From: <Conor.Dooley@microchip.com>
To: <p.zabel@pengutronix.de>
Cc: <paul.walmsley@sifive.com>, <Daire.McNamara@microchip.com>,
<sboyd@kernel.org>, <aou@eecs.berkeley.edu>, <robh+dt@kernel.org>,
<palmer@dabbelt.com>, <linux-clk@vger.kernel.org>,
<devicetree@vger.kernel.org>, <mturquette@baylibre.com>,
<linux-kernel@vger.kernel.org>, <linux-riscv@lists.infradead.org>,
<krzysztof.kozlowski+dt@linaro.org>
Subject: Re: [PATCH v2 03/12] reset: add polarfire soc reset support
Date: Mon, 18 Jul 2022 11:34:22 +0000 [thread overview]
Message-ID: <22d3a11b-a603-8406-77ec-51ec038560fc@microchip.com> (raw)
In-Reply-To: <20220704121558.2088698-4-conor.dooley@microchip.com>
On 04/07/2022 13:15, Conor Dooley wrote:
> Add support for the resets on Microchip's PolarFire SoC (MPFS).
> Reset control is a single register, wedged in between registers for
> clock control. To fit with existed DT etc, the reset controller is
> created using the aux device framework & set up in the clock driver.
Hey Philipp,
I resolved your comments on V1. Do you have any remaining concerns?
Thanks,
Conor.
>
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---
> drivers/reset/Kconfig | 7 ++
> drivers/reset/Makefile | 2 +-
> drivers/reset/reset-mpfs.c | 157 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 165 insertions(+), 1 deletion(-)
> create mode 100644 drivers/reset/reset-mpfs.c
>
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 93c8d07ee328..edfdc7b2bc5f 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -122,6 +122,13 @@ config RESET_MCHP_SPARX5
> help
> This driver supports switch core reset for the Microchip Sparx5 SoC.
>
> +config RESET_POLARFIRE_SOC
> + bool "Microchip PolarFire SoC (MPFS) Reset Driver"
> + depends on AUXILIARY_BUS && MCHP_CLK_MPFS
> + default MCHP_CLK_MPFS
> + help
> + This driver supports peripheral reset for the Microchip PolarFire SoC
> +
> config RESET_MESON
> tristate "Meson Reset Driver"
> depends on ARCH_MESON || COMPILE_TEST
> diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> index a80a9c4008a7..5fac3a753858 100644
> --- a/drivers/reset/Makefile
> +++ b/drivers/reset/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_RESET_K210) += reset-k210.o
> obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o
> obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
> obj-$(CONFIG_RESET_MCHP_SPARX5) += reset-microchip-sparx5.o
> +obj-$(CONFIG_RESET_POLARFIRE_SOC) += reset-mpfs.o
> obj-$(CONFIG_RESET_MESON) += reset-meson.o
> obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
> obj-$(CONFIG_RESET_NPCM) += reset-npcm.o
> @@ -38,4 +39,3 @@ obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
> obj-$(CONFIG_RESET_UNIPHIER_GLUE) += reset-uniphier-glue.o
> obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o
> obj-$(CONFIG_ARCH_ZYNQMP) += reset-zynqmp.o
> -
> diff --git a/drivers/reset/reset-mpfs.c b/drivers/reset/reset-mpfs.c
> new file mode 100644
> index 000000000000..1580d1b68d61
> --- /dev/null
> +++ b/drivers/reset/reset-mpfs.c
> @@ -0,0 +1,157 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * PolarFire SoC (MPFS) Peripheral Clock Reset Controller
> + *
> + * Author: Conor Dooley <conor.dooley@microchip.com>
> + * Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
> + *
> + */
> +#include <linux/auxiliary_bus.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> +#include <dt-bindings/clock/microchip,mpfs-clock.h>
> +#include <soc/microchip/mpfs.h>
> +
> +/*
> + * The ENVM reset is the lowest bit in the register & I am using the CLK_FOO
> + * defines in the dt to make things easier to configure - so this is accounting
> + * for the offset of 3 there.
