Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 66aa51ce authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/host-faraday' into next 

* pci/host-faraday:
  PCI: faraday: Add Faraday Technology FTPCI100 PCI Host Bridge driver
  PCI: Add DT bindings for Faraday Technology PCI Host Bridge
parents 9b2707ca d3c68e0a

Documentation/devicetree/bindings/pci/faraday,ftpci100.txt

0 → 100644
+129 −0
Original line number Diff line number Diff line 
Faraday Technology FTPCI100 PCI Host Bridge



This PCI bridge is found inside that Cortina Systems Gemini SoC platform and

is a generic IP block from Faraday Technology. It exists in two variants:

plain and dual PCI. The plain version embeds a cascading interrupt controller

into the host bridge. The dual version routes the interrupts to the host

chips interrupt controller.



The host controller appear on the PCI bus with vendor ID 0x159b (Faraday

Technology) and product ID 0x4321.



Mandatory properties:



- compatible: ranging from specific to generic, should be one of

  "cortina,gemini-pci", "faraday,ftpci100"

  "cortina,gemini-pci-dual", "faraday,ftpci100-dual"

  "faraday,ftpci100"

  "faraday,ftpci100-dual"

- reg: memory base and size for the host bridge

- #address-cells: set to <3>

- #size-cells: set to <2>

- #interrupt-cells: set to <1>

- bus-range: set to <0x00 0xff>

- device_type, set to "pci"

- ranges: see pci.txt

- interrupt-map-mask: see pci.txt

- interrupt-map: see pci.txt

- dma-ranges: three ranges for the inbound memory region. The ranges must

  be aligned to a 1MB boundary, and may be 1MB, 2MB, 4MB, 8MB, 16MB, 32MB, 64MB,

  128MB, 256MB, 512MB, 1GB or 2GB in size. The memory should be marked as

  pre-fetchable.



Mandatory subnodes:

- For "faraday,ftpci100" a node representing the interrupt-controller inside the

  host bridge is mandatory. It has the following mandatory properties:

  - interrupt: see interrupt-controller/interrupts.txt

  - interrupt-parent: see interrupt-controller/interrupts.txt

  - interrupt-controller: see interrupt-controller/interrupts.txt

  - #address-cells: set to <0>

  - #interrupt-cells: set to <1>



I/O space considerations:



The plain variant has 128MiB of non-prefetchable memory space, whereas the

"dual" variant has 64MiB. Take this into account when describing the ranges.



Interrupt map considerations:



The "dual" variant will get INT A, B, C, D from the system interrupt controller

and should point to respective interrupt in that controller in its

interrupt-map.



The code which is the only documentation of how the Faraday PCI (the non-dual

variant) interrupts assigns the default interrupt mapping/swizzling has

typically been like this, doing the swizzling on the interrupt controller side

rather than in the interconnect:



interrupt-map-mask = <0xf800 0 0 7>;

interrupt-map =

	<0x4800 0 0 1 &pci_intc 0>, /* Slot 9 */

	<0x4800 0 0 2 &pci_intc 1>,

	<0x4800 0 0 3 &pci_intc 2>,

	<0x4800 0 0 4 &pci_intc 3>,

	<0x5000 0 0 1 &pci_intc 1>, /* Slot 10 */

	<0x5000 0 0 2 &pci_intc 2>,

	<0x5000 0 0 3 &pci_intc 3>,

	<0x5000 0 0 4 &pci_intc 0>,

	<0x5800 0 0 1 &pci_intc 2>, /* Slot 11 */

	<0x5800 0 0 2 &pci_intc 3>,

	<0x5800 0 0 3 &pci_intc 0>,

	<0x5800 0 0 4 &pci_intc 1>,

	<0x6000 0 0 1 &pci_intc 3>, /* Slot 12 */

	<0x6000 0 0 2 &pci_intc 0>,

	<0x6000 0 0 3 &pci_intc 1>,

	<0x6000 0 0 4 &pci_intc 2>;



Example:



pci@50000000 {

	compatible = "cortina,gemini-pci", "faraday,ftpci100";

	reg = <0x50000000 0x100>;

	interrupts = <8 IRQ_TYPE_LEVEL_HIGH>, /* PCI A */

			<26 IRQ_TYPE_LEVEL_HIGH>, /* PCI B */

			<27 IRQ_TYPE_LEVEL_HIGH>, /* PCI C */

			<28 IRQ_TYPE_LEVEL_HIGH>; /* PCI D */

	#address-cells = <3>;

