drivers/pci/pcie_dw_ti.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2018 Texas Instruments, Inc
  */

 #include <common.h>
 #include <dm.h>
 #include <log.h>
 #include <pci.h>
 #include <generic-phy.h>
 #include <power-domain.h>
 #include <regmap.h>
 #include <syscon.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <asm-generic/gpio.h>
 #include <dm/device_compat.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/err.h>

 #include "pcie_dw_common.h"

 DECLARE_GLOBAL_DATA_PTR;

 #define PCIE_VENDORID_MASK	GENMASK(15, 0)
 #define PCIE_DEVICEID_SHIFT	16

 #define PCIE_LINK_CAPABILITY		0x7c
 #define PCIE_LINK_CTL_2			0xa0
 #define TARGET_LINK_SPEED_MASK		0xf
 #define LINK_SPEED_GEN_1		0x1
 #define LINK_SPEED_GEN_2		0x2
 #define LINK_SPEED_GEN_3		0x3

 #define PCIE_MISC_CONTROL_1_OFF		0x8bc
 #define PCIE_DBI_RO_WR_EN		BIT(0)

 #define PLR_OFFSET			0x700
 #define PCIE_PORT_DEBUG0		(PLR_OFFSET + 0x28)
 #define PORT_LOGIC_LTSSM_STATE_MASK	0x1f
 #define PORT_LOGIC_LTSSM_STATE_L0	0x11

 #define PCIE_LINK_UP_TIMEOUT_MS		100

 /* Offsets from App base */
 #define PCIE_CMD_STATUS			0x04
 #define LTSSM_EN_VAL			BIT(0)


 #define AM654_PCIE_DEV_TYPE_MASK	0x3
 #define EP				0x0
 #define LEG_EP				0x1
 #define RC				0x2

 /**
  * struct pcie_dw_ti - TI DW PCIe controller state
  *
  * @pci: The common PCIe DW structure
  * @app_base: The base address of application register space
  */
 struct pcie_dw_ti {
 	/* Must be first member of the struct */
 	struct pcie_dw dw;
 	void *app_base;
 };

 enum dw_pcie_device_mode {
 	DW_PCIE_UNKNOWN_TYPE,
 	DW_PCIE_EP_TYPE,
 	DW_PCIE_LEG_EP_TYPE,
 	DW_PCIE_RC_TYPE,
 };

 /**
  * pcie_dw_configure() - Configure link capabilities and speed
  *
  * @regs_base: A pointer to the PCIe controller registers
  * @cap_speed: The capabilities and speed to configure
  *
  * Configure the link capabilities and speed in the PCIe root complex.
  */
 static void pcie_dw_configure(struct pcie_dw_ti *pci, u32 cap_speed)
 {
 	u32 val;

 	dw_pcie_dbi_write_enable(&pci->dw, true);

 	val = readl(pci->dw.dbi_base + PCIE_LINK_CAPABILITY);
 	val &= ~TARGET_LINK_SPEED_MASK;
 	val |= cap_speed;
 	writel(val, pci->dw.dbi_base + PCIE_LINK_CAPABILITY);

 	val = readl(pci->dw.dbi_base + PCIE_LINK_CTL_2);
 	val &= ~TARGET_LINK_SPEED_MASK;
 	val |= cap_speed;
 	writel(val, pci->dw.dbi_base + PCIE_LINK_CTL_2);

 	dw_pcie_dbi_write_enable(&pci->dw, false);
 }

 /**
  * is_link_up() - Return the link state
  *
  * @regs_base: A pointer to the PCIe DBICS registers
  *
  * Return: 1 (true) for active line and 0 (false) for no link
  */
 static int is_link_up(struct pcie_dw_ti *pci)
 {
 	u32 val;

 	val = readl(pci->dw.dbi_base + PCIE_PORT_DEBUG0);
 	val &= PORT_LOGIC_LTSSM_STATE_MASK;

