1 /**********************************************************************
2  * Author: Cavium, Inc.
3  *
4  * Contact: support@cavium.com
5  *          Please include "LiquidIO" in the subject.
6  *
7  * Copyright (c) 2003-2016 Cavium, Inc.
8  *
9  * This file is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License, Version 2, as
11  * published by the Free Software Foundation.
12  *
13  * This file is distributed in the hope that it will be useful, but
14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
16  * NONINFRINGEMENT.  See the GNU General Public License for more details.
17  ***********************************************************************/
18 /*
19  * @file octeon_console.c
20  */
21 #include <linux/moduleparam.h>
22 #include <linux/pci.h>
23 #include <linux/netdevice.h>
24 #include <linux/crc32.h>
25 #include "liquidio_common.h"
26 #include "octeon_droq.h"
27 #include "octeon_iq.h"
28 #include "response_manager.h"
29 #include "octeon_device.h"
30 #include "liquidio_image.h"
31 #include "octeon_mem_ops.h"
32 
33 static void octeon_remote_lock(void);
34 static void octeon_remote_unlock(void);
35 static u64 cvmx_bootmem_phy_named_block_find(struct octeon_device *oct,
36 					     const char *name,
37 					     u32 flags);
38 static int octeon_console_read(struct octeon_device *oct, u32 console_num,
39 			       char *buffer, u32 buf_size);
40 
41 #define BOOTLOADER_PCI_READ_BUFFER_DATA_ADDR    0x0006c008
42 #define BOOTLOADER_PCI_READ_BUFFER_LEN_ADDR     0x0006c004
43 #define BOOTLOADER_PCI_READ_BUFFER_OWNER_ADDR   0x0006c000
44 #define BOOTLOADER_PCI_READ_DESC_ADDR           0x0006c100
45 #define BOOTLOADER_PCI_WRITE_BUFFER_STR_LEN     248
46 
47 #define OCTEON_PCI_IO_BUF_OWNER_OCTEON    0x00000001
48 #define OCTEON_PCI_IO_BUF_OWNER_HOST      0x00000002
49 
50 /** Can change without breaking ABI */
51 #define CVMX_BOOTMEM_NUM_NAMED_BLOCKS 64
52 
53 /** minimum alignment of bootmem alloced blocks */
54 #define CVMX_BOOTMEM_ALIGNMENT_SIZE     (16ull)
55 
56 /** CVMX bootmem descriptor major version */
57 #define CVMX_BOOTMEM_DESC_MAJ_VER   3
58 /* CVMX bootmem descriptor minor version */
59 #define CVMX_BOOTMEM_DESC_MIN_VER   0
60 
61 /* Current versions */
62 #define OCTEON_PCI_CONSOLE_MAJOR_VERSION    1
63 #define OCTEON_PCI_CONSOLE_MINOR_VERSION    0
64 #define OCTEON_PCI_CONSOLE_BLOCK_NAME   "__pci_console"
65 #define OCTEON_CONSOLE_POLL_INTERVAL_MS  100    /* 10 times per second */
66 
67 /* First three members of cvmx_bootmem_desc are left in original
68  * positions for backwards compatibility.
69  * Assumes big endian target
70  */
71 struct cvmx_bootmem_desc {
72 	/** spinlock to control access to list */
73 	u32 lock;
74 
75 	/** flags for indicating various conditions */
76 	u32 flags;
77 
78 	u64 head_addr;
79 
80 	/** incremented changed when incompatible changes made */
81 	u32 major_version;
82 
83 	/** incremented changed when compatible changes made,
84 	 *  reset to zero when major incremented
85 	 */
86 	u32 minor_version;
87 
88 	u64 app_data_addr;
89 	u64 app_data_size;
90 
91 	/** number of elements in named blocks array */
92 	u32 nb_num_blocks;
93 
94 	/** length of name array in bootmem blocks */
95 	u32 named_block_name_len;
96 
97 	/** address of named memory block descriptors */
98 	u64 named_block_array_addr;
99 };
100 
101 /* Structure that defines a single console.
102  *
103  * Note: when read_index == write_index, the buffer is empty.
104  * The actual usable size of each console is console_buf_size -1;
105  */
106 struct octeon_pci_console {
107 	u64 input_base_addr;
108 	u32 input_read_index;
109 	u32 input_write_index;
110 	u64 output_base_addr;
111 	u32 output_read_index;
112 	u32 output_write_index;
113 	u32 lock;
114 	u32 buf_size;
115 };
116 
117 /* This is the main container structure that contains all the information
118  * about all PCI consoles.  The address of this structure is passed to various
119  * routines that operation on PCI consoles.
