projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| fd1478cd NM |
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> | |
| 92d51856 | 20 | #include <linux/of.h> |
| e4db1c74 | 21 | #include <linux/pm_opp.h> |
| 24d7b40a | 22 | #include <linux/cpu.h> |
| fd1478cd | 23 | |
| 25c7d49e | 24 | #include "omap_device.h" |
| fd1478cd NM |
25 | |
| 26 | #include "omap_opp_data.h" | |
| 27 | ||
| 28 | /* Temp variable to allow multiple calls */ | |
| 29 | static u8 __initdata omap_table_init; | |
| 30 | ||
| 31 | /** | |
| 32 | * omap_init_opp_table() - Initialize opp table as per the CPU type | |
| 33 | * @opp_def: opp default list for this silicon | |
| 34 | * @opp_def_size: number of opp entries for this silicon | |
| 35 | * | |
| 36 | * Register the initial OPP table with the OPP library based on the CPU | |
| 37 | * type. This is meant to be used only by SoC specific registration. | |
| 38 | */ | |
| 39 | int __init omap_init_opp_table(struct omap_opp_def *opp_def, | |
| 40 | u32 opp_def_size) | |
| 41 | { | |
| 42 | int i, r; | |
| 43 | ||
| 92d51856 NM |
44 | if (of_have_populated_dt()) |
| 45 | return -EINVAL; | |
| 46 | ||
| fd1478cd NM |
47 | if (!opp_def || !opp_def_size) { |
| 48 | pr_err("%s: invalid params!\n", __func__); | |
| 49 | return -EINVAL; | |
| 50 | } | |
| 51 | ||
| 52 | /* | |
| 53 | * Initialize only if not already initialized even if the previous | |
| 54 | * call failed, because, no reason we'd succeed again. | |
| 55 | */ | |
| 56 | if (omap_table_init) | |
| 57 | return -EEXIST; | |
| 58 | omap_table_init = 1; | |
| 59 | ||
| 60 | /* Lets now register with OPP library */ | |
| b110547e | 61 | for (i = 0; i < opp_def_size; i++, opp_def++) { |
| fd1478cd NM |
62 | struct omap_hwmod *oh; |
| 63 | struct device *dev; | |
| 64 | ||
| 65 | if (!opp_def->hwmod_name) { | |
| 66 | pr_err("%s: NULL name of omap_hwmod, failing [%d].\n", | |
| 67 | __func__, i); | |
| 68 | return -EINVAL; | |
| 69 | } | |
| 24d7b40a KH |
70 | |
| 71 | if (!strncmp(opp_def->hwmod_name, "mpu", 3)) { | |
| 72 | /* | |
| 73 | * All current OMAPs share voltage rail and | |
| 74 | * clock source, so CPU0 is used to represent | |
| 75 | * the MPU-SS. | |
| 76 | */ | |
| 77 | dev = get_cpu_device(0); | |
| 78 | } else { | |
| 79 | oh = omap_hwmod_lookup(opp_def->hwmod_name); | |
| 80 | if (!oh || !oh->od) { | |
| 81 | pr_debug("%s: no hwmod or odev for %s, [%d] cannot add OPPs.\n", | |
| 82 | __func__, opp_def->hwmod_name, i); | |
| 83 | continue; | |
| 84 | } | |
| 85 | dev = &oh->od->pdev->dev; | |
| fd1478cd | 86 | } |
| fd1478cd | 87 | |
| 5d4879cd | 88 | r = dev_pm_opp_add(dev, opp_def->freq, opp_def->u_volt); |
| fd1478cd | 89 | if (r) { |
| 7852ec05 PW |
90 | dev_err(dev, "%s: add OPP %ld failed for %s [%d] result=%d\n", |
| 91 | __func__, opp_def->freq, | |
| 92 | opp_def->hwmod_name, i, r); | |
| fd1478cd NM |
93 | } else { |
| 94 | if (!opp_def->default_available) | |
| 5d4879cd | 95 | r = dev_pm_opp_disable(dev, opp_def->freq); |
| fd1478cd | 96 | if (r) |
| 7852ec05 | 97 | dev_err(dev, "%s: disable %ld failed for %s [%d] result=%d\n", |
| fd1478cd NM |
98 | __func__, opp_def->freq, |
| 99 | opp_def->hwmod_name, i, r); | |
| 100 | } | |
| fd1478cd NM |
101 | } |
| 102 | ||
| 103 | return 0; | |
| 104 | } |