arch/mips/pci/pci-mt7620.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  *  Ralink MT7620A SoC PCI support
  *
  *  Copyright (C) 2007-2013 Bruce Chang (Mediatek)
  *  Copyright (C) 2013-2016 John Crispin <john@phrozen.org>
  *
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms of the GNU General Public License version 2 as published
  *  by the Free Software Foundation.
  */

 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/io.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_pci.h>
 #include <linux/reset.h>
 #include <linux/platform_device.h>

 #include <asm/mach-ralink/ralink_regs.h>
 #include <asm/mach-ralink/mt7620.h>

 #define RALINK_PCI_IO_MAP_BASE		0x10160000
 #define RALINK_PCI_MEMORY_BASE		0x0

 #define RALINK_INT_PCIE0		4

 #define RALINK_CLKCFG1			0x30
 #define RALINK_GPIOMODE			0x60

 #define PPLL_CFG1			0x9c
 #define PDRV_SW_SET			BIT(23)

 #define PPLL_DRV			0xa0
 #define PDRV_SW_SET			(1<<31)
 #define LC_CKDRVPD			(1<<19)
 #define LC_CKDRVOHZ			(1<<18)
 #define LC_CKDRVHZ			(1<<17)
 #define LC_CKTEST			(1<<16)

 /* PCI Bridge registers */
 #define RALINK_PCI_PCICFG_ADDR		0x00
 #define PCIRST				BIT(1)

 #define RALINK_PCI_PCIENA		0x0C
 #define PCIINT2				BIT(20)

 #define RALINK_PCI_CONFIG_ADDR		0x20
 #define RALINK_PCI_CONFIG_DATA_VIRT_REG	0x24
 #define RALINK_PCI_MEMBASE		0x28
 #define RALINK_PCI_IOBASE		0x2C

 /* PCI RC registers */
 #define RALINK_PCI0_BAR0SETUP_ADDR	0x10
 #define RALINK_PCI0_IMBASEBAR0_ADDR	0x18
 #define RALINK_PCI0_ID			0x30
 #define RALINK_PCI0_CLASS		0x34
 #define RALINK_PCI0_SUBID		0x38
 #define RALINK_PCI0_STATUS		0x50
 #define PCIE_LINK_UP_ST			BIT(0)

 #define PCIEPHY0_CFG			0x90

 #define RALINK_PCIEPHY_P0_CTL_OFFSET	0x7498
 #define RALINK_PCIE0_CLK_EN		(1 << 26)

 #define BUSY				0x80000000
 #define WAITRETRY_MAX			10
 #define WRITE_MODE			(1UL << 23)
 #define DATA_SHIFT			0
 #define ADDR_SHIFT			8


 static void __iomem *bridge_base;
 static void __iomem *pcie_base;

 static struct reset_control *rstpcie0;

 static inline void bridge_w32(u32 val, unsigned reg)
 {
 	iowrite32(val, bridge_base + reg);
 }

 static inline u32 bridge_r32(unsigned reg)
 {
 	return ioread32(bridge_base + reg);
 }

 static inline void pcie_w32(u32 val, unsigned reg)
 {
 	iowrite32(val, pcie_base + reg);
 }

 static inline u32 pcie_r32(unsigned reg)
 {
 	return ioread32(pcie_base + reg);
 }

 static inline void pcie_m32(u32 clr, u32 set, unsigned reg)
 {
 	u32 val = pcie_r32(reg);

 	val &= ~clr;
 	val |= set;
 	pcie_w32(val, reg);
 }

 static int wait_pciephy_busy(void)
 {
 	unsigned long reg_value = 0x0, retry = 0;

 	while (1) {
 		reg_value = pcie_r32(PCIEPHY0_CFG);

 		if (reg_value & BUSY)
 			mdelay(100);
 		else
 			break;
 		if (retry++ > WAITRETRY_MAX) {
 			pr_warn("PCIE-PHY retry failed.\n");
 			return -1;
 		}
 	}
 	return 0;
 }

 static void pcie_phy(unsigned long addr, unsigned long val)
 {
 	wait_pciephy_busy();
 	pcie_w32(WRITE_MODE | (val << DATA_SHIFT) | (addr << ADDR_SHIFT),
 		 PCIEPHY0_CFG);
 	mdelay(1);
 	wait_pciephy_busy();
 }

