diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/fsl_qspi.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c index 61490c9..eae2f3a 100644 --- a/drivers/spi/fsl_qspi.c +++ b/drivers/spi/fsl_qspi.c @@ -194,12 +194,22 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, if (bus >= ARRAY_SIZE(spi_bases)) return NULL; + if (cs >= FSL_QSPI_FLASH_NUM) + return NULL; + qspi = spi_alloc_slave(struct fsl_qspi, bus, cs); if (!qspi) return NULL; qspi->reg_base = spi_bases[bus]; - qspi->amba_base = amba_bases[bus]; + /* + * According cs, use different amba_base to choose the + * corresponding flash devices. + * + * If not, only one flash device is used even if passing + * different cs using `sf probe` + */ + qspi->amba_base = amba_bases[bus] + cs * FSL_QSPI_FLASH_SIZE; qspi->slave.max_write_size = TX_BUFFER_SIZE; @@ -212,10 +222,20 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, qspi_write32(®s->mcr, QSPI_MCR_RESERVED_MASK); total_size = FSL_QSPI_FLASH_SIZE * FSL_QSPI_FLASH_NUM; - qspi_write32(®s->sfa1ad, FSL_QSPI_FLASH_SIZE | qspi->amba_base); - qspi_write32(®s->sfa2ad, FSL_QSPI_FLASH_SIZE | qspi->amba_base); - qspi_write32(®s->sfb1ad, total_size | qspi->amba_base); - qspi_write32(®s->sfb2ad, total_size | qspi->amba_base); + /* + * Any read access to non-implemented addresses will provide + * undefined results. + * + * In case single die flash devices, TOP_ADDR_MEMA2 and + * TOP_ADDR_MEMB2 should be initialized/programmed to + * TOP_ADDR_MEMA1 and TOP_ADDR_MEMB1 respectively - in effect, + * setting the size of these devices to 0. This would ensure + * that the complete memory map is assigned to only one flash device. + */ + qspi_write32(®s->sfa1ad, FSL_QSPI_FLASH_SIZE | amba_bases[bus]); + qspi_write32(®s->sfa2ad, FSL_QSPI_FLASH_SIZE | amba_bases[bus]); + qspi_write32(®s->sfb1ad, total_size | amba_bases[bus]); + qspi_write32(®s->sfb2ad, total_size | amba_bases[bus]); qspi_set_lut(qspi); |