linux/drivers/gpio/gpio-crystalcove.c
Aaron Lu e733a2fb8c gpio: crystalcove: use handle_nested_irq
The CrystalCove GPIO chip has can_sleep set so its demultiplexed irqs
will have IRQ_NESTED_THREAD flag set, thus we should use the nested
version handle_nested_irq in CrystalCove's irq handler instead of
handle_generic_irq, or the following warning will be hit and the
functionality is lost:

[ 4089.639554] Hardware name: ASUSTeK COMPUTER INC. T100TA/T100TA, BIOS T100TA.313 08/13/2014
[ 4089.639564]  00000002 00000000 c24fbdf4 c16e0257 c24fbe38 c24fbe28 c105390c c18ec480
[ 4089.639596]  c24fbe54 00000048 c18f8e3b 00000295 c10a60fc 00000295 c10a60fc f4464540
[ 4089.639626]  f446459c c278ad40 c24fbe40 c1053974 00000009 c24fbe38 c18ec480 c24fbe54
[ 4089.639656] Call Trace:
[ 4089.639685]  [<c16e0257>] dump_stack+0x41/0x52
[ 4089.639707]  [<c105390c>] warn_slowpath_common+0x8c/0xc0
[ 4089.639727]  [<c10a60fc>] ? irq_nested_primary_handler+0x2c/0x30
[ 4089.639744]  [<c10a60fc>] ? irq_nested_primary_handler+0x2c/0x30
[ 4089.639763]  [<c1053974>] warn_slowpath_fmt+0x34/0x40
[ 4089.639781]  [<c10a60fc>] irq_nested_primary_handler+0x2c/0x30
[ 4089.639800]  [<c10a5c56>] handle_irq_event_percpu+0x76/0x190
[ 4089.639818]  [<c1461570>] ? regmap_format_10_14_write+0x30/0x30
[ 4089.639836]  [<c1464f4c>] ? _regmap_bus_raw_write+0x4c/0x70
[ 4089.639854]  [<c10a5da1>] handle_irq_event+0x31/0x50
[ 4089.639872]  [<c10a83eb>] handle_simple_irq+0x4b/0x70
[ 4089.639889]  [<c10a5384>] generic_handle_irq+0x24/0x40
[ 4089.639908]  [<c1366d87>] crystalcove_gpio_irq_handler+0xa7/0xc0
[ 4089.639927]  [<c10a85a7>] handle_nested_irq+0x77/0x190
[ 4089.639947]  [<c1469801>] regmap_irq_thread+0x1b1/0x360
[ 4089.639966]  [<c10a6ae8>] irq_thread_fn+0x18/0x30
[ 4089.639983]  [<c10a6906>] irq_thread+0xf6/0x110
[ 4089.640001]  [<c10a6ad0>] ? irq_finalize_oneshot.part.30+0x1b0/0x1b0
[ 4089.640019]  [<c10a6b50>] ? irq_forced_thread_fn+0x50/0x50
[ 4089.640037]  [<c10a6810>] ? irq_thread_check_affinity+0xc0/0xc0
[ 4089.640054]  [<c106f389>] kthread+0xa9/0xc0
[ 4089.640074]  [<c16e6401>] ret_from_kernel_thread+0x21/0x30
[ 4089.640091]  [<c106f2e0>] ? kthread_create_on_node+0x110/0x110
[ 4089.640105] ---[ end trace dca7946ad31eba7d ]---

Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=90521
Reported-and-tested-by: Brian Loften <bloften80@gmail.com>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-01-14 14:12:02 +01:00

390 lines
9.5 KiB
C

/*
* gpio-crystalcove.c - Intel Crystal Cove GPIO Driver
*
* Copyright (C) 2012, 2014 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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.
*
* Author: Yang, Bin <bin.yang@intel.com>
*/
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/seq_file.h>
#include <linux/bitops.h>
#include <linux/regmap.h>
#include <linux/mfd/intel_soc_pmic.h>
#define CRYSTALCOVE_GPIO_NUM 16
#define CRYSTALCOVE_VGPIO_NUM 94
#define UPDATE_IRQ_TYPE BIT(0)
#define UPDATE_IRQ_MASK BIT(1)
#define GPIO0IRQ 0x0b
#define GPIO1IRQ 0x0c
#define MGPIO0IRQS0 0x19
#define MGPIO1IRQS0 0x1a
#define MGPIO0IRQSX 0x1b
#define MGPIO1IRQSX 0x1c
#define GPIO0P0CTLO 0x2b
#define GPIO0P0CTLI 0x33
#define GPIO1P0CTLO 0x3b
#define GPIO1P0CTLI 0x43
#define CTLI_INTCNT_DIS (0)
#define CTLI_INTCNT_NE (1 << 1)
#define CTLI_INTCNT_PE (2 << 1)
#define CTLI_INTCNT_BE (3 << 1)
#define CTLO_DIR_IN (0)
#define CTLO_DIR_OUT (1 << 5)
#define CTLO_DRV_CMOS (0)
#define CTLO_DRV_OD (1 << 4)
#define CTLO_DRV_REN (1 << 3)
#define CTLO_RVAL_2KDW (0)
#define CTLO_RVAL_2KUP (1 << 1)
#define CTLO_RVAL_50KDW (2 << 1)
#define CTLO_RVAL_50KUP (3 << 1)
#define CTLO_INPUT_SET (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP)
#define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET)
enum ctrl_register {
CTRL_IN,
CTRL_OUT,
};
/**
* struct crystalcove_gpio - Crystal Cove GPIO controller
* @buslock: for bus lock/sync and unlock.
