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feat(nxp-drivers): add Linflex flush callback

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Implement a flush callback for the Linflex UART driver to avoid cases
where the BL31 stage reinitializes the console while there is ongoing TX
initiated by the BL2.

Change-Id: Ic49852f809198362de1f993474c7c45f1439dc98
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
This commit is contained in:
Ghennadi Procopciuc 2024-08-06 23:41:45 +03:00
parent 553b70c3ef
commit 95ac568b61
2 changed files with 43 additions and 1 deletions
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42
drivers/nxp/console/linflex_console.S
View file

@ -18,6 +18,7 @@
#define LINFLEX_LINSR (0x8)
#define LINSR_LINS_INITMODE (0x00001000)
#define LINSR_LINS_RX_TX_MODE (0x00008000)
#define LINSR_LINS_MASK (0x0000F000)
#define LINFLEX_UARTCR (0x10)
@ -48,9 +49,11 @@
*/
.globl console_linflex_core_init
.globl console_linflex_core_putc
.globl console_linflex_core_flush
.globl console_linflex_register
.globl console_linflex_putc
.globl console_linflex_flush
/**
* uint32_t get_ldiv_mult(uintptr_t baseaddr, uint32_t clock,
@ -175,9 +178,28 @@ func console_linflex_register
str x0, [x3, #CONSOLE_T_BASE]
mov x0, x3
finish_console_register linflex, putc=1, getc=0, flush=0
finish_console_register linflex, putc=1, getc=0, flush=1
endfunc console_linflex_register
/**
* int console_linflex_core_flush(uintptr_t baseaddr);
*
* Loop while the TX fifo is not empty, depending on the selected UART mode.
*
* In: x0 - Linflex base address
* Clobber list : x0 - x1
*/
func console_linflex_core_flush
wait_rx_tx:
ldr w1, [x0, LINFLEX_LINSR]
and w1, w1, #LINSR_LINS_MASK
cmp w1, #LINSR_LINS_RX_TX_MODE
b.eq wait_rx_tx
mov x0, #0
ret
endfunc console_linflex_core_flush
/**
* int console_linflex_core_putc(int c, uintptr_t baseaddr);
@ -257,3 +279,21 @@ puct_error:
mov x0, #-EINVAL
ret
endfunc console_linflex_putc
/**
* int console_linflex_flush(console_t *console);
*
* Function to wait for the TX FIFO to be cleared.
* In : x0 - pointer to console_t struct
* Out: x0 - return -1 on error else return 0.
* Clobber list : x0 - x1
*/
func console_linflex_flush
cbz x0, flush_error
ldr x0, [x0, #CONSOLE_T_BASE]
b console_linflex_core_flush
flush_error:
mov x0, #-EINVAL
ret
endfunc console_linflex_flush

2
plat/nxp/s32/s32g274ardb2/plat_helpers.S
View file

@ -38,6 +38,8 @@ endfunc plat_crash_console_putc
/* void plat_crash_console_flush(void); */
func plat_crash_console_flush
mov_imm x0, UART_BASE
b console_linflex_core_flush
ret
endfunc plat_crash_console_flush