mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
97eda5dcc2
When STMFX supply is stopped, spurious interrupt can occur. To avoid that,
disable the interrupt in suspend before disabling the regulator and
re-enable it at the end of resume.
Fixes: 06252ade91
("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
564 lines
13 KiB
C
564 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Driver for STMicroelectronics Multi-Function eXpander (STMFX) core
|
|
*
|
|
* Copyright (C) 2019 STMicroelectronics
|
|
* Author(s): Amelie Delaunay <amelie.delaunay@st.com>.
|
|
*/
|
|
#include <linux/bitfield.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/mfd/stmfx.h>
|
|
#include <linux/module.h>
|
|
#include <linux/regulator/consumer.h>
|
|
|
|
static bool stmfx_reg_volatile(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case STMFX_REG_SYS_CTRL:
|
|
case STMFX_REG_IRQ_SRC_EN:
|
|
case STMFX_REG_IRQ_PENDING:
|
|
case STMFX_REG_IRQ_GPI_PENDING1:
|
|
case STMFX_REG_IRQ_GPI_PENDING2:
|
|
case STMFX_REG_IRQ_GPI_PENDING3:
|
|
case STMFX_REG_GPIO_STATE1:
|
|
case STMFX_REG_GPIO_STATE2:
|
|
case STMFX_REG_GPIO_STATE3:
|
|
case STMFX_REG_IRQ_GPI_SRC1:
|
|
case STMFX_REG_IRQ_GPI_SRC2:
|
|
case STMFX_REG_IRQ_GPI_SRC3:
|
|
case STMFX_REG_GPO_SET1:
|
|
case STMFX_REG_GPO_SET2:
|
|
case STMFX_REG_GPO_SET3:
|
|
case STMFX_REG_GPO_CLR1:
|
|
case STMFX_REG_GPO_CLR2:
|
|
case STMFX_REG_GPO_CLR3:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool stmfx_reg_writeable(struct device *dev, unsigned int reg)
|
|
{
|
|
return (reg >= STMFX_REG_SYS_CTRL);
|
|
}
|
|
|
|
static const struct regmap_config stmfx_regmap_config = {
|
|
.reg_bits = 8,
|
|
.reg_stride = 1,
|
|
.val_bits = 8,
|
|
.max_register = STMFX_REG_MAX,
|
|
.volatile_reg = stmfx_reg_volatile,
|
|
.writeable_reg = stmfx_reg_writeable,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static const struct resource stmfx_pinctrl_resources[] = {
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_GPIO),
|
|
};
|
|
|
|
static const struct resource stmfx_idd_resources[] = {
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_IDD),
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_ERROR),
|
|
};
|
|
|
|
static const struct resource stmfx_ts_resources[] = {
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_DET),
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_NE),
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_TH),
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_FULL),
|
|
DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_OVF),
|
|
};
|
|
|
|
static struct mfd_cell stmfx_cells[] = {
|
|
{
|
|
.of_compatible = "st,stmfx-0300-pinctrl",
|
|
.name = "stmfx-pinctrl",
|
|
.resources = stmfx_pinctrl_resources,
|
|
.num_resources = ARRAY_SIZE(stmfx_pinctrl_resources),
|
|
},
|
|
{
|
|
.of_compatible = "st,stmfx-0300-idd",
|
|
.name = "stmfx-idd",
|
|
.resources = stmfx_idd_resources,
|
|
.num_resources = ARRAY_SIZE(stmfx_idd_resources),
|
|
},
|
|
{
|
|
.of_compatible = "st,stmfx-0300-ts",
|
|
.name = "stmfx-ts",
|
|
.resources = stmfx_ts_resources,
|
|
.num_resources = ARRAY_SIZE(stmfx_ts_resources),
|
|
},
|
|
};
|
|
|
|
static u8 stmfx_func_to_mask(u32 func)
|
|
{
|
|
u8 mask = 0;
|
|
|
|
if (func & STMFX_FUNC_GPIO)
|
|
mask |= STMFX_REG_SYS_CTRL_GPIO_EN;
|
|
|
|
if ((func & STMFX_FUNC_ALTGPIO_LOW) || (func & STMFX_FUNC_ALTGPIO_HIGH))
|
|
mask |= STMFX_REG_SYS_CTRL_ALTGPIO_EN;
|
|
|
|
if (func & STMFX_FUNC_TS)
|
|
mask |= STMFX_REG_SYS_CTRL_TS_EN;
|
|
|
|
if (func & STMFX_FUNC_IDD)
|
|
mask |= STMFX_REG_SYS_CTRL_IDD_EN;
|
|
|
|
return mask;
|
|
}
|
|
|
|
int stmfx_function_enable(struct stmfx *stmfx, u32 func)
|
|
{
|
|
u32 sys_ctrl;
|
|
u8 mask;
|
|
int ret;
|
|
|
|
ret = regmap_read(stmfx->map, STMFX_REG_SYS_CTRL, &sys_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* IDD and TS have priority in STMFX FW, so if IDD and TS are enabled,
|
|
* ALTGPIO function is disabled by STMFX FW. If IDD or TS is enabled,
|
|
* the number of aGPIO available decreases. To avoid GPIO management
|
|
* disturbance, abort IDD or TS function enable in this case.
