Commit ed6f5987 authored by Uwe Kleine-König's avatar Uwe Kleine-König
Browse files

ns9xxx: add support for irq priorisation 



prio2irq(0) is the highest prioritized interrupt.  For now there is no
binary change intended.

If you intend to change the priorisation, you have to assert:

	∀ x ∈ {0, 1, ⋯ 31}: (irq2prio ∘ prio2irq)(x) = x

Signed-off-by: default avatarUwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
parent 5e69b945

arch/arm/mach-ns9xxx/irq.c

+18 −12
Original line number Diff line number Diff line
@@ -19,12 +19,17 @@ 


#include "generic.h"



/* simple interrupt prio table: prio(x) < prio(y) <=> x < y */

#define irq2prio(i) (i)

#define prio2irq(p) (p)



static void ns9xxx_mask_irq(unsigned int irq)

{

	/* XXX: better use cpp symbols */

	u32 ic = __raw_readl(SYS_IC(irq / 4));

	ic &= ~(1 << (7 + 8 * (3 - (irq & 3))));

	__raw_writel(ic, SYS_IC(irq / 4));

	int prio = irq2prio(irq);

	u32 ic = __raw_readl(SYS_IC(prio / 4));

	ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));

	__raw_writel(ic, SYS_IC(prio / 4));

}



static void ns9xxx_ack_irq(unsigned int irq)
@@ -41,9 +46,10 @@ static void ns9xxx_maskack_irq(unsigned int irq) 
static void ns9xxx_unmask_irq(unsigned int irq)

{

	/* XXX: better use cpp symbols */

	u32 ic = __raw_readl(SYS_IC(irq / 4));

	ic |= 1 << (7 + 8 * (3 - (irq & 3)));

	__raw_writel(ic, SYS_IC(irq / 4));

	int prio = irq2prio(irq);

	u32 ic = __raw_readl(SYS_IC(prio / 4));

	ic |= 1 << (7 + 8 * (3 - (prio & 3)));

	__raw_writel(ic, SYS_IC(prio / 4));

}



static struct irq_chip ns9xxx_chip = {
@@ -96,14 +102,14 @@ void __init ns9xxx_init_irq(void) 


	/* disable all IRQs */

	for (i = 0; i < 8; ++i)

		__raw_writel((4 * i) << 24 | (4 * i + 1) << 16 |

				(4 * i + 2) << 8 | (4 * i + 3), SYS_IC(i));

		__raw_writel(prio2irq(4 * i) << 24 |

				prio2irq(4 * i + 1) << 16 |

				prio2irq(4 * i + 2) << 8 |

				prio2irq(4 * i + 3),

				SYS_IC(i));



	/* simple interrupt prio table:

	 * prio(x) < prio(y) <=> x < y

	 */

	for (i = 0; i < 32; ++i)

		__raw_writel(i, SYS_IVA(i));

		__raw_writel(prio2irq(i), SYS_IVA(i));



	for (i = 0; i <= 31; ++i) {

		set_irq_chip(i, &ns9xxx_chip);

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