| Stephen Warren | d3b8bdd | 2012-01-25 14:43:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/of.h> |
| 21 | |
| 22 | #include <mach/iomap.h> |
| 23 | |
| 24 | #define PMC_CTRL 0x0 |
| 25 | #define PMC_CTRL_INTR_LOW (1 << 17) |
| 26 | |
| 27 | static inline u32 tegra_pmc_readl(u32 reg) |
| 28 | { |
| 29 | return readl(IO_ADDRESS(TEGRA_PMC_BASE + reg)); |
| 30 | } |
| 31 | |
| 32 | static inline void tegra_pmc_writel(u32 val, u32 reg) |
| 33 | { |
| 34 | writel(val, IO_ADDRESS(TEGRA_PMC_BASE + reg)); |
| 35 | } |
| 36 | |
| 37 | #ifdef CONFIG_OF |
| 38 | static const struct of_device_id matches[] __initconst = { |
| 39 | { .compatible = "nvidia,tegra20-pmc" }, |
| 40 | { } |
| 41 | }; |
| 42 | #endif |
| 43 | |
| 44 | void __init tegra_pmc_init(void) |
| 45 | { |
| 46 | /* |
| 47 | * For now, Harmony is the only board that uses the PMC, and it wants |
| 48 | * the signal inverted. Seaboard would too if it used the PMC. |
| 49 | * Hopefully by the time other boards want to use the PMC, everything |
| 50 | * will be device-tree, or they also want it inverted. |
| 51 | */ |
| 52 | bool invert_interrupt = true; |
| 53 | u32 val; |
| 54 | |
| 55 | #ifdef CONFIG_OF |
| 56 | if (of_have_populated_dt()) { |
| 57 | struct device_node *np; |
| 58 | |
| 59 | invert_interrupt = false; |
| 60 | |
| 61 | np = of_find_matching_node(NULL, matches); |
| 62 | if (np) { |
| 63 | if (of_find_property(np, "nvidia,invert-interrupt", |
| 64 | NULL)) |
| 65 | invert_interrupt = true; |
| 66 | } |
| 67 | } |
| 68 | #endif |
| 69 | |
| 70 | val = tegra_pmc_readl(PMC_CTRL); |
| 71 | if (invert_interrupt) |
| 72 | val |= PMC_CTRL_INTR_LOW; |
| 73 | else |
| 74 | val &= ~PMC_CTRL_INTR_LOW; |
| 75 | tegra_pmc_writel(val, PMC_CTRL); |
| 76 | } |