Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 1 | /* |
Arnd Bergmann | f3f66f5 | 2005-10-31 20:08:37 -0500 | [diff] [blame] | 2 | * Cell Internal Interrupt Controller |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 3 | * |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 4 | * Copyright (C) 2006 Benjamin Herrenschmidt (benh@kernel.crashing.org) |
| 5 | * IBM, Corp. |
| 6 | * |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 7 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
| 8 | * |
| 9 | * Author: Arnd Bergmann <arndb@de.ibm.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2, or (at your option) |
| 14 | * any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 24 | * |
| 25 | * TODO: |
| 26 | * - Fix various assumptions related to HW CPU numbers vs. linux CPU numbers |
| 27 | * vs node numbers in the setup code |
| 28 | * - Implement proper handling of maxcpus=1/2 (that is, routing of irqs from |
| 29 | * a non-active node to the active node) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 30 | */ |
| 31 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/irq.h> |
Arnd Bergmann | 2fb9d20 | 2006-01-05 14:05:29 +0000 | [diff] [blame] | 34 | #include <linux/module.h> |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 35 | #include <linux/percpu.h> |
| 36 | #include <linux/types.h> |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 37 | #include <linux/ioport.h> |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 38 | |
| 39 | #include <asm/io.h> |
| 40 | #include <asm/pgtable.h> |
| 41 | #include <asm/prom.h> |
| 42 | #include <asm/ptrace.h> |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 43 | #include <asm/machdep.h> |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 44 | |
Arnd Bergmann | f3f66f5 | 2005-10-31 20:08:37 -0500 | [diff] [blame] | 45 | #include "interrupt.h" |
Benjamin Herrenschmidt | acf7d76 | 2006-06-19 20:33:16 +0200 | [diff] [blame] | 46 | #include "cbe_regs.h" |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 47 | |
| 48 | struct iic { |
Benjamin Herrenschmidt | acf7d76 | 2006-06-19 20:33:16 +0200 | [diff] [blame] | 49 | struct cbe_iic_thread_regs __iomem *regs; |
Arnd Bergmann | 2fb9d20 | 2006-01-05 14:05:29 +0000 | [diff] [blame] | 50 | u8 target_id; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 51 | u8 eoi_stack[16]; |
| 52 | int eoi_ptr; |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 53 | struct device_node *node; |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 54 | }; |
| 55 | |
| 56 | static DEFINE_PER_CPU(struct iic, iic); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 57 | #define IIC_NODE_COUNT 2 |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 58 | static struct irq_host *iic_host; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 59 | |
| 60 | /* Convert between "pending" bits and hw irq number */ |
| 61 | static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits) |
| 62 | { |
| 63 | unsigned char unit = bits.source & 0xf; |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 64 | unsigned char node = bits.source >> 4; |
| 65 | unsigned char class = bits.class & 3; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 66 | |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 67 | /* Decode IPIs */ |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 68 | if (bits.flags & CBE_IIC_IRQ_IPI) |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 69 | return IIC_IRQ_TYPE_IPI | (bits.prio >> 4); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 70 | else |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 71 | return (node << IIC_IRQ_NODE_SHIFT) | (class << 4) | unit; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 72 | } |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 73 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 74 | static void iic_mask(unsigned int irq) |
| 75 | { |
| 76 | } |
| 77 | |
| 78 | static void iic_unmask(unsigned int irq) |
| 79 | { |
| 80 | } |
| 81 | |
