105 строки
2.8 KiB
C
105 строки
2.8 KiB
C
/*
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* OMAP SoC specific OPP wrapper function
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated - http://www.ti.com/
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* Nishanth Menon
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* Kevin Hilman
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* Copyright (C) 2010 Nokia Corporation.
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* Eduardo Valentin
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pm_opp.h>
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#include <linux/cpu.h>
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#include "omap_device.h"
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#include "omap_opp_data.h"
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/* Temp variable to allow multiple calls */
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static u8 __initdata omap_table_init;
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/**
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* omap_init_opp_table() - Initialize opp table as per the CPU type
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* @opp_def: opp default list for this silicon
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* @opp_def_size: number of opp entries for this silicon
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*
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* Register the initial OPP table with the OPP library based on the CPU
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* type. This is meant to be used only by SoC specific registration.
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*/
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int __init omap_init_opp_table(struct omap_opp_def *opp_def,
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u32 opp_def_size)
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{
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int i, r;
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if (of_have_populated_dt())
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return -EINVAL;
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if (!opp_def || !opp_def_size) {
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pr_err("%s: invalid params!\n", __func__);
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return -EINVAL;
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}
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/*
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* Initialize only if not already initialized even if the previous
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* call failed, because, no reason we'd succeed again.
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*/
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if (omap_table_init)
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return -EEXIST;
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omap_table_init = 1;
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/* Lets now register with OPP library */
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for (i = 0; i < opp_def_size; i++, opp_def++) {
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struct omap_hwmod *oh;
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struct device *dev;
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if (!opp_def->hwmod_name) {
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pr_err("%s: NULL name of omap_hwmod, failing [%d].\n",
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__func__, i);
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return -EINVAL;
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}
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if (!strncmp(opp_def->hwmod_name, "mpu", 3)) {
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/*
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* All current OMAPs share voltage rail and
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* clock source, so CPU0 is used to represent
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* the MPU-SS.
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*/
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dev = get_cpu_device(0);
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} else {
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oh = omap_hwmod_lookup(opp_def->hwmod_name);
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if (!oh || !oh->od) {
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pr_debug("%s: no hwmod or odev for %s, [%d] cannot add OPPs.\n",
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__func__, opp_def->hwmod_name, i);
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continue;
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}
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dev = &oh->od->pdev->dev;
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}
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r = dev_pm_opp_add(dev, opp_def->freq, opp_def->u_volt);
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if (r) {
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dev_err(dev, "%s: add OPP %ld failed for %s [%d] result=%d\n",
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__func__, opp_def->freq,
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opp_def->hwmod_name, i, r);
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} else {
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if (!opp_def->default_available)
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r = dev_pm_opp_disable(dev, opp_def->freq);
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if (r)
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dev_err(dev, "%s: disable %ld failed for %s [%d] result=%d\n",
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__func__, opp_def->freq,
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opp_def->hwmod_name, i, r);
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}
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}
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return 0;
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}
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