File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/devfreq/exynos/exynos_ppmu.c b/drivers/devfreq/exynos/exynos_ppmu.c
new file mode 100644
index 0000000..97b75e5
--- /dev/null
+++ b/drivers/devfreq/exynos/exynos_ppmu.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * EXYNOS - PPMU support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/io.h>
+
+#include "exynos_ppmu.h"
+
+void exynos_ppmu_reset(void __iomem *ppmu_base)
+{
+ __raw_writel(PPMU_CYCLE_RESET | PPMU_COUNTER_RESET, ppmu_base);
+ __raw_writel(PPMU_ENABLE_CYCLE |
+ PPMU_ENABLE_COUNT0 |
+ PPMU_ENABLE_COUNT1 |
+ PPMU_ENABLE_COUNT2 |
+ PPMU_ENABLE_COUNT3,
+ ppmu_base + PPMU_CNTENS);
+}
+
+void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
+ unsigned int evt)
+{
+ __raw_writel(evt, ppmu_base + PPMU_BEVTSEL(ch));
+}
+
+void exynos_ppmu_start(void __iomem *ppmu_base)
+{
+ __raw_writel(PPMU_ENABLE, ppmu_base);
+}
+
+void exynos_ppmu_stop(void __iomem *ppmu_base)
+{
+ __raw_writel(PPMU_DISABLE, ppmu_base);
+}
+
+unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch)
+{
+ unsigned int total;
+
+ if (ch == PPMU_PMNCNT3)
+ total = ((__raw_readl(ppmu_base + PMCNT_OFFSET(ch)) << 8) |
+ __raw_readl(ppmu_base + PMCNT_OFFSET(ch + 1)));
+ else
+ total = __raw_readl(ppmu_base + PMCNT_OFFSET(ch));
+
+ return total;
+}
+
+void busfreq_mon_reset(struct busfreq_ppmu_data *ppmu_data)
+{
+ unsigned int i;
+
+ for (i = 0; i < ppmu_data->ppmu_end; i++) {
+ void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
+
+ /* Reset the performance and cycle counters */
+ exynos_ppmu_reset(ppmu_base);
+
+ /* Setup count registers to monitor read/write transactions */
+ ppmu_data->ppmu[i].event[PPMU_PMNCNT3] = RDWR_DATA_COUNT;
+ exynos_ppmu_setevent(ppmu_base, PPMU_PMNCNT3,
+ ppmu_data->ppmu[i].event[PPMU_PMNCNT3]);
+
+ exynos_ppmu_start(ppmu_base);
+ }
+}
+EXPORT_SYMBOL(busfreq_mon_reset);
+
+void exynos_read_ppmu(struct busfreq_ppmu_data *ppmu_data)
+{
+ int i, j;
+
+ for (i = 0; i < ppmu_data->ppmu_end; i++) {
+ void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
+
+ exynos_ppmu_stop(ppmu_base);
+
+ /* Update local data from PPMU */
+ ppmu_data->ppmu[i].ccnt = __raw_readl(ppmu_base + PPMU_CCNT);
+
+ for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
+ if (ppmu_data->ppmu[i].event[j] == 0)
+ ppmu_data->ppmu[i].count[j] = 0;
+ else
+ ppmu_data->ppmu[i].count[j] =
+ exynos_ppmu_read(ppmu_base, j);
+ }
+ }
+
+ busfreq_mon_reset(ppmu_data);
+}
+EXPORT_SYMBOL(exynos_read_ppmu);
+
+int exynos_get_busier_ppmu(struct busfreq_ppmu_data *ppmu_data)
+{
+ unsigned int count = 0;
+ int i, j, busy = 0;
+
+ for (i = 0; i < ppmu_data->ppmu_end; i++) {
+ for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
+ if (ppmu_data->ppmu[i].count[j] > count) {
+ count = ppmu_data->ppmu[i].count[j];
+ busy = i;
+ }
+ }
+ }
+
+ return busy;
+}
+EXPORT_SYMBOL(exynos_get_busier_ppmu);