// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  This contains the functions to handle the pci driver.

  Copyright (C) 2011-2012  Vayavya Labs Pvt Ltd


  Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/

#include <linux/pci.h>
#include <linux/dmi.h>

#include "stmmac.h"

/*
 * This struct is used to associate PCI Function of MAC controller on a board,
 * discovered via DMI, with the address of PHY connected to the MAC. The
 * negative value of the address means that MAC controller is not connected
 * with PHY.
 */
struct stmmac_pci_func_data {
	unsigned int func;
	int phy_addr;
};

struct stmmac_pci_dmi_data {
	const struct stmmac_pci_func_data *func;
	size_t nfuncs;
};

struct stmmac_pci_info {
	int (*setup)(struct pci_dev *pdev, struct plat_stmmacenet_data *plat);
};

static int stmmac_pci_find_phy_addr(struct pci_dev *pdev,
				    const struct dmi_system_id *dmi_list)
{
	const struct stmmac_pci_func_data *func_data;
	const struct stmmac_pci_dmi_data *dmi_data;
	const struct dmi_system_id *dmi_id;
	int func = PCI_FUNC(pdev->devfn);
	size_t n;

	dmi_id = dmi_first_match(dmi_list);
	if (!dmi_id)
		return -ENODEV;

	dmi_data = dmi_id->driver_data;
	func_data = dmi_data->func;

	for (n = 0; n < dmi_data->nfuncs; n++, func_data++)
		if (func_data->func == func)
			return func_data->phy_addr;

	return -ENODEV;
}

static void common_default_data(struct plat_stmmacenet_data *plat)
{
	plat->clk_csr = 2;	/* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
	plat->has_gmac = 1;
	plat->force_sf_dma_mode = 1;

	plat->mdio_bus_data->phy_reset = NULL;
	plat->mdio_bus_data->phy_mask = 0;

	/* Set default value for multicast hash bins */
	plat->multicast_filter_bins = HASH_TABLE_SIZE;

	/* Set default value for unicast filter entries */
	plat->unicast_filter_entries = 1;

	/* Set the maxmtu to a default of JUMBO_LEN */
	plat->maxmtu = JUMBO_LEN;

	/* Set default number of RX and TX queues to use */
	plat->tx_queues_to_use = 1;
	plat->rx_queues_to_use = 1;

	/* Disable Priority config by default */
	plat->tx_queues_cfg[0].use_prio = false;
	plat->rx_queues_cfg[0].use_prio = false;

	/* Disable RX queues routing by default */
	plat->rx_queues_cfg[0].pkt_route = 0x0;
}

static int stmmac_default_data(struct pci_dev *pdev,
			       struct plat_stmmacenet_data *plat)
{
	/* Set common default data first */
	common_default_data(plat);

	plat->bus_id = 1;
	plat->phy_addr = 0;
	plat->interface = PHY_INTERFACE_MODE_GMII;

	plat->dma_cfg->pbl = 32;
	plat->dma_cfg->pblx8 = true;
	/* TODO: AXI */

	return 0;
}

static const struct stmmac_pci_info stmmac_pci_info = {
	.setup = stmmac_default_data,
};

static const struct stmmac_pci_func_data galileo_stmmac_func_data[] = {
	{
		.func = 6,
		.phy_addr = 1,
	},
};

static const struct stmmac_pci_dmi_data galileo_stmmac_dmi_data = {
	.func = galileo_stmmac_func_data,
	.nfuncs = ARRAY_SIZE(galileo_stmmac_func_data),
};

static const struct stmmac_pci_func_data iot2040_stmmac_func_data[] = {
	{
		.func = 6,
		.phy_addr = 1,
	},
	{
		.func = 7,
		.phy_addr = 1,
	},
};

static const struct stmmac_pci_dmi_data iot2040_stmmac_dmi_data = {
	.func = iot2040_stmmac_func_data,
	.nfuncs = ARRAY_SIZE(iot2040_stmmac_func_data),
};

static const struct dmi_system_id quark_pci_dmi[] = {
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
		},
		.driver_data = (void *)&galileo_stmmac_dmi_data,
	},
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
		},
		.driver_data = (void *)&galileo_stmmac_dmi_data,
	},
	/*
	 * There are 2 types of SIMATIC IOT2000: IOT2020 and IOT2040.
	 * The asset tag "6ES7647-0AA00-0YA2" is only for IOT2020 which
	 * has only one pci network device while other asset tags are
	 * for IOT2040 which has two.
	 */
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
			DMI_EXACT_MATCH(DMI_BOARD_ASSET_TAG,
					"6ES7647-0AA00-0YA2"),
		},
		.driver_data = (void *)&galileo_stmmac_dmi_data,
	},
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
		},
		.driver_data = (void *)&iot2040_stmmac_dmi_data,
	},
	{}
};

static int quark_default_data(struct pci_dev *pdev,
			      struct plat_stmmacenet_data *plat)
{
	int ret;

	/* Set common default data first */
	common_default_data(plat);

	/*
	 * Refuse to load the driver and register net device if MAC controller
	 * does not connect to any PHY interface.
	 */
	ret = stmmac_pci_find_phy_addr(pdev, quark_pci_dmi);
	if (ret < 0) {
		/* Return error to the caller on DMI enabled boards. */
		if (dmi_get_system_info(DMI_BOARD_NAME))
			return ret;

