1
2
3
4
5
6
7#include <common.h>
8#include <dm.h>
9#include <errno.h>
10#include <fdtdec.h>
11#include <malloc.h>
12#include <asm/io.h>
13#include <asm/irq.h>
14#include <asm/pci.h>
15#include <asm/pirq_routing.h>
16#include <asm/tables.h>
17
18DECLARE_GLOBAL_DATA_PTR;
19
20static struct irq_routing_table *pirq_routing_table;
21
22bool pirq_check_irq_routed(struct udevice *dev, int link, u8 irq)
23{
24 struct irq_router *priv = dev_get_priv(dev);
25 u8 pirq;
26 int base = priv->link_base;
27
28 if (priv->config == PIRQ_VIA_PCI)
29 dm_pci_read_config8(dev->parent, LINK_N2V(link, base), &pirq);
30 else
31 pirq = readb(priv->ibase + LINK_N2V(link, base));
32
33 pirq &= 0xf;
34
35
36 if (pirq < 3 || pirq == 8 || pirq == 13)
37 return false;
38
39 return pirq == irq ? true : false;
40}
41
42int pirq_translate_link(struct udevice *dev, int link)
43{
44 struct irq_router *priv = dev_get_priv(dev);
45
46 return LINK_V2N(link, priv->link_base);
47}
48
49void pirq_assign_irq(struct udevice *dev, int link, u8 irq)
50{
51 struct irq_router *priv = dev_get_priv(dev);
52 int base = priv->link_base;
53
54
55 if (irq < 3 || irq == 8 || irq == 13)
56 return;
57
58 if (priv->config == PIRQ_VIA_PCI)
59 dm_pci_write_config8(dev->parent, LINK_N2V(link, base), irq);
60 else
61 writeb(irq, priv->ibase + LINK_N2V(link, base));
62}
63
64static struct irq_info *check_dup_entry(struct irq_info *slot_base,
65 int entry_num, int bus, int device)
66{
67 struct irq_info *slot = slot_base;
68 int i;
69
70 for (i = 0; i < entry_num; i++) {
71 if (slot->bus == bus && slot->devfn == (device << 3))
72 break;
73 slot++;
74 }
75
76 return (i == entry_num) ? NULL : slot;
77}
78
79static inline void fill_irq_info(struct irq_router *priv, struct irq_info *slot,
80 int bus, int device, int pin, int pirq)
81{
82 slot->bus = bus;
83 slot->devfn = (device << 3) | 0;
84 slot->irq[pin - 1].link = LINK_N2V(pirq, priv->link_base);
85 slot->irq[pin - 1].bitmap = priv->irq_mask;
86}
87
88static int create_pirq_routing_table(struct udevice *dev)
89{
90 struct irq_router *priv = dev_get_priv(dev);
91 const void *blob = gd->fdt_blob;
92 int node;
93 int len, count;
94 const u32 *cell;
95 struct irq_routing_table *rt;
96 struct irq_info *slot, *slot_base;
97 int irq_entries = 0;
98 int i;
99 int ret;
100
101 node = dev->of_offset;
102
103
104 priv->bdf = dm_pci_get_bdf(dev->parent);
105
106 ret = fdt_stringlist_search(blob, node, "intel,pirq-config", "pci");
107 if (!ret) {
108 priv->config = PIRQ_VIA_PCI;
109 } else {
110 ret = fdt_stringlist_search(blob, node, "intel,pirq-config",
111 "ibase");
112 if (!ret)
113 priv->config = PIRQ_VIA_IBASE;
114 else
115 return -EINVAL;
116 }
117
118 ret = fdtdec_get_int(blob, node, "intel,pirq-link", -1);
119 if (ret == -1)
120 return ret;
121 priv->link_base = ret;
122
123 priv->irq_mask = fdtdec_get_int(blob, node,
124 "intel,pirq-mask", PIRQ_BITMAP);
125
126 if (IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE)) {
127
128 priv->irq_mask &= ~(1 << 9);
129 }
130
131 if (priv->config == PIRQ_VIA_IBASE) {
132 int ibase_off;
133
134 ibase_off = fdtdec_get_int(blob, node, "intel,ibase-offset", 0);
135 if (!ibase_off)
136 return -EINVAL;
137
138
139
140
141
142
143
144
145
146
147
148 dm_pci_read_config32(dev->parent, ibase_off, &priv->ibase);
149 priv->ibase &= ~0xf;
150 }
151
152 priv->actl_8bit = fdtdec_get_bool(blob, node, "intel,actl-8bit");
