diff options
Diffstat (limited to 'target/linux/generic/pending-5.15/852-clk-bcm-Add-BCM63268-timer-clock-and-reset-driver.patch')
| -rw-r--r-- | target/linux/generic/pending-5.15/852-clk-bcm-Add-BCM63268-timer-clock-and-reset-driver.patch | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.15/852-clk-bcm-Add-BCM63268-timer-clock-and-reset-driver.patch b/target/linux/generic/pending-5.15/852-clk-bcm-Add-BCM63268-timer-clock-and-reset-driver.patch new file mode 100644 index 0000000000..7e500cd1b5 --- /dev/null +++ b/target/linux/generic/pending-5.15/852-clk-bcm-Add-BCM63268-timer-clock-and-reset-driver.patch @@ -0,0 +1,345 @@ +From patchwork Wed Mar 22 17:15:15 2023 +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 8bit +X-Patchwork-Submitter: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= + <noltari@gmail.com> +X-Patchwork-Id: 13184392 +Return-Path: <linux-clk-owner@vger.kernel.org> +X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on + aws-us-west-2-korg-lkml-1.web.codeaurora.org +Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) + by smtp.lore.kernel.org (Postfix) with ESMTP id 199D9C76196 + for <linux-clk@archiver.kernel.org>; Wed, 22 Mar 2023 17:16:11 +0000 (UTC) +Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand + id S231512AbjCVRQJ (ORCPT <rfc822;linux-clk@archiver.kernel.org>); 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+ Wed, 22 Mar 2023 10:15:25 -0700 (PDT) +Received: from atlantis.lan (255.red-79-146-124.dynamicip.rima-tde.net. + [79.146.124.255]) + by smtp.gmail.com with ESMTPSA id + v10-20020a05600c470a00b003ee11ac2288sm8414333wmo.21.2023.03.22.10.15.24 + (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); + Wed, 22 Mar 2023 10:15:25 -0700 (PDT) +From: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= <noltari@gmail.com> +To: mturquette@baylibre.com, sboyd@kernel.org, robh+dt@kernel.org, + krzysztof.kozlowski+dt@linaro.org, p.zabel@pengutronix.de, + f.fainelli@gmail.com, jonas.gorski@gmail.com, + william.zhang@broadcom.com, linux-clk@vger.kernel.org, + devicetree@vger.kernel.org, linux-kernel@vger.kernel.org +Cc: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= <noltari@gmail.com> +Subject: [PATCH v4 4/4] clk: bcm: Add BCM63268 timer clock and reset driver +Date: Wed, 22 Mar 2023 18:15:15 +0100 +Message-Id: <20230322171515.120353-5-noltari@gmail.com> +X-Mailer: git-send-email 2.30.2 +In-Reply-To: <20230322171515.120353-1-noltari@gmail.com> +References: <20230322171515.120353-1-noltari@gmail.com> +MIME-Version: 1.0 +Precedence: bulk +List-ID: <linux-clk.vger.kernel.org> +X-Mailing-List: linux-clk@vger.kernel.org + +Add driver for BCM63268 timer clock and reset controller. + +Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> +--- + v4: add changes suggested by Stephen Boyd: + - Usage of of_device_get_match_data() isn't needed. + - Use devm_clk_hw_register_gate(). + - Drop clk_hw_unregister_gate(). + v3: add missing <linux/io.h> include to fix build warning + v2: add changes suggested by Stephen Boyd + + drivers/clk/bcm/Kconfig | 9 ++ + drivers/clk/bcm/Makefile | 1 + + drivers/clk/bcm/clk-bcm63268-timer.c | 215 +++++++++++++++++++++++++++ + 3 files changed, 225 insertions(+) + create mode 100644 drivers/clk/bcm/clk-bcm63268-timer.c + +--- a/drivers/clk/bcm/Kconfig ++++ b/drivers/clk/bcm/Kconfig +@@ -37,6 +37,15 @@ config CLK_BCM_63XX_GATE + Enable common clock framework support for Broadcom BCM63xx DSL SoCs + based on the MIPS architecture + ++config CLK_BCM63268_TIMER ++ bool "Broadcom BCM63268 timer clock and reset support" ++ depends on BMIPS_GENERIC || COMPILE_TEST ++ default BMIPS_GENERIC ++ select RESET_CONTROLLER ++ help ++ Enable timer clock and reset support for Broadcom BCM63268 DSL SoCs ++ based on the MIPS architecture. ++ + config CLK_BCM_KONA + bool "Broadcom Kona CCU clock support" + depends on ARCH_BCM_MOBILE || COMPILE_TEST +--- a/drivers/clk/bcm/Makefile ++++ b/drivers/clk/bcm/Makefile +@@ -1,6 +1,7 @@ + # SPDX-License-Identifier: GPL-2.0 + obj-$(CONFIG_CLK_BCM_63XX) += clk-bcm63xx.o + obj-$(CONFIG_CLK_BCM_63XX_GATE) += clk-bcm63xx-gate.o ++obj-$(CONFIG_CLK_BCM63268_TIMER) += clk-bcm63268-timer.o + obj-$(CONFIG_CLK_BCM_KONA) += clk-kona.o + obj-$(CONFIG_CLK_BCM_KONA) += clk-kona-setup.o + obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm281xx.o +--- /dev/null ++++ b/drivers/clk/bcm/clk-bcm63268-timer.c +@@ -0,0 +1,215 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * BCM63268 Timer Clock and Reset Controller Driver ++ * ++ * Copyright (C) 2023 Álvaro Fernández Rojas <noltari@gmail.com> ++ */ ++ ++#include <linux/clk-provider.h> ++#include <linux/delay.h> ++#include <linux/io.h> ++#include <linux/of.h> ++#include <linux/of_device.h> ++#include <linux/platform_device.h> ++#include <linux/reset-controller.h> ++ ++#include <dt-bindings/clock/bcm63268-clock.h> ++ ++#define BCM63268_TIMER_RESET_SLEEP_MIN_US 10000 ++#define BCM63268_TIMER_RESET_SLEEP_MAX_US 20000 ++ ++struct bcm63268_tclkrst_hw { ++ void __iomem *regs; ++ spinlock_t lock; ++ ++ struct reset_controller_dev rcdev; ++ struct clk_hw_onecell_data data; ++}; ++ ++struct bcm63268_tclk_table_entry { ++ const char * const name; ++ u8 bit; ++}; ++ ++static const struct bcm63268_tclk_table_entry bcm63268_timer_clocks[] = { ++ { ++ .name = "ephy1", ++ .bit = BCM63268_TCLK_EPHY1, ++ }, { ++ .name = "ephy2", ++ .bit = BCM63268_TCLK_EPHY2, ++ }, { ++ .name = "ephy3", ++ .bit = BCM63268_TCLK_EPHY3, ++ }, { ++ .name = "gphy1", ++ .bit = BCM63268_TCLK_GPHY1, ++ }, { ++ .name = "dsl", ++ .bit = BCM63268_TCLK_DSL, ++ }, { ++ .name = "wakeon_ephy", ++ .bit = BCM63268_TCLK_WAKEON_EPHY, ++ }, { ++ .name = "wakeon_dsl", ++ .bit = BCM63268_TCLK_WAKEON_DSL, ++ }, { ++ .name = "fap1_pll", ++ .bit = BCM63268_TCLK_FAP1, ++ }, { ++ .name = "fap2_pll", ++ .bit = BCM63268_TCLK_FAP2, ++ }, { ++ .name = "uto_50", ++ .bit = BCM63268_TCLK_UTO_50, ++ }, { ++ .name = "uto_extin", ++ .bit = BCM63268_TCLK_UTO_EXTIN, ++ }, { ++ .name = "usb_ref", ++ .bit = BCM63268_TCLK_USB_REF, ++ }, { ++ /* sentinel */ ++ } ++}; ++ ++static inline struct bcm63268_tclkrst_hw * ++to_bcm63268_timer_reset(struct reset_controller_dev *rcdev) ++{ ++ return container_of(rcdev, struct bcm63268_tclkrst_hw, rcdev); ++} ++ ++static int bcm63268_timer_reset_update(struct reset_controller_dev *rcdev, ++ unsigned long id, bool assert) ++{ ++ struct bcm63268_tclkrst_hw *reset = to_bcm63268_timer_reset(rcdev); ++ unsigned long flags; ++ uint32_t val; ++ ++ spin_lock_irqsave(&reset->lock, flags); ++ val = __raw_readl(reset->regs); ++ if (assert) ++ val &= ~BIT(id); ++ else ++ val |= BIT(id); ++ __raw_writel(val, reset->regs); ++ spin_unlock_irqrestore(&reset->lock, flags); ++ ++ return 0; ++} ++ ++static int bcm63268_timer_reset_assert(struct reset_controller_dev *rcdev, ++ unsigned long id) ++{ ++ return bcm63268_timer_reset_update(rcdev, id, true); ++} ++ ++static int bcm63268_timer_reset_deassert(struct reset_controller_dev *rcdev, ++ unsigned long id) ++{ ++ return bcm63268_timer_reset_update(rcdev, id, false); ++} ++ ++static int bcm63268_timer_reset_reset(struct reset_controller_dev *rcdev, ++ unsigned long id) ++{ ++ bcm63268_timer_reset_update(rcdev, id, true); ++ usleep_range(BCM63268_TIMER_RESET_SLEEP_MIN_US, ++ BCM63268_TIMER_RESET_SLEEP_MAX_US); ++ ++ bcm63268_timer_reset_update(rcdev, id, false); ++ /* ++ * Ensure component is taken out reset state by sleeping also after ++ * deasserting the reset. Otherwise, the component may not be ready ++ * for operation. ++ */ ++ usleep_range(BCM63268_TIMER_RESET_SLEEP_MIN_US, ++ BCM63268_TIMER_RESET_SLEEP_MAX_US); ++ ++ return 0; ++} ++ ++static int bcm63268_timer_reset_status(struct reset_controller_dev *rcdev, ++ unsigned long id) ++{ ++ struct bcm63268_tclkrst_hw *reset = to_bcm63268_timer_reset(rcdev); ++ ++ return !(__raw_readl(reset->regs) & BIT(id)); ++} ++ ++static struct reset_control_ops bcm63268_timer_reset_ops = { ++ .assert = bcm63268_timer_reset_assert, ++ .deassert = bcm63268_timer_reset_deassert, ++ .reset = bcm63268_timer_reset_reset, ++ .status = bcm63268_timer_reset_status, ++}; ++ ++static int bcm63268_tclk_probe(struct platform_device *pdev) ++{ ++ struct device *dev = &pdev->dev; ++ const struct bcm63268_tclk_table_entry *entry; ++ struct bcm63268_tclkrst_hw *hw; ++ struct clk_hw *clk; ++ u8 maxbit = 0; ++ int i, ret; ++ ++ for (entry = bcm63268_timer_clocks; entry->name; entry++) ++ maxbit = max(maxbit, entry->bit); ++ maxbit++; ++ ++ hw = devm_kzalloc(&pdev->dev, struct_size(hw, data.hws, maxbit), ++ GFP_KERNEL); ++ if (!hw) ++ return -ENOMEM; ++ ++ platform_set_drvdata(pdev, hw); ++ ++ spin_lock_init(&hw->lock); ++ ++ hw->data.num = maxbit; ++ for (i = 0; i < maxbit; i++) ++ hw->data.hws[i] = ERR_PTR(-ENODEV); ++ ++ hw->regs = devm_platform_ioremap_resource(pdev, 0); ++ if (IS_ERR(hw->regs)) ++ return PTR_ERR(hw->regs); ++ ++ for (entry = bcm63268_timer_clocks; entry->name; entry++) { ++ clk = devm_clk_hw_register_gate(dev, entry->name, NULL, 0, ++ hw->regs, entry->bit, ++ CLK_GATE_BIG_ENDIAN, ++ &hw->lock); ++ if (IS_ERR(clk)) ++ return PTR_ERR(clk); ++ ++ hw->data.hws[entry->bit] = clk; ++ } ++ ++ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, ++ &hw->data); ++ if (ret) ++ return ret; ++ ++ hw->rcdev.of_node = dev->of_node; ++ hw->rcdev.ops = &bcm63268_timer_reset_ops; ++ ++ ret = devm_reset_controller_register(dev, &hw->rcdev); ++ if (ret) ++ dev_err(dev, "Failed to register reset controller\n"); ++ ++ return 0; ++} ++ ++static const struct of_device_id bcm63268_tclk_dt_ids[] = { ++ { .compatible = "brcm,bcm63268-timer-clocks" }, ++ { /* sentinel */ } ++}; ++ ++static struct platform_driver bcm63268_tclk = { ++ .probe = bcm63268_tclk_probe, ++ .driver = { ++ .name = "bcm63268-timer-clock", ++ .of_match_table = bcm63268_tclk_dt_ids, ++ }, ++}; ++builtin_platform_driver(bcm63268_tclk); |