1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2002 ARM Ltd.
4 * All Rights Reserved
5 * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
6 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
7 */
8
9 #include <linux/init.h>
10 #include <linux/errno.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/smp.h>
16 #include <linux/io.h>
17 #include <linux/qcom_scm.h>
18
19 #include <asm/smp_plat.h>
20
21
22 #define VDD_SC1_ARRAY_CLAMP_GFS_CTL 0x35a0
23 #define SCSS_CPU1CORE_RESET 0x2d80
24 #define SCSS_DBG_STATUS_CORE_PWRDUP 0x2e64
25
26 #define APCS_CPU_PWR_CTL 0x04
27 #define PLL_CLAMP BIT(8)
28 #define CORE_PWRD_UP BIT(7)
29 #define COREPOR_RST BIT(5)
30 #define CORE_RST BIT(4)
31 #define L2DT_SLP BIT(3)
32 #define CLAMP BIT(0)
33
34 #define APC_PWR_GATE_CTL 0x14
35 #define BHS_CNT_SHIFT 24
36 #define LDO_PWR_DWN_SHIFT 16
37 #define LDO_BYP_SHIFT 8
38 #define BHS_SEG_SHIFT 1
39 #define BHS_EN BIT(0)
40
41 #define APCS_SAW2_VCTL 0x14
42 #define APCS_SAW2_2_VCTL 0x1c
43
44 extern void secondary_startup_arm(void);
45
46 #ifdef CONFIG_HOTPLUG_CPU
qcom_cpu_die(unsigned int cpu)47 static void qcom_cpu_die(unsigned int cpu)
48 {
49 wfi();
50 }
51 #endif
52
scss_release_secondary(unsigned int cpu)53 static int scss_release_secondary(unsigned int cpu)
54 {
55 struct device_node *node;
56 void __iomem *base;
57
58 node = of_find_compatible_node(NULL, NULL, "qcom,gcc-msm8660");
59 if (!node) {
60 pr_err("%s: can't find node\n", __func__);
61 return -ENXIO;
62 }
63
64 base = of_iomap(node, 0);
65 of_node_put(node);
66 if (!base)
67 return -ENOMEM;
68
69 writel_relaxed(0, base + VDD_SC1_ARRAY_CLAMP_GFS_CTL);
70 writel_relaxed(0, base + SCSS_CPU1CORE_RESET);
71 writel_relaxed(3, base + SCSS_DBG_STATUS_CORE_PWRDUP);
72 mb();
73 iounmap(base);
74
75 return 0;
76 }
77
kpssv1_release_secondary(unsigned int cpu)78 static int kpssv1_release_secondary(unsigned int cpu)
79 {
80 int ret = 0;
81 void __iomem *reg, *saw_reg;
82 struct device_node *cpu_node, *acc_node, *saw_node;
83 u32 val;
84
85 cpu_node = of_get_cpu_node(cpu, NULL);
86 if (!cpu_node)
87 return -ENODEV;
88
89 acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
90 if (!acc_node) {
91 ret = -ENODEV;
92 goto out_acc;
93 }
94
95 saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
96 if (!saw_node) {
97 ret = -ENODEV;
98 goto out_saw;
99 }
100
101 reg = of_iomap(acc_node, 0);
102 if (!reg) {
103 ret = -ENOMEM;
104 goto out_acc_map;
105 }
106
107 saw_reg = of_iomap(saw_node, 0);
108 if (!saw_reg) {
109 ret = -ENOMEM;
110 goto out_saw_map;
111 }
112
113 /* Turn on CPU rail */
114 writel_relaxed(0xA4, saw_reg + APCS_SAW2_VCTL);
115 mb();
116 udelay(512);
117
118 /* Krait bring-up sequence */
119 val = PLL_CLAMP | L2DT_SLP | CLAMP;
120 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
121 val &= ~L2DT_SLP;
122 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
123 mb();
124 ndelay(300);
125
126 val |= COREPOR_RST;
127 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
128 mb();
129 udelay(2);
130
131 val &= ~CLAMP;
132 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
133 mb();
134 udelay(2);
135
136 val &= ~COREPOR_RST;
137 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
138 mb();
139 udelay(100);
140
141 val |= CORE_PWRD_UP;
142 writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
143 mb();
144
145 iounmap(saw_reg);
146 out_saw_map:
147 iounmap(reg);
148 out_acc_map:
149 of_node_put(saw_node);
150 out_saw:
151 of_node_put(acc_node);
152 out_acc:
153 of_node_put(cpu_node);
154 return ret;
155 }
156
kpssv2_release_secondary(unsigned int cpu)157 static int kpssv2_release_secondary(unsigned int cpu)
158 {
159 void __iomem *reg;
160 struct device_node *cpu_node, *l2_node, *acc_node, *saw_node;
161 void __iomem *l2_saw_base;
162 unsigned reg_val;
163 int ret;
164
165 cpu_node = of_get_cpu_node(cpu, NULL);
166 if (!cpu_node)
167 return -ENODEV;
168
169 acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
170 if (!acc_node) {
171 ret = -ENODEV;
172 goto out_acc;
173 }
174
175 l2_node = of_parse_phandle(cpu_node, "next-level-cache", 0);
176 if (!l2_node) {
177 ret = -ENODEV;
178 goto out_l2;
179 }
180
181 saw_node = of_parse_phandle(l2_node, "qcom,saw", 0);
182 if (!saw_node) {
183 ret = -ENODEV;
184 goto out_saw;
185 }
186
187 reg = of_iomap(acc_node, 0);
188 if (!reg) {
