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| author | Carlo Caione <carlo@caione.org> | 2014-09-09 21:38:00 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2014-09-25 17:31:53 +0200 |
| commit | d8a00916b30313879c814144c18f27b8100bc401 (patch) | |
| tree | e4ebab5a6f96f7b8c6e9e464e8bc6e9bfeb96e7b /arch/arm/include/debug | |
| parent | 4fdea26762c6095b18c22ca19bc3857064620ae4 (diff) | |
| download | lwn-d8a00916b30313879c814144c18f27b8100bc401.tar.gz lwn-d8a00916b30313879c814144c18f27b8100bc401.zip | |
ARM: meson: debug: add debug UART for earlyprintk support
Add the UART definitions needed to support earlyprintk for MesonX SoCs
on UARTAO.
Signed-off-by: Carlo Caione <carlo@caione.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/include/debug')
| -rw-r--r-- | arch/arm/include/debug/meson.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/include/debug/meson.S b/arch/arm/include/debug/meson.S new file mode 100644 index 000000000000..1bae99bf6f11 --- /dev/null +++ b/arch/arm/include/debug/meson.S @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2014 Carlo Caione + * Carlo Caione <carlo@caione.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define MESON_AO_UART_WFIFO 0x0 +#define MESON_AO_UART_STATUS 0xc + +#define MESON_AO_UART_TX_FIFO_EMPTY (1 << 22) +#define MESON_AO_UART_TX_FIFO_FULL (1 << 21) + + .macro addruart, rp, rv, tmp + ldr \rp, =(CONFIG_DEBUG_UART_PHYS) @ physical + ldr \rv, =(CONFIG_DEBUG_UART_VIRT) @ virtual + .endm + + .macro senduart,rd,rx + str \rd, [\rx, #MESON_AO_UART_WFIFO] + .endm + + .macro busyuart,rd,rx +1002: ldr \rd, [\rx, #MESON_AO_UART_STATUS] + tst \rd, #MESON_AO_UART_TX_FIFO_EMPTY + beq 1002b + .endm + + .macro waituart,rd,rx +1001: ldr \rd, [\rx, #MESON_AO_UART_STATUS] + tst \rd, #MESON_AO_UART_TX_FIFO_FULL + bne 1001b + .endm |