2016-12-06 16:15:22 +00:00
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/*
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* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* Driver for GIC600-specific features. This driver only overrides APIs that are
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* different to those generic ones in GICv3 driver.
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*
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* GIC600 supports independently power-gating redistributor interface.
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*/
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#include <arch_helpers.h>
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#include <assert.h>
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#include <gicv3.h>
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#include "gicv3_private.h"
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/* GIC600-specific register offsets */
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2017-08-03 15:59:49 +01:00
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#define GICR_PWRR 0x24
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2016-12-06 16:15:22 +00:00
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/* GICR_PWRR fields */
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#define PWRR_RDPD_SHIFT 0
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#define PWRR_RDGPD_SHIFT 2
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#define PWRR_RDGPO_SHIFT 3
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2017-08-03 15:59:49 +01:00
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#define PWRR_RDGPD (1 << PWRR_RDGPD_SHIFT)
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#define PWRR_RDGPO (1 << PWRR_RDGPO_SHIFT)
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2016-12-06 16:15:22 +00:00
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/* Values to write to GICR_PWRR register to power redistributor */
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2017-08-03 15:59:49 +01:00
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#define PWRR_ON (0 << PWRR_RDPD_SHIFT)
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#define PWRR_OFF (1 << PWRR_RDPD_SHIFT)
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2016-12-06 16:15:22 +00:00
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/* GIC600-specific accessor functions */
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static void gicr_write_pwrr(uintptr_t base, unsigned int val)
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{
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2017-08-03 15:59:49 +01:00
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mmio_write_32(base + GICR_PWRR, val);
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2016-12-06 16:15:22 +00:00
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}
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static uint32_t gicr_read_pwrr(uintptr_t base)
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{
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2017-08-03 15:59:49 +01:00
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return mmio_read_32(base + GICR_PWRR);
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2016-12-06 16:15:22 +00:00
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}
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static int gicr_group_powering_down(uint32_t pwrr)
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{
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/*
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* Whether the redistributor group power down operation is in transit:
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* i.e. it's intending to, but not finished yet.
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*/
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return ((pwrr & PWRR_RDGPD) && !(pwrr & PWRR_RDGPO));
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}
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static void gic600_pwr_on(uintptr_t base)
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{
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/* Power on redistributor */
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gicr_write_pwrr(base, PWRR_ON);
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/* Wait until the power on state is reflected */
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while (gicr_read_pwrr(base) & PWRR_RDGPO)
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;
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}
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static void gic600_pwr_off(uintptr_t base)
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{
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/* Power off redistributor */
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gicr_write_pwrr(base, PWRR_OFF);
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/*
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* If this is the last man, turning this redistributor frame off will
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* result in the group itself being powered off. In that case, wait as
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* long as it's in transition, or has aborted the transition altogether
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* for any reason.
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*/
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if (gicr_read_pwrr(base) & PWRR_RDGPD) {
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while (gicr_group_powering_down(gicr_read_pwrr(base)))
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;
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}
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}
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2017-07-13 15:19:51 +01:00
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void gicv3_distif_pre_save(unsigned int proc_num)
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{
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arm_gicv3_distif_pre_save(proc_num);
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}
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void gicv3_distif_post_restore(unsigned int proc_num)
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{
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arm_gicv3_distif_post_restore(proc_num);
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}
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2016-12-06 16:15:22 +00:00
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/*
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* Power off GIC600 redistributor
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*/
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void gicv3_rdistif_off(unsigned int proc_num)
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{
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uintptr_t gicr_base;
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assert(gicv3_driver_data);
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assert(proc_num < gicv3_driver_data->rdistif_num);
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assert(gicv3_driver_data->rdistif_base_addrs);
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gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
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assert(gicr_base);
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/* Attempt to power redistributor off */
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gic600_pwr_off(gicr_base);
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}
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/*
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* Power on GIC600 redistributor
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*/
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void gicv3_rdistif_on(unsigned int proc_num)
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{
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uintptr_t gicr_base;
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assert(gicv3_driver_data);
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assert(proc_num < gicv3_driver_data->rdistif_num);
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assert(gicv3_driver_data->rdistif_base_addrs);
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gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
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assert(gicr_base);
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/* Power redistributor on */
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gic600_pwr_on(gicr_base);
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}
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