Commit | Line | Data |
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867e359b | 1 | /* |
ef06f55a | 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. |
867e359b | 3 | * |
ef06f55a CM |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
867e359b | 7 | * |
ef06f55a CM |
8 | * This program is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
867e359b CM |
13 | * |
14 | * Tilera TILE Processor hypervisor console | |
15 | */ | |
16 | ||
17 | #include <linux/console.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/init.h> | |
bda0f5ba CM |
21 | #include <linux/interrupt.h> |
22 | #include <linux/irq.h> | |
867e359b | 23 | #include <linux/moduleparam.h> |
bda0f5ba | 24 | #include <linux/platform_device.h> |
867e359b CM |
25 | #include <linux/types.h> |
26 | ||
bda0f5ba CM |
27 | #include <asm/setup.h> |
28 | #include <arch/sim_def.h> | |
29 | ||
867e359b CM |
30 | #include <hv/hypervisor.h> |
31 | ||
32 | #include "hvc_console.h" | |
33 | ||
bda0f5ba CM |
34 | static int use_sim_console; |
35 | static int __init sim_console(char *str) | |
36 | { | |
37 | use_sim_console = 1; | |
38 | return 0; | |
39 | } | |
40 | early_param("sim_console", sim_console); | |
41 | ||
42 | int tile_console_write(const char *buf, int count) | |
43 | { | |
44 | if (unlikely(use_sim_console)) { | |
45 | int i; | |
46 | for (i = 0; i < count; ++i) | |
47 | __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC | | |
48 | (buf[i] << _SIM_CONTROL_OPERATOR_BITS)); | |
49 | __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC | | |
50 | (SIM_PUTC_FLUSH_BINARY << | |
51 | _SIM_CONTROL_OPERATOR_BITS)); | |
52 | return 0; | |
53 | } else { | |
b4287df8 CM |
54 | /* Translate 0 bytes written to EAGAIN for hvc_console_print. */ |
55 | return hv_console_write((HV_VirtAddr)buf, count) ?: -EAGAIN; | |
bda0f5ba CM |
56 | } |
57 | } | |
58 | ||
867e359b CM |
59 | static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count) |
60 | { | |
bda0f5ba | 61 | return tile_console_write(buf, count); |
867e359b CM |
62 | } |
63 | ||
64 | static int hvc_tile_get_chars(uint32_t vt, char *buf, int count) | |
65 | { | |
66 | int i, c; | |
67 | ||
68 | for (i = 0; i < count; ++i) { | |
69 | c = hv_console_read_if_ready(); | |
70 | if (c < 0) | |
71 | break; | |
72 | buf[i] = c; | |
73 | } | |
74 | ||
75 | return i; | |
76 | } | |
77 | ||
bda0f5ba CM |
78 | #ifdef __tilegx__ |
79 | /* | |
80 | * IRQ based callbacks. | |
81 | */ | |
82 | static int hvc_tile_notifier_add_irq(struct hvc_struct *hp, int irq) | |
83 | { | |
84 | int rc; | |
85 | int cpu = raw_smp_processor_id(); /* Choose an arbitrary cpu */ | |
86 | HV_Coord coord = { .x = cpu_x(cpu), .y = cpu_y(cpu) }; | |
87 | ||
88 | rc = notifier_add_irq(hp, irq); | |
89 | if (rc) | |
90 | return rc; | |
91 | ||
92 | /* | |
93 | * Request that the hypervisor start sending us interrupts. | |
94 | * If the hypervisor returns an error, we still return 0, so that | |
95 | * we can fall back to polling. | |
96 | */ | |
97 | if (hv_console_set_ipi(KERNEL_PL, irq, coord) < 0) | |
98 | notifier_del_irq(hp, irq); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static void hvc_tile_notifier_del_irq(struct hvc_struct *hp, int irq) | |
104 | { | |
105 | HV_Coord coord = { 0, 0 }; | |
