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Commit 4a0c4571 authored by Julius Werner's avatar Julius Werner
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drivers: arm: pl011: Update PL011 driver to support MULTI_CONSOLE_API 



This patch updates the ARM PL011 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: Ic34e4158addbb0c5fae500c9cff899c05a4f4206
Signed-off-by: default avatarJulius Werner <jwerner@chromium.org>
parent 36c42ca1
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Inline Side-by-side
drivers/arm/pl011/aarch64/pl011_console.S
View file @ 4a0c4571
......@@ -5,6 +5,7 @@
*/
#include <arch.h>
#include <asm_macros.S>
#include <assert_macros.S>
#include <pl011.h>
/*
......@@ -13,15 +14,21 @@
*/
#include "../../../console/aarch64/console.S"
/*
* "core" functions are low-level implementations that don't require
* writable memory and are thus safe to call in BL1 crash context.
*/
.globl console_pl011_core_init
.globl console_pl011_core_putc
.globl console_pl011_core_getc
.globl console_pl011_core_flush
.globl console_core_init
.globl console_core_putc
.globl console_core_getc
.globl console_core_flush
.globl console_pl011_putc
.globl console_pl011_getc
.globl console_pl011_flush
/* -----------------------------------------------
* int console_core_init(uintptr_t base_addr,
* int console_pl011_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
......@@ -34,7 +41,7 @@
* Clobber list : x1, x2, x3, x4
* -----------------------------------------------
*/
func console_core_init
func console_pl011_core_init
/* Check the input base address */
cbz x0, core_init_fail
#if !PL011_GENERIC_UART
......@@ -71,10 +78,54 @@ func console_core_init
core_init_fail:
mov w0, wzr
ret
endfunc console_core_init
endfunc console_pl011_core_init
#if MULTI_CONSOLE_API
.globl console_pl011_register
/* -----------------------------------------------
* int console_pl011_register(console_pl011_t *console,
uintptr_t base, uint32_t clk, uint32_t baud)
* Function to initialize and register a new PL011
* 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_pl011_t struct
* Out: return 1 on success, 0 on error
* Clobber list : x0, x1, x2, x6, x7, x14
* -----------------------------------------------
*/
func console_pl011_register
mov x7, x30
mov x6, x3
cbz x6, register_fail
str x0, [x6, #CONSOLE_T_PL011_BASE]
bl console_pl011_core_init
cbz x0, register_fail
mov x0, x6
mov x30, x7
finish_console_register pl011
register_fail:
ret x7
endfunc console_pl011_register
#else
.globl console_core_init
.globl console_core_putc
.globl console_core_getc
.globl console_core_flush
.equ console_core_init,console_pl011_core_init
.equ console_core_putc,console_pl011_core_putc
.equ console_core_getc,console_pl011_core_getc
.equ console_core_flush,console_pl011_core_flush
#endif
/* --------------------------------------------------------
* int console_core_putc(int c, uintptr_t base_addr)
* int console_pl011_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
......@@ -83,9 +134,12 @@ endfunc console_core_init
* Clobber list : x2
* --------------------------------------------------------
*/
func console_core_putc
/* Check the input parameter */
cbz x1, putc_error
func console_pl011_core_putc
#if ENABLE_ASSERTIONS
cmp x1, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
/* Prepend '\r' to '\n' */
cmp w0, #0xA
b.ne 2f
......@@ -101,36 +155,75 @@ func console_core_putc
tbnz w2, #PL011_UARTFR_TXFF_BIT, 2b
str w0, [x1, #UARTDR]
ret
putc_error:
mov w0, #-1
ret
endfunc console_core_putc
endfunc console_pl011_core_putc
/* --------------------------------------------------------
* int console_pl011_putc(int c, console_pl011_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_pl011_putc
#if ENABLE_ASSERTIONS
cmp x1, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
ldr x1, [x1, #CONSOLE_T_PL011_BASE]
b console_pl011_core_putc
endfunc console_pl011_putc
/* ---------------------------------------------
* int console_core_getc(uintptr_t base_addr)
* int console_pl011_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.
* or -1 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
cbz x0, getc_error
1:
func console_pl011_core_getc
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
/* Check if the receive FIFO is empty */
ldr w1, [x0, #UARTFR]
tbnz w1, #PL011_UARTFR_RXFE_BIT, 1b
tbnz w1, #PL011_UARTFR_RXFE_BIT, no_char
ldr w1, [x0, #UARTDR]
mov w0, w1
ret
getc_error:
mov w0, #-1
no_char:
mov w0, #ERROR_NO_PENDING_CHAR
ret
endfunc console_core_getc
endfunc console_pl011_core_getc
/* ---------------------------------------------
* int console_pl011_getc(console_pl011_t *console)
* Function to get a character from the console.
* It returns the character grabbed on success
* or -1 if no character is available.
* In : x0 - pointer to console_t structure
* Out: w0 - character if available, else -1
* Clobber list : x0, x1
* ---------------------------------------------
*/
func console_pl011_getc
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
ldr x0, [x0, #CONSOLE_T_PL011_BASE]
b console_pl011_core_getc
endfunc console_pl011_getc
/* ---------------------------------------------
* int console_core_flush(uintptr_t base_addr)
* int console_pl011_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
......@@ -138,9 +231,11 @@ endfunc console_core_getc
* Clobber list : x0, x1
* ---------------------------------------------
*/
func console_core_flush
cbz x0, flush_error
func console_pl011_core_flush
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
1:
/* Loop until the transmit FIFO is empty */
ldr w1, [x0, #UARTFR]
......@@ -148,7 +243,22 @@ func console_core_flush
mov w0, #0
ret
flush_error:
mov w0, #-1
ret
endfunc console_core_flush
endfunc console_pl011_core_flush
/* ---------------------------------------------
* int console_pl011_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_pl011_flush
#if ENABLE_ASSERTIONS
cmp x0, #0
ASM_ASSERT(ne)
#endif /* ENABLE_ASSERTIONS */
ldr x0, [x0, #CONSOLE_T_PL011_BASE]
b console_pl011_core_flush
endfunc console_pl011_flush
include/drivers/arm/pl011.h
View file @ 4a0c4571
......@@ -7,6 +7,8 @@
#ifndef __PL011_H__
#define __PL011_H__
#include <console.h>
/* PL011 Registers */
#define UARTDR 0x000
#define UARTRSR 0x004
......@@ -79,4 +81,26 @@
#endif /* !PL011_GENERIC_UART */
#define CONSOLE_T_PL011_BASE CONSOLE_T_DRVDATA
#ifndef __ASSEMBLY__
#include <types.h>
typedef struct {
console_t console;
uintptr_t base;
} console_pl011_t;
/*
* Initialize a new PL011 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_pl011_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
console_pl011_t *console);
#endif /*__ASSEMBLY__*/
#endif /* __PL011_H__ */
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