From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 11:13:47 +0200
Subject: Adding upstream version 2.8.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/delay_timer/generic_delay_timer.c | 62 +++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 drivers/delay_timer/generic_delay_timer.c

(limited to 'drivers/delay_timer/generic_delay_timer.c')

diff --git a/drivers/delay_timer/generic_delay_timer.c b/drivers/delay_timer/generic_delay_timer.c
new file mode 100644
index 0000000..ca522e0
--- /dev/null
+++ b/drivers/delay_timer/generic_delay_timer.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_features.h>
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <drivers/generic_delay_timer.h>
+#include <lib/utils_def.h>
+#include <plat/common/platform.h>
+
+static timer_ops_t ops;
+
+static uint32_t get_timer_value(void)
+{
+	/*
+	 * Generic delay timer implementation expects the timer to be a down
+	 * counter. We apply bitwise NOT operator to the tick values returned
+	 * by read_cntpct_el0() to simulate the down counter. The value is
+	 * clipped from 64 to 32 bits.
+	 */
+	return (uint32_t)(~read_cntpct_el0());
+}
+
+void generic_delay_timer_init_args(uint32_t mult, uint32_t div)
+{
+	ops.get_timer_value	= get_timer_value;
+	ops.clk_mult		= mult;
+	ops.clk_div		= div;
+
+	timer_init(&ops);
+
+	VERBOSE("Generic delay timer configured with mult=%u and div=%u\n",
+		mult, div);
+}
+
+void generic_delay_timer_init(void)
+{
+	assert(is_armv7_gentimer_present());
+
+	/* Value in ticks */
+	unsigned int mult = MHZ_TICKS_PER_SEC;
+
+	/* Value in ticks per second (Hz) */
+	unsigned int div  = plat_get_syscnt_freq2();
+
+	/* Reduce multiplier and divider by dividing them repeatedly by 10 */
+	while (((mult % 10U) == 0U) && ((div % 10U) == 0U)) {
+		mult /= 10U;
+		div /= 10U;
+	}
+
+	generic_delay_timer_init_args(mult, div);
+}
+
-- 
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