On 29 March 2017 at 18:34, Thierry Reding <thierry.reding@xxxxxxxxx> wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> The BPMP firmware, found on Tegra186 and later, provides an ABI that can
> be used to enable and disable power to several power partitions in Tegra
> SoCs. The ABI allows for enumeration of the available power partitions,
> so the driver can be reused on future generations, provided the BPMP ABI
> remains stable.
>
> Based on work by Stefan Kristiansson <stefank@xxxxxxxxxx> and Mikko
> Perttunen <mperttunen@xxxxxxxxxx>.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Kind regards
Uffe
> ---
> Changes in v2:
> - take into account PG_STATE_RUNNING in tegra_bpmp_powergate_is_powered()
> - check return value of pm_genpd_init() and clean up on failure
> - simplify error unwinding in tegra_bpmp_init_powergates()
>
> drivers/firmware/tegra/bpmp.c | 4 +
> drivers/soc/tegra/Kconfig | 5 +
> drivers/soc/tegra/Makefile | 1 +
> drivers/soc/tegra/powergate-bpmp.c | 359 +++++++++++++++++++++++++++++++++++++
> include/soc/tegra/bpmp.h | 12 ++
> 5 files changed, 381 insertions(+)
> create mode 100644 drivers/soc/tegra/powergate-bpmp.c
>
> diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
> index 84e4c9a58a0c..f11c7025b4a1 100644
> --- a/drivers/firmware/tegra/bpmp.c
> +++ b/drivers/firmware/tegra/bpmp.c
> @@ -810,6 +810,10 @@ static int tegra_bpmp_probe(struct platform_device *pdev)
> if (err < 0)
> goto free_mrq;
>
> + err = tegra_bpmp_init_powergates(bpmp);
> + if (err < 0)
> + goto free_mrq;
> +
> platform_set_drvdata(pdev, bpmp);
>
> return 0;
> diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
> index 208d6edb3fdb..e052664439a1 100644
> --- a/drivers/soc/tegra/Kconfig
> +++ b/drivers/soc/tegra/Kconfig
> @@ -106,3 +106,8 @@ config SOC_TEGRA_PMC
>
> config SOC_TEGRA_PMC_TEGRA186
> bool
> +
> +config SOC_TEGRA_POWERGATE_BPMP
> + def_bool y
> + depends on PM_GENERIC_DOMAINS
> + depends on TEGRA_BPMP
> diff --git a/drivers/soc/tegra/Makefile b/drivers/soc/tegra/Makefile
> index b4425e4319ff..17f2e25e7954 100644
> --- a/drivers/soc/tegra/Makefile
> +++ b/drivers/soc/tegra/Makefile
> @@ -3,3 +3,4 @@ obj-y += fuse/
> obj-y += common.o
> obj-$(CONFIG_SOC_TEGRA_PMC) += pmc.o
> obj-$(CONFIG_SOC_TEGRA_PMC_TEGRA186) += pmc-tegra186.o
> +obj-$(CONFIG_SOC_TEGRA_POWERGATE_BPMP) += powergate-bpmp.o
> diff --git a/drivers/soc/tegra/powergate-bpmp.c b/drivers/soc/tegra/powergate-bpmp.c
> new file mode 100644
> index 000000000000..8fc356039401
> --- /dev/null
> +++ b/drivers/soc/tegra/powergate-bpmp.c
> @@ -0,0 +1,359 @@
> +/*
> + * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/slab.h>
> +#include <linux/version.h>
> +
> +#include <soc/tegra/bpmp.h>
> +#include <soc/tegra/bpmp-abi.h>
> +
> +struct tegra_powergate_info {
> + unsigned int id;
> + char *name;
> +};
> +
> +struct tegra_powergate {
> + struct generic_pm_domain genpd;
> + struct tegra_bpmp *bpmp;
> + unsigned int id;
> +};
> +
> +static inline struct tegra_powergate *
> +to_tegra_powergate(struct generic_pm_domain *genpd)
> +{
> + return container_of(genpd, struct tegra_powergate, genpd);
> +}
> +
> +static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp,
> + unsigned int id, u32 state)
> +{
> + struct mrq_pg_request request;
> + struct tegra_bpmp_message msg;
> +
> + memset(&request, 0, sizeof(request));
> + request.cmd = CMD_PG_SET_STATE;
> + request.id = id;
> + request.set_state.state = state;
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.mrq = MRQ_PG;
> + msg.tx.data = &request;
> + msg.tx.size = sizeof(request);
> +
> + return tegra_bpmp_transfer(bpmp, &msg);
> +}
> +
> +static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp,
> + unsigned int id)
> +{
> + struct mrq_pg_response response;
> + struct mrq_pg_request request;
> + struct tegra_bpmp_message msg;
> + int err;
> +
> + memset(&request, 0, sizeof(request));
> + request.cmd = CMD_PG_GET_STATE;
> + request.id = id;
> +
> + memset(&response, 0, sizeof(response));
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.mrq = MRQ_PG;
> + msg.tx.data = &request;
> + msg.tx.size = sizeof(request);
