static void __em_gio_set(struct gpio_chip *chip, unsigned int reg,
unsigned shift, int value)
{
/* upper 16 bits contains mask and lower 16 actual value */
em_gio_write(gpio_to_priv(chip), reg,
(BIT(shift + 16)) | (value << shift));
}
static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
/* write GPIO value to output before selecting output mode of pin */
em_gio_set(chip, offset, value);
em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset));
return 0;
}
static int em_gio_irq_set_type(struct irq_data *d, unsigned int type)
{
unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK];
struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
unsigned int reg, offset, shift;
unsigned long flags;
unsigned long tmp;
if (!value)
return -EINVAL;
offset = irqd_to_hwirq(d);
pr_debug("gio: sense irq = %d, mode = %d\n", offset, value);
/* 8 x 4 bit fields in 4 IDT registers */
reg = GIO_IDT(offset >> 3);
shift = (offset & 0x07) << 4;
spin_lock_irqsave(&p->sense_lock, flags);
/* disable the interrupt in IIA */
tmp = em_gio_read(p, GIO_IIA);
tmp &= ~BIT(offset);
em_gio_write(p, GIO_IIA, tmp);
/* change the sense setting in IDT */
tmp = em_gio_read(p, reg);
tmp &= ~(0xf << shift);
tmp |= value << shift;
em_gio_write(p, reg, tmp);
/* clear pending interrupts */
em_gio_write(p, GIO_IIR, BIT(offset));
/* enable the interrupt in IIA */
tmp = em_gio_read(p, GIO_IIA);
tmp |= BIT(offset);
em_gio_write(p, GIO_IIA, tmp);
spin_unlock_irqrestore(&p->sense_lock, flags);
return 0;
}
static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
{
struct em_gio_priv *p = dev_id;
unsigned long pending;
unsigned int offset, irqs_handled = 0;
while ((pending = em_gio_read(p, GIO_MST))) {
offset = __ffs(pending);
em_gio_write(p, GIO_IIR, BIT(offset));
generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
irqs_handled++;
}
return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
}
static void em_gio_irq_enable(struct irq_data *d)
{
struct em_gio_priv *p = irq_data_get_irq_chip_data(d);
em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d)));
}
static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
{
em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset));
return 0;
}
static void em_gio_irq_disable(struct irq_data *d)
{
struct em_gio_priv *p = irq_to_priv(d);
em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d)));
}