[PATCH v3 0/7] PCI: dwc: miscellaneous fixes and cleanups

[PATCH v3 0/7] PCI: dwc: miscellaneous fixes and cleanups

[Kishon Vijay Abraham I]

This should be the final set of cleanups/fixes before endpoint
support can be merged.

Keerthy's patch is a general fix in dra7xx driver and is not
directly related to endpoint mode.

This v1 of this series was previously sent with a different
cover letter $subject [1]

Changes from v2:
*) Kconfig changes that was spilled into a patch is removed.
*) In addition to renaming _unroll() to _ob_unroll(), all the
   _unroll configurations is also moved a separate function.

Changes from v1:
*) included a patch to rename _unroll() to _ob_unroll() as
   similar thing has to be done for inbound window in the case
   of EP mode.
*) used 'size_t' instead of 'int' for specifying the size
   in read_dbi/write_dbi function arguments.
*) Populate cpu_addr_fixup ops for artpec6 as suggested by
   Niklas

This series is based on 4.11-rc1

[1] -> https://lkml.org/lkml/2017/2/16/270

Keerthy (1):
  PCI: dwc: dra7xx: Push request_irq call to the bottom of probe

Kishon Vijay Abraham I (6):
  PCI: dwc: designware: Add new *ops* for cpu addr fixup
  PCI: dwc: dra7xx: Populate cpu_addr_fixup ops
  PCI: dwc: artpec6: Populate cpu_addr_fixup ops
  PCI: dwc: all: Modify dbi accessors to take dbi_base as argument
  PCI: dwc: all: Modify dbi accessors to access data of 4/2/1  bytes
  PCI: dwc: designware: Move _unroll configurations to a separate
    function

 drivers/pci/dwc/pci-dra7xx.c           |   35 +++----
 drivers/pci/dwc/pci-exynos.c           |   14 +--
 drivers/pci/dwc/pci-imx6.c             |   62 +++++++------
 drivers/pci/dwc/pci-keystone-dw.c      |   16 ++--
 drivers/pci/dwc/pcie-armada8k.c        |   39 ++++----
 drivers/pci/dwc/pcie-artpec6.c         |   22 +++--
 drivers/pci/dwc/pcie-designware-host.c |   20 ++--
 drivers/pci/dwc/pcie-designware.c      |  156 +++++++++++++++++++++-----------
 drivers/pci/dwc/pcie-designware.h      |   13 ++-
 drivers/pci/dwc/pcie-hisi.c            |   17 ++--
 10 files changed, 241 insertions(+), 153 deletions(-)

-- 
1.7.9.5

[PATCH v3 1/7] PCI: dwc: designware: Add new *ops* for cpu addr fixup

[Kishon Vijay Abraham I]

Some platforms (like dra7xx) require only the least 28 bits of the
corresponding 32 bit CPU address to be programmed in the address
translation unit. This modified address is stored in io_base/mem_base/
cfg0_base/cfg1_base in dra7xx_pcie_host_init. While this is okay for
host mode where the address range is fixed, device mode requires
different addresses to be programmed based on the host buffer address.
Add a new ops to get the least 28 bits of the corresponding 32 bit
CPU address and invoke it before programming the address translation
unit.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pcie-designware.c |    3 +++
 drivers/pci/dwc/pcie-designware.h |    1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index 7e1fb7d..14ee7a3 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -97,6 +97,9 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 {
 	u32 retries, val;
 
+	if (pp->ops->cpu_addr_fixup)
+		cpu_addr = pp->ops->cpu_addr_fixup(cpu_addr);
+
 	if (pci->iatu_unroll_enabled) {
 		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
 				      lower_32_bits(cpu_addr));
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index cd3b871..8f3dcb2 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -143,6 +143,7 @@ struct pcie_port {
 };
 
 struct dw_pcie_ops {
+	u64	(*cpu_addr_fixup)(u64 cpu_addr);
 	u32	(*readl_dbi)(struct dw_pcie *pcie, u32 reg);
 	void	(*writel_dbi)(struct dw_pcie *pcie, u32 reg, u32 val);
 	int	(*link_up)(struct dw_pcie *pcie);
-- 
1.7.9.5

[PATCH v3 2/7] PCI: dwc: dra7xx: Populate cpu_addr_fixup ops

[Kishon Vijay Abraham I]

Populate cpu_addr_fixup ops to extract the least 28 bits of the
corresponding cpu address.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pci-dra7xx.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 0984baf..07c45ec 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -88,6 +88,11 @@ static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
 	writel(value, pcie->base + offset);
 }
 
+static u64 dra7xx_pcie_cpu_addr_fixup(u64 pci_addr)
+{
+	return pci_addr & DRA7XX_CPU_TO_BUS_ADDR;
+}
+
 static int dra7xx_pcie_link_up(struct dw_pcie *pci)
 {
 	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
@@ -152,11 +157,6 @@ static void dra7xx_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
 
-	pp->io_base &= DRA7XX_CPU_TO_BUS_ADDR;
-	pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR;
-	pp->cfg0_base &= DRA7XX_CPU_TO_BUS_ADDR;
-	pp->cfg1_base &= DRA7XX_CPU_TO_BUS_ADDR;
-
 	dw_pcie_setup_rc(pp);
 
 	dra7xx_pcie_establish_link(dra7xx);
@@ -329,6 +329,7 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
 }
 
 static const struct dw_pcie_ops dw_pcie_ops = {
+	.cpu_addr_fixup = dra7xx_pcie_cpu_addr_fixup,
 	.link_up = dra7xx_pcie_link_up,
 };
 
-- 
1.7.9.5

[PATCH v3 3/7] PCI: dwc: artpec6: Populate cpu_addr_fixup ops

[Kishon Vijay Abraham I]

Populate cpu_addr_fixup ops to extract the least 28 bits of the
corresponding cpu address.

Cc: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pcie-artpec6.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index fcd3ef8..5b3b3af 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -78,6 +78,11 @@ static void artpec6_pcie_writel(struct artpec6_pcie *artpec6_pcie, u32 offset, u
 	regmap_write(artpec6_pcie->regmap, offset, val);
 }
 
+static u64 artpec6_pcie_cpu_addr_fixup(u64 pci_addr)
+{
+	return pci_addr & ARTPEC6_CPU_TO_BUS_ADDR;
+}
+
 static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 {
 	struct dw_pcie *pci = artpec6_pcie->pci;
@@ -142,11 +147,6 @@ static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 	 */
 	dw_pcie_writel_dbi(pci, MISC_CONTROL_1_OFF, DBI_RO_WR_EN);
 
-	pp->io_base &= ARTPEC6_CPU_TO_BUS_ADDR;
-	pp->mem_base &= ARTPEC6_CPU_TO_BUS_ADDR;
-	pp->cfg0_base &= ARTPEC6_CPU_TO_BUS_ADDR;
-	pp->cfg1_base &= ARTPEC6_CPU_TO_BUS_ADDR;
-
 	/* setup root complex */
 	dw_pcie_setup_rc(pp);
 
@@ -234,6 +234,10 @@ static int artpec6_add_pcie_port(struct artpec6_pcie *artpec6_pcie,
 	return 0;
 }
 
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.cpu_addr_fixup = artpec6_pcie_cpu_addr_fixup,
+};
+
 static int artpec6_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -252,6 +256,7 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	pci->dev = dev;
+	pci->ops = &dw_pcie_ops;
 
 	artpec6_pcie->pci = pci;
 
-- 
1.7.9.5

[PATCH v3 4/7] PCI: dwc: all: Modify dbi accessors to take dbi_base as argument

[Kishon Vijay Abraham I]

dwc has 2 dbi address space labeled dbics and dbics2. The existing
helper to access dbi address space can access only dbics. However
dbics2 has to be accessed for programming the BAR registers in the
case of EP mode. This is in preparation for adding EP mode support
to dwc driver.

Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Niklas Cassel <niklas.cassel@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Joao Pinto <Joao.Pinto@synopsys.com>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pci-dra7xx.c           |   10 +++--
 drivers/pci/dwc/pci-exynos.c           |   10 +++--
 drivers/pci/dwc/pci-imx6.c             |   62 +++++++++++++++-----------
 drivers/pci/dwc/pci-keystone-dw.c      |   15 ++++---
 drivers/pci/dwc/pcie-armada8k.c        |   39 +++++++++-------
 drivers/pci/dwc/pcie-artpec6.c         |    7 +--
 drivers/pci/dwc/pcie-designware-host.c |   20 +++++----
 drivers/pci/dwc/pcie-designware.c      |   76 ++++++++++++++++++--------------
 drivers/pci/dwc/pcie-designware.h      |   10 +++--
 drivers/pci/dwc/pcie-hisi.c            |   17 ++++---
 10 files changed, 152 insertions(+), 114 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 07c45ec..3708bd6 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -495,12 +495,13 @@ static int dra7xx_pcie_suspend(struct device *dev)
 {
 	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
 	struct dw_pcie *pci = dra7xx->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val;
 
 	/* clear MSE */
-	val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
+	val = dw_pcie_readl_dbi(pci, base, PCI_COMMAND);
 	val &= ~PCI_COMMAND_MEMORY;
-	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
+	dw_pcie_writel_dbi(pci, base, PCI_COMMAND, val);
 
 	return 0;
 }
@@ -509,12 +510,13 @@ static int dra7xx_pcie_resume(struct device *dev)
 {
 	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
 	struct dw_pcie *pci = dra7xx->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val;
 
 	/* set MSE */
-	val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
+	val = dw_pcie_readl_dbi(pci, base, PCI_COMMAND);
 	val |= PCI_COMMAND_MEMORY;
-	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
+	dw_pcie_writel_dbi(pci, base, PCI_COMMAND, val);
 
 	return 0;
 }
diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
index 993b650..a0d40f7 100644
--- a/drivers/pci/dwc/pci-exynos.c
+++ b/drivers/pci/dwc/pci-exynos.c
@@ -521,23 +521,25 @@ static void exynos_pcie_enable_interrupts(struct exynos_pcie *ep)
 		exynos_pcie_msi_init(ep);
 }
 
-static u32 exynos_pcie_readl_dbi(struct dw_pcie *pci, u32 reg)
+static u32 exynos_pcie_readl_dbi(struct dw_pcie *pci, void __iomem *base,
+				 u32 reg)
 {
 	struct exynos_pcie *ep = to_exynos_pcie(pci);
 	u32 val;
 
 	exynos_pcie_sideband_dbi_r_mode(ep, true);
-	val = readl(pci->dbi_base + reg);
+	val = readl(base + reg);
 	exynos_pcie_sideband_dbi_r_mode(ep, false);
 	return val;
 }
 
-static void exynos_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
+static void exynos_pcie_writel_dbi(struct dw_pcie *pci, void __iomem *base,
+				   u32 reg, u32 val)
 {
 	struct exynos_pcie *ep = to_exynos_pcie(pci);
 
 	exynos_pcie_sideband_dbi_w_mode(ep, true);
-	writel(val, pci->dbi_base + reg);
+	writel(val, base + reg);
 	exynos_pcie_sideband_dbi_w_mode(ep, false);
 }
 
diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c
index 801e46c..85dd901 100644
--- a/drivers/pci/dwc/pci-imx6.c
+++ b/drivers/pci/dwc/pci-imx6.c
@@ -98,12 +98,13 @@ struct imx6_pcie {
 static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, int exp_val)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val;
 	u32 max_iterations = 10;
 	u32 wait_counter = 0;
 
 	do {
-		val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
+		val = dw_pcie_readl_dbi(pci, base, PCIE_PHY_STAT);
 		val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
 		wait_counter++;
 
@@ -119,21 +120,22 @@ static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, int exp_val)
 static int pcie_phy_wait_ack(struct imx6_pcie *imx6_pcie, int addr)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val;
 	int ret;
 
 	val = addr << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, val);
 
 	val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, val);
 
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
 	if (ret)
 		return ret;
 
 	val = addr << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, val);
 
 	return pcie_phy_poll_ack(imx6_pcie, 0);
 }
@@ -142,6 +144,7 @@ static int pcie_phy_wait_ack(struct imx6_pcie *imx6_pcie, int addr)
 static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, int *data)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val, phy_ctl;
 	int ret;
 
@@ -151,17 +154,17 @@ static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, int *data)
 
 	/* assert Read signal */
 	phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, phy_ctl);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, phy_ctl);
 
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
 	if (ret)
 		return ret;
 
-	val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
+	val = dw_pcie_readl_dbi(pci, base, PCIE_PHY_STAT);
 	*data = val & 0xffff;
 
 	/* deassert Read signal */
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x00);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, 0x00);
 
 	return pcie_phy_poll_ack(imx6_pcie, 0);
 }
@@ -169,6 +172,7 @@ static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, int *data)
 static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 var;
 	int ret;
 
@@ -179,11 +183,11 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 		return ret;
 
 	var = data << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
 
 	/* capture data */
 	var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
 
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
 	if (ret)
@@ -191,7 +195,7 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 
 	/* deassert cap data */
 	var = data << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
 
 	/* wait for ack de-assertion */
 	ret = pcie_phy_poll_ack(imx6_pcie, 0);
@@ -200,7 +204,7 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 
 	/* assert wr signal */
 	var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
 
 	/* wait for ack */
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
@@ -209,14 +213,14 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 
 	/* deassert wr signal */
 	var = data << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
 
 	/* wait for ack de-assertion */
 	ret = pcie_phy_poll_ack(imx6_pcie, 0);
 	if (ret)
 		return ret;
 
-	dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x0);
+	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, 0x0);
 
 	return 0;
 }
@@ -411,6 +415,7 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
 static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	struct device *dev = pci->dev;
 
 	/* check if the link is up or not */
@@ -418,20 +423,22 @@ static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie)
 		return 0;
 
 	dev_dbg(dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
-		dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R0),
-		dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1));
+		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R0),
+		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1));
 	return -ETIMEDOUT;
 }
 
 static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	struct device *dev = pci->dev;
 	u32 tmp;
 	unsigned int retries;
 
 	for (retries = 0; retries < 200; retries++) {
-		tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
+		tmp = dw_pcie_readl_dbi(pci, base,
+					PCIE_LINK_WIDTH_SPEED_CONTROL);
 		/* Test if the speed change finished. */
 		if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
 			return 0;
@@ -454,6 +461,7 @@ static irqreturn_t imx6_pcie_msi_handler(int irq, void *arg)
 static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	struct device *dev = pci->dev;
 	u32 tmp;
 	int ret;
@@ -463,10 +471,10 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 	 * started in Gen2 mode, there is a possibility the devices on the
 	 * bus will not be detected at all.  This happens with PCIe switches.
 	 */
-	tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCR);
+	tmp = dw_pcie_readl_dbi(pci, base, PCIE_RC_LCR);
 	tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
 	tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1;
-	dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
+	dw_pcie_writel_dbi(pci, base, PCIE_RC_LCR, tmp);
 
 	/* Start LTSSM. */
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -478,10 +486,10 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 
 	if (imx6_pcie->link_gen == 2) {
 		/* Allow Gen2 mode after the link is up. */
-		tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCR);
+		tmp = dw_pcie_readl_dbi(pci, base, PCIE_RC_LCR);
 		tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
 		tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2;
-		dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
+		dw_pcie_writel_dbi(pci, base, PCIE_RC_LCR, tmp);
 	} else {
 		dev_info(dev, "Link: Gen2 disabled\n");
 	}
@@ -490,9 +498,9 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 	 * Start Directed Speed Change so the best possible speed both link
 	 * partners support can be negotiated.
 	 */
-	tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
+	tmp = dw_pcie_readl_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL);
 	tmp |= PORT_LOGIC_SPEED_CHANGE;
-	dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
+	dw_pcie_writel_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
 
 	ret = imx6_pcie_wait_for_speed_change(imx6_pcie);
 	if (ret) {
@@ -507,14 +515,14 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 		goto err_reset_phy;
 	}
 
-	tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCSR);
+	tmp = dw_pcie_readl_dbi(pci, base, PCIE_RC_LCSR);
 	dev_info(dev, "Link up, Gen%i\n", (tmp >> 16) & 0xf);
 	return 0;
 
 err_reset_phy:
 	dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
-		dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R0),
-		dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1));
+		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R0),
+		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1));
 	imx6_pcie_reset_phy(imx6_pcie);
 	return ret;
 }
@@ -536,7 +544,9 @@ static void imx6_pcie_host_init(struct pcie_port *pp)
 
 static int imx6_pcie_link_up(struct dw_pcie *pci)
 {
-	return dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1) &
+	void __iomem *base = pci->dbi_base;
+
+	return dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1) &
 			PCIE_PHY_DEBUG_R1_XMLH_LINK_UP;
 }
 
diff --git a/drivers/pci/dwc/pci-keystone-dw.c b/drivers/pci/dwc/pci-keystone-dw.c
index 6b396f6..7220c04 100644
--- a/drivers/pci/dwc/pci-keystone-dw.c
+++ b/drivers/pci/dwc/pci-keystone-dw.c
@@ -378,6 +378,7 @@ static void ks_dw_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie)
 void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
 {
 	struct dw_pcie *pci = ks_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	struct pcie_port *pp = &pci->pp;
 	u32 start = pp->mem->start, end = pp->mem->end;
 	int i, tr_size;
@@ -385,8 +386,8 @@ void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
 
 	/* Disable BARs for inbound access */
 	ks_dw_pcie_set_dbi_mode(ks_pcie);
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, 0);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_1, 0);
 	ks_dw_pcie_clear_dbi_mode(ks_pcie);
 
 	/* Set outbound translation size per window division */
@@ -482,14 +483,15 @@ int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	void __iomem *base = pci->dbi_base;
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
 
 	/* Configure and set up BAR0 */
 	ks_dw_pcie_set_dbi_mode(ks_pcie);
 
 	/* Enable BAR0 */
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, 1);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, SZ_4K - 1);
 
 	ks_dw_pcie_clear_dbi_mode(ks_pcie);
 
