[PATCH 08/11] m68k/atari: EtherNAT - add interrupt chip definition for CPLD interrupts

Michael Schmitz
2013-03-25T06:38:16Z

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.

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

Signed-off-by: Michael Schmitz <schmitz@debian.org>
---
arch/m68k/atari/ataints.c | 68 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 68 insertions(+), 0 deletions(-)

diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
index 2cf7349..525e641 100644
--- a/arch/m68k/atari/ataints.c
+++ b/arch/m68k/atari/ataints.c
@@ -49,6 +49,7 @@
#include <asm/atari_stdma.h>
#include <asm/irq.h>
#include <asm/entry.h>
+#include <asm/io.h>

/*
@@ -177,6 +178,66 @@ 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
+ */
+
+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;
+ *enat_cpld |= 1 << enat_num;
+}
+
+static void atari_ethernat_disable(struct irq_data *data)
+{
+ int enat_num = 140 - data->irq + 1;
+ *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 +329,13 @@ 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);
}

--
1.7.0.4