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/dma-mapping.h>
19 #include <linux/types.h>
20 #include <linux/qcom_scm.h>
22 #include <linux/of_platform.h>
23 #include <linux/clk.h>
30 struct clk
*iface_clk
;
34 static struct qcom_scm
*__scm
;
36 static int qcom_scm_clk_enable(void)
40 ret
= clk_prepare_enable(__scm
->core_clk
);
44 ret
= clk_prepare_enable(__scm
->iface_clk
);
48 ret
= clk_prepare_enable(__scm
->bus_clk
);
55 clk_disable_unprepare(__scm
->iface_clk
);
57 clk_disable_unprepare(__scm
->core_clk
);
62 static void qcom_scm_clk_disable(void)
64 clk_disable_unprepare(__scm
->core_clk
);
65 clk_disable_unprepare(__scm
->iface_clk
);
66 clk_disable_unprepare(__scm
->bus_clk
);
70 * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
71 * @entry: Entry point function for the cpus
72 * @cpus: The cpumask of cpus that will use the entry point
74 * Set the cold boot address of the cpus. Any cpu outside the supported
75 * range would be removed from the cpu present mask.
77 int qcom_scm_set_cold_boot_addr(void *entry
, const cpumask_t
*cpus
)
79 return __qcom_scm_set_cold_boot_addr(entry
, cpus
);
81 EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr
);
84 * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
85 * @entry: Entry point function for the cpus
86 * @cpus: The cpumask of cpus that will use the entry point
88 * Set the Linux entry point for the SCM to transfer control to when coming
89 * out of a power down. CPU power down may be executed on cpuidle or hotplug.
91 int qcom_scm_set_warm_boot_addr(void *entry
, const cpumask_t
*cpus
)
93 return __qcom_scm_set_warm_boot_addr(__scm
->dev
, entry
, cpus
);
95 EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr
);
98 * qcom_scm_cpu_power_down() - Power down the cpu
99 * @flags - Flags to flush cache
101 * This is an end point to power down cpu. If there was a pending interrupt,
102 * the control would return from this function, otherwise, the cpu jumps to the
103 * warm boot entry point set for this cpu upon reset.
105 void qcom_scm_cpu_power_down(u32 flags
)
107 __qcom_scm_cpu_power_down(flags
);
109 EXPORT_SYMBOL(qcom_scm_cpu_power_down
);
112 * qcom_scm_hdcp_available() - Check if secure environment supports HDCP.
114 * Return true if HDCP is supported, false if not.
116 bool qcom_scm_hdcp_available(void)
118 int ret
= qcom_scm_clk_enable();
123 ret
= __qcom_scm_is_call_available(__scm
->dev
, QCOM_SCM_SVC_HDCP
,
126 qcom_scm_clk_disable();
128 return ret
> 0 ? true : false;
130 EXPORT_SYMBOL(qcom_scm_hdcp_available
);
133 * qcom_scm_hdcp_req() - Send HDCP request.
134 * @req: HDCP request array
135 * @req_cnt: HDCP request array count
136 * @resp: response buffer passed to SCM
138 * Write HDCP register(s) through SCM.
140 int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req
*req
, u32 req_cnt
, u32
*resp
)
142 int ret
= qcom_scm_clk_enable();
147 ret
= __qcom_scm_hdcp_req(__scm
->dev
, req
, req_cnt
, resp
);
148 qcom_scm_clk_disable();
151 EXPORT_SYMBOL(qcom_scm_hdcp_req
);
154 * qcom_scm_pas_supported() - Check if the peripheral authentication service is
155 * available for the given peripherial
156 * @peripheral: peripheral id
158 * Returns true if PAS is supported for this peripheral, otherwise false.
160 bool qcom_scm_pas_supported(u32 peripheral
)
164 ret
= __qcom_scm_is_call_available(__scm
->dev
, QCOM_SCM_SVC_PIL
,
165 QCOM_SCM_PAS_IS_SUPPORTED_CMD
);
169 return __qcom_scm_pas_supported(__scm
->dev
, peripheral
);
171 EXPORT_SYMBOL(qcom_scm_pas_supported
);
174 * qcom_scm_pas_init_image() - Initialize peripheral authentication service
175 * state machine for a given peripheral, using the
177 * @peripheral: peripheral id
178 * @metadata: pointer to memory containing ELF header, program header table
179 * and optional blob of data used for authenticating the metadata
180 * and the rest of the firmware
181 * @size: size of the metadata
183 * Returns 0 on success.
185 int qcom_scm_pas_init_image(u32 peripheral
, const void *metadata
, size_t size
)
187 dma_addr_t mdata_phys
;
192 * During the scm call memory protection will be enabled for the meta
193 * data blob, so make sure it's physically contiguous, 4K aligned and
194 * non-cachable to avoid XPU violations.
