de0346065b
Based on a patch by Amaury Pouly which was based on a patch from Ryan Hitchman. I mainly moved the code for polling into the tuner driver so it can be reused by other targets. I added the CONFIG parameter for the polling frequency (in ticks) to save energy. Also, I did some minor cleanups. Change-Id: I95a62e7e1e42c62dbf47ecb27a3b312a42be62aa
240 lines
6.1 KiB
C
240 lines
6.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Bertrik Sikken
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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This is the fmradio_i2c interface, used by the radio driver
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to communicate with the radio tuner chip.
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It is implemented using the generic i2c driver, which does "bit-banged"
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I2C with a couple of GPIO pins.
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*/
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "kernel.h"
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#include "tuner.h"
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#include "generic_i2c.h"
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#include "fmradio_i2c.h"
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#include "thread.h"
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#if defined(SANSA_CLIP) || defined(SANSA_C200V2)
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#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
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#define I2C_SDA_GPIO(x) GPIOB_PIN(x)
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#define I2C_SCL_GPIO_DIR GPIOB_DIR
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#define I2C_SDA_GPIO_DIR GPIOB_DIR
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#define I2C_SCL_PIN 4
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#define I2C_SDA_PIN 5
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#elif defined(SANSA_CLIPV2) || defined(SANSA_CLIPPLUS) \
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|| defined(SANSA_CLIPZIP)
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#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
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#define I2C_SDA_GPIO(x) GPIOB_PIN(x)
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#define I2C_SCL_GPIO_DIR GPIOB_DIR
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#define I2C_SDA_GPIO_DIR GPIOB_DIR
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#define I2C_SCL_PIN 6
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#define I2C_SDA_PIN 7
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#elif defined(SANSA_M200V4)
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#define I2C_SCL_GPIO(x) GPIOD_PIN(x)
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#define I2C_SDA_GPIO(x) GPIOD_PIN(x)
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#define I2C_SCL_GPIO_DIR GPIOD_DIR
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#define I2C_SDA_GPIO_DIR GPIOD_DIR
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#define I2C_SCL_PIN 7
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#define I2C_SDA_PIN 6
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#elif defined(SANSA_FUZE) || defined(SANSA_E200V2)
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#define I2C_SCL_GPIO(x) GPIOA_PIN(x)
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#define I2C_SDA_GPIO(x) GPIOA_PIN(x)
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#define I2C_SCL_GPIO_DIR GPIOA_DIR
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#define I2C_SDA_GPIO_DIR GPIOA_DIR
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#define I2C_SCL_PIN 6
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#define I2C_SDA_PIN 7
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#elif defined(SANSA_FUZEV2)
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#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
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#define I2C_SDA_GPIO(x) GPIOA_PIN(x)
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#define I2C_SCL_GPIO_DIR GPIOB_DIR
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#define I2C_SDA_GPIO_DIR GPIOA_DIR
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#define I2C_SCL_PIN 1
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#define I2C_SDA_PIN 0
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#else
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#error no FM I2C GPIOPIN defines
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#endif
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static int fm_i2c_bus;
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static void fm_scl_dir(bool out)
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{
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if (out) {
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I2C_SCL_GPIO_DIR |= 1 << I2C_SCL_PIN;
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} else {
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I2C_SCL_GPIO_DIR &= ~(1 << I2C_SCL_PIN);
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}
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}
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static void fm_sda_dir(bool out)
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{
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if (out) {
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I2C_SDA_GPIO_DIR |= 1 << I2C_SDA_PIN;
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} else {
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I2C_SDA_GPIO_DIR &= ~(1 << I2C_SDA_PIN);
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}
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}
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static void fm_scl_out(bool level)
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{
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if (level) {
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I2C_SCL_GPIO(I2C_SCL_PIN) = 1 << I2C_SCL_PIN;
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} else {
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I2C_SCL_GPIO(I2C_SCL_PIN) = 0;
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}
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}
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static void fm_sda_out(bool level)
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{
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if (level) {
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I2C_SDA_GPIO(I2C_SDA_PIN) = 1 << I2C_SDA_PIN;
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} else {
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I2C_SDA_GPIO(I2C_SDA_PIN) = 0;
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}
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}
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static bool fm_scl_in(void)
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{
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return I2C_SCL_GPIO(I2C_SCL_PIN);
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}
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static bool fm_sda_in(void)
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{
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return I2C_SDA_GPIO(I2C_SDA_PIN);
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}
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static void fm_delay(int delay)
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{
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if (delay != 0) {
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udelay(delay);
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}
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}
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/* interface towards the generic i2c driver */
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static const struct i2c_interface fm_i2c_interface = {
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.scl_out = fm_scl_out,
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.scl_dir = fm_scl_dir,
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.sda_out = fm_sda_out,
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.sda_dir = fm_sda_dir,
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.sda_in = fm_sda_in,
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.scl_in = fm_scl_in,
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.delay = fm_delay,
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.delay_hd_sta = 1,
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.delay_hd_dat = 0,
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.delay_su_dat = 1,
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.delay_su_sto = 1,
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.delay_su_sta = 1,
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.delay_thigh = 2
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};
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/* initialise i2c for fmradio */
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void fmradio_i2c_init(void)
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{
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fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
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}
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int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
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{
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#ifdef SANSA_FUZEV2
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bitclr32(&CCU_IO, 1<<12);
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#endif
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int ret = i2c_write_data(fm_i2c_bus, address, -1, buf, count);
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#ifdef SANSA_FUZEV2
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bitset32(&CCU_IO, 1<<12);
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#endif
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return ret;
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}
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int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
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{
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#ifdef SANSA_FUZEV2
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bitclr32(&CCU_IO, 1<<12);
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#endif
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int ret = i2c_read_data(fm_i2c_bus, address, -1, buf, count);
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#ifdef SANSA_FUZEV2
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bitset32(&CCU_IO, 1<<12);
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#endif
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return ret;
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}
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#ifdef HAVE_RDS_CAP
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/* On the Sansa Clip Zip, the tuner interrupt line is routed to the SoC so we
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* can use to detect when a RDS packet is ready. On the Clip+, we have to
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* regularly poll. */
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#if !(CONFIG_RDS & RDS_CFG_POLL)
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/* Low-level RDS Support */
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static struct semaphore rds_sema;
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static uint32_t rds_stack[DEFAULT_STACK_SIZE/sizeof(uint32_t)];
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/* RDS GPIO interrupt handler */
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void tuner_isr(void)
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{
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/* read and clear the interrupt */
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if (GPIOA_MIS & (1<<4)) {
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semaphore_release(&rds_sema);
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GPIOA_IC = (1<<4);
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}
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}
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/* Captures RDS data and processes it */
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static void NORETURN_ATTR rds_thread(void)
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{
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while (true) {
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semaphore_wait(&rds_sema, TIMEOUT_BLOCK);
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si4700_rds_process();
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}
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}
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/* Called with on=true after full radio power up, and with on=false before
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powering down */
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void si4700_rds_powerup(bool on)
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{
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GPIOA_IE &= ~(1<<4); /* disable GPIO interrupt */
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if (on) {
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GPIOA_DIR &= ~(1<<4); /* input */
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GPIOA_IS &= ~(1<<4); /* edge detect */
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GPIOA_IBE &= ~(1<<4); /* only one edge */
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GPIOA_IEV &= ~(1<<4); /* falling edge */
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GPIOA_IC = (1<<4); /* clear any pending interrupt */
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GPIOA_IE |= (1<<4); /* enable GPIO interrupt */
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}
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}
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/* One-time RDS init at startup */
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void si4700_rds_init(void)
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{
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semaphore_init(&rds_sema, 1, 0);
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create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
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IF_PRIO(, PRIORITY_REALTIME) IF_COP(, CPU));
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}
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#endif /* !(CONFIG_RDS & RDS_CFG_POLL) */
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#endif /* HAVE_RDS_CAP */
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