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adf38bb0 ZY |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved. | |
4 | * Author: Zhichang Yuan <yuanzhichang@hisilicon.com> | |
5 | * Author: Zou Rongrong <zourongrong@huawei.com> | |
6 | * Author: John Garry <john.garry@huawei.com> | |
7 | */ | |
8 | ||
9 | #include <linux/acpi.h> | |
10 | #include <linux/console.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/logic_pio.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_address.h> | |
17 | #include <linux/of_platform.h> | |
18 | #include <linux/pci.h> | |
adf3457b | 19 | #include <linux/serial_8250.h> |
adf38bb0 ZY |
20 | #include <linux/slab.h> |
21 | ||
22 | #define DRV_NAME "hisi-lpc" | |
23 | ||
24 | /* | |
25 | * Setting this bit means each IO operation will target a different port | |
26 | * address; 0 means repeated IO operations will use the same port, | |
27 | * such as BT. | |
28 | */ | |
29 | #define FG_INCRADDR_LPC 0x02 | |
30 | ||
31 | struct lpc_cycle_para { | |
32 | unsigned int opflags; | |
33 | unsigned int csize; /* data length of each operation */ | |
34 | }; | |
35 | ||
36 | struct hisi_lpc_dev { | |
37 | spinlock_t cycle_lock; | |
38 | void __iomem *membase; | |
39 | struct logic_pio_hwaddr *io_host; | |
40 | }; | |
41 | ||
42 | /* The max IO cycle counts supported is four per operation at maximum */ | |
43 | #define LPC_MAX_DWIDTH 4 | |
44 | ||
45 | #define LPC_REG_STARTUP_SIGNAL 0x00 | |
46 | #define LPC_REG_STARTUP_SIGNAL_START BIT(0) | |
47 | #define LPC_REG_OP_STATUS 0x04 | |
48 | #define LPC_REG_OP_STATUS_IDLE BIT(0) | |
49 | #define LPC_REG_OP_STATUS_FINISHED BIT(1) | |
50 | #define LPC_REG_OP_LEN 0x10 /* LPC cycles count per start */ | |
51 | #define LPC_REG_CMD 0x14 | |
52 | #define LPC_REG_CMD_OP BIT(0) /* 0: read, 1: write */ | |
53 | #define LPC_REG_CMD_SAMEADDR BIT(3) | |
54 | #define LPC_REG_ADDR 0x20 /* target address */ | |
55 | #define LPC_REG_WDATA 0x24 /* write FIFO */ | |
56 | #define LPC_REG_RDATA 0x28 /* read FIFO */ | |
57 | ||
58 | /* The minimal nanosecond interval for each query on LPC cycle status */ | |
59 | #define LPC_NSEC_PERWAIT 100 | |
60 | ||
61 | /* | |
62 | * The maximum waiting time is about 128us. It is specific for stream I/O, | |
63 | * such as ins. | |
64 | * | |
65 | * The fastest IO cycle time is about 390ns, but the worst case will wait | |
66 | * for extra 256 lpc clocks, so (256 + 13) * 30ns = 8 us. The maximum burst | |
67 | * cycles is 16. So, the maximum waiting time is about 128us under worst | |
68 | * case. | |
69 | * | |
70 | * Choose 1300 as the maximum. | |
71 | */ | |
72 | #define LPC_MAX_WAITCNT 1300 | |
73 | ||
74 | /* About 10us. This is specific for single IO operations, such as inb */ | |
75 | #define LPC_PEROP_WAITCNT 100 | |
76 | ||
77 | static int wait_lpc_idle(unsigned char *mbase, unsigned int waitcnt) | |
78 | { | |
79 | u32 status; | |
80 | ||
81 | do { | |
82 | status = readl(mbase + LPC_REG_OP_STATUS); | |
83 | if (status & LPC_REG_OP_STATUS_IDLE) | |
84 | return (status & LPC_REG_OP_STATUS_FINISHED) ? 0 : -EIO; | |
85 | ndelay(LPC_NSEC_PERWAIT); | |
86 | } while (--waitcnt); | |
87 | ||
88 | return -ETIME; | |
89 | } | |
90 | ||
91 | /* | |
