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Merge pull request #9438 from gebart/pr/kinetis-spi-scgc

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kinetis: Clean up SPI module power handling
This commit is contained in:
Peter Kietzmann 2018-06-28 09:35:44 +02:00 committed by GitHub
commit e684f49037
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1 changed files with 17 additions and 3 deletions
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20
cpu/kinetis/periph/spi.c
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@ -62,10 +62,16 @@ static inline void poweron(spi_t bus)
break;
#endif
}
/* Enable the module */
dev(bus)->MCR &= ~(SPI_MCR_MDIS_MASK);
}
static inline void poweroff(spi_t bus)
{
/* Disable the module */
dev(bus)->MCR |= SPI_MCR_MDIS_MASK;
switch((uint32_t)dev(bus)) {
case (uint32_t)SPI0:
case (uint32_t)SPI1:
@ -96,11 +102,14 @@ void spi_init(spi_t bus)
dev(bus)->MCR = (SPI_MCR_MSTR_MASK | SPI_MCR_PCSIS_MASK |
SPI_MCR_CLR_RXF_MASK | SPI_MCR_CLR_TXF_MASK |
SPI_MCR_DIS_RXF_MASK | SPI_MCR_DIS_TXF_MASK |
SPI_MCR_DOZE_MASK | SPI_MCR_HALT_MASK | SPI_MCR_MDIS_MASK);
SPI_MCR_DOZE_MASK | SPI_MCR_HALT_MASK);
/* disable all DMA and interrupt requests */
dev(bus)->RSER = 0;
/* Wait for the hardware to acknowledge the halt command */
while (dev(bus)->SR & SPI_SR_TXRXS_MASK) {}
/* and power off the bus until it is actually used */
poweroff(bus);
}
@ -153,8 +162,13 @@ int spi_acquire(spi_t bus, spi_cs_t cs, spi_mode_t mode, spi_clk_t clk)
void spi_release(spi_t bus)
{
/* disable, power off, and unlock the bus */
dev(bus)->MCR |= (SPI_MCR_HALT_MASK | SPI_MCR_MDIS_MASK);
/* Halt transfers */
dev(bus)->MCR |= SPI_MCR_HALT_MASK;
/* Wait for the module to acknowledge the stop */
while (dev(bus)->SR & SPI_SR_TXRXS_MASK) {}
/* Disable the module */
poweroff(bus);
mutex_unlock(&locks[bus]);
}