/*
 * Copyright (c) 2012-2017 Qualcomm Atheros, Inc.
 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/suspend.h>
#include "wil6210.h"
#include <linux/rtnetlink.h>
#include <linux/pm_runtime.h>

static bool use_msi = true;
module_param(use_msi, bool, 0444);
MODULE_PARM_DESC(use_msi, " Use MSI interrupt, default - true");

static bool ftm_mode;
module_param(ftm_mode, bool, 0444);
MODULE_PARM_DESC(ftm_mode, " Set factory test mode, default - false");

static int wil6210_pm_notify(struct notifier_block *notify_block,
                             unsigned long mode, void *unused);

static
int wil_set_capabilities(struct wil6210_priv *wil)
{
        const char *wil_fw_name;
        u32 jtag_id = wil_r(wil, RGF_USER_JTAG_DEV_ID);
        u8 chip_revision = (wil_r(wil, RGF_USER_REVISION_ID) &
                            RGF_USER_REVISION_ID_MASK);
        int platform_capa;
        struct fw_map *iccm_section, *sct;

        bitmap_zero(wil->hw_capa, hw_capa_last);
        bitmap_zero(wil->fw_capabilities, WMI_FW_CAPABILITY_MAX);
        bitmap_zero(wil->platform_capa, WIL_PLATFORM_CAPA_MAX);
        wil->wil_fw_name = ftm_mode ? WIL_FW_NAME_FTM_DEFAULT :
                           WIL_FW_NAME_DEFAULT;
        wil->chip_revision = chip_revision;

        switch (jtag_id) {
        case JTAG_DEV_ID_SPARROW:
                memcpy(fw_mapping, sparrow_fw_mapping,
                       sizeof(sparrow_fw_mapping));
                switch (chip_revision) {
                case REVISION_ID_SPARROW_D0:
                        wil->hw_name = "Sparrow D0";
                        wil->hw_version = HW_VER_SPARROW_D0;
                        wil_fw_name = ftm_mode ? WIL_FW_NAME_FTM_SPARROW_PLUS :
                                      WIL_FW_NAME_SPARROW_PLUS;

                        if (wil_fw_verify_file_exists(wil, wil_fw_name))
                                wil->wil_fw_name = wil_fw_name;
                        sct = wil_find_fw_mapping("mac_rgf_ext");
                        if (!sct) {
                                wil_err(wil, "mac_rgf_ext section not found in fw_mapping\n");
                                return -EINVAL;
                        }
                        memcpy(sct, &sparrow_d0_mac_rgf_ext, sizeof(*sct));
                        break;
                case REVISION_ID_SPARROW_B0:
                        wil->hw_name = "Sparrow B0";
                        wil->hw_version = HW_VER_SPARROW_B0;
                        break;
                default:
                        wil->hw_name = "Unknown";
                        wil->hw_version = HW_VER_UNKNOWN;
                        break;
                }
                wil->rgf_fw_assert_code_addr = SPARROW_RGF_FW_ASSERT_CODE;
                wil->rgf_ucode_assert_code_addr = SPARROW_RGF_UCODE_ASSERT_CODE;
                break;
        case JTAG_DEV_ID_TALYN:
                wil->hw_name = "Talyn";
                wil->hw_version = HW_VER_TALYN;
                memcpy(fw_mapping, talyn_fw_mapping, sizeof(talyn_fw_mapping));
                wil->rgf_fw_assert_code_addr = TALYN_RGF_FW_ASSERT_CODE;
                wil->rgf_ucode_assert_code_addr = TALYN_RGF_UCODE_ASSERT_CODE;
                if (wil_r(wil, RGF_USER_OTP_HW_RD_MACHINE_1) &
                    BIT_NO_FLASH_INDICATION)
                        set_bit(hw_capa_no_flash, wil->hw_capa);
                break;
        default:
                wil_err(wil, "Unknown board hardware, chip_id 0x%08x, chip_revision 0x%08x\n",
                        jtag_id, chip_revision);
                wil->hw_name = "Unknown";
                wil->hw_version = HW_VER_UNKNOWN;
                return -EINVAL;
        }

        iccm_section = wil_find_fw_mapping("fw_code");
        if (!iccm_section) {
                wil_err(wil, "fw_code section not found in fw_mapping\n");
                return -EINVAL;
        }
        wil->iccm_base = iccm_section->host;

        wil_info(wil, "Board hardware is %s, flash %sexist\n", wil->hw_name,
                 test_bit(hw_capa_no_flash, wil->hw_capa) ? "doesn't " : "");

