1 /*
2 * intel_pmc_ipc.c: Driver for the Intel PMC IPC mechanism
3 *
4 * (C) Copyright 2014-2015 Intel Corporation
5 *
6 * This driver is based on Intel SCU IPC driver(intel_scu_opc.c) by
7 * Sreedhara DS <sreedhara.ds@intel.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; version 2
12 * of the License.
13 *
14 * PMC running in ARC processor communicates with other entity running in IA
15 * core through IPC mechanism which in turn messaging between IA core ad PMC.
16 */
17
18 #include <linux/module.h>
19 #include <linux/delay.h>
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/device.h>
23 #include <linux/pm.h>
24 #include <linux/pci.h>
25 #include <linux/platform_device.h>
26 #include <linux/interrupt.h>
27 #include <linux/pm_qos.h>
28 #include <linux/kernel.h>
29 #include <linux/bitops.h>
30 #include <linux/sched.h>
31 #include <linux/atomic.h>
32 #include <linux/notifier.h>
33 #include <linux/suspend.h>
34 #include <linux/acpi.h>
35 #include <asm/intel_pmc_ipc.h>
36 #include <linux/platform_data/itco_wdt.h>
37
38 /*
39 * IPC registers
40 * The IA write to IPC_CMD command register triggers an interrupt to the ARC,
41 * The ARC handles the interrupt and services it, writing optional data to
42 * the IPC1 registers, updates the IPC_STS response register with the status.
43 */
44 #define IPC_CMD 0x0
45 #define IPC_CMD_MSI 0x100
46 #define IPC_CMD_SIZE 16
47 #define IPC_CMD_SUBCMD 12
48 #define IPC_STATUS 0x04
49 #define IPC_STATUS_IRQ 0x4
50 #define IPC_STATUS_ERR 0x2
51 #define IPC_STATUS_BUSY 0x1
52 #define IPC_SPTR 0x08
53 #define IPC_DPTR 0x0C
54 #define IPC_WRITE_BUFFER 0x80
55 #define IPC_READ_BUFFER 0x90
56
57 /*
58 * 16-byte buffer for sending data associated with IPC command.
59 */
60 #define IPC_DATA_BUFFER_SIZE 16
61
62 #define IPC_LOOP_CNT 3000000
63 #define IPC_MAX_SEC 3
64
65 #define IPC_TRIGGER_MODE_IRQ true
66
67 /* exported resources from IFWI */
68 #define PLAT_RESOURCE_IPC_INDEX 0
69 #define PLAT_RESOURCE_IPC_SIZE 0x1000
70 #define PLAT_RESOURCE_GCR_OFFSET 0x1008
71 #define PLAT_RESOURCE_GCR_SIZE 0x4
72 #define PLAT_RESOURCE_BIOS_DATA_INDEX 1
73 #define PLAT_RESOURCE_BIOS_IFACE_INDEX 2
74 #define PLAT_RESOURCE_TELEM_SSRAM_INDEX 3
75 #define PLAT_RESOURCE_ISP_DATA_INDEX 4
76 #define PLAT_RESOURCE_ISP_IFACE_INDEX 5
77 #define PLAT_RESOURCE_GTD_DATA_INDEX 6
78 #define PLAT_RESOURCE_GTD_IFACE_INDEX 7
79 #define PLAT_RESOURCE_ACPI_IO_INDEX 0
80
81 /*
82 * BIOS does not create an ACPI device for each PMC function,
83 * but exports multiple resources from one ACPI device(IPC) for
84 * multiple functions. This driver is responsible to create a
85 * platform device and to export resources for those functions.
