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linux-next/drivers/mfd/da9062-core.c
Steve Twiss bf742a53ce mfd: da9062: Fix missing volatile registers in the core regmap_range volatile lists 
Add an updated set of registers listed in the core regmap_range volatile
ranges defined for the DA9062.

These new registers contain bits that cannot be considered under the full
control of software. Under various conditions the hardware will set and/or
automatically clear bit(s) contained in these registers.

When using a cached version of regmap, the volatility of these registers must
be identified otherwise the regmap operations may not ensure the registers
are explicitly altered.

As well as updating the list of volatile registers, this change will fix a
corner case discovered in the DA9063 ONKEY which is used by the DA9062 core.

In the ONKEY case, the CONTROL_B register is now listed as volatile in the
regmap_range because it contains the bit field NONKEY_LOCK. This bit can be
altered by hardware, in which case regmap must be notified of its ability
to be manpiulated outside of software control.

Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2016-03-16 08:50:27 +00:00

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/*
* Core, IRQ and I2C device driver for DA9062 PMIC
* Copyright (C) 2015 Dialog Semiconductor Ltd.
*
* 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 <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/i2c.h>
#include <linux/mfd/da9062/core.h>
#include <linux/mfd/da9062/registers.h>
#include <linux/regulator/of_regulator.h>
#define DA9062_REG_EVENT_A_OFFSET 0
#define DA9062_REG_EVENT_B_OFFSET 1
#define DA9062_REG_EVENT_C_OFFSET 2
static struct regmap_irq da9062_irqs[] = {
/* EVENT A */
[DA9062_IRQ_ONKEY] = {
.reg_offset = DA9062_REG_EVENT_A_OFFSET,
.mask = DA9062AA_M_NONKEY_MASK,
},
[DA9062_IRQ_ALARM] = {
.reg_offset = DA9062_REG_EVENT_A_OFFSET,
.mask = DA9062AA_M_ALARM_MASK,
},
[DA9062_IRQ_TICK] = {
.reg_offset = DA9062_REG_EVENT_A_OFFSET,
.mask = DA9062AA_M_TICK_MASK,
},
[DA9062_IRQ_WDG_WARN] = {
.reg_offset = DA9062_REG_EVENT_A_OFFSET,
.mask = DA9062AA_M_WDG_WARN_MASK,
},
[DA9062_IRQ_SEQ_RDY] = {
.reg_offset = DA9062_REG_EVENT_A_OFFSET,
.mask = DA9062AA_M_SEQ_RDY_MASK,
},
/* EVENT B */
[DA9062_IRQ_TEMP] = {
.reg_offset = DA9062_REG_EVENT_B_OFFSET,
.mask = DA9062AA_M_TEMP_MASK,
},
[DA9062_IRQ_LDO_LIM] = {
.reg_offset = DA9062_REG_EVENT_B_OFFSET,
.mask = DA9062AA_M_LDO_LIM_MASK,
},
[DA9062_IRQ_DVC_RDY] = {
.reg_offset = DA9062_REG_EVENT_B_OFFSET,
.mask = DA9062AA_M_DVC_RDY_MASK,
},
[DA9062_IRQ_VDD_WARN] = {
.reg_offset = DA9062_REG_EVENT_B_OFFSET,
.mask = DA9062AA_M_VDD_WARN_MASK,
},
/* EVENT C */
[DA9062_IRQ_GPI0] = {
.reg_offset = DA9062_REG_EVENT_C_OFFSET,
.mask = DA9062AA_M_GPI0_MASK,
},
[DA9062_IRQ_GPI1] = {
.reg_offset = DA9062_REG_EVENT_C_OFFSET,
.mask = DA9062AA_M_GPI1_MASK,
},
[DA9062_IRQ_GPI2] = {
