Blackfin: bf537: demux port H mask A and emac rx ints

The BF537 SIC combines the gpio port H mask A interrupts with the
emac rx interrupt, so we need to demux this in software.

It also combines the gpio port H mask B and the emac tx interrupts,
and the watchdog and port F mask B interrupts, but since we don't
support mask B yet, just add the defines for now.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 65 insertions, 7 deletions

diff --git a/arch/blackfin/mach-bf537/include/mach/irq.h b/arch/blackfin/mach-bf537/include/mach/irq.h
index cc313234741..b6ed8235bda 100644
--- a/arch/blackfin/mach-bf537/include/mach/irq.h
+++ b/arch/blackfin/mach-bf537/include/mach/irq.h
@@ -28,8 +28,8 @@
 #define IRQ_UART1_TX		BFIN_IRQ(14)	/* DMA11 Interrupt (UART1 TX) */
 #define IRQ_CAN_RX		BFIN_IRQ(15)	/* CAN Receive Interrupt */
 #define IRQ_CAN_TX		BFIN_IRQ(16)	/* CAN Transmit Interrupt */
-#define IRQ_MAC_RX		BFIN_IRQ(17)	/* DMA1 (Ethernet RX) Interrupt */
-#define IRQ_MAC_TX		BFIN_IRQ(18)	/* DMA2 (Ethernet TX) Interrupt */
+#define IRQ_PH_INTA_MAC_RX	BFIN_IRQ(17)	/* Port H Interrupt A & DMA1 Interrupt (Ethernet RX) */
+#define IRQ_PH_INTB_MAC_TX	BFIN_IRQ(18)	/* Port H Interrupt B & DMA2 Interrupt (Ethernet TX) */
 #define IRQ_TIMER0		BFIN_IRQ(19)	/* Timer 0 */
 #define IRQ_TIMER1		BFIN_IRQ(20)	/* Timer 1 */
 #define IRQ_TIMER2		BFIN_IRQ(21)	/* Timer 2 */
@@ -38,12 +38,11 @@
 #define IRQ_TIMER5		BFIN_IRQ(24)	/* Timer 5 */
 #define IRQ_TIMER6		BFIN_IRQ(25)	/* Timer 6 */
 #define IRQ_TIMER7		BFIN_IRQ(26)	/* Timer 7 */
-#define IRQ_PROG_INTA		BFIN_IRQ(27)	/* PF Ports F&G (PF15:0) Interrupt A */
-#define IRQ_PORTG_INTB		BFIN_IRQ(28)	/* PF Port G (PF15:0) Interrupt B */
+#define IRQ_PF_INTA_PG_INTA	BFIN_IRQ(27)	/* Ports F&G Interrupt A */
+#define IRQ_PORTG_INTB		BFIN_IRQ(28)	/* Port G Interrupt B */
 #define IRQ_MEM_DMA0		BFIN_IRQ(29)	/* (Memory DMA Stream 0) */
 #define IRQ_MEM_DMA1		BFIN_IRQ(30)	/* (Memory DMA Stream 1) */
-#define IRQ_PROG_INTB		BFIN_IRQ(31)	/* PF Ports F (PF15:0) Interrupt B */
-#define IRQ_WATCH		BFIN_IRQ(32)	/* Watch Dog Timer */
+#define IRQ_PF_INTB_WATCH	BFIN_IRQ(31)	/* Watchdog & Port F Interrupt B */
 
 #define SYS_IRQS		39
 
@@ -118,7 +117,27 @@
 #define IRQ_MAC_TXDMAERR	104	/* TX DMA Direction Error Interrupt */
 #define IRQ_MAC_STMDONE		105	/* Station Mgt. Transfer Done Interrupt */
 