	#size-cells = <2>;

	#interrupt-cells = <1>;



	bus-range = <0x00 0xff>;

	ranges = /* 1MiB I/O space 0x50000000-0x500fffff */

		 <0x01000000 0 0          0x50000000 0 0x00100000>,

		 /* 128MiB non-prefetchable memory 0x58000000-0x5fffffff */

		 <0x02000000 0 0x58000000 0x58000000 0 0x08000000>;



	/* DMA ranges */

	dma-ranges =

	/* 128MiB at 0x00000000-0x07ffffff */

	<0x02000000 0 0x00000000 0x00000000 0 0x08000000>,

	/* 64MiB at 0x00000000-0x03ffffff */

	<0x02000000 0 0x00000000 0x00000000 0 0x04000000>,

	/* 64MiB at 0x00000000-0x03ffffff */

	<0x02000000 0 0x00000000 0x00000000 0 0x04000000>;



	interrupt-map-mask = <0xf800 0 0 7>;

	interrupt-map =

		<0x4800 0 0 1 &pci_intc 0>, /* Slot 9 */

		<0x4800 0 0 2 &pci_intc 1>,

		<0x4800 0 0 3 &pci_intc 2>,

		<0x4800 0 0 4 &pci_intc 3>,

		<0x5000 0 0 1 &pci_intc 1>, /* Slot 10 */

		<0x5000 0 0 2 &pci_intc 2>,

		<0x5000 0 0 3 &pci_intc 3>,

		<0x5000 0 0 4 &pci_intc 0>,

		<0x5800 0 0 1 &pci_intc 2>, /* Slot 11 */

		<0x5800 0 0 2 &pci_intc 3>,

		<0x5800 0 0 3 &pci_intc 0>,

		<0x5800 0 0 4 &pci_intc 1>,

		<0x6000 0 0 1 &pci_intc 3>, /* Slot 12 */

		<0x6000 0 0 2 &pci_intc 0>,

		<0x6000 0 0 3 &pci_intc 0>,

		<0x6000 0 0 4 &pci_intc 0>;

	pci_intc: interrupt-controller {

		interrupt-parent = <&intcon>;

		interrupt-controller;

		#address-cells = <0>;

		#interrupt-cells = <1>;

	};

};

drivers/pci/host/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -27,6 +27,12 @@ config PCIE_XILINX_NWL 
	 or End Point. The current option selection will only

	 support root port enabling.



config PCI_FTPCI100

	bool "Faraday Technology FTPCI100 PCI controller"

	depends on OF

	depends on ARM

	default ARCH_GEMINI



config PCI_TEGRA

	bool "NVIDIA Tegra PCIe controller"

	depends on ARCH_TEGRA

drivers/pci/host/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_PCI_FTPCI100) += pci-ftpci100.o

obj-$(CONFIG_PCI_HYPERV) += pci-hyperv.o

obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o

obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o

drivers/pci/host/pci-ftpci100.c

0 → 100644
+562 −0
Original line number Diff line number Diff line 
/*

 * Support for Faraday Technology FTPC100 PCI Controller

 *

 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>

 *

 * Based on the out-of-tree OpenWRT patch for Cortina Gemini:

 * Copyright (C) 2009 Janos Laube <janos.dev@gmail.com>

 * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>

 * Based on SL2312 PCI controller code

 * Storlink (C) 2003

 */



#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/of_address.h>

#include <linux/of_device.h>

#include <linux/of_irq.h>

#include <linux/of_pci.h>

#include <linux/pci.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/irqdomain.h>

#include <linux/irqchip/chained_irq.h>

#include <linux/bitops.h>

#include <linux/irq.h>



/*

 * Special configuration registers directly in the first few words

 * in I/O space.

