subsys/bluetooth/controller/hal/nrf5/radio.c

/*
 * Copyright (c) 2016 Nordic Semiconductor ASA
 * Copyright (c) 2016 Vinayak Kariappa Chettimada
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include <soc.h>
#include <arch/arm/cortex_m/cmsis.h>

#include "util.h"
#include "mem.h"
#include "pdu.h"
#include "ccm.h"
#include "radio.h"

#if defined(CONFIG_SOC_SERIES_NRF51X)
#define RADIO_PDU_LEN_MAX (BIT(5) - 1)
#elif defined(CONFIG_SOC_SERIES_NRF52X)
#define RADIO_PDU_LEN_MAX (BIT(8) - 1)
#else
#error "Platform not defined."
#endif

static radio_isr_fp sfp_radio_isr;

void isr_radio(void)
{
	if (sfp_radio_isr) {
		sfp_radio_isr();
	}
}

void radio_isr_set(radio_isr_fp fp_radio_isr)
{
	sfp_radio_isr = fp_radio_isr;	/* atomic assignment of 32-bit word */

	NRF_RADIO->INTENSET = (0 |
				/* RADIO_INTENSET_READY_Msk |
				 * RADIO_INTENSET_ADDRESS_Msk |
				 * RADIO_INTENSET_PAYLOAD_Msk |
				 * RADIO_INTENSET_END_Msk |
				 */
				RADIO_INTENSET_DISABLED_Msk
				/* | RADIO_INTENSET_RSSIEND_Msk |
				 */
	    );

	NVIC_ClearPendingIRQ(RADIO_IRQn);
	irq_enable(RADIO_IRQn);
}

void radio_reset(void)
{
	irq_disable(RADIO_IRQn);

	NRF_RADIO->POWER =
	    ((RADIO_POWER_POWER_Disabled << RADIO_POWER_POWER_Pos) &
	     RADIO_POWER_POWER_Msk);
	NRF_RADIO->POWER =
	    ((RADIO_POWER_POWER_Enabled << RADIO_POWER_POWER_Pos) &
	     RADIO_POWER_POWER_Msk);
}

void radio_phy_set(uint8_t phy)
{
	NRF_RADIO->MODE =
	    (((phy) ? (uint32_t)phy : RADIO_MODE_MODE_Ble_1Mbit) <<
	     RADIO_MODE_MODE_Pos) & RADIO_MODE_MODE_Msk;
}

void radio_tx_power_set(uint32_t power)
{
	/* TODO map power to h/w values. */
	NRF_RADIO->TXPOWER = power;
}

void radio_freq_chnl_set(uint32_t chnl)
{
	NRF_RADIO->FREQUENCY = chnl;
}

void radio_whiten_iv_set(uint32_t iv)
{
	NRF_RADIO->DATAWHITEIV = iv;
}

void radio_aa_set(uint8_t *aa)
{
	NRF_RADIO->TXADDRESS =
	    (((0UL) << RADIO_TXADDRESS_TXADDRESS_Pos) &
	     RADIO_TXADDRESS_TXADDRESS_Msk);
	NRF_RADIO->RXADDRESSES =
	    ((RADIO_RXADDRESSES_ADDR0_Enabled) << RADIO_RXADDRESSES_ADDR0_Pos);
	NRF_RADIO->PREFIX0 = aa[3];
	NRF_RADIO->BASE0 = (aa[2] << 24) | (aa[1] << 16) | (aa[0] << 8);
}

void radio_pkt_configure(uint8_t preamble16, uint8_t bits_len, uint8_t max_len)
{
#if defined(CONFIG_SOC_SERIES_NRF51X)
	ARG_UNUSED(preamble16);

	if (bits_len == 8) {
		bits_len = 5;
	}
#endif

	NRF_RADIO->PCNF0 = ((((1UL) << RADIO_PCNF0_S0LEN_Pos) &
			     RADIO_PCNF0_S0LEN_Msk) |
			     ((((uint32_t)bits_len) << RADIO_PCNF0_LFLEN_Pos) &
			       RADIO_PCNF0_LFLEN_Msk) |
#if !defined(CONFIG_SOC_SERIES_NRF51X)
			     (((RADIO_PCNF0_S1INCL_Include) <<
			       RADIO_PCNF0_S1INCL_Pos) &
			       RADIO_PCNF0_S1INCL_Msk) |
			     ((((preamble16) ? RADIO_PCNF0_PLEN_16bit :
			       RADIO_PCNF0_PLEN_8bit) << RADIO_PCNF0_PLEN_Pos) &
			       RADIO_PCNF0_PLEN_Msk) |
#endif
			     ((((uint32_t)8-bits_len) <<
			       RADIO_PCNF0_S1LEN_Pos) &
			       RADIO_PCNF0_S1LEN_Msk));

