Date:   Tue, 12 Jun 2018 13:06:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     viresh.kumar@...aro.org, sboyd@...nel.org, andy.gross@...aro.org,
        ulf.hansson@...aro.org, collinsd@...eaurora.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/7] soc: qcom: Add RPMh Power domain driver

On Tue, Jun 12, 2018 at 10:10:51AM +0530, Rajendra Nayak wrote:
> The RPMh Power domain driver aggregates the corner votes from various
> consumers for the ARC resources and communicates it to RPMh.
> 
> We also add data for all power domains on sdm845 SoC as part of the patch.
> The driver can be extended to support other SoCs which support RPMh
> 
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  drivers/soc/qcom/Kconfig                |   9 +
>  drivers/soc/qcom/Makefile               |   1 +
>  drivers/soc/qcom/rpmhpd.c               | 427 ++++++++++++++++++++++++
>  include/dt-bindings/power/qcom-rpmhpd.h |  31 ++

These includes should go with the binding.

>  4 files changed, 468 insertions(+)
>  create mode 100644 drivers/soc/qcom/rpmhpd.c
>  create mode 100644 include/dt-bindings/power/qcom-rpmhpd.h
> 
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index 5c54931a7b99..7cb7eba2b997 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -74,6 +74,15 @@ config QCOM_RMTFS_MEM
>  
>  	  Say y here if you intend to boot the modem remoteproc.
>  
> +config QCOM_RPMHPD
> +	tristate "Qualcomm RPMh Power domain driver"
> +	depends on QCOM_RPMH && QCOM_COMMAND_DB
> +	help
> +	  QCOM RPMh Power domain driver to support power-domains with
> +	  performance states. The driver communicates a performance state
> +	  value to RPMh which then translates it into corresponding voltage
> +	  for the voltage rail.
> +
>  config QCOM_RPMPD
>  	tristate "Qualcomm RPM Power domain driver"
>  	depends on MFD_QCOM_RPM && QCOM_SMD_RPM
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index 9550c170de93..499513f63bef 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -16,3 +16,4 @@ obj-$(CONFIG_QCOM_SMSM)	+= smsm.o
>  obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
>  obj-$(CONFIG_QCOM_APR) += apr.o
>  obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
> +obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o
> diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
> new file mode 100644
> index 000000000000..7083ec1590ff
> --- /dev/null
> +++ b/drivers/soc/qcom/rpmhpd.c
> @@ -0,0 +1,427 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2018, The Linux Foundation. All rights reserved.*/
> +
> +#include <linux/err.h>
> +#include <linux/export.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/pm_domain.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_opp.h>
> +#include <soc/qcom/cmd-db.h>
> +#include <soc/qcom/rpmh.h>
> +#include <dt-bindings/power/qcom-rpmhpd.h>
> +
> +#define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
> +
> +#define DEFINE_RPMHPD_AO(_platform, _name, _active)			\
> +	static struct rpmhpd _platform##_##_active;			\
> +	static struct rpmhpd _platform##_##_name = {			\
> +		.pd = {	.name = #_name,	},				\
> +		.peer = &_platform##_##_active,				\
> +		.res_name = #_name".lvl",				\
> +		.valid_state_mask = (BIT(RPMH_ACTIVE_ONLY_STATE) |	\
> +					BIT(RPMH_WAKE_ONLY_STATE) |	\
> +					BIT(RPMH_SLEEP_STATE)),		\
> +	};								\
> +	static struct rpmhpd _platform##_##_active = {			\
> +		.pd = { .name = #_active, },				\
> +		.peer = &_platform##_##_name,				\
> +		.active_only = true,					\
> +		.res_name = #_name".lvl",				\
> +		.valid_state_mask = (BIT(RPMH_ACTIVE_ONLY_STATE) |	\
> +					BIT(RPMH_WAKE_ONLY_STATE) |	\
> +					BIT(RPMH_SLEEP_STATE)),		\
> +	}
> +
> +#define DEFINE_RPMHPD(_platform, _name)					\
> +	static struct rpmhpd _platform##_##_name = {			\
> +		.pd = { .name = #_name, },				\
> +		.res_name = #_name".lvl",				\
> +		.valid_state_mask = BIT(RPMH_ACTIVE_ONLY_STATE),	\
> +	}
> +
> +/*
> + * This is the number of bytes used for each command DB aux data entry of an
> + * ARC resource.
