| 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | * You should have received a copy of the GNU General Public License |
| 13 | * along with this program; if not, write to the Free Software |
| 14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 15 | * |
| 16 | * Copyright (C) 2005 Wu Qi Ming infineon |
| 17 | * Copyright (C) 2007 John Crispin <blogic@openwrt.org> |
| 18 | */ |
| 19 | |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/kernel_stat.h> |
| 25 | #include <linux/module.h> |
| 26 | |
| 27 | #include <asm/bootinfo.h> |
| 28 | #include <asm/irq.h> |
| 29 | #include <asm/irq_cpu.h> |
| 30 | |
| 31 | #include <ifxmips.h> |
| 32 | #include <ifxmips_irq.h> |
| 33 | |
| 34 | void ifxmips_disable_irq(unsigned int irq_nr) |
| 35 | { |
| 36 | int i; |
| 37 | u32 *ifxmips_ier = IFXMIPS_ICU_IM0_IER; |
| 38 | |
| 39 | irq_nr -= INT_NUM_IRQ0; |
| 40 | for (i = 0; i <= 4; i++) { |
| 41 | if (irq_nr < INT_NUM_IM_OFFSET) { |
| 42 | ifxmips_w32(ifxmips_r32(ifxmips_ier) & ~(1 << irq_nr), |
| 43 | ifxmips_ier); |
| 44 | return; |
| 45 | } |
| 46 | ifxmips_ier += IFXMIPS_ICU_OFFSET; |
| 47 | irq_nr -= INT_NUM_IM_OFFSET; |
| 48 | } |
| 49 | } |
| 50 | EXPORT_SYMBOL(ifxmips_disable_irq); |
| 51 | |
| 52 | void ifxmips_mask_and_ack_irq(unsigned int irq_nr) |
| 53 | { |
| 54 | int i; |
| 55 | u32 *ifxmips_ier = IFXMIPS_ICU_IM0_IER; |
| 56 | u32 *ifxmips_isr = IFXMIPS_ICU_IM0_ISR; |
| 57 | |
| 58 | irq_nr -= INT_NUM_IRQ0; |
| 59 | for (i = 0; i <= 4; i++) { |
| 60 | if (irq_nr < INT_NUM_IM_OFFSET) { |
| 61 | ifxmips_w32(ifxmips_r32(ifxmips_ier) & ~(1 << irq_nr), |
| 62 | ifxmips_ier); |
| 63 | ifxmips_w32((1 << irq_nr), ifxmips_isr); |
| 64 | return; |
| 65 | } |
| 66 | ifxmips_ier += IFXMIPS_ICU_OFFSET; |
| 67 | ifxmips_isr += IFXMIPS_ICU_OFFSET; |
| 68 | irq_nr -= INT_NUM_IM_OFFSET; |
| 69 | } |
| 70 | } |
| 71 | EXPORT_SYMBOL(ifxmips_mask_and_ack_irq); |
| 72 | |
| 73 | void ifxmips_enable_irq(unsigned int irq_nr) |
| 74 | { |
| 75 | int i; |
| 76 | u32 *ifxmips_ier = IFXMIPS_ICU_IM0_IER; |
| 77 | |
| 78 | irq_nr -= INT_NUM_IRQ0; |
| 79 | for (i = 0; i <= 4; i++) { |
| 80 | if (irq_nr < INT_NUM_IM_OFFSET) { |
| 81 | ifxmips_w32(ifxmips_r32(ifxmips_ier) | (1 << irq_nr), |
| 82 | ifxmips_ier); |
| 83 | return; |
| 84 | } |
| 85 | ifxmips_ier += IFXMIPS_ICU_OFFSET; |
| 86 | irq_nr -= INT_NUM_IM_OFFSET; |
| 87 | } |
| 88 | } |
| 89 | EXPORT_SYMBOL(ifxmips_enable_irq); |
| 90 | |
| 91 | static unsigned int ifxmips_startup_irq(unsigned int irq) |
| 92 | { |
| 93 | ifxmips_enable_irq(irq); |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static void ifxmips_end_irq(unsigned int irq) |
| 98 | { |
| 99 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) |
| 100 | ifxmips_enable_irq(irq); |
| 101 | } |
| 102 | |
| 103 | static struct hw_interrupt_type ifxmips_irq_type = { |
| 104 | "IFXMIPS", |
| 105 | .startup = ifxmips_startup_irq, |
| 106 | .enable = ifxmips_enable_irq, |
| 107 | .disable = ifxmips_disable_irq, |
| 108 | .unmask = ifxmips_enable_irq, |
| 109 | .ack = ifxmips_end_irq, |
| 110 | .mask = ifxmips_disable_irq, |
| 111 | .mask_ack = ifxmips_mask_and_ack_irq, |
| 112 | .end = ifxmips_end_irq, |
| 113 | }; |
| 114 | |
| 115 | /* silicon bug causes only the msb set to 1 to be valid. all |
| 116 | other bits might be bogus */ |
| 117 | static inline int ls1bit32(unsigned long x) |
| 118 | { |
| 119 | __asm__ ( |
| 120 | ".set push \n" |
| 121 | ".set mips32 \n" |
| 122 | "clz %0, %1 \n" |
| 123 | ".set pop \n" |
| 124 | : "=r" (x) |
| 125 | : "r" (x)); |
| 126 | return 31 - x; |
| 127 | } |
| 128 | |
| 129 | void ifxmips_hw_irqdispatch(int module) |
