From b0e74277164b17bb0d207ffe16056e13e558f6ba Mon Sep 17 00:00:00 2001
From: Zhao Qiang <qiang.zhao@nxp.com>
Date: Tue, 11 Oct 2016 16:25:07 +0800
Subject: [PATCH 138/141] pci-layerscape: add MSI interrupt support

Signed-off-by: Zhao Qiang <qiang.zhao@nxp.com>
---
 drivers/iommu/amd_iommu.c         |    5 +++--
 drivers/iommu/arm-smmu.c          |   21 ++++++++++++++++++
 drivers/iommu/iommu.c             |    8 +++----
 drivers/pci/host/pci-layerscape.c |   43 +++++++++++++++++++++++++++++++++++++
 drivers/pci/host/pci-layerscape.h |   17 +++++++++++++++
 drivers/pci/quirks.c              |   19 +++++++++-------
 drivers/pci/search.c              |    5 ++---
 include/linux/pci.h               |    6 +++---
 8 files changed, 104 insertions(+), 20 deletions(-)
 create mode 100644 drivers/pci/host/pci-layerscape.h

--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -222,8 +222,9 @@ static u16 get_alias(struct device *dev)
 	 */
 	if (pci_alias == devid &&
 	    PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) {
-		pdev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
-		pdev->dma_alias_devfn = ivrs_alias & 0xff;
+		pdev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVID;
+		pdev->dma_alias_devid = PCI_DEVID(pdev->bus->number,
+						  ivrs_alias & 0xff);
 		pr_info("AMD-Vi: Added PCI DMA alias %02x.%d for %s\n",
 			PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias),
 			dev_name(dev));
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -45,6 +45,10 @@
 
 #include <linux/amba/bus.h>
 
+#ifdef CONFIG_PCI_LAYERSCAPE
+#include <../drivers/pci/host/pci-layerscape.h>
+#endif
+
 #include "io-pgtable.h"
 
 /* Maximum number of stream IDs assigned to a single device */
@@ -1352,6 +1356,23 @@ static int arm_smmu_init_platform_device
 static int arm_smmu_add_device(struct device *dev)
 {
 	struct iommu_group *group;
+#ifdef CONFIG_PCI_LAYERSCAPE
+	u16 sid;
+	u32 streamid;
+	struct pci_dev *pdev;
+	if (dev_is_pci(dev)) {
+		pdev = to_pci_dev(dev);
+
+		pci_for_each_dma_alias(pdev, __arm_smmu_get_pci_sid, &sid);
+		streamid = set_pcie_streamid_translation(pdev, sid);
+		if (~streamid == 0) {
+			return -ENODEV;
+		}
+
+		pdev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVID;
+		pdev->dma_alias_devid = streamid;
+	}
+#endif
 
 	group = iommu_group_get_for_dev(dev);
 	if (IS_ERR(group))
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -697,10 +697,10 @@ static struct iommu_group *get_pci_alias
 			continue;
 
 		/* We alias them or they alias us */
-		if (((pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) &&
-		     pdev->dma_alias_devfn == tmp->devfn) ||
-		    ((tmp->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) &&
-		     tmp->dma_alias_devfn == pdev->devfn)) {
+		if (((pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVID) &&
+		     (pdev->dma_alias_devid & 0xff) == tmp->devfn) ||
+		    ((tmp->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVID) &&
+		     (tmp->dma_alias_devid & 0xff) == pdev->devfn)) {
 
 			group = get_pci_alias_group(tmp, devfns);
 			if (group) {
--- a/drivers/pci/host/pci-layerscape.c
+++ b/drivers/pci/host/pci-layerscape.c
@@ -37,6 +37,11 @@
 
 /* PEX LUT registers */
 #define PCIE_LUT_DBG		0x7FC /* PEX LUT Debug Register */
+#define PCIE_LUT_UDR(n)		(0x800 + (n) * 8)
+#define PCIE_LUT_LDR(n)		(0x804 + (n) * 8)
+#define PCIE_LUT_MASK_ALL	0xffff
+#define PCIE_LUT_DR_NUM		32
+#define PCIE_LUT_ENABLE		(1 << 31)
 
 struct ls_pcie_drvdata {
 	u32 lut_offset;
@@ -52,10 +57,30 @@ struct ls_pcie {
 	struct pcie_port pp;
 	const struct ls_pcie_drvdata *drvdata;
 	int index;
+	const u32 *avail_streamids;
+	int streamid_index;
 };
 
 #define to_ls_pcie(x)	container_of(x, struct ls_pcie, pp)
 
+u32 set_pcie_streamid_translation(struct pci_dev *pdev, u32 devid)
+{
+	u32 index, streamid;
+	struct pcie_port *pp = pdev->bus->sysdata;
+	struct ls_pcie *pcie = to_ls_pcie(pp);
+
+	if (!pcie->avail_streamids || !pcie->streamid_index)
+		return ~(u32)0;
+
+	index = --pcie->streamid_index;
+	/* mask is set as all zeroes, want to match all bits */
+	iowrite32((devid << 16), pcie->lut + PCIE_LUT_UDR(index));
+	streamid = be32_to_cpup(&pcie->avail_streamids[index]);
+	iowrite32(streamid | PCIE_LUT_ENABLE, pcie->lut + PCIE_LUT_LDR(index));
+
+	return streamid;
+}
+
 static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
 {
 	u32 header_type;
@@ -284,10 +309,28 @@ static int __init ls_pcie_probe(struct p
 
 	pcie->drvdata = match->data;
 	pcie->lut = pcie->dbi + pcie->drvdata->lut_offset;
+	/* Disable LDR zero */
+	iowrite32(0, pcie->lut + PCIE_LUT_LDR(0));
 
 	if (!ls_pcie_is_bridge(pcie))
 		return -ENODEV;
 
