x86, efi: Set runtime_version to the EFI spec revision
[linux/fpc-iii.git] / arch / powerpc / sysdev / xics / icp-native.c
blob48861d3fcd070cbc56f4e4189e4396f7196938c4
1 /*
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.
9 */
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>
18 #include <linux/of.h>
19 #include <linux/spinlock.h>
20 #include <linux/module.h>
22 #include <asm/prom.h>
23 #include <asm/io.h>
24 #include <asm/smp.h>
25 #include <asm/irq.h>
26 #include <asm/errno.h>
27 #include <asm/xics.h>
28 #include <asm/kvm_ppc.h>
30 struct icp_ipl {
31 union {
32 u32 word;
33 u8 bytes[4];
34 } xirr_poll;
35 union {
36 u32 word;
37 u8 bytes[4];
38 } xirr;
39 u32 dummy;
40 union {
41 u32 word;
42 u8 bytes[4];
43 } qirr;
44 u32 link_a;
45 u32 link_b;
46 u32 link_c;
49 static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
51 static inline unsigned int icp_native_get_xirr(void)
53 int cpu = smp_processor_id();
55 return in_be32(&icp_native_regs[cpu]->xirr.word);
58 static inline void icp_native_set_xirr(unsigned int value)
60 int cpu = smp_processor_id();
62 out_be32(&icp_native_regs[cpu]->xirr.word, value);
65 static inline void icp_native_set_cppr(u8 value)
67 int cpu = smp_processor_id();
69 out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
72 static inline void icp_native_set_qirr(int n_cpu, u8 value)
74 out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
77 static void icp_native_set_cpu_priority(unsigned char cppr)
79 xics_set_base_cppr(cppr);
80 icp_native_set_cppr(cppr);
81 iosync();
84 static void icp_native_eoi(struct irq_data *d)
86 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
88 iosync();
89 icp_native_set_xirr((xics_pop_cppr() << 24) | hw_irq);
92 static void icp_native_teardown_cpu(void)
94 int cpu = smp_processor_id();
96 /* Clear any pending IPI */
97 icp_native_set_qirr(cpu, 0xff);
100 static void icp_native_flush_ipi(void)
102 /* We take the ipi irq but and never return so we
103 * need to EOI the IPI, but want to leave our priority 0
105 * should we check all the other interrupts too?
106 * should we be flagging idle loop instead?
107 * or creating some task to be scheduled?
110 icp_native_set_xirr((0x00 << 24) | XICS_IPI);
113 static unsigned int icp_native_get_irq(void)
115 unsigned int xirr = icp_native_get_xirr();
116 unsigned int vec = xirr & 0x00ffffff;
117 unsigned int irq;
119 if (vec == XICS_IRQ_SPURIOUS)
120 return NO_IRQ;
122 irq = irq_find_mapping(xics_host, vec);
123 if (likely(irq != NO_IRQ)) {
124 xics_push_cppr(vec);
125 return irq;
128 /* We don't have a linux mapping, so have rtas mask it. */
129 xics_mask_unknown_vec(vec);
131 /* We might learn about it later, so EOI it */
132 icp_native_set_xirr(xirr);
134 return NO_IRQ;
137 #ifdef CONFIG_SMP
139 static void icp_native_cause_ipi(int cpu, unsigned long data)
141 icp_native_set_qirr(cpu, IPI_PRIORITY);
144 void xics_wake_cpu(int cpu)
146 icp_native_set_qirr(cpu, IPI_PRIORITY);
148 EXPORT_SYMBOL_GPL(xics_wake_cpu);
150 static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
152 int cpu = smp_processor_id();
154 icp_native_set_qirr(cpu, 0xff);
156 return smp_ipi_demux();
159 #endif /* CONFIG_SMP */
161 static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
162 unsigned long size)
164 char *rname;
165 int i, cpu = -1;
167 /* This may look gross but it's good enough for now, we don't quite
168 * have a hard -> linux processor id matching.
170 for_each_possible_cpu(i) {
171 if (!cpu_present(i))
172 continue;
173 if (hw_id == get_hard_smp_processor_id(i)) {
174 cpu = i;
175 break;
179 /* Fail, skip that CPU. Don't print, it's normal, some XICS come up
180 * with way more entries in there than you have CPUs
182 if (cpu == -1)
183 return 0;
185 rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
186 cpu, hw_id);
188 if (!request_mem_region(addr, size, rname)) {
189 pr_warning("icp_native: Could not reserve ICP MMIO"
190 " for CPU %d, interrupt server #0x%x\n",
191 cpu, hw_id);
192 return -EBUSY;
195 icp_native_regs[cpu] = ioremap(addr, size);
196 kvmppc_set_xics_phys(cpu, addr);
197 if (!icp_native_regs[cpu]) {
198 pr_warning("icp_native: Failed ioremap for CPU %d, "
199 "interrupt server #0x%x, addr %#lx\n",
200 cpu, hw_id, addr);
201 release_mem_region(addr, size);
202 return -ENOMEM;
204 return 0;
207 static int __init icp_native_init_one_node(struct device_node *np,
208 unsigned int *indx)
210 unsigned int ilen;
211 const u32 *ireg;
212 int i;
213 int reg_tuple_size;
214 int num_servers = 0;
216 /* This code does the theorically broken assumption that the interrupt
217 * server numbers are the same as the hard CPU numbers.
218 * This happens to be the case so far but we are playing with fire...
219 * should be fixed one of these days. -BenH.
221 ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);
223 /* Do that ever happen ? we'll know soon enough... but even good'old
224 * f80 does have that property ..
226 WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32)));
228 if (ireg) {
229 *indx = of_read_number(ireg, 1);
230 if (ilen >= 2*sizeof(u32))
231 num_servers = of_read_number(ireg + 1, 1);
234 ireg = of_get_property(np, "reg", &ilen);
235 if (!ireg) {
236 pr_err("icp_native: Can't find interrupt reg property");
237 return -1;
240 reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
241 if (((ilen % reg_tuple_size) != 0)
242 || (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
243 pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
244 ilen / reg_tuple_size, num_servers);
245 return -1;
248 for (i = 0; i < (ilen / reg_tuple_size); i++) {
249 struct resource r;
250 int err;
252 err = of_address_to_resource(np, i, &r);
253 if (err) {
254 pr_err("icp_native: Could not translate ICP MMIO"
255 " for interrupt server 0x%x (%d)\n", *indx, err);
256 return -1;
259 if (icp_native_map_one_cpu(*indx, r.start, resource_size(&r)))
260 return -1;
262 (*indx)++;
264 return 0;
267 static const struct icp_ops icp_native_ops = {
268 .get_irq = icp_native_get_irq,
269 .eoi = icp_native_eoi,
270 .set_priority = icp_native_set_cpu_priority,
271 .teardown_cpu = icp_native_teardown_cpu,
272 .flush_ipi = icp_native_flush_ipi,
273 #ifdef CONFIG_SMP
274 .ipi_action = icp_native_ipi_action,
275 .cause_ipi = icp_native_cause_ipi,
276 #endif
279 int __init icp_native_init(void)
281 struct device_node *np;
282 u32 indx = 0;
283 int found = 0;
285 for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
286 if (icp_native_init_one_node(np, &indx) == 0)
287 found = 1;
288 if (!found) {
289 for_each_node_by_type(np,
290 "PowerPC-External-Interrupt-Presentation") {
291 if (icp_native_init_one_node(np, &indx) == 0)
292 found = 1;
296 if (found == 0)
297 return -ENODEV;
299 icp_ops = &icp_native_ops;
301 return 0;