diff options
| author | Max Krummenacher <max.krummenacher@toradex.com> | 2017-08-10 21:29:49 +0200 |
|---|---|---|
| committer | Stefan Agner <stefan.agner@toradex.com> | 2017-08-31 19:57:39 -0700 |
| commit | 8215b596c0b27598a8a36b82bc70b5e0202c3a90 (patch) | |
| tree | 0a77810408eaebbf8950e9c76845aabe187dc267 /board | |
| parent | 735d3a6c8eb0ed8891d7d6018297cb24eea1661c (diff) | |
colibri_imx6ull.c: setup all used uart to dte mode
Setup all UARTs in DTE mode, so that when Linux does the pinmuxing
the data direction is already correct and no two outputs are working
against each other.
Make sure that with the switch also the UARTs' RI and DCD interrupts
are masked.
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Diffstat (limited to 'board')
| -rw-r--r-- | board/toradex/colibri-imx6ull/colibri_imx6ull.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/board/toradex/colibri-imx6ull/colibri_imx6ull.c b/board/toradex/colibri-imx6ull/colibri_imx6ull.c index bf8643fcb5..6e15362360 100644 --- a/board/toradex/colibri-imx6ull/colibri_imx6ull.c +++ b/board/toradex/colibri-imx6ull/colibri_imx6ull.c @@ -188,8 +188,30 @@ static void setup_iomux_fec(void) } #endif +/* + * UARTs are used in DTE mode, switch the mode on all UARTs before + * any pinmuxing connects a (DCE) output to a transceiver output. + */ +#define UCR3 0x88 /* FIFO Control Register */ +#define UCR3_RI (1<<8) /* RIDELT DTE mode */ +#define UCR3_DCD (1<<9) /* DCDDELT DTE mode */ +#define UFCR 0x90 /* FIFO Control Register */ +#define UFCR_DCEDTE (1<<6) /* DCE=0 */ + +static void setup_dtemode_uart(void) +{ + setbits_le32((u32 *)(UART1_BASE + UFCR), UFCR_DCEDTE); + setbits_le32((u32 *)(UART2_BASE + UFCR), UFCR_DCEDTE); + setbits_le32((u32 *)(UART5_BASE + UFCR), UFCR_DCEDTE); + + clrbits_le32((u32 *)(UART1_BASE + UCR3), UCR3_DCD | UCR3_RI); + clrbits_le32((u32 *)(UART2_BASE + UCR3), UCR3_DCD | UCR3_RI); + clrbits_le32((u32 *)(UART5_BASE + UCR3), UCR3_DCD | UCR3_RI); +} + static void setup_iomux_uart(void) { + setup_dtemode_uart(); imx_iomux_v3_setup_multiple_pads(uart1_pads, ARRAY_SIZE(uart1_pads)); } |