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drivers: ti: uart: Update 16550 UART driver to support MULTI_CONSOLE_API 

This patch updates the TI 16550 console driver to support the new
console API. The driver will continue to support the old API as well by
checking the MULTI_CONSOLE_API compile-time flag.

Change-Id: I60a44b7ba3c35c74561824c04b8dbe3e3039324c
Signed-off-by: Julius Werner <jwerner@chromium.org>
pull/1193/head
Julius Werner 7 years ago
parent
17cd67d2af
commit
36c42ca111
2 changed files with 146 additions and 25 deletions
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  1. 147
      drivers/ti/uart/aarch64/16550_console.S
  2. 24
      include/drivers/ti/uart/uart_16550.h

147
drivers/ti/uart/aarch64/16550_console.S
View File

@ -6,15 +6,24 @@
#include <arch.h>
#include <asm_macros.S>
#include <assert_macros.S>
#include <console_macros.S>
#include <uart_16550.h>
.globl console_core_init
.globl console_core_putc
.globl console_core_getc
.globl console_core_flush
/*
* "core" functions are low-level implementations that don't require
* writable memory and are thus safe to call in BL1 crash context.
*/
.globl console_16550_core_init
.globl console_16550_core_putc
.globl console_16550_core_getc
.globl console_16550_putc
.globl console_16550_getc
/* -----------------------------------------------
* int console_core_init(unsigned long base_addr,
* int console_16550_core_init(uintptr_t base_addr,
* unsigned int uart_clk, unsigned int baud_rate)
* Function to initialize the console without a
* C Runtime to print debug information. This
@ -23,11 +32,11 @@
* In: x0 - console base address
* w1 - Uart clock in Hz
* w2 - Baud rate
* Out: return 1 on success
* Out: return 1 on success, 0 on error
* Clobber list : x1, x2, x3
* -----------------------------------------------
*/
func console_core_init
func console_16550_core_init
/* Check the input base address */
cbz x0, init_fail
/* Check baud rate and uart clock for sanity */
@ -63,12 +72,57 @@ func console_core_init
mov w3, #3
str w3, [x0, #UARTMCR]
mov w0, #1
ret
init_fail:
mov w0, #0
ret
endfunc console_core_init
endfunc console_16550_core_init
#if MULTI_CONSOLE_API
.globl console_16550_register
/* -----------------------------------------------
* int console_16550_register(console_16550_t *console,
uintptr_t base, uint32_t clk, uint32_t baud)
* Function to initialize and register a new 16550
* console. Storage passed in for the console struct
* *must* be persistent (i.e. not from the stack).
* In: x0 - UART register base address
* w1 - UART clock in Hz
* w2 - Baud rate
* x3 - pointer to empty console_16550_t struct
* Out: return 1 on success, 0 on error
* Clobber list : x0, x1, x2, x6, x7, x14
* -----------------------------------------------
*/
func console_16550_register
mov x7, x30
mov x6, x3
cbz x6, register_fail
str x0, [x6, #CONSOLE_T_16550_BASE]
bl console_16550_core_init
cbz x0, register_fail
mov x0, x6
mov x30, x7
finish_console_register 16550
register_fail:
ret x7
endfunc console_16550_register
#else
.globl console_core_init
.globl console_core_putc
.globl console_core_getc
.globl console_core_flush
.equ console_core_init,console_16550_core_init
.equ console_core_putc,console_16550_core_putc
.equ console_core_getc,console_16550_core_getc
#endif
/* --------------------------------------------------------
* int console_core_putc(int c, unsigned int base_addr)
* int console_16550_core_putc(int c, uintptr_t base_addr)
* Function to output a character over the console. It
* returns the character printed on success or -1 on error.
* In : w0 - character to be printed
@ -77,9 +131,11 @@ endfunc console_core_init
* Clobber list : x2
* --------------------------------------------------------
*/
func console_core_putc
/* Check the input parameter */
cbz x1, putc_error
func console_16550_core_putc
#if ENABLE_ASSERTIONS
cmp x1, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
/* Prepend '\r' to '\n' */
cmp w0, #0xA
@ -99,34 +155,75 @@ func console_core_putc
b.ne 2b
str w0, [x1, #UARTTX]
ret
putc_error:
mov w0, #-1
ret
endfunc console_core_putc
endfunc console_16550_core_putc
/* --------------------------------------------------------
* int console_16550_putc(int c, console_16550_t *console)
* Function to output a character over the console. It
* returns the character printed on success or -1 on error.
* In : w0 - character to be printed
* x1 - pointer to console_t structure
* Out : return -1 on error else return character.
* Clobber list : x2
* --------------------------------------------------------
*/
func console_16550_putc
#if ENABLE_ASSERTIONS
cmp x1, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
ldr x1, [x1, #CONSOLE_T_16550_BASE]
b console_16550_core_putc
endfunc console_16550_putc
/* ---------------------------------------------
* int console_core_getc(void)
* int console_16550_core_getc(uintptr_t base_addr)
* Function to get a character from the console.
* It returns the character grabbed on success
* or -1 on error.
* In : w0 - console base address
* Out : return -1 on error else return character.
* or -1 on if no character is available.
* In : x0 - console base address
* Out : w0 - character if available, else -1
* Clobber list : x0, x1
* ---------------------------------------------
*/
func console_core_getc
func console_16550_core_getc
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
/* Check if the receive FIFO is empty */
1: ldr w1, [x0, #UARTLSR]
tbz w1, #UARTLSR_RDR_BIT, 1b
tbz w1, #UARTLSR_RDR_BIT, no_char
ldr w0, [x0, #UARTRX]
ret
getc_error:
mov w0, #-1
no_char:
mov w0, #ERROR_NO_PENDING_CHAR
ret
endfunc console_core_getc
endfunc console_16550_core_getc
/* ---------------------------------------------
* int console_16550_getc(console_16550_t *console)
* Function to get a character from the console.
* It returns the character grabbed on success
* or -1 on if no character is available.
* In : x0 - pointer to console_t stucture
* Out : w0 - character if available, else -1
* Clobber list : x0, x1
* ---------------------------------------------
*/
func console_16550_getc
#if ENABLE_ASSERTIONS
cmp x1, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
ldr x0, [x0, #CONSOLE_T_16550_BASE]
b console_16550_core_getc
endfunc console_16550_getc
/* ---------------------------------------------
* int console_core_flush(uintptr_t base_addr)
* DEPRECATED: Not used with MULTI_CONSOLE_API!
* Function to force a write of all buffered
* data that hasn't been output.
* In : x0 - console base address

24
include/drivers/ti/uart/uart_16550.h
View File

@ -7,6 +7,8 @@
#ifndef __UART_16550_H__
#define __UART_16550_H__
#include <console.h>
/* UART16550 Registers */
#define UARTTX 0x0
#define UARTRX 0x0
@ -67,4 +69,26 @@
#define UARTLSR_RDR_BIT (0) /* Rx Data Ready Bit */
#define UARTLSR_RDR (1 << UARTLSR_RDR_BIT) /* Rx Data Ready */
#define CONSOLE_T_16550_BASE CONSOLE_T_DRVDATA
#ifndef __ASSEMBLY__
#include <types.h>
typedef struct {
console_t console;
uintptr_t base;
} console_16550_t;
/*
* Initialize a new 16550 console instance and register it with the console
* framework. The |console| pointer must point to storage that will be valid
* for the lifetime of the console, such as a global or static local variable.
* Its contents will be reinitialized from scratch.
*/
int console_16550_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
console_16550_t *console);
#endif /*__ASSEMBLY__*/
#endif /* __UART_16550_H__ */

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