[deliverable/linux.git] / drivers / firmware / qcom_scm.c

/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <linux/slab.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/qcom_scm.h>

#include <asm/outercache.h>
#include <asm/cacheflush.h>


#define QCOM_SCM_ENOMEM		-5
#define QCOM_SCM_EOPNOTSUPP	-4
#define QCOM_SCM_EINVAL_ADDR	-3
#define QCOM_SCM_EINVAL_ARG	-2
#define QCOM_SCM_ERROR		-1
#define QCOM_SCM_INTERRUPTED	1

static DEFINE_MUTEX(qcom_scm_lock);

/**
 * struct qcom_scm_command - one SCM command buffer
 * @len: total available memory for command and response
 * @buf_offset: start of command buffer
 * @resp_hdr_offset: start of response buffer
 * @id: command to be executed
 * @buf: buffer returned from qcom_scm_get_command_buffer()
 *
 * An SCM command is laid out in memory as follows:
 *
 *	------------------- <--- struct qcom_scm_command
 *	| command header  |
 *	------------------- <--- qcom_scm_get_command_buffer()
 *	| command buffer  |
 *	------------------- <--- struct qcom_scm_response and
 *	| response header |      qcom_scm_command_to_response()
 *	------------------- <--- qcom_scm_get_response_buffer()
 *	| response buffer |
 *	-------------------
 *
 * There can be arbitrary padding between the headers and buffers so
 * you should always use the appropriate qcom_scm_get_*_buffer() routines
 * to access the buffers in a safe manner.
 */
struct qcom_scm_command {
	__le32 len;
	__le32 buf_offset;
	__le32 resp_hdr_offset;
	__le32 id;
	__le32 buf[0];
};

/**
 * struct qcom_scm_response - one SCM response buffer
 * @len: total available memory for response
 * @buf_offset: start of response data relative to start of qcom_scm_response
 * @is_complete: indicates if the command has finished processing
 */
struct qcom_scm_response {
	__le32 len;
	__le32 buf_offset;
	__le32 is_complete;
};

/**
 * alloc_qcom_scm_command() - Allocate an SCM command
 * @cmd_size: size of the command buffer
 * @resp_size: size of the response buffer
 *
 * Allocate an SCM command, including enough room for the command
 * and response headers as well as the command and response buffers.
 *
 * Returns a valid &qcom_scm_command on success or %NULL if the allocation fails.
 */
static struct qcom_scm_command *alloc_qcom_scm_command(size_t cmd_size, size_t resp_size)
{
	struct qcom_scm_command *cmd;
	size_t len = sizeof(*cmd) + sizeof(struct qcom_scm_response) + cmd_size +
		resp_size;
	u32 offset;

	cmd = kzalloc(PAGE_ALIGN(len), GFP_KERNEL);
	if (cmd) {
		cmd->len = cpu_to_le32(len);
		offset = offsetof(struct qcom_scm_command, buf);
		cmd->buf_offset = cpu_to_le32(offset);
		cmd->resp_hdr_offset = cpu_to_le32(offset + cmd_size);
	}
	return cmd;
}

/**
 * free_qcom_scm_command() - Free an SCM command
 * @cmd: command to free
 *
 * Free an SCM command.
 */
static inline void free_qcom_scm_command(struct qcom_scm_command *cmd)
{
	kfree(cmd);
}

/**
 * qcom_scm_command_to_response() - Get a pointer to a qcom_scm_response
 * @cmd: command
 *
 * Returns a pointer to a response for a command.
 */
static inline struct qcom_scm_response *qcom_scm_command_to_response(
		const struct qcom_scm_command *cmd)
{
	return (void *)cmd + le32_to_cpu(cmd->resp_hdr_offset);
}

/**
 * qcom_scm_get_command_buffer() - Get a pointer to a command buffer
 * @cmd: command
 *
 * Returns a pointer to the command buffer of a command.
 */
static inline void *qcom_scm_get_command_buffer(const struct qcom_scm_command *cmd)
{
	return (void *)cmd->buf;
}