| 82 | static void iic_eoi(unsigned int irq) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 83 | { |
Arnd Bergmann | 5536408 | 2006-03-23 00:00:07 +0100 | [diff] [blame] | 84 | struct iic *iic = &__get_cpu_var(iic); |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 85 | out_be64(&iic->regs->prio, iic->eoi_stack[--iic->eoi_ptr]); |
| 86 | BUG_ON(iic->eoi_ptr < 0); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 87 | } |
| 88 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 89 | static struct irq_chip iic_chip = { |
Arnd Bergmann | f3f66f5 | 2005-10-31 20:08:37 -0500 | [diff] [blame] | 90 | .typename = " CELL-IIC ", |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 91 | .mask = iic_mask, |
| 92 | .unmask = iic_unmask, |
| 93 | .eoi = iic_eoi, |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 94 | }; |
| 95 | |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 96 | |
| 97 | static void iic_ioexc_eoi(unsigned int irq) |
| 98 | { |
| 99 | } |
| 100 | |
Olaf Hering | 35a84c2 | 2006-10-07 22:08:26 +1000 | [diff] [blame^] | 101 | static void iic_ioexc_cascade(unsigned int irq, struct irq_desc *desc) |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 102 | { |
Arnd Bergmann | 43b4f40 | 2006-10-04 17:26:24 +0200 | [diff] [blame] | 103 | struct cbe_iic_regs __iomem *node_iic = (void __iomem *)desc->handler_data; |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 104 | unsigned int base = (irq & 0xffffff00) | IIC_IRQ_TYPE_IOEXC; |
| 105 | unsigned long bits, ack; |
| 106 | int cascade; |
| 107 | |
| 108 | for (;;) { |
| 109 | bits = in_be64(&node_iic->iic_is); |
| 110 | if (bits == 0) |
| 111 | break; |
| 112 | /* pre-ack edge interrupts */ |
| 113 | ack = bits & IIC_ISR_EDGE_MASK; |
| 114 | if (ack) |
| 115 | out_be64(&node_iic->iic_is, ack); |
| 116 | /* handle them */ |
| 117 | for (cascade = 63; cascade >= 0; cascade--) |
| 118 | if (bits & (0x8000000000000000UL >> cascade)) { |
| 119 | unsigned int cirq = |
| 120 | irq_linear_revmap(iic_host, |
| 121 | base | cascade); |
| 122 | if (cirq != NO_IRQ) |
Olof Johansson | 49f19ce | 2006-10-05 20:31:10 -0500 | [diff] [blame] | 123 | generic_handle_irq(cirq); |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 124 | } |
| 125 | /* post-ack level interrupts */ |
| 126 | ack = bits & ~IIC_ISR_EDGE_MASK; |
| 127 | if (ack) |
| 128 | out_be64(&node_iic->iic_is, ack); |
| 129 | } |
| 130 | desc->chip->eoi(irq); |
| 131 | } |
| 132 | |
| 133 | |
| 134 | static struct irq_chip iic_ioexc_chip = { |
| 135 | .typename = " CELL-IOEX", |
| 136 | .mask = iic_mask, |
| 137 | .unmask = iic_unmask, |
| 138 | .eoi = iic_ioexc_eoi, |
| 139 | }; |
| 140 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 141 | /* Get an IRQ number from the pending state register of the IIC */ |
Olaf Hering | 35a84c2 | 2006-10-07 22:08:26 +1000 | [diff] [blame^] | 142 | static unsigned int iic_get_irq(void) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 143 | { |
Geoff Levand | 9e6ee34 | 2006-08-09 15:28:13 -0700 | [diff] [blame] | 144 | struct cbe_iic_pending_bits pending; |
| 145 | struct iic *iic; |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 146 | unsigned int virq; |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 147 | |
Geoff Levand | 9e6ee34 | 2006-08-09 15:28:13 -0700 | [diff] [blame] | 148 | iic = &__get_cpu_var(iic); |
| 149 | *(unsigned long *) &pending = |
| 150 | in_be64((unsigned long __iomem *) &iic->regs->pending_destr); |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 151 | if (!(pending.flags & CBE_IIC_IRQ_VALID)) |
| 152 | return NO_IRQ; |
| 153 | virq = irq_linear_revmap(iic_host, iic_pending_to_hwnum(pending)); |
| 154 | if (virq == NO_IRQ) |
| 155 | return NO_IRQ; |
Geoff Levand | 9e6ee34 | 2006-08-09 15:28:13 -0700 | [diff] [blame] | 156 | iic->eoi_stack[++iic->eoi_ptr] = pending.prio; |
| 157 | BUG_ON(iic->eoi_ptr > 15); |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 158 | return virq; |
Jens Osterkamp | d0e57c6 | 2006-03-23 00:00:06 +0100 | [diff] [blame] | 159 | } |
