000af2c5a8
Support for the Stretch S6000 Xtensa core variant. Signed-off-by: Johannes Weiner <jw@emlix.com> Signed-off-by: Oskar Schirmer <os@emlix.com> Signed-off-by: Chris Zankel <chris@zankel.net>
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/*
|
|
* s6000 irq crossbar
|
|
*
|
|
* Copyright (c) 2009 emlix GmbH
|
|
* Authors: Johannes Weiner <jw@emlix.com>
|
|
* Oskar Schirmer <os@emlix.com>
|
|
*/
|
|
#include <linux/io.h>
|
|
#include <asm/irq.h>
|
|
#include <variant/hardware.h>
|
|
|
|
/* S6_REG_INTC */
|
|
#define INTC_STATUS 0x000
|
|
#define INTC_RAW 0x010
|
|
#define INTC_STATUS_AG 0x100
|
|
#define INTC_CFG(n) (0x200 + 4 * (n))
|
|
|
|
/*
|
|
* The s6000 has a crossbar that multiplexes interrupt output lines
|
|
* from the peripherals to input lines on the xtensa core.
|
|
*
|
|
* We leave the mapping decisions to the platform as it depends on the
|
|
* actually connected peripherals which distribution makes sense.
|
|
*/
|
|
extern const signed char *platform_irq_mappings[NR_IRQS];
|
|
|
|
static unsigned long scp_to_intc_enable[] = {
|
|
#define TO_INTC_ENABLE(n) (((n) << 1) + 1)
|
|
TO_INTC_ENABLE(0),
|
|
TO_INTC_ENABLE(1),
|
|
TO_INTC_ENABLE(2),
|
|
TO_INTC_ENABLE(3),
|
|
TO_INTC_ENABLE(4),
|
|
TO_INTC_ENABLE(5),
|
|
TO_INTC_ENABLE(6),
|
|
TO_INTC_ENABLE(7),
|
|
TO_INTC_ENABLE(8),
|
|
TO_INTC_ENABLE(9),
|
|
TO_INTC_ENABLE(10),
|
|
TO_INTC_ENABLE(11),
|
|
TO_INTC_ENABLE(12),
|
|
-1,
|
|
-1,
|
|
TO_INTC_ENABLE(13),
|
|
-1,
|
|
TO_INTC_ENABLE(14),
|
|
-1,
|
|
TO_INTC_ENABLE(15),
|
|
#undef TO_INTC_ENABLE
|
|
};
|
|
|
|
static void irq_set(unsigned int irq, int enable)
|
|
{
|
|
unsigned long en;
|
|
const signed char *m = platform_irq_mappings[irq];
|
|
|
|
if (!m)
|
|
return;
|
|
en = enable ? scp_to_intc_enable[irq] : 0;
|
|
while (*m >= 0) {
|
|
writel(en, S6_REG_INTC + INTC_CFG(*m));
|
|
m++;
|
|
}
|
|
}
|
|
|
|
void variant_irq_enable(unsigned int irq)
|
|
{
|
|
irq_set(irq, 1);
|
|
}
|
|
|
|
void variant_irq_disable(unsigned int irq)
|
|
{
|
|
irq_set(irq, 0);
|
|
}
|