RE: [PATCHv2 16/25] PCI: mobiveil: refactor Mobiveil PCIe Host Bridge IP driver

["M.h. Lian" <minghuan.lian@nxp.com>]

reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>

> -----Original Message-----
> From: Z.q. Hou
> Sent: Tuesday, November 20, 2018 5:27 PM
> To: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org;
> bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com;
> l.subrahmanya@mobiveil.co.in; shawnguo@kernel.org; Leo Li
> <leoyang.li@nxp.com>; lorenzo.pieralisi@arm.com;
> catalin.marinas@arm.com; will.deacon@arm.com
> Cc: Mingkai Hu <mingkai.hu@nxp.com>; M.h. Lian
> <minghuan.lian@nxp.com>; Xiaowei Bao <xiaowei.bao@nxp.com>; Z.q. Hou
> <zhiqiang.hou@nxp.com>
> Subject: [PATCHv2 16/25] PCI: mobiveil: refactor Mobiveil PCIe Host Bridge IP
> driver
> 
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> 
> As the Mobiveil PCIe controller support RC&EP DAUL mode, and to make
> platforms which integrated the Mobiveil PCIe IP more easy to add their
> drivers, this patch moved the Mobiveil driver to a new directory
> 'drivers/pci/controller/mobiveil' and refactored it according to the
> abstraction of RC&EP (EP driver will be added later).
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> ---
> V2:
>  - Move interrupts enabling to interrupt init function and revert to
>    just enable INTX and MSI.
> 
>  MAINTAINERS                                   |   2 +-
>  drivers/pci/controller/Kconfig                |  11 +-
>  drivers/pci/controller/Makefile               |   2 +-
>  drivers/pci/controller/mobiveil/Kconfig       |  24 +
>  drivers/pci/controller/mobiveil/Makefile      |   4 +
>  .../pcie-mobiveil-host.c}                     | 528 +++---------------
>  .../controller/mobiveil/pcie-mobiveil-plat.c  |  54 ++
>  .../pci/controller/mobiveil/pcie-mobiveil.c   | 228 ++++++++
>  .../pci/controller/mobiveil/pcie-mobiveil.h   | 187 +++++++
>  9 files changed, 587 insertions(+), 453 deletions(-)  create mode 100644
> drivers/pci/controller/mobiveil/Kconfig
>  create mode 100644 drivers/pci/controller/mobiveil/Makefile
>  rename drivers/pci/controller/{pcie-mobiveil.c => mobiveil/pcie-mobiveil-
> host.c} (55%)  create mode 100644 drivers/pci/controller/mobiveil/pcie-
> mobiveil-plat.c
>  create mode 100644 drivers/pci/controller/mobiveil/pcie-mobiveil.c
>  create mode 100644 drivers/pci/controller/mobiveil/pcie-mobiveil.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2d916afea75d..084d225583e0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11447,7 +11447,7 @@ M:	Subrahmanya Lingappa
> <l.subrahmanya@mobiveil.co.in>
>  L:	linux-pci@vger.kernel.org
>  S:	Supported
>  F:	Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
> -F:	drivers/pci/controller/pcie-mobiveil.c
> +F:	drivers/pci/controller/mobiveil/pcie-mobiveil*
> 
>  PCI DRIVER FOR MVEBU (Marvell Armada 370 and Armada XP SOC support)
>  M:	Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> index 6671946dbf66..0e981ed00a75 100644
> --- a/drivers/pci/controller/Kconfig
> +++ b/drivers/pci/controller/Kconfig
> @@ -241,16 +241,6 @@ config PCIE_MEDIATEK
>  	  Say Y here if you want to enable PCIe controller support on
>  	  MediaTek SoCs.
> 
> -config PCIE_MOBIVEIL
> -	bool "Mobiveil AXI PCIe controller"
> -	depends on ARCH_ZYNQMP || COMPILE_TEST
> -	depends on OF
> -	depends on PCI_MSI_IRQ_DOMAIN
> -	help
> -	  Say Y here if you want to enable support for the Mobiveil AXI PCIe
> -	  Soft IP. It has up to 8 outbound and inbound windows
> -	  for address translation and it is a PCIe Gen4 IP.
> -
>  config PCIE_TANGO_SMP8759
>  	bool "Tango SMP8759 PCIe controller (DANGEROUS)"
>  	depends on ARCH_TANGO && PCI_MSI && OF @@ -281,4 +271,5
> @@ config VMD
>  	  module will be called vmd.
> 
>  source "drivers/pci/controller/dwc/Kconfig"
> +source "drivers/pci/controller/mobiveil/Kconfig"
>  endmenu
> diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
> index d56a507495c5..b79a615041a0 100644
> --- a/drivers/pci/controller/Makefile
> +++ b/drivers/pci/controller/Makefile
> @@ -26,11 +26,11 @@ obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o
>  obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o
>  obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
>  obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
> -obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o
>  obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
>  obj-$(CONFIG_VMD) += vmd.o
>  # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
>  obj-y				+= dwc/
> +obj-y				+= mobiveil/
> 
> 
>  # The following drivers are for devices that use the generic ACPI diff --git
> a/drivers/pci/controller/mobiveil/Kconfig
> b/drivers/pci/controller/mobiveil/Kconfig
> new file mode 100644
> index 000000000000..64343c07bfed
> --- /dev/null
> +++ b/drivers/pci/controller/mobiveil/Kconfig
> @@ -0,0 +1,24 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +menu "Mobiveil PCIe Core Support"
> +	depends on PCI
> +
> +config PCIE_MOBIVEIL
> +	bool
> +
> +config PCIE_MOBIVEIL_HOST
> +        bool
> +	depends on PCI_MSI_IRQ_DOMAIN
> +        select PCIE_MOBIVEIL
> +
> +config PCIE_MOBIVEIL_PLAT
> +	bool "Mobiveil AXI PCIe controller"
> +	depends on ARCH_ZYNQMP || COMPILE_TEST
> +	depends on OF
> +	select PCIE_MOBIVEIL_HOST
> +	help
> +	  Say Y here if you want to enable support for the Mobiveil AXI PCIe
> +	  Soft IP. It has up to 8 outbound and inbound windows
> +	  for address translation and it is a PCIe Gen4 IP.
> +
> +endmenu
> diff --git a/drivers/pci/controller/mobiveil/Makefile
> b/drivers/pci/controller/mobiveil/Makefile
> new file mode 100644
> index 000000000000..9fb6d1c6504d
> --- /dev/null
> +++ b/drivers/pci/controller/mobiveil/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o
> +obj-$(CONFIG_PCIE_MOBIVEIL_HOST) += pcie-mobiveil-host.o
> +obj-$(CONFIG_PCIE_MOBIVEIL_PLAT) += pcie-mobiveil-plat.o
> diff --git a/drivers/pci/controller/pcie-mobiveil.c
> b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> similarity index 55%
> rename from drivers/pci/controller/pcie-mobiveil.c
> rename to drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index 9210165fe8c0..dc5324d94466 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -4,9 +4,9 @@
>   *
>   * Copyright (c) 2018 Mobiveil Inc.
