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GICv3: GIC-600: Detect GIC-600 at runtime

Browse source 
The only difference between GIC-500 and GIC-600 relevant to TF-A is the
differing power management sequence.
A certain GIC implementation is detectable at runtime, for instance by
checking the IIDR register. Let's add that test before initiating the
GIC-600 specific sequence, so the code can be used on both GIC-600 and
GIC-500 chips alike, without deciding on a GIC chip at compile time.

This means that the GIC-500 "driver" is now redundant. To allow minimal
platform support, add a switch to disable GIC-600 support.

Change-Id: I17ea97d9fb05874772ebaa13e6678b4ba3415557
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Andre Przywara 2020-03-25 15:50:38 +00:00 • committed by Madhukar Pappireddy
parent 16af48e4cd
commit b4ad365a46
12 changed files with 73 additions and 71 deletions
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6
docs/getting_started/build-options.rst
View file

@ -711,8 +711,10 @@ GICv3 driver files are included using directive:
The driver can be configured with the following options set in the platform
makefile:
- ``GICV3_IMPL``: Selects between GIC-500 and GIC-600 variants of GICv3.
This option can take values GIC500 and GIC600 with default set to GIC500.
- ``GICV3_SUPPORT_GIC600``: Add support for the GIC-600 variants of GICv3.
Enabling this option will add runtime detection support for the
GIC-600, so is safe to select even for a GIC500 implementation.
This option defaults to 0.
- ``GICV3_IMPL_GIC600_MULTICHIP``: Selects GIC-600 variant with multichip
functionality. This option defaults to 0

1
docs/plat/arm/fvp/index.rst
View file

@ -116,7 +116,6 @@ Arm FVP Platform Specific Build Options
- ``FVP_USE_GIC_DRIVER`` : Selects the GIC driver to be built. Options:
- ``FVP_GIC600`` : The GIC600 implementation of GICv3 is selected
- ``FVP_GICV2`` : The GICv2 only driver is selected
- ``FVP_GICV3`` : The GICv3 only driver is selected (default option)

68
drivers/arm/gic/v3/gic600.c → drivers/arm/gic/v3/gic-x00.c
View file

@ -5,8 +5,9 @@
*/
/*
* Driver for GIC-600 specific features. This driver only overrides
* APIs that are different to those generic ones in GICv3 driver.
* Driver for GIC-500 and GIC-600 specific features. This driver only
* overrides APIs that are different to those generic ones in GICv3
* driver.
*
* GIC-600 supports independently power-gating redistributor interface.
*/
@ -19,7 +20,8 @@
#include "gicv3_private.h"
/* GIC-600 specific register offsets */
#define GICR_PWRR 0x24
#define GICR_PWRR 0x24
#define IIDR_MODEL_ARM_GIC_600 0x0200043b
/* GICR_PWRR fields */
#define PWRR_RDPD_SHIFT 0
@ -39,6 +41,8 @@
#define PWRR_ON (0 << PWRR_RDPD_SHIFT)
#define PWRR_OFF (1 << PWRR_RDPD_SHIFT)
#if GICV3_SUPPORT_GIC600
/* GIC-600 specific accessor functions */
static void gicr_write_pwrr(uintptr_t base, unsigned int val)
{
@ -93,6 +97,29 @@ static void gic600_pwr_off(uintptr_t base)
}
}
static uintptr_t get_gicr_base(unsigned int proc_num)
{
uintptr_t gicr_base;
assert(gicv3_driver_data);
assert(proc_num < gicv3_driver_data->rdistif_num);
assert(gicv3_driver_data->rdistif_base_addrs);
gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
assert(gicr_base);
return gicr_base;
}
static bool gicv3_is_gic600(uintptr_t gicr_base)
{
uint32_t reg = mmio_read_32(gicr_base + GICR_IIDR);
return (reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_600;
}
#endif
void gicv3_distif_pre_save(unsigned int proc_num)
{
arm_gicv3_distif_pre_save(proc_num);
@ -103,38 +130,33 @@ void gicv3_distif_post_restore(unsigned int proc_num)
arm_gicv3_distif_post_restore(proc_num);
}
/*
* Power off GIC-600 redistributor
* Power off GIC-600 redistributor (if configured and detected)
*/
void gicv3_rdistif_off(unsigned int proc_num)
{
uintptr_t gicr_base;
assert(gicv3_driver_data);
assert(proc_num < gicv3_driver_data->rdistif_num);
assert(gicv3_driver_data->rdistif_base_addrs);
gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
assert(gicr_base);
#if GICV3_SUPPORT_GIC600
uintptr_t gicr_base = get_gicr_base(proc_num);
/* Attempt to power redistributor off */
gic600_pwr_off(gicr_base);
if (gicv3_is_gic600(gicr_base)) {
gic600_pwr_off(gicr_base);
}
#endif
}
/*
* Power on GIC-600 redistributor
* Power on GIC-600 redistributor (if configured and detected)
*/
void gicv3_rdistif_on(unsigned int proc_num)
{
uintptr_t gicr_base;
assert(gicv3_driver_data);
assert(proc_num < gicv3_driver_data->rdistif_num);
assert(gicv3_driver_data->rdistif_base_addrs);
gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
assert(gicr_base);
#if GICV3_SUPPORT_GIC600
uintptr_t gicr_base = get_gicr_base(proc_num);
/* Power redistributor on */
gic600_pwr_on(gicr_base);
if (gicv3_is_gic600(gicr_base)) {
gic600_pwr_on(gicr_base);
}
#endif
}

