1f09e8a25c
cx18: Add I2C slave reset via GPIO upon initialization. One user, Michael <msd4824@yahoo.com>, has reported this allows his HVR-1600 EEPROM to be consistently recognized when using (long,) 100 msec delays. The delays in this commit are nominal (10 & 40 msec) and need testing/tuning on boards with I2C problems to find the right values. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/*
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* cx18 gpio functions
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*
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* Derived from ivtv-gpio.c
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#include "cx18-driver.h"
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#include "cx18-cards.h"
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#include "cx18-gpio.h"
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#include "tuner-xc2028.h"
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/********************* GPIO stuffs *********************/
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/* GPIO registers */
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#define CX18_REG_GPIO_IN 0xc72010
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#define CX18_REG_GPIO_OUT1 0xc78100
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#define CX18_REG_GPIO_DIR1 0xc78108
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#define CX18_REG_GPIO_OUT2 0xc78104
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#define CX18_REG_GPIO_DIR2 0xc7810c
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/*
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* HVR-1600 GPIO pins, courtesy of Hauppauge:
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*
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* gpio0: zilog ir process reset pin
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* gpio1: zilog programming pin (you should never use this)
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* gpio12: cx24227 reset pin
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* gpio13: cs5345 reset pin
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*/
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static void gpio_write(struct cx18 *cx)
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{
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u32 dir = cx->gpio_dir;
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u32 val = cx->gpio_val;
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write_reg((dir & 0xffff) << 16, CX18_REG_GPIO_DIR1);
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write_reg(((dir & 0xffff) << 16) | (val & 0xffff),
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CX18_REG_GPIO_OUT1);
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write_reg(dir & 0xffff0000, CX18_REG_GPIO_DIR2);
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write_reg_sync((dir & 0xffff0000) | ((val & 0xffff0000) >> 16),
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CX18_REG_GPIO_OUT2);
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}
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void cx18_reset_i2c_slaves_gpio(struct cx18 *cx)
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{
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const struct cx18_gpio_i2c_slave_reset *p;
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p = &cx->card->gpio_i2c_slave_reset;
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if ((p->active_lo_mask | p->active_hi_mask) == 0)
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return;
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/* Assuming that the masks are a subset of the bits in gpio_dir */
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/* Assert */
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cx->gpio_val =
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(cx->gpio_val | p->active_hi_mask) & ~(p->active_lo_mask);
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gpio_write(cx);
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schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_asserted));
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/* Deassert */
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cx->gpio_val =
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(cx->gpio_val | p->active_lo_mask) & ~(p->active_hi_mask);
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gpio_write(cx);
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schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_recovery));
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}
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void cx18_gpio_init(struct cx18 *cx)
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{
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cx->gpio_dir = cx->card->gpio_init.direction;
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cx->gpio_val = cx->card->gpio_init.initial_value;
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if (cx->card->tuners[0].tuner == TUNER_XC2028) {
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cx->gpio_dir |= 1 << cx->card->xceive_pin;
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cx->gpio_val |= 1 << cx->card->xceive_pin;
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}
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if (cx->gpio_dir == 0)
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return;
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CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n",
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read_reg(CX18_REG_GPIO_DIR1), read_reg(CX18_REG_GPIO_DIR2),
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read_reg(CX18_REG_GPIO_OUT1), read_reg(CX18_REG_GPIO_OUT2));
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gpio_write(cx);
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}
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/* Xceive tuner reset function */
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int cx18_reset_tuner_gpio(void *dev, int cmd, int value)
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{
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struct i2c_algo_bit_data *algo = dev;
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struct cx18_i2c_algo_callback_data *cb_data = algo->data;
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struct cx18 *cx = cb_data->cx;
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if (cmd != XC2028_TUNER_RESET)
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return 0;
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CX18_DEBUG_INFO("Resetting tuner\n");
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cx->gpio_val &= ~(1 << cx->card->xceive_pin);
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gpio_write(cx);
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schedule_timeout_interruptible(msecs_to_jiffies(1));
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cx->gpio_val |= 1 << cx->card->xceive_pin;
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gpio_write(cx);
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schedule_timeout_interruptible(msecs_to_jiffies(1));
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return 0;
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}
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