 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
 			   int size, u32 *val)
 {
 	unsigned int slot = PCI_SLOT(devfn);
 	u8 func = PCI_FUNC(devfn);
 	u32 address;
 	u32 data;
 	u32 num = 0;

 	if (bus)
 		num = bus->number;

 	address = (((where & 0xF00) >> 8) << 24) | (num << 16) | (slot << 11) |
 		  (func << 8) | (where & 0xfc) | 0x80000000;
 	bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
 	data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG);

 	switch (size) {
 	case 1:
 		*val = (data >> ((where & 3) << 3)) & 0xff;
 		break;
 	case 2:
 		*val = (data >> ((where & 3) << 3)) & 0xffff;
 		break;
 	case 4:
 		*val = data;
 		break;
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
 			    int size, u32 val)
 {
 	unsigned int slot = PCI_SLOT(devfn);
 	u8 func = PCI_FUNC(devfn);
 	u32 address;
 	u32 data;
 	u32 num = 0;

 	if (bus)
 		num = bus->number;

 	address = (((where & 0xF00) >> 8) << 24) | (num << 16) | (slot << 11) |
 		  (func << 8) | (where & 0xfc) | 0x80000000;
 	bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
 	data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG);

 	switch (size) {
 	case 1:
 		data = (data & ~(0xff << ((where & 3) << 3))) |
 			(val << ((where & 3) << 3));
 		break;
 	case 2:
 		data = (data & ~(0xffff << ((where & 3) << 3))) |
 			(val << ((where & 3) << 3));
 		break;
 	case 4:
 		data = val;
 		break;
 	}

 	bridge_w32(data, RALINK_PCI_CONFIG_DATA_VIRT_REG);

 	return PCIBIOS_SUCCESSFUL;
 }

 struct pci_ops mt7620_pci_ops = {
 	.read	= pci_config_read,
 	.write	= pci_config_write,
 };

 static struct resource mt7620_res_pci_mem1;
 static struct resource mt7620_res_pci_io1;
 struct pci_controller mt7620_controller = {
 	.pci_ops	= &mt7620_pci_ops,
 	.mem_resource	= &mt7620_res_pci_mem1,
 	.mem_offset	= 0x00000000UL,
 	.io_resource	= &mt7620_res_pci_io1,
 	.io_offset	= 0x00000000UL,
 	.io_map_base	= 0xa0000000,
 };

 static int mt7620_pci_hw_init(struct platform_device *pdev)
 {
 	/* bypass PCIe DLL */
 	pcie_phy(0x0, 0x80);
 	pcie_phy(0x1, 0x04);

 	/* Elastic buffer control */
 	pcie_phy(0x68, 0xB4);

 	/* put core into reset */
 	pcie_m32(0, PCIRST, RALINK_PCI_PCICFG_ADDR);
 	reset_control_assert(rstpcie0);

 	/* disable power and all clocks */
 	rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
 	rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV);

 	/* bring core out of reset */
 	reset_control_deassert(rstpcie0);
 	rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
 	mdelay(100);

 	if (!(rt_sysc_r32(PPLL_CFG1) & PDRV_SW_SET)) {
 		dev_err(&pdev->dev, "MT7620 PPLL unlock\n");
 		reset_control_assert(rstpcie0);
 		rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
 		return -1;
 	}

 	/* power up the bus */
 	rt_sysc_m32(LC_CKDRVHZ | LC_CKDRVOHZ, LC_CKDRVPD | PDRV_SW_SET,
 		    PPLL_DRV);

 	return 0;
 }

 static int mt7628_pci_hw_init(struct platform_device *pdev)
 {
 	u32 val = 0;

 	/* bring the core out of reset */
 	rt_sysc_m32(BIT(16), 0, RALINK_GPIOMODE);
 	reset_control_deassert(rstpcie0);

 	/* enable the pci clk */
 	rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
 	mdelay(100);

 	/* voodoo from the SDK driver */
 	pcie_m32(~0xff, 0x5, RALINK_PCIEPHY_P0_CTL_OFFSET);

 	pci_config_read(NULL, 0, 0x70c, 4, &val);
 	val &= ~(0xff) << 8;
 	val |= 0x50 << 8;
 	pci_config_write(NULL, 0, 0x70c, 4, val);

 	pci_config_read(NULL, 0, 0x70c, 4, &val);
 	dev_err(&pdev->dev, "Port 0 N_FTS = %x\n", (unsigned int) val);

 	return 0;
 }

 static int mt7620_pci_probe(struct platform_device *pdev)
 {
 	struct resource *bridge_res = platform_get_resource(pdev,
 							    IORESOURCE_MEM, 0);
 	struct resource *pcie_res = platform_get_resource(pdev,
 							  IORESOURCE_MEM, 1);
 	u32 val = 0;