92 | * hisi_lpc_target_in - trigger a series of LPC cycles for read operation | |
93 | * @lpcdev: pointer to hisi lpc device | |
94 | * @para: some parameters used to control the lpc I/O operations | |
95 | * @addr: the lpc I/O target port address | |
96 | * @buf: where the read back data is stored | |
97 | * @opcnt: how many I/O operations required, i.e. data width | |
98 | * | |
99 | * Returns 0 on success, non-zero on fail. | |
100 | */ | |
101 | static int hisi_lpc_target_in(struct hisi_lpc_dev *lpcdev, | |
102 | struct lpc_cycle_para *para, unsigned long addr, | |
103 | unsigned char *buf, unsigned long opcnt) | |
104 | { | |
105 | unsigned int cmd_word; | |
106 | unsigned int waitcnt; | |
107 | unsigned long flags; | |
108 | int ret; | |
109 | ||
110 | if (!buf || !opcnt || !para || !para->csize || !lpcdev) | |
111 | return -EINVAL; | |
112 | ||
113 | cmd_word = 0; /* IO mode, Read */ | |
114 | waitcnt = LPC_PEROP_WAITCNT; | |
115 | if (!(para->opflags & FG_INCRADDR_LPC)) { | |
116 | cmd_word |= LPC_REG_CMD_SAMEADDR; | |
117 | waitcnt = LPC_MAX_WAITCNT; | |
118 | } | |
119 | ||
120 | /* whole operation must be atomic */ | |
121 | spin_lock_irqsave(&lpcdev->cycle_lock, flags); | |
122 | ||
123 | writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN); | |
124 | writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD); | |
125 | writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR); | |
126 | ||
127 | writel(LPC_REG_STARTUP_SIGNAL_START, | |
128 | lpcdev->membase + LPC_REG_STARTUP_SIGNAL); | |
129 | ||
130 | /* whether the operation is finished */ | |
131 | ret = wait_lpc_idle(lpcdev->membase, waitcnt); | |
132 | if (ret) { | |
133 | spin_unlock_irqrestore(&lpcdev->cycle_lock, flags); | |
134 | return ret; | |
135 | } | |
136 | ||
137 | readsb(lpcdev->membase + LPC_REG_RDATA, buf, opcnt); | |
138 | ||
139 | spin_unlock_irqrestore(&lpcdev->cycle_lock, flags); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | /* | |
145 | * hisi_lpc_target_out - trigger a series of LPC cycles for write operation | |
146 | * @lpcdev: pointer to hisi lpc device | |
147 | * @para: some parameters used to control the lpc I/O operations | |
148 | * @addr: the lpc I/O target port address | |
149 | * @buf: where the data to be written is stored | |
150 | * @opcnt: how many I/O operations required, i.e. data width | |
151 | * | |
152 | * Returns 0 on success, non-zero on fail. | |
153 | */ | |
154 | static int hisi_lpc_target_out(struct hisi_lpc_dev *lpcdev, | |
155 | struct lpc_cycle_para *para, unsigned long addr, | |
156 | const unsigned char *buf, unsigned long opcnt) | |
157 | { | |
158 | unsigned int waitcnt; | |
159 | unsigned long flags; | |
160 | u32 cmd_word; | |
161 | int ret; | |
162 | ||
163 | if (!buf || !opcnt || !para || !lpcdev) | |
164 | return -EINVAL; | |
165 | ||
166 | /* default is increasing address */ | |
167 | cmd_word = LPC_REG_CMD_OP; /* IO mode, write */ | |
168 | waitcnt = LPC_PEROP_WAITCNT; | |
169 | if (!(para->opflags & FG_INCRADDR_LPC)) { | |
170 | cmd_word |= LPC_REG_CMD_SAMEADDR; | |
171 | waitcnt = LPC_MAX_WAITCNT; | |
172 | } | |
173 | ||
174 | spin_lock_irqsave(&lpcdev->cycle_lock, flags); | |
175 | ||
176 | writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN); | |