120  */
121 struct octeon_pci_console_desc {
122 	u32 major_version;
123 	u32 minor_version;
124 	u32 lock;
125 	u32 flags;
126 	u32 num_consoles;
127 	u32 pad;
128 	/* must be 64 bit aligned here... */
129 	/* Array of addresses of octeon_pci_console structures */
130 	u64 console_addr_array[];
131 	/* Implicit storage for console_addr_array */
132 };
133 
134 /*
135  * This function is the implementation of the get macros defined
136  * for individual structure members. The argument are generated
137  * by the macros inorder to read only the needed memory.
138  *
139  * @param oct    Pointer to current octeon device
140  * @param base   64bit physical address of the complete structure
141  * @param offset Offset from the beginning of the structure to the member being
142  *               accessed.
143  * @param size   Size of the structure member.
144  *
145  * @return Value of the structure member promoted into a u64.
146  */
147 static inline u64 __cvmx_bootmem_desc_get(struct octeon_device *oct,
148 					  u64 base,
149 					  u32 offset,
150 					  u32 size)
151 {
152 	base = (1ull << 63) | (base + offset);
153 	switch (size) {
154 	case 4:
155 		return octeon_read_device_mem32(oct, base);
156 	case 8:
157 		return octeon_read_device_mem64(oct, base);
158 	default:
159 		return 0;
160 	}
161 }
162 
163 /*
164  * This function retrieves the string name of a named block. It is
165  * more complicated than a simple memcpy() since the named block
166  * descriptor may not be directly accessible.
167  *
168  * @param addr   Physical address of the named block descriptor
169  * @param str    String to receive the named block string name
170  * @param len    Length of the string buffer, which must match the length
171  *               stored in the bootmem descriptor.
172  */
173 static void CVMX_BOOTMEM_NAMED_GET_NAME(struct octeon_device *oct,
174 					u64 addr,
175 					char *str,
176 					u32 len)
177 {
178 	addr += offsetof(struct cvmx_bootmem_named_block_desc, name);
179 	octeon_pci_read_core_mem(oct, addr, (u8 *)str, len);
180 	str[len] = 0;
181 }
182 
183 /* See header file for descriptions of functions */
184 
185 /*
186  * Check the version information on the bootmem descriptor
187  *
188  * @param exact_match
189  *               Exact major version to check against. A zero means
190  *               check that the version supports named blocks.
191  *
192  * @return Zero if the version is correct. Negative if the version is
193  *         incorrect. Failures also cause a message to be displayed.
194  */
195 static int __cvmx_bootmem_check_version(struct octeon_device *oct,
196 					u32 exact_match)
197 {
198 	u32 major_version;
199 	u32 minor_version;
200 
201 	if (!oct->bootmem_desc_addr)
202 		oct->bootmem_desc_addr =
203 			octeon_read_device_mem64(oct,
204 						 BOOTLOADER_PCI_READ_DESC_ADDR);
205 	major_version = (u32)__cvmx_bootmem_desc_get(
206 			oct, oct->bootmem_desc_addr,
207 			offsetof(struct cvmx_bootmem_desc, major_version),
208 			sizeof_field(struct cvmx_bootmem_desc, major_version));
209 	minor_version = (u32)__cvmx_bootmem_desc_get(
210 			oct, oct->bootmem_desc_addr,
211 			offsetof(struct cvmx_bootmem_desc, minor_version),
212 			sizeof_field(struct cvmx_bootmem_desc, minor_version));
213 
214 	dev_dbg(&oct->pci_dev->dev, "%s: major_version=%d\n", __func__,
215 		major_version);
216 	if ((major_version > 3) ||
217 	    (exact_match && major_version != exact_match)) {
