[U-Boot,7/9] power domain: add Tegra186 driver

From: Stephen Warren <swarren@nvidia.com>

In Tegra186, SoC power domains are manipulated using IPC requests to
the BPMP (Boot and Power Management Processor). This change implements a
driver that does that.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
 drivers/power/domain/Kconfig                 |  7 +++
 drivers/power/domain/Makefile                |  1 +
 drivers/power/domain/tegra186-power-domain.c | 88 ++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 drivers/power/domain/tegra186-power-domain.c

Hi Stephen,

On 27 July 2016 at 15:24, Stephen Warren <swarren@wwwdotorg.org> wrote:
> From: Stephen Warren <swarren@nvidia.com>
>
> In Tegra186, SoC power domains are manipulated using IPC requests to
> the BPMP (Boot and Power Management Processor). This change implements a
> driver that does that.
>
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
>  drivers/power/domain/Kconfig                 |  7 +++
>  drivers/power/domain/Makefile                |  1 +
>  drivers/power/domain/tegra186-power-domain.c | 88 ++++++++++++++++++++++++++++
>  3 files changed, 96 insertions(+)
>  create mode 100644 drivers/power/domain/tegra186-power-domain.c
>
> diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
> index b90409743398..132e33250e8c 100644
> --- a/drivers/power/domain/Kconfig
> +++ b/drivers/power/domain/Kconfig
> @@ -17,4 +17,11 @@ config SANDBOX_POWER_DOMAIN
>           simply accepts requests to power on/off various HW modules without
>           actually doing anything beyond a little error checking.
>
> +config TEGRA186_POWER_DOMAIN
> +       bool "Enable Tegra186 BPMP-based power domain driver"
> +       depends on TEGRA186_BPMP
> +       help
> +         Enable support for manipulating Tegra's on-SoC power domains via IPC
> +         requests to the BPMP (Boot and Power Management Processor).
> +
>  endmenu
> diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
> index c18292f0ec88..2c3d92638fbe 100644
> --- a/drivers/power/domain/Makefile
> +++ b/drivers/power/domain/Makefile
> @@ -5,3 +5,4 @@
>  obj-$(CONFIG_POWER_DOMAIN) += power-domain-uclass.o
>  obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
>  obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
> +obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
> diff --git a/drivers/power/domain/tegra186-power-domain.c b/drivers/power/domain/tegra186-power-domain.c
> new file mode 100644
> index 000000000000..4ae4baabe57e
> --- /dev/null
> +++ b/drivers/power/domain/tegra186-power-domain.c
> @@ -0,0 +1,88 @@
> +/*
> + * Copyright (c) 2016, NVIDIA CORPORATION.
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <power-domain-uclass.h>
> +#include <asm/arch-tegra/bpmp_abi.h>
> +#include <asm/arch-tegra/tegra186_bpmp.h>
> +
> +#define UPDATE BIT(0)
> +#define ON     BIT(1)
> +
> +static int tegra186_power_domain_request(struct power_domain *power_domain)
> +{
> +       debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
> +             power_domain, power_domain->dev, power_domain->id);
> +
> +       return 0;
> +}
> +
> +static int tegra186_power_domain_free(struct power_domain *power_domain)
> +{
> +       debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
> +             power_domain, power_domain->dev, power_domain->id);
> +
> +       return 0;
> +}
> +
> +static int tegra186_power_domain_common(struct power_domain *power_domain,
> +                                       bool on)
> +{
> +       struct mrq_pg_update_state_request req;
> +       int on_state = on ? ON : 0;
> +
> +       req.partition_id = power_domain->id;
> +       req.logic_state = UPDATE | on_state;
> +       req.sram_state = UPDATE | on_state;
> +       /*
> +        * Drivers manage their own clocks so they don't get out of sync, and
> +        * since some power domains have many clocks, only a subset of which
> +        * are actually needed depending on use-case.
> +        */
> +       req.clock_state = UPDATE;
> +
> +       return tegra186_bpmp_call(power_domain->dev->parent,
> +                                 MRQ_PG_UPDATE_STATE, &req, sizeof(req), NULL,
> +                                 0);

Again I wonder if this can use UCLASS_MISC?

> +}
> +
> +static int tegra186_power_domain_on(struct power_domain *power_domain)
> +{
> +       debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
> +             power_domain, power_domain->dev, power_domain->id);
> +
> +       return tegra186_power_domain_common(power_domain, true);
> +}
> +
> +static int tegra186_power_domain_off(struct power_domain *power_domain)
> +{
> +       debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
> +             power_domain, power_domain->dev, power_domain->id);
> +
> +       return tegra186_power_domain_common(power_domain, false);
> +}
> +
> +struct power_domain_ops tegra186_power_domain_ops = {
> +       .request = tegra186_power_domain_request,
> +       .free = tegra186_power_domain_free,
> +       .on = tegra186_power_domain_on,
> +       .off = tegra186_power_domain_off,
> +};
> +
> +static int tegra186_power_domain_probe(struct udevice *dev)
> +{
> +       debug("%s(dev=%p)\n", __func__, dev);
> +
> +       return 0;
> +}
> +
> +U_BOOT_DRIVER(tegra186_power_domain) = {
> +       .name = "tegra186_power_domain",
> +       .id = UCLASS_POWER_DOMAIN,
> +       .probe = tegra186_power_domain_probe,
> +       .ops = &tegra186_power_domain_ops,
> +};
> --
> 2.9.2
>

Regards,
Simon