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linux_dsm_epyc7002/drivers/mfd/da9063-i2c.c
Hubert Streidl 14c7e3f5be mfd: da9063: Support SMBus and I2C mode 
[ Upstream commit 586478bfc9f7e16504d6f64cf18bcbdf6fd0cbc9 ]

By default the PMIC DA9063 2-wire interface is SMBus compliant. This
means the PMIC will automatically reset the interface when the clock
signal ceases for more than the SMBus timeout of 35 ms.

If the I2C driver / device is not capable of creating atomic I2C
transactions, a context change can cause a ceasing of the clock signal.
This can happen if for example a real-time thread is scheduled. Then
the DA9063 in SMBus mode will reset the 2-wire interface. Subsequently
a write message could end up in the wrong register. This could cause
unpredictable system behavior.

The DA9063 PMIC also supports an I2C compliant mode for the 2-wire
interface. This mode does not reset the interface when the clock
signal ceases. Thus the problem depicted above does not occur.

This patch tests for the bus functionality "I2C_FUNC_I2C". It can
reasonably be assumed that the bus cannot obey SMBus timings if
this functionality is set. SMBus commands most probably are emulated
in this case which is prone to the latency issue described above.

This patch enables the I2C bus mode if I2C_FUNC_I2C is set or
otherwise keeps the default SMBus mode.

Signed-off-by: Hubert Streidl <hubert.streidl@de.bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-11 14:47:31 +02:00

475 lines
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// SPDX-License-Identifier: GPL-2.0+
/* I2C support for Dialog DA9063
*
* Copyright 2012 Dialog Semiconductor Ltd.
* Copyright 2013 Philipp Zabel, Pengutronix
*
* Author: Krystian Garbaciak, Dialog Semiconductor
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/da9063/core.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/of.h>
#include <linux/regulator/of_regulator.h>
/*
* Raw I2C access required for just accessing chip and variant info before we
* know which device is present. The info read from the device using this
* approach is then used to select the correct regmap tables.
*/
#define DA9063_REG_PAGE_SIZE 0x100
#define DA9063_REG_PAGED_ADDR_MASK 0xFF
enum da9063_page_sel_buf_fmt {
DA9063_PAGE_SEL_BUF_PAGE_REG = 0,
DA9063_PAGE_SEL_BUF_PAGE_VAL,
DA9063_PAGE_SEL_BUF_SIZE,
};
enum da9063_paged_read_msgs {
DA9063_PAGED_READ_MSG_PAGE_SEL = 0,
DA9063_PAGED_READ_MSG_REG_SEL,
DA9063_PAGED_READ_MSG_DATA,
DA9063_PAGED_READ_MSG_CNT,
};
static int da9063_i2c_blockreg_read(struct i2c_client *client, u16 addr,
u8 *buf, int count)
{
struct i2c_msg xfer[DA9063_PAGED_READ_MSG_CNT];
u8 page_sel_buf[DA9063_PAGE_SEL_BUF_SIZE];
u8 page_num, paged_addr;
int ret;
/* Determine page info based on register address */
page_num = (addr / DA9063_REG_PAGE_SIZE);
if (page_num > 1) {
dev_err(&client->dev, "Invalid register address provided\n");
return -EINVAL;
}
paged_addr = (addr % DA9063_REG_PAGE_SIZE) & DA9063_REG_PAGED_ADDR_MASK;
page_sel_buf[DA9063_PAGE_SEL_BUF_PAGE_REG] = DA9063_REG_PAGE_CON;
page_sel_buf[DA9063_PAGE_SEL_BUF_PAGE_VAL] =
(page_num << DA9063_I2C_PAGE_SEL_SHIFT) & DA9063_REG_PAGE_MASK;
/* Write reg address, page selection */