218 		dev_err(&oct->pci_dev->dev, "bootmem ver mismatch %d.%d addr:0x%llx\n",
219 			major_version, minor_version,
220 			(long long)oct->bootmem_desc_addr);
221 		return -1;
222 	} else {
223 		return 0;
224 	}
225 }
226 
227 static const struct cvmx_bootmem_named_block_desc
228 *__cvmx_bootmem_find_named_block_flags(struct octeon_device *oct,
229 					const char *name, u32 flags)
230 {
231 	struct cvmx_bootmem_named_block_desc *desc =
232 		&oct->bootmem_named_block_desc;
233 	u64 named_addr = cvmx_bootmem_phy_named_block_find(oct, name, flags);
234 
235 	if (named_addr) {
236 		desc->base_addr = __cvmx_bootmem_desc_get(
237 				oct, named_addr,
238 				offsetof(struct cvmx_bootmem_named_block_desc,
239 					 base_addr),
240 				sizeof_field(
241 					struct cvmx_bootmem_named_block_desc,
242 					base_addr));
243 		desc->size = __cvmx_bootmem_desc_get(oct, named_addr,
244 				offsetof(struct cvmx_bootmem_named_block_desc,
245 					 size),
246 				sizeof_field(
247 					struct cvmx_bootmem_named_block_desc,
248 					size));
249 
250 		strncpy(desc->name, name, sizeof(desc->name));
251 		desc->name[sizeof(desc->name) - 1] = 0;
252 		return &oct->bootmem_named_block_desc;
253 	} else {
254 		return NULL;
255 	}
256 }
257 
258 static u64 cvmx_bootmem_phy_named_block_find(struct octeon_device *oct,
259 					     const char *name,
260 					     u32 flags)
261 {
262 	u64 result = 0;
263 
264 	if (!__cvmx_bootmem_check_version(oct, 3)) {
265 		u32 i;
266 
267 		u64 named_block_array_addr = __cvmx_bootmem_desc_get(
268 					oct, oct->bootmem_desc_addr,
269 					offsetof(struct cvmx_bootmem_desc,
270 						 named_block_array_addr),
271 					sizeof_field(struct cvmx_bootmem_desc,
272 						     named_block_array_addr));
273 		u32 num_blocks = (u32)__cvmx_bootmem_desc_get(
274 					oct, oct->bootmem_desc_addr,
275 					offsetof(struct cvmx_bootmem_desc,
276 						 nb_num_blocks),
277 					sizeof_field(struct cvmx_bootmem_desc,
278 						     nb_num_blocks));
279 
280 		u32 name_length = (u32)__cvmx_bootmem_desc_get(
281 					oct, oct->bootmem_desc_addr,
282 					offsetof(struct cvmx_bootmem_desc,
283 						 named_block_name_len),
284 					sizeof_field(struct cvmx_bootmem_desc,
285 						     named_block_name_len));
286 
287 		u64 named_addr = named_block_array_addr;
288 
289 		for (i = 0; i < num_blocks; i++) {
290 			u64 named_size = __cvmx_bootmem_desc_get(
291 					oct, named_addr,
292 					 offsetof(
293 					struct cvmx_bootmem_named_block_desc,
294 					size),
295 					 sizeof_field(
296 					struct cvmx_bootmem_named_block_desc,
297 					size));
298 
299 			if (name && named_size) {
300 				char *name_tmp =
301 					kmalloc(name_length + 1, GFP_KERNEL);
302 				if (!name_tmp)
303 					break;
304 
305 				CVMX_BOOTMEM_NAMED_GET_NAME(oct, named_addr,
306 							    name_tmp,
307 							    name_length);
308 				if (!strncmp(name, name_tmp, name_length)) {
309 					result = named_addr;
310 					kfree(name_tmp);
311 					break;
312 				}
313 				kfree(name_tmp);
314 			} else if (!name && !named_size) {
315 				result = named_addr;
316 				break;
317 			}
318 
319 			named_addr +=
320 				sizeof(struct cvmx_bootmem_named_block_desc);
321 		}
322 	}
323 	return result;
324 }
325 
326 /*
327  * Find a named block on the remote Octeon
328  *
329  * @param name      Name of block to find
330  * @param base_addr Address the block is at (OUTPUT)
331  * @param size      The size of the block (OUTPUT)
332  *
333  * @return Zero on success, One on failure.