 */

#define PCI_IOSIZE	0x00

#define PCI_PROT	0x04 /* AHB protection */

#define PCI_CTRL	0x08 /* PCI control signal */

#define PCI_SOFTRST	0x10 /* Soft reset counter and response error enable */

#define PCI_CONFIG	0x28 /* PCI configuration command register */

#define PCI_DATA	0x2C



#define FARADAY_PCI_PMC			0x40 /* Power management control */

#define FARADAY_PCI_PMCSR		0x44 /* Power management status */

#define FARADAY_PCI_CTRL1		0x48 /* Control register 1 */

#define FARADAY_PCI_CTRL2		0x4C /* Control register 2 */

#define FARADAY_PCI_MEM1_BASE_SIZE	0x50 /* Memory base and size #1 */

#define FARADAY_PCI_MEM2_BASE_SIZE	0x54 /* Memory base and size #2 */

#define FARADAY_PCI_MEM3_BASE_SIZE	0x58 /* Memory base and size #3 */



/* Bits 31..28 gives INTD..INTA status */

#define PCI_CTRL2_INTSTS_SHIFT		28

#define PCI_CTRL2_INTMASK_CMDERR	BIT(27)

#define PCI_CTRL2_INTMASK_PARERR	BIT(26)

/* Bits 25..22 masks INTD..INTA */

#define PCI_CTRL2_INTMASK_SHIFT		22

#define PCI_CTRL2_INTMASK_MABRT_RX	BIT(21)

#define PCI_CTRL2_INTMASK_TABRT_RX	BIT(20)

#define PCI_CTRL2_INTMASK_TABRT_TX	BIT(19)

#define PCI_CTRL2_INTMASK_RETRY4	BIT(18)

#define PCI_CTRL2_INTMASK_SERR_RX	BIT(17)

#define PCI_CTRL2_INTMASK_PERR_RX	BIT(16)

/* Bit 15 reserved */

#define PCI_CTRL2_MSTPRI_REQ6		BIT(14)

#define PCI_CTRL2_MSTPRI_REQ5		BIT(13)

#define PCI_CTRL2_MSTPRI_REQ4		BIT(12)

#define PCI_CTRL2_MSTPRI_REQ3		BIT(11)

#define PCI_CTRL2_MSTPRI_REQ2		BIT(10)

#define PCI_CTRL2_MSTPRI_REQ1		BIT(9)

#define PCI_CTRL2_MSTPRI_REQ0		BIT(8)

/* Bits 7..4 reserved */

/* Bits 3..0 TRDYW */



/*

 * Memory configs:

 * Bit 31..20 defines the PCI side memory base

 * Bit 19..16 (4 bits) defines the size per below

 */

#define FARADAY_PCI_MEMBASE_MASK	0xfff00000

#define FARADAY_PCI_MEMSIZE_1MB		0x0

#define FARADAY_PCI_MEMSIZE_2MB		0x1

#define FARADAY_PCI_MEMSIZE_4MB		0x2

#define FARADAY_PCI_MEMSIZE_8MB		0x3

#define FARADAY_PCI_MEMSIZE_16MB	0x4

#define FARADAY_PCI_MEMSIZE_32MB	0x5

#define FARADAY_PCI_MEMSIZE_64MB	0x6

#define FARADAY_PCI_MEMSIZE_128MB	0x7

#define FARADAY_PCI_MEMSIZE_256MB	0x8

#define FARADAY_PCI_MEMSIZE_512MB	0x9

#define FARADAY_PCI_MEMSIZE_1GB		0xa

#define FARADAY_PCI_MEMSIZE_2GB		0xb

#define FARADAY_PCI_MEMSIZE_SHIFT	16



/*

 * The DMA base is set to 0x0 for all memory segments, it reflects the

 * fact that the memory of the host system starts at 0x0.

 */

#define FARADAY_PCI_DMA_MEM1_BASE	0x00000000

#define FARADAY_PCI_DMA_MEM2_BASE	0x00000000

#define FARADAY_PCI_DMA_MEM3_BASE	0x00000000



/* Defines for PCI configuration command register */

#define PCI_CONF_ENABLE		BIT(31)

#define PCI_CONF_WHERE(r)	((r) & 0xFC)

#define PCI_CONF_BUS(b)		(((b) & 0xFF) << 16)

#define PCI_CONF_DEVICE(d)	(((d) & 0x1F) << 11)

#define PCI_CONF_FUNCTION(f)	(((f) & 0x07) << 8)



/**

 * struct faraday_pci_variant - encodes IP block differences

 * @cascaded_irq: this host has cascaded IRQs from an interrupt controller

 *	embedded in the host bridge.

