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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 | { | |
71 | struct platform_device *pdev = dev_id; | |
72 | struct goldfish_tty *qtty = &goldfish_ttys[pdev->id]; | |
73 | void __iomem *base = qtty->base; | |
74 | unsigned long irq_flags; | |
75 | unsigned char *buf; | |
76 | u32 count; | |
666b7793 AH |
77 | |
78 | count = readl(base + GOLDFISH_TTY_BYTES_READY); | |
d78055dc | 79 | if (count == 0) |
666b7793 AH |
80 | return IRQ_NONE; |
81 | ||
ebcf0981 AC |
82 | count = tty_prepare_flip_string(&qtty->port, &buf, count); |
83 | spin_lock_irqsave(&qtty->lock, irq_flags); | |
07d783fd | 84 | gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR, |
e0f682e0 | 85 | base + GOLDFISH_TTY_DATA_PTR_HIGH); |
ebcf0981 AC |
86 | writel(count, base + GOLDFISH_TTY_DATA_LEN); |
87 | writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD); | |
88 | spin_unlock_irqrestore(&qtty->lock, irq_flags); | |
89 | tty_schedule_flip(&qtty->port); | |
666b7793 AH |
90 | return IRQ_HANDLED; |
91 | } | |
92 | ||
93 | static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty) | |
94 | { | |
d78055dc A |
95 | struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, |
96 | port); | |
666b7793 AH |
97 | writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD); |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void goldfish_tty_shutdown(struct tty_port *port) | |
102 | { | |
d78055dc A |
103 | struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, |
104 | port); | |
666b7793 AH |
105 | writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD); |
106 | } | |
107 | ||
d78055dc | 108 | static int goldfish_tty_open(struct tty_struct *tty, struct file *filp) |
666b7793 AH |
109 | { |
110 | struct goldfish_tty *qtty = &goldfish_ttys[tty->index]; | |
111 | return tty_port_open(&qtty->port, tty, filp); | |
112 | } | |
113 | ||
d78055dc | 114 | static void goldfish_tty_close(struct tty_struct *tty, struct file *filp) |
666b7793 AH |
115 | { |
116 | tty_port_close(tty->port, tty, filp); | |
117 | } | |
118 | ||
119 | static void goldfish_tty_hangup(struct tty_struct *tty) | |
120 | { | |
121 | tty_port_hangup(tty->port); | |
122 | } | |
123 | ||
d78055dc A |
124 | static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf, |
125 | int count) | |
666b7793 AH |
126 | { |
127 | goldfish_tty_do_write(tty->index, buf, count); | |
128 | return count; | |
129 | } | |
130 | ||
131 | static int goldfish_tty_write_room(struct tty_struct *tty) | |
132 | { | |
133 | return 0x10000; | |
134 | } | |
135 | ||
136 | static int goldfish_tty_chars_in_buffer(struct tty_struct *tty) | |
137 | { | |
138 | struct goldfish_tty *qtty = &goldfish_ttys[tty->index]; | |
139 | void __iomem *base = qtty->base; | |
140 | return readl(base + GOLDFISH_TTY_BYTES_READY); | |
141 | } | |
142 | ||
d78055dc A |
143 | static void goldfish_tty_console_write(struct console *co, const char *b, |
144 | unsigned count) | |
666b7793 AH |
145 | { |
146 | goldfish_tty_do_write(co->index, b, count); | |
147 | } | |
148 | ||
d78055dc A |
149 | static struct tty_driver *goldfish_tty_console_device(struct console *c, |
150 | int *index) | |
666b7793 AH |
151 | { |
152 | *index = c->index; | |
153 | return goldfish_tty_driver; | |
154 | } | |
155 | ||
156 | static int goldfish_tty_console_setup(struct console *co, char *options) | |
157 | { | |
fda2b418 | 158 | if ((unsigned)co->index >= goldfish_tty_line_count) |
666b7793 | 159 | return -ENODEV; |
a4dc9236 | 160 | if (!goldfish_ttys[co->index].base) |
666b7793 AH |
161 | return -ENODEV; |
162 | return 0; | |
163 | } | |
164 | ||
165 | static struct tty_port_operations goldfish_port_ops = { | |
166 | .activate = goldfish_tty_activate, | |
167 | .shutdown = goldfish_tty_shutdown | |
168 | }; | |
169 | ||
d78055dc | 170 | static const struct tty_operations goldfish_tty_ops = { |
666b7793 AH |
171 | .open = goldfish_tty_open, |
172 | .close = goldfish_tty_close, | |
173 | .hangup = goldfish_tty_hangup, | |
174 | .write = goldfish_tty_write, | |
175 | .write_room = goldfish_tty_write_room, | |
176 | .chars_in_buffer = goldfish_tty_chars_in_buffer, | |
177 | }; | |
178 | ||
179 | static int goldfish_tty_create_driver(void) | |
180 | { | |
181 | int ret; | |
182 | struct tty_driver *tty; | |
183 | ||
d78055dc A |
184 | goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) * |
185 | goldfish_tty_line_count, GFP_KERNEL); | |
186 | if (goldfish_ttys == NULL) { | |
666b7793 AH |
187 | ret = -ENOMEM; |
188 | goto err_alloc_goldfish_ttys_failed; | |
189 | } | |
190 | tty = alloc_tty_driver(goldfish_tty_line_count); | |
d78055dc | 191 | if (tty == NULL) { |