.reg_offset = DA9062_REG_EVENT_C_OFFSET,
.mask = DA9062AA_M_GPI2_MASK,
},
[DA9062_IRQ_GPI3] = {
.reg_offset = DA9062_REG_EVENT_C_OFFSET,
.mask = DA9062AA_M_GPI3_MASK,
},
[DA9062_IRQ_GPI4] = {
.reg_offset = DA9062_REG_EVENT_C_OFFSET,
.mask = DA9062AA_M_GPI4_MASK,
},
};
static struct regmap_irq_chip da9062_irq_chip = {
.name = "da9062-irq",
.irqs = da9062_irqs,
.num_irqs = DA9062_NUM_IRQ,
.num_regs = 3,
.status_base = DA9062AA_EVENT_A,
.mask_base = DA9062AA_IRQ_MASK_A,
.ack_base = DA9062AA_EVENT_A,
};
static struct resource da9062_core_resources[] = {
DEFINE_RES_NAMED(DA9062_IRQ_VDD_WARN, 1, "VDD_WARN", IORESOURCE_IRQ),
};
static struct resource da9062_regulators_resources[] = {
DEFINE_RES_NAMED(DA9062_IRQ_LDO_LIM, 1, "LDO_LIM", IORESOURCE_IRQ),
};
static struct resource da9062_thermal_resources[] = {
DEFINE_RES_NAMED(DA9062_IRQ_TEMP, 1, "THERMAL", IORESOURCE_IRQ),
};
static struct resource da9062_wdt_resources[] = {
DEFINE_RES_NAMED(DA9062_IRQ_WDG_WARN, 1, "WD_WARN", IORESOURCE_IRQ),
};
static struct resource da9062_rtc_resources[] = {
DEFINE_RES_NAMED(DA9062_IRQ_ALARM, 1, "ALARM", IORESOURCE_IRQ),
DEFINE_RES_NAMED(DA9062_IRQ_TICK, 1, "TICK", IORESOURCE_IRQ),
};
static struct resource da9062_onkey_resources[] = {
DEFINE_RES_NAMED(DA9062_IRQ_ONKEY, 1, "ONKEY", IORESOURCE_IRQ),
};
static const struct mfd_cell da9062_devs[] = {
{
.name = "da9062-core",
.num_resources = ARRAY_SIZE(da9062_core_resources),
.resources = da9062_core_resources,
},
{
.name = "da9062-regulators",
.num_resources = ARRAY_SIZE(da9062_regulators_resources),
.resources = da9062_regulators_resources,
},
{
.name = "da9062-watchdog",
.num_resources = ARRAY_SIZE(da9062_wdt_resources),
.resources = da9062_wdt_resources,
.of_compatible = "dlg,da9062-wdt",
},
{
.name = "da9062-thermal",
.num_resources = ARRAY_SIZE(da9062_thermal_resources),
.resources = da9062_thermal_resources,
.of_compatible = "dlg,da9062-thermal",
},
{
.name = "da9062-rtc",
.num_resources = ARRAY_SIZE(da9062_rtc_resources),
.resources = da9062_rtc_resources,
.of_compatible = "dlg,da9062-rtc",
},
{
.name = "da9062-onkey",
.num_resources = ARRAY_SIZE(da9062_onkey_resources),
.resources = da9062_onkey_resources,
.of_compatible = "dlg,da9062-onkey",
},
};
static int da9062_clear_fault_log(struct da9062 *chip)
{
int ret;
int fault_log;
ret = regmap_read(chip->regmap, DA9062AA_FAULT_LOG, &fault_log);
if (ret < 0)
return ret;
if (fault_log) {
if (fault_log & DA9062AA_TWD_ERROR_MASK)
dev_dbg(chip->dev, "Fault log entry detected: TWD_ERROR\n");
if (fault_log & DA9062AA_POR_MASK)
dev_dbg(chip->dev, "Fault log entry detected: POR\n");
if (fault_log & DA9062AA_VDD_FAULT_MASK)
dev_dbg(chip->dev, "Fault log entry detected: VDD_FAULT\n");
if (fault_log & DA9062AA_VDD_START_MASK)
dev_dbg(chip->dev, "Fault log entry detected: VDD_START\n");
if (fault_log & DA9062AA_TEMP_CRIT_MASK)
dev_dbg(chip->dev, "Fault log entry detected: TEMP_CRIT\n");
