diff options
Diffstat (limited to 'services/spd/tspd/tspd_pm.c')
| -rw-r--r-- | services/spd/tspd/tspd_pm.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/services/spd/tspd/tspd_pm.c b/services/spd/tspd/tspd_pm.c new file mode 100644 index 0000000..ec4989d --- /dev/null +++ b/services/spd/tspd/tspd_pm.c @@ -0,0 +1,205 @@ +/* + * Copyright (c) 2013-2014, ARM Limited and Contributors. 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 ARM 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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. + */ + +#include <arch_helpers.h> +#include <assert.h> +#include <bl_common.h> +#include <context_mgmt.h> +#include <debug.h> +#include <platform.h> +#include <tsp.h> +#include "tspd_private.h" + +/******************************************************************************* + * The target cpu is being turned on. Allow the TSPD/TSP to perform any actions + * needed. Nothing at the moment. + ******************************************************************************/ +static void tspd_cpu_on_handler(uint64_t target_cpu) +{ +} + +/******************************************************************************* + * This cpu is being turned off. Allow the TSPD/TSP to perform any actions + * needed + ******************************************************************************/ +static int32_t tspd_cpu_off_handler(uint64_t cookie) +{ + int32_t rc = 0; + uint64_t mpidr = read_mpidr(); + uint32_t linear_id = platform_get_core_pos(mpidr); + tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id]; + + assert(tsp_vectors); + assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON); + + /* Program the entry point and enter the TSP */ + cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->cpu_off_entry); + rc = tspd_synchronous_sp_entry(tsp_ctx); + + /* + * Read the response from the TSP. A non-zero return means that + * something went wrong while communicating with the TSP. + */ + if (rc != 0) + panic(); + + /* + * Reset TSP's context for a fresh start when this cpu is turned on + * subsequently. + */ + set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_OFF); + + return 0; +} + +/******************************************************************************* + * This cpu is being suspended. S-EL1 state must have been saved in the + * resident cpu (mpidr format) if it is a UP/UP migratable TSP. + ******************************************************************************/ +static void tspd_cpu_suspend_handler(uint64_t power_state) +{ + int32_t rc = 0; + uint64_t mpidr = read_mpidr(); + uint32_t linear_id = platform_get_core_pos(mpidr); + tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id]; + + assert(tsp_vectors); + assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON); + + /* Program the entry point, power_state parameter and enter the TSP */ + write_ctx_reg(get_gpregs_ctx(&tsp_ctx->cpu_ctx), + CTX_GPREG_X0, + power_state); + cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->cpu_suspend_entry); + rc = tspd_synchronous_sp_entry(tsp_ctx); + + /* + * Read the response from the TSP. A non-zero return means that + * something went wrong while communicating with the TSP. + */ + if (rc != 0) + panic(); + + /* Update its context to reflect the state the TSP is in */ + set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_SUSPEND); +} + +/******************************************************************************* + * This cpu has been turned on. Enter the TSP to initialise S-EL1 and other bits + * before passing control back to the Secure Monitor. Entry in S-El1 is done + * after initialising minimal architectural state that guarantees safe + * execution. + ******************************************************************************/ +static void tspd_cpu_on_finish_handler(uint64_t cookie) +{ + int32_t rc = 0; + uint64_t mpidr = read_mpidr(); + uint32_t linear_id = platform_get_core_pos(mpidr); + tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id]; + + assert(tsp_vectors); + assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_OFF); + + /* Initialise this cpu's secure context */ + tspd_init_secure_context((uint64_t) &tsp_vectors->cpu_on_entry, + TSP_AARCH64, + mpidr, + tsp_ctx); + + /* Enter the TSP */ + rc = tspd_synchronous_sp_entry(tsp_ctx); + + /* + * Read the response from the TSP. A non-zero return means that + * something went wrong while communicating with the SP. + */ + if (rc != 0) + panic(); + + /* Update its context to reflect the state the SP is in */ + set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_ON); +} + +/******************************************************************************* + * This cpu has resumed from suspend. The SPD saved the TSP context when it + * completed the preceding suspend call. Use that context to program an entry + * into the TSP to allow it to do any remaining book keeping + ******************************************************************************/ +static void tspd_cpu_suspend_finish_handler(uint64_t suspend_level) +{ + int32_t rc = 0; + uint64_t mpidr = read_mpidr(); + uint32_t linear_id = platform_get_core_pos(mpidr); + tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id]; + + assert(tsp_vectors); + assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_SUSPEND); + + /* Program the entry point, suspend_level and enter the SP */ + write_ctx_reg(get_gpregs_ctx(&tsp_ctx->cpu_ctx), + CTX_GPREG_X0, + suspend_level); + cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->cpu_resume_entry); + rc = tspd_synchronous_sp_entry(tsp_ctx); + + /* + * Read the response from the TSP. A non-zero return means that + * something went wrong while communicating with the TSP. + */ + if (rc != 0) + panic(); + + /* Update its context to reflect the state the SP is in */ + set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_ON); +} + +/******************************************************************************* + * Return the type of TSP the TSPD is dealing with. Report the current resident + * cpu (mpidr format) if it is a UP/UP migratable TSP. + ******************************************************************************/ +static int32_t tspd_cpu_migrate_info(uint64_t *resident_cpu) +{ + return TSP_MIGRATE_INFO; +} + +/******************************************************************************* + * Structure populated by the TSP Dispatcher to be given a chance to perform any + * TSP bookkeeping before PSCI executes a power mgmt. operation. + ******************************************************************************/ +const spd_pm_ops_t tspd_pm = { + tspd_cpu_on_handler, + tspd_cpu_off_handler, + tspd_cpu_suspend_handler, + tspd_cpu_on_finish_handler, + tspd_cpu_suspend_finish_handler, + NULL, + tspd_cpu_migrate_info +}; + |