tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2015, 2016 Cavium, Inc.
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/ioport.h>
12#include <linux/of_pci.h>
13#include <linux/of.h>
14#include <linux/pci-ecam.h>
15#include <linux/platform_device.h>
16
17#if defined(CONFIG_PCI_HOST_THUNDER_ECAM) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
18
19static void set_val(u32 v, int where, int size, u32 *val)
20{
21 int shift = (where & 3) * 8;
22
23 pr_debug("set_val %04x: %08x\n", (unsigned)(where & ~3), v);
24 v >>= shift;
25 if (size == 1)
26 v &= 0xff;
27 else if (size == 2)
28 v &= 0xffff;
29 *val = v;
30}
31
32static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
33 unsigned int devfn, int where, int size, u32 *val)
34{
35 void __iomem *addr;
36 u32 v;
37
38 /* Entries are 16-byte aligned; bits[2,3] select word in entry */
39 int where_a = where & 0xc;
40
41 if (where_a == 0) {
42 set_val(e0, where, size, val);
43 return PCIBIOS_SUCCESSFUL;
44 }
45 if (where_a == 0x4) {
46 addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
47 if (!addr) {
48 *val = ~0;
49 return PCIBIOS_DEVICE_NOT_FOUND;
50 }
51 v = readl(addr);
52 v &= ~0xf;
53 v |= 2; /* EA entry-1. Base-L */
54 set_val(v, where, size, val);
55 return PCIBIOS_SUCCESSFUL;
56 }
57 if (where_a == 0x8) {
58 u32 barl_orig;
59 u32 barl_rb;
60
61 addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
62 if (!addr) {
63 *val = ~0;
64 return PCIBIOS_DEVICE_NOT_FOUND;
65 }
66 barl_orig = readl(addr + 0);
67 writel(0xffffffff, addr + 0);
68 barl_rb = readl(addr + 0);
69 writel(barl_orig, addr + 0);
70 /* zeros in unsettable bits */
71 v = ~barl_rb & ~3;
72 v |= 0xc; /* EA entry-2. Offset-L */
73 set_val(v, where, size, val);
74 return PCIBIOS_SUCCESSFUL;
75 }
76 if (where_a == 0xc) {
77 addr = bus->ops->map_bus(bus, devfn, bar + 4); /* BAR 1 */
78 if (!addr) {
79 *val = ~0;
80 return PCIBIOS_DEVICE_NOT_FOUND;
81 }
82 v = readl(addr); /* EA entry-3. Base-H */
83 set_val(v, where, size, val);
84 return PCIBIOS_SUCCESSFUL;
85 }
86 return PCIBIOS_DEVICE_NOT_FOUND;
87}
88
89static int thunder_ecam_p2_config_read(struct pci_bus *bus, unsigned int devfn,
90 int where, int size, u32 *val)
91{
92 struct pci_config_window *cfg = bus->sysdata;
93 int where_a = where & ~3;
94 void __iomem *addr;
95 u32 node_bits;
96 u32 v;
97
98 /* EA Base[63:32] may be missing some bits ... */
99 switch (where_a) {
100 case 0xa8:
101 case 0xbc:
102 case 0xd0:
103 case 0xe4:
104 break;
105 default:
106 return pci_generic_config_read(bus, devfn, where, size, val);
107 }
108
109 addr = bus->ops->map_bus(bus, devfn, where_a);
110 if (!addr) {
111 *val = ~0;
112 return PCIBIOS_DEVICE_NOT_FOUND;
113 }
114
115 v = readl(addr);
116
117 /*
118 * Bit 44 of the 64-bit Base must match the same bit in
119 * the config space access window. Since we are working with
120 * the high-order 32 bits, shift everything down by 32 bits.
121 */
122 node_bits = (cfg->res.start >> 32) & (1 << 12);
123
124 v |= node_bits;
125 set_val(v, where, size, val);
126
127 return PCIBIOS_SUCCESSFUL;
128}
129
130static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
131 int where, int size, u32 *val)
132{
133 u32 v;
134 u32 vendor_device;
135 u32 class_rev;
136 void __iomem *addr;
137 int cfg_type;
138 int where_a = where & ~3;
139
140 addr = bus->ops->map_bus(bus, devfn, 0xc);
141 if (!addr) {
142 *val = ~0;
143 return PCIBIOS_DEVICE_NOT_FOUND;
144 }
145
146 v = readl(addr);
147
148 /* Check for non type-00 header */
149 cfg_type = (v >> 16) & 0x7f;
150
151 addr = bus->ops->map_bus(bus, devfn, 8);
152 if (!addr) {
153 *val = ~0;
154 return PCIBIOS_DEVICE_NOT_FOUND;
155 }
156
157 class_rev = readl(addr);
158 if (class_rev == 0xffffffff)
159 goto no_emulation;
160
161 if ((class_rev & 0xff) >= 8) {
162 /* Pass-2 handling */
163 if (cfg_type)
164 goto no_emulation;
165 return thunder_ecam_p2_config_read(bus, devfn, where,
166 size, val);
167 }
168
169 /*
170 * All BARs have fixed addresses specified by the EA
171 * capability; they must return zero on read.
