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|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018-2020 Linaro Limited
*/
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <log.h>
#include <malloc.h>
#include <tee.h>
#include <linux/arm-smccc.h>
#include <linux/err.h>
#include <linux/io.h>
#include <tee/optee_service.h>
#include "optee_smc.h"
#include "optee_msg.h"
#include "optee_private.h"
#define PAGELIST_ENTRIES_PER_PAGE \
((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
/*
* PTA_DEVICE_ENUM interface exposed by OP-TEE to discover enumerated services
*/
#define PTA_DEVICE_ENUM { 0x7011a688, 0xddde, 0x4053, \
{ 0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8 } }
/*
* PTA_CMD_GET_DEVICES - List services without supplicant dependencies
*
* [out] memref[0]: List of the UUIDs of service enumerated by OP-TEE
*/
#define PTA_CMD_GET_DEVICES 0x0
/*
* PTA_CMD_GET_DEVICES_SUPP - List services depending on tee supplicant
*
* [out] memref[0]: List of the UUIDs of service enumerated by OP-TEE
*/
#define PTA_CMD_GET_DEVICES_SUPP 0x1
typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long,
struct arm_smccc_res *);
struct optee_pdata {
optee_invoke_fn *invoke_fn;
};
struct rpc_param {
u32 a0;
u32 a1;
u32 a2;
u32 a3;
u32 a4;
u32 a5;
u32 a6;
u32 a7;
};
static struct optee_service *find_service_driver(const struct tee_optee_ta_uuid *uuid)
{
struct optee_service *service;
u8 loc_uuid[TEE_UUID_LEN];
size_t service_cnt, idx;
service_cnt = ll_entry_count(struct optee_service, optee_service);
service = ll_entry_start(struct optee_service, optee_service);
for (idx = 0; idx < service_cnt; idx++, service++) {
tee_optee_ta_uuid_to_octets(loc_uuid, &service->uuid);
if (!memcmp(uuid, loc_uuid, sizeof(*uuid)))
return service;
}
return NULL;
}
static int bind_service_list(struct udevice *dev, struct tee_shm *service_list, size_t count)
{
const struct tee_optee_ta_uuid *service_uuid = (const void *)service_list->addr;
struct optee_service *service;
size_t idx;
int ret;
for (idx = 0; idx < count; idx++) {
service = find_service_driver(service_uuid + idx);
if (!service)
continue;
ret = device_bind_driver_to_node(dev, service->driver_name, service->driver_name,
dev_ofnode(dev), NULL);
if (ret) {
dev_warn(dev, "%s was not bound: %d, ignored\n", service->driver_name, ret);
continue;
}
}
return 0;
}
static int __enum_services(struct udevice *dev, struct tee_shm *shm, size_t *shm_size, u32 tee_sess,
unsigned int pta_cmd)
{
struct tee_invoke_arg arg = { };
struct tee_param param = { };
int ret = 0;
arg.func = pta_cmd;
arg.session = tee_sess;
/* Fill invoke cmd params */
param.attr = TEE_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
param.u.memref.shm = shm;
param.u.memref.size = *shm_size;
ret = tee_invoke_func(dev, &arg, 1, ¶m);
if (ret || (arg.ret && arg.ret != TEE_ERROR_SHORT_BUFFER)) {
dev_err(dev, "Enumeration command 0x%x failed: 0x%x\n", pta_cmd, arg.ret);
return -EINVAL;
}
*shm_size = param.u.memref.size;
return 0;
}
static int enum_services(struct udevice *dev, struct tee_shm **shm, size_t *count, u32 tee_sess,
unsigned int pta_cmd)
{
size_t shm_size = 0;
int ret;