>   * Author: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
> + * Refactor: Zhiqiang Hou <Zhiqiang.Hou@nxp.com>
>   */
> 
> -#include <linux/delay.h>
>  #include <linux/init.h>
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
> @@ -23,275 +23,21 @@
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
> 
> -#include "../pci.h"
> -
> -/* register offsets and bit positions */
> -
> -/*
> - * translation tables are grouped into windows, each window registers are
> - * grouped into blocks of 4 or 16 registers each
> - */
> -#define PAB_REG_BLOCK_SIZE		16
> -#define PAB_EXT_REG_BLOCK_SIZE		4
> -
> -#define PAB_REG_ADDR(offset, win)	\
> -	(offset + (win * PAB_REG_BLOCK_SIZE))
> -#define PAB_EXT_REG_ADDR(offset, win)	\
> -	(offset + (win * PAB_EXT_REG_BLOCK_SIZE))
> -
> -#define LTSSM_STATUS			0x0404
> -#define  LTSSM_STATUS_L0_MASK		0x3f
> -#define  LTSSM_STATUS_L0		0x2d
> -
> -#define PAB_CTRL			0x0808
> -#define  AMBA_PIO_ENABLE_SHIFT		0
> -#define  PEX_PIO_ENABLE_SHIFT		1
> -#define  PAGE_SEL_SHIFT			13
> -#define  PAGE_SEL_MASK			0x3f
> -#define  PAGE_LO_MASK			0x3ff
> -#define  PAGE_SEL_OFFSET_SHIFT		10
> -
> -#define PAB_AXI_PIO_CTRL		0x0840
> -#define  APIO_EN_MASK			0xf
> -
> -#define PAB_PEX_PIO_CTRL		0x08c0
> -#define  PIO_ENABLE_SHIFT		0
> -
> -#define PAB_INTP_AMBA_MISC_ENB		0x0b0c
> -#define PAB_INTP_AMBA_MISC_STAT		0x0b1c
> -#define  PAB_INTP_INTX_MASK		0x01e0
> -#define  PAB_INTP_MSI_MASK		0x8
> -
> -#define PAB_AXI_AMAP_CTRL(win)		PAB_REG_ADDR(0x0ba0, win)
> -#define  WIN_ENABLE_SHIFT		0
> -#define  WIN_TYPE_SHIFT			1
> -#define  WIN_TYPE_MASK			0x3
> -#define  WIN_SIZE_SHIFT			10
> -#define  WIN_SIZE_MASK			0x3fffff
> -
> -#define PAB_EXT_AXI_AMAP_SIZE(win)	PAB_EXT_REG_ADDR(0xbaf0,
> win)
> -
> -#define PAB_EXT_AXI_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0x80a0,
> win)
> -#define PAB_AXI_AMAP_AXI_WIN(win)	PAB_REG_ADDR(0x0ba4, win)
> -#define  AXI_WINDOW_ALIGN_MASK		3
> -
> -#define PAB_AXI_AMAP_PEX_WIN_L(win)	PAB_REG_ADDR(0x0ba8, win)
> -#define  PAB_BUS_SHIFT			24
> -#define  PAB_DEVICE_SHIFT		19
> -#define  PAB_FUNCTION_SHIFT		16
> -
> -#define PAB_AXI_AMAP_PEX_WIN_H(win)	PAB_REG_ADDR(0x0bac, win)
> -#define PAB_INTP_AXI_PIO_CLASS		0x474
> -
> -#define PAB_PEX_AMAP_CTRL(win)		PAB_REG_ADDR(0x4ba0, win)
> -#define  AMAP_CTRL_EN_SHIFT		0
> -#define  AMAP_CTRL_TYPE_SHIFT		1
> -#define  AMAP_CTRL_TYPE_MASK		3
> -
> -#define PAB_EXT_PEX_AMAP_SIZEN(win)	PAB_EXT_REG_ADDR(0xbef0,
> win)
> -#define PAB_EXT_PEX_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0xb4a0,
> win)
> -#define PAB_PEX_AMAP_AXI_WIN(win)	PAB_REG_ADDR(0x4ba4, win)
> -#define PAB_PEX_AMAP_PEX_WIN_L(win)	PAB_REG_ADDR(0x4ba8, win)
> -#define PAB_PEX_AMAP_PEX_WIN_H(win)	PAB_REG_ADDR(0x4bac, win)
> -
> -/* starting offset of INTX bits in status register */
> -#define PAB_INTX_START			5
> -
> -/* supported number of MSI interrupts */
> -#define PCI_NUM_MSI			16
> -
> -/* MSI registers */
> -#define MSI_BASE_LO_OFFSET		0x04
> -#define MSI_BASE_HI_OFFSET		0x08
> -#define MSI_SIZE_OFFSET			0x0c
> -#define MSI_ENABLE_OFFSET		0x14
> -#define MSI_STATUS_OFFSET		0x18
> -#define MSI_DATA_OFFSET			0x20
> -#define MSI_ADDR_L_OFFSET		0x24
> -#define MSI_ADDR_H_OFFSET		0x28
> -
> -/* outbound and inbound window definitions */
> -#define WIN_NUM_0			0
> -#define WIN_NUM_1			1
> -#define CFG_WINDOW_TYPE			0
> -#define IO_WINDOW_TYPE			1
> -#define MEM_WINDOW_TYPE			2
> -#define IB_WIN_SIZE			((u64)256 * 1024 * 1024 * 1024)
> -#define MAX_PIO_WINDOWS			8
> -
> -/* Parameters for the waiting for link up routine */
> -#define LINK_WAIT_MAX_RETRIES		10
> -#define LINK_WAIT_MIN			90000
> -#define LINK_WAIT_MAX			100000
> -
> -#define PAGED_ADDR_BNDRY		0xc00
> -#define OFFSET_TO_PAGE_ADDR(off)	\
> -	((off & PAGE_LO_MASK) | PAGED_ADDR_BNDRY)
> -#define OFFSET_TO_PAGE_IDX(off)		\
> -	((off >> PAGE_SEL_OFFSET_SHIFT) & PAGE_SEL_MASK)
> -
> -struct mobiveil_msi {			/* MSI information */
> -	struct mutex lock;		/* protect bitmap variable */
> -	struct irq_domain *msi_domain;
> -	struct irq_domain *dev_domain;
> -	phys_addr_t msi_pages_phys;
> -	int num_of_vectors;
> -	DECLARE_BITMAP(msi_irq_in_use, PCI_NUM_MSI);
> -};
> -
> -struct mobiveil_pcie {
> -	struct platform_device *pdev;
> -	struct list_head resources;
> -	void __iomem *config_axi_slave_base;	/* endpoint config base */
> -	void __iomem *csr_axi_slave_base;	/* root port config base */
> -	void __iomem *apb_csr_base;	/* MSI register base */
> -	phys_addr_t pcie_reg_base;	/* Physical PCIe Controller Base */
> -	struct irq_domain *intx_domain;
> -	raw_spinlock_t intx_mask_lock;
> -	int irq;
> -	int apio_wins;
> -	int ppio_wins;
> -	int ob_wins_configured;		/* configured outbound
> windows */
> -	int ib_wins_configured;		/* configured inbound windows */
> -	struct resource *ob_io_res;
> -	char root_bus_nr;
> -	struct mobiveil_msi msi;
> -};
> -
> -/*
> - * mobiveil_pcie_sel_page - routine to access paged register
> - *
> - * Registers whose address greater than PAGED_ADDR_BNDRY (0xc00) are
> paged,
> - * for this scheme to work extracted higher 6 bits of the offset will be
> - * written to pg_sel field of PAB_CTRL register and rest of the lower 10
> - * bits enabled with PAGED_ADDR_BNDRY are used as offset of the register.