> + msg.rx.data = &response;
> + msg.rx.size = sizeof(response);
> +
> + err = tegra_bpmp_transfer(bpmp, &msg);
> + if (err < 0)
> + return PG_STATE_OFF;
> +
> + return response.get_state.state;
> +}
> +
> +static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp)
> +{
> + struct mrq_pg_response response;
> + struct mrq_pg_request request;
> + struct tegra_bpmp_message msg;
> + int err;
> +
> + memset(&request, 0, sizeof(request));
> + request.cmd = CMD_PG_GET_MAX_ID;
> +
> + memset(&response, 0, sizeof(response));
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.mrq = MRQ_PG;
> + msg.tx.data = &request;
> + msg.tx.size = sizeof(request);
> + msg.rx.data = &response;
> + msg.rx.size = sizeof(response);
> +
> + err = tegra_bpmp_transfer(bpmp, &msg);
> + if (err < 0)
> + return err;
> +
> + return response.get_max_id.max_id;
> +}
> +
> +static char *tegra_bpmp_powergate_get_name(struct tegra_bpmp *bpmp,
> + unsigned int id)
> +{
> + struct mrq_pg_response response;
> + struct mrq_pg_request request;
> + struct tegra_bpmp_message msg;
> + int err;
> +
> + memset(&request, 0, sizeof(request));
> + request.cmd = CMD_PG_GET_NAME;
> + request.id = id;
> +
> + memset(&response, 0, sizeof(response));
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.mrq = MRQ_PG;
> + msg.tx.data = &request;
> + msg.tx.size = sizeof(request);
> + msg.rx.data = &response;
> + msg.rx.size = sizeof(response);
> +
> + err = tegra_bpmp_transfer(bpmp, &msg);
> + if (err < 0)
> + return NULL;
> +
> + return kstrdup(response.get_name.name, GFP_KERNEL);
> +}
> +
> +static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp,
> + unsigned int id)
> +{
> + return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF;
> +}
> +
> +static int tegra_powergate_power_on(struct generic_pm_domain *domain)
> +{
> + struct tegra_powergate *powergate = to_tegra_powergate(domain);
> + struct tegra_bpmp *bpmp = powergate->bpmp;
> +
> + return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
> + PG_STATE_ON);
> +}
> +
> +static int tegra_powergate_power_off(struct generic_pm_domain *domain)
> +{
> + struct tegra_powergate *powergate = to_tegra_powergate(domain);
> + struct tegra_bpmp *bpmp = powergate->bpmp;
> +
> + return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
> + PG_STATE_OFF);
> +}
> +
> +static struct tegra_powergate *
> +tegra_powergate_add(struct tegra_bpmp *bpmp,
> + const struct tegra_powergate_info *info)
> +{
> + struct tegra_powergate *powergate;
> + bool off;
> + int err;
> +
> + off = !tegra_bpmp_powergate_is_powered(bpmp, info->id);
> +
> + powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL);
> + if (!powergate)
> + return ERR_PTR(-ENOMEM);
> +
> + powergate->id = info->id;
> + powergate->bpmp = bpmp;
> +
> + powergate->genpd.name = kstrdup(info->name, GFP_KERNEL);
> + powergate->genpd.power_on = tegra_powergate_power_on;
> + powergate->genpd.power_off = tegra_powergate_power_off;
> +
> + err = pm_genpd_init(&powergate->genpd, NULL, off);
> + if (err < 0) {
> + kfree(powergate->genpd.name);
> + return ERR_PTR(err);
> + }
> +
> + return powergate;
> +}
> +
> +static void tegra_powergate_remove(struct tegra_powergate *powergate)
> +{
> + struct generic_pm_domain *genpd = &powergate->genpd;
> + struct tegra_bpmp *bpmp = powergate->bpmp;
> + int err;
> +
> + err = pm_genpd_remove(genpd);
> + if (err < 0)
> + dev_err(bpmp->dev, "failed to remove power domain %s: %d\n",
> + genpd->name, err);
> +
> + kfree(genpd->name);
> +}
> +
> +static int
> +tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp,
> + struct tegra_powergate_info **powergatesp)
> +{
> + struct tegra_powergate_info *powergates;
> + unsigned int max_id, id, count = 0;
> + unsigned int num_holes = 0;
> + int err;
> +
> + err = tegra_bpmp_powergate_get_max_id(bpmp);
> + if (err < 0)
> + return err;
> +
> + max_id = err;
> +
> + dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id);
> +
> + powergates = kcalloc(max_id + 1, sizeof(*powergates), GFP_KERNEL);
> + if (!powergates)
> + return -ENOMEM;
> +
> + for (id = 0; id <= max_id; id++) {
> + struct tegra_powergate_info *info = &powergates[count];
> +
