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  1. 17 6月, 2013 1 次提交
  3. 08 6月, 2013 16 次提交
    • J
      ARM: mpu: add MPU initialisation for secondary cores · eb08375e
      由 Jonathan Austin 提交于 
      The MPU initialisation on the primary core is performed in two stages, one
minimal stage to ensure the CPU can boot and a second one after
sanity_check_meminfo. As the memory configuration is known by the time we
boot secondary cores only a single step is necessary, provided the values
for DRSR are passed to secondaries.

This patch implements this arrangement. The configuration generated for the
MPU regions is made available to the secondary core, which can then use the
asm MPU intialisation code to program a complete region configuration.

This is necessary for SMP configurations without an MMU, as the MPU
initialisation is the only way to ensure that memory is specified as
'shared'.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
CC: Nicolas Pitre <nico@linaro.org>
      eb08375e
    • J
      ARM: mpu: Complete initialisation of the MPU after reaching the C-world · 9a271567
      由 Jonathan Austin 提交于 
      Much like with the MMU, MPU initialisation is performed in two stages; the
first in the pre-C world and the 'real' initialisation during arch setup.

This patch wires in previously added MPU initialisation functions so that
the whole of memory is mapped with the appropriate region properties for
'normal' RAM (the appropriate properties depend on whether the system is
SMP).

Stub initialisation functions are added for the case that there MPU support
is not configured in to the kernel.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
CC: Hyok S. Choi <hyok.choi@samsung.com>
      9a271567
    • J
      ARM: mpu: add MPU probe and initialisation functions in C · 5ad7dcbe
      由 Jonathan Austin 提交于 
      This patch adds new functions for probing and initialising the ARMv7
PMSA-compliant MPU.

These use the pre-defined and reserved MPU_PROBE_REGION for establishing
properties of the MPU, which is necessary because certain probe operations
require modifying region properties and reading back the results.

This patch also introduces a minimal sanity_check_meminfo_mpu function, that
ensures that the memory set-up passed to the kernel can be used in conjunction
with the MPU. The base address of a region must be aligned to the region size,
otherwise behavior is unpredictable and region sizes can only be specified as a
power-of-two. To simplify the satisfaction of these requirements this
implementation currently enforces that all memory is contiguous from
PHYS_OFFSET, merging banks that are contiguous but passed in separately.

The functions are added in this patch but wired in to the boot process later
in the series.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
CC: Hyok S. Choi <hyok.choi@samsung.com>
      5ad7dcbe
    • J
      ARM: mpu: add early bring-up code for the ARMv7 PMSA-compliant MPU · 67c9845b
      由 Jonathan Austin 提交于 
      This patch adds initial support for using the MPU, which is necessary for
SMP operation on PMSAv7 processors because it is the only way to ensure
memory is shared. This is an initial patch and full SMP support is added
later in this series.

The setup of the MPU is performed in a way analagous to that for the MMU:
Very early initialisation before the C environment is brought up, followed
by a sanity check and more complete initialisation in C.

This patch provides the simplest possible memory region configuration:
MPU_PROBE_REGION: Reserved for probing MPU details, not enabled
MPU_BG_REGION: A 'background' region that specifies all memory strongly ordered
MPU_RAM_REGION: A single shared, cacheable, normal region for the valid RAM.

In this early initialisation code we simply map the whole of the address
space with the BG_REGION and (at least) the kernel with the RAM_REGION. The
MPU has region alignment constraints that require us to round past the end
of the kernel.

As region 2 has a higher priority than region 1, it overrides the strongly-
ordered behaviour for RAM only.

Subsequent patches will add more complete initialisation from the C-world
and support for bringing up secondary CPUs.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
CC: Hyok S. Choi <hyok.choi@samsung.com>
      67c9845b
    • J
      ARM: mpu: add header for MPU register layouts and region data · a2b45b0d
      由 Jonathan Austin 提交于 
      This commit adds definitions relevant to the ARM v7 PMSA compliant MPU.

The register layouts and region configuration data is made accessible to asm
as well as C-code so that it can be used in early bring-up of the MPU.

The mpu region information structs assume that the properties for the I/D side
are the same, though the implementation could be trivially extended for future
platforms where this is no-longer true.

The MPU_*_REGION defines are used for the basic, static MPU region setup.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
      a2b45b0d
    • J
      ARM: mpu: add PMSA related registers and bitfields to existing headers · aca7e592
      由 Jonathan Austin 提交于 
      This patch adds the following definitions relevant to the PMSA:

Add SCTLR bit 17, (CR_BR - Background Region bit) to the list of CR_*
bitfields. This bit determines whether to use the architecturally defined
memory map

Add the MPUIR to the available registers when using read_cpuid macro. The
MPUIR is the MPU type register.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
CC:"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
      aca7e592
    • J
      ARM: vexpress: Add Cortex-R Series UART, selectable via DEBUG_LL · ed18bdc8
      由 Jonathan Austin 提交于 
      The Cortex-R series processors on Versatile Express have a different memory
map to the RS1 and CA9X4 tiles. Most of the platform difference can be
expressed in device-trees, but the UART definitions for LL_DEBUG cannot.