86 */
87 #define TCO_DEVICE_NAME "iTCO_wdt"
88 #define SMI_EN_OFFSET 0x40
89 #define SMI_EN_SIZE 4
90 #define TCO_BASE_OFFSET 0x60
91 #define TCO_REGS_SIZE 16
92 #define PUNIT_DEVICE_NAME "intel_punit_ipc"
93 #define TELEMETRY_DEVICE_NAME "intel_telemetry"
94 #define TELEM_SSRAM_SIZE 240
95 #define TELEM_PMC_SSRAM_OFFSET 0x1B00
96 #define TELEM_PUNIT_SSRAM_OFFSET 0x1A00
97 #define TCO_PMC_OFFSET 0x8
98 #define TCO_PMC_SIZE 0x4
99
100 static const int iTCO_version = 3;
101
102 static struct intel_pmc_ipc_dev {
103 struct device *dev;
104 void __iomem *ipc_base;
105 bool irq_mode;
106 int irq;
107 int cmd;
108 struct completion cmd_complete;
109
110 /* The following PMC BARs share the same ACPI device with the IPC */
111 resource_size_t acpi_io_base;
112 int acpi_io_size;
113 struct platform_device *tco_dev;
114
115 /* gcr */
116 resource_size_t gcr_base;
117 int gcr_size;
118
119 /* punit */
120 struct platform_device *punit_dev;
121
122 /* Telemetry */
123 resource_size_t telem_pmc_ssram_base;
124 resource_size_t telem_punit_ssram_base;
125 int telem_pmc_ssram_size;
126 int telem_punit_ssram_size;
127 u8 telem_res_inval;
128 struct platform_device *telemetry_dev;
129 } ipcdev;
130
131 static char *ipc_err_sources[] = {
132 [IPC_ERR_NONE] =
133 "no error",
134 [IPC_ERR_CMD_NOT_SUPPORTED] =
135 "command not supported",
136 [IPC_ERR_CMD_NOT_SERVICED] =
137 "command not serviced",
138 [IPC_ERR_UNABLE_TO_SERVICE] =
139 "unable to service",
140 [IPC_ERR_CMD_INVALID] =
141 "command invalid",
142 [IPC_ERR_CMD_FAILED] =
143 "command failed",
144 [IPC_ERR_EMSECURITY] =
145 "Invalid Battery",
146 [IPC_ERR_UNSIGNEDKERNEL] =
147 "Unsigned kernel",
148 };
149
150 /* Prevent concurrent calls to the PMC */
151 static DEFINE_MUTEX(ipclock);
152
ipc_send_command(u32 cmd)153 static inline void ipc_send_command(u32 cmd)
154 {
155 ipcdev.cmd = cmd;
156 if (ipcdev.irq_mode) {
157 reinit_completion(&ipcdev.cmd_complete);
158 cmd |= IPC_CMD_MSI;
159 }
160 writel(cmd, ipcdev.ipc_base + IPC_CMD);
161 }
162
ipc_read_status(void)163 static inline u32 ipc_read_status(void)
164 {
165 return readl(ipcdev.ipc_base + IPC_STATUS);
166 }
167
ipc_data_writel(u32 data,u32 offset)168 static inline void ipc_data_writel(u32 data, u32 offset)
169 {
170 writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
171 }
172
ipc_data_readb(u32 offset)173 static inline u8 ipc_data_readb(u32 offset)
174 {
175 return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
176 }
177
ipc_data_readl(u32 offset)178 static inline u32 ipc_data_readl(u32 offset)
179 {
180 return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
181 }
182
intel_pmc_ipc_check_status(void)183 static int intel_pmc_ipc_check_status(void)
184 {
185 int status;
186 int ret = 0;
187
188 if (ipcdev.irq_mode) {
189 if (0 == wait_for_completion_timeout(
190 &ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
191 ret = -ETIMEDOUT;
192 } else {
193 int loop_count = IPC_LOOP_CNT;
194
195 while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
196 udelay(1);
197 if (loop_count == 0)
198 ret = -ETIMEDOUT;
199 }
200
201 status = ipc_read_status();
202 if (ret == -ETIMEDOUT) {
203 dev_err(ipcdev.dev,
204 "IPC timed out, TS=0x%x, CMD=0x%x\n",
205 status, ipcdev.cmd);
206 return ret;
207 }
208
209 if (status & IPC_STATUS_ERR) {
210 int i;
211
212 ret = -EIO;
213 i = (status >> IPC_CMD_SIZE) & 0xFF;
214 if (i < ARRAY_SIZE(ipc_err_sources))
215 dev_err(ipcdev.dev,
216 "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
217 ipc_err_sources[i], status, ipcdev.cmd);
218 else
219 dev_err(ipcdev.dev,
220 "IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
221 status, ipcdev.cmd);
222 if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
223 ret = -EACCES;
224 }
225
226 return ret;
227 }
228
229 /**
230 * intel_pmc_ipc_simple_command() - Simple IPC command
231 * @cmd: IPC command code.
232 * @sub: IPC command sub type.
233 *
234 * Send a simple IPC command to PMC when don't need to specify
235 * input/output data and source/dest pointers.