 	rstpcie0 = devm_reset_control_get_exclusive(&pdev->dev, "pcie0");
 	if (IS_ERR(rstpcie0))
 		return PTR_ERR(rstpcie0);

 	bridge_base = devm_ioremap_resource(&pdev->dev, bridge_res);
 	if (IS_ERR(bridge_base))
 		return PTR_ERR(bridge_base);

 	pcie_base = devm_ioremap_resource(&pdev->dev, pcie_res);
 	if (IS_ERR(pcie_base))
 		return PTR_ERR(pcie_base);

 	iomem_resource.start = 0;
 	iomem_resource.end = ~0;
 	ioport_resource.start = 0;
 	ioport_resource.end = ~0;

 	/* bring up the pci core */
 	switch (ralink_soc) {
 	case MT762X_SOC_MT7620A:
 		if (mt7620_pci_hw_init(pdev))
 			return -1;
 		break;

 	case MT762X_SOC_MT7628AN:
 		if (mt7628_pci_hw_init(pdev))
 			return -1;
 		break;

 	default:
 		dev_err(&pdev->dev, "pcie is not supported on this hardware\n");
 		return -1;
 	}
 	mdelay(50);

 	/* enable write access */
 	pcie_m32(PCIRST, 0, RALINK_PCI_PCICFG_ADDR);
 	mdelay(100);

 	/* check if there is a card present */
 	if ((pcie_r32(RALINK_PCI0_STATUS) & PCIE_LINK_UP_ST) == 0) {
 		reset_control_assert(rstpcie0);
 		rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
 		if (ralink_soc == MT762X_SOC_MT7620A)
 			rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV);
 		dev_err(&pdev->dev, "PCIE0 no card, disable it(RST&CLK)\n");
 		return -1;
 	}

 	/* setup ranges */
 	bridge_w32(0xffffffff, RALINK_PCI_MEMBASE);
 	bridge_w32(RALINK_PCI_IO_MAP_BASE, RALINK_PCI_IOBASE);

 	pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR);
 	pcie_w32(RALINK_PCI_MEMORY_BASE, RALINK_PCI0_IMBASEBAR0_ADDR);
 	pcie_w32(0x06040001, RALINK_PCI0_CLASS);

 	/* enable interrupts */
 	pcie_m32(0, PCIINT2, RALINK_PCI_PCIENA);

 	/* voodoo from the SDK driver */
 	pci_config_read(NULL, 0, 4, 4, &val);
 	pci_config_write(NULL, 0, 4, 4, val | 0x7);

 	pci_load_of_ranges(&mt7620_controller, pdev->dev.of_node);
 	register_pci_controller(&mt7620_controller);

 	return 0;
 }

 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	u16 cmd;
 	u32 val;
 	int irq = 0;

 	if ((dev->bus->number == 0) && (slot == 0)) {
 		pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR);
 		pci_config_write(dev->bus, 0, PCI_BASE_ADDRESS_0, 4,
 				 RALINK_PCI_MEMORY_BASE);
 		pci_config_read(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, &val);
 	} else if ((dev->bus->number == 1) && (slot == 0x0)) {
 		irq = RALINK_INT_PCIE0;
 	} else {
 		dev_err(&dev->dev, "no irq found - bus=0x%x, slot = 0x%x\n",
 			dev->bus->number, slot);
 		return 0;
 	}
 	dev_err(&dev->dev, "card - bus=0x%x, slot = 0x%x irq=%d\n",
 		dev->bus->number, slot, irq);

 	/* configure the cache line size to 0x14 */
 	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x14);

 	/* configure latency timer to 0xff */
 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xff);
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);

 	/* setup the slot */
 	cmd = cmd | PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 	pci_write_config_word(dev, PCI_COMMAND, cmd);
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);

 	return irq;
 }

 int pcibios_plat_dev_init(struct pci_dev *dev)
 {
 	return 0;
 }

 static const struct of_device_id mt7620_pci_ids[] = {
 	{ .compatible = "mediatek,mt7620-pci" },
 	{},
 };

 static struct platform_driver mt7620_pci_driver = {
 	.probe = mt7620_pci_probe,
 	.driver = {
 		.name = "mt7620-pci",
 		.of_match_table = of_match_ptr(mt7620_pci_ids),
 	},
 };

 static int __init mt7620_pci_init(void)
 {
 	return platform_driver_register(&mt7620_pci_driver);
 }

 arch_initcall(mt7620_pci_init);
	/*
	* Ralink MT7620A SoC PCI support
	*
	* Copyright (C) 2007-2013 Bruce Chang (Mediatek)
	* Copyright (C) 2013-2016 John Crispin <john@phrozen.org>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation.
	*/

