tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * ipmi_si_platform.c
4 *
5 * Handling for platform devices in IPMI (ACPI, OF, and things
6 * coming from the platform.
7 */
8#include <linux/types.h>
9#include <linux/module.h>
10#include <linux/of_device.h>
11#include <linux/of_platform.h>
12#include <linux/of_address.h>
13#include <linux/of_irq.h>
14#include <linux/acpi.h>
15#include "ipmi_si.h"
16#include "ipmi_dmi.h"
17
18#define PFX "ipmi_platform: "
19
20static bool si_tryplatform = true;
21#ifdef CONFIG_ACPI
22static bool si_tryacpi = true;
23#endif
24#ifdef CONFIG_OF
25static bool si_tryopenfirmware = true;
26#endif
27#ifdef CONFIG_DMI
28static bool si_trydmi = true;
29#else
30static bool si_trydmi = false;
31#endif
32
33module_param_named(tryplatform, si_tryplatform, bool, 0);
34MODULE_PARM_DESC(tryplatform, "Setting this to zero will disable the"
35 " default scan of the interfaces identified via platform"
36 " interfaces besides ACPI, OpenFirmware, and DMI");
37#ifdef CONFIG_ACPI
38module_param_named(tryacpi, si_tryacpi, bool, 0);
39MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
40 " default scan of the interfaces identified via ACPI");
41#endif
42#ifdef CONFIG_OF
43module_param_named(tryopenfirmware, si_tryopenfirmware, bool, 0);
44MODULE_PARM_DESC(tryopenfirmware, "Setting this to zero will disable the"
45 " default scan of the interfaces identified via OpenFirmware");
46#endif
47#ifdef CONFIG_DMI
48module_param_named(trydmi, si_trydmi, bool, 0);
49MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
50 " default scan of the interfaces identified via DMI");
51#endif
52
53#ifdef CONFIG_ACPI
54/* For GPE-type interrupts. */
55static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
56 u32 gpe_number, void *context)
57{
58 struct si_sm_io *io = context;
59
60 ipmi_si_irq_handler(io->irq, io->irq_handler_data);
61 return ACPI_INTERRUPT_HANDLED;
62}
63
64static void acpi_gpe_irq_cleanup(struct si_sm_io *io)
65{
66 if (!io->irq)
67 return;
68
69 ipmi_irq_start_cleanup(io);
70 acpi_remove_gpe_handler(NULL, io->irq, &ipmi_acpi_gpe);
71}
72
73static int acpi_gpe_irq_setup(struct si_sm_io *io)
74{
75 acpi_status status;
76
77 if (!io->irq)
78 return 0;
79
80 status = acpi_install_gpe_handler(NULL,
81 io->irq,
82 ACPI_GPE_LEVEL_TRIGGERED,
83 &ipmi_acpi_gpe,
84 io);
85 if (status != AE_OK) {
86 dev_warn(io->dev,
87 "Unable to claim ACPI GPE %d, running polled\n",
88 io->irq);
89 io->irq = 0;
90 return -EINVAL;
91 } else {
92 io->irq_cleanup = acpi_gpe_irq_cleanup;
93 ipmi_irq_finish_setup(io);
94 dev_info(io->dev, "Using ACPI GPE %d\n", io->irq);
95 return 0;
96 }
97}
98#endif
99
100static struct resource *
101ipmi_get_info_from_resources(struct platform_device *pdev,
102 struct si_sm_io *io)
103{
104 struct resource *res, *res_second;
105
106 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
107 if (res) {
108 io->addr_type = IPMI_IO_ADDR_SPACE;
109 } else {
110 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
111 if (res)
112 io->addr_type = IPMI_MEM_ADDR_SPACE;
113 }
114 if (!res) {
115 dev_err(&pdev->dev, "no I/O or memory address\n");
116 return NULL;
117 }
118 io->addr_data = res->start;
119
120 io->regspacing = DEFAULT_REGSPACING;
121 res_second = platform_get_resource(pdev,
122 (io->addr_type == IPMI_IO_ADDR_SPACE) ?
