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m68k/atari: EtherNAT - add interrupt chip definition for CPLD interrupts 

Add a dedicated interrupt chip definition for the EtherNAT CPLD interrupts.
SMC91C111 and ISP1160 chips have separate interrupts that can be enabled
and disabled in a CPLD register at offset 0x23 from the card base.

Note the CPLD interrupt control register is mapped on demand, whenever any
interrupt enable/disable action is requested. The EtherNAT USB driver still
needs interrupts disabled around reset and start actions.
In particular, we cannot entirely rely on the irq_startup being called
first.

The smc91x and isp116x-hcd drivers will use this feature.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Michael Schmitz 2013-04-06 13:26:43 +13:00 committed by Geert Uytterhoeven
parent 1d87a8f291
commit e6f80e87e0
1 changed files with 82 additions and 0 deletions
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82
arch/m68k/atari/ataints.c
View File

@ -49,6 +49,7 @@
#include <asm/atari_stdma.h>
#include <asm/irq.h>
#include <asm/entry.h>
#include <asm/io.h>
/*
@ -177,6 +178,80 @@ static struct irq_chip atari_mfptimer_chip = {
.irq_disable = atari_mfptimer_disable,
};
/*
* EtherNAT CPLD interrupt handling
* CPLD interrupt register is at phys. 0x80000023
* Need this mapped in at interrupt startup time
* Possibly need this mapped on demand anyway -
* EtherNAT USB driver needs to disable IRQ before
* startup!
*/
static unsigned char *enat_cpld;
static unsigned int atari_ethernat_startup(struct irq_data *data)
{
int enat_num = 140 - data->irq + 1;
m68k_irq_startup(data);
/*
* map CPLD interrupt register
*/
if (!enat_cpld)
enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
/*
* do _not_ enable the USB chip interrupt here - causes interrupt storm
* and triggers dead interrupt watchdog
* Need to reset the USB chip to a sane state in early startup before
* removing this hack
*/
if (enat_num == 1)
*enat_cpld |= 1 << enat_num;
return 0;
}
static void atari_ethernat_enable(struct irq_data *data)
{
int enat_num = 140 - data->irq + 1;
/*
* map CPLD interrupt register
*/
if (!enat_cpld)
enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
*enat_cpld |= 1 << enat_num;
}
static void atari_ethernat_disable(struct irq_data *data)
{
int enat_num = 140 - data->irq + 1;
/*
* map CPLD interrupt register
*/
if (!enat_cpld)
enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
*enat_cpld &= ~(1 << enat_num);
}
static void atari_ethernat_shutdown(struct irq_data *data)
{
int enat_num = 140 - data->irq + 1;
if (enat_cpld) {
*enat_cpld &= ~(1 << enat_num);
iounmap(enat_cpld);
enat_cpld = NULL;
}
}
static struct irq_chip atari_ethernat_chip = {
.name = "ethernat",
.irq_startup = atari_ethernat_startup,
.irq_shutdown = atari_ethernat_shutdown,
.irq_enable = atari_ethernat_enable,
.irq_disable = atari_ethernat_disable,
};
/*
* void atari_init_IRQ (void)
*
@ -268,6 +343,13 @@ void __init atari_init_IRQ(void)
if (request_irq(IRQ_MFP_TIMD, mfptimer_handler, IRQF_SHARED,
stmfp_base.name, &stmfp_base))
pr_err("Couldn't register %s interrupt\n", stmfp_base.name);
/*
* EtherNAT ethernet / USB interrupt handlers
*/
m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq,
139, 2);
}