[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

#define QCOM_SCM_FLAG_COLDBOOT_CPU0	0x00
#define QCOM_SCM_FLAG_COLDBOOT_CPU1	0x01
#define QCOM_SCM_FLAG_COLDBOOT_CPU2	0x08
#define QCOM_SCM_FLAG_COLDBOOT_CPU3	0x20

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.
 */
static 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);
}

/**
 * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
 * @entry: Entry point function for the cpus
 * @cpus: The cpumask of cpus that will use the entry point
 *
 * Set the cold boot address of the cpus. Any cpu outside the supported
 * range would be removed from the cpu present mask.
 */
int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
{
	int flags = 0;
	int cpu;
	int scm_cb_flags[] = {
		QCOM_SCM_FLAG_COLDBOOT_CPU0,
		QCOM_SCM_FLAG_COLDBOOT_CPU1,
		QCOM_SCM_FLAG_COLDBOOT_CPU2,
		QCOM_SCM_FLAG_COLDBOOT_CPU3,
	};

	if (!cpus || (cpus && cpumask_empty(cpus)))
		return -EINVAL;

	for_each_cpu(cpu, cpus) {
		if (cpu < ARRAY_SIZE(scm_cb_flags))
			flags |= scm_cb_flags[cpu];
		else
			set_cpu_present(cpu, false);
	}

	return qcom_scm_set_boot_addr(virt_to_phys(entry), flags);
}
EXPORT_SYMBOL(qcom_scm_set_cold_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
a353e4a0 LI	37	#define QCOM_SCM_FLAG_COLDBOOT_CPU0 0x00
	38	#define QCOM_SCM_FLAG_COLDBOOT_CPU1 0x01
	39	#define QCOM_SCM_FLAG_COLDBOOT_CPU2 0x08
	40	#define QCOM_SCM_FLAG_COLDBOOT_CPU3 0x20
	41
4de43476	42	static DEFINE_MUTEX(qcom_scm_lock);
2a1eb58a SB	43
2a1eb58a SB	44	/**
4de43476	45	* struct qcom_scm_command - one SCM command buffer
2a1eb58a SB	46	* @len: total available memory for command and response
	47	* @buf_offset: start of command buffer
	48	* @resp_hdr_offset: start of response buffer
	49	* @id: command to be executed
4de43476	50	* @buf: buffer returned from qcom_scm_get_command_buffer()
2a1eb58a	51	*
25985edc	52	* An SCM command is laid out in memory as follows:
2a1eb58a	53	*
4de43476	54	* ------------------- <--- struct qcom_scm_command
2a1eb58a	55	* \| command header \|
4de43476	56	* ------------------- <--- qcom_scm_get_command_buffer()
2a1eb58a	57	* \| command buffer \|
4de43476 KG	58	* ------------------- <--- struct qcom_scm_response and
	59	* \| response header \| qcom_scm_command_to_response()
	60	* ------------------- <--- qcom_scm_get_response_buffer()
2a1eb58a SB	61	* \| response buffer \|
	62	* -------------------
	63	*
	64	* There can be arbitrary padding between the headers and buffers so
4de43476	65	* you should always use the appropriate qcom_scm_get_*_buffer() routines
2a1eb58a SB	66	* to access the buffers in a safe manner.
2a1eb58a SB	67	*/
4de43476	68	struct qcom_scm_command {
7279db92 SB	69	__le32 len;
	70	__le32 buf_offset;
	71	__le32 resp_hdr_offset;
	72	__le32 id;
	73	__le32 buf[0];
2a1eb58a SB	74	};
	75
	76	/**
4de43476	77	* struct qcom_scm_response - one SCM response buffer
2a1eb58a	78	* @len: total available memory for response
4de43476	79	* @buf_offset: start of response data relative to start of qcom_scm_response
2a1eb58a SB	80	* @is_complete: indicates if the command has finished processing
2a1eb58a SB	81	*/
4de43476	82	struct qcom_scm_response {
7279db92 SB	83	__le32 len;
	84	__le32 buf_offset;
	85	__le32 is_complete;
2a1eb58a SB	86	};
	87
	88	/**
4de43476	89	* alloc_qcom_scm_command() - Allocate an SCM command
2a1eb58a SB	90	* @cmd_size: size of the command buffer
	91	* @resp_size: size of the response buffer
	92	*
	93	* Allocate an SCM command, including enough room for the command
	94	* and response headers as well as the command and response buffers.
