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    Subject[PATCH v5 1/2] mfd: Add anatop mfd driver
    Date
    From: "Ying-Chun Liu (PaulLiu)" <paul.liu@linaro.org>

    Anatop is a mfd chip embedded in Freescale i.MX6Q SoC.
    Anatop provides regulators and thermal.
    This driver handles the address space and the operation of the mfd device.

    Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
    Cc: Samuel Ortiz <sameo@linux.intel.com>
    Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
    Cc: Shawn Guo <shawn.guo@linaro.org>
    ---
    drivers/mfd/Kconfig | 6 ++
    drivers/mfd/Makefile | 1 +
    drivers/mfd/anatop-mfd.c | 144 ++++++++++++++++++++++++++++++++++++++++++++
    include/linux/mfd/anatop.h | 40 ++++++++++++
    4 files changed, 191 insertions(+), 0 deletions(-)
    create mode 100644 drivers/mfd/anatop-mfd.c
    create mode 100644 include/linux/mfd/anatop.h

    diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
    index f147395..f787d17 100644
    --- a/drivers/mfd/Kconfig
    +++ b/drivers/mfd/Kconfig
    @@ -830,6 +830,12 @@ config MFD_INTEL_MSIC
    Passage) chip. This chip embeds audio, battery, GPIO, etc.
    devices used in Intel Medfield platforms.

    +config MFD_ANATOP
    + bool "Support for Anatop"
    + depends on SOC_IMX6Q
    + help
    + Select this option to enable Anatop MFD driver.
    +
    endmenu
    endif

    diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
    index b953bab..8e11060 100644
    --- a/drivers/mfd/Makefile
    +++ b/drivers/mfd/Makefile
    @@ -112,3 +112,4 @@ obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
    obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
    obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
    obj-$(CONFIG_MFD_S5M_CORE) += s5m-core.o s5m-irq.o
    +obj-$(CONFIG_MFD_ANATOP) += anatop-mfd.o
    diff --git a/drivers/mfd/anatop-mfd.c b/drivers/mfd/anatop-mfd.c
    new file mode 100644
    index 0000000..86e2b8e
    --- /dev/null
    +++ b/drivers/mfd/anatop-mfd.c
    @@ -0,0 +1,144 @@
    +/*
    + * Anatop MFD driver
    + *
    + * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
    + * Copyright (C) 2012 Linaro
    + *
    + * 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, write to the Free Software Foundation, Inc.,
    + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    + * 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, write to the Free Software Foundation, Inc.,
    + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    + *
    + */
    +
    +#include <linux/io.h>
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/of.h>
    +#include <linux/of_platform.h>
    +#include <linux/of_address.h>
    +#include <linux/mfd/anatop.h>
    +
    +u32 anatop_get_bits(struct anatop *adata, u32 addr, int bit_shift, int bits)
    +{
    + u32 val;
    + int mask;
    +
    + if (bits == 32)
    + mask = ~0;
    + else
    + mask = (1 << bits) - 1;
    +
    + spin_lock(&adata->reglock);
    + val = readl(adata->ioreg + addr);
    + spin_unlock(&adata->reglock);
    + val = (val >> bit_shift) & mask;
    +
    + return val;
    +}
    +EXPORT_SYMBOL(anatop_get_bits);
    +
    +void anatop_set_bits(struct anatop *adata, u32 addr, int bit_shift,
    + int bits, u32 data)
    +{
    + u32 val;
    + int mask;
    + if (bits == 32)
    + mask = ~0;
    + else
    + mask = (1 << bits) - 1;
    +
    + spin_lock(&adata->reglock);
    + val = readl(adata->ioreg + addr) & ~(mask << bit_shift);
    + writel((data << bit_shift) | val, adata->ioreg);
    + spin_unlock(&adata->reglock);
    +}
    +EXPORT_SYMBOL(anatop_set_bits);
    +
    +static const struct of_device_id of_anatop_subdevice_match[] = {
    + { .compatible = "fsl,anatop-regulator", },
    + { .compatible = "fsl,anatop-thermal", },
    + { },
    +};
    +
    +static int of_anatop_probe(struct platform_device *pdev)
    +{
    + struct device *dev = &pdev->dev;
    + struct device_node *np = dev->of_node;
    + void *ioreg;
    + struct anatop *drvdata;
    +
    + ioreg = of_iomap(np, 0);
    + if (!ioreg)
    + return -EINVAL;
    + drvdata = devm_kzalloc(dev, sizeof(struct anatop), GFP_KERNEL);
    + if (!drvdata)
    + return -EINVAL;
    + drvdata->ioreg = ioreg;
    + spin_lock_init(&drvdata->reglock);
    + platform_set_drvdata(pdev, drvdata);
    + of_platform_bus_probe(np, of_anatop_subdevice_match, dev);
    +
    + return 0;
    +}
    +
    +static int of_anatop_remove(struct platform_device *pdev)
    +{
    + struct anatop *drvdata;
    + drvdata = platform_get_drvdata(pdev);
    + iounmap(drvdata->ioreg);
    + return 0;
    +}
    +
    +static const struct of_device_id of_anatop_match[] = {
    + { .compatible = "fsl,imx6q-anatop", },
    + { },
    +};
    +
    +static struct platform_driver anatop_of_driver = {
    + .driver = {
    + .name = "anatop-mfd",
    + .owner = THIS_MODULE,
    + .of_match_table = of_anatop_match,
    + },
    + .probe = of_anatop_probe,
    + .remove = of_anatop_remove,
    +};
    +
    +static int __init anatop_init(void)
    +{
    + return platform_driver_register(&anatop_of_driver);
    +}
    +postcore_initcall(anatop_init);
    +
    +static void __exit anatop_exit(void)
    +{
    + platform_driver_unregister(&anatop_of_driver);
    +}
    +module_exit(anatop_exit);
    +
    +MODULE_AUTHOR("Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
    +MODULE_DESCRIPTION("ANATOP MFD driver");
    +MODULE_LICENSE("GPL v2");
    diff --git a/include/linux/mfd/anatop.h b/include/linux/mfd/anatop.h
    new file mode 100644
    index 0000000..22c1007
    --- /dev/null
    +++ b/include/linux/mfd/anatop.h
    @@ -0,0 +1,40 @@
    +/*
    + * anatop.h - Anatop MFD driver
    + *
    + * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
    + * Copyright (C) 2012 Linaro
    + *
    + * 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, write to the Free Software
    + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    + */
    +
    +#ifndef __LINUX_MFD_ANATOP_H
    +#define __LINUX_MFD_ANATOP_H
    +
    +#include <linux/spinlock.h>
    +
    +/**
    + * anatop - MFD data
    + * @ioreg: ioremap register
    + * @reglock: spinlock for register read/write
    + */
    +struct anatop {
    + void *ioreg;
    + spinlock_t reglock;
    +};
    +
    +extern u32 anatop_get_bits(struct anatop *, u32, int, int);
    +extern void anatop_set_bits(struct anatop *, u32, int, int, u32);
    +
    +#endif /* __LINUX_MFD_ANATOP_H */
    --
    1.7.9


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