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A series of fixes for the Renesas RZG21 interrupt chip driver to prevent

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spurious and misrouted interrupts.
 
   - Ensure that posted writes are flushed in the eoi() callback
 
   - Ensure that interrupts are masked at the chip level when the trigger
     type is changed
 
   - Clear the interrupt status register when setting up edge type trigger
     modes.
 
   - Ensure that the trigger type and routing information is set before the
     interrupt is enabled.
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Merge tag 'irq-urgent-2024-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "A series of fixes for the Renesas RZG21 interrupt chip driver to
  prevent spurious and misrouted interrupts.

   - Ensure that posted writes are flushed in the eoi() callback

   - Ensure that interrupts are masked at the chip level when the
     trigger type is changed

   - Clear the interrupt status register when setting up edge type
     trigger modes

   - Ensure that the trigger type and routing information is set before
     the interrupt is enabled"

* tag 'irq-urgent-2024-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/renesas-rzg2l: Do not set TIEN and TINT source at the same time
  irqchip/renesas-rzg2l: Prevent spurious interrupts when setting trigger type
  irqchip/renesas-rzg2l: Rename rzg2l_irq_eoi()
  irqchip/renesas-rzg2l: Rename rzg2l_tint_eoi()
  irqchip/renesas-rzg2l: Flush posted write in irq_eoi()
This commit is contained in:
Linus Torvalds 2024-03-23 14:30:38 -07:00
commit 1a39193137
1 changed files with 54 additions and 18 deletions
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72
drivers/irqchip/irq-renesas-rzg2l.c
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@ -85,10 +85,9 @@ static struct rzg2l_irqc_priv *irq_data_to_priv(struct irq_data *data)
return data->domain->host_data;
}
static void rzg2l_irq_eoi(struct irq_data *d)
static void rzg2l_clear_irq_int(struct rzg2l_irqc_priv *priv, unsigned int hwirq)
{
unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
unsigned int hw_irq = hwirq - IRQC_IRQ_START;
u32 bit = BIT(hw_irq);
u32 iitsr, iscr;
@ -99,20 +98,30 @@ static void rzg2l_irq_eoi(struct irq_data *d)
* ISCR can only be cleared if the type is falling-edge, rising-edge or
* falling/rising-edge.
*/
if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq))) {
writel_relaxed(iscr & ~bit, priv->base + ISCR);
/*
* Enforce that the posted write is flushed to prevent that the
* just handled interrupt is raised again.
*/
readl_relaxed(priv->base + ISCR);
}
}
static void rzg2l_tint_eoi(struct irq_data *d)
static void rzg2l_clear_tint_int(struct rzg2l_irqc_priv *priv, unsigned int hwirq)
{
unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_TINT_START;
struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
u32 bit = BIT(hw_irq);
u32 bit = BIT(hwirq - IRQC_TINT_START);
u32 reg;
reg = readl_relaxed(priv->base + TSCR);
if (reg & bit)
if (reg & bit) {
writel_relaxed(reg & ~bit, priv->base + TSCR);
/*
* Enforce that the posted write is flushed to prevent that the
* just handled interrupt is raised again.
*/
readl_relaxed(priv->base + TSCR);
}
}
static void rzg2l_irqc_eoi(struct irq_data *d)
@ -122,9 +131,9 @@ static void rzg2l_irqc_eoi(struct irq_data *d)
raw_spin_lock(&priv->lock);
if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
rzg2l_irq_eoi(d);
rzg2l_clear_irq_int(priv, hw_irq);
else if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ)
rzg2l_tint_eoi(d);
rzg2l_clear_tint_int(priv, hw_irq);
raw_spin_unlock(&priv->lock);
irq_chip_eoi_parent(d);
}
@ -142,7 +151,7 @@ static void rzg2l_irqc_irq_disable(struct irq_data *d)
raw_spin_lock(&priv->lock);
reg = readl_relaxed(priv->base + TSSR(tssr_index));
reg &= ~(TSSEL_MASK << TSSEL_SHIFT(tssr_offset));
reg &= ~(TIEN << TSSEL_SHIFT(tssr_offset));
writel_relaxed(reg, priv->base + TSSR(tssr_index));
raw_spin_unlock(&priv->lock);
}
@ -154,7 +163,6 @@ static void rzg2l_irqc_irq_enable(struct irq_data *d)
unsigned int hw_irq = irqd_to_hwirq(d);
if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) {
unsigned long tint = (uintptr_t)irq_data_get_irq_chip_data(d);
struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
u32 offset = hw_irq - IRQC_TINT_START;
u32 tssr_offset = TSSR_OFFSET(offset);
@ -163,7 +171,7 @@ static void rzg2l_irqc_irq_enable(struct irq_data *d)
raw_spin_lock(&priv->lock);
reg = readl_relaxed(priv->base + TSSR(tssr_index));
reg |= (TIEN | tint) << TSSEL_SHIFT(tssr_offset);
reg |= TIEN << TSSEL_SHIFT(tssr_offset);
writel_relaxed(reg, priv->base + TSSR(tssr_index));
raw_spin_unlock(&priv->lock);
}
@ -172,8 +180,10 @@ static void rzg2l_irqc_irq_enable(struct irq_data *d)
static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type)
{
unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
unsigned int hwirq = irqd_to_hwirq(d);
u32 iitseln = hwirq - IRQC_IRQ_START;
bool clear_irq_int = false;
u16 sense, tmp;
switch (type & IRQ_TYPE_SENSE_MASK) {
@ -183,14 +193,17 @@ static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type)
case IRQ_TYPE_EDGE_FALLING:
sense = IITSR_IITSEL_EDGE_FALLING;
clear_irq_int = true;
break;
case IRQ_TYPE_EDGE_RISING:
sense = IITSR_IITSEL_EDGE_RISING;
clear_irq_int = true;
break;
case IRQ_TYPE_EDGE_BOTH:
sense = IITSR_IITSEL_EDGE_BOTH;
clear_irq_int = true;
break;
default:
@ -199,21 +212,40 @@ static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type)
raw_spin_lock(&priv->lock);
tmp = readl_relaxed(priv->base + IITSR);
tmp &= ~IITSR_IITSEL_MASK(hw_irq);
tmp |= IITSR_IITSEL(hw_irq, sense);
tmp &= ~IITSR_IITSEL_MASK(iitseln);
tmp |= IITSR_IITSEL(iitseln, sense);
if (clear_irq_int)
rzg2l_clear_irq_int(priv, hwirq);
writel_relaxed(tmp, priv->base + IITSR);
raw_spin_unlock(&priv->lock);
return 0;
}
static u32 rzg2l_disable_tint_and_set_tint_source(struct irq_data *d, struct rzg2l_irqc_priv *priv,
u32 reg, u32 tssr_offset, u8 tssr_index)
{
u32 tint = (u32)(uintptr_t)irq_data_get_irq_chip_data(d);
u32 tien = reg & (TIEN << TSSEL_SHIFT(tssr_offset));
/* Clear the relevant byte in reg */
reg &= ~(TSSEL_MASK << TSSEL_SHIFT(tssr_offset));
/* Set TINT and leave TIEN clear */
reg |= tint << TSSEL_SHIFT(tssr_offset);
writel_relaxed(reg, priv->base + TSSR(tssr_index));
return reg | tien;
}
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 tssr_offset = TSSR_OFFSET(titseln);
u8 tssr_index = TSSR_INDEX(titseln);
u8 index, sense;
u32 reg;
u32 reg, tssr;
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
@ -235,10 +267,14 @@ static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type)
}
raw_spin_lock(&priv->lock);
tssr = readl_relaxed(priv->base + TSSR(tssr_index));
tssr = rzg2l_disable_tint_and_set_tint_source(d, priv, tssr, tssr_offset, tssr_index);
reg = readl_relaxed(priv->base + TITSR(index));
reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH));
reg |= sense << (titseln * TITSEL_WIDTH);
writel_relaxed(reg, priv->base + TITSR(index));
rzg2l_clear_tint_int(priv, hwirq);
writel_relaxed(tssr, priv->base + TSSR(tssr_index));
raw_spin_unlock(&priv->lock);
return 0;