0122--ARM-goldfish-tty-Adding-tty-driver-for-goldfish.patch

   1 From 4ff5a10b94c0c41088c8bbfa5be1ebab3822371b Mon Sep 17 00:00:00 2001
   2 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@google.com>
   3 Date: Fri, 29 Jun 2007 21:41:20 -0700
   4 Subject: [PATCH 122/134] [ARM] goldfish: tty: Adding tty driver for goldfish.
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=utf-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Mike A. Chan <mikechan@google.com>
  10 Signed-off-by: Arve Hjønnevåg <arve@android.com>
  11 ---
  12  drivers/char/Kconfig        |    6 +
  13  drivers/char/Makefile       |    1 +
  14  drivers/char/goldfish_tty.c |  323 +++++++++++++++++++++++++++++++++++++++++++
  15  3 files changed, 330 insertions(+), 0 deletions(-)
  16  create mode 100644 drivers/char/goldfish_tty.c
  17
  18 --- a/drivers/char/Kconfig
  19 +++ b/drivers/char/Kconfig
  20 @@ -1106,6 +1106,12 @@ config DEVPORT
  21         depends on ISA || PCI
  22         default y
  23
  24 +config GOLDFISH_TTY
  25 +       tristate "Goldfish TTY Driver"
  26 +       default n
  27 +       help
  28 +         TTY driver for Goldfish Virtual Platform.
  29 +
  30  source "drivers/s390/char/Kconfig"
  31
  32  endmenu
  33 --- a/drivers/char/Makefile
  34 +++ b/drivers/char/Makefile
  35 @@ -98,6 +98,7 @@ obj-$(CONFIG_GPIO_DEVICE)     += gpio_dev.o
  36  obj-$(CONFIG_GPIO_VR41XX)      += vr41xx_giu.o
  37  obj-$(CONFIG_GPIO_TB0219)      += tb0219.o
  38  obj-$(CONFIG_TELCLOCK)         += tlclk.o
  39 +obj-$(CONFIG_GOLDFISH_TTY)     += goldfish_tty.o
  40
  41  obj-$(CONFIG_MWAVE)            += mwave/
  42  obj-$(CONFIG_AGP)              += agp/
  43 --- /dev/null
  44 +++ b/drivers/char/goldfish_tty.c
  45 @@ -0,0 +1,323 @@
  46 +/* drivers/char/goldfish_tty.c
  47 +**
  48 +** Copyright (C) 2007 Google, Inc.
  49 +**
  50 +** This software is licensed under the terms of the GNU General Public
  51 +** License version 2, as published by the Free Software Foundation, and
  52 +** may be copied, distributed, and modified under those terms.
  53 +**
  54 +** This program is distributed in the hope that it will be useful,
  55 +** but WITHOUT ANY WARRANTY; without even the implied warranty of
  56 +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  57 +** GNU General Public License for more details.