123 IORESOURCE_IO : IORESOURCE_MEM,
124 1);
125 if (res_second) {
126 if (res_second->start > io->addr_data)
127 io->regspacing = res_second->start - io->addr_data;
128 }
129 io->regsize = DEFAULT_REGSIZE;
130 io->regshift = 0;
131
132 return res;
133}
134
135static int platform_ipmi_probe(struct platform_device *pdev)
136{
137 struct si_sm_io io;
138 u8 type, slave_addr, addr_source;
139 int rv;
140
141 rv = device_property_read_u8(&pdev->dev, "addr-source", &addr_source);
142 if (rv)
143 addr_source = SI_PLATFORM;
144 if (addr_source >= SI_LAST)
145 return -EINVAL;
146
147 if (addr_source == SI_SMBIOS) {
148 if (!si_trydmi)
149 return -ENODEV;
150 } else {
151 if (!si_tryplatform)
152 return -ENODEV;
153 }
154
155 rv = device_property_read_u8(&pdev->dev, "ipmi-type", &type);
156 if (rv)
157 return -ENODEV;
158
159 memset(&io, 0, sizeof(io));
160 io.addr_source = addr_source;
161 dev_info(&pdev->dev, PFX "probing via %s\n",
162 ipmi_addr_src_to_str(addr_source));
163
164 switch (type) {
165 case SI_KCS:
166 case SI_SMIC:
167 case SI_BT:
168 io.si_type = type;
169 break;
170 default:
171 dev_err(&pdev->dev, "ipmi-type property is invalid\n");
172 return -EINVAL;
173 }
174
175 if (!ipmi_get_info_from_resources(pdev, &io))
176 return -EINVAL;
177
178 rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
179 if (rv) {
180 dev_warn(&pdev->dev, "device has no slave-addr property\n");
181 io.slave_addr = 0x20;
182 } else {
183 io.slave_addr = slave_addr;
184 }
185
186 io.irq = platform_get_irq(pdev, 0);
187 if (io.irq > 0)
188 io.irq_setup = ipmi_std_irq_setup;
189 else
190 io.irq = 0;
191
192 io.dev = &pdev->dev;
193
194 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
195 (io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
196 io.addr_data, io.regsize, io.regspacing, io.irq);
197
198 ipmi_si_add_smi(&io);
199
200 return 0;
201}
202
203#ifdef CONFIG_OF
204static const struct of_device_id of_ipmi_match[] = {
205 { .type = "ipmi", .compatible = "ipmi-kcs",
206 .data = (void *)(unsigned long) SI_KCS },
207 { .type = "ipmi", .compatible = "ipmi-smic",
208 .data = (void *)(unsigned long) SI_SMIC },
209 { .type = "ipmi", .compatible = "ipmi-bt",
210 .data = (void *)(unsigned long) SI_BT },
211 {},
212};
213MODULE_DEVICE_TABLE(of, of_ipmi_match);
214
215static int of_ipmi_probe(struct platform_device *pdev)
216{
217 const struct of_device_id *match;
218 struct si_sm_io io;
219 struct resource resource;
220 const __be32 *regsize, *regspacing, *regshift;
221 struct device_node *np = pdev->dev.of_node;
222 int ret;
223 int proplen;
224
225 if (!si_tryopenfirmware)
226 return -ENODEV;
227
228 dev_info(&pdev->dev, "probing via device tree\n");
229
230 match = of_match_device(of_ipmi_match, &pdev->dev);
231 if (!match)
232 return -ENODEV;
233
234 if (!of_device_is_available(np))
235 return -EINVAL;
236
237 ret = of_address_to_resource(np, 0, &resource);
238 if (ret) {
239 dev_warn(&pdev->dev, PFX "invalid address from OF\n");
240 return ret;
241 }
242
243 regsize = of_get_property(np, "reg-size", &proplen);
244 if (regsize && proplen != 4) {
245 dev_warn(&pdev->dev, PFX "invalid regsize from OF\n");
246 return -EINVAL;
247 }
248
249 regspacing = of_get_property(np, "reg-spacing", &proplen);
250 if (regspacing && proplen != 4) {
251 dev_warn(&pdev->dev, PFX "invalid regspacing from OF\n");
252 return -EINVAL;
253 }
254
255 regshift = of_get_property(np, "reg-shift", &proplen);
256 if (regshift && proplen != 4) {
257 dev_warn(&pdev->dev, PFX "invalid regshift from OF\n");
258 return -EINVAL;
259 }
260
261 memset(&io, 0, sizeof(io));
262 io.si_type = (enum si_type) match->data;
263 io.addr_source = SI_DEVICETREE;
264 io.irq_setup = ipmi_std_irq_setup;
265
266 if (resource.flags & IORESOURCE_IO)
267 io.addr_type = IPMI_IO_ADDR_SPACE;
268 else
269 io.addr_type = IPMI_MEM_ADDR_SPACE;
270
271 io.addr_data = resource.start;
272
273 io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
