target/linux/ipq806x/patches/0014-ARM-qcom-Add-SMP-support-for-KPSSv2.patch

   1 From eb07c23d45ddf10fa89296e6c6c6aed553d8bbf5 Mon Sep 17 00:00:00 2001
   2 From: Rohit Vaswani <rvaswani@codeaurora.org>
   3 Date: Fri, 21 Jun 2013 17:09:13 -0700
   4 Subject: [PATCH 014/182] ARM: qcom: Add SMP support for KPSSv2
   5
   6 Implement support for the Krait CPU release sequence when the
   7 CPUs are part of the second version of the Krait processor
   8 subsystem.
   9
  10 Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
  11 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  12 Signed-off-by: Kumar Gala <galak@codeaurora.org>
  13 ---
  14  arch/arm/mach-qcom/platsmp.c |  123 ++++++++++++++++++++++++++++++++++++++++++
  15  1 file changed, 123 insertions(+)
  16
  17 --- a/arch/arm/mach-qcom/platsmp.c
  18 +++ b/arch/arm/mach-qcom/platsmp.c
  19 @@ -34,7 +34,15 @@
  20  #define L2DT_SLP               BIT(3)
  21  #define CLAMP                  BIT(0)
  22
  23 +#define APC_PWR_GATE_CTL       0x14
  24 +#define BHS_CNT_SHIFT          24
  25 +#define LDO_PWR_DWN_SHIFT      16
  26 +#define LDO_BYP_SHIFT          8
  27 +#define BHS_SEG_SHIFT          1
  28 +#define BHS_EN                 BIT(0)
  29 +
  30  #define APCS_SAW2_VCTL         0x14
  31 +#define APCS_SAW2_2_VCTL       0x1c
  32
  33  extern void secondary_startup(void);
  34
  35 @@ -160,6 +168,106 @@ out_acc:
  36         return ret;
  37  }
  38
  39 +static int kpssv2_release_secondary(unsigned int cpu)
  40 +{
  41 +       void __iomem *reg;
  42 +       struct device_node *cpu_node, *l2_node, *acc_node, *saw_node;
  43 +       void __iomem *l2_saw_base;
  44 +       unsigned reg_val;
  45 +       int ret;
  46 +
  47 +       cpu_node = of_get_cpu_node(cpu, NULL);
  48 +       if (!cpu_node)
  49 +               return -ENODEV;
  50 +
  51 +       acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
  52 +       if (!acc_node) {
  53 +               ret = -ENODEV;
  54 +               goto out_acc;
  55 +       }
  56 +
  57 +       l2_node = of_parse_phandle(cpu_node, "next-level-cache", 0);
  58 +       if (!l2_node) {
  59 +               ret = -ENODEV;
  60 +               goto out_l2;
  61 +       }
  62 +
  63 +       saw_node = of_parse_phandle(l2_node, "qcom,saw", 0);
  64 +       if (!saw_node) {
  65 +               ret = -ENODEV;
  66 +               goto out_saw;
  67 +       }
  68 +
  69 +       reg = of_iomap(acc_node, 0);
  70 +       if (!reg) {
  71 +               ret = -ENOMEM;
  72 +               goto out_map;
  73 +       }
  74 +
  75 +       l2_saw_base = of_iomap(saw_node, 0);
  76 +       if (!l2_saw_base) {
  77 +               ret = -ENOMEM;
  78 +               goto out_saw_map;
  79 +       }
  80 +
  81 +       /* Turn on the BHS, turn off LDO Bypass and power down LDO */
  82 +       reg_val = (64 << BHS_CNT_SHIFT) | (0x3f << LDO_PWR_DWN_SHIFT) | BHS_EN;
  83 +       writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
  84 +       mb();
  85 +       /* wait for the BHS to settle */
  86 +       udelay(1);
  87 +
  88 +       /* Turn on BHS segments */
  89 +       reg_val |= 0x3f << BHS_SEG_SHIFT;
  90 +       writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
  91 +       mb();
  92 +        /* wait for the BHS to settle */
  93 +       udelay(1);
  94 +
  95 +       /* Finally turn on the bypass so that BHS supplies power */
  96 +       reg_val |= 0x3f << LDO_BYP_SHIFT;
  97 +       writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
  98 +
  99 +       /* enable max phases */
 100 +       writel_relaxed(0x10003, l2_saw_base + APCS_SAW2_2_VCTL);
 101 +       mb();
 102 +       udelay(50);
 103 +
 104 +       reg_val = COREPOR_RST | CLAMP;
 105 +       writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
 106 +       mb();
 107 +       udelay(2);
 108 +
 109 +       reg_val &= ~CLAMP;
 110 +       writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
 111 +       mb();
 112 +       udelay(2);
 113 +
 114 +       reg_val &= ~COREPOR_RST;
 115 +       writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
 116 +       mb();
 117 +
 118 +       reg_val |= CORE_PWRD_UP;
 119 +       writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
 120 +       mb();
 121 +
 122 +       ret = 0;
 123 +
 124 +       iounmap(l2_saw_base);
 125 +out_saw_map:
 126 +       iounmap(reg);
 127 +out_map:
 128 +       of_node_put(saw_node);
 129 +out_saw:
 130 +       of_node_put(l2_node);
 131 +out_l2:
 132 +       of_node_put(acc_node);
 133 +out_acc:
 134 +       of_node_put(cpu_node);
 135 +
 136 +       return ret;
 137 +}
 138 +
 139  static DEFINE_PER_CPU(int, cold_boot_done);
 140
 141  static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
 142 @@ -204,6 +312,11 @@ static int kpssv1_boot_secondary(unsigne
 143         return qcom_boot_secondary(cpu, kpssv1_release_secondary);
 144  }
 145
 146 +static int kpssv2_boot_secondary(unsigned int cpu, struct task_struct *idle)
 147 +{
 148 +       return qcom_boot_secondary(cpu, kpssv2_release_secondary);
 149 +}
 150 +
 151  static void __init qcom_smp_prepare_cpus(unsigned int max_cpus)
 152  {
 153         int cpu, map;
 154 @@ -253,3 +366,13 @@ static struct smp_operations qcom_smp_kp
 155  #endif
 156  };
 157  CPU_METHOD_OF_DECLARE(qcom_smp_kpssv1, "qcom,kpss-acc-v1", &qcom_smp_kpssv1_ops);
 158 +
 159 +static struct smp_operations qcom_smp_kpssv2_ops __initdata = {
 160 +       .smp_prepare_cpus       = qcom_smp_prepare_cpus,
 161 +       .smp_secondary_init     = qcom_secondary_init,
 162 +       .smp_boot_secondary     = kpssv2_boot_secondary,
 163 +#ifdef CONFIG_HOTPLUG_CPU
 164 +       .cpu_die                = qcom_cpu_die,
 165 +#endif
 166 +};
 167 +CPU_METHOD_OF_DECLARE(qcom_smp_kpssv2, "qcom,kpss-acc-v2", &qcom_smp_kpssv2_ops);