| Andrii Tseglytskyi | 28095da | 2013-05-20 22:42:08 +0000 | [diff] [blame] | 1 | /* |
| 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 | * See file CREDITS for list of people who contributed to this |
| 11 | * project. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License as |
| 15 | * published by the Free Software Foundation; either version 2 of |
| 16 | * the License, or (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 26 | * MA 02111-1307 USA |
| 27 | */ |
| 28 | |
| 29 | #include <common.h> |
| 30 | #include <asm/omap_common.h> |
| 31 | #include <asm/io.h> |
| 32 | |
| 33 | /* |
| 34 | * Setup LDOVBB for OMAP5. |
| 35 | * On OMAP5+ some ABB settings are fused. They are handled |
| 36 | * in the following way: |
| 37 | * |
| 38 | * 1. corresponding EFUSE register contains ABB enable bit |
| 39 | * and VSET value |
| 40 | * 2. If ABB enable bit is set to 1, than ABB should be |
| 41 | * enabled, otherwise ABB should be disabled |
| 42 | * 3. If ABB is enabled, than VSET value should be copied |
| 43 | * to corresponding MUX control register |
| 44 | */ |
| 45 | s8 abb_setup_ldovbb(u32 fuse, u32 ldovbb) |
| 46 | { |
| 47 | u32 vset; |
| 48 | |
| 49 | /* |
| 50 | * ABB parameters must be properly fused |
| 51 | * otherwise ABB should be disabled |
| 52 | */ |
| 53 | vset = readl(fuse); |
| 54 | if (!(vset & OMAP5_ABB_FUSE_ENABLE_MASK)) |
| 55 | return -1; |
| 56 | |
| 57 | /* prepare VSET value for LDOVBB mux register */ |
| 58 | vset &= OMAP5_ABB_FUSE_VSET_MASK; |
| 59 | vset >>= ffs(OMAP5_ABB_FUSE_VSET_MASK) - 1; |
| 60 | vset <<= ffs(OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK) - 1; |
| 61 | vset |= OMAP5_ABB_LDOVBBMPU_MUX_CTRL_MASK; |
| 62 | |
| 63 | /* setup LDOVBB using fused value */ |
| 64 | clrsetbits_le32(ldovbb, OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK, vset); |
| 65 | |
| 66 | return 0; |
| 67 | } |