diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/exynos_spi.c | 9 | ||||
| -rw-r--r-- | drivers/spi/mxc_spi.c | 17 | ||||
| -rw-r--r-- | drivers/spi/spi.c | 2 |
3 files changed, 22 insertions, 6 deletions
diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c index c92276f..2969184 100644 --- a/drivers/spi/exynos_spi.c +++ b/drivers/spi/exynos_spi.c @@ -428,10 +428,6 @@ void spi_cs_activate(struct spi_slave *slave) clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT); debug("Activate CS, bus %d\n", spi_slave->slave.bus); spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE; - - /* Remember time of this transaction so we can honour the bus delay */ - if (spi_slave->bus->deactivate_delay_us) - spi_slave->last_transaction_us = timer_get_us(); } /** @@ -445,6 +441,11 @@ void spi_cs_deactivate(struct spi_slave *slave) struct exynos_spi_slave *spi_slave = to_exynos_spi(slave); setbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT); + + /* Remember time of this transaction so we can honour the bus delay */ + if (spi_slave->bus->deactivate_delay_us) + spi_slave->last_transaction_us = timer_get_us(); + debug("Deactivate CS, bus %d\n", spi_slave->slave.bus); } diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index f3f029d..2d5f385 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -30,6 +30,10 @@ static unsigned long spi_bases[] = { #define reg_read readl #define reg_write(a, v) writel(v, a) +#if !defined(CONFIG_SYS_SPI_MXC_WAIT) +#define CONFIG_SYS_SPI_MXC_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */ +#endif + struct mxc_spi_slave { struct spi_slave slave; unsigned long base; @@ -212,6 +216,8 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, int nbytes = DIV_ROUND_UP(bitlen, 8); u32 data, cnt, i; struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; + u32 ts; + int status; debug("%s: bitlen %d dout 0x%x din 0x%x\n", __func__, bitlen, (u32)dout, (u32)din); @@ -272,9 +278,16 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, reg_write(®s->ctrl, mxcs->ctrl_reg | MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH); + ts = get_timer(0); + status = reg_read(®s->stat); /* Wait until the TC (Transfer completed) bit is set */ - while ((reg_read(®s->stat) & MXC_CSPICTRL_TC) == 0) - ; + while ((status & MXC_CSPICTRL_TC) == 0) { + if (get_timer(ts) > CONFIG_SYS_SPI_MXC_WAIT) { + printf("spi_xchg_single: Timeout!\n"); + return -1; + } + status = reg_read(®s->stat); + } /* Transfer completed, clear any pending request */ reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 7ddea9b..7d81fbd 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -53,6 +53,8 @@ struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum, mode |= SPI_CPHA; if (fdtdec_get_bool(blob, node, "spi-cs-high")) mode |= SPI_CS_HIGH; + if (fdtdec_get_bool(blob, node, "spi-half-duplex")) + mode |= SPI_PREAMBLE; return spi_setup_slave(busnum, cs, max_hz, mode); } #endif |