274 io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
275 io.regshift = regshift ? be32_to_cpup(regshift) : 0;
276
277 io.irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
278 io.dev = &pdev->dev;
279
280 dev_dbg(&pdev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
281 io.addr_data, io.regsize, io.regspacing, io.irq);
282
283 return ipmi_si_add_smi(&io);
284}
285#else
286#define of_ipmi_match NULL
287static int of_ipmi_probe(struct platform_device *dev)
288{
289 return -ENODEV;
290}
291#endif
292
293#ifdef CONFIG_ACPI
294static int find_slave_address(struct si_sm_io *io, int slave_addr)
295{
296#ifdef CONFIG_IPMI_DMI_DECODE
297 if (!slave_addr) {
298 u32 flags = IORESOURCE_IO;
299
300 if (io->addr_type == IPMI_MEM_ADDR_SPACE)
301 flags = IORESOURCE_MEM;
302
303 slave_addr = ipmi_dmi_get_slave_addr(io->si_type, flags,
304 io->addr_data);
305 }
306#endif
307
308 return slave_addr;
309}
310
311static int acpi_ipmi_probe(struct platform_device *pdev)
312{
313 struct si_sm_io io;
314 acpi_handle handle;
315 acpi_status status;
316 unsigned long long tmp;
317 struct resource *res;
318 int rv = -EINVAL;
319
320 if (!si_tryacpi)
321 return -ENODEV;
322
323 handle = ACPI_HANDLE(&pdev->dev);
324 if (!handle)
325 return -ENODEV;
326
327 memset(&io, 0, sizeof(io));
328 io.addr_source = SI_ACPI;
329 dev_info(&pdev->dev, PFX "probing via ACPI\n");
330
331 io.addr_info.acpi_info.acpi_handle = handle;
332
333 /* _IFT tells us the interface type: KCS, BT, etc */
334 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
335 if (ACPI_FAILURE(status)) {
336 dev_err(&pdev->dev,
337 "Could not find ACPI IPMI interface type\n");
338 goto err_free;
339 }
340
341 switch (tmp) {
342 case 1:
343 io.si_type = SI_KCS;
344 break;
345 case 2:
346 io.si_type = SI_SMIC;
347 break;
348 case 3:
349 io.si_type = SI_BT;
350 break;
351 case 4: /* SSIF, just ignore */
352 rv = -ENODEV;
353 goto err_free;
354 default:
355 dev_info(&pdev->dev, "unknown IPMI type %lld\n", tmp);
356 goto err_free;
357 }
358
359 res = ipmi_get_info_from_resources(pdev, &io);
360 if (!res) {
361 rv = -EINVAL;
362 goto err_free;
363 }
364
365 /* If _GPE exists, use it; otherwise use standard interrupts */
366 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
367 if (ACPI_SUCCESS(status)) {
368 io.irq = tmp;
369 io.irq_setup = acpi_gpe_irq_setup;
370 } else {
371 int irq = platform_get_irq(pdev, 0);
372
373 if (irq > 0) {
374 io.irq = irq;
375 io.irq_setup = ipmi_std_irq_setup;
376 }
377 }
378
379 io.slave_addr = find_slave_address(&io, io.slave_addr);
380
381 io.dev = &pdev->dev;
382
383 dev_info(io.dev, "%pR regsize %d spacing %d irq %d\n",
384 res, io.regsize, io.regspacing, io.irq);
385
386 return ipmi_si_add_smi(&io);
387
388err_free:
389 return rv;
390}
391
392static const struct acpi_device_id acpi_ipmi_match[] = {
393 { "IPI0001", 0 },
394 { },
395};
396MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match);
397#else
398static int acpi_ipmi_probe(struct platform_device *dev)
399{
400 return -ENODEV;
401}
402#endif
403
404static int ipmi_probe(struct platform_device *pdev)
405{
406 if (pdev->dev.of_node && of_ipmi_probe(pdev) == 0)
407 return 0;
408
409 if (acpi_ipmi_probe(pdev) == 0)
410 return 0;
411
412 return platform_ipmi_probe(pdev);
413}
414
415static int ipmi_remove(struct platform_device *pdev)
416{
417 return ipmi_si_remove_by_dev(&pdev->dev);
418}
419
420struct platform_driver ipmi_platform_driver = {
421 .driver = {
422 .name = DEVICE_NAME,
423 .of_match_table = of_ipmi_match,
424 .acpi_match_table = ACPI_PTR(acpi_ipmi_match),
425 },
426 .probe = ipmi_probe,
427 .remove = ipmi_remove,
428};
429
430void ipmi_si_platform_init(void)
431{
432 int rv = platform_driver_register(&ipmi_platform_driver);
433 if (rv)
434 pr_err(PFX "Unable to register driver: %d\n", rv);
435}
436
437void ipmi_si_platform_shutdown(void)
438{
439 platform_driver_unregister(&ipmi_platform_driver);
440}