  58 +**
  59 +*/
  60 +
  61 +#include <linux/console.h>
  62 +#include <linux/init.h>
  63 +#include <linux/interrupt.h>
  64 +#include <linux/platform_device.h>
  65 +#include <linux/tty.h>
  66 +#include <linux/tty_flip.h>
  67 +
  68 +#include <mach/hardware.h>
  69 +#include <asm/io.h>
  70 +
  71 +enum {
  72 +       GOLDFISH_TTY_PUT_CHAR       = 0x00,
  73 +       GOLDFISH_TTY_BYTES_READY    = 0x04,
  74 +       GOLDFISH_TTY_CMD            = 0x08,
  75 +
  76 +       GOLDFISH_TTY_DATA_PTR       = 0x10,
  77 +       GOLDFISH_TTY_DATA_LEN       = 0x14,
  78 +
  79 +       GOLDFISH_TTY_CMD_INT_DISABLE    = 0,
  80 +       GOLDFISH_TTY_CMD_INT_ENABLE     = 1,
  81 +       GOLDFISH_TTY_CMD_WRITE_BUFFER   = 2,
  82 +       GOLDFISH_TTY_CMD_READ_BUFFER    = 3,
  83 +};
  84 +
  85 +struct goldfish_tty {
  86 +       spinlock_t lock;
  87 +       uint32_t base;
  88 +       uint32_t irq;
  89 +       int opencount;
  90 +       struct tty_struct *tty;
  91 +       struct console console;
  92 +};
  93 +
  94 +static DEFINE_MUTEX(goldfish_tty_lock);
  95 +static struct tty_driver *goldfish_tty_driver;
  96 +static uint32_t goldfish_tty_line_count = 8;
  97 +static uint32_t goldfish_tty_current_line_count;
  98 +static struct goldfish_tty *goldfish_ttys;
  99 +
 100 +static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
 101 +{
 102 +       unsigned long irq_flags;
 103 +       struct goldfish_tty *qtty = &goldfish_ttys[line];
 104 +       uint32_t base = qtty->base;
 105 +       spin_lock_irqsave(&qtty->lock, irq_flags);
 106 +       writel(buf, base + GOLDFISH_TTY_DATA_PTR);
 107 +       writel(count, base + GOLDFISH_TTY_DATA_LEN);
 108 +       writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
 109 +       spin_unlock_irqrestore(&qtty->lock, irq_flags);
 110 +}
 111 +
 112 +static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
 113 +{
 114 +       struct platform_device *pdev = dev_id;
 115 +       struct goldfish_tty *qtty = &goldfish_ttys[pdev->id];
 116 +       uint32_t base = qtty->base;
 117 +       unsigned long irq_flags;
 118 +       unsigned char *buf;
 119 +       uint32_t count;
 120 +
 121 +       count = readl(base + GOLDFISH_TTY_BYTES_READY);
 122 +       if(count == 0) {
 123 +               return IRQ_NONE;
 124 +       }
 125 +       count = tty_prepare_flip_string(qtty->tty, &buf, count);
 126 +       spin_lock_irqsave(&qtty->lock, irq_flags);
 127 +       writel(buf, base + GOLDFISH_TTY_DATA_PTR);
 128 +       writel(count, base + GOLDFISH_TTY_DATA_LEN);
 129 +       writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
 130 +       spin_unlock_irqrestore(&qtty->lock, irq_flags);
 131 +       tty_schedule_flip(qtty->tty);
 132 +       return IRQ_HANDLED;
 133 +}
 134 +
 135 +static int goldfish_tty_open(struct tty_struct * tty, struct file * filp)
 136 +{
 137 +       int ret;
 138 +       struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
 139 +
 140 +       mutex_lock(&goldfish_tty_lock);
 141 +       if(qtty->tty == NULL || qtty->tty == tty) {
 142 +               if(qtty->opencount++ == 0) {
 143 +                       qtty->tty = tty;
 144 +                       writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
 145 +               }
 146 +               ret = 0;
 147 +       }
 148 +       else
 149 +               ret = -EBUSY;
 150 +       mutex_unlock(&goldfish_tty_lock);
 151 +       return ret;
 152 +}
 153 +
 154 +static void goldfish_tty_close(struct tty_struct * tty, struct file * filp)
 155 +{
 156 +       struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
 157 +
 158 +       mutex_lock(&goldfish_tty_lock);
 159 +       if(qtty->tty == tty) {
 160 +               if(--qtty->opencount == 0) {