+	if (of_device_is_compatible(pdev->dev.of_node, "fsl,ls2085a-pcie") ||
+	of_device_is_compatible(pdev->dev.of_node, "fsl,ls2080a-pcie") ||
+	of_device_is_compatible(pdev->dev.of_node, "fsl,ls1088a-pcie")) {
+		int len;
+		const u32 *prop;
+		struct device_node *np;
+
+		np = pdev->dev.of_node;
+		prop = (u32 *)of_get_property(np, "available-stream-ids", &len);
+		if (prop) {
+			pcie->avail_streamids = prop;
+			pcie->streamid_index = len/sizeof(u32);
+		} else
+			dev_err(&pdev->dev, "PCIe endpoint partitioning not possible\n");
+	}
+
 	ret = ls_add_pcie_port(&pcie->pp, pdev);
 	if (ret < 0)
 		return ret;
--- /dev/null
+++ b/drivers/pci/host/pci-layerscape.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2015 Freescale Semiconductor.
+ *
+ * Author: Varun Sethi <Varun.Sethi@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _PCI_LAYERSCAPE_H
+#define _PCI_LAYERSCAPE_H
+
+/* function for setting up stream id to device id translation */
+u32 set_pcie_streamid_translation(struct pci_dev *pdev, u32 devid);
+
+#endif /* _PCI_LAYERSCAPE_H */
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3594,8 +3594,9 @@ int pci_dev_specific_reset(struct pci_de
 static void quirk_dma_func0_alias(struct pci_dev *dev)
 {
 	if (PCI_FUNC(dev->devfn) != 0) {
-		dev->dma_alias_devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
-		dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
+		dev->dma_alias_devid = PCI_DEVID(dev->bus->number,
+				       PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+		dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVID;
 	}
 }
 
@@ -3610,8 +3611,9 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_R
 static void quirk_dma_func1_alias(struct pci_dev *dev)
 {
 	if (PCI_FUNC(dev->devfn) != 1) {
-		dev->dma_alias_devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 1);
-		dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
+		dev->dma_alias_devid = PCI_DEVID(dev->bus->number,
+				       PCI_DEVFN(PCI_SLOT(dev->devfn), 1));
+		dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVID;
 	}
 }
 
@@ -3684,11 +3686,12 @@ static void quirk_fixed_dma_alias(struct
 
 	id = pci_match_id(fixed_dma_alias_tbl, dev);
 	if (id) {
-		dev->dma_alias_devfn = id->driver_data;
-		dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
+		dev->dma_alias_devid = PCI_DEVID(dev->bus->number,
+						 id->driver_data);
+		dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVID;
 		dev_info(&dev->dev, "Enabling fixed DMA alias to %02x.%d\n",
-			 PCI_SLOT(dev->dma_alias_devfn),
-			 PCI_FUNC(dev->dma_alias_devfn));
+			 PCI_SLOT(dev->dma_alias_devid),
+			 PCI_FUNC(dev->dma_alias_devid));
 	}
 }
 
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -40,9 +40,8 @@ int pci_for_each_dma_alias(struct pci_de
 	 * If the device is broken and uses an alias requester ID for
 	 * DMA, iterate over that too.
 	 */
-	if (unlikely(pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN)) {
-		ret = fn(pdev, PCI_DEVID(pdev->bus->number,
-					 pdev->dma_alias_devfn), data);
+	if (unlikely(pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVID)) {
+		ret = fn(pdev, pdev->dma_alias_devid, data);
 		if (ret)
 			return ret;
 	}
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -172,8 +172,8 @@ enum pci_dev_flags {
 	PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) (1 << 2),
 	/* Flag for quirk use to store if quirk-specific ACS is enabled */
 	PCI_DEV_FLAGS_ACS_ENABLED_QUIRK = (__force pci_dev_flags_t) (1 << 3),
-	/* Flag to indicate the device uses dma_alias_devfn */
-	PCI_DEV_FLAGS_DMA_ALIAS_DEVFN = (__force pci_dev_flags_t) (1 << 4),
+	/* Flag to indicate the device uses dma_alias_devid */
+	PCI_DEV_FLAGS_DMA_ALIAS_DEVID = (__force pci_dev_flags_t) (1 << 4),
 	/* Use a PCIe-to-PCI bridge alias even if !pci_is_pcie */
 	PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS = (__force pci_dev_flags_t) (1 << 5),
 	/* Do not use bus resets for device */
@@ -279,7 +279,7 @@ struct pci_dev {
 	u8		rom_base_reg;	/* which config register controls the ROM */
 	u8		pin;		/* which interrupt pin this device uses */
 	u16		pcie_flags_reg;	/* cached PCIe Capabilities Register */
-	u8		dma_alias_devfn;/* devfn of DMA alias, if any */
+	u32		dma_alias_devid;/* devid of DMA alias */
 
 	struct pci_driver *driver;	/* which driver has allocated this device */
 	u64		dma_mask;	/* Mask of the bits of bus address this
