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666b7793 AH |
1 | /* |
2 | * Copyright (C) 2007 Google, Inc. | |
3 | * Copyright (C) 2012 Intel, Inc. | |
4 | * | |
5 | * This software is licensed under the terms of the GNU General Public | |
6 | * License version 2, as published by the Free Software Foundation, and | |
7 | * may be copied, distributed, and modified under those terms. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/console.h> | |
666b7793 AH |
17 | #include <linux/interrupt.h> |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/tty.h> | |
20 | #include <linux/tty_flip.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/module.h> | |
e0f682e0 | 24 | #include <linux/goldfish.h> |
666b7793 AH |
25 | |
26 | enum { | |
27 | GOLDFISH_TTY_PUT_CHAR = 0x00, | |
28 | GOLDFISH_TTY_BYTES_READY = 0x04, | |
29 | GOLDFISH_TTY_CMD = 0x08, | |
30 | ||
31 | GOLDFISH_TTY_DATA_PTR = 0x10, | |
32 | GOLDFISH_TTY_DATA_LEN = 0x14, | |
b8658bc8 | 33 | GOLDFISH_TTY_DATA_PTR_HIGH = 0x18, |
666b7793 AH |
34 | |
35 | GOLDFISH_TTY_CMD_INT_DISABLE = 0, | |
36 | GOLDFISH_TTY_CMD_INT_ENABLE = 1, | |
37 | GOLDFISH_TTY_CMD_WRITE_BUFFER = 2, | |
38 | GOLDFISH_TTY_CMD_READ_BUFFER = 3, | |
39 | }; | |
40 | ||
41 | struct goldfish_tty { | |
42 | struct tty_port port; | |
43 | spinlock_t lock; | |
44 | void __iomem *base; | |
45 | u32 irq; | |
46 | int opencount; | |
47 | struct console console; | |
48 | }; | |
49 | ||
50 | static DEFINE_MUTEX(goldfish_tty_lock); | |
51 | static struct tty_driver *goldfish_tty_driver; | |
52 | static u32 goldfish_tty_line_count = 8; | |
53 | static u32 goldfish_tty_current_line_count; | |
54 | static struct goldfish_tty *goldfish_ttys; | |
55 | ||
56 | static void goldfish_tty_do_write(int line, const char *buf, unsigned count) | |
57 | { | |
58 | unsigned long irq_flags; | |
59 | struct goldfish_tty *qtty = &goldfish_ttys[line]; | |
60 | void __iomem *base = qtty->base; | |
61 | spin_lock_irqsave(&qtty->lock, irq_flags); | |
07d783fd | 62 | gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR, |
e0f682e0 | 63 | base + GOLDFISH_TTY_DATA_PTR_HIGH); |
666b7793 AH |
64 | writel(count, base + GOLDFISH_TTY_DATA_LEN); |
65 | writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD); | |
66 | spin_unlock_irqrestore(&qtty->lock, irq_flags); | |
67 | } | |
68 | ||
69 | static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id) | |
70 | { | |
465893e1 | 71 | struct goldfish_tty *qtty = dev_id; |
666b7793 AH |
72 | void __iomem *base = qtty->base; |
73 | unsigned long irq_flags; | |
74 | unsigned char *buf; | |
75 | u32 count; | |
666b7793 AH |
76 | |
77 | count = readl(base + GOLDFISH_TTY_BYTES_READY); | |
d78055dc | 78 | if (count == 0) |
666b7793 AH |
79 | return IRQ_NONE; |
80 | ||
ebcf0981 AC |
81 | count = tty_prepare_flip_string(&qtty->port, &buf, count); |
82 | spin_lock_irqsave(&qtty->lock, irq_flags); | |
07d783fd | 83 | gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR, |
e0f682e0 | 84 | base + GOLDFISH_TTY_DATA_PTR_HIGH); |
ebcf0981 AC |
85 | writel(count, base + GOLDFISH_TTY_DATA_LEN); |
86 | writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD); | |
87 | spin_unlock_irqrestore(&qtty->lock, irq_flags); | |