177 | writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD); | |
178 | writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR); | |
179 | ||
180 | writesb(lpcdev->membase + LPC_REG_WDATA, buf, opcnt); | |
181 | ||
182 | writel(LPC_REG_STARTUP_SIGNAL_START, | |
183 | lpcdev->membase + LPC_REG_STARTUP_SIGNAL); | |
184 | ||
185 | /* whether the operation is finished */ | |
186 | ret = wait_lpc_idle(lpcdev->membase, waitcnt); | |
187 | ||
188 | spin_unlock_irqrestore(&lpcdev->cycle_lock, flags); | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | static unsigned long hisi_lpc_pio_to_addr(struct hisi_lpc_dev *lpcdev, | |
194 | unsigned long pio) | |
195 | { | |
196 | return pio - lpcdev->io_host->io_start + lpcdev->io_host->hw_start; | |
197 | } | |
198 | ||
199 | /* | |
200 | * hisi_lpc_comm_in - input the data in a single operation | |
201 | * @hostdata: pointer to the device information relevant to LPC controller | |
202 | * @pio: the target I/O port address | |
203 | * @dwidth: the data length required to read from the target I/O port | |
204 | * | |
205 | * When success, data is returned. Otherwise, ~0 is returned. | |
206 | */ | |
207 | static u32 hisi_lpc_comm_in(void *hostdata, unsigned long pio, size_t dwidth) | |
208 | { | |
209 | struct hisi_lpc_dev *lpcdev = hostdata; | |
210 | struct lpc_cycle_para iopara; | |
211 | unsigned long addr; | |
212 | u32 rd_data = 0; | |
213 | int ret; | |
214 | ||
215 | if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH) | |
216 | return ~0; | |
217 | ||
218 | addr = hisi_lpc_pio_to_addr(lpcdev, pio); | |
219 | ||
220 | iopara.opflags = FG_INCRADDR_LPC; | |
221 | iopara.csize = dwidth; | |
222 | ||
223 | ret = hisi_lpc_target_in(lpcdev, &iopara, addr, | |
224 | (unsigned char *)&rd_data, dwidth); | |
225 | if (ret) | |
226 | return ~0; | |
227 | ||
228 | return le32_to_cpu(rd_data); | |
229 | } | |
230 | ||
231 | /* | |
232 | * hisi_lpc_comm_out - output the data in a single operation | |
233 | * @hostdata: pointer to the device information relevant to LPC controller | |
234 | * @pio: the target I/O port address | |
235 | * @val: a value to be output from caller, maximum is four bytes | |
236 | * @dwidth: the data width required writing to the target I/O port | |
237 | * | |
238 | * This function corresponds to out(b,w,l) only. | |
239 | */ | |
240 | static void hisi_lpc_comm_out(void *hostdata, unsigned long pio, | |
241 | u32 val, size_t dwidth) | |
242 | { | |
243 | struct hisi_lpc_dev *lpcdev = hostdata; | |
244 | struct lpc_cycle_para iopara; | |
245 | const unsigned char *buf; | |
246 | unsigned long addr; | |
247 | ||
248 | if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH) | |
249 | return; | |
250 | ||
251 | val = cpu_to_le32(val); | |
252 | ||
253 | buf = (const unsigned char *)&val; | |
254 | addr = hisi_lpc_pio_to_addr(lpcdev, pio); | |
255 | ||
256 | iopara.opflags = FG_INCRADDR_LPC; | |
257 | iopara.csize = dwidth; | |
258 | ||
259 | hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth); | |
260 | } | |
261 | ||
262 | /* | |
263 | * hisi_lpc_comm_ins - input the data in the buffer in multiple operations | |
264 | * @hostdata: pointer to the device information relevant to LPC controller | |
265 | * @pio: the target I/O port address | |