|
|
*/
|
|
if (((func & STMFX_FUNC_IDD) || (func & STMFX_FUNC_TS)) &&
|
|
(sys_ctrl & STMFX_REG_SYS_CTRL_ALTGPIO_EN)) {
|
|
dev_err(stmfx->dev, "ALTGPIO function already enabled\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* If TS is enabled, aGPIO[3:0] cannot be used */
|
|
if ((func & STMFX_FUNC_ALTGPIO_LOW) &&
|
|
(sys_ctrl & STMFX_REG_SYS_CTRL_TS_EN)) {
|
|
dev_err(stmfx->dev, "TS in use, aGPIO[3:0] unavailable\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* If IDD is enabled, aGPIO[7:4] cannot be used */
|
|
if ((func & STMFX_FUNC_ALTGPIO_HIGH) &&
|
|
(sys_ctrl & STMFX_REG_SYS_CTRL_IDD_EN)) {
|
|
dev_err(stmfx->dev, "IDD in use, aGPIO[7:4] unavailable\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
mask = stmfx_func_to_mask(func);
|
|
|
|
return regmap_update_bits(stmfx->map, STMFX_REG_SYS_CTRL, mask, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(stmfx_function_enable);
|
|
|
|
int stmfx_function_disable(struct stmfx *stmfx, u32 func)
|
|
{
|
|
u8 mask = stmfx_func_to_mask(func);
|
|
|
|
return regmap_update_bits(stmfx->map, STMFX_REG_SYS_CTRL, mask, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(stmfx_function_disable);
|
|
|
|
static void stmfx_irq_bus_lock(struct irq_data *data)
|
|
{
|
|
struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
|
|
|
|
mutex_lock(&stmfx->lock);
|
|
}
|
|
|
|
static void stmfx_irq_bus_sync_unlock(struct irq_data *data)
|
|
{
|
|
struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
|
|
|
|
regmap_write(stmfx->map, STMFX_REG_IRQ_SRC_EN, stmfx->irq_src);
|
|
|
|
mutex_unlock(&stmfx->lock);
|
|
}
|
|
|
|
static void stmfx_irq_mask(struct irq_data *data)
|
|
{
|
|
struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
|
|
|
|
stmfx->irq_src &= ~BIT(data->hwirq % 8);
|
|
}
|
|
|
|
static void stmfx_irq_unmask(struct irq_data *data)
|
|
{
|
|
struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
|
|
|
|
stmfx->irq_src |= BIT(data->hwirq % 8);
|
|
}
|
|
|
|
static struct irq_chip stmfx_irq_chip = {
|
|
.name = "stmfx-core",
|
|
.irq_bus_lock = stmfx_irq_bus_lock,
|
|
.irq_bus_sync_unlock = stmfx_irq_bus_sync_unlock,
|
|
.irq_mask = stmfx_irq_mask,
|
|
.irq_unmask = stmfx_irq_unmask,
|
|
};
|
|
|
|
static irqreturn_t stmfx_irq_handler(int irq, void *data)
|
|
{
|
|
struct stmfx *stmfx = data;
|
|
unsigned long bits;
|
|
u32 pending, ack;
|
|
int n, ret;
|
|
|
|
ret = regmap_read(stmfx->map, STMFX_REG_IRQ_PENDING, &pending);
|
|
if (ret)
|
|
return IRQ_NONE;
|
|
|
|
/*
|
|
* There is no ACK for GPIO, MFX_REG_IRQ_PENDING_GPIO is a logical OR
|
|
* of MFX_REG_IRQ_GPI _PENDING1/_PENDING2/_PENDING3
|
|
*/
|
|
ack = pending & ~BIT(STMFX_REG_IRQ_SRC_EN_GPIO);
|
|
if (ack) {
|
|
ret = regmap_write(stmfx->map, STMFX_REG_IRQ_ACK, ack);
|
|
if (ret)
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
bits = pending;
|
|
for_each_set_bit(n, &bits, STMFX_REG_IRQ_SRC_MAX)
|
|
handle_nested_irq(irq_find_mapping(stmfx->irq_domain, n));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int stmfx_irq_map(struct irq_domain *d, unsigned int virq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
irq_set_chip_data(virq, d->host_data);
|
|
irq_set_chip_and_handler(virq, &stmfx_irq_chip, handle_simple_irq);
|
|
irq_set_nested_thread(virq, 1);
|
|
irq_set_noprobe(virq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void stmfx_irq_unmap(struct irq_domain *d, unsigned int virq)
|
|
{
|
|
irq_set_chip_and_handler(virq, NULL, NULL);
|
|
irq_set_chip_data(virq, NULL);
|
|
}
|
|
|
|
static const struct irq_domain_ops stmfx_irq_ops = {
|
|
.map = stmfx_irq_map,
|
|
.unmap = stmfx_irq_unmap,
|
|
};
|
|
|
|
static void stmfx_irq_exit(struct i2c_client *client)
|
|
{
|
|
struct stmfx *stmfx = i2c_get_clientdata(client);
|
|
int hwirq;
|
|
|
|
for (hwirq = 0; hwirq < STMFX_REG_IRQ_SRC_MAX; hwirq++)
|
|
irq_dispose_mapping(irq_find_mapping(stmfx->irq_domain, hwirq));
|
|
|
|
irq_domain_remove(stmfx->irq_domain);
|
|
}
|
|
|
|
static int stmfx_irq_init(struct i2c_client *client)
|
|
{
|
|
struct stmfx *stmfx = i2c_get_clientdata(client);
|
|
u32 irqoutpin = 0, irqtrigger;
|
|
int ret;
|
|
|
|
stmfx->irq_domain = irq_domain_add_simple(stmfx->dev->of_node,
|
|
STMFX_REG_IRQ_SRC_MAX, 0,
|
|
&stmfx_irq_ops, stmfx);
|
|
if (!stmfx->irq_domain) {
|
|
dev_err(stmfx->dev, "Failed to create IRQ domain\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!of_property_read_bool(stmfx->dev->of_node, "drive-open-drain"))
|
|
irqoutpin |= STMFX_REG_IRQ_OUT_PIN_TYPE;
|
|
|
|
irqtrigger = irq_get_trigger_type(client->irq);
|
|
if ((irqtrigger & IRQ_TYPE_EDGE_RISING) ||
|
|
(irqtrigger & IRQ_TYPE_LEVEL_HIGH))
|
|
irqoutpin |= STMFX_REG_IRQ_OUT_PIN_POL;
|
|
|
|
ret = regmap_write(stmfx->map, STMFX_REG_IRQ_OUT_PIN, irqoutpin);
|
|
if (ret)
|
|
goto irq_exit;
|
|
|
|
ret = devm_request_threaded_irq(stmfx->dev, client->irq,
|
|
NULL, stmfx_irq_handler,
|
|
irqtrigger | IRQF_ONESHOT,
|
|
"stmfx", stmfx);
|
|
if (ret)
|
|
goto irq_exit;
|
|
|
|
stmfx->irq = client->irq;
|
|
|
|
return 0;
|
|
|
|
irq_exit:
|
|
stmfx_irq_exit(client);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stmfx_chip_reset(struct stmfx *stmfx)
|
|
{
|
|
int ret;
|
|
|
|
ret = regmap_write(stmfx->map, STMFX_REG_SYS_CTRL,
|
|
STMFX_REG_SYS_CTRL_SWRST);
|
|
if (ret)
|
|
return ret;
|
|
|
|
msleep(STMFX_BOOT_TIME_MS);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stmfx_chip_init(struct i2c_client *client)
|
|
{
|
|
struct stmfx *stmfx = i2c_get_clientdata(client);
|
|
u32 id;
|
|
u8 version[2];
|
|
int ret;
|
|
|
|
stmfx->vdd = devm_regulator_get_optional(&client->dev, "vdd");
|
|
ret = PTR_ERR_OR_ZERO(stmfx->vdd);
|
|