334  */
335 static int octeon_named_block_find(struct octeon_device *oct, const char *name,
336 				   u64 *base_addr, u64 *size)
337 {
338 	const struct cvmx_bootmem_named_block_desc *named_block;
339 
340 	octeon_remote_lock();
341 	named_block = __cvmx_bootmem_find_named_block_flags(oct, name, 0);
342 	octeon_remote_unlock();
343 	if (named_block) {
344 		*base_addr = named_block->base_addr;
345 		*size = named_block->size;
346 		return 0;
347 	}
348 	return 1;
349 }
350 
351 static void octeon_remote_lock(void)
352 {
353 	/* fill this in if any sharing is needed */
354 }
355 
356 static void octeon_remote_unlock(void)
357 {
358 	/* fill this in if any sharing is needed */
359 }
360 
361 int octeon_console_send_cmd(struct octeon_device *oct, char *cmd_str,
362 			    u32 wait_hundredths)
363 {
364 	u32 len = (u32)strlen(cmd_str);
365 
366 	dev_dbg(&oct->pci_dev->dev, "sending \"%s\" to bootloader\n", cmd_str);
367 
368 	if (len > BOOTLOADER_PCI_WRITE_BUFFER_STR_LEN - 1) {
369 		dev_err(&oct->pci_dev->dev, "Command string too long, max length is: %d\n",
370 			BOOTLOADER_PCI_WRITE_BUFFER_STR_LEN - 1);
371 		return -1;
372 	}
373 
374 	if (octeon_wait_for_bootloader(oct, wait_hundredths) != 0) {
375 		dev_err(&oct->pci_dev->dev, "Bootloader not ready for command.\n");
376 		return -1;
377 	}
378 
379 	/* Write command to bootloader */
380 	octeon_remote_lock();
381 	octeon_pci_write_core_mem(oct, BOOTLOADER_PCI_READ_BUFFER_DATA_ADDR,
382 				  (u8 *)cmd_str, len);
383 	octeon_write_device_mem32(oct, BOOTLOADER_PCI_READ_BUFFER_LEN_ADDR,
384 				  len);
385 	octeon_write_device_mem32(oct, BOOTLOADER_PCI_READ_BUFFER_OWNER_ADDR,
386 				  OCTEON_PCI_IO_BUF_OWNER_OCTEON);
387 
388 	/* Bootloader should accept command very quickly
389 	 * if it really was ready
390 	 */
391 	if (octeon_wait_for_bootloader(oct, 200) != 0) {
392 		octeon_remote_unlock();
393 		dev_err(&oct->pci_dev->dev, "Bootloader did not accept command.\n");
394 		return -1;
395 	}
396 	octeon_remote_unlock();
397 	return 0;
398 }
399 
400 int octeon_wait_for_bootloader(struct octeon_device *oct,
401 			       u32 wait_time_hundredths)
402 {
403 	dev_dbg(&oct->pci_dev->dev, "waiting %d0 ms for bootloader\n",
404 		wait_time_hundredths);
405 
406 	if (octeon_mem_access_ok(oct))
407 		return -1;
408 
409 	while (wait_time_hundredths > 0 &&
410 	       octeon_read_device_mem32(oct,
411 					BOOTLOADER_PCI_READ_BUFFER_OWNER_ADDR)
412 	       != OCTEON_PCI_IO_BUF_OWNER_HOST) {
413 		if (--wait_time_hundredths <= 0)
414 			return -1;
415 		schedule_timeout_uninterruptible(HZ / 100);
416 	}
417 	return 0;
418 }
419 
420 static void octeon_console_handle_result(struct octeon_device *oct,
421 					 size_t console_num)
422 {
423 	struct octeon_console *console;
424 
425 	console = &oct->console[console_num];
426 
427 	console->waiting = 0;
428 }
429 
430 static char console_buffer[OCTEON_CONSOLE_MAX_READ_BYTES];
431 
432 static void output_console_line(struct octeon_device *oct,
433 				struct octeon_console *console,
434 				size_t console_num,
435 				char *console_buffer,
436 				s32 bytes_read)
437 {
438 	char *line;
439 	s32 i;
440 	size_t len;
441 
442 	line = console_buffer;
443 	for (i = 0; i < bytes_read; i++) {
444 		/* Output a line at a time, prefixed */
445 		if (console_buffer[i] == '\n') {
446 			console_buffer[i] = '\0';
447 			/* We need to output 'line', prefaced by 'leftover'.
448 			 * However, it is possible we're being called to
449 			 * output 'leftover' by itself (in the case of nothing
450 			 * having been read from the console).
451 			 *
452 			 * To avoid duplication, check for this condition.