 	return (val == PORT_LOGIC_LTSSM_STATE_L0);
 }

 /**
  * wait_link_up() - Wait for the link to come up
  *
  * @regs_base: A pointer to the PCIe controller registers
  *
  * Return: 1 (true) for active line and 0 (false) for no link (timeout)
  */
 static int wait_link_up(struct pcie_dw_ti *pci)
 {
 	unsigned long timeout;

 	timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
 	while (!is_link_up(pci)) {
 		if (get_timer(0) > timeout)
 			return 0;
 	};

 	return 1;
 }

 static int pcie_dw_ti_pcie_link_up(struct pcie_dw_ti *pci, u32 cap_speed)
 {
 	u32 val;

 	if (is_link_up(pci)) {
 		printf("PCI Link already up before configuration!\n");
 		return 1;
 	}

 	/* DW pre link configurations */
 	pcie_dw_configure(pci, cap_speed);

 	/* Initiate link training */
 	val = readl(pci->app_base + PCIE_CMD_STATUS);
 	val |= LTSSM_EN_VAL;
 	writel(val, pci->app_base + PCIE_CMD_STATUS);

 	/* Check that link was established */
 	if (!wait_link_up(pci))
 		return 0;

 	/*
 	 * Link can be established in Gen 1. still need to wait
 	 * till MAC nagaotiation is completed
 	 */
 	udelay(100);

 	return 1;
 }

 static int pcie_am654_set_mode(struct pcie_dw_ti *pci,
 			       enum dw_pcie_device_mode mode)
 {
 	struct regmap *syscon;
 	u32 val;
 	u32 mask;
 	int ret;

 	syscon = syscon_regmap_lookup_by_phandle(pci->dw.dev,
 						 "ti,syscon-pcie-mode");
 	if (IS_ERR(syscon))
 		return 0;

 	mask = AM654_PCIE_DEV_TYPE_MASK;

 	switch (mode) {
 	case DW_PCIE_RC_TYPE:
 		val = RC;
 		break;
 	case DW_PCIE_EP_TYPE:
 		val = EP;
 		break;
 	default:
 		dev_err(pci->dw.dev, "INVALID device type %d\n", mode);
 		return -EINVAL;
 	}

 	ret = regmap_update_bits(syscon, 0, mask, val);
 	if (ret) {
 		dev_err(pci->dw.dev, "failed to set pcie mode\n");
 		return ret;
 	}

 	return 0;
 }

 static int pcie_dw_init_id(struct pcie_dw_ti *pci)
 {
 	struct regmap *devctrl_regs;
 	unsigned int id;
 	int ret;

 	devctrl_regs = syscon_regmap_lookup_by_phandle(pci->dw.dev,
 						       "ti,syscon-pcie-id");
 	if (IS_ERR(devctrl_regs))
 		return PTR_ERR(devctrl_regs);

 	ret = regmap_read(devctrl_regs, 0, &id);
 	if (ret)
 		return ret;

 	dw_pcie_dbi_write_enable(&pci->dw, true);
 	writew(id & PCIE_VENDORID_MASK, pci->dw.dbi_base + PCI_VENDOR_ID);
 	writew(id >> PCIE_DEVICEID_SHIFT, pci->dw.dbi_base + PCI_DEVICE_ID);
 	dw_pcie_dbi_write_enable(&pci->dw, false);

 	return 0;
 }

 /**
  * pcie_dw_ti_probe() - Probe the PCIe bus for active link
  *
  * @dev: A pointer to the device being operated on
  *
  * Probe for an active link on the PCIe bus and configure the controller
  * to enable this port.
  *
  * Return: 0 on success, else -ENODEV
  */
 static int pcie_dw_ti_probe(struct udevice *dev)
 {
 	struct pcie_dw_ti *pci = dev_get_priv(dev);
 	struct udevice *ctlr = pci_get_controller(dev);
 	struct pci_controller *hose = dev_get_uclass_priv(ctlr);
 	struct power_domain pci_pwrdmn;
 	struct phy phy0, phy1;
 	int ret;

 	ret = power_domain_get_by_index(dev, &pci_pwrdmn, 0);
 	if (ret) {
 		dev_err(dev, "failed to get power domain\n");
 		return ret;
 	}