 161 +                       writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
 162 +                       qtty->tty = NULL;
 163 +               }
 164 +       }
 165 +       mutex_unlock(&goldfish_tty_lock);
 166 +}
 167 +
 168 +static int goldfish_tty_write(struct tty_struct * tty, const unsigned char *buf, int count)
 169 +{
 170 +       goldfish_tty_do_write(tty->index, buf, count);
 171 +       return count;
 172 +}
 173 +
 174 +static int goldfish_tty_write_room(struct tty_struct *tty)
 175 +{
 176 +       return 0x10000;
 177 +}
 178 +
 179 +static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
 180 +{
 181 +       struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
 182 +       uint32_t base = qtty->base;
 183 +       return readl(base + GOLDFISH_TTY_BYTES_READY);
 184 +}
 185 +
 186 +static void goldfish_tty_console_write(struct console *co, const char *b, unsigned count)
 187 +{
 188 +       goldfish_tty_do_write(co->index, b, count);
 189 +}
 190 +
 191 +static struct tty_driver *goldfish_tty_console_device(struct console *c, int *index)
 192 +{
 193 +       *index = c->index;
 194 +       return goldfish_tty_driver;
 195 +}
 196 +
 197 +static int goldfish_tty_console_setup(struct console *co, char *options)
 198 +{
 199 +       if((unsigned)co->index > goldfish_tty_line_count)
 200 +               return -ENODEV;
 201 +       if(goldfish_ttys[co->index].base == 0)
 202 +               return -ENODEV;
 203 +       return 0;
 204 +}
 205 +
 206 +static struct tty_operations goldfish_tty_ops = {
 207 +       .open = goldfish_tty_open,
 208 +       .close = goldfish_tty_close,
 209 +       .write = goldfish_tty_write,
 210 +       .write_room = goldfish_tty_write_room,
 211 +       .chars_in_buffer = goldfish_tty_chars_in_buffer,
 212 +};
 213 +
 214 +static int __devinit goldfish_tty_create_driver(void)
 215 +{
 216 +       int ret;
 217 +       struct tty_driver *tty;
 218 +
 219 +       goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) * goldfish_tty_line_count, GFP_KERNEL);
 220 +       if(goldfish_ttys == NULL) {
 221 +               ret = -ENOMEM;
 222 +               goto err_alloc_goldfish_ttys_failed;
 223 +       }
 224 +
 225 +       tty = alloc_tty_driver(goldfish_tty_line_count);
 226 +       if(tty == NULL) {
 227 +               ret = -ENOMEM;
 228 +               goto err_alloc_tty_driver_failed;
 229 +       }
 230 +       tty->driver_name = "goldfish";
 231 +       tty->name = "ttyS";
 232 +       tty->type = TTY_DRIVER_TYPE_SERIAL;
 233 +       tty->subtype = SERIAL_TYPE_NORMAL;
 234 +       tty->init_termios = tty_std_termios;
 235 +       tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 236 +       tty_set_operations(tty, &goldfish_tty_ops);
 237 +       ret = tty_register_driver(tty);
 238 +       if(ret)
 239 +               goto err_tty_register_driver_failed;
 240 +
 241 +       goldfish_tty_driver = tty;
 242 +       return 0;
 243 +
 244 +err_tty_register_driver_failed:
 245 +       put_tty_driver(tty);
 246 +err_alloc_tty_driver_failed:
 247 +       kfree(goldfish_ttys);
 248 +       goldfish_ttys = NULL;
 249 +err_alloc_goldfish_ttys_failed:
 250 +       return ret;
 251 +}
 252 +
 253 +static void goldfish_tty_delete_driver(void)
 254 +{
 255 +       tty_unregister_driver(goldfish_tty_driver);
 256 +       put_tty_driver(goldfish_tty_driver);
 257 +       goldfish_tty_driver = NULL;
 258 +       kfree(goldfish_ttys);
 259 +       goldfish_ttys = NULL;
 260 +}
 261 +
 262 +static int __devinit goldfish_tty_probe(struct platform_device *pdev)
 263 +{
 264 +       int ret;
 265 +       int i;
 266 +       struct resource *r;
 267 +       struct device *ttydev;
 268 +       uint32_t base;
 269 +       uint32_t irq;
 270 +
