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CommitLineData
e14411da
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1/*
2 * Copyright (C) 2002 ARM Ltd.
3 * All Rights Reserved
4 * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
8fc1b0f8 5 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
e14411da
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6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/delay.h>
15#include <linux/device.h>
188611af
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16#include <linux/of.h>
17#include <linux/of_address.h>
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18#include <linux/smp.h>
19#include <linux/io.h>
916f743d 20#include <linux/qcom_scm.h>
e14411da 21
eb50439b 22#include <asm/smp_plat.h>
e14411da 23
e14411da 24
188611af
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25#define VDD_SC1_ARRAY_CLAMP_GFS_CTL 0x35a0
26#define SCSS_CPU1CORE_RESET 0x2d80
27#define SCSS_DBG_STATUS_CORE_PWRDUP 0x2e64
e14411da 28
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29#define APCS_CPU_PWR_CTL 0x04
30#define PLL_CLAMP BIT(8)
31#define CORE_PWRD_UP BIT(7)
32#define COREPOR_RST BIT(5)
33#define CORE_RST BIT(4)
34#define L2DT_SLP BIT(3)
35#define CLAMP BIT(0)
36
6990c132
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37#define APC_PWR_GATE_CTL 0x14
38#define BHS_CNT_SHIFT 24
39#define LDO_PWR_DWN_SHIFT 16
40#define LDO_BYP_SHIFT 8
41#define BHS_SEG_SHIFT 1
42#define BHS_EN BIT(0)
43
6267809f 44#define APCS_SAW2_VCTL 0x14
6990c132 45#define APCS_SAW2_2_VCTL 0x1c
6267809f 46
8684014d 47extern void secondary_startup_arm(void);
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48
49static DEFINE_SPINLOCK(boot_lock);
50
6a032dba 51#ifdef CONFIG_HOTPLUG_CPU
b96fc2f3 52static void qcom_cpu_die(unsigned int cpu)
6a032dba
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53{
54 wfi();
55}
56#endif
57
cf1e8f0c 58static void qcom_secondary_init(unsigned int cpu)
e14411da 59{
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60 /*
61 * Synchronise with the boot thread.
62 */
63 spin_lock(&boot_lock);
64 spin_unlock(&boot_lock);
65}
66
188611af 67static int scss_release_secondary(unsigned int cpu)
e14411da 68{
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69 struct device_node *node;
70 void __iomem *base;
71
72 node = of_find_compatible_node(NULL, NULL, "qcom,gcc-msm8660");
73 if (!node) {
74 pr_err("%s: can't find node\n", __func__);
75 return -ENXIO;
76 }
77
78 base = of_iomap(node, 0);
79 of_node_put(node);
80 if (!base)
81 return -ENOMEM;
82
83 writel_relaxed(0, base + VDD_SC1_ARRAY_CLAMP_GFS_CTL);
84 writel_relaxed(0, base + SCSS_CPU1CORE_RESET);
85 writel_relaxed(3, base + SCSS_DBG_STATUS_CORE_PWRDUP);
86 mb();
87 iounmap(base);
88
89 return 0;
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90}
91
6267809f
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92static int kpssv1_release_secondary(unsigned int cpu)
93{
94 int ret = 0;
95 void __iomem *reg, *saw_reg;
96 struct device_node *cpu_node, *acc_node, *saw_node;
97 u32 val;
98
99 cpu_node = of_get_cpu_node(cpu, NULL);
100 if (!cpu_node)
101 return -ENODEV;
102
103 acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
104 if (!acc_node) {
105 ret = -ENODEV;
106 goto out_acc;
107 }
108
109 saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
110 if (!saw_node) {
111 ret = -ENODEV;
112 goto out_saw;
113 }
114
115 reg = of_iomap(acc_node, 0);
116 if (!reg) {
117 ret = -ENOMEM;
118 goto out_acc_map;
119 }
120
121 saw_reg = of_iomap(saw_node, 0);
122 if (!saw_reg) {
123 ret = -ENOMEM;
124 goto out_saw_map;
125 }
126
127 /* Turn on CPU rail */
128 writel_relaxed(0xA4, saw_reg + APCS_SAW2_VCTL);
129 mb();
130 udelay(512);
131
132 /* Krait bring-up sequence */
133 val = PLL_CLAMP | L2DT_SLP | CLAMP;
134 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
135 val &= ~L2DT_SLP;
136 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