196 mdata_buf
= dma_alloc_coherent(__scm
->dev
, size
, &mdata_phys
,
199 dev_err(__scm
->dev
, "Allocation of metadata buffer failed.\n");
202 memcpy(mdata_buf
, metadata
, size
);
204 ret
= qcom_scm_clk_enable();
208 ret
= __qcom_scm_pas_init_image(__scm
->dev
, peripheral
, mdata_phys
);
210 qcom_scm_clk_disable();
213 dma_free_coherent(__scm
->dev
, size
, mdata_buf
, mdata_phys
);
217 EXPORT_SYMBOL(qcom_scm_pas_init_image
);
220 * qcom_scm_pas_mem_setup() - Prepare the memory related to a given peripheral
221 * for firmware loading
222 * @peripheral: peripheral id
223 * @addr: start address of memory area to prepare
224 * @size: size of the memory area to prepare
226 * Returns 0 on success.
228 int qcom_scm_pas_mem_setup(u32 peripheral
, phys_addr_t addr
, phys_addr_t size
)
232 ret
= qcom_scm_clk_enable();
236 ret
= __qcom_scm_pas_mem_setup(__scm
->dev
, peripheral
, addr
, size
);
237 qcom_scm_clk_disable();
241 EXPORT_SYMBOL(qcom_scm_pas_mem_setup
);
244 * qcom_scm_pas_auth_and_reset() - Authenticate the given peripheral firmware
245 * and reset the remote processor
246 * @peripheral: peripheral id
248 * Return 0 on success.
250 int qcom_scm_pas_auth_and_reset(u32 peripheral
)
254 ret
= qcom_scm_clk_enable();
258 ret
= __qcom_scm_pas_auth_and_reset(__scm
->dev
, peripheral
);
259 qcom_scm_clk_disable();
263 EXPORT_SYMBOL(qcom_scm_pas_auth_and_reset
);
266 * qcom_scm_pas_shutdown() - Shut down the remote processor
267 * @peripheral: peripheral id
269 * Returns 0 on success.
271 int qcom_scm_pas_shutdown(u32 peripheral
)
275 ret
= qcom_scm_clk_enable();
279 ret
= __qcom_scm_pas_shutdown(__scm
->dev
, peripheral
);
280 qcom_scm_clk_disable();
284 EXPORT_SYMBOL(qcom_scm_pas_shutdown
);
286 static int qcom_scm_probe(struct platform_device
*pdev
)
288 struct qcom_scm
*scm
;
291 scm
= devm_kzalloc(&pdev
->dev
, sizeof(*scm
), GFP_KERNEL
);
295 scm
->core_clk
= devm_clk_get(&pdev
->dev
, "core");
296 if (IS_ERR(scm
->core_clk
)) {
297 if (PTR_ERR(scm
->core_clk
) == -EPROBE_DEFER
)
298 return PTR_ERR(scm
->core_clk
);
300 scm
->core_clk
= NULL
;
303 if (of_device_is_compatible(pdev
->dev
.of_node
, "qcom,scm")) {
304 scm
->iface_clk
= devm_clk_get(&pdev
->dev
, "iface");
305 if (IS_ERR(scm
->iface_clk
)) {
306 if (PTR_ERR(scm
->iface_clk
) != -EPROBE_DEFER
)
307 dev_err(&pdev
->dev
, "failed to acquire iface clk\n");
308 return PTR_ERR(scm
->iface_clk
);
311 scm
->bus_clk
= devm_clk_get(&pdev
->dev
, "bus");
312 if (IS_ERR(scm
->bus_clk
)) {
313 if (PTR_ERR(scm
->bus_clk
) != -EPROBE_DEFER
)
314 dev_err(&pdev
->dev
, "failed to acquire bus clk\n");
315 return PTR_ERR(scm
->bus_clk
);
319 /* vote for max clk rate for highest performance */
320 ret
= clk_set_rate(scm
->core_clk
, INT_MAX
);
325 __scm
->dev
= &pdev
->dev
;
332 static const struct of_device_id qcom_scm_dt_match
[] = {
333 { .compatible
= "qcom,scm-apq8064",},
334 { .compatible
= "qcom,scm-msm8660",},
335 { .compatible
= "qcom,scm-msm8960",},
336 { .compatible
= "qcom,scm",},
340 MODULE_DEVICE_TABLE(of
, qcom_scm_dt_match
);
342 static struct platform_driver qcom_scm_driver
= {
345 .of_match_table
= qcom_scm_dt_match
,
347 .probe
= qcom_scm_probe
,
350 static int __init
qcom_scm_init(void)
352 struct device_node
*np
, *fw_np
;
355 fw_np
= of_find_node_by_name(NULL
, "firmware");
360 np
= of_find_matching_node(fw_np
, qcom_scm_dt_match
);
369 ret
= of_platform_populate(fw_np
, qcom_scm_dt_match
, NULL
, NULL
);
376 return platform_driver_register(&qcom_scm_driver
);
379 arch_initcall(qcom_scm_init
);
381 static void __exit
qcom_scm_exit(void)
383 platform_driver_unregister(&qcom_scm_driver
);
385 module_exit(qcom_scm_exit
);
387 MODULE_DESCRIPTION("Qualcomm SCM driver");
388 MODULE_LICENSE("GPL v2");