		/*
		 * Galileo boards with old firmware don't support DMI. We always
		 * use 1 here as PHY address, so at least the first found MAC
		 * controller would be probed.
		 */
		ret = 1;
	}

	plat->bus_id = pci_dev_id(pdev);
	plat->phy_addr = ret;
	plat->interface = PHY_INTERFACE_MODE_RMII;

	plat->dma_cfg->pbl = 16;
	plat->dma_cfg->pblx8 = true;
	plat->dma_cfg->fixed_burst = 1;
	/* AXI (TODO) */

	return 0;
}

static const struct stmmac_pci_info quark_pci_info = {
	.setup = quark_default_data,
};

/**
 * stmmac_pci_probe
 *
 * @pdev: pci device pointer
 * @id: pointer to table of device id/id's.
 *
 * Description: This probing function gets called for all PCI devices which
 * match the ID table and are not "owned" by other driver yet. This function
 * gets passed a "struct pci_dev *" for each device whose entry in the ID table
 * matches the device. The probe functions returns zero when the driver choose
 * to take "ownership" of the device or an error code(-ve no) otherwise.
 */
static int stmmac_pci_probe(struct pci_dev *pdev,
			    const struct pci_device_id *id)
{
	struct stmmac_pci_info *info = (struct stmmac_pci_info *)id->driver_data;
	struct plat_stmmacenet_data *plat;
	struct stmmac_resources res;
	int i;
	int ret;

	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
	if (!plat)
		return -ENOMEM;

	plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
					   sizeof(*plat->mdio_bus_data),
					   GFP_KERNEL);
	if (!plat->mdio_bus_data)
		return -ENOMEM;

	plat->dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*plat->dma_cfg),
				     GFP_KERNEL);
	if (!plat->dma_cfg)
		return -ENOMEM;

	/* Enable pci device */
	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev, "%s: ERROR: failed to enable device\n",
			__func__);
		return ret;
	}

	/* Get the base address of device */
	for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
		if (pci_resource_len(pdev, i) == 0)
			continue;
		ret = pcim_iomap_regions(pdev, BIT(i), pci_name(pdev));
		if (ret)
			return ret;
		break;
	}

	pci_set_master(pdev);

	ret = info->setup(pdev, plat);
	if (ret)
		return ret;

	pci_enable_msi(pdev);

	memset(&res, 0, sizeof(res));
	res.addr = pcim_iomap_table(pdev)[i];
	res.wol_irq = pdev->irq;
	res.irq = pdev->irq;

	return stmmac_dvr_probe(&pdev->dev, plat, &res);
}

/**
 * stmmac_pci_remove
 *
 * @pdev: platform device pointer
 * Description: this function calls the main to free the net resources
 * and releases the PCI resources.
 */
static void stmmac_pci_remove(struct pci_dev *pdev)
{
	int i;

	stmmac_dvr_remove(&pdev->dev);

	for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
		if (pci_resource_len(pdev, i) == 0)
			continue;
		pcim_iounmap_regions(pdev, BIT(i));
		break;
	}

	pci_disable_device(pdev);
}

static int __maybe_unused stmmac_pci_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	int ret;

	ret = stmmac_suspend(dev);
	if (ret)
		return ret;

	ret = pci_save_state(pdev);
	if (ret)
		return ret;

	pci_disable_device(pdev);
	pci_wake_from_d3(pdev, true);
	return 0;
}

static int __maybe_unused stmmac_pci_resume(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	int ret;

	pci_restore_state(pdev);
	pci_set_power_state(pdev, PCI_D0);

	ret = pci_enable_device(pdev);
	if (ret)
		return ret;

	pci_set_master(pdev);

	return stmmac_resume(dev);
}

static SIMPLE_DEV_PM_OPS(stmmac_pm_ops, stmmac_pci_suspend, stmmac_pci_resume);

/* synthetic ID, no official vendor */
#define PCI_VENDOR_ID_STMMAC 0x700

#define STMMAC_QUARK_ID  0x0937
#define STMMAC_DEVICE_ID 0x1108

#define STMMAC_DEVICE(vendor_id, dev_id, info)	{	\
	PCI_VDEVICE(vendor_id, dev_id),			\
	.driver_data = (kernel_ulong_t)&info		\
	}

static const struct pci_device_id stmmac_id_table[] = {
	STMMAC_DEVICE(STMMAC, STMMAC_DEVICE_ID, stmmac_pci_info),
	STMMAC_DEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_MAC, stmmac_pci_info),
	STMMAC_DEVICE(INTEL, STMMAC_QUARK_ID, quark_pci_info),
	{}
};

MODULE_DEVICE_TABLE(pci, stmmac_id_table);

static struct pci_driver stmmac_pci_driver = {
	.name = STMMAC_RESOURCE_NAME,
	.id_table = stmmac_id_table,
	.probe = stmmac_pci_probe,
	.remove = stmmac_pci_remove,
	.driver         = {
		.pm     = &stmmac_pm_ops,
	},
};

module_pci_driver(stmmac_pci_driver);

MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet PCI driver");
MODULE_AUTHOR("Rayagond Kokatanur <rayagond.kokatanur@vayavyalabs.com>");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL");