATUS(x) (1 << (x + 4))
#define CORE_DEBUG_RESET_STATUS(x) (1 << (x + 9))
#define CLUSTER_L2_RESET_STATUS (1 << 8)
#define CLUSTER_DEBUG_RESET_STATUS (1 << 13)
#define CORE_WFI_STATUS(x) (1 << (x + 16))
#define CORE_WFE_STATUS(x) (1 << (x + 20))
#define CORE_DEBUG_ACK(x) (1 << (x + 24))
#define SC_CPU_RESET_REQ(x) (0x520 + (x << 3)) /* reset */
#define SC_CPU_RESET_DREQ(x) (0x524 + (x << 3)) /* unreset */
#define SC_CPU_RESET_STATUS(x) (0x1520 + (x << 3))
#define FAB_SF_MODE 0x0c
#define FAB_SF_INVLD 0x10
/* bits definition in FB_SF_INVLD */
#define FB_SF_INVLD_START (1 << 8)
#define HIP04_MAX_CLUSTERS 4
#define HIP04_MAX_CPUS_PER_CLUSTER 4
#define POLL_MSEC 10
#define TIMEOUT_MSEC 1000
static void __iomem *sysctrl, *fabric;
static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER];
static DEFINE_SPINLOCK(boot_lock);
static u32 fabric_phys_addr;
/*
* [0]: bootwrapper physical address
* [1]: bootwrapper size
* [2]: relocation address
* [3]: relocation size
*/
static u32 hip04_boot_method[4];
static bool hip04_cluster_is_down(unsigned int cluster)
{
int i;
for (i = 0; i < HIP04_MAX_CPUS_PER_CLUSTER; i++)
if (hip04_cpu_table[cluster][i])
return false;
return true;
}
static void hip04_set_snoop_filter(unsigned int cluster, unsigned int on)
{
unsigned long data;
if (!fabric)
BUG();
data = readl_relaxed(fabric + FAB_SF_MODE);
if (on)
data |= 1 << cluster;
else
data &= ~(1 << cluster);
writel_relaxed(data, fabric + FAB_SF_MODE);
do {
cpu_relax();
} while (data != readl_relaxed(fabric + FAB_SF_MODE));
}
static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
{
unsigned int mpidr, cpu, cluster;
unsigned long data;
void __iomem *sys_dreq, *sys_status;
mpidr = cpu_logical_map(l_cpu);
cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
if (!sysctrl)
return -ENODEV;
if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER)
return -EINVAL;
spin_lock_irq(&boot_lock);
if (hip04_cpu_table[cluster][cpu])
goto out;
sys_dreq = sysctrl + SC_CPU_RESET_DREQ(cluster);
sys_status = sysctrl + SC_CPU_RESET_STATUS(cluster);
if (hip04_cluster_is_down(cluster)) {
data = CLUSTER_DEBUG_RESET_BIT;
writel_relaxed(data, sys_dreq);
do {
cpu_relax();
data = readl_relaxed(sys_status);
} while (data & CLUSTER_DEBUG_RESET_STATUS);
hip04_set_snoop_filter(cluster, 1);
}
data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
CORE_DEBUG_RESET_BIT(cpu);
writel_relaxed(data, sys_dreq);
do {
cpu_relax();
} while (data == readl_relaxed(sys_status));
/*
* We may fail to power up core again without this delay.
* It's not mentioned in document. It's found by test.