xfer[DA9063_PAGED_READ_MSG_PAGE_SEL].addr = client->addr;
xfer[DA9063_PAGED_READ_MSG_PAGE_SEL].flags = 0;
xfer[DA9063_PAGED_READ_MSG_PAGE_SEL].len = DA9063_PAGE_SEL_BUF_SIZE;
xfer[DA9063_PAGED_READ_MSG_PAGE_SEL].buf = page_sel_buf;
/* Select register address */
xfer[DA9063_PAGED_READ_MSG_REG_SEL].addr = client->addr;
xfer[DA9063_PAGED_READ_MSG_REG_SEL].flags = 0;
xfer[DA9063_PAGED_READ_MSG_REG_SEL].len = sizeof(paged_addr);
xfer[DA9063_PAGED_READ_MSG_REG_SEL].buf = &paged_addr;
/* Read data */
xfer[DA9063_PAGED_READ_MSG_DATA].addr = client->addr;
xfer[DA9063_PAGED_READ_MSG_DATA].flags = I2C_M_RD;
xfer[DA9063_PAGED_READ_MSG_DATA].len = count;
xfer[DA9063_PAGED_READ_MSG_DATA].buf = buf;
ret = i2c_transfer(client->adapter, xfer, DA9063_PAGED_READ_MSG_CNT);
if (ret < 0) {
dev_err(&client->dev, "Paged block read failed: %d\n", ret);
return ret;
}
if (ret != DA9063_PAGED_READ_MSG_CNT) {
dev_err(&client->dev, "Paged block read failed to complete\n");
return -EIO;
}
return 0;
}
enum {
DA9063_DEV_ID_REG = 0,
DA9063_VAR_ID_REG,
DA9063_CHIP_ID_REGS,
};
static int da9063_get_device_type(struct i2c_client *i2c, struct da9063 *da9063)
{
u8 buf[DA9063_CHIP_ID_REGS];
int ret;
ret = da9063_i2c_blockreg_read(i2c, DA9063_REG_DEVICE_ID, buf,
DA9063_CHIP_ID_REGS);
if (ret)
return ret;
if (buf[DA9063_DEV_ID_REG] != PMIC_CHIP_ID_DA9063) {
dev_err(da9063->dev,
"Invalid chip device ID: 0x%02x\n",
buf[DA9063_DEV_ID_REG]);
return -ENODEV;
}
dev_info(da9063->dev,
"Device detected (chip-ID: 0x%02X, var-ID: 0x%02X)\n",
buf[DA9063_DEV_ID_REG], buf[DA9063_VAR_ID_REG]);
da9063->variant_code =
(buf[DA9063_VAR_ID_REG] & DA9063_VARIANT_ID_MRC_MASK)
>> DA9063_VARIANT_ID_MRC_SHIFT;
return 0;
}
/*
* Variant specific regmap configs
*/
static const struct regmap_range da9063_ad_readable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_AD_REG_SECOND_D),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_T_OFFSET, DA9063_AD_REG_GP_ID_19),
regmap_reg_range(DA9063_REG_DEVICE_ID, DA9063_REG_VARIANT_ID),
};
static const struct regmap_range da9063_ad_writeable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_PAGE_CON),
regmap_reg_range(DA9063_REG_FAULT_LOG, DA9063_REG_VSYS_MON),
regmap_reg_range(DA9063_REG_COUNT_S, DA9063_AD_REG_ALARM_Y),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_CONFIG_I, DA9063_AD_REG_MON_REG_4),
regmap_reg_range(DA9063_AD_REG_GP_ID_0, DA9063_AD_REG_GP_ID_19),
};
static const struct regmap_range da9063_ad_volatile_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_EVENT_D),
regmap_reg_range(DA9063_REG_CONTROL_A, DA9063_REG_CONTROL_B),
regmap_reg_range(DA9063_REG_CONTROL_E, DA9063_REG_CONTROL_F),
regmap_reg_range(DA9063_REG_BCORE2_CONT, DA9063_REG_LDO11_CONT),
regmap_reg_range(DA9063_REG_DVC_1, DA9063_REG_ADC_MAN),
regmap_reg_range(DA9063_REG_ADC_RES_L, DA9063_AD_REG_SECOND_D),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_SEQ),
regmap_reg_range(DA9063_REG_EN_32K, DA9063_REG_EN_32K),
regmap_reg_range(DA9063_AD_REG_MON_REG_5, DA9063_AD_REG_MON_REG_6),
};
static const struct regmap_access_table da9063_ad_readable_table = {
.yes_ranges = da9063_ad_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_ad_readable_ranges),
};
