forked from Imagelibrary/rtems
350 lines
10 KiB
C
350 lines
10 KiB
C
/**
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* @file io.c
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*
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* @ingroup lpc176x
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*
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* @brief Input/output module methods.
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*/
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/*
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* Copyright (c) 2014 Taller Technologies.
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*
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* @author Boretto Martin (martin.boretto@tallertechnologies.com)
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* @author Diaz Marcos (marcos.diaz@tallertechnologies.com)
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* @author Lenarduzzi Federico (federico.lenarduzzi@tallertechnologies.com)
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* @author Daniel Chicco (daniel.chicco@tallertechnologies.com)
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <rtems/status-checks.h>
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#include <bsp.h>
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#include <bsp/io.h>
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#include <bsp/start.h>
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#include <bsp/system-clocks.h>
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/**
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* @brief Modules table according to the LPC176x
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*/
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static const lpc176x_module_entry lpc176x_module_table[] = {
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_WD, 0, 1, 0 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_ADC, 1, 1, 12 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_CAN_0, 1, 1, 13 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_CAN_1, 1, 1, 14 ),
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LPC176X_MODULE_ENTRY(LPC176X_MODULE_ACCF, 0, 1, 15),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_DAC, 0, 1, 11 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_GPDMA, 1, 1, 29 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_GPIO, 0, 1, 15 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_I2S, 1, 1, 27 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_MCI, 1, 1, 28 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_MCPWM, 1, 1, 17 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_PCB, 0, 1, 18 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_PWM_0, 1, 1, 5 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_PWM_1, 1, 1, 6 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_QEI, 1, 1, 18 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_RTC, 1, 1, 9 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_SYSCON, 0, 1, 30 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_TIMER_0, 1, 1, 1 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_TIMER_1, 1, 1, 2 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_TIMER_2, 1, 1, 22 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_TIMER_3, 1, 1, 23 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_UART_0, 1, 1, 3 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_UART_1, 1, 1, 4 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_UART_2, 1, 1, 24 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_UART_3, 1, 1, 25 ),
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LPC176X_MODULE_ENTRY( LPC176X_MODULE_USB, 1, 0, 31 )
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};
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inline void lpc176x_pin_select(
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const uint32_t pin,
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const lpc176x_pin_function function
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)
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{
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assert( pin <= LPC176X_IO_INDEX_MAX
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&& function < LPC176X_PIN_FUNCTION_COUNT );
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const uint32_t pin_selected = LPC176X_PIN_SELECT( pin );
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volatile uint32_t *const pinsel = &LPC176X_PINSEL[ pin_selected ];
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const uint32_t shift = LPC176X_PIN_SELECT_SHIFT( pin );
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*pinsel = SET_FIELD( *pinsel, function,
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LPC176X_PIN_SELECT_MASK << shift, shift );
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}
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void lpc176x_pin_set_mode(
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const uint32_t pin,
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const lpc176x_pin_mode mode
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)
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{
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assert( pin <= LPC176X_IO_INDEX_MAX
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&& mode < LPC176X_PIN_MODE_COUNT );
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const uint32_t pin_selected = LPC176X_PIN_SELECT( pin );
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volatile uint32_t *const pinmode = &LPC176X_PINMODE[ pin_selected ];
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const uint32_t shift = LPC176X_PIN_SELECT_SHIFT( pin );
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*pinmode = SET_FIELD( *pinmode, mode,
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LPC176X_PIN_SELECT_MASK << shift, shift );
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}
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/**
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* @brief Checks if the module has power.
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*
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* @param has_power Power.
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* @param index Index to shift.
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* @param turn_on Turn on/off the power.
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* @param level Interrupts value.
