Fixed MTP to work with TWRP

arch/mips/oprofile/op_model_loongson2.c

@@ -0,0 +1,161 @@
+/*
+ * Loongson2 performance counter driver for oprofile
+ *
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Yanhua <yanh@lemote.com>
+ * Author: Wu Zhangjin <wuzhangjin@gmail.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/oprofile.h>
+#include <linux/interrupt.h>
+
+#include <loongson.h>			/* LOONGSON2_PERFCNT_IRQ */
+#include "op_impl.h"
+
+#define LOONGSON2_CPU_TYPE	"mips/loongson2"
+
+#define LOONGSON2_PERFCNT_OVERFLOW		(1ULL	<< 31)
+
+#define LOONGSON2_PERFCTRL_EXL			(1UL	<<  0)
+#define LOONGSON2_PERFCTRL_KERNEL		(1UL	<<  1)
+#define LOONGSON2_PERFCTRL_SUPERVISOR		(1UL	<<  2)
+#define LOONGSON2_PERFCTRL_USER			(1UL	<<  3)
+#define LOONGSON2_PERFCTRL_ENABLE		(1UL	<<  4)
+#define LOONGSON2_PERFCTRL_EVENT(idx, event) \
+	(((event) & 0x0f) << ((idx) ? 9 : 5))
+
+#define read_c0_perfctrl() __read_64bit_c0_register($24, 0)
+#define write_c0_perfctrl(val) __write_64bit_c0_register($24, 0, val)
+#define read_c0_perfcnt() __read_64bit_c0_register($25, 0)
+#define write_c0_perfcnt(val) __write_64bit_c0_register($25, 0, val)
+
+static struct loongson2_register_config {
+	unsigned int ctrl;
+	unsigned long long reset_counter1;
+	unsigned long long reset_counter2;
+	int cnt1_enabled, cnt2_enabled;
+} reg;
+
+static char *oprofid = "LoongsonPerf";
+static irqreturn_t loongson2_perfcount_handler(int irq, void *dev_id);
+
+static void reset_counters(void *arg)
+{
+	write_c0_perfctrl(0);
+	write_c0_perfcnt(0);
+}
+
+static void loongson2_reg_setup(struct op_counter_config *cfg)
+{
+	unsigned int ctrl = 0;
+
+	reg.reset_counter1 = 0;
+	reg.reset_counter2 = 0;
+
+	/*
+	 * Compute the performance counter ctrl word.
+	 * For now, count kernel and user mode.
+	 */
+	if (cfg[0].enabled) {
+		ctrl |= LOONGSON2_PERFCTRL_EVENT(0, cfg[0].event);
+		reg.reset_counter1 = 0x80000000ULL - cfg[0].count;
+	}
+
+	if (cfg[1].enabled) {
+		ctrl |= LOONGSON2_PERFCTRL_EVENT(1, cfg[1].event);
+		reg.reset_counter2 = 0x80000000ULL - cfg[1].count;
+	}
+
+	if (cfg[0].enabled || cfg[1].enabled) {
+		ctrl |= LOONGSON2_PERFCTRL_EXL | LOONGSON2_PERFCTRL_ENABLE;
+		if (cfg[0].kernel || cfg[1].kernel)
+			ctrl |= LOONGSON2_PERFCTRL_KERNEL;
+		if (cfg[0].user || cfg[1].user)
+			ctrl |= LOONGSON2_PERFCTRL_USER;
+	}
+
+	reg.ctrl = ctrl;
+
+	reg.cnt1_enabled = cfg[0].enabled;
+	reg.cnt2_enabled = cfg[1].enabled;
+}
+
+static void loongson2_cpu_setup(void *args)
+{
+	write_c0_perfcnt((reg.reset_counter2 << 32) | reg.reset_counter1);
+}
+
+static void loongson2_cpu_start(void *args)
+{
+	/* Start all counters on current CPU */
+	if (reg.cnt1_enabled || reg.cnt2_enabled)
+		write_c0_perfctrl(reg.ctrl);
+}
+
+static void loongson2_cpu_stop(void *args)
+{
+	/* Stop all counters on current CPU */
+	write_c0_perfctrl(0);
+	memset(&reg, 0, sizeof(reg));
+}
+
+static irqreturn_t loongson2_perfcount_handler(int irq, void *dev_id)
+{
+	uint64_t counter, counter1, counter2;
+	struct pt_regs *regs = get_irq_regs();
+	int enabled;
+
+	/* Check whether the irq belongs to me */
+	enabled = read_c0_perfctrl() & LOONGSON2_PERFCTRL_ENABLE;
+	if (!enabled)
+		return IRQ_NONE;
+	enabled = reg.cnt1_enabled | reg.cnt2_enabled;
+	if (!enabled)
+		return IRQ_NONE;
+
+	counter = read_c0_perfcnt();
+	counter1 = counter & 0xffffffff;
+	counter2 = counter >> 32;
+
+	if (counter1 & LOONGSON2_PERFCNT_OVERFLOW) {
+		if (reg.cnt1_enabled)
+			oprofile_add_sample(regs, 0);
+		counter1 = reg.reset_counter1;
+	}
+	if (counter2 & LOONGSON2_PERFCNT_OVERFLOW) {
+		if (reg.cnt2_enabled)
+			oprofile_add_sample(regs, 1);
+		counter2 = reg.reset_counter2;
+	}
+
+	write_c0_perfcnt((counter2 << 32) | counter1);
+
+	return IRQ_HANDLED;
+}
+
+static int __init loongson2_init(void)
+{
+	return request_irq(LOONGSON2_PERFCNT_IRQ, loongson2_perfcount_handler,
+			   IRQF_SHARED, "Perfcounter", oprofid);
+}
+
+static void loongson2_exit(void)
+{
+	reset_counters(NULL);
+	free_irq(LOONGSON2_PERFCNT_IRQ, oprofid);
+}
+
+struct op_mips_model op_model_loongson2_ops = {
+	.reg_setup = loongson2_reg_setup,
+	.cpu_setup = loongson2_cpu_setup,
+	.init = loongson2_init,
+	.exit = loongson2_exit,
+	.cpu_start = loongson2_cpu_start,
+	.cpu_stop = loongson2_cpu_stop,
+	.cpu_type = LOONGSON2_CPU_TYPE,
+	.num_counters = 2
+};