 */

struct faraday_pci_variant {

	bool cascaded_irq;

};



struct faraday_pci {

	struct device *dev;

	void __iomem *base;

	struct irq_domain *irqdomain;

	struct pci_bus *bus;

};



static int faraday_res_to_memcfg(resource_size_t mem_base,

				 resource_size_t mem_size, u32 *val)

{

	u32 outval;



	switch (mem_size) {

	case SZ_1M:

		outval = FARADAY_PCI_MEMSIZE_1MB;

		break;

	case SZ_2M:

		outval = FARADAY_PCI_MEMSIZE_2MB;

		break;

	case SZ_4M:

		outval = FARADAY_PCI_MEMSIZE_4MB;

		break;

	case SZ_8M:

		outval = FARADAY_PCI_MEMSIZE_8MB;

		break;

	case SZ_16M:

		outval = FARADAY_PCI_MEMSIZE_16MB;

		break;

	case SZ_32M:

		outval = FARADAY_PCI_MEMSIZE_32MB;

		break;

	case SZ_64M:

		outval = FARADAY_PCI_MEMSIZE_64MB;

		break;

	case SZ_128M:

		outval = FARADAY_PCI_MEMSIZE_128MB;

		break;

	case SZ_256M:

		outval = FARADAY_PCI_MEMSIZE_256MB;

		break;

	case SZ_512M:

		outval = FARADAY_PCI_MEMSIZE_512MB;

		break;

	case SZ_1G:

		outval = FARADAY_PCI_MEMSIZE_1GB;

		break;

	case SZ_2G:

		outval = FARADAY_PCI_MEMSIZE_2GB;

		break;

	default:

		return -EINVAL;

	}

	outval <<= FARADAY_PCI_MEMSIZE_SHIFT;



	/* This is probably not good */

	if (mem_base & ~(FARADAY_PCI_MEMBASE_MASK))

		pr_warn("truncated PCI memory base\n");

	/* Translate to bridge side address space */

	outval |= (mem_base & FARADAY_PCI_MEMBASE_MASK);

	pr_debug("Translated pci base @%pap, size %pap to config %08x\n",

		 &mem_base, &mem_size, outval);



	*val = outval;

	return 0;

}



static int faraday_pci_read_config(struct pci_bus *bus, unsigned int fn,

				   int config, int size, u32 *value)

{

	struct faraday_pci *p = bus->sysdata;



	writel(PCI_CONF_BUS(bus->number) |

			PCI_CONF_DEVICE(PCI_SLOT(fn)) |

			PCI_CONF_FUNCTION(PCI_FUNC(fn)) |

			PCI_CONF_WHERE(config) |

			PCI_CONF_ENABLE,

			p->base + PCI_CONFIG);



	*value = readl(p->base + PCI_DATA);



	if (size == 1)

		*value = (*value >> (8 * (config & 3))) & 0xFF;

	else if (size == 2)

		*value = (*value >> (8 * (config & 3))) & 0xFFFF;



	dev_dbg(&bus->dev,

		"[read]  slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",

		PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value);



	return PCIBIOS_SUCCESSFUL;

}



static int faraday_pci_write_config(struct pci_bus *bus, unsigned int fn,

				    int config, int size, u32 value)

{

	struct faraday_pci *p = bus->sysdata;

	int ret = PCIBIOS_SUCCESSFUL;



	dev_dbg(&bus->dev,

		"[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",

		PCI_SLOT(fn), PCI_FUNC(fn), config, size, value);



	writel(PCI_CONF_BUS(bus->number) |

			PCI_CONF_DEVICE(PCI_SLOT(fn)) |

			PCI_CONF_FUNCTION(PCI_FUNC(fn)) |

			PCI_CONF_WHERE(config) |

			PCI_CONF_ENABLE,

			p->base + PCI_CONFIG);



	switch (size) {

	case 4:

		writel(value, p->base + PCI_DATA);

		break;

	case 2:

		writew(value, p->base + PCI_DATA + (config & 3));

		break;

	case 1:

		writeb(value, p->base + PCI_DATA + (config & 3));

		break;

	default:

		ret = PCIBIOS_BAD_REGISTER_NUMBER;

	}



	return ret;

}



static struct pci_ops faraday_pci_ops = {

	.read	= faraday_pci_read_config,

	.write	= faraday_pci_write_config,

};



static void faraday_pci_ack_irq(struct irq_data *d)

{

	struct faraday_pci *p = irq_data_get_irq_chip_data(d);

	unsigned int reg;



	faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, &reg);

	reg &= ~(0xF << PCI_CTRL2_INTSTS_SHIFT);

	reg |= BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTSTS_SHIFT);

	faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, reg);

}



static void faraday_pci_mask_irq(struct irq_data *d)