static const struct regmap_access_table da9063_ad_writeable_table = {
.yes_ranges = da9063_ad_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_ad_writeable_ranges),
};
static const struct regmap_access_table da9063_ad_volatile_table = {
.yes_ranges = da9063_ad_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_ad_volatile_ranges),
};
static const struct regmap_range da9063_bb_readable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_BB_REG_SECOND_D),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_T_OFFSET, DA9063_BB_REG_GP_ID_19),
regmap_reg_range(DA9063_REG_DEVICE_ID, DA9063_REG_VARIANT_ID),
};
static const struct regmap_range da9063_bb_writeable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_PAGE_CON),
regmap_reg_range(DA9063_REG_FAULT_LOG, DA9063_REG_VSYS_MON),
regmap_reg_range(DA9063_REG_COUNT_S, DA9063_BB_REG_ALARM_Y),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_CONFIG_I, DA9063_BB_REG_MON_REG_4),
regmap_reg_range(DA9063_BB_REG_GP_ID_0, DA9063_BB_REG_GP_ID_19),
};
static const struct regmap_range da9063_bb_da_volatile_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_EVENT_D),
regmap_reg_range(DA9063_REG_CONTROL_A, DA9063_REG_CONTROL_B),
regmap_reg_range(DA9063_REG_CONTROL_E, DA9063_REG_CONTROL_F),
regmap_reg_range(DA9063_REG_BCORE2_CONT, DA9063_REG_LDO11_CONT),
regmap_reg_range(DA9063_REG_DVC_1, DA9063_REG_ADC_MAN),
regmap_reg_range(DA9063_REG_ADC_RES_L, DA9063_BB_REG_SECOND_D),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_SEQ),
regmap_reg_range(DA9063_REG_EN_32K, DA9063_REG_EN_32K),
regmap_reg_range(DA9063_BB_REG_MON_REG_5, DA9063_BB_REG_MON_REG_6),
};
static const struct regmap_access_table da9063_bb_readable_table = {
.yes_ranges = da9063_bb_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_bb_readable_ranges),
};
static const struct regmap_access_table da9063_bb_writeable_table = {
.yes_ranges = da9063_bb_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_bb_writeable_ranges),
};
static const struct regmap_access_table da9063_bb_da_volatile_table = {
.yes_ranges = da9063_bb_da_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_bb_da_volatile_ranges),
};
static const struct regmap_range da9063l_bb_readable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_MON_A10_RES),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_T_OFFSET, DA9063_BB_REG_GP_ID_19),
regmap_reg_range(DA9063_REG_DEVICE_ID, DA9063_REG_VARIANT_ID),
};
static const struct regmap_range da9063l_bb_writeable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_PAGE_CON),
regmap_reg_range(DA9063_REG_FAULT_LOG, DA9063_REG_VSYS_MON),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_CONFIG_I, DA9063_BB_REG_MON_REG_4),
regmap_reg_range(DA9063_BB_REG_GP_ID_0, DA9063_BB_REG_GP_ID_19),
};
static const struct regmap_range da9063l_bb_da_volatile_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_EVENT_D),
regmap_reg_range(DA9063_REG_CONTROL_A, DA9063_REG_CONTROL_B),
regmap_reg_range(DA9063_REG_CONTROL_E, DA9063_REG_CONTROL_F),
regmap_reg_range(DA9063_REG_BCORE2_CONT, DA9063_REG_LDO11_CONT),
regmap_reg_range(DA9063_REG_DVC_1, DA9063_REG_ADC_MAN),
regmap_reg_range(DA9063_REG_ADC_RES_L, DA9063_REG_MON_A10_RES),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_SEQ),