	#include <linux/types.h>
	#include <linux/pci.h>
	#include <linux/io.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/of.h>
	#include <linux/of_irq.h>
	#include <linux/of_pci.h>
	#include <linux/reset.h>
	#include <linux/platform_device.h>

	#include <asm/mach-ralink/ralink_regs.h>
	#include <asm/mach-ralink/mt7620.h>

	#define RALINK_PCI_IO_MAP_BASE 0x10160000
	#define RALINK_PCI_MEMORY_BASE 0x0

	#define RALINK_INT_PCIE0 4

	#define RALINK_CLKCFG1 0x30
	#define RALINK_GPIOMODE 0x60

	#define PPLL_CFG1 0x9c
	#define PDRV_SW_SET BIT(23)

	#define PPLL_DRV 0xa0
	#define PDRV_SW_SET (1<<31)
	#define LC_CKDRVPD (1<<19)
	#define LC_CKDRVOHZ (1<<18)
	#define LC_CKDRVHZ (1<<17)
	#define LC_CKTEST (1<<16)

	/* PCI Bridge registers */
	#define RALINK_PCI_PCICFG_ADDR 0x00
	#define PCIRST BIT(1)

	#define RALINK_PCI_PCIENA 0x0C
	#define PCIINT2 BIT(20)

	#define RALINK_PCI_CONFIG_ADDR 0x20
	#define RALINK_PCI_CONFIG_DATA_VIRT_REG 0x24
	#define RALINK_PCI_MEMBASE 0x28
	#define RALINK_PCI_IOBASE 0x2C

	/* PCI RC registers */
	#define RALINK_PCI0_BAR0SETUP_ADDR 0x10
	#define RALINK_PCI0_IMBASEBAR0_ADDR 0x18
	#define RALINK_PCI0_ID 0x30
	#define RALINK_PCI0_CLASS 0x34
	#define RALINK_PCI0_SUBID 0x38
	#define RALINK_PCI0_STATUS 0x50
	#define PCIE_LINK_UP_ST BIT(0)

	#define PCIEPHY0_CFG 0x90

	#define RALINK_PCIEPHY_P0_CTL_OFFSET 0x7498
	#define RALINK_PCIE0_CLK_EN (1 << 26)

	#define BUSY 0x80000000
	#define WAITRETRY_MAX 10
	#define WRITE_MODE (1UL << 23)
	#define DATA_SHIFT 0
	#define ADDR_SHIFT 8


	static void __iomem *bridge_base;
	static void __iomem *pcie_base;

	static struct reset_control *rstpcie0;

	static inline void bridge_w32(u32 val, unsigned reg)
	{
	iowrite32(val, bridge_base + reg);
	}

	static inline u32 bridge_r32(unsigned reg)
	{
	return ioread32(bridge_base + reg);
	}

	static inline void pcie_w32(u32 val, unsigned reg)
	{
	iowrite32(val, pcie_base + reg);
	}

	static inline u32 pcie_r32(unsigned reg)
	{
	return ioread32(pcie_base + reg);
	}

	static inline void pcie_m32(u32 clr, u32 set, unsigned reg)
	{
	u32 val = pcie_r32(reg);

	val &= ~clr;
	val \|= set;
	pcie_w32(val, reg);
	}

	static int wait_pciephy_busy(void)
	{
	unsigned long reg_value = 0x0, retry = 0;

	while (1) {
	reg_value = pcie_r32(PCIEPHY0_CFG);

	if (reg_value & BUSY)
	mdelay(100);
	else
	break;
	if (retry++ > WAITRETRY_MAX) {
	pr_warn("PCIE-PHY retry failed.\n");
	return -1;
	}
	}
	return 0;
	}

	static void pcie_phy(unsigned long addr, unsigned long val)
	{
	wait_pciephy_busy();
	pcie_w32(WRITE_MODE \| (val << DATA_SHIFT) \| (addr << ADDR_SHIFT),
	PCIEPHY0_CFG);
	mdelay(1);
	wait_pciephy_busy();
	}