if (fault_log & DA9062AA_KEY_RESET_MASK)
dev_dbg(chip->dev, "Fault log entry detected: KEY_RESET\n");
if (fault_log & DA9062AA_NSHUTDOWN_MASK)
dev_dbg(chip->dev, "Fault log entry detected: NSHUTDOWN\n");
if (fault_log & DA9062AA_WAIT_SHUT_MASK)
dev_dbg(chip->dev, "Fault log entry detected: WAIT_SHUT\n");
ret = regmap_write(chip->regmap, DA9062AA_FAULT_LOG,
fault_log);
}
return ret;
}
static int da9062_get_device_type(struct da9062 *chip)
{
int device_id, variant_id, variant_mrc;
int ret;
ret = regmap_read(chip->regmap, DA9062AA_DEVICE_ID, &device_id);
if (ret < 0) {
dev_err(chip->dev, "Cannot read chip ID.\n");
return -EIO;
}
if (device_id != DA9062_PMIC_DEVICE_ID) {
dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
return -ENODEV;
}
ret = regmap_read(chip->regmap, DA9062AA_VARIANT_ID, &variant_id);
if (ret < 0) {
dev_err(chip->dev, "Cannot read chip variant id.\n");
return -EIO;
}
dev_info(chip->dev,
"Device detected (device-ID: 0x%02X, var-ID: 0x%02X)\n",
device_id, variant_id);
variant_mrc = (variant_id & DA9062AA_MRC_MASK) >> DA9062AA_MRC_SHIFT;
if (variant_mrc < DA9062_PMIC_VARIANT_MRC_AA) {
dev_err(chip->dev,
"Cannot support variant MRC: 0x%02X\n", variant_mrc);
return -ENODEV;
}
return ret;
}
static const struct regmap_range da9062_aa_readable_ranges[] = {
{
.range_min = DA9062AA_PAGE_CON,
.range_max = DA9062AA_STATUS_B,
}, {
.range_min = DA9062AA_STATUS_D,
.range_max = DA9062AA_EVENT_C,
}, {
.range_min = DA9062AA_IRQ_MASK_A,
.range_max = DA9062AA_IRQ_MASK_C,
}, {
.range_min = DA9062AA_CONTROL_A,
.range_max = DA9062AA_GPIO_4,
}, {
.range_min = DA9062AA_GPIO_WKUP_MODE,
.range_max = DA9062AA_BUCK4_CONT,
}, {
.range_min = DA9062AA_BUCK3_CONT,
.range_max = DA9062AA_BUCK3_CONT,
}, {
.range_min = DA9062AA_LDO1_CONT,
.range_max = DA9062AA_LDO4_CONT,
}, {
.range_min = DA9062AA_DVC_1,
.range_max = DA9062AA_DVC_1,
}, {
.range_min = DA9062AA_COUNT_S,
.range_max = DA9062AA_SECOND_D,
}, {
.range_min = DA9062AA_SEQ,
.range_max = DA9062AA_ID_4_3,
}, {
.range_min = DA9062AA_ID_12_11,
.range_max = DA9062AA_ID_16_15,
}, {
.range_min = DA9062AA_ID_22_21,
.range_max = DA9062AA_ID_32_31,
}, {
.range_min = DA9062AA_SEQ_A,
.range_max = DA9062AA_BUCK3_CFG,
}, {
.range_min = DA9062AA_VBUCK2_A,
.range_max = DA9062AA_VBUCK4_A,
}, {
.range_min = DA9062AA_VBUCK3_A,
.range_max = DA9062AA_VBUCK3_A,
}, {
.range_min = DA9062AA_VLDO1_A,
.range_max = DA9062AA_VLDO4_A,
}, {
.range_min = DA9062AA_VBUCK2_B,
.range_max = DA9062AA_VBUCK4_B,
}, {
.range_min = DA9062AA_VBUCK3_B,
.range_max = DA9062AA_VBUCK3_B,
}, {
.range_min = DA9062AA_VLDO1_B,
.range_max = DA9062AA_VLDO4_B,
}, {
.range_min = DA9062AA_BBAT_CONT,
.range_max = DA9062AA_BBAT_CONT,
}, {
.range_min = DA9062AA_INTERFACE,
.range_max = DA9062AA_CONFIG_E,
}, {
.range_min = DA9062AA_CONFIG_G,
.range_max = DA9062AA_CONFIG_K,
}, {
.range_min = DA9062AA_CONFIG_M,
.range_max = DA9062AA_CONFIG_M,
}, {