* @chip: the abstract gpio_chip structure.
* @regmap: the regmap from the parent device.
* @update: pending IRQ setting update, to be written to the chip upon unlock.
* @intcnt_value: the Interrupt Detect value to be written.
* @set_irq_mask: true if the IRQ mask needs to be set, false to clear.
*/
struct crystalcove_gpio {
struct mutex buslock; /* irq_bus_lock */
struct gpio_chip chip;
struct regmap *regmap;
int update;
int intcnt_value;
bool set_irq_mask;
};
static inline struct crystalcove_gpio *to_cg(struct gpio_chip *gc)
{
return container_of(gc, struct crystalcove_gpio, chip);
}
static inline int to_reg(int gpio, enum ctrl_register reg_type)
{
int reg;
if (reg_type == CTRL_IN) {
if (gpio < 8)
reg = GPIO0P0CTLI;
else
reg = GPIO1P0CTLI;
} else {
if (gpio < 8)
reg = GPIO0P0CTLO;
else
reg = GPIO1P0CTLO;
}
return reg + gpio % 8;
}
static void crystalcove_update_irq_mask(struct crystalcove_gpio *cg,
int gpio)
{
u8 mirqs0 = gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0;
int mask = BIT(gpio % 8);
if (cg->set_irq_mask)
regmap_update_bits(cg->regmap, mirqs0, mask, mask);
else
regmap_update_bits(cg->regmap, mirqs0, mask, 0);
}
static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio)
{
int reg = to_reg(gpio, CTRL_IN);
regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value);
}
static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
{
struct crystalcove_gpio *cg = to_cg(chip);
if (gpio > CRYSTALCOVE_VGPIO_NUM)
return 0;
return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT),
CTLO_INPUT_SET);
}
static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio,
int value)
{
struct crystalcove_gpio *cg = to_cg(chip);
if (gpio > CRYSTALCOVE_VGPIO_NUM)
return 0;
return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT),
CTLO_OUTPUT_SET | value);
}
static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
struct crystalcove_gpio *cg = to_cg(chip);
int ret;
unsigned int val;
if (gpio > CRYSTALCOVE_VGPIO_NUM)
return 0;
ret = regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &val);
if (ret)
return ret;
return val & 0x1;
}
static void crystalcove_gpio_set(struct gpio_chip *chip,
unsigned gpio, int value)
{
struct crystalcove_gpio *cg = to_cg(chip);
if (gpio > CRYSTALCOVE_VGPIO_NUM)
return;
if (value)
regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 1);
else
regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 0);
}
static int crystalcove_irq_type(struct irq_data *data, unsigned type)
{
struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
switch (type) {
case IRQ_TYPE_NONE:
cg->intcnt_value = CTLI_INTCNT_DIS;
break;
case IRQ_TYPE_EDGE_BOTH:
cg->intcnt_value = CTLI_INTCNT_BE;
break;
case IRQ_TYPE_EDGE_RISING:
cg->intcnt_value = CTLI_INTCNT_PE;
break;
case IRQ_TYPE_EDGE_FALLING:
cg->intcnt_value = CTLI_INTCNT_NE;
break;
default:
return -EINVAL;
}
cg->update |= UPDATE_IRQ_TYPE;
return 0;
}
static void crystalcove_bus_lock(struct irq_data *data)
{
struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
mutex_lock(&cg->buslock);
}
static void crystalcove_bus_sync_unlock(struct irq_data *data)
{
struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
int gpio = data->hwirq;
if (cg->update & UPDATE_IRQ_TYPE)
crystalcove_update_irq_ctrl(cg, gpio);
if (cg->update & UPDATE_IRQ_MASK)
crystalcove_update_irq_mask(cg, gpio);
cg->update = 0;
mutex_unlock(&cg->buslock);
}
static void crystalcove_irq_unmask(struct irq_data *data)
{
struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
cg->set_irq_mask = false;
cg->update |= UPDATE_IRQ_MASK;
}
static void crystalcove_irq_mask(struct irq_data *data)
{
struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
cg->set_irq_mask = true;
