openwrtv3/target/linux/layerscape/patches-4.4/0051-PCI-designware-Ensure-ATU-is-enabled-before-IO-conf-.patch
Yutang Jiang c6c731fe31 layerscape: add 64b/32b target for ls1043ardb device
Add support for NXP layerscape ls1043ardb 64b/32b Dev board.

LS1043a is an SoC with 4x64-bit up to 1.6 GHz ARMv8 A53 cores.
ls1043ardb support features as: 2GB DDR4, 128MB NOR/512MB NAND, USB3.0, eSDHC,
I2C, GPIO, PCIe/Mini-PCIe, 6x1G/1x10G network port, etc.

64b/32b ls1043ardb target is using 4.4 kernel, and rcw/u-boot/fman images from
NXP QorIQ SDK release.

All of 4.4 kernel patches porting from SDK release or upstream.

QorIQ SDK ISOs can be downloaded from this location:
http://www.nxp.com/products/software-and-tools/run-time-software/linux-sdk/linux-sdk-for-qoriq-processors:SDKLINUX

Signed-off-by: Yutang Jiang <yutang.jiang@nxp.com>
2016-10-31 17:00:10 +01:00

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From 7f434723cdb6823443330cd4847d5c3b8dd30bd7 Mon Sep 17 00:00:00 2001
From: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Date: Fri, 18 Dec 2015 14:38:55 +0200
Subject: [PATCH 51/70] PCI: designware: Ensure ATU is enabled before IO/conf
space accesses
Read back the ATU CR2 register to ensure ATU programming is effective
before any subsequent I/O or config space accesses.
Without this, PCI device enumeration is unreliable.
[bhelgaas: changelog, comment]
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
---
drivers/pci/host/pcie-designware.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -154,6 +154,8 @@ static int dw_pcie_wr_own_conf(struct pc
static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
int type, u64 cpu_addr, u64 pci_addr, u32 size)
{
+ u32 val;
+
dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | index,
PCIE_ATU_VIEWPORT);
dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr), PCIE_ATU_LOWER_BASE);
@@ -164,6 +166,12 @@ static void dw_pcie_prog_outbound_atu(st
dw_pcie_writel_rc(pp, upper_32_bits(pci_addr), PCIE_ATU_UPPER_TARGET);
dw_pcie_writel_rc(pp, type, PCIE_ATU_CR1);
dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
+
+ /*
+ * Make sure ATU enable takes effect before any subsequent config
+ * and I/O accesses.
+ */
+ dw_pcie_readl_rc(pp, PCIE_ATU_CR2, &val);
}
static struct irq_chip dw_msi_irq_chip = {