@@ -497,7 +499,7 @@ void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
 	  * For BAR0, just setting bus address for inbound writes (MSI) should
 	  * be sufficient.  Use physical address to avoid any conflicts.
 	  */
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
 }
 
 /**
@@ -506,8 +508,9 @@ void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
 int ks_dw_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 val;
+	void __iomem *base = pci->dbi_base;
 
-	val = dw_pcie_readl_dbi(pci, DEBUG0);
+	val = dw_pcie_readl_dbi(pci, base, DEBUG0);
 	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
 }
 
diff --git a/drivers/pci/dwc/pcie-armada8k.c b/drivers/pci/dwc/pcie-armada8k.c
index f110e3b..b2328df 100644
--- a/drivers/pci/dwc/pcie-armada8k.c
+++ b/drivers/pci/dwc/pcie-armada8k.c
@@ -73,8 +73,9 @@ static int armada8k_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 reg;
 	u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
+	void __iomem *base = pci->dbi_base;
 
-	reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_STATUS_REG);
+	reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_STATUS_REG);
 
 	if ((reg & mask) == mask)
 		return 1;
@@ -86,47 +87,50 @@ static int armada8k_pcie_link_up(struct dw_pcie *pci)
 static void armada8k_pcie_establish_link(struct armada8k_pcie *pcie)
 {
 	struct dw_pcie *pci = pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 reg;
 
 	if (!dw_pcie_link_up(pci)) {
 		/* Disable LTSSM state machine to enable configuration */
-		reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
+		reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG);
 		reg &= ~(PCIE_APP_LTSSM_EN);
-		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
+		dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, reg);
 	}
 
 	/* Set the device to root complex mode */
-	reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
+	reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG);
 	reg &= ~(PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_SHIFT);
 	reg |= PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_SHIFT;
-	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
+	dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, reg);
 
 	/* Set the PCIe master AxCache attributes */
-	dw_pcie_writel_dbi(pci, PCIE_ARCACHE_TRC_REG, ARCACHE_DEFAULT_VALUE);
-	dw_pcie_writel_dbi(pci, PCIE_AWCACHE_TRC_REG, AWCACHE_DEFAULT_VALUE);
+	dw_pcie_writel_dbi(pci, base, PCIE_ARCACHE_TRC_REG,
+			   ARCACHE_DEFAULT_VALUE);
+	dw_pcie_writel_dbi(pci, base, PCIE_AWCACHE_TRC_REG,
+			   AWCACHE_DEFAULT_VALUE);
 
 	/* Set the PCIe master AxDomain attributes */
-	reg = dw_pcie_readl_dbi(pci, PCIE_ARUSER_REG);
+	reg = dw_pcie_readl_dbi(pci, base, PCIE_ARUSER_REG);
 	reg &= ~(AX_USER_DOMAIN_MASK << AX_USER_DOMAIN_SHIFT);
 	reg |= DOMAIN_OUTER_SHAREABLE << AX_USER_DOMAIN_SHIFT;
-	dw_pcie_writel_dbi(pci, PCIE_ARUSER_REG, reg);
+	dw_pcie_writel_dbi(pci, base, PCIE_ARUSER_REG, reg);
 
-	reg = dw_pcie_readl_dbi(pci, PCIE_AWUSER_REG);
+	reg = dw_pcie_readl_dbi(pci, base, PCIE_AWUSER_REG);
 	reg &= ~(AX_USER_DOMAIN_MASK << AX_USER_DOMAIN_SHIFT);
 	reg |= DOMAIN_OUTER_SHAREABLE << AX_USER_DOMAIN_SHIFT;
-	dw_pcie_writel_dbi(pci, PCIE_AWUSER_REG, reg);
+	dw_pcie_writel_dbi(pci, base, PCIE_AWUSER_REG, reg);
 
 	/* Enable INT A-D interrupts */
-	reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG);
+	reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_INT_MASK1_REG);
 	reg |= PCIE_INT_A_ASSERT_MASK | PCIE_INT_B_ASSERT_MASK |
 	       PCIE_INT_C_ASSERT_MASK | PCIE_INT_D_ASSERT_MASK;
-	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG, reg);
+	dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_INT_MASK1_REG, reg);
 
 	if (!dw_pcie_link_up(pci)) {
 		/* Configuration done. Start LTSSM */
-		reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
+		reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG);
 		reg |= PCIE_APP_LTSSM_EN;
-		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
+		dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, reg);
 	}
 
 	/* Wait until the link becomes active again */
@@ -147,6 +151,7 @@ static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
 {
 	struct armada8k_pcie *pcie = arg;
 	struct dw_pcie *pci = pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val;
 
 	/*
@@ -154,8 +159,8 @@ static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
 	 * PCI device. However, they are also latched into the PCIe
 	 * controller, so we simply discard them.
 	 */
-	val = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_INT_CAUSE1_REG);
-	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_CAUSE1_REG, val);
+	val = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_INT_CAUSE1_REG);
+	dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_INT_CAUSE1_REG, val);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index 5b3b3af..e3ba11c 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -86,6 +86,7 @@ static u64 artpec6_pcie_cpu_addr_fixup(u64 pci_addr)
 static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 {
 	struct dw_pcie *pci = artpec6_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	struct pcie_port *pp = &pci->pp;
 	u32 val;
 	unsigned int retries;
@@ -145,7 +146,7 @@ static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 	 * Enable writing to config regs. This is required as the Synopsys
 	 * driver changes the class code. That register needs DBI write enable.
 	 */
-	dw_pcie_writel_dbi(pci, MISC_CONTROL_1_OFF, DBI_RO_WR_EN);
+	dw_pcie_writel_dbi(pci, base, MISC_CONTROL_1_OFF, DBI_RO_WR_EN);
 
 	/* setup root complex */
 	dw_pcie_setup_rc(pp);
@@ -160,8 +161,8 @@ static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 		return 0;
 
 	dev_dbg(pci->dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
-		dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R0),
-		dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1));
+		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R0),
+		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1));
 
 	return -ETIMEDOUT;
 }
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 5ba3349..9df620d 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -566,8 +566,9 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
 {
 	u32 val;
+	void __iomem *base = pci->dbi_base;
 
-	val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
+	val = dw_pcie_readl_dbi(pci, base, PCIE_ATU_VIEWPORT);
 	if (val == 0xffffffff)
 		return 1;
 
@@ -578,31 +579,32 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 {
 	u32 val;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	void __iomem *base = pci->dbi_base;
 
 	dw_pcie_setup(pci);
 
 	/* setup RC BARs */
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
-	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x00000004);
+	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_1, 0x00000000);
 
 	/* setup interrupt pins */
-	val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
+	val = dw_pcie_readl_dbi(pci, base, PCI_INTERRUPT_LINE);
 	val &= 0xffff00ff;
 	val |= 0x00000100;
-	dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
+	dw_pcie_writel_dbi(pci, base, PCI_INTERRUPT_LINE, val);
 
 	/* setup bus numbers */
-	val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
+	val = dw_pcie_readl_dbi(pci, base, PCI_PRIMARY_BUS);
 	val &= 0xff000000;
 	val |= 0x00010100;
-	dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
+	dw_pcie_writel_dbi(pci, base, PCI_PRIMARY_BUS, val);
 
 	/* setup command register */
-	val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
+	val = dw_pcie_readl_dbi(pci, base, PCI_COMMAND);
 	val &= 0xffff0000;
 	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
 		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
-	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
+	dw_pcie_writel_dbi(pci, base, PCI_COMMAND, val);
 
 	/*
 	 * If the platform provides ->rd_other_conf, it means the platform
diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index 14ee7a3..f8eaeea 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -61,75 +61,82 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val)
 	return PCIBIOS_SUCCESSFUL;
 }
 
-u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg)
+u32 dw_pcie_readl_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg)
 {
 	if (pci->ops->readl_dbi)
-		return pci->ops->readl_dbi(pci, reg);
+		return pci->ops->readl_dbi(pci, base, reg);
 
-	return readl(pci->dbi_base + reg);
+	return readl(base + reg);
 }
 
-void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
+void dw_pcie_writel_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
+			u32 val)
 {
 	if (pci->ops->writel_dbi)
-		pci->ops->writel_dbi(pci, reg, val);
+		pci->ops->writel_dbi(pci, base, reg, val);
 	else
-		writel(val, pci->dbi_base + reg);
+		writel(val, base + reg);
 }
 
-static u32 dw_pcie_readl_unroll(struct dw_pcie *pci, u32 index, u32 reg)
+static u32 dw_pcie_readl_unroll(struct dw_pcie *pci, void __iomem *base,
+				u32 index, u32 reg)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
 
-	return dw_pcie_readl_dbi(pci, offset + reg);
+	return dw_pcie_readl_dbi(pci, base, offset + reg);
 }
 
-static void dw_pcie_writel_unroll(struct dw_pcie *pci, u32 index, u32 reg,
-				  u32 val)
+static void dw_pcie_writel_unroll(struct dw_pcie *pci, void __iomem *base,
+				  u32 index, u32 reg, u32 val)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
 