{

	struct faraday_pci *p = irq_data_get_irq_chip_data(d);

	unsigned int reg;



	faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, &reg);

	reg &= ~((0xF << PCI_CTRL2_INTSTS_SHIFT)

		 | BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTMASK_SHIFT));

	faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, reg);

}



static void faraday_pci_unmask_irq(struct irq_data *d)

{

	struct faraday_pci *p = irq_data_get_irq_chip_data(d);

	unsigned int reg;



	faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, &reg);

	reg &= ~(0xF << PCI_CTRL2_INTSTS_SHIFT);

	reg |= BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTMASK_SHIFT);

	faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, reg);

}



static void faraday_pci_irq_handler(struct irq_desc *desc)

{

	struct faraday_pci *p = irq_desc_get_handler_data(desc);

	struct irq_chip *irqchip = irq_desc_get_chip(desc);

	unsigned int irq_stat, reg, i;



	faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, &reg);

	irq_stat = reg >> PCI_CTRL2_INTSTS_SHIFT;



	chained_irq_enter(irqchip, desc);



	for (i = 0; i < 4; i++) {

		if ((irq_stat & BIT(i)) == 0)

			continue;

		generic_handle_irq(irq_find_mapping(p->irqdomain, i));

	}



	chained_irq_exit(irqchip, desc);

}



static struct irq_chip faraday_pci_irq_chip = {

	.name = "PCI",

	.irq_ack = faraday_pci_ack_irq,

	.irq_mask = faraday_pci_mask_irq,

	.irq_unmask = faraday_pci_unmask_irq,

};



static int faraday_pci_irq_map(struct irq_domain *domain, unsigned int irq,

			       irq_hw_number_t hwirq)

{

	irq_set_chip_and_handler(irq, &faraday_pci_irq_chip, handle_level_irq);

	irq_set_chip_data(irq, domain->host_data);



	return 0;

}



static const struct irq_domain_ops faraday_pci_irqdomain_ops = {

	.map = faraday_pci_irq_map,

};



static int faraday_pci_setup_cascaded_irq(struct faraday_pci *p)

{

	struct device_node *intc = of_get_next_child(p->dev->of_node, NULL);

	int irq;

	int i;



	if (!intc) {

		dev_err(p->dev, "missing child interrupt-controller node\n");

		return -EINVAL;

	}



	/* All PCI IRQs cascade off this one */

	irq = of_irq_get(intc, 0);

	if (!irq) {

		dev_err(p->dev, "failed to get parent IRQ\n");

		return -EINVAL;

	}



	p->irqdomain = irq_domain_add_linear(intc, 4,

					     &faraday_pci_irqdomain_ops, p);

	if (!p->irqdomain) {

		dev_err(p->dev, "failed to create Gemini PCI IRQ domain\n");

		return -EINVAL;

	}



	irq_set_chained_handler_and_data(irq, faraday_pci_irq_handler, p);



	for (i = 0; i < 4; i++)

		irq_create_mapping(p->irqdomain, i);



	return 0;

}



static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,

				     struct device_node *node)

{

	const int na = 3, ns = 2;

	int rlen;



	parser->node = node;

	parser->pna = of_n_addr_cells(node);

	parser->np = parser->pna + na + ns;



	parser->range = of_get_property(node, "dma-ranges", &rlen);

	if (!parser->range)

		return -ENOENT;

	parser->end = parser->range + rlen / sizeof(__be32);



	return 0;

}



static int faraday_pci_parse_map_dma_ranges(struct faraday_pci *p,

					    struct device_node *np)

{

	struct of_pci_range range;

	struct of_pci_range_parser parser;

	struct device *dev = p->dev;

	u32 confreg[3] = {

		FARADAY_PCI_MEM1_BASE_SIZE,

		FARADAY_PCI_MEM2_BASE_SIZE,

		FARADAY_PCI_MEM3_BASE_SIZE,

	};

	int i = 0;

	u32 val;



	if (pci_dma_range_parser_init(&parser, np)) {

		dev_err(dev, "missing dma-ranges property\n");

		return -EINVAL;

	}



	/*

	 * Get the dma-ranges from the device tree

	 */

	for_each_of_pci_range(&parser, &range) {

		u64 end = range.pci_addr + range.size - 1;

		int ret;



		ret = faraday_res_to_memcfg(range.pci_addr, range.size, &val);

		if (ret) {

			dev_err(dev,

				"DMA range %d: illegal MEM resource size\n", i);

			return -EINVAL;

