linux/drivers/gpio/gpio-tb10x.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

321 lines
8.5 KiB
C

/* Abilis Systems MODULE DESCRIPTION
*
* Copyright (C) Abilis Systems 2013
*
* Authors: Sascha Leuenberger <sascha.leuenberger@abilis.com>
* Christian Ruppert <christian.ruppert@abilis.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/pinctrl/consumer.h>
#define TB10X_GPIO_DIR_IN (0x00000000)
#define TB10X_GPIO_DIR_OUT (0x00000001)
#define OFFSET_TO_REG_DDR (0x00)
#define OFFSET_TO_REG_DATA (0x04)
#define OFFSET_TO_REG_INT_EN (0x08)
#define OFFSET_TO_REG_CHANGE (0x0C)
#define OFFSET_TO_REG_WRMASK (0x10)
#define OFFSET_TO_REG_INT_TYPE (0x14)
/**
* @spinlock: used for atomic read/modify/write of registers
* @base: register base address
* @domain: IRQ domain of GPIO generated interrupts managed by this controller
* @irq: Interrupt line of parent interrupt controller
* @gc: gpio_chip structure associated to this GPIO controller
*/
struct tb10x_gpio {
spinlock_t spinlock;
void __iomem *base;
struct irq_domain *domain;
int irq;
struct gpio_chip gc;
};
static inline u32 tb10x_reg_read(struct tb10x_gpio *gpio, unsigned int offs)
{
return ioread32(gpio->base + offs);
}
static inline void tb10x_reg_write(struct tb10x_gpio *gpio, unsigned int offs,
u32 val)
{
iowrite32(val, gpio->base + offs);
}
static inline void tb10x_set_bits(struct tb10x_gpio *gpio, unsigned int offs,
u32 mask, u32 val)
{
u32 r;
unsigned long flags;
spin_lock_irqsave(&gpio->spinlock, flags);
r = tb10x_reg_read(gpio, offs);
r = (r & ~mask) | (val & mask);
tb10x_reg_write(gpio, offs, r);
spin_unlock_irqrestore(&gpio->spinlock, flags);
}
static inline struct tb10x_gpio *to_tb10x_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct tb10x_gpio, gc);
}
static int tb10x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
int mask = BIT(offset);
int val = TB10X_GPIO_DIR_IN << offset;
tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val);
return 0;
}
static int tb10x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
int val;
val = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_DATA);
if (val & BIT(offset))
return 1;
else
return 0;
}
static void tb10x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
int mask = BIT(offset);
int val = value << offset;
tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DATA, mask, val);
}
static int tb10x_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
int mask = BIT(offset);
int val = TB10X_GPIO_DIR_OUT << offset;
tb10x_gpio_set(chip, offset, value);
tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val);
return 0;
}
static int tb10x_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_request_gpio(chip->base + offset);
}
static void tb10x_gpio_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_free_gpio(chip->base + offset);
}
static int tb10x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
return irq_create_mapping(tb10x_gpio->domain, offset);
}
static int tb10x_gpio_irq_set_type(struct irq_data *data, unsigned int type)
{
if ((type & IRQF_TRIGGER_MASK) != IRQ_TYPE_EDGE_BOTH) {
pr_err("Only (both) edge triggered interrupts supported.\n");
return -EINVAL;
}
irqd_set_trigger_type(data, type);
return IRQ_SET_MASK_OK;
}
static irqreturn_t tb10x_gpio_irq_cascade(int irq, void *data)
{
struct tb10x_gpio *tb10x_gpio = data;
u32 r = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_CHANGE);
u32 m = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_INT_EN);
const unsigned long bits = r & m;
int i;
for_each_set_bit(i, &bits, 32)