ret = __enum_services(dev, NULL, &shm_size, tee_sess, pta_cmd);
if (ret)
return ret;
ret = tee_shm_alloc(dev, shm_size, 0, shm);
if (ret) {
dev_err(dev, "Failed to allocated shared memory: %d\n", ret);
return ret;
}
ret = __enum_services(dev, *shm, &shm_size, tee_sess, pta_cmd);
if (!ret)
*count = shm_size / sizeof(struct tee_optee_ta_uuid);
return ret;
}
static int open_enum_session(struct udevice *dev, u32 *tee_sess)
{
const struct tee_optee_ta_uuid pta_uuid = PTA_DEVICE_ENUM;
struct tee_open_session_arg arg = { };
int ret;
tee_optee_ta_uuid_to_octets(arg.uuid, &pta_uuid);
ret = tee_open_session(dev, &arg, 0, NULL);
if (ret || arg.ret) {
if (!ret)
ret = -EIO;
return ret;
}
*tee_sess = arg.session;
return 0;
}
static int bind_service_drivers(struct udevice *dev)
{
struct tee_shm *service_list = NULL;
size_t service_count;
u32 tee_sess;
int ret, ret2;
ret = open_enum_session(dev, &tee_sess);
if (ret)
return ret;
ret = enum_services(dev, &service_list, &service_count, tee_sess,
PTA_CMD_GET_DEVICES);
if (!ret)
ret = bind_service_list(dev, service_list, service_count);
tee_shm_free(service_list);
ret2 = enum_services(dev, &service_list, &service_count, tee_sess,
PTA_CMD_GET_DEVICES_SUPP);
if (!ret2)
ret2 = bind_service_list(dev, service_list, service_count);
tee_shm_free(service_list);
tee_close_session(dev, tee_sess);
if (ret)
return ret;
return ret2;
}
/**
* reg_pair_to_ptr() - Make a pointer of 2 32-bit values
* @reg0: High bits of the pointer
* @reg1: Low bits of the pointer
*
* Returns the combined result, note that if a pointer is 32-bit wide @reg0
* will be discarded.
*/
static void *reg_pair_to_ptr(u32 reg0, u32 reg1)
{
return (void *)(ulong)(((u64)reg0 << 32) | reg1);
}
/**
* reg_pair_from_64() - Split a 64-bit value into two 32-bit values
* @reg0: High bits of @val
* @reg1: Low bits of @val
* @val: The value to split
*/
static void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
{
*reg0 = val >> 32;
*reg1 = val;
}
/**
* optee_alloc_and_init_page_list() - Provide page list of memory buffer
* @buf: Start of buffer
* @len: Length of buffer
* @phys_buf_ptr Physical pointer with coded offset to page list
*
* Secure world doesn't share mapping with Normal world (U-Boot in this case)
* so physical pointers are needed when sharing pointers.
*
* Returns a pointer page list on success or NULL on failure
*/
void *optee_alloc_and_init_page_list(void *buf, ulong len, u64 *phys_buf_ptr)
{
const unsigned int page_size = OPTEE_MSG_NONCONTIG_PAGE_SIZE;
const phys_addr_t page_mask = page_size - 1;
u8 *buf_base;
unsigned int page_offset;
unsigned int num_pages;
unsigned int list_size;
unsigned int n;
void *page_list;
struct {
u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
u64 next_page_data;
} *pages_data;
/*
* A Memory buffer is described in chunks of 4k. The list of
* physical addresses has to be represented by a physical pointer
* too and a single list has to start at a 4k page and fit into
* that page. In order to be able to describe large memory buffers
* these 4k pages carrying physical addresses are linked together
* in a list. See OPTEE_MSG_ATTR_NONCONTIG in
* drivers/tee/optee/optee_msg.h for more information.
