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Message-Id: <1370356123-22357-2-git-send-email-guodong.xu@linaro.org>
Date: Tue, 4 Jun 2013 22:28:41 +0800
From: Guodong Xu <guodong.xu@...aro.org>
To: sameo@...ux.intel.com, lgirdwood@...il.com, broonie@...nel.org
Cc: linux-kernel@...r.kernel.org, patches@...aro.org,
guodong.xu@...aro.org, Haojian Zhuang <haojian.zhuang@...aro.org>
Subject: [PATCH 1/3] mfd: Add hi6421 PMIC core driver
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 <guodong.xu@...aro.org>
Signed-off-by: Haojian Zhuang <haojian.zhuang@...aro.org>
---
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 <guodong.xu@...aro.org>
+ *
+ * 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 <guodong.xu@...aro.org>");
+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 <guodong.xu@...aro.org>
+ *
+ * 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
--
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