137 mb();
138 ndelay(300);
139
140 val |= COREPOR_RST;
141 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
142 mb();
143 udelay(2);
144
145 val &= ~CLAMP;
146 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
147 mb();
148 udelay(2);
149
150 val &= ~COREPOR_RST;
151 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
152 mb();
153 udelay(100);
154
155 val |= CORE_PWRD_UP;
156 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
157 mb();
158
159 iounmap(saw_reg);
160out_saw_map:
161 iounmap(reg);
162out_acc_map:
163 of_node_put(saw_node);
164out_saw:
165 of_node_put(acc_node);
166out_acc:
167 of_node_put(cpu_node);
168 return ret;
169}
170
6990c132
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171static int kpssv2_release_secondary(unsigned int cpu)
172{
173 void __iomem *reg;
174 struct device_node *cpu_node, *l2_node, *acc_node, *saw_node;
175 void __iomem *l2_saw_base;
176 unsigned reg_val;
177 int ret;
178
179 cpu_node = of_get_cpu_node(cpu, NULL);
180 if (!cpu_node)
181 return -ENODEV;
182
183 acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
184 if (!acc_node) {
185 ret = -ENODEV;
186 goto out_acc;
187 }
188
189 l2_node = of_parse_phandle(cpu_node, "next-level-cache", 0);
190 if (!l2_node) {
191 ret = -ENODEV;
192 goto out_l2;
193 }
194
195 saw_node = of_parse_phandle(l2_node, "qcom,saw", 0);
196 if (!saw_node) {
197 ret = -ENODEV;
198 goto out_saw;
199 }
200
201 reg = of_iomap(acc_node, 0);
202 if (!reg) {
203 ret = -ENOMEM;
204 goto out_map;
205 }
206
207 l2_saw_base = of_iomap(saw_node, 0);
208 if (!l2_saw_base) {
209 ret = -ENOMEM;
210 goto out_saw_map;
211 }
212
213 /* Turn on the BHS, turn off LDO Bypass and power down LDO */
214 reg_val = (64 << BHS_CNT_SHIFT) | (0x3f << LDO_PWR_DWN_SHIFT) | BHS_EN;
215 writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
216 mb();
217 /* wait for the BHS to settle */
218 udelay(1);
219
220 /* Turn on BHS segments */
221 reg_val |= 0x3f << BHS_SEG_SHIFT;
222 writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
223 mb();
224 /* wait for the BHS to settle */
225 udelay(1);
226
227 /* Finally turn on the bypass so that BHS supplies power */
228 reg_val |= 0x3f << LDO_BYP_SHIFT;
229 writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
230
231 /* enable max phases */
232 writel_relaxed(0x10003, l2_saw_base + APCS_SAW2_2_VCTL);
233 mb();
234 udelay(50);
235
236 reg_val = COREPOR_RST | CLAMP;
237 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
238 mb();
239 udelay(2);
240
241 reg_val &= ~CLAMP;
242 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
243 mb();
244 udelay(2);
245
246 reg_val &= ~COREPOR_RST;
247 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
248 mb();
249
250 reg_val |= CORE_PWRD_UP;
251 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
252 mb();
253
254 ret = 0;
255
256 iounmap(l2_saw_base);
257out_saw_map:
258 iounmap(reg);
259out_map:
260 of_node_put(saw_node);
261out_saw:
262 of_node_put(l2_node);
263out_l2:
264 of_node_put(acc_node);
265out_acc:
266 of_node_put(cpu_node);
267
268 return ret;
269}
270
188611af
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271static DEFINE_PER_CPU(int, cold_boot_done);
272
273static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
e14411da 274{
188611af 275 int ret = 0;
e14411da 276
188611af
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277 if (!per_cpu(cold_boot_done, cpu)) {
278 ret = func(cpu);
279 if (!ret)
280 per_cpu(cold_boot_done, cpu) = true;
e14411da
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281 }
282
283 /*
284 * set synchronisation state between this boot processor
285 * and the secondary one
286 */
287 spin_lock(&boot_lock);
288
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289 /*
290 * Send the secondary CPU a soft interrupt, thereby causing
291 * the boot monitor to read the system wide flags register,
292 * and branch to the address found there.
