Esempi in C++ (Cpp) per ATMEL_SPI_CSRx_SCBR

Esempio n. 1

File: atmel_spi.c Progetto: ahedlund/u-boot-xlnx

static int atmel_spi_claim_bus(struct udevice *dev)
{
	struct udevice *bus = dev_get_parent(dev);
	struct atmel_spi_platdata *bus_plat = dev_get_platdata(bus);
	struct atmel_spi_priv *priv = dev_get_priv(bus);
	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
	struct at91_spi *reg_base = bus_plat->regs;
	u32 cs = slave_plat->cs;
	u32 freq = priv->freq;
	u32 scbr, csrx, mode;

	scbr = (priv->bus_clk_rate + freq - 1) / freq;
	if (scbr > ATMEL_SPI_CSRx_SCBR_MAX)
		return -EINVAL;

	if (scbr < 1)
		scbr = 1;

	csrx = ATMEL_SPI_CSRx_SCBR(scbr);
	csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8);

	if (!(priv->mode & SPI_CPHA))
		csrx |= ATMEL_SPI_CSRx_NCPHA;
	if (priv->mode & SPI_CPOL)
		csrx |= ATMEL_SPI_CSRx_CPOL;

	writel(csrx, &reg_base->csr[cs]);

	mode = ATMEL_SPI_MR_MSTR |
	       ATMEL_SPI_MR_MODFDIS |
	       ATMEL_SPI_MR_WDRBT |
	       ATMEL_SPI_MR_PCS(~(1 << cs));

	writel(mode, &reg_base->mr);

	writel(ATMEL_SPI_CR_SPIEN, &reg_base->cr);

	return 0;
}

Esempio n. 2

File: atmel_spi.c Progetto: ahedlund/u-boot-xlnx

struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
			unsigned int max_hz, unsigned int mode)
{
	struct atmel_spi_slave	*as;
	unsigned int		scbr;
	u32			csrx;
	void			*regs;

	if (!spi_cs_is_valid(bus, cs))
		return NULL;

	switch (bus) {
	case 0:
		regs = (void *)ATMEL_BASE_SPI0;
		break;
#ifdef ATMEL_BASE_SPI1
	case 1:
		regs = (void *)ATMEL_BASE_SPI1;
		break;
#endif
#ifdef ATMEL_BASE_SPI2
	case 2:
		regs = (void *)ATMEL_BASE_SPI2;
		break;
#endif
#ifdef ATMEL_BASE_SPI3
	case 3:
		regs = (void *)ATMEL_BASE_SPI3;
		break;
#endif
	default:
		return NULL;
	}


	scbr = (get_spi_clk_rate(bus) + max_hz - 1) / max_hz;
	if (scbr > ATMEL_SPI_CSRx_SCBR_MAX)
		/* Too low max SCK rate */
		return NULL;
	if (scbr < 1)
		scbr = 1;

	csrx = ATMEL_SPI_CSRx_SCBR(scbr);
	csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8);
	if (!(mode & SPI_CPHA))
		csrx |= ATMEL_SPI_CSRx_NCPHA;
	if (mode & SPI_CPOL)
		csrx |= ATMEL_SPI_CSRx_CPOL;

	as = spi_alloc_slave(struct atmel_spi_slave, bus, cs);
	if (!as)
		return NULL;

	as->regs = regs;
	as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS
			| ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf);
	if (spi_has_wdrbt(as))
		as->mr |= ATMEL_SPI_MR_WDRBT;

	spi_writel(as, CSR(cs), csrx);

	return &as->slave;
}

Esempio n. 3

File: atmel_spi.c Progetto: Medvedroid/OT_903D-kernel-2.6.35.7

struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
			unsigned int max_hz, unsigned int mode)
{
	struct atmel_spi_slave	*as;
	unsigned int		scbr;
	u32			csrx;
	void			*regs;

	if (cs > 3 || !spi_cs_is_valid(bus, cs))
		return NULL;

	switch (bus) {
	case 0:
		regs = (void *)SPI0_BASE;
		break;
#ifdef SPI1_BASE
	case 1:
		regs = (void *)SPI1_BASE;
		break;
#endif
#ifdef SPI2_BASE
	case 2:
		regs = (void *)SPI2_BASE;
		break;
#endif
#ifdef SPI3_BASE
	case 3:
		regs = (void *)SPI3_BASE;
		break;
#endif
	default:
		return NULL;
	}


	scbr = (get_spi_clk_rate(bus) + max_hz - 1) / max_hz;
	if (scbr > ATMEL_SPI_CSRx_SCBR_MAX)
		/* Too low max SCK rate */
		return NULL;
	if (scbr < 1)
		scbr = 1;

	csrx = ATMEL_SPI_CSRx_SCBR(scbr);
	csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8);
	if (!(mode & SPI_CPHA))
		csrx |= ATMEL_SPI_CSRx_NCPHA;
	if (mode & SPI_CPOL)
		csrx |= ATMEL_SPI_CSRx_CPOL;

	as = malloc(sizeof(struct atmel_spi_slave));
	if (!as)
		return NULL;

	as->slave.bus = bus;
	as->slave.cs = cs;
	as->regs = regs;
	as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS
			| ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf);
	spi_writel(as, CSR(cs), csrx);

	return &as->slave;
}