/*
 * Copyright (c) 2012-2014 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 "wil6210.h"

static int use_msi = 1;
module_param(use_msi, int, S_IRUGO);
MODULE_PARM_DESC(use_msi,
		 " Use MSI interrupt: "
		 "0 - don't, 1 - (default) - single, or 3");

static bool debug_fw; /* = false; */
module_param(debug_fw, bool, S_IRUGO);
MODULE_PARM_DESC(debug_fw, " load driver if FW not ready. For FW debug");

void wil_disable_irq(struct wil6210_priv *wil)
{
	int irq = wil->pdev->irq;

	disable_irq(irq);
	if (wil->n_msi == 3) {
		disable_irq(irq + 1);
		disable_irq(irq + 2);
	}
}

void wil_enable_irq(struct wil6210_priv *wil)
{
	int irq = wil->pdev->irq;

	enable_irq(irq);
	if (wil->n_msi == 3) {
		enable_irq(irq + 1);
		enable_irq(irq + 2);
	}
}

/* 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;

	wil_dbg_misc(wil, "%s()\n", __func__);

	pdev->msi_enabled = 0;

	pci_set_master(pdev);

	/*
	 * how many MSI interrupts to request?
	 */
	switch (use_msi) {
	case 3:
	case 1:
		wil_dbg_misc(wil, "Setup %d MSI interrupts\n", use_msi);
		break;
	case 0:
		wil_dbg_misc(wil, "MSI interrupts disabled, use INTx\n");
		break;
	default:
		wil_err(wil, "Invalid use_msi=%d, default to 1\n", use_msi);
		use_msi = 1;
	}

	if (use_msi == 3 && pci_enable_msi_range(pdev, 3, 3) < 0) {
		wil_err(wil, "3 MSI mode failed, try 1 MSI\n");
		use_msi = 1;
	}

	if (use_msi == 1 && pci_enable_msi(pdev)) {
		wil_err(wil, "pci_enable_msi failed, use INTx\n");
		use_msi = 0;
	}

	wil->n_msi = use_msi;

	if ((wil->n_msi == 0) && 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);
	if (rc)
		goto stop_master;

	/* need reset here to obtain MAC */
	mutex_lock(&wil->mutex);
	rc = wil_reset(wil);
	mutex_unlock(&wil->mutex);
	if (debug_fw)
		rc = 0;
	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, "%s()\n", __func__);

	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_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct wil6210_priv *wil;
	struct device *dev = &pdev->dev;
	void __iomem *csr;
	struct wil_board *board = (struct wil_board *)id->driver_data;
	int rc;

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

	if (pci_resource_len(pdev, 0) != WIL6210_MEM_SIZE) {
		dev_err(&pdev->dev, "Not " WIL_NAME "? "
			"BAR0 size is %lu while expecting %lu\n",
			(ulong)pci_resource_len(pdev, 0), WIL6210_MEM_SIZE);
		return -ENODEV;
	}

	rc = pci_enable_device(pdev);
	if (rc) {
		dev_err(&pdev->dev,
			"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)
		return -ENODEV;
	/* rollback to err_disable_pdev */

	rc = pci_request_region(pdev, 0, WIL_NAME);
	if (rc) {
		dev_err(&pdev->dev, "pci_request_region failed\n");
		goto err_disable_pdev;
	}
	/* rollback to err_release_reg */

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

	wil = wil_if_alloc(dev, csr);
	if (IS_ERR(wil)) {
		rc = (int)PTR_ERR(wil);
		dev_err(dev, "wil_if_alloc failed: %d\n", rc);
		goto err_iounmap;
	}
	/* rollback to if_free */

	pci_set_drvdata(pdev, wil);
	wil->pdev = pdev;
	wil->board = board;

	wil6210_clear_irq(wil);

	wil->platform_handle =
			wil_platform_init(&pdev->dev, &wil->platform_ops);

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

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

	wil6210_debugfs_init(wil);

	/* check FW is alive */
	wmi_echo(wil);

	return 0;

 bus_disable:
	wil_if_pcie_disable(wil);
 if_free:
	if (wil->platform_ops.uninit)
		wil->platform_ops.uninit(wil->platform_handle);
	wil_if_free(wil);
 err_iounmap:
	pci_iounmap(pdev, csr);
 err_release_reg:
	pci_release_region(pdev, 0);
 err_disable_pdev:
	pci_disable_device(pdev);

	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, "%s()\n", __func__);

	wil6210_debugfs_remove(wil);
	wil_if_remove(wil);
	wil_if_pcie_disable(wil);
	if (wil->platform_ops.uninit)
		wil->platform_ops.uninit(wil->platform_handle);
	wil_if_free(wil);
	pci_iounmap(pdev, csr);
	pci_release_region(pdev, 0);
	pci_disable_device(pdev);
}

static const struct wil_board wil_board_marlon = {
	.board = WIL_BOARD_MARLON,
	.name = "marlon",
};

static const struct wil_board wil_board_sparrow = {
	.board = WIL_BOARD_SPARROW,
	.name = "sparrow",
};

static const struct pci_device_id wil6210_pcie_ids[] = {
	{ PCI_DEVICE(0x1ae9, 0x0301),
	  .driver_data = (kernel_ulong_t)&wil_board_marlon },
	{ PCI_DEVICE(0x1ae9, 0x0310),
	  .driver_data = (kernel_ulong_t)&wil_board_sparrow },
	{ PCI_DEVICE(0x1ae9, 0x0302), /* same as above, firmware broken */
	  .driver_data = (kernel_ulong_t)&wil_board_sparrow },
	{ /* end: all zeroes */	},
};
MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);

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

module_pci_driver(wil6210_driver);

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