22
drivers/arm/gic/v3/gic500.c
View file

@ -1,22 +0,0 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* Driver for GIC500-specific features. This driver only overrides APIs that are
* different to those generic ones in GICv3 driver.
*/
#include "gicv3_private.h"
void gicv3_distif_pre_save(unsigned int proc_num)
{
arm_gicv3_distif_pre_save(proc_num);
}
void gicv3_distif_post_restore(unsigned int proc_num)
{
arm_gicv3_distif_post_restore(proc_num);
}

17
drivers/arm/gic/v3/gicv3.mk
View file

@ -5,7 +5,7 @@
#
# Default configuration values
GICV3_IMPL ?= GIC500
GICV3_SUPPORT_GIC600 ?= 0
GICV3_IMPL_GIC600_MULTICHIP ?= 0
GICV3_OVERRIDE_DISTIF_PWR_OPS ?= 0
GIC_ENABLE_V4_EXTN ?= 0
@ -20,19 +20,14 @@ ifeq (${GICV3_OVERRIDE_DISTIF_PWR_OPS}, 0)
GICV3_SOURCES += drivers/arm/gic/v3/arm_gicv3_common.c
endif
# Either GIC-600 or GIC-500 can be selected at one time
ifeq (${GICV3_IMPL}, GIC600)
# GIC-600 sources
GICV3_SOURCES += drivers/arm/gic/v3/gic600.c
GICV3_SOURCES += drivers/arm/gic/v3/gic-x00.c
ifeq (${GICV3_IMPL_GIC600_MULTICHIP}, 1)
GICV3_SOURCES += drivers/arm/gic/v3/gic600_multichip.c
endif
else ifeq (${GICV3_IMPL}, GIC500)
# GIC-500 sources
GICV3_SOURCES += drivers/arm/gic/v3/gic500.c
else
$(error "Incorrect GICV3_IMPL value ${GICV3_IMPL}")
endif
# Set GIC-600 support
$(eval $(call assert_boolean,GICV3_SUPPORT_GIC600))
$(eval $(call add_define,GICV3_SUPPORT_GIC600))
# Set GICv4 extension
$(eval $(call assert_boolean,GIC_ENABLE_V4_EXTN))