/**
 * qcom_scm_get_response_buffer() - Get a pointer to a response buffer
 * @rsp: response
 *
 * Returns a pointer to a response buffer of a response.
 */
static inline void *qcom_scm_get_response_buffer(const struct qcom_scm_response *rsp)
{
	return (void *)rsp + le32_to_cpu(rsp->buf_offset);
}

static int qcom_scm_remap_error(int err)
{
	pr_err("qcom_scm_call failed with error code %d\n", err);
	switch (err) {
	case QCOM_SCM_ERROR:
		return -EIO;
	case QCOM_SCM_EINVAL_ADDR:
	case QCOM_SCM_EINVAL_ARG:
		return -EINVAL;
	case QCOM_SCM_EOPNOTSUPP:
		return -EOPNOTSUPP;
	case QCOM_SCM_ENOMEM:
		return -ENOMEM;
	}
	return -EINVAL;
}

static u32 smc(u32 cmd_addr)
{
	int context_id;
	register u32 r0 asm("r0") = 1;
	register u32 r1 asm("r1") = (u32)&context_id;
	register u32 r2 asm("r2") = cmd_addr;
	do {
		asm volatile(
			__asmeq("%0", "r0")
			__asmeq("%1", "r0")
			__asmeq("%2", "r1")
			__asmeq("%3", "r2")
#ifdef REQUIRES_SEC
			".arch_extension sec\n"
#endif
			"smc	#0	@ switch to secure world\n"
			: "=r" (r0)
			: "r" (r0), "r" (r1), "r" (r2)
			: "r3");
	} while (r0 == QCOM_SCM_INTERRUPTED);

	return r0;
}

static int __qcom_scm_call(const struct qcom_scm_command *cmd)
{
	int ret;
	u32 cmd_addr = virt_to_phys(cmd);

	/*
	 * Flush the command buffer so that the secure world sees
	 * the correct data.
	 */
	__cpuc_flush_dcache_area((void *)cmd, cmd->len);
	outer_flush_range(cmd_addr, cmd_addr + cmd->len);

	ret = smc(cmd_addr);
	if (ret < 0)
		ret = qcom_scm_remap_error(ret);

	return ret;
}

static void qcom_scm_inv_range(unsigned long start, unsigned long end)
{
	u32 cacheline_size, ctr;

	asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
	cacheline_size = 4 << ((ctr >> 16) & 0xf);

	start = round_down(start, cacheline_size);
	end = round_up(end, cacheline_size);
	outer_inv_range(start, end);
	while (start < end) {
		asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
		     : "memory");
		start += cacheline_size;
	}
	dsb();
	isb();
}

/**
 * qcom_scm_call() - Send an SCM command
 * @svc_id: service identifier
 * @cmd_id: command identifier
 * @cmd_buf: command buffer
 * @cmd_len: length of the command buffer
 * @resp_buf: response buffer
 * @resp_len: length of the response buffer
 *
 * Sends a command to the SCM and waits for the command to finish processing.
 *
 * A note on cache maintenance:
 * Note that any buffers that are expected to be accessed by the secure world
 * must be flushed before invoking qcom_scm_call and invalidated in the cache
 * immediately after qcom_scm_call returns. Cache maintenance on the command
 * and response buffers is taken care of by qcom_scm_call; however, callers are
 * responsible for any other cached buffers passed over to the secure world.
 */
static int qcom_scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf,
			size_t cmd_len, void *resp_buf, size_t resp_len)
{
	int ret;
	struct qcom_scm_command *cmd;
	struct qcom_scm_response *rsp;
	unsigned long start, end;

	cmd = alloc_qcom_scm_command(cmd_len, resp_len);
	if (!cmd)
		return -ENOMEM;

	cmd->id = cpu_to_le32((svc_id << 10) | cmd_id);
	if (cmd_buf)
		memcpy(qcom_scm_get_command_buffer(cmd), cmd_buf, cmd_len);

	mutex_lock(&qcom_scm_lock);
	ret = __qcom_scm_call(cmd);
	mutex_unlock(&qcom_scm_lock);
	if (ret)
		goto out;

	rsp = qcom_scm_command_to_response(cmd);
	start = (unsigned long)rsp;

	do {
		qcom_scm_inv_range(start, start + sizeof(*rsp));
	} while (!rsp->is_complete);

	end = (unsigned long)qcom_scm_get_response_buffer(rsp) + resp_len;
	qcom_scm_inv_range(start, end);

	if (resp_buf)
		memcpy(resp_buf, qcom_scm_get_response_buffer(rsp), resp_len);
out:
	free_qcom_scm_command(cmd);
	return ret;
}

