diff options
| author | Christophe Kerello <christophe.kerello@st.com> | 2018-05-14 15:42:54 +0200 |
|---|---|---|
| committer | Jagan Teki <jagan@amarulasolutions.com> | 2018-05-16 18:41:21 +0530 |
| commit | 495f3b2ae5368f3fd64a35a4fc02427b3875949a (patch) | |
| tree | f19d6676e81033e5f913283e7a0384417af7aa62 /drivers | |
| parent | 76afe56a446ef884cb515db9cf1de000084a8b94 (diff) | |
spi: stm32_qspi: Add chip select management
Quad-SPI interface is able to manage 2 spi nor devices.
FSEL bit selects the flash memory to be addressed in single flash mode.
Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/stm32_qspi.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/spi/stm32_qspi.c b/drivers/spi/stm32_qspi.c index 9fe8b297a4..56ea591123 100644 --- a/drivers/spi/stm32_qspi.c +++ b/drivers/spi/stm32_qspi.c @@ -155,6 +155,8 @@ enum STM32_QSPI_CCR_FMODE { /* default SCK frequency, unit: HZ */ #define STM32_QSPI_DEFAULT_SCK_FREQ 108000000 +#define STM32_MAX_NORCHIP 2 + struct stm32_qspi_platdata { u32 base; u32 memory_map; @@ -212,6 +214,12 @@ static void _stm32_qspi_set_flash_size(struct stm32_qspi_priv *priv, u32 size) fsize << STM32_QSPI_DCR_FSIZE_SHIFT); } +static void _stm32_qspi_set_cs(struct stm32_qspi_priv *priv, unsigned int cs) +{ + clrsetbits_le32(&priv->regs->cr, STM32_QSPI_CR_FSEL, + cs ? STM32_QSPI_CR_FSEL : 0); +} + static unsigned int _stm32_qspi_gen_ccr(struct stm32_qspi_priv *priv) { unsigned int ccr_reg = 0; @@ -497,10 +505,17 @@ static int stm32_qspi_claim_bus(struct udevice *dev) struct stm32_qspi_priv *priv; struct udevice *bus; struct spi_flash *flash; + struct dm_spi_slave_platdata *slave_plat; bus = dev->parent; priv = dev_get_priv(bus); flash = dev_get_uclass_priv(dev); + slave_plat = dev_get_parent_platdata(dev); + + if (slave_plat->cs >= STM32_MAX_NORCHIP) + return -ENODEV; + + _stm32_qspi_set_cs(priv, slave_plat->cs); _stm32_qspi_set_flash_size(priv, flash->size); |