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.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #include <linux/slab.h>
21 #include <linux/module.h>
22 #include <linux/mutex.h>
23 #include <linux/errno.h>
24 #include <linux/err.h>
25 #include <linux/qcom_scm.h>
27 #include <asm/cacheflush.h>
31 #define QCOM_SCM_FLAG_COLDBOOT_CPU0 0x00
32 #define QCOM_SCM_FLAG_COLDBOOT_CPU1 0x01
33 #define QCOM_SCM_FLAG_COLDBOOT_CPU2 0x08
34 #define QCOM_SCM_FLAG_COLDBOOT_CPU3 0x20
36 #define QCOM_SCM_FLAG_WARMBOOT_CPU0 0x04
37 #define QCOM_SCM_FLAG_WARMBOOT_CPU1 0x02
38 #define QCOM_SCM_FLAG_WARMBOOT_CPU2 0x10
39 #define QCOM_SCM_FLAG_WARMBOOT_CPU3 0x40
41 struct qcom_scm_entry
{
46 static struct qcom_scm_entry qcom_scm_wb
[] = {
47 { .flag
= QCOM_SCM_FLAG_WARMBOOT_CPU0
},
48 { .flag
= QCOM_SCM_FLAG_WARMBOOT_CPU1
},
49 { .flag
= QCOM_SCM_FLAG_WARMBOOT_CPU2
},
50 { .flag
= QCOM_SCM_FLAG_WARMBOOT_CPU3
},
53 static DEFINE_MUTEX(qcom_scm_lock
);
56 * struct qcom_scm_command - one SCM command buffer
57 * @len: total available memory for command and response
58 * @buf_offset: start of command buffer
59 * @resp_hdr_offset: start of response buffer
60 * @id: command to be executed
61 * @buf: buffer returned from qcom_scm_get_command_buffer()
63 * An SCM command is laid out in memory as follows:
65 * ------------------- <--- struct qcom_scm_command
67 * ------------------- <--- qcom_scm_get_command_buffer()
69 * ------------------- <--- struct qcom_scm_response and
70 * | response header | qcom_scm_command_to_response()
71 * ------------------- <--- qcom_scm_get_response_buffer()
75 * There can be arbitrary padding between the headers and buffers so
76 * you should always use the appropriate qcom_scm_get_*_buffer() routines
77 * to access the buffers in a safe manner.
79 struct qcom_scm_command
{
82 __le32 resp_hdr_offset
;
88 * struct qcom_scm_response - one SCM response buffer
89 * @len: total available memory for response
90 * @buf_offset: start of response data relative to start of qcom_scm_response
91 * @is_complete: indicates if the command has finished processing
93 struct qcom_scm_response
{
100 * alloc_qcom_scm_command() - Allocate an SCM command
101 * @cmd_size: size of the command buffer
102 * @resp_size: size of the response buffer
104 * Allocate an SCM command, including enough room for the command
105 * and response headers as well as the command and response buffers.
107 * Returns a valid &qcom_scm_command on success or %NULL if the allocation fails.
109 static struct qcom_scm_command
*alloc_qcom_scm_command(size_t cmd_size
, size_t resp_size
)
111 struct qcom_scm_command
*cmd
;
112 size_t len
= sizeof(*cmd
) + sizeof(struct qcom_scm_response
) + cmd_size
+
116 cmd
= kzalloc(PAGE_ALIGN(len
), GFP_KERNEL
);
118 cmd
->len
= cpu_to_le32(len
);
119 offset
= offsetof(struct qcom_scm_command
, buf
);
120 cmd
->buf_offset
= cpu_to_le32(offset
);
121 cmd
->resp_hdr_offset
= cpu_to_le32(offset
+ cmd_size
);
127 * free_qcom_scm_command() - Free an SCM command
128 * @cmd: command to free
130 * Free an SCM command.
132 static inline void free_qcom_scm_command(struct qcom_scm_command
*cmd
)
138 * qcom_scm_command_to_response() - Get a pointer to a qcom_scm_response
141 * Returns a pointer to a response for a command.
143 static inline struct qcom_scm_response
*qcom_scm_command_to_response(
144 const struct qcom_scm_command
*cmd
)
146 return (void *)cmd
+ le32_to_cpu(cmd
->resp_hdr_offset
);
150 * qcom_scm_get_command_buffer() - Get a pointer to a command buffer
153 * Returns a pointer to the command buffer of a command.
155 static inline void *qcom_scm_get_command_buffer(const struct qcom_scm_command
*cmd
)
157 return (void *)cmd
->buf
;
161 * qcom_scm_get_response_buffer() - Get a pointer to a response buffer
164 * Returns a pointer to a response buffer of a response.