266 | * @buffer: a buffer where read/input data bytes are stored | |
267 | * @dwidth: the data width required writing to the target I/O port | |
268 | * @count: how many data units whose length is dwidth will be read | |
269 | * | |
270 | * When success, the data read back is stored in buffer pointed by buffer. | |
271 | * Returns 0 on success, -errno otherwise. | |
272 | */ | |
273 | static u32 hisi_lpc_comm_ins(void *hostdata, unsigned long pio, void *buffer, | |
274 | size_t dwidth, unsigned int count) | |
275 | { | |
276 | struct hisi_lpc_dev *lpcdev = hostdata; | |
277 | unsigned char *buf = buffer; | |
278 | struct lpc_cycle_para iopara; | |
279 | unsigned long addr; | |
280 | ||
281 | if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH) | |
282 | return -EINVAL; | |
283 | ||
284 | iopara.opflags = 0; | |
285 | if (dwidth > 1) | |
286 | iopara.opflags |= FG_INCRADDR_LPC; | |
287 | iopara.csize = dwidth; | |
288 | ||
289 | addr = hisi_lpc_pio_to_addr(lpcdev, pio); | |
290 | ||
291 | do { | |
292 | int ret; | |
293 | ||
294 | ret = hisi_lpc_target_in(lpcdev, &iopara, addr, buf, dwidth); | |
295 | if (ret) | |
296 | return ret; | |
297 | buf += dwidth; | |
298 | } while (--count); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | /* | |
304 | * hisi_lpc_comm_outs - output the data in the buffer in multiple operations | |
305 | * @hostdata: pointer to the device information relevant to LPC controller | |
306 | * @pio: the target I/O port address | |
307 | * @buffer: a buffer where write/output data bytes are stored | |
308 | * @dwidth: the data width required writing to the target I/O port | |
309 | * @count: how many data units whose length is dwidth will be written | |
310 | */ | |
311 | static void hisi_lpc_comm_outs(void *hostdata, unsigned long pio, | |
312 | const void *buffer, size_t dwidth, | |
313 | unsigned int count) | |
314 | { | |
315 | struct hisi_lpc_dev *lpcdev = hostdata; | |
316 | struct lpc_cycle_para iopara; | |
317 | const unsigned char *buf = buffer; | |
318 | unsigned long addr; | |
319 | ||
320 | if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH) | |
321 | return; | |
322 | ||
323 | iopara.opflags = 0; | |
324 | if (dwidth > 1) | |
325 | iopara.opflags |= FG_INCRADDR_LPC; | |
326 | iopara.csize = dwidth; | |
327 | ||
328 | addr = hisi_lpc_pio_to_addr(lpcdev, pio); | |
329 | do { | |
330 | if (hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth)) | |
331 | break; | |
332 | buf += dwidth; | |
333 | } while (--count); | |
334 | } | |
335 | ||
336 | static const struct logic_pio_host_ops hisi_lpc_ops = { | |
337 | .in = hisi_lpc_comm_in, | |
338 | .out = hisi_lpc_comm_out, | |
339 | .ins = hisi_lpc_comm_ins, | |
340 | .outs = hisi_lpc_comm_outs, | |
341 | }; | |
342 | ||
e0aa1563 | 343 | #ifdef CONFIG_ACPI |
e0aa1563 JG |
344 | static int hisi_lpc_acpi_xlat_io_res(struct acpi_device *adev, |
345 | struct acpi_device *host, | |
346 | struct resource *res) | |
347 | { | |
348 | unsigned long sys_port; | |
349 | resource_size_t len = resource_size(res); | |
350 | ||
351 | sys_port = logic_pio_trans_hwaddr(&host->fwnode, res->start, len); | |
352 | if (sys_port == ~0UL) | |
353 | return -EFAULT; | |
354 | ||
355 | res->start = sys_port; | |
