msm: Secure Channel Manager (SCM) support (2a1eb58a) · Commits · 戴 / test

arch/arm/mach-msm/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -45,6 +45,7 @@ config ARCH_MSM8X60
		select MSM_V2_TLMM
		select MSM_GPIOMUX
		select IOMMU_API
		select MSM_SCM if SMP

		endchoice

		@@ -172,4 +173,7 @@ config MSM_V2_TLMM

		config IOMMU_API
		bool

		config MSM_SCM
		bool
		endif

arch/arm/mach-msm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@ obj-$(CONFIG_MSM_PROC_COMM) += clock.o
		obj-$(CONFIG_ARCH_QSD8X50) += sirc.o
		obj-$(CONFIG_MSM_SMD) += smd.o smd_debug.o
		obj-$(CONFIG_MSM_SMD) += last_radio_log.o
		obj-$(CONFIG_MSM_SCM) += scm.o

		obj-$(CONFIG_MACH_TROUT) += board-trout.o board-trout-gpio.o board-trout-mmc.o devices-msm7x00.o
		obj-$(CONFIG_MACH_TROUT) += board-trout.o board-trout-gpio.o board-trout-mmc.o board-trout-panel.o devices-msm7x00.o

arch/arm/mach-msm/scm.c

0 → 100644

+287 −0

Original line number	Diff line number	Diff line
		/* 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 <asm/cacheflush.h>

		#include "scm.h"

		/* Cache line size for msm8x60 */
		#define CACHELINESIZE 32

		#define SCM_ENOMEM -5
		#define SCM_EOPNOTSUPP -4
		#define SCM_EINVAL_ADDR -3
		#define SCM_EINVAL_ARG -2
		#define SCM_ERROR -1
		#define SCM_INTERRUPTED 1

		static DEFINE_MUTEX(scm_lock);

		/**
		* struct 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 scm_get_command_buffer()
		*
		* An SCM command is layed out in memory as follows:
		*
		* ------------------- <--- struct scm_command
		* \| command header \|
		* ------------------- <--- scm_get_command_buffer()
		* \| command buffer \|
		* ------------------- <--- struct scm_response and
		* \| response header \| scm_command_to_response()
		* ------------------- <--- scm_get_response_buffer()
		* \| response buffer \|
		* -------------------
		*
		* There can be arbitrary padding between the headers and buffers so
		* you should always use the appropriate scm_get_*_buffer() routines
		* to access the buffers in a safe manner.
		*/
		struct scm_command {
		u32 len;
		u32 buf_offset;
		u32 resp_hdr_offset;
		u32 id;
		u32 buf[0];
		};

		/**
		* struct scm_response - one SCM response buffer
		* @len: total available memory for response
		* @buf_offset: start of response data relative to start of scm_response
		* @is_complete: indicates if the command has finished processing
		*/
		struct scm_response {
		u32 len;
		u32 buf_offset;
		u32 is_complete;
		};

		/**
		* alloc_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 &scm_command on success or %NULL if the allocation fails.
		*/
		static struct scm_command *alloc_scm_command(size_t cmd_size, size_t resp_size)
		{
		struct scm_command *cmd;
		size_t len = sizeof(*cmd) + sizeof(struct scm_response) + cmd_size +
		resp_size;

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

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

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

		/**
		* 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 scm_get_command_buffer(const struct scm_command cmd)
		{
		return (void *)cmd->buf;
		}

		/**
		* 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 scm_get_response_buffer(const struct scm_response rsp)
		{
		return (void *)rsp + rsp->buf_offset;
		}

		static int scm_remap_error(int err)
		{
		switch (err) {
		case SCM_ERROR:
		return -EIO;
		case SCM_EINVAL_ADDR:
		case SCM_EINVAL_ARG:
		return -EINVAL;
		case SCM_EOPNOTSUPP:
		return -EOPNOTSUPP;
		case 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;
		asm(
		__asmeq("%0", "r0")
		__asmeq("%1", "r0")
		__asmeq("%2", "r1")
		__asmeq("%3", "r2")
		"smc #0 @ switch to secure world\n"
		: "=r" (r0)
		: "r" (r0), "r" (r1), "r" (r2)
		: "r3");
		return r0;
		}

		static int __scm_call(const struct scm_command *cmd)
		{
		int ret;
		u32 cmd_addr = virt_to_phys(cmd);

		/*
		* Flush the entire cache here so callers don't have to remember
		* to flush the cache when passing physical addresses to the secure
		* side in the buffer.
		*/
		flush_cache_all();
		do {
		ret = smc(cmd_addr);
		if (ret < 0) {
		ret = scm_remap_error(ret);
		break;
		}
		} while (ret == SCM_INTERRUPTED);

		return ret;
		}

		/**
		* 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.
		*/
		int 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 scm_command *cmd;
		struct scm_response *rsp;

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

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

		mutex_lock(&scm_lock);
		ret = __scm_call(cmd);
		mutex_unlock(&scm_lock);
		if (ret)
		goto out;

		rsp = scm_command_to_response(cmd);
		do {
		u32 start = (u32)rsp;
		u32 end = (u32)scm_get_response_buffer(rsp) + resp_len;
		start &= ~(CACHELINESIZE - 1);
		while (start < end) {
		asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
		: "memory");
		start += CACHELINESIZE;
		}
		} while (!rsp->is_complete);

		if (resp_buf)
		memcpy(resp_buf, scm_get_response_buffer(rsp), resp_len);
		out:
		free_scm_command(cmd);
		return ret;
		}
		EXPORT_SYMBOL(scm_call);

		u32 scm_get_version(void)
		{
		int context_id;
		static u32 version = -1;
		register u32 r0 asm("r0") = 0x1 << 8;
		register u32 r1 asm("r1") = (u32)&context_id;

		if (version != -1)
		return version;

		mutex_lock(&scm_lock);
		asm(
		__asmeq("%0", "r1")
		__asmeq("%1", "r0")
		__asmeq("%2", "r1")
		"smc #0 @ switch to secure world\n"
		: "=r" (r1)
		: "r" (r0), "r" (r1)
		: "r2", "r3");
		version = r1;
		mutex_unlock(&scm_lock);

		return version;
		}
		EXPORT_SYMBOL(scm_get_version);

arch/arm/mach-msm/scm.h

0 → 100644

+41 −0

Original line number	Diff line number	Diff line
		/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
		*
		* Redistribution and use in source and binary forms, with or without
		* modification, are permitted provided that the following conditions are
		* met:
		* * Redistributions of source code must retain the above copyright
		* notice, this list of conditions and the following disclaimer.
		* * Redistributions in binary form must reproduce the above
		* copyright notice, this list of conditions and the following
		* disclaimer in the documentation and/or other materials provided
		* with the distribution.
		* * Neither the name of Code Aurora Forum, Inc. nor the names of its
		* contributors may be used to endorse or promote products derived
		* from this software without specific prior written permission.
		*
		* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
		* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
		* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
		* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
		* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
		* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
		* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
		* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
		* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
		* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
		* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		*/
		#ifndef __MACH_SCM_H
		#define __MACH_SCM_H

		#define SCM_SVC_BOOT 0x1
		#define SCM_SVC_PIL 0x2

		extern int scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf, size_t cmd_len,
		void *resp_buf, size_t resp_len);

		#define SCM_VERSION(major, minor) (((major) << 16) \| ((minor) & 0xFF))

		extern u32 scm_get_version(void);

		#endif

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