666b7793 AH |
192 | ret = -ENOMEM; |
193 | goto err_alloc_tty_driver_failed; | |
194 | } | |
195 | tty->driver_name = "goldfish"; | |
196 | tty->name = "ttyGF"; | |
197 | tty->type = TTY_DRIVER_TYPE_SERIAL; | |
198 | tty->subtype = SERIAL_TYPE_NORMAL; | |
199 | tty->init_termios = tty_std_termios; | |
d78055dc A |
200 | tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
201 | TTY_DRIVER_DYNAMIC_DEV; | |
666b7793 AH |
202 | tty_set_operations(tty, &goldfish_tty_ops); |
203 | ret = tty_register_driver(tty); | |
d78055dc | 204 | if (ret) |
666b7793 AH |
205 | goto err_tty_register_driver_failed; |
206 | ||
207 | goldfish_tty_driver = tty; | |
208 | return 0; | |
209 | ||
210 | err_tty_register_driver_failed: | |
211 | put_tty_driver(tty); | |
212 | err_alloc_tty_driver_failed: | |
213 | kfree(goldfish_ttys); | |
214 | goldfish_ttys = NULL; | |
215 | err_alloc_goldfish_ttys_failed: | |
216 | return ret; | |
217 | } | |
218 | ||
219 | static void goldfish_tty_delete_driver(void) | |
220 | { | |
221 | tty_unregister_driver(goldfish_tty_driver); | |
222 | put_tty_driver(goldfish_tty_driver); | |
223 | goldfish_tty_driver = NULL; | |
224 | kfree(goldfish_ttys); | |
225 | goldfish_ttys = NULL; | |
226 | } | |
227 | ||
228 | static int goldfish_tty_probe(struct platform_device *pdev) | |
229 | { | |
230 | struct goldfish_tty *qtty; | |
231 | int ret = -EINVAL; | |
666b7793 AH |
232 | struct resource *r; |
233 | struct device *ttydev; | |
234 | void __iomem *base; | |
235 | u32 irq; | |
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 | ||
d78055dc | 251 | if (pdev->id >= goldfish_tty_line_count) |
666b7793 AH |
252 | goto err_unmap; |
253 | ||
254 | mutex_lock(&goldfish_tty_lock); | |
d78055dc | 255 | if (goldfish_tty_current_line_count == 0) { |
666b7793 | 256 | ret = goldfish_tty_create_driver(); |
d78055dc | 257 | if (ret) |
666b7793 AH |
258 | goto err_create_driver_failed; |
259 | } | |
260 | goldfish_tty_current_line_count++; | |
261 | ||
262 | qtty = &goldfish_ttys[pdev->id]; | |
263 | spin_lock_init(&qtty->lock); | |
264 | tty_port_init(&qtty->port); | |
265 | qtty->port.ops = &goldfish_port_ops; | |
266 | qtty->base = base; | |
267 | qtty->irq = irq; | |
268 | ||
269 | writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD); | |
270 | ||
d78055dc A |
271 | ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, |
272 | "goldfish_tty", pdev); | |
273 | if (ret) | |
666b7793 AH |
274 | goto err_request_irq_failed; |
275 | ||
276 | ||
277 | ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver, | |
278 | pdev->id, &pdev->dev); | |
d78055dc | 279 | if (IS_ERR(ttydev)) { |
666b7793 AH |
280 | ret = PTR_ERR(ttydev); |
281 | goto err_tty_register_device_failed; | |
282 | } | |
283 | ||
284 | strcpy(qtty->console.name, "ttyGF"); | |
285 | qtty->console.write = goldfish_tty_console_write; | |
286 | qtty->console.device = goldfish_tty_console_device; | |
287 | qtty->console.setup = goldfish_tty_console_setup; | |
288 | qtty->console.flags = CON_PRINTBUFFER; | |
289 | qtty->console.index = pdev->id; | |
290 | register_console(&qtty->console); | |
291 | ||
292 | mutex_unlock(&goldfish_tty_lock); | |
293 | return 0; | |
294 | ||
666b7793 AH |
295 | err_tty_register_device_failed: |
296 | free_irq(irq, pdev); | |
297 | err_request_irq_failed: | |
298 | goldfish_tty_current_line_count--; | |
d78055dc | 299 | if (goldfish_tty_current_line_count == 0) |
666b7793 AH |
300 | goldfish_tty_delete_driver(); |
301 | err_create_driver_failed: | |
302 | mutex_unlock(&goldfish_tty_lock); | |
303 | err_unmap: | |
304 | iounmap(base); | |
305 | return ret; | |
306 | } | |
307 | ||
308 | static int goldfish_tty_remove(struct platform_device *pdev) | |
309 | { | |
310 | struct goldfish_tty *qtty; | |
311 | ||
312 | mutex_lock(&goldfish_tty_lock); | |
313 | ||
314 | qtty = &goldfish_ttys[pdev->id]; | |
315 | unregister_console(&qtty->console); | |
316 | tty_unregister_device(goldfish_tty_driver, pdev->id); | |
317 | iounmap(qtty->base); | |
a4dc9236 | 318 | qtty->base = NULL; |
666b7793 AH |
319 | free_irq(qtty->irq, pdev); |
320 | goldfish_tty_current_line_count--; | |
d78055dc | 321 | if (goldfish_tty_current_line_count == 0) |
666b7793 AH |
322 | goldfish_tty_delete_driver(); |
323 | mutex_unlock(&goldfish_tty_lock); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static struct platform_driver goldfish_tty_platform_driver = { | |
328 | .probe = goldfish_tty_probe, | |
329 | .remove = goldfish_tty_remove, | |
330 | .driver = { | |
331 | .name = "goldfish_tty" | |
332 | } | |
333 | }; | |
334 | ||
335 | module_platform_driver(goldfish_tty_platform_driver); | |
336 | ||
337 | MODULE_LICENSE("GPL v2"); |