356 | res->end = sys_port + len; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | /* | |
332f632e | 362 | * hisi_lpc_acpi_set_io_res - set the resources for a child |
e0aa1563 JG |
363 | * @child: the device node to be updated the I/O resource |
364 | * @hostdev: the device node associated with host controller | |
365 | * @res: double pointer to be set to the address of translated resources | |
366 | * @num_res: pointer to variable to hold the number of translated resources | |
367 | * | |
368 | * Returns 0 when successful, and a negative value for failure. | |
369 | * | |
370 | * For a given host controller, each child device will have an associated | |
371 | * host-relative address resource. This function will return the translated | |
372 | * logical PIO addresses for each child devices resources. | |
373 | */ | |
374 | static int hisi_lpc_acpi_set_io_res(struct device *child, | |
375 | struct device *hostdev, | |
376 | const struct resource **res, int *num_res) | |
377 | { | |
378 | struct acpi_device *adev; | |
379 | struct acpi_device *host; | |
380 | struct resource_entry *rentry; | |
381 | LIST_HEAD(resource_list); | |
382 | struct resource *resources; | |
383 | int count; | |
384 | int i; | |
385 | ||
386 | if (!child || !hostdev) | |
387 | return -EINVAL; | |
388 | ||
389 | host = to_acpi_device(hostdev); | |
390 | adev = to_acpi_device(child); | |
391 | ||
392 | if (!adev->status.present) { | |
393 | dev_dbg(child, "device is not present\n"); | |
394 | return -EIO; | |
395 | } | |
396 | ||
397 | if (acpi_device_enumerated(adev)) { | |
398 | dev_dbg(child, "has been enumerated\n"); | |
399 | return -EIO; | |
400 | } | |
401 | ||
402 | /* | |
403 | * The following code segment to retrieve the resources is common to | |
404 | * acpi_create_platform_device(), so consider a common helper function | |
405 | * in future. | |
406 | */ | |
407 | count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
408 | if (count <= 0) { | |
409 | dev_dbg(child, "failed to get resources\n"); | |
410 | return count ? count : -EIO; | |
411 | } | |
412 | ||
413 | resources = devm_kcalloc(hostdev, count, sizeof(*resources), | |
414 | GFP_KERNEL); | |
415 | if (!resources) { | |
416 | dev_warn(hostdev, "could not allocate memory for %d resources\n", | |
417 | count); | |
418 | acpi_dev_free_resource_list(&resource_list); | |
419 | return -ENOMEM; | |
420 | } | |
421 | count = 0; | |
422 | list_for_each_entry(rentry, &resource_list, node) | |
423 | resources[count++] = *rentry->res; | |
424 | ||
425 | acpi_dev_free_resource_list(&resource_list); | |
426 | ||
427 | /* translate the I/O resources */ | |
428 | for (i = 0; i < count; i++) { | |
429 | int ret; | |
430 | ||
431 | if (!(resources[i].flags & IORESOURCE_IO)) | |
432 | continue; | |
433 | ret = hisi_lpc_acpi_xlat_io_res(adev, host, &resources[i]); | |
434 | if (ret) { | |
435 | dev_err(child, "translate IO range %pR failed (%d)\n", | |
436 | &resources[i], ret); | |
437 | return ret; | |
438 | } | |
439 | } | |
440 | *res = resources; | |
441 | *num_res = count; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
99c0228d JG |
446 | static int hisi_lpc_acpi_remove_subdev(struct device *dev, void *unused) |
447 | { | |