	NRF_RADIO->PCNF1 = (((((uint32_t)max_len) << RADIO_PCNF1_MAXLEN_Pos) &
			     RADIO_PCNF1_MAXLEN_Msk) |
			     (((0UL) << RADIO_PCNF1_STATLEN_Pos) &
			       RADIO_PCNF1_STATLEN_Msk) |
			     (((3UL) << RADIO_PCNF1_BALEN_Pos) &
			       RADIO_PCNF1_BALEN_Msk) |
			     (((RADIO_PCNF1_ENDIAN_Little) <<
			       RADIO_PCNF1_ENDIAN_Pos) &
			      RADIO_PCNF1_ENDIAN_Msk) |
			     (((1UL) << RADIO_PCNF1_WHITEEN_Pos) &
			       RADIO_PCNF1_WHITEEN_Msk));
}

void radio_pkt_rx_set(void *rx_packet)
{
	NRF_RADIO->PACKETPTR = (uint32_t)rx_packet;
}

void radio_pkt_tx_set(void *tx_packet)
{
	NRF_RADIO->PACKETPTR = (uint32_t)tx_packet;
}

void radio_rx_enable(void)
{
	NRF_RADIO->TASKS_RXEN = 1;
}

void radio_tx_enable(void)
{
	NRF_RADIO->TASKS_TXEN = 1;
}

void radio_disable(void)
{
	NRF_RADIO->SHORTS = 0;
	NRF_RADIO->TASKS_DISABLE = 1;
}

void radio_status_reset(void)
{
	NRF_RADIO->EVENTS_READY = 0;
	NRF_RADIO->EVENTS_ADDRESS = 0;
	NRF_RADIO->EVENTS_PAYLOAD = 0;
	NRF_RADIO->EVENTS_END = 0;
	NRF_RADIO->EVENTS_DISABLED = 0;
}

uint32_t radio_is_ready(void)
{
	return NRF_RADIO->EVENTS_READY;
}

uint32_t radio_is_done(void)
{
	return NRF_RADIO->EVENTS_END;
}

uint32_t radio_has_disabled(void)
{
	return NRF_RADIO->EVENTS_DISABLED;
}

uint32_t radio_is_idle(void)
{
	return (NRF_RADIO->STATE == 0);
}

void radio_crc_configure(uint32_t polynomial, uint32_t iv)
{
	NRF_RADIO->CRCCNF =
	    (((RADIO_CRCCNF_SKIPADDR_Skip) << RADIO_CRCCNF_SKIPADDR_Pos) &
	     RADIO_CRCCNF_SKIPADDR_Msk) |
	    (((RADIO_CRCCNF_LEN_Three) << RADIO_CRCCNF_LEN_Pos) &
	       RADIO_CRCCNF_LEN_Msk);
	NRF_RADIO->CRCPOLY = polynomial;
	NRF_RADIO->CRCINIT = iv;
}

uint32_t radio_crc_is_valid(void)
{
	return NRF_RADIO->CRCSTATUS;
}

static uint8_t MALIGN(4) _pkt_empty[RADIO_EMPDU_SIZE_MAX];
static uint8_t MALIGN(4) _pkt_scratch[
			((RADIO_PDU_LEN_MAX + 3) > RADIO_ACPDU_SIZE_MAX) ?
			(RADIO_PDU_LEN_MAX + 3) : RADIO_ACPDU_SIZE_MAX];

void *radio_pkt_empty_get(void)
{
	return _pkt_empty;
}

void *radio_pkt_scratch_get(void)
{
	return _pkt_scratch;
}

void radio_switch_complete_and_rx(void)
{
	NRF_RADIO->SHORTS =
	    (RADIO_SHORTS_READY_START_Msk | RADIO_SHORTS_END_DISABLE_Msk |
	     RADIO_SHORTS_DISABLED_RXEN_Msk);
}

void radio_switch_complete_and_tx(void)
{
	NRF_RADIO->SHORTS =
	    (RADIO_SHORTS_READY_START_Msk | RADIO_SHORTS_END_DISABLE_Msk |
	     RADIO_SHORTS_DISABLED_TXEN_Msk);
}

void radio_switch_complete_and_disable(void)
{
	NRF_RADIO->SHORTS =
	    (RADIO_SHORTS_READY_START_Msk | RADIO_SHORTS_END_DISABLE_Msk);
}

