1 /* 2 * linux/arch/sh/boards/se/7722/irq.c 3 * 4 * Copyright (C) 2007 Nobuhiro Iwamatsu 5 * 6 * Hitachi UL SolutionEngine 7722 Support. 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12 #include <linux/init.h> 13 #include <linux/irq.h> 14 #include <linux/interrupt.h> 15 #include <asm/irq.h> 16 #include <asm/io.h> 17 #include <mach-se/mach/se7722.h> 18 19 unsigned int se7722_fpga_irq[SE7722_FPGA_IRQ_NR] = { 0, }; 20 21 static void disable_se7722_irq(struct irq_data *data) 22 { 23 unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data); 24 __raw_writew(__raw_readw(IRQ01_MASK) | 1 << bit, IRQ01_MASK); 25 } 26 27 static void enable_se7722_irq(struct irq_data *data) 28 { 29 unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data); 30 __raw_writew(__raw_readw(IRQ01_MASK) & ~(1 << bit), IRQ01_MASK); 31 } 32 33 static struct irq_chip se7722_irq_chip __read_mostly = { 34 .name = "SE7722-FPGA", 35 .irq_mask = disable_se7722_irq, 36 .irq_unmask = enable_se7722_irq, 37 }; 38 39 static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc) 40 { 41 unsigned short intv = __raw_readw(IRQ01_STS); 42 unsigned int ext_irq = 0; 43 44 intv &= (1 << SE7722_FPGA_IRQ_NR) - 1; 45 46 for (; intv; intv >>= 1, ext_irq++) { 47 if (!(intv & 1)) 48 continue; 49 50 generic_handle_irq(se7722_fpga_irq[ext_irq]); 51 } 52 } 53 54 /* 55 * Initialize IRQ setting 56 */ 57 void __init init_se7722_IRQ(void) 58 { 59 int i, irq; 60 61 __raw_writew(0, IRQ01_MASK); /* disable all irqs */ 62 __raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */ 63 64 for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) { 65 irq = create_irq(); 66 if (irq < 0) 67 return; 68 se7722_fpga_irq[i] = irq; 69 70 set_irq_chip_and_handler_name(se7722_fpga_irq[i], 71 &se7722_irq_chip, 72 handle_level_irq, "level"); 73 74 set_irq_chip_data(se7722_fpga_irq[i], (void *)i); 75 } 76 77 set_irq_chained_handler(IRQ0_IRQ, se7722_irq_demux); 78 set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); 79 80 set_irq_chained_handler(IRQ1_IRQ, se7722_irq_demux); 81 set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); 82 } 83