--- /dev/null
+/**
+ * @file op_model_mpcore.c
+ * MPCORE Event Monitor Driver
+ * @remark Copyright 2004 ARM SMP Development Team
+ * @remark Copyright 2000-2004 Deepak Saxena <dsaxena@mvista.com>
+ * @remark Copyright 2000-2004 MontaVista Software Inc
+ * @remark Copyright 2004 Dave Jiang <dave.jiang@intel.com>
+ * @remark Copyright 2004 Intel Corporation
+ * @remark Copyright 2004 Zwane Mwaikambo <zwane@arm.linux.org.uk>
+ * @remark Copyright 2004 Oprofile Authors
+ *
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ *
+ * Counters:
+ * 0: PMN0 on CPU0, per-cpu configurable event counter
+ * 1: PMN1 on CPU0, per-cpu configurable event counter
+ * 2: CCNT on CPU0
+ * 3: PMN0 on CPU1
+ * 4: PMN1 on CPU1
+ * 5: CCNT on CPU1
+ * 6: PMN0 on CPU1
+ * 7: PMN1 on CPU1
+ * 8: CCNT on CPU1
+ * 9: PMN0 on CPU1
+ * 10: PMN1 on CPU1
+ * 11: CCNT on CPU1
+ * 12-19: configurable SCU event counters
+ */
+
+/* #define DEBUG */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/oprofile.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <asm/hardware.h>
+#include <asm/system.h>
+
+#include "op_counter.h"
+#include "op_arm_model.h"
+#include "op_model_arm11_core.h"
+#include "op_model_mpcore.h"
+
+/*
+ * MPCore SCU event monitor support
+ */
+#define SCU_EVENTMONITORS_VA_BASE __io_address(REALVIEW_MPCORE_SCU_BASE + 0x10)
+
+/*
+ * Bitmask of used SCU counters
+ */
+static unsigned int scu_em_used;
+
+/*
+ * 2 helper fns take a counter number from 0-7 (not the userspace-visible counter number)
+ */
+static inline void scu_reset_counter(struct eventmonitor __iomem *emc, unsigned int n)
+{
+ writel(-(u32)counter_config[SCU_COUNTER(n)].count, &emc->MC[n]);
+}
+
+static inline void scu_set_event(struct eventmonitor __iomem *emc, unsigned int n, u32 event)
+{
+ event &= 0xff;
+ writeb(event, &emc->MCEB[n]);
+}
+
+/*
+ * SCU counters' IRQ handler (one IRQ per counter => 2 IRQs per CPU)
+ */
+static irqreturn_t scu_em_interrupt(int irq, void *arg)
+{
+ struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
+ unsigned int cnt;
+
+ cnt = irq - IRQ_PMU_SCU0;
+ oprofile_add_sample(get_irq_regs(), SCU_COUNTER(cnt));
+ scu_reset_counter(emc, cnt);
+
+ /* Clear overflow flag for this counter */
+ writel(1 << (cnt + 16), &emc->PMCR);
+
+ return IRQ_HANDLED;
+}
+
+/* Configure just the SCU counters that the user has requested */
+static void scu_setup(void)
+{
+ struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
+ unsigned int i;
+
+ scu_em_used = 0;
+
+ for (i = 0; i < NUM_SCU_COUNTERS; i++) {
+ if (counter_config[SCU_COUNTER(i)].enabled &&
+ counter_config[SCU_COUNTER(i)].event) {
+ scu_set_event(emc, i, 0); /* disable counter for now */
+ scu_em_used |= 1 << i;
+ }
+ }
+}
+
+static int scu_start(void)
+{
+ struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
+ unsigned int temp, i;
+ unsigned long event;
+ int ret = 0;
+
+ /*
+ * request the SCU counter interrupts that we need
+ */
+ for (i = 0; i < NUM_SCU_COUNTERS; i++) {
+ if (scu_em_used & (1 << i)) {
+ ret = request_irq(IRQ_PMU_SCU0 + i, scu_em_interrupt, IRQF_DISABLED, "SCU PMU", NULL);
+ if (ret) {
+ printk(KERN_ERR "oprofile: unable to request IRQ%u for SCU Event Monitor\n",
+ IRQ_PMU_SCU0 + i);
+ goto err_free_scu;
+ }
+ }
+ }
+
+ /*
+ * clear overflow and enable interrupt for all used counters
+ */
+ temp = readl(&emc->PMCR);
+ for (i = 0; i < NUM_SCU_COUNTERS; i++) {
+ if (scu_em_used & (1 << i)) {
+ scu_reset_counter(emc, i);
+ event = counter_config[SCU_COUNTER(i)].event;
+ scu_set_event(emc, i, event);
+
+ /* clear overflow/interrupt */
+ temp |= 1 << (i + 16);
+ /* enable interrupt*/
+ temp |= 1 << (i + 8);
+ }
+ }
+
+ /* Enable all 8 counters */
+ temp |= PMCR_E;
+ writel(temp, &emc->PMCR);
+
+ return 0;
+
+ err_free_scu:
+ while (i--)
+ free_irq(IRQ_PMU_SCU0 + i, NULL);
+ return ret;
+}
+
+static void scu_stop(void)
+{
+ struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
+ unsigned int temp, i;
+
+ /* Disable counter interrupts */
+ /* Don't disable all 8 counters (with the E bit) as they may be in use */
+ temp = readl(&emc->PMCR);
+ for (i = 0; i < NUM_SCU_COUNTERS; i++) {
+ if (scu_em_used & (1 << i))
+ temp &= ~(1 << (i + 8));
+ }
+ writel(temp, &emc->PMCR);
+
+ /* Free counter interrupts and reset counters */
+ for (i = 0; i < NUM_SCU_COUNTERS; i++) {
+ if (scu_em_used & (1 << i)) {
+ scu_reset_counter(emc, i);
+ free_irq(IRQ_PMU_SCU0 + i, NULL);
+ }
+ }
+}
+
+struct em_function_data {
+ int (*fn)(void);
+ int ret;
+};
+
+static void em_func(void *data)
+{
+ struct em_function_data *d = data;
+ int ret = d->fn();
+ if (ret)
+ d->ret = ret;
+}
+
+static int em_call_function(int (*fn)(void))
+{
+ struct em_function_data data;
+
+ data.fn = fn;
+ data.ret = 0;
+
+ smp_call_function(em_func, &data, 1, 1);
+ em_func(&data);
+
+ return data.ret;
+}
+
+/*
+ * Glue to stick the individual ARM11 PMUs and the SCU
+ * into the oprofile framework.
+ */
+static int em_setup_ctrs(void)
+{
+ int ret;
+
+ /* Configure CPU counters by cross-calling to the other CPUs */
+ ret = em_call_function(arm11_setup_pmu);
+ if (ret == 0)
+ scu_setup();
+
+ return 0;
+}
+
+static int arm11_irqs[] = {
+ [0] = IRQ_PMU_CPU0,
+ [1] = IRQ_PMU_CPU1,
+ [2] = IRQ_PMU_CPU2,
+ [3] = IRQ_PMU_CPU3
+};
+
+static int em_start(void)
+{
+ int ret;
+
+ ret = arm11_request_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+ if (ret == 0) {
+ em_call_function(arm11_start_pmu);
+
+ ret = scu_start();
+ if (ret)
+ arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+ }
+ return ret;
+}
+
+static void em_stop(void)
+{
+ em_call_function(arm11_stop_pmu);
+ arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+ scu_stop();
+}
+
+/*
+ * Why isn't there a function to route an IRQ to a specific CPU in
+ * genirq?
+ */
+static void em_route_irq(int irq, unsigned int cpu)
+{
+ irq_desc[irq].affinity = cpumask_of_cpu(cpu);
+ irq_desc[irq].chip->set_affinity(irq, cpumask_of_cpu(cpu));
+}
+
+static int em_setup(void)
+{
+ /*
+ * Send SCU PMU interrupts to the "owner" CPU.
