| Tom Warren | d0edce4 | 2013-03-25 16:22:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | |
| 17 | /* Tegra cache routines */ |
| 18 | |
| 19 | #include <common.h> |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/arch-tegra/ap.h> |
| 22 | #include <asm/arch/gp_padctrl.h> |
| 23 | |
| 24 | void config_cache(void) |
| 25 | { |
| 26 | struct apb_misc_gp_ctlr *gp = |
| 27 | (struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE; |
| 28 | u32 reg = 0; |
| 29 | |
| 30 | /* enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg */ |
| 31 | asm volatile( |
| 32 | "mrc p15, 0, r0, c1, c0, 1\n" |
| 33 | "orr r0, r0, #0x41\n" |
| 34 | "mcr p15, 0, r0, c1, c0, 1\n"); |
| 35 | |
| 36 | /* Currently, only T114 needs this L2 cache change to boot Linux */ |
| 37 | reg = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK); |
| 38 | if (reg != (CHIPID_TEGRA114 << HIDREV_CHIPID_SHIFT)) |
| 39 | return; |
| 40 | /* |
| 41 | * Systems with an architectural L2 cache must not use the PL310. |
| 42 | * Config L2CTLR here for a data RAM latency of 3 cycles. |
| 43 | */ |
| 44 | asm("mrc p15, 1, %0, c9, c0, 2" : : "r" (reg)); |
| 45 | reg &= ~7; |
| 46 | reg |= 2; |
| 47 | asm("mcr p15, 1, %0, c9, c0, 2" : : "r" (reg)); |
| 48 | } |