453 			 */
454 			if (console->leftover[0] &&
455 			    (line != console->leftover)) {
456 				if (console->print)
457 					(*console->print)(oct, (u32)console_num,
458 							  console->leftover,
459 							  line);
460 				console->leftover[0] = '\0';
461 			} else {
462 				if (console->print)
463 					(*console->print)(oct, (u32)console_num,
464 							  line, NULL);
465 			}
466 			line = &console_buffer[i + 1];
467 		}
468 	}
469 
470 	/* Save off any leftovers */
471 	if (line != &console_buffer[bytes_read]) {
472 		console_buffer[bytes_read] = '\0';
473 		len = strlen(console->leftover);
474 		strncpy(&console->leftover[len], line,
475 			sizeof(console->leftover) - len);
476 	}
477 }
478 
479 static void check_console(struct work_struct *work)
480 {
481 	s32 bytes_read, tries, total_read;
482 	size_t len;
483 	struct octeon_console *console;
484 	struct cavium_wk *wk = (struct cavium_wk *)work;
485 	struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
486 	u32 console_num = (u32)wk->ctxul;
487 	u32 delay;
488 
489 	console = &oct->console[console_num];
490 	tries = 0;
491 	total_read = 0;
492 
493 	do {
494 		/* Take console output regardless of whether it will
495 		 * be logged
496 		 */
497 		bytes_read =
498 			octeon_console_read(oct, console_num, console_buffer,
499 					    sizeof(console_buffer) - 1);
500 		if (bytes_read > 0) {
501 			total_read += bytes_read;
502 			if (console->waiting)
503 				octeon_console_handle_result(oct, console_num);
504 			if (console->print) {
505 				output_console_line(oct, console, console_num,
506 						    console_buffer, bytes_read);
507 			}
508 		} else if (bytes_read < 0) {
509 			dev_err(&oct->pci_dev->dev, "Error reading console %u, ret=%d\n",
510 				console_num, bytes_read);
511 		}
512 
513 		tries++;
514 	} while ((bytes_read > 0) && (tries < 16));
515 
516 	/* If nothing is read after polling the console,
517 	 * output any leftovers if any
518 	 */
519 	if (console->print && (total_read == 0) &&
520 	    (console->leftover[0])) {
521 		/* append '\n' as terminator for 'output_console_line' */
522 		len = strlen(console->leftover);
523 		console->leftover[len] = '\n';
524 		output_console_line(oct, console, console_num,
525 				    console->leftover, (s32)(len + 1));
526 		console->leftover[0] = '\0';
527 	}
528 
529 	delay = OCTEON_CONSOLE_POLL_INTERVAL_MS;
530 
531 	schedule_delayed_work(&wk->work, msecs_to_jiffies(delay));
532 }
533 
534 int octeon_init_consoles(struct octeon_device *oct)
535 {
536 	int ret = 0;
537 	u64 addr, size;
538 
539 	ret = octeon_mem_access_ok(oct);
540 	if (ret) {
541 		dev_err(&oct->pci_dev->dev, "Memory access not okay'\n");
542 		return ret;
543 	}
544 
545 	ret = octeon_named_block_find(oct, OCTEON_PCI_CONSOLE_BLOCK_NAME, &addr,
546 				      &size);
547 	if (ret) {
548 		dev_err(&oct->pci_dev->dev, "Could not find console '%s'\n",
549 			OCTEON_PCI_CONSOLE_BLOCK_NAME);
550 		return ret;
551 	}
552 
553 	/* Dedicate one of Octeon's BAR1 index registers to create a static
554 	 * mapping to a region of Octeon DRAM that contains the PCI console
555 	 * named block.
