This adds driver to support HiSilicon Hi6421 PMIC. Hi6421 includes multi- functions, such as regulators, codec, ADCs, Coulomb counter, etc. This driver includes core APIs _only_.
Drivers for individul components, like voltage regulators, are implemented in corresponding driver directories and files. Memory-mapped I/O is the way to communicate with Hi6421. Signed-off-by: Guodong Xu <[email protected]> Signed-off-by: Haojian Zhuang <[email protected]> --- drivers/mfd/Kconfig | 11 +++ drivers/mfd/Makefile | 1 + drivers/mfd/hi6421-pmic-core.c | 171 +++++++++++++++++++++++++++++++++++++++ include/linux/mfd/hi6421-pmic.h | 55 +++++++++++++ 4 files changed, 238 insertions(+), 0 deletions(-) create mode 100644 drivers/mfd/hi6421-pmic-core.c create mode 100644 include/linux/mfd/hi6421-pmic.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index d54e985..111c109 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1116,6 +1116,17 @@ config MFD_WM8994 core support for the WM8994, in order to use the actual functionaltiy of the device other drivers must be enabled. +config MFD_HI6421_PMIC + tristate "HiSilicon Hi6421 PMU/Codec IC" + depends on OF + help + This driver supports HiSilicon Hi6421 PMIC. Hi6421 includes multi- + functions, such as regulators, codec, ADCs, Coulomb counter, etc. + This driver includes core APIs _only_. You have to select + individul components like voltage regulators under corresponding + menus in order to enable them. + Memory-mapped I/O is the way to communicate with Hi6421. + endmenu endif diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 718e94a..58cda25 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -155,3 +155,4 @@ obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o vexpress-sysreg.o obj-$(CONFIG_MFD_RETU) += retu-mfd.o obj-$(CONFIG_MFD_AS3711) += as3711.o +obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o diff --git a/drivers/mfd/hi6421-pmic-core.c b/drivers/mfd/hi6421-pmic-core.c new file mode 100644 index 0000000..3bf8c43 --- /dev/null +++ b/drivers/mfd/hi6421-pmic-core.c @@ -0,0 +1,171 @@ +/* + * Device driver for Hi6421 IC + * + * Copyright (c) <2011-2013> HiSilicon Technologies Co., Ltd. + * http://www.hisilicon.com + * Copyright (c) <2011-2013> Linaro Ltd. + * http://www.linaro.org + * + * Author: Guodong Xu <[email protected]> + * + * 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/slab.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_address.h> +#include <linux/mfd/hi6421-pmic.h> + +static struct of_device_id of_hi6421_pmic_child_match_tbl[] = { + /* regulators */ + { + .compatible = "hisilicon,hi6421-ldo", + }, + { + .compatible = "hisilicon,hi6421-buck012", + }, + { + .compatible = "hisilicon,hi6421-buck345", + }, + { /* end */ } +}; + +static struct of_device_id of_hi6421_pmic_match_tbl[] = { + { + .compatible = "hisilicon,hi6421-pmic", + }, + { /* end */ } +}; + +/* + * The PMIC register is only 8-bit. + * Hisilicon SoC use hardware to map PMIC register into SoC mapping. + * At here, we are accessing SoC register with 32-bit. + */ +u32 hi6421_pmic_read(struct hi6421_pmic *pmic, int reg) +{ + unsigned long flags; + u32 ret; + spin_lock_irqsave(&pmic->lock, flags); + ret = readl_relaxed(pmic->regs + (reg << 2)); + spin_unlock_irqrestore(&pmic->lock, flags); + return ret; +} +EXPORT_SYMBOL(hi6421_pmic_read); + +void hi6421_pmic_write(struct hi6421_pmic *pmic, int reg, u32 val) +{ + unsigned long flags; + spin_lock_irqsave(&pmic->lock, flags); + writel_relaxed(val, pmic->regs + (reg << 2)); + spin_unlock_irqrestore(&pmic->lock, flags); +} +EXPORT_SYMBOL(hi6421_pmic_write); + +void hi6421_pmic_rmw(struct