189 ret = -ENOMEM;
190 goto out_map;
191 }
192
193 l2_saw_base = of_iomap(saw_node, 0);
194 if (!l2_saw_base) {
195 ret = -ENOMEM;
196 goto out_saw_map;
197 }
198
199 /* Turn on the BHS, turn off LDO Bypass and power down LDO */
200 reg_val = (64 << BHS_CNT_SHIFT) | (0x3f << LDO_PWR_DWN_SHIFT) | BHS_EN;
201 writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
202 mb();
203 /* wait for the BHS to settle */
204 udelay(1);
205
206 /* Turn on BHS segments */
207 reg_val |= 0x3f << BHS_SEG_SHIFT;
208 writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
209 mb();
210 /* wait for the BHS to settle */
211 udelay(1);
212
213 /* Finally turn on the bypass so that BHS supplies power */
214 reg_val |= 0x3f << LDO_BYP_SHIFT;
215 writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
216
217 /* enable max phases */
218 writel_relaxed(0x10003, l2_saw_base + APCS_SAW2_2_VCTL);
219 mb();
220 udelay(50);
221
222 reg_val = COREPOR_RST | CLAMP;
223 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
224 mb();
225 udelay(2);
226
227 reg_val &= ~CLAMP;
228 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
229 mb();
230 udelay(2);
231
232 reg_val &= ~COREPOR_RST;
233 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
234 mb();
235
236 reg_val |= CORE_PWRD_UP;
237 writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
238 mb();
239
240 ret = 0;
241
242 iounmap(l2_saw_base);
243 out_saw_map:
244 iounmap(reg);
245 out_map:
246 of_node_put(saw_node);
247 out_saw:
248 of_node_put(l2_node);
249 out_l2:
250 of_node_put(acc_node);
251 out_acc:
252 of_node_put(cpu_node);
253
254 return ret;
255 }
256
257 static DEFINE_PER_CPU(int, cold_boot_done);
258
qcom_boot_secondary(unsigned int cpu,int (* func)(unsigned int))259 static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
260 {
261 int ret = 0;
262
263 if (!per_cpu(cold_boot_done, cpu)) {
264 ret = func(cpu);
265 if (!ret)
266 per_cpu(cold_boot_done, cpu) = true;
267 }
268
269 /*
270 * Send the secondary CPU a soft interrupt, thereby causing
271 * the boot monitor to read the system wide flags register,
272 * and branch to the address found there.
273 */
274 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
275
276 return ret;
277 }
278
msm8660_boot_secondary(unsigned int cpu,struct task_struct * idle)279 static int msm8660_boot_secondary(unsigned int cpu, struct task_struct *idle)
280 {
281 return qcom_boot_secondary(cpu, scss_release_secondary);
282 }
283
kpssv1_boot_secondary(unsigned int cpu,struct task_struct * idle)284 static int kpssv1_boot_secondary(unsigned int cpu, struct task_struct *idle)
285 {
286 return qcom_boot_secondary(cpu, kpssv1_release_secondary);
287 }
288
kpssv2_boot_secondary(unsigned int cpu,struct task_struct * idle)289 static int kpssv2_boot_secondary(unsigned int cpu, struct task_struct *idle)
290 {
291 return qcom_boot_secondary(cpu, kpssv2_release_secondary);
292 }
293
qcom_smp_prepare_cpus(unsigned int max_cpus)294 static void __init qcom_smp_prepare_cpus(unsigned int max_cpus)
295 {
296 int cpu;
297
298 if (qcom_scm_set_cold_boot_addr(secondary_startup_arm,
299 cpu_present_mask)) {
300 for_each_present_cpu(cpu) {
301 if (cpu == smp_processor_id())
302 continue;
303 set_cpu_present(cpu, false);
304 }
305 pr_warn("Failed to set CPU boot address, disabling SMP\n");
306 }
307 }
308
309 static const struct smp_operations smp_msm8660_ops __initconst = {
310 .smp_prepare_cpus = qcom_smp_prepare_cpus,
311 .smp_boot_secondary = msm8660_boot_secondary,
312 #ifdef CONFIG_HOTPLUG_CPU
313 .cpu_die = qcom_cpu_die,
314 #endif
315 };
316 CPU_METHOD_OF_DECLARE(qcom_smp, "qcom,gcc-msm8660", &smp_msm8660_ops);
317
318 static const struct smp_operations qcom_smp_kpssv1_ops __initconst = {
319 .smp_prepare_cpus = qcom_smp_prepare_cpus,
320 .smp_boot_secondary = kpssv1_boot_secondary,
321 #ifdef CONFIG_HOTPLUG_CPU
322 .cpu_die = qcom_cpu_die,
323 #endif
324 };
325 CPU_METHOD_OF_DECLARE(qcom_smp_kpssv1, "qcom,kpss-acc-v1", &qcom_smp_kpssv1_ops);
326
327 static const struct smp_operations qcom_smp_kpssv2_ops __initconst = {
328 .smp_prepare_cpus = qcom_smp_prepare_cpus,
329 .smp_boot_secondary = kpssv2_boot_secondary,
330 #ifdef CONFIG_HOTPLUG_CPU
331 .cpu_die = qcom_cpu_die,
332 #endif
333 };
334 CPU_METHOD_OF_DECLARE(qcom_smp_kpssv2, "qcom,kpss-acc-v2", &qcom_smp_kpssv2_ops);
335