> + info->name = tegra_bpmp_powergate_get_name(bpmp, id);
> + if (!info->name || info->name[0] == '\0') {
> + num_holes++;
> + continue;
> + }
> +
> + info->id = id;
> + count++;
> + }
> +
> + dev_dbg(bpmp->dev, "holes: %u\n", num_holes);
> +
> + *powergatesp = powergates;
> +
> + return count;
> +}
> +
> +static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp,
> + struct tegra_powergate_info *powergates,
> + unsigned int count)
> +{
> + struct genpd_onecell_data *genpd = &bpmp->genpd;
> + struct generic_pm_domain **domains;
> + struct tegra_powergate *powergate;
> + unsigned int i;
> + int err;
> +
> + domains = kcalloc(count, sizeof(*domains), GFP_KERNEL);
> + if (!domains)
> + return -ENOMEM;
> +
> + for (i = 0; i < count; i++) {
> + powergate = tegra_powergate_add(bpmp, &powergates[i]);
> + if (IS_ERR(powergate)) {
> + err = PTR_ERR(powergate);
> + goto remove;
> + }
> +
> + dev_dbg(bpmp->dev, "added power domain %s\n",
> + powergate->genpd.name);
> + domains[i] = &powergate->genpd;
> + }
> +
> + genpd->num_domains = count;
> + genpd->domains = domains;
> +
> + return 0;
> +
> +remove:
> + while (i--) {
> + powergate = to_tegra_powergate(domains[i]);
> + tegra_powergate_remove(powergate);
> + }
> +
> + kfree(genpd->domains);
> + return err;
> +}
> +
> +static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp)
> +{
> + struct genpd_onecell_data *genpd = &bpmp->genpd;
> + unsigned int i = genpd->num_domains;
> + struct tegra_powergate *powergate;
> +
> + while (i--) {
> + dev_dbg(bpmp->dev, "removing power domain %s\n",
> + genpd->domains[i]->name);
> + powergate = to_tegra_powergate(genpd->domains[i]);
> + tegra_powergate_remove(powergate);
> + }
> +}
> +
> +static struct generic_pm_domain *
> +tegra_powergate_xlate(struct of_phandle_args *spec, void *data)
> +{
> + struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
> + struct genpd_onecell_data *genpd = data;
> + unsigned int i;
> +
> + for (i = 0; i < genpd->num_domains; i++) {
> + struct tegra_powergate *powergate;
> +
> + powergate = to_tegra_powergate(genpd->domains[i]);
> + if (powergate->id == spec->args[0]) {
> + domain = &powergate->genpd;
> + break;
> + }
> + }
> +
> + return domain;
> +}
> +
> +int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
> +{
> + struct device_node *np = bpmp->dev->of_node;
> + struct tegra_powergate_info *powergates;
> + struct device *dev = bpmp->dev;
> + unsigned int count, i;
> + int err;
> +
> + err = tegra_bpmp_probe_powergates(bpmp, &powergates);
> + if (err < 0)
> + return err;
> +
> + count = err;
> +
> + dev_dbg(dev, "%u power domains probed\n", count);
> +
> + err = tegra_bpmp_add_powergates(bpmp, powergates, count);
> + if (err < 0)
> + goto free;
> +
> + bpmp->genpd.xlate = tegra_powergate_xlate;
> +
> + err = of_genpd_add_provider_onecell(np, &bpmp->genpd);
> + if (err < 0) {
> + dev_err(dev, "failed to add power domain provider: %d\n", err);
> + tegra_bpmp_remove_powergates(bpmp);
> + }
> +
> +free:
> + for (i = 0; i < count; i++)
> + kfree(powergates[i].name);
> +
> + kfree(powergates);
> + return err;
> +}
> diff --git a/include/soc/tegra/bpmp.h b/include/soc/tegra/bpmp.h
> index 13dcd44e91bb..9ba65222bd3f 100644
> --- a/include/soc/tegra/bpmp.h
> +++ b/include/soc/tegra/bpmp.h
> @@ -15,6 +15,7 @@
> #define __SOC_TEGRA_BPMP_H
>
> #include <linux/mailbox_client.h>
> +#include <linux/pm_domain.h>
> #include <linux/reset-controller.h>
> #include <linux/semaphore.h>
> #include <linux/types.h>
> @@ -91,6 +92,8 @@ struct tegra_bpmp {
> unsigned int num_clocks;
>
> struct reset_controller_dev rstc;
> +
> + struct genpd_onecell_data genpd;
> };
>
> struct tegra_bpmp *tegra_bpmp_get(struct device *dev);
> @@ -138,4 +141,13 @@ static inline int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
> }
> #endif
>
> +#if IS_ENABLED(CONFIG_SOC_TEGRA_POWERGATE_BPMP)
> +int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp);
> +#else
> +static inline int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
> +{
> + return 0;
> +}
> +#endif
> +
> #endif /* __SOC_TEGRA_BPMP_H */
> --
> 2.12.0
>
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