Add SP804 delay timer driver
Add a delay timer driver for the ARM SP804 dual timer.
This driver only uses the first timer, called timer 1 in the
SP804 Technical Reference Manual (ARM DDI 0271D).
To use this driver, the BSP must provide three constants:
* The base address of the SP804 dual timer
* The clock multiplier
* The clock divider
The BSP is responsible for calling sp804_timer_init(). The SP804
driver instantiates a constant timer_ops_t and calls the generic
timer_init().
Change-Id: I49ba0a52bdf6072f403d1d0a20e305151d4bc086
Co-authored-by: Dan Handley <dan.handley@arm.com>
diff --git a/drivers/arm/sp804/sp804_delay_timer.c b/drivers/arm/sp804/sp804_delay_timer.c
new file mode 100644
index 0000000..78940bf
--- /dev/null
+++ b/drivers/arm/sp804/sp804_delay_timer.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <delay_timer.h>
+#include <mmio.h>
+
+uintptr_t sp804_base_addr;
+
+#define SP804_TIMER1_LOAD (sp804_base_addr + 0x000)
+#define SP804_TIMER1_VALUE (sp804_base_addr + 0x004)
+#define SP804_TIMER1_CONTROL (sp804_base_addr + 0x008)
+#define SP804_TIMER1_BGLOAD (sp804_base_addr + 0x018)
+
+#define TIMER_CTRL_ONESHOT (1 << 0)
+#define TIMER_CTRL_32BIT (1 << 1)
+#define TIMER_CTRL_DIV1 (0 << 2)
+#define TIMER_CTRL_DIV16 (1 << 2)
+#define TIMER_CTRL_DIV256 (2 << 2)
+#define TIMER_CTRL_IE (1 << 5)
+#define TIMER_CTRL_PERIODIC (1 << 6)
+#define TIMER_CTRL_ENABLE (1 << 7)
+
+/********************************************************************
+ * The SP804 timer delay function
+ ********************************************************************/
+uint32_t sp804_get_timer_value(void)
+{
+ return mmio_read_32(SP804_TIMER1_VALUE);
+}
+
+/********************************************************************
+ * Initialize the 1st timer in the SP804 dual timer with a base
+ * address and a timer ops
+ ********************************************************************/
+void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops)
+{
+ assert(base_addr != 0);
+ assert(ops != 0 && ops->get_timer_value == sp804_get_timer_value);
+
+ sp804_base_addr = base_addr;
+ timer_init(ops);
+
+ /* disable timer1 */
+ mmio_write_32(SP804_TIMER1_CONTROL, 0);
+ mmio_write_32(SP804_TIMER1_LOAD, UINT32_MAX);
+ mmio_write_32(SP804_TIMER1_VALUE, UINT32_MAX);
+
+ /* enable as a free running 32-bit counter */
+ mmio_write_32(SP804_TIMER1_CONTROL,
+ TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE);
+}