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firmware: exynos-acpm: add DVFS protocol

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Add ACPM DVFS protocol handler. It constructs DVFS messages that
the APM firmware can understand.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Tested-by: Peter Griffin <peter.griffin@linaro.org> # on gs101-oriole
Link: https://patch.msgid.link/20251010-acpm-clk-v6-2-321ee8826fd4@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
This commit is contained in:
Tudor Ambarus
2025-10-10 12:46:32 +00:00
committed by Krzysztof Kozlowski
parent 83c4e3c39b
commit 84a222d1b3
5 changed files with 119 additions and 1 deletions
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80
drivers/firmware/samsung/exynos-acpm-dvfs.c Normal file
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2020 Samsung Electronics Co., Ltd.
* Copyright 2020 Google LLC.
* Copyright 2025 Linaro Ltd.
*/
#include <linux/bitfield.h>
#include <linux/firmware/samsung/exynos-acpm-protocol.h>
#include <linux/ktime.h>
#include <linux/types.h>
#include <linux/units.h>
#include "exynos-acpm.h"
#include "exynos-acpm-dvfs.h"
#define ACPM_DVFS_ID GENMASK(11, 0)
#define ACPM_DVFS_REQ_TYPE GENMASK(15, 0)
#define ACPM_DVFS_FREQ_REQ 0
#define ACPM_DVFS_FREQ_GET 1
static void acpm_dvfs_set_xfer(struct acpm_xfer *xfer, u32 *cmd, size_t cmdlen,
unsigned int acpm_chan_id, bool response)
{
xfer->acpm_chan_id = acpm_chan_id;
xfer->txd = cmd;
xfer->txlen = cmdlen;
if (response) {
xfer->rxd = cmd;
xfer->rxlen = cmdlen;
}
}
static void acpm_dvfs_init_set_rate_cmd(u32 cmd[4], unsigned int clk_id,
unsigned long rate)
{
cmd[0] = FIELD_PREP(ACPM_DVFS_ID, clk_id);
cmd[1] = rate / HZ_PER_KHZ;
cmd[2] = FIELD_PREP(ACPM_DVFS_REQ_TYPE, ACPM_DVFS_FREQ_REQ);
cmd[3] = ktime_to_ms(ktime_get());
}
int acpm_dvfs_set_rate(const struct acpm_handle *handle,
unsigned int acpm_chan_id, unsigned int clk_id,
unsigned long rate)
{
struct acpm_xfer xfer = {0};
u32 cmd[4];
acpm_dvfs_init_set_rate_cmd(cmd, clk_id, rate);
acpm_dvfs_set_xfer(&xfer, cmd, sizeof(cmd), acpm_chan_id, false);
return acpm_do_xfer(handle, &xfer);
}
static void acpm_dvfs_init_get_rate_cmd(u32 cmd[4], unsigned int clk_id)
{
cmd[0] = FIELD_PREP(ACPM_DVFS_ID, clk_id);
cmd[2] = FIELD_PREP(ACPM_DVFS_REQ_TYPE, ACPM_DVFS_FREQ_GET);
cmd[3] = ktime_to_ms(ktime_get());
}
unsigned long acpm_dvfs_get_rate(const struct acpm_handle *handle,
unsigned int acpm_chan_id, unsigned int clk_id)
{
struct acpm_xfer xfer;
unsigned int cmd[4] = {0};
int ret;
acpm_dvfs_init_get_rate_cmd(cmd, clk_id);
acpm_dvfs_set_xfer(&xfer, cmd, sizeof(cmd), acpm_chan_id, true);
ret = acpm_do_xfer(handle, &xfer);
if (ret)
return 0;
return xfer.rxd[1] * HZ_PER_KHZ;
}