172 */
173 if (cfg_type == 0 &&
174 ((where >= 0x10 && where < 0x2c) ||
175 (where >= 0x1a4 && where < 0x1bc))) {
176 /* BAR or SR-IOV BAR */
177 *val = 0;
178 return PCIBIOS_SUCCESSFUL;
179 }
180
181 addr = bus->ops->map_bus(bus, devfn, 0);
182 if (!addr) {
183 *val = ~0;
184 return PCIBIOS_DEVICE_NOT_FOUND;
185 }
186
187 vendor_device = readl(addr);
188 if (vendor_device == 0xffffffff)
189 goto no_emulation;
190
191 pr_debug("%04x:%04x - Fix pass#: %08x, where: %03x, devfn: %03x\n",
192 vendor_device & 0xffff, vendor_device >> 16, class_rev,
193 (unsigned) where, devfn);
194
195 /* Check for non type-00 header */
196 if (cfg_type == 0) {
197 bool has_msix;
198 bool is_nic = (vendor_device == 0xa01e177d);
199 bool is_tns = (vendor_device == 0xa01f177d);
200
201 addr = bus->ops->map_bus(bus, devfn, 0x70);
202 if (!addr) {
203 *val = ~0;
204 return PCIBIOS_DEVICE_NOT_FOUND;
205 }
206 /* E_CAP */
207 v = readl(addr);
208 has_msix = (v & 0xff00) != 0;
209
210 if (!has_msix && where_a == 0x70) {
211 v |= 0xbc00; /* next capability is EA at 0xbc */
212 set_val(v, where, size, val);
213 return PCIBIOS_SUCCESSFUL;
214 }
215 if (where_a == 0xb0) {
216 addr = bus->ops->map_bus(bus, devfn, where_a);
217 if (!addr) {
218 *val = ~0;
219 return PCIBIOS_DEVICE_NOT_FOUND;
220 }
221 v = readl(addr);
222 if (v & 0xff00)
223 pr_err("Bad MSIX cap header: %08x\n", v);
224 v |= 0xbc00; /* next capability is EA at 0xbc */
225 set_val(v, where, size, val);
226 return PCIBIOS_SUCCESSFUL;
227 }
228 if (where_a == 0xbc) {
229 if (is_nic)
230 v = 0x40014; /* EA last in chain, 4 entries */
231 else if (is_tns)
232 v = 0x30014; /* EA last in chain, 3 entries */
233 else if (has_msix)
234 v = 0x20014; /* EA last in chain, 2 entries */
235 else
236 v = 0x10014; /* EA last in chain, 1 entry */
237 set_val(v, where, size, val);
238 return PCIBIOS_SUCCESSFUL;
239 }
240 if (where_a >= 0xc0 && where_a < 0xd0)
241 /* EA entry-0. PP=0, BAR0 Size:3 */
242 return handle_ea_bar(0x80ff0003,
243 0x10, bus, devfn, where,
244 size, val);
245 if (where_a >= 0xd0 && where_a < 0xe0 && has_msix)
246 /* EA entry-1. PP=0, BAR4 Size:3 */
247 return handle_ea_bar(0x80ff0043,
248 0x20, bus, devfn, where,
249 size, val);
250 if (where_a >= 0xe0 && where_a < 0xf0 && is_tns)
251 /* EA entry-2. PP=0, BAR2, Size:3 */
252 return handle_ea_bar(0x80ff0023,
253 0x18, bus, devfn, where,
254 size, val);
255 if (where_a >= 0xe0 && where_a < 0xf0 && is_nic)
256 /* EA entry-2. PP=4, VF_BAR0 (9), Size:3 */
257 return handle_ea_bar(0x80ff0493,
258 0x1a4, bus, devfn, where,
259 size, val);
260 if (where_a >= 0xf0 && where_a < 0x100 && is_nic)
261 /* EA entry-3. PP=4, VF_BAR4 (d), Size:3 */
262 return handle_ea_bar(0x80ff04d3,
263 0x1b4, bus, devfn, where,
264 size, val);
265 } else if (cfg_type == 1) {
266 bool is_rsl_bridge = devfn == 0x08;
267 bool is_rad_bridge = devfn == 0xa0;
268 bool is_zip_bridge = devfn == 0xa8;
269 bool is_dfa_bridge = devfn == 0xb0;
270 bool is_nic_bridge = devfn == 0x10;
271
272 if (where_a == 0x70) {
273 addr = bus->ops->map_bus(bus, devfn, where_a);
274 if (!addr) {