 	ret = power_domain_on(&pci_pwrdmn);
 	if (ret) {
 		dev_err(dev, "Power domain on failed\n");
 		return ret;
 	}

 	ret = generic_phy_get_by_name(dev,  "pcie-phy0", &phy0);
 	if (ret) {
 		dev_err(dev, "Unable to get phy0");
 		return ret;
 	}
 	generic_phy_reset(&phy0);
 	generic_phy_init(&phy0);
 	generic_phy_power_on(&phy0);

 	ret = generic_phy_get_by_name(dev,  "pcie-phy1", &phy1);
 	if (ret) {
 		dev_err(dev, "Unable to get phy1");
 		return ret;
 	}
 	generic_phy_reset(&phy1);
 	generic_phy_init(&phy1);
 	generic_phy_power_on(&phy1);

 	pci->dw.first_busno = dev_seq(dev);
 	pci->dw.dev = dev;

 	pcie_dw_setup_host(&pci->dw);
 	pcie_dw_init_id(pci);

 	if (device_is_compatible(dev, "ti,am654-pcie-rc"))
 		pcie_am654_set_mode(pci, DW_PCIE_RC_TYPE);

 	if (!pcie_dw_ti_pcie_link_up(pci, LINK_SPEED_GEN_2)) {
 		printf("PCIE-%d: Link down\n", dev_seq(dev));
 		return -ENODEV;
 	}

 	printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev_seq(dev),
 	       pcie_dw_get_link_speed(&pci->dw),
 	       pcie_dw_get_link_width(&pci->dw),
 	       hose->first_busno);

 	pcie_dw_prog_outbound_atu_unroll(&pci->dw, PCIE_ATU_REGION_INDEX0,
 					 PCIE_ATU_TYPE_MEM,
 					 pci->dw.mem.phys_start,
 					 pci->dw.mem.bus_start, pci->dw.mem.size);

 	return 0;
 }

 /**
  * pcie_dw_ti_of_to_plat() - Translate from DT to device state
  *
  * @dev: A pointer to the device being operated on
  *
  * Translate relevant data from the device tree pertaining to device @dev into
  * state that the driver will later make use of. This state is stored in the
  * device's private data structure.
  *
  * Return: 0 on success, else -EINVAL
  */
 static int pcie_dw_ti_of_to_plat(struct udevice *dev)
 {
 	struct pcie_dw_ti *pcie = dev_get_priv(dev);

 	/* Get the controller base address */
 	pcie->dw.dbi_base = (void *)dev_read_addr_name(dev, "dbics");
 	if ((fdt_addr_t)pcie->dw.dbi_base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	/* Get the config space base address and size */
 	pcie->dw.cfg_base = (void *)dev_read_addr_size_name(dev, "config",
 							 &pcie->dw.cfg_size);
 	if ((fdt_addr_t)pcie->dw.cfg_base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	/* Get the iATU base address and size */
 	pcie->dw.atu_base = (void *)dev_read_addr_name(dev, "atu");
 	if ((fdt_addr_t)pcie->dw.atu_base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	/* Get the app base address and size */
 	pcie->app_base = (void *)dev_read_addr_name(dev, "app");
 	if ((fdt_addr_t)pcie->app_base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	return 0;
 }

 static const struct dm_pci_ops pcie_dw_ti_ops = {
 	.read_config	= pcie_dw_read_config,
 	.write_config	= pcie_dw_write_config,
 };

 static const struct udevice_id pcie_dw_ti_ids[] = {
 	{ .compatible = "ti,am654-pcie-rc" },
 	{ }
 };

 U_BOOT_DRIVER(pcie_dw_ti) = {
 	.name			= "pcie_dw_ti",
 	.id			= UCLASS_PCI,
 	.of_match		= pcie_dw_ti_ids,
 	.ops			= &pcie_dw_ti_ops,
 	.of_to_plat	= pcie_dw_ti_of_to_plat,
 	.probe			= pcie_dw_ti_probe,
 	.priv_auto	= sizeof(struct pcie_dw_ti),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2018 Texas Instruments, Inc
	*/