	static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 *val)
	{
	unsigned int slot = PCI_SLOT(devfn);
	u8 func = PCI_FUNC(devfn);
	u32 address;
	u32 data;
	u32 num = 0;

	if (bus)
	num = bus->number;

	address = (((where & 0xF00) >> 8) << 24) \| (num << 16) \| (slot << 11) \|
	(func << 8) \| (where & 0xfc) \| 0x80000000;
	bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
	data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG);

	switch (size) {
	case 1:
	*val = (data >> ((where & 3) << 3)) & 0xff;
	break;
	case 2:
	*val = (data >> ((where & 3) << 3)) & 0xffff;
	break;
	case 4:
	*val = data;
	break;
	}

	return PCIBIOS_SUCCESSFUL;
	}

	static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 val)
	{
	unsigned int slot = PCI_SLOT(devfn);
	u8 func = PCI_FUNC(devfn);
	u32 address;
	u32 data;
	u32 num = 0;

	if (bus)
	num = bus->number;

	address = (((where & 0xF00) >> 8) << 24) \| (num << 16) \| (slot << 11) \|
	(func << 8) \| (where & 0xfc) \| 0x80000000;
	bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
	data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG);

	switch (size) {
	case 1:
	data = (data & ~(0xff << ((where & 3) << 3))) \|
	(val << ((where & 3) << 3));
	break;
	case 2:
	data = (data & ~(0xffff << ((where & 3) << 3))) \|
	(val << ((where & 3) << 3));
	break;
	case 4:
	data = val;
	break;
	}

	bridge_w32(data, RALINK_PCI_CONFIG_DATA_VIRT_REG);

	return PCIBIOS_SUCCESSFUL;
	}

	struct pci_ops mt7620_pci_ops = {
	.read = pci_config_read,
	.write = pci_config_write,
	};

	static struct resource mt7620_res_pci_mem1;
	static struct resource mt7620_res_pci_io1;
	struct pci_controller mt7620_controller = {
	.pci_ops = &mt7620_pci_ops,
	.mem_resource = &mt7620_res_pci_mem1,
	.mem_offset = 0x00000000UL,
	.io_resource = &mt7620_res_pci_io1,
	.io_offset = 0x00000000UL,
	.io_map_base = 0xa0000000,
	};

	static int mt7620_pci_hw_init(struct platform_device *pdev)
	{
	/* bypass PCIe DLL */
	pcie_phy(0x0, 0x80);
	pcie_phy(0x1, 0x04);

	/* Elastic buffer control */
	pcie_phy(0x68, 0xB4);

	/* put core into reset */
	pcie_m32(0, PCIRST, RALINK_PCI_PCICFG_ADDR);
	reset_control_assert(rstpcie0);

	/* disable power and all clocks */
	rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
	rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV);

	/* bring core out of reset */
	reset_control_deassert(rstpcie0);
	rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
	mdelay(100);

	if (!(rt_sysc_r32(PPLL_CFG1) & PDRV_SW_SET)) {
	dev_err(&pdev->dev, "MT7620 PPLL unlock\n");
	reset_control_assert(rstpcie0);
	rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
	return -1;
	}

	/* power up the bus */
	rt_sysc_m32(LC_CKDRVHZ \| LC_CKDRVOHZ, LC_CKDRVPD \| PDRV_SW_SET,
	PPLL_DRV);

	return 0;
	}

	static int mt7628_pci_hw_init(struct platform_device *pdev)
	{
	u32 val = 0;

	/* bring the core out of reset */
	rt_sysc_m32(BIT(16), 0, RALINK_GPIOMODE);
	reset_control_deassert(rstpcie0);

	/* enable the pci clk */
	rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
	mdelay(100);

	/* voodoo from the SDK driver */
	pcie_m32(~0xff, 0x5, RALINK_PCIEPHY_P0_CTL_OFFSET);

	pci_config_read(NULL, 0, 0x70c, 4, &val);
	val &= ~(0xff) << 8;
	val \|= 0x50 << 8;
	pci_config_write(NULL, 0, 0x70c, 4, val);

	pci_config_read(NULL, 0, 0x70c, 4, &val);
	dev_err(&pdev->dev, "Port 0 N_FTS = %x\n", (unsigned int) val);

	return 0;
	}

	static int mt7620_pci_probe(struct platform_device *pdev)
	{
	struct resource *bridge_res = platform_get_resource(pdev,
	IORESOURCE_MEM, 0);
	struct resource *pcie_res = platform_get_resource(pdev,
	IORESOURCE_MEM, 1);
	u32 val = 0;

