From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z6z31-0002Rz-0J for barebox@lists.infradead.org; Mon, 22 Jun 2015 10:33:56 +0000 From: Juergen Borleis Date: Mon, 22 Jun 2015 12:33:24 +0200 Message-Id: <1434969204-11433-7-git-send-email-jbe@pengutronix.de> In-Reply-To: <1434969204-11433-1-git-send-email-jbe@pengutronix.de> References: <1434969204-11433-1-git-send-email-jbe@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 6/6] MFD/DA9053: da9053: add basic da9053 driver To: barebox@lists.infradead.org Signed-off-by: Jan Luebbe Signed-off-by: Juergen Borleis --- drivers/mfd/Kconfig | 8 ++ drivers/mfd/Makefile | 1 + drivers/mfd/da9053.c | 336 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 345 insertions(+) create mode 100644 drivers/mfd/da9053.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3af904d..6ec66ac 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -4,6 +4,14 @@ config MFD_ACT8846 depends on I2C bool "ACT8846 driver" +config MFD_DA9053 + depends on I2C + bool "DA9053 PMIC driver" + help + This power management controller provides configureable power supplies, + a machine restart feature and a watchdog which are effective machine + wide. + config MFD_LP3972 depends on I2C bool "LP3972 driver" diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 49b9e35..2899dde 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_MFD_ACT8846) += act8846.o +obj-$(CONFIG_MFD_DA9053) += da9053.o obj-$(CONFIG_MFD_LP3972) += lp3972.o obj-$(CONFIG_MFD_MC13XXX) += mc13xxx.o obj-$(CONFIG_MFD_MC34704) += mc34704.o diff --git a/drivers/mfd/da9053.c b/drivers/mfd/da9053.c new file mode 100644 index 0000000..601458d --- /dev/null +++ b/drivers/mfd/da9053.c @@ -0,0 +1,336 @@ +/* + * Copyright (C) 2013 Jan Luebbe + * + * 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. + * + * + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define DRIVERNAME "da9053" + +/* STATUS REGISTERS */ +#define DA9053_STATUS_A_REG 1 +#define DA9053_STATUS_B_REG 2 +#define DA9053_STATUS_C_REG 3 +#define DA9053_STATUS_D_REG 4 + +/* PARK REGISTER */ +#define DA9053_PARK_REGISTER DA9053_STATUS_D_REG + +/* EVENT REGISTERS */ +#define DA9053_EVENT_A_REG 5 +#define DA9053_EVENT_B_REG 6 +#define DA9053_EVENT_C_REG 7 +#define DA9053_EVENT_D_REG 8 +#define DA9053_FAULTLOG_REG 9 + +/* IRQ REGISTERS */ +#define DA9053_IRQ_MASK_A_REG 10 +#define DA9053_IRQ_MASK_B_REG 11 +#define DA9053_IRQ_MASK_C_REG 12 +#define DA9053_IRQ_MASK_D_REG 13 + +/* CONTROL REGISTERS */ +#define DA9053_CONTROL_A_REG 14 +#define DA9053_CONTROL_B_REG 15 +#define DA9053_CONTROL_C_REG 16 +#define DA9053_CONTROL_D_REG 17 + +#define DA9053_PDDIS_REG 18 +#define DA9053_INTERFACE_REG 19 +#define DA9053_RESET_REG 20 + +/* FAULT LOG REGISTER BITS */ +#define DA9053_FAULTLOG_WAITSET 0X80 +#define DA9053_FAULTLOG_NSDSET 0X40 +#define DA9053_FAULTLOG_KEYSHUT 0X20 +#define DA9053_FAULTLOG_TEMPOVER 0X08 +#define DA9053_FAULTLOG_VDDSTART 0X04 +#define DA9053_FAULTLOG_VDDFAULT 0X02 +#define DA9053_FAULTLOG_TWDERROR 0X01 + +/* CONTROL REGISTER B BITS */ +#define DA9053_CONTROLB_SHUTDOWN 0X80 +#define DA9053_CONTROLB_DEEPSLEEP 0X40 +#define DA9053_CONTROLB_WRITEMODE 0X20 +#define DA9053_CONTROLB_BBATEN 0X10 +#define DA9053_CONTROLB_OTPREADEN 0X08 +#define DA9053_CONTROLB_AUTOBOOT 0X04 +#define DA9053_CONTROLB_ACTDIODE 0X02 +#define DA9053_CONTROLB_BUCKMERGE 0X01 + +/* CONTROL REGISTER D BITS */ +#define DA9053_CONTROLD_WATCHDOG 0X80 +#define DA9053_CONTROLD_ACCDETEN 0X40 +#define DA9053_CONTROLD_GPI1415SD 0X20 +#define DA9053_CONTROLD_NONKEYSD 0X10 +#define DA9053_CONTROLD_KEEPACTEN 0X08 +#define DA9053_CONTROLD_TWDSCALE 0X07 + +struct da9053_priv { + struct cdev cdev; + struct watchdog wd; + struct i2c_client *client; +}; + +#define cdev_to_da9053_priv(x) container_of(x, struct da9053_priv, cdev) +#define wd_to_da9053_priv(x) container_of(x, struct da9053_priv, wd) + +static int da9053_reg_read(struct da9053_priv *da9053, u32 reg, u8 *val) +{ + int ret; + + ret = i2c_read_reg(da9053->client, reg, val, 1); + + return ret == 1 ? 0 : ret; +} + +static int da9053_reg_write(struct da9053_priv *da9053, u32 reg, u8 val) +{ + int ret; + + ret = i2c_write_reg(da9053->client, reg, &val, 1); + + return ret == 1 ? 0 : ret; +} + +static int da9053_park(struct da9053_priv *da9053) +{ + int ret; + u8 val; + + ret = i2c_read_reg(da9053->client, DA9053_PARK_REGISTER, &val, 1); + + return ret == 1 ? 0 : ret; +} + +static ssize_t da9053_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags) +{ + struct da9053_priv *da9053 = cdev_to_da9053_priv(cdev); + u8 *buf = _buf; + size_t i = count; + int err; + + while (i) { + err = da9053_reg_read(da9053, offset, buf); + if (err) { + da9053_park(da9053); + return (ssize_t)err; + } + buf++; + i--; + offset++; + } + + if (da9053_park(da9053) < 0) + return -EIO; + + return count; +} + +static int da9053_enable_multiwrite(struct da9053_priv *da9053) +{ + int ret; + u8 val; + + ret = da9053_reg_read(da9053, DA9053_CONTROL_B_REG, &val); + if (ret < 0) + return ret; + + if (val & DA9053_CONTROLB_WRITEMODE) { + val &= ~DA9053_CONTROLB_WRITEMODE; + ret = da9053_reg_write(da9053, DA9053_CONTROL_B_REG, val); + if (ret < 0) + return ret; + } + + ret = da9053_park(da9053); + if (ret < 0) + return ret; + + return 0; +} + +static struct file_operations da9053_fops = { + .lseek = dev_lseek_default, + .read = da9053_read, +}; + +static int da9053_set_timeout(struct watchdog *wd, unsigned timeout) +{ + struct da9053_priv *da9053 = wd_to_da9053_priv(wd); + struct device_d *dev = da9053->cdev.dev; + unsigned scale = 0; + int ret; + u8 val; + + if (timeout > 131) + return -EINVAL; + + if (timeout) { + timeout *= 1000; /* convert to ms */ + scale = 0; + while (timeout > (2048 << scale) && scale <= 6) + scale++; + dev_dbg(dev, "calculated TWDSCALE=%u (req=%ims calc=%ims)\n", + scale, timeout, 2048 << scale); + scale++; /* scale 0 disables the WD */ + } + + ret = da9053_reg_read(da9053, DA9053_CONTROL_D_REG, &val); + if (ret < 0) + return ret; + + dev_dbg(dev, "read watchdog (val=0x%02x)\n", val); + + if (scale && scale == (val & DA9053_CONTROLD_TWDSCALE)) { + /* trigger WD */ + val |= DA9053_CONTROLD_WATCHDOG; + ret = da9053_reg_write(da9053, DA9053_CONTROL_D_REG, val); + if (ret < 0) + return ret; + dev_dbg(dev, "triggered watchdog (val=0x%02x)\n", val); + } else { + /* disable WD first */ + val &= ~DA9053_CONTROLD_TWDSCALE; + ret = da9053_reg_write(da9053, DA9053_CONTROL_D_REG, val); + if (ret < 0) + return ret; + + dev_dbg(dev, "disabled watchdog (val=0x%02x)\n", val); + if (scale) { + /* park before waiting */ + ret = da9053_park(da9053); + if (ret < 0) + return ret; + + /* wait required time */ + udelay(150); + + /* enable WD with new timeout */ + val |= scale; + ret = da9053_reg_write(da9053, DA9053_CONTROL_D_REG, val); + if (ret < 0) + return ret; + dev_dbg(dev, "enabled watchdog (val=0x%02x)\n", val); + } + } + + ret = da9053_park(da9053); + if (ret < 0) + return ret; + + return 0; +} + +static void da9053_detect_reset_source(struct da9053_priv *da9053) +{ + int ret; + u8 val; + + ret = da9053_reg_read(da9053, DA9053_FAULTLOG_REG, &val); + if (ret < 0) + return; + + ret = da9053_park(da9053); + if (ret < 0) + return; + + if (val & DA9053_FAULTLOG_TWDERROR) { + reset_source_set(RESET_WDG, FEATURE_SCOPE_MACHINE); + return; + } + + if (val & DA9053_FAULTLOG_VDDFAULT) { + reset_source_set(RESET_POR, FEATURE_SCOPE_MACHINE); + return; + } + + if (val & DA9053_FAULTLOG_NSDSET) { + reset_source_set(RESET_RST, FEATURE_SCOPE_MACHINE); + return; + } + + /* else keep the default 'unknown' state */ +} + +static void __noreturn da9053_force_system_reset(struct device_d *dev) +{ + struct da9053_priv *da9053 = dev->priv; + u8 val; + int ret; + + ret = da9053_reg_read(da9053, DA9053_CONTROL_B_REG, &val); + if (ret < 0) + hang(); + + val |= DA9053_CONTROLB_SHUTDOWN; + ret = da9053_reg_write(da9053, DA9053_CONTROL_B_REG, val); + if (ret < 0) + hang(); + + da9053_park(da9053); + + hang(); +} + +static int da9053_probe(struct device_d *dev) +{ + struct da9053_priv *da9053; + int ret; + + da9053 = xzalloc(sizeof(struct da9053_priv)); + dev->priv = da9053; + da9053->cdev.name = DRIVERNAME; + da9053->client = to_i2c_client(dev); + da9053->cdev.size = 128; + da9053->cdev.dev = dev; + da9053->cdev.ops = &da9053_fops; + da9053->wd.set_timeout = da9053_set_timeout; + + ret = da9053_enable_multiwrite(da9053); + if (ret < 0) + return ret; + + ret = watchdog_register(&da9053->wd, FEATURE_SCOPE_MACHINE); + if (ret) + return ret; + + da9053_detect_reset_source(da9053); + + restart_add_scope(da9053_force_system_reset, dev, FEATURE_SCOPE_MACHINE); + + return 0; +} + +static struct driver_d da9053_driver = { + .name = DRIVERNAME, + .probe = da9053_probe, +}; + +static int da9053_init(void) +{ + i2c_driver_register(&da9053_driver); + return 0; +} + +device_initcall(da9053_init); -- 2.1.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox