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remarkable-linux/drivers/mfd/tps65090.c
Mark Brown 55692af5eb mfd: core: Push irqdomain mapping out into devices 
Currently the MFD core supports remapping MFD cell interrupts using an
irqdomain but only if the MFD is being instantiated using device tree
and only if the device tree bindings use the pattern of registering IPs
in the device tree with compatible properties.  This will be actively
harmful for drivers which support non-DT platforms and use this pattern
for their DT bindings as it will mean that the core will silently change
remapping behaviour and it is also limiting for drivers which don't do
DT with this particular pattern.  There is also a potential fragility if
there are interrupts not associated with MFD cells and all the cells are
omitted from the device tree for some reason.

Instead change the code to take an IRQ domain as an optional argument,
allowing drivers to take the decision about the parent domain for their
interrupts.  The one current user of this feature is ab8500-core, it has
the domain lookup pushed out into the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-14 09:51:54 +02:00

376 lines
9.1 KiB
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/*
* Core driver for TI TPS65090 PMIC family
*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
* This program is distributed in the hope 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.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65090.h>
#include <linux/regmap.h>
#include <linux/err.h>
#define NUM_INT_REG 2
#define TOTAL_NUM_REG 0x18
/* interrupt status registers */
#define TPS65090_INT_STS 0x0
#define TPS65090_INT_STS2 0x1
/* interrupt mask registers */
#define TPS65090_INT_MSK 0x2
#define TPS65090_INT_MSK2 0x3
struct tps65090_irq_data {
u8 mask_reg;
u8 mask_pos;
};
#define TPS65090_IRQ(_reg, _mask_pos) \
{ \
.mask_reg = (_reg), \
.mask_pos = (_mask_pos), \
}
static const struct tps65090_irq_data tps65090_irqs[] = {
[0] = TPS65090_IRQ(0, 0),
[1] = TPS65090_IRQ(0, 1),
[2] = TPS65090_IRQ(0, 2),
[3] = TPS65090_IRQ(0, 3),
[4] = TPS65090_IRQ(0, 4),
[5] = TPS65090_IRQ(0, 5),
[6] = TPS65090_IRQ(0, 6),
[7] = TPS65090_IRQ(0, 7),
[8] = TPS65090_IRQ(1, 0),
[9] = TPS65090_IRQ(1, 1),
[10] = TPS65090_IRQ(1, 2),
[11] = TPS65090_IRQ(1, 3),
[12] = TPS65090_IRQ(1, 4),
[13] = TPS65090_IRQ(1, 5),
[14] = TPS65090_IRQ(1, 6),
[15] = TPS65090_IRQ(1, 7),
};
static struct mfd_cell tps65090s[] = {
{
.name = "tps65090-pmic",
},
{
.name = "tps65090-regulator",
},
};
int tps65090_write(struct device *dev, int reg, uint8_t val)
{
struct tps65090 *tps = dev_get_drvdata(dev);
return regmap_write(tps->rmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65090_write);
int tps65090_read(struct device *dev, int reg, uint8_t *val)
{
struct tps65090 *tps = dev_get_drvdata(dev);
unsigned int temp_val;
int ret;
ret = regmap_read(tps->rmap, reg, &temp_val);
if (!ret)
*val = temp_val;
return ret;
}
EXPORT_SYMBOL_GPL(tps65090_read);
int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num)
{
struct tps65090 *tps = dev_get_drvdata(dev);
return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u);
}
EXPORT_SYMBOL_GPL(tps65090_set_bits);
int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num)
{
struct tps65090 *tps = dev_get_drvdata(dev);
return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u);
}
EXPORT_SYMBOL_GPL(tps65090_clr_bits);
static void tps65090_irq_lock(struct irq_data *data)
{
struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
mutex_lock(&tps65090->irq_lock);
}
static void tps65090_irq_mask(struct irq_data *irq_data)
{
struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->hwirq;
const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
data->mask_pos);
}
static void tps65090_irq_unmask(struct irq_data *irq_data)
{
struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->irq - tps65090->irq_base;
const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
data->mask_pos);
}
static void tps65090_irq_sync_unlock(struct irq_data *data)
{
struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
mutex_unlock(&tps65090->irq_lock);
}
static irqreturn_t tps65090_irq(int irq, void *data)
{
struct tps65090 *tps65090 = data;
int ret = 0;
u8 status, mask;
unsigned long int acks = 0;
int i;
for (i = 0; i < NUM_INT_REG; i++) {
ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask);
if (ret < 0) {
dev_err(tps65090->dev,
"failed to read mask reg [addr:%d]\n",
TPS65090_INT_MSK + i);
return IRQ_NONE;
}
ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i,
