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 unsigned int se7343_fpga_irq[SE7343_FPGA_IRQ_NR] = { 0, }; 20 21 static void disable_se7343_irq(struct irq_data *data) 22 { 23 unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data); 24 __raw_writew(__raw_readw(PA_CPLD_IMSK) | 1 << bit, PA_CPLD_IMSK); 25 } 26 27 static void enable_se7343_irq(struct irq_data *data) 28 { 29 unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data); 30 __raw_writew(__raw_readw(PA_CPLD_IMSK) & ~(1 << bit), PA_CPLD_IMSK); 31 } 32 33 static struct irq_chip se7343_irq_chip __read_mostly = { 34 .name = "SE7343-FPGA", 35 .irq_mask = disable_se7343_irq, 36 .irq_unmask = enable_se7343_irq, 37 }; 38 39 static void se7343_irq_demux(unsigned int irq, struct irq_desc *desc) 40 { 41 unsigned short intv = __raw_readw(PA_CPLD_ST); 42 unsigned int ext_irq = 0; 43 44 intv &= (1 << SE7343_FPGA_IRQ_NR) - 1; 45 46 for (; intv; intv >>= 1, ext_irq++) { 47 if (!(intv & 1)) 48 continue; 49 50 generic_handle_irq(se7343_fpga_irq[ext_irq]); 51 } 52 } 53 54 /* 55 * Initialize IRQ setting 56 */ 57 void __init init_7343se_IRQ(void) 58 { 59 int i, irq; 60 61 __raw_writew(0, PA_CPLD_IMSK); /* disable all irqs */ 62 __raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */ 63 64 for (i = 0; i < SE7343_FPGA_IRQ_NR; i++) { 65 irq = create_irq(); 66 if (irq < 0) 67 return; 68 se7343_fpga_irq[i] = irq; 69 70 irq_set_chip_and_handler_name(se7343_fpga_irq[i], 71 &se7343_irq_chip, 72 handle_level_irq, 73 "level"); 74 75 irq_set_chip_data(se7343_fpga_irq[i], (void *)i); 76 } 77 78 irq_set_chained_handler(IRQ0_IRQ, se7343_irq_demux); 79 irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); 80 irq_set_chained_handler(IRQ1_IRQ, se7343_irq_demux); 81 irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); 82 irq_set_chained_handler(IRQ4_IRQ, se7343_irq_demux); 83 irq_set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW); 84 irq_set_chained_handler(IRQ5_IRQ, se7343_irq_demux); 85 irq_set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW); 86 } 87