mfd: RK808: Add new mfd driver for RK808

The RK808 chip is a power management IC for multimedia and handheld
devices. It contains the following components:

- Regulators
- RTC
- Clkout

The RK808 core driver is registered as a platform driver and provides
communication through I2C with the host device for the different
components.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Zhang Qing <zhangqing@rock-chips.com>
Tested-by: Heiko <heiko@sntech.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 259 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 82f70dcab136..049796a28215 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -597,6 +597,19 @@ config MFD_RC5T583
           Additional drivers must be enabled in order to use the
           different functionality of the device.
 
+config MFD_RK808
+        tristate "Rockchip RK808 Power Management chip"
+        depends on I2C && OF
+        select MFD_CORE
+        select REGMAP_I2C
+        select REGMAP_IRQ
+        help
+          If you say yes here you get support for the RK808
+          Power Management chips.
+          This driver provides common support for accessing the device
+          through I2C interface. The device supports multiple sub-devices
+          including interrupts, RTC, LDO & DCDC regulators, and onkey.
+
 config MFD_RN5T618
         tristate "Ricoh RN5T5618 PMIC"
         depends on I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index aa5a73a5ba47..bd111213bd58 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_MFD_INTEL_MSIC)	+= intel_msic.o
 obj-$(CONFIG_MFD_PALMAS)        += palmas.o
 obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_RC5T583)       += rc5t583.o rc5t583-irq.o
+obj-$(CONFIG_MFD_RK808)         += rk808.o
 obj-$(CONFIG_MFD_RN5T618)       += rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)      += sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)        += syscon.o
diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
new file mode 100644
index 000000000000..0324422b3b10
--- /dev/null
+++ b/drivers/mfd/rk808.c
@@ -0,0 +1,245 @@
+/*
+ * MFD core driver for Rockchip RK808
+ *
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Chris Zhong <zyw@rock-chips.com>
+ * Author: Zhang Qing <zhangqing@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/rk808.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+struct rk808_reg_data {
+        int addr;
+        int mask;
+        int value;
+};
+
+static const struct regmap_config rk808_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .max_register = RK808_IO_POL_REG,
+};
+
+static struct resource rtc_resources[] = {
+        {
+                .start  = RK808_IRQ_RTC_ALARM,
+                .end    = RK808_IRQ_RTC_ALARM,
+                .flags  = IORESOURCE_IRQ,
+        }
+};
+
+static const struct mfd_cell rk808s[] = {
+        { .name = "rk808-clkout", },
+        { .name = "rk808-regulator", },
+        {
+                .name = "rk808-rtc",
+                .num_resources = ARRAY_SIZE(rtc_resources),
+                .resources = &rtc_resources[0],
+        },
+};
+
+static const struct rk808_reg_data pre_init_reg[] = {
+        { RK808_BUCK3_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_150MA },
+        { RK808_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_200MA },
+        { RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
+        { RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK,  BUCK_ILMIN_200MA },
+        { RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_200MA },
+        { RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
+                                                    VB_LO_SEL_3500MV },
+};
+
+static const struct regmap_irq rk808_irqs[] = {
+        /* INT_STS */
+        [RK808_IRQ_VOUT_LO] = {
+                .mask = RK808_IRQ_VOUT_LO_MSK,
+                .reg_offset = 0,
+        },
+        [RK808_IRQ_VB_LO] = {
+                .mask = RK808_IRQ_VB_LO_MSK,
+                .reg_offset = 0,
+        },
+        [RK808_IRQ_PWRON] = {
+                .mask = RK808_IRQ_PWRON_MSK,
+                .reg_offset = 0,
+        },
+        [RK808_IRQ_PWRON_LP] = {
+                .mask = RK808_IRQ_PWRON_LP_MSK,
+                .reg_offset = 0,
+        },
+        [RK808_IRQ_HOTDIE] = {
+                .mask = RK808_IRQ_HOTDIE_MSK,
+                .reg_offset = 0,
+        },
+        [RK808_IRQ_RTC_ALARM] = {
+                .mask = RK808_IRQ_RTC_ALARM_MSK,
+                .reg_offset = 0,
+        },
+        [RK808_IRQ_RTC_PERIOD] = {
+                .mask = RK808_IRQ_RTC_PERIOD_MSK,
+                .reg_offset = 0,