u32 qcom_scm_get_version(void)
{
	int context_id;
	static u32 version = -1;
	register u32 r0 asm("r0");
	register u32 r1 asm("r1");

	if (version != -1)
		return version;

	mutex_lock(&qcom_scm_lock);

	r0 = 0x1 << 8;
	r1 = (u32)&context_id;
	do {
		asm volatile(
			__asmeq("%0", "r0")
			__asmeq("%1", "r1")
			__asmeq("%2", "r0")
			__asmeq("%3", "r1")
#ifdef REQUIRES_SEC
			".arch_extension sec\n"
#endif
			"smc	#0	@ switch to secure world\n"
			: "=r" (r0), "=r" (r1)
			: "r" (r0), "r" (r1)
			: "r2", "r3");
	} while (r0 == QCOM_SCM_INTERRUPTED);

	version = r1;
	mutex_unlock(&qcom_scm_lock);

	return version;
}
EXPORT_SYMBOL(qcom_scm_get_version);

#define QCOM_SCM_SVC_BOOT			0x1
#define QCOM_SCM_BOOT_ADDR			0x1
/*
 * Set the cold/warm boot address for one of the CPU cores.
 */
int qcom_scm_set_boot_addr(u32 addr, int flags)
{
	struct {
		__le32 flags;
		__le32 addr;
	} cmd;

