drivers/media/video/cx18/cx18-gpio.c

   1 /*
   2  *  cx18 gpio functions
   3  *
   4  *  Derived from ivtv-gpio.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *  Copyright (C) 2008  Andy Walls <awalls@radix.net>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22  *  02111-1307  USA
  23  */
  24
  25 #include "cx18-driver.h"
  26 #include "cx18-io.h"
  27 #include "cx18-cards.h"
  28 #include "cx18-gpio.h"
  29 #include "tuner-xc2028.h"
  30
  31 /********************* GPIO stuffs *********************/
  32
  33 /* GPIO registers */
  34 #define CX18_REG_GPIO_IN     0xc72010
  35 #define CX18_REG_GPIO_OUT1   0xc78100
  36 #define CX18_REG_GPIO_DIR1   0xc78108
  37 #define CX18_REG_GPIO_OUT2   0xc78104
  38 #define CX18_REG_GPIO_DIR2   0xc7810c
  39
  40 /*
  41  * HVR-1600 GPIO pins, courtesy of Hauppauge:
  42  *
  43  * gpio0: zilog ir process reset pin
  44  * gpio1: zilog programming pin (you should never use this)
  45  * gpio12: cx24227 reset pin
  46  * gpio13: cs5345 reset pin
  47 */
  48
  49 /*
  50  * File scope utility functions
  51  */
  52 static void gpio_write(struct cx18 *cx)
  53 {
  54         u32 dir_lo = cx->gpio_dir & 0xffff;
  55         u32 val_lo = cx->gpio_val & 0xffff;
  56         u32 dir_hi = cx->gpio_dir >> 16;
  57         u32 val_hi = cx->gpio_val >> 16;
  58
  59         cx18_write_reg_expect(cx, dir_lo << 16,
  60                                         CX18_REG_GPIO_DIR1, ~dir_lo, dir_lo);
  61         cx18_write_reg_expect(cx, (dir_lo << 16) | val_lo,
  62                                         CX18_REG_GPIO_OUT1, val_lo, dir_lo);
  63         cx18_write_reg_expect(cx, dir_hi << 16,
  64                                         CX18_REG_GPIO_DIR2, ~dir_hi, dir_hi);
  65         cx18_write_reg_expect(cx, (dir_hi << 16) | val_hi,
  66                                         CX18_REG_GPIO_OUT2, val_hi, dir_hi);
  67 }
  68
  69 static void gpio_update(struct cx18 *cx, u32 mask, u32 data)
  70 {
  71         if (mask == 0)
  72                 return;
  73
  74         mutex_lock(&cx->gpio_lock);
  75         cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask);
  76         gpio_write(cx);
  77         mutex_unlock(&cx->gpio_lock);
  78 }
  79
  80 static void gpio_reset_seq(struct cx18 *cx, u32 active_lo, u32 active_hi,
  81                            unsigned int assert_msecs,
  82                            unsigned int recovery_msecs)
  83 {
  84         u32 mask;
  85
  86         mask = active_lo | active_hi;
  87         if (mask == 0)
  88                 return;
  89
  90         /*
  91          * Assuming that active_hi and active_lo are a subsets of the bits in
  92          * gpio_dir.  Also assumes that active_lo and active_hi don't overlap
  93          * in any bit position
  94          */
  95
  96         /* Assert */
  97         gpio_update(cx, mask, ~active_lo);
  98         schedule_timeout_uninterruptible(msecs_to_jiffies(assert_msecs));
  99
 100         /* Deassert */
 101         gpio_update(cx, mask, ~active_hi);
 102         schedule_timeout_uninterruptible(msecs_to_jiffies(recovery_msecs));
 103 }
 104
 105 /*
 106  * GPIO Multiplexer - logical device
 107  */
 108 static int gpiomux_log_status(struct v4l2_subdev *sd)
 109 {
 110         struct cx18 *cx = v4l2_get_subdevdata(sd);
 111
 112         mutex_lock(&cx->gpio_lock);
 113         CX18_INFO_DEV(sd, "GPIO:  direction 0x%08x, value 0x%08x\n",
 114                       cx->gpio_dir, cx->gpio_val);
 115         mutex_unlock(&cx->gpio_lock);
 116         return 0;
 117 }
 118
 119 static int gpiomux_s_radio(struct v4l2_subdev *sd)
 120 {
 121         struct cx18 *cx = v4l2_get_subdevdata(sd);
 122
 123         /*
 124          * FIXME - work out the cx->active/audio_input mess - this is
 125          * intended to handle the switch to radio mode and set the
 126          * audio routing, but we need to update the state in cx
 127          */
 128         gpio_update(cx, cx->card->gpio_audio_input.mask,
 129                         cx->card->gpio_audio_input.radio);
 130         return 0;
 131 }
 132
 133 static int gpiomux_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