236 *
237 * Return: an IPC error code or 0 on success.
238 */
intel_pmc_ipc_simple_command(int cmd,int sub)239 int intel_pmc_ipc_simple_command(int cmd, int sub)
240 {
241 int ret;
242
243 mutex_lock(&ipclock);
244 if (ipcdev.dev == NULL) {
245 mutex_unlock(&ipclock);
246 return -ENODEV;
247 }
248 ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
249 ret = intel_pmc_ipc_check_status();
250 mutex_unlock(&ipclock);
251
252 return ret;
253 }
254 EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);
255
256 /**
257 * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
258 * @cmd: IPC command code.
259 * @sub: IPC command sub type.
260 * @in: input data of this IPC command.
261 * @inlen: input data length in bytes.
262 * @out: output data of this IPC command.
263 * @outlen: output data length in dwords.
264 * @sptr: data writing to SPTR register.
265 * @dptr: data writing to DPTR register.
266 *
267 * Send an IPC command to PMC with input/output data and source/dest pointers.
268 *
269 * Return: an IPC error code or 0 on success.
270 */
intel_pmc_ipc_raw_cmd(u32 cmd,u32 sub,u8 * in,u32 inlen,u32 * out,u32 outlen,u32 dptr,u32 sptr)271 int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
272 u32 outlen, u32 dptr, u32 sptr)
273 {
274 u32 wbuf[4] = { 0 };
275 int ret;
276 int i;
277
278 if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
279 return -EINVAL;
280
281 mutex_lock(&ipclock);
282 if (ipcdev.dev == NULL) {
283 mutex_unlock(&ipclock);
284 return -ENODEV;
285 }
286 memcpy(wbuf, in, inlen);
287 writel(dptr, ipcdev.ipc_base + IPC_DPTR);
288 writel(sptr, ipcdev.ipc_base + IPC_SPTR);
289 /* The input data register is 32bit register and inlen is in Byte */
290 for (i = 0; i < ((inlen + 3) / 4); i++)
291 ipc_data_writel(wbuf[i], 4 * i);
292 ipc_send_command((inlen << IPC_CMD_SIZE) |
293 (sub << IPC_CMD_SUBCMD) | cmd);
294 ret = intel_pmc_ipc_check_status();
295 if (!ret) {
296 /* out is read from 32bit register and outlen is in 32bit */
297 for (i = 0; i < outlen; i++)
298 *out++ = ipc_data_readl(4 * i);
299 }
300 mutex_unlock(&ipclock);
301
302 return ret;
303 }
304 EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);
305
306 /**
307 * intel_pmc_ipc_command() - IPC command with input/output data
308 * @cmd: IPC command code.
309 * @sub: IPC command sub type.
310 * @in: input data of this IPC command.
311 * @inlen: input data length in bytes.
312 * @out: output data of this IPC command.
313 * @outlen: output data length in dwords.
314 *
315 * Send an IPC command to PMC with input/output data.
316 *
317 * Return: an IPC error code or 0 on success.
318 */
intel_pmc_ipc_command(u32 cmd,u32 sub,u8 * in,u32 inlen,u32 * out,u32 outlen)319 int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
320 u32 *out, u32 outlen)
321 {
322 return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
323 }
324 EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);
325
ioc(int irq,void * dev_id)326 static irqreturn_t ioc(int irq, void *dev_id)
327 {
328 int status;
329
330 if (ipcdev.irq_mode) {
331 status = ipc_read_status();
332 writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
333 }
334 complete(&ipcdev.cmd_complete);
335
336 return IRQ_HANDLED;
337 }
338
ipc_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)339 static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
340 {
341 resource_size_t pci_resource;
342 int ret;
343 int len;
344
345 ipcdev.dev = &pci_dev_get(pdev)->dev;
346 ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
347
348 ret = pci_enable_device(pdev);
349 if (ret)