> - */
> -static void mobiveil_pcie_sel_page(struct mobiveil_pcie *pcie, u8 pg_idx) -{
> -	u32 val;
> -
> -	val = readl(pcie->csr_axi_slave_base + PAB_CTRL);
> -	val &= ~(PAGE_SEL_MASK << PAGE_SEL_SHIFT);
> -	val |= (pg_idx & PAGE_SEL_MASK) << PAGE_SEL_SHIFT;
> -
> -	writel(val, pcie->csr_axi_slave_base + PAB_CTRL);
> -}
> -
> -static void *mobiveil_pcie_comp_addr(struct mobiveil_pcie *pcie, u32 off) -{
> -	if (off < PAGED_ADDR_BNDRY) {
> -		/* For directly accessed registers, clear the pg_sel field */
> -		mobiveil_pcie_sel_page(pcie, 0);
> -		return pcie->csr_axi_slave_base + off;
> -	}
> -
> -	mobiveil_pcie_sel_page(pcie, OFFSET_TO_PAGE_IDX(off));
> -	return pcie->csr_axi_slave_base + OFFSET_TO_PAGE_ADDR(off);
> -}
> -
> -static int mobiveil_pcie_read(void __iomem *addr, int size, u32 *val) -{
> -	if ((uintptr_t)addr & (size - 1)) {
> -		*val = 0;
> -		return PCIBIOS_BAD_REGISTER_NUMBER;
> -	}
> -
> -	switch (size) {
> -	case 4:
> -		*val = readl(addr);
> -		break;
> -	case 2:
> -		*val = readw(addr);
> -		break;
> -	case 1:
> -		*val = readb(addr);
> -		break;
> -	default:
> -		*val = 0;
> -		return PCIBIOS_BAD_REGISTER_NUMBER;
> -	}
> -
> -	return PCIBIOS_SUCCESSFUL;
> -}
> -
> -static int mobiveil_pcie_write(void __iomem *addr, int size, u32 val) -{
> -	if ((uintptr_t)addr & (size - 1))
> -		return PCIBIOS_BAD_REGISTER_NUMBER;
> -
> -	switch (size) {
> -	case 4:
> -		writel(val, addr);
> -		break;
> -	case 2:
> -		writew(val, addr);
> -		break;
> -	case 1:
> -		writeb(val, addr);
> -		break;
> -	default:
> -		return PCIBIOS_BAD_REGISTER_NUMBER;
> -	}
> -
> -	return PCIBIOS_SUCCESSFUL;
> -}
> -
> -static u32 csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size) -{
> -	void *addr;
> -	u32 val;
> -	int ret;
> -
> -	addr = mobiveil_pcie_comp_addr(pcie, off);
> -
> -	ret = mobiveil_pcie_read(addr, size, &val);
> -	if (ret)
> -		dev_err(&pcie->pdev->dev, "read CSR address failed\n");
> -
> -	return val;
> -}
> -
> -static void csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off, size_t size) -
> {
> -	void *addr;
> -	int ret;
> -
> -	addr = mobiveil_pcie_comp_addr(pcie, off);
> -
> -	ret = mobiveil_pcie_write(addr, size, val);
> -	if (ret)
> -		dev_err(&pcie->pdev->dev, "write CSR address failed\n");
> -}
> -
> -static u32 csr_readl(struct mobiveil_pcie *pcie, u32 off) -{
> -	return csr_read(pcie, off, 0x4);
> -}
> -
> -static void csr_writel(struct mobiveil_pcie *pcie, u32 val, u32 off) -{
> -	csr_write(pcie, val, off, 0x4);
> -}
> -
> -static bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie) -{
> -	return (csr_readl(pcie, LTSSM_STATUS) &
> -		LTSSM_STATUS_L0_MASK) == LTSSM_STATUS_L0;
> -}
> +#include "pcie-mobiveil.h"
> 
>  static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int
> devfn)  {
>  	struct mobiveil_pcie *pcie = bus->sysdata;
> 
>  	/* Only one device down on each root port */
> -	if ((bus->number == pcie->root_bus_nr) && (devfn > 0))
> +	if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0))
>  		return false;
> 
>  	/*
>  	 * Do not read more than one device on the bus directly
>  	 * attached to RC
>  	 */
> -	if ((bus->primary == pcie->root_bus_nr) && (devfn > 0))
> +	if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0))
>  		return false;
> 
>  	return true;
> @@ -311,7 +57,7 @@ static void __iomem *mobiveil_pcie_map_bus(struct
> pci_bus *bus,
>  		return NULL;
> 
>  	/* RC config access */
> -	if (bus->number == pcie->root_bus_nr)
> +	if (bus->number == pcie->rp.root_bus_nr)
>  		return pcie->csr_axi_slave_base + where;
> 
>  	/*
> @@ -326,7 +72,7 @@ static void __iomem *mobiveil_pcie_map_bus(struct
> pci_bus *bus,
> 
>  	csr_writel(pcie, value, PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0));
> 
> -	return pcie->config_axi_slave_base + where;
> +	return pcie->rp.config_axi_slave_base + where;
>  }
> 
>  static struct pci_ops mobiveil_pcie_ops = { @@ -340,7 +86,7 @@ static void
> mobiveil_pcie_isr(struct irq_desc *desc)
>  	struct irq_chip *chip = irq_desc_get_chip(desc);
>  	struct mobiveil_pcie *pcie = irq_desc_get_handler_data(desc);
>  	struct device *dev = &pcie->pdev->dev;
> -	struct mobiveil_msi *msi = &pcie->msi;
> +	struct mobiveil_msi *msi = &pcie->rp.msi;
>  	u32 msi_data, msi_addr_lo, msi_addr_hi;
>  	u32 intr_status, msi_status;
>  	unsigned long shifted_status;
> @@ -365,7 +111,7 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
>  		shifted_status >>= PAB_INTX_START;
>  		do {
>  			for_each_set_bit(bit, &shifted_status,
> PCI_NUM_INTX) {
> -				virq = irq_find_mapping(pcie->intx_domain,
> +				virq = irq_find_mapping(pcie-
> >rp.intx_domain,
>  							bit + 1);
>  				if (virq)
>  					generic_handle_irq(virq);
> @@ -428,10 +174,10 @@ static int mobiveil_pcie_parse_dt(struct
> mobiveil_pcie *pcie)
>  	/* map config resource */
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>  					   "config_axi_slave");
> -	pcie->config_axi_slave_base = devm_pci_remap_cfg_resource(dev,
> res);
> -	if (IS_ERR(pcie->config_axi_slave_base))
> -		return PTR_ERR(pcie->config_axi_slave_base);
> -	pcie->ob_io_res = res;
> +	pcie->rp.config_axi_slave_base = devm_pci_remap_cfg_resource(dev,
> res);
> +	if (IS_ERR(pcie->rp.config_axi_slave_base))
> +		return PTR_ERR(pcie->rp.config_axi_slave_base);
> +	pcie->rp.ob_io_res = res;
> 
>  	/* map csr resource */
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> @@ -441,12 +187,6 @@ static int mobiveil_pcie_parse_dt(struct
> mobiveil_pcie *pcie)
>  		return PTR_ERR(pcie->csr_axi_slave_base);
>  	pcie->pcie_reg_base = res->start;
> 
> -	/* map MSI config resource */
> -	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> "apb_csr");
> -	pcie->apb_csr_base = devm_pci_remap_cfg_resource(dev, res);
> -	if (IS_ERR(pcie->apb_csr_base))
> -		return PTR_ERR(pcie->apb_csr_base);
> -
>  	/* read the number of windows requested */
>  	if (of_property_read_u32(node, "apio-wins", &pcie->apio_wins))
>  		pcie->apio_wins = MAX_PIO_WINDOWS;
> @@ -454,119 +194,15 @@ static int mobiveil_pcie_parse_dt(struct
> mobiveil_pcie *pcie)
>  	if (of_property_read_u32(node, "ppio-wins", &pcie->ppio_wins))
>  		pcie->ppio_wins = MAX_PIO_WINDOWS;
> 
> -	pcie->irq = platform_get_irq(pdev, 0);
> -	if (pcie->irq <= 0) {
> -		dev_err(dev, "failed to map IRQ: %d\n", pcie->irq);
> -		return -ENODEV;
> -	}
> -
>  	return 0;
>  }
> 
> -static void program_ib_windows(struct mobiveil_pcie *pcie, int win_num,
> -			       u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
> -{
> -	u32 value;
> -	u64 size64 = ~(size - 1);
> -
> -	if (win_num >= pcie->ppio_wins) {
> -		dev_err(&pcie->pdev->dev,
> -			"ERROR: max inbound windows reached !\n");
> -		return;
> -	}
> -
> -	value = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> -	value &= ~(AMAP_CTRL_TYPE_MASK << AMAP_CTRL_TYPE_SHIFT |
> -		 WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> -	value |= (type << AMAP_CTRL_TYPE_SHIFT) | (1 <<
> AMAP_CTRL_EN_SHIFT) |
> -		 (lower_32_bits(size64) & WIN_SIZE_MASK <<
> WIN_SIZE_SHIFT);
> -	csr_writel(pcie, value, PAB_PEX_AMAP_CTRL(win_num));
> -
> -	csr_writel(pcie, upper_32_bits(size64),
> -		   PAB_EXT_PEX_AMAP_SIZEN(win_num));
> -
> -	csr_writel(pcie, lower_32_bits(cpu_addr),
> -		   PAB_PEX_AMAP_AXI_WIN(win_num));
> -	csr_writel(pcie, upper_32_bits(cpu_addr),
> -		   PAB_EXT_PEX_AMAP_AXI_WIN(win_num));
> -
> -	csr_writel(pcie, lower_32_bits(pci_addr),
> -		   PAB_PEX_AMAP_PEX_WIN_L(win_num));
> -	csr_writel(pcie, upper_32_bits(pci_addr),
> -		   PAB_PEX_AMAP_PEX_WIN_H(win_num));
> -
> -	pcie->ib_wins_configured++;
> -}
> -
> -/*
> - * routine to program the outbound windows
> - */
> -static void program_ob_windows(struct mobiveil_pcie *pcie, int win_num,
> -			       u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
> -{
> -
> -	u32 value;
> -	u64 size64 = ~(size - 1);
> -
> -	if (win_num >= pcie->apio_wins) {
> -		dev_err(&pcie->pdev->dev,
> -			"ERROR: max outbound windows reached !\n");
> -		return;
> -	}
> -
> -	/*
> -	 * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size
> Bit
> -	 * to 4 KB in PAB_AXI_AMAP_CTRL register
> -	 */
> -	value = csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));
> -	value &= ~(WIN_TYPE_MASK << WIN_TYPE_SHIFT |
> -		 WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> -	value |= 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |
> -		 (lower_32_bits(size64) & WIN_SIZE_MASK <<
> WIN_SIZE_SHIFT);
> -	csr_writel(pcie, value, PAB_AXI_AMAP_CTRL(win_num));
> -
> -	csr_writel(pcie, upper_32_bits(size64),
> PAB_EXT_AXI_AMAP_SIZE(win_num));
> -
> -	/*
> -	 * program AXI window base with appropriate value in
> -	 * PAB_AXI_AMAP_AXI_WIN0 register
> -	 */
> -	csr_writel(pcie, lower_32_bits(cpu_addr) &
> (~AXI_WINDOW_ALIGN_MASK),
> -		   PAB_AXI_AMAP_AXI_WIN(win_num));
> -	csr_writel(pcie, upper_32_bits(cpu_addr),
> -		   PAB_EXT_AXI_AMAP_AXI_WIN(win_num));
> -
> -	csr_writel(pcie, lower_32_bits(pci_addr),
> -		   PAB_AXI_AMAP_PEX_WIN_L(win_num));
> -	csr_writel(pcie, upper_32_bits(pci_addr),
> -		   PAB_AXI_AMAP_PEX_WIN_H(win_num));
> -
> -	pcie->ob_wins_configured++;
> -}
> -
> -static int mobiveil_bringup_link(struct mobiveil_pcie *pcie) -{
> -	int retries;
> -
> -	/* check if the link is up or not */
> -	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
> -		if (mobiveil_pcie_link_up(pcie))
> -			return 0;
> -
> -		usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX);
> -	}
> -
> -	dev_err(&pcie->pdev->dev, "link never came up\n");
> -
> -	return -ETIMEDOUT;
> -}
> -
>  static void mobiveil_pcie_enable_msi(struct mobiveil_pcie *pcie)  {
>  	phys_addr_t msg_addr = pcie->pcie_reg_base;
> -	struct mobiveil_msi *msi = &pcie->msi;
> +	struct mobiveil_msi *msi = &pcie->rp.msi;
> 
> -	pcie->msi.num_of_vectors = PCI_NUM_MSI;
> +	msi->num_of_vectors = PCI_NUM_MSI;
>  	msi->msi_pages_phys = (phys_addr_t)msg_addr;
> 
>  	writel_relaxed(lower_32_bits(msg_addr),
> @@ -604,9 +240,6 @@ static int mobiveil_host_init(struct mobiveil_pcie
> *pcie)
>  	pab_ctrl |= (1 << AMBA_PIO_ENABLE_SHIFT) | (1 <<
> PEX_PIO_ENABLE_SHIFT);
>  	csr_writel(pcie, pab_ctrl, PAB_CTRL);
> 
> -	csr_writel(pcie, (PAB_INTP_INTX_MASK | PAB_INTP_MSI_MASK),
> -		   PAB_INTP_AMBA_MISC_ENB);
> -
>  	/*
>  	 * program PIO Enable Bit to 1 and Config Window Enable Bit to 1 in
>  	 * PAB_AXI_PIO_CTRL Register
> @@ -628,20 +261,24 @@ static int mobiveil_host_init(struct mobiveil_pcie
> *pcie)
>  	 */
> 
>  	/* config outbound translation window */
> -	program_ob_windows(pcie, WIN_NUM_0, pcie->ob_io_res->start, 0,
> -			   CFG_WINDOW_TYPE, resource_size(pcie-
> >ob_io_res));
> +	program_ob_windows(pcie, WIN_NUM_0, pcie->rp.ob_io_res->start,
> 0,
> +			   CFG_WINDOW_TYPE, resource_size(pcie-
> >rp.ob_io_res));
> 
>  	/* memory inbound translation window */
>  	program_ib_windows(pcie, WIN_NUM_0, 0, 0,
