1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * cx18 gpio functions 4 * 5 * Derived from ivtv-gpio.c 6 * 7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> 8 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> 9 */ 10 11 #include "cx18-driver.h" 12 #include "cx18-io.h" 13 #include "cx18-cards.h" 14 #include "cx18-gpio.h" 15 #include "xc2028.h" 16 17 /********************* GPIO stuffs *********************/ 18 19 /* GPIO registers */ 20 #define CX18_REG_GPIO_IN 0xc72010 21 #define CX18_REG_GPIO_OUT1 0xc78100 22 #define CX18_REG_GPIO_DIR1 0xc78108 23 #define CX18_REG_GPIO_OUT2 0xc78104 24 #define CX18_REG_GPIO_DIR2 0xc7810c 25 26 /* 27 * HVR-1600 GPIO pins, courtesy of Hauppauge: 28 * 29 * gpio0: zilog ir process reset pin 30 * gpio1: zilog programming pin (you should never use this) 31 * gpio12: cx24227 reset pin 32 * gpio13: cs5345 reset pin 33 */ 34 35 /* 36 * File scope utility functions 37 */ 38 static void gpio_write(struct cx18 *cx) 39 { 40 u32 dir_lo = cx->gpio_dir & 0xffff; 41 u32 val_lo = cx->gpio_val & 0xffff; 42 u32 dir_hi = cx->gpio_dir >> 16; 43 u32 val_hi = cx->gpio_val >> 16; 44 45 cx18_write_reg_expect(cx, dir_lo << 16, 46 CX18_REG_GPIO_DIR1, ~dir_lo, dir_lo); 47 cx18_write_reg_expect(cx, (dir_lo << 16) | val_lo, 48 CX18_REG_GPIO_OUT1, val_lo, dir_lo); 49 cx18_write_reg_expect(cx, dir_hi << 16, 50 CX18_REG_GPIO_DIR2, ~dir_hi, dir_hi); 51 cx18_write_reg_expect(cx, (dir_hi << 16) | val_hi, 52 CX18_REG_GPIO_OUT2, val_hi, dir_hi); 53 } 54 55 static void gpio_update(struct cx18 *cx, u32 mask, u32 data) 56 { 57 if (mask == 0) 58 return; 59 60 mutex_lock(&cx->gpio_lock); 61 cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask); 62 gpio_write(cx); 63 mutex_unlock(&cx->gpio_lock); 64 } 65 66 static void gpio_reset_seq(struct cx18 *cx, u32 active_lo, u32 active_hi, 67 unsigned int assert_msecs, 68 unsigned int recovery_msecs) 69 { 70 u32 mask; 71 72 mask = active_lo | active_hi; 73 if (mask == 0) 74 return; 75 76 /* 77 * Assuming that active_hi and active_lo are a subsets of the bits in 78 * gpio_dir. Also assumes that active_lo and active_hi don't overlap 79 * in any bit position 80 */ 81 82 /* Assert */ 83 gpio_update(cx, mask, ~active_lo); 84 schedule_timeout_uninterruptible(msecs_to_jiffies(assert_msecs)); 85 86 /* Deassert */ 87 gpio_update(cx, mask, ~active_hi); 88 schedule_timeout_uninterruptible(msecs_to_jiffies(recovery_msecs)); 89 } 90 91 /* 92 * GPIO Multiplexer - logical device 93 */ 94 static int gpiomux_log_status(struct v4l2_subdev *sd) 95 { 96 struct cx18 *cx = v4l2_get_subdevdata(sd); 97 98 mutex_lock(&cx->gpio_lock); 99 CX18_INFO_DEV(sd, "GPIO: direction 0x%08x, value 0x%08x\n", 100 cx->gpio_dir, cx->gpio_val); 101 mutex_unlock(&cx->gpio_lock); 102 return 0; 103 } 104 105 static int gpiomux_s_radio(struct v4l2_subdev *sd) 106 { 107 struct cx18 *cx = v4l2_get_subdevdata(sd); 108 109 /* 110 * FIXME - work out the cx->active/audio_input mess - this is 111 * intended to handle the switch to radio mode and set the 112 * audio routing, but we need to update the state in cx 113 */ 114 gpio_update(cx, cx->card->gpio_audio_input.mask, 115 cx->card->gpio_audio_input.radio); 