// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015, Linaro Limited
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/arm-smccc.h>
#include <linux/crash_dump.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>
#include "optee_private.h"
#include "optee_smc.h"
#include "shm_pool.h"

#define DRIVER_NAME "optee"

#define OPTEE_SHM_NUM_PRIV_PAGES        CONFIG_OPTEE_SHM_NUM_PRIV_PAGES

/**
 * optee_from_msg_param() - convert from OPTEE_MSG parameters to
 *                          struct tee_param
 * @params:     subsystem internal parameter representation
 * @num_params: number of elements in the parameter arrays
 * @msg_params: OPTEE_MSG parameters
 * Returns 0 on success or <0 on failure
 */
int optee_from_msg_param(struct tee_param *params, size_t num_params,
                         const struct optee_msg_param *msg_params)
{
        int rc;
        size_t n;
        struct tee_shm *shm;
        phys_addr_t pa;

        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_IOCTL_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_IOCTL_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_TMEM_INPUT:
                case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
                case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
                        p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
                                  attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
                        p->u.memref.size = mp->u.tmem.size;
                        shm = (struct tee_shm *)(unsigned long)
                                mp->u.tmem.shm_ref;
                        if (!shm) {
                                p->u.memref.shm_offs = 0;
                                p->u.memref.shm = NULL;
                                break;
                        }
                        rc = tee_shm_get_pa(shm, 0, &pa);
                        if (rc)
                                return rc;
                        p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
                        p->u.memref.shm = shm;
                        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_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
                                  attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
                        p->u.memref.size = mp->u.rmem.size;
                        shm = (struct tee_shm *)(unsigned long)
                                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 int to_msg_param_tmp_mem(struct optee_msg_param *mp,
                                const struct tee_param *p)
{
        int rc;
        phys_addr_t pa;

        mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
                   TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;

        mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
        mp->u.tmem.size = p->u.memref.size;

        if (!p->u.memref.shm) {
                mp->u.tmem.buf_ptr = 0;
                return 0;
        }

        rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
        if (rc)
                return rc;

        mp->u.tmem.buf_ptr = pa;
        mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
                    OPTEE_MSG_ATTR_CACHE_SHIFT;

        return 0;
}

static int to_msg_param_reg_mem(struct optee_msg_param *mp,
                                const struct tee_param *p)
{
        mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
                   TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;

        mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
        mp->u.rmem.size = p->u.memref.size;
        mp->u.rmem.offs = p->u.memref.shm_offs;
        return 0;
}

/**
 * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
 * @msg_params: OPTEE_MSG parameters
 * @num_params: number of elements in the parameter arrays
 * @params:     subsystem itnernal parameter representation
 * Returns 0 on success or <0 on failure
 */
int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
                       const struct tee_param *params)
{
        int rc;
        size_t 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_IOCTL_PARAM_ATTR_TYPE_NONE:
                        mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
                        memset(&mp->u, 0, sizeof(mp->u));
                        break;
                case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
                case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
                case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
                        mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
                                   TEE_IOCTL_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_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
                case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
                case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
                        if (tee_shm_is_registered(p->u.memref.shm))
                                rc = to_msg_param_reg_mem(mp, p);
                        else
                                rc = to_msg_param_tmp_mem(mp, p);
                        if (rc)
                                return rc;
                        break;
                default:
                        return -EINVAL;
                }
        }
        return 0;
}

static void optee_get_version(struct tee_device *teedev,
                              struct tee_ioctl_version_data *vers)
{
        struct tee_ioctl_version_data v = {
                .impl_id = TEE_IMPL_ID_OPTEE,
                .impl_caps = TEE_OPTEE_CAP_TZ,
                .gen_caps = TEE_GEN_CAP_GP,
        };
        struct optee *optee = tee_get_drvdata(teedev);

        if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
                v.gen_caps |= TEE_GEN_CAP_REG_MEM;
        if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
                v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
        *vers = v;
}

static void optee_bus_scan(struct work_struct *work)
{
        WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
}

static int optee_open(struct tee_context *ctx)
{
        struct optee_context_data *ctxdata;
        struct tee_device *teedev = ctx->teedev;
        struct optee *optee = tee_get_drvdata(teedev);

        ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
        if (!ctxdata)
                return -ENOMEM;

        if (teedev == optee->supp_teedev) {
                bool busy = true;

                mutex_lock(&optee->supp.mutex);
                if (!optee->supp.ctx) {
                        busy = false;
                        optee->supp.ctx = ctx;
                }
                mutex_unlock(&optee->supp.mutex);
                if (busy) {
                        kfree(ctxdata);
                        return -EBUSY;
                }

                if (!optee->scan_bus_done) {
                        INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
                        optee->scan_bus_wq = create_workqueue("optee_bus_scan");
                        if (!optee->scan_bus_wq) {
                                kfree(ctxdata);
                                return -ECHILD;
                        }
                        queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
                        optee->scan_bus_done = true;
                }
        }
        mutex_init(&ctxdata->mutex);
        INIT_LIST_HEAD(&ctxdata->sess_list);

        if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
                ctx->cap_memref_null  = true;
        else
                ctx->cap_memref_null = false;

        ctx->data = ctxdata;
        return 0;
}

static void optee_release(struct tee_context *ctx)
{
        struct optee_context_data *ctxdata = ctx->data;
        struct tee_device *teedev = ctx->teedev;
        struct optee *optee = tee_get_drvdata(teedev);
        struct tee_shm *shm;
        struct optee_msg_arg *arg = NULL;
        phys_addr_t parg;
        struct optee_session *sess;
        struct optee_session *sess_tmp;

        if (!ctxdata)
                return;

        shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg),
                            TEE_SHM_MAPPED | TEE_SHM_PRIV);
        if (!IS_ERR(shm)) {
                arg = tee_shm_get_va(shm, 0);
                /*
                 * If va2pa fails for some reason, we can't call into
                 * secure world, only free the memory. Secure OS will leak
                 * sessions and finally refuse more sessions, but we will
                 * at least let normal world reclaim its memory.
                 */
                if (!IS_ERR(arg))
                        if (tee_shm_va2pa(shm, arg, &parg))
                                arg = NULL; /* prevent usage of parg below */
        }

        list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
                                 list_node) {
                list_del(&sess->list_node);
                if (!IS_ERR_OR_NULL(arg)) {
                        memset(arg, 0, sizeof(*arg));
                        arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
                        arg->session = sess->session_id;
                        optee_do_call_with_arg(ctx, parg);
                }
                kfree(sess);
        }
        kfree(ctxdata);

        if (!IS_ERR(shm))
                tee_shm_free(shm);

        ctx->data = NULL;

        if (teedev == optee->supp_teedev) {
                if (optee->scan_bus_wq) {
                        destroy_workqueue(optee->scan_bus_wq);
                        optee->scan_bus_wq = NULL;
                }
                optee_supp_release(&optee->supp);
        }
}

static const struct tee_driver_ops optee_ops = {
        .get_version = optee_get_version,
        .open = optee_open,
        .release = optee_release,
        .open_session = optee_open_session,
        .close_session = optee_close_session,
        .invoke_func = optee_invoke_func,
        .cancel_req = optee_cancel_req,
        .shm_register = optee_shm_register,
        .shm_unregister = optee_shm_unregister,
};

static const struct tee_desc optee_desc = {
        .name = DRIVER_NAME "-clnt",
        .ops = &optee_ops,
        .owner = THIS_MODULE,
};

static const struct tee_driver_ops optee_supp_ops = {
        .get_version = optee_get_version,
        .open = optee_open,
        .release = optee_release,
        .supp_recv = optee_supp_recv,
        .supp_send = optee_supp_send,
        .shm_register = optee_shm_register_supp,
        .shm_unregister = optee_shm_unregister_supp,
};

static const struct tee_desc optee_supp_desc = {
        .name = DRIVER_NAME "-supp",
        .ops = &optee_supp_ops,
        .owner = THIS_MODULE,
        .flags = TEE_DESC_PRIVILEGED,
};

static bool optee_msg_api_uid_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);

        if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
            res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
                return true;
        return false;
}

static void optee_msg_get_os_revision(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)
                pr_info("revision %lu.%lu (%08lx)", res.result.major,
                        res.result.minor, res.result.build_id);
        else
                pr_info("revision %lu.%lu", res.result.major, res.result.minor);
}

static bool optee_msg_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);

        if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
            (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
                return true;
        return false;
}

static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
                                            u32 *sec_caps)
{
        union {
                struct arm_smccc_res smccc;
                struct optee_smc_exchange_capabilities_result result;
        } res;
        u32 a1 = 0;

