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.
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/irq.h>
13 #include <linux/smp.h>
14 #include <linux/interrupt.h>
15 #include <linux/init.h>
16 #include <linux/cpu.h>
21 #include <asm/errno.h>
24 #include <asm/hvcall.h>
26 static inline unsigned int icp_hv_get_xirr(unsigned char cppr)
28 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
31 rc = plpar_hcall(H_XIRR, retbuf, cppr);
33 panic(" bad return code xirr - rc = %lx\n", rc);
34 return (unsigned int)retbuf[0];
37 static inline void icp_hv_set_xirr(unsigned int value)
39 long rc = plpar_hcall_norets(H_EOI, value);
41 panic("bad return code EOI - rc = %ld, value=%x\n", rc, value);
44 static inline void icp_hv_set_cppr(u8 value)
46 long rc = plpar_hcall_norets(H_CPPR, value);
48 panic("bad return code cppr - rc = %lx\n", rc);
51 static inline void icp_hv_set_qirr(int n_cpu , u8 value)
53 long rc = plpar_hcall_norets(H_IPI, get_hard_smp_processor_id(n_cpu),
56 panic("bad return code qirr - rc = %lx\n", rc);
59 static void icp_hv_eoi(struct irq_data *d)
61 unsigned int hw_irq = (unsigned int)irq_data_to_hw(d);
64 icp_hv_set_xirr((xics_pop_cppr() << 24) | hw_irq);
67 static void icp_hv_teardown_cpu(void)
69 int cpu = smp_processor_id();
71 /* Clear any pending IPI */
72 icp_hv_set_qirr(cpu, 0xff);
75 static void icp_hv_flush_ipi(void)
77 /* We take the ipi irq but and never return so we
78 * need to EOI the IPI, but want to leave our priority 0
80 * should we check all the other interrupts too?
81 * should we be flagging idle loop instead?
82 * or creating some task to be scheduled?
85 icp_hv_set_xirr((0x00 << 24) | XICS_IPI);
88 static unsigned int icp_hv_get_irq(void)
90 unsigned int xirr = icp_hv_get_xirr(xics_cppr_top());
91 unsigned int vec = xirr & 0x00ffffff;
94 if (vec == XICS_IRQ_SPURIOUS)
97 irq = irq_radix_revmap_lookup(xics_host, vec);
98 if (likely(irq != NO_IRQ)) {
103 /* We don't have a linux mapping, so have rtas mask it. */
104 xics_mask_unknown_vec(vec);
106 /* We might learn about it later, so EOI it */
107 icp_hv_set_xirr(xirr);
112 static void icp_hv_set_cpu_priority(unsigned char cppr)
114 xics_set_base_cppr(cppr);
115 icp_hv_set_cppr(cppr);
121 static inline void icp_hv_do_message(int cpu, int msg)
123 unsigned long *tgt = &per_cpu(xics_ipi_message, cpu);
127 icp_hv_set_qirr(cpu, IPI_PRIORITY);
130 static void icp_hv_message_pass(int target, int msg)
134 if (target < NR_CPUS) {
135 icp_hv_do_message(target, msg);
137 for_each_online_cpu(i) {
138 if (target == MSG_ALL_BUT_SELF
139 && i == smp_processor_id())
141 icp_hv_do_message(i, msg);
146 static irqreturn_t icp_hv_ipi_action(int irq, void *dev_id)
148 int cpu = smp_processor_id();
150 icp_hv_set_qirr(cpu, 0xff);
152 return xics_ipi_dispatch(cpu);
155 #endif /* CONFIG_SMP */
157 static const struct icp_ops icp_hv_ops = {
158 .get_irq = icp_hv_get_irq,
160 .set_priority = icp_hv_set_cpu_priority,
161 .teardown_cpu = icp_hv_teardown_cpu,
162 .flush_ipi = icp_hv_flush_ipi,
164 .ipi_action = icp_hv_ipi_action,
165 .message_pass = icp_hv_message_pass,
169 int icp_hv_init(void)
171 struct device_node *np;
173 np = of_find_compatible_node(NULL, NULL, "ibm,ppc-xicp");
175 np = of_find_node_by_type(NULL,
176 "PowerPC-External-Interrupt-Presentation");
180 icp_ops = &icp_hv_ops;