From patchwork Thu Sep 2 23:42:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Holland X-Patchwork-Id: 506812 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B186C433F5 for ; Thu, 2 Sep 2021 23:42:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A0C8610E9 for ; Thu, 2 Sep 2021 23:42:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346850AbhIBXnb (ORCPT ); Thu, 2 Sep 2021 19:43:31 -0400 Received: from wnew1-smtp.messagingengine.com ([64.147.123.26]:60003 "EHLO wnew1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346276AbhIBXna (ORCPT ); Thu, 2 Sep 2021 19:43:30 -0400 Received: from compute6.internal (compute6.nyi.internal [10.202.2.46]) by mailnew.west.internal (Postfix) with ESMTP id E683C2B006E9; Thu, 2 Sep 2021 19:42:30 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute6.internal (MEProxy); Thu, 02 Sep 2021 19:42:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sholland.org; h= from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; s=fm3; bh=fqnnQ1mT7IKeUBNRXAaLi2gjg5 OvGtbLCaioyw+wFps=; b=coycE8AWLtqpoIJAbk5IFV5eTJ1CgPhT2DlDYzlGOn 5RirMUKBDb7+x1APv778s2mpChS2AUGMTsF1BeZGfWDl6rIC373KyNv2v4/6HOWv IbDs1B30/kPpM2h7FXQh54yeV8HYwt/KBuHFV1DUKcci80m2yKEGqBtngv5fyt+Q D5EGnWWkqsI4B5k/qMS0WGbj7ZclD0ol2qwlsq71+Pmj3906C8Ik3l0E5qBIWLEX 9hNrezQ6Ry/OKiJhgFBLZU20oze//MMzd5BkGMWe2Ocw7NtXRdkZJsMOOlX5eSHu 8/iUndzziDnJTlsbJ7RA8jgnO6lpq6/Jq7IMUPfhEpGA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :message-id:mime-version:subject:to:x-me-proxy:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm3; bh=fqnnQ1mT7IKeUBNRX AaLi2gjg5OvGtbLCaioyw+wFps=; b=TVQz/P3X9YN1RzDFFUAfwkQbC8AVexJzZ EAji+q5+lHhZeqqfoBME7fD7uYxR0IgN9aJay7bTnaS4t8GlrhDJSXYjZC3krUkA grhcP8SdL8ZCeLlJyuAjL0hO8laFux3jW0FuFes9kq2shaFRxJWGVHN/Fu01vf6X NgHCPz4pElWQRYgf6iA+7ha1IwJeAKg1lz1SD74W0EKQNa4Sq4eKIU5LuPRLQLLG y9ngUPP0OXdHKbzfaL0reXrfsNoamFWocxYivYDNu/k7dRI+Lqwpu2cwEVfJzyLI MpSqa6DzIa2v61Igg+ryUxnkEYsICy8mlU1/411M5w5kk0xBxnHqg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvtddruddviedgvdeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffoggfgsedtkeertdertddtnecuhfhrohhmpefurghmuhgvlhcu jfholhhlrghnugcuoehsrghmuhgvlhesshhhohhllhgrnhgurdhorhhgqeenucggtffrrg htthgvrhhnpeegffdtvdevgfeljeduveefgfefffejhfdtudeiudejueehtdelgefgjeeu ffduueenucffohhmrghinhepuggvvhhitggvthhrvggvrdhorhhgnecuvehluhhsthgvrh fuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepshgrmhhuvghlsehshhholhhl rghnugdrohhrgh X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 2 Sep 2021 19:42:29 -0400 (EDT) From: Samuel Holland To: Pavel Machek , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec Cc: Icenowy Zheng , devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, Samuel Holland Subject: [PATCH 1/2] dt-bindings: leds: Add Allwinner R329/D1 LED controller Date: Thu, 2 Sep 2021 18:42:27 -0500 Message-Id: <20210902234228.32223-1-samuel@sholland.org> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org The Allwinner R329 and D1 SoCs contain an LED controller designed to drive a series of RGB LED pixels. It supports PIO and DMA transfers, and has configurable timing and pixel format. Signed-off-by: Samuel Holland --- .../leds/allwinner,sun50i-r329-ledc.yaml | 141 ++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml diff --git a/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml b/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml new file mode 100644 index 000000000000..bf883944e911 