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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>
This commit is contained in:
Julius Werner
parent
17cd67d2af
commit
36c42ca111
2 changed files with 147 additions and 26 deletions
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@ -6,15 +6,24 @@
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#include <arch.h>
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#include <asm_macros.S>
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#include <assert_macros.S>
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#include <console_macros.S>
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#include <uart_16550.h>
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.globl console_core_init
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.globl console_core_putc
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.globl console_core_getc
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.globl console_core_flush
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/*
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* "core" functions are low-level implementations that don't require
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* writable memory and are thus safe to call in BL1 crash context.
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*/
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.globl console_16550_core_init
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.globl console_16550_core_putc
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.globl console_16550_core_getc
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.globl console_16550_putc
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.globl console_16550_getc
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/* -----------------------------------------------
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* int console_core_init(unsigned long base_addr,
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* int console_16550_core_init(uintptr_t base_addr,
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* unsigned int uart_clk, unsigned int baud_rate)
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* Function to initialize the console without a
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* C Runtime to print debug information. This
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@ -23,11 +32,11 @@
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* In: x0 - console base address
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* w1 - Uart clock in Hz
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* w2 - Baud rate
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* Out: return 1 on success
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* Out: return 1 on success, 0 on error
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* Clobber list : x1, x2, x3
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* -----------------------------------------------
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*/
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func console_core_init
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func console_16550_core_init
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/* Check the input base address */
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cbz x0, init_fail
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/* Check baud rate and uart clock for sanity */
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@ -63,12 +72,57 @@ func console_core_init
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mov w3, #3
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str w3, [x0, #UARTMCR]
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mov w0, #1
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init_fail:
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ret
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endfunc console_core_init
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init_fail:
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mov w0, #0
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ret
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endfunc console_16550_core_init
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#if MULTI_CONSOLE_API
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.globl console_16550_register
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/* -----------------------------------------------
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* int console_16550_register(console_16550_t *console,
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uintptr_t base, uint32_t clk, uint32_t baud)
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* Function to initialize and register a new 16550
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* console. Storage passed in for the console struct
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* *must* be persistent (i.e. not from the stack).
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* In: x0 - UART register base address
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* w1 - UART clock in Hz
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* w2 - Baud rate
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* x3 - pointer to empty console_16550_t struct
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* Out: return 1 on success, 0 on error
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* Clobber list : x0, x1, x2, x6, x7, x14
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* -----------------------------------------------
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*/
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func console_16550_register
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mov x7, x30
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mov x6, x3
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cbz x6, register_fail
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str x0, [x6, #CONSOLE_T_16550_BASE]
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bl console_16550_core_init
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cbz x0, register_fail
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mov x0, x6
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mov x30, x7
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finish_console_register 16550
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register_fail:
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ret x7
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endfunc console_16550_register
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#else
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.globl console_core_init
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.globl console_core_putc
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.globl console_core_getc
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.globl console_core_flush
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.equ console_core_init,console_16550_core_init
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.equ console_core_putc,console_16550_core_putc
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.equ console_core_getc,console_16550_core_getc
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#endif
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/* --------------------------------------------------------
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* int console_core_putc(int c, unsigned int base_addr)
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* int console_16550_core_putc(int c, uintptr_t base_addr)
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* Function to output a character over the console. It
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* returns the character printed on success or -1 on error.
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* In : w0 - character to be printed
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@ -77,9 +131,11 @@ endfunc console_core_init
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* Clobber list : x2
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* --------------------------------------------------------
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*/
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func console_core_putc
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/* Check the input parameter */
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cbz x1, putc_error
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func console_16550_core_putc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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/* Prepend '\r' to '\n' */
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cmp w0, #0xA
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@ -99,34 +155,75 @@ func console_core_putc
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b.ne 2b
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str w0, [x1, #UARTTX]
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ret
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putc_error:
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mov w0, #-1
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ret
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endfunc console_core_putc
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endfunc console_16550_core_putc
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/* --------------------------------------------------------
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* int console_16550_putc(int c, console_16550_t *console)
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* Function to output a character over the console. It
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* returns the character printed on success or -1 on error.
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* In : w0 - character to be printed
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* x1 - pointer to console_t structure
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* Out : return -1 on error else return character.
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* Clobber list : x2
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* --------------------------------------------------------
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*/
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func console_16550_putc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr x1, [x1, #CONSOLE_T_16550_BASE]
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b console_16550_core_putc
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endfunc console_16550_putc
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/* ---------------------------------------------
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* int console_core_getc(void)
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* int console_16550_core_getc(uintptr_t base_addr)
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* Function to get a character from the console.
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* It returns the character grabbed on success
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* or -1 on error.
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* In : w0 - console base address
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* Out : return -1 on error else return character.
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* or -1 on if no character is available.
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* In : x0 - console base address
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* Out : w0 - character if available, else -1
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_core_getc
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func console_16550_core_getc
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#if ENABLE_ASSERTIONS
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cmp x0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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/* Check if the receive FIFO is empty */
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1: ldr w1, [x0, #UARTLSR]
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tbz w1, #UARTLSR_RDR_BIT, 1b
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tbz w1, #UARTLSR_RDR_BIT, no_char
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ldr w0, [x0, #UARTRX]
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ret
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getc_error:
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mov w0, #-1
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no_char:
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mov w0, #ERROR_NO_PENDING_CHAR
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ret
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endfunc console_core_getc
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endfunc console_16550_core_getc
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/* ---------------------------------------------
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* int console_16550_getc(console_16550_t *console)
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* Function to get a character from the console.
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* It returns the character grabbed on success
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* or -1 on if no character is available.
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* In : x0 - pointer to console_t stucture
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* Out : w0 - character if available, else -1
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_16550_getc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr x0, [x0, #CONSOLE_T_16550_BASE]
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b console_16550_core_getc
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endfunc console_16550_getc
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/* ---------------------------------------------
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* int console_core_flush(uintptr_t base_addr)
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* DEPRECATED: Not used with MULTI_CONSOLE_API!
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* Function to force a write of all buffered
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* data that hasn't been output.
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* In : x0 - console base address
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@ -7,6 +7,8 @@
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#ifndef __UART_16550_H__
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#define __UART_16550_H__
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#include <console.h>
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/* UART16550 Registers */
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#define UARTTX 0x0
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#define UARTRX 0x0
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@ -67,4 +69,26 @@
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#define UARTLSR_RDR_BIT (0) /* Rx Data Ready Bit */
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#define UARTLSR_RDR (1 << UARTLSR_RDR_BIT) /* Rx Data Ready */
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#define CONSOLE_T_16550_BASE CONSOLE_T_DRVDATA
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#ifndef __ASSEMBLY__
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#include <types.h>
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typedef struct {
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console_t console;
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uintptr_t base;
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} console_16550_t;
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/*
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* Initialize a new 16550 console instance and register it with the console
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* framework. The |console| pointer must point to storage that will be valid
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* for the lifetime of the console, such as a global or static local variable.
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* Its contents will be reinitialized from scratch.
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*/
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int console_16550_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
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console_16550_t *console);
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#endif /*__ASSEMBLY__*/
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#endif /* __UART_16550_H__ */
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