Re: [PATCHv6 3/4] pci: layerscape: Add the EP mode support.

On Wed, Feb 20, 2019 at 03:09:01AM +0000, Xiaowei Bao wrote:

-----Original Message-----
From: Lorenzo Pieralisi <redacted> 
Sent: 2019年2月19日 19:27
To: Xiaowei Bao <redacted>
Cc: bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com; shawnguo@kernel.org; Leo Li <redacted>; kishon@ti.com; arnd@arndb.de; gregkh@linuxfoundation.org; M.h. Lian <minghuan.lian@nxp.com>; Mingkai Hu <mingkai.hu@nxp.com>; Roy Zang <roy.zang@nxp.com>; kstewart@linuxfoundation.org; cyrille.pitchen@free-electrons.com; pombredanne@nexb.com; shawn.lin@rock-chips.com; linux-pci@vger.kernel.org; devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCHv6 3/4] pci: layerscape: Add the EP mode support.

On Tue, Jan 22, 2019 at 02:33:27PM +0800, Xiaowei Bao wrote:

quoted

Add the PCIe EP mode support for layerscape platform.

Signed-off-by: Xiaowei Bao <redacted>
Reviewed-by: Minghuan Lian <minghuan.lian@nxp.com>
Reviewed-by: Zhiqiang Hou <zhiqiang.hou@nxp.com>
Reviewed-by: Kishon Vijay Abraham I <redacted>
---
depends on: 
https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpat
chwork.kernel.org%2Fproject%2Flinux-pci%2Flist%2F%3Fseries%3D66177&amp
;data=02%7C01%7Cxiaowei.bao%40nxp.com%7C6f8772ba47c74d8ee0aa08d6965d3e
b4%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C636861724572611193&amp
;sdata=b3Acj0fu7c9vSoHe9VzeAkEMbMkpyfYPsXtf6fA8Flk%3D&amp;reserved=0

v2:
 - remove the EP mode check function.
v3:
 - modif the return value when enter default case.
v4:
 - no change.
v5:
 - no change.
v6:
 - modify the code base on the submit patch of the EP framework.

Can I apply this series to my pci/endpoint branch (where I queued Kishon's EP features rework patches) ? Can you check please ?
[Xiaowei Bao] of course, in my patch, I found a compile warning, but
this series patch have approved by you, I don't know how to do, the
compile warning: " struct pci_epc *epc = ep->epc;" in
"ls_pcie_ep_init" function, I am so sorry, could you help me remove
this code, thanks a lot.

If you want me to apply your patches you need to rebase them against
my pci/endpoint branch and make sure the code is correct, I have
applied your previous series but as you know it failed because it
depends on Kishon's clean-up series.

So rebase your code against my pci/endpoint branch, make sure it
compiles with no warnings, test it and send a v7.

Thanks,
Lorenzo

Thanks,
Lorenzo

quoted

 drivers/pci/controller/dwc/Makefile            |    2 +-
 drivers/pci/controller/dwc/pci-layerscape-ep.c |  157 
++++++++++++++++++++++++
 2 files changed, 158 insertions(+), 1 deletions(-)  create mode 
100644 drivers/pci/controller/dwc/pci-layerscape-ep.c

diff --git a/drivers/pci/controller/dwc/Makefile 

b/drivers/pci/controller/dwc/Makefile
index 7bcdcdf..b5f3b83 100644

--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile

@@ -8,7 +8,7 @@ obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
 obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
 obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
 obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone.o
-obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o pci-layerscape-ep.o
 obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
 obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o diff --git 

a/drivers/pci/controller/dwc/pci-layerscape-ep.c 
b/drivers/pci/controller/dwc/pci-layerscape-ep.c
new file mode 100644
index 0000000..ddc2dbb

--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c

@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe controller EP driver for Freescale Layerscape SoCs
+ *
+ * Copyright (C) 2018 NXP Semiconductor.
+ *
+ * Author: Xiaowei Bao <xiaowei.bao@nxp.com>  */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include "pcie-designware.h"
+
+#define PCIE_DBI2_OFFSET		0x1000	/* DBI2 base address*/
+
+struct ls_pcie_ep {
+	struct dw_pcie		*pci;
+};
+
+#define to_ls_pcie_ep(x)	dev_get_drvdata((x)->dev)
+
+static int ls_pcie_establish_link(struct dw_pcie *pci) {
+	return 0;
+}
+
+static const struct dw_pcie_ops ls_pcie_ep_ops = {
+	.start_link = ls_pcie_establish_link, };
+
+static const struct of_device_id ls_pcie_ep_of_match[] = {
+	{ .compatible = "fsl,ls-pcie-ep",},
+	{ },
+};
+
+static const struct pci_epc_features ls_pcie_epc_features = {
+	.linkup_notifier = false,
+	.msi_capable = true,
+	.msix_capable = false,
+};
+
+static const struct pci_epc_features* ls_pcie_ep_get_features(struct 
+dw_pcie_ep *ep) {
+	return &ls_pcie_epc_features;
+}
+
+static void ls_pcie_ep_init(struct dw_pcie_ep *ep) {
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct pci_epc *epc = ep->epc;
+	enum pci_barno bar;
+
+	for (bar = BAR_0; bar <= BAR_5; bar++)
+		dw_pcie_ep_reset_bar(pci, bar);
+}
+
+static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+				  enum pci_epc_irq_type type, u16 interrupt_num) {
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+
+	switch (type) {
+	case PCI_EPC_IRQ_LEGACY:
+		return dw_pcie_ep_raise_legacy_irq(ep, func_no);
+	case PCI_EPC_IRQ_MSI:
+		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+	case PCI_EPC_IRQ_MSIX:
+		return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
+	default:
+		dev_err(pci->dev, "UNKNOWN IRQ type\n");
+		return -EINVAL;
+	}
+}
+
+static struct dw_pcie_ep_ops pcie_ep_ops = {
+	.ep_init = ls_pcie_ep_init,
+	.raise_irq = ls_pcie_ep_raise_irq,
+	.get_features = ls_pcie_ep_get_features, };
+
+static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie,
+					struct platform_device *pdev)
+{
+	struct dw_pcie *pci = pcie->pci;
+	struct device *dev = pci->dev;
+	struct dw_pcie_ep *ep;
+	struct resource *res;
+	int ret;
+
+	ep = &pci->ep;
+	ep->ops = &pcie_ep_ops;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
+	if (!res)
+		return -EINVAL;
+
+	ep->phys_base = res->start;
+	ep->addr_size = resource_size(res);
+
+	ret = dw_pcie_ep_init(ep);
+	if (ret) {
+		dev_err(dev, "failed to initialize endpoint\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __init ls_pcie_ep_probe(struct platform_device *pdev) {
+	struct device *dev = &pdev->dev;
+	struct dw_pcie *pci;
+	struct ls_pcie_ep *pcie;
+	struct resource *dbi_base;
+	int ret;
+
+	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
+	if (!pci)
+		return -ENOMEM;
+
+	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
+	if (IS_ERR(pci->dbi_base))
+		return PTR_ERR(pci->dbi_base);
+
+	pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
+	pci->dev = dev;
+	pci->ops = &ls_pcie_ep_ops;
+	pcie->pci = pci;
+
+	platform_set_drvdata(pdev, pcie);
+
+	ret = ls_add_pcie_ep(pcie, pdev);
+
+	return ret;
+}
+
+static struct platform_driver ls_pcie_ep_driver = {
+	.driver = {
+		.name = "layerscape-pcie-ep",
+		.of_match_table = ls_pcie_ep_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);
--

1.7.1

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