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Message-ID: <20180828002236.GX160295@google.com>
Date: Mon, 27 Aug 2018 17:22:36 -0700
From: Matthias Kaehlcke <mka@...omium.org>
To: Sibi Sankar <sibis@...eaurora.org>
Cc: bjorn.andersson@...aro.org, p.zabel@...gutronix.de,
robh+dt@...nel.org, linux-remoteproc@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
ohad@...ery.com, mark.rutland@....com, sricharan@...eaurora.org,
akdwived@...eaurora.org, linux-arm-msm@...r.kernel.org,
tsoni@...eaurora.org
Subject: Re: [PATCH v2 2/6] reset: qcom: PDC Global (Power Domain Controller)
reset controller
Hi Sibi,
On Fri, Aug 24, 2018 at 06:48:56PM +0530, Sibi Sankar wrote:
> Add reset controller for SDM845 SoCs to control reset signals provided
> by PDC Global for Modem, Compute, Display, GPU, Debug, AOP, Sensors,
> Audio, SP and APPS
>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---
> drivers/reset/Kconfig | 9 +++
> drivers/reset/Makefile | 1 +
> drivers/reset/reset-qcom-pdc.c | 142 +++++++++++++++++++++++++++++++++
> 3 files changed, 152 insertions(+)
> create mode 100644 drivers/reset/reset-qcom-pdc.c
>
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 13d28fdbdbb5..c21da9fe51ec 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -98,6 +98,15 @@ config RESET_QCOM_AOSS
> reset signals provided by AOSS for Modem, Venus, ADSP,
> GPU, Camera, Wireless, Display subsystem. Otherwise, say N.
>
> +config RESET_QCOM_PDC
> + tristate "Qualcomm PDC Reset Driver"
> + depends on ARCH_QCOM || COMPILE_TEST
> + help
> + This enables the PDC (Power Domain Controller) reset driver
> + for Qualcomm Technologies Inc SDM845 SoCs. Say Y if you want
> + to control reset signals provided by PDC for Modem, Compute,
> + Display, GPU, Debug, AOP, Sensors, Audio, SP and APPS.
What exactly does APPS mean? The AP cores, the entire SoC, something
else?
> +
> config RESET_SIMPLE
> bool "Simple Reset Controller Driver" if COMPILE_TEST
> default ARCH_SOCFPGA || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARCH_ASPEED
> diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> index 4243c38228e2..d08e8b90046a 100644
> --- a/drivers/reset/Makefile
> +++ b/drivers/reset/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
> obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
> obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
> obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o
> +obj-$(CONFIG_RESET_QCOM_PDC) += reset-qcom-pdc.o
> obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
> obj-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
> obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
> diff --git a/drivers/reset/reset-qcom-pdc.c b/drivers/reset/reset-qcom-pdc.c
> new file mode 100644
> index 000000000000..bb6a5e5ee0f8
> --- /dev/null
> +++ b/drivers/reset/reset-qcom-pdc.c
> @@ -0,0 +1,142 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> +#include <linux/regmap.h>
> +#include <linux/of_device.h>
> +#include <dt-bindings/reset/qcom,sdm845-pdc.h>
Headers should be sorted in alphabetical order.
> +
> +#define RPMH_PDC_SYNC_RESET 0x100
> +
> +struct qcom_pdc_reset_map {
> + u8 bit;
> +};
> +
> +struct qcom_pdc_desc {
> + const struct regmap_config *config;
> + const struct qcom_pdc_reset_map *resets;
> + size_t num_resets;
> +};
Not sure if this structure adds much value or just a layer of
indirection:
- .config is only accessed in _probe(), sdm845_pdc_regmap_config could
be used directly
- .resets is used in _(de)assert(), sdm845_pdc_resets could be used
directly
- .num_resets is only accessed in _probe(),
ARRAY_SIZE(sdm845_pdc_resets) could be used instead
It probably makes sense if it is planned to support reset controllers
of other SoCs with this driver.
> +struct qcom_pdc_reset_data {
> + struct reset_controller_dev rcdev;
> + struct regmap *regmap;
> + const struct qcom_pdc_desc *desc;
> +};
> +
> +static const struct regmap_config sdm845_pdc_regmap_config = {
> + .name = "pdc-reset",
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = 0x20000,
> + .fast_io = true,
> +};
> +
> +static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = {
> + [PDC_APPS_SYNC_RESET] = {0},
> + [PDC_SP_SYNC_RESET] = {1},
> + [PDC_AUDIO_SYNC_RESET] = {2},
> + [PDC_SENSORS_SYNC_RESET] = {3},
> + [PDC_AOP_SYNC_RESET] = {4},
> + [PDC_DEBUG_SYNC_RESET] = {5},
> + [PDC_GPU_SYNC_RESET] = {6},
> + [PDC_DISPLAY_SYNC_RESET] = {7},
> + [PDC_COMPUTE_SYNC_RESET] = {8},
> + [PDC_MODEM_SYNC_RESET] = {9},
> +};
> +
> +static const struct qcom_pdc_desc sdm845_pdc_desc = {
> + .config = &sdm845_pdc_regmap_config,
> + .resets = sdm845_pdc_resets,
> + .num_resets = ARRAY_SIZE(sdm845_pdc_resets),
> +};
> +
> +static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
> + struct reset_controller_dev *rcdev)
> +{
> + return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
> +}
> +
> +static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
> + unsigned long idx)
> +{
> + struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
> + const struct qcom_pdc_reset_map *map = &data->desc->resets[idx];
> +
> + return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
> + BIT(map->bit), BIT(map->bit));
> +}
> +
> +static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
> + unsigned long idx)
> +{
> + struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
> + const struct qcom_pdc_reset_map *map = &data->desc->resets[idx];
> +
> + return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
> + BIT(map->bit), 0);
> +}
> +
> +static const struct reset_control_ops qcom_pdc_reset_ops = {
> + .assert = qcom_pdc_control_assert,
> + .deassert = qcom_pdc_control_deassert,
> +};
> +
> +static int qcom_pdc_reset_probe(struct platform_device *pdev)
> +{
> + struct qcom_pdc_reset_data *data;
> + struct device *dev = &pdev->dev;
> + const struct qcom_pdc_desc *desc;
> + void __iomem *base;
> + struct resource *res;
> +
> + desc = of_device_get_match_data(dev);
> + if (!desc)
> + return -EINVAL;
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + data->desc = desc;
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + data->regmap = devm_regmap_init_mmio(dev, base, desc->config);
> + if (IS_ERR(data->regmap)) {
> + dev_err(dev, "Unable to get pdc-global regmap");
Add missing '\n'
Say 'pdc-reset' instead of 'pdc-global'? (see also my other comment
below).
> + return PTR_ERR(data->regmap);
> + }
> +
> + data->rcdev.owner = THIS_MODULE;
> + data->rcdev.ops = &qcom_pdc_reset_ops;
> + data->rcdev.nr_resets = desc->num_resets;
> + data->rcdev.of_node = dev->of_node;
> +
> + return devm_reset_controller_register(dev, &data->rcdev);
> +}
> +
> +static const struct of_device_id qcom_pdc_reset_of_match[] = {
> + { .compatible = "qcom,sdm845-pdc-global", .data = &sdm845_pdc_desc },
Should this be 'qcom,sdm845-pdc-reset' which is more specific than
'global' and in line with the name and purpose of the driver?
Obviously this would require to adjust the bindings doc too.
Cheers
Matthias
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