	rstpcie0 = devm_reset_control_get_exclusive(&pdev->dev, "pcie0");
	if (IS_ERR(rstpcie0))
	return PTR_ERR(rstpcie0);

	bridge_base = devm_ioremap_resource(&pdev->dev, bridge_res);
	if (IS_ERR(bridge_base))
	return PTR_ERR(bridge_base);

	pcie_base = devm_ioremap_resource(&pdev->dev, pcie_res);
	if (IS_ERR(pcie_base))
	return PTR_ERR(pcie_base);

	iomem_resource.start = 0;
	iomem_resource.end = ~0;
	ioport_resource.start = 0;
	ioport_resource.end = ~0;

	/* bring up the pci core */
	switch (ralink_soc) {
	case MT762X_SOC_MT7620A:
	if (mt7620_pci_hw_init(pdev))
	return -1;
	break;

	case MT762X_SOC_MT7628AN:
	if (mt7628_pci_hw_init(pdev))
	return -1;
	break;

	default:
	dev_err(&pdev->dev, "pcie is not supported on this hardware\n");
	return -1;
	}
	mdelay(50);

	/* enable write access */
	pcie_m32(PCIRST, 0, RALINK_PCI_PCICFG_ADDR);
	mdelay(100);

	/* check if there is a card present */
	if ((pcie_r32(RALINK_PCI0_STATUS) & PCIE_LINK_UP_ST) == 0) {
	reset_control_assert(rstpcie0);
	rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
	if (ralink_soc == MT762X_SOC_MT7620A)
	rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV);
	dev_err(&pdev->dev, "PCIE0 no card, disable it(RST&CLK)\n");
	return -1;
	}

	/* setup ranges */
	bridge_w32(0xffffffff, RALINK_PCI_MEMBASE);
	bridge_w32(RALINK_PCI_IO_MAP_BASE, RALINK_PCI_IOBASE);

	pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR);
	pcie_w32(RALINK_PCI_MEMORY_BASE, RALINK_PCI0_IMBASEBAR0_ADDR);
	pcie_w32(0x06040001, RALINK_PCI0_CLASS);

	/* enable interrupts */
	pcie_m32(0, PCIINT2, RALINK_PCI_PCIENA);

	/* voodoo from the SDK driver */
	pci_config_read(NULL, 0, 4, 4, &val);
	pci_config_write(NULL, 0, 4, 4, val \| 0x7);

	pci_load_of_ranges(&mt7620_controller, pdev->dev.of_node);
	register_pci_controller(&mt7620_controller);

	return 0;
	}

	int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
	{
	u16 cmd;
	u32 val;
	int irq = 0;

	if ((dev->bus->number == 0) && (slot == 0)) {
	pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR);
	pci_config_write(dev->bus, 0, PCI_BASE_ADDRESS_0, 4,
	RALINK_PCI_MEMORY_BASE);
	pci_config_read(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, &val);
	} else if ((dev->bus->number == 1) && (slot == 0x0)) {
	irq = RALINK_INT_PCIE0;
	} else {
	dev_err(&dev->dev, "no irq found - bus=0x%x, slot = 0x%x\n",
	dev->bus->number, slot);
	return 0;
	}
	dev_err(&dev->dev, "card - bus=0x%x, slot = 0x%x irq=%d\n",
	dev->bus->number, slot, irq);

	/* configure the cache line size to 0x14 */
	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x14);

	/* configure latency timer to 0xff */
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xff);
	pci_read_config_word(dev, PCI_COMMAND, &cmd);

	/* setup the slot */
	cmd = cmd \| PCI_COMMAND_MASTER \| PCI_COMMAND_IO \| PCI_COMMAND_MEMORY;
	pci_write_config_word(dev, PCI_COMMAND, cmd);
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);

	return irq;
	}

	int pcibios_plat_dev_init(struct pci_dev *dev)
	{
	return 0;
	}

	static const struct of_device_id mt7620_pci_ids[] = {
	{ .compatible = "mediatek,mt7620-pci" },
	{},
	};

	static struct platform_driver mt7620_pci_driver = {
	.probe = mt7620_pci_probe,
	.driver = {
	.name = "mt7620-pci",
	.of_match_table = of_match_ptr(mt7620_pci_ids),
	},
	};

	static int __init mt7620_pci_init(void)
	{
	return platform_driver_register(&mt7620_pci_driver);
	}

	arch_initcall(mt7620_pci_init);