88 | tty_schedule_flip(&qtty->port); | |
666b7793 AH |
89 | return IRQ_HANDLED; |
90 | } | |
91 | ||
92 | static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty) | |
93 | { | |
d78055dc A |
94 | struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, |
95 | port); | |
666b7793 AH |
96 | writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD); |
97 | return 0; | |
98 | } | |
99 | ||
100 | static void goldfish_tty_shutdown(struct tty_port *port) | |
101 | { | |
d78055dc A |
102 | struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, |
103 | port); | |
666b7793 AH |
104 | writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD); |
105 | } | |
106 | ||
d78055dc | 107 | static int goldfish_tty_open(struct tty_struct *tty, struct file *filp) |
666b7793 AH |
108 | { |
109 | struct goldfish_tty *qtty = &goldfish_ttys[tty->index]; | |
110 | return tty_port_open(&qtty->port, tty, filp); | |
111 | } | |
112 | ||
d78055dc | 113 | static void goldfish_tty_close(struct tty_struct *tty, struct file *filp) |
666b7793 AH |
114 | { |
115 | tty_port_close(tty->port, tty, filp); | |
116 | } | |
117 | ||
118 | static void goldfish_tty_hangup(struct tty_struct *tty) | |
119 | { | |
120 | tty_port_hangup(tty->port); | |
121 | } | |
122 | ||
d78055dc A |
123 | static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf, |
124 | int count) | |
666b7793 AH |
125 | { |
126 | goldfish_tty_do_write(tty->index, buf, count); | |
127 | return count; | |
128 | } | |
129 | ||
130 | static int goldfish_tty_write_room(struct tty_struct *tty) | |
131 | { | |
132 | return 0x10000; | |
133 | } | |
134 | ||
135 | static int goldfish_tty_chars_in_buffer(struct tty_struct *tty) | |
136 | { | |
137 | struct goldfish_tty *qtty = &goldfish_ttys[tty->index]; | |
138 | void __iomem *base = qtty->base; | |
139 | return readl(base + GOLDFISH_TTY_BYTES_READY); | |
140 | } | |
141 | ||
d78055dc A |
142 | static void goldfish_tty_console_write(struct console *co, const char *b, |
143 | unsigned count) | |
666b7793 AH |
144 | { |
145 | goldfish_tty_do_write(co->index, b, count); | |
146 | } | |
147 | ||
d78055dc A |
148 | static struct tty_driver *goldfish_tty_console_device(struct console *c, |
149 | int *index) | |
666b7793 AH |
150 | { |
151 | *index = c->index; | |
152 | return goldfish_tty_driver; | |
153 | } | |
154 | ||
155 | static int goldfish_tty_console_setup(struct console *co, char *options) | |
156 | { | |
fda2b418 | 157 | if ((unsigned)co->index >= goldfish_tty_line_count) |
666b7793 | 158 | return -ENODEV; |
a4dc9236 | 159 | if (!goldfish_ttys[co->index].base) |
666b7793 AH |
160 | return -ENODEV; |
161 | return 0; | |
162 | } | |
163 | ||
04b757df | 164 | static const struct tty_port_operations goldfish_port_ops = { |
666b7793 AH |
165 | .activate = goldfish_tty_activate, |
166 | .shutdown = goldfish_tty_shutdown | |
167 | }; | |
168 | ||
d78055dc | 169 | static const struct tty_operations goldfish_tty_ops = { |
666b7793 AH |
170 | .open = goldfish_tty_open, |
171 | .close = goldfish_tty_close, | |
172 | .hangup = goldfish_tty_hangup, | |
173 | .write = goldfish_tty_write, | |
174 | .write_room = goldfish_tty_write_room, | |
