arch/mips/bcm63xx/gpio.c

Source file repositories/reference/linux-study-clean/arch/mips/bcm63xx/gpio.c

File Facts

System
Linux kernel
Corpus path
arch/mips/bcm63xx/gpio.c
Extension
.c
Size
3240 bytes
Lines
150
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/gpio/driver.h>

#include <bcm63xx_cpu.h>
#include <bcm63xx_gpio.h>
#include <bcm63xx_io.h>
#include <bcm63xx_regs.h>

static u32 gpio_out_low_reg;

static void bcm63xx_gpio_out_low_reg_init(void)
{
	switch (bcm63xx_get_cpu_id()) {
	case BCM6345_CPU_ID:
		gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
		break;
	default:
		gpio_out_low_reg = GPIO_DATA_LO_REG;
		break;
	}
}

static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
static u32 gpio_out_low, gpio_out_high;

static int bcm63xx_gpio_set(struct gpio_chip *chip, unsigned int gpio, int val)
{
	u32 reg;
	u32 mask;
	u32 *v;
	unsigned long flags;

	BUG_ON(gpio >= chip->ngpio);

	if (gpio < 32) {
		reg = gpio_out_low_reg;
		mask = 1 << gpio;
		v = &gpio_out_low;
	} else {
		reg = GPIO_DATA_HI_REG;
		mask = 1 << (gpio - 32);
		v = &gpio_out_high;
	}

	spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
	if (val)
		*v |= mask;
	else
		*v &= ~mask;
	bcm_gpio_writel(*v, reg);
	spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);

	return 0;
}

static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
	u32 reg;
	u32 mask;

	BUG_ON(gpio >= chip->ngpio);

	if (gpio < 32) {
		reg = gpio_out_low_reg;
		mask = 1 << gpio;
	} else {
		reg = GPIO_DATA_HI_REG;
		mask = 1 << (gpio - 32);
	}

	return !!(bcm_gpio_readl(reg) & mask);
}

static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
				      unsigned gpio, int dir)
{
	u32 reg;
	u32 mask;
	u32 tmp;
	unsigned long flags;

	BUG_ON(gpio >= chip->ngpio);

	if (gpio < 32) {
		reg = GPIO_CTL_LO_REG;
		mask = 1 << gpio;
	} else {

Annotation

Implementation Notes