-#define NR_MACH_IRQS		(IRQ_MAC_STMDONE + 1)
+#define IRQ_MAC_RX		106	/* DMA1 Interrupt (Ethernet RX) */
+#define IRQ_PORTH_INTA		107	/* Port H Interrupt A */
+
+#if 0 /* No Interrupt B support (yet) */
+#define IRQ_MAC_TX		108	/* DMA2 Interrupt (Ethernet TX) */
+#define IRQ_PORTH_INTB		109	/* Port H Interrupt B */
+#else
+#define IRQ_MAC_TX		IRQ_PH_INTB_MAC_TX
+#endif
+
+#define IRQ_PORTF_INTA		110	/* Port F Interrupt A */
+#define IRQ_PORTG_INTA		111	/* Port G Interrupt A */
+
+#if 0 /* No Interrupt B support (yet) */
+#define IRQ_WATCH		112	/* Watchdog Timer */
+#define IRQ_PORTF_INTB		113	/* Port F Interrupt B */
+#else
+#define IRQ_WATCH		IRQ_PF_INTB_WATCH
+#endif
+
+#define NR_MACH_IRQS		(113 + 1)
 
 /* IAR0 BIT FIELDS */
 #define IRQ_PLL_WAKEUP_POS	0
diff --git a/arch/blackfin/mach-bf537/ints-priority.c b/arch/blackfin/mach-bf537/ints-priority.c
index cbf19011667..2137a209a22 100644
--- a/arch/blackfin/mach-bf537/ints-priority.c
+++ b/arch/blackfin/mach-bf537/ints-priority.c
@@ -14,6 +14,7 @@
 #include <asm/bfin5xx_spi.h>
 #include <asm/bfin_sport.h>
 #include <asm/bfin_can.h>
+#include <asm/bfin_dma.h>
 #include <asm/dpmc.h>
 
 void __init program_IAR(void)
@@ -157,6 +158,40 @@ static void bf537_demux_error_irq(unsigned int int_err_irq,
 
 }
 
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+static int mac_rx_int_mask;
+
+static void bf537_mac_rx_mask_irq(struct irq_data *d)
+{
+	mac_rx_int_mask &= ~(1L << (d->irq - IRQ_MAC_RX));
+	if (!mac_rx_int_mask)
+		bfin_internal_mask_irq(IRQ_PH_INTA_MAC_RX);
+}
+
+static void bf537_mac_rx_unmask_irq(struct irq_data *d)
+{
+	bfin_internal_unmask_irq(IRQ_PH_INTA_MAC_RX);
+	mac_rx_int_mask |= 1L << (d->irq - IRQ_MAC_RX);
+}
+
+static struct irq_chip bf537_mac_rx_irqchip = {
+	.name = "ERROR",
+	.irq_ack = bfin_ack_noop,
+	.irq_mask_ack = bf537_mac_rx_mask_irq,
+	.irq_mask = bf537_mac_rx_mask_irq,
+	.irq_unmask = bf537_mac_rx_unmask_irq,
+};
+
+static void bf537_demux_mac_rx_irq(unsigned int int_irq,
+				   struct irq_desc *desc)
+{
+	if (bfin_read_DMA1_IRQ_STATUS() & (DMA_DONE | DMA_ERR))
+		bfin_handle_irq(IRQ_MAC_RX);
+	else
+		bfin_demux_gpio_irq(int_irq, desc);
+}
+#endif
+
 void __init init_mach_irq(void)
 {
 	int irq;
@@ -172,6 +207,10 @@ void __init init_mach_irq(void)
 					 handle_level_irq);
 
 #if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+	irq_set_chained_handler(IRQ_PH_INTA_MAC_RX, bf537_demux_mac_rx_irq);
+	irq_set_chip_and_handler(IRQ_MAC_RX, &bf537_mac_rx_irqchip, handle_level_irq);
+	irq_set_chip_and_handler(IRQ_PORTH_INTA, &bf537_mac_rx_irqchip, handle_level_irq);
+
 	irq_set_chained_handler(IRQ_MAC_ERROR, bfin_demux_mac_status_irq);
 #endif
 }