175 | .chars_in_buffer = goldfish_tty_chars_in_buffer, | |
176 | }; | |
177 | ||
178 | static int goldfish_tty_create_driver(void) | |
179 | { | |
180 | int ret; | |
181 | struct tty_driver *tty; | |
182 | ||
d78055dc A |
183 | goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) * |
184 | goldfish_tty_line_count, GFP_KERNEL); | |
185 | if (goldfish_ttys == NULL) { | |
666b7793 AH |
186 | ret = -ENOMEM; |
187 | goto err_alloc_goldfish_ttys_failed; | |
188 | } | |
189 | tty = alloc_tty_driver(goldfish_tty_line_count); | |
d78055dc | 190 | if (tty == NULL) { |
666b7793 AH |
191 | ret = -ENOMEM; |
192 | goto err_alloc_tty_driver_failed; | |
193 | } | |
194 | tty->driver_name = "goldfish"; | |
195 | tty->name = "ttyGF"; | |
196 | tty->type = TTY_DRIVER_TYPE_SERIAL; | |
197 | tty->subtype = SERIAL_TYPE_NORMAL; | |
198 | tty->init_termios = tty_std_termios; | |
d78055dc A |
199 | tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
200 | TTY_DRIVER_DYNAMIC_DEV; | |
666b7793 AH |
201 | tty_set_operations(tty, &goldfish_tty_ops); |
202 | ret = tty_register_driver(tty); | |
d78055dc | 203 | if (ret) |
666b7793 AH |
204 | goto err_tty_register_driver_failed; |
205 | ||
206 | goldfish_tty_driver = tty; | |
207 | return 0; | |
208 | ||
209 | err_tty_register_driver_failed: | |
210 | put_tty_driver(tty); | |
211 | err_alloc_tty_driver_failed: | |
212 | kfree(goldfish_ttys); | |
213 | goldfish_ttys = NULL; | |
214 | err_alloc_goldfish_ttys_failed: | |
215 | return ret; | |
216 | } | |
217 | ||
218 | static void goldfish_tty_delete_driver(void) | |
219 | { | |
220 | tty_unregister_driver(goldfish_tty_driver); | |
221 | put_tty_driver(goldfish_tty_driver); | |
222 | goldfish_tty_driver = NULL; | |
223 | kfree(goldfish_ttys); | |
224 | goldfish_ttys = NULL; | |
225 | } | |
226 | ||
227 | static int goldfish_tty_probe(struct platform_device *pdev) | |
228 | { | |
229 | struct goldfish_tty *qtty; | |
230 | int ret = -EINVAL; | |
666b7793 AH |
231 | struct resource *r; |
232 | struct device *ttydev; | |
233 | void __iomem *base; | |
234 | u32 irq; | |
465893e1 | 235 | unsigned int line; |
666b7793 AH |
236 | |
237 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
d78055dc | 238 | if (r == NULL) |
666b7793 AH |
239 | return -EINVAL; |
240 | ||
241 | base = ioremap(r->start, 0x1000); | |
242 | if (base == NULL) | |
243 | pr_err("goldfish_tty: unable to remap base\n"); | |
244 | ||
245 | r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
d78055dc | 246 | if (r == NULL) |
666b7793 AH |
247 | goto err_unmap; |
248 | ||
249 | irq = r->start; | |
250 | ||
666b7793 | 251 | mutex_lock(&goldfish_tty_lock); |
465893e1 GH |
252 | |
253 | if (pdev->id == PLATFORM_DEVID_NONE) | |
254 | line = goldfish_tty_current_line_count; | |
255 | else | |
256 | line = pdev->id; | |
257 | ||
258 | if (line >= goldfish_tty_line_count) | |
259 | goto err_create_driver_failed; | |
260 | ||
d78055dc | 261 | if (goldfish_tty_current_line_count == 0) { |
666b7793 | 262 | ret = goldfish_tty_create_driver(); |
d78055dc | 263 | if (ret) |
666b7793 AH |
264 | goto err_create_driver_failed; |
265 | } | |
266 | goldfish_tty_current_line_count++; | |
267 | ||
