#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/avm_hw_config.h>
#include <linux/env.h>

struct _avm_hw_config *avm_current_hw_config = NULL;
EXPORT_SYMBOL(avm_current_hw_config);

struct _avm_hw_config *avm_get_hw_config_table(void)
{
	static struct _avm_hw_config *current_config_table = NULL;
	unsigned int hwrev, hwsubrev, i;
	char *s;

	if (current_config_table)
		return current_config_table;

	s = prom_getenv("HWRevision");
	hwrev = s ? simple_strtoul(s, NULL, 10) : 0;

	s = prom_getenv("HWSubRevision");
	hwsubrev = s ? simple_strtoul(s, NULL, 10) : 1;

	if (unlikely(hwrev == 0)) {
		pr_alert("avm-hw-config: no HWRevision detected in environment variables\n");
		BUG_ON(1);
		return NULL;
	}

	for (i = 0; avm_hw_config_tables[i].hwrev; i++) {
		if (avm_hw_config_tables[i].hwrev != hwrev)
			continue;

		if ((avm_hw_config_tables[i].hwsubrev == 0) ||
		    (avm_hw_config_tables[i].hwsubrev == hwsubrev)) {
			current_config_table = avm_hw_config_tables[i].table;
			return current_config_table;
		}
	}
	pr_alert("avm-hw-config: No hardware configuration found for HWRevision %d\n",
		 hwrev);
	BUG_ON(1);
	return NULL;
}
EXPORT_SYMBOL(avm_get_hw_config_table);