John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify it |
| 3 | * under the terms of the GNU General Public License version 2 as published |
| 4 | * by the Free Software Foundation. |
| 5 | * |
| 6 | * Copyright (C) 2010 John Crispin <blogic@openwrt.org> |
| 7 | * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/ioport.h> |
| 12 | |
| 13 | #include <asm/bootinfo.h> |
| 14 | #include <asm/irq_cpu.h> |
| 15 | |
| 16 | #include <lantiq_soc.h> |
| 17 | #include <irq.h> |
| 18 | |
| 19 | /* register definitions */ |
| 20 | #define LTQ_ICU_IM0_ISR 0x0000 |
| 21 | #define LTQ_ICU_IM0_IER 0x0008 |
| 22 | #define LTQ_ICU_IM0_IOSR 0x0010 |
| 23 | #define LTQ_ICU_IM0_IRSR 0x0018 |
| 24 | #define LTQ_ICU_IM0_IMR 0x0020 |
| 25 | #define LTQ_ICU_IM1_ISR 0x0028 |
| 26 | #define LTQ_ICU_OFFSET (LTQ_ICU_IM1_ISR - LTQ_ICU_IM0_ISR) |
| 27 | |
| 28 | #define LTQ_EIU_EXIN_C 0x0000 |
| 29 | #define LTQ_EIU_EXIN_INIC 0x0004 |
| 30 | #define LTQ_EIU_EXIN_INEN 0x000C |
| 31 | |
| 32 | /* irq numbers used by the external interrupt unit (EIU) */ |
| 33 | #define LTQ_EIU_IR0 (INT_NUM_IM4_IRL0 + 30) |
| 34 | #define LTQ_EIU_IR1 (INT_NUM_IM3_IRL0 + 31) |
| 35 | #define LTQ_EIU_IR2 (INT_NUM_IM1_IRL0 + 26) |
| 36 | #define LTQ_EIU_IR3 INT_NUM_IM1_IRL0 |
| 37 | #define LTQ_EIU_IR4 (INT_NUM_IM1_IRL0 + 1) |
| 38 | #define LTQ_EIU_IR5 (INT_NUM_IM1_IRL0 + 2) |
| 39 | #define LTQ_EIU_IR6 (INT_NUM_IM2_IRL0 + 30) |
| 40 | |
| 41 | #define MAX_EIU 6 |
| 42 | |
| 43 | /* irqs generated by device attached to the EBU need to be acked in |
| 44 | * a special manner |
| 45 | */ |
| 46 | #define LTQ_ICU_EBU_IRQ 22 |
| 47 | |
| 48 | #define ltq_icu_w32(x, y) ltq_w32((x), ltq_icu_membase + (y)) |
| 49 | #define ltq_icu_r32(x) ltq_r32(ltq_icu_membase + (x)) |
| 50 | |
| 51 | #define ltq_eiu_w32(x, y) ltq_w32((x), ltq_eiu_membase + (y)) |
| 52 | #define ltq_eiu_r32(x) ltq_r32(ltq_eiu_membase + (x)) |
| 53 | |
| 54 | static unsigned short ltq_eiu_irq[MAX_EIU] = { |
| 55 | LTQ_EIU_IR0, |
| 56 | LTQ_EIU_IR1, |
| 57 | LTQ_EIU_IR2, |
| 58 | LTQ_EIU_IR3, |
| 59 | LTQ_EIU_IR4, |
| 60 | LTQ_EIU_IR5, |
| 61 | }; |
| 62 | |
| 63 | static struct resource ltq_icu_resource = { |
| 64 | .name = "icu", |
| 65 | .start = LTQ_ICU_BASE_ADDR, |
| 66 | .end = LTQ_ICU_BASE_ADDR + LTQ_ICU_SIZE - 1, |
| 67 | .flags = IORESOURCE_MEM, |
| 68 | }; |
| 69 | |
| 70 | static struct resource ltq_eiu_resource = { |
| 71 | .name = "eiu", |
| 72 | .start = LTQ_EIU_BASE_ADDR, |
| 73 | .end = LTQ_EIU_BASE_ADDR + LTQ_ICU_SIZE - 1, |
| 74 | .flags = IORESOURCE_MEM, |
| 75 | }; |
| 76 | |
| 77 | static void __iomem *ltq_icu_membase; |
| 78 | static void __iomem *ltq_eiu_membase; |
| 79 | |
| 80 | void ltq_disable_irq(struct irq_data *d) |
| 81 | { |
| 82 | u32 ier = LTQ_ICU_IM0_IER; |