generic_handle_irq(irq_find_mapping(tb10x_gpio->domain, i));
return IRQ_HANDLED;
}
static int tb10x_gpio_probe(struct platform_device *pdev)
{
struct tb10x_gpio *tb10x_gpio;
struct resource *mem;
struct device_node *dn = pdev->dev.of_node;
int ret = -EBUSY;
u32 ngpio;
if (!dn)
return -EINVAL;
if (of_property_read_u32(dn, "abilis,ngpio", &ngpio))
return -EINVAL;
tb10x_gpio = devm_kzalloc(&pdev->dev, sizeof(*tb10x_gpio), GFP_KERNEL);
if (tb10x_gpio == NULL)
return -ENOMEM;
spin_lock_init(&tb10x_gpio->spinlock);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
tb10x_gpio->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(tb10x_gpio->base))
return PTR_ERR(tb10x_gpio->base);
tb10x_gpio->gc.label = of_node_full_name(dn);
tb10x_gpio->gc.dev = &pdev->dev;
tb10x_gpio->gc.owner = THIS_MODULE;
tb10x_gpio->gc.direction_input = tb10x_gpio_direction_in;
tb10x_gpio->gc.get = tb10x_gpio_get;
tb10x_gpio->gc.direction_output = tb10x_gpio_direction_out;
tb10x_gpio->gc.set = tb10x_gpio_set;
tb10x_gpio->gc.request = tb10x_gpio_request;
tb10x_gpio->gc.free = tb10x_gpio_free;
tb10x_gpio->gc.base = -1;
tb10x_gpio->gc.ngpio = ngpio;
tb10x_gpio->gc.can_sleep = false;
ret = gpiochip_add(&tb10x_gpio->gc);
if (ret < 0) {
dev_err(&pdev->dev, "Could not add gpiochip.\n");
goto fail_gpiochip_registration;
}
platform_set_drvdata(pdev, tb10x_gpio);
if (of_find_property(dn, "interrupt-controller", NULL)) {
struct irq_chip_generic *gc;
ret = platform_get_irq(pdev, 0);
if (ret < 0) {
dev_err(&pdev->dev, "No interrupt specified.\n");
goto fail_get_irq;
}
tb10x_gpio->gc.to_irq = tb10x_gpio_to_irq;
tb10x_gpio->irq = ret;
ret = devm_request_irq(&pdev->dev, ret, tb10x_gpio_irq_cascade,
IRQF_TRIGGER_NONE | IRQF_SHARED,
dev_name(&pdev->dev), tb10x_gpio);
if (ret != 0)
goto fail_request_irq;
tb10x_gpio->domain = irq_domain_add_linear(dn,
tb10x_gpio->gc.ngpio,
&irq_generic_chip_ops, NULL);
if (!tb10x_gpio->domain) {
ret = -ENOMEM;
goto fail_irq_domain;
}
ret = irq_alloc_domain_generic_chips(tb10x_gpio->domain,
tb10x_gpio->gc.ngpio, 1, tb10x_gpio->gc.label,
handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE,
IRQ_GC_INIT_MASK_CACHE);
if (ret)
goto fail_irq_domain;
gc = tb10x_gpio->domain->gc->gc[0];
gc->reg_base = tb10x_gpio->base;
gc->chip_types[0].type = IRQ_TYPE_EDGE_BOTH;
gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_set_type = tb10x_gpio_irq_set_type;
gc->chip_types[0].regs.ack = OFFSET_TO_REG_CHANGE;
gc->chip_types[0].regs.mask = OFFSET_TO_REG_INT_EN;
}
return 0;
fail_irq_domain:
fail_request_irq:
fail_get_irq:
gpiochip_remove(&tb10x_gpio->gc);
fail_gpiochip_registration:
fail_ioremap:
return ret;
}
static int __exit tb10x_gpio_remove(struct platform_device *pdev)
{
struct tb10x_gpio *tb10x_gpio = platform_get_drvdata(pdev);
if (tb10x_gpio->gc.to_irq) {
irq_remove_generic_chip(tb10x_gpio->domain->gc->gc[0],
BIT(tb10x_gpio->gc.ngpio) - 1, 0, 0);
kfree(tb10x_gpio->domain->gc);
irq_domain_remove(tb10x_gpio->domain);
free_irq(tb10x_gpio->irq, tb10x_gpio);
}
gpiochip_remove(&tb10x_gpio->gc);
return 0;
}
static const struct of_device_id tb10x_gpio_dt_ids[] = {
{ .compatible = "abilis,tb10x-gpio" },
{ }
};
MODULE_DEVICE_TABLE(of, tb10x_gpio_dt_ids);
static struct platform_driver tb10x_gpio_driver = {
.probe = tb10x_gpio_probe,
.remove = tb10x_gpio_remove,
.driver = {
.name = "tb10x-gpio",
.of_match_table = tb10x_gpio_dt_ids,
}
};
module_platform_driver(tb10x_gpio_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("tb10x gpio.");
MODULE_VERSION("0.0.1");