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kerneldoc: Annotate drivers/serial/serial.c

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Add kerneldoc annotations into serial core.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
This commit is contained in:
Marek Vasut 2012-10-08 11:36:39 +00:00 committed by Tom Rini
parent dee1941604
commit 9cd2b9e47e
1 changed files with 165 additions and 0 deletions
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165
drivers/serial/serial.c
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@ -33,10 +33,28 @@ DECLARE_GLOBAL_DATA_PTR;
static struct serial_device *serial_devices;
static struct serial_device *serial_current;
/**
* serial_null() - Void registration routine of a serial driver
*
* This routine implements a void registration routine of a serial
* driver. The registration routine of a particular driver is aliased
* to this empty function in case the driver is not compiled into
* U-Boot.
*/
static void serial_null(void)
{
}
/**
* serial_initfunc() - Forward declare of driver registration routine
* @name: Name of the real driver registration routine.
*
* This macro expands onto forward declaration of a driver registration
* routine, which is then used below in serial_initialize() function.
* The declaration is made weak and aliases to serial_null() so in case
* the driver is not compiled in, the function is still declared and can
* be used, but aliases to serial_null() and thus is optimized away.
*/
#define serial_initfunc(name) \
void name(void) \
__attribute__((weak, alias("serial_null")));
@ -95,6 +113,16 @@ serial_initfunc(s3c44b0_serial_initialize);
serial_initfunc(sa1100_serial_initialize);
serial_initfunc(sh_serial_initialize);
/**
* serial_register() - Register serial driver with serial driver core
* @dev: Pointer to the serial driver structure
*
* This function registers the serial driver supplied via @dev with
* serial driver core, thus making U-Boot aware of it and making it
* available for U-Boot to use. On platforms that still require manual
* relocation of constant variables, relocation of the supplied structure
* is performed.
*/
void serial_register(struct serial_device *dev)
{
#ifdef CONFIG_NEEDS_MANUAL_RELOC
@ -118,6 +146,15 @@ void serial_register(struct serial_device *dev)
serial_devices = dev;
}
/**
* serial_initialize() - Register all compiled-in serial port drivers
*
* This function registers all serial port drivers that are compiled
* into the U-Boot binary with the serial core, thus making them
* available to U-Boot to use. Lastly, this function assigns a default
* serial port to the serial core. That serial port is then used as a
* default output.
*/
void serial_initialize(void)
{
mpc8xx_serial_initialize();
@ -177,6 +214,13 @@ void serial_initialize(void)
serial_assign(default_serial_console()->name);
}
/**
* serial_stdio_init() - Register serial ports with STDIO core
*
* This function generates a proxy driver for each serial port driver.
* These proxy drivers then register with the STDIO core, making the
* serial drivers available as STDIO devices.
*/
void serial_stdio_init(void)
{
struct stdio_dev dev;
@ -201,6 +245,18 @@ void serial_stdio_init(void)
}
}
/**
* serial_assign() - Select the serial output device by name
* @name: Name of the serial driver to be used as default output
*
* This function configures the serial output multiplexing by
* selecting which serial device will be used as default. In case
* the STDIO "serial" device is selected as stdin/stdout/stderr,
* the serial device previously configured by this function will be
* used for the particular operation.
*
* Returns 0 on success, negative on error.
*/
int serial_assign(const char *name)
{
struct serial_device *s;
@ -215,6 +271,12 @@ int serial_assign(const char *name)
return -EINVAL;
}
/**
* serial_reinit_all() - Reinitialize all compiled-in serial ports
*
* This function reinitializes all serial ports that are compiled
* into U-Boot by calling their serial_start() functions.
*/
void serial_reinit_all(void)
{
struct serial_device *s;
@ -223,6 +285,21 @@ void serial_reinit_all(void)
s->start();
}
/**
* get_current() - Return pointer to currently selected serial port
*
* This function returns a pointer to currently selected serial port.
* The currently selected serial port is altered by serial_assign()
* function.
