/*
 * Copyright (c) 2012-2017 Qualcomm Atheros, Inc.
 *
 * 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
void 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;

	bitmap_zero(wil->hw_capabilities, hw_capability_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:
		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;
			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;
		}
		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;
	}

	wil_info(wil, "Board hardware is %s\n", wil->hw_name);

	/* 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);
}

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);
}

/* 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;
	bool wmi_only = test_bit(WMI_FW_CAPABILITY_WMI_ONLY,
				 wil->fw_capabilities);

	wil_dbg_misc(wil, "if_pcie_enable, wmi_only %d\n", wmi_only);

	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 or in case of WMI-only FW, full reset
	 * and fw loading takes place
	 */
	mutex_lock(&wil->mutex);
	rc = wil_reset(wil, wmi_only);
	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);

	wil_set_capabilities(wil);
	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;
	}

	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;

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);
	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 */
	{ /* 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);
	struct net_device *ndev = wil_to_ndev(wil);
	bool keep_radio_on = ndev->flags & IFF_UP &&
			     wil->keep_radio_on_during_sleep;

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

	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);
	struct net_device *ndev = wil_to_ndev(wil);
	bool keep_radio_on = ndev->flags & IFF_UP &&
			     wil->keep_radio_on_during_sleep;

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

	/* 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");