[PATCH v8 1/2] mfd: add atmel-hlcdc driver
Lee Jones
lee.jones at linaro.org
Tue Oct 7 02:44:27 PDT 2014
On Mon, 06 Oct 2014, Boris Brezillon wrote:
> 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: Boris Brezillon <boris.brezillon at free-electrons.com>
> Acked-by: Lee Jones <lee.jones at linaro.org>
> Tested-by: Anthony Harivel <anthony.harivel at emtrion.de>
> Tested-by: Ludovic Desroches <ludovic.desroches at atmel.com>
> ---
> drivers/mfd/Kconfig | 6 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/atmel-hlcdc.c | 122 ++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/atmel-hlcdc.h | 85 ++++++++++++++++++++++++++++
> 4 files changed, 214 insertions(+)
> create mode 100644 drivers/mfd/atmel-hlcdc.c
> create mode 100644 include/linux/mfd/atmel-hlcdc.h
Applied for v3.19.
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index de5abf2..1b925f7 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -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
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index f001487..df36f68 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -156,6 +156,7 @@ obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o ssbi.o
> obj-$(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
> diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c
> new file mode 100644
> index 0000000..cfd58f4
> --- /dev/null
> +++ b/drivers/mfd/atmel-hlcdc.c
> @@ -0,0 +1,122 @@
> +/*
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Boris BREZILLON <boris.brezillon at 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 at free-electrons.com>");
> +MODULE_DESCRIPTION("Atmel HLCDC driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/atmel-hlcdc.h b/include/linux/mfd/atmel-hlcdc.h
> new file mode 100644
> index 0000000..1279ab1
> --- /dev/null
> +++ b/include/linux/mfd/atmel-hlcdc.h
> @@ -0,0 +1,85 @@
> +/*
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Boris BREZILLON <boris.brezillon at 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 */
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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