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 19 static void disable_se7343_irq(unsigned int irq) 20 { 21 unsigned int bit = irq - SE7343_FPGA_IRQ_BASE; 22 ctrl_outw(ctrl_inw(PA_CPLD_IMSK) | 1 << bit, PA_CPLD_IMSK); 23 } 24 25 static void enable_se7343_irq(unsigned int irq) 26 { 27 unsigned int bit = irq - SE7343_FPGA_IRQ_BASE; 28 ctrl_outw(ctrl_inw(PA_CPLD_IMSK) & ~(1 << bit), PA_CPLD_IMSK); 29 } 30 31 static struct irq_chip se7343_irq_chip __read_mostly = { 32 .name = "SE7343-FPGA", 33 .mask = disable_se7343_irq, 34 .unmask = enable_se7343_irq, 35 .mask_ack = disable_se7343_irq, 36 }; 37 38 static void se7343_irq_demux(unsigned int irq, struct irq_desc *desc) 39 { 40 unsigned short intv = ctrl_inw(PA_CPLD_ST); 41 struct irq_desc *ext_desc; 42 unsigned int ext_irq = SE7343_FPGA_IRQ_BASE; 43 44 intv &= (1 << SE7343_FPGA_IRQ_NR) - 1; 45 46 while (intv) { 47 if (intv & 1) { 48 ext_desc = irq_desc + ext_irq; 49 handle_level_irq(ext_irq, ext_desc); 50 } 51 intv >>= 1; 52 ext_irq++; 53 } 54 } 55 56 /* 57 * Initialize IRQ setting 58 */ 59 void __init init_7343se_IRQ(void) 60 { 61 int i; 62 63 ctrl_outw(0, PA_CPLD_IMSK); /* disable all irqs */ 64 ctrl_outw(0x2000, 0xb03fffec); /* mrshpc irq enable */ 65 66 for (i = 0; i < SE7343_FPGA_IRQ_NR; i++) 67 set_irq_chip_and_handler_name(SE7343_FPGA_IRQ_BASE + i, 68 &se7343_irq_chip, 69 handle_level_irq, "level"); 70 71 set_irq_chained_handler(IRQ0_IRQ, se7343_irq_demux); 72 set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); 73 set_irq_chained_handler(IRQ1_IRQ, se7343_irq_demux); 74 set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); 75 set_irq_chained_handler(IRQ4_IRQ, se7343_irq_demux); 76 set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW); 77 set_irq_chained_handler(IRQ5_IRQ, se7343_irq_demux); 78 set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW); 79 } 80