> + */
> +#define RPMH_ARC_LEVEL_SIZE	2
> +#define RPMH_ARC_MAX_LEVELS	16
> +
> +struct rpmhpd {
> +	struct device	*dev;
> +	struct generic_pm_domain pd;
> +	struct rpmhpd	*peer;
> +	const bool	active_only;
> +	unsigned int	corner;
> +	unsigned int	active_corner;
> +	u32		level[RPMH_ARC_MAX_LEVELS];
> +	int		level_count;
> +	bool		enabled;
> +	const char	*res_name;
> +	u32		addr;
> +	u8		valid_state_mask;
> +};
> +
> +struct rpmhpd_desc {
> +	struct rpmhpd **rpmhpds;
> +	size_t num_pds;
> +};
> +
> +static DEFINE_MUTEX(rpmhpd_lock);
> +
> +/* sdm845 RPMh Power domains */
> +DEFINE_RPMHPD(sdm845, ebi);
> +DEFINE_RPMHPD_AO(sdm845, mx, mx_ao);
> +DEFINE_RPMHPD_AO(sdm845, cx, cx_ao);
> +DEFINE_RPMHPD(sdm845, lmx);
> +DEFINE_RPMHPD(sdm845, lcx);
> +DEFINE_RPMHPD(sdm845, gfx);
> +DEFINE_RPMHPD(sdm845, mss);
> +
> +static struct rpmhpd *sdm845_rpmhpds[] = {
> +	[SDM845_EBI] = &sdm845_ebi,
> +	[SDM845_MX] = &sdm845_mx,
> +	[SDM845_MX_AO] = &sdm845_mx_ao,
> +	[SDM845_CX] = &sdm845_cx,
> +	[SDM845_CX_AO] = &sdm845_cx_ao,
> +	[SDM845_LMX] = &sdm845_lmx,
> +	[SDM845_LCX] = &sdm845_lcx,
> +	[SDM845_GFX] = &sdm845_gfx,
> +	[SDM845_MSS] = &sdm845_mss,
> +};
> +
> +static const struct rpmhpd_desc sdm845_desc = {
> +	.rpmhpds = sdm845_rpmhpds,
> +	.num_pds = ARRAY_SIZE(sdm845_rpmhpds),
> +};
> +
> +static const struct of_device_id rpmhpd_match_table[] = {
> +	{ .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, rpmhpd_match_table);
> +
> +static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
> +			      unsigned int corner, bool sync)
> +{
> +	struct tcs_cmd cmd = {
> +		.addr = pd->addr,
> +		.data = corner,
> +	};
> +
> +	if (sync)
> +		return rpmh_write(pd->dev, state, &cmd, 1);
> +	else
> +		return rpmh_write_async(pd->dev, state, &cmd, 1);
> +}
> +
> +static int rpmhpd_send_corner_sync(struct rpmhpd *pd, int state,
> +				   unsigned int corner)
> +{
> +	return rpmhpd_send_corner(pd, state, corner, true);
> +}
> +
> +static int rpmhpd_send_corner_async(struct rpmhpd *pd, int state,
> +				    unsigned int corner)
> +{
> +	return rpmhpd_send_corner(pd, state, corner, false);
> +};
> +
> +static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
> +			    unsigned int *active, unsigned int *sleep)
> +{
> +	*active = corner;
> +
> +	if (pd->active_only)
> +		*sleep = 0;
> +	else
> +		*sleep = *active;
> +}
> +
> +/*
> + * This function is used to aggregate the votes across the active only
> + * resources and its peers. The aggregated votes are send to RPMh as
> + * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
> + * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
> + * on system sleep).
> + * We send ACTIVE_ONLY votes for resources without any peers. For others,
> + * which have an active only peer, all 3 Votes are sent.
