Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * DDR PHY Front End (DPFE) driver for Broadcom set top box SoCs
4 *
5 * Copyright (c) 2017 Broadcom
6 */
7
8/*
9 * This driver provides access to the DPFE interface of Broadcom STB SoCs.
10 * The firmware running on the DCPU inside the DDR PHY can provide current
11 * information about the system's RAM, for instance the DRAM refresh rate.
12 * This can be used as an indirect indicator for the DRAM's temperature.
13 * Slower refresh rate means cooler RAM, higher refresh rate means hotter
14 * RAM.
15 *
16 * Throughout the driver, we use readl_relaxed() and writel_relaxed(), which
17 * already contain the appropriate le32_to_cpu()/cpu_to_le32() calls.
18 *
19 * Note regarding the loading of the firmware image: we use be32_to_cpu()
20 * and le_32_to_cpu(), so we can support the following four cases:
21 * - LE kernel + LE firmware image (the most common case)
22 * - LE kernel + BE firmware image
23 * - BE kernel + LE firmware image
24 * - BE kernel + BE firmware image
25 *
26 * The DPCU always runs in big endian mode. The firmware image, however, can
27 * be in either format. Also, communication between host CPU and DCPU is
28 * always in little endian.
29 */
30
31#include <linux/delay.h>
32#include <linux/firmware.h>
33#include <linux/io.h>
34#include <linux/module.h>
35#include <linux/of_address.h>
36#include <linux/of_device.h>
37#include <linux/platform_device.h>
38
39#define DRVNAME "brcmstb-dpfe"
40
41/* DCPU register offsets */
42#define REG_DCPU_RESET 0x0
43#define REG_TO_DCPU_MBOX 0x10
44#define REG_TO_HOST_MBOX 0x14
45
46/* Macros to process offsets returned by the DCPU */
47#define DRAM_MSG_ADDR_OFFSET 0x0
48#define DRAM_MSG_TYPE_OFFSET 0x1c
49#define DRAM_MSG_ADDR_MASK ((1UL << DRAM_MSG_TYPE_OFFSET) - 1)
50#define DRAM_MSG_TYPE_MASK ((1UL << \
51 (BITS_PER_LONG - DRAM_MSG_TYPE_OFFSET)) - 1)
52
53/* Message RAM */
54#define DCPU_MSG_RAM_START 0x100
55#define DCPU_MSG_RAM(x) (DCPU_MSG_RAM_START + (x) * sizeof(u32))
56
57/* DRAM Info Offsets & Masks */
58#define DRAM_INFO_INTERVAL 0x0
59#define DRAM_INFO_MR4 0x4
60#define DRAM_INFO_ERROR 0x8
61#define DRAM_INFO_MR4_MASK 0xff
62#define DRAM_INFO_MR4_SHIFT 24 /* We need to look at byte 3 */
63
64/* DRAM MR4 Offsets & Masks */
65#define DRAM_MR4_REFRESH 0x0 /* Refresh rate */
66#define DRAM_MR4_SR_ABORT 0x3 /* Self Refresh Abort */
67#define DRAM_MR4_PPRE 0x4 /* Post-package repair entry/exit */
68#define DRAM_MR4_TH_OFFS 0x5 /* Thermal Offset; vendor specific */
69#define DRAM_MR4_TUF 0x7 /* Temperature Update Flag */
70
71#define DRAM_MR4_REFRESH_MASK 0x7
72#define DRAM_MR4_SR_ABORT_MASK 0x1
73#define DRAM_MR4_PPRE_MASK 0x1
74#define DRAM_MR4_TH_OFFS_MASK 0x3
75#define DRAM_MR4_TUF_MASK 0x1
76
77/* DRAM Vendor Offsets & Masks (API v2) */
78#define DRAM_VENDOR_MR5 0x0
79#define DRAM_VENDOR_MR6 0x4
80#define DRAM_VENDOR_MR7 0x8
81#define DRAM_VENDOR_MR8 0xc
82#define DRAM_VENDOR_ERROR 0x10
83#define DRAM_VENDOR_MASK 0xff
84#define DRAM_VENDOR_SHIFT 24 /* We need to look at byte 3 */
85
86/* DRAM Information Offsets & Masks (API v3) */
87#define DRAM_DDR_INFO_MR4 0x0
88#define DRAM_DDR_INFO_MR5 0x4
89#define DRAM_DDR_INFO_MR6 0x8
90#define DRAM_DDR_INFO_MR7 0xc
91#define DRAM_DDR_INFO_MR8 0x10
92#define DRAM_DDR_INFO_ERROR 0x14
93#define DRAM_DDR_INFO_MASK 0xff
94
95/* Reset register bits & masks */
96#define DCPU_RESET_SHIFT 0x0
97#define DCPU_RESET_MASK 0x1
98#define DCPU_CLK_DISABLE_SHIFT 0x2
99
100/* DCPU return codes */
101#define DCPU_RET_ERROR_BIT BIT(31)
102#define DCPU_RET_SUCCESS 0x1
103#define DCPU_RET_ERR_HEADER (DCPU_RET_ERROR_BIT | BIT(0))
104#define DCPU_RET_ERR_INVAL (DCPU_RET_ERROR_BIT | BIT(1))
105#define DCPU_RET_ERR_CHKSUM (DCPU_RET_ERROR_BIT | BIT(2))
106#define DCPU_RET_ERR_COMMAND (DCPU_RET_ERROR_BIT | BIT(3))
107/* This error code is not firmware defined and only used in the driver. */
108#define DCPU_RET_ERR_TIMEDOUT (DCPU_RET_ERROR_BIT | BIT(4))
109
110/* Firmware magic */
111#define DPFE_BE_MAGIC 0xfe1010fe
112#define DPFE_LE_MAGIC 0xfe0101fe
113
114/* Error codes */
115#define ERR_INVALID_MAGIC -1
116#define ERR_INVALID_SIZE -2
117#define ERR_INVALID_CHKSUM -3
118
119/* Message types */
120#define DPFE_MSG_TYPE_COMMAND 1
121#define DPFE_MSG_TYPE_RESPONSE 2
122
123#define DELAY_LOOP_MAX 1000
124
125enum dpfe_msg_fields {
126 MSG_HEADER,
127 MSG_COMMAND,
128 MSG_ARG_COUNT,
129 MSG_ARG0,
130 MSG_FIELD_MAX = 16 /* Max number of arguments */
131};
132
133enum dpfe_commands {
134 DPFE_CMD_GET_INFO,
135 DPFE_CMD_GET_REFRESH,
136 DPFE_CMD_GET_VENDOR,
137 DPFE_CMD_MAX /* Last entry */
138};
139
140/*
141 * Format of the binary firmware file:
142 *
143 * entry
144 * 0 header
145 * value: 0xfe0101fe <== little endian
146 * 0xfe1010fe <== big endian
147 * 1 sequence:
148 * [31:16] total segments on this build
149 * [15:0] this segment sequence.
150 * 2 FW version
151 * 3 IMEM byte size
152 * 4 DMEM byte size
153 * IMEM
154 * DMEM
155 * last checksum ==> sum of everything
156 */
157struct dpfe_firmware_header {
158 u32 magic;
159 u32 sequence;
160 u32 version;
161 u32 imem_size;
162 u32 dmem_size;
163};
164
165/* Things we only need during initialization. */
166struct init_data {
167 unsigned int dmem_len;
168 unsigned int imem_len;
169 unsigned int chksum;
170 bool is_big_endian;
171};
172
173/* API version and corresponding commands */
174struct dpfe_api {
175 int version;
176 const char *fw_name;
177 const struct attribute_group **sysfs_attrs;
178 u32 command[DPFE_CMD_MAX][MSG_FIELD_MAX];
179};
180
181/* Things we need for as long as we are active. */
182struct brcmstb_dpfe_priv {
183 void __iomem *regs;
184 void __iomem *dmem;
185 void __iomem *imem;
186 struct device *dev;
187 const struct dpfe_api *dpfe_api;
188 struct mutex lock;
189};
190
191static const char * const error_text[] = {
192 "Success", "Header code incorrect", "Unknown command or argument",
193 "Incorrect checksum", "Malformed command", "Timed out",
194};
195
196/*
197 * Forward declaration of our sysfs attribute functions, so we can declare the
198 * attribute data structures early.
199 */
200static ssize_t show_info(struct device *, struct device_attribute *, char *);
201static ssize_t show_refresh(struct device *, struct device_attribute *, char *);
202static ssize_t store_refresh(struct device *, struct device_attribute *,
203 const char *, size_t);
204static ssize_t show_vendor(struct device *, struct device_attribute *, char *);
205static ssize_t show_dram(struct device *, struct device_attribute *, char *);
206
207/*
208 * Declare our attributes early, so they can be referenced in the API data
209 * structure. We need to do this, because the attributes depend on the API
210 * version.
