linux/arch/mips/bcm47xx
Tokunori Ikegami 2a027b47db
MIPS: BCM47XX: Enable 74K Core ExternalSync for PCIe erratum
The erratum and workaround are described by BCM5300X-ES300-RDS.pdf as
below.

  R10: PCIe Transactions Periodically Fail

    Description: The BCM5300X PCIe does not maintain transaction ordering.
                 This may cause PCIe transaction failure.
    Fix Comment: Add a dummy PCIe configuration read after a PCIe
                 configuration write to ensure PCIe configuration access
                 ordering. Set ES bit of CP0 configu7 register to enable
                 sync function so that the sync instruction is functional.
    Resolution:  hndpci.c: extpci_write_config()
                 hndmips.c: si_mips_init()
                 mipsinc.h CONF7_ES

This is fixed by the CFE MIPS bcmsi chipset driver also for BCM47XX.
Also the dummy PCIe configuration read is already implemented in the
Linux BCMA driver.

Enable ExternalSync in Config7 when CONFIG_BCMA_DRIVER_PCI_HOSTMODE=y
too so that the sync instruction is externalised.

Signed-off-by: Tokunori Ikegami <ikegami@allied-telesis.co.jp>
Reviewed-by: Paul Burton <paul.burton@mips.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: Rafał Miłecki <zajec5@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/19461/
Signed-off-by: James Hogan <jhogan@kernel.org>
2018-06-18 22:19:50 +01:00
..
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile MIPS: BCM47xx: Move SPROM driver to drivers/firmware/ 2016-05-13 14:01:43 +02:00
Platform MIPS: bcm47xx: enable ZBOOT support 2018-01-24 11:20:29 +00:00
bcm47xx_private.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
board.c MIPS: BCM47XX: Add support for Netgear WNR1000 V3 2018-04-23 16:39:34 +01:00
buttons.c MIPS: BCM47XX: Add support for Netgear WNR1000 V3 2018-04-23 16:39:34 +01:00
irq.c MIPS: BCM47XX: Initialize bcma bus later (with mm available) 2014-11-24 07:45:00 +01:00
leds.c MIPS: BCM47XX: Use __initdata for the bcm47xx_leds_pdata 2018-04-23 16:44:38 +01:00
prom.c MIPS: BCM77xx: Remove legacy __cpuinit{,data} sections that crept in 2015-06-21 21:53:42 +02:00
serial.c MIPS: BCM47xx: Make serial explicitly non-modular 2016-10-04 16:13:57 +02:00
setup.c MIPS: BCM47XX: Enable 74K Core ExternalSync for PCIe erratum 2018-06-18 22:19:50 +01:00
time.c MIPS: BCM47XX: Fix coding style to match kernel standards 2015-04-01 17:22:10 +02:00
workarounds.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00