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i.MX7D: Compute clock frequency for the fixed frequency clocks.

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CCM derived clocks will have to be added later.

Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jean-Christophe Dubois 2022-12-20 18:27:39 +01:00 committed by Peter Maydell
parent 60c98e7205
commit 111c4c49c3
1 changed files with 40 additions and 9 deletions
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49
hw/misc/imx7_ccm.c
View file

@ -16,6 +16,10 @@
#include "hw/misc/imx7_ccm.h"
#include "migration/vmstate.h"
#include "trace.h"
#define CKIH_FREQ 24000000 /* 24MHz crystal input */
static void imx7_analog_reset(DeviceState *dev)
{
IMX7AnalogState *s = IMX7_ANALOG(dev);
@ -219,16 +223,43 @@ static const VMStateDescription vmstate_imx7_ccm = {
static uint32_t imx7_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock)
{
/*
* This function is "consumed" by GPT emulation code, however on
* i.MX7 each GPT block can have their own clock root. This means
* that this functions needs somehow to know requester's identity
* and the way to pass it: be it via additional IMXClk constants
* or by adding another argument to this method needs to be
* figured out
* This function is "consumed" by GPT emulation code. Some clocks
* have fixed frequencies and we can provide requested frequency
* easily. However for CCM provided clocks (like IPG) each GPT
* timer can have its own clock root.
* This means we need additionnal information when calling this
* function to know the requester's identity.
*/
qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Not implemented\n",
TYPE_IMX7_CCM, __func__);
return 0;
uint32_t freq = 0;
switch (clock) {
case CLK_NONE:
break;
case CLK_32k:
freq = CKIL_FREQ;
break;
case CLK_HIGH:
freq = CKIH_FREQ;
break;
case CLK_IPG:
case CLK_IPG_HIGH:
/*
* For now we don't have a way to figure out the device this
* function is called for. Until then the IPG derived clocks
* are left unimplemented.
*/
qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Clock %d Not implemented\n",
TYPE_IMX7_CCM, __func__, clock);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: unsupported clock %d\n",
TYPE_IMX7_CCM, __func__, clock);
break;
}
trace_ccm_clock_freq(clock, freq);
return freq;
}
static void imx7_ccm_class_init(ObjectClass *klass, void *data)