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml @@ -0,0 +1,141 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/allwinner,sun50i-r329-ledc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Allwinner sunxi LED Controller Bindings + +maintainers: + - Samuel Holland + +description: + The LED controller found in Allwinner sunxi SoCs uses a one-wire serial + interface to drive up to 1024 RGB LEDs. + +properties: + compatible: + oneOf: + - const: allwinner,sun50i-r329-ledc + - items: + - enum: + - allwinner,sun20i-d1-ledc + - const: allwinner,sun50i-r329-ledc + + reg: + maxItems: 1 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + clocks: + items: + - description: Bus clock + - description: Module clock + + clock-names: + items: + - const: bus + - const: mod + + resets: + maxItems: 1 + + dmas: + items: + - description: TX DMA channel + + dma-names: + items: + - const: tx + + interrupts: + maxItems: 1 + + vled-supply: + description: Regulator supplying power to external LEDs + + format: + description: Pixel format (subpixel transmission order), default is "grb" + enum: + - "bgr" + - "brg" + - "gbr" + - "grb" + - "rbg" + - "rgb" + + t0h-ns: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Length of high pulse when transmitting a "0" bit + + t0l-ns: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Length of low pulse when transmitting a "0" bit + + t1h-ns: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Length of high pulse when transmitting a "1" bit + + t1h-ns: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Length of low pulse when transmitting a "1" bit + + treset-ns: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Minimum delay between transmission frames + +patternProperties: + "^multi-led@[0-9a-f]+$": + type: object + $ref: leds-class-multicolor.yaml# + properties: + reg: + minimum: 0 + maximum: 1023 + description: Index of the LED in the series (must be contiguous) + + required: + - reg + +required: + - compatible + - reg + - clocks + - clock-names + - resets + - dmas + - dma-names + - interrupts + +additionalProperties: false + +examples: + - | + #include + #include + + ledc: led-controller@2008000 { + compatible = "allwinner,sun20i-d1-ledc", + "allwinner,sun50i-r329-ledc"; + reg = <0x2008000 0x400>; + #address-cells = <1>; + #size-cells = <0>; + clocks = <&ccu 12>, <&ccu 34>; + clock-names = "bus", "mod"; + resets = <&ccu 12>; + dmas = <&dma 42>; + dma-names = "tx"; + interrupts = <36 IRQ_TYPE_LEVEL_HIGH>; + + multi-led@0 { + reg = <0x0>; + color = ; + function = LED_FUNCTION_INDICATOR; + }; + }; + +... From patchwork Thu Sep 2 23:42:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Samuel Holland X-Patchwork-Id: 506049 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6E31C433EF for ; Thu, 2 Sep 2021 23:42:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A80D3610F7 for ; Thu, 2 Sep 2021 23:42:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346998AbhIBXnd (ORCPT ); Thu, 2 Sep 2021 19:43:33 -0400 Received: from wnew1-smtp.messagingengine.com ([64.147.123.26]:54819 "EHLO wnew1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346276AbhIBXnd (ORCPT ); Thu, 2 Sep 2021 19:43:33 -0400 Received: from compute2.internal (compute2.nyi.internal [10.202.2.42]) by mailnew.west.internal (Postfix) with ESMTP id 4AE0A2B006F9; Thu, 2 Sep 2021 19:42:33 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Thu, 02 Sep 2021 