-	dw_pcie_writel_dbi(pci, offset + reg, val);
+	dw_pcie_writel_dbi(pci, base, offset + reg, val);
 }
 
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 			       u64 cpu_addr, u64 pci_addr, u32 size)
 {
 	u32 retries, val;
+	void __iomem *base = pci->dbi_base;
 
-	if (pp->ops->cpu_addr_fixup)
-		cpu_addr = pp->ops->cpu_addr_fixup(cpu_addr);
+	if (pci->ops->cpu_addr_fixup)
+		cpu_addr = pci->ops->cpu_addr_fixup(cpu_addr);
 
 	if (pci->iatu_unroll_enabled) {
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
+		dw_pcie_writel_unroll(pci, base, index, PCIE_ATU_UNR_LOWER_BASE,
 				      lower_32_bits(cpu_addr));
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
+		dw_pcie_writel_unroll(pci, base, index, PCIE_ATU_UNR_UPPER_BASE,
 				      upper_32_bits(cpu_addr));
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
+		dw_pcie_writel_unroll(pci, base, index, PCIE_ATU_UNR_LIMIT,
 				      lower_32_bits(cpu_addr + size - 1));
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
+		dw_pcie_writel_unroll(pci, base, index,
+				      PCIE_ATU_UNR_LOWER_TARGET,
 				      lower_32_bits(pci_addr));
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
+		dw_pcie_writel_unroll(pci, base, index,
+				      PCIE_ATU_UNR_UPPER_TARGET,
 				      upper_32_bits(pci_addr));
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
+		dw_pcie_writel_unroll(pci, base, index,
+				      PCIE_ATU_UNR_REGION_CTRL1,
 				      type);
-		dw_pcie_writel_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
+		dw_pcie_writel_unroll(pci, base, index,
+				      PCIE_ATU_UNR_REGION_CTRL2,
 				      PCIE_ATU_ENABLE);
 	} else {
-		dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT,
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_VIEWPORT,
 				   PCIE_ATU_REGION_OUTBOUND | index);
-		dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_BASE,
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_LOWER_BASE,
 				   lower_32_bits(cpu_addr));
-		dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_BASE,
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_UPPER_BASE,
 				   upper_32_bits(cpu_addr));
-		dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT,
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_LIMIT,
 				   lower_32_bits(cpu_addr + size - 1));
-		dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET,
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_LOWER_TARGET,
 				   lower_32_bits(pci_addr));
-		dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET,
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_UPPER_TARGET,
 				   upper_32_bits(pci_addr));
-		dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
-		dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE);
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_CR1, type);
+		dw_pcie_writel_dbi(pci, base, PCIE_ATU_CR2, PCIE_ATU_ENABLE);
 	}
 
 	/*
@@ -138,10 +145,10 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 	 */
 	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
 		if (pci->iatu_unroll_enabled)
-			val = dw_pcie_readl_unroll(pci, index,
+			val = dw_pcie_readl_unroll(pci, base, index,
 						   PCIE_ATU_UNR_REGION_CTRL2);
 		else
-			val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
+			val = dw_pcie_readl_dbi(pci, base, PCIE_ATU_CR2);
 
 		if (val == PCIE_ATU_ENABLE)
 			return;
@@ -188,13 +195,14 @@ void dw_pcie_setup(struct dw_pcie *pci)
 	u32 lanes;
 	struct device *dev = pci->dev;
 	struct device_node *np = dev->of_node;
+	void __iomem *base = pci->dbi_base;
 
 	ret = of_property_read_u32(np, "num-lanes", &lanes);
 	if (ret)
 		lanes = 0;
 
 	/* set the number of lanes */
-	val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
+	val = dw_pcie_readl_dbi(pci, base, PCIE_PORT_LINK_CONTROL);
 	val &= ~PORT_LINK_MODE_MASK;
 	switch (lanes) {
 	case 1:
@@ -213,10 +221,10 @@ void dw_pcie_setup(struct dw_pcie *pci)
 		dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes);
 		return;
 	}
-	dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
+	dw_pcie_writel_dbi(pci, base, PCIE_PORT_LINK_CONTROL, val);
 
 	/* set link width speed control register */
-	val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
+	val = dw_pcie_readl_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL);
 	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
 	switch (lanes) {
 	case 1:
@@ -232,5 +240,5 @@ void dw_pcie_setup(struct dw_pcie *pci)
 		val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
 		break;
 	}
-	dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
+	dw_pcie_writel_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
 }
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index 8f3dcb2..fe93f7f 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -144,8 +144,9 @@ struct pcie_port {
 
 struct dw_pcie_ops {
 	u64	(*cpu_addr_fixup)(u64 cpu_addr);
-	u32	(*readl_dbi)(struct dw_pcie *pcie, u32 reg);
-	void	(*writel_dbi)(struct dw_pcie *pcie, u32 reg, u32 val);
+	u32	(*readl_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg);
+	void	(*writel_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
+			      u32 val);
 	int	(*link_up)(struct dw_pcie *pcie);
 };
 
@@ -163,8 +164,9 @@ struct dw_pcie {
 int dw_pcie_read(void __iomem *addr, int size, u32 *val);
 int dw_pcie_write(void __iomem *addr, int size, u32 val);
 
-u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg);
-void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val);
+u32 dw_pcie_readl_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg);
+void dw_pcie_writel_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
+			u32 val);
 int dw_pcie_link_up(struct dw_pcie *pci);
 int dw_pcie_wait_for_link(struct dw_pcie *pci);
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
diff --git a/drivers/pci/dwc/pcie-hisi.c b/drivers/pci/dwc/pcie-hisi.c
index fd66a31..409b54b 100644
--- a/drivers/pci/dwc/pcie-hisi.c
+++ b/drivers/pci/dwc/pcie-hisi.c
@@ -152,10 +152,11 @@ static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
 	u32 reg_val;
 	void *walker = &reg_val;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	void __iomem *base = pci->dbi_base;
 
 	walker += (where & 0x3);
 	reg = where & ~0x3;
-	reg_val = dw_pcie_readl_dbi(pci, reg);
+	reg_val = dw_pcie_readl_dbi(pci, base, reg);
 
 	if (size == 1)
 		*val = *(u8 __force *) walker;
@@ -177,19 +178,20 @@ static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int  size,
 	u32 reg;
 	void *walker = &reg_val;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	void __iomem *base = pci->dbi_base;
 
 	walker += (where & 0x3);
 	reg = where & ~0x3;
 	if (size == 4)
-		dw_pcie_writel_dbi(pci, reg, val);
+		dw_pcie_writel_dbi(pci, base, reg, val);
 	else if (size == 2) {
-		reg_val = dw_pcie_readl_dbi(pci, reg);
+		reg_val = dw_pcie_readl_dbi(pci, base, reg);
 		*(u16 __force *) walker = val;
-		dw_pcie_writel_dbi(pci, reg, reg_val);
+		dw_pcie_writel_dbi(pci, base, reg, reg_val);
 	} else if (size == 1) {
-		reg_val = dw_pcie_readl_dbi(pci, reg);
+		reg_val = dw_pcie_readl_dbi(pci, base, reg);
 		*(u8 __force *) walker = val;
-		dw_pcie_writel_dbi(pci, reg, reg_val);
+		dw_pcie_writel_dbi(pci, base, reg, reg_val);
 	} else
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
@@ -209,9 +211,10 @@ static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie)
 static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie)
 {
 	struct dw_pcie *pci = hisi_pcie->pci;
+	void __iomem *base = pci->dbi_base;
 	u32 val;
 
-	val = dw_pcie_readl_dbi(pci, PCIE_SYS_STATE4);
+	val = dw_pcie_readl_dbi(pci, base, PCIE_SYS_STATE4);
 
 	return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
 }
-- 
1.7.9.5

[PATCH v3 5/7] PCI: dwc: all: Modify dbi accessors to access data of 4/2/1 bytes

[Kishon Vijay Abraham I]

Previously dbi accessors can be used to access data of size 4
bytes. But there might be situations (like accessing
MSI_MESSAGE_CONTROL in order to set/get the number of required
MSI interrupts in EP mode) where dbi accessors must
be used to access data of size 2. This is in preparation for
adding endpoint mode support to designware driver.

Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Niklas Cassel <niklas.cassel@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Joao Pinto <Joao.Pinto@synopsys.com>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pci-dra7xx.c           |    8 ++--
 drivers/pci/dwc/pci-exynos.c           |   16 +++----
 drivers/pci/dwc/pci-imx6.c             |   54 +++++++++++-----------
 drivers/pci/dwc/pci-keystone-dw.c      |   13 +++---
 drivers/pci/dwc/pcie-armada8k.c        |   38 ++++++++--------
 drivers/pci/dwc/pcie-artpec6.c         |    6 +--
 drivers/pci/dwc/pcie-designware-host.c |   18 ++++----
 drivers/pci/dwc/pcie-designware.c      |   77 +++++++++++++++++++-------------
 drivers/pci/dwc/pcie-designware.h      |   14 +++---
 drivers/pci/dwc/pcie-hisi.c            |   14 +++---
 10 files changed, 138 insertions(+), 120 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 3708bd6..c6fef0a 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -499,9 +499,9 @@ static int dra7xx_pcie_suspend(struct device *dev)
 	u32 val;
 
 	/* clear MSE */
-	val = dw_pcie_readl_dbi(pci, base, PCI_COMMAND);
+	val = dw_pcie_read_dbi(pci, base, PCI_COMMAND, 0x4);
 	val &= ~PCI_COMMAND_MEMORY;
-	dw_pcie_writel_dbi(pci, base, PCI_COMMAND, val);
+	dw_pcie_write_dbi(pci, base, PCI_COMMAND, 0x4, val);
 
 	return 0;
 }
@@ -514,9 +514,9 @@ static int dra7xx_pcie_resume(struct device *dev)
 	u32 val;
 
 	/* set MSE */
-	val = dw_pcie_readl_dbi(pci, base, PCI_COMMAND);
+	val = dw_pcie_read_dbi(pci, base, PCI_COMMAND, 0x4);
 	val |= PCI_COMMAND_MEMORY;
-	dw_pcie_writel_dbi(pci, base, PCI_COMMAND, val);
+	dw_pcie_write_dbi(pci, base, PCI_COMMAND, 0x4, val);
 
 	return 0;
 }
diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
index a0d40f7..37d6d2b 100644
--- a/drivers/pci/dwc/pci-exynos.c
+++ b/drivers/pci/dwc/pci-exynos.c
@@ -521,25 +521,25 @@ static void exynos_pcie_enable_interrupts(struct exynos_pcie *ep)
 		exynos_pcie_msi_init(ep);
 }
 
-static u32 exynos_pcie_readl_dbi(struct dw_pcie *pci, void __iomem *base,
-				 u32 reg)
+static u32 exynos_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
+				u32 reg, size_t size)
 {
 	struct exynos_pcie *ep = to_exynos_pcie(pci);
 	u32 val;
 
 	exynos_pcie_sideband_dbi_r_mode(ep, true);
-	val = readl(base + reg);
+	dw_pcie_read(base + reg, size, &val);
 	exynos_pcie_sideband_dbi_r_mode(ep, false);
 	return val;
 }
 
-static void exynos_pcie_writel_dbi(struct dw_pcie *pci, void __iomem *base,
-				   u32 reg, u32 val)
+static void exynos_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
+				  u32 reg, size_t size, u32 val)
 {
 	struct exynos_pcie *ep = to_exynos_pcie(pci);
 
 	exynos_pcie_sideband_dbi_w_mode(ep, true);
-	writel(val, base + reg);
+	dw_pcie_write(base + reg, size, val);
 	exynos_pcie_sideband_dbi_w_mode(ep, false);
 }
 
@@ -646,8 +646,8 @@ static int __init exynos_add_pcie_port(struct exynos_pcie *ep,
 }
 
 static const struct dw_pcie_ops dw_pcie_ops = {
-	.readl_dbi = exynos_pcie_readl_dbi,
-	.writel_dbi = exynos_pcie_writel_dbi,
+	.read_dbi = exynos_pcie_read_dbi,
+	.write_dbi = exynos_pcie_write_dbi,
 	.link_up = exynos_pcie_link_up,
 };
 
diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c
index 85dd901..e58ca7a 100644
--- a/drivers/pci/dwc/pci-imx6.c
+++ b/drivers/pci/dwc/pci-imx6.c
@@ -104,7 +104,7 @@ static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, int exp_val)
 	u32 wait_counter = 0;
 
 	do {
-		val = dw_pcie_readl_dbi(pci, base, PCIE_PHY_STAT);
+		val = dw_pcie_read_dbi(pci, base, PCIE_PHY_STAT, 0x4);
 		val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
 		wait_counter++;
 
@@ -125,17 +125,17 @@ static int pcie_phy_wait_ack(struct imx6_pcie *imx6_pcie, int addr)
 	int ret;
 
 	val = addr << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, val);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, val);
 
 	val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, val);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, val);
 
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
 	if (ret)
 		return ret;
 
 	val = addr << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, val);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, val);
 
 	return pcie_phy_poll_ack(imx6_pcie, 0);
 }
@@ -154,17 +154,17 @@ static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, int *data)
 
 	/* assert Read signal */
 	phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, phy_ctl);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, phy_ctl);
 
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
 	if (ret)
 		return ret;
 
-	val = dw_pcie_readl_dbi(pci, base, PCIE_PHY_STAT);
+	val = dw_pcie_read_dbi(pci, base, PCIE_PHY_STAT, 0x4);
 	*data = val & 0xffff;
 
 	/* deassert Read signal */
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, 0x00);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, 0x00);
 
 	return pcie_phy_poll_ack(imx6_pcie, 0);
 }
@@ -183,11 +183,11 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 		return ret;
 
 	var = data << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, var);
 
 	/* capture data */
 	var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, var);
 
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
 	if (ret)
@@ -195,7 +195,7 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 
 	/* deassert cap data */
 	var = data << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, var);
 
 	/* wait for ack de-assertion */
 	ret = pcie_phy_poll_ack(imx6_pcie, 0);
@@ -204,7 +204,7 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 
 	/* assert wr signal */
 	var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, var);
 
 	/* wait for ack */
 	ret = pcie_phy_poll_ack(imx6_pcie, 1);
@@ -213,14 +213,14 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
 
 	/* deassert wr signal */
 	var = data << PCIE_PHY_CTRL_DATA_LOC;
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, var);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, var);
 
 	/* wait for ack de-assertion */
 	ret = pcie_phy_poll_ack(imx6_pcie, 0);
 	if (ret)
 		return ret;
 
-	dw_pcie_writel_dbi(pci, base, PCIE_PHY_CTRL, 0x0);
+	dw_pcie_write_dbi(pci, base, PCIE_PHY_CTRL, 0x4, 0x0);
 
 	return 0;
 }
@@ -423,8 +423,8 @@ static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie)
 		return 0;
 
 	dev_dbg(dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
-		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R0),
-		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1));
+		dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R0, 0x4),
+		dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R1, 0x4));
 	return -ETIMEDOUT;
 }
 
@@ -437,8 +437,8 @@ static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
 	unsigned int retries;
 
 	for (retries = 0; retries < 200; retries++) {
-		tmp = dw_pcie_readl_dbi(pci, base,
-					PCIE_LINK_WIDTH_SPEED_CONTROL);
+		tmp = dw_pcie_read_dbi(pci, base,
+				       PCIE_LINK_WIDTH_SPEED_CONTROL, 0x4);
 		/* Test if the speed change finished. */
 		if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
 			return 0;
@@ -471,10 +471,10 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 	 * started in Gen2 mode, there is a possibility the devices on the
 	 * bus will not be detected at all.  This happens with PCIe switches.
 	 */
-	tmp = dw_pcie_readl_dbi(pci, base, PCIE_RC_LCR);
+	tmp = dw_pcie_read_dbi(pci, base, PCIE_RC_LCR, 0x4);
 	tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
 	tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1;
-	dw_pcie_writel_dbi(pci, base, PCIE_RC_LCR, tmp);
+	dw_pcie_write_dbi(pci, base, PCIE_RC_LCR, 0x4, tmp);
 
 	/* Start LTSSM. */
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -486,10 +486,10 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 
 	if (imx6_pcie->link_gen == 2) {
 		/* Allow Gen2 mode after the link is up. */
-		tmp = dw_pcie_readl_dbi(pci, base, PCIE_RC_LCR);
+		tmp = dw_pcie_read_dbi(pci, base, PCIE_RC_LCR, 0x4);
 		tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
 		tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2;
-		dw_pcie_writel_dbi(pci, base, PCIE_RC_LCR, tmp);
+		dw_pcie_write_dbi(pci, base, PCIE_RC_LCR, 0x4, tmp);
 	} else {
 		dev_info(dev, "Link: Gen2 disabled\n");
 	}
@@ -498,9 +498,9 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 	 * Start Directed Speed Change so the best possible speed both link
 	 * partners support can be negotiated.
 	 */
-	tmp = dw_pcie_readl_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL);
+	tmp = dw_pcie_read_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, 0x4);
 	tmp |= PORT_LOGIC_SPEED_CHANGE;
-	dw_pcie_writel_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
+	dw_pcie_write_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, 0x4, tmp);
 
 	ret = imx6_pcie_wait_for_speed_change(imx6_pcie);
 	if (ret) {
@@ -515,14 +515,14 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
 		goto err_reset_phy;
 	}
 
-	tmp = dw_pcie_readl_dbi(pci, base, PCIE_RC_LCSR);
+	tmp = dw_pcie_read_dbi(pci, base, PCIE_RC_LCSR, 0x4);
 	dev_info(dev, "Link up, Gen%i\n", (tmp >> 16) & 0xf);
 	return 0;
 
 err_reset_phy:
 	dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
-		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R0),
-		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1));
+		dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R0, 0x4),
+		dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R1, 0x4));
 	imx6_pcie_reset_phy(imx6_pcie);
 	return ret;
 }
@@ -546,7 +546,7 @@ static int imx6_pcie_link_up(struct dw_pcie *pci)
 {
 	void __iomem *base = pci->dbi_base;
 