	cmd.addr = cpu_to_le32(addr);
	cmd.flags = cpu_to_le32(flags);
	return qcom_scm_call(QCOM_SCM_SVC_BOOT, QCOM_SCM_BOOT_ADDR,
			&cmd, sizeof(cmd), NULL, 0);
}
EXPORT_SYMBOL(qcom_scm_set_boot_addr);
Commit	Line	Data
2a1eb58a SB	1	/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*
	12	* You should have received a copy of the GNU General Public License
	13	* along with this program; if not, write to the Free Software
	14	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	15	* 02110-1301, USA.
	16	*/
	17
	18	#include <linux/slab.h>
	19	#include <linux/io.h>
	20	#include <linux/module.h>
	21	#include <linux/mutex.h>
	22	#include <linux/errno.h>
	23	#include <linux/err.h>
916f743d	24	#include <linux/qcom_scm.h>
2a1eb58a	25
f76c6916	26	#include <asm/outercache.h>
2a1eb58a SB	27	#include <asm/cacheflush.h>
2a1eb58a SB	28
2a1eb58a	29
4de43476 KG	30	#define QCOM_SCM_ENOMEM -5
	31	#define QCOM_SCM_EOPNOTSUPP -4
	32	#define QCOM_SCM_EINVAL_ADDR -3
	33	#define QCOM_SCM_EINVAL_ARG -2
	34	#define QCOM_SCM_ERROR -1
	35	#define QCOM_SCM_INTERRUPTED 1
2a1eb58a	36
4de43476	37	static DEFINE_MUTEX(qcom_scm_lock);
2a1eb58a SB	38
2a1eb58a SB	39	/**
4de43476	40	* struct qcom_scm_command - one SCM command buffer
2a1eb58a SB	41	* @len: total available memory for command and response
	42	* @buf_offset: start of command buffer
	43	* @resp_hdr_offset: start of response buffer
	44	* @id: command to be executed
4de43476	45	* @buf: buffer returned from qcom_scm_get_command_buffer()
2a1eb58a	46	*
25985edc	47	* An SCM command is laid out in memory as follows:
2a1eb58a	48	*
4de43476	49	* ------------------- <--- struct qcom_scm_command
2a1eb58a	50	* \| command header \|
4de43476	51	* ------------------- <--- qcom_scm_get_command_buffer()
2a1eb58a	52	* \| command buffer \|
4de43476 KG	53	* ------------------- <--- struct qcom_scm_response and
	54	* \| response header \| qcom_scm_command_to_response()
	55	* ------------------- <--- qcom_scm_get_response_buffer()
2a1eb58a SB	56	* \| response buffer \|
	57	* -------------------
	58	*
	59	* There can be arbitrary padding between the headers and buffers so
4de43476	60	* you should always use the appropriate qcom_scm_get_*_buffer() routines
2a1eb58a SB	61	* to access the buffers in a safe manner.
2a1eb58a SB	62	*/
4de43476	63	struct qcom_scm_command {
7279db92 SB	64	__le32 len;
	65	__le32 buf_offset;
	66	__le32 resp_hdr_offset;
	67	__le32 id;
	68	__le32 buf[0];
2a1eb58a SB	69	};
	70
	71	/**
4de43476	72	* struct qcom_scm_response - one SCM response buffer
2a1eb58a	73	* @len: total available memory for response
4de43476	74	* @buf_offset: start of response data relative to start of qcom_scm_response
2a1eb58a SB	75	* @is_complete: indicates if the command has finished processing
2a1eb58a SB	76	*/
4de43476	77	struct qcom_scm_response {
7279db92 SB	78	__le32 len;
	79	__le32 buf_offset;
	80	__le32 is_complete;
2a1eb58a SB	81	};
	82
	83	/**
4de43476	84	* alloc_qcom_scm_command() - Allocate an SCM command
2a1eb58a SB	85	* @cmd_size: size of the command buffer
	86	* @resp_size: size of the response buffer
	87	*
	88	* Allocate an SCM command, including enough room for the command
	89	* and response headers as well as the command and response buffers.
	90	*
4de43476	91	* Returns a valid &qcom_scm_command on success or %NULL if the allocation fails.
2a1eb58a	92	*/
4de43476	93	static struct qcom_scm_command *alloc_qcom_scm_command(size_t cmd_size, size_t resp_size)
2a1eb58a	94	{
4de43476 KG	95	struct qcom_scm_command *cmd;
4de43476 KG	96	size_t len = sizeof(*cmd) + sizeof(struct qcom_scm_response) + cmd_size +
2a1eb58a	97	resp_size;
7279db92	98	u32 offset;
2a1eb58a SB	99
	100	cmd = kzalloc(PAGE_ALIGN(len), GFP_KERNEL);
	101	if (cmd) {
7279db92	102	cmd->len = cpu_to_le32(len);
4de43476	103	offset = offsetof(struct qcom_scm_command, buf);
7279db92 SB	104	cmd->buf_offset = cpu_to_le32(offset);