        /* Get platform capabilities */
        if (wil->platform_ops.get_capa) {
                platform_capa =
                        wil->platform_ops.get_capa(wil->platform_handle);
                memcpy(wil->platform_capa, &platform_capa,
                       min(sizeof(wil->platform_capa), sizeof(platform_capa)));
        }

        /* extract FW capabilities from file without loading the FW */
        wil_request_firmware(wil, wil->wil_fw_name, false);
        wil_refresh_fw_capabilities(wil);

        return 0;
}

void wil_disable_irq(struct wil6210_priv *wil)
{
        disable_irq(wil->pdev->irq);
}

void wil_enable_irq(struct wil6210_priv *wil)
{
        enable_irq(wil->pdev->irq);
}

static void wil_remove_all_additional_vifs(struct wil6210_priv *wil)
{
        struct wil6210_vif *vif;
        int i;

        for (i = 1; i < wil->max_vifs; i++) {
                vif = wil->vifs[i];
                if (vif) {
                        wil_vif_prepare_stop(vif);
                        wil_vif_remove(wil, vif->mid);
                }
        }
}

/* Bus ops */
static int wil_if_pcie_enable(struct wil6210_priv *wil)
{
        struct pci_dev *pdev = wil->pdev;
        int rc;
        /* on platforms with buggy ACPI, pdev->msi_enabled may be set to
         * allow pci_enable_device to work. This indicates INTx was not routed
         * and only MSI should be used
         */
        int msi_only = pdev->msi_enabled;
        bool _use_msi = use_msi;

        wil_dbg_misc(wil, "if_pcie_enable\n");

        pci_set_master(pdev);

        wil_dbg_misc(wil, "Setup %s interrupt\n", use_msi ? "MSI" : "INTx");

        if (use_msi && pci_enable_msi(pdev)) {
                wil_err(wil, "pci_enable_msi failed, use INTx\n");
                _use_msi = false;
        }

        if (!_use_msi && msi_only) {
                wil_err(wil, "Interrupt pin not routed, unable to use INTx\n");
                rc = -ENODEV;
                goto stop_master;
        }

        rc = wil6210_init_irq(wil, pdev->irq, _use_msi);
        if (rc)
                goto stop_master;

        /* need reset here to obtain MAC */
        mutex_lock(&wil->mutex);
        rc = wil_reset(wil, false);
        mutex_unlock(&wil->mutex);
        if (rc)
                goto release_irq;

        return 0;

 release_irq:
        wil6210_fini_irq(wil, pdev->irq);
        /* safe to call if no MSI */
        pci_disable_msi(pdev);
 stop_master:
        pci_clear_master(pdev);
        return rc;
}

static int wil_if_pcie_disable(struct wil6210_priv *wil)
{
        struct pci_dev *pdev = wil->pdev;

        wil_dbg_misc(wil, "if_pcie_disable\n");

        pci_clear_master(pdev);
        /* disable and release IRQ */
        wil6210_fini_irq(wil, pdev->irq);
        /* safe to call if no MSI */
        pci_disable_msi(pdev);
        /* TODO: disable HW */

        return 0;
}

static int wil_platform_rop_ramdump(void *wil_handle, void *buf, uint32_t size)
{
        struct wil6210_priv *wil = wil_handle;

        if (!wil)
                return -EINVAL;

        return wil_fw_copy_crash_dump(wil, buf, size);
}

static int wil_platform_rop_fw_recovery(void *wil_handle)
{
        struct wil6210_priv *wil = wil_handle;

        if (!wil)
                return -EINVAL;

        wil_fw_error_recovery(wil);

        return 0;
}

static void wil_platform_ops_uninit(struct wil6210_priv *wil)
{
        if (wil->platform_ops.uninit)
                wil->platform_ops.uninit(wil->platform_handle);
        memset(&wil->platform_ops, 0, sizeof(wil->platform_ops));
}

static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
        struct wil6210_priv *wil;
        struct device *dev = &pdev->dev;
        int rc;
        const struct wil_platform_rops rops = {
                .ramdump = wil_platform_rop_ramdump,
                .fw_recovery = wil_platform_rop_fw_recovery,
        };
        u32 bar_size = pci_resource_len(pdev, 0);
        int dma_addr_size[] = {48, 40, 32}; /* keep descending order */
        int i;