211 */
212static DEVICE_ATTR(dpfe_info, 0444, show_info, NULL);
213static DEVICE_ATTR(dpfe_refresh, 0644, show_refresh, store_refresh);
214static DEVICE_ATTR(dpfe_vendor, 0444, show_vendor, NULL);
215static DEVICE_ATTR(dpfe_dram, 0444, show_dram, NULL);
216
217/* API v2 sysfs attributes */
218static struct attribute *dpfe_v2_attrs[] = {
219 &dev_attr_dpfe_info.attr,
220 &dev_attr_dpfe_refresh.attr,
221 &dev_attr_dpfe_vendor.attr,
222 NULL
223};
224ATTRIBUTE_GROUPS(dpfe_v2);
225
226/* API v3 sysfs attributes */
227static struct attribute *dpfe_v3_attrs[] = {
228 &dev_attr_dpfe_info.attr,
229 &dev_attr_dpfe_dram.attr,
230 NULL
231};
232ATTRIBUTE_GROUPS(dpfe_v3);
233
234/*
235 * Old API v2 firmware commands, as defined in the rev 0.61 specification, we
236 * use a version set to 1 to denote that it is not compatible with the new API
237 * v2 and onwards.
238 */
239static const struct dpfe_api dpfe_api_old_v2 = {
240 .version = 1,
241 .fw_name = "dpfe.bin",
242 .sysfs_attrs = dpfe_v2_groups,
243 .command = {
244 [DPFE_CMD_GET_INFO] = {
245 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
246 [MSG_COMMAND] = 1,
247 [MSG_ARG_COUNT] = 1,
248 [MSG_ARG0] = 1,
249 },
250 [DPFE_CMD_GET_REFRESH] = {
251 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
252 [MSG_COMMAND] = 2,
253 [MSG_ARG_COUNT] = 1,
254 [MSG_ARG0] = 1,
255 },
256 [DPFE_CMD_GET_VENDOR] = {
257 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
258 [MSG_COMMAND] = 2,
259 [MSG_ARG_COUNT] = 1,
260 [MSG_ARG0] = 2,
261 },
262 }
263};
264
265/*
266 * API v2 firmware commands, as defined in the rev 0.8 specification, named new
267 * v2 here
268 */
269static const struct dpfe_api dpfe_api_new_v2 = {
270 .version = 2,
271 .fw_name = NULL, /* We expect the firmware to have been downloaded! */
272 .sysfs_attrs = dpfe_v2_groups,
273 .command = {
274 [DPFE_CMD_GET_INFO] = {
275 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
276 [MSG_COMMAND] = 0x101,
277 },
278 [DPFE_CMD_GET_REFRESH] = {
279 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
280 [MSG_COMMAND] = 0x201,
281 },
282 [DPFE_CMD_GET_VENDOR] = {
283 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
284 [MSG_COMMAND] = 0x202,
285 },
286 }
287};
288
289/* API v3 firmware commands */
290static const struct dpfe_api dpfe_api_v3 = {
291 .version = 3,
292 .fw_name = NULL, /* We expect the firmware to have been downloaded! */
293 .sysfs_attrs = dpfe_v3_groups,
294 .command = {
295 [DPFE_CMD_GET_INFO] = {
296 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
297 [MSG_COMMAND] = 0x0101,
298 [MSG_ARG_COUNT] = 1,
299 [MSG_ARG0] = 1,
300 },
301 [DPFE_CMD_GET_REFRESH] = {
302 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
303 [MSG_COMMAND] = 0x0202,
304 [MSG_ARG_COUNT] = 0,
305 },
306 /* There's no GET_VENDOR command in API v3. */
307 },
308};
309
310static bool is_dcpu_enabled(struct brcmstb_dpfe_priv *priv)
311{
312 u32 val;
313
314 mutex_lock(&priv->lock);
315 val = readl_relaxed(priv->regs + REG_DCPU_RESET);
316 mutex_unlock(&priv->lock);
317
318 return !(val & DCPU_RESET_MASK);
319}
320
321static void __disable_dcpu(struct brcmstb_dpfe_priv *priv)
322{
323 u32 val;
324
325 if (!is_dcpu_enabled(priv))
326 return;
327
328 mutex_lock(&priv->lock);
329
330 /* Put DCPU in reset if it's running. */
331 val = readl_relaxed(priv->regs + REG_DCPU_RESET);
332 val |= (1 << DCPU_RESET_SHIFT);
333 writel_relaxed(val, priv->regs + REG_DCPU_RESET);
334
335 mutex_unlock(&priv->lock);
336}
337
338static void __enable_dcpu(struct brcmstb_dpfe_priv *priv)
339{
340 void __iomem *regs = priv->regs;
341 u32 val;
342
343 mutex_lock(&priv->lock);
344
345 /* Clear mailbox registers. */
346 writel_relaxed(0, regs + REG_TO_DCPU_MBOX);
347 writel_relaxed(0, regs + REG_TO_HOST_MBOX);
348
349 /* Disable DCPU clock gating */
350 val = readl_relaxed(regs + REG_DCPU_RESET);
351 val &= ~(1 << DCPU_CLK_DISABLE_SHIFT);
352 writel_relaxed(val, regs + REG_DCPU_RESET);
353
354 /* Take DCPU out of reset */
355 val = readl_relaxed(regs + REG_DCPU_RESET);
356 val &= ~(1 << DCPU_RESET_SHIFT);
357 writel_relaxed(val, regs + REG_DCPU_RESET);
358
359 mutex_unlock(&priv->lock);
360}
361
362static unsigned int get_msg_chksum(const u32 msg[], unsigned int max)
363{
364 unsigned int sum = 0;
365 unsigned int i;
366
367 /* Don't include the last field in the checksum. */
368 for (i = 0; i < max; i++)
369 sum += msg[i];
370
371 return sum;
372}
373
374static void __iomem *get_msg_ptr(struct brcmstb_dpfe_priv *priv, u32 response,
375 char *buf, ssize_t *size)
376{
377 unsigned int msg_type;
378 unsigned int offset;
379 void __iomem *ptr = NULL;
380
381 /* There is no need to use this function for API v3 or later. */
382 if (unlikely(priv->dpfe_api->version >= 3))
383 return NULL;
384
385 msg_type = (response >> DRAM_MSG_TYPE_OFFSET) & DRAM_MSG_TYPE_MASK;
386 offset = (response >> DRAM_MSG_ADDR_OFFSET) & DRAM_MSG_ADDR_MASK;
387
388 /*
389 * msg_type == 1: the offset is relative to the message RAM
390 * msg_type == 0: the offset is relative to the data RAM (this is the
391 * previous way of passing data)
392 * msg_type is anything else: there's critical hardware problem
393 */
394 switch (msg_type) {
395 case 1:
396 ptr = priv->regs + DCPU_MSG_RAM_START + offset;
397 break;
398 case 0:
399 ptr = priv->dmem + offset;
400 break;
401 default:
402 dev_emerg(priv->dev, "invalid message reply from DCPU: %#x\n",
403 response);
404 if (buf && size)
405 *size = sprintf(buf,
406 "FATAL: communication error with DCPU\n");
407 }
408
409 return ptr;
410}
411
412static void __finalize_command(struct brcmstb_dpfe_priv *priv)
413{
414 unsigned int release_mbox;
415
416 /*
417 * It depends on the API version which MBOX register we have to write to
418 * to signal we are done.
