arch/arm/mach-hisi/hotplug.c

   1 /*
   2  * Copyright (c) 2013 Linaro Ltd.
   3  * Copyright (c) 2013 Hisilicon Limited.
   4  *
   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  */
   9
  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"
  18
  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
  29
  30 /*
  31  * bit definition in SCISOEN/SCPERPWREN/...
  32  *
  33  * CPU2_ISO_CTRL        (1 << 5)
  34  * CPU3_ISO_CTRL        (1 << 6)
  35  * ...
  36  */
  37 #define CPU2_ISO_CTRL                   (1 << 5)
  38
  39 /*
  40  * bit definition in SCPERCTRL0
  41  *
  42  * CPU0_WFI_MASK_CFG    (1 << 28)
  43  * CPU1_WFI_MASK_CFG    (1 << 29)
  44  * ...
  45  */
  46 #define CPU0_WFI_MASK_CFG               (1 << 28)
  47
  48 /*
  49  * bit definition in SCCPURSTEN/...
  50  *
  51  * CPU0_SRST_REQ_EN     (1 << 0)
  52  * CPU1_SRST_REQ_EN     (1 << 1)
  53  * ...
  54  */
  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)
  59
  60 #define HIX5HD2_PERI_CRG20              0x50
  61 #define CRG20_CPU1_RESET                (1 << 17)
  62
  63 #define HIX5HD2_PERI_PMC0               0x1000
  64 #define PMC0_CPU1_WAIT_MTCOMS_ACK       (1 << 8)
  65 #define PMC0_CPU1_PMC_ENABLE            (1 << 7)
  66 #define PMC0_CPU1_POWERDOWN             (1 << 3)
  67
  68 #define HIP01_PERI9                    0x50
  69 #define PERI9_CPU1_RESET               (1 << 1)
  70
  71 enum {
  72         HI3620_CTRL,
  73         ERROR_CTRL,
  74 };
  75
  76 static void __iomem *ctrl_base;
  77 static int id;
  78
  79 static void set_cpu_hi3620(int cpu, bool enable)
  80 {
  81         u32 val = 0;
  82
  83         if (enable) {
  84                 /* MTCMOS set */
  85                 if ((cpu == 2) || (cpu == 3))
  86                         writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
  87                                        ctrl_base + SCPERPWREN);
  88                 udelay(100);
  89
  90                 /* Enable core */
  91                 writel_relaxed(0x01 << cpu, ctrl_base + SCCPUCOREEN);
  92
  93                 /* unreset */
  94                 val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
  95                         | CPU0_SRST_REQ_EN;
  96                 writel_relaxed(val << cpu, ctrl_base + SCCPURSTDIS);
  97                 /* reset */
  98                 val |= CPU0_HPM_SRST_REQ_EN;
  99                 writel_relaxed(val << cpu, ctrl_base + SCCPURSTEN);
 100
 101                 /* ISO disable */
 102                 if ((cpu == 2) || (cpu == 3))
 103                         writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
 104                                        ctrl_base + SCISODIS);
 105                 udelay(1);
 106
 107                 /* WFI Mask */
 108                 val = readl_relaxed(ctrl_base + SCPERCTRL0);
 109                 val &= ~(CPU0_WFI_MASK_CFG << cpu);
 110                 writel_relaxed(val, ctrl_base + SCPERCTRL0);
 111
 112                 /* Unreset */
 113                 val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
 114                         | CPU0_SRST_REQ_EN | CPU0_HPM_SRST_REQ_EN;
 115                 writel_relaxed(val << cpu, ctrl_base + SCCPURSTDIS);
 116         } else {
 117                 /* wfi mask */
 118                 val = readl_relaxed(ctrl_base + SCPERCTRL0);
 119                 val |= (CPU0_WFI_MASK_CFG << cpu);
 120                 writel_relaxed(val, ctrl_base + SCPERCTRL0);
 121
 122                 /* disable core*/
 123                 writel_relaxed(0x01 << cpu, ctrl_base + SCCPUCOREDIS);
 124
 125                 if ((cpu == 2) || (cpu == 3)) {
 126                         /* iso enable */
 127                         writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
 128                                        ctrl_base + SCISOEN);
 129                         udelay(1);
 130                 }
 131
 132                 /* reset */
 133                 val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
 134                         | CPU0_SRST_REQ_EN | CPU0_HPM_SRST_REQ_EN;
 135                 writel_relaxed(val << cpu, ctrl_base + SCCPURSTEN);
 136
 137                 if ((cpu == 2) || (cpu == 3)) {
 138                         /* MTCMOS unset */
 139                         writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
 140                                        ctrl_base + SCPERPWRDIS);
 141                         udelay(100);
 142                 }
 143         }
 144 }
 145
 146 static int hi3xxx_hotplug_init(void)
 147 {
 148         struct device_node *node;
 149
 150         node = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
