// SPDX-License-Identifier: GPL-2.0-or-later
/*
        Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
        <http://rt2x00.serialmonkey.com>

 */

/*
        Module: rt2x00pci
        Abstract: rt2x00 generic pci device routines.
 */

#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>

#include "rt2x00.h"
#include "rt2x00pci.h"

/*
 * PCI driver handlers.
 */
static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
{
        kfree(rt2x00dev->rf);
        rt2x00dev->rf = NULL;

        kfree(rt2x00dev->eeprom);
        rt2x00dev->eeprom = NULL;

        if (rt2x00dev->csr.base) {
                iounmap(rt2x00dev->csr.base);
                rt2x00dev->csr.base = NULL;
        }
}

static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
{
        struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);

        rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
        if (!rt2x00dev->csr.base)
                goto exit;

        rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
        if (!rt2x00dev->eeprom)
                goto exit;

        rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
        if (!rt2x00dev->rf)
                goto exit;

        return 0;

exit:
        rt2x00_probe_err("Failed to allocate registers\n");

        rt2x00pci_free_reg(rt2x00dev);

        return -ENOMEM;
}

int rt2x00pci_probe(struct pci_dev *pci_dev, const struct rt2x00_ops *ops)
{
        struct ieee80211_hw *hw;
        struct rt2x00_dev *rt2x00dev;
        int retval;
        u16 chip;

        retval = pci_enable_device(pci_dev);
        if (retval) {
                rt2x00_probe_err("Enable device failed\n");
                return retval;
        }

        retval = pci_request_regions(pci_dev, pci_name(pci_dev));
        if (retval) {
                rt2x00_probe_err("PCI request regions failed\n");
                goto exit_disable_device;
        }

        pci_set_master(pci_dev);

        if (pci_set_mwi(pci_dev))
                rt2x00_probe_err("MWI not available\n");

        if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
                rt2x00_probe_err("PCI DMA not supported\n");
                retval = -EIO;
                goto exit_release_regions;
        }

        hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
        if (!hw) {
                rt2x00_probe_err("Failed to allocate hardware\n");
                retval = -ENOMEM;
                goto exit_release_regions;
        }

        pci_set_drvdata(pci_dev, hw);

        rt2x00dev = hw->priv;
        rt2x00dev->dev = &pci_dev->dev;
        rt2x00dev->ops = ops;
        rt2x00dev->hw = hw;
        rt2x00dev->irq = pci_dev->irq;
        rt2x00dev->name = ops->name;

        if (pci_is_pcie(pci_dev))
                rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
        else
                rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);

        retval = rt2x00pci_alloc_reg(rt2x00dev);
        if (retval)
                goto exit_free_device;

        /*
         * Because rt3290 chip use different efuse offset to read efuse data.
         * So before read efuse it need to indicate it is the
         * rt3290 or not.
         */
        pci_read_config_word(pci_dev, PCI_DEVICE_ID, &chip);
        rt2x00dev->chip.rt = chip;

        retval = rt2x00lib_probe_dev(rt2x00dev);
        if (retval)
                goto exit_free_reg;

        return 0;

exit_free_reg:
        rt2x00pci_free_reg(rt2x00dev);

exit_free_device:
        ieee80211_free_hw(hw);

exit_release_regions:
        pci_clear_mwi(pci_dev);
        pci_release_regions(pci_dev);

exit_disable_device:
        pci_disable_device(pci_dev);

        return retval;
}
EXPORT_SYMBOL_GPL(rt2x00pci_probe);

void rt2x00pci_remove(struct pci_dev *pci_dev)
{
        struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
        struct rt2x00_dev *rt2x00dev = hw->priv;

        /*
         * Free all allocated data.
         */
        rt2x00lib_remove_dev(rt2x00dev);
        rt2x00pci_free_reg(rt2x00dev);
        ieee80211_free_hw(hw);

        /*
         * Free the PCI device data.
         */
        pci_clear_mwi(pci_dev);
        pci_disable_device(pci_dev);
        pci_release_regions(pci_dev);
}
EXPORT_SYMBOL_GPL(rt2x00pci_remove);

static int __maybe_unused rt2x00pci_suspend(struct device *dev)
{
        struct ieee80211_hw *hw = dev_get_drvdata(dev);
        struct rt2x00_dev *rt2x00dev = hw->priv;

        return rt2x00lib_suspend(rt2x00dev);
}

static int __maybe_unused rt2x00pci_resume(struct device *dev)
{
        struct ieee80211_hw *hw = dev_get_drvdata(dev);
        struct rt2x00_dev *rt2x00dev = hw->priv;

        return rt2x00lib_resume(rt2x00dev);
}

SIMPLE_DEV_PM_OPS(rt2x00pci_pm_ops, rt2x00pci_suspend, rt2x00pci_resume);
EXPORT_SYMBOL_GPL(rt2x00pci_pm_ops);

/*
 * rt2x00pci module information.
 */
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 pci library");
MODULE_LICENSE("GPL");