diff options
Diffstat (limited to 'drivers/spi/atmel_spi.c')
| -rw-r--r-- | drivers/spi/atmel_spi.c | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c index 3cdfd366ab..122c6d107d 100644 --- a/drivers/spi/atmel_spi.c +++ b/drivers/spi/atmel_spi.c @@ -26,206 +26,6 @@ DECLARE_GLOBAL_DATA_PTR; -#ifndef CONFIG_DM_SPI - -static int spi_has_wdrbt(struct atmel_spi_slave *slave) -{ - unsigned int ver; - - ver = spi_readl(slave, VERSION); - - return (ATMEL_SPI_VERSION_REV(ver) >= 0x210); -} - -void spi_init() -{ - -} - -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; -} - -void spi_free_slave(struct spi_slave *slave) -{ - struct atmel_spi_slave *as = to_atmel_spi(slave); - - free(as); -} - -int spi_claim_bus(struct spi_slave *slave) -{ - struct atmel_spi_slave *as = to_atmel_spi(slave); - - /* Enable the SPI hardware */ - spi_writel(as, CR, ATMEL_SPI_CR_SPIEN); - - /* - * Select the slave. This should set SCK to the correct - * initial state, etc. - */ - spi_writel(as, MR, as->mr); - - return 0; -} - -void spi_release_bus(struct spi_slave *slave) -{ - struct atmel_spi_slave *as = to_atmel_spi(slave); - - /* Disable the SPI hardware */ - spi_writel(as, CR, ATMEL_SPI_CR_SPIDIS); -} - -int spi_xfer(struct spi_slave *slave, unsigned int bitlen, - const void *dout, void *din, unsigned long flags) -{ - struct atmel_spi_slave *as = to_atmel_spi(slave); - unsigned int len_tx; - unsigned int len_rx; - unsigned int len; - u32 status; - const u8 *txp = dout; - u8 *rxp = din; - u8 value; - - if (bitlen == 0) - /* Finish any previously submitted transfers */ - goto out; - - /* - * TODO: The controller can do non-multiple-of-8 bit - * transfers, but this driver currently doesn't support it. - * - * It's also not clear how such transfers are supposed to be - * represented as a stream of bytes...this is a limitation of - * the current SPI interface. - */ - if (bitlen % 8) { - /* Errors always terminate an ongoing transfer */ - flags |= SPI_XFER_END; - goto out; - } - - len = bitlen / 8; - - /* - * The controller can do automatic CS control, but it is - * somewhat quirky, and it doesn't really buy us much anyway - * in the context of U-Boot. - */ - if (flags & SPI_XFER_BEGIN) { - spi_cs_activate(slave); - /* - * sometimes the RDR is not empty when we get here, - * in theory that should not happen, but it DOES happen. - * Read it here to be on the safe side. - * That also clears the OVRES flag. Required if the - * following loop exits due to OVRES! - */ - spi_readl(as, RDR); - } - - for (len_tx = 0, len_rx = 0; len_rx < len; ) { - status = spi_readl(as, SR); - - if (status & ATMEL_SPI_SR_OVRES) - return -1; - - if (len_tx < len && (status & ATMEL_SPI_SR_TDRE)) { - if (txp) - value = *txp++; - else - value = 0; - spi_writel(as, TDR, value); - len_tx++; - } - if (status & ATMEL_SPI_SR_RDRF) { - value = spi_readl(as, RDR); - if (rxp) - *rxp++ = value; - len_rx++; - } - } - -out: - if (flags & SPI_XFER_END) { - /* - * Wait until the transfer is completely done before - * we deactivate CS. - */ - do { - status = spi_readl(as, SR); - } while (!(status & ATMEL_SPI_SR_TXEMPTY)); - - spi_cs_deactivate(slave); - } - - return 0; -} - -#else - #define MAX_CS_COUNT 4 struct atmel_spi_platdata { @@ -515,4 +315,3 @@ U_BOOT_DRIVER(atmel_spi) = { .priv_auto_alloc_size = sizeof(struct atmel_spi_priv), .probe = atmel_spi_probe, }; -#endif |