hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
linux-sg2042/drivers/pinctrl/pinctrl-coh901.c

781 lines
20 KiB
C
Raw Blame History

/*
* U300 GPIO module.
*
* Copyright (C) 2007-2012 ST-Ericsson AB
* License terms: GNU General Public License (GPL) version 2
* COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
* Author: Linus Walleij <linus.walleij@linaro.org>
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinconf-generic.h>
#include "pinctrl-coh901.h"
#define U300_GPIO_PORT_STRIDE (0x30)
/*
* Control Register 32bit (R/W)
* bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores
* gives the number of GPIO pins.
* bit 8-2 (mask 0x000001FC) contains the core version ID.
*/
#define U300_GPIO_CR (0x00)
#define U300_GPIO_CR_SYNC_SEL_ENABLE (0x00000002UL)
#define U300_GPIO_CR_BLOCK_CLKRQ_ENABLE (0x00000001UL)
#define U300_GPIO_PXPDIR (0x04)
#define U300_GPIO_PXPDOR (0x08)
#define U300_GPIO_PXPCR (0x0C)
#define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK (0x0000FFFFUL)
#define U300_GPIO_PXPCR_PIN_MODE_MASK (0x00000003UL)
#define U300_GPIO_PXPCR_PIN_MODE_SHIFT (0x00000002UL)
#define U300_GPIO_PXPCR_PIN_MODE_INPUT (0x00000000UL)
#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL (0x00000001UL)
#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN (0x00000002UL)
#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE (0x00000003UL)
#define U300_GPIO_PXPER (0x10)
#define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK (0x000000FFUL)
#define U300_GPIO_PXPER_PULL_UP_DISABLE (0x00000001UL)
#define U300_GPIO_PXIEV (0x14)
#define U300_GPIO_PXIEN (0x18)
#define U300_GPIO_PXIFR (0x1C)
#define U300_GPIO_PXICR (0x20)
#define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK (0x000000FFUL)
#define U300_GPIO_PXICR_IRQ_CONFIG_MASK (0x00000001UL)
#define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE (0x00000000UL)
#define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE (0x00000001UL)
/* 8 bits per port, no version has more than 7 ports */
#define U300_GPIO_NUM_PORTS 7
#define U300_GPIO_PINS_PER_PORT 8
#define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS)
struct u300_gpio_port {
struct u300_gpio *gpio;
char name[8];
int irq;
int number;
u8 toggle_edge_mode;
};
struct u300_gpio {
struct gpio_chip chip;
struct u300_gpio_port ports[U300_GPIO_NUM_PORTS];
struct clk *clk;
void __iomem *base;
struct device *dev;
u32 stride;
/* Register offsets */
u32 pcr;
u32 dor;
u32 dir;
u32 per;
u32 icr;
u32 ien;
u32 iev;
};
/*
* Macro to expand to read a specific register found in the "gpio"
* struct. It requires the struct u300_gpio *gpio variable to exist in
* its context. It calculates the port offset from the given pin
* offset, muliplies by the port stride and adds the register offset
* so it provides a pointer to the desired register.
*/
#define U300_PIN_REG(pin, reg) \
(gpio->base + (pin >> 3) * gpio->stride + gpio->reg)
/*
* Provides a bitmask for a specific gpio pin inside an 8-bit GPIO
* register.
*/
#define U300_PIN_BIT(pin) \
(1 << (pin & 0x07))
struct u300_gpio_confdata {
u16 bias_mode;
bool output;
int outval;
};
#define U300_FLOATING_INPUT { \
.bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \
.output = false, \
}
#define U300_PULL_UP_INPUT { \
.bias_mode = PIN_CONFIG_BIAS_PULL_UP, \
.output = false, \
}
#define U300_OUTPUT_LOW { \
.output = true, \
.outval = 0, \
}
#define U300_OUTPUT_HIGH { \
.output = true, \
.outval = 1, \
}
/* Initial configuration */
static const struct u300_gpio_confdata __initconst
bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
/* Port 0, pins 0-7 */
{
U300_FLOATING_INPUT,
U300_OUTPUT_HIGH,
U300_FLOATING_INPUT,
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
},
/* Port 1, pins 0-7 */
{
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
U300_PULL_UP_INPUT,
U300_FLOATING_INPUT,
U300_OUTPUT_HIGH,
U300_OUTPUT_LOW,
U300_OUTPUT_LOW,
},
/* Port 2, pins 0-7 */
{
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_OUTPUT_LOW,
U300_PULL_UP_INPUT,
U300_OUTPUT_LOW,
U300_PULL_UP_INPUT,
},
/* Port 3, pins 0-7 */
{
U300_PULL_UP_INPUT,
U300_OUTPUT_LOW,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
},
/* Port 4, pins 0-7 */
{
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
},
/* Port 5, pins 0-7 */
{
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
},
/* Port 6, pind 0-7 */
{
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
U300_FLOATING_INPUT,
}
};
static int u300_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct u300_gpio *gpio = gpiochip_get_data(chip);
return !!(readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset));
}
static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct u300_gpio *gpio = gpiochip_get_data(chip);
unsigned long flags;
u32 val;
local_irq_save(flags);
val = readl(U300_PIN_REG(offset, dor));
if (value)
writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
else
writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
local_irq_restore(flags);
}
static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct u300_gpio *gpio = gpiochip_get_data(chip);
unsigned long flags;
u32 val;
local_irq_save(flags);
val = readl(U300_PIN_REG(offset, pcr));
/* Mask out this pin, note 2 bits per setting */
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
writel(val, U300_PIN_REG(offset, pcr));
local_irq_restore(flags);
return 0;
}
static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct u300_gpio *gpio = gpiochip_get_data(chip);
unsigned long flags;
u32 oldmode;
u32 val;
local_irq_save(flags);
val = readl(U300_PIN_REG(offset, pcr));
/*
* Drive mode must be set by the special mode set function, set
* push/pull mode by default if no mode has been selected.