> MEM_WINDOW_TYPE, IB_WIN_SIZE);
> 
>  	/* Get the I/O and memory ranges from DT */
>  	resource_list_for_each_entry(win, &pcie->resources) {
> -		if (resource_type(win->res) == IORESOURCE_MEM)
> +		if (resource_type(win->res) == IORESOURCE_MEM) {
>  			type = MEM_WINDOW_TYPE;
> -		else if (resource_type(win->res) == IORESOURCE_IO)
> +		} else if (resource_type(win->res) == IORESOURCE_IO) {
>  			type = IO_WINDOW_TYPE;
> -		else
> +		} else if (resource_type(win->res) == IORESOURCE_BUS) {
> +			pcie->rp.root_bus_nr = win->res->start;
> +			continue;
> +		} else {
>  			continue;
> +		}
> 
>  		/* configure outbound translation window */
>  		program_ob_windows(pcie, pcie->ob_wins_configured, @@
> -656,9 +293,6 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
>  	value |= (PCI_CLASS_BRIDGE_PCI << 16);
>  	csr_writel(pcie, value, PAB_INTP_AXI_PIO_CLASS);
> 
> -	/* setup MSI hardware registers */
> -	mobiveil_pcie_enable_msi(pcie);
> -
>  	return 0;
>  }
> 
> @@ -671,11 +305,11 @@ static void mobiveil_mask_intx_irq(struct irq_data
> *data)
> 
>  	pcie = irq_desc_get_chip_data(desc);
>  	mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
> -	raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
> +	raw_spin_lock_irqsave(&pcie->rp.intx_mask_lock, flags);
>  	shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
>  	shifted_val &= ~mask;
>  	csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB);
> -	raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
> +	raw_spin_unlock_irqrestore(&pcie->rp.intx_mask_lock, flags);
>  }
> 
>  static void mobiveil_unmask_intx_irq(struct irq_data *data) @@ -687,11
> +321,11 @@ static void mobiveil_unmask_intx_irq(struct irq_data *data)
> 
>  	pcie = irq_desc_get_chip_data(desc);
>  	mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
> -	raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
> +	raw_spin_lock_irqsave(&pcie->rp.intx_mask_lock, flags);
>  	shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
>  	shifted_val |= mask;
>  	csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB);
> -	raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
> +	raw_spin_unlock_irqrestore(&pcie->rp.intx_mask_lock, flags);
>  }
> 
>  static struct irq_chip intx_irq_chip = { @@ -759,7 +393,7 @@ static int
> mobiveil_irq_msi_domain_alloc(struct irq_domain *domain,
>  					 unsigned int nr_irqs, void *args)  {
>  	struct mobiveil_pcie *pcie = domain->host_data;
> -	struct mobiveil_msi *msi = &pcie->msi;
> +	struct mobiveil_msi *msi = &pcie->rp.msi;
>  	unsigned long bit;
> 
>  	WARN_ON(nr_irqs != 1);
> @@ -786,7 +420,7 @@ static void mobiveil_irq_msi_domain_free(struct
> irq_domain *domain,  {
>  	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
>  	struct mobiveil_pcie *pcie = irq_data_get_irq_chip_data(d);
> -	struct mobiveil_msi *msi = &pcie->msi;
> +	struct mobiveil_msi *msi = &pcie->rp.msi;
> 
>  	mutex_lock(&msi->lock);
> 
> @@ -807,9 +441,9 @@ static int mobiveil_allocate_msi_domains(struct
> mobiveil_pcie *pcie)  {
>  	struct device *dev = &pcie->pdev->dev;
>  	struct fwnode_handle *fwnode = of_node_to_fwnode(dev-
> >of_node);
> -	struct mobiveil_msi *msi = &pcie->msi;
> +	struct mobiveil_msi *msi = &pcie->rp.msi;
> 
> -	mutex_init(&pcie->msi.lock);
> +	mutex_init(&msi->lock);
>  	msi->dev_domain = irq_domain_add_linear(NULL, msi-
> >num_of_vectors,
>  						&msi_domain_ops, pcie);
>  	if (!msi->dev_domain) {
> @@ -836,15 +470,15 @@ static int mobiveil_pcie_init_irq_domain(struct
> mobiveil_pcie *pcie)
>  	int ret;
> 
>  	/* setup INTx */
> -	pcie->intx_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> -						  &intx_domain_ops, pcie);
> +	pcie->rp.intx_domain = irq_domain_add_linear(node,
> PCI_NUM_INTX,
> +						     &intx_domain_ops, pcie);
> 
> -	if (!pcie->intx_domain) {
> +	if (!pcie->rp.intx_domain) {
>  		dev_err(dev, "Failed to get a INTx IRQ domain\n");
>  		return -ENOMEM;
>  	}
> 
> -	raw_spin_lock_init(&pcie->intx_mask_lock);
> +	raw_spin_lock_init(&pcie->rp.intx_mask_lock);
> 
>  	/* setup MSI */
>  	ret = mobiveil_allocate_msi_domains(pcie);
> @@ -854,24 +488,58 @@ static int mobiveil_pcie_init_irq_domain(struct
> mobiveil_pcie *pcie)
>  	return 0;
>  }
> 
> -static int mobiveil_pcie_probe(struct platform_device *pdev)
> +static int mobiveil_pcie_interrupt_init(struct mobiveil_pcie *pcie) {
> +	struct device *dev = &pcie->pdev->dev;
> +	struct resource *res;
> +	int ret;
> +
> +	if (pcie->rp.ops->interrupt_init)
> +		return pcie->rp.ops->interrupt_init(pcie);
> +
> +	/* map MSI config resource */
> +	res = platform_get_resource_byname(pcie->pdev,
> IORESOURCE_MEM,
> +					   "apb_csr");
> +	pcie->apb_csr_base = devm_pci_remap_cfg_resource(dev, res);
> +	if (IS_ERR(pcie->apb_csr_base))
> +		return PTR_ERR(pcie->apb_csr_base);
> +
> +	/* setup MSI hardware registers */
> +	mobiveil_pcie_enable_msi(pcie);
> +
> +	pcie->rp.irq = platform_get_irq(pcie->pdev, 0);
> +	if (pcie->rp.irq <= 0) {
> +		dev_err(dev, "failed to map IRQ: %d\n", pcie->rp.irq);
> +		return -ENODEV;
> +	}
> +
> +	/* initialize the IRQ domains */
> +	ret = mobiveil_pcie_init_irq_domain(pcie);
> +	if (ret) {
> +		dev_err(dev, "Failed creating IRQ Domain\n");
> +		return ret;
> +	}
> +
> +	irq_set_chained_handler_and_data(pcie->rp.irq,
> +					 mobiveil_pcie_isr, pcie);
> +
> +	/* Enable interrupts */
> +	csr_writel(pcie, (PAB_INTP_INTX_MASK | PAB_INTP_MSI_MASK),