19:42:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sholland.org; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type:content-transfer-encoding; s=fm3; bh= UFkguadEXvz53o1WnL/XDrKt14tBc/2xQowBDLO4li8=; b=sEBnYse93ZXxGCT0 DgZkHMNvtDE4drs5vHxduVQZMq/H30Ha27o/U5VA1wcQjh+e+3N9vDIW1YCOY++d JrdUQNWPRn+8F3UEIN4KNcr0iW4wZZLZRci5Y20a3U9K48rSOxPjxMLa12fmGNb9 lfonmqgEkxO5y2vXMkkdQiuqSArsOWP+IA9wzGDaZk2ZDzbcM47bDkM4yfUgnUor aHQ54exCO/tb3YgneKv1W1PE7b2eiXaNpq+LBUAOSu1cIOYNuc9jFu7DwwW/wlpE ZaeuB9qzArrydOKDthxf7Jk7vuaqmhZlvgh6AkiLpRR1u65z3Xc1g8QAR2vlDkeE kGoMJQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm3; bh=UFkguadEXvz53o1WnL/XDrKt14tBc/2xQowBDLO4l i8=; b=iDUZyUX+x/9qHRScwTLbI1kQNfimMuY/Ms8NWEPgXtZZqHHfz5ivrStJr 8j9TgIWw3QMI9EWgPKA3B6qm7w2tHl0YFBYOgBnwXQuFbw9WI3Ynu+o1QDZf880y MQ7QFrpu3x47/DjtpFUE5yjcUem2e7sNbsM0gd+PG+6/JI0TCQfs+QwZlyfwPp0R nWC0DlQ8Wm6+VdylOrYISaBJJYqXMvLYSVlt1cd/jYeXIiDGYOghdiZGvC3NCkQN khK+RjDE4KeSVdsEz8qBJRVwsY9Mv/nzy2w2f6iZ7zS/h8da2GOnzuzGT0LepGzF zTQ6mKBITqoNk211xkqqaKLMlWJeA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvtddruddviedgvdeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffojghfgggtgfesthekredtredtjeenucfhrhhomhepufgrmhhu vghlucfjohhllhgrnhguuceoshgrmhhuvghlsehshhholhhlrghnugdrohhrgheqnecugg ftrfgrthhtvghrnhepfedvffetgeduiedtfffgleelvdfhheekkeduffetuddvgeeffedu fefhgeehueejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrh homhepshgrmhhuvghlsehshhholhhlrghnugdrohhrgh X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 2 Sep 2021 19:42:31 -0400 (EDT) From: Samuel Holland To: Pavel Machek , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec Cc: Icenowy Zheng , devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, Samuel Holland Subject: [PATCH 2/2] leds: sunxi: New driver for the R329/D1 LED controller Date: Thu, 2 Sep 2021 18:42:28 -0500 Message-Id: <20210902234228.32223-2-samuel@sholland.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210902234228.32223-1-samuel@sholland.org> References: <20210902234228.32223-1-samuel@sholland.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Some Allwinner sunxi SoCs, starting with the R329, contain an LED controller designed to drive RGB LED pixels. Add a driver for it using the multicolor LED framework, and with LEDs defined in the device tree. Signed-off-by: Samuel Holland Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/leds/Kconfig | 8 + drivers/leds/Makefile | 1 + drivers/leds/leds-sunxi.c | 562 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 571 insertions(+) create mode 100644 drivers/leds/leds-sunxi.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index ed800f5da7d8..559d2ca0a7f4 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -297,6 +297,14 @@ config LEDS_SUNFIRE This option enables support for the Left, Middle, and Right LEDs on the I/O and CPU boards of SunFire UltraSPARC servers. +config LEDS_SUNXI + tristate "LED support for Allwinner sunxi LED controller" + depends on LEDS_CLASS + depends on ARCH_SUNXI || COMPILE_TEST + help + This option enables support for the LED controller provided in + some Allwinner sunxi SoCs. + config LEDS_IPAQ_MICRO tristate "LED Support for the Compaq iPAQ h3xxx" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index c636ec069612..3395f188e5bf 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_LEDS_PWM) += leds-pwm.o obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o +obj-$(CONFIG_LEDS_SUNXI) += leds-sunxi.o obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o diff --git