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drivers: ti: 16550: Implement console flush 

Replace placeholder by actual implementation.

Change-Id: I0861b1ac5304b0d2d7c32d7d9a48bd985e258e92
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz 2018-03-22 20:13:44 +00:00
parent f13ef37a38
commit 4f8053dd28
1 changed files with 36 additions and 7 deletions
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43
drivers/ti/uart/aarch64/16550_console.S
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -17,10 +17,11 @@
.globl console_16550_core_init
.globl console_16550_core_putc
.globl console_16550_core_getc
.globl console_16550_core_flush
.globl console_16550_putc
.globl console_16550_getc
.globl console_16550_flush
/* -----------------------------------------------
* int console_16550_core_init(uintptr_t base_addr,
@ -119,6 +120,7 @@ endfunc console_16550_register
.equ console_core_init,console_16550_core_init
.equ console_core_putc,console_16550_core_putc
.equ console_core_getc,console_16550_core_getc
.equ console_core_flush,console_16550_core_flush
#endif
/* --------------------------------------------------------
@ -222,8 +224,7 @@ func console_16550_getc
endfunc console_16550_getc
/* ---------------------------------------------
* int console_core_flush(uintptr_t base_addr)
* DEPRECATED: Not used with MULTI_CONSOLE_API!
* int console_16550_core_flush(uintptr_t base_addr)
* Function to force a write of all buffered
* data that hasn't been output.
* In : x0 - console base address
@ -231,8 +232,36 @@ endfunc console_16550_getc
* Clobber list : x0, x1
* ---------------------------------------------
*/
func console_core_flush
/* Placeholder */
func console_16550_core_flush
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
/* Loop until the transmit FIFO is empty */
1: ldr w1, [x0, #UARTLSR]
and w1, w1, #(UARTLSR_TEMT | UARTLSR_THRE)
cmp w1, #(UARTLSR_TEMT | UARTLSR_THRE)
b.ne 1b
mov w0, #0
ret
endfunc console_core_flush
endfunc console_16550_core_flush
/* ---------------------------------------------
* int console_16550_flush(console_pl011_t *console)
* Function to force a write of all buffered
* data that hasn't been output.
* In : x0 - pointer to console_t structure
* Out : return -1 on error else return 0.
* Clobber list : x0, x1
* ---------------------------------------------
*/
func console_16550_flush
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
ldr x0, [x0, #CONSOLE_T_16550_BASE]
b console_16550_core_flush
endfunc console_16550_flush