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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/arch/parisc/kernel/firmware.c
....@@ -1,9 +1,11 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * arch/parisc/kernel/firmware.c  - safe PDC access routines
34  *
45  *	PDC == Processor Dependent Code
56  *
6
- * See http://www.parisc-linux.org/documentation/index.html
7
+ * See PDC documentation at
8
+ * https://parisc.wiki.kernel.org/index.php/Technical_Documentation
79  * for documentation describing the entry points and calling
810  * conventions defined below.
911  *
....@@ -12,12 +14,6 @@
1214  * Copyright 2003 Grant Grundler <grundler parisc-linux org>
1315  * Copyright 2003,2004 Ryan Bradetich <rbrad@parisc-linux.org>
1416  * Copyright 2004,2006 Thibaut VARENE <varenet@parisc-linux.org>
15
- *
16
- *    This program is free software; you can redistribute it and/or modify
17
- *    it under the terms of the GNU General Public License as published by
18
- *    the Free Software Foundation; either version 2 of the License, or
19
- *    (at your option) any later version.
20
- *
2117  */
2218 
2319 /*	I think it would be in everyone's best interest to follow this
....@@ -87,7 +83,7 @@
8783 
8884 /* Firmware needs to be initially set to narrow to determine the 
8985  * actual firmware width. */
90
-int parisc_narrow_firmware __read_mostly = 1;
86
+int parisc_narrow_firmware __ro_after_init = 1;
9187 #endif
9288 
9389 /* On most currently-supported platforms, IODC I/O calls are 32-bit calls
....@@ -315,6 +311,19 @@
315311 
316312 	return retval;
317313 }
314
+
315
+/**
316
+ * pdc_cpu_rendenzvous - Stop currently executing CPU
317
+ * @retval: -1 on error, 0 on success
318
+ */
319
+int __pdc_cpu_rendezvous(void)
320
+{
321
+	if (is_pdc_pat())
322
+		return mem_pdc_call(PDC_PAT_CPU, PDC_PAT_CPU_RENDEZVOUS);
323
+	else
324
+		return mem_pdc_call(PDC_PROC, 1, 0);
325
+}
326
+
318327 
319328 /**
320329  * pdc_chassis_warn - Fetches chassis warnings
....@@ -566,6 +575,30 @@
566575         spin_unlock_irqrestore(&pdc_lock, flags);
567576 
568577         return retval;
578
+}
579
+
580
+/**
581
+ * pdc_model_platform_info - Returns machine product and serial number.
582
+ * @orig_prod_num: Return buffer for original product number.
583
+ * @current_prod_num: Return buffer for current product number.
584
+ * @serial_no: Return buffer for serial number.
585
+ *
586
+ * Returns strings containing the original and current product numbers and the
587
+ * serial number of the system.
588
+ */
589
+int pdc_model_platform_info(char *orig_prod_num, char *current_prod_num,
590
+		char *serial_no)
591
+{
592
+	int retval;
593
+	unsigned long flags;
594
+
595
+	spin_lock_irqsave(&pdc_lock, flags);
596
+	retval = mem_pdc_call(PDC_MODEL, PDC_MODEL_GET_PLATFORM_INFO,
597
+		__pa(orig_prod_num), __pa(current_prod_num), __pa(serial_no));
598
+	convert_to_wide(pdc_result);
599
+	spin_unlock_irqrestore(&pdc_lock, flags);
600
+
601
+	return retval;
569602 }
570603 
571604 /**
....@@ -1197,7 +1230,7 @@
11971230  */
11981231 int pdc_iodc_print(const unsigned char *str, unsigned count)
11991232 {
1200
-	unsigned int i;
1233
+	unsigned int i, found = 0;
12011234 	unsigned long flags;
12021235 
12031236 	for (i = 0; i < count;) {
....@@ -1206,6 +1239,7 @@
12061239 			iodc_dbuf[i+0] = '\r';
12071240 			iodc_dbuf[i+1] = '\n';
12081241 			i += 2;
1242
+			found = 1;
12091243 			goto print;
12101244 		default:
12111245 			iodc_dbuf[i] = str[i];
....@@ -1222,7 +1256,7 @@
12221256                     __pa(iodc_retbuf), 0, __pa(iodc_dbuf), i, 0);
12231257         spin_unlock_irqrestore(&pdc_lock, flags);
12241258 
1225
-	return i;
1259
+	return i - found;
12261260 }
12271261 
12281262 #if !defined(BOOTLOADER)
....@@ -1326,6 +1360,36 @@
13261360 }
13271361 
13281362 /**
1363
+ * pdc_pat_cell_info - Retrieve the cell's information.
