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   1 /**
   2  * @file op_model_arm11_core.c
   3  * ARM11 Event Monitor Driver
   4  * @remark Copyright 2004 ARM SMP Development Team
   5  */
   6 #include <linux/types.h>
   7 #include <linux/errno.h>
   8 #include <linux/oprofile.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/irq.h>
  11 #include <linux/smp.h>
  12
  13 #include "op_counter.h"
  14 #include "op_arm_model.h"
  15 #include "op_model_arm11_core.h"
  16
  17 /*
  18  * ARM11 PMU support
  19  */
  20 static inline void arm11_write_pmnc(u32 val)
  21 {
  22         /* upper 4bits and 7, 11 are write-as-0 */
  23         val &= 0x0ffff77f;
  24         asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r" (val));
  25 }
  26
  27 static inline u32 arm11_read_pmnc(void)
  28 {
  29         u32 val;
  30         asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r" (val));
  31         return val;
  32 }
  33
  34 static void arm11_reset_counter(unsigned int cnt)
  35 {
  36         u32 val = -(u32)counter_config[CPU_COUNTER(smp_processor_id(), cnt)].count;
  37         switch (cnt) {
  38         case CCNT:
  39                 asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r" (val));
  40                 break;
  41
  42         case PMN0:
  43                 asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r" (val));
  44                 break;
  45
  46         case PMN1:
  47                 asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r" (val));
  48                 break;
  49         }
  50 }
  51
  52 int arm11_setup_pmu(void)
  53 {
  54         unsigned int cnt;
  55         u32 pmnc;
  56
  57         if (arm11_read_pmnc() & PMCR_E) {
  58                 printk(KERN_ERR "oprofile: CPU%u PMU still enabled when setup new event counter.\n", smp_processor_id());
  59                 return -EBUSY;
  60         }
  61
  62         /* initialize PMNC, reset overflow, D bit, C bit and P bit. */
  63         arm11_write_pmnc(PMCR_OFL_PMN0 | PMCR_OFL_PMN1 | PMCR_OFL_CCNT |
  64                          PMCR_C | PMCR_P);
  65
  66         for (pmnc = 0, cnt = PMN0; cnt <= CCNT; cnt++) {
  67                 unsigned long event;
  68
  69                 if (!counter_config[CPU_COUNTER(smp_processor_id(), cnt)].enabled)
  70                         continue;
  71
  72                 event = counter_config[CPU_COUNTER(smp_processor_id(), cnt)].event & 255;
  73
  74                 /*
  75                  * Set event (if destined for PMNx counters)
  76                  */
  77                 if (cnt == PMN0) {
  78                         pmnc |= event << 20;
  79                 } else if (cnt == PMN1) {
  80                         pmnc |= event << 12;
  81                 }
  82
  83                 /*
  84                  * We don't need to set the event if it's a cycle count
  85                  * Enable interrupt for this counter
  86                  */
  87                 pmnc |= PMCR_IEN_PMN0 << cnt;
  88                 arm11_reset_counter(cnt);
  89         }
  90         arm11_write_pmnc(pmnc);
  91
  92         return 0;
  93 }
  94
  95 int arm11_start_pmu(void)
  96 {
  97         arm11_write_pmnc(arm11_read_pmnc() | PMCR_E);
  98         return 0;
  99 }
 100
 101 int arm11_stop_pmu(void)
 102 {
 103         unsigned int cnt;
 104
 105         arm11_write_pmnc(arm11_read_pmnc() & ~PMCR_E);
 106
 107         for (cnt = PMN0; cnt <= CCNT; cnt++)
 108                 arm11_reset_counter(cnt);
 109
 110         return 0;
 111 }
 112
 113 /*
 114  * CPU counters' IRQ handler (one IRQ per CPU)
 115  */
 116 static irqreturn_t arm11_pmu_interrupt(int irq, void *arg)
 117 {
 118         struct pt_regs *regs = get_irq_regs();
 119         unsigned int cnt;
 120         u32 pmnc;
 121
 122         pmnc = arm11_read_pmnc();
 123
 124         for (cnt = PMN0; cnt <= CCNT; cnt++) {
 125                 if ((pmnc & (PMCR_OFL_PMN0 << cnt)) && (pmnc & (PMCR_IEN_PMN0 << cnt))) {
 126                         arm11_reset_counter(cnt);
 127                         oprofile_add_sample(regs, CPU_COUNTER(smp_processor_id(), cnt));
 128                 }
 129         }
 130         /* Clear counter flag(s) */
 131         arm11_write_pmnc(pmnc);
 132         return IRQ_HANDLED;
 133 }
 134
 135 int arm11_request_interrupts(int *irqs, int nr)
 136 {
 137         unsigned int i;
 138         int ret = 0;
 139
 140         for(i = 0; i < nr; i++) {
 141                 ret = request_irq(irqs[i], arm11_pmu_interrupt, IRQF_DISABLED, "CP15 PMU", NULL);
 142                 if (ret != 0) {
 143                         printk(KERN_ERR "oprofile: unable to request IRQ%u for MPCORE-EM\n",
 144                                irqs[i]);
 145                         break;
 146                 }
 147         }
 148
 149         if (i != nr)
 150                 while (i-- != 0)
 151                         free_irq(irqs[i], NULL);
 152
 153         return ret;
 154 }
 155
 156 void arm11_release_interrupts(int *irqs, int nr)
 157 {
 158         unsigned int i;
 159
 160         for (i = 0; i < nr; i++)
 161                 free_irq(irqs[i], NULL);
 162 }