cg->update |= UPDATE_IRQ_MASK;
}
static struct irq_chip crystalcove_irqchip = {
.name = "Crystal Cove",
.irq_mask = crystalcove_irq_mask,
.irq_unmask = crystalcove_irq_unmask,
.irq_set_type = crystalcove_irq_type,
.irq_bus_lock = crystalcove_bus_lock,
.irq_bus_sync_unlock = crystalcove_bus_sync_unlock,
};
static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data)
{
struct crystalcove_gpio *cg = data;
unsigned int p0, p1;
int pending;
int gpio;
unsigned int virq;
if (regmap_read(cg->regmap, GPIO0IRQ, &p0) ||
regmap_read(cg->regmap, GPIO1IRQ, &p1))
return IRQ_NONE;
regmap_write(cg->regmap, GPIO0IRQ, p0);
regmap_write(cg->regmap, GPIO1IRQ, p1);
pending = p0 | p1 << 8;
for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
if (pending & BIT(gpio)) {
virq = irq_find_mapping(cg->chip.irqdomain, gpio);
handle_nested_irq(virq);
}
}
return IRQ_HANDLED;
}
static void crystalcove_gpio_dbg_show(struct seq_file *s,
struct gpio_chip *chip)
{
struct crystalcove_gpio *cg = to_cg(chip);
int gpio, offset;
unsigned int ctlo, ctli, mirqs0, mirqsx, irq;
for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
regmap_read(cg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &ctli);
regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0,
&mirqs0);
regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQSX : MGPIO1IRQSX,
&mirqsx);
regmap_read(cg->regmap, gpio < 8 ? GPIO0IRQ : GPIO1IRQ,
&irq);
offset = gpio % 8;
seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s %s\n",
gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
ctli & 0x1 ? "hi" : "lo",
ctli & CTLI_INTCNT_NE ? "fall" : " ",
ctli & CTLI_INTCNT_PE ? "rise" : " ",
ctlo,
mirqs0 & BIT(offset) ? "s0 mask " : "s0 unmask",
mirqsx & BIT(offset) ? "sx mask " : "sx unmask",
irq & BIT(offset) ? "pending" : " ");
}
}
static int crystalcove_gpio_probe(struct platform_device *pdev)
{
int irq = platform_get_irq(pdev, 0);
struct crystalcove_gpio *cg;
int retval;
struct device *dev = pdev->dev.parent;
struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
if (irq < 0)
return irq;
cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL);
if (!cg)
return -ENOMEM;
platform_set_drvdata(pdev, cg);
mutex_init(&cg->buslock);
cg->chip.label = KBUILD_MODNAME;
cg->chip.direction_input = crystalcove_gpio_dir_in;
cg->chip.direction_output = crystalcove_gpio_dir_out;
cg->chip.get = crystalcove_gpio_get;
cg->chip.set = crystalcove_gpio_set;
cg->chip.base = -1;
cg->chip.ngpio = CRYSTALCOVE_VGPIO_NUM;
cg->chip.can_sleep = true;
cg->chip.dev = dev;
cg->chip.dbg_show = crystalcove_gpio_dbg_show;
cg->regmap = pmic->regmap;
retval = gpiochip_add(&cg->chip);
if (retval) {
dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
return retval;
}
gpiochip_irqchip_add(&cg->chip, &crystalcove_irqchip, 0,
handle_simple_irq, IRQ_TYPE_NONE);
retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler,
IRQF_ONESHOT, KBUILD_MODNAME, cg);
if (retval) {
dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
goto out_remove_gpio;
}
return 0;
out_remove_gpio:
gpiochip_remove(&cg->chip);
return retval;
}
static int crystalcove_gpio_remove(struct platform_device *pdev)
{
struct crystalcove_gpio *cg = platform_get_drvdata(pdev);
int irq = platform_get_irq(pdev, 0);
gpiochip_remove(&cg->chip);
if (irq >= 0)
free_irq(irq, cg);
return 0;
}
static struct platform_driver crystalcove_gpio_driver = {
.probe = crystalcove_gpio_probe,
.remove = crystalcove_gpio_remove,
.driver = {
.name = "crystal_cove_gpio",
},
};
module_platform_driver(crystalcove_gpio_driver);
MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
MODULE_DESCRIPTION("Intel Crystal Cove GPIO Driver");
MODULE_LICENSE("GPL v2");