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linux-next/drivers/mfd/tps65910.c
Arnout Vandecappelle (Essensium/Mind) be1c770028 mfd: tps65910: Work around silicon erratum SWCZ010 
http://www.ti.com/lit/pdf/SWCZ010:
  Glitch on SDA-SCL not managed correctly by the I2C IP

Impact:
The standard specifies that the I2C transfer should restart on a start
event in all cases. The current design does not support two consecutive
Start conditions. This can cause the first real access after such a
glitch to be corrupted.

Description:
An unexpected glitch on SDA and SCL can generate a wrong start event.
In the current design, the SCL line must toggle two times to detect a
new start event and completely restart the I2C access; hence the real
start event is not detected in the case of a single SCL toggle.

Workaround:
Repeat I2C access.

A simpler workaround is to make a dummy transfer just before the first
access to the tps65910 chip. This can be done unconditionally.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2014-09-26 08:15:48 +01:00

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/*
* tps65910.c -- TI TPS6591x
*
* Copyright 2010 Texas Instruments Inc.
*
* Author: Graeme Gregory <gg@slimlogic.co.uk>
* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/mfd/core.h>
#include <linux/regmap.h>
#include <linux/mfd/tps65910.h>
#include <linux/of.h>
#include <linux/of_device.h>
static struct resource rtc_resources[] = {
{
.start = TPS65910_IRQ_RTC_ALARM,
.end = TPS65910_IRQ_RTC_ALARM,
.flags = IORESOURCE_IRQ,
}
};
static const struct mfd_cell tps65910s[] = {
{
.name = "tps65910-gpio",
},
{
.name = "tps65910-pmic",
},
{
.name = "tps65910-rtc",
.num_resources = ARRAY_SIZE(rtc_resources),
.resources = &rtc_resources[0],
},
{
.name = "tps65910-power",
},
};
static const struct regmap_irq tps65911_irqs[] = {
/* INT_STS */
[TPS65911_IRQ_PWRHOLD_F] = {
.mask = INT_MSK_PWRHOLD_F_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_VBAT_VMHI] = {
.mask = INT_MSK_VMBHI_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_PWRON] = {
.mask = INT_MSK_PWRON_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_PWRON_LP] = {
.mask = INT_MSK_PWRON_LP_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_PWRHOLD_R] = {
.mask = INT_MSK_PWRHOLD_R_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_HOTDIE] = {
.mask = INT_MSK_HOTDIE_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_RTC_ALARM] = {
.mask = INT_MSK_RTC_ALARM_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65911_IRQ_RTC_PERIOD] = {
.mask = INT_MSK_RTC_PERIOD_IT_MSK_MASK,
.reg_offset = 0,
},
/* INT_STS2 */
[TPS65911_IRQ_GPIO0_R] = {
.mask = INT_MSK2_GPIO0_R_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO0_F] = {
.mask = INT_MSK2_GPIO0_F_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO1_R] = {
.mask = INT_MSK2_GPIO1_R_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO1_F] = {
.mask = INT_MSK2_GPIO1_F_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO2_R] = {
.mask = INT_MSK2_GPIO2_R_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO2_F] = {
.mask = INT_MSK2_GPIO2_F_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO3_R] = {
.mask = INT_MSK2_GPIO3_R_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65911_IRQ_GPIO3_F] = {
.mask = INT_MSK2_GPIO3_F_IT_MSK_MASK,
.reg_offset = 1,
},
/* INT_STS2 */
[TPS65911_IRQ_GPIO4_R] = {