.range_min = DA9062AA_TRIM_CLDR,
.range_max = DA9062AA_GP_ID_19,
}, {
.range_min = DA9062AA_DEVICE_ID,
.range_max = DA9062AA_CONFIG_ID,
},
};
static const struct regmap_range da9062_aa_writeable_ranges[] = {
{
.range_min = DA9062AA_PAGE_CON,
.range_max = DA9062AA_PAGE_CON,
}, {
.range_min = DA9062AA_FAULT_LOG,
.range_max = DA9062AA_EVENT_C,
}, {
.range_min = DA9062AA_IRQ_MASK_A,
.range_max = DA9062AA_IRQ_MASK_C,
}, {
.range_min = DA9062AA_CONTROL_A,
.range_max = DA9062AA_GPIO_4,
}, {
.range_min = DA9062AA_GPIO_WKUP_MODE,
.range_max = DA9062AA_BUCK4_CONT,
}, {
.range_min = DA9062AA_BUCK3_CONT,
.range_max = DA9062AA_BUCK3_CONT,
}, {
.range_min = DA9062AA_LDO1_CONT,
.range_max = DA9062AA_LDO4_CONT,
}, {
.range_min = DA9062AA_DVC_1,
.range_max = DA9062AA_DVC_1,
}, {
.range_min = DA9062AA_COUNT_S,
.range_max = DA9062AA_ALARM_Y,
}, {
.range_min = DA9062AA_SEQ,
.range_max = DA9062AA_ID_4_3,
}, {
.range_min = DA9062AA_ID_12_11,
.range_max = DA9062AA_ID_16_15,
}, {
.range_min = DA9062AA_ID_22_21,
.range_max = DA9062AA_ID_32_31,
}, {
.range_min = DA9062AA_SEQ_A,
.range_max = DA9062AA_BUCK3_CFG,
}, {
.range_min = DA9062AA_VBUCK2_A,
.range_max = DA9062AA_VBUCK4_A,
}, {
.range_min = DA9062AA_VBUCK3_A,
.range_max = DA9062AA_VBUCK3_A,
}, {
.range_min = DA9062AA_VLDO1_A,
.range_max = DA9062AA_VLDO4_A,
}, {
.range_min = DA9062AA_VBUCK2_B,
.range_max = DA9062AA_VBUCK4_B,
}, {
.range_min = DA9062AA_VBUCK3_B,
.range_max = DA9062AA_VBUCK3_B,
}, {
.range_min = DA9062AA_VLDO1_B,
.range_max = DA9062AA_VLDO4_B,
}, {
.range_min = DA9062AA_BBAT_CONT,
.range_max = DA9062AA_BBAT_CONT,
}, {
.range_min = DA9062AA_GP_ID_0,
.range_max = DA9062AA_GP_ID_19,
},
};
static const struct regmap_range da9062_aa_volatile_ranges[] = {
{
.range_min = DA9062AA_PAGE_CON,
.range_max = DA9062AA_STATUS_B,
}, {
.range_min = DA9062AA_STATUS_D,
.range_max = DA9062AA_EVENT_C,
}, {
.range_min = DA9062AA_CONTROL_A,
.range_max = DA9062AA_CONTROL_B,
}, {
.range_min = DA9062AA_CONTROL_E,
.range_max = DA9062AA_CONTROL_F,
}, {
.range_min = DA9062AA_BUCK2_CONT,
.range_max = DA9062AA_BUCK4_CONT,
}, {
.range_min = DA9062AA_BUCK3_CONT,
.range_max = DA9062AA_BUCK3_CONT,
}, {
.range_min = DA9062AA_LDO1_CONT,
.range_max = DA9062AA_LDO4_CONT,
}, {
.range_min = DA9062AA_DVC_1,
.range_max = DA9062AA_DVC_1,
}, {
.range_min = DA9062AA_COUNT_S,
.range_max = DA9062AA_SECOND_D,
}, {
.range_min = DA9062AA_SEQ,
.range_max = DA9062AA_SEQ,
}, {
.range_min = DA9062AA_EN_32K,
.range_max = DA9062AA_EN_32K,
},
};
static const struct regmap_access_table da9062_aa_readable_table = {
.yes_ranges = da9062_aa_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9062_aa_readable_ranges),
};
static const struct regmap_access_table da9062_aa_writeable_table = {
.yes_ranges = da9062_aa_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9062_aa_writeable_ranges),
};
static const struct regmap_access_table da9062_aa_volatile_table = {
