1 files changed, 443 insertions, 0 deletions
diff --git a/arch/arm/oprofile/op_model_xscale.c b/arch/arm/oprofile/op_model_xscale.c
new file mode 100644
index 000000000000..e0f0b320d76c
--- /dev/null
+++ b/arch/arm/oprofile/op_model_xscale.c
@@ -0,0 +1,443 @@
+/**
+ * @file op_model_xscale.c
+ * XScale Performance Monitor Driver
+ *
+ * @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
+ */
+
+/* #define DEBUG */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/oprofile.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#include "op_counter.h"
+#include "op_arm_model.h"
+
+#define	PMU_ENABLE	0x001	/* Enable counters */
+#define PMN_RESET	0x002	/* Reset event counters */
+#define	CCNT_RESET	0x004	/* Reset clock counter */
+#define	PMU_RESET	(CCNT_RESET | PMN_RESET)
+#define PMU_CNT64	0x008	/* Make CCNT count every 64th cycle */
+
+/* TODO do runtime detection */
+#ifdef CONFIG_ARCH_IOP310
+#define XSCALE_PMU_IRQ  IRQ_XS80200_PMU
+#endif
+#ifdef CONFIG_ARCH_IOP321
+#define XSCALE_PMU_IRQ  IRQ_IOP321_CORE_PMU
+#endif
+#ifdef CONFIG_ARCH_IOP331
+#define XSCALE_PMU_IRQ  IRQ_IOP331_CORE_PMU
+#endif
+#ifdef CONFIG_ARCH_PXA
+#define XSCALE_PMU_IRQ  IRQ_PMU
+#endif
+
+/*
+ * Different types of events that can be counted by the XScale PMU
+ * as used by Oprofile userspace. Here primarily for documentation
+ * purposes.
+ */
+
+#define EVT_ICACHE_MISS			0x00
+#define	EVT_ICACHE_NO_DELIVER		0x01
+#define	EVT_DATA_STALL			0x02
+#define	EVT_ITLB_MISS			0x03
+#define	EVT_DTLB_MISS			0x04
+#define	EVT_BRANCH			0x05
+#define	EVT_BRANCH_MISS			0x06
+#define	EVT_INSTRUCTION			0x07
+#define	EVT_DCACHE_FULL_STALL		0x08
+#define	EVT_DCACHE_FULL_STALL_CONTIG	0x09
+#define	EVT_DCACHE_ACCESS		0x0A
+#define	EVT_DCACHE_MISS			0x0B
+#define	EVT_DCACE_WRITE_BACK		0x0C
+#define	EVT_PC_CHANGED			0x0D
+#define	EVT_BCU_REQUEST			0x10
+#define	EVT_BCU_FULL			0x11
+#define	EVT_BCU_DRAIN			0x12
+#define	EVT_BCU_ECC_NO_ELOG		0x14
+#define	EVT_BCU_1_BIT_ERR		0x15
+#define	EVT_RMW				0x16
+/* EVT_CCNT is not hardware defined */
+#define EVT_CCNT			0xFE
+#define EVT_UNUSED			0xFF
+
+struct pmu_counter {
+	volatile unsigned long ovf;
+	unsigned long reset_counter;
+};
+
+enum { CCNT, PMN0, PMN1, PMN2, PMN3, MAX_COUNTERS };
+
+static struct pmu_counter results[MAX_COUNTERS];
+
+/*
+ * There are two versions of the PMU in current XScale processors
+ * with differing register layouts and number of performance counters.
+ * e.g. IOP321 is xsc1 whilst IOP331 is xsc2.