448 | platform_device_unregister(to_platform_device(dev)); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | struct hisi_lpc_acpi_cell { | |
453 | const char *hid; | |
454 | const char *name; | |
455 | void *pdata; | |
456 | size_t pdata_size; | |
457 | }; | |
458 | ||
e0aa1563 JG |
459 | /* |
460 | * hisi_lpc_acpi_probe - probe children for ACPI FW | |
461 | * @hostdev: LPC host device pointer | |
462 | * | |
463 | * Returns 0 when successful, and a negative value for failure. | |
464 | * | |
99c0228d JG |
465 | * Create a platform device per child, fixing up the resources |
466 | * from bus addresses to Logical PIO addresses. | |
467 | * | |
e0aa1563 JG |
468 | */ |
469 | static int hisi_lpc_acpi_probe(struct device *hostdev) | |
470 | { | |
471 | struct acpi_device *adev = ACPI_COMPANION(hostdev); | |
e0aa1563 | 472 | struct acpi_device *child; |
332f632e | 473 | int ret; |
e0aa1563 | 474 | |
e0aa1563 JG |
475 | /* Only consider the children of the host */ |
476 | list_for_each_entry(child, &adev->children, node) { | |
99c0228d JG |
477 | const char *hid = acpi_device_hid(child); |
478 | const struct hisi_lpc_acpi_cell *cell; | |
479 | struct platform_device *pdev; | |
332f632e | 480 | const struct resource *res; |
99c0228d | 481 | bool found = false; |
332f632e JG |
482 | int num_res; |
483 | ||
484 | ret = hisi_lpc_acpi_set_io_res(&child->dev, &adev->dev, &res, | |
485 | &num_res); | |
e0aa1563 | 486 | if (ret) { |
332f632e | 487 | dev_warn(hostdev, "set resource fail (%d)\n", ret); |
99c0228d JG |
488 | goto fail; |
489 | } | |
490 | ||
491 | cell = (struct hisi_lpc_acpi_cell []){ | |
492 | /* ipmi */ | |
493 | { | |
494 | .hid = "IPI0001", | |
495 | .name = "hisi-lpc-ipmi", | |
496 | }, | |
adf3457b JG |
497 | /* 8250-compatible uart */ |
498 | { | |
499 | .hid = "HISI1031", | |
500 | .name = "serial8250", | |
501 | .pdata = (struct plat_serial8250_port []) { | |
502 | { | |
503 | .iobase = res->start, | |
504 | .uartclk = 1843200, | |
505 | .iotype = UPIO_PORT, | |
506 | .flags = UPF_BOOT_AUTOCONF, | |
507 | }, | |
508 | {} | |
509 | }, | |
510 | .pdata_size = 2 * | |
511 | sizeof(struct plat_serial8250_port), | |
512 | }, | |
99c0228d JG |
513 | {} |
514 | }; | |
515 | ||
516 | for (; cell && cell->name; cell++) { | |
517 | if (!strcmp(cell->hid, hid)) { | |
518 | found = true; | |
519 | break; | |
520 | } | |
e0aa1563 | 521 | } |
99c0228d JG |
522 | |
523 | if (!found) { | |
524 | dev_warn(hostdev, | |
705c0ee8 | 525 | "could not find cell for child device (%s), discarding\n", |
99c0228d | 526 | hid); |
705c0ee8 | 527 | continue; |
99c0228d JG |
528 | } |
529 | ||
530 | pdev = platform_device_alloc(cell->name, PLATFORM_DEVID_AUTO); | |
531 | if (!pdev) { | |
532 | ret = -ENOMEM; | |
533 | goto fail; | |
534 | } | |
535 | ||
536 | pdev->dev.parent = hostdev; | |
537 | ACPI_COMPANION_SET(&pdev->dev, child); | |
538 | ||
539 | ret = platform_device_add_resources(pdev, res, num_res); | |
540 | if (ret) | |
541 | goto fail; | |
542 | ||
543 | ret = platform_device_add_data(pdev, cell->pdata, | |
544 | cell->pdata_size); | |
545 | if (ret) | |
546 | goto fail; | |
547 | ||
548 | ret = platform_device_add(pdev); | |
549 | if (ret) | |
550 | goto fail; | |
551 | ||
552 | acpi_device_set_enumerated(child); | |