| 83 | int irq_nr = d->irq - INT_NUM_IRQ0; |
| 84 | |
| 85 | ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); |
| 86 | irq_nr %= INT_NUM_IM_OFFSET; |
| 87 | ltq_icu_w32(ltq_icu_r32(ier) & ~(1 << irq_nr), ier); |
| 88 | } |
| 89 | |
| 90 | void ltq_mask_and_ack_irq(struct irq_data *d) |
| 91 | { |
| 92 | u32 ier = LTQ_ICU_IM0_IER; |
| 93 | u32 isr = LTQ_ICU_IM0_ISR; |
| 94 | int irq_nr = d->irq - INT_NUM_IRQ0; |
| 95 | |
| 96 | ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); |
| 97 | isr += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); |
| 98 | irq_nr %= INT_NUM_IM_OFFSET; |
| 99 | ltq_icu_w32(ltq_icu_r32(ier) & ~(1 << irq_nr), ier); |
| 100 | ltq_icu_w32((1 << irq_nr), isr); |
| 101 | } |
| 102 | |
| 103 | static void ltq_ack_irq(struct irq_data *d) |
| 104 | { |
| 105 | u32 isr = LTQ_ICU_IM0_ISR; |
| 106 | int irq_nr = d->irq - INT_NUM_IRQ0; |
| 107 | |
| 108 | isr += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); |
| 109 | irq_nr %= INT_NUM_IM_OFFSET; |
| 110 | ltq_icu_w32((1 << irq_nr), isr); |
| 111 | } |
| 112 | |
| 113 | void ltq_enable_irq(struct irq_data *d) |
| 114 | { |
| 115 | u32 ier = LTQ_ICU_IM0_IER; |
| 116 | int irq_nr = d->irq - INT_NUM_IRQ0; |
| 117 | |
| 118 | ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); |
| 119 | irq_nr %= INT_NUM_IM_OFFSET; |
| 120 | ltq_icu_w32(ltq_icu_r32(ier) | (1 << irq_nr), ier); |
| 121 | } |
| 122 | |
| 123 | static unsigned int ltq_startup_eiu_irq(struct irq_data *d) |
| 124 | { |
| 125 | int i; |
| 126 | int irq_nr = d->irq - INT_NUM_IRQ0; |
| 127 | |
| 128 | ltq_enable_irq(d); |
| 129 | for (i = 0; i < MAX_EIU; i++) { |
| 130 | if (irq_nr == ltq_eiu_irq[i]) { |
| 131 | /* low level - we should really handle set_type */ |
| 132 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) | |
| 133 | (0x6 << (i * 4)), LTQ_EIU_EXIN_C); |
| 134 | /* clear all pending */ |
| 135 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INIC) & ~(1 << i), |
| 136 | LTQ_EIU_EXIN_INIC); |
| 137 | /* enable */ |
| 138 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) | (1 << i), |
| 139 | LTQ_EIU_EXIN_INEN); |
| 140 | break; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static void ltq_shutdown_eiu_irq(struct irq_data *d) |
| 148 | { |
| 149 | int i; |
| 150 | int irq_nr = d->irq - INT_NUM_IRQ0; |
| 151 | |
| 152 | ltq_disable_irq(d); |
| 153 | for (i = 0; i < MAX_EIU; i++) { |
| 154 | if (irq_nr == ltq_eiu_irq[i]) { |
| 155 | /* disable */ |
| 156 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) & ~(1 << i), |
| 157 | LTQ_EIU_EXIN_INEN); |
| 158 | break; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | static struct irq_chip ltq_irq_type = { |
| 164 | "icu", |
| 165 | .irq_enable = ltq_enable_irq, |
| 166 | .irq_disable = ltq_disable_irq, |