regmap_reg_range(DA9063_REG_EN_32K, DA9063_REG_EN_32K),
regmap_reg_range(DA9063_BB_REG_MON_REG_5, DA9063_BB_REG_MON_REG_6),
};
static const struct regmap_access_table da9063l_bb_readable_table = {
.yes_ranges = da9063l_bb_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063l_bb_readable_ranges),
};
static const struct regmap_access_table da9063l_bb_writeable_table = {
.yes_ranges = da9063l_bb_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063l_bb_writeable_ranges),
};
static const struct regmap_access_table da9063l_bb_da_volatile_table = {
.yes_ranges = da9063l_bb_da_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063l_bb_da_volatile_ranges),
};
static const struct regmap_range da9063_da_readable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_BB_REG_SECOND_D),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_T_OFFSET, DA9063_BB_REG_GP_ID_11),
regmap_reg_range(DA9063_REG_DEVICE_ID, DA9063_REG_VARIANT_ID),
};
static const struct regmap_range da9063_da_writeable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_PAGE_CON),
regmap_reg_range(DA9063_REG_FAULT_LOG, DA9063_REG_VSYS_MON),
regmap_reg_range(DA9063_REG_COUNT_S, DA9063_BB_REG_ALARM_Y),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_CONFIG_I, DA9063_BB_REG_MON_REG_4),
regmap_reg_range(DA9063_BB_REG_GP_ID_0, DA9063_BB_REG_GP_ID_11),
};
static const struct regmap_access_table da9063_da_readable_table = {
.yes_ranges = da9063_da_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_da_readable_ranges),
};
static const struct regmap_access_table da9063_da_writeable_table = {
.yes_ranges = da9063_da_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063_da_writeable_ranges),
};
static const struct regmap_range da9063l_da_readable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_MON_A10_RES),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_T_OFFSET, DA9063_BB_REG_GP_ID_11),
regmap_reg_range(DA9063_REG_DEVICE_ID, DA9063_REG_VARIANT_ID),
};
static const struct regmap_range da9063l_da_writeable_ranges[] = {
regmap_reg_range(DA9063_REG_PAGE_CON, DA9063_REG_PAGE_CON),
regmap_reg_range(DA9063_REG_FAULT_LOG, DA9063_REG_VSYS_MON),
regmap_reg_range(DA9063_REG_SEQ, DA9063_REG_ID_32_31),
regmap_reg_range(DA9063_REG_SEQ_A, DA9063_REG_AUTO3_LOW),
regmap_reg_range(DA9063_REG_CONFIG_I, DA9063_BB_REG_MON_REG_4),
regmap_reg_range(DA9063_BB_REG_GP_ID_0, DA9063_BB_REG_GP_ID_11),
};
static const struct regmap_access_table da9063l_da_readable_table = {
.yes_ranges = da9063l_da_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063l_da_readable_ranges),
};
static const struct regmap_access_table da9063l_da_writeable_table = {
.yes_ranges = da9063l_da_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9063l_da_writeable_ranges),
};
static const struct regmap_range_cfg da9063_range_cfg[] = {
{
.range_min = DA9063_REG_PAGE_CON,
.range_max = DA9063_REG_CONFIG_ID,
.selector_reg = DA9063_REG_PAGE_CON,
.selector_mask = 1 << DA9063_I2C_PAGE_SEL_SHIFT,
.selector_shift = DA9063_I2C_PAGE_SEL_SHIFT,
.window_start = 0,
.window_len = 256,
}
};
static struct regmap_config da9063_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.ranges = da9063_range_cfg,