-	return dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1) &
+	return dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R1, 0x4) &
 			PCIE_PHY_DEBUG_R1_XMLH_LINK_UP;
 }
 
diff --git a/drivers/pci/dwc/pci-keystone-dw.c b/drivers/pci/dwc/pci-keystone-dw.c
index 7220c04..8318efe 100644
--- a/drivers/pci/dwc/pci-keystone-dw.c
+++ b/drivers/pci/dwc/pci-keystone-dw.c
@@ -386,8 +386,8 @@ void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
 
 	/* Disable BARs for inbound access */
 	ks_dw_pcie_set_dbi_mode(ks_pcie);
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, 0);
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_1, 0);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x4, 0);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_1, 0x4, 0);
 	ks_dw_pcie_clear_dbi_mode(ks_pcie);
 
 	/* Set outbound translation size per window division */
@@ -490,8 +490,8 @@ void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
 	ks_dw_pcie_set_dbi_mode(ks_pcie);
 
 	/* Enable BAR0 */
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, 1);
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, SZ_4K - 1);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x4, 1);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x4, SZ_4K - 1);
 
 	ks_dw_pcie_clear_dbi_mode(ks_pcie);
 
@@ -499,7 +499,8 @@ void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
 	  * For BAR0, just setting bus address for inbound writes (MSI) should
 	  * be sufficient.  Use physical address to avoid any conflicts.
 	  */
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x4,
+			  ks_pcie->app.start);
 }
 
 /**
@@ -510,7 +511,7 @@ int ks_dw_pcie_link_up(struct dw_pcie *pci)
 	u32 val;
 	void __iomem *base = pci->dbi_base;
 
-	val = dw_pcie_readl_dbi(pci, base, DEBUG0);
+	val = dw_pcie_read_dbi(pci, base, DEBUG0, 0x4);
 	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
 }
 
diff --git a/drivers/pci/dwc/pcie-armada8k.c b/drivers/pci/dwc/pcie-armada8k.c
index b2328df..447d178 100644
--- a/drivers/pci/dwc/pcie-armada8k.c
+++ b/drivers/pci/dwc/pcie-armada8k.c
@@ -75,7 +75,7 @@ static int armada8k_pcie_link_up(struct dw_pcie *pci)
 	u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
 	void __iomem *base = pci->dbi_base;
 
-	reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_STATUS_REG);
+	reg = dw_pcie_read_dbi(pci, base, PCIE_GLOBAL_STATUS_REG, 0x4);
 
 	if ((reg & mask) == mask)
 		return 1;
@@ -92,45 +92,45 @@ static void armada8k_pcie_establish_link(struct armada8k_pcie *pcie)
 
 	if (!dw_pcie_link_up(pci)) {
 		/* Disable LTSSM state machine to enable configuration */
-		reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG);
+		reg = dw_pcie_read_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, 0x4);
 		reg &= ~(PCIE_APP_LTSSM_EN);
-		dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, reg);
+		dw_pcie_write_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, 0x4, reg);
 	}
 
 	/* Set the device to root complex mode */
-	reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG);
+	reg = dw_pcie_read_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, 0x4);
 	reg &= ~(PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_SHIFT);
 	reg |= PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_SHIFT;
-	dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, reg);
+	dw_pcie_write_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, 0x4, reg);
 
 	/* Set the PCIe master AxCache attributes */
-	dw_pcie_writel_dbi(pci, base, PCIE_ARCACHE_TRC_REG,
-			   ARCACHE_DEFAULT_VALUE);
-	dw_pcie_writel_dbi(pci, base, PCIE_AWCACHE_TRC_REG,
-			   AWCACHE_DEFAULT_VALUE);
+	dw_pcie_write_dbi(pci, base, PCIE_ARCACHE_TRC_REG, 0x4,
+			  ARCACHE_DEFAULT_VALUE);
+	dw_pcie_write_dbi(pci, base, PCIE_AWCACHE_TRC_REG, 0x4,
+			  AWCACHE_DEFAULT_VALUE);
 
 	/* Set the PCIe master AxDomain attributes */
-	reg = dw_pcie_readl_dbi(pci, base, PCIE_ARUSER_REG);
+	reg = dw_pcie_read_dbi(pci, base, PCIE_ARUSER_REG, 0x4);
 	reg &= ~(AX_USER_DOMAIN_MASK << AX_USER_DOMAIN_SHIFT);
 	reg |= DOMAIN_OUTER_SHAREABLE << AX_USER_DOMAIN_SHIFT;
-	dw_pcie_writel_dbi(pci, base, PCIE_ARUSER_REG, reg);
+	dw_pcie_write_dbi(pci, base, PCIE_ARUSER_REG, 0x4, reg);
 
-	reg = dw_pcie_readl_dbi(pci, base, PCIE_AWUSER_REG);
+	reg = dw_pcie_read_dbi(pci, base, PCIE_AWUSER_REG, 0x4);
 	reg &= ~(AX_USER_DOMAIN_MASK << AX_USER_DOMAIN_SHIFT);
 	reg |= DOMAIN_OUTER_SHAREABLE << AX_USER_DOMAIN_SHIFT;
-	dw_pcie_writel_dbi(pci, base, PCIE_AWUSER_REG, reg);
+	dw_pcie_write_dbi(pci, base, PCIE_AWUSER_REG, 0x4, reg);
 
 	/* Enable INT A-D interrupts */
-	reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_INT_MASK1_REG);
+	reg = dw_pcie_read_dbi(pci, base, PCIE_GLOBAL_INT_MASK1_REG, 0x4);
 	reg |= PCIE_INT_A_ASSERT_MASK | PCIE_INT_B_ASSERT_MASK |
 	       PCIE_INT_C_ASSERT_MASK | PCIE_INT_D_ASSERT_MASK;
-	dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_INT_MASK1_REG, reg);
+	dw_pcie_write_dbi(pci, base, PCIE_GLOBAL_INT_MASK1_REG, 0x4, reg);
 
 	if (!dw_pcie_link_up(pci)) {
 		/* Configuration done. Start LTSSM */
-		reg = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG);
+		reg = dw_pcie_read_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, 0x4);
 		reg |= PCIE_APP_LTSSM_EN;
-		dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, reg);
+		dw_pcie_write_dbi(pci, base, PCIE_GLOBAL_CONTROL_REG, 0x4, reg);
 	}
 
 	/* Wait until the link becomes active again */
@@ -159,8 +159,8 @@ static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
 	 * PCI device. However, they are also latched into the PCIe
 	 * controller, so we simply discard them.
 	 */
-	val = dw_pcie_readl_dbi(pci, base, PCIE_GLOBAL_INT_CAUSE1_REG);
-	dw_pcie_writel_dbi(pci, base, PCIE_GLOBAL_INT_CAUSE1_REG, val);
+	val = dw_pcie_read_dbi(pci, base, PCIE_GLOBAL_INT_CAUSE1_REG, 0x4);
+	dw_pcie_write_dbi(pci, base, PCIE_GLOBAL_INT_CAUSE1_REG, 0x4, val);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index e3ba11c..0829de4 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -146,7 +146,7 @@ static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 	 * Enable writing to config regs. This is required as the Synopsys
 	 * driver changes the class code. That register needs DBI write enable.
 	 */
-	dw_pcie_writel_dbi(pci, base, MISC_CONTROL_1_OFF, DBI_RO_WR_EN);
+	dw_pcie_write_dbi(pci, base, MISC_CONTROL_1_OFF, 0x4, DBI_RO_WR_EN);
 
 	/* setup root complex */
 	dw_pcie_setup_rc(pp);
@@ -161,8 +161,8 @@ static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
 		return 0;
 
 	dev_dbg(pci->dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
-		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R0),
-		dw_pcie_readl_dbi(pci, base, PCIE_PHY_DEBUG_R1));
+		dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R0, 0x4),
+		dw_pcie_read_dbi(pci, base, PCIE_PHY_DEBUG_R1, 0x4));
 
 	return -ETIMEDOUT;
 }
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 9df620d..3150d33 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -568,7 +568,7 @@ static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
 	u32 val;
 	void __iomem *base = pci->dbi_base;
 
-	val = dw_pcie_readl_dbi(pci, base, PCIE_ATU_VIEWPORT);
+	val = dw_pcie_read_dbi(pci, base, PCIE_ATU_VIEWPORT, 0x4);
 	if (val == 0xffffffff)
 		return 1;
 
@@ -584,27 +584,27 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	dw_pcie_setup(pci);
 
 	/* setup RC BARs */
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x00000004);
-	dw_pcie_writel_dbi(pci, base, PCI_BASE_ADDRESS_1, 0x00000000);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_0, 0x4, 0x00000004);
+	dw_pcie_write_dbi(pci, base, PCI_BASE_ADDRESS_1, 0x4, 0x00000000);
 