*/
oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK <<
((offset & 0x07) << 1));
/* mode = 0 means input, else some mode is already set */
if (oldmode == 0) {
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK <<
((offset & 0x07) << 1));
val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
<< ((offset & 0x07) << 1));
writel(val, U300_PIN_REG(offset, pcr));
}
u300_gpio_set(chip, offset, value);
local_irq_restore(flags);
return 0;
}
/* Returning -EINVAL means "supported but not available" */
int u300_gpio_config_get(struct gpio_chip *chip,
unsigned offset,
unsigned long *config)
{
struct u300_gpio *gpio = gpiochip_get_data(chip);
enum pin_config_param param = (enum pin_config_param) *config;
bool biasmode;
u32 drmode;
/* One bit per pin, clamp to bool range */
biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset));
/* Mask out the two bits for this pin and shift to bits 0,1 */
drmode = readl(U300_PIN_REG(offset, pcr));
drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
drmode >>= ((offset & 0x07) << 1);
switch (param) {
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
*config = 0;
if (biasmode)
return 0;
else
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_UP:
*config = 0;
if (!biasmode)
return 0;
else
return -EINVAL;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
*config = 0;
if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL)
return 0;
else
return -EINVAL;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
*config = 0;
if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN)
return 0;
else
return -EINVAL;
break;
case PIN_CONFIG_DRIVE_OPEN_SOURCE:
*config = 0;
if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE)
return 0;
else
return -EINVAL;
break;
default:
break;
}
return -ENOTSUPP;
}
int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset,
enum pin_config_param param)
{
struct u300_gpio *gpio = gpiochip_get_data(chip);
unsigned long flags;
u32 val;
local_irq_save(flags);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
val = readl(U300_PIN_REG(offset, per));
writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
break;
case PIN_CONFIG_BIAS_PULL_UP:
val = readl(U300_PIN_REG(offset, per));
writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
val = readl(U300_PIN_REG(offset, pcr));
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
<< ((offset & 0x07) << 1));
val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
<< ((offset & 0x07) << 1));
writel(val, U300_PIN_REG(offset, pcr));
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
val = readl(U300_PIN_REG(offset, pcr));
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
<< ((offset & 0x07) << 1));
val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN
<< ((offset & 0x07) << 1));
writel(val, U300_PIN_REG(offset, pcr));
break;
case PIN_CONFIG_DRIVE_OPEN_SOURCE:
val = readl(U300_PIN_REG(offset, pcr));
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
<< ((offset & 0x07) << 1));
val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE
<< ((offset & 0x07) << 1));
writel(val, U300_PIN_REG(offset, pcr));
break;
default:
local_irq_restore(flags);
dev_err(gpio->dev, "illegal configuration requested\n");
return -EINVAL;
}
local_irq_restore(flags);
return 0;
}
static const struct gpio_chip u300_gpio_chip = {
.label = "u300-gpio-chip",
.owner = THIS_MODULE,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.get = u300_gpio_get,
.set = u300_gpio_set,
.direction_input = u300_gpio_direction_input,
.direction_output = u300_gpio_direction_output,
};
static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
{
u32 val;
val = readl(U300_PIN_REG(offset, icr));
/* Set mode depending on state */
if (u300_gpio_get(&gpio->chip, offset)) {
/* High now, let's trigger on falling edge next then */
writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n",
offset);
} else {
/* Low now, let's trigger on rising edge next then */
writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n",
offset);
}
}
static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct u300_gpio *gpio = gpiochip_get_data(chip);
struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
int offset = d->hwirq;
u32 val;
if ((trigger & IRQF_TRIGGER_RISING) &&
(trigger & IRQF_TRIGGER_FALLING)) {
/*
* The GPIO block can only trigger on falling OR rising edges,
* not both. So we need to toggle the mode whenever the pin
* goes from one state to the other with a special state flag
*/
dev_dbg(gpio->dev,
"trigger on both rising and falling edge on pin %d\n",
offset);
port->toggle_edge_mode |= U300_PIN_BIT(offset);
u300_toggle_trigger(gpio, offset);
} else if (trigger & IRQF_TRIGGER_RISING) {
dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n",
offset);
val = readl(U300_PIN_REG(offset, icr));
writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
} else if (trigger & IRQF_TRIGGER_FALLING) {
dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n",
offset);
val = readl(U300_PIN_REG(offset, icr));
writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
}
return 0;
}
static void u300_gpio_irq_enable(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct u300_gpio *gpio = gpiochip_get_data(chip);
struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
int offset = d->hwirq;
u32 val;
unsigned long flags;
dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n",
d->hwirq, port->name, offset);
local_irq_save(flags);
val = readl(U300_PIN_REG(offset, ien));
writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
local_irq_restore(flags);
}
static void u300_gpio_irq_disable(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct u300_gpio *gpio = gpiochip_get_data(chip);
int offset = d->hwirq;
u32 val;
unsigned long flags;
local_irq_save(flags);
val = readl(U300_PIN_REG(offset, ien));
writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
local_irq_restore(flags);
}
static struct irq_chip u300_gpio_irqchip = {
.name = "u300-gpio-irqchip",
.irq_enable = u300_gpio_irq_enable,
.irq_disable = u300_gpio_irq_disable,
.irq_set_type = u300_gpio_irq_type,
};
static void u300_gpio_irq_handler(struct irq_desc *desc)
{
unsigned int irq = irq_desc_get_irq(desc);
struct irq_chip *parent_chip = irq_desc_get_chip(desc);
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
struct u300_gpio *gpio = gpiochip_get_data(chip);
struct u300_gpio_port *port = &gpio->ports[irq - chip->base];
int pinoffset = port->number << 3; /* get the right stride */
unsigned long val;
chained_irq_enter(parent_chip, desc);
/* Read event register */
val = readl(U300_PIN_REG(pinoffset, iev));
/* Mask relevant bits */
val &= 0xFFU; /* 8 bits per port */
/* ACK IRQ (clear event) */
writel(val, U300_PIN_REG(pinoffset, iev));
/* Call IRQ handler */
if (val != 0) {
int irqoffset;
for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
int offset = pinoffset + irqoffset;
int pin_irq = irq_find_mapping(chip->irqdomain, offset);
dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
pin_irq, offset);
generic_handle_irq(pin_irq);
/*
* Triggering IRQ on both rising and falling edge
* needs mockery
*/
if (port->toggle_edge_mode & U300_PIN_BIT(offset))
u300_toggle_trigger(gpio, offset);
}
}
chained_irq_exit(parent_chip, desc);
}
static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
int offset,
const struct u300_gpio_confdata *conf)
{
/* Set mode: input or output */
if (conf->output) {
u300_gpio_direction_output(&gpio->chip, offset, conf->outval);
/* Deactivate bias mode for output */
u300_gpio_config_set(&gpio->chip, offset,
PIN_CONFIG_BIAS_HIGH_IMPEDANCE);
/* Set drive mode for output */
u300_gpio_config_set(&gpio->chip, offset,
PIN_CONFIG_DRIVE_PUSH_PULL);
dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n",
offset, conf->outval);
} else {
u300_gpio_direction_input(&gpio->chip, offset);
/* Always set output low on input pins */
u300_gpio_set(&gpio->chip, offset, 0);
/* Set bias mode for input */
u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode);
dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n",
offset, conf->bias_mode);
}
}
static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio)
{
int i, j;
/* Write default config and values to all pins */
for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
for (j = 0; j < 8; j++) {
const struct u300_gpio_confdata *conf;
int offset = (i*8) + j;
conf = &bs335_gpio_config[i][j];
u300_gpio_init_pin(gpio, offset, conf);
}
}
}
/*
* Here we map a GPIO in the local gpio_chip pin space to a pin in
* the local pinctrl pin space. The pin controller used is
* pinctrl-u300.
