Commit 2c86e9fb authored by Boris Brezillon's avatar Boris Brezillon Committed by Lee Jones
Browse files

mfd: Add atmel-hlcdc driver 



The HLCDC IP available on some Atmel SoCs (i.e. at91sam9n12, at91sam9x5
family or sama5d3 family) exposes 2 subdevices:
- a display controller (controlled by a DRM driver)
- a PWM chip

The MFD device provides a regmap and several clocks (those connected
to this hardware block) to its subdevices.

This way concurrent accesses to the iomem range are handled by the regmap
framework, and each subdevice can safely access HLCDC registers.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: default avatarAnthony Harivel <anthony.harivel@emtrion.de>
Tested-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 6e3f62f0

drivers/mfd/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -59,6 +59,12 @@ config MFD_AAT2870_CORE 
	  additional drivers must be enabled in order to use the

	  functionality of the device.



config MFD_ATMEL_HLCDC

	tristate

	select MFD_CORE

	select REGMAP_MMIO

	depends on OF



config MFD_BCM590XX

	tristate "Broadcom BCM590xx PMUs"

	select MFD_CORE

drivers/mfd/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -157,6 +157,7 @@ obj-$(CONFIG_MFD_SPMI_PMIC) += qcom-spmi-pmic.o 
obj-$(CONFIG_TPS65911_COMPARATOR)	+= tps65911-comparator.o

obj-$(CONFIG_MFD_TPS65090)	+= tps65090.o

obj-$(CONFIG_MFD_AAT2870_CORE)	+= aat2870-core.o

obj-$(CONFIG_MFD_ATMEL_HLCDC)	+= atmel-hlcdc.o

obj-$(CONFIG_MFD_INTEL_MSIC)	+= intel_msic.o

obj-$(CONFIG_MFD_PALMAS)	+= palmas.o

obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o

drivers/mfd/atmel-hlcdc.c

0 → 100644
+122 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Free Electrons

 * Copyright (C) 2014 Atmel

 *

 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>

 *

 * 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.

 *

 * 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/clk.h>

#include <linux/mfd/atmel-hlcdc.h>

#include <linux/mfd/core.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>



#define ATMEL_HLCDC_REG_MAX		(0x4000 - 0x4)



static const struct mfd_cell atmel_hlcdc_cells[] = {

	{

		.name = "atmel-hlcdc-pwm",

		.of_compatible = "atmel,hlcdc-pwm",

	},

	{

		.name = "atmel-hlcdc-dc",

		.of_compatible = "atmel,hlcdc-display-controller",

	},

};



static const struct regmap_config atmel_hlcdc_regmap_config = {

	.reg_bits = 32,

	.val_bits = 32,

	.reg_stride = 4,

	.max_register = ATMEL_HLCDC_REG_MAX,

};



static int atmel_hlcdc_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct atmel_hlcdc *hlcdc;

	struct resource *res;

	void __iomem *regs;



	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);

	if (!hlcdc)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	regs = devm_ioremap_resource(dev, res);

	if (IS_ERR(regs))

		return PTR_ERR(regs);



	hlcdc->irq = platform_get_irq(pdev, 0);

	if (hlcdc->irq < 0)

		return hlcdc->irq;



	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");

	if (IS_ERR(hlcdc->periph_clk)) {

		dev_err(dev, "failed to get peripheral clock\n");

		return PTR_ERR(hlcdc->periph_clk);

	}



	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");

	if (IS_ERR(hlcdc->sys_clk)) {

		dev_err(dev, "failed to get system clock\n");

		return PTR_ERR(hlcdc->sys_clk);

	}



	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");

	if (IS_ERR(hlcdc->slow_clk)) {

		dev_err(dev, "failed to get slow clock\n");

		return PTR_ERR(hlcdc->slow_clk);

	}



	hlcdc->regmap = devm_regmap_init_mmio(dev, regs,

					      &atmel_hlcdc_regmap_config);

	if (IS_ERR(hlcdc->regmap))

		return PTR_ERR(hlcdc->regmap);



	dev_set_drvdata(dev, hlcdc);



	return mfd_add_devices(dev, -1, atmel_hlcdc_cells,

			       ARRAY_SIZE(atmel_hlcdc_cells),

			       NULL, 0, NULL);

}



static int atmel_hlcdc_remove(struct platform_device *pdev)