void radio_rssi_measure(void)
{
	NRF_RADIO->SHORTS |=
	    (RADIO_SHORTS_ADDRESS_RSSISTART_Msk |
	     RADIO_SHORTS_DISABLED_RSSISTOP_Msk);
}

uint32_t radio_rssi_get(void)
{
	return NRF_RADIO->RSSISAMPLE;
}

void radio_rssi_status_reset(void)
{
	NRF_RADIO->EVENTS_RSSIEND = 0;
}

uint32_t radio_rssi_is_ready(void)
{
	return NRF_RADIO->EVENTS_RSSIEND;
}

void radio_filter_configure(uint8_t bitmask_enable,
				uint8_t bitmask_addr_type,
				uint8_t *bdaddr)
{
	uint8_t index;

	for (index = 0; index < 8; index++) {
		NRF_RADIO->DAB[index] = ((uint32_t)bdaddr[3] << 24) |
			((uint32_t)bdaddr[2] << 16) |
			((uint32_t)bdaddr[1] << 8) |
			bdaddr[0];
		NRF_RADIO->DAP[index] = ((uint32_t)bdaddr[5] << 8) | bdaddr[4];
		bdaddr += BDADDR_SIZE;
	}

	NRF_RADIO->DACNF = ((uint32_t)bitmask_addr_type << 8) | bitmask_enable;
}

void radio_filter_disable(void)
{
	NRF_RADIO->DACNF &= ~(0x000000FF);
}

void radio_filter_status_reset(void)
{
	NRF_RADIO->EVENTS_DEVMATCH = 0;
	NRF_RADIO->EVENTS_DEVMISS = 0;
}

uint32_t radio_filter_has_match(void)
{
	return NRF_RADIO->EVENTS_DEVMATCH;
}

void radio_bc_configure(uint32_t n)
{
	NRF_RADIO->BCC = n;
	NRF_RADIO->SHORTS |= RADIO_SHORTS_ADDRESS_BCSTART_Msk;
}

void radio_bc_status_reset(void)
{
	NRF_RADIO->EVENTS_BCMATCH = 0;
}

uint32_t radio_bc_has_match(void)
{
	return NRF_RADIO->EVENTS_BCMATCH;
}

void radio_tmr_status_reset(void)
{
	NRF_RTC0->EVTENCLR = RTC_EVTENCLR_COMPARE2_Msk;
	NRF_PPI->CHENCLR =
	    (PPI_CHEN_CH0_Msk | PPI_CHEN_CH1_Msk | PPI_CHEN_CH2_Msk |
	     PPI_CHEN_CH3_Msk | PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk |
	     PPI_CHEN_CH6_Msk | PPI_CHEN_CH7_Msk);
}

void radio_tmr_tifs_set(uint32_t tifs)
{
	NRF_RADIO->TIFS = tifs;
}

uint32_t radio_tmr_start(uint8_t trx, uint32_t ticks_start, uint32_t remainder)
{
	if ((!(remainder / 1000000UL)) || (remainder & 0x80000000)) {
		ticks_start--;
		remainder += 30517578UL;
	}
	remainder /= 1000000UL;

	NRF_TIMER0->TASKS_CLEAR = 1;
	NRF_TIMER0->MODE = 0;
	NRF_TIMER0->PRESCALER = 4;
	NRF_TIMER0->BITMODE = 2;	/* 24 - bit */

	NRF_TIMER0->CC[0] = remainder;
	NRF_TIMER0->EVENTS_COMPARE[0] = 0;

	NRF_RTC0->CC[2] = ticks_start;
	NRF_RTC0->EVTENSET = RTC_EVTENSET_COMPARE2_Msk;
	NRF_RTC0->EVENTS_COMPARE[2] = 0;

	NRF_PPI->CH[1].EEP = (uint32_t)&(NRF_RTC0->EVENTS_COMPARE[2]);
	NRF_PPI->CH[1].TEP = (uint32_t)&(NRF_TIMER0->TASKS_START);
	NRF_PPI->CHENSET = PPI_CHEN_CH1_Msk;

	if (trx) {
		NRF_PPI->CH[0].EEP =
			(uint32_t)&(NRF_TIMER0->EVENTS_COMPARE[0]);
		NRF_PPI->CH[0].TEP =
			(uint32_t)&(NRF_RADIO->TASKS_TXEN);
		NRF_PPI->CHENSET = PPI_CHEN_CH0_Msk;
	} else {
		NRF_PPI->CH[0].EEP =
			(uint32_t)&(NRF_TIMER0->EVENTS_COMPARE[0]);
		NRF_PPI->CH[0].TEP =
			(uint32_t)&(NRF_RADIO->TASKS_RXEN);
		NRF_PPI->CHENSET = PPI_CHEN_CH0_Msk;
	}

	return remainder;
}

void radio_tmr_stop(void)
{
	NRF_TIMER0->TASKS_STOP = 1;
	NRF_TIMER0->TASKS_SHUTDOWN = 1;
}

void radio_tmr_hcto_configure(uint32_t hcto)
{
	NRF_TIMER0->CC[2] = hcto;
	NRF_TIMER0->EVENTS_COMPARE[2] = 0;