116 return 0; 117 } 118 119 static int gpiomux_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) 120 { 121 struct cx18 *cx = v4l2_get_subdevdata(sd); 122 u32 data; 123 124 switch (cx->card->audio_inputs[cx->audio_input].muxer_input) { 125 case 1: 126 data = cx->card->gpio_audio_input.linein; 127 break; 128 case 0: 129 data = cx->card->gpio_audio_input.tuner; 130 break; 131 default: 132 /* 133 * FIXME - work out the cx->active/audio_input mess - this is 134 * intended to handle the switch from radio mode and set the 135 * audio routing, but we need to update the state in cx 136 */ 137 data = cx->card->gpio_audio_input.tuner; 138 break; 139 } 140 gpio_update(cx, cx->card->gpio_audio_input.mask, data); 141 return 0; 142 } 143 144 static int gpiomux_s_audio_routing(struct v4l2_subdev *sd, 145 u32 input, u32 output, u32 config) 146 { 147 struct cx18 *cx = v4l2_get_subdevdata(sd); 148 u32 data; 149 150 switch (input) { 151 case 0: 152 data = cx->card->gpio_audio_input.tuner; 153 break; 154 case 1: 155 data = cx->card->gpio_audio_input.linein; 156 break; 157 case 2: 158 data = cx->card->gpio_audio_input.radio; 159 break; 160 default: 161 return -EINVAL; 162 } 163 gpio_update(cx, cx->card->gpio_audio_input.mask, data); 164 return 0; 165 } 166 167 static const struct v4l2_subdev_core_ops gpiomux_core_ops = { 168 .log_status = gpiomux_log_status, 169 }; 170 171 static const struct v4l2_subdev_tuner_ops gpiomux_tuner_ops = { 172 .s_radio = gpiomux_s_radio, 173 }; 174 175 static const struct v4l2_subdev_audio_ops gpiomux_audio_ops = { 176 .s_routing = gpiomux_s_audio_routing, 177 }; 178 179 static const struct v4l2_subdev_video_ops gpiomux_video_ops = { 180 .s_std = gpiomux_s_std, 181 }; 182 183 static const struct v4l2_subdev_ops gpiomux_ops = { 184 .core = &gpiomux_core_ops, 185 .tuner = &gpiomux_tuner_ops, 186 .audio = &gpiomux_audio_ops, 187 .video = &gpiomux_video_ops, 188 }; 189 190 /* 191 * GPIO Reset Controller - logical device 192 */ 193 static int resetctrl_log_status(struct v4l2_subdev *sd) 194 { 195 struct cx18 *cx = v4l2_get_subdevdata(sd); 196 197 mutex_lock(&cx->gpio_lock); 198 CX18_INFO_DEV(sd, "GPIO: direction 0x%08x, value 0x%08x\n", 199 cx->gpio_dir, cx->gpio_val); 200 mutex_unlock(&cx->gpio_lock); 201 return 0; 202 } 203 204 static int resetctrl_reset(struct v4l2_subdev *sd, u32 val) 205 { 206 struct cx18 *cx = v4l2_get_subdevdata(sd); 207 const struct cx18_gpio_i2c_slave_reset *p; 208 209 p = &cx->card->gpio_i2c_slave_reset; 210 switch (val) { 211 case CX18_GPIO_RESET_I2C: 212 gpio_reset_seq(cx, p->active_lo_mask, p->active_hi_mask, 213 p->msecs_asserted, p->msecs_recovery); 214 break; 215 case CX18_GPIO_RESET_Z8F0811: 216 /* 217 * Assert timing for the Z8F0811 on HVR-1600 boards: 218 * 1. Assert RESET for min of 4 clock cycles at 18.432 MHz to 219 * initiate 220 * 2. Reset then takes 66 WDT cycles at 10 kHz + 16 xtal clock 221 * cycles (6,601,085 nanoseconds ~= 7 milliseconds) 222 * 3. DBG pin must be high before chip exits reset for normal 223 * operation. DBG is open drain and hopefully pulled high 224 * since we don't normally drive it (GPIO 1?) for the 225 * HVR-1600 226 * 4. Z8F0811 won't exit reset until RESET is deasserted 227 * 5. Zilog comes out of reset, loads reset vector address and 228 * executes from there. Required recovery delay unknown. 