8
include/drivers/arm/gicv3.h
View file

@ -222,6 +222,14 @@
#define TYPER_PPI_NUM_SHIFT U(27)
#define TYPER_PPI_NUM_MASK U(0x1f)
/* GICR_IIDR bit definitions */
#define IIDR_PRODUCT_ID_MASK 0xff000000
#define IIDR_VARIANT_MASK 0x000f0000
#define IIDR_REVISION_MASK 0x0000f000
#define IIDR_IMPLEMENTER_MASK 0x00000fff
#define IIDR_MODEL_MASK (IIDR_PRODUCT_ID_MASK | \
IIDR_IMPLEMENTER_MASK)
/*******************************************************************************
* GICv3 and 3.1 CPU interface registers & constants
******************************************************************************/

4
plat/arm/board/arm_fpga/platform.mk
View file

@ -70,8 +70,8 @@ else
lib/cpus/aarch64/cortex_a75.S
endif
# GIC-600 configuration
GICV3_IMPL := GIC600
# Allow detection of GIC-600
GICV3_SUPPORT_GIC600 := 1
# Include GICv3 driver files
include drivers/arm/gic/v3/gicv3.mk

9
plat/arm/board/fvp/platform.mk
View file

@ -49,13 +49,10 @@ endif
$(eval $(call add_define,FVP_INTERCONNECT_DRIVER))
# Choose the GIC sources depending upon the how the FVP will be invoked
ifeq (${FVP_USE_GIC_DRIVER},$(filter ${FVP_USE_GIC_DRIVER},FVP_GICV3 FVP_GIC600))
# GIC500 is the default option in case GICV3_IMPL is not set
ifeq (${FVP_USE_GIC_DRIVER}, FVP_GIC600)
GICV3_IMPL := GIC600
endif
ifeq (${FVP_USE_GIC_DRIVER}, FVP_GICV3)
# The GIC model (GIC-600 or GIC-500) will be detected at runtime
GICV3_SUPPORT_GIC600 := 1
GICV3_OVERRIDE_DISTIF_PWR_OPS := 1
# Include GICv3 driver files

2
plat/arm/board/n1sdp/platform.mk
View file

@ -15,7 +15,7 @@ PLAT_INCLUDES := -I${N1SDP_BASE}/include
N1SDP_CPU_SOURCES := lib/cpus/aarch64/neoverse_n1.S
# GIC-600 configuration
GICV3_IMPL := GIC600
GICV3_SUPPORT_GIC600 := 1
GICV3_IMPL_GIC600_MULTICHIP := 1
# Include GICv3 driver files

3
plat/arm/board/tc0/platform.mk
View file

@ -25,7 +25,8 @@ USE_COHERENT_MEM := 0
GIC_ENABLE_V4_EXTN := 1
# GIC-600 configuration
GICV3_IMPL := GIC600
GICV3_SUPPORT_GIC600 := 1
# Include GICv3 driver files
include drivers/arm/gic/v3/gicv3.mk

2
plat/arm/css/sgi/sgi-common.mk
View file

@ -23,7 +23,7 @@ INTERCONNECT_SOURCES := ${CSS_ENT_BASE}/sgi_interconnect.c
PLAT_INCLUDES += -I${CSS_ENT_BASE}/include
# GIC-600 configuration
GICV3_IMPL := GIC600
GICV3_SUPPORT_GIC600 := 1
# Include GICv3 driver files
include drivers/arm/gic/v3/gicv3.mk

2
plat/arm/css/sgm/sgm-common.mk
View file

@ -23,7 +23,7 @@ SGM_CPU_SOURCES := lib/cpus/aarch64/cortex_a55.S \
INTERCONNECT_SOURCES := ${CSS_SGM_BASE}/sgm_interconnect.c
# GIC-600 configuration
GICV3_IMPL := GIC600
GICV3_SUPPORT_GIC600 := 1
# Include GICv3 driver files
include drivers/arm/gic/v3/gicv3.mk