.mask = INT_MSK3_GPIO4_R_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_GPIO4_F] = {
.mask = INT_MSK3_GPIO4_F_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_GPIO5_R] = {
.mask = INT_MSK3_GPIO5_R_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_GPIO5_F] = {
.mask = INT_MSK3_GPIO5_F_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_WTCHDG] = {
.mask = INT_MSK3_WTCHDG_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_VMBCH2_H] = {
.mask = INT_MSK3_VMBCH2_H_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_VMBCH2_L] = {
.mask = INT_MSK3_VMBCH2_L_IT_MSK_MASK,
.reg_offset = 2,
},
[TPS65911_IRQ_PWRDN] = {
.mask = INT_MSK3_PWRDN_IT_MSK_MASK,
.reg_offset = 2,
},
};
static const struct regmap_irq tps65910_irqs[] = {
/* INT_STS */
[TPS65910_IRQ_VBAT_VMBDCH] = {
.mask = TPS65910_INT_MSK_VMBDCH_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_VBAT_VMHI] = {
.mask = TPS65910_INT_MSK_VMBHI_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_PWRON] = {
.mask = TPS65910_INT_MSK_PWRON_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_PWRON_LP] = {
.mask = TPS65910_INT_MSK_PWRON_LP_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_PWRHOLD] = {
.mask = TPS65910_INT_MSK_PWRHOLD_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_HOTDIE] = {
.mask = TPS65910_INT_MSK_HOTDIE_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_RTC_ALARM] = {
.mask = TPS65910_INT_MSK_RTC_ALARM_IT_MSK_MASK,
.reg_offset = 0,
},
[TPS65910_IRQ_RTC_PERIOD] = {
.mask = TPS65910_INT_MSK_RTC_PERIOD_IT_MSK_MASK,
.reg_offset = 0,
},
/* INT_STS2 */
[TPS65910_IRQ_GPIO_R] = {
.mask = TPS65910_INT_MSK2_GPIO0_F_IT_MSK_MASK,
.reg_offset = 1,
},
[TPS65910_IRQ_GPIO_F] = {
.mask = TPS65910_INT_MSK2_GPIO0_R_IT_MSK_MASK,
.reg_offset = 1,
},
};
static struct regmap_irq_chip tps65911_irq_chip = {
.name = "tps65910",
.irqs = tps65911_irqs,
.num_irqs = ARRAY_SIZE(tps65911_irqs),
.num_regs = 3,
.irq_reg_stride = 2,
.status_base = TPS65910_INT_STS,
.mask_base = TPS65910_INT_MSK,
.ack_base = TPS65910_INT_STS,
};
static struct regmap_irq_chip tps65910_irq_chip = {
.name = "tps65910",
.irqs = tps65910_irqs,
.num_irqs = ARRAY_SIZE(tps65910_irqs),
.num_regs = 2,
.irq_reg_stride = 2,
.status_base = TPS65910_INT_STS,
.mask_base = TPS65910_INT_MSK,
.ack_base = TPS65910_INT_STS,
};
static int tps65910_irq_init(struct tps65910 *tps65910, int irq,
struct tps65910_platform_data *pdata)
{
int ret = 0;
static struct regmap_irq_chip *tps6591x_irqs_chip;
if (!irq) {
dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
return -EINVAL;
}
if (!pdata) {
dev_warn(tps65910->dev, "No interrupt support, no pdata\n");
return -EINVAL;
}
switch (tps65910_chip_id(tps65910)) {
case TPS65910:
tps6591x_irqs_chip = &tps65910_irq_chip;
break;
case TPS65911:
tps6591x_irqs_chip = &tps65911_irq_chip;
break;
}
tps65910->chip_irq = irq;
ret = regmap_add_irq_chip(tps65910->regmap, tps65910->chip_irq,
IRQF_ONESHOT, pdata->irq_base,
tps6591x_irqs_chip, &tps65910->irq_data);
if (ret < 0) {
dev_warn(tps65910->dev, "Failed to add irq_chip %d\n", ret);
tps65910->chip_irq = 0;
}
return ret;
}
static int tps65910_irq_exit(struct tps65910 *tps65910)
{
if (tps65910->chip_irq > 0)
regmap_del_irq_chip(tps65910->chip_irq, tps65910->irq_data);
return 0;
}
static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
struct tps65910 *tps65910 = dev_get_drvdata(dev);
/*
* Caching all regulator registers.
