3  * arch/sh/boards/dreamcast/irq.c
5  * Holly IRQ support for the Sega Dreamcast.
11 #include <linux/irq.h>
21  * hardware events from system peripherals and triggering an SH7750 IRQ.
31  * corresponds to an IRQ, so 0xa05f6910 - 0xa05f6918 triggers IRQ 13,
32  * 0xa05f6920 - 0xa05f6928 triggers IRQ 11, and 0xa05f6930 - 0xa05f6938
33  * triggers IRQ 9.
39  * 6900/6910 - Events  0-31, IRQ 13
40  * 6904/6924 - Events 32-63, IRQ 11
41  * 6908/6938 - Events 64-95, IRQ  9
58  * For each of these *_irq routines, the IRQ passed in is the virtual IRQ
65 	unsigned int irq = data->irq;  in disable_systemasic_irq()  local
66 	__u32 emr = EMR_BASE + (LEVEL(irq) << 4) + (LEVEL(irq) << 2);  in disable_systemasic_irq()
70 	mask &= ~(1 << EVENT_BIT(irq));  in disable_systemasic_irq()
77 	unsigned int irq = data->irq;  in enable_systemasic_irq()  local
78 	__u32 emr = EMR_BASE + (LEVEL(irq) << 4) + (LEVEL(irq) << 2);  in enable_systemasic_irq()
82 	mask |= (1 << EVENT_BIT(irq));  in enable_systemasic_irq()
89 	unsigned int irq = data->irq;  in mask_ack_systemasic_irq()  local
90 	__u32 esr = ESR_BASE + (LEVEL(irq) << 2);  in mask_ack_systemasic_irq()
92 	outl((1 << EVENT_BIT(irq)), esr);  in mask_ack_systemasic_irq()
103  * Map the hardware event indicated by the processor IRQ to a virtual IRQ.
105 int systemasic_irq_demux(int irq)  in systemasic_irq_demux()  argument
110 	switch (irq) {  in systemasic_irq_demux()
121 		return irq;  in systemasic_irq_demux()
133 			irq = HW_EVENT_IRQ_BASE + j + (level << 5);  in systemasic_irq_demux()
134 			return irq;  in systemasic_irq_demux()
139 	return irq;  in systemasic_irq_demux()