refactor(st-clock): update STGEN management
Rework STGEN config function, and move it to stm32mp_clkfunc.c file.
Change-Id: I7784a79c486d1b8811f6f8d123e49ea34899e9b6
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/drivers/st/clk/stm32mp_clkfunc.c b/drivers/st/clk/stm32mp_clkfunc.c
index 5ba64fd..a013a82 100644
--- a/drivers/st/clk/stm32mp_clkfunc.c
+++ b/drivers/st/clk/stm32mp_clkfunc.c
@@ -6,10 +6,13 @@
#include <errno.h>
+#include <arch_helpers.h>
#include <common/fdt_wrappers.h>
#include <drivers/clk.h>
+#include <drivers/generic_delay_timer.h>
#include <drivers/st/stm32_gpio.h>
#include <drivers/st/stm32mp_clkfunc.h>
+#include <lib/mmio.h>
#include <libfdt.h>
#include <platform_def.h>
@@ -318,3 +321,60 @@
return clk_get_rate((unsigned long)clk_id);
}
+
+/*******************************************************************************
+ * This function configures and restores the STGEN counter depending on the
+ * connected clock.
+ ******************************************************************************/
+void stm32mp_stgen_config(unsigned long rate)
+{
+ uint32_t cntfid0;
+ unsigned long long counter;
+
+ cntfid0 = mmio_read_32(STGEN_BASE + CNTFID_OFF);
+
+ if (cntfid0 == rate) {
+ return;
+ }
+
+ mmio_clrbits_32(STGEN_BASE + CNTCR_OFF, CNTCR_EN);
+ counter = stm32mp_stgen_get_counter() * rate / cntfid0;
+
+ mmio_write_32(STGEN_BASE + CNTCVL_OFF, (uint32_t)counter);
+ mmio_write_32(STGEN_BASE + CNTCVU_OFF, (uint32_t)(counter >> 32));
+ mmio_write_32(STGEN_BASE + CNTFID_OFF, rate);
+ mmio_setbits_32(STGEN_BASE + CNTCR_OFF, CNTCR_EN);
+
+ write_cntfrq_el0(rate);
+
+ /* Need to update timer with new frequency */
+ generic_delay_timer_init();
+}
+
+/*******************************************************************************
+ * This function returns the STGEN counter value.
+ ******************************************************************************/
+unsigned long long stm32mp_stgen_get_counter(void)
+{
+ return (((unsigned long long)mmio_read_32(STGEN_BASE + CNTCVU_OFF) << 32) |
+ mmio_read_32(STGEN_BASE + CNTCVL_OFF));
+}
+
+/*******************************************************************************
+ * This function restores the STGEN counter value.
+ * It takes a first input value as a counter backup value to be restored and a
+ * offset in ms to be added.
+ ******************************************************************************/
+void stm32mp_stgen_restore_counter(unsigned long long value,
+ unsigned long long offset_in_ms)
+{
+ unsigned long long cnt;
+
+ cnt = value + ((offset_in_ms *
+ mmio_read_32(STGEN_BASE + CNTFID_OFF)) / 1000U);
+
+ mmio_clrbits_32(STGEN_BASE + CNTCR_OFF, CNTCR_EN);
+ mmio_write_32(STGEN_BASE + CNTCVL_OFF, (uint32_t)cnt);
+ mmio_write_32(STGEN_BASE + CNTCVU_OFF, (uint32_t)(cnt >> 32));
+ mmio_setbits_32(STGEN_BASE + CNTCR_OFF, CNTCR_EN);
+}