{

	mfd_remove_devices(&pdev->dev);



	return 0;

}



static const struct of_device_id atmel_hlcdc_match[] = {

	{ .compatible = "atmel,sama5d3-hlcdc" },

	{ /* sentinel */ },

};



static struct platform_driver atmel_hlcdc_driver = {

	.probe = atmel_hlcdc_probe,

	.remove = atmel_hlcdc_remove,

	.driver = {

		.name = "atmel-hlcdc",

		.of_match_table = atmel_hlcdc_match,

	},

};

module_platform_driver(atmel_hlcdc_driver);



MODULE_ALIAS("platform:atmel-hlcdc");

MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");

MODULE_DESCRIPTION("Atmel HLCDC driver");

MODULE_LICENSE("GPL v2");

include/linux/mfd/atmel-hlcdc.h

0 → 100644
+85 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Free Electrons

 * Copyright (C) 2014 Atmel

 *

 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#ifndef __LINUX_MFD_HLCDC_H

#define __LINUX_MFD_HLCDC_H



#include <linux/clk.h>

#include <linux/regmap.h>



#define ATMEL_HLCDC_CFG(i)		((i) * 0x4)

#define ATMEL_HLCDC_SIG_CFG		LCDCFG(5)

#define ATMEL_HLCDC_HSPOL		BIT(0)

#define ATMEL_HLCDC_VSPOL		BIT(1)

#define ATMEL_HLCDC_VSPDLYS		BIT(2)

#define ATMEL_HLCDC_VSPDLYE		BIT(3)

#define ATMEL_HLCDC_DISPPOL		BIT(4)

#define ATMEL_HLCDC_DITHER		BIT(6)

#define ATMEL_HLCDC_DISPDLY		BIT(7)

#define ATMEL_HLCDC_MODE_MASK		GENMASK(9, 8)

#define ATMEL_HLCDC_PP			BIT(10)

#define ATMEL_HLCDC_VSPSU		BIT(12)

#define ATMEL_HLCDC_VSPHO		BIT(13)

#define ATMEL_HLCDC_GUARDTIME_MASK	GENMASK(20, 16)



#define ATMEL_HLCDC_EN			0x20

#define ATMEL_HLCDC_DIS			0x24

#define ATMEL_HLCDC_SR			0x28

#define ATMEL_HLCDC_IER			0x2c

#define ATMEL_HLCDC_IDR			0x30

#define ATMEL_HLCDC_IMR			0x34

#define ATMEL_HLCDC_ISR			0x38



#define ATMEL_HLCDC_CLKPOL		BIT(0)

#define ATMEL_HLCDC_CLKSEL		BIT(2)

#define ATMEL_HLCDC_CLKPWMSEL		BIT(3)

#define ATMEL_HLCDC_CGDIS(i)		BIT(8 + (i))

#define ATMEL_HLCDC_CLKDIV_SHFT		16

#define ATMEL_HLCDC_CLKDIV_MASK		GENMASK(23, 16)

#define ATMEL_HLCDC_CLKDIV(div)		((div - 2) << ATMEL_HLCDC_CLKDIV_SHFT)



#define ATMEL_HLCDC_PIXEL_CLK		BIT(0)

#define ATMEL_HLCDC_SYNC		BIT(1)

#define ATMEL_HLCDC_DISP		BIT(2)

#define ATMEL_HLCDC_PWM			BIT(3)

#define ATMEL_HLCDC_SIP			BIT(4)



#define ATMEL_HLCDC_SOF			BIT(0)

#define ATMEL_HLCDC_SYNCDIS		BIT(1)

#define ATMEL_HLCDC_FIFOERR		BIT(4)

#define ATMEL_HLCDC_LAYER_STATUS(x)	BIT((x) + 8)



/**

 * Structure shared by the MFD device and its subdevices.

 *

 * @regmap: register map used to access HLCDC IP registers

 * @periph_clk: the hlcdc peripheral clock

 * @sys_clk: the hlcdc system clock

 * @slow_clk: the system slow clk

 * @irq: the hlcdc irq

 */

struct atmel_hlcdc {

	struct regmap *regmap;

	struct clk *periph_clk;

	struct clk *sys_clk;

	struct clk *slow_clk;

	int irq;

};



#endif /* __LINUX_MFD_HLCDC_H */

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