2 * Copyright 2011 IBM Corporation.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/irq.h>
14 #include <linux/smp.h>
15 #include <linux/interrupt.h>
16 #include <linux/init.h>
17 #include <linux/cpu.h>
19 #include <linux/spinlock.h>
20 #include <linux/module.h>
26 #include <asm/errno.h>
28 #include <asm/kvm_ppc.h>
29 #include <asm/dbell.h>
50 static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
52 static inline unsigned int icp_native_get_xirr(void)
54 int cpu = smp_processor_id();
57 /* Handled an interrupt latched by KVM */
58 xirr = kvmppc_get_xics_latch();
62 return in_be32(&icp_native_regs[cpu]->xirr.word);
65 static inline void icp_native_set_xirr(unsigned int value)
67 int cpu = smp_processor_id();
69 out_be32(&icp_native_regs[cpu]->xirr.word, value);
72 static inline void icp_native_set_cppr(u8 value)
74 int cpu = smp_processor_id();
76 out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
79 static inline void icp_native_set_qirr(int n_cpu, u8 value)
81 out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
84 static void icp_native_set_cpu_priority(unsigned char cppr)
86 xics_set_base_cppr(cppr);
87 icp_native_set_cppr(cppr);
91 void icp_native_eoi(struct irq_data *d)
93 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
96 icp_native_set_xirr((xics_pop_cppr() << 24) | hw_irq);
99 static void icp_native_teardown_cpu(void)
101 int cpu = smp_processor_id();
103 /* Clear any pending IPI */
104 icp_native_set_qirr(cpu, 0xff);
107 static void icp_native_flush_ipi(void)
109 /* We take the ipi irq but and never return so we
110 * need to EOI the IPI, but want to leave our priority 0
112 * should we check all the other interrupts too?
113 * should we be flagging idle loop instead?
114 * or creating some task to be scheduled?
117 icp_native_set_xirr((0x00 << 24) | XICS_IPI);
120 static unsigned int icp_native_get_irq(void)
122 unsigned int xirr = icp_native_get_xirr();
123 unsigned int vec = xirr & 0x00ffffff;
126 if (vec == XICS_IRQ_SPURIOUS)
129 irq = irq_find_mapping(xics_host, vec);
130 if (likely(irq != NO_IRQ)) {
135 /* We don't have a linux mapping, so have rtas mask it. */
136 xics_mask_unknown_vec(vec);
138 /* We might learn about it later, so EOI it */
139 icp_native_set_xirr(xirr);
146 static void icp_native_cause_ipi(int cpu, unsigned long data)
148 kvmppc_set_host_ipi(cpu, 1);
149 #ifdef CONFIG_PPC_DOORBELL
150 if (cpu_has_feature(CPU_FTR_DBELL)) {
151 if (cpumask_test_cpu(cpu, cpu_sibling_mask(get_cpu()))) {
152 doorbell_cause_ipi(cpu, data);
159 icp_native_set_qirr(cpu, IPI_PRIORITY);
163 * Called when an interrupt is received on an off-line CPU to
164 * clear the interrupt, so that the CPU can go back to nap mode.
166 void icp_native_flush_interrupt(void)
168 unsigned int xirr = icp_native_get_xirr();
169 unsigned int vec = xirr & 0x00ffffff;
171 if (vec == XICS_IRQ_SPURIOUS)
173 if (vec == XICS_IPI) {
174 /* Clear pending IPI */
175 int cpu = smp_processor_id();
176 kvmppc_set_host_ipi(cpu, 0);
177 icp_native_set_qirr(cpu, 0xff);
179 pr_err("XICS: hw interrupt 0x%x to offline cpu, disabling\n",
181 xics_mask_unknown_vec(vec);
183 /* EOI the interrupt */
184 icp_native_set_xirr(xirr);
187 void xics_wake_cpu(int cpu)
189 icp_native_set_qirr(cpu, IPI_PRIORITY);
191 EXPORT_SYMBOL_GPL(xics_wake_cpu);
193 static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
195 int cpu = smp_processor_id();
197 kvmppc_set_host_ipi(cpu, 0);
198 icp_native_set_qirr(cpu, 0xff);
200 return smp_ipi_demux();
203 #endif /* CONFIG_SMP */
205 static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
211 /* This may look gross but it's good enough for now, we don't quite
212 * have a hard -> linux processor id matching.
214 for_each_possible_cpu(i) {
217 if (hw_id == get_hard_smp_processor_id(i)) {
223 /* Fail, skip that CPU. Don't print, it's normal, some XICS come up
224 * with way more entries in there than you have CPUs
229 rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
232 if (!request_mem_region(addr, size, rname)) {
233 pr_warning("icp_native: Could not reserve ICP MMIO"
234 " for CPU %d, interrupt server #0x%x\n",
239 icp_native_regs[cpu] = ioremap(addr, size);
240 kvmppc_set_xics_phys(cpu, addr);
241 if (!icp_native_regs[cpu]) {
242 pr_warning("icp_native: Failed ioremap for CPU %d, "
243 "interrupt server #0x%x, addr %#lx\n",
245 release_mem_region(addr, size);
251 static int __init icp_native_init_one_node(struct device_node *np,
260 /* This code does the theorically broken assumption that the interrupt
261 * server numbers are the same as the hard CPU numbers.
262 * This happens to be the case so far but we are playing with fire...
263 * should be fixed one of these days. -BenH.
265 ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);
267 /* Do that ever happen ? we'll know soon enough... but even good'old
268 * f80 does have that property ..
270 WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32)));
273 *indx = of_read_number(ireg, 1);
274 if (ilen >= 2*sizeof(u32))
275 num_servers = of_read_number(ireg + 1, 1);
278 ireg = of_get_property(np, "reg", &ilen);
280 pr_err("icp_native: Can't find interrupt reg property");
284 reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
285 if (((ilen % reg_tuple_size) != 0)
286 || (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
287 pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
288 ilen / reg_tuple_size, num_servers);
292 for (i = 0; i < (ilen / reg_tuple_size); i++) {
296 err = of_address_to_resource(np, i, &r);
298 pr_err("icp_native: Could not translate ICP MMIO"
299 " for interrupt server 0x%x (%d)\n", *indx, err);
303 if (icp_native_map_one_cpu(*indx, r.start, resource_size(&r)))
311 static const struct icp_ops icp_native_ops = {
312 .get_irq = icp_native_get_irq,
313 .eoi = icp_native_eoi,
314 .set_priority = icp_native_set_cpu_priority,
315 .teardown_cpu = icp_native_teardown_cpu,
316 .flush_ipi = icp_native_flush_ipi,
318 .ipi_action = icp_native_ipi_action,
319 .cause_ipi = icp_native_cause_ipi,
323 int __init icp_native_init(void)
325 struct device_node *np;
329 for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
330 if (icp_native_init_one_node(np, &indx) == 0)
333 for_each_node_by_type(np,
334 "PowerPC-External-Interrupt-Presentation") {
335 if (icp_native_init_one_node(np, &indx) == 0)
343 icp_ops = &icp_native_ops;