* All regualator register address range is same for
* TPS65910 and TPS65911
*/
if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
/* Check for non-existing register */
if (tps65910_chip_id(tps65910) == TPS65910)
if ((reg == TPS65911_VDDCTRL_OP) ||
(reg == TPS65911_VDDCTRL_SR))
return true;
return false;
}
return true;
}
static const struct regmap_config tps65910_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = is_volatile_reg,
.max_register = TPS65910_MAX_REGISTER - 1,
.cache_type = REGCACHE_RBTREE,
};
static int tps65910_ck32k_init(struct tps65910 *tps65910,
struct tps65910_board *pmic_pdata)
{
int ret;
if (!pmic_pdata->en_ck32k_xtal)
return 0;
ret = tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
DEVCTRL_CK32K_CTRL_MASK);
if (ret < 0) {
dev_err(tps65910->dev, "clear ck32k_ctrl failed: %d\n", ret);
return ret;
}
return 0;
}
static int tps65910_sleepinit(struct tps65910 *tps65910,
struct tps65910_board *pmic_pdata)
{
struct device *dev = NULL;
int ret = 0;
dev = tps65910->dev;
if (!pmic_pdata->en_dev_slp)
return 0;
/* enabling SLEEP device state */
ret = tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
DEVCTRL_DEV_SLP_MASK);
if (ret < 0) {
dev_err(dev, "set dev_slp failed: %d\n", ret);
goto err_sleep_init;
}
/* Return if there is no sleep keepon data. */
if (!pmic_pdata->slp_keepon)
return 0;
if (pmic_pdata->slp_keepon->therm_keepon) {
ret = tps65910_reg_set_bits(tps65910,
TPS65910_SLEEP_KEEP_RES_ON,
SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
if (ret < 0) {
dev_err(dev, "set therm_keepon failed: %d\n", ret);
goto disable_dev_slp;
}
}
if (pmic_pdata->slp_keepon->clkout32k_keepon) {
ret = tps65910_reg_set_bits(tps65910,
TPS65910_SLEEP_KEEP_RES_ON,
SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
if (ret < 0) {
dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
goto disable_dev_slp;
}
}
if (pmic_pdata->slp_keepon->i2chs_keepon) {
ret = tps65910_reg_set_bits(tps65910,
TPS65910_SLEEP_KEEP_RES_ON,
SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
if (ret < 0) {
dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
goto disable_dev_slp;
}
}
return 0;
disable_dev_slp:
tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
DEVCTRL_DEV_SLP_MASK);
err_sleep_init:
return ret;
}
#ifdef CONFIG_OF
static const struct of_device_id tps65910_of_match[] = {
{ .compatible = "ti,tps65910", .data = (void *)TPS65910},
{ .compatible = "ti,tps65911", .data = (void *)TPS65911},
{ },
};
MODULE_DEVICE_TABLE(of, tps65910_of_match);
static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
unsigned long *chip_id)
{
struct device_node *np = client->dev.of_node;
struct tps65910_board *board_info;
unsigned int prop;
const struct of_device_id *match;
int ret = 0;
match = of_match_device(tps65910_of_match, &client->dev);
if (!match) {
dev_err(&client->dev, "Failed to find matching dt id\n");
return NULL;
}
*chip_id = (unsigned long)match->data;
board_info = devm_kzalloc(&client->dev, sizeof(*board_info),
GFP_KERNEL);
if (!board_info) {
dev_err(&client->dev, "Failed to allocate pdata\n");
return NULL;
}
ret = of_property_read_u32(np, "ti,vmbch-threshold", &prop);
if (!ret)
board_info->vmbch_threshold = prop;
ret = of_property_read_u32(np, "ti,vmbch2-threshold", &prop);
if (!ret)
board_info->vmbch2_threshold = prop;
prop = of_property_read_bool(np, "ti,en-ck32k-xtal");
board_info->en_ck32k_xtal = prop;
board_info->irq = client->irq;