7279db92 SB	105	cmd->resp_hdr_offset = cpu_to_le32(offset + cmd_size);
2a1eb58a SB	106	}
	107	return cmd;
	108	}
	109
	110	/**
4de43476	111	* free_qcom_scm_command() - Free an SCM command
2a1eb58a SB	112	* @cmd: command to free
	113	*
	114	* Free an SCM command.
	115	*/
4de43476	116	static inline void free_qcom_scm_command(struct qcom_scm_command *cmd)
2a1eb58a SB	117	{
	118	kfree(cmd);
	119	}
	120
	121	/**
4de43476	122	* qcom_scm_command_to_response() - Get a pointer to a qcom_scm_response
2a1eb58a SB	123	* @cmd: command
	124	*
	125	* Returns a pointer to a response for a command.
	126	*/
4de43476 KG	127	static inline struct qcom_scm_response *qcom_scm_command_to_response(
4de43476 KG	128	const struct qcom_scm_command *cmd)
2a1eb58a	129	{
7279db92	130	return (void *)cmd + le32_to_cpu(cmd->resp_hdr_offset);
2a1eb58a SB	131	}
	132
	133	/**
4de43476	134	* qcom_scm_get_command_buffer() - Get a pointer to a command buffer
2a1eb58a SB	135	* @cmd: command
	136	*
	137	* Returns a pointer to the command buffer of a command.
	138	*/
4de43476	139	static inline void qcom_scm_get_command_buffer(const struct qcom_scm_command cmd)
2a1eb58a SB	140	{
	141	return (void *)cmd->buf;
	142	}
	143
	144	/**
4de43476	145	* qcom_scm_get_response_buffer() - Get a pointer to a response buffer
2a1eb58a SB	146	* @rsp: response
	147	*
	148	* Returns a pointer to a response buffer of a response.
	149	*/
4de43476	150	static inline void qcom_scm_get_response_buffer(const struct qcom_scm_response rsp)
2a1eb58a	151	{
7279db92	152	return (void *)rsp + le32_to_cpu(rsp->buf_offset);
2a1eb58a SB	153	}
2a1eb58a SB	154
4de43476	155	static int qcom_scm_remap_error(int err)
2a1eb58a	156	{
4de43476	157	pr_err("qcom_scm_call failed with error code %d\n", err);
2a1eb58a	158	switch (err) {
4de43476	159	case QCOM_SCM_ERROR:
2a1eb58a	160	return -EIO;
4de43476 KG	161	case QCOM_SCM_EINVAL_ADDR:
4de43476 KG	162	case QCOM_SCM_EINVAL_ARG:
2a1eb58a	163	return -EINVAL;
4de43476	164	case QCOM_SCM_EOPNOTSUPP:
2a1eb58a	165	return -EOPNOTSUPP;
4de43476	166	case QCOM_SCM_ENOMEM:
2a1eb58a SB	167	return -ENOMEM;
	168	}
	169	return -EINVAL;
	170	}
	171
	172	static u32 smc(u32 cmd_addr)
	173	{
	174	int context_id;
	175	register u32 r0 asm("r0") = 1;
	176	register u32 r1 asm("r1") = (u32)&context_id;
	177	register u32 r2 asm("r2") = cmd_addr;
8e76a809 SB	178	do {
	179	asm volatile(
	180	__asmeq("%0", "r0")
	181	__asmeq("%1", "r0")
	182	__asmeq("%2", "r1")
	183	__asmeq("%3", "r2")
eca55f4d MZ	184	#ifdef REQUIRES_SEC
	185	".arch_extension sec\n"
	186	#endif
8e76a809 SB	187	"smc #0 @ switch to secure world\n"
	188	: "=r" (r0)
	189	: "r" (r0), "r" (r1), "r" (r2)
	190	: "r3");
4de43476	191	} while (r0 == QCOM_SCM_INTERRUPTED);
8e76a809	192
2a1eb58a SB	193	return r0;
	194	}
	195
4de43476	196	static int __qcom_scm_call(const struct qcom_scm_command *cmd)
2a1eb58a SB	197	{
	198	int ret;
	199	u32 cmd_addr = virt_to_phys(cmd);
	200
	201	/*
404b5a97 VM	202	* Flush the command buffer so that the secure world sees
404b5a97 VM	203	* the correct data.
2a1eb58a	204	*/
404b5a97 VM	205	__cpuc_flush_dcache_area((void *)cmd, cmd->len);
	206	outer_flush_range(cmd_addr, cmd_addr + cmd->len);
	207
8e76a809 SB	208	ret = smc(cmd_addr);
8e76a809 SB	209	if (ret < 0)
4de43476	210	ret = qcom_scm_remap_error(ret);
2a1eb58a SB	211
	212	return ret;
	213	}
	214
4de43476	215	static void qcom_scm_inv_range(unsigned long start, unsigned long end)
f76c6916	216	{
30cbb0c0 SB	217	u32 cacheline_size, ctr;
	218
	219	asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
	220	cacheline_size = 4 << ((ctr >> 16) & 0xf);
	221
	222	start = round_down(start, cacheline_size);
	223	end = round_up(end, cacheline_size);
f76c6916 SB	224	outer_inv_range(start, end);
	225	while (start < end) {
	226	asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
	227	: "memory");
30cbb0c0	228	start += cacheline_size;
f76c6916 SB	229	}
	230	dsb();
