1 /* Copyright (c) 2010,2015, The Linux Foundation. All rights reserved.
2 * Copyright (C) 2015 Linaro Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/platform_device.h>
15 #include <linux/module.h>
16 #include <linux/cpumask.h>
17 #include <linux/export.h>
18 #include <linux/types.h>
19 #include <linux/qcom_scm.h>
21 #include <linux/of_platform.h>
22 #include <linux/clk.h>
29 struct clk *iface_clk;
33 static struct qcom_scm *__scm;
35 static int qcom_scm_clk_enable(void)
39 ret = clk_prepare_enable(__scm->core_clk);
43 ret = clk_prepare_enable(__scm->iface_clk);
47 ret = clk_prepare_enable(__scm->bus_clk);
54 clk_disable_unprepare(__scm->iface_clk);
56 clk_disable_unprepare(__scm->core_clk);
61 static void qcom_scm_clk_disable(void)
63 clk_disable_unprepare(__scm->core_clk);
64 clk_disable_unprepare(__scm->iface_clk);
65 clk_disable_unprepare(__scm->bus_clk);
69 * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
70 * @entry: Entry point function for the cpus
71 * @cpus: The cpumask of cpus that will use the entry point
73 * Set the cold boot address of the cpus. Any cpu outside the supported
74 * range would be removed from the cpu present mask.
76 int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
78 return __qcom_scm_set_cold_boot_addr(entry, cpus);
80 EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);
83 * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
84 * @entry: Entry point function for the cpus
85 * @cpus: The cpumask of cpus that will use the entry point
87 * Set the Linux entry point for the SCM to transfer control to when coming
88 * out of a power down. CPU power down may be executed on cpuidle or hotplug.
90 int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus)
92 return __qcom_scm_set_warm_boot_addr(__scm->dev, entry, cpus);
94 EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
97 * qcom_scm_cpu_power_down() - Power down the cpu
98 * @flags - Flags to flush cache
100 * This is an end point to power down cpu. If there was a pending interrupt,
101 * the control would return from this function, otherwise, the cpu jumps to the
102 * warm boot entry point set for this cpu upon reset.
104 void qcom_scm_cpu_power_down(u32 flags)
106 __qcom_scm_cpu_power_down(flags);
108 EXPORT_SYMBOL(qcom_scm_cpu_power_down);
111 * qcom_scm_hdcp_available() - Check if secure environment supports HDCP.
113 * Return true if HDCP is supported, false if not.
115 bool qcom_scm_hdcp_available(void)
117 int ret = qcom_scm_clk_enable();
122 ret = __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_HDCP,
125 qcom_scm_clk_disable();
127 return ret > 0 ? true : false;
129 EXPORT_SYMBOL(qcom_scm_hdcp_available);
132 * qcom_scm_hdcp_req() - Send HDCP request.
133 * @req: HDCP request array
134 * @req_cnt: HDCP request array count
135 * @resp: response buffer passed to SCM
137 * Write HDCP register(s) through SCM.
139 int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
141 int ret = qcom_scm_clk_enable();
146 ret = __qcom_scm_hdcp_req(__scm->dev, req, req_cnt, resp);
147 qcom_scm_clk_disable();
150 EXPORT_SYMBOL(qcom_scm_hdcp_req);
152 static int qcom_scm_probe(struct platform_device *pdev)
154 struct qcom_scm *scm;
157 scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
161 scm->core_clk = devm_clk_get(&pdev->dev, "core");
162 if (IS_ERR(scm->core_clk)) {
163 if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
164 return PTR_ERR(scm->core_clk);
166 scm->core_clk = NULL;
169 if (of_device_is_compatible(pdev->dev.of_node, "qcom,scm")) {
170 scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
171 if (IS_ERR(scm->iface_clk)) {
172 if (PTR_ERR(scm->iface_clk) != -EPROBE_DEFER)
173 dev_err(&pdev->dev, "failed to acquire iface clk\n");
174 return PTR_ERR(scm->iface_clk);
177 scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
178 if (IS_ERR(scm->bus_clk)) {
179 if (PTR_ERR(scm->bus_clk) != -EPROBE_DEFER)
180 dev_err(&pdev->dev, "failed to acquire bus clk\n");
181 return PTR_ERR(scm->bus_clk);
185 /* vote for max clk rate for highest performance */
186 ret = clk_set_rate(scm->core_clk, INT_MAX);
191 __scm->dev = &pdev->dev;
196 static const struct of_device_id qcom_scm_dt_match[] = {
197 { .compatible = "qcom,scm-apq8064",},
198 { .compatible = "qcom,scm-msm8660",},
199 { .compatible = "qcom,scm-msm8960",},
200 { .compatible = "qcom,scm",},
204 MODULE_DEVICE_TABLE(of, qcom_scm_dt_match);
206 static struct platform_driver qcom_scm_driver = {
209 .of_match_table = qcom_scm_dt_match,
211 .probe = qcom_scm_probe,
214 static int __init qcom_scm_init(void)
216 struct device_node *np, *fw_np;
219 fw_np = of_find_node_by_name(NULL, "firmware");
224 np = of_find_matching_node(fw_np, qcom_scm_dt_match);
233 ret = of_platform_populate(fw_np, qcom_scm_dt_match, NULL, NULL);
240 return platform_driver_register(&qcom_scm_driver);
243 arch_initcall(qcom_scm_init);
245 static void __exit qcom_scm_exit(void)
247 platform_driver_unregister(&qcom_scm_driver);
249 module_exit(qcom_scm_exit);
251 MODULE_DESCRIPTION("Qualcomm SCM driver");
252 MODULE_LICENSE("GPL v2");