229 */ 230 gpio_reset_seq(cx, p->ir_reset_mask, 0, 231 p->msecs_asserted, p->msecs_recovery); 232 break; 233 case CX18_GPIO_RESET_XC2028: 234 if (cx->card->tuners[0].tuner == TUNER_XC2028) 235 gpio_reset_seq(cx, (1 << cx->card->xceive_pin), 0, 236 1, 1); 237 break; 238 } 239 return 0; 240 } 241 242 static const struct v4l2_subdev_core_ops resetctrl_core_ops = { 243 .log_status = resetctrl_log_status, 244 .reset = resetctrl_reset, 245 }; 246 247 static const struct v4l2_subdev_ops resetctrl_ops = { 248 .core = &resetctrl_core_ops, 249 }; 250 251 /* 252 * External entry points 253 */ 254 void cx18_gpio_init(struct cx18 *cx) 255 { 256 mutex_lock(&cx->gpio_lock); 257 cx->gpio_dir = cx->card->gpio_init.direction; 258 cx->gpio_val = cx->card->gpio_init.initial_value; 259 260 if (cx->card->tuners[0].tuner == TUNER_XC2028) { 261 cx->gpio_dir |= 1 << cx->card->xceive_pin; 262 cx->gpio_val |= 1 << cx->card->xceive_pin; 263 } 264 265 if (cx->gpio_dir == 0) { 266 mutex_unlock(&cx->gpio_lock); 267 return; 268 } 269 270 CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n", 271 cx18_read_reg(cx, CX18_REG_GPIO_DIR1), 272 cx18_read_reg(cx, CX18_REG_GPIO_DIR2), 273 cx18_read_reg(cx, CX18_REG_GPIO_OUT1), 274 cx18_read_reg(cx, CX18_REG_GPIO_OUT2)); 275 276 gpio_write(cx); 277 mutex_unlock(&cx->gpio_lock); 278 } 279 280 int cx18_gpio_register(struct cx18 *cx, u32 hw) 281 { 282 struct v4l2_subdev *sd; 283 const struct v4l2_subdev_ops *ops; 284 char *str; 285 286 switch (hw) { 287 case CX18_HW_GPIO_MUX: 288 sd = &cx->sd_gpiomux; 289 ops = &gpiomux_ops; 290 str = "gpio-mux"; 291 break; 292 case CX18_HW_GPIO_RESET_CTRL: 293 sd = &cx->sd_resetctrl; 294 ops = &resetctrl_ops; 295 str = "gpio-reset-ctrl"; 296 break; 297 default: 298 return -EINVAL; 299 } 300 301 v4l2_subdev_init(sd, ops); 302 v4l2_set_subdevdata(sd, cx); 303 snprintf(sd->name, sizeof(sd->name), "%s %s", cx->v4l2_dev.name, str); 304 sd->grp_id = hw; 305 return v4l2_device_register_subdev(&cx->v4l2_dev, sd); 306 } 307 308 void cx18_reset_ir_gpio(void *data) 309 { 310 struct cx18 *cx = to_cx18((struct v4l2_device *)data); 311 312 if (cx->card->gpio_i2c_slave_reset.ir_reset_mask == 0) 313 return; 314 315 CX18_DEBUG_INFO("Resetting IR microcontroller\n"); 316 317 v4l2_subdev_call(&cx->sd_resetctrl, 318 core, reset, CX18_GPIO_RESET_Z8F0811); 319 } 320 EXPORT_SYMBOL(cx18_reset_ir_gpio); 321 /* This symbol is exported for use by lirc_pvr150 for the IR-blaster */ 322 323 /* Xceive tuner reset function */ 324 int cx18_reset_tuner_gpio(void *dev, int component, int cmd, int value) 325 { 326 struct i2c_algo_bit_data *algo = dev; 327 struct cx18_i2c_algo_callback_data *cb_data = algo->data; 328 struct cx18 *cx = cb_data->cx; 329 330 if (cmd != XC2028_TUNER_RESET || 331 cx->card->tuners[0].tuner != TUNER_XC2028) 332 return 0; 333 334 CX18_DEBUG_INFO("Resetting XCeive tuner\n"); 335 return v4l2_subdev_call(&cx->sd_resetctrl, 336 core, reset, CX18_GPIO_RESET_XC2028); 337 } 338