556 	 */
557 	oct->console_nb_info.bar1_index = BAR1_INDEX_STATIC_MAP;
558 	oct->fn_list.bar1_idx_setup(oct, addr, oct->console_nb_info.bar1_index,
559 				    true);
560 	oct->console_nb_info.dram_region_base = addr
561 		& ~(OCTEON_BAR1_ENTRY_SIZE - 1ULL);
562 
563 	/* num_consoles > 0, is an indication that the consoles
564 	 * are accessible
565 	 */
566 	oct->num_consoles = octeon_read_device_mem32(oct,
567 		addr + offsetof(struct octeon_pci_console_desc,
568 			num_consoles));
569 	oct->console_desc_addr = addr;
570 
571 	dev_dbg(&oct->pci_dev->dev, "Initialized consoles. %d available\n",
572 		oct->num_consoles);
573 
574 	return ret;
575 }
576 
577 static void octeon_get_uboot_version(struct octeon_device *oct)
578 {
579 	s32 bytes_read, tries, total_read;
580 	struct octeon_console *console;
581 	u32 console_num = 0;
582 	char *uboot_ver;
583 	char *buf;
584 	char *p;
585 
586 #define OCTEON_UBOOT_VER_BUF_SIZE 512
587 	buf = kmalloc(OCTEON_UBOOT_VER_BUF_SIZE, GFP_KERNEL);
588 	if (!buf)
589 		return;
590 
591 	if (octeon_console_send_cmd(oct, "setenv stdout pci\n", 50)) {
592 		kfree(buf);
593 		return;
594 	}
595 
596 	if (octeon_console_send_cmd(oct, "version\n", 1)) {
597 		kfree(buf);
598 		return;
599 	}
600 
601 	console = &oct->console[console_num];
602 	tries = 0;
603 	total_read = 0;
604 
605 	do {
606 		/* Take console output regardless of whether it will
607 		 * be logged
608 		 */
609 		bytes_read =
610 			octeon_console_read(oct,
611 					    console_num, buf + total_read,
612 					    OCTEON_UBOOT_VER_BUF_SIZE - 1 -
613 					    total_read);
614 		if (bytes_read > 0) {
615 			buf[bytes_read] = '\0';
616 
617 			total_read += bytes_read;
618 			if (console->waiting)
619 				octeon_console_handle_result(oct, console_num);
620 		} else if (bytes_read < 0) {
621 			dev_err(&oct->pci_dev->dev, "Error reading console %u, ret=%d\n",
622 				console_num, bytes_read);
623 		}
624 
625 		tries++;
626 	} while ((bytes_read > 0) && (tries < 16));
627 
628 	/* If nothing is read after polling the console,
629 	 * output any leftovers if any
630 	 */
631 	if ((total_read == 0) && (console->leftover[0])) {
632 		dev_dbg(&oct->pci_dev->dev, "%u: %s\n",
633 			console_num, console->leftover);
634 		console->leftover[0] = '\0';
635 	}
636 
637 	buf[OCTEON_UBOOT_VER_BUF_SIZE - 1] = '\0';
638 
639 	uboot_ver = strstr(buf, "U-Boot");
640 	if (uboot_ver) {
641 		p = strstr(uboot_ver, "mips");
642 		if (p) {
643 			p--;
644 			*p = '\0';
645 			dev_info(&oct->pci_dev->dev, "%s\n", uboot_ver);
646 		}
647 	}
648 
649 	kfree(buf);
650 	octeon_console_send_cmd(oct, "setenv stdout serial\n", 50);
651 }
652 
653 int octeon_add_console(struct octeon_device *oct, u32 console_num,
654 		       char *dbg_enb)
655 {
656 	int ret = 0;
657 	u32 delay;
658 	u64 coreaddr;
659 	struct delayed_work *work;
660 	struct octeon_console *console;
661 
662 	if (console_num >= oct->num_consoles) {
663 		dev_err(&oct->pci_dev->dev,
664 			"trying to read from console number %d when only 0 to %d exist\n",
665 			console_num, oct->num_consoles);
666 	} else {
667 		console = &oct->console[console_num];
668 
669 		console->waiting = 0;
670 
671 		coreaddr = oct->console_desc_addr + console_num * 8 +
672 			offsetof(struct octeon_pci_console_desc,
673 				 console_addr_array);
674 		console->addr = octeon_read_device_mem64(oct, coreaddr);
675 		coreaddr = console->addr + offsetof(struct octeon_pci_console,
676 						    buf_size);
677 		console->buffer_size = octeon_read_device_mem32(oct, coreaddr);
678 		coreaddr = console->addr + offsetof(struct octeon_pci_console,
679 						    input_base_addr);
680 		console->input_base_addr =
681 			octeon_read_device_mem64(oct, coreaddr);
682 		coreaddr = console->addr + offsetof(struct octeon_pci_console,
683 						    output_base_addr);
684 		console->output_base_addr =
685 			octeon_read_device_mem64(oct, coreaddr);
686 		console->leftover[0] = '\0';
687 
688 		work = &oct->console_poll_work[console_num].work;
689 
690 		octeon_get_uboot_version(oct);
691 
692 		INIT_DELAYED_WORK(work, check_console);
693 		oct->console_poll_work[console_num].ctxptr = (void *)oct;
694 		oct->console_poll_work[console_num].ctxul = console_num;
695 		delay = OCTEON_CONSOLE_POLL_INTERVAL_MS;
696 		schedule_delayed_work(work, msecs_to_jiffies(delay));
697 
698 		/* an empty string means use default debug console enablement */
699 		if (dbg_enb && !dbg_enb[0])
700 			dbg_enb = "setenv pci_console_active 1";
701 		if (dbg_enb)
702 			ret = octeon_console_send_cmd(oct, dbg_enb, 2000);
703 
704 		console->active = 1;
705 	}
706 
707 	return ret;
708 }
709 
710 /*
711  * Removes all consoles
712  *
713  * @param oct         octeon device
714  */
715 void octeon_remove_consoles(struct octeon_device *oct)
716 {
717 	u32 i;
718 	struct octeon_console *console;
719 
720 	for (i = 0; i < oct->num_consoles; i++) {
721 		console = &oct->console[i];
722 
723 		if (!console->active)
724 			continue;
725 
726 		cancel_delayed_work_sync(&oct->console_poll_work[i].