350 return ret;
351
352 ret = pci_request_regions(pdev, "intel_pmc_ipc");
353 if (ret)
354 return ret;
355
356 pci_resource = pci_resource_start(pdev, 0);
357 len = pci_resource_len(pdev, 0);
358 if (!pci_resource || !len) {
359 dev_err(&pdev->dev, "Failed to get resource\n");
360 return -ENOMEM;
361 }
362
363 init_completion(&ipcdev.cmd_complete);
364
365 if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
366 dev_err(&pdev->dev, "Failed to request irq\n");
367 return -EBUSY;
368 }
369
370 ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
371 if (!ipcdev.ipc_base) {
372 dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
373 free_irq(pdev->irq, &ipcdev);
374 ret = -ENOMEM;
375 }
376
377 return ret;
378 }
379
ipc_pci_remove(struct pci_dev * pdev)380 static void ipc_pci_remove(struct pci_dev *pdev)
381 {
382 free_irq(pdev->irq, &ipcdev);
383 pci_release_regions(pdev);
384 pci_dev_put(pdev);
385 iounmap(ipcdev.ipc_base);
386 ipcdev.dev = NULL;
387 }
388
389 static const struct pci_device_id ipc_pci_ids[] = {
390 {PCI_VDEVICE(INTEL, 0x0a94), 0},
391 {PCI_VDEVICE(INTEL, 0x1a94), 0},
392 { 0,}
393 };
394 MODULE_DEVICE_TABLE(pci, ipc_pci_ids);
395
396 static struct pci_driver ipc_pci_driver = {
397 .name = "intel_pmc_ipc",
398 .id_table = ipc_pci_ids,
399 .probe = ipc_pci_probe,
400 .remove = ipc_pci_remove,
401 };
402
intel_pmc_ipc_simple_cmd_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)403 static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
404 struct device_attribute *attr,
405 const char *buf, size_t count)
406 {
407 int subcmd;
408 int cmd;
409 int ret;
410
411 ret = sscanf(buf, "%d %d", &cmd, &subcmd);
412 if (ret != 2) {
413 dev_err(dev, "Error args\n");
414 return -EINVAL;
415 }
416
417 ret = intel_pmc_ipc_simple_command(cmd, subcmd);
418 if (ret) {
419 dev_err(dev, "command %d error with %d\n", cmd, ret);
420 return ret;
421 }
422 return (ssize_t)count;
423 }
424
intel_pmc_ipc_northpeak_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)425 static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
426 struct device_attribute *attr,
427 const char *buf, size_t count)
428 {
429 unsigned long val;
430 int subcmd;
431 int ret;
432
433 if (kstrtoul(buf, 0, &val))
434 return -EINVAL;
435
436 if (val)
437 subcmd = 1;
438 else
439 subcmd = 0;
440 ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
441 if (ret) {
442 dev_err(dev, "command north %d error with %d\n", subcmd, ret);
443 return ret;
444 }
445 return (ssize_t)count;
446 }
447
448 static DEVICE_ATTR(simplecmd, S_IWUSR,
449 NULL, intel_pmc_ipc_simple_cmd_store);
450 static DEVICE_ATTR(northpeak, S_IWUSR,
451 NULL, intel_pmc_ipc_northpeak_store);
452
453 static struct attribute *intel_ipc_attrs[] = {
454 &dev_attr_northpeak.attr,
455 &dev_attr_simplecmd.attr,
456 NULL
457 };
458
459 static const struct attribute_group intel_ipc_group = {
460 .attrs = intel_ipc_attrs,
461 };
462
463 static struct resource punit_res_array[] = {
464 /* Punit BIOS */
465 {
466 .flags = IORESOURCE_MEM,
467 },
468 {
469 .flags = IORESOURCE_MEM,
470 },
471 /* Punit ISP */
472 {
473 .flags = IORESOURCE_MEM,
474 },
475 {
476 .flags = IORESOURCE_MEM,
477 },
478 /* Punit GTD */
479 {
480 .flags = IORESOURCE_MEM,
481 },
482 {
483 .flags = IORESOURCE_MEM,
484 },
485 };
486
487 #define TCO_RESOURCE_ACPI_IO 0
488 #define TCO_RESOURCE_SMI_EN_IO 1
489 #define TCO_RESOURCE_GCR_MEM 2
490 static struct resource tco_res[] = {
491 /* ACPI - TCO */
492 {
493 .flags = IORESOURCE_IO,
494 },
495 /* ACPI - SMI */
496 {
497 .flags = IORESOURCE_IO,
498 },