		}



		dev_info(dev, "DMA MEM%d BASE: 0x%016llx -> 0x%016llx config %08x\n",

			 i + 1, range.pci_addr, end, val);

		if (i <= 2) {

			faraday_pci_write_config(p->bus, 0, confreg[i],

						 4, val);

		} else {

			dev_err(dev, "ignore extraneous dma-range %d\n", i);

			break;

		}



		i++;

	}



	return 0;

}



static int faraday_pci_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	const struct faraday_pci_variant *variant =

		of_device_get_match_data(dev);

	struct resource *regs;

	resource_size_t io_base;

	struct resource_entry *win;

	struct faraday_pci *p;

	struct resource *mem;

	struct resource *io;

	struct pci_host_bridge *host;

	int ret;

	u32 val;

	LIST_HEAD(res);



	host = pci_alloc_host_bridge(sizeof(*p));

	if (!host)

		return -ENOMEM;



	host->dev.parent = dev;

	host->ops = &faraday_pci_ops;

	host->busnr = 0;

	host->msi = NULL;

	p = pci_host_bridge_priv(host);

	host->sysdata = p;

	p->dev = dev;



	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	p->base = devm_ioremap_resource(dev, regs);

	if (IS_ERR(p->base))

		return PTR_ERR(p->base);



	ret = of_pci_get_host_bridge_resources(dev->of_node, 0, 0xff,

					       &res, &io_base);

	if (ret)

		return ret;



	ret = devm_request_pci_bus_resources(dev, &res);

	if (ret)

		return ret;



	/* Get the I/O and memory ranges from DT */

	resource_list_for_each_entry(win, &res) {

		switch (resource_type(win->res)) {

		case IORESOURCE_IO:

			io = win->res;

			io->name = "Gemini PCI I/O";

			if (!faraday_res_to_memcfg(io->start - win->offset,

						   resource_size(io), &val)) {

				/* setup I/O space size */

				writel(val, p->base + PCI_IOSIZE);

			} else {

				dev_err(dev, "illegal IO mem size\n");

				return -EINVAL;

			}

			ret = pci_remap_iospace(io, io_base);

			if (ret) {

				dev_warn(dev, "error %d: failed to map resource %pR\n",

					 ret, io);

				continue;

			}

			break;

		case IORESOURCE_MEM:

			mem = win->res;

			mem->name = "Gemini PCI MEM";

			break;

		case IORESOURCE_BUS:

			break;

		default:

			break;

		}

	}



	/* Setup hostbridge */

	val = readl(p->base + PCI_CTRL);

	val |= PCI_COMMAND_IO;

	val |= PCI_COMMAND_MEMORY;

	val |= PCI_COMMAND_MASTER;

	writel(val, p->base + PCI_CTRL);



	list_splice_init(&res, &host->windows);

	ret = pci_register_host_bridge(host);

	if (ret) {

		dev_err(dev, "failed to register host: %d\n", ret);

		return ret;

	}

	p->bus = host->bus;



	/* Mask and clear all interrupts */

	faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2 + 2, 2, 0xF000);

	if (variant->cascaded_irq) {

		ret = faraday_pci_setup_cascaded_irq(p);

		if (ret) {

			dev_err(dev, "failed to setup cascaded IRQ\n");

			return ret;

		}

	}



	ret = faraday_pci_parse_map_dma_ranges(p, dev->of_node);

	if (ret)

		return ret;



	pci_scan_child_bus(p->bus);

	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);

	pci_bus_assign_resources(p->bus);

	pci_bus_add_devices(p->bus);

	pci_free_resource_list(&res);



	return 0;

}



/*

 * We encode bridge variants here, we have at least two so it doesn't

 * hurt to have infrastructure to encompass future variants as well.

 */

const struct faraday_pci_variant faraday_regular = {

	.cascaded_irq = true,

};



const struct faraday_pci_variant faraday_dual = {

	.cascaded_irq = false,

};



static const struct of_device_id faraday_pci_of_match[] = {

	{

		.compatible = "faraday,ftpci100",

		.data = &faraday_regular,

	},

	{

		.compatible = "faraday,ftpci100-dual",

		.data = &faraday_dual,

	},

	{},

};



static struct platform_driver faraday_pci_driver = {

	.driver = {

		.name = "ftpci100",

		.of_match_table = of_match_ptr(faraday_pci_of_match),

	},

	.probe  = faraday_pci_probe,

};

builtin_platform_driver(faraday_pci_driver);