419 */
420 release_mbox = (priv->dpfe_api->version < 2)
421 ? REG_TO_HOST_MBOX : REG_TO_DCPU_MBOX;
422 writel_relaxed(0, priv->regs + release_mbox);
423}
424
425static int __send_command(struct brcmstb_dpfe_priv *priv, unsigned int cmd,
426 u32 result[])
427{
428 const u32 *msg = priv->dpfe_api->command[cmd];
429 void __iomem *regs = priv->regs;
430 unsigned int i, chksum, chksum_idx;
431 int ret = 0;
432 u32 resp;
433
434 if (cmd >= DPFE_CMD_MAX)
435 return -1;
436
437 mutex_lock(&priv->lock);
438
439 /* Wait for DCPU to become ready */
440 for (i = 0; i < DELAY_LOOP_MAX; i++) {
441 resp = readl_relaxed(regs + REG_TO_HOST_MBOX);
442 if (resp == 0)
443 break;
444 msleep(1);
445 }
446 if (resp != 0) {
447 mutex_unlock(&priv->lock);
448 return -ETIMEDOUT;
449 }
450
451 /* Compute checksum over the message */
452 chksum_idx = msg[MSG_ARG_COUNT] + MSG_ARG_COUNT + 1;
453 chksum = get_msg_chksum(msg, chksum_idx);
454
455 /* Write command and arguments to message area */
456 for (i = 0; i < MSG_FIELD_MAX; i++) {
457 if (i == chksum_idx)
458 writel_relaxed(chksum, regs + DCPU_MSG_RAM(i));
459 else
460 writel_relaxed(msg[i], regs + DCPU_MSG_RAM(i));
461 }
462
463 /* Tell DCPU there is a command waiting */
464 writel_relaxed(1, regs + REG_TO_DCPU_MBOX);
465
466 /* Wait for DCPU to process the command */
467 for (i = 0; i < DELAY_LOOP_MAX; i++) {
468 /* Read response code */
469 resp = readl_relaxed(regs + REG_TO_HOST_MBOX);
470 if (resp > 0)
471 break;
472 msleep(1);
473 }
474
475 if (i == DELAY_LOOP_MAX) {
476 resp = (DCPU_RET_ERR_TIMEDOUT & ~DCPU_RET_ERROR_BIT);
477 ret = -ffs(resp);
478 } else {
479 /* Read response data */
480 for (i = 0; i < MSG_FIELD_MAX; i++)
481 result[i] = readl_relaxed(regs + DCPU_MSG_RAM(i));
482 chksum_idx = result[MSG_ARG_COUNT] + MSG_ARG_COUNT + 1;
483 }
484
485 /* Tell DCPU we are done */
486 __finalize_command(priv);
487
488 mutex_unlock(&priv->lock);
489
490 if (ret)
491 return ret;
492
493 /* Verify response */
494 chksum = get_msg_chksum(result, chksum_idx);
495 if (chksum != result[chksum_idx])
496 resp = DCPU_RET_ERR_CHKSUM;
497
498 if (resp != DCPU_RET_SUCCESS) {
499 resp &= ~DCPU_RET_ERROR_BIT;
500 ret = -ffs(resp);
501 }
502
503 return ret;
504}
505
506/* Ensure that the firmware file loaded meets all the requirements. */
507static int __verify_firmware(struct init_data *init,
508 const struct firmware *fw)
509{
510 const struct dpfe_firmware_header *header = (void *)fw->data;
511 unsigned int dmem_size, imem_size, total_size;
512 bool is_big_endian = false;
513 const u32 *chksum_ptr;
514
515 if (header->magic == DPFE_BE_MAGIC)
516 is_big_endian = true;
517 else if (header->magic != DPFE_LE_MAGIC)
518 return ERR_INVALID_MAGIC;
519
520 if (is_big_endian) {
521 dmem_size = be32_to_cpu(header->dmem_size);
522 imem_size = be32_to_cpu(header->imem_size);
523 } else {
524 dmem_size = le32_to_cpu(header->dmem_size);
525 imem_size = le32_to_cpu(header->imem_size);
526 }
527
528 /* Data and instruction sections are 32 bit words. */
529 if ((dmem_size % sizeof(u32)) != 0 || (imem_size % sizeof(u32)) != 0)
530 return ERR_INVALID_SIZE;
531
532 /*
533 * The header + the data section + the instruction section + the
534 * checksum must be equal to the total firmware size.
535 */
536 total_size = dmem_size + imem_size + sizeof(*header) +
537 sizeof(*chksum_ptr);
538 if (total_size != fw->size)
539 return ERR_INVALID_SIZE;
540
541 /* The checksum comes at the very end. */
542 chksum_ptr = (void *)fw->data + sizeof(*header) + dmem_size + imem_size;
543
544 init->is_big_endian = is_big_endian;
545 init->dmem_len = dmem_size;
546 init->imem_len = imem_size;
547 init->chksum = (is_big_endian)
548 ? be32_to_cpu(*chksum_ptr) : le32_to_cpu(*chksum_ptr);
549
550 return 0;
551}
552
553/* Verify checksum by reading back the firmware from co-processor RAM. */
554static int __verify_fw_checksum(struct init_data *init,
555 struct brcmstb_dpfe_priv *priv,
556 const struct dpfe_firmware_header *header,
557 u32 checksum)
558{
559 u32 magic, sequence, version, sum;
560 u32 __iomem *dmem = priv->dmem;
561 u32 __iomem *imem = priv->imem;
562 unsigned int i;
563
564 if (init->is_big_endian) {
565 magic = be32_to_cpu(header->magic);
566 sequence = be32_to_cpu(header->sequence);
567 version = be32_to_cpu(header->version);
568 } else {
569 magic = le32_to_cpu(header->magic);
570 sequence = le32_to_cpu(header->sequence);
571 version = le32_to_cpu(header->version);
572 }
573
574 sum = magic + sequence + version + init->dmem_len + init->imem_len;
575
576 for (i = 0; i < init->dmem_len / sizeof(u32); i++)
577 sum += readl_relaxed(dmem + i);
578
579 for (i = 0; i < init->imem_len / sizeof(u32); i++)
580 sum += readl_relaxed(imem + i);
581
582 return (sum == checksum) ? 0 : -1;
583}
584
585static int __write_firmware(u32 __iomem *mem, const u32 *fw,
586 unsigned int size, bool is_big_endian)
587{
588 unsigned int i;
589
590 /* Convert size to 32-bit words. */
591 size /= sizeof(u32);
592
593 /* It is recommended to clear the firmware area first. */
594 for (i = 0; i < size; i++)
595 writel_relaxed(0, mem + i);
596
597 /* Now copy it. */
598 if (is_big_endian) {
599 for (i = 0; i < size; i++)
600 writel_relaxed(be32_to_cpu(fw[i]), mem + i);
601 } else {
602 for (i = 0; i < size; i++)
603 writel_relaxed(le32_to_cpu(fw[i]), mem + i);
604 }
605
606 return 0;
607}
608
609static int brcmstb_dpfe_download_firmware(struct brcmstb_dpfe_priv *priv)
610{
611 const struct dpfe_firmware_header *header;
612 unsigned int dmem_size, imem_size;
613 struct device *dev = priv->dev;
614 bool is_big_endian = false;
615 const struct firmware *fw;
616 const u32 *dmem, *imem;
617 struct init_data init;
618 const void *fw_blob;
619 int ret;
620
621 /*
622 * Skip downloading the firmware if the DCPU is already running and
623 * responding to commands.
624 */
625 if (is_dcpu_enabled(priv)) {
626 u32 response[MSG_FIELD_MAX];
627
628 ret = __send_command(priv, DPFE_CMD_GET_INFO, response);
629 if (!ret)
630 return 0;
631 }
632
633 /*
634 * If the firmware filename is NULL it means the boot firmware has to
635 * download the DCPU firmware for us. If that didn't work, we have to
636 * bail, since downloading it ourselves wouldn't work either.
637 */
638 if (!priv->dpfe_api->fw_name)
639 return -ENODEV;
640
641 ret = firmware_request_nowarn(&fw, priv->dpfe_api->fw_name, dev);
642 /*
643 * Defer the firmware download if the firmware file couldn't be found.
644 * The root file system may not be available yet.
