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[209.132.180.67]) by mx.google.com with ESMTP id m20-v6si3579653pgb.392.2018.08.08.00.47.01; Wed, 08 Aug 2018 00:47:16 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@baylibre-com.20150623.gappssmtp.com header.s=20150623 header.b=VSoRZNAF; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727140AbeHHKER (ORCPT + 99 others); Wed, 8 Aug 2018 06:04:17 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:44050 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726905AbeHHKER (ORCPT ); Wed, 8 Aug 2018 06:04:17 -0400 Received: by mail-wr1-f68.google.com with SMTP id r16-v6so1078460wrt.11 for ; Wed, 08 Aug 2018 00:45:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=message-id:subject:from:to:cc:date:in-reply-to:references :mime-version:content-transfer-encoding; bh=rAreranpsA+pyxEnliWiX/1pph+mv+IAZ5ITULqbcfU=; b=VSoRZNAF+NiqbFRHOmYCMUoeBqiGGOeVCUh2OASWoI02E7asw7kNbl+AzNVEj3lmIr 0IP5Huy0DmqCnNacaQ+m3LXhTihLy+BpRWSRZ6dWPOWdLFGPJrHmp5JMMs0sqLEmzOQx jxtIiGWVNg56ePao8vQk9nrmqCXv5JQXE1XjlvrIJH+V+z5ctw5KYPVNaeNoq+vg/osU FCFEWUFUrgbuO1bhnsttIjlHLe8KTICNFh8h5Ch/Jye406sVGh54kt4gkeAa5ypYJ8g7 +kAf4lyBwmur3ayuRhPT1j5XjI3ZlDw3kMzNWnDmYExOi9zm/S/oHMsg91nhiqNQYJKa ad0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:mime-version:content-transfer-encoding; bh=rAreranpsA+pyxEnliWiX/1pph+mv+IAZ5ITULqbcfU=; b=YARvdmT1MtUCrG7hDDYFZYkUJsh841s6QiBV4n2dbg7pIOv7riB7BLsWKqLX50A9ok WCwh22fYT441rnEeTHIDHQZV+CabIUIBJBNXCNmXNmlEzDxgwrn3nE3S3pJFxileHsrM MW8qrQB0cc6YqAONjdNGfC9H0Lvr5R9+TYbY8kR6ZVkZ/qwxDc9WPBz+mAnX3BHSMLz2 Dy1fNSVfF6oStLtMm72SzGpa/MPbLIeVKW1O53DaC8PsH1m5C75qke1pCyftmHcZMzBx u5a2H7jN/10bOiGcnvb57k8uRAZ1fTVSE4tUNbOGgDO7OE147NG3wwoBm1AmOx+xhLq4 dbLA== X-Gm-Message-State: AOUpUlG6f0W1mKs3ZPT2bH4rsnJKy30ZjpDv2FFJmvTezN+AIL99xQm1 vf/u2mvORYc5mztqYYFgg9uW/Q== X-Received: by 2002:adf:be03:: with SMTP id n3-v6mr1140770wrh.267.1533714348339; Wed, 08 Aug 2018 00:45:48 -0700 (PDT) Received: from boomer ([90.63.244.31]) by smtp.gmail.com with ESMTPSA id l72-v6sm10664414wma.17.2018.08.08.00.45.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 08 Aug 2018 00:45:47 -0700 (PDT) Message-ID: Subject: Re: [PATCH v2 1/4] soc: amlogic: add meson-canvas driver From: Jerome Brunet To: Maxime Jourdan , Kevin Hilman Cc: Neil Armstrong , linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Date: Wed, 08 Aug 2018 09:45:46 +0200 In-Reply-To: <20180807220011.24436-2-maxi.jourdan@wanadoo.fr> References: <20180807220011.24436-1-maxi.jourdan@wanadoo.fr> <20180807220011.24436-2-maxi.jourdan@wanadoo.fr> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5 (3.28.5-1.fc28) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2018-08-08 at 00:00 +0200, Maxime Jourdan wrote: > Amlogic SoCs have a repository of 256 canvas which they use to > describe pixel buffers. > > They contain metadata like width, height, block mode, endianness [..] > > Many IPs within those SoCs like vdec/vpu rely on those canvas to read/write > pixels. > > Signed-off-by: Maxime Jourdan > Tested-by: Neil Armstrong Thanks for making the changes