> + */
> +static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
> +{
> +	int ret = -EINVAL;
> +	struct rpmhpd *peer = pd->peer;
> +	unsigned int active_corner, sleep_corner;
> +	unsigned int this_active_corner = 0, this_sleep_corner = 0;
> +	unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
> +
> +	to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
> +
> +	if (peer && peer->enabled)
> +		to_active_sleep(peer, peer->corner, &peer_active_corner,
> +				&peer_sleep_corner);
> +
> +	active_corner = max(this_active_corner, peer_active_corner);
> +
> +	if (pd->valid_state_mask & BIT(RPMH_ACTIVE_ONLY_STATE)) {
> +		/*
> +		 * Wait for an ack only when we are increasing the
> +		 * perf state of the power domain
> +		 */
> +		if (active_corner > pd->active_corner)
> +			ret = rpmhpd_send_corner_sync(pd,
> +						      RPMH_ACTIVE_ONLY_STATE,
> +						      active_corner);
> +		else
> +			ret = rpmhpd_send_corner_async(pd,
> +						       RPMH_ACTIVE_ONLY_STATE,
> +						       active_corner);
> +		if (ret)
> +			return ret;
> +		pd->active_corner = active_corner;
> +		if (peer)
> +			peer->active_corner = active_corner;
> +	}
> +
> +	if (pd->valid_state_mask & BIT(RPMH_WAKE_ONLY_STATE)) {
> +		ret = rpmhpd_send_corner_async(pd, RPMH_WAKE_ONLY_STATE,
> +					       active_corner);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	sleep_corner = max(this_sleep_corner, peer_sleep_corner);
> +
> +	if (pd->valid_state_mask & BIT(RPMH_SLEEP_STATE))
> +		ret = rpmhpd_send_corner_async(pd, RPMH_SLEEP_STATE,
> +					       sleep_corner);
> +
> +	return ret;
> +}
> +
> +static int rpmhpd_power_on(struct generic_pm_domain *domain)
> +{
> +	struct rpmhpd *pd = domain_to_rpmhpd(domain);
> +	int ret = 0;
> +
> +	mutex_lock(&rpmhpd_lock);
> +
> +	pd->enabled = true;
> +
> +	if (pd->corner)
> +		ret = rpmhpd_aggregate_corner(pd, pd->corner);
> +
> +	mutex_unlock(&rpmhpd_lock);
> +
> +	return ret;
> +}
> +
> +static int rpmhpd_power_off(struct generic_pm_domain *domain)
> +{
> +	struct rpmhpd *pd = domain_to_rpmhpd(domain);
> +	int ret = 0;
> +
> +	mutex_lock(&rpmhpd_lock);
> +
> +	if (pd->level[0] == 0)
> +		ret = rpmhpd_aggregate_corner(pd, 0);
> +
> +	if (!ret)
> +		pd->enabled = false;
> +
> +	mutex_unlock(&rpmhpd_lock);
> +
> +	return ret;
> +}
> +
> +static int rpmhpd_set_performance(struct generic_pm_domain *domain,
> +				  unsigned int state)
> +{
> +	struct rpmhpd *pd = domain_to_rpmhpd(domain);
> +	int ret = 0, i;
> +
> +	mutex_lock(&rpmhpd_lock);
> +
> +	for (i = 0; i < pd->level_count; i++)
> +		if (state <= pd->level[i])
> +			break;
> +
> +	if (i == pd->level_count) {
> +		ret = -EINVAL;
> +		dev_err(pd->dev, "invalid state=%u for domain %s",
> +			state, pd->pd.name);
> +			goto out;
> +	}
> +
> +	pd->corner = i;
> +
> +	if (!pd->enabled)
> +		goto out;
> +
> +	ret = rpmhpd_aggregate_corner(pd, i);
> +out:
> +	mutex_unlock(&rpmhpd_lock);
> +
> +	return ret;
> +}
> +
> +static unsigned int rpmhpd_get_performance(struct generic_pm_domain *genpd,
> +					   struct dev_pm_opp *opp)
> +{
> +	struct device_node *np;
> +	unsigned int corner = 0;
> +
> +	np = dev_pm_opp_get_of_node(opp);
> +	if (of_property_read_u32(np, "qcom,level", &corner)) {
> +		pr_err("%s: missing 'qcom,level' property\n", __func__);
> +		return 0;
> +	}
> +
> +	of_node_put(np);
> +
> +	return corner;
> +}
> +
> +static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
> +{
> +	int i, j, len, ret;
> +	u8 buf[RPMH_ARC_MAX_LEVELS * RPMH_ARC_LEVEL_SIZE];
> +
> +	len = cmd_db_read_aux_data_len(rpmhpd->res_name);
> +	if (len <= 0)
> +		return len;
> +
> +	if (len > RPMH_ARC_MAX_LEVELS * RPMH_ARC_LEVEL_SIZE)
> +		return -EINVAL;
> +
> +	ret = cmd_db_read_aux_data(rpmhpd->res_name, buf, len);
> +	if (ret < 0)
> +		return ret;
> +
> +	rpmhpd->level_count = len / RPMH_ARC_LEVEL_SIZE;
> +
> +	for (i = 0; i < rpmhpd->level_count; i++) {
> +		rpmhpd->level[i] = 0;
> +		for (j = 0; j < RPMH_ARC_LEVEL_SIZE; j++)
> +			rpmhpd->level[i] |=
> +				buf[i * RPMH_ARC_LEVEL_SIZE + j] << (8 * j);
> +
> +		/*
> +		 * The AUX data may be zero padded.  These 0 valued entries at
> +		 * the end of the map must be ignored.