| 160 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 161 | #ifdef CONFIG_SMP |
Arnd Bergmann | a84195f | 2005-08-18 19:35:21 +0200 | [diff] [blame] | 162 | |
| 163 | /* Use the highest interrupt priorities for IPI */ |
| 164 | static inline int iic_ipi_to_irq(int ipi) |
| 165 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 166 | return IIC_IRQ_TYPE_IPI + 0xf - ipi; |
Arnd Bergmann | a84195f | 2005-08-18 19:35:21 +0200 | [diff] [blame] | 167 | } |
| 168 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 169 | void iic_setup_cpu(void) |
| 170 | { |
| 171 | out_be64(&__get_cpu_var(iic).regs->prio, 0xff); |
| 172 | } |
| 173 | |
| 174 | void iic_cause_IPI(int cpu, int mesg) |
| 175 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 176 | out_be64(&per_cpu(iic, cpu).regs->generate, (0xf - mesg) << 4); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 177 | } |
| 178 | |
Arnd Bergmann | 2fb9d20 | 2006-01-05 14:05:29 +0000 | [diff] [blame] | 179 | u8 iic_get_target_id(int cpu) |
| 180 | { |
| 181 | return per_cpu(iic, cpu).target_id; |
| 182 | } |
| 183 | EXPORT_SYMBOL_GPL(iic_get_target_id); |
| 184 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 185 | struct irq_host *iic_get_irq_host(int node) |
| 186 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 187 | return iic_host; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 188 | } |
| 189 | EXPORT_SYMBOL_GPL(iic_get_irq_host); |
| 190 | |
| 191 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 192 | static irqreturn_t iic_ipi_action(int irq, void *dev_id) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 193 | { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 194 | int ipi = (int)(long)dev_id; |
| 195 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 196 | smp_message_recv(ipi); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 197 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 198 | return IRQ_HANDLED; |
| 199 | } |
Arnd Bergmann | a84195f | 2005-08-18 19:35:21 +0200 | [diff] [blame] | 200 | static void iic_request_ipi(int ipi, const char *name) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 201 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 202 | int virq; |
Arnd Bergmann | a84195f | 2005-08-18 19:35:21 +0200 | [diff] [blame] | 203 | |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 204 | virq = irq_create_mapping(iic_host, iic_ipi_to_irq(ipi)); |
| 205 | if (virq == NO_IRQ) { |
| 206 | printk(KERN_ERR |
| 207 | "iic: failed to map IPI %s\n", name); |
| 208 | return; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 209 | } |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 210 | if (request_irq(virq, iic_ipi_action, IRQF_DISABLED, name, |
| 211 | (void *)(long)ipi)) |
| 212 | printk(KERN_ERR |
| 213 | "iic: failed to request IPI %s\n", name); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | void iic_request_IPIs(void) |
| 217 | { |
Arnd Bergmann | a84195f | 2005-08-18 19:35:21 +0200 | [diff] [blame] | 218 | iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call"); |
| 219 | iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched"); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 220 | #ifdef CONFIG_DEBUGGER |
Arnd Bergmann | a84195f | 2005-08-18 19:35:21 +0200 | [diff] [blame] | 221 | iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug"); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 222 | #endif /* CONFIG_DEBUGGER */ |
| 223 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 224 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 225 | #endif /* CONFIG_SMP */ |
| 226 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 227 | |
| 228 | static int iic_host_match(struct irq_host *h, struct device_node *node) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 229 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 230 | return device_is_compatible(node, |
