diff options
| author | Benjamin Fair <b-fair@ti.com> | 2016-10-14 01:13:33 +0000 |
|---|---|---|
| committer | Andrew F. Davis <afd@ti.com> | 2018-06-11 14:26:32 -0500 |
| commit | 529b541e8b81f68bb6ee3c6ecdb43b5cbe0a9d70 (patch) | |
| tree | cadc10f646fc59c247530c65dd45ff78088d8e6a /drivers/ti | |
| parent | 11bebd7cab0873d04ad8f1d3ccd538f4d5b80ccb (diff) | |
drivers: ti: uart: Add TI specific 16550 initialization
On TI platforms the UART is disabled by default and must be explicitly
enabled using the MDR1 register.
NOTE: The original definition of
http://www.ti.com/lit/ds/symlink/pc16550d.pdf has no MDR register, but
many TI SoCs implementing 16550 do have a quirky MDR register
implemented. So, this should be enabled with TI_16550_MDR_QUIRK
NOTE: In such implementation, the CSR register does not exist.
Signed-off-by: Benjamin Fair <b-fair@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Diffstat (limited to 'drivers/ti')
| -rw-r--r-- | drivers/ti/uart/aarch64/16550_console.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/ti/uart/aarch64/16550_console.S b/drivers/ti/uart/aarch64/16550_console.S index 56e7e5c1..d46fa611 100644 --- a/drivers/ti/uart/aarch64/16550_console.S +++ b/drivers/ti/uart/aarch64/16550_console.S @@ -66,6 +66,10 @@ func console_16550_core_init /* no interrupt */ mov w3, #0 str w3, [x0, #UARTIER] +#ifdef TI_16550_MDR_QUIRK + /* UART must be enabled on some platforms via the MDR register */ + str w3, [x0, #UARTMDR1] +#endif /* TI_16550_MDR_QUIRK */ /* enable fifo, DMA */ mov w3, #(UARTFCR_FIFOEN | UARTFCR_DMAEN) str w3, [x0, #UARTFCR] |