| 167 | .irq_unmask = ltq_enable_irq, |
| 168 | .irq_ack = ltq_ack_irq, |
| 169 | .irq_mask = ltq_disable_irq, |
| 170 | .irq_mask_ack = ltq_mask_and_ack_irq, |
| 171 | }; |
| 172 | |
| 173 | static struct irq_chip ltq_eiu_type = { |
| 174 | "eiu", |
| 175 | .irq_startup = ltq_startup_eiu_irq, |
| 176 | .irq_shutdown = ltq_shutdown_eiu_irq, |
| 177 | .irq_enable = ltq_enable_irq, |
| 178 | .irq_disable = ltq_disable_irq, |
| 179 | .irq_unmask = ltq_enable_irq, |
| 180 | .irq_ack = ltq_ack_irq, |
| 181 | .irq_mask = ltq_disable_irq, |
| 182 | .irq_mask_ack = ltq_mask_and_ack_irq, |
| 183 | }; |
| 184 | |
| 185 | static void ltq_hw_irqdispatch(int module) |
| 186 | { |
| 187 | u32 irq; |
| 188 | |
| 189 | irq = ltq_icu_r32(LTQ_ICU_IM0_IOSR + (module * LTQ_ICU_OFFSET)); |
| 190 | if (irq == 0) |
| 191 | return; |
| 192 | |
| 193 | /* silicon bug causes only the msb set to 1 to be valid. all |
| 194 | * other bits might be bogus |
| 195 | */ |
| 196 | irq = __fls(irq); |
| 197 | do_IRQ((int)irq + INT_NUM_IM0_IRL0 + (INT_NUM_IM_OFFSET * module)); |
| 198 | |
| 199 | /* if this is a EBU irq, we need to ack it or get a deadlock */ |
| 200 | if ((irq == LTQ_ICU_EBU_IRQ) && (module == 0)) |
| 201 | ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_ISTAT) | 0x10, |
| 202 | LTQ_EBU_PCC_ISTAT); |
| 203 | } |
| 204 | |
| 205 | #define DEFINE_HWx_IRQDISPATCH(x) \ |
| 206 | static void ltq_hw ## x ## _irqdispatch(void) \ |
| 207 | { \ |
| 208 | ltq_hw_irqdispatch(x); \ |
| 209 | } |
| 210 | DEFINE_HWx_IRQDISPATCH(0) |
| 211 | DEFINE_HWx_IRQDISPATCH(1) |
| 212 | DEFINE_HWx_IRQDISPATCH(2) |
| 213 | DEFINE_HWx_IRQDISPATCH(3) |
| 214 | DEFINE_HWx_IRQDISPATCH(4) |
| 215 | |
| 216 | static void ltq_hw5_irqdispatch(void) |
| 217 | { |
| 218 | do_IRQ(MIPS_CPU_TIMER_IRQ); |
| 219 | } |
| 220 | |
| 221 | asmlinkage void plat_irq_dispatch(void) |
| 222 | { |
| 223 | unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; |
| 224 | unsigned int i; |
| 225 | |
| 226 | if (pending & CAUSEF_IP7) { |
| 227 | do_IRQ(MIPS_CPU_TIMER_IRQ); |
| 228 | goto out; |
| 229 | } else { |
| 230 | for (i = 0; i < 5; i++) { |
| 231 | if (pending & (CAUSEF_IP2 << i)) { |
| 232 | ltq_hw_irqdispatch(i); |
| 233 | goto out; |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status()); |
| 238 | |
| 239 | out: |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | static struct irqaction cascade = { |
| 244 | .handler = no_action, |
| 245 | .flags = IRQF_DISABLED, |
| 246 | .name = "cascade", |
| 247 | }; |
| 248 | |
| 249 | void __init arch_init_irq(void) |
| 250 | { |
| 251 | int i; |
| 252 | |
| 253 | if (insert_resource(&iomem_resource, <q_icu_resource) < 0) |
| 254 | panic("Failed to insert icu memory\n"); |
| 255 | |
| 256 | if (request_mem_region(ltq_icu_resource.start, |