645 */
646 if (ret)
647 return (ret == -ENOENT) ? -EPROBE_DEFER : ret;
648
649 ret = __verify_firmware(&init, fw);
650 if (ret)
651 return -EFAULT;
652
653 __disable_dcpu(priv);
654
655 is_big_endian = init.is_big_endian;
656 dmem_size = init.dmem_len;
657 imem_size = init.imem_len;
658
659 /* At the beginning of the firmware blob is a header. */
660 header = (struct dpfe_firmware_header *)fw->data;
661 /* Void pointer to the beginning of the actual firmware. */
662 fw_blob = fw->data + sizeof(*header);
663 /* IMEM comes right after the header. */
664 imem = fw_blob;
665 /* DMEM follows after IMEM. */
666 dmem = fw_blob + imem_size;
667
668 ret = __write_firmware(priv->dmem, dmem, dmem_size, is_big_endian);
669 if (ret)
670 return ret;
671 ret = __write_firmware(priv->imem, imem, imem_size, is_big_endian);
672 if (ret)
673 return ret;
674
675 ret = __verify_fw_checksum(&init, priv, header, init.chksum);
676 if (ret)
677 return ret;
678
679 __enable_dcpu(priv);
680
681 return 0;
682}
683
684static ssize_t generic_show(unsigned int command, u32 response[],
685 struct brcmstb_dpfe_priv *priv, char *buf)
686{
687 int ret;
688
689 if (!priv)
690 return sprintf(buf, "ERROR: driver private data not set\n");
691
692 ret = __send_command(priv, command, response);
693 if (ret < 0)
694 return sprintf(buf, "ERROR: %s\n", error_text[-ret]);
695
696 return 0;
697}
698
699static ssize_t show_info(struct device *dev, struct device_attribute *devattr,
700 char *buf)
701{
702 u32 response[MSG_FIELD_MAX];
703 struct brcmstb_dpfe_priv *priv;
704 unsigned int info;
705 ssize_t ret;
706
707 priv = dev_get_drvdata(dev);
708 ret = generic_show(DPFE_CMD_GET_INFO, response, priv, buf);
709 if (ret)
710 return ret;
711
712 info = response[MSG_ARG0];
713
714 return sprintf(buf, "%u.%u.%u.%u\n",
715 (info >> 24) & 0xff,
716 (info >> 16) & 0xff,
717 (info >> 8) & 0xff,
718 info & 0xff);
719}
720
721static ssize_t show_refresh(struct device *dev,
722 struct device_attribute *devattr, char *buf)
723{
724 u32 response[MSG_FIELD_MAX];
725 void __iomem *info;
726 struct brcmstb_dpfe_priv *priv;
727 u8 refresh, sr_abort, ppre, thermal_offs, tuf;
728 u32 mr4;
729 ssize_t ret;
730
731 priv = dev_get_drvdata(dev);
732 ret = generic_show(DPFE_CMD_GET_REFRESH, response, priv, buf);
733 if (ret)
734 return ret;
735
736 info = get_msg_ptr(priv, response[MSG_ARG0], buf, &ret);
737 if (!info)
738 return ret;
739
740 mr4 = (readl_relaxed(info + DRAM_INFO_MR4) >> DRAM_INFO_MR4_SHIFT) &
741 DRAM_INFO_MR4_MASK;
742
743 refresh = (mr4 >> DRAM_MR4_REFRESH) & DRAM_MR4_REFRESH_MASK;
744 sr_abort = (mr4 >> DRAM_MR4_SR_ABORT) & DRAM_MR4_SR_ABORT_MASK;
745 ppre = (mr4 >> DRAM_MR4_PPRE) & DRAM_MR4_PPRE_MASK;
746 thermal_offs = (mr4 >> DRAM_MR4_TH_OFFS) & DRAM_MR4_TH_OFFS_MASK;
747 tuf = (mr4 >> DRAM_MR4_TUF) & DRAM_MR4_TUF_MASK;
748
749 return sprintf(buf, "%#x %#x %#x %#x %#x %#x %#x\n",
750 readl_relaxed(info + DRAM_INFO_INTERVAL),
751 refresh, sr_abort, ppre, thermal_offs, tuf,
752 readl_relaxed(info + DRAM_INFO_ERROR));
753}
754
755static ssize_t store_refresh(struct device *dev, struct device_attribute *attr,
756 const char *buf, size_t count)
757{
758 u32 response[MSG_FIELD_MAX];
759 struct brcmstb_dpfe_priv *priv;
760 void __iomem *info;
761 unsigned long val;
762 int ret;
763
764 if (kstrtoul(buf, 0, &val) < 0)
765 return -EINVAL;
766
767 priv = dev_get_drvdata(dev);
768 ret = __send_command(priv, DPFE_CMD_GET_REFRESH, response);
769 if (ret)
770 return ret;
771
772 info = get_msg_ptr(priv, response[MSG_ARG0], NULL, NULL);
773 if (!info)
774 return -EIO;
775
776 writel_relaxed(val, info + DRAM_INFO_INTERVAL);
777
778 return count;
779}
780
781static ssize_t show_vendor(struct device *dev, struct device_attribute *devattr,
782 char *buf)
783{
784 u32 response[MSG_FIELD_MAX];
785 struct brcmstb_dpfe_priv *priv;
786 void __iomem *info;
787 ssize_t ret;
788 u32 mr5, mr6, mr7, mr8, err;
789
790 priv = dev_get_drvdata(dev);
791 ret = generic_show(DPFE_CMD_GET_VENDOR, response, priv, buf);
792 if (ret)
793 return ret;
794
795 info = get_msg_ptr(priv, response[MSG_ARG0], buf, &ret);
796 if (!info)
797 return ret;
798
799 mr5 = (readl_relaxed(info + DRAM_VENDOR_MR5) >> DRAM_VENDOR_SHIFT) &
800 DRAM_VENDOR_MASK;
801 mr6 = (readl_relaxed(info + DRAM_VENDOR_MR6) >> DRAM_VENDOR_SHIFT) &
802 DRAM_VENDOR_MASK;
803 mr7 = (readl_relaxed(info + DRAM_VENDOR_MR7) >> DRAM_VENDOR_SHIFT) &
804 DRAM_VENDOR_MASK;
805 mr8 = (readl_relaxed(info + DRAM_VENDOR_MR8) >> DRAM_VENDOR_SHIFT) &
806 DRAM_VENDOR_MASK;
807 err = readl_relaxed(info + DRAM_VENDOR_ERROR) & DRAM_VENDOR_MASK;
808
809 return sprintf(buf, "%#x %#x %#x %#x %#x\n", mr5, mr6, mr7, mr8, err);
810}
811
812static ssize_t show_dram(struct device *dev, struct device_attribute *devattr,
813 char *buf)
814{
815 u32 response[MSG_FIELD_MAX];
816 struct brcmstb_dpfe_priv *priv;
817 ssize_t ret;
818 u32 mr4, mr5, mr6, mr7, mr8, err;
819
820 priv = dev_get_drvdata(dev);
821 ret = generic_show(DPFE_CMD_GET_REFRESH, response, priv, buf);
822 if (ret)
823 return ret;
824
825 mr4 = response[MSG_ARG0 + 0] & DRAM_INFO_MR4_MASK;
826 mr5 = response[MSG_ARG0 + 1] & DRAM_DDR_INFO_MASK;
827 mr6 = response[MSG_ARG0 + 2] & DRAM_DDR_INFO_MASK;
828 mr7 = response[MSG_ARG0 + 3] & DRAM_DDR_INFO_MASK;
829 mr8 = response[MSG_ARG0 + 4] & DRAM_DDR_INFO_MASK;
830 err = response[MSG_ARG0 + 5] & DRAM_DDR_INFO_MASK;
831
832 return sprintf(buf, "%#x %#x %#x %#x %#x %#x\n", mr4, mr5, mr6, mr7,
833 mr8, err);
834}
835
836static int brcmstb_dpfe_resume(struct platform_device *pdev)
837{
838 struct brcmstb_dpfe_priv *priv = platform_get_drvdata(pdev);
839
840 return brcmstb_dpfe_download_firmware(priv);
841}
842
843static int brcmstb_dpfe_probe(struct platform_device *pdev)
844{
845 struct device *dev = &pdev->dev;
846 struct brcmstb_dpfe_priv *priv;
847 struct resource *res;
848 int ret;
849
850 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
851 if (!priv)
852 return -ENOMEM;
853
854 priv->dev = dev;
855
856 mutex_init(&priv->lock);
857 platform_set_drvdata(pdev, priv);
858
859 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dpfe-cpu");
860 priv->regs = devm_ioremap_resource(dev, res);
861 if (IS_ERR(priv->regs)) {
862 dev_err(dev, "couldn't map DCPU registers\n");
863 return -ENODEV;
864 }
865
866 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dpfe-dmem");
867 priv->dmem = devm_ioremap_resource(dev, res);
868 if (IS_ERR(priv->dmem)) {
869 dev_err(dev, "Couldn't map DCPU data memory\n");
870 return -ENOENT;
871 }
872
873 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dpfe-imem");
874 priv->imem = devm_ioremap_resource(dev, res);
875 if (IS_ERR(priv->imem)) {
876 dev_err(dev, "Couldn't map DCPU instruction memory\n");
877 return -ENOENT;
878 }
879
880 priv->dpfe_api = of_device_get_match_data(dev);
881 if (unlikely(!priv->dpfe_api)) {
882 /*
883 * It should be impossible to end up here, but to be safe we
884 * check anyway.
885 */
886 dev_err(dev, "Couldn't determine API\n");
887 return -ENOENT;
888 }
889
890 ret = brcmstb_dpfe_download_firmware(priv);
891 if (ret) {
892 if (ret != -EPROBE_DEFER)
893 dev_err(dev, "Couldn't download firmware -- %d\n", ret);
894 return ret;
895 }
896
897 ret = sysfs_create_groups(&pdev->dev.kobj, priv->dpfe_api->sysfs_attrs);
898 if (!ret)
899 dev_info(dev, "registered with API v%d.\n",
900 priv->dpfe_api->version);
901
902 return ret;
903}
904
905static int brcmstb_dpfe_remove(struct platform_device *pdev)
906{
907 struct brcmstb_dpfe_priv *priv = dev_get_drvdata(&pdev->dev);
908
909 sysfs_remove_groups(&pdev->dev.kobj, priv->dpfe_api->sysfs_attrs);
910
911 return 0;
912}
913
914static const struct of_device_id brcmstb_dpfe_of_match[] = {
915 /* Use legacy API v2 for a select number of chips */
916 { .compatible = "brcm,bcm7268-dpfe-cpu", .data = &dpfe_api_old_v2 },
917 { .compatible = "brcm,bcm7271-dpfe-cpu", .data = &dpfe_api_old_v2 },
918 { .compatible = "brcm,bcm7278-dpfe-cpu", .data = &dpfe_api_old_v2 },
919 { .compatible = "brcm,bcm7211-dpfe-cpu", .data = &dpfe_api_new_v2 },
920 /* API v3 is the default going forward */
921 { .compatible = "brcm,dpfe-cpu", .data = &dpfe_api_v3 },
922 {}
923};
924MODULE_DEVICE_TABLE(of, brcmstb_dpfe_of_match);
925
926static struct platform_driver brcmstb_dpfe_driver = {
927 .driver = {
928 .name = DRVNAME,
929 .of_match_table = brcmstb_dpfe_of_match,
930 },
931 .probe = brcmstb_dpfe_probe,
932 .remove = brcmstb_dpfe_remove,
933 .resume = brcmstb_dpfe_resume,
934};
935
936module_platform_driver(brcmstb_dpfe_driver);
937
938MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
939MODULE_DESCRIPTION("BRCMSTB DDR PHY Front End Driver");
940MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * DDR PHY Front End (DPFE) driver for Broadcom set top box SoCs
4 *
5 * Copyright (c) 2017 Broadcom
6 */
7
8/*
9 * This driver provides access to the DPFE interface of Broadcom STB SoCs.