        /*
         * TODO This isn't enough to tell if it's UP system (from kernel
         * point of view) or not, is_smp() returns the the information
         * needed, but can't be called directly from here.
         */
        if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
                a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;

        invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 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;
}

static struct tee_shm_pool *optee_config_dyn_shm(void)
{
        struct tee_shm_pool_mgr *priv_mgr;
        struct tee_shm_pool_mgr *dmabuf_mgr;
        void *rc;

        rc = optee_shm_pool_alloc_pages();
        if (IS_ERR(rc))
                return rc;
        priv_mgr = rc;

        rc = optee_shm_pool_alloc_pages();
        if (IS_ERR(rc)) {
                tee_shm_pool_mgr_destroy(priv_mgr);
                return rc;
        }
        dmabuf_mgr = rc;

        rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
        if (IS_ERR(rc)) {
                tee_shm_pool_mgr_destroy(priv_mgr);
                tee_shm_pool_mgr_destroy(dmabuf_mgr);
        }

        return rc;
}

static struct tee_shm_pool *
optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
{
        union {
                struct arm_smccc_res smccc;
                struct optee_smc_get_shm_config_result result;
        } res;
        unsigned long vaddr;
        phys_addr_t paddr;
        size_t size;
        phys_addr_t begin;
        phys_addr_t end;
        void *va;
        struct tee_shm_pool_mgr *priv_mgr;
        struct tee_shm_pool_mgr *dmabuf_mgr;
        void *rc;
        const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;

        invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
        if (res.result.status != OPTEE_SMC_RETURN_OK) {
                pr_err("static shm service not available\n");
                return ERR_PTR(-ENOENT);
        }

        if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
                pr_err("only normal cached shared memory supported\n");
                return ERR_PTR(-EINVAL);
        }

        begin = roundup(res.result.start, PAGE_SIZE);
        end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
        paddr = begin;
        size = end - begin;

        if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
                pr_err("too small shared memory area\n");
                return ERR_PTR(-EINVAL);
        }

        va = memremap(paddr, size, MEMREMAP_WB);
        if (!va) {
                pr_err("shared memory ioremap failed\n");
                return ERR_PTR(-EINVAL);
        }
        vaddr = (unsigned long)va;

        rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
                                            3 /* 8 bytes aligned */);
        if (IS_ERR(rc))
                goto err_memunmap;
        priv_mgr = rc;

        vaddr += sz;
        paddr += sz;
        size -= sz;

        rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
        if (IS_ERR(rc))
                goto err_free_priv_mgr;
        dmabuf_mgr = rc;

        rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
        if (IS_ERR(rc))
                goto err_free_dmabuf_mgr;

        *memremaped_shm = va;

        return rc;

err_free_dmabuf_mgr:
        tee_shm_pool_mgr_destroy(dmabuf_mgr);
err_free_priv_mgr:
        tee_shm_pool_mgr_destroy(priv_mgr);
err_memunmap:
        memunmap(va);
        return rc;
}

/* 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 device *dev)
{
        const char *method;

        pr_info("probing for conduit method.\n");

        if (device_property_read_string(dev, "method", &method)) {
                pr_warn("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;

        pr_warn("invalid \"method\" property: %s\n", method);
        return ERR_PTR(-EINVAL);
}

/* optee_remove - Device Removal Routine
 * @pdev: platform device information struct
 *
 * optee_remove is called by platform subsystem to alert the driver
 * that it should release the device
 */

static int optee_remove(struct platform_device *pdev)
{
        struct optee *optee = platform_get_drvdata(pdev);

        /* Unregister OP-TEE specific client devices on TEE bus */
        optee_unregister_devices();

        /*
         * Ask OP-TEE to free all cached shared memory objects to decrease
         * reference counters and also avoid wild pointers in secure world
         * into the old shared memory range.
         */
        optee_disable_shm_cache(optee);