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*/
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static rtems_status_code check_power(
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const bool has_power,
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const unsigned index,
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const bool turn_on,
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rtems_interrupt_level level
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)
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{
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rtems_status_code status_code = RTEMS_INVALID_NUMBER;
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if ( index <= LPC176X_MODULE_BITS_COUNT ) {
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if ( has_power ) {
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rtems_interrupt_disable( level );
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if ( turn_on ) {
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LPC176X_SCB.pconp |= 1u << index;
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} else {
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LPC176X_SCB.pconp &= ~( 1u << index );
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}
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rtems_interrupt_enable( level );
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}
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/* else implies that the module has not power. Also,
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there is nothing to do. */
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status_code = RTEMS_SUCCESSFUL;
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}
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/* else implies an invalid index number. Also, the function
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does not return successful. */
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return status_code;
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}
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/**
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* @brief Sets the correct value according to the specific peripheral clock.
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*
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* @param is_first_pclksel Represents the first pclksel.
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* @param clock The clock to set for this module.
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* @param clock_shift Value to clock shift.
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*/
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static inline void set_pclksel_value(
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const uint32_t pclksel,
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const lpc176x_module_clock clock,
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const unsigned clock_shift
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)
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{
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assert( pclksel < LPC176X_SCB_PCLKSEL_COUNT );
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const uint32_t setclock = ( clock << clock_shift );
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const uint32_t mask = ~( LPC176X_MODULE_CLOCK_MASK << clock_shift );
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LPC176X_SCB.pclksel[ pclksel ] = ( LPC176X_SCB.pclksel[ pclksel ] & mask ) |
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setclock;
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}
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/**
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* @brief Checks if the module has clock.
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*
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* @param has_clock Clock.
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* @param index Index to shift.
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* @param clock The clock to set for this module.
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* @param level Interrupts value.
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*/
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static rtems_status_code check_clock(
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const bool has_clock,
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const unsigned index,
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const lpc176x_module_clock clock,
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rtems_interrupt_level level
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)
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{
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rtems_status_code status_code = RTEMS_INVALID_NUMBER;
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if ( index <= LPC176X_MODULE_BITS_COUNT ) {
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if ( has_clock ) {
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unsigned clock_shift = 2u * index;
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rtems_interrupt_disable( level );
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if ( clock_shift < LPC176X_MODULE_BITS_COUNT ) {
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/* Sets the pclksel 0. */
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set_pclksel_value( LPC176X_SCB_PCLKSEL0, clock, clock_shift );
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} else {
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/* Sets the pclksel 1. */
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clock_shift -= LPC176X_MODULE_BITS_COUNT;
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set_pclksel_value( LPC176X_SCB_PCLKSEL1, clock, clock_shift );
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}
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rtems_interrupt_enable( level );
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}
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/* else implies that the module has not clock. Also,
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there is nothing to do. */
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status_code = RTEMS_SUCCESSFUL;
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}
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/* else implies an invalid index number. Also, the function
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does not return successful. */
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return status_code;
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}
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/**
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* @brief Checks the usb module.
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*
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* @return RTEMS_SUCCESFUL if the usb module is correct.
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*/
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static rtems_status_code check_usb_module( void )
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{
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rtems_status_code status_code = RTEMS_INCORRECT_STATE;
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const uint32_t pllclk = lpc176x_pllclk();
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const uint32_t usbclk = LPC176X_USB_CLOCK;
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if ( pllclk % usbclk == 0u ) {
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const uint32_t usbdiv = pllclk / usbclk;
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LPC176X_SCB.usbclksel = LPC176X_SCB_USBCLKSEL_USBDIV( usbdiv ) |
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LPC176X_SCB_USBCLKSEL_USBSEL( 1 );
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status_code = RTEMS_SUCCESSFUL;
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}
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/* else implies that the module has an incorrect pllclk or usbclk value.
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Also, there is nothing to do. */
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return status_code;
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}
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/**
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* @brief Enables the current module.
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*
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* @param module Current module to enable/disable.
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* @param clock The clock to set for this module.
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* @param enable TRUE if the module is enable.
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* @return RTEMS_SUCCESSFULL if the module was enabled successfully.