10 * The firmware running on the DCPU inside the DDR PHY can provide current
11 * information about the system's RAM, for instance the DRAM refresh rate.
12 * This can be used as an indirect indicator for the DRAM's temperature.
13 * Slower refresh rate means cooler RAM, higher refresh rate means hotter
14 * RAM.
15 *
16 * Throughout the driver, we use readl_relaxed() and writel_relaxed(), which
17 * already contain the appropriate le32_to_cpu()/cpu_to_le32() calls.
18 *
19 * Note regarding the loading of the firmware image: we use be32_to_cpu()
20 * and le_32_to_cpu(), so we can support the following four cases:
21 * - LE kernel + LE firmware image (the most common case)
22 * - LE kernel + BE firmware image
23 * - BE kernel + LE firmware image
24 * - BE kernel + BE firmware image
25 *
26 * The DPCU always runs in big endian mode. The firwmare image, however, can
27 * be in either format. Also, communication between host CPU and DCPU is
28 * always in little endian.
29 */
30
31#include <linux/delay.h>
32#include <linux/firmware.h>
33#include <linux/io.h>
34#include <linux/module.h>
35#include <linux/of_address.h>
36#include <linux/of_device.h>
37#include <linux/platform_device.h>
38
39#define DRVNAME "brcmstb-dpfe"
40
41/* DCPU register offsets */
42#define REG_DCPU_RESET 0x0
43#define REG_TO_DCPU_MBOX 0x10
44#define REG_TO_HOST_MBOX 0x14
45
46/* Macros to process offsets returned by the DCPU */
47#define DRAM_MSG_ADDR_OFFSET 0x0
48#define DRAM_MSG_TYPE_OFFSET 0x1c
49#define DRAM_MSG_ADDR_MASK ((1UL << DRAM_MSG_TYPE_OFFSET) - 1)
50#define DRAM_MSG_TYPE_MASK ((1UL << \
51 (BITS_PER_LONG - DRAM_MSG_TYPE_OFFSET)) - 1)
52
53/* Message RAM */
54#define DCPU_MSG_RAM_START 0x100
55#define DCPU_MSG_RAM(x) (DCPU_MSG_RAM_START + (x) * sizeof(u32))
56
57/* DRAM Info Offsets & Masks */
58#define DRAM_INFO_INTERVAL 0x0
59#define DRAM_INFO_MR4 0x4
60#define DRAM_INFO_ERROR 0x8
61#define DRAM_INFO_MR4_MASK 0xff
62#define DRAM_INFO_MR4_SHIFT 24 /* We need to look at byte 3 */
63
64/* DRAM MR4 Offsets & Masks */
65#define DRAM_MR4_REFRESH 0x0 /* Refresh rate */
66#define DRAM_MR4_SR_ABORT 0x3 /* Self Refresh Abort */
67#define DRAM_MR4_PPRE 0x4 /* Post-package repair entry/exit */
68#define DRAM_MR4_TH_OFFS 0x5 /* Thermal Offset; vendor specific */
69#define DRAM_MR4_TUF 0x7 /* Temperature Update Flag */
70
71#define DRAM_MR4_REFRESH_MASK 0x7
72#define DRAM_MR4_SR_ABORT_MASK 0x1
73#define DRAM_MR4_PPRE_MASK 0x1
74#define DRAM_MR4_TH_OFFS_MASK 0x3
75#define DRAM_MR4_TUF_MASK 0x1
76
77/* DRAM Vendor Offsets & Masks (API v2) */
78#define DRAM_VENDOR_MR5 0x0
79#define DRAM_VENDOR_MR6 0x4
80#define DRAM_VENDOR_MR7 0x8
81#define DRAM_VENDOR_MR8 0xc
82#define DRAM_VENDOR_ERROR 0x10
83#define DRAM_VENDOR_MASK 0xff
84#define DRAM_VENDOR_SHIFT 24 /* We need to look at byte 3 */
85
86/* DRAM Information Offsets & Masks (API v3) */
87#define DRAM_DDR_INFO_MR4 0x0
88#define DRAM_DDR_INFO_MR5 0x4
89#define DRAM_DDR_INFO_MR6 0x8
90#define DRAM_DDR_INFO_MR7 0xc
91#define DRAM_DDR_INFO_MR8 0x10
92#define DRAM_DDR_INFO_ERROR 0x14
93#define DRAM_DDR_INFO_MASK 0xff
94
95/* Reset register bits & masks */
96#define DCPU_RESET_SHIFT 0x0
97#define DCPU_RESET_MASK 0x1
98#define DCPU_CLK_DISABLE_SHIFT 0x2
99
100/* DCPU return codes */
101#define DCPU_RET_ERROR_BIT BIT(31)
102#define DCPU_RET_SUCCESS 0x1
103#define DCPU_RET_ERR_HEADER (DCPU_RET_ERROR_BIT | BIT(0))
104#define DCPU_RET_ERR_INVAL (DCPU_RET_ERROR_BIT | BIT(1))
105#define DCPU_RET_ERR_CHKSUM (DCPU_RET_ERROR_BIT | BIT(2))
106#define DCPU_RET_ERR_COMMAND (DCPU_RET_ERROR_BIT | BIT(3))
107/* This error code is not firmware defined and only used in the driver. */
108#define DCPU_RET_ERR_TIMEDOUT (DCPU_RET_ERROR_BIT | BIT(4))
109
110/* Firmware magic */
111#define DPFE_BE_MAGIC 0xfe1010fe
112#define DPFE_LE_MAGIC 0xfe0101fe
113
114/* Error codes */
115#define ERR_INVALID_MAGIC -1
116#define ERR_INVALID_SIZE -2
117#define ERR_INVALID_CHKSUM -3
118
119/* Message types */
120#define DPFE_MSG_TYPE_COMMAND 1
121#define DPFE_MSG_TYPE_RESPONSE 2
122
123#define DELAY_LOOP_MAX 1000
124
125enum dpfe_msg_fields {
126 MSG_HEADER,
127 MSG_COMMAND,
128 MSG_ARG_COUNT,
129 MSG_ARG0,
130 MSG_CHKSUM,
131 MSG_FIELD_MAX = 16 /* Max number of arguments */
132};
133
134enum dpfe_commands {
135 DPFE_CMD_GET_INFO,
136 DPFE_CMD_GET_REFRESH,
137 DPFE_CMD_GET_VENDOR,
138 DPFE_CMD_MAX /* Last entry */
139};
140
141/*
142 * Format of the binary firmware file:
143 *
144 * entry
145 * 0 header
146 * value: 0xfe0101fe <== little endian
147 * 0xfe1010fe <== big endian
148 * 1 sequence:
149 * [31:16] total segments on this build
150 * [15:0] this segment sequence.
151 * 2 FW version
152 * 3 IMEM byte size
153 * 4 DMEM byte size
154 * IMEM
155 * DMEM
156 * last checksum ==> sum of everything
157 */
158struct dpfe_firmware_header {
159 u32 magic;
160 u32 sequence;
161 u32 version;
162 u32 imem_size;
163 u32 dmem_size;
164};
165
166/* Things we only need during initialization. */
167struct init_data {
168 unsigned int dmem_len;
169 unsigned int imem_len;
170 unsigned int chksum;
171 bool is_big_endian;
172};
173
174/* API version and corresponding commands */
175struct dpfe_api {
176 int version;
177 const char *fw_name;
178 const struct attribute_group **sysfs_attrs;
179 u32 command[DPFE_CMD_MAX][MSG_FIELD_MAX];
180};
181
182/* Things we need for as long as we are active. */
183struct private_data {
184 void __iomem *regs;
185 void __iomem *dmem;
186 void __iomem *imem;
187 struct device *dev;
188 const struct dpfe_api *dpfe_api;
189 struct mutex lock;
190};
191
192static const char *error_text[] = {
193 "Success", "Header code incorrect", "Unknown command or argument",
194 "Incorrect checksum", "Malformed command", "Timed out",
195};
196
197/*
198 * Forward declaration of our sysfs attribute functions, so we can declare the
199 * attribute data structures early.