board_info->irq_base = -1;
board_info->pm_off = of_property_read_bool(np,
"ti,system-power-controller");
return board_info;
}
#else
static inline
struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
unsigned long *chip_id)
{
return NULL;
}
#endif
static struct i2c_client *tps65910_i2c_client;
static void tps65910_power_off(void)
{
struct tps65910 *tps65910;
tps65910 = dev_get_drvdata(&tps65910_i2c_client->dev);
if (tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
DEVCTRL_PWR_OFF_MASK) < 0)
return;
tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
DEVCTRL_DEV_ON_MASK);
}
static int tps65910_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct tps65910 *tps65910;
struct tps65910_board *pmic_plat_data;
struct tps65910_board *of_pmic_plat_data = NULL;
struct tps65910_platform_data *init_data;
unsigned long chip_id = id->driver_data;
int ret = 0;
pmic_plat_data = dev_get_platdata(&i2c->dev);
if (!pmic_plat_data && i2c->dev.of_node) {
pmic_plat_data = tps65910_parse_dt(i2c, &chip_id);
of_pmic_plat_data = pmic_plat_data;
}
if (!pmic_plat_data)
return -EINVAL;
init_data = devm_kzalloc(&i2c->dev, sizeof(*init_data), GFP_KERNEL);
if (init_data == NULL)
return -ENOMEM;
tps65910 = devm_kzalloc(&i2c->dev, sizeof(*tps65910), GFP_KERNEL);
if (tps65910 == NULL)
return -ENOMEM;
tps65910->of_plat_data = of_pmic_plat_data;
i2c_set_clientdata(i2c, tps65910);
tps65910->dev = &i2c->dev;
tps65910->i2c_client = i2c;
tps65910->id = chip_id;
/* Work around silicon erratum SWCZ010: the tps65910 may miss the
* first I2C transfer. So issue a dummy transfer before the first
* real transfer.
*/
i2c_master_send(i2c, "", 1);
tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
if (IS_ERR(tps65910->regmap)) {
ret = PTR_ERR(tps65910->regmap);
dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
return ret;
}
init_data->irq = pmic_plat_data->irq;
init_data->irq_base = pmic_plat_data->irq_base;
tps65910_irq_init(tps65910, init_data->irq, init_data);
tps65910_ck32k_init(tps65910, pmic_plat_data);
tps65910_sleepinit(tps65910, pmic_plat_data);
if (pmic_plat_data->pm_off && !pm_power_off) {
tps65910_i2c_client = i2c;
pm_power_off = tps65910_power_off;
}
ret = mfd_add_devices(tps65910->dev, -1,
tps65910s, ARRAY_SIZE(tps65910s),
NULL, 0,
regmap_irq_get_domain(tps65910->irq_data));
if (ret < 0) {
dev_err(&i2c->dev, "mfd_add_devices failed: %d\n", ret);
tps65910_irq_exit(tps65910);
return ret;
}
return ret;
}
static int tps65910_i2c_remove(struct i2c_client *i2c)
{
struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
tps65910_irq_exit(tps65910);
mfd_remove_devices(tps65910->dev);
return 0;
}
static const struct i2c_device_id tps65910_i2c_id[] = {
{ "tps65910", TPS65910 },
{ "tps65911", TPS65911 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
static struct i2c_driver tps65910_i2c_driver = {
.driver = {
.name = "tps65910",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(tps65910_of_match),
},
.probe = tps65910_i2c_probe,
.remove = tps65910_i2c_remove,
.id_table = tps65910_i2c_id,
};
static int __init tps65910_i2c_init(void)
{
return i2c_add_driver(&tps65910_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps65910_i2c_init);
static void __exit tps65910_i2c_exit(void)
{
i2c_del_driver(&tps65910_i2c_driver);
}
module_exit(tps65910_i2c_exit);
MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
MODULE_LICENSE("GPL");
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