1 /* 2 * First-level interrupt controller model for Hexagon. 3 * 4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA. 19 */ 20 21 #include <linux/interrupt.h> 22 #include <asm/irq.h> 23 #include <asm/hexagon_vm.h> 24 25 static void mask_irq(struct irq_data *data) 26 { 27 __vmintop_locdis((long) data->irq); 28 } 29 30 static void mask_irq_num(unsigned int irq) 31 { 32 __vmintop_locdis((long) irq); 33 } 34 35 static void unmask_irq(struct irq_data *data) 36 { 37 __vmintop_locen((long) data->irq); 38 } 39 40 /* This is actually all we need for handle_fasteoi_irq */ 41 static void eoi_irq(struct irq_data *data) 42 { 43 __vmintop_globen((long) data->irq); 44 } 45 46 /* Power mamangement wake call. We don't need this, however, 47 * if this is absent, then an -ENXIO error is returned to the 48 * msm_serial driver, and it fails to correctly initialize. 49 * This is a bug in the msm_serial driver, but, for now, we 50 * work around it here, by providing this bogus handler. 51 * XXX FIXME!!! remove this when msm_serial is fixed. 52 */ 53 static int set_wake(struct irq_data *data, unsigned int on) 54 { 55 return 0; 56 } 57 58 static struct irq_chip hexagon_irq_chip = { 59 .name = "HEXAGON", 60 .irq_mask = mask_irq, 61 .irq_unmask = unmask_irq, 62 .irq_set_wake = set_wake, 63 .irq_eoi = eoi_irq 64 }; 65 66 /** 67 * The hexagon core comes with a first-level interrupt controller 68 * with 32 total possible interrupts. When the core is embedded 69 * into different systems/platforms, it is typically wrapped by 70 * macro cells that provide one or more second-level interrupt 71 * controllers that are cascaded into one or more of the first-level 72 * interrupts handled here. The precise wiring of these other 73 * irqs varies from platform to platform, and are set up & configured 74 * in the platform-specific files. 75 * 76 * The first-level interrupt controller is wrapped by the VM, which 77 * virtualizes the interrupt controller for us. It provides a very 78 * simple, fast & efficient API, and so the fasteoi handler is 79 * appropriate for this case. 80 */ 81 void __init init_IRQ(void) 82 { 83 int irq; 84 85 for (irq = 0; irq < HEXAGON_CPUINTS; irq++) { 86 mask_irq_num(irq); 87 irq_set_chip_and_handler(irq, &hexagon_irq_chip, 88 handle_fasteoi_irq); 89 } 90 } 91