1/* 2 * linux/arch/sh/boards/se/7343/irq.c 3 * 4 * Copyright (C) 2008 Yoshihiro Shimoda 5 * 6 * Based on linux/arch/sh/boards/se/7722/irq.c 7 * Copyright (C) 2007 Nobuhiro Iwamatsu 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file "COPYING" in the main directory of this archive 11 * for more details. 12 */ 13#include <linux/init.h> 14#include <linux/irq.h> 15#include <linux/interrupt.h> 16#include <linux/io.h> 17#include <mach-se/mach/se7343.h> 18 19unsigned int se7343_fpga_irq[SE7343_FPGA_IRQ_NR] = { 0, }; 20 21static void disable_se7343_irq(unsigned int irq) 22{ 23 unsigned int bit = (unsigned int)get_irq_chip_data(irq); 24 __raw_writew(__raw_readw(PA_CPLD_IMSK) | 1 << bit, PA_CPLD_IMSK); 25} 26 27static void enable_se7343_irq(unsigned int irq) 28{ 29 unsigned int bit = (unsigned int)get_irq_chip_data(irq); 30 __raw_writew(__raw_readw(PA_CPLD_IMSK) & ~(1 << bit), PA_CPLD_IMSK); 31} 32 33static struct irq_chip se7343_irq_chip __read_mostly = { 34 .name = "SE7343-FPGA", 35 .mask = disable_se7343_irq, 36 .unmask = enable_se7343_irq, 37 .mask_ack = disable_se7343_irq, 38}; 39 40static void se7343_irq_demux(unsigned int irq, struct irq_desc *desc) 41{ 42 unsigned short intv = __raw_readw(PA_CPLD_ST); 43 unsigned int ext_irq = 0; 44 45 intv &= (1 << SE7343_FPGA_IRQ_NR) - 1; 46 47 for (; intv; intv >>= 1, ext_irq++) { 48 if (!(intv & 1)) 49 continue; 50 51 generic_handle_irq(se7343_fpga_irq[ext_irq]); 52 } 53} 54 55/* 56 * Initialize IRQ setting 57 */ 58void __init init_7343se_IRQ(void) 59{ 60 int i, irq; 61 62 __raw_writew(0, PA_CPLD_IMSK); /* disable all irqs */ 63 __raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */ 64 65 for (i = 0; i < SE7343_FPGA_IRQ_NR; i++) { 66 irq = create_irq(); 67 if (irq < 0) 68 return; 69 se7343_fpga_irq[i] = irq; 70 71 set_irq_chip_and_handler_name(se7343_fpga_irq[i], 72 &se7343_irq_chip, 73 handle_level_irq, "level"); 74 75 set_irq_chip_data(se7343_fpga_irq[i], (void *)i); 76 } 77 78 set_irq_chained_handler(IRQ0_IRQ, se7343_irq_demux); 79 set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); 80 set_irq_chained_handler(IRQ1_IRQ, se7343_irq_demux); 81 set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); 82 set_irq_chained_handler(IRQ4_IRQ, se7343_irq_demux); 83 set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW); 84 set_irq_chained_handler(IRQ5_IRQ, se7343_irq_demux); 85 set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW); 86} 87