a/drivers/leds/leds-sunxi.c b/drivers/leds/leds-sunxi.c new file mode 100644 index 000000000000..6569d64e0c76 --- /dev/null +++ b/drivers/leds/leds-sunxi.c @@ -0,0 +1,562 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2021 Samuel Holland +// +// Partly based on drivers/leds/leds-turris-omnia.c, which is: +// Copyright (c) 2020 by Marek Behún +// + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LEDC_CTRL_REG 0x0000 +#define LEDC_CTRL_REG_DATA_LENGTH (0x1fff << 16) +#define LEDC_CTRL_REG_RGB_MODE (0x7 << 6) +#define LEDC_CTRL_REG_LEDC_EN BIT(0) +#define LEDC_T01_TIMING_CTRL_REG 0x0004 +#define LEDC_T01_TIMING_CTRL_REG_T1H (0x3f << 21) +#define LEDC_T01_TIMING_CTRL_REG_T1L (0x1f << 16) +#define LEDC_T01_TIMING_CTRL_REG_T0H (0x1f << 6) +#define LEDC_T01_TIMING_CTRL_REG_T0L (0x3f << 0) +#define LEDC_RESET_TIMING_CTRL_REG 0x000c +#define LEDC_RESET_TIMING_CTRL_REG_LED_NUM (0x3ff << 0) +#define LEDC_DATA_REG 0x0014 +#define LEDC_DMA_CTRL_REG 0x0018 +#define LEDC_DMA_CTRL_REG_FIFO_TRIG_LEVEL (0x1f << 0) +#define LEDC_INT_CTRL_REG 0x001c +#define LEDC_INT_CTRL_REG_GLOBAL_INT_EN BIT(5) +#define LEDC_INT_CTRL_REG_FIFO_CPUREQ_INT_EN BIT(1) +#define LEDC_INT_CTRL_REG_TRANS_FINISH_INT_EN BIT(0) +#define LEDC_INT_STS_REG 0x0020 +#define LEDC_INT_STS_REG_FIFO_CPUREQ_INT BIT(1) +#define LEDC_INT_STS_REG_TRANS_FINISH_INT BIT(0) + +#define LEDC_FIFO_DEPTH 32 +#define LEDC_MAX_LEDS 1024 + +#define LEDS_TO_BYTES(n) ((n) * sizeof(u32)) + +struct sunxi_ledc_led { + struct led_classdev_mc mc_cdev; + struct mc_subled subled_info[3]; +}; +#define to_ledc_led(mc) container_of(mc, struct sunxi_ledc_led, mc_cdev) + +struct sunxi_ledc_timing { + u32 t0h_ns; + u32 t0l_ns; + u32 t1h_ns; + u32 t1l_ns; + u32 treset_ns; +}; + +struct sunxi_ledc { + struct device *dev; + void __iomem *base; + struct clk *bus_clk; + struct clk *mod_clk; + struct reset_control *reset; + struct regulator *vled; + + u32 *buffer; + struct dma_chan *dma_chan; + dma_addr_t dma_handle; + int pio_length; + int pio_offset; + + spinlock_t lock; + int next_length; + bool xfer_active; + + u32 format; + struct sunxi_ledc_timing timing; + + int num_leds; + struct sunxi_ledc_led leds[]; +}; + +static int sunxi_ledc_dma_xfer(struct sunxi_ledc *priv, int length) +{ + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + + desc = dmaengine_prep_slave_single(priv->dma_chan, priv->dma_handle, + LEDS_TO_BYTES(length), + DMA_MEM_TO_DEV, 0); + if (!desc) + return -ENOMEM; + + cookie = dmaengine_submit(desc); + if (dma_submit_error(cookie)) + return -EIO; + + dma_async_issue_pending(priv->dma_chan); + + return 0; +} + +static void sunxi_ledc_pio_xfer(struct sunxi_ledc *priv, int length) +{ + u32 burst, offset, val; + + if (length) { + /* New transfer (FIFO is empty). */ + offset = 0; + burst = min(length, LEDC_FIFO_DEPTH); + } else { + /* Existing transfer (FIFO is half-full). */ + length = priv->pio_length; + offset = priv->pio_offset; + burst = min(length, LEDC_FIFO_DEPTH / 2); + } + + writesl(priv->base + LEDC_DATA_REG, priv->buffer + offset, burst); + + if (burst < length) { + priv->pio_length = length - burst; + priv->pio_offset = offset + burst; + + if (!offset) { + val = readl(priv->base + LEDC_INT_CTRL_REG); + val |= LEDC_INT_CTRL_REG_FIFO_CPUREQ_INT_EN; + writel(val, priv->base + LEDC_INT_CTRL_REG); + } + } else { + /* Disable the request IRQ once all data is written. */ + val = readl(priv->base + LEDC_INT_CTRL_REG); + val &= ~LEDC_INT_CTRL_REG_FIFO_CPUREQ_INT_EN; + writel(val, priv->base + LEDC_INT_CTRL_REG); + } +} + +static void sunxi_ledc_start_xfer(struct sunxi_ledc *priv, int length) +{ + u32 val; + + dev_dbg(priv->dev, "Updating %d LEDs\n", length); + + val = readl(priv->base + LEDC_CTRL_REG); + val &= ~LEDC_CTRL_REG_DATA_LENGTH; + val |= length << 16 | LEDC_CTRL_REG_LEDC_EN; + writel(val, priv->base + LEDC_CTRL_REG); + + if (length > LEDC_FIFO_DEPTH) { + int ret = sunxi_ledc_dma_xfer(priv, length); + + if (!ret) + return; + + dev_warn(priv->dev, "Failed to set up DMA: %d\n", ret); + } + + sunxi_ledc_pio_xfer(priv, length); +} + +static irqreturn_t sunxi_ledc_irq(int irq, void *dev_id) +{ + struct sunxi_ledc *priv = dev_id; + u32 val; + + val = readl(priv->base + LEDC_INT_STS_REG); + + if (val & LEDC_INT_STS_REG_TRANS_FINISH_INT) { + int next_length; + + /* Start the next transfer if needed. */ + spin_lock(&priv->lock); + next_length = priv->next_length; + if (next_length) + priv->next_length = 0; + else + priv->xfer_active = false; + spin_unlock(&priv->lock); + + if (next_length) + sunxi_ledc_start_xfer(priv, next_length); + } else if (val & LEDC_INT_STS_REG_FIFO_CPUREQ_INT) { + /* Continue the current transfer. */ + sunxi_ledc_pio_xfer(priv, 0); + } + + writel(val, priv->base + LEDC_INT_STS_REG); + + return IRQ_HANDLED; +} + +static void sunxi_ledc_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct sunxi_ledc *priv = dev_get_drvdata(cdev->dev->parent); + struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev); + struct sunxi_ledc_led *led = to_ledc_led(mc_cdev); + int addr = led - priv->leds; + unsigned long flags; + bool xfer_active; + int next_length; + + led_mc_calc_color_components(mc_cdev, brightness); + + priv->buffer[addr] = led->subled_info[0].brightness << 16 | + led->subled_info[1].brightness << 8 | + led->subled_info[2].brightness; + + dev_dbg(priv->dev, "LED %d -> #%06x\n", addr, priv->buffer[addr]); + + spin_lock_irqsave(&priv->lock, flags); + next_length = max(priv->next_length, addr + 1); + xfer_active = priv->xfer_active; + if (xfer_active) + priv->next_length = next_length; + else + priv->xfer_active = true; + spin_unlock_irqrestore(&priv->lock, flags); + + if (!xfer_active) + sunxi_ledc_start_xfer(priv, next_length); +} + +static const char *const sunxi_ledc_formats[] = { + "rgb", + "rbg", + "grb", + "gbr", + "brg", + "bgr", +}; + +static int sunxi_ledc_parse_format(const struct device_node *np, + struct sunxi_ledc *priv) +{ + const char *format = "grb"; + u32 i; + + of_property_read_string(np, "format", &format); + + for (i = 0; i < ARRAY_SIZE(sunxi_ledc_formats); ++i) { + if (!strcmp(format, sunxi_ledc_formats[i])) { + priv->format = i; + return 0; + } + } + + dev_err(priv->dev, "Bad pixel format '%s'\n", format); + + return -EINVAL; +} + +static void sunxi_ledc_set_format(struct sunxi_ledc *priv) +{ + u32 val; + + val = readl(priv->base + LEDC_CTRL_REG); + val &= ~LEDC_CTRL_REG_RGB_MODE; + val |= priv->format << 6; + writel(val, priv->base + LEDC_CTRL_REG); +} + +static const struct sunxi_ledc_timing sunxi_ledc_default_timing = { + .t0h_ns = 336, + .t0l_ns = 840, + .t1h_ns = 882, + .t1l_ns = 294, + .treset_ns = 300000, +}; + +static int sunxi_ledc_parse_timing(const struct device_node *np, + struct sunxi_ledc *priv) +{ + struct sunxi_ledc_timing *timing = &priv->timing; + + *timing = sunxi_ledc_default_timing; + + of_property_read_u32(np, "t0h-ns", &timing->t0h_ns); + of_property_read_u32(np, "t0l-ns", &timing->t0l_ns); + of_property_read_u32(np, "t1h-ns", &timing->t1h_ns); + of_property_read_u32(np, "t1l-ns", &timing->t1l_ns); + of_property_read_u32(np, "treset-ns", &timing->treset_ns); + + return 0; +} + +static void sunxi_ledc_set_timing(struct sunxi_ledc *priv) +{ + const struct sunxi_ledc_timing *timing = &priv->timing; + unsigned long mod_freq = clk_get_rate(priv->mod_clk); + u32 cycle_ns = NSEC_PER_SEC / mod_freq; + u32 val; + + val = (timing->t1h_ns / cycle_ns) << 21 | + (timing->t1l_ns / cycle_ns) << 16 | + (timing->t0h_ns / cycle_ns) << 6 | + (timing->t0l_ns / cycle_ns); + writel(val, priv->base + LEDC_T01_TIMING_CTRL_REG); + + val = (timing->treset_ns / cycle_ns) << 16 | + (priv->num_leds - 1); + writel(val, priv->base + LEDC_RESET_TIMING_CTRL_REG); +} + +static int sunxi_ledc_resume(struct device *dev) +{ + struct sunxi_ledc *priv = dev_get_drvdata(dev); + u32 val; + int ret; + + ret = regulator_enable(priv->vled); + if (ret) + return ret; + + ret = reset_control_deassert(priv->reset); + if (ret) + goto err_disable_regulator; + + ret = clk_prepare_enable(priv->bus_clk); + if (ret) + goto err_assert_reset; + + ret = clk_prepare_enable(priv->mod_clk); + if (ret) + goto err_disable_bus_clk; + + sunxi_ledc_set_format(priv); + sunxi_ledc_set_timing(priv); + + /* The trigger level must be at least the burst length. */ + val = readl(priv->base + LEDC_DMA_CTRL_REG); + val &= ~LEDC_DMA_CTRL_REG_FIFO_TRIG_LEVEL; + val |= LEDC_FIFO_DEPTH / 2; + writel(val, priv->base + LEDC_DMA_CTRL_REG); + + val = LEDC_INT_CTRL_REG_GLOBAL_INT_EN | + LEDC_INT_CTRL_REG_TRANS_FINISH_INT_EN; + writel(val, priv->base + LEDC_INT_CTRL_REG); + + return 0; + +err_disable_bus_clk: + clk_disable_unprepare(priv->bus_clk); +err_assert_reset: + reset_control_assert(priv->reset); +err_disable_regulator: + regulator_disable(priv->vled); + + return ret; +} + +static int sunxi_ledc_suspend(struct device *dev) +{ + struct sunxi_ledc *priv = dev_get_drvdata(dev); + + clk_disable_unprepare(priv->mod_clk); + clk_disable_unprepare(priv->bus_clk); + reset_control_assert(priv->reset); + regulator_disable(priv->vled); + + return 0; +} + +static void sunxi_ledc_dma_cleanup(void *data) +{ + struct sunxi_ledc *priv = data; + struct device *dma_dev = dmaengine_get_dma_device(priv->dma_chan); + + if (priv->buffer) + dma_free_wc(dma_dev, LEDS_TO_BYTES(priv->num_leds), + priv->buffer, priv->dma_handle); + dma_release_channel(priv->dma_chan); +} + +static int sunxi_ledc_probe(struct platform_device *pdev) +{ + const struct device_node *np = pdev->dev.of_node; + struct dma_slave_config dma_cfg = {}; + struct led_init_data init_data = {}; + struct device *dev = &pdev->dev; + struct device_node *child; + struct sunxi_ledc *priv; + struct resource *mem; + int count, irq, ret; + + count = of_get_available_child_count(np); + if (!count) + return -ENODEV; + if (count > LEDC_MAX_LEDS) { + dev_err(dev, "Too many LEDs! (max is %d)\n", LEDC_MAX_LEDS); + return -EINVAL; + } + + priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->num_leds = count; + spin_lock_init(&priv->lock); + dev_set_drvdata(dev, priv); + + ret = sunxi_ledc_parse_format(np, priv); + if (ret) + return ret; + + ret = sunxi_ledc_parse_timing(np, priv); + if (ret) + return ret; + + priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->bus_clk = devm_clk_get(dev, "bus"); + if (IS_ERR(priv->bus_clk)) + return PTR_ERR(priv->bus_clk); + + priv->mod_clk = devm_clk_get(dev, "mod"); + if (IS_ERR(priv->mod_clk)) + return PTR_ERR(priv->mod_clk); + + priv->reset = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(priv->reset)) + return PTR_ERR(priv->reset); + + priv->vled = devm_regulator_get(dev, "vled"); + if (IS_ERR(priv->vled)) + return PTR_ERR(priv->vled); + + priv->dma_chan = dma_request_chan(dev, "tx"); + if (IS_ERR(priv->dma_chan)) + return PTR_ERR(priv->dma_chan); + + ret = devm_add_action_or_reset(dev, sunxi_ledc_dma_cleanup, priv); + if (ret) + return ret; + + dma_cfg.dst_addr = mem->start + LEDC_DATA_REG; + dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_cfg.dst_maxburst = LEDC_FIFO_DEPTH / 2; + ret = dmaengine_slave_config(priv->dma_chan, &dma_cfg); + if (ret) + return ret; + + priv->buffer = dma_alloc_wc(dmaengine_get_dma_device(priv->dma_chan), + LEDS_TO_BYTES(priv->num_leds), + &priv->dma_handle, GFP_KERNEL); + if (!priv->buffer) + return -ENOMEM; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + ret = devm_request_irq(dev, irq, sunxi_ledc_irq, 0, dev_name(dev), priv); + if (ret) + return ret; + + ret = sunxi_ledc_resume(dev); + if (ret) + return ret; + + for_each_available_child_of_node(np, child) { + struct sunxi_ledc_led *led; + struct led_classdev *cdev; + u32 addr, color; + + ret = of_property_read_u32(child, "reg", &addr); + if (ret || addr >= count) { + dev_err(dev, "LED 'reg' values must be from 0 to %d\n", + priv->num_leds - 1); + ret = -EINVAL; + goto err_put_child; + } + + ret = of_property_read_u32(child, "color", &color); + if (ret || color != LED_COLOR_ID_RGB) { + dev_err(dev, "LED 'color' must be LED_COLOR_ID_RGB\n"); + ret = -EINVAL; + goto err_put_child; + } + + led = &priv->leds[addr]; + + led->subled_info[0].color_index = LED_COLOR_ID_RED; + led->subled_info[0].channel = 0; + led->subled_info[1].color_index = LED_COLOR_ID_GREEN; + led->subled_info[1].channel = 1; + led->subled_info[2].color_index = LED_COLOR_ID_BLUE; + led->subled_info[2].channel = 2; + + led->mc_cdev.num_colors = ARRAY_SIZE(led->subled_info); + led->mc_cdev.subled_info = led->subled_info; + + cdev = &led->mc_cdev.led_cdev; + cdev->max_brightness = U8_MAX; + cdev->brightness_set = sunxi_ledc_brightness_set; + + init_data.fwnode = of_fwnode_handle(child); + + ret = devm_led_classdev_multicolor_register_ext(dev, + &led->mc_cdev, + &init_data); + if (ret) { + dev_err(dev, "Failed to register LED %u: %d\n", addr, ret); + goto err_put_child; + } + } + + dev_info(dev, "Registered %d LEDs\n", priv->num_leds); + + return 0; + +err_put_child: + of_node_put(child); + sunxi_ledc_suspend(&pdev->dev); + + return ret; +} + +int sunxi_ledc_remove(struct platform_device *pdev) +{ + sunxi_ledc_suspend(&pdev->dev); + + return 0; +} + +void sunxi_ledc_shutdown(struct platform_device *pdev) +{ + sunxi_ledc_suspend(&pdev->dev); +} + +static const struct of_device_id sunxi_ledc_of_match[] = { + { .compatible = "allwinner,sun50i-r329-ledc" }, + {} +}; +MODULE_DEVICE_TABLE(of, sunxi_ledc_of_match); + +SIMPLE_DEV_PM_OPS(sunxi_ledc_pm, sunxi_ledc_suspend, sunxi_ledc_resume); + +static struct platform_driver sunxi_ledc_driver = { + .probe = sunxi_ledc_probe, + .remove = sunxi_ledc_remove, + .shutdown = sunxi_ledc_shutdown, + .driver = { + .name = "sunxi-ledc", + .of_match_table = sunxi_ledc_of_match, + .pm = pm_ptr(&sunxi_ledc_pm), + }, +}; +module_platform_driver(sunxi_ledc_driver); + +MODULE_AUTHOR("Samuel Holland "); +MODULE_DESCRIPTION("Allwinner sunxi LED controller driver"); +MODULE_LICENSE("GPL");