hi6421_pmic *pmic, int reg, + u32 mask, u32 bits) +{ + u32 data; + + spin_lock(&pmic->lock); + data = readl_relaxed(pmic->regs + (reg << 2)) & ~mask; + data |= mask & bits; + writel_relaxed(data, pmic->regs + (reg << 2)); + spin_unlock(&pmic->lock); +} +EXPORT_SYMBOL(hi6421_pmic_rmw); + +static int hi6421_pmic_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct hi6421_pmic *pmic = NULL; + + pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL); + if (!pmic) { + dev_err(dev, "cannot allocate hi6421_pmic device info\n"); + return -ENOMEM; + } + + /* get resources */ + pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!pmic->res) { + dev_err(dev, "platform_get_resource err\n"); + return -ENOENT; + } + + if (!devm_request_mem_region(dev, pmic->res->start, + resource_size(pmic->res), + pdev->name)) { + dev_err(dev, "cannot claim register memory\n"); + return -ENOMEM; + } + + pmic->regs = devm_ioremap(dev, pmic->res->start, + resource_size(pmic->res)); + if (!pmic->regs) { + dev_err(dev, "cannot map register memory\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, pmic); + + spin_lock_init(&pmic->lock); + + /* set over-current protection debounce 8ms*/ + hi6421_pmic_rmw(pmic, OCP_DEB_CTRL_REG, + OCP_DEB_SEL_MASK | OCP_EN_DEBOUNCE_MASK | OCP_AUTO_STOP_MASK, + OCP_DEB_SEL_8MS | OCP_EN_DEBOUNCE_ENABLE); + + /* populate sub nodes */ + of_platform_populate(np, of_hi6421_pmic_child_match_tbl, NULL, dev); + + return 0; +} + +static int hi6421_pmic_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hi6421_pmic *pmic = platform_get_drvdata(pdev); + + devm_iounmap(dev, pmic->regs); + devm_release_mem_region(dev, pmic->res->start, + resource_size(pmic->res)); + devm_kfree(dev, pmic); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver hi6421_pmic_driver = { + .driver = { + .name = "hi6421_pmic", + .owner = THIS_MODULE, + .of_match_table = of_hi6421_pmic_match_tbl, + }, + .probe = hi6421_pmic_probe, + .remove = hi6421_pmic_remove, +}; +module_platform_driver(hi6421_pmic_driver); + +MODULE_AUTHOR("Guodong Xu <[email protected]>"); +MODULE_DESCRIPTION("Hi6421 PMIC driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/hi6421-pmic.h b/include/linux/mfd/hi6421-pmic.h new file mode 100644 index 0000000..2df16ba --- /dev/null +++ b/include/linux/mfd/hi6421-pmic.h @@ -0,0 +1,55 @@ +/* + * Header file for device driver Hi6421 PMIC + * + * Copyright (c) <2011-2013> HiSilicon Technologies Co., Ltd. + * http://www.hisilicon.com + * Copyright (c) <2011-2013> Linaro Ltd. + * http://www.linaro.org + * + * Author: Guodong Xu <[email protected]> + * + * 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. + */ + +#ifndef __HI6421_PMIC_H +#define __HI6421_PMIC_H + +#define OCP_DEB_CTRL_REG (0x51) +#define OCP_DEB_SEL_MASK (0x0C) +#define OCP_DEB_SEL_8MS (0x00) +#define OCP_DEB_SEL_16MS (0x04) +#define OCP_DEB_SEL_32MS (0x08) +#define OCP_DEB_SEL_64MS (0x0C) +#define OCP_EN_DEBOUNCE_MASK (0x02) +#define OCP_EN_DEBOUNCE_ENABLE (0x02) +#define OCP_AUTO_STOP_MASK (0x01) +#define OCP_AUTO_STOP_ENABLE (0x01) +#define HI6421_REGS_ENA_PROTECT_TIME (100) /* in microseconds */ +#define HI6421_ECO_MODE_ENABLE (1) +#define HI6421_ECO_MODE_DISABLE (0) + +struct hi6421_pmic { + struct resource *res; + struct device *dev; + void __iomem *regs; + spinlock_t lock; +}; + +/* Register Access Helpers */ +u32 hi6421_pmic_read(struct hi6421_pmic *pmic, int reg); +void hi6421_pmic_write(struct hi6421_pmic *pmic, int reg, u32 val); +void hi6421_pmic_rmw(struct hi6421_pmic *pmic, int reg, u32 mask, u32 bits); + +#endif /* __HI6421_PMIC_H */ -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