 134 {
 135         struct cx18 *cx = v4l2_get_subdevdata(sd);
 136         u32 data;
 137
 138         switch (cx->card->audio_inputs[cx->audio_input].muxer_input) {
 139         case 1:
 140                 data = cx->card->gpio_audio_input.linein;
 141                 break;
 142         case 0:
 143                 data = cx->card->gpio_audio_input.tuner;
 144                 break;
 145         default:
 146                 /*
 147                  * FIXME - work out the cx->active/audio_input mess - this is
 148                  * intended to handle the switch from radio mode and set the
 149                  * audio routing, but we need to update the state in cx
 150                  */
 151                 data = cx->card->gpio_audio_input.tuner;
 152                 break;
 153         }
 154         gpio_update(cx, cx->card->gpio_audio_input.mask, data);
 155         return 0;
 156 }
 157
 158 static int gpiomux_s_audio_routing(struct v4l2_subdev *sd,
 159                                    u32 input, u32 output, u32 config)
 160 {
 161         struct cx18 *cx = v4l2_get_subdevdata(sd);
 162         u32 data;
 163
 164         switch (input) {
 165         case 0:
 166                 data = cx->card->gpio_audio_input.tuner;
 167                 break;
 168         case 1:
 169                 data = cx->card->gpio_audio_input.linein;
 170                 break;
 171         case 2:
 172                 data = cx->card->gpio_audio_input.radio;
 173                 break;
 174         default:
 175                 return -EINVAL;
 176         }
 177         gpio_update(cx, cx->card->gpio_audio_input.mask, data);
 178         return 0;
 179 }
 180
 181 static const struct v4l2_subdev_core_ops gpiomux_core_ops = {
 182         .log_status = gpiomux_log_status,
 183         .s_std = gpiomux_s_std,
 184 };
 185
 186 static const struct v4l2_subdev_tuner_ops gpiomux_tuner_ops = {
 187         .s_radio = gpiomux_s_radio,
 188 };
 189
 190 static const struct v4l2_subdev_audio_ops gpiomux_audio_ops = {
 191         .s_routing = gpiomux_s_audio_routing,
 192 };
 193
 194 static const struct v4l2_subdev_ops gpiomux_ops = {
 195         .core = &gpiomux_core_ops,
 196         .tuner = &gpiomux_tuner_ops,
 197         .audio = &gpiomux_audio_ops,
 198 };
 199
 200 /*
 201  * GPIO Reset Controller - logical device
 202  */
 203 static int resetctrl_log_status(struct v4l2_subdev *sd)
 204 {
 205         struct cx18 *cx = v4l2_get_subdevdata(sd);
 206
 207         mutex_lock(&cx->gpio_lock);
 208         CX18_INFO_DEV(sd, "GPIO:  direction 0x%08x, value 0x%08x\n",
 209                       cx->gpio_dir, cx->gpio_val);
 210         mutex_unlock(&cx->gpio_lock);
 211         return 0;
 212 }
 213
 214 static int resetctrl_reset(struct v4l2_subdev *sd, u32 val)
 215 {
 216         struct cx18 *cx = v4l2_get_subdevdata(sd);
 217         const struct cx18_gpio_i2c_slave_reset *p;
 218
 219         p = &cx->card->gpio_i2c_slave_reset;
 220         switch (val) {
 221         case CX18_GPIO_RESET_I2C:
 222                 gpio_reset_seq(cx, p->active_lo_mask, p->active_hi_mask,
 223                                p->msecs_asserted, p->msecs_recovery);
 224                 break;
 225         case CX18_GPIO_RESET_Z8F0811:
 226                 /*
 227                  * Assert timing for the Z8F0811 on HVR-1600 boards:
 228                  * 1. Assert RESET for min of 4 clock cycles at 18.432 MHz to
 229                  *    initiate
 230                  * 2. Reset then takes 66 WDT cycles at 10 kHz + 16 xtal clock
 231                  *    cycles (6,601,085 nanoseconds ~= 7 milliseconds)
 232                  * 3. DBG pin must be high before chip exits reset for normal
 233                  *    operation.  DBG is open drain and hopefully pulled high
 234                  *    since we don't normally drive it (GPIO 1?) for the
 235                  *    HVR-1600
 236                  * 4. Z8F0811 won't exit reset until RESET is deasserted
 237                  * 5. Zilog comes out of reset, loads reset vector address and
 238                  *    executes from there. Required recovery delay unknown.