	231	isb();
	232	}
	233
2a1eb58a	234	/**
4de43476	235	* qcom_scm_call() - Send an SCM command
2a1eb58a SB	236	* @svc_id: service identifier
	237	* @cmd_id: command identifier
	238	* @cmd_buf: command buffer
	239	* @cmd_len: length of the command buffer
	240	* @resp_buf: response buffer
	241	* @resp_len: length of the response buffer
	242	*
	243	* Sends a command to the SCM and waits for the command to finish processing.
404b5a97 VM	244	*
	245	* A note on cache maintenance:
	246	* Note that any buffers that are expected to be accessed by the secure world
4de43476 KG	247	* must be flushed before invoking qcom_scm_call and invalidated in the cache
	248	* immediately after qcom_scm_call returns. Cache maintenance on the command
	249	* and response buffers is taken care of by qcom_scm_call; however, callers are
404b5a97	250	* responsible for any other cached buffers passed over to the secure world.
2a1eb58a	251	*/
4de43476 KG	252	static int qcom_scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf,
4de43476 KG	253	size_t cmd_len, void *resp_buf, size_t resp_len)
2a1eb58a SB	254	{
2a1eb58a SB	255	int ret;
4de43476 KG	256	struct qcom_scm_command *cmd;
4de43476 KG	257	struct qcom_scm_response *rsp;
f76c6916	258	unsigned long start, end;
2a1eb58a	259
4de43476	260	cmd = alloc_qcom_scm_command(cmd_len, resp_len);
2a1eb58a SB	261	if (!cmd)
	262	return -ENOMEM;
	263
7279db92	264	cmd->id = cpu_to_le32((svc_id << 10) \| cmd_id);
2a1eb58a	265	if (cmd_buf)
4de43476	266	memcpy(qcom_scm_get_command_buffer(cmd), cmd_buf, cmd_len);
2a1eb58a	267
4de43476 KG	268	mutex_lock(&qcom_scm_lock);
	269	ret = __qcom_scm_call(cmd);
	270	mutex_unlock(&qcom_scm_lock);
2a1eb58a SB	271	if (ret)
	272	goto out;
	273
4de43476	274	rsp = qcom_scm_command_to_response(cmd);
f76c6916 SB	275	start = (unsigned long)rsp;
f76c6916 SB	276
2a1eb58a	277	do {
4de43476	278	qcom_scm_inv_range(start, start + sizeof(*rsp));
2a1eb58a SB	279	} while (!rsp->is_complete);
2a1eb58a SB	280
4de43476 KG	281	end = (unsigned long)qcom_scm_get_response_buffer(rsp) + resp_len;
4de43476 KG	282	qcom_scm_inv_range(start, end);
f76c6916	283
2a1eb58a	284	if (resp_buf)
4de43476	285	memcpy(resp_buf, qcom_scm_get_response_buffer(rsp), resp_len);
2a1eb58a	286	out:
4de43476	287	free_qcom_scm_command(cmd);
2a1eb58a SB	288	return ret;
2a1eb58a SB	289	}
2a1eb58a	290
4de43476	291	u32 qcom_scm_get_version(void)
2a1eb58a SB	292	{
	293	int context_id;
	294	static u32 version = -1;
98d4ded6 SB	295	register u32 r0 asm("r0");
98d4ded6 SB	296	register u32 r1 asm("r1");
2a1eb58a SB	297
	298	if (version != -1)
	299	return version;
	300
4de43476	301	mutex_lock(&qcom_scm_lock);
98d4ded6 SB	302
	303	r0 = 0x1 << 8;
	304	r1 = (u32)&context_id;
8e76a809 SB	305	do {
	306	asm volatile(
	307	__asmeq("%0", "r0")
	308	__asmeq("%1", "r1")
	309	__asmeq("%2", "r0")
	310	__asmeq("%3", "r1")
26e87b13 SB	311	#ifdef REQUIRES_SEC
	312	".arch_extension sec\n"
	313	#endif
8e76a809 SB	314	"smc #0 @ switch to secure world\n"
	315	: "=r" (r0), "=r" (r1)
	316	: "r" (r0), "r" (r1)
	317	: "r2", "r3");
4de43476	318	} while (r0 == QCOM_SCM_INTERRUPTED);
8e76a809	319
2a1eb58a	320	version = r1;
4de43476	321	mutex_unlock(&qcom_scm_lock);
2a1eb58a SB	322
	323	return version;
	324	}
4de43476	325	EXPORT_SYMBOL(qcom_scm_get_version);
3d9b448b	326
4de43476 KG	327	#define QCOM_SCM_SVC_BOOT 0x1
4de43476 KG	328	#define QCOM_SCM_BOOT_ADDR 0x1
3d9b448b KG	329	/*
	330	* Set the cold/warm boot address for one of the CPU cores.
	331	*/
4de43476	332	int qcom_scm_set_boot_addr(u32 addr, int flags)
3d9b448b KG	333	{
	334	struct {
	335	__le32 flags;
	336	__le32 addr;
	337	} cmd;
	338
	339	cmd.addr = cpu_to_le32(addr);
	340	cmd.flags = cpu_to_le32(flags);
4de43476	341	return qcom_scm_call(QCOM_SCM_SVC_BOOT, QCOM_SCM_BOOT_ADDR,
3d9b448b KG	342	&cmd, sizeof(cmd), NULL, 0);
3d9b448b KG	343	}
4de43476	344	EXPORT_SYMBOL(qcom_scm_set_boot_addr);