727 						work);
728 		console->addr = 0;
729 		console->buffer_size = 0;
730 		console->input_base_addr = 0;
731 		console->output_base_addr = 0;
732 	}
733 
734 	oct->num_consoles = 0;
735 }
736 
737 static inline int octeon_console_free_bytes(u32 buffer_size,
738 					    u32 wr_idx,
739 					    u32 rd_idx)
740 {
741 	if (rd_idx >= buffer_size || wr_idx >= buffer_size)
742 		return -1;
743 
744 	return ((buffer_size - 1) - (wr_idx - rd_idx)) % buffer_size;
745 }
746 
747 static inline int octeon_console_avail_bytes(u32 buffer_size,
748 					     u32 wr_idx,
749 					     u32 rd_idx)
750 {
751 	if (rd_idx >= buffer_size || wr_idx >= buffer_size)
752 		return -1;
753 
754 	return buffer_size - 1 -
755 	       octeon_console_free_bytes(buffer_size, wr_idx, rd_idx);
756 }
757 
758 static int octeon_console_read(struct octeon_device *oct, u32 console_num,
759 			       char *buffer, u32 buf_size)
760 {
761 	int bytes_to_read;
762 	u32 rd_idx, wr_idx;
763 	struct octeon_console *console;
764 
765 	if (console_num >= oct->num_consoles) {
766 		dev_err(&oct->pci_dev->dev, "Attempted to read from disabled console %d\n",
767 			console_num);
768 		return 0;
769 	}
770 
771 	console = &oct->console[console_num];
772 
773 	/* Check to see if any data is available.
774 	 * Maybe optimize this with 64-bit read.
775 	 */
776 	rd_idx = octeon_read_device_mem32(oct, console->addr +
777 		offsetof(struct octeon_pci_console, output_read_index));
778 	wr_idx = octeon_read_device_mem32(oct, console->addr +
779 		offsetof(struct octeon_pci_console, output_write_index));
780 
781 	bytes_to_read = octeon_console_avail_bytes(console->buffer_size,
782 						   wr_idx, rd_idx);
783 	if (bytes_to_read <= 0)
784 		return bytes_to_read;
785 
786 	bytes_to_read = min_t(s32, bytes_to_read, buf_size);
787 
788 	/* Check to see if what we want to read is not contiguous, and limit
789 	 * ourselves to the contiguous block
790 	 */
791 	if (rd_idx + bytes_to_read >= console->buffer_size)
792 		bytes_to_read = console->buffer_size - rd_idx;
793 
794 	octeon_pci_read_core_mem(oct, console->output_base_addr + rd_idx,
795 				 (u8 *)buffer, bytes_to_read);
796 	octeon_write_device_mem32(oct, console->addr +
797 				  offsetof(struct octeon_pci_console,
798 					   output_read_index),
799 				  (rd_idx + bytes_to_read) %
800 				  console->buffer_size);
801 
802 	return bytes_to_read;
803 }
804 
805 #define FBUF_SIZE	(4 * 1024 * 1024)
806 #define MAX_BOOTTIME_SIZE    80
807 
808 int octeon_download_firmware(struct octeon_device *oct, const u8 *data,
809 			     size_t size)
810 {
811 	struct octeon_firmware_file_header *h;
812 	char boottime[MAX_BOOTTIME_SIZE];
813 	struct timespec64 ts;
814 	u32 crc32_result;
815 	u64 load_addr;
816 	u32 image_len;
817 	int ret = 0;
818 	u32 i, rem;
819 
820 	if (size < sizeof(struct octeon_firmware_file_header)) {
821 		dev_err(&oct->pci_dev->dev, "Firmware file too small (%d < %d).\n",
822 			(u32)size,
823 			(u32)sizeof(struct octeon_firmware_file_header));
824 		return -EINVAL;
825 	}
826 
827 	h = (struct octeon_firmware_file_header *)data;
828 