> +		 */
> +		if (i > 0 && rpmhpd->level[i] == 0) {
> +			rpmhpd->level_count = i;
> +			break;
> +		}
> +		pr_dbg("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
> +		       rpmhpd->level[i]);
> +	}
> +
> +	return 0;
> +}
> +
> +static int rpmhpd_probe(struct platform_device *pdev)
> +{
> +	int i, ret;
> +	size_t num;
> +	struct genpd_onecell_data *data;
> +	struct rpmhpd **rpmhpds;
> +	const struct rpmhpd_desc *desc;
> +
> +	desc = of_device_get_match_data(&pdev->dev);
> +	if (!desc)
> +		return -EINVAL;
> +
> +	rpmhpds = desc->rpmhpds;
> +	num = desc->num_pds;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
> +				     GFP_KERNEL);
> +	data->num_domains = num;
> +
> +	ret = cmd_db_ready();
> +	if (ret) {
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "Command DB unavailable, ret=%d\n",
> +				ret);
> +		return ret;
> +	}
> +
> +	for (i = 0; i < num; i++) {
> +		if (!rpmhpds[i]) {
> +			dev_warn(&pdev->dev, "rpmhpds[] with empty entry at index=%d\n",
> +				 i);
> +			continue;
> +		}
> +
> +		rpmhpds[i]->dev = &pdev->dev;
> +		rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
> +		if (!rpmhpds[i]->addr) {
> +			dev_err(&pdev->dev, "Could not find RPMh address for resource %s\n",
> +				rpmhpds[i]->res_name);
> +			return -ENODEV;
> +		}
> +
> +		ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
> +		if (ret != CMD_DB_HW_ARC) {
> +			dev_err(&pdev->dev, "RPMh slave ID mismatch\n");
> +			return -EINVAL;
> +		}
> +
> +		ret = rpmhpd_update_level_mapping(rpmhpds[i]);
> +		if (ret)
> +			return ret;
> +
> +		rpmhpds[i]->pd.power_off = rpmhpd_power_off;
> +		rpmhpds[i]->pd.power_on = rpmhpd_power_on;
> +		rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance;
> +		rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance;
> +		pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
> +
> +		data->domains[i] = &rpmhpds[i]->pd;
> +	}
> +
> +	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
> +}
> +
> +static int rpmhpd_remove(struct platform_device *pdev)
> +{
> +	of_genpd_del_provider(pdev->dev.of_node);
> +	return 0;
> +}
> +
> +static struct platform_driver rpmhpd_driver = {
> +	.driver = {
> +		.name = "qcom-rpmhpd",
> +		.of_match_table = rpmhpd_match_table,
> +	},
> +	.probe = rpmhpd_probe,
> +	.remove = rpmhpd_remove,
> +};
> +
> +static int __init rpmhpd_init(void)
> +{
> +	return platform_driver_register(&rpmhpd_driver);
> +}
> +core_initcall(rpmhpd_init);
> +
> +static void __exit rpmhpd_exit(void)
> +{
> +	platform_driver_unregister(&rpmhpd_driver);
> +}
> +module_exit(rpmhpd_exit);
> +
> +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. RPMh Power Domain Driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:qcom-rpmhpd");
> diff --git a/include/dt-bindings/power/qcom-rpmhpd.h b/include/dt-bindings/power/qcom-rpmhpd.h
> new file mode 100644
> index 000000000000..b01ae2452603
> --- /dev/null
> +++ b/include/dt-bindings/power/qcom-rpmhpd.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2018, The Linux Foundation. All rights reserved. */
> +
> +#ifndef _DT_BINDINGS_POWER_QCOM_RPMHPD_H
> +#define _DT_BINDINGS_POWER_QCOM_RPMHPD_H
> +
> +/* SDM845 Power Domain Indexes */
> +#define SDM845_EBI	0
> +#define SDM845_MX	1
> +#define SDM845_MX_AO	2
> +#define SDM845_CX	3
> +#define SDM845_CX_AO	4
> +#define SDM845_LMX	5
> +#define SDM845_LCX	6
> +#define SDM845_GFX	7
> +#define SDM845_MSS	8
> +
> +/* SDM845 Power Domain performance levels */
> +#define RPMH_REGULATOR_LEVEL_OFF	0
> +#define RPMH_REGULATOR_LEVEL_RETENTION	16
> +#define RPMH_REGULATOR_LEVEL_MIN_SVS	48
> +#define RPMH_REGULATOR_LEVEL_LOW_SVS	64
> +#define RPMH_REGULATOR_LEVEL_SVS	128
> +#define RPMH_REGULATOR_LEVEL_SVS_L1	192
> +#define RPMH_REGULATOR_LEVEL_NOM	256
> +#define RPMH_REGULATOR_LEVEL_NOM_L1	320
> +#define RPMH_REGULATOR_LEVEL_NOM_L2	336
> +#define RPMH_REGULATOR_LEVEL_TURBO	384
> +#define RPMH_REGULATOR_LEVEL_TURBO_L1	416
> +
> +#endif
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> 
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