*/
struct coh901_pinpair {
unsigned int offset;
unsigned int pin_base;
};
#define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b }
static struct coh901_pinpair coh901_pintable[] = {
COH901_PINRANGE(10, 426),
COH901_PINRANGE(11, 180),
COH901_PINRANGE(12, 165), /* MS/MMC card insertion */
COH901_PINRANGE(13, 179),
COH901_PINRANGE(14, 178),
COH901_PINRANGE(16, 194),
COH901_PINRANGE(17, 193),
COH901_PINRANGE(18, 192),
COH901_PINRANGE(19, 191),
COH901_PINRANGE(20, 186),
COH901_PINRANGE(21, 185),
COH901_PINRANGE(22, 184),
COH901_PINRANGE(23, 183),
COH901_PINRANGE(24, 182),
COH901_PINRANGE(25, 181),
};
static int __init u300_gpio_probe(struct platform_device *pdev)
{
struct u300_gpio *gpio;
struct resource *memres;
int err = 0;
int portno;
u32 val;
u32 ifr;
int i;
gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL);
if (gpio == NULL)
return -ENOMEM;
gpio->chip = u300_gpio_chip;
gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT;
gpio->chip.parent = &pdev->dev;
gpio->chip.base = 0;
gpio->dev = &pdev->dev;
memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
gpio->base = devm_ioremap_resource(&pdev->dev, memres);
if (IS_ERR(gpio->base))
return PTR_ERR(gpio->base);
gpio->clk = devm_clk_get(gpio->dev, NULL);
if (IS_ERR(gpio->clk)) {
err = PTR_ERR(gpio->clk);
dev_err(gpio->dev, "could not get GPIO clock\n");
return err;
}
err = clk_prepare_enable(gpio->clk);
if (err) {
dev_err(gpio->dev, "could not enable GPIO clock\n");
return err;
}
dev_info(gpio->dev,
"initializing GPIO Controller COH 901 571/3\n");
gpio->stride = U300_GPIO_PORT_STRIDE;
gpio->pcr = U300_GPIO_PXPCR;
gpio->dor = U300_GPIO_PXPDOR;
gpio->dir = U300_GPIO_PXPDIR;
gpio->per = U300_GPIO_PXPER;
gpio->icr = U300_GPIO_PXICR;
gpio->ien = U300_GPIO_PXIEN;
gpio->iev = U300_GPIO_PXIEV;
ifr = U300_GPIO_PXIFR;
val = readl(gpio->base + U300_GPIO_CR);
dev_info(gpio->dev, "COH901571/3 block version: %d, " \
"number of cores: %d totalling %d pins\n",
((val & 0x000001FC) >> 2),
((val & 0x0000FE00) >> 9),
((val & 0x0000FE00) >> 9) * 8);
writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE,
gpio->base + U300_GPIO_CR);
u300_gpio_init_coh901571(gpio);
#ifdef CONFIG_OF_GPIO
gpio->chip.of_node = pdev->dev.of_node;
#endif
err = gpiochip_add_data(&gpio->chip, gpio);
if (err) {
dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
goto err_no_chip;
}
err = gpiochip_irqchip_add(&gpio->chip,
&u300_gpio_irqchip,
0,
handle_simple_irq,
IRQ_TYPE_EDGE_FALLING);
if (err) {
dev_err(gpio->dev, "no GPIO irqchip\n");
goto err_no_irqchip;
}
/* Add each port with its IRQ separately */
for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) {
struct u300_gpio_port *port = &gpio->ports[portno];
snprintf(port->name, 8, "gpio%d", portno);
port->number = portno;
port->gpio = gpio;
port->irq = platform_get_irq(pdev, portno);
gpiochip_set_chained_irqchip(&gpio->chip,
&u300_gpio_irqchip,
port->irq,
u300_gpio_irq_handler);
/* Turns off irq force (test register) for this port */
writel(0x0, gpio->base + portno * gpio->stride + ifr);
}
dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);
/*
* Add pinctrl pin ranges, the pin controller must be registered
* at this point
*/
for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) {
struct coh901_pinpair *p = &coh901_pintable[i];
err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300",
p->offset, p->pin_base, 1);
if (err)
goto err_no_range;
}
platform_set_drvdata(pdev, gpio);
return 0;
err_no_range:
err_no_irqchip:
gpiochip_remove(&gpio->chip);
err_no_chip:
clk_disable_unprepare(gpio->clk);
dev_err(&pdev->dev, "module ERROR:%d\n", err);
return err;
}
static int __exit u300_gpio_remove(struct platform_device *pdev)
{
struct u300_gpio *gpio = platform_get_drvdata(pdev);
/* Turn off the GPIO block */
writel(0x00000000U, gpio->base + U300_GPIO_CR);
gpiochip_remove(&gpio->chip);
clk_disable_unprepare(gpio->clk);
return 0;
}
static const struct of_device_id u300_gpio_match[] = {
{ .compatible = "stericsson,gpio-coh901" },
{},
};
static struct platform_driver u300_gpio_driver = {
.driver = {
.name = "u300-gpio",
.of_match_table = u300_gpio_match,
},
.remove = __exit_p(u300_gpio_remove),
};
static int __init u300_gpio_init(void)
{
return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
}
static void __exit u300_gpio_exit(void)
{
platform_driver_unregister(&u300_gpio_driver);
}
arch_initcall(u300_gpio_init);
module_exit(u300_gpio_exit);
MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink