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/**
* @file pinmux.c
*
* @ingroup tms570
*
* @brief I/O Multiplexing Module (IOMM) basic support
*/
/*
* Copyright (c) 2015 Premysl Houdek <kom541000@gmail.com>
*
* Google Summer of Code 2014 at
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp/tms570.h>
#include <bsp/tms570-pinmux.h>
#include <bsp/irq.h>
uint32_t tms570_bsp_pinmmr_kick_key0 = 0x83E70B13U;
uint32_t tms570_bsp_pinmmr_kick_key1 = 0x95A4F1E0U;
/**
* @brief select desired function of pin/ball
*
* The function setups multiplexer to interconnect pin with
* specified function/peripheral. Pin number is index into pinmux
* entries array. Predefined values for pins are in a format
* TMS570_BALL_ \c column \c row (for example \c TMS570_BALL_N19).
* The multiplexer allows to interconnect one pin to multiple
* signal sources/sinks in the theory but it is usually bad choice.
* The function sets only specified function and clears all other
* connections.
*
* @param[in] pin_num pin/ball identifier (index into pinmux array),
* @param[in] pin_fnc function number 0 .. 7, if value \c TMS570_PIN_FNC_AUTO
* is specified then pin function is extracted from
* pin_num argument
* @retval Void
*/
void
tms570_bsp_pin_set_function(int pin_num, int pin_fnc)
{
unsigned int pin_shift;
volatile uint32_t *pinmmrx;
if ( pin_fnc == TMS570_PIN_FNC_AUTO ) {
pin_fnc = (pin_num & TMS570_PIN_FNC_MASK) >> TMS570_PIN_FNC_SHIFT;
}
tms570_bsp_pin_to_pinmmrx(&pinmmrx, &pin_shift, pin_num);
*pinmmrx = (*pinmmrx & ~(0xff << pin_shift)) | (1 << (pin_fnc + pin_shift));
}
/**
* @brief clear connection between pin and specified peripherals/function
*
* This function switches off given connection and leaves rest
* of multiplexer setup intact.
*
* @param[in] pin_num pin/ball identifier (index into pinmux array)
* @param[in] pin_fnc function number 0 .. 7, if value \c TMS570_PIN_FNC_AUTO
* is specified then pin function is extracted from
* pin_num argument
* @retval Void
*/
void
tms570_bsp_pin_clear_function(int pin_num, int pin_fnc)
{
unsigned int pin_shift;
volatile uint32_t *pinmmrx;
if ( pin_fnc == TMS570_PIN_FNC_AUTO ) {
pin_fnc = (pin_num & TMS570_PIN_FNC_MASK) >> TMS570_PIN_FNC_SHIFT;
}
tms570_bsp_pin_to_pinmmrx(&pinmmrx, &pin_shift, pin_num);
*pinmmrx = *pinmmrx & ~(1 << (pin_fnc+pin_shift));
}
/**
* @brief configure one pin according to its function specification
*
* The function setups multiplexer to interconnect pin with
* specified function/peripheral. Predefined values for pins combined with
* function are in a format TMS570_BALL_ \c column \c row \c function
* (for example \c TMS570_BALL_W3_SCIRX).
* If the function can be connected to more pins then specification
* includes infomation which allows to disconnect alternative pin to peripheral
* input connection or switch input multiplexer to right pin.
*
* @param[in] pin_num_and_fnc pin function descriptor is build by macro
* \c TMS570_PIN_AND_FNC which takes pin/pinmmr specification
* build by \c TMS570_BALL_WITH_MMR and function index in output
* multiplexer. If the peripheral can be connected to other input
* alternative then actual pin description and alternative to
* disconnected/reconnect are combined together by
* \c TMS570_PIN_WITH_IN_ALT macro. If clear of alternative
* connection is required then flag \c TMS570_PIN_CLEAR_RQ_MASK
* is ored to alternative description.
*
* @retval Void
*/
void
tms570_bsp_pin_config_one(uint32_t pin_num_and_fnc)
{
rtems_interrupt_level intlev;
uint32_t pin_in_alt;
rtems_interrupt_disable(intlev);
TMS570_IOMM.KICK_REG0 = tms570_bsp_pinmmr_kick_key0;
TMS570_IOMM.KICK_REG1 = tms570_bsp_pinmmr_kick_key1;
pin_in_alt = pin_num_and_fnc & TMS570_PIN_IN_ALT_MASK;
if ( pin_in_alt ) {
pin_in_alt >>= TMS570_PIN_IN_ALT_SHIFT;
if ( pin_in_alt & TMS570_PIN_CLEAR_RQ_MASK ) {
tms570_bsp_pin_clear_function(pin_in_alt, TMS570_PIN_FNC_AUTO);
} else {
tms570_bsp_pin_set_function(pin_in_alt, TMS570_PIN_FNC_AUTO);
}
}
pin_num_and_fnc &= TMS570_PIN_NUM_FNC_MASK;
if ( pin_num_and_fnc & TMS570_PIN_CLEAR_RQ_MASK ) {
tms570_bsp_pin_clear_function(pin_num_and_fnc, TMS570_PIN_FNC_AUTO);
} else {
tms570_bsp_pin_set_function(pin_num_and_fnc, TMS570_PIN_FNC_AUTO);
}
TMS570_IOMM.KICK_REG0 = 0;
TMS570_IOMM.KICK_REG1 = 0;
rtems_interrupt_enable(intlev);
}
/**
* @brief configure block or whole pin multiplexer
*
* Function change multiplexer content. It is intended for initial
* chip setup and does not use locking. If complete reconfiguration
* is required at runtime then it is application responsibility
* to protect and serialize change with peripherals drivers
* and parallel calls
*
* @param[in] pinmmr_values pointer to array with required multiplexer setup
* @param[in] reg_start starting register, this allows to configure non-consecutive
* registers groups found on some MCU family members
* @param[in] reg_count number of words in initialization array to set
* to corresponding registers
*
* @retval Void
*/
void
tms570_bsp_pinmmr_config(const uint32_t *pinmmr_values, int reg_start, int reg_count)
{
volatile uint32_t *pinmmrx;
const uint32_t *pval;
int cnt;
if ( reg_count <= 0)
return;
TMS570_IOMM.KICK_REG0 = tms570_bsp_pinmmr_kick_key0;
TMS570_IOMM.KICK_REG1 = tms570_bsp_pinmmr_kick_key1;
pinmmrx = (&TMS570_IOMM.PINMUX.PINMMR0) + reg_start;
pval = pinmmr_values;
cnt = reg_count;
do {
*pinmmrx = *pinmmrx & *pval;
pinmmrx++;
pval++;
} while( --cnt );
pinmmrx = (&TMS570_IOMM.PINMUX.PINMMR0) + reg_start;
pval = pinmmr_values;
cnt = reg_count;
do {
*pinmmrx = *pval;
pinmmrx++;
pval++;
} while( --cnt );
TMS570_IOMM.KICK_REG0 = 0;
TMS570_IOMM.KICK_REG1 = 0;
}
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