Martin, I do prefer this version. You did not have to drop the ops, until it is really needed because of some SoC quirks, I guess it is simpler this way With some answers to the nitpicks below, feel free to add : Reviewed-by: Jerome Brunet > --- > drivers/soc/amlogic/Kconfig | 7 + > drivers/soc/amlogic/Makefile | 1 + > drivers/soc/amlogic/meson-canvas.c | 185 +++++++++++++++++++++++ > include/linux/soc/amlogic/meson-canvas.h | 65 ++++++++ > 4 files changed, 258 insertions(+) > create mode 100644 drivers/soc/amlogic/meson-canvas.c > create mode 100644 include/linux/soc/amlogic/meson-canvas.h > > diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig > index b04f6e4aedbc..2f282b472912 100644 > --- a/drivers/soc/amlogic/Kconfig > +++ b/drivers/soc/amlogic/Kconfig > @@ -1,5 +1,12 @@ > menu "Amlogic SoC drivers" > > +config MESON_CANVAS > + tristate "Amlogic Meson Canvas driver" > + depends on ARCH_MESON || COMPILE_TEST > + default n > + help > + Say yes to support the canvas IP for Amlogic SoCs. > + > config MESON_GX_SOCINFO > bool "Amlogic Meson GX SoC Information driver" > depends on ARCH_MESON || COMPILE_TEST > diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile > index 8fa321893928..0ab16d35ac36 100644 > --- a/drivers/soc/amlogic/Makefile > +++ b/drivers/soc/amlogic/Makefile > @@ -1,3 +1,4 @@ > +obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o > obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o > obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o > obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o > diff --git a/drivers/soc/amlogic/meson-canvas.c b/drivers/soc/amlogic/meson-canvas.c > new file mode 100644 > index 000000000000..c461334b36d4 > --- /dev/null > +++ b/drivers/soc/amlogic/meson-canvas.c > @@ -0,0 +1,185 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright (C) 2018 Maxime Jourdan > + * Copyright (C) 2016 BayLibre, SAS > + * Author: Neil Armstrong > + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. > + * Copyright (C) 2014 Endless Mobile > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define NUM_CANVAS 256 > + > +/* DMC Registers */ > +#define DMC_CAV_LUT_DATAL 0x48 /* 0x12 offset in data sheet */ > + #define CANVAS_WIDTH_LBIT 29 > + #define CANVAS_WIDTH_LWID 3 > +#define DMC_CAV_LUT_DATAH 0x4c /* 0x13 offset in data sheet */ > + #define CANVAS_WIDTH_HBIT 0 > + #define CANVAS_HEIGHT_BIT 9 > + #define CANVAS_BLKMODE_BIT 24 > +#define DMC_CAV_LUT_ADDR 0x50 /* 0x14 offset in data sheet */ > + #define CANVAS_LUT_WR_EN (0x2 << 8) > + #define CANVAS_LUT_RD_EN (0x1 << 8) > + > +struct meson_canvas { > + struct device *dev; > + struct regmap *regmap_dmc; > + spinlock_t lock; /* canvas device lock */ > + u8 used[NUM_CANVAS]; > +}; > + > +struct meson_canvas *meson_canvas_get(struct device *dev) > +{ > + struct device_node *canvas_node; > + struct platform_device *canvas_pdev; > + struct meson_canvas *canvas; > + > + canvas_node = of_parse_phandle(dev->of_node, "amlogic,canvas", 0); > + if (!canvas_node) > + return ERR_PTR(-ENODEV); > + > + canvas_pdev = of_find_device_by_node(canvas_node); > + if (!canvas_pdev) { > + dev_err(dev, "Unable to find canvas pdev\n"); > + return ERR_PTR(-ENODEV); > + } > + > + canvas = dev_get_drvdata(&canvas_pdev->dev); > + if (!canvas) > + return ERR_PTR(-ENODEV); You've got your device at this point, maybe EINVAL instead ? > + > + return canvas; > +} > +EXPORT_SYMBOL_GPL(meson_canvas_get); > + > +int meson_canvas_setup(struct meson_canvas *canvas, u8 canvas_index, > + u32 addr, u32 stride, u32 height, > + unsigned int wrap, > + unsigned int blkmode, > + unsigned int endian) > +{ > + struct regmap *regmap = canvas->regmap_dmc; > + unsigned long flags; > + u32 val; > + > + spin_lock_irqsave(&canvas->lock, flags); > + if (!canvas->used[canvas_index]) { > + dev_err(canvas->dev, > + "Trying to setup non allocated canvas %u\n", > + canvas_index); > + spin_unlock_irqrestore(&canvas->lock, flags); > + return -EINVAL; > + } > + > + regmap_write(regmap, DMC_CAV_LUT_DATAL, > + ((addr + 7) >> 3) | > + (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT)); > + > + regmap_write(regmap, DMC_CAV_LUT_DATAH, > + ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) << > + CANVAS_WIDTH_HBIT) | > + (height << CANVAS_HEIGHT_BIT) | > + (wrap << 22) | > + (blkmode << CANVAS_BLKMODE_BIT) | > + (endian << 26)); > + > + regmap_write(regmap, DMC_CAV_LUT_ADDR, > + CANVAS_LUT_WR_EN | canvas_index); > + > + /* Force a read-back to make sure everything is flushed. */ > + regmap_read(regmap, DMC_CAV_LUT_DATAH, &val); I suppose this something you got from the vendor kernel ? Out of curiosity, have you tried w/o it ? I am wondering if this is really necessary ? > + spin_unlock_irqrestore(&canvas->lock, flags); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(meson_canvas_setup); > + > +int meson_canvas_alloc(struct meson_canvas *canvas, u8 *canvas_index) > +{ > + int i; > + unsigned long flags; > + > + spin_lock_irqsave(&canvas->lock, flags); > + for (i = 0; i < NUM_CANVAS; ++i) { > + if (!canvas->used[i]) { > + canvas->used[i] = 1; > + spin_unlock_irqrestore(&canvas->lock, flags); > + *canvas_index = i; > + return 0; > + } > + } > + spin_unlock_irqrestore(&canvas->lock, flags); > + > + dev_err(canvas->dev, "No more canvas available\n"); > + return -ENODEV; > +} > +EXPORT_SYMBOL_GPL(meson_canvas_alloc); > + > +int meson_canvas_free(struct meson_canvas *canvas, u8 canvas_index) > +{ > + unsigned long flags; > + > + spin_lock_irqsave(&canvas->lock, flags); > + if (!canvas->used[canvas_index]) { > + dev_err(canvas->dev, > + "Trying to free unused canvas %u\n", canvas_index); > + spin_unlock_irqrestore(&canvas->lock, flags); > + return -EINVAL; > + } > + canvas->used[canvas_index] = 0; > + spin_unlock_irqrestore(&canvas->lock, flags); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(meson_canvas_free); > + > +static int meson_canvas_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct meson_canvas *canvas; > + > + canvas = devm_kzalloc(dev, sizeof(*canvas), GFP_KERNEL); > + if (!canvas) > + return -ENOMEM; > + > + canvas->regmap_dmc = > + syscon_node_to_regmap(of_get_parent(dev->of_node)); > + if (IS_ERR(canvas->regmap_dmc)) { > + dev_err(dev, "failed to get DMC regmap\n"); > + return PTR_ERR(canvas->regmap_dmc); > + } > + > + canvas->dev = dev; > + spin_lock_init(&canvas->lock); > + dev_set_drvdata(dev, canvas); > + > + return 0; > +} > + > +static const struct of_device_id canvas_dt_match[] = { > + { .compatible = "amlogic,canvas" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, canvas_dt_match); > + > +static struct platform_driver meson_canvas_driver = { > + .probe = meson_canvas_probe, > + .driver = { > + .name = "amlogic-canvas", > + .of_match_table = canvas_dt_match, > + }, > +}; > +module_platform_driver(meson_canvas_driver); > + > +MODULE_DESCRIPTION("Amlogic Canvas driver"); > +MODULE_AUTHOR("Maxime Jourdan "); > +MODULE_LICENSE("GPL"); > diff --git a/include/linux/soc/amlogic/meson-canvas.h b/include/linux/soc/amlogic/meson-canvas.h > new file mode 100644 > index 000000000000..c164202d8e39 > --- /dev/null > +++ b/include/linux/soc/amlogic/meson-canvas.h > @@ -0,0 +1,65 @@ > +/* SPDX-License-Identifier: GPL-2.0+ */ > +/* > + * Copyright (C) 2018 Maxime Jourdan > + */ > +#ifndef MESON_CANVAS_H > +#define MESON_CANVAS_H > + > +#include > + > +#define MESON_CANVAS_WRAP_NONE 0x00 > +#define MESON_CANVAS_WRAP_X 0x01 > +#define MESON_CANVAS_WRAP_Y 0x02 > + > +#define MESON_CANVAS_BLKMODE_LINEAR 0x00 > +#define MESON_CANVAS_BLKMODE_32x32 0x01 > +#define MESON_CANVAS_BLKMODE_64x64 0x02 > + > +#define MESON_CANVAS_ENDIAN_SWAP16 0x1 > +#define MESON_CANVAS_ENDIAN_SWAP32 0x3 > +#define MESON_CANVAS_ENDIAN_SWAP64 0x7 > +#define MESON_CANVAS_ENDIAN_SWAP128 0xf > + > +struct meson_canvas; > + > +/** > + * meson_canvas_get() - get a canvas provider instance > + * > + * @dev: your device s/your device/consumer device pointer ? > + */ > +struct meson_canvas *meson_canvas_get(struct device *dev); > + > +/** > + * meson_canvas_alloc() - take ownership of a canvas > + * > + * @canvas: canvas provider instance retrieved from meson_canvas_get() > + * @canvas_index: will be filled with the canvas ID > + */ > +int meson_canvas_alloc(struct meson_canvas *canvas, u8 *canvas_index); > + > +/** > + * meson_canvas_free() - remove ownership from a canvas > + * > + * @canvas: canvas provider instance retrieved from meson_canvas_get() > + * @canvas_index: canvas ID that was obtained via meson_canvas_alloc() > + */ > +int meson_canvas_free(struct meson_canvas *canvas, u8 canvas_index); > + > +/** > + * meson_canvas_setup() - configure a canvas > + * > + * @canvas: canvas provider instance retrieved from meson_canvas_get() > + * @canvas_index: canvas ID that was obtained via meson_canvas_alloc() > + * @addr: physical address to the pixel buffer > + * @stride: width of the buffer > + * @height: height of the buffer > + * @wrap: undocumented > + * @blkmode: block mode (linear, 32x32, 64x64) > + * @endian: byte swapping (swap16, swap32, swap64, swap128) > + */ > +int meson_canvas_setup(struct meson_canvas *canvas, u8 canvas_index, > + u32 addr, u32 stride, u32 height, > + unsigned int wrap, unsigned int blkmode, > + unsigned int endian); > + > +#endif