	95	*
4de43476	96	* Returns a valid &qcom_scm_command on success or %NULL if the allocation fails.
2a1eb58a	97	*/
4de43476	98	static struct qcom_scm_command *alloc_qcom_scm_command(size_t cmd_size, size_t resp_size)
2a1eb58a	99	{
4de43476 KG	100	struct qcom_scm_command *cmd;
4de43476 KG	101	size_t len = sizeof(*cmd) + sizeof(struct qcom_scm_response) + cmd_size +
2a1eb58a	102	resp_size;
7279db92	103	u32 offset;
2a1eb58a SB	104
	105	cmd = kzalloc(PAGE_ALIGN(len), GFP_KERNEL);
	106	if (cmd) {
7279db92	107	cmd->len = cpu_to_le32(len);
4de43476	108	offset = offsetof(struct qcom_scm_command, buf);
7279db92 SB	109	cmd->buf_offset = cpu_to_le32(offset);
7279db92 SB	110	cmd->resp_hdr_offset = cpu_to_le32(offset + cmd_size);
2a1eb58a SB	111	}
	112	return cmd;
	113	}
	114
	115	/**
4de43476	116	* free_qcom_scm_command() - Free an SCM command
2a1eb58a SB	117	* @cmd: command to free
	118	*
	119	* Free an SCM command.
	120	*/
4de43476	121	static inline void free_qcom_scm_command(struct qcom_scm_command *cmd)
2a1eb58a SB	122	{
	123	kfree(cmd);
	124	}
	125
	126	/**
4de43476	127	* qcom_scm_command_to_response() - Get a pointer to a qcom_scm_response
2a1eb58a SB	128	* @cmd: command
	129	*
	130	* Returns a pointer to a response for a command.
	131	*/
4de43476 KG	132	static inline struct qcom_scm_response *qcom_scm_command_to_response(
4de43476 KG	133	const struct qcom_scm_command *cmd)
2a1eb58a	134	{
7279db92	135	return (void *)cmd + le32_to_cpu(cmd->resp_hdr_offset);
2a1eb58a SB	136	}
	137
	138	/**
4de43476	139	* qcom_scm_get_command_buffer() - Get a pointer to a command buffer
2a1eb58a SB	140	* @cmd: command
	141	*
	142	* Returns a pointer to the command buffer of a command.
	143	*/
4de43476	144	static inline void qcom_scm_get_command_buffer(const struct qcom_scm_command cmd)
2a1eb58a SB	145	{
	146	return (void *)cmd->buf;
	147	}
	148
	149	/**
4de43476	150	* qcom_scm_get_response_buffer() - Get a pointer to a response buffer
2a1eb58a SB	151	* @rsp: response
	152	*
	153	* Returns a pointer to a response buffer of a response.
	154	*/
4de43476	155	static inline void qcom_scm_get_response_buffer(const struct qcom_scm_response rsp)
2a1eb58a	156	{
7279db92	157	return (void *)rsp + le32_to_cpu(rsp->buf_offset);
2a1eb58a SB	158	}
2a1eb58a SB	159
4de43476	160	static int qcom_scm_remap_error(int err)
2a1eb58a	161	{
4de43476	162	pr_err("qcom_scm_call failed with error code %d\n", err);
2a1eb58a	163	switch (err) {
4de43476	164	case QCOM_SCM_ERROR:
2a1eb58a	165	return -EIO;
4de43476 KG	166	case QCOM_SCM_EINVAL_ADDR:
4de43476 KG	167	case QCOM_SCM_EINVAL_ARG:
2a1eb58a	168	return -EINVAL;
4de43476	169	case QCOM_SCM_EOPNOTSUPP:
2a1eb58a	170	return -EOPNOTSUPP;
4de43476	171	case QCOM_SCM_ENOMEM:
2a1eb58a SB	172	return -ENOMEM;
	173	}
	174	return -EINVAL;
	175	}
	176
	177	static u32 smc(u32 cmd_addr)
	178	{
	179	int context_id;
	180	register u32 r0 asm("r0") = 1;
	181	register u32 r1 asm("r1") = (u32)&context_id;
	182	register u32 r2 asm("r2") = cmd_addr;
8e76a809 SB	183	do {
	184	asm volatile(
	185	__asmeq("%0", "r0")
	186	__asmeq("%1", "r0")
	187	__asmeq("%2", "r1")
	188	__asmeq("%3", "r2")
eca55f4d MZ	189	#ifdef REQUIRES_SEC
	190	".arch_extension sec\n"
	191	#endif
8e76a809 SB	192	"smc #0 @ switch to secure world\n"
	193	: "=r" (r0)
	194	: "r" (r0), "r" (r1), "r" (r2)
	195	: "r3");
4de43476	196	} while (r0 == QCOM_SCM_INTERRUPTED);
8e76a809	197
2a1eb58a SB	198	return r0;
	199	}
	200
4de43476	201	static int __qcom_scm_call(const struct qcom_scm_command *cmd)
2a1eb58a SB	202	{
	203	int ret;
	204	u32 cmd_addr = virt_to_phys(cmd);
	205
	206	/*
404b5a97 VM	207	* Flush the command buffer so that the secure world sees
404b5a97 VM	208	* the correct data.