	NRF_PPI->CH[4].EEP = (uint32_t)&(NRF_RADIO->EVENTS_ADDRESS);
	NRF_PPI->CH[4].TEP = (uint32_t)&(NRF_TIMER0->TASKS_CAPTURE[2]);
	NRF_PPI->CH[5].EEP = (uint32_t)&(NRF_TIMER0->EVENTS_COMPARE[2]);
	NRF_PPI->CH[5].TEP = (uint32_t)&(NRF_RADIO->TASKS_DISABLE);
	NRF_PPI->CHENSET = (PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk);
}

void radio_tmr_aa_capture(void)
{
	NRF_PPI->CH[2].EEP = (uint32_t)&(NRF_RADIO->EVENTS_READY);
	NRF_PPI->CH[2].TEP = (uint32_t)&(NRF_TIMER0->TASKS_CAPTURE[0]);
	NRF_PPI->CH[3].EEP = (uint32_t)&(NRF_RADIO->EVENTS_ADDRESS);
	NRF_PPI->CH[3].TEP = (uint32_t)&(NRF_TIMER0->TASKS_CAPTURE[1]);
	NRF_PPI->CHENSET = (PPI_CHEN_CH2_Msk | PPI_CHEN_CH3_Msk);
}

uint32_t radio_tmr_aa_get(void)
{
	return (NRF_TIMER0->CC[1] - NRF_TIMER0->CC[0]);
}

void radio_tmr_end_capture(void)
{
	NRF_PPI->CH[7].EEP = (uint32_t)&(NRF_RADIO->EVENTS_END);
	NRF_PPI->CH[7].TEP = (uint32_t)&(NRF_TIMER0->TASKS_CAPTURE[2]);
	NRF_PPI->CHENSET = PPI_CHEN_CH7_Msk;
}

uint32_t radio_tmr_end_get(void)
{
	return NRF_TIMER0->CC[2];
}

void radio_tmr_sample(void)
{
	NRF_TIMER0->TASKS_CAPTURE[3] = 1;
}

uint32_t radio_tmr_sample_get(void)
{
	return NRF_TIMER0->CC[3];
}

static uint8_t MALIGN(4) _ccm_scratch[(RADIO_PDU_LEN_MAX - 4) + 16];

void *radio_ccm_rx_pkt_set(struct ccm *ccm, void *pkt)
{
	NRF_CCM->ENABLE = CCM_ENABLE_ENABLE_Disabled;
	NRF_CCM->ENABLE = CCM_ENABLE_ENABLE_Enabled;
	NRF_CCM->MODE =
#if !defined(CONFIG_SOC_SERIES_NRF51X)
	    ((CCM_MODE_LENGTH_Extended << CCM_MODE_LENGTH_Pos) &
	       CCM_MODE_LENGTH_Msk) |
#endif
	    ((CCM_MODE_MODE_Decryption << CCM_MODE_MODE_Pos) &
	     CCM_MODE_MODE_Msk);
	NRF_CCM->CNFPTR = (uint32_t)ccm;
	NRF_CCM->INPTR = (uint32_t)_pkt_scratch;
	NRF_CCM->OUTPTR = (uint32_t)pkt;
	NRF_CCM->SCRATCHPTR = (uint32_t)_ccm_scratch;
	NRF_CCM->SHORTS = 0;
	NRF_CCM->EVENTS_ENDKSGEN = 0;
	NRF_CCM->EVENTS_ENDCRYPT = 0;
	NRF_CCM->EVENTS_ERROR = 0;

	NRF_PPI->CH[6].EEP = (uint32_t)&(NRF_RADIO->EVENTS_ADDRESS);
	NRF_PPI->CH[6].TEP = (uint32_t)&(NRF_CCM->TASKS_CRYPT);
	NRF_PPI->CHENSET = PPI_CHEN_CH6_Msk;