*/
page_offset = (ulong)buf & page_mask;
num_pages = roundup(page_offset + len, page_size) / page_size;
list_size = DIV_ROUND_UP(num_pages, PAGELIST_ENTRIES_PER_PAGE) *
page_size;
page_list = memalign(page_size, list_size);
if (!page_list)
return NULL;
pages_data = page_list;
buf_base = (u8 *)rounddown((ulong)buf, page_size);
n = 0;
while (num_pages) {
pages_data->pages_list[n] = virt_to_phys(buf_base);
n++;
buf_base += page_size;
num_pages--;
if (n == PAGELIST_ENTRIES_PER_PAGE) {
pages_data->next_page_data =
virt_to_phys(pages_data + 1);
pages_data++;
n = 0;
}
}
*phys_buf_ptr = virt_to_phys(page_list) | page_offset;
return page_list;
}
static void optee_get_version(struct udevice *dev,
struct tee_version_data *vers)
{
struct tee_version_data v = {
.gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM,
};
*vers = v;
}
static int get_msg_arg(struct udevice *dev, uint num_params,
struct tee_shm **shmp, struct optee_msg_arg **msg_arg)
{
int rc;
struct optee_msg_arg *ma;
rc = __tee_shm_add(dev, OPTEE_MSG_NONCONTIG_PAGE_SIZE, NULL,
OPTEE_MSG_GET_ARG_SIZE(num_params), TEE_SHM_ALLOC,
shmp);
if (rc)
return rc;
ma = (*shmp)->addr;
memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
ma->num_params = num_params;
*msg_arg = ma;
return 0;
}
static int to_msg_param(struct optee_msg_param *msg_params, uint num_params,
const struct tee_param *params)
{
uint n;
for (n = 0; n < num_params; n++) {
const struct tee_param *p = params + n;
struct optee_msg_param *mp = msg_params + n;
switch (p->attr) {
case TEE_PARAM_ATTR_TYPE_NONE:
mp->attr = OPTEE_MSG_ATTR_TYPE_NONE;
memset(&mp->u, 0, sizeof(mp->u));
break;
case TEE_PARAM_ATTR_TYPE_VALUE_INPUT:
case TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT:
case TEE_PARAM_ATTR_TYPE_VALUE_INOUT:
mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
TEE_PARAM_ATTR_TYPE_VALUE_INPUT;
mp->u.value.a = p->u.value.a;
mp->u.value.b = p->u.value.b;
mp->u.value.c = p->u.value.c;
break;
case TEE_PARAM_ATTR_TYPE_MEMREF_INPUT:
case TEE_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
case TEE_PARAM_ATTR_TYPE_MEMREF_INOUT:
mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
mp->u.rmem.shm_ref = (ulong)p->u.memref.shm;
mp->u.rmem.size = p->u.memref.size;
mp->u.rmem.offs = p->u.memref.shm_offs;
break;
default:
return -EINVAL;
}
}
return 0;
}
static int from_msg_param(struct tee_param *params, uint num_params,
const struct optee_msg_param *msg_params)
{
uint n;
struct tee_shm *shm;
for (n = 0; n < num_params; n++) {
struct tee_param *p = params + n;
const struct optee_msg_param *mp = msg_params + n;
u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
switch (attr) {
case OPTEE_MSG_ATTR_TYPE_NONE:
p->attr = TEE_PARAM_ATTR_TYPE_NONE;
memset(&p->u, 0, sizeof(p->u));
break;
case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
p->attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT + attr -
OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
p->u.value.a = mp->u.value.a;
p->u.value.b = mp->u.value.b;
p->u.value.c = mp->u.value.c;
break;
case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
p->attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT + attr -
OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
p->u.memref.size = mp->u.rmem.size;
shm = (struct tee_shm *)(ulong)mp->u.rmem.shm_ref;
if (!shm) {