2a1eb58a	209	*/
404b5a97 VM	210	__cpuc_flush_dcache_area((void *)cmd, cmd->len);
	211	outer_flush_range(cmd_addr, cmd_addr + cmd->len);
	212
8e76a809 SB	213	ret = smc(cmd_addr);
8e76a809 SB	214	if (ret < 0)
4de43476	215	ret = qcom_scm_remap_error(ret);
2a1eb58a SB	216
	217	return ret;
	218	}
	219
4de43476	220	static void qcom_scm_inv_range(unsigned long start, unsigned long end)
f76c6916	221	{
30cbb0c0 SB	222	u32 cacheline_size, ctr;
	223
	224	asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
	225	cacheline_size = 4 << ((ctr >> 16) & 0xf);
	226
	227	start = round_down(start, cacheline_size);
	228	end = round_up(end, cacheline_size);
f76c6916 SB	229	outer_inv_range(start, end);
	230	while (start < end) {
	231	asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
	232	: "memory");
30cbb0c0	233	start += cacheline_size;
f76c6916 SB	234	}
	235	dsb();
	236	isb();
	237	}
	238
2a1eb58a	239	/**
4de43476	240	* qcom_scm_call() - Send an SCM command
2a1eb58a SB	241	* @svc_id: service identifier
	242	* @cmd_id: command identifier
	243	* @cmd_buf: command buffer
	244	* @cmd_len: length of the command buffer
	245	* @resp_buf: response buffer
	246	* @resp_len: length of the response buffer
	247	*
	248	* Sends a command to the SCM and waits for the command to finish processing.
404b5a97 VM	249	*
	250	* A note on cache maintenance:
	251	* Note that any buffers that are expected to be accessed by the secure world
4de43476 KG	252	* must be flushed before invoking qcom_scm_call and invalidated in the cache
	253	* immediately after qcom_scm_call returns. Cache maintenance on the command
	254	* and response buffers is taken care of by qcom_scm_call; however, callers are
404b5a97	255	* responsible for any other cached buffers passed over to the secure world.
2a1eb58a	256	*/
4de43476 KG	257	static int qcom_scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf,
4de43476 KG	258	size_t cmd_len, void *resp_buf, size_t resp_len)
2a1eb58a SB	259	{
2a1eb58a SB	260	int ret;
4de43476 KG	261	struct qcom_scm_command *cmd;
4de43476 KG	262	struct qcom_scm_response *rsp;
f76c6916	263	unsigned long start, end;
2a1eb58a	264
4de43476	265	cmd = alloc_qcom_scm_command(cmd_len, resp_len);
2a1eb58a SB	266	if (!cmd)
	267	return -ENOMEM;
	268
7279db92	269	cmd->id = cpu_to_le32((svc_id << 10) \| cmd_id);
2a1eb58a	270	if (cmd_buf)
4de43476	271	memcpy(qcom_scm_get_command_buffer(cmd), cmd_buf, cmd_len);
2a1eb58a	272
4de43476 KG	273	mutex_lock(&qcom_scm_lock);
	274	ret = __qcom_scm_call(cmd);
	275	mutex_unlock(&qcom_scm_lock);
2a1eb58a SB	276	if (ret)
	277	goto out;
	278
4de43476	279	rsp = qcom_scm_command_to_response(cmd);
f76c6916 SB	280	start = (unsigned long)rsp;
f76c6916 SB	281
2a1eb58a	282	do {
4de43476	283	qcom_scm_inv_range(start, start + sizeof(*rsp));
2a1eb58a SB	284	} while (!rsp->is_complete);
2a1eb58a SB	285