	#include <common.h>
	#include <dm.h>
	#include <log.h>
	#include <pci.h>
	#include <generic-phy.h>
	#include <power-domain.h>
	#include <regmap.h>
	#include <syscon.h>
	#include <asm/global_data.h>
	#include <asm/io.h>
	#include <asm-generic/gpio.h>
	#include <dm/device_compat.h>
	#include <linux/bitops.h>
	#include <linux/delay.h>
	#include <linux/err.h>

	#include "pcie_dw_common.h"

	DECLARE_GLOBAL_DATA_PTR;

	#define PCIE_VENDORID_MASK GENMASK(15, 0)
	#define PCIE_DEVICEID_SHIFT 16

	#define PCIE_LINK_CAPABILITY 0x7c
	#define PCIE_LINK_CTL_2 0xa0
	#define TARGET_LINK_SPEED_MASK 0xf
	#define LINK_SPEED_GEN_1 0x1
	#define LINK_SPEED_GEN_2 0x2
	#define LINK_SPEED_GEN_3 0x3

	#define PCIE_MISC_CONTROL_1_OFF 0x8bc
	#define PCIE_DBI_RO_WR_EN BIT(0)

	#define PLR_OFFSET 0x700
	#define PCIE_PORT_DEBUG0 (PLR_OFFSET + 0x28)
	#define PORT_LOGIC_LTSSM_STATE_MASK 0x1f
	#define PORT_LOGIC_LTSSM_STATE_L0 0x11

	#define PCIE_LINK_UP_TIMEOUT_MS 100

	/* Offsets from App base */
	#define PCIE_CMD_STATUS 0x04
	#define LTSSM_EN_VAL BIT(0)


	#define AM654_PCIE_DEV_TYPE_MASK 0x3
	#define EP 0x0
	#define LEG_EP 0x1
	#define RC 0x2

	/**
	* struct pcie_dw_ti - TI DW PCIe controller state
	*
	* @pci: The common PCIe DW structure
	* @app_base: The base address of application register space
	*/
	struct pcie_dw_ti {
	/* Must be first member of the struct */
	struct pcie_dw dw;
	void *app_base;
	};

	enum dw_pcie_device_mode {
	DW_PCIE_UNKNOWN_TYPE,
	DW_PCIE_EP_TYPE,
	DW_PCIE_LEG_EP_TYPE,
	DW_PCIE_RC_TYPE,
	};

	/**
	* pcie_dw_configure() - Configure link capabilities and speed
	*
	* @regs_base: A pointer to the PCIe controller registers
	* @cap_speed: The capabilities and speed to configure
	*
	* Configure the link capabilities and speed in the PCIe root complex.
	*/
	static void pcie_dw_configure(struct pcie_dw_ti *pci, u32 cap_speed)
	{
	u32 val;

	dw_pcie_dbi_write_enable(&pci->dw, true);

	val = readl(pci->dw.dbi_base + PCIE_LINK_CAPABILITY);
	val &= ~TARGET_LINK_SPEED_MASK;
	val \|= cap_speed;
	writel(val, pci->dw.dbi_base + PCIE_LINK_CAPABILITY);

	val = readl(pci->dw.dbi_base + PCIE_LINK_CTL_2);
	val &= ~TARGET_LINK_SPEED_MASK;
	val \|= cap_speed;
	writel(val, pci->dw.dbi_base + PCIE_LINK_CTL_2);

	dw_pcie_dbi_write_enable(&pci->dw, false);
	}

	/**
	* is_link_up() - Return the link state
	*
	* @regs_base: A pointer to the PCIe DBICS registers
	*
	* Return: 1 (true) for active line and 0 (false) for no link
	*/
	static int is_link_up(struct pcie_dw_ti *pci)
	{
	u32 val;

	val = readl(pci->dw.dbi_base + PCIE_PORT_DEBUG0);
	val &= PORT_LOGIC_LTSSM_STATE_MASK;