200 */
201static ssize_t show_info(struct device *, struct device_attribute *, char *);
202static ssize_t show_refresh(struct device *, struct device_attribute *, char *);
203static ssize_t store_refresh(struct device *, struct device_attribute *,
204 const char *, size_t);
205static ssize_t show_vendor(struct device *, struct device_attribute *, char *);
206static ssize_t show_dram(struct device *, struct device_attribute *, char *);
207
208/*
209 * Declare our attributes early, so they can be referenced in the API data
210 * structure. We need to do this, because the attributes depend on the API
211 * version.
212 */
213static DEVICE_ATTR(dpfe_info, 0444, show_info, NULL);
214static DEVICE_ATTR(dpfe_refresh, 0644, show_refresh, store_refresh);
215static DEVICE_ATTR(dpfe_vendor, 0444, show_vendor, NULL);
216static DEVICE_ATTR(dpfe_dram, 0444, show_dram, NULL);
217
218/* API v2 sysfs attributes */
219static struct attribute *dpfe_v2_attrs[] = {
220 &dev_attr_dpfe_info.attr,
221 &dev_attr_dpfe_refresh.attr,
222 &dev_attr_dpfe_vendor.attr,
223 NULL
224};
225ATTRIBUTE_GROUPS(dpfe_v2);
226
227/* API v3 sysfs attributes */
228static struct attribute *dpfe_v3_attrs[] = {
229 &dev_attr_dpfe_info.attr,
230 &dev_attr_dpfe_dram.attr,
231 NULL
232};
233ATTRIBUTE_GROUPS(dpfe_v3);
234
235/* API v2 firmware commands */
236static const struct dpfe_api dpfe_api_v2 = {
237 .version = 2,
238 .fw_name = "dpfe.bin",
239 .sysfs_attrs = dpfe_v2_groups,
240 .command = {
241 [DPFE_CMD_GET_INFO] = {
242 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
243 [MSG_COMMAND] = 1,
244 [MSG_ARG_COUNT] = 1,
245 [MSG_ARG0] = 1,
246 [MSG_CHKSUM] = 4,
247 },
248 [DPFE_CMD_GET_REFRESH] = {
249 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
250 [MSG_COMMAND] = 2,
251 [MSG_ARG_COUNT] = 1,
252 [MSG_ARG0] = 1,
253 [MSG_CHKSUM] = 5,
254 },
255 [DPFE_CMD_GET_VENDOR] = {
256 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
257 [MSG_COMMAND] = 2,
258 [MSG_ARG_COUNT] = 1,
259 [MSG_ARG0] = 2,
260 [MSG_CHKSUM] = 6,
261 },
262 }
263};
264
265/* API v3 firmware commands */
266static const struct dpfe_api dpfe_api_v3 = {
267 .version = 3,
268 .fw_name = NULL, /* We expect the firmware to have been downloaded! */
269 .sysfs_attrs = dpfe_v3_groups,
270 .command = {
271 [DPFE_CMD_GET_INFO] = {
272 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
273 [MSG_COMMAND] = 0x0101,
274 [MSG_ARG_COUNT] = 1,
275 [MSG_ARG0] = 1,
276 [MSG_CHKSUM] = 0x104,
277 },
278 [DPFE_CMD_GET_REFRESH] = {
279 [MSG_HEADER] = DPFE_MSG_TYPE_COMMAND,
280 [MSG_COMMAND] = 0x0202,
281 [MSG_ARG_COUNT] = 0,
282 /*
283 * This is a bit ugly. Without arguments, the checksum
284 * follows right after the argument count and not at
285 * offset MSG_CHKSUM.
286 */
287 [MSG_ARG0] = 0x203,
288 },
289 /* There's no GET_VENDOR command in API v3. */
290 },
291};
292
293static bool is_dcpu_enabled(void __iomem *regs)
294{
295 u32 val;
296
297 val = readl_relaxed(regs + REG_DCPU_RESET);
298
299 return !(val & DCPU_RESET_MASK);
300}
301
302static void __disable_dcpu(void __iomem *regs)
303{
304 u32 val;
305
306 if (!is_dcpu_enabled(regs))
307 return;
308
309 /* Put DCPU in reset if it's running. */
310 val = readl_relaxed(regs + REG_DCPU_RESET);
311 val |= (1 << DCPU_RESET_SHIFT);
312 writel_relaxed(val, regs + REG_DCPU_RESET);
313}
314
315static void __enable_dcpu(void __iomem *regs)
316{
317 u32 val;
318
319 /* Clear mailbox registers. */
320 writel_relaxed(0, regs + REG_TO_DCPU_MBOX);
321 writel_relaxed(0, regs + REG_TO_HOST_MBOX);
322
323 /* Disable DCPU clock gating */
324 val = readl_relaxed(regs + REG_DCPU_RESET);
325 val &= ~(1 << DCPU_CLK_DISABLE_SHIFT);
326 writel_relaxed(val, regs + REG_DCPU_RESET);
327
328 /* Take DCPU out of reset */
329 val = readl_relaxed(regs + REG_DCPU_RESET);
330 val &= ~(1 << DCPU_RESET_SHIFT);
331 writel_relaxed(val, regs + REG_DCPU_RESET);
332}
333
334static unsigned int get_msg_chksum(const u32 msg[], unsigned int max)
335{
336 unsigned int sum = 0;
337 unsigned int i;
338
339 /* Don't include the last field in the checksum. */
340 for (i = 0; i < max; i++)
341 sum += msg[i];
342
343 return sum;
344}
345
346static void __iomem *get_msg_ptr(struct private_data *priv, u32 response,
347 char *buf, ssize_t *size)
348{
349 unsigned int msg_type;
350 unsigned int offset;
351 void __iomem *ptr = NULL;
352
353 /* There is no need to use this function for API v3 or later. */
354 if (unlikely(priv->dpfe_api->version >= 3)) {
355 return NULL;
356 }
357
358 msg_type = (response >> DRAM_MSG_TYPE_OFFSET) & DRAM_MSG_TYPE_MASK;
359 offset = (response >> DRAM_MSG_ADDR_OFFSET) & DRAM_MSG_ADDR_MASK;
360
361 /*
362 * msg_type == 1: the offset is relative to the message RAM
363 * msg_type == 0: the offset is relative to the data RAM (this is the
364 * previous way of passing data)
365 * msg_type is anything else: there's critical hardware problem
366 */
367 switch (msg_type) {
368 case 1:
369 ptr = priv->regs + DCPU_MSG_RAM_START + offset;
370 break;
371 case 0:
372 ptr = priv->dmem + offset;
373 break;
374 default:
375 dev_emerg(priv->dev, "invalid message reply from DCPU: %#x\n",
376 response);
377 if (buf && size)
378 *size = sprintf(buf,
379 "FATAL: communication error with DCPU\n");
380 }
381
382 return ptr;
383}
384
385static void __finalize_command(struct private_data *priv)
386{
387 unsigned int release_mbox;
388
389 /*
390 * It depends on the API version which MBOX register we have to write to
391 * to signal we are done.