p->u.memref.shm_offs = 0;
p->u.memref.shm = NULL;
break;
}
p->u.memref.shm_offs = mp->u.rmem.offs;
p->u.memref.shm = shm;
break;
default:
return -EINVAL;
}
}
return 0;
}
static void handle_rpc(struct udevice *dev, struct rpc_param *param,
void *page_list)
{
struct tee_shm *shm;
switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
case OPTEE_SMC_RPC_FUNC_ALLOC:
if (!__tee_shm_add(dev, OPTEE_MSG_NONCONTIG_PAGE_SIZE, NULL,
param->a1, TEE_SHM_ALLOC | TEE_SHM_REGISTER,
&shm)) {
reg_pair_from_64(¶m->a1, ¶m->a2,
virt_to_phys(shm->addr));
/* "cookie" */
reg_pair_from_64(¶m->a4, ¶m->a5, (ulong)shm);
} else {
param->a1 = 0;
param->a2 = 0;
param->a4 = 0;
param->a5 = 0;
}
break;
case OPTEE_SMC_RPC_FUNC_FREE:
shm = reg_pair_to_ptr(param->a1, param->a2);
tee_shm_free(shm);
break;
case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
break;
case OPTEE_SMC_RPC_FUNC_CMD:
shm = reg_pair_to_ptr(param->a1, param->a2);
optee_suppl_cmd(dev, shm, page_list);
break;
default:
break;
}
param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
}
static u32 call_err_to_res(u32 call_err)
{
switch (call_err) {
case OPTEE_SMC_RETURN_OK:
return TEE_SUCCESS;
default:
return TEE_ERROR_BAD_PARAMETERS;
}
}
static void flush_shm_dcache(struct udevice *dev, struct optee_msg_arg *arg)
{
size_t sz = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
flush_dcache_range(rounddown((ulong)arg, CONFIG_SYS_CACHELINE_SIZE),
roundup((ulong)arg + sz, CONFIG_SYS_CACHELINE_SIZE));
tee_flush_all_shm_dcache(dev);
}
static u32 do_call_with_arg(struct udevice *dev, struct optee_msg_arg *arg)
{
struct optee_pdata *pdata = dev_get_plat(dev);
struct rpc_param param = { .a0 = OPTEE_SMC_CALL_WITH_ARG };
void *page_list = NULL;
reg_pair_from_64(¶m.a1, ¶m.a2, virt_to_phys(arg));
while (true) {
struct arm_smccc_res res;
/* If cache are off from U-Boot, sync the cache shared with OP-TEE */
if (!dcache_status())
flush_shm_dcache(dev, arg);
pdata->invoke_fn(param.a0, param.a1, param.a2, param.a3,
param.a4, param.a5, param.a6, param.a7, &res);
/* If cache are off from U-Boot, sync the cache shared with OP-TEE */
if (!dcache_status())
flush_shm_dcache(dev, arg);
free(page_list);
page_list = NULL;
if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
param.a0 = res.a0;
param.a1 = res.a1;
param.a2 = res.a2;
param.a3 = res.a3;
handle_rpc(dev, ¶m, &page_list);
} else {
/*
* In case we've accessed RPMB to serve an RPC
* request we need to restore the previously
* selected partition as the caller may expect it
* to remain unchanged.
*/
optee_suppl_rpmb_release(dev);
return call_err_to_res(res.a0);
}
}
}
static int optee_close_session(struct udevice *dev, u32 session)
{
int rc;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
rc = get_msg_arg(dev, 0, &shm, &msg_arg);
if (rc)
return rc;
msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
msg_arg->session = session;
do_call_with_arg(dev, msg_arg);
tee_shm_free(shm);
return 0;
}
static int optee_open_session(struct udevice *dev,
struct tee_open_session_arg *arg,
uint num_params, struct tee_param *params)
{
int rc;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
rc = get_msg_arg(dev, num_params + 2, &shm, &msg_arg);
if (rc)
return rc;
msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
/*
* Initialize and add the meta parameters needed when opening a
* session.