if (ret == -ENODEV) {
|
|
stmfx->vdd = NULL;
|
|
} else if (ret == -EPROBE_DEFER) {
|
|
return ret;
|
|
} else if (ret) {
|
|
dev_err(&client->dev, "Failed to get VDD regulator: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (stmfx->vdd) {
|
|
ret = regulator_enable(stmfx->vdd);
|
|
if (ret) {
|
|
dev_err(&client->dev, "VDD enable failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = regmap_read(stmfx->map, STMFX_REG_CHIP_ID, &id);
|
|
if (ret) {
|
|
dev_err(&client->dev, "Error reading chip ID: %d\n", ret);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Check that ID is the complement of the I2C address:
|
|
* STMFX I2C address follows the 7-bit format (MSB), that's why
|
|
* client->addr is shifted.
|
|
*
|
|
* STMFX_I2C_ADDR| STMFX | Linux
|
|
* input pin | I2C device address | I2C device address
|
|
*---------------------------------------------------------
|
|
* 0 | b: 1000 010x h:0x84 | 0x42
|
|
* 1 | b: 1000 011x h:0x86 | 0x43
|
|
*/
|
|
if (FIELD_GET(STMFX_REG_CHIP_ID_MASK, ~id) != (client->addr << 1)) {
|
|
dev_err(&client->dev, "Unknown chip ID: %#x\n", id);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
ret = regmap_bulk_read(stmfx->map, STMFX_REG_FW_VERSION_MSB,
|
|
version, ARRAY_SIZE(version));
|
|
if (ret) {
|
|
dev_err(&client->dev, "Error reading FW version: %d\n", ret);
|
|
goto err;
|
|
}
|
|
|
|
dev_info(&client->dev, "STMFX id: %#x, fw version: %x.%02x\n",
|
|
id, version[0], version[1]);
|
|
|
|
ret = stmfx_chip_reset(stmfx);
|
|
if (ret) {
|
|
dev_err(&client->dev, "Failed to reset chip: %d\n", ret);
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
if (stmfx->vdd)
|
|
return regulator_disable(stmfx->vdd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stmfx_chip_exit(struct i2c_client *client)
|
|
{
|
|
struct stmfx *stmfx = i2c_get_clientdata(client);
|
|
|
|
regmap_write(stmfx->map, STMFX_REG_IRQ_SRC_EN, 0);
|
|
regmap_write(stmfx->map, STMFX_REG_SYS_CTRL, 0);
|
|
|
|
if (stmfx->vdd)
|
|
return regulator_disable(stmfx->vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stmfx_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct stmfx *stmfx;
|
|
int ret;
|
|
|
|
stmfx = devm_kzalloc(dev, sizeof(*stmfx), GFP_KERNEL);
|
|
if (!stmfx)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, stmfx);
|
|
|
|
stmfx->dev = dev;
|
|
|
|
stmfx->map = devm_regmap_init_i2c(client, &stmfx_regmap_config);
|
|
if (IS_ERR(stmfx->map)) {
|
|
ret = PTR_ERR(stmfx->map);
|
|
dev_err(dev, "Failed to allocate register map: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
mutex_init(&stmfx->lock);
|
|
|
|
ret = stmfx_chip_init(client);
|
|
if (ret) {
|
|
if (ret == -ETIMEDOUT)
|
|
return -EPROBE_DEFER;
|
|
return ret;
|
|
}
|
|
|
|
if (client->irq < 0) {
|
|
dev_err(dev, "Failed to get IRQ: %d\n", client->irq);
|
|
ret = client->irq;
|
