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Diffstat (limited to 'bsps/arm/tms570/start/pinmux.c')
| -rw-r--r-- | bsps/arm/tms570/start/pinmux.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/bsps/arm/tms570/start/pinmux.c b/bsps/arm/tms570/start/pinmux.c new file mode 100644 index 0000000000..11e557910b --- /dev/null +++ b/bsps/arm/tms570/start/pinmux.c @@ -0,0 +1,195 @@ +/** + * @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; +} |