Contributors: 17
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Anton Vorontsov |
1224 |
82.98% |
5 |
20.00% |
| Joakim Tjernlund |
93 |
6.31% |
1 |
4.00% |
| Linus Walleij |
52 |
3.53% |
3 |
12.00% |
| Dmitry Torokhov |
35 |
2.37% |
1 |
4.00% |
| Christophe Leroy |
16 |
1.08% |
2 |
8.00% |
| Rasmus Villemoes |
14 |
0.95% |
1 |
4.00% |
| Grant C. Likely |
9 |
0.61% |
2 |
8.00% |
| Michael Barkowski |
9 |
0.61% |
1 |
4.00% |
| Dan Carpenter |
7 |
0.47% |
1 |
4.00% |
| Andy Shevchenko |
5 |
0.34% |
1 |
4.00% |
| Paul Gortmaker |
3 |
0.20% |
1 |
4.00% |
| Linus Torvalds (pre-git) |
2 |
0.14% |
1 |
4.00% |
| Thomas Gleixner |
2 |
0.14% |
1 |
4.00% |
| Linus Torvalds |
1 |
0.07% |
1 |
4.00% |
| Zhao Qiang |
1 |
0.07% |
1 |
4.00% |
| Rob Herring |
1 |
0.07% |
1 |
4.00% |
| Arnd Bergmann |
1 |
0.07% |
1 |
4.00% |
| Total |
1475 |
|
25 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* QUICC Engine GPIOs
*
* Copyright (c) MontaVista Software, Inc. 2008.
*
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/gpio/legacy-of-mm-gpiochip.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/property.h>
#include <soc/fsl/qe/qe.h>
struct qe_gpio_chip {
struct of_mm_gpio_chip mm_gc;
spinlock_t lock;
/* shadowed data register to clear/set bits safely */
u32 cpdata;
/* saved_regs used to restore dedicated functions */
struct qe_pio_regs saved_regs;
};
static void qe_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
{
struct qe_gpio_chip *qe_gc =
container_of(mm_gc, struct qe_gpio_chip, mm_gc);
struct qe_pio_regs __iomem *regs = mm_gc->regs;
qe_gc->cpdata = ioread32be(®s->cpdata);
qe_gc->saved_regs.cpdata = qe_gc->cpdata;
qe_gc->saved_regs.cpdir1 = ioread32be(®s->cpdir1);
qe_gc->saved_regs.cpdir2 = ioread32be(®s->cpdir2);
qe_gc->saved_regs.cppar1 = ioread32be(®s->cppar1);
qe_gc->saved_regs.cppar2 = ioread32be(®s->cppar2);
qe_gc->saved_regs.cpodr = ioread32be(®s->cpodr);
}
static int qe_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct qe_pio_regs __iomem *regs = mm_gc->regs;
u32 pin_mask = 1 << (QE_PIO_PINS - 1 - gpio);
return !!(ioread32be(®s->cpdata) & pin_mask);
}
static void qe_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct qe_gpio_chip *qe_gc = gpiochip_get_data(gc);
struct qe_pio_regs __iomem *regs = mm_gc->regs;
unsigned long flags;
u32 pin_mask = 1 << (QE_PIO_PINS - 1 - gpio);
spin_lock_irqsave(&qe_gc->lock, flags);
if (val)
qe_gc->cpdata |= pin_mask;
else
qe_gc->cpdata &= ~pin_mask;
iowrite32be(qe_gc->cpdata, ®s->cpdata);
spin_unlock_irqrestore(&qe_gc->lock, flags);
}
static void qe_gpio_set_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct qe_gpio_chip *qe_gc = gpiochip_get_data(gc);
struct qe_pio_regs __iomem *regs = mm_gc->regs;
unsigned long flags;
int i;
spin_lock_irqsave(&qe_gc->lock, flags);
for (i = 0; i < gc->ngpio; i++) {
if (*mask == 0)
break;
if (__test_and_clear_bit(i, mask)) {
if (test_bit(i, bits))
qe_gc->cpdata |= (1U << (QE_PIO_PINS - 1 - i));
else
qe_gc->cpdata &= ~(1U << (QE_PIO_PINS - 1 - i));
}
}
iowrite32be(qe_gc->cpdata, ®s->cpdata);