1364
+ * @info: The pointer to a struct pdc_pat_cell_info_rtn_block.
1365
+ * @actcnt: The number of bytes which should be written to info.
1366
+ * @offset: offset of the structure.
1367
+ * @cell_number: The cell number which should be asked, or -1 for current cell.
1368
+ *
1369
+ * This PDC call returns information about the given cell (or all cells).
1370
+ */
1371
+int pdc_pat_cell_info(struct pdc_pat_cell_info_rtn_block *info,
1372
+		unsigned long *actcnt, unsigned long offset,
1373
+		unsigned long cell_number)
1374
+{
1375
+	int retval;
1376
+	unsigned long flags;
1377
+	struct pdc_pat_cell_info_rtn_block result;
1378
+
1379
+	spin_lock_irqsave(&pdc_lock, flags);
1380
+	retval = mem_pdc_call(PDC_PAT_CELL, PDC_PAT_CELL_GET_INFO,
1381
+			__pa(pdc_result), __pa(&result), *actcnt,
1382
+			offset, cell_number);
1383
+	if (!retval) {
1384
+		*actcnt = pdc_result[0];
1385
+		memcpy(info, &result, *actcnt);
1386
+	}
1387
+	spin_unlock_irqrestore(&pdc_lock, flags);
1388
+
1389
+	return retval;
1390
+}
1391
+
1392
+/**
13291393  * pdc_pat_cpu_get_number - Retrieve the cpu number.
13301394  * @cpu_info: The return buffer.
13311395  * @hpa: The Hard Physical Address of the CPU.
....@@ -1413,6 +1477,33 @@
14131477 }
14141478 
14151479 /**
1480
+ * pdc_pat_pd_get_PDC_interface_revisions - Retrieve PDC interface revisions.
1481
+ * @legacy_rev: The legacy revision.
1482
+ * @pat_rev: The PAT revision.
1483
+ * @pdc_cap: The PDC capabilities.
1484
+ *
1485
+ */
1486
+int pdc_pat_pd_get_pdc_revisions(unsigned long *legacy_rev,
1487
+		unsigned long *pat_rev, unsigned long *pdc_cap)
1488
+{
1489
+	int retval;
1490
+	unsigned long flags;
1491
+
1492
+	spin_lock_irqsave(&pdc_lock, flags);
1493
+	retval = mem_pdc_call(PDC_PAT_PD, PDC_PAT_PD_GET_PDC_INTERF_REV,
1494
+				__pa(pdc_result));
1495
+	if (retval == PDC_OK) {
1496
+		*legacy_rev = pdc_result[0];
1497
+		*pat_rev = pdc_result[1];
1498
+		*pdc_cap = pdc_result[2];
1499
+	}
1500
+	spin_unlock_irqrestore(&pdc_lock, flags);
1501
+
1502
+	return retval;
1503
+}
1504
+
1505
+
1506
+/**
14161507  * pdc_pat_io_pci_cfg_read - Read PCI configuration space.
14171508  * @pci_addr: PCI configuration space address for which the read request is being made.
14181509  * @pci_size: Size of read in bytes. Valid values are 1, 2, and 4.