293 */
b1cffebf 294 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
e14411da 295
e14411da
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296 /*
297 * now the secondary core is starting up let it run its
298 * calibrations, then wait for it to finish
299 */
300 spin_unlock(&boot_lock);
301
188611af 302 return ret;
e14411da
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303}
304
188611af 305static int msm8660_boot_secondary(unsigned int cpu, struct task_struct *idle)
e14411da 306{
188611af 307 return qcom_boot_secondary(cpu, scss_release_secondary);
e14411da
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308}
309
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310static int kpssv1_boot_secondary(unsigned int cpu, struct task_struct *idle)
311{
312 return qcom_boot_secondary(cpu, kpssv1_release_secondary);
313}
314
6990c132
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315static int kpssv2_boot_secondary(unsigned int cpu, struct task_struct *idle)
316{
317 return qcom_boot_secondary(cpu, kpssv2_release_secondary);
318}
319
cf1e8f0c 320static void __init qcom_smp_prepare_cpus(unsigned int max_cpus)
e14411da 321{
a353e4a0 322 int cpu;
188611af 323
a353e4a0
LI
324 if (qcom_scm_set_cold_boot_addr(secondary_startup_arm,
325 cpu_present_mask)) {
188611af
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326 for_each_present_cpu(cpu) {
327 if (cpu == smp_processor_id())
328 continue;
329 set_cpu_present(cpu, false);
330 }
331 pr_warn("Failed to set CPU boot address, disabling SMP\n");
332 }
e14411da 333}
44ea349f 334
75305275 335static const struct smp_operations smp_msm8660_ops __initconst = {
cf1e8f0c
KG
336 .smp_prepare_cpus = qcom_smp_prepare_cpus,
337 .smp_secondary_init = qcom_secondary_init,
188611af 338 .smp_boot_secondary = msm8660_boot_secondary,
44ea349f 339#ifdef CONFIG_HOTPLUG_CPU
cf1e8f0c 340 .cpu_die = qcom_cpu_die,
44ea349f
MZ
341#endif
342};
188611af 343CPU_METHOD_OF_DECLARE(qcom_smp, "qcom,gcc-msm8660", &smp_msm8660_ops);
6267809f 344
75305275 345static const struct smp_operations qcom_smp_kpssv1_ops __initconst = {
6267809f
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346 .smp_prepare_cpus = qcom_smp_prepare_cpus,
347 .smp_secondary_init = qcom_secondary_init,
348 .smp_boot_secondary = kpssv1_boot_secondary,
349#ifdef CONFIG_HOTPLUG_CPU
350 .cpu_die = qcom_cpu_die,
351#endif
352};
353CPU_METHOD_OF_DECLARE(qcom_smp_kpssv1, "qcom,kpss-acc-v1", &qcom_smp_kpssv1_ops);
6990c132 354
75305275 355static const struct smp_operations qcom_smp_kpssv2_ops __initconst = {
6990c132
RV
356 .smp_prepare_cpus = qcom_smp_prepare_cpus,
357 .smp_secondary_init = qcom_secondary_init,
358 .smp_boot_secondary = kpssv2_boot_secondary,
359#ifdef CONFIG_HOTPLUG_CPU
360 .cpu_die = qcom_cpu_die,
361#endif
362};
363CPU_METHOD_OF_DECLARE(qcom_smp_kpssv2, "qcom,kpss-acc-v2", &qcom_smp_kpssv2_ops);