+ */
+ em_route_irq(IRQ_PMU_SCU0, 0);
+ em_route_irq(IRQ_PMU_SCU1, 0);
+ em_route_irq(IRQ_PMU_SCU2, 1);
+ em_route_irq(IRQ_PMU_SCU3, 1);
+ em_route_irq(IRQ_PMU_SCU4, 2);
+ em_route_irq(IRQ_PMU_SCU5, 2);
+ em_route_irq(IRQ_PMU_SCU6, 3);
+ em_route_irq(IRQ_PMU_SCU7, 3);
+
+ /*
+ * Send CP15 PMU interrupts to the owner CPU.
+ */
+ em_route_irq(IRQ_PMU_CPU0, 0);
+ em_route_irq(IRQ_PMU_CPU1, 1);
+ em_route_irq(IRQ_PMU_CPU2, 2);
+ em_route_irq(IRQ_PMU_CPU3, 3);
+
+ return 0;
+}
+
+struct op_arm_model_spec op_mpcore_spec = {
+ .init = em_setup,
+ .num_counters = MPCORE_NUM_COUNTERS,
+ .setup_ctrs = em_setup_ctrs,
+ .start = em_start,
+ .stop = em_stop,
+ .name = "arm/mpcore",
+};
--- /dev/null
+/**
+ * @file op_model_mpcore.c
+ * MPCORE Event Monitor Driver
+ * @remark Copyright 2004 ARM SMP Development Team
+ * @remark Copyright 2000-2004 Deepak Saxena <dsaxena@mvista.com>
+ * @remark Copyright 2000-2004 MontaVista Software Inc
+ * @remark Copyright 2004 Dave Jiang <dave.jiang@intel.com>
+ * @remark Copyright 2004 Intel Corporation
+ * @remark Copyright 2004 Zwane Mwaikambo <zwane@arm.linux.org.uk>
+ * @remark Copyright 2004 Oprofile Authors
+ *
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ */
+#ifndef OP_MODEL_MPCORE_H
+#define OP_MODEL_MPCORE_H
+
+struct eventmonitor {
+ unsigned long PMCR;
+ unsigned char MCEB[8];
+ unsigned long MC[8];
+};
+
+/*
+ * List of userspace counter numbers: note that the structure is important.
+ * The code relies on CPUn's counters being CPU0's counters + 3n
+ * and on CPU0's counters starting at 0
+ */
+
+#define COUNTER_CPU0_PMN0 0
+#define COUNTER_CPU0_PMN1 1
+#define COUNTER_CPU0_CCNT 2
+
+#define COUNTER_CPU1_PMN0 3
+#define COUNTER_CPU1_PMN1 4
+#define COUNTER_CPU1_CCNT 5
+
+#define COUNTER_CPU2_PMN0 6
+#define COUNTER_CPU2_PMN1 7
+#define COUNTER_CPU2_CCNT 8
+
+#define COUNTER_CPU3_PMN0 9
+#define COUNTER_CPU3_PMN1 10
+#define COUNTER_CPU3_CCNT 11
+
+#define COUNTER_SCU_MN0 12
+#define COUNTER_SCU_MN1 13
+#define COUNTER_SCU_MN2 14
+#define COUNTER_SCU_MN3 15
+#define COUNTER_SCU_MN4 16
+#define COUNTER_SCU_MN5 17
+#define COUNTER_SCU_MN6 18
+#define COUNTER_SCU_MN7 19
+#define NUM_SCU_COUNTERS 8
+
+#define SCU_COUNTER(number) ((number) + COUNTER_SCU_MN0)
+
+#define MPCORE_NUM_COUNTERS SCU_COUNTER(NUM_SCU_COUNTERS)
+
+#endif
projects / platform / kernel / linux-rpi.git / commitdiff