+ * We detect which register layout to use in xscale_detect_pmu()
+ */
+enum { PMU_XSC1, PMU_XSC2 };
+
+struct pmu_type {
+	int id;
+	char *name;
+	int num_counters;
+	unsigned int int_enable;
+	unsigned int cnt_ovf[MAX_COUNTERS];
+	unsigned int int_mask[MAX_COUNTERS];
+};
+
+static struct pmu_type pmu_parms[] = {
+	{
+		.id		= PMU_XSC1,
+		.name		= "arm/xscale1",
+		.num_counters	= 3,
+		.int_mask	= { [PMN0] = 0x10, [PMN1] = 0x20,
+				    [CCNT] = 0x40 },
+		.cnt_ovf	= { [CCNT] = 0x400, [PMN0] = 0x100,
+				    [PMN1] = 0x200},
+	},
+	{
+		.id		= PMU_XSC2,
+		.name		= "arm/xscale2",
+		.num_counters	= 5,
+		.int_mask	= { [CCNT] = 0x01, [PMN0] = 0x02,
+				    [PMN1] = 0x04, [PMN2] = 0x08,
+				    [PMN3] = 0x10 },
+		.cnt_ovf	= { [CCNT] = 0x01, [PMN0] = 0x02,
+				    [PMN1] = 0x04, [PMN2] = 0x08,
+				    [PMN3] = 0x10 },
+	},
+};
+
+static struct pmu_type *pmu;
+
+static void write_pmnc(u32 val)
+{
+	if (pmu->id == PMU_XSC1) {
+		/* upper 4bits and 7, 11 are write-as-0 */
+		val &= 0xffff77f;
+		__asm__ __volatile__ ("mcr p14, 0, %0, c0, c0, 0" : : "r" (val));
+	} else {
+		/* bits 4-23 are write-as-0, 24-31 are write ignored */
+		val &= 0xf;
+		__asm__ __volatile__ ("mcr p14, 0, %0, c0, c1, 0" : : "r" (val));
+	}
+}
+
+static u32 read_pmnc(void)
+{
+	u32 val;
+
+	if (pmu->id == PMU_XSC1)
+		__asm__ __volatile__ ("mrc p14, 0, %0, c0, c0, 0" : "=r" (val));
+	else {
+		__asm__ __volatile__ ("mrc p14, 0, %0, c0, c1, 0" : "=r" (val));
+		/* bits 1-2 and 4-23 are read-unpredictable */
+		val &= 0xff000009;
+	}
+
+	return val;
+}
+
+static u32 __xsc1_read_counter(int counter)
+{
+	u32 val = 0;
+
+	switch (counter) {
+	case CCNT:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c1, c0, 0" : "=r" (val));
+		break;
+	case PMN0:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c2, c0, 0" : "=r" (val));
+		break;
+	case PMN1:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c3, c0, 0" : "=r" (val));
+		break;
+	}
+	return val;
+}
+
+static u32 __xsc2_read_counter(int counter)
+{
+	u32 val = 0;
+
+	switch (counter) {
+	case CCNT:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c1, c1, 0" : "=r" (val));
+		break;
+	case PMN0:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c0, c2, 0" : "=r" (val));
+		break;
+	case PMN1:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c1, c2, 0" : "=r" (val));
+		break;
+	case PMN2:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c2, c2, 0" : "=r" (val));
+		break;
+	case PMN3:
+		__asm__ __volatile__ ("mrc p14, 0, %0, c3, c2, 0" : "=r" (val));
+		break;
+	}
+	return val;
+}
+
+static u32 read_counter(int counter)
+{
+	u32 val;
+
+	if (pmu->id == PMU_XSC1)
+		val = __xsc1_read_counter(counter);
+	else
+		val = __xsc2_read_counter(counter);
+
+	return val;
+}
+
+static void __xsc1_write_counter(int counter, u32 val)
+{
+	switch (counter) {
+	case CCNT:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c1, c0, 0" : : "r" (val));
+		break;
+	case PMN0:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c2, c0, 0" : : "r" (val));
+		break;
+	case PMN1:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c3, c0, 0" : : "r" (val));
+		break;
+	}
+}
+
+static void __xsc2_write_counter(int counter, u32 val)
+{
+	switch (counter) {
+	case CCNT:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c1, c1, 0" : : "r" (val));
+		break;
+	case PMN0:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c0, c2, 0" : : "r" (val));
+		break;
+	case PMN1:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c1, c2, 0" : : "r" (val));
+		break;
+	case PMN2:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c2, c2, 0" : : "r" (val));
+		break;
+	case PMN3:
+		__asm__ __volatile__ ("mcr p14, 0, %0, c3, c2, 0" : : "r" (val));
+		break;
+	}
+}
+
+static void write_counter(int counter, u32 val)
+{
+	if (pmu->id == PMU_XSC1)
+		__xsc1_write_counter(counter, val);
+	else
+		__xsc2_write_counter(counter, val);
+}
+
+static int xscale_setup_ctrs(void)
+{
+	u32 evtsel, pmnc;
+	int i;
+
+	for (i = CCNT; i < MAX_COUNTERS; i++) {
+		if (counter_config[i].enabled)
+			continue;
+
