| Nishanth Menon | fd1478c | 2010-12-09 09:13:46 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * OMAP SoC specific OPP wrapper function |
| 3 | * |
| 4 | * Copyright (C) 2009-2010 Texas Instruments Incorporated - http://www.ti.com/ |
| 5 | * Nishanth Menon |
| 6 | * Kevin Hilman |
| 7 | * Copyright (C) 2010 Nokia Corporation. |
| 8 | * Eduardo Valentin |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 15 | * kind, whether express or implied; without even the implied warranty |
| 16 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/opp.h> |
| 21 | |
| 22 | #include <plat/omap_device.h> |
| 23 | |
| 24 | #include "omap_opp_data.h" |
| 25 | |
| 26 | /* Temp variable to allow multiple calls */ |
| 27 | static u8 __initdata omap_table_init; |
| 28 | |
| 29 | /** |
| 30 | * omap_init_opp_table() - Initialize opp table as per the CPU type |
| 31 | * @opp_def: opp default list for this silicon |
| 32 | * @opp_def_size: number of opp entries for this silicon |
| 33 | * |
| 34 | * Register the initial OPP table with the OPP library based on the CPU |
| 35 | * type. This is meant to be used only by SoC specific registration. |
| 36 | */ |
| 37 | int __init omap_init_opp_table(struct omap_opp_def *opp_def, |
| 38 | u32 opp_def_size) |
| 39 | { |
| 40 | int i, r; |
| 41 | |
| 42 | if (!opp_def || !opp_def_size) { |
| 43 | pr_err("%s: invalid params!\n", __func__); |
| 44 | return -EINVAL; |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * Initialize only if not already initialized even if the previous |
| 49 | * call failed, because, no reason we'd succeed again. |
| 50 | */ |
| 51 | if (omap_table_init) |
| 52 | return -EEXIST; |
| 53 | omap_table_init = 1; |
| 54 | |
| 55 | /* Lets now register with OPP library */ |
| 56 | for (i = 0; i < opp_def_size; i++) { |
| 57 | struct omap_hwmod *oh; |
| 58 | struct device *dev; |
| 59 | |
| 60 | if (!opp_def->hwmod_name) { |
| 61 | pr_err("%s: NULL name of omap_hwmod, failing [%d].\n", |
| 62 | __func__, i); |
| 63 | return -EINVAL; |
| 64 | } |
| 65 | oh = omap_hwmod_lookup(opp_def->hwmod_name); |
| 66 | if (!oh || !oh->od) { |
| 67 | pr_warn("%s: no hwmod or odev for %s, [%d] " |
| 68 | "cannot add OPPs.\n", __func__, |
| 69 | opp_def->hwmod_name, i); |
| 70 | return -EINVAL; |
| 71 | } |
| 72 | dev = &oh->od->pdev.dev; |
| 73 | |
| 74 | r = opp_add(dev, opp_def->freq, opp_def->u_volt); |
| 75 | if (r) { |
| 76 | dev_err(dev, "%s: add OPP %ld failed for %s [%d] " |
| 77 | "result=%d\n", |
| 78 | __func__, opp_def->freq, |
| 79 | opp_def->hwmod_name, i, r); |
| 80 | } else { |
| 81 | if (!opp_def->default_available) |
| 82 | r = opp_disable(dev, opp_def->freq); |
| 83 | if (r) |
| 84 | dev_err(dev, "%s: disable %ld failed for %s " |
| 85 | "[%d] result=%d\n", |
| 86 | __func__, opp_def->freq, |
| 87 | opp_def->hwmod_name, i, r); |
| 88 | } |
| 89 | opp_def++; |
| 90 | } |
| 91 | |
| 92 | return 0; |
| 93 | } |