1 files changed, 299 insertions, 0 deletions

diff --git a/arch/arm/mach-qcom/scm.c b/arch/arm/mach-qcom/scm.c
new file mode 100644
index 000000000000..c536fd6bf827
--- /dev/null
+++ b/arch/arm/mach-qcom/scm.c
@@ -0,0 +1,299 @@
+/* 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 laid 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;
+        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 == SCM_INTERRUPTED);
+
+        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();
+        ret = smc(cmd_addr);
+        if (ret < 0)
+                ret = scm_remap_error(ret);
+
+        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");
+        register u32 r1 asm("r1");
+
+        if (version != -1)
+                return version;
+
+        mutex_lock(&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 == SCM_INTERRUPTED);
+
+        version = r1;
+        mutex_unlock(&scm_lock);
+
+        return version;
+}
+EXPORT_SYMBOL(scm_get_version);