spin_unlock_irqrestore(&qe_gc->lock, flags);
}
static int qe_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct qe_gpio_chip *qe_gc = gpiochip_get_data(gc);
unsigned long flags;
spin_lock_irqsave(&qe_gc->lock, flags);
__par_io_config_pin(mm_gc->regs, gpio, QE_PIO_DIR_IN, 0, 0, 0);
spin_unlock_irqrestore(&qe_gc->lock, flags);
return 0;
}
static int qe_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct qe_gpio_chip *qe_gc = gpiochip_get_data(gc);
unsigned long flags;
qe_gpio_set(gc, gpio, val);
spin_lock_irqsave(&qe_gc->lock, flags);
__par_io_config_pin(mm_gc->regs, gpio, QE_PIO_DIR_OUT, 0, 0, 0);
spin_unlock_irqrestore(&qe_gc->lock, flags);
return 0;
}
struct qe_pin {
/*
* The qe_gpio_chip name is unfortunate, we should change that to
* something like qe_pio_controller. Someday.
*/
struct qe_gpio_chip *controller;
int num;
};
/**
* qe_pin_request - Request a QE pin
* @dev: device to get the pin from
* @index: index of the pin in the device tree
* Context: non-atomic
*
* This function return qe_pin so that you could use it with the rest of
* the QE Pin Multiplexing API.
*/
struct qe_pin *qe_pin_request(struct device *dev, int index)
{
struct qe_pin *qe_pin;
struct gpio_chip *gc;
struct gpio_desc *gpiod;
int gpio_num;
int err;
qe_pin = kzalloc(sizeof(*qe_pin), GFP_KERNEL);
if (!qe_pin) {
dev_dbg(dev, "%s: can't allocate memory\n", __func__);
return ERR_PTR(-ENOMEM);
}
/*
* Request gpio as nonexclusive as it was likely reserved by the
* caller, and we are not planning on controlling it, we only need
* the descriptor to the to the gpio chip structure.
*/
gpiod = gpiod_get_index(dev, NULL, index,
GPIOD_ASIS | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
err = PTR_ERR_OR_ZERO(gpiod);
if (err)
goto err0;
gc = gpiod_to_chip(gpiod);
gpio_num = desc_to_gpio(gpiod);
/* We no longer need this descriptor */
gpiod_put(gpiod);
if (WARN_ON(!gc)) {
err = -ENODEV;
goto err0;
}
qe_pin->controller = gpiochip_get_data(gc);
/*
* FIXME: this gets the local offset on the gpio_chip so that the driver
* can manipulate pin control settings through its custom API. The real
* solution is to create a real pin control driver for this.
*/
qe_pin->num = gpio_num - gc->base;
if (!fwnode_device_is_compatible(gc->fwnode, "fsl,mpc8323-qe-pario-bank")) {
dev_dbg(dev, "%s: tried to get a non-qe pin\n", __func__);
err = -EINVAL;
goto err0;
}
return qe_pin;
err0:
kfree(qe_pin);
dev_dbg(dev, "%s failed with status %d\n", __func__, err);
return ERR_PTR(err);
}
EXPORT_SYMBOL(qe_pin_request);
/**
* qe_pin_free - Free a pin
* @qe_pin: pointer to the qe_pin structure
* Context: any
*
* This function frees the qe_pin structure and makes a pin available
* for further qe_pin_request() calls.
*/
void qe_pin_free(struct qe_pin *qe_pin)
{
kfree(qe_pin);
}
EXPORT_SYMBOL(qe_pin_free);
/**
* qe_pin_set_dedicated - Revert a pin to a dedicated peripheral function mode
* @qe_pin: pointer to the qe_pin structure
* Context: any
*
* This function resets a pin to a dedicated peripheral function that
* has been set up by the firmware.