> +		   PAB_INTP_AMBA_MISC_ENB);
> +
> +	return 0;
> +}
> +
> +int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
>  {
> -	struct mobiveil_pcie *pcie;
>  	struct pci_bus *bus;
>  	struct pci_bus *child;
>  	struct pci_host_bridge *bridge;
> -	struct device *dev = &pdev->dev;
> +	struct device *dev = &pcie->pdev->dev;
>  	resource_size_t iobase;
>  	int ret;
> 
> -	/* allocate the PCIe port */
> -	bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
> -	if (!bridge)
> -		return -ENOMEM;
> -
> -	pcie = pci_host_bridge_priv(bridge);
> -
> -	pcie->pdev = pdev;
> +	INIT_LIST_HEAD(&pcie->resources);
> 
>  	ret = mobiveil_pcie_parse_dt(pcie);
>  	if (ret) {
> @@ -879,7 +547,10 @@ static int mobiveil_pcie_probe(struct
> platform_device *pdev)
>  		return ret;
>  	}
> 
> -	INIT_LIST_HEAD(&pcie->resources);
> +	/* allocate the PCIe port */
> +	bridge = devm_pci_alloc_host_bridge(dev, 0);
> +	if (!bridge)
> +		return -ENOMEM;
> 
>  	/* parse the host bridge base addresses from the device tree file */
>  	ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, @@ -
> 899,15 +570,12 @@ static int mobiveil_pcie_probe(struct platform_device
> *pdev)
>  		goto error;
>  	}
> 
> -	/* initialize the IRQ domains */
> -	ret = mobiveil_pcie_init_irq_domain(pcie);
> +	ret = mobiveil_pcie_interrupt_init(pcie);
>  	if (ret) {
> -		dev_err(dev, "Failed creating IRQ Domain\n");
> +		dev_err(dev, "Interrupt init failed\n");
>  		goto error;
>  	}
> 
> -	irq_set_chained_handler_and_data(pcie->irq, mobiveil_pcie_isr,
> pcie);
> -
>  	ret = devm_request_pci_bus_resources(dev, &pcie->resources);
>  	if (ret)
>  		goto error;
> @@ -916,7 +584,7 @@ static int mobiveil_pcie_probe(struct platform_device
> *pdev)
>  	list_splice_init(&pcie->resources, &bridge->windows);
>  	bridge->dev.parent = dev;
>  	bridge->sysdata = pcie;
> -	bridge->busnr = pcie->root_bus_nr;
> +	bridge->busnr = pcie->rp.root_bus_nr;
>  	bridge->ops = &mobiveil_pcie_ops;
>  	bridge->map_irq = of_irq_parse_and_map_pci;
>  	bridge->swizzle_irq = pci_common_swizzle; @@ -944,25 +612,3 @@
> static int mobiveil_pcie_probe(struct platform_device *pdev)
>  	pci_free_resource_list(&pcie->resources);
>  	return ret;
>  }
> -
> -static const struct of_device_id mobiveil_pcie_of_match[] = {
> -	{.compatible = "mbvl,gpex40-pcie",},
> -	{},
> -};
> -
> -MODULE_DEVICE_TABLE(of, mobiveil_pcie_of_match);
> -
> -static struct platform_driver mobiveil_pcie_driver = {
> -	.probe = mobiveil_pcie_probe,
> -	.driver = {
> -		.name = "mobiveil-pcie",
> -		.of_match_table = mobiveil_pcie_of_match,
> -		.suppress_bind_attrs = true,
> -	},
> -};
> -
> -builtin_platform_driver(mobiveil_pcie_driver);
> -
> -MODULE_LICENSE("GPL v2");
> -MODULE_DESCRIPTION("Mobiveil PCIe host controller driver"); -
> MODULE_AUTHOR("Subrahmanya Lingappa
> <l.subrahmanya@mobiveil.co.in>"); diff --git
> a/drivers/pci/controller/mobiveil/pcie-mobiveil-plat.c
> b/drivers/pci/controller/mobiveil/pcie-mobiveil-plat.c
> new file mode 100644
> index 000000000000..216c62f35568
> --- /dev/null
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-plat.c
> @@ -0,0 +1,54 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Mobiveil PCIe Host controller
> + *
> + * Copyright (c) 2018 Mobiveil Inc.
> + * Author: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
> + * Refactor: Zhiqiang Hou <Zhiqiang.Hou@nxp.com>  */
> +
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_pci.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#include "pcie-mobiveil.h"
> +
> +static int mobiveil_pcie_probe(struct platform_device *pdev) {
> +	struct mobiveil_pcie *pcie;
> +	struct device *dev = &pdev->dev;
> +
> +	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
> +	if (!pcie)
> +		return -ENOMEM;
> +
> +	pcie->pdev = pdev;
> +
> +	return mobiveil_pcie_host_probe(pcie); }
> +
> +static const struct of_device_id mobiveil_pcie_of_match[] = {
> +	{.compatible = "mbvl,gpex40-pcie",},
> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(of, mobiveil_pcie_of_match);
> +
> +static struct platform_driver mobiveil_pcie_driver = {
> +	.probe = mobiveil_pcie_probe,
> +	.driver = {
> +		.name = "mobiveil-pcie",
> +		.of_match_table = mobiveil_pcie_of_match,
> +		.suppress_bind_attrs = true,
> +	},
> +};
> +
> +builtin_platform_driver(mobiveil_pcie_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Mobiveil PCIe host controller driver");
> +MODULE_AUTHOR("Subrahmanya Lingappa
> <l.subrahmanya@mobiveil.co.in>");
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> new file mode 100644
> index 000000000000..ee678a60825d
> --- /dev/null
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
> @@ -0,0 +1,228 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Mobiveil PCIe Host controller
> + *
> + * Copyright (c) 2018 Mobiveil Inc.
> + * Author: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
> + * Refactor: Zhiqiang Hou <Zhiqiang.Hou@nxp.com>  */
> +
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +
> +#include "pcie-mobiveil.h"
> +
> +/*
> + * mobiveil_pcie_sel_page - routine to access paged register
> + *
> + * Registers whose address greater than PAGED_ADDR_BNDRY (0xc00) are
> +paged,
> + * for this scheme to work extracted higher 6 bits of the offset will
> +be
> + * written to pg_sel field of PAB_CTRL register and rest of the lower
> +10
> + * bits enabled with PAGED_ADDR_BNDRY are used as offset of the register.