392 */
393 release_mbox = (priv->dpfe_api->version < 3)
394 ? REG_TO_HOST_MBOX : REG_TO_DCPU_MBOX;
395 writel_relaxed(0, priv->regs + release_mbox);
396}
397
398static int __send_command(struct private_data *priv, unsigned int cmd,
399 u32 result[])
400{
401 const u32 *msg = priv->dpfe_api->command[cmd];
402 void __iomem *regs = priv->regs;
403 unsigned int i, chksum, chksum_idx;
404 int ret = 0;
405 u32 resp;
406
407 if (cmd >= DPFE_CMD_MAX)
408 return -1;
409
410 mutex_lock(&priv->lock);
411
412 /* Wait for DCPU to become ready */
413 for (i = 0; i < DELAY_LOOP_MAX; i++) {
414 resp = readl_relaxed(regs + REG_TO_HOST_MBOX);
415 if (resp == 0)
416 break;
417 msleep(1);
418 }
419 if (resp != 0) {
420 mutex_unlock(&priv->lock);
421 return -ETIMEDOUT;
422 }
423
424 /* Write command and arguments to message area */
425 for (i = 0; i < MSG_FIELD_MAX; i++)
426 writel_relaxed(msg[i], regs + DCPU_MSG_RAM(i));
427
428 /* Tell DCPU there is a command waiting */
429 writel_relaxed(1, regs + REG_TO_DCPU_MBOX);
430
431 /* Wait for DCPU to process the command */
432 for (i = 0; i < DELAY_LOOP_MAX; i++) {
433 /* Read response code */
434 resp = readl_relaxed(regs + REG_TO_HOST_MBOX);
435 if (resp > 0)
436 break;
437 msleep(1);
438 }
439
440 if (i == DELAY_LOOP_MAX) {
441 resp = (DCPU_RET_ERR_TIMEDOUT & ~DCPU_RET_ERROR_BIT);
442 ret = -ffs(resp);
443 } else {
444 /* Read response data */
445 for (i = 0; i < MSG_FIELD_MAX; i++)
446 result[i] = readl_relaxed(regs + DCPU_MSG_RAM(i));
447 chksum_idx = result[MSG_ARG_COUNT] + MSG_ARG_COUNT + 1;
448 }
449
450 /* Tell DCPU we are done */
451 __finalize_command(priv);
452
453 mutex_unlock(&priv->lock);
454
455 if (ret)
456 return ret;
457
458 /* Verify response */
459 chksum = get_msg_chksum(result, chksum_idx);
460 if (chksum != result[chksum_idx])
461 resp = DCPU_RET_ERR_CHKSUM;
462
463 if (resp != DCPU_RET_SUCCESS) {
464 resp &= ~DCPU_RET_ERROR_BIT;
465 ret = -ffs(resp);
466 }
467
468 return ret;
469}
470
471/* Ensure that the firmware file loaded meets all the requirements. */
472static int __verify_firmware(struct init_data *init,
473 const struct firmware *fw)
474{
475 const struct dpfe_firmware_header *header = (void *)fw->data;
476 unsigned int dmem_size, imem_size, total_size;
477 bool is_big_endian = false;
478 const u32 *chksum_ptr;
479
480 if (header->magic == DPFE_BE_MAGIC)
481 is_big_endian = true;
482 else if (header->magic != DPFE_LE_MAGIC)
483 return ERR_INVALID_MAGIC;
484
485 if (is_big_endian) {
486 dmem_size = be32_to_cpu(header->dmem_size);
487 imem_size = be32_to_cpu(header->imem_size);
488 } else {
489 dmem_size = le32_to_cpu(header->dmem_size);
490 imem_size = le32_to_cpu(header->imem_size);
491 }
492
493 /* Data and instruction sections are 32 bit words. */
494 if ((dmem_size % sizeof(u32)) != 0 || (imem_size % sizeof(u32)) != 0)
495 return ERR_INVALID_SIZE;
496
497 /*
498 * The header + the data section + the instruction section + the
499 * checksum must be equal to the total firmware size.
500 */
501 total_size = dmem_size + imem_size + sizeof(*header) +
502 sizeof(*chksum_ptr);
503 if (total_size != fw->size)
504 return ERR_INVALID_SIZE;
505
506 /* The checksum comes at the very end. */
507 chksum_ptr = (void *)fw->data + sizeof(*header) + dmem_size + imem_size;
508
509 init->is_big_endian = is_big_endian;
510 init->dmem_len = dmem_size;
511 init->imem_len = imem_size;
512 init->chksum = (is_big_endian)
513 ? be32_to_cpu(*chksum_ptr) : le32_to_cpu(*chksum_ptr);
514
515 return 0;
516}
517
518/* Verify checksum by reading back the firmware from co-processor RAM. */
519static int __verify_fw_checksum(struct init_data *init,
520 struct private_data *priv,
521 const struct dpfe_firmware_header *header,
522 u32 checksum)
523{
524 u32 magic, sequence, version, sum;
525 u32 __iomem *dmem = priv->dmem;
526 u32 __iomem *imem = priv->imem;
527 unsigned int i;
528
529 if (init->is_big_endian) {
530 magic = be32_to_cpu(header->magic);
531 sequence = be32_to_cpu(header->sequence);
532 version = be32_to_cpu(header->version);
533 } else {
534 magic = le32_to_cpu(header->magic);
535 sequence = le32_to_cpu(header->sequence);
536 version = le32_to_cpu(header->version);
537 }
538
539 sum = magic + sequence + version + init->dmem_len + init->imem_len;
540
541 for (i = 0; i < init->dmem_len / sizeof(u32); i++)
542 sum += readl_relaxed(dmem + i);
543
544 for (i = 0; i < init->imem_len / sizeof(u32); i++)
545 sum += readl_relaxed(imem + i);
546
547 return (sum == checksum) ? 0 : -1;
548}
549
550static int __write_firmware(u32 __iomem *mem, const u32 *fw,
551 unsigned int size, bool is_big_endian)
552{
553 unsigned int i;
554
555 /* Convert size to 32-bit words. */
556 size /= sizeof(u32);
557
558 /* It is recommended to clear the firmware area first. */
559 for (i = 0; i < size; i++)
560 writel_relaxed(0, mem + i);
561
562 /* Now copy it. */
563 if (is_big_endian) {
564 for (i = 0; i < size; i++)
565 writel_relaxed(be32_to_cpu(fw[i]), mem + i);
566 } else {
567 for (i = 0; i < size; i++)
568 writel_relaxed(le32_to_cpu(fw[i]), mem + i);
569 }
570
571 return 0;
572}
573
574static int brcmstb_dpfe_download_firmware(struct platform_device *pdev,
575 struct init_data *init)
576{
577 const struct dpfe_firmware_header *header;
578 unsigned int dmem_size, imem_size;
579 struct device *dev = &pdev->dev;
580 bool is_big_endian = false;
581 struct private_data *priv;
582 const struct firmware *fw;
583 const u32 *dmem, *imem;
584 const void *fw_blob;
585 int ret;
586
587 priv = platform_get_drvdata(pdev);
588
589 /*
590 * Skip downloading the firmware if the DCPU is already running and
591 * responding to commands.
592 */
593 if (is_dcpu_enabled(priv->regs)) {
594 u32 response[MSG_FIELD_MAX];
595
596 ret = __send_command(priv, DPFE_CMD_GET_INFO, response);
597 if (!ret)
598 return 0;
599 }
600
601 /*
602 * If the firmware filename is NULL it means the boot firmware has to
603 * download the DCPU firmware for us. If that didn't work, we have to
604 * bail, since downloading it ourselves wouldn't work either.
605 */
606 if (!priv->dpfe_api->fw_name)
607 return -ENODEV;
608
609 ret = request_firmware(&fw, priv->dpfe_api->fw_name, dev);
610 /* request_firmware() prints its own error messages. */
611 if (ret)
612 return ret;
613
614 ret = __verify_firmware(init, fw);
615 if (ret)
616 return -EFAULT;
617
618 __disable_dcpu(priv->regs);
619
620 is_big_endian = init->is_big_endian;
621 dmem_size = init->dmem_len;
622 imem_size = init->imem_len;
623
624 /* At the beginning of the firmware blob is a header. */
625 header = (struct dpfe_firmware_header *)fw->data;
626 /* Void pointer to the beginning of the actual firmware. */
627 fw_blob = fw->data + sizeof(*header);
628 /* IMEM comes right after the header. */
629 imem = fw_blob;
630 /* DMEM follows after IMEM. */
631 dmem = fw_blob + imem_size;
632
633 ret = __write_firmware(priv->dmem, dmem, dmem_size, is_big_endian);
634 if (ret)
635 return ret;
636 ret = __write_firmware(priv->imem, imem, imem_size, is_big_endian);
637 if (ret)
638 return ret;
639
640 ret = __verify_fw_checksum(init, priv, header, init->chksum);
641 if (ret)
642 return ret;
643
644 __enable_dcpu(priv->regs);
645
646 return 0;
647}
648
649static ssize_t generic_show(unsigned int command, u32 response[],
650 struct private_data *priv, char *buf)
651{
652 int ret;
653
654 if (!priv)
