On Mon, May 9, 2022 at 9:22 AM Biju Das <biju.das.jz@xxxxxxxxxxxxxx> wrote:
> > Subject: [PATCH v2 2/5] irqchip: Add RZ/G2L IA55 Interrupt Controller
> > driver
> >
> > Add a driver for the Renesas RZ/G2L Interrupt Controller.
> >
> > This supports external pins being used as interrupts. It supports one line
> > for NMI, 8 external pins and 32 GPIO pins (out of 123) to be used as IRQ
> > lines.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-renesas-rzg2l.c
> > +static void rzg2l_irqc_irq_disable(struct irq_data *d) {
> > + unsigned int hw_irq = irqd_to_hwirq(d);
> > +
> > + if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT) {
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + u32 offset = hw_irq - IRQC_TINT_START;
> > + u32 tssr_offset = TSSR_OFFSET(offset);
> > + u8 tssr_index = TSSR_INDEX(offset);
> > + u32 reg;
> > +
> > + raw_spin_lock(&priv->lock);
> > + reg = readl_relaxed(priv->base + TSSR(tssr_index));
> > + reg &= ~(TSSEL_MASK << tssr_offset);
> > + writel_relaxed(reg, priv->base + TSSR(tssr_index));
> > + raw_spin_unlock(&priv->lock);
> > + }
> > + irq_chip_disable_parent(d);
> > +}
> > +static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type) {
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + unsigned int hwirq = irqd_to_hwirq(d);
> > + u32 titseln = hwirq - IRQC_TINT_START;
> > + u32 offset;
> > + u8 sense;
> > + u32 reg;
> > +
> > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > + case IRQ_TYPE_EDGE_RISING:
> > + sense = TITSR_TITSEL_EDGE_RISING;
> > + break;
> > +
> > + case IRQ_TYPE_EDGE_FALLING:
> > + sense = TITSR_TITSEL_EDGE_FALLING;
> > + break;
> > +
> > + default:
> > + return -EINVAL;
> > + }
> > +
>
> > + if (titseln < TITSR0_MAX_INT) {
> > + offset = TITSR0;
> > + } else {
> > + titseln /= TITSEL_WIDTH;
> > + offset = TITSR1;
> > + }
>
> as TITSR0 (0x24) and TITSR1(0x28) are contiguous address location
>
> May be like others, above declare it as
> u32 offset = TITSR0; ??
>
> and here
> if ((titseln >= TITSR0_MAX_INT) {
> titseln /= TITSEL_WIDTH;
> offset += 4;
> }
Why "titseln /= TITSEL_WIDTH"?
Shouldn't that be "titseln -= TITSR0_MAX_INT"?
Do I need more coffee?
Can't you define TITSR_{OFFSET,INDEX}() helper macros, like for
TSSR above?
> > +
> > + raw_spin_lock(&priv->lock);
> > + reg = readl_relaxed(priv->base + offset);
> > + reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH));
> > + reg |= sense << (titseln * TITSEL_WIDTH);
> > + writel_relaxed(reg, priv->base + offset);
> > + raw_spin_unlock(&priv->lock);
> > +
> > + return 0;
> > +}
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