        /* check HW */
        dev_info(&pdev->dev, WIL_NAME
                 " device found [%04x:%04x] (rev %x) bar size 0x%x\n",
                 (int)pdev->vendor, (int)pdev->device, (int)pdev->revision,
                 bar_size);

        if ((bar_size < WIL6210_MIN_MEM_SIZE) ||
            (bar_size > WIL6210_MAX_MEM_SIZE)) {
                dev_err(&pdev->dev, "Unexpected BAR0 size 0x%x\n",
                        bar_size);
                return -ENODEV;
        }

        wil = wil_if_alloc(dev);
        if (IS_ERR(wil)) {
                rc = (int)PTR_ERR(wil);
                dev_err(dev, "wil_if_alloc failed: %d\n", rc);
                return rc;
        }

        wil->pdev = pdev;
        pci_set_drvdata(pdev, wil);
        wil->bar_size = bar_size;
        /* rollback to if_free */

        wil->platform_handle =
                wil_platform_init(&pdev->dev, &wil->platform_ops, &rops, wil);
        if (!wil->platform_handle) {
                rc = -ENODEV;
                wil_err(wil, "wil_platform_init failed\n");
                goto if_free;
        }
        /* rollback to err_plat */

        /* device supports >32bit addresses */
        for (i = 0; i < ARRAY_SIZE(dma_addr_size); i++) {
                rc = dma_set_mask_and_coherent(dev,
                                               DMA_BIT_MASK(dma_addr_size[i]));
                if (rc) {
                        dev_err(dev, "dma_set_mask_and_coherent(%d) failed: %d\n",
                                dma_addr_size[i], rc);
                        continue;
                }
                dev_info(dev, "using dma mask %d", dma_addr_size[i]);
                wil->dma_addr_size = dma_addr_size[i];
                break;
        }

        if (wil->dma_addr_size == 0)
                goto err_plat;

        rc = pci_enable_device(pdev);
        if (rc && pdev->msi_enabled == 0) {
                wil_err(wil,
                        "pci_enable_device failed, retry with MSI only\n");
                /* Work around for platforms that can't allocate IRQ:
                 * retry with MSI only
                 */
                pdev->msi_enabled = 1;
                rc = pci_enable_device(pdev);
        }
        if (rc) {
                wil_err(wil,
                        "pci_enable_device failed, even with MSI only\n");
                goto err_plat;
        }
        /* rollback to err_disable_pdev */
        pci_set_power_state(pdev, PCI_D0);

        rc = pci_request_region(pdev, 0, WIL_NAME);
        if (rc) {
                wil_err(wil, "pci_request_region failed\n");
                goto err_disable_pdev;
        }
        /* rollback to err_release_reg */

        wil->csr = pci_ioremap_bar(pdev, 0);
        if (!wil->csr) {
                wil_err(wil, "pci_ioremap_bar failed\n");
                rc = -ENODEV;
                goto err_release_reg;
        }
        /* rollback to err_iounmap */
        wil_info(wil, "CSR at %pR -> 0x%p\n", &pdev->resource[0], wil->csr);

        rc = wil_set_capabilities(wil);
        if (rc) {
                wil_err(wil, "wil_set_capabilities failed, rc %d\n", rc);
                goto err_iounmap;
        }
        wil6210_clear_irq(wil);

        /* FW should raise IRQ when ready */
        rc = wil_if_pcie_enable(wil);
        if (rc) {
                wil_err(wil, "Enable device failed\n");
                goto err_iounmap;
        }
        /* rollback to bus_disable */

        rc = wil_if_add(wil);
        if (rc) {
                wil_err(wil, "wil_if_add failed: %d\n", rc);
                goto bus_disable;
        }