	return (val == PORT_LOGIC_LTSSM_STATE_L0);
	}

	/**
	* wait_link_up() - Wait for the link to come up
	*
	* @regs_base: A pointer to the PCIe controller registers
	*
	* Return: 1 (true) for active line and 0 (false) for no link (timeout)
	*/
	static int wait_link_up(struct pcie_dw_ti *pci)
	{
	unsigned long timeout;

	timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
	while (!is_link_up(pci)) {
	if (get_timer(0) > timeout)
	return 0;
	};

	return 1;
	}

	static int pcie_dw_ti_pcie_link_up(struct pcie_dw_ti *pci, u32 cap_speed)
	{
	u32 val;

	if (is_link_up(pci)) {
	printf("PCI Link already up before configuration!\n");
	return 1;
	}

	/* DW pre link configurations */
	pcie_dw_configure(pci, cap_speed);

	/* Initiate link training */
	val = readl(pci->app_base + PCIE_CMD_STATUS);
	val \|= LTSSM_EN_VAL;
	writel(val, pci->app_base + PCIE_CMD_STATUS);

	/* Check that link was established */
	if (!wait_link_up(pci))
	return 0;

	/*
	* Link can be established in Gen 1. still need to wait
	* till MAC nagaotiation is completed
	*/
	udelay(100);

	return 1;
	}

	static int pcie_am654_set_mode(struct pcie_dw_ti *pci,
	enum dw_pcie_device_mode mode)
	{
	struct regmap *syscon;
	u32 val;
	u32 mask;
	int ret;

	syscon = syscon_regmap_lookup_by_phandle(pci->dw.dev,
	"ti,syscon-pcie-mode");
	if (IS_ERR(syscon))
	return 0;

	mask = AM654_PCIE_DEV_TYPE_MASK;

	switch (mode) {
	case DW_PCIE_RC_TYPE:
	val = RC;
	break;
	case DW_PCIE_EP_TYPE:
	val = EP;
	break;
	default:
	dev_err(pci->dw.dev, "INVALID device type %d\n", mode);
	return -EINVAL;
	}

	ret = regmap_update_bits(syscon, 0, mask, val);
	if (ret) {
	dev_err(pci->dw.dev, "failed to set pcie mode\n");
	return ret;
	}

	return 0;
	}

	static int pcie_dw_init_id(struct pcie_dw_ti *pci)
	{
	struct regmap *devctrl_regs;
	unsigned int id;
	int ret;

	devctrl_regs = syscon_regmap_lookup_by_phandle(pci->dw.dev,
	"ti,syscon-pcie-id");
	if (IS_ERR(devctrl_regs))
	return PTR_ERR(devctrl_regs);

	ret = regmap_read(devctrl_regs, 0, &id);
	if (ret)
	return ret;

	dw_pcie_dbi_write_enable(&pci->dw, true);
	writew(id & PCIE_VENDORID_MASK, pci->dw.dbi_base + PCI_VENDOR_ID);
	writew(id >> PCIE_DEVICEID_SHIFT, pci->dw.dbi_base + PCI_DEVICE_ID);
	dw_pcie_dbi_write_enable(&pci->dw, false);

	return 0;
	}

	/**
	* pcie_dw_ti_probe() - Probe the PCIe bus for active link
	*
	* @dev: A pointer to the device being operated on
	*
	* Probe for an active link on the PCIe bus and configure the controller
	* to enable this port.
	*
	* Return: 0 on success, else -ENODEV
	*/
	static int pcie_dw_ti_probe(struct udevice *dev)
	{
	struct pcie_dw_ti *pci = dev_get_priv(dev);
	struct udevice *ctlr = pci_get_controller(dev);
	struct pci_controller *hose = dev_get_uclass_priv(ctlr);
	struct power_domain pci_pwrdmn;
	struct phy phy0, phy1;
	int ret;

	ret = power_domain_get_by_index(dev, &pci_pwrdmn, 0);
	if (ret) {
	dev_err(dev, "failed to get power domain\n");
	return ret;
	}