*/
void qe_pin_set_dedicated(struct qe_pin *qe_pin)
{
struct qe_gpio_chip *qe_gc = qe_pin->controller;
struct qe_pio_regs __iomem *regs = qe_gc->mm_gc.regs;
struct qe_pio_regs *sregs = &qe_gc->saved_regs;
int pin = qe_pin->num;
u32 mask1 = 1 << (QE_PIO_PINS - (pin + 1));
u32 mask2 = 0x3 << (QE_PIO_PINS - (pin % (QE_PIO_PINS / 2) + 1) * 2);
bool second_reg = pin > (QE_PIO_PINS / 2) - 1;
unsigned long flags;
spin_lock_irqsave(&qe_gc->lock, flags);
if (second_reg) {
qe_clrsetbits_be32(®s->cpdir2, mask2,
sregs->cpdir2 & mask2);
qe_clrsetbits_be32(®s->cppar2, mask2,
sregs->cppar2 & mask2);
} else {
qe_clrsetbits_be32(®s->cpdir1, mask2,
sregs->cpdir1 & mask2);
qe_clrsetbits_be32(®s->cppar1, mask2,
sregs->cppar1 & mask2);
}
if (sregs->cpdata & mask1)
qe_gc->cpdata |= mask1;
else
qe_gc->cpdata &= ~mask1;
iowrite32be(qe_gc->cpdata, ®s->cpdata);
qe_clrsetbits_be32(®s->cpodr, mask1, sregs->cpodr & mask1);
spin_unlock_irqrestore(&qe_gc->lock, flags);
}
EXPORT_SYMBOL(qe_pin_set_dedicated);
/**
* qe_pin_set_gpio - Set a pin to the GPIO mode
* @qe_pin: pointer to the qe_pin structure
* Context: any
*
* This function sets a pin to the GPIO mode.
*/
void qe_pin_set_gpio(struct qe_pin *qe_pin)
{
struct qe_gpio_chip *qe_gc = qe_pin->controller;
struct qe_pio_regs __iomem *regs = qe_gc->mm_gc.regs;
unsigned long flags;
spin_lock_irqsave(&qe_gc->lock, flags);
/* Let's make it input by default, GPIO API is able to change that. */
__par_io_config_pin(regs, qe_pin->num, QE_PIO_DIR_IN, 0, 0, 0);
spin_unlock_irqrestore(&qe_gc->lock, flags);
}
EXPORT_SYMBOL(qe_pin_set_gpio);
static int __init qe_add_gpiochips(void)
{
struct device_node *np;
for_each_compatible_node(np, NULL, "fsl,mpc8323-qe-pario-bank") {
int ret;
struct qe_gpio_chip *qe_gc;
struct of_mm_gpio_chip *mm_gc;
struct gpio_chip *gc;
qe_gc = kzalloc(sizeof(*qe_gc), GFP_KERNEL);
if (!qe_gc) {
ret = -ENOMEM;
goto err;
}
spin_lock_init(&qe_gc->lock);
mm_gc = &qe_gc->mm_gc;
gc = &mm_gc->gc;
mm_gc->save_regs = qe_gpio_save_regs;
gc->ngpio = QE_PIO_PINS;
gc->direction_input = qe_gpio_dir_in;
gc->direction_output = qe_gpio_dir_out;
gc->get = qe_gpio_get;
gc->set = qe_gpio_set;
gc->set_multiple = qe_gpio_set_multiple;
ret = of_mm_gpiochip_add_data(np, mm_gc, qe_gc);
if (ret)
goto err;
continue;
err:
pr_err("%pOF: registration failed with status %d\n",
np, ret);
kfree(qe_gc);
/* try others anyway */
}
return 0;
}
arch_initcall(qe_add_gpiochips);