&status);
if (ret < 0) {
dev_err(tps65090->dev,
"failed to read status reg [addr:%d]\n",
TPS65090_INT_STS + i);
return IRQ_NONE;
}
if (status) {
/* Ack only those interrupts which are not masked */
status &= (~mask);
ret = tps65090_write(tps65090->dev,
TPS65090_INT_STS + i, status);
if (ret < 0) {
dev_err(tps65090->dev,
"failed to write interrupt status\n");
return IRQ_NONE;
}
acks |= (status << (i * 8));
}
}
for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs))
handle_nested_irq(tps65090->irq_base + i);
return acks ? IRQ_HANDLED : IRQ_NONE;
}
static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq,
int irq_base)
{
int i, ret;
if (!irq_base) {
dev_err(tps65090->dev, "IRQ base not set\n");
return -EINVAL;
}
mutex_init(&tps65090->irq_lock);
for (i = 0; i < NUM_INT_REG; i++)
tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF);
for (i = 0; i < NUM_INT_REG; i++)
tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff);
tps65090->irq_base = irq_base;
tps65090->irq_chip.name = "tps65090";
tps65090->irq_chip.irq_mask = tps65090_irq_mask;
tps65090->irq_chip.irq_unmask = tps65090_irq_unmask;
tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock;
tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock;
for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
int __irq = i + tps65090->irq_base;
irq_set_chip_data(__irq, tps65090);
irq_set_chip_and_handler(__irq, &tps65090->irq_chip,
handle_simple_irq);
irq_set_nested_thread(__irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(__irq, IRQF_VALID);
#endif
}
ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT,
"tps65090", tps65090);
if (!ret) {
device_init_wakeup(tps65090->dev, 1);
enable_irq_wake(irq);
}
return ret;
}
static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS))
return true;
else
return false;
}
static const struct regmap_config tps65090_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TOTAL_NUM_REG,
.num_reg_defaults_raw = TOTAL_NUM_REG,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = is_volatile_reg,
};
static int __devinit tps65090_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps65090_platform_data *pdata = client->dev.platform_data;
struct tps65090 *tps65090;
int ret;
if (!pdata) {
dev_err(&client->dev, "tps65090 requires platform data\n");
return -EINVAL;
}
tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090),
GFP_KERNEL);
if (tps65090 == NULL)
return -ENOMEM;
tps65090->client = client;
tps65090->dev = &client->dev;
i2c_set_clientdata(client, tps65090);
mutex_init(&tps65090->lock);
if (client->irq) {
ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base);
if (ret) {
dev_err(&client->dev, "IRQ init failed with err: %d\n",
ret);
goto err_exit;
}
}
tps65090->rmap = devm_regmap_init_i2c(tps65090->client,
&tps65090_regmap_config);
if (IS_ERR(tps65090->rmap)) {
ret = PTR_ERR(tps65090->rmap);
dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
goto err_irq_exit;
}
ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
ARRAY_SIZE(tps65090s), NULL, 0, NULL);
if (ret) {
dev_err(&client->dev, "add mfd devices failed with err: %d\n",
ret);
goto err_irq_exit;
}
return 0;
err_irq_exit:
if (client->irq)
free_irq(client->irq, tps65090);
err_exit:
return ret;
}
static int __devexit tps65090_i2c_remove(struct i2c_client *client)
{
struct tps65090 *tps65090 = i2c_get_clientdata(client);
mfd_remove_devices(tps65090->dev);
if (client->irq)
free_irq(client->irq, tps65090);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tps65090_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
if (client->irq)
disable_irq(client->irq);
return 0;
}
static int tps65090_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
if (client->irq)
enable_irq(client->irq);
return 0;
}
#endif
static const struct dev_pm_ops tps65090_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume)
};
static const struct i2c_device_id tps65090_id_table[] = {
{ "tps65090", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
static struct i2c_driver tps65090_driver = {
.driver = {
.name = "tps65090",
.owner = THIS_MODULE,
.pm = &tps65090_pm_ops,
},
.probe = tps65090_i2c_probe,
.remove = __devexit_p(tps65090_i2c_remove),
.id_table = tps65090_id_table,
};
static int __init tps65090_init(void)
{
return i2c_add_driver(&tps65090_driver);
}
subsys_initcall(tps65090_init);
static void __exit tps65090_exit(void)
{
i2c_del_driver(&tps65090_driver);
}
module_exit(tps65090_exit);
MODULE_DESCRIPTION("TPS65090 core driver");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
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