|
goto err_chip_exit;
|
|
}
|
|
|
|
ret = stmfx_irq_init(client);
|
|
if (ret)
|
|
goto err_chip_exit;
|
|
|
|
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
|
|
stmfx_cells, ARRAY_SIZE(stmfx_cells), NULL,
|
|
0, stmfx->irq_domain);
|
|
if (ret)
|
|
goto err_irq_exit;
|
|
|
|
return 0;
|
|
|
|
err_irq_exit:
|
|
stmfx_irq_exit(client);
|
|
err_chip_exit:
|
|
stmfx_chip_exit(client);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stmfx_remove(struct i2c_client *client)
|
|
{
|
|
stmfx_irq_exit(client);
|
|
|
|
return stmfx_chip_exit(client);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int stmfx_suspend(struct device *dev)
|
|
{
|
|
struct stmfx *stmfx = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = regmap_raw_read(stmfx->map, STMFX_REG_SYS_CTRL,
|
|
&stmfx->bkp_sysctrl, sizeof(stmfx->bkp_sysctrl));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_raw_read(stmfx->map, STMFX_REG_IRQ_OUT_PIN,
|
|
&stmfx->bkp_irqoutpin,
|
|
sizeof(stmfx->bkp_irqoutpin));
|
|
if (ret)
|
|
return ret;
|
|
|
|
disable_irq(stmfx->irq);
|
|
|
|
if (stmfx->vdd)
|
|
return regulator_disable(stmfx->vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stmfx_resume(struct device *dev)
|
|
{
|
|
struct stmfx *stmfx = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
if (stmfx->vdd) {
|
|
ret = regulator_enable(stmfx->vdd);
|
|
if (ret) {
|
|
dev_err(stmfx->dev,
|
|
"VDD enable failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Reset STMFX - supply has been stopped during suspend */
|
|
ret = stmfx_chip_reset(stmfx);
|
|
if (ret) {
|
|
dev_err(stmfx->dev, "Failed to reset chip: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_raw_write(stmfx->map, STMFX_REG_SYS_CTRL,
|
|
&stmfx->bkp_sysctrl, sizeof(stmfx->bkp_sysctrl));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_raw_write(stmfx->map, STMFX_REG_IRQ_OUT_PIN,
|
|
&stmfx->bkp_irqoutpin,
|
|
sizeof(stmfx->bkp_irqoutpin));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_raw_write(stmfx->map, STMFX_REG_IRQ_SRC_EN,
|
|
&stmfx->irq_src, sizeof(stmfx->irq_src));
|
|
if (ret)
|
|
return ret;
|
|
|
|
enable_irq(stmfx->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(stmfx_dev_pm_ops, stmfx_suspend, stmfx_resume);
|
|
|
|
static const struct of_device_id stmfx_of_match[] = {
|
|
{ .compatible = "st,stmfx-0300", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, stmfx_of_match);
|
|
|
|
static struct i2c_driver stmfx_driver = {
|
|
.driver = {
|
|
.name = "stmfx-core",
|
|
.of_match_table = of_match_ptr(stmfx_of_match),
|
|
.pm = &stmfx_dev_pm_ops,
|
|
},
|
|
.probe = stmfx_probe,
|
|
.remove = stmfx_remove,
|
|
};
|
|
module_i2c_driver(stmfx_driver);
|
|
|
|
MODULE_DESCRIPTION("STMFX core driver");
|
|
MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@st.com>");
|
|
MODULE_LICENSE("GPL v2");
|