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// SPDX-License-Identifier: GPL-2.0+
/*
* Adaptive Body Bias programming sequence for OMAP5 family
*
* (C) Copyright 2013
* Texas Instruments, <www.ti.com>
*
* Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
*/
#include <common.h>
#include <asm/omap_common.h>
#include <asm/io.h>
#include <linux/bitops.h>
/*
* Setup LDOVBB for OMAP5.
* On OMAP5+ some ABB settings are fused. They are handled
* in the following way:
*
* 1. corresponding EFUSE register contains ABB enable bit
* and VSET value
* 2. If ABB enable bit is set to 1, than ABB should be
* enabled, otherwise ABB should be disabled
* 3. If ABB is enabled, than VSET value should be copied
* to corresponding MUX control register
*/
s8 abb_setup_ldovbb(u32 fuse, u32 ldovbb)
{
u32 vset;
u32 fuse_enable_mask = OMAP5_PROD_ABB_FUSE_ENABLE_MASK;
u32 fuse_vset_mask = OMAP5_PROD_ABB_FUSE_VSET_MASK;
if (!is_omap54xx()) {
/* DRA7 */
fuse_enable_mask = DRA7_ABB_FUSE_ENABLE_MASK;
fuse_vset_mask = DRA7_ABB_FUSE_VSET_MASK;
}
/*
* ABB parameters must be properly fused
* otherwise ABB should be disabled
*/
vset = readl(fuse);
if (!(vset & fuse_enable_mask))
return -1;
/* prepare VSET value for LDOVBB mux register */
vset &= fuse_vset_mask;
vset >>= ffs(fuse_vset_mask) - 1;
vset <<= ffs(OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK) - 1;
vset |= OMAP5_ABB_LDOVBBMPU_MUX_CTRL_MASK;
/* setup LDOVBB using fused value */
clrsetbits_le32(ldovbb, OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK, vset);
return 0;
}
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