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1 | /* |
2 | * PowerNV OPAL high level interfaces | |
3 | * | |
4 | * Copyright 2011 IBM Corp. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #undef DEBUG | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_platform.h> | |
17 | #include <asm/opal.h> | |
18 | #include <asm/firmware.h> | |
19 | ||
20 | #include "powernv.h" | |
21 | ||
22 | struct opal { | |
23 | u64 base; | |
24 | u64 entry; | |
25 | } opal; | |
26 | ||
27 | static struct device_node *opal_node; | |
28 | static DEFINE_SPINLOCK(opal_write_lock); | |
29 | ||
30 | int __init early_init_dt_scan_opal(unsigned long node, | |
31 | const char *uname, int depth, void *data) | |
32 | { | |
33 | const void *basep, *entryp; | |
34 | unsigned long basesz, entrysz; | |
35 | ||
36 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
37 | return 0; | |
38 | ||
39 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
40 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
41 | ||
42 | if (!basep || !entryp) | |
43 | return 1; | |
44 | ||
45 | opal.base = of_read_number(basep, basesz/4); | |
46 | opal.entry = of_read_number(entryp, entrysz/4); | |
47 | ||
48 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n", | |
49 | opal.base, basep, basesz); | |
50 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n", | |
51 | opal.entry, entryp, entrysz); | |
52 | ||
53 | powerpc_firmware_features |= FW_FEATURE_OPAL; | |
54 | if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { | |
55 | powerpc_firmware_features |= FW_FEATURE_OPALv2; | |
56 | printk("OPAL V2 detected !\n"); | |
57 | } else { | |
58 | printk("OPAL V1 detected !\n"); | |
59 | } | |
60 | ||
61 | return 1; | |
62 | } | |
63 | ||
64 | int opal_get_chars(uint32_t vtermno, char *buf, int count) | |
65 | { | |
66 | s64 len, rc; | |
67 | u64 evt; | |
68 | ||
69 | if (!opal.entry) | |
70 | return 0; | |
71 | opal_poll_events(&evt); | |
72 | if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0) | |
73 | return 0; | |
74 | len = count; | |
75 | rc = opal_console_read(vtermno, &len, buf); | |
76 | if (rc == OPAL_SUCCESS) | |
77 | return len; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
82 | { | |
83 | int written = 0; | |
84 | s64 len, rc = OPAL_BUSY; | |
85 | unsigned long flags; | |
86 | u64 evt; | |
87 | ||
88 | if (!opal.entry) | |
89 | return 0; | |
90 | ||
91 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
92 | * packets. To do that, we first test for room and return | |
93 | * -EAGAIN if there isn't enough | |
94 | */ | |
95 | spin_lock_irqsave(&opal_write_lock, flags); | |
96 | rc = opal_console_write_buffer_space(vtermno, &len); | |
97 | if (rc || len < total_len) { | |
98 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
99 | /* Closed -> drop characters */ | |
100 | if (rc) | |
101 | return total_len; | |
102 | opal_poll_events(&evt); | |
103 | return -EAGAIN; | |
104 | } | |
105 | ||
106 | /* We still try to handle partial completions, though they | |
107 | * should no longer happen. | |
108 | */ | |
109 | while(total_len > 0 && (rc == OPAL_BUSY || | |
110 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
111 | len = total_len; | |
112 | rc = opal_console_write(vtermno, &len, data); | |
113 | if (rc == OPAL_SUCCESS) { | |
114 | total_len -= len; | |
115 | data += len; | |
116 | written += len; | |
117 | } | |
118 | /* This is a bit nasty but we need that for the console to | |
119 | * flush when there aren't any interrupts. We will clean | |
120 | * things a bit later to limit that to synchronous path | |
121 | * such as the kernel console and xmon/udbg | |
122 | */ | |
123 | do | |
124 | opal_poll_events(&evt); | |
125 | while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT)); | |
126 | } | |
127 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
128 | return written; | |
129 | } | |
130 | ||
131 | static int __init opal_init(void) | |
132 | { | |
133 | struct device_node *np, *consoles; | |
134 | ||
135 | opal_node = of_find_node_by_path("/ibm,opal"); | |
136 | if (!opal_node) { | |
137 | pr_warn("opal: Node not found\n"); | |
138 | return -ENODEV; | |
139 | } | |
140 | if (firmware_has_feature(FW_FEATURE_OPALv2)) | |
141 | consoles = of_find_node_by_path("/ibm,opal/consoles"); | |
142 | else | |
143 | consoles = of_node_get(opal_node); | |
144 | ||
145 | /* Register serial ports */ | |
146 | for_each_child_of_node(consoles, np) { | |
147 | if (strcmp(np->name, "serial")) | |
148 | continue; | |
149 | of_platform_device_create(np, NULL, NULL); | |
150 | } | |
151 | of_node_put(consoles); | |
152 | return 0; | |
153 | } | |
154 | subsys_initcall(opal_init); |