| 130 | { |
| 131 | u32 irq; |
| 132 | |
| 133 | irq = ifxmips_r32(IFXMIPS_ICU_IM0_IOSR + (module * IFXMIPS_ICU_OFFSET)); |
| 134 | if (irq == 0) |
| 135 | return; |
| 136 | |
| 137 | /* we need to do this due to a silicon bug */ |
| 138 | irq = ls1bit32(irq); |
| 139 | do_IRQ((int)irq + INT_NUM_IM0_IRL0 + (INT_NUM_IM_OFFSET * module)); |
| 140 | |
| 141 | if ((irq == 22) && (module == 0)) |
| 142 | ifxmips_w32(ifxmips_r32(IFXMIPS_EBU_PCC_ISTAT) | 0x10, |
| 143 | IFXMIPS_EBU_PCC_ISTAT); |
| 144 | } |
| 145 | |
| 146 | #ifdef CONFIG_CPU_MIPSR2_IRQ_VI |
| 147 | #define DEFINE_HWx_IRQDISPATCH(x) \ |
| 148 | static void ifxmips_hw ## x ## _irqdispatch(void)\ |
| 149 | {\ |
| 150 | ifxmips_hw_irqdispatch(x); \ |
| 151 | } |
| 152 | static void ifxmips_hw5_irqdispatch(void) |
| 153 | { |
| 154 | do_IRQ(MIPS_CPU_TIMER_IRQ); |
| 155 | } |
| 156 | DEFINE_HWx_IRQDISPATCH(0) |
| 157 | DEFINE_HWx_IRQDISPATCH(1) |
| 158 | DEFINE_HWx_IRQDISPATCH(2) |
| 159 | DEFINE_HWx_IRQDISPATCH(3) |
| 160 | DEFINE_HWx_IRQDISPATCH(4) |
| 161 | /*DEFINE_HWx_IRQDISPATCH(5)*/ |
| 162 | #endif /* #ifdef CONFIG_CPU_MIPSR2_IRQ_VI */ |
| 163 | |
| 164 | asmlinkage void plat_irq_dispatch(void) |
| 165 | { |
| 166 | unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; |
| 167 | unsigned int i; |
| 168 | |
| 169 | if (pending & CAUSEF_IP7) { |
| 170 | do_IRQ(MIPS_CPU_TIMER_IRQ); |
| 171 | goto out; |
| 172 | } else { |
| 173 | for (i = 0; i < 5; i++) { |
| 174 | if (pending & (CAUSEF_IP2 << i)) { |
| 175 | ifxmips_hw_irqdispatch(i); |
| 176 | goto out; |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | printk(KERN_ALERT "Spurious IRQ: CAUSE=0x%08x\n", read_c0_status()); |
| 181 | |
| 182 | out: |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | static struct irqaction cascade = { |
| 187 | .handler = no_action, |
| 188 | .flags = IRQF_DISABLED, |
| 189 | .name = "cascade", |
| 190 | }; |
| 191 | |
| 192 | void __init arch_init_irq(void) |
| 193 | { |
| 194 | int i; |
| 195 | |
| 196 | for (i = 0; i < 5; i++) |
| 197 | ifxmips_w32(0, IFXMIPS_ICU_IM0_IER + (i * IFXMIPS_ICU_OFFSET)); |
| 198 | |
| 199 | mips_cpu_irq_init(); |
| 200 | |
| 201 | for (i = 2; i <= 6; i++) |
| 202 | setup_irq(i, &cascade); |
| 203 | |
| 204 | #ifdef CONFIG_CPU_MIPSR2_IRQ_VI |
| 205 | if (cpu_has_vint) { |
| 206 | printk(KERN_INFO "Setting up vectored interrupts\n"); |
| 207 | set_vi_handler(2, ifxmips_hw0_irqdispatch); |
| 208 | set_vi_handler(3, ifxmips_hw1_irqdispatch); |
| 209 | set_vi_handler(4, ifxmips_hw2_irqdispatch); |
| 210 | set_vi_handler(5, ifxmips_hw3_irqdispatch); |
| 211 | set_vi_handler(6, ifxmips_hw4_irqdispatch); |
| 212 | set_vi_handler(7, ifxmips_hw5_irqdispatch); |
| 213 | } |
| 214 | #endif /* CONFIG_CPU_MIPSR2_IRQ_VI */ |
| 215 | |
| 216 | for (i = INT_NUM_IRQ0; i <= (INT_NUM_IRQ0 + (5 * INT_NUM_IM_OFFSET)); |
| 217 | i++) |
| 218 | set_irq_chip_and_handler(i, &ifxmips_irq_type, |
| 219 | handle_level_irq); |
| 220 | |
| 221 | #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) |
| 222 | set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | |
| 223 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); |
| 224 | #else |
| 225 | set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 | |
| 226 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); |
| 227 | #endif |
| 228 | } |
| 229 | |
| 230 | void __cpuinit arch_fixup_c0_irqs(void) |
| 231 | { |
| 232 | /* FIXME: check for CPUID and only do fix for specific chips/versions */ |
| 233 | cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ; |
| 234 | cp0_perfcount_irq = CP0_LEGACY_PERFCNT_IRQ; |
| 235 | } |
| 236 | |