	NRF_CCM->TASKS_KSGEN = 1;

	return _pkt_scratch;
}

void *radio_ccm_tx_pkt_set(struct ccm *ccm, void *pkt)
{
	NRF_CCM->ENABLE = CCM_ENABLE_ENABLE_Disabled;
	NRF_CCM->ENABLE = CCM_ENABLE_ENABLE_Enabled;
	NRF_CCM->MODE =
#if !defined(CONFIG_SOC_SERIES_NRF51X)
	    ((CCM_MODE_LENGTH_Extended << CCM_MODE_LENGTH_Pos) &
	       CCM_MODE_LENGTH_Msk) |
#endif
	    ((CCM_MODE_MODE_Encryption << CCM_MODE_MODE_Pos) &
	     CCM_MODE_MODE_Msk);
	NRF_CCM->CNFPTR = (uint32_t)ccm;
	NRF_CCM->INPTR = (uint32_t)pkt;
	NRF_CCM->OUTPTR = (uint32_t)_pkt_scratch;
	NRF_CCM->SCRATCHPTR = (uint32_t)_ccm_scratch;
	NRF_CCM->SHORTS = CCM_SHORTS_ENDKSGEN_CRYPT_Msk;
	NRF_CCM->EVENTS_ENDKSGEN = 0;
	NRF_CCM->EVENTS_ENDCRYPT = 0;
	NRF_CCM->EVENTS_ERROR = 0;

#if defined(CONFIG_SOC_SERIES_NRF51X)
	/* set up PPI to enable CCM */
	NRF_PPI->CH[6].EEP = (uint32_t)&(NRF_RADIO->EVENTS_READY);
	NRF_PPI->CH[6].TEP = (uint32_t)&(NRF_CCM->TASKS_KSGEN);
	NRF_PPI->CHENSET = PPI_CHEN_CH6_Msk;
#elif 0
	/* encrypt tx packet */
	NRF_CCM->INTENSET = CCM_INTENSET_ENDCRYPT_Msk;
	NRF_CCM->TASKS_KSGEN = 1;
	while (NRF_CCM->EVENTS_ENDCRYPT == 0) {
		__WFE();
		__SEV();
		__WFE();
	}
	NRF_CCM->INTENCLR = CCM_INTENCLR_ENDCRYPT_Msk;
	NVIC_ClearPendingIRQ(CCM_AAR_IRQn);

	LL_ASSERT(NRF_CCM->EVENTS_ERROR == 0);
#else
	/* start KSGEN early, but dont wait for ENDCRYPT */
	NRF_CCM->TASKS_KSGEN = 1;
#endif

	return _pkt_scratch;
}

uint32_t radio_ccm_is_done(void)
{
	NRF_CCM->INTENSET = CCM_INTENSET_ENDCRYPT_Msk;
	while (NRF_CCM->EVENTS_ENDCRYPT == 0) {
		__WFE();
		__SEV();
		__WFE();
	}
	NRF_CCM->INTENCLR = CCM_INTENCLR_ENDCRYPT_Msk;
	NVIC_ClearPendingIRQ(CCM_AAR_IRQn);

	return (NRF_CCM->EVENTS_ERROR == 0);
}

uint32_t radio_ccm_mic_is_valid(void)
{
	return NRF_CCM->MICSTATUS;
}

static uint8_t MALIGN(4) _aar_scratch[3];

void radio_ar_configure(uint32_t nirk, void *irk)
{
	NRF_AAR->ENABLE = 1;
	NRF_AAR->NIRK = nirk;
	NRF_AAR->IRKPTR = (uint32_t)irk;
	NRF_AAR->ADDRPTR = (uint32_t)NRF_RADIO->PACKETPTR;
	NRF_AAR->SCRATCHPTR = (uint32_t)_aar_scratch[0];

	radio_bc_configure(64);

	NRF_PPI->CH[6].EEP = (uint32_t)&(NRF_RADIO->EVENTS_BCMATCH);
	NRF_PPI->CH[6].TEP = (uint32_t)&(NRF_AAR->TASKS_START);
	NRF_PPI->CHENSET = PPI_CHEN_CH6_Msk;
}

uint32_t radio_ar_match_get(void)
{
	return NRF_AAR->STATUS;
}

void radio_ar_status_reset(void)
{
	if (radio_bc_has_match()) {
		NRF_AAR->EVENTS_END = 0;
		NRF_AAR->EVENTS_RESOLVED = 0;
		NRF_AAR->EVENTS_NOTRESOLVED = 0;
	}

	radio_bc_status_reset();
}

uint32_t radio_ar_has_match(void)
{
	return (radio_bc_has_match() &&
			(NRF_AAR->EVENTS_END) &&
			(NRF_AAR->EVENTS_RESOLVED));
}