465893e1 | 268 | qtty = &goldfish_ttys[line]; |
666b7793 AH |
269 | spin_lock_init(&qtty->lock); |
270 | tty_port_init(&qtty->port); | |
271 | qtty->port.ops = &goldfish_port_ops; | |
272 | qtty->base = base; | |
273 | qtty->irq = irq; | |
274 | ||
275 | writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD); | |
276 | ||
d78055dc | 277 | ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, |
465893e1 | 278 | "goldfish_tty", qtty); |
d78055dc | 279 | if (ret) |
666b7793 AH |
280 | goto err_request_irq_failed; |
281 | ||
282 | ||
283 | ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver, | |
465893e1 | 284 | line, &pdev->dev); |
d78055dc | 285 | if (IS_ERR(ttydev)) { |
666b7793 AH |
286 | ret = PTR_ERR(ttydev); |
287 | goto err_tty_register_device_failed; | |
288 | } | |
289 | ||
290 | strcpy(qtty->console.name, "ttyGF"); | |
291 | qtty->console.write = goldfish_tty_console_write; | |
292 | qtty->console.device = goldfish_tty_console_device; | |
293 | qtty->console.setup = goldfish_tty_console_setup; | |
294 | qtty->console.flags = CON_PRINTBUFFER; | |
465893e1 | 295 | qtty->console.index = line; |
666b7793 | 296 | register_console(&qtty->console); |
465893e1 | 297 | platform_set_drvdata(pdev, qtty); |
666b7793 AH |
298 | |
299 | mutex_unlock(&goldfish_tty_lock); | |
300 | return 0; | |
301 | ||
666b7793 AH |
302 | err_tty_register_device_failed: |
303 | free_irq(irq, pdev); | |
304 | err_request_irq_failed: | |
305 | goldfish_tty_current_line_count--; | |
d78055dc | 306 | if (goldfish_tty_current_line_count == 0) |
666b7793 AH |
307 | goldfish_tty_delete_driver(); |
308 | err_create_driver_failed: | |
309 | mutex_unlock(&goldfish_tty_lock); | |
310 | err_unmap: | |
311 | iounmap(base); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | static int goldfish_tty_remove(struct platform_device *pdev) | |
316 | { | |
465893e1 | 317 | struct goldfish_tty *qtty = platform_get_drvdata(pdev); |
666b7793 AH |
318 | |
319 | mutex_lock(&goldfish_tty_lock); | |
320 | ||
666b7793 | 321 | unregister_console(&qtty->console); |
465893e1 | 322 | tty_unregister_device(goldfish_tty_driver, qtty->console.index); |
666b7793 | 323 | iounmap(qtty->base); |
a4dc9236 | 324 | qtty->base = NULL; |
666b7793 AH |
325 | free_irq(qtty->irq, pdev); |
326 | goldfish_tty_current_line_count--; | |
d78055dc | 327 | if (goldfish_tty_current_line_count == 0) |
666b7793 AH |
328 | goldfish_tty_delete_driver(); |
329 | mutex_unlock(&goldfish_tty_lock); | |
330 | return 0; | |
331 | } | |
332 | ||
9b883eea MD |
333 | static const struct of_device_id goldfish_tty_of_match[] = { |
334 | { .compatible = "google,goldfish-tty", }, | |
335 | {}, | |
336 | }; | |
337 | ||
338 | MODULE_DEVICE_TABLE(of, goldfish_tty_of_match); | |
339 | ||
666b7793 AH |
340 | static struct platform_driver goldfish_tty_platform_driver = { |
341 | .probe = goldfish_tty_probe, | |
342 | .remove = goldfish_tty_remove, | |
343 | .driver = { | |
9b883eea MD |
344 | .name = "goldfish_tty", |
345 | .of_match_table = goldfish_tty_of_match, | |
666b7793 AH |
346 | } |
347 | }; | |
348 | ||
349 | module_platform_driver(goldfish_tty_platform_driver); | |
350 | ||
351 | MODULE_LICENSE("GPL v2"); |