e0aa1563 JG |
553 | } |
554 | ||
555 | return 0; | |
99c0228d JG |
556 | |
557 | fail: | |
558 | device_for_each_child(hostdev, NULL, | |
559 | hisi_lpc_acpi_remove_subdev); | |
560 | return ret; | |
e0aa1563 JG |
561 | } |
562 | ||
563 | static const struct acpi_device_id hisi_lpc_acpi_match[] = { | |
564 | {"HISI0191"}, | |
565 | {} | |
566 | }; | |
567 | #else | |
568 | static int hisi_lpc_acpi_probe(struct device *dev) | |
569 | { | |
570 | return -ENODEV; | |
571 | } | |
572 | #endif // CONFIG_ACPI | |
573 | ||
adf38bb0 ZY |
574 | /* |
575 | * hisi_lpc_probe - the probe callback function for hisi lpc host, | |
576 | * will finish all the initialization. | |
577 | * @pdev: the platform device corresponding to hisi lpc host | |
578 | * | |
579 | * Returns 0 on success, non-zero on fail. | |
580 | */ | |
581 | static int hisi_lpc_probe(struct platform_device *pdev) | |
582 | { | |
583 | struct device *dev = &pdev->dev; | |
584 | struct acpi_device *acpi_device = ACPI_COMPANION(dev); | |
585 | struct logic_pio_hwaddr *range; | |
586 | struct hisi_lpc_dev *lpcdev; | |
587 | resource_size_t io_end; | |
588 | struct resource *res; | |
589 | int ret; | |
590 | ||
591 | lpcdev = devm_kzalloc(dev, sizeof(*lpcdev), GFP_KERNEL); | |
592 | if (!lpcdev) | |
593 | return -ENOMEM; | |
594 | ||
595 | spin_lock_init(&lpcdev->cycle_lock); | |
596 | ||
597 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
598 | lpcdev->membase = devm_ioremap_resource(dev, res); | |
599 | if (IS_ERR(lpcdev->membase)) | |
600 | return PTR_ERR(lpcdev->membase); | |
601 | ||
602 | range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL); | |
603 | if (!range) | |
604 | return -ENOMEM; | |
605 | ||
606 | range->fwnode = dev->fwnode; | |
607 | range->flags = LOGIC_PIO_INDIRECT; | |
608 | range->size = PIO_INDIRECT_SIZE; | |
609 | ||
610 | ret = logic_pio_register_range(range); | |
611 | if (ret) { | |
612 | dev_err(dev, "register IO range failed (%d)!\n", ret); | |
613 | return ret; | |
614 | } | |
615 | lpcdev->io_host = range; | |
616 | ||
617 | /* register the LPC host PIO resources */ | |
e0aa1563 JG |
618 | if (acpi_device) |
619 | ret = hisi_lpc_acpi_probe(dev); | |
620 | else | |
adf38bb0 | 621 | ret = of_platform_populate(dev->of_node, NULL, NULL, dev); |
e0aa1563 JG |
622 | if (ret) |
623 | return ret; | |
adf38bb0 ZY |
624 | |
625 | lpcdev->io_host->hostdata = lpcdev; | |
626 | lpcdev->io_host->ops = &hisi_lpc_ops; | |
627 | ||
628 | io_end = lpcdev->io_host->io_start + lpcdev->io_host->size; | |
629 | dev_info(dev, "registered range [%pa - %pa]\n", | |
630 | &lpcdev->io_host->io_start, &io_end); | |
631 | ||
632 | return ret; | |
633 | } | |
634 | ||
635 | static const struct of_device_id hisi_lpc_of_match[] = { | |
636 | { .compatible = "hisilicon,hip06-lpc", }, | |
637 | { .compatible = "hisilicon,hip07-lpc", }, | |
638 | {} | |
639 | }; | |
640 | ||
641 | static struct platform_driver hisi_lpc_driver = { | |
642 | .driver = { | |
643 | .name = DRV_NAME, | |
644 | .of_match_table = hisi_lpc_of_match, | |
e0aa1563 | 645 | .acpi_match_table = ACPI_PTR(hisi_lpc_acpi_match), |
adf38bb0 ZY |
646 | }, |
647 | .probe = hisi_lpc_probe, | |
648 | }; | |
649 | builtin_platform_driver(hisi_lpc_driver); |