> + */
> +static void mobiveil_pcie_sel_page(struct mobiveil_pcie *pcie, u8
> +pg_idx) {
> +	u32 val;
> +
> +	val = readl(pcie->csr_axi_slave_base + PAB_CTRL);
> +	val &= ~(PAGE_SEL_MASK << PAGE_SEL_SHIFT);
> +	val |= (pg_idx & PAGE_SEL_MASK) << PAGE_SEL_SHIFT;
> +
> +	writel(val, pcie->csr_axi_slave_base + PAB_CTRL); }
> +
> +static void *mobiveil_pcie_comp_addr(struct mobiveil_pcie *pcie, u32
> +off) {
> +	if (off < PAGED_ADDR_BNDRY) {
> +		/* For directly accessed registers, clear the pg_sel field */
> +		mobiveil_pcie_sel_page(pcie, 0);
> +		return pcie->csr_axi_slave_base + off;
> +	}
> +
> +	mobiveil_pcie_sel_page(pcie, OFFSET_TO_PAGE_IDX(off));
> +	return pcie->csr_axi_slave_base + OFFSET_TO_PAGE_ADDR(off); }
> +
> +static int mobiveil_pcie_read(void __iomem *addr, int size, u32 *val) {
> +	if ((uintptr_t)addr & (size - 1)) {
> +		*val = 0;
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> +	}
> +
> +	switch (size) {
> +	case 4:
> +		*val = readl(addr);
> +		break;
> +	case 2:
> +		*val = readw(addr);
> +		break;
> +	case 1:
> +		*val = readb(addr);
> +		break;
> +	default:
> +		*val = 0;
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> +	}
> +
> +	return PCIBIOS_SUCCESSFUL;
> +}
> +
> +static int mobiveil_pcie_write(void __iomem *addr, int size, u32 val) {
> +	if ((uintptr_t)addr & (size - 1))
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> +	switch (size) {
> +	case 4:
> +		writel(val, addr);
> +		break;
> +	case 2:
> +		writew(val, addr);
> +		break;
> +	case 1:
> +		writeb(val, addr);
> +		break;
> +	default:
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> +	}
> +
> +	return PCIBIOS_SUCCESSFUL;
> +}
> +
> +u32 csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size) {
> +	void *addr;
> +	u32 val;
> +	int ret;
> +
> +	addr = mobiveil_pcie_comp_addr(pcie, off);
> +
> +	ret = mobiveil_pcie_read(addr, size, &val);
> +	if (ret)
> +		dev_err(&pcie->pdev->dev, "read CSR address failed\n");
> +
> +	return val;
> +}
> +
> +void csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off, size_t
> +size) {
> +	void *addr;
> +	int ret;
> +
> +	addr = mobiveil_pcie_comp_addr(pcie, off);
> +
> +	ret = mobiveil_pcie_write(addr, size, val);
> +	if (ret)
> +		dev_err(&pcie->pdev->dev, "write CSR address failed\n"); }
> +
> +bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie) {
> +	if (pcie->ops->link_up)
> +		return pcie->ops->link_up(pcie);
> +
> +	return (csr_readl(pcie, LTSSM_STATUS) &
> +		LTSSM_STATUS_L0_MASK) == LTSSM_STATUS_L0; }
> +
> +void program_ib_windows(struct mobiveil_pcie *pcie, int win_num, u64
> cpu_addr,
> +			u64 pci_addr, u32 type, u64 size)
> +{
> +	u32 value;
> +	u64 size64 = ~(size - 1);
> +
> +	if (win_num >= pcie->ppio_wins) {
> +		dev_err(&pcie->pdev->dev,
> +			"ERROR: max inbound windows reached !\n");
> +		return;
> +	}
> +
> +	value = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> +	value &= ~(AMAP_CTRL_TYPE_MASK << AMAP_CTRL_TYPE_SHIFT |
> +		 WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> +	value |= (type << AMAP_CTRL_TYPE_SHIFT) | (1 <<
> AMAP_CTRL_EN_SHIFT) |
> +		 (lower_32_bits(size64) & WIN_SIZE_MASK <<
> WIN_SIZE_SHIFT);
> +	csr_writel(pcie, value, PAB_PEX_AMAP_CTRL(win_num));
> +
> +	csr_writel(pcie, upper_32_bits(size64),
> +		   PAB_EXT_PEX_AMAP_SIZEN(win_num));
> +
> +	csr_writel(pcie, lower_32_bits(cpu_addr),
> +		   PAB_PEX_AMAP_AXI_WIN(win_num));
> +	csr_writel(pcie, upper_32_bits(cpu_addr),
> +		   PAB_EXT_PEX_AMAP_AXI_WIN(win_num));
> +
> +	csr_writel(pcie, lower_32_bits(pci_addr),
> +		   PAB_PEX_AMAP_PEX_WIN_L(win_num));
> +	csr_writel(pcie, upper_32_bits(pci_addr),
> +		   PAB_PEX_AMAP_PEX_WIN_H(win_num));
> +
> +	pcie->ib_wins_configured++;
> +}
> +
> +/*
> + * routine to program the outbound windows  */ void
> +program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64
> cpu_addr,
> +			u64 pci_addr, u32 type, u64 size)
> +{
> +
> +	u32 value;
> +	u64 size64 = ~(size - 1);
> +
> +	if (win_num >= pcie->apio_wins) {
> +		dev_err(&pcie->pdev->dev,
> +			"ERROR: max outbound windows reached !\n");
> +		return;
> +	}
> +
> +	/*
> +	 * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size
> Bit
> +	 * to 4 KB in PAB_AXI_AMAP_CTRL register
> +	 */
> +	value = csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));
> +	value &= ~(WIN_TYPE_MASK << WIN_TYPE_SHIFT |
> +		 WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> +	value |= 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |
> +		 (lower_32_bits(size64) & WIN_SIZE_MASK <<
> WIN_SIZE_SHIFT);
> +	csr_writel(pcie, value, PAB_AXI_AMAP_CTRL(win_num));
> +
> +	csr_writel(pcie, upper_32_bits(size64),
> +PAB_EXT_AXI_AMAP_SIZE(win_num));
> +
> +	/*
> +	 * program AXI window base with appropriate value in
> +	 * PAB_AXI_AMAP_AXI_WIN0 register
> +	 */
> +	csr_writel(pcie, lower_32_bits(cpu_addr) &
> (~AXI_WINDOW_ALIGN_MASK),
> +		   PAB_AXI_AMAP_AXI_WIN(win_num));
> +	csr_writel(pcie, upper_32_bits(cpu_addr),
> +		   PAB_EXT_AXI_AMAP_AXI_WIN(win_num));
> +
> +	csr_writel(pcie, lower_32_bits(pci_addr),
> +		   PAB_AXI_AMAP_PEX_WIN_L(win_num));
> +	csr_writel(pcie, upper_32_bits(pci_addr),
> +		   PAB_AXI_AMAP_PEX_WIN_H(win_num));
> +
> +	pcie->ob_wins_configured++;
> +}
> +
> +int mobiveil_bringup_link(struct mobiveil_pcie *pcie) {
> +	int retries;
> +
> +	/* check if the link is up or not */
> +	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
> +		if (mobiveil_pcie_link_up(pcie))
> +			return 0;
> +
> +		usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX);
> +	}
> +
> +	dev_err(&pcie->pdev->dev, "link never came up\n");
> +
> +	return -ETIMEDOUT;
> +}
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> new file mode 100644
> index 000000000000..eb4cb61291a8
> --- /dev/null
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> @@ -0,0 +1,187 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * PCIe host controller driver for Mobiveil PCIe Host controller
> + *
> + * Copyright (c) 2018 Mobiveil Inc.
