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/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
* Copyright 2017 NXP
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/errno.h>
#include <soc/imx8/sc/sci.h>
#include "clk-imx8.h"
DEFINE_SPINLOCK(imx_ccm_lock);
sc_ipc_t ccm_ipc_handle;
int imx8_clk_mu_init(void)
{
uint32_t mu_id;
sc_err_t sciErr;
printk("MU and Power domains initialized\n");
sciErr = sc_ipc_getMuID(&mu_id);
if (sciErr != SC_ERR_NONE) {
pr_info("Cannot obtain MU ID\n");
return -EPROBE_DEFER;
}
sciErr = sc_ipc_open(&ccm_ipc_handle, mu_id);
if (sciErr != SC_ERR_NONE) {
pr_info("Cannot open MU channel to SCU\n");
return -EPROBE_DEFER;
}
return 0;
}
bool imx8_clk_is_resource_owned(sc_rsrc_t rsrc)
{
/*
* A-core resources are special. SCFW reports they are not "owned" by
* current partition but linux can still adjust them for cpufreq.
*
* So force this to return false when running as a VM guest and always
* true otherwise.
*/
if (rsrc == SC_R_A53 || rsrc == SC_R_A72 || rsrc == SC_R_A35) {
if (xen_domain() && !xen_initial_domain())
return false;
return true;
}
if (!ccm_ipc_handle) {
pr_warn("%s: no ipc handle!\n", __func__);
/* should have handled -EPROBE_DEFER from clk_mu_init earlier. */
return false;
}
return sc_rm_is_resource_owned(ccm_ipc_handle, rsrc);
}
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