diff options
Diffstat (limited to 'drivers/media/pci/cx18/cx18-gpio.c')
| -rw-r--r-- | drivers/media/pci/cx18/cx18-gpio.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-gpio.c b/drivers/media/pci/cx18/cx18-gpio.c new file mode 100644 index 000000000..160c8377e --- /dev/null +++ b/drivers/media/pci/cx18/cx18-gpio.c @@ -0,0 +1,337 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * cx18 gpio functions + * + * Derived from ivtv-gpio.c + * + * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> + * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> + */ + +#include "cx18-driver.h" +#include "cx18-io.h" +#include "cx18-cards.h" +#include "cx18-gpio.h" +#include "xc2028.h" + +/********************* GPIO stuffs *********************/ + +/* GPIO registers */ +#define CX18_REG_GPIO_IN 0xc72010 +#define CX18_REG_GPIO_OUT1 0xc78100 +#define CX18_REG_GPIO_DIR1 0xc78108 +#define CX18_REG_GPIO_OUT2 0xc78104 +#define CX18_REG_GPIO_DIR2 0xc7810c + +/* + * HVR-1600 GPIO pins, courtesy of Hauppauge: + * + * gpio0: zilog ir process reset pin + * gpio1: zilog programming pin (you should never use this) + * gpio12: cx24227 reset pin + * gpio13: cs5345 reset pin +*/ + +/* + * File scope utility functions + */ +static void gpio_write(struct cx18 *cx) +{ + u32 dir_lo = cx->gpio_dir & 0xffff; + u32 val_lo = cx->gpio_val & 0xffff; + u32 dir_hi = cx->gpio_dir >> 16; + u32 val_hi = cx->gpio_val >> 16; + + cx18_write_reg_expect(cx, dir_lo << 16, + CX18_REG_GPIO_DIR1, ~dir_lo, dir_lo); + cx18_write_reg_expect(cx, (dir_lo << 16) | val_lo, + CX18_REG_GPIO_OUT1, val_lo, dir_lo); + cx18_write_reg_expect(cx, dir_hi << 16, + CX18_REG_GPIO_DIR2, ~dir_hi, dir_hi); + cx18_write_reg_expect(cx, (dir_hi << 16) | val_hi, + CX18_REG_GPIO_OUT2, val_hi, dir_hi); +} + +static void gpio_update(struct cx18 *cx, u32 mask, u32 data) +{ + if (mask == 0) + return; + + mutex_lock(&cx->gpio_lock); + cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask); + gpio_write(cx); + mutex_unlock(&cx->gpio_lock); +} + +static void gpio_reset_seq(struct cx18 *cx, u32 active_lo, u32 active_hi, + unsigned int assert_msecs, + unsigned int recovery_msecs) +{ + u32 mask; + + mask = active_lo | active_hi; + if (mask == 0) + return; + + /* + * Assuming that active_hi and active_lo are a subsets of the bits in + * gpio_dir. Also assumes that active_lo and active_hi don't overlap + * in any bit position + */ + + /* Assert */ + gpio_update(cx, mask, ~active_lo); + schedule_timeout_uninterruptible(msecs_to_jiffies(assert_msecs)); + + /* Deassert */ + gpio_update(cx, mask, ~active_hi); + schedule_timeout_uninterruptible(msecs_to_jiffies(recovery_msecs)); +} + +/* + * GPIO Multiplexer - logical device + */ +static int gpiomux_log_status(struct v4l2_subdev *sd) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + + mutex_lock(&cx->gpio_lock); + CX18_INFO_DEV(sd, "GPIO: direction 0x%08x, value 0x%08x\n", + cx->gpio_dir, cx->gpio_val); + mutex_unlock(&cx->gpio_lock); + return 0; +} + +static int gpiomux_s_radio(struct v4l2_subdev *sd) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + + /* + * FIXME - work out the cx->active/audio_input mess - this is + * intended to handle the switch to radio mode and set the + * audio routing, but we need to update the state in cx + */ + gpio_update(cx, cx->card->gpio_audio_input.mask, + cx->card->gpio_audio_input.radio); + return 0; +} + +static int gpiomux_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + u32 data; + + switch (cx->card->audio_inputs[cx->audio_input].muxer_input) { + case 1: + data = cx->card->gpio_audio_input.linein; + break; + case 0: + data = cx->card->gpio_audio_input.tuner; + break; + default: + /* + * FIXME - work out the cx->active/audio_input mess - this is + * intended to handle the switch from radio mode and set the + * audio routing, but we need to update the state in cx + */ + data = cx->card->gpio_audio_input.tuner; + break; + } + gpio_update(cx, cx->card->gpio_audio_input.mask, data); + return 0; +} + +static int gpiomux_s_audio_routing(struct v4l2_subdev *sd, + u32 input, u32 output, u32 config) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + u32 data; + + switch (input) { + case 0: + data = cx->card->gpio_audio_input.tuner; + break; + case 1: + data = cx->card->gpio_audio_input.linein; + break; + case 2: + data = cx->card->gpio_audio_input.radio; + break; + default: + return -EINVAL; + } + gpio_update(cx, cx->card->gpio_audio_input.mask, data); + return 0; +} + +static const struct v4l2_subdev_core_ops gpiomux_core_ops = { + .log_status = gpiomux_log_status, +}; + +static const struct v4l2_subdev_tuner_ops gpiomux_tuner_ops = { + .s_radio = gpiomux_s_radio, +}; + +static const struct v4l2_subdev_audio_ops gpiomux_audio_ops = { + .s_routing = gpiomux_s_audio_routing, +}; + +static const struct v4l2_subdev_video_ops gpiomux_video_ops = { + .s_std = gpiomux_s_std, +}; + +static const struct v4l2_subdev_ops gpiomux_ops = { + .core = &gpiomux_core_ops, + .tuner = &gpiomux_tuner_ops, + .audio = &gpiomux_audio_ops, + .video = &gpiomux_video_ops, +}; + +/* + * GPIO Reset Controller - logical device + */ +static int resetctrl_log_status(struct v4l2_subdev *sd) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + + mutex_lock(&cx->gpio_lock); + CX18_INFO_DEV(sd, "GPIO: direction 0x%08x, value 0x%08x\n", + cx->gpio_dir, cx->gpio_val); + mutex_unlock(&cx->gpio_lock); + return 0; +} + +static int resetctrl_reset(struct v4l2_subdev *sd, u32 val) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + const struct cx18_gpio_i2c_slave_reset *p; + + p = &cx->card->gpio_i2c_slave_reset; + switch (val) { + case CX18_GPIO_RESET_I2C: + gpio_reset_seq(cx, p->active_lo_mask, p->active_hi_mask, + p->msecs_asserted, p->msecs_recovery); + break; + case CX18_GPIO_RESET_Z8F0811: + /* + * Assert timing for the Z8F0811 on HVR-1600 boards: + * 1. Assert RESET for min of 4 clock cycles at 18.432 MHz to + * initiate + * 2. Reset then takes 66 WDT cycles at 10 kHz + 16 xtal clock + * cycles (6,601,085 nanoseconds ~= 7 milliseconds) + * 3. DBG pin must be high before chip exits reset for normal + * operation. DBG is open drain and hopefully pulled high + * since we don't normally drive it (GPIO 1?) for the + * HVR-1600 + * 4. Z8F0811 won't exit reset until RESET is deasserted + * 5. Zilog comes out of reset, loads reset vector address and + * executes from there. Required recovery delay unknown. + */ + gpio_reset_seq(cx, p->ir_reset_mask, 0, + p->msecs_asserted, p->msecs_recovery); + break; + case CX18_GPIO_RESET_XC2028: + if (cx->card->tuners[0].tuner == TUNER_XC2028) + gpio_reset_seq(cx, (1 << cx->card->xceive_pin), 0, + 1, 1); + break; + } + return 0; +} + +static const struct v4l2_subdev_core_ops resetctrl_core_ops = { + .log_status = resetctrl_log_status, + .reset = resetctrl_reset, +}; + +static const struct v4l2_subdev_ops resetctrl_ops = { + .core = &resetctrl_core_ops, +}; + +/* + * External entry points + */ +void cx18_gpio_init(struct cx18 *cx) +{ + mutex_lock(&cx->gpio_lock); + cx->gpio_dir = cx->card->gpio_init.direction; + cx->gpio_val = cx->card->gpio_init.initial_value; + + if (cx->card->tuners[0].tuner == TUNER_XC2028) { + cx->gpio_dir |= 1 << cx->card->xceive_pin; + cx->gpio_val |= 1 << cx->card->xceive_pin; + } + + if (cx->gpio_dir == 0) { + mutex_unlock(&cx->gpio_lock); + return; + } + + CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n", + cx18_read_reg(cx, CX18_REG_GPIO_DIR1), + cx18_read_reg(cx, CX18_REG_GPIO_DIR2), + cx18_read_reg(cx, CX18_REG_GPIO_OUT1), + cx18_read_reg(cx, CX18_REG_GPIO_OUT2)); + + gpio_write(cx); + mutex_unlock(&cx->gpio_lock); +} + +int cx18_gpio_register(struct cx18 *cx, u32 hw) +{ + struct v4l2_subdev *sd; + const struct v4l2_subdev_ops *ops; + char *str; + + switch (hw) { + case CX18_HW_GPIO_MUX: + sd = &cx->sd_gpiomux; + ops = &gpiomux_ops; + str = "gpio-mux"; + break; + case CX18_HW_GPIO_RESET_CTRL: + sd = &cx->sd_resetctrl; + ops = &resetctrl_ops; + str = "gpio-reset-ctrl"; + break; + default: + return -EINVAL; + } + + v4l2_subdev_init(sd, ops); + v4l2_set_subdevdata(sd, cx); + snprintf(sd->name, sizeof(sd->name), "%s %s", cx->v4l2_dev.name, str); + sd->grp_id = hw; + return v4l2_device_register_subdev(&cx->v4l2_dev, sd); +} + +void cx18_reset_ir_gpio(void *data) +{ + struct cx18 *cx = to_cx18((struct v4l2_device *)data); + + if (cx->card->gpio_i2c_slave_reset.ir_reset_mask == 0) + return; + + CX18_DEBUG_INFO("Resetting IR microcontroller\n"); + + v4l2_subdev_call(&cx->sd_resetctrl, + core, reset, CX18_GPIO_RESET_Z8F0811); +} +EXPORT_SYMBOL(cx18_reset_ir_gpio); +/* This symbol is exported for use by lirc_pvr150 for the IR-blaster */ + +/* Xceive tuner reset function */ +int cx18_reset_tuner_gpio(void *dev, int component, int cmd, int value) +{ + struct i2c_algo_bit_data *algo = dev; + struct cx18_i2c_algo_callback_data *cb_data = algo->data; + struct cx18 *cx = cb_data->cx; + + if (cmd != XC2028_TUNER_RESET || + cx->card->tuners[0].tuner != TUNER_XC2028) + return 0; + + CX18_DEBUG_INFO("Resetting XCeive tuner\n"); + return v4l2_subdev_call(&cx->sd_resetctrl, + core, reset, CX18_GPIO_RESET_XC2028); +} |