[PATCH v4 07/12] rvtrace: Add trace ramsink driver

[Sergey Matyukevich]

> From: Mayuresh Chitale <mayuresh.chitale at oss.qualcomm.com>
> 
> Add initial implementation of RISC-V trace ramsink driver. The ramsink
> is defined in the RISC-V Trace Control Interface specification.
> 
> Co-developed-by: Anup Patel <anup.patel at oss.qualcomm.com>
> Signed-off-by: Anup Patel <anup.patel at oss.qualcomm.com>
> Signed-off-by: Mayuresh Chitale <mayuresh.chitale at oss.qualcomm.com>
> ---
>  drivers/hwtracing/rvtrace/Kconfig           |   9 +
>  drivers/hwtracing/rvtrace/Makefile          |   1 +
>  drivers/hwtracing/rvtrace/rvtrace-ramsink.c | 338 ++++++++++++++++++++
>  3 files changed, 348 insertions(+)
>  create mode 100644 drivers/hwtracing/rvtrace/rvtrace-ramsink.c

...

> +static int rvtrace_ramsink_start(struct rvtrace_component *comp)
> +{
> +	int ret;
> +	u32 val;
> +
> +	val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET);
> +	val |= BIT(RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT);
> +	rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET);
> +	ret = rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET,
> +			       RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT, 1,
> +			       comp->pdata->control_poll_timeout_usecs);

IIUC the code fragment above duplicates 'rvtrace_enable_component' from
rvtrace-core.c.

> +	if (ret)
> +		dev_err(&comp->dev, "failed to start ramsink.\n");
> +
> +	return ret;
> +}
> +
> +static int rvtrace_ramsink_stop(struct rvtrace_component *comp)
> +{
> +	int ret;
> +	u32 val;
> +
> +	val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET);
> +	val &= ~BIT(RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT);
> +	rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET);
> +	ret = rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET,
> +			       RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT, 0,
> +			       comp->pdata->control_poll_timeout_usecs);


IIUC the code fragment above duplicates 'rvtrace_disable_component' from
rvtrace-core.c.

> +	if (ret) {
> +		dev_err(&comp->dev, "failed to stop ramsink.\n");
> +		return ret;
> +	}
> +
> +	return rvtrace_comp_poll_empty(comp);
> +}

Regards,
Sergey