| Message ID | 20180807220011.24436-2-maxi.jourdan@wanadoo.fr (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | soc: amlogic: add meson-canvas | expand |
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 <maxi.jourdan@wanadoo.fr> > Tested-by: Neil Armstrong <narmstrong@baylibre.com> 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 <jbrunet@baylibre.com> > --- > 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 <maxi.jourdan@wanadoo.fr> > + * Copyright (C) 2016 BayLibre, SAS > + * Author: Neil Armstrong <narmstrong@baylibre.com> > + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. > + * Copyright (C) 2014 Endless Mobile > + */ > + > +#include <linux/kernel.h> > +#include <linux/mfd/syscon.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > +#include <linux/soc/amlogic/meson-canvas.h> > +#include <linux/of_address.h> > +#include <linux/of_platform.h> > +#include <linux/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; > + 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 <maxi.jourdan@wanadoo.fr>"); > +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 <maxi.jourdan@wanadoo.fr> > + */ > +#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 > + > +#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
On 08/08/2018 09:45, Jerome Brunet wrote: > 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 <maxi.jourdan@wanadoo.fr> >> Tested-by: Neil Armstrong <narmstrong@baylibre.com> > > 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 <jbrunet@baylibre.com> > >> --- >> 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 <maxi.jourdan@wanadoo.fr> >> + * Copyright (C) 2016 BayLibre, SAS >> + * Author: Neil Armstrong <narmstrong@baylibre.com> >> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. >> + * Copyright (C) 2014 Endless Mobile >> + */ >> + >> +#include <linux/kernel.h> >> +#include <linux/mfd/syscon.h> >> +#include <linux/module.h> >> +#include <linux/regmap.h> >> +#include <linux/soc/amlogic/meson-canvas.h> >> +#include <linux/of_address.h> >> +#include <linux/of_platform.h> >> +#include <linux/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; >> + 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); >> + } I should be -EPROBE_DEFER here since the canvas driver maybe hasn't probed yet. >> + >> + canvas = dev_get_drvdata(&canvas_pdev->dev); >> + if (!canvas) >> + return ERR_PTR(-ENODEV); > > You've got your device at this point, maybe EINVAL instead ? This shouldn't fail here... I'm not sure what should be the error. > >> + >> + 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 ? It's explicit in the Amlogic source, you need a readback to make sure it's taken in account. > > >> + 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 <maxi.jourdan@wanadoo.fr>"); >> +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 <maxi.jourdan@wanadoo.fr> >> + */ >> +#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 >> + >> +#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 > >
2018-08-08 17:10 GMT+02:00 Neil Armstrong <narmstrong@baylibre.com>: > On 08/08/2018 09:45, Jerome Brunet wrote: >> 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 <maxi.jourdan@wanadoo.fr> >>> Tested-by: Neil Armstrong <narmstrong@baylibre.com> >> >> 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 <jbrunet@baylibre.com> >> >>> --- >>> 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 <maxi.jourdan@wanadoo.fr> >>> + * Copyright (C) 2016 BayLibre, SAS >>> + * Author: Neil Armstrong <narmstrong@baylibre.com> >>> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. >>> + * Copyright (C) 2014 Endless Mobile >>> + */ >>> + >>> +#include <linux/kernel.h> >>> +#include <linux/mfd/syscon.h> >>> +#include <linux/module.h> >>> +#include <linux/regmap.h> >>> +#include <linux/soc/amlogic/meson-canvas.h> >>> +#include <linux/of_address.h> >>> +#include <linux/of_platform.h> >>> +#include <linux/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; >>> + 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); >>> + } > > I should be -EPROBE_DEFER here since the canvas driver maybe hasn't probed yet. Ack. >>> + >>> + canvas = dev_get_drvdata(&canvas_pdev->dev); >>> + if (!canvas) >>> + return ERR_PTR(-ENODEV); >> >> You've got your device at this point, maybe EINVAL instead ? > > This shouldn't fail here... I'm not sure what should be the error. I wasn't sure if it was possible to retrieve the pdev with a failed probe. Should I just assume canvas will never be NULL here then ? >> >>> + >>> + 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 ? > > > It's explicit in the Amlogic source, you need a readback to make sure it's taken in account. > >> >> >>> + 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 <maxi.jourdan@wanadoo.fr>"); >>> +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 <maxi.jourdan@wanadoo.fr> >>> + */ >>> +#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 >>> + >>> +#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 ? >> Ack. >>> + */ >>> +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 >> >> > > > _______________________________________________ > linux-amlogic mailing list > linux-amlogic@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-amlogic Maxime
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 <maxi.jourdan@wanadoo.fr> + * Copyright (C) 2016 BayLibre, SAS + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. + * Copyright (C) 2014 Endless Mobile + */ + +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/soc/amlogic/meson-canvas.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/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; + 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); + + 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); + 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 <maxi.jourdan@wanadoo.fr>"); +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 <maxi.jourdan@wanadoo.fr> + */ +#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 + +#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 + */ +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