655 return sprintf(buf, "ERROR: driver private data not set\n");
656
657 ret = __send_command(priv, command, response);
658 if (ret < 0)
659 return sprintf(buf, "ERROR: %s\n", error_text[-ret]);
660
661 return 0;
662}
663
664static ssize_t show_info(struct device *dev, struct device_attribute *devattr,
665 char *buf)
666{
667 u32 response[MSG_FIELD_MAX];
668 struct private_data *priv;
669 unsigned int info;
670 ssize_t ret;
671
672 priv = dev_get_drvdata(dev);
673 ret = generic_show(DPFE_CMD_GET_INFO, response, priv, buf);
674 if (ret)
675 return ret;
676
677 info = response[MSG_ARG0];
678
679 return sprintf(buf, "%u.%u.%u.%u\n",
680 (info >> 24) & 0xff,
681 (info >> 16) & 0xff,
682 (info >> 8) & 0xff,
683 info & 0xff);
684}
685
686static ssize_t show_refresh(struct device *dev,
687 struct device_attribute *devattr, char *buf)
688{
689 u32 response[MSG_FIELD_MAX];
690 void __iomem *info;
691 struct private_data *priv;
692 u8 refresh, sr_abort, ppre, thermal_offs, tuf;
693 u32 mr4;
694 ssize_t ret;
695
696 priv = dev_get_drvdata(dev);
697 ret = generic_show(DPFE_CMD_GET_REFRESH, response, priv, buf);
698 if (ret)
699 return ret;
700
701 info = get_msg_ptr(priv, response[MSG_ARG0], buf, &ret);
702 if (!info)
703 return ret;
704
705 mr4 = (readl_relaxed(info + DRAM_INFO_MR4) >> DRAM_INFO_MR4_SHIFT) &
706 DRAM_INFO_MR4_MASK;
707
708 refresh = (mr4 >> DRAM_MR4_REFRESH) & DRAM_MR4_REFRESH_MASK;
709 sr_abort = (mr4 >> DRAM_MR4_SR_ABORT) & DRAM_MR4_SR_ABORT_MASK;
710 ppre = (mr4 >> DRAM_MR4_PPRE) & DRAM_MR4_PPRE_MASK;
711 thermal_offs = (mr4 >> DRAM_MR4_TH_OFFS) & DRAM_MR4_TH_OFFS_MASK;
712 tuf = (mr4 >> DRAM_MR4_TUF) & DRAM_MR4_TUF_MASK;
713
714 return sprintf(buf, "%#x %#x %#x %#x %#x %#x %#x\n",
715 readl_relaxed(info + DRAM_INFO_INTERVAL),
716 refresh, sr_abort, ppre, thermal_offs, tuf,
717 readl_relaxed(info + DRAM_INFO_ERROR));
718}
719
720static ssize_t store_refresh(struct device *dev, struct device_attribute *attr,
721 const char *buf, size_t count)
722{
723 u32 response[MSG_FIELD_MAX];
724 struct private_data *priv;
725 void __iomem *info;
726 unsigned long val;
727 int ret;
728
729 if (kstrtoul(buf, 0, &val) < 0)
730 return -EINVAL;
731
732 priv = dev_get_drvdata(dev);
733 ret = __send_command(priv, DPFE_CMD_GET_REFRESH, response);
734 if (ret)
735 return ret;
736
737 info = get_msg_ptr(priv, response[MSG_ARG0], NULL, NULL);
738 if (!info)
739 return -EIO;
740
741 writel_relaxed(val, info + DRAM_INFO_INTERVAL);
742
743 return count;
744}
745
746static ssize_t show_vendor(struct device *dev, struct device_attribute *devattr,
747 char *buf)
748{
749 u32 response[MSG_FIELD_MAX];
750 struct private_data *priv;
751 void __iomem *info;
752 ssize_t ret;
753 u32 mr5, mr6, mr7, mr8, err;
754
755 priv = dev_get_drvdata(dev);
756 ret = generic_show(DPFE_CMD_GET_VENDOR, response, priv, buf);
757 if (ret)
758 return ret;
759
760 info = get_msg_ptr(priv, response[MSG_ARG0], buf, &ret);
761 if (!info)
762 return ret;
763
764 mr5 = (readl_relaxed(info + DRAM_VENDOR_MR5) >> DRAM_VENDOR_SHIFT) &
765 DRAM_VENDOR_MASK;
766 mr6 = (readl_relaxed(info + DRAM_VENDOR_MR6) >> DRAM_VENDOR_SHIFT) &
767 DRAM_VENDOR_MASK;
768 mr7 = (readl_relaxed(info + DRAM_VENDOR_MR7) >> DRAM_VENDOR_SHIFT) &
769 DRAM_VENDOR_MASK;
770 mr8 = (readl_relaxed(info + DRAM_VENDOR_MR8) >> DRAM_VENDOR_SHIFT) &
771 DRAM_VENDOR_MASK;
772 err = readl_relaxed(info + DRAM_VENDOR_ERROR) & DRAM_VENDOR_MASK;
773
774 return sprintf(buf, "%#x %#x %#x %#x %#x\n", mr5, mr6, mr7, mr8, err);
775}
776
777static ssize_t show_dram(struct device *dev, struct device_attribute *devattr,
778 char *buf)
779{
780 u32 response[MSG_FIELD_MAX];
781 struct private_data *priv;
782 ssize_t ret;
783 u32 mr4, mr5, mr6, mr7, mr8, err;
784
785 priv = dev_get_drvdata(dev);
786 ret = generic_show(DPFE_CMD_GET_REFRESH, response, priv, buf);
787 if (ret)
788 return ret;
789
790 mr4 = response[MSG_ARG0 + 0] & DRAM_INFO_MR4_MASK;
791 mr5 = response[MSG_ARG0 + 1] & DRAM_DDR_INFO_MASK;
792 mr6 = response[MSG_ARG0 + 2] & DRAM_DDR_INFO_MASK;
793 mr7 = response[MSG_ARG0 + 3] & DRAM_DDR_INFO_MASK;
794 mr8 = response[MSG_ARG0 + 4] & DRAM_DDR_INFO_MASK;
795 err = response[MSG_ARG0 + 5] & DRAM_DDR_INFO_MASK;
796
797 return sprintf(buf, "%#x %#x %#x %#x %#x %#x\n", mr4, mr5, mr6, mr7,
798 mr8, err);
799}
800
801static int brcmstb_dpfe_resume(struct platform_device *pdev)
802{
803 struct init_data init;
804
805 return brcmstb_dpfe_download_firmware(pdev, &init);
806}
807
808static int brcmstb_dpfe_probe(struct platform_device *pdev)
809{
810 struct device *dev = &pdev->dev;
811 struct private_data *priv;
812 struct init_data init;
813 struct resource *res;
814 int ret;
815
816 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
817 if (!priv)
818 return -ENOMEM;
819
820 mutex_init(&priv->lock);
821 platform_set_drvdata(pdev, priv);
822
823 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dpfe-cpu");
824 priv->regs = devm_ioremap_resource(dev, res);
825 if (IS_ERR(priv->regs)) {
826 dev_err(dev, "couldn't map DCPU registers\n");
827 return -ENODEV;
828 }
829
830 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dpfe-dmem");
831 priv->dmem = devm_ioremap_resource(dev, res);
832 if (IS_ERR(priv->dmem)) {
833 dev_err(dev, "Couldn't map DCPU data memory\n");
834 return -ENOENT;
835 }
836
837 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dpfe-imem");
838 priv->imem = devm_ioremap_resource(dev, res);
839 if (IS_ERR(priv->imem)) {
840 dev_err(dev, "Couldn't map DCPU instruction memory\n");
841 return -ENOENT;
842 }
843
844 priv->dpfe_api = of_device_get_match_data(dev);
845 if (unlikely(!priv->dpfe_api)) {
846 /*
847 * It should be impossible to end up here, but to be safe we
848 * check anyway.
849 */
850 dev_err(dev, "Couldn't determine API\n");
851 return -ENOENT;
852 }
853
854 ret = brcmstb_dpfe_download_firmware(pdev, &init);
855 if (ret) {
856 dev_err(dev, "Couldn't download firmware -- %d\n", ret);
857 return ret;
858 }
859
860 ret = sysfs_create_groups(&pdev->dev.kobj, priv->dpfe_api->sysfs_attrs);
861 if (!ret)
862 dev_info(dev, "registered with API v%d.\n",
863 priv->dpfe_api->version);
864
865 return ret;
866}
867
868static int brcmstb_dpfe_remove(struct platform_device *pdev)
869{
870 struct private_data *priv = dev_get_drvdata(&pdev->dev);
871
872 sysfs_remove_groups(&pdev->dev.kobj, priv->dpfe_api->sysfs_attrs);
873
874 return 0;
875}
876
877static const struct of_device_id brcmstb_dpfe_of_match[] = {
878 /* Use legacy API v2 for a select number of chips */
879 { .compatible = "brcm,bcm7268-dpfe-cpu", .data = &dpfe_api_v2 },
880 { .compatible = "brcm,bcm7271-dpfe-cpu", .data = &dpfe_api_v2 },
881 { .compatible = "brcm,bcm7278-dpfe-cpu", .data = &dpfe_api_v2 },
882 { .compatible = "brcm,bcm7211-dpfe-cpu", .data = &dpfe_api_v2 },
883 /* API v3 is the default going forward */
884 { .compatible = "brcm,dpfe-cpu", .data = &dpfe_api_v3 },
885 {}
886};
887MODULE_DEVICE_TABLE(of, brcmstb_dpfe_of_match);
888
889static struct platform_driver brcmstb_dpfe_driver = {
890 .driver = {
891 .name = DRVNAME,
892 .of_match_table = brcmstb_dpfe_of_match,
893 },
894 .probe = brcmstb_dpfe_probe,
895 .remove = brcmstb_dpfe_remove,
896 .resume = brcmstb_dpfe_resume,
897};
898
899module_platform_driver(brcmstb_dpfe_driver);
900
901MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
902MODULE_DESCRIPTION("BRCMSTB DDR PHY Front End Driver");
903MODULE_LICENSE("GPL");