166 static inline void *qcom_scm_get_response_buffer(const struct qcom_scm_response
*rsp
)
168 return (void *)rsp
+ le32_to_cpu(rsp
->buf_offset
);
171 static u32
smc(u32 cmd_addr
)
174 register u32 r0
asm("r0") = 1;
175 register u32 r1
asm("r1") = (u32
)&context_id
;
176 register u32 r2
asm("r2") = cmd_addr
;
184 ".arch_extension sec\n"
186 "smc #0 @ switch to secure world\n"
188 : "r" (r0
), "r" (r1
), "r" (r2
)
190 } while (r0
== QCOM_SCM_INTERRUPTED
);
195 static int __qcom_scm_call(const struct qcom_scm_command
*cmd
)
198 u32 cmd_addr
= virt_to_phys(cmd
);
201 * Flush the command buffer so that the secure world sees
204 secure_flush_area(cmd
, cmd
->len
);
208 ret
= qcom_scm_remap_error(ret
);
213 static void qcom_scm_inv_range(unsigned long start
, unsigned long end
)
215 u32 cacheline_size
, ctr
;
217 asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr
));
218 cacheline_size
= 4 << ((ctr
>> 16) & 0xf);
220 start
= round_down(start
, cacheline_size
);
221 end
= round_up(end
, cacheline_size
);
222 outer_inv_range(start
, end
);
223 while (start
< end
) {
224 asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start
)
226 start
+= cacheline_size
;
233 * qcom_scm_call() - Send an SCM command
234 * @svc_id: service identifier
235 * @cmd_id: command identifier
236 * @cmd_buf: command buffer
237 * @cmd_len: length of the command buffer
238 * @resp_buf: response buffer
239 * @resp_len: length of the response buffer
241 * Sends a command to the SCM and waits for the command to finish processing.
243 * A note on cache maintenance:
244 * Note that any buffers that are expected to be accessed by the secure world
245 * must be flushed before invoking qcom_scm_call and invalidated in the cache
246 * immediately after qcom_scm_call returns. Cache maintenance on the command
247 * and response buffers is taken care of by qcom_scm_call; however, callers are
248 * responsible for any other cached buffers passed over to the secure world.
250 static int qcom_scm_call(u32 svc_id
, u32 cmd_id
, const void *cmd_buf
,
251 size_t cmd_len
, void *resp_buf
, size_t resp_len
)
254 struct qcom_scm_command
*cmd
;
255 struct qcom_scm_response
*rsp
;
256 unsigned long start
, end
;
258 cmd
= alloc_qcom_scm_command(cmd_len
, resp_len
);
262 cmd
->id
= cpu_to_le32((svc_id
<< 10) | cmd_id
);
264 memcpy(qcom_scm_get_command_buffer(cmd
), cmd_buf
, cmd_len
);
266 mutex_lock(&qcom_scm_lock
);
267 ret
= __qcom_scm_call(cmd
);
268 mutex_unlock(&qcom_scm_lock
);
272 rsp
= qcom_scm_command_to_response(cmd
);
273 start
= (unsigned long)rsp
;
276 qcom_scm_inv_range(start
, start
+ sizeof(*rsp
));
277 } while (!rsp
->is_complete
);
279 end
= (unsigned long)qcom_scm_get_response_buffer(rsp
) + resp_len
;
280 qcom_scm_inv_range(start
, end
);
283 memcpy(resp_buf
, qcom_scm_get_response_buffer(rsp
), resp_len
);
285 free_qcom_scm_command(cmd
);
289 #define SCM_CLASS_REGISTER (0x2 << 8)
290 #define SCM_MASK_IRQS BIT(5)
291 #define SCM_ATOMIC(svc, cmd, n) (((((svc) << 10)|((cmd) & 0x3ff)) << 12) | \
292 SCM_CLASS_REGISTER | \
297 * qcom_scm_call_atomic1() - Send an atomic SCM command with one argument
298 * @svc_id: service identifier
299 * @cmd_id: command identifier
300 * @arg1: first argument
302 * This shall only be used with commands that are guaranteed to be
303 * uninterruptable, atomic and SMP safe.