| 257 | resource_size(<q_icu_resource), "icu") < 0) |
| 258 | panic("Failed to request icu memory\n"); |
| 259 | |
| 260 | ltq_icu_membase = ioremap_nocache(ltq_icu_resource.start, |
| 261 | resource_size(<q_icu_resource)); |
| 262 | if (!ltq_icu_membase) |
| 263 | panic("Failed to remap icu memory\n"); |
| 264 | |
| 265 | if (insert_resource(&iomem_resource, <q_eiu_resource) < 0) |
| 266 | panic("Failed to insert eiu memory\n"); |
| 267 | |
| 268 | if (request_mem_region(ltq_eiu_resource.start, |
| 269 | resource_size(<q_eiu_resource), "eiu") < 0) |
| 270 | panic("Failed to request eiu memory\n"); |
| 271 | |
| 272 | ltq_eiu_membase = ioremap_nocache(ltq_eiu_resource.start, |
| 273 | resource_size(<q_eiu_resource)); |
| 274 | if (!ltq_eiu_membase) |
| 275 | panic("Failed to remap eiu memory\n"); |
| 276 | |
| 277 | /* make sure all irqs are turned off by default */ |
| 278 | for (i = 0; i < 5; i++) |
| 279 | ltq_icu_w32(0, LTQ_ICU_IM0_IER + (i * LTQ_ICU_OFFSET)); |
| 280 | |
| 281 | /* clear all possibly pending interrupts */ |
| 282 | ltq_icu_w32(~0, LTQ_ICU_IM0_ISR + (i * LTQ_ICU_OFFSET)); |
| 283 | |
| 284 | mips_cpu_irq_init(); |
| 285 | |
| 286 | for (i = 2; i <= 6; i++) |
| 287 | setup_irq(i, &cascade); |
| 288 | |
| 289 | if (cpu_has_vint) { |
| 290 | pr_info("Setting up vectored interrupts\n"); |
| 291 | set_vi_handler(2, ltq_hw0_irqdispatch); |
| 292 | set_vi_handler(3, ltq_hw1_irqdispatch); |
| 293 | set_vi_handler(4, ltq_hw2_irqdispatch); |
| 294 | set_vi_handler(5, ltq_hw3_irqdispatch); |
| 295 | set_vi_handler(6, ltq_hw4_irqdispatch); |
| 296 | set_vi_handler(7, ltq_hw5_irqdispatch); |
| 297 | } |
| 298 | |
| 299 | for (i = INT_NUM_IRQ0; |
| 300 | i <= (INT_NUM_IRQ0 + (5 * INT_NUM_IM_OFFSET)); i++) |
| 301 | if ((i == LTQ_EIU_IR0) || (i == LTQ_EIU_IR1) || |
| 302 | (i == LTQ_EIU_IR2)) |
| 303 | irq_set_chip_and_handler(i, <q_eiu_type, |
| 304 | handle_level_irq); |
| 305 | /* EIU3-5 only exist on ar9 and vr9 */ |
| 306 | else if (((i == LTQ_EIU_IR3) || (i == LTQ_EIU_IR4) || |
| 307 | (i == LTQ_EIU_IR5)) && (ltq_is_ar9() || ltq_is_vr9())) |
| 308 | irq_set_chip_and_handler(i, <q_eiu_type, |
| 309 | handle_level_irq); |
| 310 | else |
| 311 | irq_set_chip_and_handler(i, <q_irq_type, |
| 312 | handle_level_irq); |
| 313 | |
| 314 | #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) |
| 315 | set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | |
| 316 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); |
| 317 | #else |
| 318 | set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 | |
| 319 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); |
| 320 | #endif |
| 321 | } |
| 322 | |
| 323 | unsigned int __cpuinit get_c0_compare_int(void) |
| 324 | { |
| 325 | return CP0_LEGACY_COMPARE_IRQ; |
| 326 | } |