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>
25 #include <asm/errno.h>
47 static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
49 static inline unsigned int icp_native_get_xirr(void)
51 int cpu = smp_processor_id();
53 return in_be32(&icp_native_regs[cpu]->xirr.word);
56 static inline void icp_native_set_xirr(unsigned int value)
58 int cpu = smp_processor_id();
60 out_be32(&icp_native_regs[cpu]->xirr.word, value);
63 static inline void icp_native_set_cppr(u8 value)
65 int cpu = smp_processor_id();
67 out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
70 static inline void icp_native_set_qirr(int n_cpu, u8 value)
72 out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
75 static void icp_native_set_cpu_priority(unsigned char cppr)
77 xics_set_base_cppr(cppr);
78 icp_native_set_cppr(cppr);
82 static void icp_native_eoi(struct irq_data *d)
84 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
87 icp_native_set_xirr((xics_pop_cppr() << 24) | hw_irq);
90 static void icp_native_teardown_cpu(void)
92 int cpu = smp_processor_id();
94 /* Clear any pending IPI */
95 icp_native_set_qirr(cpu, 0xff);
98 static void icp_native_flush_ipi(void)
100 /* We take the ipi irq but and never return so we
101 * need to EOI the IPI, but want to leave our priority 0
103 * should we check all the other interrupts too?
104 * should we be flagging idle loop instead?
105 * or creating some task to be scheduled?
108 icp_native_set_xirr((0x00 << 24) | XICS_IPI);
111 static unsigned int icp_native_get_irq(void)
113 unsigned int xirr = icp_native_get_xirr();
114 unsigned int vec = xirr & 0x00ffffff;
117 if (vec == XICS_IRQ_SPURIOUS)
120 irq = irq_radix_revmap_lookup(xics_host, vec);
121 if (likely(irq != NO_IRQ)) {
126 /* We don't have a linux mapping, so have rtas mask it. */
127 xics_mask_unknown_vec(vec);
129 /* We might learn about it later, so EOI it */
130 icp_native_set_xirr(xirr);
137 static void icp_native_cause_ipi(int cpu, unsigned long data)
139 icp_native_set_qirr(cpu, IPI_PRIORITY);
142 static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
144 int cpu = smp_processor_id();
146 icp_native_set_qirr(cpu, 0xff);
148 return smp_ipi_demux();
151 #endif /* CONFIG_SMP */
153 static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
159 /* This may look gross but it's good enough for now, we don't quite
160 * have a hard -> linux processor id matching.
162 for_each_possible_cpu(i) {
165 if (hw_id == get_hard_smp_processor_id(i)) {
171 /* Fail, skip that CPU. Don't print, it's normal, some XICS come up
172 * with way more entries in there than you have CPUs
177 rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
180 if (!request_mem_region(addr, size, rname)) {
181 pr_warning("icp_native: Could not reserve ICP MMIO"
182 " for CPU %d, interrupt server #0x%x\n",
187 icp_native_regs[cpu] = ioremap(addr, size);
188 if (!icp_native_regs[cpu]) {
189 pr_warning("icp_native: Failed ioremap for CPU %d, "
190 "interrupt server #0x%x, addr %#lx\n",
192 release_mem_region(addr, size);
198 static int __init icp_native_init_one_node(struct device_node *np,
207 /* This code does the theorically broken assumption that the interrupt
208 * server numbers are the same as the hard CPU numbers.
209 * This happens to be the case so far but we are playing with fire...
210 * should be fixed one of these days. -BenH.
212 ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);
214 /* Do that ever happen ? we'll know soon enough... but even good'old
215 * f80 does have that property ..
217 WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32)));
220 *indx = of_read_number(ireg, 1);
221 if (ilen >= 2*sizeof(u32))
222 num_servers = of_read_number(ireg + 1, 1);
225 ireg = of_get_property(np, "reg", &ilen);
227 pr_err("icp_native: Can't find interrupt reg property");
231 reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
232 if (((ilen % reg_tuple_size) != 0)
233 || (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
234 pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
235 ilen / reg_tuple_size, num_servers);
239 for (i = 0; i < (ilen / reg_tuple_size); i++) {
243 err = of_address_to_resource(np, i, &r);
245 pr_err("icp_native: Could not translate ICP MMIO"
246 " for interrupt server 0x%x (%d)\n", *indx, err);
250 if (icp_native_map_one_cpu(*indx, r.start, r.end - r.start))
258 static const struct icp_ops icp_native_ops = {
259 .get_irq = icp_native_get_irq,
260 .eoi = icp_native_eoi,
261 .set_priority = icp_native_set_cpu_priority,
262 .teardown_cpu = icp_native_teardown_cpu,
263 .flush_ipi = icp_native_flush_ipi,
265 .ipi_action = icp_native_ipi_action,
266 .cause_ipi = icp_native_cause_ipi,
270 int icp_native_init(void)
272 struct device_node *np;
276 for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
277 if (icp_native_init_one_node(np, &indx) == 0)
280 for_each_node_by_type(np,
281 "PowerPC-External-Interrupt-Presentation") {
282 if (icp_native_init_one_node(np, &indx) == 0)
290 icp_ops = &icp_native_ops;