	ret = power_domain_on(&pci_pwrdmn);
	if (ret) {
	dev_err(dev, "Power domain on failed\n");
	return ret;
	}

	ret = generic_phy_get_by_name(dev, "pcie-phy0", &phy0);
	if (ret) {
	dev_err(dev, "Unable to get phy0");
	return ret;
	}
	generic_phy_reset(&phy0);
	generic_phy_init(&phy0);
	generic_phy_power_on(&phy0);

	ret = generic_phy_get_by_name(dev, "pcie-phy1", &phy1);
	if (ret) {
	dev_err(dev, "Unable to get phy1");
	return ret;
	}
	generic_phy_reset(&phy1);
	generic_phy_init(&phy1);
	generic_phy_power_on(&phy1);

	pci->dw.first_busno = dev_seq(dev);
	pci->dw.dev = dev;

	pcie_dw_setup_host(&pci->dw);
	pcie_dw_init_id(pci);

	if (device_is_compatible(dev, "ti,am654-pcie-rc"))
	pcie_am654_set_mode(pci, DW_PCIE_RC_TYPE);

	if (!pcie_dw_ti_pcie_link_up(pci, LINK_SPEED_GEN_2)) {
	printf("PCIE-%d: Link down\n", dev_seq(dev));
	return -ENODEV;
	}

	printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev_seq(dev),
	pcie_dw_get_link_speed(&pci->dw),
	pcie_dw_get_link_width(&pci->dw),
	hose->first_busno);

	pcie_dw_prog_outbound_atu_unroll(&pci->dw, PCIE_ATU_REGION_INDEX0,
	PCIE_ATU_TYPE_MEM,
	pci->dw.mem.phys_start,
	pci->dw.mem.bus_start, pci->dw.mem.size);

	return 0;
	}

	/**
	* pcie_dw_ti_of_to_plat() - Translate from DT to device state
	*
	* @dev: A pointer to the device being operated on
	*
	* Translate relevant data from the device tree pertaining to device @dev into
	* state that the driver will later make use of. This state is stored in the
	* device's private data structure.
	*
	* Return: 0 on success, else -EINVAL
	*/
	static int pcie_dw_ti_of_to_plat(struct udevice *dev)
	{
	struct pcie_dw_ti *pcie = dev_get_priv(dev);

	/* Get the controller base address */
	pcie->dw.dbi_base = (void *)dev_read_addr_name(dev, "dbics");
	if ((fdt_addr_t)pcie->dw.dbi_base == FDT_ADDR_T_NONE)
	return -EINVAL;

	/* Get the config space base address and size */
	pcie->dw.cfg_base = (void *)dev_read_addr_size_name(dev, "config",
	&pcie->dw.cfg_size);
	if ((fdt_addr_t)pcie->dw.cfg_base == FDT_ADDR_T_NONE)
	return -EINVAL;

	/* Get the iATU base address and size */
	pcie->dw.atu_base = (void *)dev_read_addr_name(dev, "atu");
	if ((fdt_addr_t)pcie->dw.atu_base == FDT_ADDR_T_NONE)
	return -EINVAL;

	/* Get the app base address and size */
	pcie->app_base = (void *)dev_read_addr_name(dev, "app");
	if ((fdt_addr_t)pcie->app_base == FDT_ADDR_T_NONE)
	return -EINVAL;

	return 0;
	}

	static const struct dm_pci_ops pcie_dw_ti_ops = {
	.read_config = pcie_dw_read_config,
	.write_config = pcie_dw_write_config,
	};

	static const struct udevice_id pcie_dw_ti_ids[] = {
	{ .compatible = "ti,am654-pcie-rc" },
	{ }
	};

	U_BOOT_DRIVER(pcie_dw_ti) = {
	.name = "pcie_dw_ti",
	.id = UCLASS_PCI,
	.of_match = pcie_dw_ti_ids,
	.ops = &pcie_dw_ti_ops,
	.of_to_plat = pcie_dw_ti_of_to_plat,
	.probe = pcie_dw_ti_probe,
	.priv_auto = sizeof(struct pcie_dw_ti),
	};