> + * Author: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
> + * Refactor: Zhiqiang Hou <Zhiqiang.Hou@nxp.com>  */
> +
> +#ifndef _PCIE_MOBIVEIL_H
> +#define _PCIE_MOBIVEIL_H
> +
> +#include <linux/pci.h>
> +#include <linux/irq.h>
> +#include <linux/msi.h>
> +#include "../../pci.h"
> +
> +/* register offsets and bit positions */
> +
> +/*
> + * translation tables are grouped into windows, each window registers
> +are
> + * grouped into blocks of 4 or 16 registers each  */
> +#define PAB_REG_BLOCK_SIZE		16
> +#define PAB_EXT_REG_BLOCK_SIZE		4
> +
> +#define PAB_REG_ADDR(offset, win)	\
> +	(offset + (win * PAB_REG_BLOCK_SIZE))
> +#define PAB_EXT_REG_ADDR(offset, win)	\
> +	(offset + (win * PAB_EXT_REG_BLOCK_SIZE))
> +
> +#define LTSSM_STATUS			0x0404
> +#define  LTSSM_STATUS_L0_MASK		0x3f
> +#define  LTSSM_STATUS_L0		0x2d
> +
> +#define PAB_CTRL			0x0808
> +#define  AMBA_PIO_ENABLE_SHIFT		0
> +#define  PEX_PIO_ENABLE_SHIFT		1
> +#define  PAGE_SEL_SHIFT			13
> +#define  PAGE_SEL_MASK			0x3f
> +#define  PAGE_LO_MASK			0x3ff
> +#define  PAGE_SEL_OFFSET_SHIFT		10
> +
> +#define PAB_AXI_PIO_CTRL		0x0840
> +#define  APIO_EN_MASK			0xf
> +
> +#define PAB_PEX_PIO_CTRL		0x08c0
> +#define  PIO_ENABLE_SHIFT		0
> +
> +#define PAB_INTP_AMBA_MISC_ENB		0x0b0c
> +#define PAB_INTP_AMBA_MISC_STAT		0x0b1c
> +#define  PAB_INTP_INTX_MASK		0x01e0
> +#define  PAB_INTP_MSI_MASK		0x8
> +
> +#define PAB_AXI_AMAP_CTRL(win)		PAB_REG_ADDR(0x0ba0, win)
> +#define  WIN_ENABLE_SHIFT		0
> +#define  WIN_TYPE_SHIFT			1
> +#define  WIN_TYPE_MASK			0x3
> +#define  WIN_SIZE_SHIFT			10
> +#define  WIN_SIZE_MASK			0x3fffff
> +
> +#define PAB_EXT_AXI_AMAP_SIZE(win)	PAB_EXT_REG_ADDR(0xbaf0,
> win)
> +
> +#define PAB_EXT_AXI_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0x80a0,
> win)
> +#define PAB_AXI_AMAP_AXI_WIN(win)	PAB_REG_ADDR(0x0ba4, win)
> +#define  AXI_WINDOW_ALIGN_MASK		3
> +
> +#define PAB_AXI_AMAP_PEX_WIN_L(win)	PAB_REG_ADDR(0x0ba8, win)
> +#define  PAB_BUS_SHIFT			24
> +#define  PAB_DEVICE_SHIFT		19
> +#define  PAB_FUNCTION_SHIFT		16
> +
> +#define PAB_AXI_AMAP_PEX_WIN_H(win)	PAB_REG_ADDR(0x0bac, win)
> +#define PAB_INTP_AXI_PIO_CLASS		0x474
> +
> +#define PAB_PEX_AMAP_CTRL(win)		PAB_REG_ADDR(0x4ba0, win)
> +#define  AMAP_CTRL_EN_SHIFT		0
> +#define  AMAP_CTRL_TYPE_SHIFT		1
> +#define  AMAP_CTRL_TYPE_MASK		3
> +
> +#define PAB_EXT_PEX_AMAP_SIZEN(win)	PAB_EXT_REG_ADDR(0xbef0,
> win)
> +#define PAB_EXT_PEX_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0xb4a0,
> win)
> +#define PAB_PEX_AMAP_AXI_WIN(win)	PAB_REG_ADDR(0x4ba4, win)
> +#define PAB_PEX_AMAP_PEX_WIN_L(win)	PAB_REG_ADDR(0x4ba8, win)
> +#define PAB_PEX_AMAP_PEX_WIN_H(win)	PAB_REG_ADDR(0x4bac, win)
> +
> +/* starting offset of INTX bits in status register */
> +#define PAB_INTX_START			5
> +
> +/* supported number of MSI interrupts */
> +#define PCI_NUM_MSI			16
> +
> +/* MSI registers */
> +#define MSI_BASE_LO_OFFSET		0x04
> +#define MSI_BASE_HI_OFFSET		0x08
> +#define MSI_SIZE_OFFSET			0x0c
> +#define MSI_ENABLE_OFFSET		0x14
> +#define MSI_STATUS_OFFSET		0x18
> +#define MSI_DATA_OFFSET			0x20
> +#define MSI_ADDR_L_OFFSET		0x24
> +#define MSI_ADDR_H_OFFSET		0x28
> +
> +/* outbound and inbound window definitions */
> +#define WIN_NUM_0			0
> +#define WIN_NUM_1			1
> +#define CFG_WINDOW_TYPE			0
> +#define IO_WINDOW_TYPE			1
> +#define MEM_WINDOW_TYPE			2
> +#define IB_WIN_SIZE			((u64)256 * 1024 * 1024 * 1024)
> +#define MAX_PIO_WINDOWS			8
> +
> +/* Parameters for the waiting for link up routine */
> +#define LINK_WAIT_MAX_RETRIES		10
> +#define LINK_WAIT_MIN			90000
> +#define LINK_WAIT_MAX			100000
> +
> +#define PAGED_ADDR_BNDRY		0xc00
> +#define OFFSET_TO_PAGE_ADDR(off)	\
> +	((off & PAGE_LO_MASK) | PAGED_ADDR_BNDRY)
> +#define OFFSET_TO_PAGE_IDX(off)		\
> +	((off >> PAGE_SEL_OFFSET_SHIFT) & PAGE_SEL_MASK)
> +
> +struct mobiveil_pcie;
> +
> +struct mobiveil_msi {			/* MSI information */
> +	struct mutex lock;		/* protect bitmap variable */
> +	struct irq_domain *msi_domain;
> +	struct irq_domain *dev_domain;
> +	phys_addr_t msi_pages_phys;
> +	int num_of_vectors;
> +	DECLARE_BITMAP(msi_irq_in_use, PCI_NUM_MSI); };
> +
> +struct mobiveil_rp_ops {
> +	int (*interrupt_init)(struct mobiveil_pcie *pcie); };
> +
> +struct root_port {
> +	u8 root_bus_nr;
> +	void __iomem *config_axi_slave_base;	/* endpoint config base */
> +	struct resource *ob_io_res;
> +	struct mobiveil_rp_ops *ops;
> +	int irq;
> +	raw_spinlock_t intx_mask_lock;
> +	struct irq_domain *intx_domain;
> +	struct mobiveil_msi msi;
> +};
> +
> +struct mobiveil_pab_ops {
> +	int (*link_up)(struct mobiveil_pcie *pcie); };
> +
> +struct mobiveil_pcie {
> +	struct platform_device *pdev;
> +	struct list_head resources;
> +	void __iomem *csr_axi_slave_base;	/* PAB registers base */
> +	phys_addr_t pcie_reg_base;	/* Physical PCIe Controller Base */
> +	void __iomem *apb_csr_base;	/* MSI register base */
> +	u32 apio_wins;
> +	u32 ppio_wins;
> +	u32 ob_wins_configured;		/* configured outbound
> windows */
> +	u32 ib_wins_configured;		/* configured inbound
> windows */
> +	const struct mobiveil_pab_ops *ops;
> +	struct root_port rp;
> +};
> +
> +int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie); bool
> +mobiveil_pcie_link_up(struct mobiveil_pcie *pcie); int
> +mobiveil_bringup_link(struct mobiveil_pcie *pcie); void
> +program_ob_windows(struct mobiveil_pcie *pcie, int win_num, u64
> cpu_addr,
> +			u64 pci_addr, u32 type, u64 size);
> +void program_ib_windows(struct mobiveil_pcie *pcie, int win_num, u64
> cpu_addr,
> +			u64 pci_addr, u32 type, u64 size);
> +u32 csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size); void
> +csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off, size_t size);
> +
> +static inline u32 csr_readl(struct mobiveil_pcie *pcie, u32 off) {
> +	return csr_read(pcie, off, 0x4);
> +}
> +
> +static inline void csr_writel(struct mobiveil_pcie *pcie, u32 val, u32
> +off) {
> +	csr_write(pcie, val, off, 0x4);
> +}
> +
> +#endif /* _PCIE_MOBIVEIL_H */
> --
> 2.17.1