> + */
> +#define MPFS_PERIPH_OFFSET CLK_ENVM
> +#define MPFS_NUM_RESETS 30u
> +#define MPFS_SLEEP_MIN_US 100
> +#define MPFS_SLEEP_MAX_US 200
> +
> +/* block concurrent access to the soft reset register */
> +static DEFINE_SPINLOCK(mpfs_reset_lock);
> +
> +/*
> + * Peripheral clock resets
> + */
> +
> +static int mpfs_assert(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + unsigned long flags;
> + u32 reg;
> +
> + spin_lock_irqsave(&mpfs_reset_lock, flags);
> +
> + reg = mpfs_reset_read(rcdev->dev);
> + reg |= BIT(id);
> + mpfs_reset_write(rcdev->dev, reg);
> +
> + spin_unlock_irqrestore(&mpfs_reset_lock, flags);
> +
> + return 0;
> +}
> +
> +static int mpfs_deassert(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + unsigned long flags;
> + u32 reg, val;
> +
> + spin_lock_irqsave(&mpfs_reset_lock, flags);
> +
> + reg = mpfs_reset_read(rcdev->dev);
> + val = reg & ~BIT(id);
> + mpfs_reset_write(rcdev->dev, val);
> +
> + spin_unlock_irqrestore(&mpfs_reset_lock, flags);
> +
> + return 0;
> +}
> +
> +static int mpfs_status(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + u32 reg = mpfs_reset_read(rcdev->dev);
> +
> + /*
> + * It is safe to return here as MPFS_NUM_RESETS makes sure the sign bit
> + * is never hit.
> + */
> + return (reg & BIT(id));
> +}
> +
> +static int mpfs_reset(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + mpfs_assert(rcdev, id);
> +
> + usleep_range(MPFS_SLEEP_MIN_US, MPFS_SLEEP_MAX_US);
> +
> + mpfs_deassert(rcdev, id);
> +
> + return 0;
> +}
> +
> +static const struct reset_control_ops mpfs_reset_ops = {
> + .reset = mpfs_reset,
> + .assert = mpfs_assert,
> + .deassert = mpfs_deassert,
> + .status = mpfs_status,
> +};
> +
> +static int mpfs_reset_xlate(struct reset_controller_dev *rcdev,
> + const struct of_phandle_args *reset_spec)
> +{
> + unsigned int index = reset_spec->args[0];
> +
> + /*
> + * CLK_RESERVED does not map to a clock, but it does map to a reset,
> + * so it has to be accounted for here. It is the reset for the fabric,
> + * so if this reset gets called - do not reset it.
> + */
> + if (index == CLK_RESERVED) {
> + dev_err(rcdev->dev, "Resetting the fabric is not supported\n");
> + return -EINVAL;
> + }
> +
> + if (index < MPFS_PERIPH_OFFSET || index >= (MPFS_PERIPH_OFFSET + rcdev->nr_resets)) {
> + dev_err(rcdev->dev, "Invalid reset index %u\n", index);
> + return -EINVAL;
> + }
> +
> + return index - MPFS_PERIPH_OFFSET;
> +}
> +
> +static int mpfs_reset_probe(struct auxiliary_device *adev,
> + const struct auxiliary_device_id *id)
> +{
> + struct device *dev = &adev->dev;
> + struct reset_controller_dev *rcdev;
> +
> + rcdev = devm_kzalloc(dev, sizeof(*rcdev), GFP_KERNEL);
> + if (!rcdev)
> + return -ENOMEM;
> +
> + rcdev->dev = dev;
> + rcdev->dev->parent = dev->parent;
> + rcdev->ops = &mpfs_reset_ops;
> + rcdev->of_node = dev->parent->of_node;
> + rcdev->of_reset_n_cells = 1;
> + rcdev->of_xlate = mpfs_reset_xlate;
> + rcdev->nr_resets = MPFS_NUM_RESETS;
> +
> + return devm_reset_controller_register(dev, rcdev);
> +}
> +
> +static const struct auxiliary_device_id mpfs_reset_ids[] = {
> + {
> + .name = "clk_mpfs.reset-mpfs",
> + },
> + { }
> +};
> +MODULE_DEVICE_TABLE(auxiliary, mpfs_reset_ids);
> +
> +static struct auxiliary_driver mpfs_reset_driver = {
> + .probe = mpfs_reset_probe,
> + .id_table = mpfs_reset_ids,
> +};
> +
> +module_auxiliary_driver(mpfs_reset_driver);
> +
> +MODULE_DESCRIPTION("Microchip PolarFire SoC Reset Driver");
> +MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(MCHP_CLK_MPFS);
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2022-07-18 11:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-04 12:15 [PATCH v2 00/12] PolarFire SoC reset controller & clock cleanups Conor Dooley
2022-07-04 12:15 ` [PATCH v2 01/12] dt-bindings: clk: microchip: mpfs: add reset controller support Conor Dooley
2022-07-04 12:15 ` [PATCH v2 02/12] clk: microchip: mpfs: add reset controller Conor Dooley
2022-07-04 12:15 ` [PATCH v2 03/12] reset: add polarfire soc reset support Conor Dooley
2022-07-18 11:34 ` Conor.Dooley [this message]
2022-07-18 15:42 ` Philipp Zabel
2022-07-18 15:44 ` Conor.Dooley
2022-07-04 12:15 ` [PATCH v2 04/12] MAINTAINERS: add polarfire soc reset controller Conor Dooley
2022-07-04 12:15 ` [PATCH v2 05/12] riscv: dts: microchip: add mpfs specific macb reset support Conor Dooley
2022-07-04 12:15 ` [PATCH v2 06/12] clk: microchip: mpfs: add module_authors entries Conor Dooley
2022-07-04 12:15 ` [PATCH v2 07/12] clk: microchip: mpfs: add MSS pll's set & round rate Conor Dooley
2022-07-04 12:15 ` [PATCH v2 08/12] clk: microchip: mpfs: move id & offset out of clock structs Conor Dooley
2022-07-04 12:15 ` [PATCH v2 09/12] clk: microchip: mpfs: simplify control reg access Conor Dooley
2022-07-04 12:15 ` [PATCH v2 10/12] clk: microchip: mpfs: delete 2 line mpfs_clk_register_foo() Conor Dooley
2022-07-04 12:15 ` [PATCH v2 11/12] clk: microchip: mpfs: convert cfg_clk to clk_divider Conor Dooley
2022-07-04 12:15 ` [PATCH v2 12/12] clk: microchip: mpfs: convert periph_clk to clk_gate Conor Dooley
2022-07-20 13:46 ` [PATCH v2 00/12] PolarFire SoC reset controller & clock cleanups Conor.Dooley
2022-08-09 23:05 ` Conor.Dooley
2022-08-10 18:56 ` Nathan Chancellor
2022-08-10 19:20 ` Conor.Dooley
2022-08-10 19:32 ` Nathan Chancellor
2022-08-10 19:43 ` Conor.Dooley
2022-08-11 13:13 ` Conor.Dooley
2022-08-14 11:41 ` Conor.Dooley
2022-08-17 12:17 ` Conor.Dooley
2022-08-17 16:18 ` Nathan Chancellor
2022-08-10 11:50 ` Daire.McNamara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=22d3a11b-a603-8406-77ec-51ec038560fc@microchip.com \
--to=conor.dooley@microchip.com \
--cc=Daire.McNamara@microchip.com \
--cc=aou@eecs.berkeley.edu \
--cc=devicetree@vger.kernel.org \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=mturquette@baylibre.com \
--cc=p.zabel@pengutronix.de \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=robh+dt@kernel.org \
--cc=sboyd@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).