| 231 | "IBM,CBEA-Internal-Interrupt-Controller"); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 232 | } |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 233 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 234 | static int iic_host_map(struct irq_host *h, unsigned int virq, |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 235 | irq_hw_number_t hw) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 236 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 237 | switch (hw & IIC_IRQ_TYPE_MASK) { |
| 238 | case IIC_IRQ_TYPE_IPI: |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 239 | set_irq_chip_and_handler(virq, &iic_chip, handle_percpu_irq); |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 240 | break; |
| 241 | case IIC_IRQ_TYPE_IOEXC: |
| 242 | set_irq_chip_and_handler(virq, &iic_ioexc_chip, |
| 243 | handle_fasteoi_irq); |
| 244 | break; |
| 245 | default: |
| 246 | set_irq_chip_and_handler(virq, &iic_chip, handle_fasteoi_irq); |
| 247 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 248 | return 0; |
| 249 | } |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 250 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 251 | static int iic_host_xlate(struct irq_host *h, struct device_node *ct, |
| 252 | u32 *intspec, unsigned int intsize, |
| 253 | irq_hw_number_t *out_hwirq, unsigned int *out_flags) |
| 254 | |
| 255 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 256 | unsigned int node, ext, unit, class; |
| 257 | const u32 *val; |
| 258 | |
| 259 | if (!device_is_compatible(ct, |
| 260 | "IBM,CBEA-Internal-Interrupt-Controller")) |
| 261 | return -ENODEV; |
| 262 | if (intsize != 1) |
| 263 | return -ENODEV; |
| 264 | val = get_property(ct, "#interrupt-cells", NULL); |
| 265 | if (val == NULL || *val != 1) |
| 266 | return -ENODEV; |
| 267 | |
| 268 | node = intspec[0] >> 24; |
| 269 | ext = (intspec[0] >> 16) & 0xff; |
| 270 | class = (intspec[0] >> 8) & 0xff; |
| 271 | unit = intspec[0] & 0xff; |
| 272 | |
| 273 | /* Check if node is in supported range */ |
| 274 | if (node > 1) |
| 275 | return -EINVAL; |
| 276 | |
| 277 | /* Build up interrupt number, special case for IO exceptions */ |
| 278 | *out_hwirq = (node << IIC_IRQ_NODE_SHIFT); |
| 279 | if (unit == IIC_UNIT_IIC && class == 1) |
| 280 | *out_hwirq |= IIC_IRQ_TYPE_IOEXC | ext; |
| 281 | else |
| 282 | *out_hwirq |= IIC_IRQ_TYPE_NORMAL | |
| 283 | (class << IIC_IRQ_CLASS_SHIFT) | unit; |
| 284 | |
| 285 | /* Dummy flags, ignored by iic code */ |
| 286 | *out_flags = IRQ_TYPE_EDGE_RISING; |
| 287 | |
| 288 | return 0; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | static struct irq_host_ops iic_host_ops = { |
| 292 | .match = iic_host_match, |
| 293 | .map = iic_host_map, |
| 294 | .xlate = iic_host_xlate, |
| 295 | }; |
| 296 | |
| 297 | static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr, |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 298 | struct device_node *node) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 299 | { |
| 300 | /* XXX FIXME: should locate the linux CPU number from the HW cpu |
| 301 | * number properly. We are lucky for now |
| 302 | */ |
| 303 | struct iic *iic = &per_cpu(iic, hw_cpu); |
| 304 | |
| 305 | iic->regs = ioremap(addr, sizeof(struct cbe_iic_thread_regs)); |
| 306 | BUG_ON(iic->regs == NULL); |
| 307 | |
| 308 | iic->target_id = ((hw_cpu & 2) << 3) | ((hw_cpu & 1) ? 0xf : 0xe); |
| 309 | iic->eoi_stack[0] = 0xff; |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 310 | iic->node = of_node_get(node); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 311 | out_be64(&iic->regs->prio, 0); |
| 312 | |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 313 | printk(KERN_INFO "IIC for CPU %d target id 0x%x : %s\n", |
| 314 | hw_cpu, iic->target_id, node->full_name); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | static int __init setup_iic(void) |
| 318 | { |
| 319 | struct device_node *dn; |
| 320 | struct resource r0, r1; |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 321 | unsigned int node, cascade, found = 0; |
Arnd Bergmann | 43b4f40 | 2006-10-04 17:26:24 +0200 | [diff] [blame] | 322 | struct cbe_iic_regs __iomem *node_iic; |