This patch defines the UART location for R-Series processors on
versatile-express, allowing low-level debug and output from the decompressor.
These definitions are selectable via Kconfig
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
CC: Pawel Moll <pawel.moll@arm.com>
      ed18bdc8
    • J
      ARM: add Cortex-R7 Processor Info · c90ad5c9
      由 Jonathan Austin 提交于 
      This patch adds processor info for ARM Ltd. Cortex-R7.

The R7 has many similarities to the A9 and though the ACTLR layout is not
identical, the bits associated with cache operations broadcasting and SMP
modes are the same for A9, A5 and R7 (Though in the A-class processors the
same bits toggle TLB-ops broadcasting as well as cache-ops)
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Reviewed-by: NWill Deacon <will.deacon@arm.com>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Stephen Boyd <sboyd@codeaurora.org>
      c90ad5c9
    • J
      ARM: select CPU_CPU15_MMU/MPU appropriately · 66567618
      由 Jonathan Austin 提交于 
      Currently CPU_V7 selects CPU_CP15_MMU, however in the case of a V7 CPU
implementing the PMSA, such as the Cortex-R7, the CP15_MMU operations are
not available. Selecting CPU_CP15_MPU is appropriate in this case.

This patch makes CPU_CP15_MMU dependent on the use of the MMU, selecting
CPU_CP15_MPU for v7 processors when !MMU is chosen.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
      66567618
    • J
      ARM: nommu: add stub local_flush_bp_all() for !CONFIG_MMUU · 8d655d83
      由 Jonathan Austin 提交于 
      Since the merging of Will's tlb-ops branch, specifically 89c7e4b8
(ARM: 7661/1: mm: perform explicit branch predictor maintenance when required),
building SMP without CONFIG_MMU has been broken.

The local_flush_bp_all function is only called for operations related to
changing the kernel's view of memory and ASID rollover - both of which are
irrelevant to an !MMU kernel.

This patch adds a stub local_flush_bp_all() function to the other tlb
maintenance stubs and restores the ability to build an SMP !MMU kernel.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
      8d655d83
    • J
      ARM: nommu: Don't build smp_tlb.c for !CONFIG_MMU · 8006b4d1
      由 Jonathan Austin 提交于 
      Without an MMU we don't need to do any TLB maintenance. Until the addition
of 93dc6887 (ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181
(TLBI/DSB operations)) building the tlb maintenance ops in smp_tlb.c worked,
though none of the contents were used.

Since that commit, however, SMP NOMMU has not been able to build. This patch
restores that ability by making the building of smp_tlb.c dependent on MMU.
Signed-off-by: NJonathan Austin <jonathan.austin@arm.com>
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will.deacon@arm.com>
      8006b4d1
    • W
      ARM: suspend: fix CPU suspend code for !CONFIG_MMU configurations · aa1aadc3
      由 Will Deacon 提交于 
      The ARM CPU suspend code can be selected even for a !CONFIG_MMU
configuration. The resulting kernel will not compile and, even if it did,
would access undefined co-processor registers when executing.

This patch fixes the v6 and v7 CPU suspend code for the nommu case.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Tested-by: NJonathan Austin <jonathan.austin@arm.com>
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> (commit_signer:1/3=33%)
CC: Santosh Shilimkar <santosh.shilimkar@ti.com> (commit_signer:1/3=33%)
CC: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
      aa1aadc3
    • W
      ARM: nommu: do not initialise page tables in secondary_data structure · c4a1f032
      由 Will Deacon 提交于 
      nommu systems do not require any page tables, so don't try to initialise
them when bringing up secondary cores.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
      c4a1f032
    • W
      ARM: nommu: provide dummy cpu_switch_mm implementation · 02ed1c7b
      由 Will Deacon 提交于 
      cpu_switch_mm is a logical nop on nommu systems, so define it as such
when !CONFIG_MMU.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
      02ed1c7b
    • W
      ARM: nommu: define dummy TLB operations for nommu configurations · 5c709e69
      由 Will Deacon 提交于 
      nommu platforms do not perform address translation and therefore clearly
don't have TLBs. However, some SMP code assumes the presence of the TLB
flushing routines and will therefore fail to compile for a nommu system.

This patch defines dummy local_* TLB operations and #defines
tlb_ops_need_broadcast() as 0, therefore causing the usual ARM SMP TLB
operations to call the local variants instead.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
CC: Nicolas Pitre <nico@linaro.org>
      5c709e69
    • W
      ARM: nommu: add entry point for secondary CPUs to head-nommu.S · 01fafcab
      由 Will Deacon 提交于 
      This patch adds a secondary_startup entry point to head-nommu.S so that
we can boot secondary CPUs on an SMP nommu configuration.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
CC: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
CC: Nicolas Pitre <nico@linaro.org>
      01fafcab
  5. 21 5月, 2013 3 次提交
  7. 18 5月, 2013 2 次提交
  9. 17 5月, 2013 1 次提交
  11. 14 5月, 2013 4 次提交
  13. 10 5月, 2013 10 次提交
  15. 09 5月, 2013 3 次提交