Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / arch / arm / mach-hisi / hotplug.c
blobb909854eee7f7dff96479d520123a99cbc389c5a
1 /*
2 * Copyright (c) 2013 Linaro Ltd.
3 * Copyright (c) 2013 Hisilicon Limited.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 */
10 #include <linux/cpu.h>
11 #include <linux/delay.h>
12 #include <linux/io.h>
13 #include <linux/of_address.h>
14 #include <linux/of_platform.h>
15 #include <asm/cacheflush.h>
16 #include <asm/smp_plat.h>
17 #include "core.h"
19 /* Sysctrl registers in Hi3620 SoC */
20 #define SCISOEN 0xc0
21 #define SCISODIS 0xc4
22 #define SCPERPWREN 0xd0
23 #define SCPERPWRDIS 0xd4
24 #define SCCPUCOREEN 0xf4
25 #define SCCPUCOREDIS 0xf8
26 #define SCPERCTRL0 0x200
27 #define SCCPURSTEN 0x410
28 #define SCCPURSTDIS 0x414
31 * bit definition in SCISOEN/SCPERPWREN/...
33 * CPU2_ISO_CTRL (1 << 5)
34 * CPU3_ISO_CTRL (1 << 6)
35 * ...
37 #define CPU2_ISO_CTRL (1 << 5)
40 * bit definition in SCPERCTRL0
42 * CPU0_WFI_MASK_CFG (1 << 28)
43 * CPU1_WFI_MASK_CFG (1 << 29)
44 * ...
46 #define CPU0_WFI_MASK_CFG (1 << 28)
49 * bit definition in SCCPURSTEN/...
51 * CPU0_SRST_REQ_EN (1 << 0)
52 * CPU1_SRST_REQ_EN (1 << 1)
53 * ...
55 #define CPU0_HPM_SRST_REQ_EN (1 << 22)
56 #define CPU0_DBG_SRST_REQ_EN (1 << 12)
57 #define CPU0_NEON_SRST_REQ_EN (1 << 4)
58 #define CPU0_SRST_REQ_EN (1 << 0)
60 enum {
61 HI3620_CTRL,
62 ERROR_CTRL,
65 static void __iomem *ctrl_base;
66 static int id;
68 static void set_cpu_hi3620(int cpu, bool enable)
70 u32 val = 0;
72 if (enable) {
73 /* MTCMOS set */
74 if ((cpu == 2) || (cpu == 3))
75 writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
76 ctrl_base + SCPERPWREN);
77 udelay(100);
79 /* Enable core */
80 writel_relaxed(0x01 << cpu, ctrl_base + SCCPUCOREEN);
82 /* unreset */
83 val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
84 | CPU0_SRST_REQ_EN;
85 writel_relaxed(val << cpu, ctrl_base + SCCPURSTDIS);
86 /* reset */
87 val |= CPU0_HPM_SRST_REQ_EN;
88 writel_relaxed(val << cpu, ctrl_base + SCCPURSTEN);
90 /* ISO disable */
91 if ((cpu == 2) || (cpu == 3))
92 writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
93 ctrl_base + SCISODIS);
94 udelay(1);
96 /* WFI Mask */
97 val = readl_relaxed(ctrl_base + SCPERCTRL0);
98 val &= ~(CPU0_WFI_MASK_CFG << cpu);
99 writel_relaxed(val, ctrl_base + SCPERCTRL0);
101 /* Unreset */
102 val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
103 | CPU0_SRST_REQ_EN | CPU0_HPM_SRST_REQ_EN;
104 writel_relaxed(val << cpu, ctrl_base + SCCPURSTDIS);
105 } else {
106 /* wfi mask */
107 val = readl_relaxed(ctrl_base + SCPERCTRL0);
108 val |= (CPU0_WFI_MASK_CFG << cpu);
109 writel_relaxed(val, ctrl_base + SCPERCTRL0);
111 /* disable core*/
112 writel_relaxed(0x01 << cpu, ctrl_base + SCCPUCOREDIS);
114 if ((cpu == 2) || (cpu == 3)) {
115 /* iso enable */
116 writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
117 ctrl_base + SCISOEN);
118 udelay(1);
121 /* reset */
122 val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
123 | CPU0_SRST_REQ_EN | CPU0_HPM_SRST_REQ_EN;
124 writel_relaxed(val << cpu, ctrl_base + SCCPURSTEN);
126 if ((cpu == 2) || (cpu == 3)) {
127 /* MTCMOS unset */
128 writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
129 ctrl_base + SCPERPWRDIS);
130 udelay(100);
135 static int hi3xxx_hotplug_init(void)
137 struct device_node *node;
139 node = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
140 if (node) {
141 ctrl_base = of_iomap(node, 0);
142 id = HI3620_CTRL;
143 return 0;
145 id = ERROR_CTRL;
146 return -ENOENT;
149 void hi3xxx_set_cpu(int cpu, bool enable)
151 if (!ctrl_base) {
152 if (hi3xxx_hotplug_init() < 0)
153 return;
156 if (id == HI3620_CTRL)
157 set_cpu_hi3620(cpu, enable);
160 static inline void cpu_enter_lowpower(void)
162 unsigned int v;
164 flush_cache_all();
167 * Turn off coherency and L1 D-cache
169 asm volatile(
170 " mrc p15, 0, %0, c1, c0, 1\n"
171 " bic %0, %0, #0x40\n"
172 " mcr p15, 0, %0, c1, c0, 1\n"
173 " mrc p15, 0, %0, c1, c0, 0\n"
174 " bic %0, %0, #0x04\n"
175 " mcr p15, 0, %0, c1, c0, 0\n"
176 : "=&r" (v)
177 : "r" (0)
178 : "cc");
181 void hi3xxx_cpu_die(unsigned int cpu)
183 cpu_enter_lowpower();
184 hi3xxx_set_cpu_jump(cpu, phys_to_virt(0));
185 cpu_do_idle();
187 /* We should have never returned from idle */
188 panic("cpu %d unexpectedly exit from shutdown\n", cpu);
191 int hi3xxx_cpu_kill(unsigned int cpu)
193 unsigned long timeout = jiffies + msecs_to_jiffies(50);
195 while (hi3xxx_get_cpu_jump(cpu))
196 if (time_after(jiffies, timeout))
197 return 0;
198 hi3xxx_set_cpu(cpu, false);
199 return 1;