499 /* GCS */
500 {
501 .flags = IORESOURCE_MEM,
502 },
503 };
504
505 static struct itco_wdt_platform_data tco_info = {
506 .name = "Apollo Lake SoC",
507 .version = 5,
508 };
509
510 #define TELEMETRY_RESOURCE_PUNIT_SSRAM 0
511 #define TELEMETRY_RESOURCE_PMC_SSRAM 1
512 static struct resource telemetry_res[] = {
513 /*Telemetry*/
514 {
515 .flags = IORESOURCE_MEM,
516 },
517 {
518 .flags = IORESOURCE_MEM,
519 },
520 };
521
ipc_create_punit_device(void)522 static int ipc_create_punit_device(void)
523 {
524 struct platform_device *pdev;
525 const struct platform_device_info pdevinfo = {
526 .parent = ipcdev.dev,
527 .name = PUNIT_DEVICE_NAME,
528 .id = -1,
529 .res = punit_res_array,
530 .num_res = ARRAY_SIZE(punit_res_array),
531 };
532
533 pdev = platform_device_register_full(&pdevinfo);
534 if (IS_ERR(pdev))
535 return PTR_ERR(pdev);
536
537 ipcdev.punit_dev = pdev;
538
539 return 0;
540 }
541
ipc_create_tco_device(void)542 static int ipc_create_tco_device(void)
543 {
544 struct platform_device *pdev;
545 struct resource *res;
546 const struct platform_device_info pdevinfo = {
547 .parent = ipcdev.dev,
548 .name = TCO_DEVICE_NAME,
549 .id = -1,
550 .res = tco_res,
551 .num_res = ARRAY_SIZE(tco_res),
552 .data = &tco_info,
553 .size_data = sizeof(tco_info),
554 };
555
556 res = tco_res + TCO_RESOURCE_ACPI_IO;
557 res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
558 res->end = res->start + TCO_REGS_SIZE - 1;
559
560 res = tco_res + TCO_RESOURCE_SMI_EN_IO;
561 res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
562 res->end = res->start + SMI_EN_SIZE - 1;
563
564 res = tco_res + TCO_RESOURCE_GCR_MEM;
565 res->start = ipcdev.gcr_base + TCO_PMC_OFFSET;
566 res->end = res->start + TCO_PMC_SIZE - 1;
567
568 pdev = platform_device_register_full(&pdevinfo);
569 if (IS_ERR(pdev))
570 return PTR_ERR(pdev);
571
572 ipcdev.tco_dev = pdev;
573
574 return 0;
575 }
576
ipc_create_telemetry_device(void)577 static int ipc_create_telemetry_device(void)
578 {
579 struct platform_device *pdev;
580 struct resource *res;
581 const struct platform_device_info pdevinfo = {
582 .parent = ipcdev.dev,
583 .name = TELEMETRY_DEVICE_NAME,
584 .id = -1,
585 .res = telemetry_res,
586 .num_res = ARRAY_SIZE(telemetry_res),
587 };
588
589 res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
590 res->start = ipcdev.telem_punit_ssram_base;
591 res->end = res->start + ipcdev.telem_punit_ssram_size - 1;
592
593 res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
594 res->start = ipcdev.telem_pmc_ssram_base;
595 res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;
596
597 pdev = platform_device_register_full(&pdevinfo);
598 if (IS_ERR(pdev))
599 return PTR_ERR(pdev);
600
601 ipcdev.telemetry_dev = pdev;
602
603 return 0;
604 }
605
ipc_create_pmc_devices(void)606 static int ipc_create_pmc_devices(void)
607 {
608 int ret;
609
610 /* If we have ACPI based watchdog use that instead */
611 if (!acpi_has_watchdog()) {
612 ret = ipc_create_tco_device();
613 if (ret) {
614 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
615 return ret;
616 }
617 }
618
619 ret = ipc_create_punit_device();
620 if (ret) {
621 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
622 platform_device_unregister(ipcdev.tco_dev);
623 }
624
625 if (!ipcdev.telem_res_inval) {
626 ret = ipc_create_telemetry_device();
627 if (ret)
628 dev_warn(ipcdev.dev,
629 "Failed to add telemetry platform device\n");
630 }
631
632 return ret;
633 }
634
ipc_plat_get_res(struct platform_device * pdev)635 static int ipc_plat_get_res(struct platform_device *pdev)