829 	if (be32_to_cpu(h->magic) != LIO_NIC_MAGIC) {
830 		dev_err(&oct->pci_dev->dev, "Unrecognized firmware file.\n");
831 		return -EINVAL;
832 	}
833 
834 	crc32_result = crc32((unsigned int)~0, data,
835 			     sizeof(struct octeon_firmware_file_header) -
836 			     sizeof(u32)) ^ ~0U;
837 	if (crc32_result != be32_to_cpu(h->crc32)) {
838 		dev_err(&oct->pci_dev->dev, "Firmware CRC mismatch (0x%08x != 0x%08x).\n",
839 			crc32_result, be32_to_cpu(h->crc32));
840 		return -EINVAL;
841 	}
842 
843 	if (memcmp(LIQUIDIO_BASE_VERSION, h->version,
844 		   strlen(LIQUIDIO_BASE_VERSION))) {
845 		dev_err(&oct->pci_dev->dev, "Unmatched firmware version. Expected %s.x, got %s.\n",
846 			LIQUIDIO_BASE_VERSION,
847 			h->version);
848 		return -EINVAL;
849 	}
850 
851 	if (be32_to_cpu(h->num_images) > LIO_MAX_IMAGES) {
852 		dev_err(&oct->pci_dev->dev, "Too many images in firmware file (%d).\n",
853 			be32_to_cpu(h->num_images));
854 		return -EINVAL;
855 	}
856 
857 	dev_info(&oct->pci_dev->dev, "Firmware version: %s\n", h->version);
858 	snprintf(oct->fw_info.liquidio_firmware_version, 32, "LIQUIDIO: %s",
859 		 h->version);
860 
861 	data += sizeof(struct octeon_firmware_file_header);
862 
863 	dev_info(&oct->pci_dev->dev, "%s: Loading %d images\n", __func__,
864 		 be32_to_cpu(h->num_images));
865 	/* load all images */
866 	for (i = 0; i < be32_to_cpu(h->num_images); i++) {
867 		load_addr = be64_to_cpu(h->desc[i].addr);
868 		image_len = be32_to_cpu(h->desc[i].len);
869 
870 		dev_info(&oct->pci_dev->dev, "Loading firmware %d at %llx\n",
871 			 image_len, load_addr);
872 
873 		/* Write in 4MB chunks*/
874 		rem = image_len;
875 
876 		while (rem) {
877 			if (rem < FBUF_SIZE)
878 				size = rem;
879 			else
880 				size = FBUF_SIZE;
881 
882 			/* download the image */
883 			octeon_pci_write_core_mem(oct, load_addr, data, (u32)size);
884 
885 			data += size;
886 			rem -= (u32)size;
887 			load_addr += size;
888 		}
889 	}
890 
891 	/* Pass date and time information to NIC at the time of loading
892 	 * firmware and periodically update the host time to NIC firmware.
893 	 * This is to make NIC firmware use the same time reference as Host,
894 	 * so that it is easy to correlate logs from firmware and host for
895 	 * debugging.
896 	 *
897 	 * Octeon always uses UTC time. so timezone information is not sent.
898 	 */
899 	ktime_get_real_ts64(&ts);
900 	ret = snprintf(boottime, MAX_BOOTTIME_SIZE,
901 		       " time_sec=%lld time_nsec=%ld",
902 		       (s64)ts.tv_sec, ts.tv_nsec);
903 	if ((sizeof(h->bootcmd) - strnlen(h->bootcmd, sizeof(h->bootcmd))) <
904 		ret) {
905 		dev_err(&oct->pci_dev->dev, "Boot command buffer too small\n");
906 		return -EINVAL;
907 	}
908 	strncat(h->bootcmd, boottime,
909 		sizeof(h->bootcmd) - strnlen(h->bootcmd, sizeof(h->bootcmd)));
910 
911 	dev_info(&oct->pci_dev->dev, "Writing boot command: %s\n",
912 		 h->bootcmd);
913 
914 	/* Invoke the bootcmd */
915 	ret = octeon_console_send_cmd(oct, h->bootcmd, 50);
916 	if (ret)
917 		dev_info(&oct->pci_dev->dev, "Boot command send failed\n");
918 
919 	return ret;
920 }
921