275 *val = ~0;
276 return PCIBIOS_DEVICE_NOT_FOUND;
277 }
278 v = readl(addr);
279 if (v & 0xff00)
280 pr_err("Bad PCIe cap header: %08x\n", v);
281 v |= 0xbc00; /* next capability is EA at 0xbc */
282 set_val(v, where, size, val);
283 return PCIBIOS_SUCCESSFUL;
284 }
285 if (where_a == 0xbc) {
286 if (is_nic_bridge)
287 v = 0x10014; /* EA last in chain, 1 entry */
288 else
289 v = 0x00014; /* EA last in chain, no entries */
290 set_val(v, where, size, val);
291 return PCIBIOS_SUCCESSFUL;
292 }
293 if (where_a == 0xc0) {
294 if (is_rsl_bridge || is_nic_bridge)
295 v = 0x0101; /* subordinate:secondary = 1:1 */
296 else if (is_rad_bridge)
297 v = 0x0202; /* subordinate:secondary = 2:2 */
298 else if (is_zip_bridge)
299 v = 0x0303; /* subordinate:secondary = 3:3 */
300 else if (is_dfa_bridge)
301 v = 0x0404; /* subordinate:secondary = 4:4 */
302 set_val(v, where, size, val);
303 return PCIBIOS_SUCCESSFUL;
304 }
305 if (where_a == 0xc4 && is_nic_bridge) {
306 /* Enabled, not-Write, SP=ff, PP=05, BEI=6, ES=4 */
307 v = 0x80ff0564;
308 set_val(v, where, size, val);
309 return PCIBIOS_SUCCESSFUL;
310 }
311 if (where_a == 0xc8 && is_nic_bridge) {
312 v = 0x00000002; /* Base-L 64-bit */
313 set_val(v, where, size, val);
314 return PCIBIOS_SUCCESSFUL;
315 }
316 if (where_a == 0xcc && is_nic_bridge) {
317 v = 0xfffffffe; /* MaxOffset-L 64-bit */
318 set_val(v, where, size, val);
319 return PCIBIOS_SUCCESSFUL;
320 }
321 if (where_a == 0xd0 && is_nic_bridge) {
322 v = 0x00008430; /* NIC Base-H */
323 set_val(v, where, size, val);
324 return PCIBIOS_SUCCESSFUL;
325 }
326 if (where_a == 0xd4 && is_nic_bridge) {
327 v = 0x0000000f; /* MaxOffset-H */
328 set_val(v, where, size, val);
329 return PCIBIOS_SUCCESSFUL;
330 }
331 }
332no_emulation:
333 return pci_generic_config_read(bus, devfn, where, size, val);
334}
335
336static int thunder_ecam_config_write(struct pci_bus *bus, unsigned int devfn,
337 int where, int size, u32 val)
338{
339 /*
340 * All BARs have fixed addresses; ignore BAR writes so they
341 * don't get corrupted.
342 */
343 if ((where >= 0x10 && where < 0x2c) ||
344 (where >= 0x1a4 && where < 0x1bc))
345 /* BAR or SR-IOV BAR */
346 return PCIBIOS_SUCCESSFUL;
347
348 return pci_generic_config_write(bus, devfn, where, size, val);
349}
350
351struct pci_ecam_ops pci_thunder_ecam_ops = {
352 .bus_shift = 20,
353 .pci_ops = {
354 .map_bus = pci_ecam_map_bus,
355 .read = thunder_ecam_config_read,
356 .write = thunder_ecam_config_write,
357 }
358};
359
360#ifdef CONFIG_PCI_HOST_THUNDER_ECAM
361
362static const struct of_device_id thunder_ecam_of_match[] = {
363 { .compatible = "cavium,pci-host-thunder-ecam" },
364 { },
365};
366
367static int thunder_ecam_probe(struct platform_device *pdev)
368{
369 return pci_host_common_probe(pdev, &pci_thunder_ecam_ops);
370}
371
372static struct platform_driver thunder_ecam_driver = {
373 .driver = {
374 .name = KBUILD_MODNAME,
375 .of_match_table = thunder_ecam_of_match,
376 },
377 .probe = thunder_ecam_probe,
378};
379builtin_platform_driver(thunder_ecam_driver);
380
381#endif
382#endif