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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 { | |
54 | return hv_console_write((HV_VirtAddr)buf, count); | |
55 | } | |
56 | } | |
57 | ||
867e359b CM |
58 | static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count) |
59 | { | |
bda0f5ba | 60 | return tile_console_write(buf, count); |
867e359b CM |
61 | } |
62 | ||
63 | static int hvc_tile_get_chars(uint32_t vt, char *buf, int count) | |
64 | { | |
65 | int i, c; | |
66 | ||
67 | for (i = 0; i < count; ++i) { | |
68 | c = hv_console_read_if_ready(); | |
69 | if (c < 0) | |
70 | break; | |
71 | buf[i] = c; | |
72 | } | |
73 | ||
74 | return i; | |
75 | } | |
76 | ||
bda0f5ba CM |
77 | #ifdef __tilegx__ |
78 | /* | |
79 | * IRQ based callbacks. | |
80 | */ | |
81 | static int hvc_tile_notifier_add_irq(struct hvc_struct *hp, int irq) | |
82 | { | |
83 | int rc; | |
84 | int cpu = raw_smp_processor_id(); /* Choose an arbitrary cpu */ | |
85 | HV_Coord coord = { .x = cpu_x(cpu), .y = cpu_y(cpu) }; | |
86 | ||
87 | rc = notifier_add_irq(hp, irq); | |
88 | if (rc) | |
89 | return rc; | |
90 | ||
91 | /* | |
92 | * Request that the hypervisor start sending us interrupts. | |
93 | * If the hypervisor returns an error, we still return 0, so that | |
94 | * we can fall back to polling. | |
95 | */ | |
96 | if (hv_console_set_ipi(KERNEL_PL, irq, coord) < 0) | |
97 | notifier_del_irq(hp, irq); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static void hvc_tile_notifier_del_irq(struct hvc_struct *hp, int irq) | |
103 | { | |
104 | HV_Coord coord = { 0, 0 }; | |
105 | ||
106 | /* Tell the hypervisor to stop sending us interrupts. */ | |
107 | hv_console_set_ipi(KERNEL_PL, -1, coord); | |
108 | ||
109 | notifier_del_irq(hp, irq); | |
110 | } | |
111 | ||
112 | static void hvc_tile_notifier_hangup_irq(struct hvc_struct *hp, int irq) | |
113 | { | |
114 | hvc_tile_notifier_del_irq(hp, irq); | |
115 | } | |
116 | #endif | |
117 | ||
867e359b CM |
118 | static const struct hv_ops hvc_tile_get_put_ops = { |
119 | .get_chars = hvc_tile_get_chars, | |
120 | .put_chars = hvc_tile_put_chars, | |
bda0f5ba CM |
121 | #ifdef __tilegx__ |
122 | .notifier_add = hvc_tile_notifier_add_irq, | |
123 | .notifier_del = hvc_tile_notifier_del_irq, | |
124 | .notifier_hangup = hvc_tile_notifier_hangup_irq, | |
125 | #endif | |
126 | }; | |
127 | ||
128 | ||
129 | #ifdef __tilegx__ | |
130 | static int hvc_tile_probe(struct platform_device *pdev) | |
131 | { | |
132 | struct hvc_struct *hp; | |
133 | int tile_hvc_irq; | |
134 | ||
135 | /* Create our IRQ and register it. */ | |
136 | tile_hvc_irq = create_irq(); | |
137 | if (tile_hvc_irq < 0) | |
138 | return -ENXIO; | |
139 | ||
140 | tile_irq_activate(tile_hvc_irq, TILE_IRQ_PERCPU); | |
141 | hp = hvc_alloc(0, tile_hvc_irq, &hvc_tile_get_put_ops, 128); | |
142 | if (IS_ERR(hp)) { | |
143 | destroy_irq(tile_hvc_irq); | |
144 | return PTR_ERR(hp); | |
145 | } | |
146 | dev_set_drvdata(&pdev->dev, hp); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int hvc_tile_remove(struct platform_device *pdev) | |
152 | { | |
153 | int rc; | |
154 | struct hvc_struct *hp = dev_get_drvdata(&pdev->dev); | |
155 | ||
156 | rc = hvc_remove(hp); | |
157 | if (rc == 0) | |
158 | destroy_irq(hp->data); | |
159 | ||
160 | return rc; | |
161 | } | |
162 | ||
163 | static void hvc_tile_shutdown(struct platform_device *pdev) | |
164 | { | |
165 | struct hvc_struct *hp = dev_get_drvdata(&pdev->dev); | |
166 | ||
167 | hvc_tile_notifier_del_irq(hp, hp->data); | |
168 | } | |
169 | ||
170 | static struct platform_device hvc_tile_pdev = { | |
171 | .name = "hvc-tile", | |
172 | .id = 0, | |
173 | }; | |
174 | ||
175 | static struct platform_driver hvc_tile_driver = { | |
176 | .probe = hvc_tile_probe, | |
177 | .remove = hvc_tile_remove, | |
178 | .shutdown = hvc_tile_shutdown, | |
179 | .driver = { | |
180 | .name = "hvc-tile", | |
181 | .owner = THIS_MODULE, | |
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); | |
199 | return IS_ERR(hp) ? PTR_ERR(hp) : 0; | |
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); |