 	/* setup interrupt pins */
-	val = dw_pcie_readl_dbi(pci, base, PCI_INTERRUPT_LINE);
+	val = dw_pcie_read_dbi(pci, base, PCI_INTERRUPT_LINE, 0x4);
 	val &= 0xffff00ff;
 	val |= 0x00000100;
-	dw_pcie_writel_dbi(pci, base, PCI_INTERRUPT_LINE, val);
+	dw_pcie_write_dbi(pci, base, PCI_INTERRUPT_LINE, 0x4, val);
 
 	/* setup bus numbers */
-	val = dw_pcie_readl_dbi(pci, base, PCI_PRIMARY_BUS);
+	val = dw_pcie_read_dbi(pci, base, PCI_PRIMARY_BUS, 0x4);
 	val &= 0xff000000;
 	val |= 0x00010100;
-	dw_pcie_writel_dbi(pci, base, PCI_PRIMARY_BUS, val);
+	dw_pcie_write_dbi(pci, base, PCI_PRIMARY_BUS, 0x4, val);
 
 	/* setup command register */
-	val = dw_pcie_readl_dbi(pci, base, PCI_COMMAND);
+	val = dw_pcie_read_dbi(pci, base, PCI_COMMAND, 0x4);
 	val &= 0xffff0000;
 	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
 		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
-	dw_pcie_writel_dbi(pci, base, PCI_COMMAND, val);
+	dw_pcie_write_dbi(pci, base, PCI_COMMAND, 0x4, val);
 
 	/*
 	 * If the platform provides ->rd_other_conf, it means the platform
diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index f8eaeea..557ee53 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -61,21 +61,35 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val)
 	return PCIBIOS_SUCCESSFUL;
 }
 
-u32 dw_pcie_readl_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg)
+u32 dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
+		     size_t size)
 {
-	if (pci->ops->readl_dbi)
-		return pci->ops->readl_dbi(pci, base, reg);
+	int ret;
+	u32 val;
+
+	if (pci->ops->read_dbi)
+		return pci->ops->read_dbi(pci, base,  reg, size);
 
-	return readl(base + reg);
+	ret = dw_pcie_read(base + reg, size, &val);
+	if (ret)
+		dev_err(pci->dev, "read DBI address failed\n");
+
+	return val;
 }
 
-void dw_pcie_writel_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			u32 val)
+void dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
+		       size_t size, u32 val)
 {
-	if (pci->ops->writel_dbi)
-		pci->ops->writel_dbi(pci, base, reg, val);
-	else
-		writel(val, base + reg);
+	int ret;
+
+	if (pci->ops->write_dbi) {
+		pci->ops->write_dbi(pci, base, reg, size, val);
+		return;
+	}
+
+	ret = dw_pcie_write(base + reg, size, val);
+	if (ret)
+		dev_err(pci->dev, "write DBI address failed\n");
 }
 
 static u32 dw_pcie_readl_unroll(struct dw_pcie *pci, void __iomem *base,
@@ -83,7 +97,7 @@ static u32 dw_pcie_readl_unroll(struct dw_pcie *pci, void __iomem *base,
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
 
-	return dw_pcie_readl_dbi(pci, base, offset + reg);
+	return dw_pcie_read_dbi(pci, base, offset + reg, 0x4);
 }
 
 static void dw_pcie_writel_unroll(struct dw_pcie *pci, void __iomem *base,
@@ -91,7 +105,7 @@ static void dw_pcie_writel_unroll(struct dw_pcie *pci, void __iomem *base,
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
 
-	dw_pcie_writel_dbi(pci, base, offset + reg, val);
+	dw_pcie_write_dbi(pci, base, offset + reg, 0x4, val);
 }
 
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
@@ -123,20 +137,21 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 				      PCIE_ATU_UNR_REGION_CTRL2,
 				      PCIE_ATU_ENABLE);
 	} else {
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_VIEWPORT,
-				   PCIE_ATU_REGION_OUTBOUND | index);
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_LOWER_BASE,
-				   lower_32_bits(cpu_addr));
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_UPPER_BASE,
-				   upper_32_bits(cpu_addr));
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_LIMIT,
-				   lower_32_bits(cpu_addr + size - 1));
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_LOWER_TARGET,
-				   lower_32_bits(pci_addr));
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_UPPER_TARGET,
-				   upper_32_bits(pci_addr));
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_CR1, type);
-		dw_pcie_writel_dbi(pci, base, PCIE_ATU_CR2, PCIE_ATU_ENABLE);
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_VIEWPORT, 0x4,
+				  PCIE_ATU_REGION_OUTBOUND | index);
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_BASE, 0x4,
+				  lower_32_bits(cpu_addr));
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_BASE, 0x4,
+				  upper_32_bits(cpu_addr));
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_LIMIT, 0x4,
+				  lower_32_bits(cpu_addr + size - 1));
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_TARGET, 0x4,
+				  lower_32_bits(pci_addr));
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_TARGET, 0x4,
+				  upper_32_bits(pci_addr));
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_CR1, 0x4, type);
+		dw_pcie_write_dbi(pci, base, PCIE_ATU_CR2, 0x4,
+				  PCIE_ATU_ENABLE);
 	}
 
 	/*
@@ -148,7 +163,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 			val = dw_pcie_readl_unroll(pci, base, index,
 						   PCIE_ATU_UNR_REGION_CTRL2);
 		else
-			val = dw_pcie_readl_dbi(pci, base, PCIE_ATU_CR2);
+			val = dw_pcie_read_dbi(pci, base, PCIE_ATU_CR2, 0x4);
 
 		if (val == PCIE_ATU_ENABLE)
 			return;
@@ -202,7 +217,7 @@ void dw_pcie_setup(struct dw_pcie *pci)
 		lanes = 0;
 
 	/* set the number of lanes */
-	val = dw_pcie_readl_dbi(pci, base, PCIE_PORT_LINK_CONTROL);
+	val = dw_pcie_read_dbi(pci, base, PCIE_PORT_LINK_CONTROL, 0x4);
 	val &= ~PORT_LINK_MODE_MASK;
 	switch (lanes) {
 	case 1:
@@ -221,10 +236,10 @@ void dw_pcie_setup(struct dw_pcie *pci)
 		dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes);
 		return;
 	}
-	dw_pcie_writel_dbi(pci, base, PCIE_PORT_LINK_CONTROL, val);
+	dw_pcie_write_dbi(pci, base, PCIE_PORT_LINK_CONTROL, 0x4, val);
 
 	/* set link width speed control register */
-	val = dw_pcie_readl_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL);
+	val = dw_pcie_read_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, 0x4);
 	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
 	switch (lanes) {
 	case 1:
@@ -240,5 +255,5 @@ void dw_pcie_setup(struct dw_pcie *pci)
 		val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
 		break;
 	}
-	dw_pcie_writel_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
+	dw_pcie_write_dbi(pci, base, PCIE_LINK_WIDTH_SPEED_CONTROL, 0x4, val);
 }
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index fe93f7f..74df063 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -144,9 +144,10 @@ struct pcie_port {
 
 struct dw_pcie_ops {
 	u64	(*cpu_addr_fixup)(u64 cpu_addr);
-	u32	(*readl_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg);
-	void	(*writel_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
-			      u32 val);
+	u32	(*read_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
+			    size_t size);
+	void	(*write_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
+			     size_t size, u32 val);
 	int	(*link_up)(struct dw_pcie *pcie);
 };
 
@@ -164,9 +165,10 @@ struct dw_pcie {
 int dw_pcie_read(void __iomem *addr, int size, u32 *val);
 int dw_pcie_write(void __iomem *addr, int size, u32 val);
 
-u32 dw_pcie_readl_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg);
-void dw_pcie_writel_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			u32 val);
+u32 dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
+		     size_t size);
+void dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
+		       size_t size, u32 val);
 int dw_pcie_link_up(struct dw_pcie *pci);
 int dw_pcie_wait_for_link(struct dw_pcie *pci);
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
diff --git a/drivers/pci/dwc/pcie-hisi.c b/drivers/pci/dwc/pcie-hisi.c
index 409b54b..cc04381 100644
--- a/drivers/pci/dwc/pcie-hisi.c
+++ b/drivers/pci/dwc/pcie-hisi.c
@@ -156,7 +156,7 @@ static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
 
 	walker += (where & 0x3);
 	reg = where & ~0x3;
-	reg_val = dw_pcie_readl_dbi(pci, base, reg);
+	reg_val = dw_pcie_read_dbi(pci, base, reg, 0x4);
 
 	if (size == 1)
 		*val = *(u8 __force *) walker;
@@ -183,15 +183,15 @@ static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int  size,
 	walker += (where & 0x3);
 	reg = where & ~0x3;
 	if (size == 4)
-		dw_pcie_writel_dbi(pci, base, reg, val);
+		dw_pcie_write_dbi(pci, base, reg, 0x4, val);
 	else if (size == 2) {
-		reg_val = dw_pcie_readl_dbi(pci, base, reg);
+		reg_val = dw_pcie_read_dbi(pci, base, reg, 0x4);
 		*(u16 __force *) walker = val;
-		dw_pcie_writel_dbi(pci, base, reg, reg_val);
+		dw_pcie_write_dbi(pci, base, reg, 0x4, reg_val);
 	} else if (size == 1) {
-		reg_val = dw_pcie_readl_dbi(pci, base, reg);
+		reg_val = dw_pcie_read_dbi(pci, base, reg, 0x4);
 		*(u8 __force *) walker = val;
-		dw_pcie_writel_dbi(pci, base, reg, reg_val);
+		dw_pcie_write_dbi(pci, base, reg, 0x4, reg_val);
 	} else
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
@@ -214,7 +214,7 @@ static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie)
 	void __iomem *base = pci->dbi_base;
 	u32 val;
 