Geoff Levand | 9e6ee34 | 2006-08-09 15:28:13 -0700 | [diff] [blame] | 323 | const u32 *np; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 324 | |
| 325 | for (dn = NULL; |
| 326 | (dn = of_find_node_by_name(dn,"interrupt-controller")) != NULL;) { |
| 327 | if (!device_is_compatible(dn, |
| 328 | "IBM,CBEA-Internal-Interrupt-Controller")) |
| 329 | continue; |
Jeremy Kerr | c61c27d | 2006-07-12 15:39:54 +1000 | [diff] [blame] | 330 | np = get_property(dn, "ibm,interrupt-server-ranges", NULL); |
Geoff Levand | 9e6ee34 | 2006-08-09 15:28:13 -0700 | [diff] [blame] | 331 | if (np == NULL) { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 332 | printk(KERN_WARNING "IIC: CPU association not found\n"); |
| 333 | of_node_put(dn); |
| 334 | return -ENODEV; |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 335 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 336 | if (of_address_to_resource(dn, 0, &r0) || |
| 337 | of_address_to_resource(dn, 1, &r1)) { |
| 338 | printk(KERN_WARNING "IIC: Can't resolve addresses\n"); |
| 339 | of_node_put(dn); |
| 340 | return -ENODEV; |
| 341 | } |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 342 | found++; |
| 343 | init_one_iic(np[0], r0.start, dn); |
| 344 | init_one_iic(np[1], r1.start, dn); |
| 345 | |
| 346 | /* Setup cascade for IO exceptions. XXX cleanup tricks to get |
| 347 | * node vs CPU etc... |
| 348 | * Note that we configure the IIC_IRR here with a hard coded |
| 349 | * priority of 1. We might want to improve that later. |
| 350 | */ |
| 351 | node = np[0] >> 1; |
| 352 | node_iic = cbe_get_cpu_iic_regs(np[0]); |
| 353 | cascade = node << IIC_IRQ_NODE_SHIFT; |
| 354 | cascade |= 1 << IIC_IRQ_CLASS_SHIFT; |
| 355 | cascade |= IIC_UNIT_IIC; |
| 356 | cascade = irq_create_mapping(iic_host, cascade); |
| 357 | if (cascade == NO_IRQ) |
| 358 | continue; |
Arnd Bergmann | 43b4f40 | 2006-10-04 17:26:24 +0200 | [diff] [blame] | 359 | /* |
| 360 | * irq_data is a generic pointer that gets passed back |
| 361 | * to us later, so the forced cast is fine. |
| 362 | */ |
| 363 | set_irq_data(cascade, (void __force *)node_iic); |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 364 | set_irq_chained_handler(cascade , iic_ioexc_cascade); |
| 365 | out_be64(&node_iic->iic_ir, |
| 366 | (1 << 12) /* priority */ | |
| 367 | (node << 4) /* dest node */ | |
| 368 | IIC_UNIT_THREAD_0 /* route them to thread 0 */); |
| 369 | /* Flush pending (make sure it triggers if there is |
| 370 | * anything pending |
| 371 | */ |
| 372 | out_be64(&node_iic->iic_is, 0xfffffffffffffffful); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 373 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 374 | |
| 375 | if (found) |
| 376 | return 0; |
| 377 | else |
| 378 | return -ENODEV; |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 379 | } |
| 380 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 381 | void __init iic_init_IRQ(void) |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 382 | { |
Benjamin Herrenschmidt | 2e19458 | 2006-09-29 15:00:29 +1000 | [diff] [blame] | 383 | /* Setup an irq host data structure */ |
| 384 | iic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT, |
| 385 | &iic_host_ops, IIC_IRQ_INVALID); |
| 386 | BUG_ON(iic_host == NULL); |
| 387 | irq_set_default_host(iic_host); |
| 388 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 389 | /* Discover and initialize iics */ |
Jens Osterkamp | d0e57c6 | 2006-03-23 00:00:06 +0100 | [diff] [blame] | 390 | if (setup_iic() < 0) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 391 | panic("IIC: Failed to initialize !\n"); |
Jens Osterkamp | d0e57c6 | 2006-03-23 00:00:06 +0100 | [diff] [blame] | 392 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 393 | /* Set master interrupt handling function */ |
| 394 | ppc_md.get_irq = iic_get_irq; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 395 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 396 | /* Enable on current CPU */ |
| 397 | iic_setup_cpu(); |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 398 | } |