 151         if (node) {
 152                 ctrl_base = of_iomap(node, 0);
 153                 id = HI3620_CTRL;
 154                 return 0;
 155         }
 156         id = ERROR_CTRL;
 157         return -ENOENT;
 158 }
 159
 160 void hi3xxx_set_cpu(int cpu, bool enable)
 161 {
 162         if (!ctrl_base) {
 163                 if (hi3xxx_hotplug_init() < 0)
 164                         return;
 165         }
 166
 167         if (id == HI3620_CTRL)
 168                 set_cpu_hi3620(cpu, enable);
 169 }
 170
 171 static bool hix5hd2_hotplug_init(void)
 172 {
 173         struct device_node *np;
 174
 175         np = of_find_compatible_node(NULL, NULL, "hisilicon,cpuctrl");
 176         if (np) {
 177                 ctrl_base = of_iomap(np, 0);
 178                 return true;
 179         }
 180         return false;
 181 }
 182
 183 void hix5hd2_set_cpu(int cpu, bool enable)
 184 {
 185         u32 val = 0;
 186
 187         if (!ctrl_base)
 188                 if (!hix5hd2_hotplug_init())
 189                         BUG();
 190
 191         if (enable) {
 192                 /* power on cpu1 */
 193                 val = readl_relaxed(ctrl_base + HIX5HD2_PERI_PMC0);
 194                 val &= ~(PMC0_CPU1_WAIT_MTCOMS_ACK | PMC0_CPU1_POWERDOWN);
 195                 val |= PMC0_CPU1_PMC_ENABLE;
 196                 writel_relaxed(val, ctrl_base + HIX5HD2_PERI_PMC0);
 197                 /* unreset */
 198                 val = readl_relaxed(ctrl_base + HIX5HD2_PERI_CRG20);
 199                 val &= ~CRG20_CPU1_RESET;
 200                 writel_relaxed(val, ctrl_base + HIX5HD2_PERI_CRG20);
 201         } else {
 202                 /* power down cpu1 */
 203                 val = readl_relaxed(ctrl_base + HIX5HD2_PERI_PMC0);
 204                 val |= PMC0_CPU1_PMC_ENABLE | PMC0_CPU1_POWERDOWN;
 205                 val &= ~PMC0_CPU1_WAIT_MTCOMS_ACK;
 206                 writel_relaxed(val, ctrl_base + HIX5HD2_PERI_PMC0);
 207
 208                 /* reset */
 209                 val = readl_relaxed(ctrl_base + HIX5HD2_PERI_CRG20);
 210                 val |= CRG20_CPU1_RESET;
 211                 writel_relaxed(val, ctrl_base + HIX5HD2_PERI_CRG20);
 212         }
 213 }
 214
 215 void hip01_set_cpu(int cpu, bool enable)
 216 {
 217         unsigned int temp;
 218         struct device_node *np;
 219
 220         if (!ctrl_base) {
 221                 np = of_find_compatible_node(NULL, NULL, "hisilicon,hip01-sysctrl");
 222                 if (np)
 223                         ctrl_base = of_iomap(np, 0);
 224                 else
 225                         BUG();
 226         }
 227
 228         if (enable) {
 229                 /* reset on CPU1  */
 230                 temp = readl_relaxed(ctrl_base + HIP01_PERI9);
 231                 temp |= PERI9_CPU1_RESET;
 232                 writel_relaxed(temp, ctrl_base + HIP01_PERI9);
 233
 234                 udelay(50);
 235
 236                 /* unreset on CPU1 */
 237                 temp = readl_relaxed(ctrl_base + HIP01_PERI9);
 238                 temp &= ~PERI9_CPU1_RESET;
 239                 writel_relaxed(temp, ctrl_base + HIP01_PERI9);
 240         }
 241 }
 242
 243 static inline void cpu_enter_lowpower(void)
 244 {
 245         unsigned int v;
 246
 247         flush_cache_all();
 248
 249         /*
 250          * Turn off coherency and L1 D-cache
 251          */
 252         asm volatile(
 253         "       mrc     p15, 0, %0, c1, c0, 1\n"
 254         "       bic     %0, %0, #0x40\n"
 255         "       mcr     p15, 0, %0, c1, c0, 1\n"
 256         "       mrc     p15, 0, %0, c1, c0, 0\n"
 257         "       bic     %0, %0, #0x04\n"
 258         "       mcr     p15, 0, %0, c1, c0, 0\n"
 259           : "=&r" (v)
 260           : "r" (0)
 261           : "cc");
 262 }
 263
 264 #ifdef CONFIG_HOTPLUG_CPU
 265 void hi3xxx_cpu_die(unsigned int cpu)
 266 {
 267         cpu_enter_lowpower();
 268         hi3xxx_set_cpu_jump(cpu, phys_to_virt(0));
 269         cpu_do_idle();
 270
 271         /* We should have never returned from idle */
 272         panic("cpu %d unexpectedly exit from shutdown\n", cpu);
 273 }
 274
 275 int hi3xxx_cpu_kill(unsigned int cpu)
 276 {
 277         unsigned long timeout = jiffies + msecs_to_jiffies(50);
 278
 279         while (hi3xxx_get_cpu_jump(cpu))
 280                 if (time_after(jiffies, timeout))
 281                         return 0;
 282         hi3xxx_set_cpu(cpu, false);
 283         return 1;
 284 }
 285
 286 void hix5hd2_cpu_die(unsigned int cpu)
 287 {
 288         flush_cache_all();
 289         hix5hd2_set_cpu(cpu, false);
 290 }
 291 #endif