        /* in case of WMI-only FW, perform full reset and FW loading */
        if (test_bit(WMI_FW_CAPABILITY_WMI_ONLY, wil->fw_capabilities)) {
                wil_dbg_misc(wil, "Loading WMI only FW\n");
                mutex_lock(&wil->mutex);
                rc = wil_reset(wil, true);
                mutex_unlock(&wil->mutex);
                if (rc) {
                        wil_err(wil, "failed to load WMI only FW\n");
                        goto if_remove;
                }
        }

        if (IS_ENABLED(CONFIG_PM))
                wil->pm_notify.notifier_call = wil6210_pm_notify;

        rc = register_pm_notifier(&wil->pm_notify);
        if (rc)
                /* Do not fail the driver initialization, as suspend can
                 * be prevented in a later phase if needed
                 */
                wil_err(wil, "register_pm_notifier failed: %d\n", rc);

        wil6210_debugfs_init(wil);

        wil_pm_runtime_allow(wil);

        return 0;

if_remove:
        wil_if_remove(wil);
bus_disable:
        wil_if_pcie_disable(wil);
err_iounmap:
        pci_iounmap(pdev, wil->csr);
err_release_reg:
        pci_release_region(pdev, 0);
err_disable_pdev:
        pci_disable_device(pdev);
err_plat:
        wil_platform_ops_uninit(wil);
if_free:
        wil_if_free(wil);

        return rc;
}

static void wil_pcie_remove(struct pci_dev *pdev)
{
        struct wil6210_priv *wil = pci_get_drvdata(pdev);
        void __iomem *csr = wil->csr;

        wil_dbg_misc(wil, "pcie_remove\n");

        unregister_pm_notifier(&wil->pm_notify);

        wil_pm_runtime_forbid(wil);

        wil6210_debugfs_remove(wil);
        rtnl_lock();
        wil_p2p_wdev_free(wil);
        wil_remove_all_additional_vifs(wil);
        rtnl_unlock();
        wil_if_remove(wil);
        wil_if_pcie_disable(wil);
        pci_iounmap(pdev, csr);
        pci_release_region(pdev, 0);
        pci_disable_device(pdev);
        wil_platform_ops_uninit(wil);
        wil_if_free(wil);
}

static const struct pci_device_id wil6210_pcie_ids[] = {
        { PCI_DEVICE(0x1ae9, 0x0310) },
        { PCI_DEVICE(0x1ae9, 0x0302) }, /* same as above, firmware broken */
        { PCI_DEVICE(0x17cb, 0x1201) }, /* Talyn */
        { /* end: all zeroes */ },
};
MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);

static int wil6210_suspend(struct device *dev, bool is_runtime)
{
        int rc = 0;
        struct pci_dev *pdev = to_pci_dev(dev);
        struct wil6210_priv *wil = pci_get_drvdata(pdev);
        bool keep_radio_on, active_ifaces;

        wil_dbg_pm(wil, "suspend: %s\n", is_runtime ? "runtime" : "system");

        mutex_lock(&wil->vif_mutex);
        active_ifaces = wil_has_active_ifaces(wil, true, false);
        mutex_unlock(&wil->vif_mutex);
        keep_radio_on = active_ifaces && wil->keep_radio_on_during_sleep;

        rc = wil_can_suspend(wil, is_runtime);
        if (rc)
                goto out;

        rc = wil_suspend(wil, is_runtime, keep_radio_on);
        if (!rc) {
                /* In case radio stays on, platform device will control
                 * PCIe master
                 */
                if (!keep_radio_on) {
                        /* disable bus mastering */
                        pci_clear_master(pdev);
                        wil->suspend_stats.r_off.successful_suspends++;
                } else {
                        wil->suspend_stats.r_on.successful_suspends++;
                }
        }
out:
        return rc;
}

static int wil6210_resume(struct device *dev, bool is_runtime)
{
        int rc = 0;
        struct pci_dev *pdev = to_pci_dev(dev);
        struct wil6210_priv *wil = pci_get_drvdata(pdev);
        bool keep_radio_on, active_ifaces;

        wil_dbg_pm(wil, "resume: %s\n", is_runtime ? "runtime" : "system");

        mutex_lock(&wil->vif_mutex);
        active_ifaces = wil_has_active_ifaces(wil, true, false);
        mutex_unlock(&wil->vif_mutex);
        keep_radio_on = active_ifaces && wil->keep_radio_on_during_sleep;