        /*
         * The two devices have to be unregistered before we can free the
         * other resources.
         */
        tee_device_unregister(optee->supp_teedev);
        tee_device_unregister(optee->teedev);

        tee_shm_pool_free(optee->pool);
        if (optee->memremaped_shm)
                memunmap(optee->memremaped_shm);
        optee_wait_queue_exit(&optee->wait_queue);
        optee_supp_uninit(&optee->supp);
        mutex_destroy(&optee->call_queue.mutex);

        kfree(optee);

        return 0;
}

/* optee_shutdown - Device Removal Routine
 * @pdev: platform device information struct
 *
 * platform_shutdown is called by the platform subsystem to alert
 * the driver that a shutdown, reboot, or kexec is happening and
 * device must be disabled.
 */
static void optee_shutdown(struct platform_device *pdev)
{
        optee_disable_shm_cache(platform_get_drvdata(pdev));
}

static int optee_probe(struct platform_device *pdev)
{
        optee_invoke_fn *invoke_fn;
        struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
        struct optee *optee = NULL;
        void *memremaped_shm = NULL;
        struct tee_device *teedev;
        u32 sec_caps;
        int rc;

        /*
         * The kernel may have crashed at the same time that all available
         * secure world threads were suspended and we cannot reschedule the
         * suspended threads without access to the crashed kernel's wait_queue.
         * Therefore, we cannot reliably initialize the OP-TEE driver in the
         * kdump kernel.
         */
        if (is_kdump_kernel())
                return -ENODEV;

        invoke_fn = get_invoke_func(&pdev->dev);
        if (IS_ERR(invoke_fn))
                return PTR_ERR(invoke_fn);

        if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
                pr_warn("api uid mismatch\n");
                return -EINVAL;
        }

        optee_msg_get_os_revision(invoke_fn);

        if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
                pr_warn("api revision mismatch\n");
                return -EINVAL;
        }

        if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
                pr_warn("capabilities mismatch\n");
                return -EINVAL;
        }

        /*
         * Try to use dynamic shared memory if possible
         */
        if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
                pool = optee_config_dyn_shm();

        /*
         * If dynamic shared memory is not available or failed - try static one
         */
        if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
                pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);

        if (IS_ERR(pool))
                return PTR_ERR(pool);

        optee = kzalloc(sizeof(*optee), GFP_KERNEL);
        if (!optee) {
                rc = -ENOMEM;
                goto err;
        }

        optee->invoke_fn = invoke_fn;
        optee->sec_caps = sec_caps;

        teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
        if (IS_ERR(teedev)) {
                rc = PTR_ERR(teedev);
                goto err;
        }
        optee->teedev = teedev;

        teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
        if (IS_ERR(teedev)) {
                rc = PTR_ERR(teedev);
                goto err;
        }
        optee->supp_teedev = teedev;

        rc = tee_device_register(optee->teedev);
        if (rc)
                goto err;

        rc = tee_device_register(optee->supp_teedev);
        if (rc)
                goto err;

        mutex_init(&optee->call_queue.mutex);
        INIT_LIST_HEAD(&optee->call_queue.waiters);
        optee_wait_queue_init(&optee->wait_queue);
        optee_supp_init(&optee->supp);
        optee->memremaped_shm = memremaped_shm;
        optee->pool = pool;

        /*
         * Ensure that there are no pre-existing shm objects before enabling
         * the shm cache so that there's no chance of receiving an invalid
         * address during shutdown. This could occur, for example, if we're
         * kexec booting from an older kernel that did not properly cleanup the
         * shm cache.
         */
        optee_disable_unmapped_shm_cache(optee);

        optee_enable_shm_cache(optee);

        if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
                pr_info("dynamic shared memory is enabled\n");

        platform_set_drvdata(pdev, optee);

        rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
        if (rc) {
                optee_remove(pdev);
                return rc;
        }

        pr_info("initialized driver\n");
        return 0;
err:
        if (optee) {
                /*
                 * tee_device_unregister() is safe to call even if the
                 * devices hasn't been registered with
                 * tee_device_register() yet.
                 */
                tee_device_unregister(optee->supp_teedev);
                tee_device_unregister(optee->teedev);
                kfree(optee);
        }
        if (pool)
                tee_shm_pool_free(pool);
        if (memremaped_shm)
                memunmap(memremaped_shm);
        return rc;
}

static const struct of_device_id optee_dt_match[] = {
        { .compatible = "linaro,optee-tz" },
        {},
};
MODULE_DEVICE_TABLE(of, optee_dt_match);

static struct platform_driver optee_driver = {
        .probe  = optee_probe,
        .remove = optee_remove,
        .shutdown = optee_shutdown,
        .driver = {
                .name = "optee",
                .of_match_table = optee_dt_match,
        },
};
module_platform_driver(optee_driver);

MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:optee");