153 priv->actl_addr = fdtdec_get_int(blob, node, "intel,actl-addr", 0);
154
155 cell = fdt_getprop(blob, node, "intel,pirq-routing", &len);
156 if (!cell || len % sizeof(struct pirq_routing))
157 return -EINVAL;
158 count = len / sizeof(struct pirq_routing);
159
160 rt = calloc(1, sizeof(struct irq_routing_table));
161 if (!rt)
162 return -ENOMEM;
163
164
165 rt->signature = PIRQ_SIGNATURE;
166 rt->version = PIRQ_VERSION;
167 rt->rtr_bus = PCI_BUS(priv->bdf);
168 rt->rtr_devfn = (PCI_DEV(priv->bdf) << 3) | PCI_FUNC(priv->bdf);
169 rt->rtr_vendor = PCI_VENDOR_ID_INTEL;
170 rt->rtr_device = PCI_DEVICE_ID_INTEL_ICH7_31;
171
172 slot_base = rt->slots;
173
174
175 for (i = 0; i < count;
176 i++, cell += sizeof(struct pirq_routing) / sizeof(u32)) {
177 struct pirq_routing pr;
178
179 pr.bdf = fdt_addr_to_cpu(cell[0]);
180 pr.pin = fdt_addr_to_cpu(cell[1]);
181 pr.pirq = fdt_addr_to_cpu(cell[2]);
182
183 debug("irq_info %d: b.d.f %x.%x.%x INT%c PIRQ%c\n",
184 i, PCI_BUS(pr.bdf), PCI_DEV(pr.bdf),
185 PCI_FUNC(pr.bdf), 'A' + pr.pin - 1,
186 'A' + pr.pirq);
187
188 slot = check_dup_entry(slot_base, irq_entries,
189 PCI_BUS(pr.bdf), PCI_DEV(pr.bdf));
190 if (slot) {
191 debug("found entry for bus %d device %d, ",
192 PCI_BUS(pr.bdf), PCI_DEV(pr.bdf));
193
194 if (slot->irq[pr.pin - 1].link) {
195 debug("skipping\n");
196
197
198
199
200
201
202
203
204 if (slot->irq[pr.pin - 1].link !=
205 LINK_N2V(pr.pirq, priv->link_base))
206 debug("WARNING: Inconsistent PIRQ routing information\n");
207 continue;
208 }
209 } else {
210 slot = slot_base + irq_entries++;
211 }
212 debug("writing INT%c\n", 'A' + pr.pin - 1);
213 fill_irq_info(priv, slot, PCI_BUS(pr.bdf), PCI_DEV(pr.bdf),
214 pr.pin, pr.pirq);
215 }
216
217 rt->size = irq_entries * sizeof(struct irq_info) + 32;
218
219
220 rt->checksum = table_compute_checksum(rt, rt->size);
221
222 pirq_routing_table = rt;
223
224 return 0;
225}
226
227static void irq_enable_sci(struct udevice *dev)
228{
229 struct irq_router *priv = dev_get_priv(dev);
230
231 if (priv->actl_8bit) {
232
233 dm_pci_write_config8(dev->parent, priv->actl_addr, 0x80);
234 } else {
235
236 if (priv->config == PIRQ_VIA_PCI)
237 dm_pci_write_config32(dev->parent, priv->actl_addr, 0);
238 else
239 writel(0, priv->ibase + priv->actl_addr);
240 }
241}
242
243int irq_router_common_init(struct udevice *dev)
244{
245 int ret;
246
247 ret = create_pirq_routing_table(dev);
248 if (ret) {
249 debug("Failed to create pirq routing table\n");
250 return ret;
251 }
252
253 pirq_route_irqs(dev, pirq_routing_table->slots,
254 get_irq_slot_count(pirq_routing_table));
255
256 if (IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE))
257 irq_enable_sci(dev);
258
259 return 0;
260}
261
262int irq_router_probe(struct udevice *dev)
263{
264 return irq_router_common_init(dev);
265}
266
267u32 write_pirq_routing_table(u32 addr)
268{
269 if (!pirq_routing_table)
270 return addr;
271
272 return copy_pirq_routing_table(addr, pirq_routing_table);
273}
274
275static const struct udevice_id irq_router_ids[] = {
276 { .compatible = "intel,irq-router" },
277 { }
278};
279
280U_BOOT_DRIVER(irq_router_drv) = {
281 .name = "intel_irq",
282 .id = UCLASS_IRQ,
283 .of_match = irq_router_ids,
284 .probe = irq_router_probe,
285 .priv_auto_alloc_size = sizeof(struct irq_router),
286};
287
288UCLASS_DRIVER(irq) = {
289 .id = UCLASS_IRQ,
290 .name = "irq",
291};
292