        /* In case radio stays on, platform device will control
         * PCIe master
         */
        if (!keep_radio_on)
                /* allow master */
                pci_set_master(pdev);
        rc = wil_resume(wil, is_runtime, keep_radio_on);
        if (rc) {
                wil_err(wil, "device failed to resume (%d)\n", rc);
                if (!keep_radio_on) {
                        pci_clear_master(pdev);
                        wil->suspend_stats.r_off.failed_resumes++;
                } else {
                        wil->suspend_stats.r_on.failed_resumes++;
                }
        } else {
                if (keep_radio_on)
                        wil->suspend_stats.r_on.successful_resumes++;
                else
                        wil->suspend_stats.r_off.successful_resumes++;
        }

        return rc;
}

static int wil6210_pm_notify(struct notifier_block *notify_block,
                             unsigned long mode, void *unused)
{
        struct wil6210_priv *wil = container_of(
                notify_block, struct wil6210_priv, pm_notify);
        int rc = 0;
        enum wil_platform_event evt;

        wil_dbg_pm(wil, "pm_notify: mode (%ld)\n", mode);

        switch (mode) {
        case PM_HIBERNATION_PREPARE:
        case PM_SUSPEND_PREPARE:
        case PM_RESTORE_PREPARE:
                rc = wil_can_suspend(wil, false);
                if (rc)
                        break;
                evt = WIL_PLATFORM_EVT_PRE_SUSPEND;
                if (wil->platform_ops.notify)
                        rc = wil->platform_ops.notify(wil->platform_handle,
                                                      evt);
                break;
        case PM_POST_SUSPEND:
        case PM_POST_HIBERNATION:
        case PM_POST_RESTORE:
                evt = WIL_PLATFORM_EVT_POST_SUSPEND;
                if (wil->platform_ops.notify)
                        rc = wil->platform_ops.notify(wil->platform_handle,
                                                      evt);
                break;
        default:
                wil_dbg_pm(wil, "unhandled notify mode %ld\n", mode);
                break;
        }

        wil_dbg_pm(wil, "notification mode %ld: rc (%d)\n", mode, rc);
        return rc;
}

static int __maybe_unused wil6210_pm_suspend(struct device *dev)
{
        return wil6210_suspend(dev, false);
}

static int __maybe_unused wil6210_pm_resume(struct device *dev)
{
        return wil6210_resume(dev, false);
}

static int __maybe_unused wil6210_pm_runtime_idle(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct wil6210_priv *wil = pci_get_drvdata(pdev);

        wil_dbg_pm(wil, "Runtime idle\n");

        return wil_can_suspend(wil, true);
}

static int __maybe_unused wil6210_pm_runtime_resume(struct device *dev)
{
        return wil6210_resume(dev, true);
}

static int __maybe_unused wil6210_pm_runtime_suspend(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct wil6210_priv *wil = pci_get_drvdata(pdev);

        if (test_bit(wil_status_suspended, wil->status)) {
                wil_dbg_pm(wil, "trying to suspend while suspended\n");
                return 1;
        }

        return wil6210_suspend(dev, true);
}

static const struct dev_pm_ops wil6210_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(wil6210_pm_suspend, wil6210_pm_resume)
        SET_RUNTIME_PM_OPS(wil6210_pm_runtime_suspend,
                           wil6210_pm_runtime_resume,
                           wil6210_pm_runtime_idle)
};

static struct pci_driver wil6210_driver = {
        .probe          = wil_pcie_probe,
        .remove         = wil_pcie_remove,
        .id_table       = wil6210_pcie_ids,
        .name           = WIL_NAME,
        .driver         = {
                .pm = &wil6210_pm_ops,
        },
};

static int __init wil6210_driver_init(void)
{
        int rc;

        rc = wil_platform_modinit();
        if (rc)
                return rc;

        rc = pci_register_driver(&wil6210_driver);
        if (rc)
                wil_platform_modexit();
        return rc;
}
module_init(wil6210_driver_init);

static void __exit wil6210_driver_exit(void)
{
        pci_unregister_driver(&wil6210_driver);
        wil_platform_modexit();
}
module_exit(wil6210_driver_exit);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");