1 /* 2 * Copyright (C) 2006,2007 Felix Fietkau <nbd@openwrt.org> 3 * Copyright (C) 2006,2007 Eugene Konev <ejka@openwrt.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 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 St, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 #include <linux/interrupt.h> 21 #include <linux/io.h> 22 #include <linux/irq.h> 23 24 #include <asm/irq_cpu.h> 25 #include <asm/mipsregs.h> 26 #include <asm/mach-ar7/ar7.h> 27 28 #define EXCEPT_OFFSET 0x80 29 #define PACE_OFFSET 0xA0 30 #define CHNLS_OFFSET 0x200 31 32 #define REG_OFFSET(irq, reg) ((irq) / 32 * 0x4 + reg * 0x10) 33 #define SEC_REG_OFFSET(reg) (EXCEPT_OFFSET + reg * 0x8) 34 #define SEC_SR_OFFSET (SEC_REG_OFFSET(0)) /* 0x80 */ 35 #define CR_OFFSET(irq) (REG_OFFSET(irq, 1)) /* 0x10 */ 36 #define SEC_CR_OFFSET (SEC_REG_OFFSET(1)) /* 0x88 */ 37 #define ESR_OFFSET(irq) (REG_OFFSET(irq, 2)) /* 0x20 */ 38 #define SEC_ESR_OFFSET (SEC_REG_OFFSET(2)) /* 0x90 */ 39 #define ECR_OFFSET(irq) (REG_OFFSET(irq, 3)) /* 0x30 */ 40 #define SEC_ECR_OFFSET (SEC_REG_OFFSET(3)) /* 0x98 */ 41 #define PIR_OFFSET (0x40) 42 #define MSR_OFFSET (0x44) 43 #define PM_OFFSET(irq) (REG_OFFSET(irq, 5)) /* 0x50 */ 44 #define TM_OFFSET(irq) (REG_OFFSET(irq, 6)) /* 0x60 */ 45 46 #define REG(addr) ((u32 *)(KSEG1ADDR(AR7_REGS_IRQ) + addr)) 47 48 #define CHNL_OFFSET(chnl) (CHNLS_OFFSET + (chnl * 4)) 49 50 static int ar7_irq_base; 51 52 static void ar7_unmask_irq(unsigned int irq) 53 { 54 writel(1 << ((irq - ar7_irq_base) % 32), 55 REG(ESR_OFFSET(irq - ar7_irq_base))); 56 } 57 58 static void ar7_mask_irq(unsigned int irq) 59 { 60 writel(1 << ((irq - ar7_irq_base) % 32), 61 REG(ECR_OFFSET(irq - ar7_irq_base))); 62 } 63 64 static void ar7_ack_irq(unsigned int irq) 65 { 66 writel(1 << ((irq - ar7_irq_base) % 32), 67 REG(CR_OFFSET(irq - ar7_irq_base))); 68 } 69 70 static void ar7_unmask_sec_irq(unsigned int irq) 71 { 72 writel(1 << (irq - ar7_irq_base - 40), REG(SEC_ESR_OFFSET)); 73 } 74 75 static void ar7_mask_sec_irq(unsigned int irq) 76 { 77 writel(1 << (irq - ar7_irq_base - 40), REG(SEC_ECR_OFFSET)); 78 } 79 80 static void ar7_ack_sec_irq(unsigned int irq) 81 { 82 writel(1 << (irq - ar7_irq_base - 40), REG(SEC_CR_OFFSET)); 83 } 84 85 static struct irq_chip ar7_irq_type = { 86 .name = "AR7", 87 .unmask = ar7_unmask_irq, 88 .mask = ar7_mask_irq, 89 .ack = ar7_ack_irq 90 }; 91 92 static struct irq_chip ar7_sec_irq_type = { 93 .name = "AR7", 94 .unmask = ar7_unmask_sec_irq, 95 .mask = ar7_mask_sec_irq, 96 .ack = ar7_ack_sec_irq, 97 }; 98 99 static struct irqaction ar7_cascade_action = { 100 .handler = no_action, 101 .name = "AR7 cascade interrupt" 102 }; 103 104 static void __init ar7_irq_init(int base) 105 { 106 int i; 107 /* 108 * Disable interrupts and clear pending 109 */ 110 writel(0xffffffff, REG(ECR_OFFSET(0))); 111 writel(0xff, REG(ECR_OFFSET(32))); 112 writel(0xffffffff, REG(SEC_ECR_OFFSET)); 113 writel(0xffffffff, REG(CR_OFFSET(0))); 114 writel(0xff, REG(CR_OFFSET(32))); 115 writel(0xffffffff, REG(SEC_CR_OFFSET)); 116 117 ar7_irq_base = base; 118 119 for (i = 0; i < 40; i++) { 120 writel(i, REG(CHNL_OFFSET(i))); 121 /* Primary IRQ's */ 122 set_irq_chip_and_handler(base + i, &ar7_irq_type, 123 handle_level_irq); 124 /* Secondary IRQ's */ 125 if (i < 32) 126 set_irq_chip_and_handler(base + i + 40, 127 &ar7_sec_irq_type, 128 handle_level_irq); 129 } 130 131 setup_irq(2, &ar7_cascade_action); 132 setup_irq(ar7_irq_base, &ar7_cascade_action); 133 set_c0_status(IE_IRQ0); 134 } 135 136 void __init arch_init_irq(void) 137 { 138 mips_cpu_irq_init(); 139 ar7_irq_init(8); 140 } 141 142 static void ar7_cascade(void) 143 { 144 u32 status; 145 int i, irq; 146 147 /* Primary IRQ's */ 148 irq = readl(REG(PIR_OFFSET)) & 0x3f; 149 if (irq) { 150 do_IRQ(ar7_irq_base + irq); 151 return; 152 } 153 154 /* Secondary IRQ's are cascaded through primary '0' */ 155 writel(1, REG(CR_OFFSET(irq))); 156 status = readl(REG(SEC_SR_OFFSET)); 157 for (i = 0; i < 32; i++) { 158 if (status & 1) { 159 do_IRQ(ar7_irq_base + i + 40); 160 return; 161 } 162 status >>= 1; 163 } 164 165 spurious_interrupt(); 166 } 167 168 asmlinkage void plat_irq_dispatch(void) 169 { 170 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; 171 if (pending & STATUSF_IP7) /* cpu timer */ 172 do_IRQ(7); 173 else if (pending & STATUSF_IP2) /* int0 hardware line */ 174 ar7_cascade(); 175 else 176 spurious_interrupt(); 177 } 178