*/
udelay(20);
arch_send_wakeup_ipi_mask(cpumask_of(l_cpu));
out:
hip04_cpu_table[cluster][cpu]++;
spin_unlock_irq(&boot_lock);
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
static void hip04_cpu_die(unsigned int l_cpu)
{
unsigned int mpidr, cpu, cluster;
bool last_man;
mpidr = cpu_logical_map(l_cpu);
cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
spin_lock(&boot_lock);
hip04_cpu_table[cluster][cpu]--;
if (hip04_cpu_table[cluster][cpu] == 1) {
/* A power_up request went ahead of us. */
spin_unlock(&boot_lock);
return;
} else if (hip04_cpu_table[cluster][cpu] > 1) {
pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu);
BUG();
}
last_man = hip04_cluster_is_down(cluster);
spin_unlock(&boot_lock);
if (last_man) {
/* Since it's Cortex A15, disable L2 prefetching. */
asm volatile(
"mcr p15, 1, %0, c15, c0, 3 \n\t"
"isb \n\t"
"dsb "
: : "r" (0x400) );
v7_exit_coherency_flush(all);
} else {
v7_exit_coherency_flush(louis);
}
for (;;)
wfi();
}
static int hip04_cpu_kill(unsigned int l_cpu)
{
unsigned int mpidr, cpu, cluster;
unsigned int data, tries, count;
mpidr = cpu_logical_map(l_cpu);
cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
BUG_ON(cluster >= HIP04_MAX_CLUSTERS ||
cpu >= HIP04_MAX_CPUS_PER_CLUSTER);
count = TIMEOUT_MSEC / POLL_MSEC;
spin_lock_irq(&boot_lock);
for (tries = 0; tries < count; tries++) {
if (hip04_cpu_table[cluster][cpu])
goto err;
cpu_relax();
data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
if (data & CORE_WFI_STATUS(cpu))
break;
spin_unlock_irq(&boot_lock);
/* Wait for clean L2 when the whole cluster is down. */
msleep(POLL_MSEC);
spin_lock_irq(&boot_lock);
}
if (tries >= count)
goto err;
data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
CORE_DEBUG_RESET_BIT(cpu);
writel_relaxed(data, sysctrl + SC_CPU_RESET_REQ(cluster));
for (tries = 0; tries < count; tries++) {
cpu_relax();
data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
if (data & CORE_RESET_STATUS(cpu))
break;
}
if (tries >= count)
goto err;
if (hip04_cluster_is_down(cluster))
hip04_set_snoop_filter(cluster, 0);
spin_unlock_irq(&boot_lock);
return 1;
err:
spin_unlock_irq(&boot_lock);
return 0;
}
#endif
static struct smp_operations __initdata hip04_smp_ops = {
.smp_boot_secondary = hip04_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = hip04_cpu_die,
.cpu_kill = hip04_cpu_kill,
#endif
};
static bool __init hip04_cpu_table_init(void)
{
unsigned int mpidr, cpu, cluster;
mpidr = read_cpuid_mpidr();
cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
if (cluster >= HIP04_MAX_CLUSTERS ||
cpu >= HIP04_MAX_CPUS_PER_CLUSTER) {
pr_err("%s: boot CPU is out of bound!\n", __func__);
return false;
}
hip04_set_snoop_filter(cluster, 1);
hip04_cpu_table[cluster][cpu] = 1;
return true;
}
static int __init hip04_smp_init(void)
{
struct device_node *np, *np_sctl, *np_fab;
struct resource fab_res;
void __iomem *relocation;
int ret = -ENODEV;
np = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-bootwrapper");
if (!np)
goto err;
ret = of_property_read_u32_array(np, "boot-method",
&hip04_boot_method[0], 4);
if (ret)
goto err;
np_sctl = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
if (!np_sctl)
goto err;
np_fab = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-fabric");
if (!np_fab)
goto err;
ret = memblock_reserve(hip04_boot_method[0], hip04_boot_method[1]);
if (ret)
goto err;
relocation = ioremap(hip04_boot_method[2], hip04_boot_method[3]);
if (!relocation) {
pr_err("failed to map relocation space\n");
ret = -ENOMEM;
goto err_reloc;
}
sysctrl = of_iomap(np_sctl, 0);
if (!sysctrl) {
pr_err("failed to get sysctrl base\n");
ret = -ENOMEM;
goto err_sysctrl;
}
ret = of_address_to_resource(np_fab, 0, &fab_res);
if (ret) {
pr_err("failed to get fabric base phys\n");
goto err_fabric;
}
fabric_phys_addr = fab_res.start;
sync_cache_w(&fabric_phys_addr);
fabric = of_iomap(np_fab, 0);
if (!fabric) {
pr_err("failed to get fabric base\n");
ret = -ENOMEM;
goto err_fabric;
}
if (!hip04_cpu_table_init()) {
ret = -EINVAL;
goto err_table;
}
/*
* Fill the instruction address that is used after secondary core
* out of reset.
*/
writel_relaxed(hip04_boot_method[0], relocation);
writel_relaxed(0xa5a5a5a5, relocation + 4); /* magic number */
writel_relaxed(virt_to_phys(secondary_startup), relocation + 8);
writel_relaxed(0, relocation + 12);
iounmap(relocation);
smp_set_ops(&hip04_smp_ops);
return ret;
err_table:
iounmap(fabric);
err_fabric:
iounmap(sysctrl);
err_sysctrl:
iounmap(relocation);
err_reloc:
memblock_free(hip04_boot_method[0], hip04_boot_method[1]);
err:
return ret;
}
early_initcall(hip04_smp_init);
|
