| 1 | /* |
| 2 | * Gary Jennejohn (C) 2003 <gj@denx.de> |
| 3 | * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> |
| 4 | * Copyright (C) 2007 John Crispin <blogic@openwrt.org> |
| 5 | * |
| 6 | * This program is free software; you can distribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License (Version 2) as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 18 | * |
| 19 | * Routines for generic manipulation of the interrupts found on the |
| 20 | * AMAZON boards. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/kernel_stat.h> |
| 28 | #include <linux/module.h> |
| 29 | |
| 30 | #include <asm/amazon/amazon.h> |
| 31 | #include <asm/amazon/irq.h> |
| 32 | #include <asm/bootinfo.h> |
| 33 | #include <asm/irq_cpu.h> |
| 34 | #include <asm/irq.h> |
| 35 | #include <asm/time.h> |
| 36 | |
| 37 | static void amazon_disable_irq(unsigned int irq_nr) |
| 38 | { |
| 39 | int i; |
| 40 | u32 amazon_ier = AMAZON_ICU_IM0_IER; |
| 41 | |
| 42 | if (irq_nr <= INT_NUM_IM0_IRL11 && irq_nr >= INT_NUM_IM0_IRL0) |
| 43 | amazon_writel(amazon_readl(amazon_ier) & (~(AMAZON_DMA_H_MASK)), amazon_ier); |
| 44 | else { |
| 45 | irq_nr -= INT_NUM_IRQ0; |
| 46 | for (i = 0; i <= 4; i++) |
| 47 | { |
| 48 | if (irq_nr <= 31) |
| 49 | amazon_writel(amazon_readl(amazon_ier) & ~(1 << irq_nr ), amazon_ier); |
| 50 | amazon_ier += 0x10; |
| 51 | irq_nr -= 32; |
| 52 | } |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | static void amazon_mask_and_ack_irq(unsigned int irq_nr) |
| 57 | { |
| 58 | int i; |
| 59 | u32 amazon_ier = AMAZON_ICU_IM0_IER; |
| 60 | u32 amazon_isr = AMAZON_ICU_IM0_ISR; |
| 61 | |
| 62 | if (irq_nr <= INT_NUM_IM0_IRL11 && irq_nr >= INT_NUM_IM0_IRL0){ |
| 63 | amazon_writel(amazon_readl(amazon_ier) & (~(AMAZON_DMA_H_MASK)), amazon_ier); |
| 64 | amazon_writel(AMAZON_DMA_H_MASK, amazon_isr); |
| 65 | } else { |
| 66 | irq_nr -= INT_NUM_IRQ0; |
| 67 | for (i = 0; i <= 4; i++) |
| 68 | { |
| 69 | if (irq_nr <= 31){ |
| 70 | amazon_writel(amazon_readl(amazon_ier) & ~(1 << irq_nr ), amazon_ier); |
| 71 | amazon_writel((1 << irq_nr ), amazon_isr); |
| 72 | } |
| 73 | amazon_ier += 0x10; |
| 74 | amazon_isr += 0x10; |
| 75 | irq_nr -= 32; |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | static void amazon_enable_irq(unsigned int irq_nr) |
| 81 | { |
| 82 | int i; |
| 83 | u32 amazon_ier = AMAZON_ICU_IM0_IER; |
| 84 | |
| 85 | if (irq_nr <= INT_NUM_IM0_IRL11 && irq_nr >= INT_NUM_IM0_IRL0) |
| 86 | amazon_writel(amazon_readl(amazon_ier) | AMAZON_DMA_H_MASK, amazon_ier); |
| 87 | else { |
| 88 | irq_nr -= INT_NUM_IRQ0; |
| 89 | for (i = 0; i <= 4; i++) |
| 90 | { |
| 91 | if (irq_nr <= 31) |
| 92 | amazon_writel(amazon_readl(amazon_ier) | (1 << irq_nr ), amazon_ier); |
| 93 | amazon_ier += 0x10; |
| 94 | irq_nr -= 32; |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static unsigned int amazon_startup_irq(unsigned int irq) |
| 100 | { |
| 101 | amazon_enable_irq(irq); |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static void amazon_end_irq(unsigned int irq) |
| 106 | { |
| 107 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) { |
| 108 | amazon_enable_irq(irq); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static struct irq_chip amazon_irq_type = { |
| 113 | .name = "AMAZON", |
| 114 | .startup = amazon_startup_irq, |
| 115 | .enable = amazon_enable_irq, |
| 116 | .disable = amazon_disable_irq, |
| 117 | .unmask = amazon_enable_irq, |
| 118 | .ack = amazon_mask_and_ack_irq, |
| 119 | .mask = amazon_disable_irq, |
| 120 | .mask_ack = amazon_mask_and_ack_irq, |
| 121 | .end = amazon_end_irq |
| 122 | }; |
| 123 | |
| 124 | /* Cascaded interrupts from IM0-4 */ |
| 125 | static inline void amazon_hw_irqdispatch(u8 line) |
| 126 | { |
| 127 | u32 irq; |
| 128 | |
| 129 | irq = (amazon_readl(AMAZON_ICU_IM_VEC) >> (line * 5)) & AMAZON_ICU_IM0_VEC_MASK; |
| 130 | if (line == 0 && irq <= 11 && irq >= 0) { |
| 131 | //DMA fixed to IM0_IRL0 |
| 132 | irq = 0; |
| 133 | } |
| 134 | do_IRQ(irq + INT_NUM_IRQ0 + (line * 32)); |
| 135 | } |
| 136 | |
| 137 | asmlinkage void plat_irq_dispatch(void) |
| 138 | { |
| 139 | unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; |
| 140 | if (pending & CAUSEF_IP7){ |
| 141 | do_IRQ(MIPS_CPU_TIMER_IRQ); |
| 142 | goto out; |
| 143 | } else { |
| 144 | unsigned int i; |
| 145 | for (i = 0; i <= 4; i++) |
| 146 | { |
| 147 | if(pending & (CAUSEF_IP2 << i)){ |
| 148 | amazon_hw_irqdispatch(i); |
| 149 | goto out; |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | printk("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status()); |
| 154 | out: |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | static struct irqaction cascade = { |
| 159 | .handler = no_action, |
| 160 | .flags = IRQF_DISABLED, |
| 161 | .name = "cascade", |
| 162 | }; |
| 163 | |
| 164 | void __init arch_init_irq(void) |
| 165 | { |
| 166 | int i; |
| 167 | |
| 168 | /* mask all interrupt sources */ |
| 169 | for(i = 0; i <= 4; i++){ |
| 170 | amazon_writel(0, AMAZON_ICU_IM0_IER + (i * 0x10)); |
| 171 | } |
| 172 | |
| 173 | mips_cpu_irq_init(); |
| 174 | |
| 175 | /* set up irq cascade */ |
| 176 | for (i = 2; i <= 6; i++) { |
| 177 | setup_irq(i, &cascade); |
| 178 | } |
| 179 | |
| 180 | for (i = INT_NUM_IRQ0; i <= INT_NUM_IM4_IRL31; i++) |
| 181 | set_irq_chip_and_handler(i, &amazon_irq_type, |
| 182 | handle_level_irq); |
| 183 | |
| 184 | set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); |
| 185 | } |
| 186 | |
| 187 | void __cpuinit arch_fixup_c0_irqs(void) |
| 188 | { |
| 189 | /* FIXME: check for CPUID and only do fix for specific chips/versions */ |
| 190 | cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ; |
| 191 | cp0_perfcount_irq = CP0_LEGACY_PERFCNT_IRQ; |
| 192 | } |
| 193 | |