*/
msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
OPTEE_MSG_ATTR_META;
msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
OPTEE_MSG_ATTR_META;
memcpy(&msg_arg->params[0].u.value, arg->uuid, sizeof(arg->uuid));
memcpy(&msg_arg->params[1].u.value, arg->uuid, sizeof(arg->clnt_uuid));
msg_arg->params[1].u.value.c = arg->clnt_login;
rc = to_msg_param(msg_arg->params + 2, num_params, params);
if (rc)
goto out;
arg->ret = do_call_with_arg(dev, msg_arg);
if (arg->ret) {
arg->ret_origin = TEE_ORIGIN_COMMS;
goto out;
}
if (from_msg_param(params, num_params, msg_arg->params + 2)) {
arg->ret = TEE_ERROR_COMMUNICATION;
arg->ret_origin = TEE_ORIGIN_COMMS;
/* Close session again to avoid leakage */
optee_close_session(dev, msg_arg->session);
goto out;
}
arg->session = msg_arg->session;
arg->ret = msg_arg->ret;
arg->ret_origin = msg_arg->ret_origin;
out:
tee_shm_free(shm);
return rc;
}
static int optee_invoke_func(struct udevice *dev, struct tee_invoke_arg *arg,
uint num_params, struct tee_param *params)
{
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
int rc;
rc = get_msg_arg(dev, num_params, &shm, &msg_arg);
if (rc)
return rc;
msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
msg_arg->func = arg->func;
msg_arg->session = arg->session;
rc = to_msg_param(msg_arg->params, num_params, params);
if (rc)
goto out;
arg->ret = do_call_with_arg(dev, msg_arg);
if (arg->ret) {
arg->ret_origin = TEE_ORIGIN_COMMS;
goto out;
}
if (from_msg_param(params, num_params, msg_arg->params)) {
arg->ret = TEE_ERROR_COMMUNICATION;
arg->ret_origin = TEE_ORIGIN_COMMS;
goto out;
}
arg->ret = msg_arg->ret;
arg->ret_origin = msg_arg->ret_origin;
out:
tee_shm_free(shm);
return rc;
}
static int optee_shm_register(struct udevice *dev, struct tee_shm *shm)
{
struct tee_shm *shm_arg;
struct optee_msg_arg *msg_arg;
void *pl;
u64 ph_ptr;
int rc;
rc = get_msg_arg(dev, 1, &shm_arg, &msg_arg);
if (rc)
return rc;
pl = optee_alloc_and_init_page_list(shm->addr, shm->size, &ph_ptr);
if (!pl) {
rc = -ENOMEM;
goto out;
}
msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
OPTEE_MSG_ATTR_NONCONTIG;
msg_arg->params->u.tmem.buf_ptr = ph_ptr;
msg_arg->params->u.tmem.shm_ref = (ulong)shm;
msg_arg->params->u.tmem.size = shm->size;
if (do_call_with_arg(dev, msg_arg) || msg_arg->ret)
rc = -EINVAL;
free(pl);
out:
tee_shm_free(shm_arg);
return rc;
}
static int optee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
{
struct tee_shm *shm_arg;
struct optee_msg_arg *msg_arg;
int rc;
rc = get_msg_arg(dev, 1, &shm_arg, &msg_arg);
if (rc)
return rc;
msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
msg_arg->params[0].u.rmem.shm_ref = (ulong)shm;
if (do_call_with_arg(dev, msg_arg) || msg_arg->ret)
rc = -EINVAL;
tee_shm_free(shm_arg);
return rc;
}
static const struct tee_driver_ops optee_ops = {
.get_version = optee_get_version,
.open_session = optee_open_session,
.close_session = optee_close_session,
.invoke_func = optee_invoke_func,
.shm_register = optee_shm_register,
.shm_unregister = optee_shm_unregister,
};
static bool is_optee_api(optee_invoke_fn *invoke_fn)
{
struct arm_smccc_res res;
invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
return res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3;
}
static void print_os_revision(struct udevice *dev, optee_invoke_fn *invoke_fn)
{
union {
struct arm_smccc_res smccc;
struct optee_smc_call_get_os_revision_result result;
} res = {
.result = {
.build_id = 0
}
};
invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
&res.smccc);
if (res.result.build_id)
dev_info(dev, "OP-TEE: revision %lu.%lu (%08lx)\n",
res.result.major, res.result.minor,
res.result.build_id);
else
dev_info(dev, "OP-TEE: revision %lu.%lu\n",
res.result.major, res.result.minor);
}
