LXR uboot/arch/arm/mach-omap2/omap5/abb.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Adaptive Body Bias programming sequence for OMAP5 family
   4 *
   5 * (C) Copyright 2013
   6 * Texas Instruments, <www.ti.com>
   7 *
   8 * Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
   9 */
  10
  11#include <common.h>
  12#include <asm/omap_common.h>
  13#include <asm/io.h>
  14#include <linux/bitops.h>
  15
  16/*
  17 * Setup LDOVBB for OMAP5.
  18 * On OMAP5+ some ABB settings are fused. They are handled
  19 * in the following way:
  20 *
  21 * 1. corresponding EFUSE register contains ABB enable bit
  22 *    and VSET value
  23 * 2. If ABB enable bit is set to 1, than ABB should be
  24 *    enabled, otherwise ABB should be disabled
  25 * 3. If ABB is enabled, than VSET value should be copied
  26 *    to corresponding MUX control register
  27 */
  28s8 abb_setup_ldovbb(u32 fuse, u32 ldovbb)
  29{
  30        u32 vset;
  31        u32 fuse_enable_mask = OMAP5_PROD_ABB_FUSE_ENABLE_MASK;
  32        u32 fuse_vset_mask = OMAP5_PROD_ABB_FUSE_VSET_MASK;
  33
  34        if (!is_omap54xx()) {
  35                /* DRA7 */
  36                fuse_enable_mask = DRA7_ABB_FUSE_ENABLE_MASK;
  37                fuse_vset_mask = DRA7_ABB_FUSE_VSET_MASK;
  38        }
  39        /*
  40         * ABB parameters must be properly fused
  41         * otherwise ABB should be disabled
  42         */
  43        vset = readl(fuse);
  44        if (!(vset & fuse_enable_mask))
  45                return -1;
  46
  47        /* prepare VSET value for LDOVBB mux register */
  48        vset &= fuse_vset_mask;
  49        vset >>= ffs(fuse_vset_mask) - 1;
  50        vset <<= ffs(OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK) - 1;
  51        vset |= OMAP5_ABB_LDOVBBMPU_MUX_CTRL_MASK;
  52
  53        /* setup LDOVBB using fused value */
  54        clrsetbits_le32(ldovbb,  OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK, vset);
  55
  56        return 0;
  57}
  58