636 {
637 struct resource *res, *punit_res;
638 void __iomem *addr;
639 int size;
640
641 res = platform_get_resource(pdev, IORESOURCE_IO,
642 PLAT_RESOURCE_ACPI_IO_INDEX);
643 if (!res) {
644 dev_err(&pdev->dev, "Failed to get io resource\n");
645 return -ENXIO;
646 }
647 size = resource_size(res);
648 ipcdev.acpi_io_base = res->start;
649 ipcdev.acpi_io_size = size;
650 dev_info(&pdev->dev, "io res: %pR\n", res);
651
652 punit_res = punit_res_array;
653 /* This is index 0 to cover BIOS data register */
654 res = platform_get_resource(pdev, IORESOURCE_MEM,
655 PLAT_RESOURCE_BIOS_DATA_INDEX);
656 if (!res) {
657 dev_err(&pdev->dev, "Failed to get res of punit BIOS data\n");
658 return -ENXIO;
659 }
660 *punit_res = *res;
661 dev_info(&pdev->dev, "punit BIOS data res: %pR\n", res);
662
663 /* This is index 1 to cover BIOS interface register */
664 res = platform_get_resource(pdev, IORESOURCE_MEM,
665 PLAT_RESOURCE_BIOS_IFACE_INDEX);
666 if (!res) {
667 dev_err(&pdev->dev, "Failed to get res of punit BIOS iface\n");
668 return -ENXIO;
669 }
670 *++punit_res = *res;
671 dev_info(&pdev->dev, "punit BIOS interface res: %pR\n", res);
672
673 /* This is index 2 to cover ISP data register, optional */
674 res = platform_get_resource(pdev, IORESOURCE_MEM,
675 PLAT_RESOURCE_ISP_DATA_INDEX);
676 ++punit_res;
677 if (res) {
678 *punit_res = *res;
679 dev_info(&pdev->dev, "punit ISP data res: %pR\n", res);
680 }
681
682 /* This is index 3 to cover ISP interface register, optional */
683 res = platform_get_resource(pdev, IORESOURCE_MEM,
684 PLAT_RESOURCE_ISP_IFACE_INDEX);
685 ++punit_res;
686 if (res) {
687 *punit_res = *res;
688 dev_info(&pdev->dev, "punit ISP interface res: %pR\n", res);
689 }
690
691 /* This is index 4 to cover GTD data register, optional */
692 res = platform_get_resource(pdev, IORESOURCE_MEM,
693 PLAT_RESOURCE_GTD_DATA_INDEX);
694 ++punit_res;
695 if (res) {
696 *punit_res = *res;
697 dev_info(&pdev->dev, "punit GTD data res: %pR\n", res);
698 }
699
700 /* This is index 5 to cover GTD interface register, optional */
701 res = platform_get_resource(pdev, IORESOURCE_MEM,
702 PLAT_RESOURCE_GTD_IFACE_INDEX);
703 ++punit_res;
704 if (res) {
705 *punit_res = *res;
706 dev_info(&pdev->dev, "punit GTD interface res: %pR\n", res);
707 }
708
709 res = platform_get_resource(pdev, IORESOURCE_MEM,
710 PLAT_RESOURCE_IPC_INDEX);
711 if (!res) {
712 dev_err(&pdev->dev, "Failed to get ipc resource\n");
713 return -ENXIO;
714 }
715 size = PLAT_RESOURCE_IPC_SIZE;
716 if (!request_mem_region(res->start, size, pdev->name)) {
717 dev_err(&pdev->dev, "Failed to request ipc resource\n");
718 return -EBUSY;
719 }
720 addr = ioremap_nocache(res->start, size);
721 if (!addr) {
722 dev_err(&pdev->dev, "I/O memory remapping failed\n");
723 release_mem_region(res->start, size);
724 return -ENOMEM;
725 }
726 ipcdev.ipc_base = addr;
727
728 ipcdev.gcr_base = res->start + PLAT_RESOURCE_GCR_OFFSET;
729 ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
730 dev_info(&pdev->dev, "ipc res: %pR\n", res);
731
732 ipcdev.telem_res_inval = 0;
733 res = platform_get_resource(pdev, IORESOURCE_MEM,
734 PLAT_RESOURCE_TELEM_SSRAM_INDEX);
735 if (!res) {
736 dev_err(&pdev->dev, "Failed to get telemetry ssram resource\n");
737 ipcdev.telem_res_inval = 1;
738 } else {
739 ipcdev.telem_punit_ssram_base = res->start +
740 TELEM_PUNIT_SSRAM_OFFSET;
741 ipcdev.telem_punit_ssram_size = TELEM_SSRAM_SIZE;
742 ipcdev.telem_pmc_ssram_base = res->start +
743 TELEM_PMC_SSRAM_OFFSET;
744 ipcdev.telem_pmc_ssram_size = TELEM_SSRAM_SIZE;