106 | ||
107 | /* Tell the hypervisor to stop sending us interrupts. */ | |
108 | hv_console_set_ipi(KERNEL_PL, -1, coord); | |
109 | ||
110 | notifier_del_irq(hp, irq); | |
111 | } | |
112 | ||
113 | static void hvc_tile_notifier_hangup_irq(struct hvc_struct *hp, int irq) | |
114 | { | |
115 | hvc_tile_notifier_del_irq(hp, irq); | |
116 | } | |
117 | #endif | |
118 | ||
867e359b CM |
119 | static const struct hv_ops hvc_tile_get_put_ops = { |
120 | .get_chars = hvc_tile_get_chars, | |
121 | .put_chars = hvc_tile_put_chars, | |
bda0f5ba CM |
122 | #ifdef __tilegx__ |
123 | .notifier_add = hvc_tile_notifier_add_irq, | |
124 | .notifier_del = hvc_tile_notifier_del_irq, | |
125 | .notifier_hangup = hvc_tile_notifier_hangup_irq, | |
126 | #endif | |
127 | }; | |
128 | ||
129 | ||
130 | #ifdef __tilegx__ | |
131 | static int hvc_tile_probe(struct platform_device *pdev) | |
132 | { | |
133 | struct hvc_struct *hp; | |
134 | int tile_hvc_irq; | |
135 | ||
136 | /* Create our IRQ and register it. */ | |
3dfd442e TG |
137 | tile_hvc_irq = irq_alloc_hwirq(-1); |
138 | if (!tile_hvc_irq) | |
bda0f5ba CM |
139 | return -ENXIO; |
140 | ||
141 | tile_irq_activate(tile_hvc_irq, TILE_IRQ_PERCPU); | |
142 | hp = hvc_alloc(0, tile_hvc_irq, &hvc_tile_get_put_ops, 128); | |
143 | if (IS_ERR(hp)) { | |
3dfd442e | 144 | irq_free_hwirq(tile_hvc_irq); |
bda0f5ba CM |
145 | return PTR_ERR(hp); |
146 | } | |
147 | dev_set_drvdata(&pdev->dev, hp); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int hvc_tile_remove(struct platform_device *pdev) | |
153 | { | |
154 | int rc; | |
155 | struct hvc_struct *hp = dev_get_drvdata(&pdev->dev); | |
156 | ||
157 | rc = hvc_remove(hp); | |
158 | if (rc == 0) | |
3dfd442e | 159 | irq_free_hwirq(hp->data); |
bda0f5ba CM |
160 | |
161 | return rc; | |
162 | } | |
163 | ||
164 | static void hvc_tile_shutdown(struct platform_device *pdev) | |
165 | { | |
166 | struct hvc_struct *hp = dev_get_drvdata(&pdev->dev); | |
167 | ||
168 | hvc_tile_notifier_del_irq(hp, hp->data); | |
169 | } | |
170 | ||
171 | static struct platform_device hvc_tile_pdev = { | |
172 | .name = "hvc-tile", | |
173 | .id = 0, | |
174 | }; | |
175 | ||
176 | static struct platform_driver hvc_tile_driver = { | |
177 | .probe = hvc_tile_probe, | |
178 | .remove = hvc_tile_remove, | |
179 | .shutdown = hvc_tile_shutdown, | |
180 | .driver = { | |
181 | .name = "hvc-tile", | |
bda0f5ba | 182 | } |
867e359b | 183 | }; |
bda0f5ba | 184 | #endif |
867e359b CM |
185 | |
186 | static int __init hvc_tile_console_init(void) | |
187 | { | |
867e359b CM |
188 | hvc_instantiate(0, 0, &hvc_tile_get_put_ops); |
189 | add_preferred_console("hvc", 0, NULL); | |
867e359b CM |
190 | return 0; |
191 | } | |
192 | console_initcall(hvc_tile_console_init); | |
193 | ||
194 | static int __init hvc_tile_init(void) | |
195 | { | |
bda0f5ba CM |
196 | #ifndef __tilegx__ |
197 | struct hvc_struct *hp; | |
198 | hp = hvc_alloc(0, 0, &hvc_tile_get_put_ops, 128); | |
60f917b8 | 199 | return PTR_ERR_OR_ZERO(hp); |
bda0f5ba CM |
200 | #else |
201 | platform_device_register(&hvc_tile_pdev); | |
202 | return platform_driver_register(&hvc_tile_driver); | |
203 | #endif | |
867e359b CM |
204 | } |
205 | device_initcall(hvc_tile_init); |