2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the NetLogic
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in
19 * the documentation and/or other materials provided with the
22 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/kernel.h>
36 #include <linux/init.h>
37 #include <linux/linkage.h>
38 #include <linux/interrupt.h>
40 #include <linux/slab.h>
41 #include <linux/irq.h>
43 #include <linux/irqdomain.h>
44 #include <linux/of_address.h>
45 #include <linux/of_irq.h>
47 #include <asm/errno.h>
48 #include <asm/signal.h>
49 #include <asm/ptrace.h>
50 #include <asm/mipsregs.h>
51 #include <asm/thread_info.h>
53 #include <asm/netlogic/mips-extns.h>
54 #include <asm/netlogic/interrupt.h>
55 #include <asm/netlogic/haldefs.h>
56 #include <asm/netlogic/common.h>
58 #if defined(CONFIG_CPU_XLP)
59 #include <asm/netlogic/xlp-hal/iomap.h>
60 #include <asm/netlogic/xlp-hal/xlp.h>
61 #include <asm/netlogic/xlp-hal/pic.h>
62 #elif defined(CONFIG_CPU_XLR)
63 #include <asm/netlogic/xlr/iomap.h>
64 #include <asm/netlogic/xlr/pic.h>
65 #include <asm/netlogic/xlr/fmn.h>
71 #define SMP_IRQ_MASK ((1ULL << IRQ_IPI_SMP_FUNCTION) | \
72 (1ULL << IRQ_IPI_SMP_RESCHEDULE))
74 #define SMP_IRQ_MASK 0
76 #define PERCPU_IRQ_MASK (SMP_IRQ_MASK | (1ull << IRQ_TIMER) | \
80 void (*extra_ack)(struct irq_data *);
81 struct nlm_soc_info *node;
87 static void xlp_pic_enable(struct irq_data *d)
90 struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
93 spin_lock_irqsave(&pd->node->piclock, flags);
94 nlm_pic_enable_irt(pd->node->picbase, pd->irt);
95 spin_unlock_irqrestore(&pd->node->piclock, flags);
98 static void xlp_pic_disable(struct irq_data *d)
100 struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
104 spin_lock_irqsave(&pd->node->piclock, flags);
105 nlm_pic_disable_irt(pd->node->picbase, pd->irt);
106 spin_unlock_irqrestore(&pd->node->piclock, flags);
109 static void xlp_pic_mask_ack(struct irq_data *d)
111 struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
113 clear_c0_eimr(pd->picirq);
114 ack_c0_eirr(pd->picirq);
117 static void xlp_pic_unmask(struct irq_data *d)
119 struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
126 /* re-enable the intr on this cpu */
127 set_c0_eimr(pd->picirq);
129 /* Ack is a single write, no need to lock */
130 nlm_pic_ack(pd->node->picbase, pd->irt);
133 static struct irq_chip xlp_pic = {
135 .irq_enable = xlp_pic_enable,
136 .irq_disable = xlp_pic_disable,
137 .irq_mask_ack = xlp_pic_mask_ack,
138 .irq_unmask = xlp_pic_unmask,
141 static void cpuintr_disable(struct irq_data *d)
143 clear_c0_eimr(d->irq);
146 static void cpuintr_enable(struct irq_data *d)
151 static void cpuintr_ack(struct irq_data *d)
157 * Chip definition for CPU originated interrupts(timer, msg) and
160 struct irq_chip nlm_cpu_intr = {
161 .name = "XLP-CPU-INTR",
162 .irq_enable = cpuintr_enable,
163 .irq_disable = cpuintr_disable,
164 .irq_mask = cpuintr_disable,
165 .irq_ack = cpuintr_ack,
166 .irq_eoi = cpuintr_enable,
169 static void __init nlm_init_percpu_irqs(void)
173 for (i = 0; i < PIC_IRT_FIRST_IRQ; i++)
