mtk-preloader/platform/common/storage/mmc/msdc_utils.c

/* Copyright Statement:
*
* This software/firmware and related documentation ("MediaTek Software") are
* protected under relevant copyright laws. The information contained herein
* is confidential and proprietary to MediaTek Inc. and/or its licensors.
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* any reproduction, modification, use or disclosure of MediaTek Software,
* and information contained herein, in whole or in part, shall be strictly prohibited.
*/
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* The following software/firmware and/or related documentation ("MediaTek Software")
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*/

#include "msdc.h"

unsigned int msdc_uffs(unsigned int x)
{
	unsigned int r = 1;

	if (!x)
		return 0;
	if (!(x & 0xffff)) {
		x >>= 16;
		r += 16;
	}
	if (!(x & 0xff)) {
		x >>= 8;
		r += 8;
	}
	if (!(x & 0xf)) {
		x >>= 4;
		r += 4;
	}
	if (!(x & 3)) {
		x >>= 2;
		r += 2;
	}
	if (!(x & 1)) {
		x >>= 1;
		r += 1;
	}
	return r;
}

unsigned int msdc_ntohl(unsigned int n)
{
	unsigned int t;
	unsigned char *b = (unsigned char*)&t;
	*b++ = ((n >> 24) & 0xFF);
	*b++ = ((n >> 16) & 0xFF);
	*b++ = ((n >> 8) & 0xFF);
	*b   = ((n) & 0xFF);
	return t;
}

void msdc_get_field(volatile u32 *reg, u32 field, u32 *val)
{
	u32 tv = (u32)*reg;
	*val = ((tv & (field)) >> (msdc_uffs((unsigned int)field) - 1));
}