Messages in this thread Patch in this message | | | From | Maxime Jourdan <> | Subject | [PATCH 1/4] soc: amlogic: add meson-canvas driver | Date | Wed, 1 Aug 2018 20:51:25 +0200 |
| |
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 <maxi.jourdan@wanadoo.fr> --- drivers/soc/amlogic/Kconfig | 7 + drivers/soc/amlogic/Makefile | 1 + drivers/soc/amlogic/meson-canvas.c | 182 +++++++++++++++++++++++ include/linux/soc/amlogic/meson-canvas.h | 37 +++++ 4 files changed, 227 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..5bd049899d88 100644 --- a/drivers/soc/amlogic/Kconfig +++ b/drivers/soc/amlogic/Kconfig @@ -1,5 +1,12 @@ menu "Amlogic SoC drivers" +config MESON_CANVAS + bool "Amlogic Meson Canvas driver" + depends on ARCH_MESON || COMPILE_TEST + default ARCH_MESON + help + Say yes to support the canvas IP within Amlogic Meson Soc family. + 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..671eb89c8904 --- /dev/null +++ b/drivers/soc/amlogic/meson-canvas.c @@ -0,0 +1,182 @@ +/* + * Copyright (C) 2018 Maxime Jourdan + * Copyright (C) 2016 BayLibre, SAS + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. + * Copyright (C) 2014 Endless Mobile + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <linux/soc/amlogic/meson-canvas.h> +#include <asm/io.h> + +#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; + struct mutex lock; + u8 used[NUM_CANVAS]; +}; + +static struct meson_canvas canvas = { 0 }; + +static int meson_canvas_setup(uint8_t canvas_index, uint32_t addr, + uint32_t stride, uint32_t height, + unsigned int wrap, + unsigned int blkmode, + unsigned int endian) +{ + struct regmap *regmap = canvas.regmap_dmc; + u32 val; + + mutex_lock(&canvas.lock); + + if (!canvas.used[canvas_index]) { + dev_err(canvas.dev, + "Trying to setup non allocated canvas %u\n", + canvas_index); + mutex_unlock(&canvas.lock); + 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); + mutex_unlock(&canvas.lock); + + return 0; +} + +static int meson_canvas_alloc(uint8_t *canvas_index) +{ + int i; + + mutex_lock(&canvas.lock); + for (i = 0; i < NUM_CANVAS; ++i) { + if (!canvas.used[i]) { + canvas.used[i] = 1; + mutex_unlock(&canvas.lock); + *canvas_index = i; + return 0; + } + } + mutex_unlock(&canvas.lock); + dev_err(canvas.dev, "No more canvas available\n"); + + return -ENODEV; +} + +static int meson_canvas_free(uint8_t canvas_index) +{ + mutex_lock(&canvas.lock); + if (!canvas.used[canvas_index]) { + dev_err(canvas.dev, + "Trying to free unused canvas %u\n", canvas_index); + mutex_unlock(&canvas.lock); + return -EINVAL; + } + canvas.used[canvas_index] = 0; + mutex_unlock(&canvas.lock); + + return 0; +} + +static struct meson_canvas_platform_data canvas_platform_data = { + .alloc = meson_canvas_alloc, + .free = meson_canvas_free, + .setup = meson_canvas_setup, +}; + +static int meson_canvas_probe(struct platform_device *pdev) +{ + struct regmap *regmap_dmc; + struct device *dev; + + dev = &pdev->dev; + + regmap_dmc = syscon_node_to_regmap(of_get_parent(dev->of_node)); + if (IS_ERR(regmap_dmc)) { + dev_err(&pdev->dev, "failed to get DMC regmap\n"); + return PTR_ERR(regmap_dmc); + } + + canvas.dev = dev; + canvas.regmap_dmc = regmap_dmc; + mutex_init(&canvas.lock); + + dev->platform_data = &canvas_platform_data; + + return 0; +} + +static int meson_canvas_remove(struct platform_device *pdev) +{ + mutex_destroy(&canvas.lock); + return 0; +} + +static const struct of_device_id canvas_dt_match[] = { + { .compatible = "amlogic,meson-canvas" }, + {} +}; +MODULE_DEVICE_TABLE(of, canvas_dt_match); + +static struct platform_driver meson_canvas_driver = { + .probe = meson_canvas_probe, + .remove = meson_canvas_remove, + .driver = { + .name = "meson-canvas", + .of_match_table = canvas_dt_match, + }, +}; +module_platform_driver(meson_canvas_driver); + +MODULE_ALIAS("platform:meson-canvas"); +MODULE_DESCRIPTION("AMLogic Meson Canvas driver"); +MODULE_AUTHOR("Maxime Jourdan <maxi.jourdan@wanadoo.fr>"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/soc/amlogic/meson-canvas.h b/include/linux/soc/amlogic/meson-canvas.h new file mode 100644 index 000000000000..af9e2415056a --- /dev/null +++ b/include/linux/soc/amlogic/meson-canvas.h @@ -0,0 +1,37 @@ +/* + * Copyright (c) 2018 Maxime Jourdan + * Author: Maxime Jourdan <maxi.jourdan@wanadoo.fr> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#ifndef MESON_CANVAS_H +#define MESON_CANVAS_H + +#include <linux/kernel.h> + +#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 + +struct meson_canvas_platform_data { + int (*alloc)(uint8_t *canvas_index); + int (*free) (uint8_t canvas_index); + int (*setup)(uint8_t canvas_index, uint32_t addr, + uint32_t stride, uint32_t height, + unsigned int wrap, + unsigned int blkmode, + unsigned int endian); +}; + +#endif -- 2.17.1
| |