174 irq_set_chip_and_handler(i, &nlm_cpu_intr, handle_percpu_irq);
176 irq_set_chip_and_handler(IRQ_IPI_SMP_FUNCTION, &nlm_cpu_intr,
177 nlm_smp_function_ipi_handler);
178 irq_set_chip_and_handler(IRQ_IPI_SMP_RESCHEDULE, &nlm_cpu_intr,
179 nlm_smp_resched_ipi_handler);
183 void nlm_setup_pic_irq(int node, int picirq, int irq, int irt)
185 struct nlm_pic_irq *pic_data;
188 xirq = nlm_irq_to_xirq(node, irq);
189 pic_data = kzalloc(sizeof(*pic_data), GFP_KERNEL);
190 BUG_ON(pic_data == NULL);
192 pic_data->picirq = picirq;
193 pic_data->node = nlm_get_node(node);
194 irq_set_chip_and_handler(xirq, &xlp_pic, handle_level_irq);
195 irq_set_handler_data(xirq, pic_data);
198 void nlm_set_pic_extra_ack(int node, int irq, void (*xack)(struct irq_data *))
200 struct nlm_pic_irq *pic_data;
203 xirq = nlm_irq_to_xirq(node, irq);
204 pic_data = irq_get_handler_data(xirq);
205 pic_data->extra_ack = xack;
208 static void nlm_init_node_irqs(int node)
212 struct nlm_soc_info *nodep;
214 pr_info("Init IRQ for node %d\n", node);
215 nodep = nlm_get_node(node);
216 irqmask = PERCPU_IRQ_MASK;
217 for (i = PIC_IRT_FIRST_IRQ; i <= PIC_IRT_LAST_IRQ; i++) {
218 irt = nlm_irq_to_irt(i);
221 nlm_setup_pic_irq(node, i, i, irt);
222 /* set interrupts to first cpu in node */
223 nlm_pic_init_irt(nodep->picbase, irt, i,
224 node * NLM_CPUS_PER_NODE, 0);
225 irqmask |= (1ull << i);
227 nodep->irqmask = irqmask;
230 void nlm_smp_irq_init(int hwcpuid)
234 node = hwcpuid / NLM_CPUS_PER_NODE;
235 cpu = hwcpuid % NLM_CPUS_PER_NODE;
237 if (cpu == 0 && node != 0)
238 nlm_init_node_irqs(node);
239 write_c0_eimr(nlm_current_node()->irqmask);
242 asmlinkage void plat_irq_dispatch(void)
248 eirr = read_c0_eirr_and_eimr();
253 /* per-CPU IRQs don't need translation */
254 if (i < PIC_IRQ_BASE) {
259 /* top level irq handling */
260 do_IRQ(nlm_irq_to_xirq(node, i));
264 static struct irq_domain *xlp_pic_domain;
266 static const struct irq_domain_ops xlp_pic_irq_domain_ops = {
267 .xlate = irq_domain_xlate_onetwocell,
270 static int __init xlp_of_pic_init(struct device_node *node,
271 struct device_node *parent)
273 const int n_picirqs = PIC_IRT_LAST_IRQ - PIC_IRQ_BASE + 1;
277 /* we need a hack to get the PIC's SoC chip id */
278 ret = of_address_to_resource(node, 0, &res);
280 pr_err("PIC %s: reg property not found!\n", node->name);
283 socid = (res.start >> 18) & 0x3;
284 xlp_pic_domain = irq_domain_add_legacy(node, n_picirqs,
285 nlm_irq_to_xirq(socid, PIC_IRQ_BASE), PIC_IRQ_BASE,
286 &xlp_pic_irq_domain_ops, NULL);
287 if (xlp_pic_domain == NULL) {
288 pr_err("PIC %s: Creating legacy domain failed!\n", node->name);
291 pr_info("Node %d: IRQ domain created for PIC@%pa\n", socid,
296 static struct of_device_id __initdata xlp_pic_irq_ids[] = {
297 { .compatible = "netlogic,xlp-pic", .data = xlp_of_pic_init },
302 void __init arch_init_irq(void)
304 /* Initialize the irq descriptors */
305 nlm_init_percpu_irqs();
306 nlm_init_node_irqs(0);
307 write_c0_eimr(nlm_current_node()->irqmask);
308 #if defined(CONFIG_CPU_XLR)
311 #if defined(CONFIG_OF)
312 of_irq_init(xlp_pic_irq_ids);