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ARM: davinci: cp_intc: Add irq domain support

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Add irq domain support for DaVinci cp_intc.

Boot tested on AM18x EVM. Also tested with GPIO IRQ support on
AM18x EVM.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
[nsekhar@ti.com: add commit description, select IRQ_DOMAIN for CP_INTC
in Kconfig]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Heiko Schocher 2012-05-30 12:18:57 +02:00 committed by Sekhar Nori
parent 485802a6c5
commit 07caba966d
2 changed files with 50 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-davinci/Kconfig
View File

@ -4,6 +4,7 @@ config AINTC
bool
config CP_INTC
select IRQ_DOMAIN
bool
config ARCH_DAVINCI_DMx

63
arch/arm/mach-davinci/cp_intc.c
View File

@ -9,8 +9,10 @@
* kind, whether express or implied.
*/
#include <linux/export.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <mach/common.h>
@ -28,7 +30,7 @@ static inline void cp_intc_write(unsigned long value, unsigned offset)
static void cp_intc_ack_irq(struct irq_data *d)
{
cp_intc_write(d->irq, CP_INTC_SYS_STAT_IDX_CLR);
cp_intc_write(d->hwirq, CP_INTC_SYS_STAT_IDX_CLR);
}
/* Disable interrupt */
@ -36,20 +38,20 @@ static void cp_intc_mask_irq(struct irq_data *d)
{
/* XXX don't know why we need to disable nIRQ here... */
cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_CLR);
cp_intc_write(d->irq, CP_INTC_SYS_ENABLE_IDX_CLR);
cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_CLR);
cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET);
}
/* Enable interrupt */
static void cp_intc_unmask_irq(struct irq_data *d)
{
cp_intc_write(d->irq, CP_INTC_SYS_ENABLE_IDX_SET);
cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_SET);
}
static int cp_intc_set_irq_type(struct irq_data *d, unsigned int flow_type)
{
unsigned reg = BIT_WORD(d->irq);
unsigned mask = BIT_MASK(d->irq);
unsigned reg = BIT_WORD(d->hwirq);
unsigned mask = BIT_MASK(d->hwirq);
unsigned polarity = cp_intc_read(CP_INTC_SYS_POLARITY(reg));
unsigned type = cp_intc_read(CP_INTC_SYS_TYPE(reg));
@ -99,18 +101,36 @@ static struct irq_chip cp_intc_irq_chip = {
.irq_set_wake = cp_intc_set_wake,
};
void __init cp_intc_init(void)
static struct irq_domain *cp_intc_domain;
static int cp_intc_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
unsigned long num_irq = davinci_soc_info.intc_irq_num;
pr_debug("cp_intc_host_map(%d, 0x%lx)\n", virq, hw);
irq_set_chip(virq, &cp_intc_irq_chip);
set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
irq_set_handler(virq, handle_edge_irq);
return 0;
}
static const struct irq_domain_ops cp_intc_host_ops = {
.map = cp_intc_host_map,
.xlate = irq_domain_xlate_onetwocell,
};
int __init __cp_intc_init(struct device_node *node)
{
u32 num_irq = davinci_soc_info.intc_irq_num;
u8 *irq_prio = davinci_soc_info.intc_irq_prios;
u32 *host_map = davinci_soc_info.intc_host_map;
unsigned num_reg = BITS_TO_LONGS(num_irq);
int i;
int i, irq_base;
davinci_intc_type = DAVINCI_INTC_TYPE_CP_INTC;
davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_8K);
if (WARN_ON(!davinci_intc_base))
return;
return -EINVAL;
cp_intc_write(0, CP_INTC_GLOBAL_ENABLE);
@ -165,13 +185,28 @@ void __init cp_intc_init(void)
for (i = 0; host_map[i] != -1; i++)
cp_intc_write(host_map[i], CP_INTC_HOST_MAP(i));
/* Set up genirq dispatching for cp_intc */
for (i = 0; i < num_irq; i++) {
irq_set_chip(i, &cp_intc_irq_chip);
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
irq_set_handler(i, handle_edge_irq);
irq_base = irq_alloc_descs(-1, 0, num_irq, 0);
if (irq_base < 0) {
pr_warn("Couldn't allocate IRQ numbers\n");
irq_base = 0;
}
/* create a legacy host */
cp_intc_domain = irq_domain_add_legacy(node, num_irq,
irq_base, 0, &cp_intc_host_ops, NULL);
if (!cp_intc_domain) {
pr_err("cp_intc: failed to allocate irq host!\n");
return -EINVAL;
}
/* Enable global interrupt */
cp_intc_write(1, CP_INTC_GLOBAL_ENABLE);
return 0;
}
void __init cp_intc_init(void)
{
__cp_intc_init(NULL);
}