 271 +       r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 272 +       if(r == NULL)
 273 +               return -EINVAL;
 274 +       base = IO_ADDRESS(r->start - IO_START);
 275 +       r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 276 +       if(r == NULL)
 277 +               return -EINVAL;
 278 +       irq = r->start;
 279 +
 280 +       if(pdev->id >= goldfish_tty_line_count)
 281 +               return -EINVAL;
 282 +
 283 +       mutex_lock(&goldfish_tty_lock);
 284 +       if(goldfish_tty_current_line_count == 0) {
 285 +               ret = goldfish_tty_create_driver();
 286 +               if(ret)
 287 +                       goto err_create_driver_failed;
 288 +       }
 289 +       goldfish_tty_current_line_count++;
 290 +
 291 +       spin_lock_init(&goldfish_ttys[pdev->id].lock);
 292 +       goldfish_ttys[pdev->id].base = base;
 293 +       goldfish_ttys[pdev->id].irq = irq;
 294 +
 295 +       writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
 296 +
 297 +       ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, "goldfish_tty", pdev);
 298 +       if(ret)
 299 +               goto err_request_irq_failed;
 300 +
 301 +
 302 +       ttydev = tty_register_device(goldfish_tty_driver, pdev->id, NULL);
 303 +       if(IS_ERR(ttydev)) {
 304 +               ret = PTR_ERR(ttydev);
 305 +               goto err_tty_register_device_failed;
 306 +       }
 307 +
 308 +       strcpy(goldfish_ttys[pdev->id].console.name, "ttyS");
 309 +       goldfish_ttys[pdev->id].console.write           = goldfish_tty_console_write;
 310 +       goldfish_ttys[pdev->id].console.device          = goldfish_tty_console_device;
 311 +       goldfish_ttys[pdev->id].console.setup           = goldfish_tty_console_setup;
 312 +       goldfish_ttys[pdev->id].console.flags           = CON_PRINTBUFFER;
 313 +       goldfish_ttys[pdev->id].console.index           = pdev->id;
 314 +       register_console(&goldfish_ttys[pdev->id].console);
 315 +
 316 +
 317 +       mutex_unlock(&goldfish_tty_lock);
 318 +
 319 +       return 0;
 320 +
 321 +       tty_unregister_device(goldfish_tty_driver, i);
 322 +err_tty_register_device_failed:
 323 +       free_irq(irq, pdev);
 324 +err_request_irq_failed:
 325 +       goldfish_tty_current_line_count--;
 326 +       if(goldfish_tty_current_line_count == 0) {
 327 +               goldfish_tty_delete_driver();
 328 +       }
 329 +err_create_driver_failed:
 330 +       mutex_unlock(&goldfish_tty_lock);
 331 +       return ret;
 332 +}
 333 +
 334 +static int __devexit goldfish_tty_remove(struct platform_device *pdev)
 335 +{
 336 +       mutex_lock(&goldfish_tty_lock);
 337 +       unregister_console(&goldfish_ttys[pdev->id].console);
 338 +       tty_unregister_device(goldfish_tty_driver, pdev->id);
 339 +       goldfish_ttys[pdev->id].base = 0;
 340 +       free_irq(goldfish_ttys[pdev->id].irq, pdev);
 341 +       goldfish_tty_current_line_count--;
 342 +       if(goldfish_tty_current_line_count == 0) {
 343 +               goldfish_tty_delete_driver();
 344 +       }
 345 +       mutex_unlock(&goldfish_tty_lock);
 346 +       return 0;
 347 +}
 348 +
 349 +static struct platform_driver goldfish_tty_platform_driver = {
 350 +       .probe = goldfish_tty_probe,
 351 +       .remove = __devexit_p(goldfish_tty_remove),
 352 +       .driver = {
 353 +               .name = "goldfish_tty"
 354 +       }
 355 +};
 356 +
 357 +static int __init goldfish_tty_init(void)
 358 +{
 359 +       return platform_driver_register(&goldfish_tty_platform_driver);
 360 +}
 361 +
 362 +static void __exit goldfish_tty_exit(void)
 363 +{
 364 +       platform_driver_unregister(&goldfish_tty_platform_driver);
 365 +}
 366 +
 367 +module_init(goldfish_tty_init);
 368 +module_exit(goldfish_tty_exit);