| /* |
| * 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" |
| |
| 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); |
| } |