1/* 2 * linux/arch/arm/mach-omap1/fpga.c 3 * 4 * Interrupt handler for OMAP-1510 Innovator FPGA 5 * 6 * Copyright (C) 2001 RidgeRun, Inc. 7 * Author: Greg Lonnon <glonnon@ridgerun.com> 8 * 9 * Copyright (C) 2002 MontaVista Software, Inc. 10 * 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> 13 * 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. 17 */ 18 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> 24#include <linux/io.h> 25 26#include <mach/hardware.h> 27#include <asm/irq.h> 28#include <asm/mach/irq.h> 29 30#include <plat/fpga.h> 31#include <mach/gpio.h> 32 33static void fpga_mask_irq(unsigned int irq) 34{ 35 irq -= OMAP_FPGA_IRQ_BASE; 36 37 if (irq < 8) 38 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_LO) 39 & ~(1 << irq)), OMAP1510_FPGA_IMR_LO); 40 else if (irq < 16) 41 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_HI) 42 & ~(1 << (irq - 8))), OMAP1510_FPGA_IMR_HI); 43 else 44 __raw_writeb((__raw_readb(INNOVATOR_FPGA_IMR2) 45 & ~(1 << (irq - 16))), INNOVATOR_FPGA_IMR2); 46} 47 48 49static inline u32 get_fpga_unmasked_irqs(void) 50{ 51 return 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); 58} 59 60 61static void fpga_ack_irq(unsigned int irq) 62{ 63 /* Don't need to explicitly ACK FPGA interrupts */ 64} 65 66static void fpga_unmask_irq(unsigned int irq) 67{ 68 irq -= OMAP_FPGA_IRQ_BASE; 69 70 if (irq < 8) 71 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_LO) | (1 << irq)), 72 OMAP1510_FPGA_IMR_LO); 73 else if (irq < 16) 74 __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_HI) 75 | (1 << (irq - 8))), OMAP1510_FPGA_IMR_HI); 76 else 77 __raw_writeb((__raw_readb(INNOVATOR_FPGA_IMR2) 78 | (1 << (irq - 16))), INNOVATOR_FPGA_IMR2); 79} 80 81static void fpga_mask_ack_irq(unsigned int irq) 82{ 83 fpga_mask_irq(irq); 84 fpga_ack_irq(irq); 85} 86 87void innovator_fpga_IRQ_demux(unsigned int irq, struct irq_desc *desc) 88{ 89 u32 stat; 90 int fpga_irq; 91 92 stat = get_fpga_unmasked_irqs(); 93 94 if (!stat) 95 return; 96 97 for (fpga_irq = OMAP_FPGA_IRQ_BASE; 98 (fpga_irq < OMAP_FPGA_IRQ_END) && stat; 99 fpga_irq++, stat >>= 1) { 100 if (stat & 1) { 101 generic_handle_irq(fpga_irq); 102 } 103 } 104} 105 106static struct irq_chip omap_fpga_irq_ack = { 107 .name = "FPGA-ack", 108 .ack = fpga_mask_ack_irq, 109 .mask = fpga_mask_irq, 110 .unmask = fpga_unmask_irq, 111}; 112 113 114static struct irq_chip omap_fpga_irq = { 115 .name = "FPGA", 116 .ack = fpga_ack_irq, 117 .mask = fpga_mask_irq, 118 .unmask = fpga_unmask_irq, 119}; 120 121void omap1510_fpga_init_irq(void) 122{ 123 int i; 124 125 __raw_writeb(0, OMAP1510_FPGA_IMR_LO); 126 __raw_writeb(0, OMAP1510_FPGA_IMR_HI); 127 __raw_writeb(0, INNOVATOR_FPGA_IMR2); 128 129 for (i = OMAP_FPGA_IRQ_BASE; i < OMAP_FPGA_IRQ_END; i++) { 130 131 if (i == OMAP1510_INT_FPGA_TS) { 132 /* 133 * The touchscreen interrupt is level-sensitive, so 134 * we'll use the regular mask_ack routine for it. 135 */ 136 set_irq_chip(i, &omap_fpga_irq_ack); 137 } 138 else { 139 /* 140 * All FPGA interrupts except the touchscreen are 141 * edge-sensitive, so we won't mask them. 142 */ 143 set_irq_chip(i, &omap_fpga_irq); 144 } 145 146 set_irq_handler(i, handle_edge_irq); 147 set_irq_flags(i, IRQF_VALID); 148 } 149 150 /* 151 * The FPGA interrupt line is connected to GPIO13. Claim this pin for 152 * the ARM. 153 * 154 * NOTE: For general GPIO/MPUIO access and interrupts, please see 155 * gpio.[ch] 156 */ 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); 161} 162 163EXPORT_SYMBOL(omap1510_fpga_init_irq); 164