soc: esp32c3: added initial soc support files for esp32c3
by adding the soc specific files such: soc initialization code,
linker scripts and support for esp32c3 devkitm
Signed-off-by: Felipe Neves <ryukokki.felipe@gmail.com>
Signed-off-by: Felipe Neves <felipe.neves@espressif.com>
diff --git a/drivers/timer/esp32c3_sys_timer.c b/drivers/timer/esp32c3_sys_timer.c
new file mode 100644
index 0000000..59bc2e8
--- /dev/null
+++ b/drivers/timer/esp32c3_sys_timer.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <soc/soc_caps.h>
+#include <soc/soc.h>
+#include <soc/interrupt_core0_reg.h>
+#include <soc/periph_defs.h>
+#include <soc/system_reg.h>
+#include <hal/systimer_hal.h>
+#include <hal/systimer_ll.h>
+#include <rom/ets_sys.h>
+#include <esp_attr.h>
+
+#include <drivers/timer/system_timer.h>
+#include <sys_clock.h>
+#include <soc.h>
+
+#define SYS_TIMER_CPU_IRQ 1
+
+static void sys_timer_isr(const void *arg)
+{
+ ARG_UNUSED(arg);
+ systimer_ll_clear_alarm_int(SYSTIMER_ALARM_0);
+ sys_clock_announce(1);
+}
+
+int sys_clock_driver_init(const struct device *dev)
+{
+ ARG_UNUSED(dev);
+
+ esp32c3_rom_intr_matrix_set(0, ETS_SYSTIMER_TARGET0_EDGE_INTR_SOURCE, SYS_TIMER_CPU_IRQ);
+ IRQ_CONNECT(SYS_TIMER_CPU_IRQ, 0, sys_timer_isr, NULL, 0);
+ irq_enable(SYS_TIMER_CPU_IRQ);
+
+ systimer_hal_init();
+ systimer_hal_connect_alarm_counter(SYSTIMER_ALARM_0, SYSTIMER_COUNTER_1);
+ systimer_hal_enable_counter(SYSTIMER_COUNTER_1);
+ systimer_hal_counter_can_stall_by_cpu(SYSTIMER_COUNTER_1, 0, true);
+ systimer_hal_set_alarm_period(SYSTIMER_ALARM_0,
+ CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / CONFIG_SYS_CLOCK_TICKS_PER_SEC);
+ systimer_hal_select_alarm_mode(SYSTIMER_ALARM_0, SYSTIMER_ALARM_MODE_PERIOD);
+ systimer_hal_enable_alarm_int(SYSTIMER_ALARM_0);
+
+ return 0;
+}
+
+void sys_clock_set_timeout(int32_t ticks, bool idle)
+{
+ ARG_UNUSED(idle);
+ ARG_UNUSED(ticks);
+}
+
+uint32_t sys_clock_elapsed(void)
+{
+ /* Tickless is not supported yet */
+ return 0;
+}
+
+uint32_t sys_clock_cycle_get_32(void)
+{
+ return systimer_ll_get_counter_value_low(SYSTIMER_COUNTER_1);
+}