305 static s32
qcom_scm_call_atomic1(u32 svc
, u32 cmd
, u32 arg1
)
309 register u32 r0
asm("r0") = SCM_ATOMIC(svc
, cmd
, 1);
310 register u32 r1
asm("r1") = (u32
)&context_id
;
311 register u32 r2
asm("r2") = arg1
;
319 ".arch_extension sec\n"
321 "smc #0 @ switch to secure world\n"
323 : "r" (r0
), "r" (r1
), "r" (r2
)
328 u32
qcom_scm_get_version(void)
331 static u32 version
= -1;
332 register u32 r0
asm("r0");
333 register u32 r1
asm("r1");
338 mutex_lock(&qcom_scm_lock
);
341 r1
= (u32
)&context_id
;
349 ".arch_extension sec\n"
351 "smc #0 @ switch to secure world\n"
352 : "=r" (r0
), "=r" (r1
)
355 } while (r0
== QCOM_SCM_INTERRUPTED
);
358 mutex_unlock(&qcom_scm_lock
);
362 EXPORT_SYMBOL(qcom_scm_get_version
);
365 * Set the cold/warm boot address for one of the CPU cores.
367 static int qcom_scm_set_boot_addr(u32 addr
, int flags
)
374 cmd
.addr
= cpu_to_le32(addr
);
375 cmd
.flags
= cpu_to_le32(flags
);
376 return qcom_scm_call(QCOM_SCM_SVC_BOOT
, QCOM_SCM_BOOT_ADDR
,
377 &cmd
, sizeof(cmd
), NULL
, 0);
381 * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
382 * @entry: Entry point function for the cpus
383 * @cpus: The cpumask of cpus that will use the entry point
385 * Set the cold boot address of the cpus. Any cpu outside the supported
386 * range would be removed from the cpu present mask.
388 int __qcom_scm_set_cold_boot_addr(void *entry
, const cpumask_t
*cpus
)
392 int scm_cb_flags
[] = {
393 QCOM_SCM_FLAG_COLDBOOT_CPU0
,
394 QCOM_SCM_FLAG_COLDBOOT_CPU1
,
395 QCOM_SCM_FLAG_COLDBOOT_CPU2
,
396 QCOM_SCM_FLAG_COLDBOOT_CPU3
,
399 if (!cpus
|| (cpus
&& cpumask_empty(cpus
)))
402 for_each_cpu(cpu
, cpus
) {
403 if (cpu
< ARRAY_SIZE(scm_cb_flags
))
404 flags
|= scm_cb_flags
[cpu
];
406 set_cpu_present(cpu
, false);
409 return qcom_scm_set_boot_addr(virt_to_phys(entry
), flags
);
413 * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
414 * @entry: Entry point function for the cpus
415 * @cpus: The cpumask of cpus that will use the entry point
417 * Set the Linux entry point for the SCM to transfer control to when coming
418 * out of a power down. CPU power down may be executed on cpuidle or hotplug.
420 int __qcom_scm_set_warm_boot_addr(void *entry
, const cpumask_t
*cpus
)
427 * Reassign only if we are switching from hotplug entry point
428 * to cpuidle entry point or vice versa.
430 for_each_cpu(cpu
, cpus
) {
431 if (entry
== qcom_scm_wb
[cpu
].entry
)
433 flags
|= qcom_scm_wb
[cpu
].flag
;
436 /* No change in entry function */
440 ret
= qcom_scm_set_boot_addr(virt_to_phys(entry
), flags
);
442 for_each_cpu(cpu
, cpus
)
443 qcom_scm_wb
[cpu
].entry
= entry
;
450 * qcom_scm_cpu_power_down() - Power down the cpu
451 * @flags - Flags to flush cache
453 * This is an end point to power down cpu. If there was a pending interrupt,
454 * the control would return from this function, otherwise, the cpu jumps to the
455 * warm boot entry point set for this cpu upon reset.
457 void __qcom_scm_cpu_power_down(u32 flags
)
459 qcom_scm_call_atomic1(QCOM_SCM_SVC_BOOT
, QCOM_SCM_CMD_TERMINATE_PC
,
460 flags
& QCOM_SCM_FLUSH_FLAG_MASK
);
463 int __qcom_scm_is_call_available(u32 svc_id
, u32 cmd_id
)
466 __le32 svc_cmd
= cpu_to_le32((svc_id
<< 10) | cmd_id
);
469 ret
= qcom_scm_call(QCOM_SCM_SVC_INFO
, QCOM_IS_CALL_AVAIL_CMD
, &svc_cmd
,
470 sizeof(svc_cmd
), &ret_val
, sizeof(ret_val
));
474 return le32_to_cpu(ret_val
);
477 int __qcom_scm_hdcp_req(struct qcom_scm_hdcp_req
*req
, u32 req_cnt
, u32
*resp
)
479 if (req_cnt
> QCOM_SCM_HDCP_MAX_REQ_CNT
)
482 return qcom_scm_call(QCOM_SCM_SVC_HDCP
, QCOM_SCM_CMD_HDCP
,
483 req
, req_cnt
* sizeof(*req
), resp
, sizeof(*resp
));