.yes_ranges = da9062_aa_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(da9062_aa_volatile_ranges),
};
static const struct regmap_range_cfg da9062_range_cfg[] = {
{
.range_min = DA9062AA_PAGE_CON,
.range_max = DA9062AA_CONFIG_ID,
.selector_reg = DA9062AA_PAGE_CON,
.selector_mask = 1 << DA9062_I2C_PAGE_SEL_SHIFT,
.selector_shift = DA9062_I2C_PAGE_SEL_SHIFT,
.window_start = 0,
.window_len = 256,
}
};
static struct regmap_config da9062_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.ranges = da9062_range_cfg,
.num_ranges = ARRAY_SIZE(da9062_range_cfg),
.max_register = DA9062AA_CONFIG_ID,
.cache_type = REGCACHE_RBTREE,
.rd_table = &da9062_aa_readable_table,
.wr_table = &da9062_aa_writeable_table,
.volatile_table = &da9062_aa_volatile_table,
};
static int da9062_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct da9062 *chip;
unsigned int irq_base;
int ret;
chip = devm_kzalloc(&i2c->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
i2c_set_clientdata(i2c, chip);
chip->dev = &i2c->dev;
if (!i2c->irq) {
dev_err(chip->dev, "No IRQ configured\n");
return -EINVAL;
}
chip->regmap = devm_regmap_init_i2c(i2c, &da9062_regmap_config);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
dev_err(chip->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
ret = da9062_clear_fault_log(chip);
if (ret < 0)
dev_warn(chip->dev, "Cannot clear fault log\n");
ret = da9062_get_device_type(chip);
if (ret)
return ret;
ret = regmap_add_irq_chip(chip->regmap, i2c->irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
-1, &da9062_irq_chip,
&chip->regmap_irq);
if (ret) {
dev_err(chip->dev, "Failed to request IRQ %d: %d\n",
i2c->irq, ret);
return ret;
}
irq_base = regmap_irq_chip_get_base(chip->regmap_irq);
ret = mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, da9062_devs,
ARRAY_SIZE(da9062_devs), NULL, irq_base,
NULL);
if (ret) {
dev_err(chip->dev, "Cannot register child devices\n");
regmap_del_irq_chip(i2c->irq, chip->regmap_irq);
return ret;
}
return ret;
}
static int da9062_i2c_remove(struct i2c_client *i2c)
{
struct da9062 *chip = i2c_get_clientdata(i2c);
mfd_remove_devices(chip->dev);
regmap_del_irq_chip(i2c->irq, chip->regmap_irq);
return 0;
}
static const struct i2c_device_id da9062_i2c_id[] = {
{ "da9062", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, da9062_i2c_id);
static const struct of_device_id da9062_dt_ids[] = {
{ .compatible = "dlg,da9062", },
{ }
};
MODULE_DEVICE_TABLE(of, da9062_dt_ids);
static struct i2c_driver da9062_i2c_driver = {
.driver = {
.name = "da9062",
.of_match_table = of_match_ptr(da9062_dt_ids),
},
.probe = da9062_i2c_probe,
.remove = da9062_i2c_remove,
.id_table = da9062_i2c_id,
};
module_i2c_driver(da9062_i2c_driver);
MODULE_DESCRIPTION("Core device driver for Dialog DA9062");
MODULE_AUTHOR("Steve Twiss <stwiss.opensource@diasemi.com>");
MODULE_LICENSE("GPL");
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