1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  pSeries firmware setup code.
4  *
5  *  Portions from arch/powerpc/platforms/pseries/setup.c:
6  *   Copyright (C) 1995  Linus Torvalds
7  *   Adapted from 'alpha' version by Gary Thomas
8  *   Modified by Cort Dougan (cort@cs.nmt.edu)
9  *   Modified by PPC64 Team, IBM Corp
10  *
11  *  Portions from arch/powerpc/kernel/firmware.c
12  *   Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
13  *   Modifications for ppc64:
14  *    Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
15  *    Copyright (C) 2005 Stephen Rothwell, IBM Corporation
16  *
17  *  Copyright 2006 IBM Corporation.
18  */
19 
20 
21 #include <linux/of_fdt.h>
22 #include <asm/firmware.h>
23 #include <asm/prom.h>
24 #include <asm/udbg.h>
25 
26 #include "pseries.h"
27 
28 struct hypertas_fw_feature {
29     unsigned long val;
30     char * name;
31 };
32 
33 /*
34  * The names in this table match names in rtas/ibm,hypertas-functions.  If the
35  * entry ends in a '*', only upto the '*' is matched.  Otherwise the entire
36  * string must match.
37  */
38 static __initdata struct hypertas_fw_feature
39 hypertas_fw_features_table[] = {
40 	{FW_FEATURE_PFT,		"hcall-pft"},
41 	{FW_FEATURE_TCE,		"hcall-tce"},
42 	{FW_FEATURE_SPRG0,		"hcall-sprg0"},
43 	{FW_FEATURE_DABR,		"hcall-dabr"},
44 	{FW_FEATURE_COPY,		"hcall-copy"},
45 	{FW_FEATURE_ASR,		"hcall-asr"},
46 	{FW_FEATURE_DEBUG,		"hcall-debug"},
47 	{FW_FEATURE_PERF,		"hcall-perf"},
48 	{FW_FEATURE_DUMP,		"hcall-dump"},
49 	{FW_FEATURE_INTERRUPT,		"hcall-interrupt"},
50 	{FW_FEATURE_MIGRATE,		"hcall-migrate"},
51 	{FW_FEATURE_PERFMON,		"hcall-perfmon"},
52 	{FW_FEATURE_CRQ,		"hcall-crq"},
53 	{FW_FEATURE_VIO,		"hcall-vio"},
54 	{FW_FEATURE_RDMA,		"hcall-rdma"},
55 	{FW_FEATURE_LLAN,		"hcall-lLAN"},
56 	{FW_FEATURE_BULK_REMOVE,	"hcall-bulk"},
57 	{FW_FEATURE_XDABR,		"hcall-xdabr"},
58 	{FW_FEATURE_MULTITCE,		"hcall-multi-tce"},
59 	{FW_FEATURE_SPLPAR,		"hcall-splpar"},
60 	{FW_FEATURE_VPHN,		"hcall-vphn"},
61 	{FW_FEATURE_SET_MODE,		"hcall-set-mode"},
62 	{FW_FEATURE_BEST_ENERGY,	"hcall-best-energy-1*"},
63 	{FW_FEATURE_HPT_RESIZE,		"hcall-hpt-resize"},
64 	{FW_FEATURE_BLOCK_REMOVE,	"hcall-block-remove"},
65 	{FW_FEATURE_PAPR_SCM,		"hcall-scm"},
66 };
67 
68 /* Build up the firmware features bitmask using the contents of
69  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
70  * be moved into prom.c prom_init().
71  */
72 static void __init fw_hypertas_feature_init(const char *hypertas,
73 					    unsigned long len)
74 {
75 	const char *s;
76 	int i;
77 
78 	pr_debug(" -> fw_hypertas_feature_init()\n");
79 
80 	for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
81 		for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
82 			const char *name = hypertas_fw_features_table[i].name;
83 			size_t size;
84 
85 			/*
86 			 * If there is a '*' at the end of name, only check
87 			 * upto there
88 			 */
89 			size = strlen(name);
90 			if (size && name[size - 1] == '*') {
91 				if (strncmp(name, s, size - 1))
92 					continue;
93 			} else if (strcmp(name, s))
94 				continue;
95 
96 			/* we have a match */
97 			powerpc_firmware_features |=
98 				hypertas_fw_features_table[i].val;
99 			break;
100 		}
101 	}
102 
103 	pr_debug(" <- fw_hypertas_feature_init()\n");
104 }
105 
106 struct vec5_fw_feature {
107 	unsigned long	val;
108 	unsigned int	feature;
109 };
110 
111 static __initdata struct vec5_fw_feature
112 vec5_fw_features_table[] = {
113 	{FW_FEATURE_TYPE1_AFFINITY,	OV5_TYPE1_AFFINITY},
114 	{FW_FEATURE_PRRN,		OV5_PRRN},
115 	{FW_FEATURE_DRMEM_V2,		OV5_DRMEM_V2},
116 	{FW_FEATURE_DRC_INFO,		OV5_DRC_INFO},
117 };
118 
119 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
120 {
121 	unsigned int index, feat;
122 	int i;
123 
124 	pr_debug(" -> fw_vec5_feature_init()\n");
125 
126 	for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
127 		index = OV5_INDX(vec5_fw_features_table[i].feature);
128 		feat = OV5_FEAT(vec5_fw_features_table[i].feature);
129 
130 		if (index < len && (vec5[index] & feat))
131 			powerpc_firmware_features |=
132 				vec5_fw_features_table[i].val;
133 	}
134 
135 	pr_debug(" <- fw_vec5_feature_init()\n");
136 }
137 
138 /*
139  * Called very early, MMU is off, device-tree isn't unflattened
140  */
141 static int __init probe_fw_features(unsigned long node, const char *uname, int
142 				    depth, void *data)
143 {
144 	const char *prop;
145 	int len;
146 	static int hypertas_found;
147 	static int vec5_found;
148 
149 	if (depth != 1)
150 		return 0;
151 
152 	if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
153 		prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
154 					   &len);
155 		if (prop) {
156 			powerpc_firmware_features |= FW_FEATURE_LPAR;
157 			fw_hypertas_feature_init(prop, len);
158 		}
159 
160 		hypertas_found = 1;
161 	}
162 
163 	if (!strcmp(uname, "chosen")) {
164 		prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
165 					   &len);
166 		if (prop)
167 			fw_vec5_feature_init(prop, len);
168 
169 		vec5_found = 1;
170 	}
171 
172 	return hypertas_found && vec5_found;
173 }
174 
175 void __init pseries_probe_fw_features(void)
176 {
177 	of_scan_flat_dt(probe_fw_features, NULL);
178 }
179