+        },
+
+        /* INT_STS2 */
+        [RK808_IRQ_PLUG_IN_INT] = {
+                .mask = RK808_IRQ_PLUG_IN_INT_MSK,
+                .reg_offset = 1,
+        },
+        [RK808_IRQ_PLUG_OUT_INT] = {
+                .mask = RK808_IRQ_PLUG_OUT_INT_MSK,
+                .reg_offset = 1,
+        },
+};
+
+static struct regmap_irq_chip rk808_irq_chip = {
+        .name = "rk808",
+        .irqs = rk808_irqs,
+        .num_irqs = ARRAY_SIZE(rk808_irqs),
+        .num_regs = 2,
+        .irq_reg_stride = 2,
+        .status_base = RK808_INT_STS_REG1,
+        .mask_base = RK808_INT_STS_MSK_REG1,
+        .ack_base = RK808_INT_STS_REG1,
+        .init_ack_masked = true,
+};
+
+static struct i2c_client *rk808_i2c_client;
+static void rk808_device_shutdown(void)
+{
+        int ret;
+        struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
+
+        if (!rk808) {
+                dev_warn(&rk808_i2c_client->dev,
+                         "have no rk808, so do nothing here\n");
+                return;
+        }
+
+        ret = regmap_update_bits(rk808->regmap,
+                                 RK808_DEVCTRL_REG,
+                                 DEV_OFF_RST, DEV_OFF_RST);
+        if (ret)
+                dev_err(&rk808_i2c_client->dev, "power off error!\n");
+}
+
+static int rk808_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+        struct device_node *np = client->dev.of_node;
+        struct rk808 *rk808;
+        int pm_off = 0;
+        int ret;
+        int i;
+
+        if (!client->irq) {
+                dev_err(&client->dev, "No interrupt support, no core IRQ\n");
+                return -EINVAL;
+        }
+
+        rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
+        if (!rk808)
+                return -ENOMEM;
+
+        rk808->regmap = devm_regmap_init_i2c(client, &rk808_regmap_config);
+        if (IS_ERR(rk808->regmap)) {
+                dev_err(&client->dev, "regmap initialization failed\n");
+                return PTR_ERR(rk808->regmap);
+        }
+
+        for (i = 0; i < ARRAY_SIZE(pre_init_reg); i++) {
+                ret = regmap_update_bits(rk808->regmap, pre_init_reg[i].addr,
+                                         pre_init_reg[i].mask,
+                                         pre_init_reg[i].value);
+                if (ret) {
+                        dev_err(&client->dev,
+                                "0x%x write err\n", pre_init_reg[i].addr);
+                        return ret;
+                }
+        }
+
+        ret = regmap_add_irq_chip(rk808->regmap, client->irq,
+                                  IRQF_ONESHOT, -1,
+                                  &rk808_irq_chip, &rk808->irq_data);
+        if (ret) {
+                dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
+                return ret;
+        }
+
+        rk808->i2c = client;
+        i2c_set_clientdata(client, rk808);
+
+        ret = mfd_add_devices(&client->dev, -1,
+                              rk808s, ARRAY_SIZE(rk808s),
+                              NULL, 0, regmap_irq_get_domain(rk808->irq_data));
+        if (ret) {
+                dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
+                goto err_irq;
+        }
+
+        pm_off = of_property_read_bool(np,
+                                "rockchip,system-power-controller");
+        if (pm_off && !pm_power_off) {
+                rk808_i2c_client = client;
+                pm_power_off = rk808_device_shutdown;
+        }
+
+        return 0;
+
+err_irq:
+        regmap_del_irq_chip(client->irq, rk808->irq_data);
+        return ret;
+}
+
+static int rk808_remove(struct i2c_client *client)
+{
+        struct rk808 *rk808 = i2c_get_clientdata(client);
+
+        regmap_del_irq_chip(client->irq, rk808->irq_data);
+        mfd_remove_devices(&client->dev);
+        pm_power_off = NULL;
+
+        return 0;
+}
+
+static struct of_device_id rk808_of_match[] = {
+        { .compatible = "rockchip,rk808" },
+        { },
+};
+MODULE_DEVICE_TABLE(of, rk808_of_match);
+
+static const struct i2c_device_id rk808_ids[] = {
+        { "rk808" },
+        { },
+};
+MODULE_DEVICE_TABLE(i2c, rk808_ids);
+
+static struct i2c_driver rk808_i2c_driver = {
+        .driver = {
+                .name = "rk808",
+                .of_match_table = rk808_of_match,
+        },
+        .probe    = rk808_probe,
+        .remove   = rk808_remove,
+        .id_table = rk808_ids,
+};
+
+module_i2c_driver(rk808_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
+MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
+MODULE_DESCRIPTION("RK808 PMIC driver");