static bool api_revision_is_compatible(optee_invoke_fn *invoke_fn)
{
union {
struct arm_smccc_res smccc;
struct optee_smc_calls_revision_result result;
} res;
invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
return res.result.major == OPTEE_MSG_REVISION_MAJOR &&
(int)res.result.minor >= OPTEE_MSG_REVISION_MINOR;
}
static bool exchange_capabilities(optee_invoke_fn *invoke_fn, u32 *sec_caps)
{
union {
struct arm_smccc_res smccc;
struct optee_smc_exchange_capabilities_result result;
} res;
invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES,
OPTEE_SMC_NSEC_CAP_UNIPROCESSOR, 0, 0, 0, 0, 0, 0,
&res.smccc);
if (res.result.status != OPTEE_SMC_RETURN_OK)
return false;
*sec_caps = res.result.capabilities;
return true;
}
/* Simple wrapper functions to be able to use a function pointer */
static void optee_smccc_smc(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3,
unsigned long a4, unsigned long a5,
unsigned long a6, unsigned long a7,
struct arm_smccc_res *res)
{
arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
}
static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3,
unsigned long a4, unsigned long a5,
unsigned long a6, unsigned long a7,
struct arm_smccc_res *res)
{
arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
}
static optee_invoke_fn *get_invoke_func(struct udevice *dev)
{
const char *method;
debug("optee: looking for conduit method in DT.\n");
method = ofnode_get_property(dev_ofnode(dev), "method", NULL);
if (!method) {
debug("optee: missing \"method\" property\n");
return ERR_PTR(-ENXIO);
}
if (!strcmp("hvc", method))
return optee_smccc_hvc;
else if (!strcmp("smc", method))
return optee_smccc_smc;
debug("optee: invalid \"method\" property: %s\n", method);
return ERR_PTR(-EINVAL);
}
static int optee_of_to_plat(struct udevice *dev)
{
struct optee_pdata *pdata = dev_get_plat(dev);
pdata->invoke_fn = get_invoke_func(dev);
if (IS_ERR(pdata->invoke_fn))
return PTR_ERR(pdata->invoke_fn);
return 0;
}
static int optee_bind(struct udevice *dev)
{
if (IS_ENABLED(CONFIG_OPTEE_SERVICE_DISCOVERY))
dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
return 0;
}
static int optee_probe(struct udevice *dev)
{
struct optee_pdata *pdata = dev_get_plat(dev);
u32 sec_caps;
int ret;
if (!is_optee_api(pdata->invoke_fn)) {
dev_err(dev, "OP-TEE api uid mismatch\n");
return -ENOENT;
}
print_os_revision(dev, pdata->invoke_fn);
if (!api_revision_is_compatible(pdata->invoke_fn)) {
dev_err(dev, "OP-TEE api revision mismatch\n");
return -ENOENT;
}
/*
* OP-TEE can use both shared memory via predefined pool or as
* dynamic shared memory provided by normal world. To keep things
* simple we're only using dynamic shared memory in this driver.
*/
if (!exchange_capabilities(pdata->invoke_fn, &sec_caps) ||
!(sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)) {
dev_err(dev, "OP-TEE capabilities mismatch\n");
return -ENOENT;
}
if (IS_ENABLED(CONFIG_OPTEE_SERVICE_DISCOVERY)) {
ret = bind_service_drivers(dev);
if (ret)
return ret;
} else if (IS_ENABLED(CONFIG_RNG_OPTEE)) {
/*
* Discovery of TAs on the TEE bus is not supported in U-Boot:
* only bind the drivers associated to the supported OP-TEE TA
*/
ret = device_bind_driver_to_node(dev, "optee-rng", "optee-rng",
dev_ofnode(dev), NULL);
if (ret)
dev_warn(dev, "optee-rng failed to bind: %d\n", ret);
}
return 0;
}
static const struct udevice_id optee_match[] = {
{ .compatible = "linaro,optee-tz" },
{},
};
U_BOOT_DRIVER(optee) = {
.name = "optee",
.id = UCLASS_TEE,
.of_match = optee_match,
.of_to_plat = optee_of_to_plat,
.probe = optee_probe,
.bind = optee_bind,
.ops = &optee_ops,
.plat_auto = sizeof(struct optee_pdata),
.priv_auto = sizeof(struct optee_private),
};
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