4de43476 KG	286	end = (unsigned long)qcom_scm_get_response_buffer(rsp) + resp_len;
4de43476 KG	287	qcom_scm_inv_range(start, end);
f76c6916	288
2a1eb58a	289	if (resp_buf)
4de43476	290	memcpy(resp_buf, qcom_scm_get_response_buffer(rsp), resp_len);
2a1eb58a	291	out:
4de43476	292	free_qcom_scm_command(cmd);
2a1eb58a SB	293	return ret;
2a1eb58a SB	294	}
2a1eb58a	295
4de43476	296	u32 qcom_scm_get_version(void)
2a1eb58a SB	297	{
	298	int context_id;
	299	static u32 version = -1;
98d4ded6 SB	300	register u32 r0 asm("r0");
98d4ded6 SB	301	register u32 r1 asm("r1");
2a1eb58a SB	302
	303	if (version != -1)
	304	return version;
	305
4de43476	306	mutex_lock(&qcom_scm_lock);
98d4ded6 SB	307
	308	r0 = 0x1 << 8;
	309	r1 = (u32)&context_id;
8e76a809 SB	310	do {
	311	asm volatile(
	312	__asmeq("%0", "r0")
	313	__asmeq("%1", "r1")
	314	__asmeq("%2", "r0")
	315	__asmeq("%3", "r1")
26e87b13 SB	316	#ifdef REQUIRES_SEC
	317	".arch_extension sec\n"
	318	#endif
8e76a809 SB	319	"smc #0 @ switch to secure world\n"
	320	: "=r" (r0), "=r" (r1)
	321	: "r" (r0), "r" (r1)
	322	: "r2", "r3");
4de43476	323	} while (r0 == QCOM_SCM_INTERRUPTED);
8e76a809	324
2a1eb58a	325	version = r1;
4de43476	326	mutex_unlock(&qcom_scm_lock);
2a1eb58a SB	327
	328	return version;
	329	}
4de43476	330	EXPORT_SYMBOL(qcom_scm_get_version);
3d9b448b	331
4de43476 KG	332	#define QCOM_SCM_SVC_BOOT 0x1
4de43476 KG	333	#define QCOM_SCM_BOOT_ADDR 0x1
3d9b448b KG	334	/*
	335	* Set the cold/warm boot address for one of the CPU cores.
	336	*/
a353e4a0	337	static int qcom_scm_set_boot_addr(u32 addr, int flags)
3d9b448b KG	338	{
	339	struct {
	340	__le32 flags;
	341	__le32 addr;
	342	} cmd;
	343
	344	cmd.addr = cpu_to_le32(addr);
	345	cmd.flags = cpu_to_le32(flags);
4de43476	346	return qcom_scm_call(QCOM_SCM_SVC_BOOT, QCOM_SCM_BOOT_ADDR,
3d9b448b KG	347	&cmd, sizeof(cmd), NULL, 0);
3d9b448b KG	348	}
a353e4a0 LI	349
	350	/**
	351	* qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
	352	* @entry: Entry point function for the cpus
	353	* @cpus: The cpumask of cpus that will use the entry point
	354	*
	355	* Set the cold boot address of the cpus. Any cpu outside the supported
	356	* range would be removed from the cpu present mask.
	357	*/
	358	int qcom_scm_set_cold_boot_addr(void entry, const cpumask_t cpus)
	359	{
	360	int flags = 0;
	361	int cpu;
	362	int scm_cb_flags[] = {
	363	QCOM_SCM_FLAG_COLDBOOT_CPU0,
	364	QCOM_SCM_FLAG_COLDBOOT_CPU1,
	365	QCOM_SCM_FLAG_COLDBOOT_CPU2,
	366	QCOM_SCM_FLAG_COLDBOOT_CPU3,
	367	};
	368
	369	if (!cpus \|\| (cpus && cpumask_empty(cpus)))
	370	return -EINVAL;
	371
	372	for_each_cpu(cpu, cpus) {
	373	if (cpu < ARRAY_SIZE(scm_cb_flags))
	374	flags \|= scm_cb_flags[cpu];
	375	else
	376	set_cpu_present(cpu, false);
	377	}
	378
	379	return qcom_scm_set_boot_addr(virt_to_phys(entry), flags);
	380	}
	381	EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);