.num_ranges = ARRAY_SIZE(da9063_range_cfg),
.max_register = DA9063_REG_CONFIG_ID,
.cache_type = REGCACHE_RBTREE,
};
static const struct of_device_id da9063_dt_ids[] = {
{ .compatible = "dlg,da9063", },
{ .compatible = "dlg,da9063l", },
{ }
};
MODULE_DEVICE_TABLE(of, da9063_dt_ids);
static int da9063_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct da9063 *da9063;
int ret;
da9063 = devm_kzalloc(&i2c->dev, sizeof(struct da9063), GFP_KERNEL);
if (da9063 == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, da9063);
da9063->dev = &i2c->dev;
da9063->chip_irq = i2c->irq;
da9063->type = id->driver_data;
ret = da9063_get_device_type(i2c, da9063);
if (ret)
return ret;
switch (da9063->type) {
case PMIC_TYPE_DA9063:
switch (da9063->variant_code) {
case PMIC_DA9063_AD:
da9063_regmap_config.rd_table =
&da9063_ad_readable_table;
da9063_regmap_config.wr_table =
&da9063_ad_writeable_table;
da9063_regmap_config.volatile_table =
&da9063_ad_volatile_table;
break;
case PMIC_DA9063_BB:
case PMIC_DA9063_CA:
da9063_regmap_config.rd_table =
&da9063_bb_readable_table;
da9063_regmap_config.wr_table =
&da9063_bb_writeable_table;
da9063_regmap_config.volatile_table =
&da9063_bb_da_volatile_table;
break;
case PMIC_DA9063_DA:
da9063_regmap_config.rd_table =
&da9063_da_readable_table;
da9063_regmap_config.wr_table =
&da9063_da_writeable_table;
da9063_regmap_config.volatile_table =
&da9063_bb_da_volatile_table;
break;
default:
dev_err(da9063->dev,
"Chip variant not supported for DA9063\n");
return -ENODEV;
}
break;
case PMIC_TYPE_DA9063L:
switch (da9063->variant_code) {
case PMIC_DA9063_BB:
case PMIC_DA9063_CA:
da9063_regmap_config.rd_table =
&da9063l_bb_readable_table;
da9063_regmap_config.wr_table =
&da9063l_bb_writeable_table;
da9063_regmap_config.volatile_table =
&da9063l_bb_da_volatile_table;
break;
case PMIC_DA9063_DA:
da9063_regmap_config.rd_table =
&da9063l_da_readable_table;
da9063_regmap_config.wr_table =
&da9063l_da_writeable_table;
da9063_regmap_config.volatile_table =
&da9063l_bb_da_volatile_table;
break;
default:
dev_err(da9063->dev,
"Chip variant not supported for DA9063L\n");
return -ENODEV;
}
break;
default:
dev_err(da9063->dev, "Chip type not supported\n");
return -ENODEV;
}
da9063->regmap = devm_regmap_init_i2c(i2c, &da9063_regmap_config);
if (IS_ERR(da9063->regmap)) {
ret = PTR_ERR(da9063->regmap);
dev_err(da9063->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
/* If SMBus is not available and only I2C is possible, enter I2C mode */
if (i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C)) {
ret = regmap_clear_bits(da9063->regmap, DA9063_REG_CONFIG_J,
DA9063_TWOWIRE_TO);
if (ret < 0) {
dev_err(da9063->dev, "Failed to set Two-Wire Bus Mode.\n");
return -EIO;
}
}
return da9063_device_init(da9063, i2c->irq);
}
static const struct i2c_device_id da9063_i2c_id[] = {
{ "da9063", PMIC_TYPE_DA9063 },
{ "da9063l", PMIC_TYPE_DA9063L },
{},
};
MODULE_DEVICE_TABLE(i2c, da9063_i2c_id);
static struct i2c_driver da9063_i2c_driver = {
.driver = {
.name = "da9063",
.of_match_table = of_match_ptr(da9063_dt_ids),
},
.probe = da9063_i2c_probe,
.id_table = da9063_i2c_id,
};
module_i2c_driver(da9063_i2c_driver);
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