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| author | Alexey Brodkin <abrodkin@synopsys.com> | 2018-05-21 16:42:07 +0300 |
|---|---|---|
| committer | Alexey Brodkin <abrodkin@synopsys.com> | 2018-05-24 15:59:17 +0300 |
| commit | 54705016ba705601acd32e04ff4e28b82f7ce71a (patch) | |
| tree | 26cdaecd5d444bbaac2c2417f65a9b25538e3ba1 /drivers/serial | |
| parent | d7ac185fd840d1406fcafc1b412482138475af82 (diff) | |
| download | u-boot-54705016ba705601acd32e04ff4e28b82f7ce71a.tar.gz u-boot-54705016ba705601acd32e04ff4e28b82f7ce71a.tar.bz2 u-boot-54705016ba705601acd32e04ff4e28b82f7ce71a.zip | |
serial/serial_arc: Implement debug serial
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/serial/serial_arc.c | 26 |
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 1aab0320f6..8777909860 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -197,6 +197,15 @@ config DEBUG_UART_AR933X driver will be available until the real driver model serial is running. +config DEBUG_ARC_SERIAL + bool "ARC UART" + depends on ARC_SERIAL + help + Select this to enable a debug UART using the ARC UART driver. + You will need to provide parameters to make this work. The + driver will be available until the real driver model serial is + running. + config DEBUG_UART_ATMEL bool "Atmel USART" help diff --git a/drivers/serial/serial_arc.c b/drivers/serial/serial_arc.c index da4a07ab2f..925f0c2555 100644 --- a/drivers/serial/serial_arc.c +++ b/drivers/serial/serial_arc.c @@ -130,3 +130,29 @@ U_BOOT_DRIVER(serial_arc) = { .ops = &arc_serial_ops, .flags = DM_FLAG_PRE_RELOC, }; + +#ifdef CONFIG_DEBUG_ARC_SERIAL +#include <debug_uart.h> + +static inline void _debug_uart_init(void) +{ + struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE; + int arc_console_baud = CONFIG_DEBUG_UART_CLOCK / (CONFIG_BAUDRATE * 4) - 1; + + writeb(arc_console_baud & 0xff, ®s->baudl); + writeb((arc_console_baud & 0xff00) >> 8, ®s->baudh); +} + +static inline void _debug_uart_putc(int c) +{ + struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE; + + while (!(readb(®s->status) & UART_TXEMPTY)) + ; + + writeb(c, ®s->data); +} + +DEBUG_UART_FUNCS + +#endif |