分类： LINUX
2013-01-04 12:56:50
u-boot 串口初始化
printf()
==================================================================
board_init_r (gd_t *id, ulong dest_addr)
-------->serial_initialize()
{
#if defined(CONFIG_AML_MESON)
serial_aml_register();---------->下面.
#endif
serial_assign (default_serial_console ()->name);
}
\uboot\arch\arm\cpu\aml_meson):void serial_aml_register(void)
void serial_aml_register(void)
{
serial_register(&device_UART_PORT_0);---------->下面
serial_register(&device_UART_PORT_1);//参数在哪里呢？ ------>
#ifdef UART_PORT_AO |
serial_register(&device_UART_PORT_AO); |
#endif |
} |
int serial_register (struct serial_device *dev)
{
#ifdef CONFIG_NEEDS_MANUAL_RELOC
dev->init += gd->reloc_off;
dev->setbrg += gd->reloc_off;
dev->getc += gd->reloc_off;
dev->tstc += gd->reloc_off;
dev->putc += gd->reloc_off;
dev->puts += gd->reloc_off;
#endif
dev->next = serial_devices;
serial_devices = dev;
return 0;
--------------------------参数--------------------------------
#define INIT_UART_STRUCTURE(port,name,bus)
static struct serial_device device_##port={\ name,\
bus,\
uart_##port##_init,\
NULL,\
uart_##port##_setbrg,\
uart_##port##_getc,\
uart_##port##_tstc,\
uart_##port##_putc,\
uart_##port##_puts, }
DECLARE_UART_FUNCTIONS(UART_PORT_0);
INIT_UART_STRUCTURE(UART_PORT_0,"uart0","UART0");
DECLARE_UART_FUNCTIONS(UART_PORT_1);
INIT_UART_STRUCTURE(UART_PORT_1,"uart1","UART1");
#ifdef UART_PORT_AO
DECLARE_UART_FUNCTIONS(UART_PORT_AO);
INIT_UART_STRUCTURE(UART_PORT_AO,"uart_ao","UART_AO");
#endif
INIT_UART_STRUCTURE(UART_PORT_0,"uart0","UART0");
----> static struct serial_device device_UART_PORT_0={
....
uart_UART_PORT_0_getc,------| 这些函数在下面:
.... |
} |
#define DECLARE_UART_FUNCTIONS(port) \
static int uart_##port##_init (void) {\
serial_init_port(port); return(0);}\
static void uart_##port##_setbrg (void) {\
serial_setbrg_port(port);}\
uart_UART_PORT_0_getc ---->static int uart_##port##_getc (void) {\
return serial_getc_port(port);}\
static int uart_##port##_tstc (void) {\
return serial_tstc_port(port);}\
static void uart_##port##_putc (const char c) {\
serial_putc_port(port, c);}\
static void uart_##port##_puts (const char *s) {\
serial_puts_port(port, s);}
int serial_assign (char *name) -->参数中的结构?
{
struct serial_device *s;
for (s = serial_devices; s; s = s->next) {
if (strcmp (s->name, name) == 0) {
serial_current = s;
return 0;
}
}
return 1;
}
struct serial_device * default_serial_console (void)
{
#if (UART_PORT_CONS==UART_PORT_0)
return &device_UART_PORT_0;
#elif (UART_PORT_CONS==UART_PORT_1)
return &device_UART_PORT_1;
#else
#ifdef UART_PORT_AO
#if (UART_PORT_CONS==UART_PORT_AO)
return &device_UART_PORT_AO;
#else
#error "invalid uart port index defined"
#endif
#endif
#endif
int printf(const char *fmt, ...) \uboot\com
{
va_list args;
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
va_start(args, fmt);
/* For this to work, printbuffer must be
* anything we ever want to print.
*/
i = vsprintf(printbuffer, fmt, args);
va_end(args);
/* Print the string */
puts(printbuffer); -------------------->
return i;
}
void puts(const char *s)
{
#ifdef CONFIG_SILENT_CONSOLE
if (gd->flags & GD_FLG_SILENT)
return;
#endif
#ifdef CONFIG_DISABLE_CONSOLE
if (gd->flags & GD_FLG_DISABLE_CONSOLE)
return;
#endif
if (gd->flags & GD_FLG_DEVINIT) {
/* Send to the standard output */
fputs(stdout, s);
} else {
/* Send directly to the handler */
serial_puts(s); ----->这里才是调用我们的SOC级的驱动
}
}
-------------------------------------------------------------------------------->
void serial_putc(const char c){ \uboot\arch\arm\cpu\aml_meson\serial.c
serial_putc_port(UART_PORT_CONS,c);
}
int serial_tstc(void){
return serial_tstc_port(UART_PORT_CONS);
}
int serial_getc(void){
return serial_getc_port(UART_PORT_CONS);
}
void serial_puts(const char * s){
serial_puts_port(UART_PORT_CONS,s);
}
void serial_setbrg(void){
serial_setbrg_port(UART_PORT_CONS);
}