745 dev_info(&pdev->dev, "telemetry ssram res: %pR\n", res);
746 }
747
748 return 0;
749 }
750
751 #ifdef CONFIG_ACPI
752 static const struct acpi_device_id ipc_acpi_ids[] = {
753 { "INT34D2", 0},
754 { }
755 };
756 MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
757 #endif
758
ipc_plat_probe(struct platform_device * pdev)759 static int ipc_plat_probe(struct platform_device *pdev)
760 {
761 struct resource *res;
762 int ret;
763
764 ipcdev.dev = &pdev->dev;
765 ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
766 init_completion(&ipcdev.cmd_complete);
767
768 ipcdev.irq = platform_get_irq(pdev, 0);
769 if (ipcdev.irq < 0) {
770 dev_err(&pdev->dev, "Failed to get irq\n");
771 return -EINVAL;
772 }
773
774 ret = ipc_plat_get_res(pdev);
775 if (ret) {
776 dev_err(&pdev->dev, "Failed to request resource\n");
777 return ret;
778 }
779
780 ret = ipc_create_pmc_devices();
781 if (ret) {
782 dev_err(&pdev->dev, "Failed to create pmc devices\n");
783 goto err_device;
784 }
785
786 if (request_irq(ipcdev.irq, ioc, IRQF_NO_SUSPEND,
787 "intel_pmc_ipc", &ipcdev)) {
788 dev_err(&pdev->dev, "Failed to request irq\n");
789 ret = -EBUSY;
790 goto err_irq;
791 }
792
793 ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
794 if (ret) {
795 dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
796 ret);
797 goto err_sys;
798 }
799
800 return 0;
801 err_sys:
802 free_irq(ipcdev.irq, &ipcdev);
803 err_irq:
804 platform_device_unregister(ipcdev.tco_dev);
805 platform_device_unregister(ipcdev.punit_dev);
806 platform_device_unregister(ipcdev.telemetry_dev);
807 err_device:
808 iounmap(ipcdev.ipc_base);
809 res = platform_get_resource(pdev, IORESOURCE_MEM,
810 PLAT_RESOURCE_IPC_INDEX);
811 if (res)
812 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
813 return ret;
814 }
815
ipc_plat_remove(struct platform_device * pdev)816 static int ipc_plat_remove(struct platform_device *pdev)
817 {
818 struct resource *res;
819
820 sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
821 free_irq(ipcdev.irq, &ipcdev);
822 platform_device_unregister(ipcdev.tco_dev);
823 platform_device_unregister(ipcdev.punit_dev);
824 platform_device_unregister(ipcdev.telemetry_dev);
825 iounmap(ipcdev.ipc_base);
826 res = platform_get_resource(pdev, IORESOURCE_MEM,
827 PLAT_RESOURCE_IPC_INDEX);
828 if (res)
829 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
830 ipcdev.dev = NULL;
831 return 0;
832 }
833
834 static struct platform_driver ipc_plat_driver = {
835 .remove = ipc_plat_remove,
836 .probe = ipc_plat_probe,
837 .driver = {
838 .name = "pmc-ipc-plat",
839 .acpi_match_table = ACPI_PTR(ipc_acpi_ids),
840 },
841 };
842
intel_pmc_ipc_init(void)843 static int __init intel_pmc_ipc_init(void)
844 {
845 int ret;
846
847 ret = platform_driver_register(&ipc_plat_driver);
848 if (ret) {
849 pr_err("Failed to register PMC ipc platform driver\n");
850 return ret;
851 }
852 ret = pci_register_driver(&ipc_pci_driver);
853 if (ret) {
854 pr_err("Failed to register PMC ipc pci driver\n");
855 platform_driver_unregister(&ipc_plat_driver);
856 return ret;
857 }
858 return ret;
859 }
860
intel_pmc_ipc_exit(void)861 static void __exit intel_pmc_ipc_exit(void)
862 {
863 pci_unregister_driver(&ipc_pci_driver);
864 platform_driver_unregister(&ipc_plat_driver);
865 }
866
867 MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
868 MODULE_DESCRIPTION("Intel PMC IPC driver");
869 MODULE_LICENSE("GPL");
870
871 /* Some modules are dependent on this, so init earlier */
872 fs_initcall(intel_pmc_ipc_init);
873 module_exit(intel_pmc_ipc_exit);
874