+		counter_config[i].event = EVT_UNUSED;
+	}
+
+	switch (pmu->id) {
+	case PMU_XSC1:
+		pmnc = (counter_config[PMN1].event << 20) | (counter_config[PMN0].event << 12);
+		pr_debug("xscale_setup_ctrs: pmnc: %#08x\n", pmnc);
+		write_pmnc(pmnc);
+		break;
+
+	case PMU_XSC2:
+		evtsel = counter_config[PMN0].event | (counter_config[PMN1].event << 8) |
+			(counter_config[PMN2].event << 16) | (counter_config[PMN3].event << 24);
+
+		pr_debug("xscale_setup_ctrs: evtsel %#08x\n", evtsel);
+		__asm__ __volatile__ ("mcr p14, 0, %0, c8, c1, 0" : : "r" (evtsel));
+		break;
+	}
+
+	for (i = CCNT; i < MAX_COUNTERS; i++) {
+		if (counter_config[i].event == EVT_UNUSED) {
+			counter_config[i].event = 0;
+			pmu->int_enable &= ~pmu->int_mask[i];
+			continue;
+		}
+
+		results[i].reset_counter = counter_config[i].count;
+		write_counter(i, -(u32)counter_config[i].count);
+		pmu->int_enable |= pmu->int_mask[i];
+		pr_debug("xscale_setup_ctrs: counter%d %#08x from %#08lx\n", i,
+			read_counter(i), counter_config[i].count);
+	}
+
+	return 0;
+}
+
+static void inline __xsc1_check_ctrs(void)
+{
+	int i;
+	u32 pmnc = read_pmnc();
+
+	/* NOTE: there's an A stepping errata that states if an overflow */
+	/*       bit already exists and another occurs, the previous     */
+	/*       Overflow bit gets cleared. There's no workaround.	 */
+	/*	 Fixed in B stepping or later			 	 */
+
+	/* Write the value back to clear the overflow flags. Overflow */
+	/* flags remain in pmnc for use below */
+	write_pmnc(pmnc & ~PMU_ENABLE);
+
+	for (i = CCNT; i <= PMN1; i++) {
+		if (!(pmu->int_mask[i] & pmu->int_enable))
+			continue;
+
+		if (pmnc & pmu->cnt_ovf[i])
+			results[i].ovf++;
+	}
+}
+
+static void inline __xsc2_check_ctrs(void)
+{
+	int i;
+	u32 flag = 0, pmnc = read_pmnc();
+
+	pmnc &= ~PMU_ENABLE;
+	write_pmnc(pmnc);
+
+	/* read overflow flag register */
+	__asm__ __volatile__ ("mrc p14, 0, %0, c5, c1, 0" : "=r" (flag));
+
+	for (i = CCNT; i <= PMN3; i++) {
+		if (!(pmu->int_mask[i] & pmu->int_enable))
+			continue;
+
+		if (flag & pmu->cnt_ovf[i])
+			results[i].ovf++;
+	}
+
+	/* writeback clears overflow bits */
+	__asm__ __volatile__ ("mcr p14, 0, %0, c5, c1, 0" : : "r" (flag));
+}
+
+static irqreturn_t xscale_pmu_interrupt(int irq, void *arg, struct pt_regs *regs)
+{
+	int i;
+	u32 pmnc;
+
+	if (pmu->id == PMU_XSC1)
+		__xsc1_check_ctrs();
+	else
+		__xsc2_check_ctrs();
+
+	for (i = CCNT; i < MAX_COUNTERS; i++) {
+		if (!results[i].ovf)
+			continue;
+
+		write_counter(i, -(u32)results[i].reset_counter);
+		oprofile_add_sample(regs, i);
+		results[i].ovf--;
+	}
+
+	pmnc = read_pmnc() | PMU_ENABLE;
+	write_pmnc(pmnc);
+
+	return IRQ_HANDLED;
+}
+
+static void xscale_pmu_stop(void)
+{
+	u32 pmnc = read_pmnc();
+
+	pmnc &= ~PMU_ENABLE;
+	write_pmnc(pmnc);
+
+	free_irq(XSCALE_PMU_IRQ, results);
+}
+
+static int xscale_pmu_start(void)
+{
+	int ret;
+	u32 pmnc = read_pmnc();
+
+	ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, SA_INTERRUPT,
+			"XScale PMU", (void *)results);
+
+	if (ret < 0) {
+		printk(KERN_ERR "oprofile: unable to request IRQ%d for XScale PMU\n",
+			XSCALE_PMU_IRQ);
+		return ret;
+	}
+
+	if (pmu->id == PMU_XSC1)
+		pmnc |= pmu->int_enable;
+	else {
+		__asm__ __volatile__ ("mcr p14, 0, %0, c4, c1, 0" : : "r" (pmu->int_enable));
+		pmnc &= ~PMU_CNT64;
+	}
+
+	pmnc |= PMU_ENABLE;
+	write_pmnc(pmnc);
+	pr_debug("xscale_pmu_start: pmnc: %#08x mask: %08x\n", pmnc, pmu->int_enable);
+	return 0;
+}
+
+static int xscale_detect_pmu(void)
+{
+	int ret = 0;
+	u32 id;
+
+	id = (read_cpuid(CPUID_ID) >> 13) & 0x7;
+
+	switch (id) {
+	case 1:
+		pmu = &pmu_parms[PMU_XSC1];
+		break;
+	case 2:
+		pmu = &pmu_parms[PMU_XSC2];
+		break;
+	default:
+		ret = -ENODEV;
+		break;
+	}
+
+	if (!ret) {
+		op_xscale_spec.name = pmu->name;
+		op_xscale_spec.num_counters = pmu->num_counters;
+		pr_debug("xscale_detect_pmu: detected %s PMU\n", pmu->name);
+	}
+
+	return ret;
+}
+
+struct op_arm_model_spec op_xscale_spec = {
+	.init		= xscale_detect_pmu,
+	.setup_ctrs	= xscale_setup_ctrs,
+	.start		= xscale_pmu_start,
+	.stop		= xscale_pmu_stop,
+};
+