*
* In case this function is called before relocation or before any serial
* port is configured, this function calls default_serial_console() to
* determine the serial port. Otherwise, the configured serial port is
* returned.
*
* Returns pointer to the currently selected serial port on success,
* NULL on error.
*/
static struct serial_device *get_current(void)
{
struct serial_device *dev;
@ -247,36 +324,113 @@ static struct serial_device *get_current(void)
return dev;
}
/**
* serial_init() - Initialize currently selected serial port
*
* This function initializes the currently selected serial port. This
* usually involves setting up the registers of that particular port,
* enabling clock and such. This function uses the get_current() call
* to determine which port is selected.
*
* Returns 0 on success, negative on error.
*/
int serial_init(void)
{
return get_current()->start();
}
/**
* serial_setbrg() - Configure baud-rate of currently selected serial port
*
* This function configures the baud-rate of the currently selected
* serial port. The baud-rate is retrieved from global data within
* the serial port driver. This function uses the get_current() call
* to determine which port is selected.
*
* Returns 0 on success, negative on error.
*/
void serial_setbrg(void)
{
get_current()->setbrg();
}
/**
* serial_getc() - Read character from currently selected serial port
*
* This function retrieves a character from currently selected serial
* port. In case there is no character waiting on the serial port,
* this function will block and wait for the character to appear. This
* function uses the get_current() call to determine which port is
* selected.
*
* Returns the character on success, negative on error.
*/
int serial_getc(void)
{
return get_current()->getc();
}
/**
* serial_tstc() - Test if data is available on currently selected serial port
*
* This function tests if one or more characters are available on
* currently selected serial port. This function never blocks. This
* function uses the get_current() call to determine which port is
* selected.
*
* Returns positive if character is available, zero otherwise.
*/
int serial_tstc(void)
{
return get_current()->tstc();
}
/**
* serial_putc() - Output character via currently selected serial port
* @c: Single character to be output from the serial port.
*
* This function outputs a character via currently selected serial
* port. This character is passed to the serial port driver responsible
* for controlling the hardware. The hardware may still be in process
* of transmitting another character, therefore this function may block
* for a short amount of time. This function uses the get_current()
* call to determine which port is selected.
*/
void serial_putc(const char c)
{
get_current()->putc(c);
}
/**
* serial_puts() - Output string via currently selected serial port
* @s: Zero-terminated string to be output from the serial port.
*
* This function outputs a zero-terminated string via currently
* selected serial port. This function behaves as an accelerator
* in case the hardware can queue multiple characters for transfer.
* The whole string that is to be output is available to the function
* implementing the hardware manipulation. Transmitting the whole
* string may take some time, thus this function may block for some
* amount of time. This function uses the get_current() call to
* determine which port is selected.
*/
void serial_puts(const char *s)
{
get_current()->puts(s);
}
/**
* default_serial_puts() - Output string by calling serial_putc() in loop
* @s: Zero-terminated string to be output from the serial port.
*
* This function outputs a zero-terminated string by calling serial_putc()
* in a loop. Most drivers do not support queueing more than one byte for
* transfer, thus this function precisely implements their serial_puts().
*
* To optimize the number of get_current() calls, this function only
* calls get_current() once and then directly accesses the putc() call
* of the &struct serial_device .
*/
void default_serial_puts(const char *s)
{
struct serial_device *dev = get_current();
@ -287,6 +441,17 @@ void default_serial_puts(const char *s)
#if CONFIG_POST & CONFIG_SYS_POST_UART
static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
/**
* uart_post_test() - Test the currently selected serial port using POST
* @flags: POST framework flags
*
* Do a loopback test of the currently selected serial port. This
* function is only useful in the context of the POST testing framwork.
* The serial port is firstly configured into loopback mode and then
* characters are sent through it.
*
* Returns 0 on success, value otherwise.
*/
/* Mark weak until post/cpu/.../uart.c migrate over */
__weak
int uart_post_test(int flags)