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*/
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static rtems_status_code enable_disable_module(
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const lpc176x_module module,
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const lpc176x_module_clock clock,
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const bool enable
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)
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{
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rtems_status_code status_code;
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rtems_interrupt_level level = 0u;
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const bool has_power = lpc176x_module_table[ module ].power;
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const bool has_clock = lpc176x_module_table[ module ].clock;
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const unsigned index = lpc176x_module_table[ module ].index;
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assert( index <= LPC176X_MODULE_BITS_COUNT );
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/* Enable or disable module */
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if ( enable ) {
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status_code = check_power( has_power, index, true, level );
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RTEMS_CHECK_SC( status_code,
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"Checking index shift to turn on power of the module." );
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if ( module != LPC176X_MODULE_USB ) {
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status_code = check_clock( has_clock, index, clock, level );
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RTEMS_CHECK_SC( status_code,
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"Checking index shift to set pclksel to the current module." );
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} else {
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status_code = check_usb_module();
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RTEMS_CHECK_SC( status_code,
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"Checking pll clock to set usb clock to the current module." );
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}
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} else {
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status_code = check_power( has_power, index, false, level );
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RTEMS_CHECK_SC( status_code,
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"Checking index shift to turn off power of the module." );
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}
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return status_code;
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}
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/**
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* @brief Enables the module power and clock.
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*
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* @param module Device to enable.
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* @param clock The clock to set for this module.
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* @param enable Enable or disable the module.
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* @return RTEMS_SUCCESSFULL if the module was enabled succesfully.
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*/
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static rtems_status_code lpc176x_module_do_enable(
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const lpc176x_module module,
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lpc176x_module_clock clock,
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const bool enable
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)
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{
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rtems_status_code status_code = RTEMS_SUCCESSFUL;
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if ( (unsigned) module >= LPC176X_MODULE_COUNT ) {
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return RTEMS_INVALID_ID;
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}
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/* else implies that the module has a correct value. Also,
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there is nothing to do. */
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if ( clock == LPC176X_MODULE_PCLK_DEFAULT ) {
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#if ( LPC176X_PCLKDIV == 1u )
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clock = LPC176X_MODULE_CCLK;
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#elif ( LPC176X_PCLKDIV == 2u )
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clock = LPC176X_MODULE_CCLK_2;
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#elif ( LPC176X_PCLKDIV == 4u )
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clock = LPC176X_MODULE_CCLK_4;
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#elif ( LPC176X_PCLKDIV == 8u )
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clock = LPC176X_MODULE_CCLK_8;
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#else
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#error "Unexpected clock divisor."
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#endif
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}
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/* else implies that the clock has a correct divisor. */
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if ( ( clock & ~LPC176X_MODULE_CLOCK_MASK ) == 0u ) {
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status_code = enable_disable_module( module, clock, enable );
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RTEMS_CHECK_SC( status_code, "Checking the module to enable/disable." );
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} else {
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status_code = RTEMS_INVALID_CLOCK;
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}
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return status_code;
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}
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inline rtems_status_code lpc176x_module_enable(
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const lpc176x_module module,
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lpc176x_module_clock clock
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)
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{
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return lpc176x_module_do_enable( module, clock, true );
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}
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inline rtems_status_code lpc176x_module_disable( const lpc176x_module module )
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{
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return lpc176x_module_do_enable( module,
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LPC176X_MODULE_PCLK_DEFAULT,
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false );
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}
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bool lpc176x_module_is_enabled( const lpc176x_module module )
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{
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assert( (unsigned) module < LPC176X_MODULE_COUNT );
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const bool has_power = lpc176x_module_table[ module ].power;
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bool enabled;
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if ( has_power ) {
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const unsigned index = lpc176x_module_table[ module ].index;
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const uint32_t pconp = LPC176X_SCB.pconp;
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enabled = ( pconp & ( 1u << index ) ) != 0u;
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} else {
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enabled = true;
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}
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return enabled;
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}
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