2 * linux/arch/arm/mach-omap1/fpga.c
4 * Interrupt handler for OMAP-1510 Innovator FPGA
6 * Copyright (C) 2001 RidgeRun, Inc.
7 * Author: Greg Lonnon <glonnon@ridgerun.com>
9 * Copyright (C) 2002 MontaVista Software, Inc.
11 * Separated FPGA interrupts from innovator1510.c and cleaned up for 2.6
12 * Copyright (C) 2004 Nokia Corporation by Tony Lindrgen <tony@atomide.com>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 #include <linux/types.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/device.h>
23 #include <linux/errno.h>
26 #include <mach/hardware.h>
28 #include <asm/mach/irq.h>
30 #include <plat/fpga.h>
31 #include <mach/gpio.h>
33 static void fpga_mask_irq(unsigned int irq
)
35 irq
-= OMAP_FPGA_IRQ_BASE
;
38 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_LO
)
39 & ~(1 << irq
)), OMAP1510_FPGA_IMR_LO
);
41 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_HI
)
42 & ~(1 << (irq
- 8))), OMAP1510_FPGA_IMR_HI
);
44 __raw_writeb((__raw_readb(INNOVATOR_FPGA_IMR2
)
45 & ~(1 << (irq
- 16))), INNOVATOR_FPGA_IMR2
);
49 static inline u32
get_fpga_unmasked_irqs(void)
52 ((__raw_readb(OMAP1510_FPGA_ISR_LO
) &
53 __raw_readb(OMAP1510_FPGA_IMR_LO
))) |
54 ((__raw_readb(OMAP1510_FPGA_ISR_HI
) &
55 __raw_readb(OMAP1510_FPGA_IMR_HI
)) << 8) |
56 ((__raw_readb(INNOVATOR_FPGA_ISR2
) &
57 __raw_readb(INNOVATOR_FPGA_IMR2
)) << 16);
61 static void fpga_ack_irq(unsigned int irq
)
63 /* Don't need to explicitly ACK FPGA interrupts */
66 static void fpga_unmask_irq(unsigned int irq
)
68 irq
-= OMAP_FPGA_IRQ_BASE
;
71 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_LO
) | (1 << irq
)),
72 OMAP1510_FPGA_IMR_LO
);
74 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_HI
)
75 | (1 << (irq
- 8))), OMAP1510_FPGA_IMR_HI
);
77 __raw_writeb((__raw_readb(INNOVATOR_FPGA_IMR2
)
78 | (1 << (irq
- 16))), INNOVATOR_FPGA_IMR2
);
81 static void fpga_mask_ack_irq(unsigned int irq
)
87 void innovator_fpga_IRQ_demux(unsigned int irq
, struct irq_desc
*desc
)
92 stat
= get_fpga_unmasked_irqs();
97 for (fpga_irq
= OMAP_FPGA_IRQ_BASE
;
98 (fpga_irq
< OMAP_FPGA_IRQ_END
) && stat
;
99 fpga_irq
++, stat
>>= 1) {
101 generic_handle_irq(fpga_irq
);
106 static struct irq_chip omap_fpga_irq_ack
= {
108 .ack
= fpga_mask_ack_irq
,
109 .mask
= fpga_mask_irq
,
110 .unmask
= fpga_unmask_irq
,
114 static struct irq_chip omap_fpga_irq
= {
117 .mask
= fpga_mask_irq
,
118 .unmask
= fpga_unmask_irq
,
121 void omap1510_fpga_init_irq(void)
125 __raw_writeb(0, OMAP1510_FPGA_IMR_LO
);
126 __raw_writeb(0, OMAP1510_FPGA_IMR_HI
);
127 __raw_writeb(0, INNOVATOR_FPGA_IMR2
);
129 for (i
= OMAP_FPGA_IRQ_BASE
; i
< OMAP_FPGA_IRQ_END
; i
++) {
131 if (i
== OMAP1510_INT_FPGA_TS
) {
133 * The touchscreen interrupt is level-sensitive, so
134 * we'll use the regular mask_ack routine for it.
136 set_irq_chip(i
, &omap_fpga_irq_ack
);
140 * All FPGA interrupts except the touchscreen are
141 * edge-sensitive, so we won't mask them.
143 set_irq_chip(i
, &omap_fpga_irq
);
146 set_irq_handler(i
, handle_edge_irq
);
147 set_irq_flags(i
, IRQF_VALID
);
151 * The FPGA interrupt line is connected to GPIO13. Claim this pin for
154 * NOTE: For general GPIO/MPUIO access and interrupts, please see
157 gpio_request(13, "FPGA irq");
158 gpio_direction_input(13);
159 set_irq_type(gpio_to_irq(13), IRQ_TYPE_EDGE_RISING
);
160 set_irq_chained_handler(OMAP1510_INT_FPGA
, innovator_fpga_IRQ_demux
);
163 EXPORT_SYMBOL(omap1510_fpga_init_irq
);