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[88.20.62.90]) by smtp.gmail.com with ESMTPSA id a16sm32596863wrx.8.2020.06.17.01.32.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2020 01:32:38 -0700 (PDT) From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= To: p.zabel@pengutronix.de, robh+dt@kernel.org, tsbogend@alpha.franken.de, f.fainelli@gmail.com, jonas.gorski@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com Cc: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= , Florian Fainelli Subject: [PATCH v6 3/9] reset: add BCM6345 reset controller driver Date: Wed, 17 Jun 2020 10:32:25 +0200 Message-Id: <20200617083231.3699090-4-noltari@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200617083231.3699090-1-noltari@gmail.com> References: <20200617083231.3699090-1-noltari@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for resetting blocks through the Linux reset controller subsystem for BCM63xx SoCs. Signed-off-by: Álvaro Fernández Rojas Reviewed-by: Florian Fainelli --- v6: driver improvements: - use devm_platform_ioremap_resource. - simplify bcm6345_reset_probe return. - introduce and use to_bcm6345_reset function. v5: fix kbuild robot error (drop __init). v4: no changes. v3: using reset-simple isn't possible since sleeping after performing the reset is also needed. v2: add compatibility to reset-simple instead of adding a new driver. drivers/reset/Kconfig | 7 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-bcm6345.c | 132 ++++++++++++++++++++++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 drivers/reset/reset-bcm6345.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index d9efbfd29646..9f1da978cef6 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -41,6 +41,13 @@ config RESET_BERLIN help This enables the reset controller driver for Marvell Berlin SoCs. +config RESET_BCM6345 + bool "BCM6345 Reset Controller" + depends on BMIPS_GENERIC || COMPILE_TEST + default BMIPS_GENERIC + help + This enables the reset controller driver for BCM6345 SoCs. + config RESET_BRCMSTB tristate "Broadcom STB reset controller" depends on ARCH_BRCMSTB || COMPILE_TEST diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 249ed357c997..e642aae42f0f 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra/ obj-$(CONFIG_RESET_A10SR) += reset-a10sr.o obj-$(CONFIG_RESET_ATH79) += reset-ath79.o obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o +obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o diff --git a/drivers/reset/reset-bcm6345.c b/drivers/reset/reset-bcm6345.c new file mode 100644 index 000000000000..3eedea226028 --- /dev/null +++ b/drivers/reset/reset-bcm6345.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * BCM6345 Reset Controller Driver + * + * Copyright (C) 2020 Álvaro Fernández Rojas + */ + +#include +#include +#include +#include +#include +#include + +#define BCM6345_RESET_NUM 32 +#define BCM6345_RESET_SLEEP_MIN_US 10000 +#define BCM6345_RESET_SLEEP_MAX_US 20000 + +struct bcm6345_reset { + struct reset_controller_dev rcdev; + void __iomem *base; + spinlock_t lock; +}; + +static inline struct bcm6345_reset * +to_bcm6345_reset(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct bcm6345_reset, rcdev); +} + +static void bcm6345_reset_update(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + struct bcm6345_reset *bcm6345_reset = to_bcm6345_reset(rcdev); + unsigned long flags; + uint32_t val; + + spin_lock_irqsave(&bcm6345_reset->lock, flags); + val = __raw_readl(bcm6345_reset->base); + if (assert) + val &= ~BIT(id); + else + val |= BIT(id); + __raw_writel(val, bcm6345_reset->base); + spin_unlock_irqrestore(&bcm6345_reset->lock, flags); +} + +static int bcm6345_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + bcm6345_reset_update(rcdev, id, true); + + return 0; +} + +static int bcm6345_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + bcm6345_reset_update(rcdev, id, false); + + return 0; +} + +static int bcm6345_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + bcm6345_reset_update(rcdev, id, true); + usleep_range(BCM6345_RESET_SLEEP_MIN_US, + BCM6345_RESET_SLEEP_MAX_US); + + bcm6345_reset_update(rcdev, id, false); + usleep_range(BCM6345_RESET_SLEEP_MIN_US, + BCM6345_RESET_SLEEP_MAX_US); + + return 0; +} + +static int bcm6345_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct bcm6345_reset *bcm6345_reset = to_bcm6345_reset(rcdev); + + return !(__raw_readl(bcm6345_reset->base) & BIT(id)); +} + +static struct reset_control_ops bcm6345_reset_ops = { + .assert = bcm6345_reset_assert, + .deassert = bcm6345_reset_deassert, + .reset = bcm6345_reset_reset, + .status = bcm6345_reset_status, +}; + +static int bcm6345_reset_probe(struct platform_device *pdev) +{ + struct bcm6345_reset *bcm6345_reset; + + bcm6345_reset = devm_kzalloc(&pdev->dev, + sizeof(*bcm6345_reset), GFP_KERNEL); + if (!bcm6345_reset) + return -ENOMEM; + + platform_set_drvdata(pdev, bcm6345_reset); + + bcm6345_reset->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(bcm6345_reset->base)) + return PTR_ERR(bcm6345_reset->base); + + spin_lock_init(&bcm6345_reset->lock); + bcm6345_reset->rcdev.ops = &bcm6345_reset_ops; + bcm6345_reset->rcdev.owner = THIS_MODULE; + bcm6345_reset->rcdev.of_node = pdev->dev.of_node; + bcm6345_reset->rcdev.of_reset_n_cells = 1; + bcm6345_reset->rcdev.nr_resets = BCM6345_RESET_NUM; + + return devm_reset_controller_register(&pdev->dev, + &bcm6345_reset->rcdev); +} + +static const struct of_device_id bcm6345_reset_of_match[] = { + { .compatible = "brcm,bcm6345-reset" }, + { /* sentinel */ }, +}; + +static struct platform_driver bcm6345_reset_driver = { + .probe = bcm6345_reset_probe, + .driver = { + .name = "bcm6345-reset", + .of_match_table = bcm6345_reset_of_match, + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver(bcm6345_reset_driver); -- 2.27.0