-	val = dw_pcie_readl_dbi(pci, base, PCIE_SYS_STATE4);
+	val = dw_pcie_read_dbi(pci, base, PCIE_SYS_STATE4, 0x4);
 
 	return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
 }
-- 
1.7.9.5

[PATCH v3 6/7] PCI: dwc: designware: Move _unroll configurations to a separate function

[Kishon Vijay Abraham I]

No functional change. Rename dw_pcie_writel_unroll/dw_pcie_readl_unroll
to dw_pcie_writel_ob_unroll/dw_pcie_readl_ob_unroll respectively as these
functions are used to perform only outbound configurations. Also move
these _unroll configurations to a separate function.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pcie-designware.c |  112 ++++++++++++++++++++++---------------
 1 file changed, 67 insertions(+), 45 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index 557ee53..6657a84 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -92,22 +92,64 @@ void dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
 		dev_err(pci->dev, "write DBI address failed\n");
 }
 
-static u32 dw_pcie_readl_unroll(struct dw_pcie *pci, void __iomem *base,
-				u32 index, u32 reg)
+static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, void __iomem *base,
+				   u32 index, u32 reg)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
 
 	return dw_pcie_read_dbi(pci, base, offset + reg, 0x4);
 }
 
-static void dw_pcie_writel_unroll(struct dw_pcie *pci, void __iomem *base,
-				  u32 index, u32 reg, u32 val)
+static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, void __iomem *base,
+				     u32 index, u32 reg, u32 val)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
 
 	dw_pcie_write_dbi(pci, base, offset + reg, 0x4, val);
 }
 
+void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index, int type,
+				      u64 cpu_addr, u64 pci_addr, u32 size)
+{
+	u32 retries, val;
+	void __iomem *base = pci->dbi_base;
+
+	dw_pcie_writel_ob_unroll(pci, base, index,
+				 PCIE_ATU_UNR_LOWER_BASE,
+				 lower_32_bits(cpu_addr));
+	dw_pcie_writel_ob_unroll(pci, base, index,
+				 PCIE_ATU_UNR_UPPER_BASE,
+				 upper_32_bits(cpu_addr));
+	dw_pcie_writel_ob_unroll(pci, base, index, PCIE_ATU_UNR_LIMIT,
+				 lower_32_bits(cpu_addr + size - 1));
+	dw_pcie_writel_ob_unroll(pci, base, index,
+				 PCIE_ATU_UNR_LOWER_TARGET,
+				 lower_32_bits(pci_addr));
+	dw_pcie_writel_ob_unroll(pci, base, index,
+				 PCIE_ATU_UNR_UPPER_TARGET,
+				 upper_32_bits(pci_addr));
+	dw_pcie_writel_ob_unroll(pci, base, index,
+				 PCIE_ATU_UNR_REGION_CTRL1,
+				 type);
+	dw_pcie_writel_ob_unroll(pci, base, index,
+				 PCIE_ATU_UNR_REGION_CTRL2,
+				 PCIE_ATU_ENABLE);
+
+	/*
+	 * Make sure ATU enable takes effect before any subsequent config
+	 * and I/O accesses.
+	 */
+	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
+		val = dw_pcie_readl_ob_unroll(pci, base, index,
+					      PCIE_ATU_UNR_REGION_CTRL2);
+		if (val & PCIE_ATU_ENABLE)
+			return;
+
+		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
+	}
+	dev_err(pci->dev, "outbound iATU is not being enabled\n");
+}
+
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 			       u64 cpu_addr, u64 pci_addr, u32 size)
 {
@@ -118,59 +160,39 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 		cpu_addr = pci->ops->cpu_addr_fixup(cpu_addr);
 
 	if (pci->iatu_unroll_enabled) {
-		dw_pcie_writel_unroll(pci, base, index, PCIE_ATU_UNR_LOWER_BASE,
-				      lower_32_bits(cpu_addr));
-		dw_pcie_writel_unroll(pci, base, index, PCIE_ATU_UNR_UPPER_BASE,
-				      upper_32_bits(cpu_addr));
-		dw_pcie_writel_unroll(pci, base, index, PCIE_ATU_UNR_LIMIT,
-				      lower_32_bits(cpu_addr + size - 1));
-		dw_pcie_writel_unroll(pci, base, index,
-				      PCIE_ATU_UNR_LOWER_TARGET,
-				      lower_32_bits(pci_addr));
-		dw_pcie_writel_unroll(pci, base, index,
-				      PCIE_ATU_UNR_UPPER_TARGET,
-				      upper_32_bits(pci_addr));
-		dw_pcie_writel_unroll(pci, base, index,
-				      PCIE_ATU_UNR_REGION_CTRL1,
-				      type);
-		dw_pcie_writel_unroll(pci, base, index,
-				      PCIE_ATU_UNR_REGION_CTRL2,
-				      PCIE_ATU_ENABLE);
-	} else {
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_VIEWPORT, 0x4,
-				  PCIE_ATU_REGION_OUTBOUND | index);
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_BASE, 0x4,
-				  lower_32_bits(cpu_addr));
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_BASE, 0x4,
-				  upper_32_bits(cpu_addr));
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_LIMIT, 0x4,
-				  lower_32_bits(cpu_addr + size - 1));
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_TARGET, 0x4,
-				  lower_32_bits(pci_addr));
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_TARGET, 0x4,
-				  upper_32_bits(pci_addr));
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_CR1, 0x4, type);
-		dw_pcie_write_dbi(pci, base, PCIE_ATU_CR2, 0x4,
-				  PCIE_ATU_ENABLE);
+		dw_pcie_prog_outbound_atu_unroll(pci, index, type, cpu_addr,
+						 pci_addr, size);
+		return;
 	}
 
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_VIEWPORT, 0x4,
+			  PCIE_ATU_REGION_OUTBOUND | index);
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_BASE, 0x4,
+			  lower_32_bits(cpu_addr));
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_BASE, 0x4,
+			  upper_32_bits(cpu_addr));
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_LIMIT, 0x4,
+			  lower_32_bits(cpu_addr + size - 1));
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_TARGET, 0x4,
+			  lower_32_bits(pci_addr));
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_TARGET, 0x4,
+			  upper_32_bits(pci_addr));
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_CR1, 0x4, type);
+	dw_pcie_write_dbi(pci, base, PCIE_ATU_CR2, 0x4,
+			  PCIE_ATU_ENABLE);
+
 	/*
 	 * Make sure ATU enable takes effect before any subsequent config
 	 * and I/O accesses.
 	 */
 	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
-		if (pci->iatu_unroll_enabled)
-			val = dw_pcie_readl_unroll(pci, base, index,
-						   PCIE_ATU_UNR_REGION_CTRL2);
-		else
-			val = dw_pcie_read_dbi(pci, base, PCIE_ATU_CR2, 0x4);
-
+		val = dw_pcie_read_dbi(pci, base, PCIE_ATU_CR2, 0x4);
 		if (val == PCIE_ATU_ENABLE)
 			return;
 
 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
-	dev_err(pci->dev, "iATU is not being enabled\n");
+	dev_err(pci->dev, "outbound iATU is not being enabled\n");
 }
 
 int dw_pcie_wait_for_link(struct dw_pcie *pci)
-- 
1.7.9.5

[PATCH v3 7/7] PCI: dwc: dra7xx: Push request_irq call to the bottom of probe

[Kishon Vijay Abraham I]

From: Keerthy <j-keerthy@ti.com>

Currently devm_request_irq is being called before base, pci fields
of dra7xx_pcie structure are populated. It is called even before
pm_runtime_enable and pm_runtime_get_sync are called. This will
lead to exceptions if in case an interrupt is triggered before
the all of the above are done. Hence push the devm_request_irq
call to the end of the probe.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/dwc/pci-dra7xx.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index c6fef0a..8c53233 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -410,13 +410,6 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
-			       IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
-	if (ret) {
-		dev_err(dev, "failed to request irq\n");
-		return ret;
-	}
-
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
 	base = devm_ioremap_nocache(dev, res->start, resource_size(res));
 	if (!base)
@@ -478,6 +471,13 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err_gpio;
 
+	ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
+			       IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
+	if (ret) {
+		dev_err(dev, "failed to request irq\n");
+		goto err_gpio;
+	}
+
 	return 0;
 
 err_gpio:
-- 
1.7.9.5