a860cb7bff
Introduces the SYS_DEFINE_DEVICE() macro, which supports 5 distinct levels of device initialization and 100 priorities within each level. Note: The existing init macros (e.g. nano_early_init()) have been adapted to utilize the enhanced initialization model, but will eventually be retired. Change-Id: If677029d8b711a3fae9b2f32b5470cd97d19aeda Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
70 lines
2 KiB
C
70 lines
2 KiB
C
#include <string.h>
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#include <device.h>
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#include <misc/util.h>
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extern struct device __device_init_start[];
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extern struct device __device_PRIMARY_start[];
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extern struct device __device_SECONDARY_start[];
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extern struct device __device_NANOKERNEL_start[];
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extern struct device __device_MICROKERNEL_start[];
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extern struct device __device_APPLICATION_start[];
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extern struct device __device_init_end[];
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static struct device *config_levels[] = {
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__device_PRIMARY_start,
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__device_SECONDARY_start,
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__device_NANOKERNEL_start,
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__device_MICROKERNEL_start,
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__device_APPLICATION_start,
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__device_init_end,
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};
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/**
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* @brief Execute all the device initialization functions at a given level
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*
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* @details Invokes the initialization routine for each device object
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* created by the SYS_DEFINE_DEVICE() macro using the specified level.
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* The linker script places the device objects in memory in the order
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* they need to be invoked, with symbols indicating where one level leaves
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* off and the next one begins.
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*
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* @param level init level to run.
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*/
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void _sys_device_do_config_level(int level)
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{
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struct device *info;
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for (info = config_levels[level]; info < config_levels[level+1]; info++) {
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struct device_config *device = info->config;
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device->init(info);
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}
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}
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/**
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* @brief Retrieve the device structure for a driver by name
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*
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* @details Driver config object are created via the
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* DECLARE_DEVICE_INIT_CONFIG() macro and placed in ROM by the
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* linker. If a driver needs to bind to another driver it will use
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* this function to retrieve the device structure of the lower level
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* driver by the name the driver exposes to the system.
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*
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* @param name driver name to search for.
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*/
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struct device* device_get_binding(char *name)
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{
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struct device *info;
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struct device *found = 0;
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int level;
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for (level = 0; level < ARRAY_SIZE(config_levels) - 1; level++) {
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for (info = config_levels[level];
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info < config_levels[level+1]; info++) {
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struct device_config *device = info->config;
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if (!strcmp(name, device->name)) {
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return info;
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}
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}
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}
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return found;
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}
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