 239                  */
 240                 gpio_reset_seq(cx, p->ir_reset_mask, 0,
 241                                p->msecs_asserted, p->msecs_recovery);
 242                 break;
 243         case CX18_GPIO_RESET_XC2028:
 244                 if (cx->card->tuners[0].tuner == TUNER_XC2028)
 245                         gpio_reset_seq(cx, (1 << cx->card->xceive_pin), 0,
 246                                        1, 1);
 247                 break;
 248         }
 249         return 0;
 250 }
 251
 252 static const struct v4l2_subdev_core_ops resetctrl_core_ops = {
 253         .log_status = resetctrl_log_status,
 254         .reset = resetctrl_reset,
 255 };
 256
 257 static const struct v4l2_subdev_ops resetctrl_ops = {
 258         .core = &resetctrl_core_ops,
 259 };
 260
 261 /*
 262  * External entry points
 263  */
 264 void cx18_gpio_init(struct cx18 *cx)
 265 {
 266         mutex_lock(&cx->gpio_lock);
 267         cx->gpio_dir = cx->card->gpio_init.direction;
 268         cx->gpio_val = cx->card->gpio_init.initial_value;
 269
 270         if (cx->card->tuners[0].tuner == TUNER_XC2028) {
 271                 cx->gpio_dir |= 1 << cx->card->xceive_pin;
 272                 cx->gpio_val |= 1 << cx->card->xceive_pin;
 273         }
 274
 275         if (cx->gpio_dir == 0) {
 276                 mutex_unlock(&cx->gpio_lock);
 277                 return;
 278         }
 279
 280         CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n",
 281                         cx18_read_reg(cx, CX18_REG_GPIO_DIR1),
 282                         cx18_read_reg(cx, CX18_REG_GPIO_DIR2),
 283                         cx18_read_reg(cx, CX18_REG_GPIO_OUT1),
 284                         cx18_read_reg(cx, CX18_REG_GPIO_OUT2));
 285
 286         gpio_write(cx);
 287         mutex_unlock(&cx->gpio_lock);
 288 }
 289
 290 int cx18_gpio_register(struct cx18 *cx, u32 hw)
 291 {
 292         struct v4l2_subdev *sd;
 293         const struct v4l2_subdev_ops *ops;
 294         char *str;
 295
 296         switch (hw) {
 297         case CX18_HW_GPIO_MUX:
 298                 sd = &cx->sd_gpiomux;
 299                 ops = &gpiomux_ops;
 300                 str = "gpio-mux";
 301                 break;
 302         case CX18_HW_GPIO_RESET_CTRL:
 303                 sd = &cx->sd_resetctrl;
 304                 ops = &resetctrl_ops;
 305                 str = "gpio-reset-ctrl";
 306                 break;
 307         default:
 308                 return -EINVAL;
 309         }
 310
 311         v4l2_subdev_init(sd, ops);
 312         v4l2_set_subdevdata(sd, cx);
 313         snprintf(sd->name, sizeof(sd->name), "%s %s", cx->v4l2_dev.name, str);
 314         sd->grp_id = hw;
 315         return v4l2_device_register_subdev(&cx->v4l2_dev, sd);
 316 }
 317
 318 void cx18_reset_ir_gpio(void *data)
 319 {
 320         struct cx18 *cx = to_cx18((struct v4l2_device *)data);
 321
 322         if (cx->card->gpio_i2c_slave_reset.ir_reset_mask == 0)
 323                 return;
 324
 325         CX18_DEBUG_INFO("Resetting IR microcontroller\n");
 326
 327         v4l2_subdev_call(&cx->sd_resetctrl,
 328                          core, reset, CX18_GPIO_RESET_Z8F0811);
 329 }
 330 EXPORT_SYMBOL(cx18_reset_ir_gpio);
 331 /* This symbol is exported for use by lirc_pvr150 for the IR-blaster */
 332
 333 /* Xceive tuner reset function */
 334 int cx18_reset_tuner_gpio(void *dev, int component, int cmd, int value)
 335 {
 336         struct i2c_algo_bit_data *algo = dev;
 337         struct cx18_i2c_algo_callback_data *cb_data = algo->data;
 338         struct cx18 *cx = cb_data->cx;
 339
 340         if (cmd != XC2028_TUNER_RESET ||
 341             cx->card->tuners[0].tuner != TUNER_XC2028)
 342                 return 0;
 343
 344         CX18_DEBUG_INFO("Resetting XCeive tuner\n");
 345         return v4l2_subdev_call(&cx->sd_resetctrl,
 346                                 core, reset, CX18_GPIO_RESET_XC2028);
 347 }