pcie.c 50.6 KB
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/*
 * Marvell Wireless LAN device driver: PCIE specific handling
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include <linux/firmware.h>

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
#include "pcie.h"

#define PCIE_VERSION	"1.0"
#define DRV_NAME        "Marvell mwifiex PCIe"

static u8 user_rmmod;

static struct mwifiex_if_ops pcie_ops;

static struct semaphore add_remove_card_sem;
static int mwifiex_pcie_enable_host_int(struct mwifiex_adapter *adapter);
static int mwifiex_pcie_resume(struct pci_dev *pdev);

/*
 * This function is called after skb allocation to update
 * "skb->cb" with physical address of data pointer.
 */
static phys_addr_t *mwifiex_update_sk_buff_pa(struct sk_buff *skb)
{
	phys_addr_t *buf_pa = MWIFIEX_SKB_PACB(skb);

	*buf_pa = (phys_addr_t)virt_to_phys(skb->data);

	return buf_pa;
}

/*
 * This function reads sleep cookie and checks if FW is ready
 */
static bool mwifiex_pcie_ok_to_access_hw(struct mwifiex_adapter *adapter)
{
	u32 *cookie_addr;
	struct pcie_service_card *card = adapter->card;

	if (card->sleep_cookie) {
		cookie_addr = (u32 *)card->sleep_cookie->data;
		dev_dbg(adapter->dev, "info: ACCESS_HW: sleep cookie=0x%x\n",
			*cookie_addr);
		if (*cookie_addr == FW_AWAKE_COOKIE)
			return true;
	}

	return false;
}

/*
 * This function probes an mwifiex device and registers it. It allocates
 * the card structure, enables PCIE function number and initiates the
 * device registration and initialization procedure by adding a logical
 * interface.
 */
static int mwifiex_pcie_probe(struct pci_dev *pdev,
					const struct pci_device_id *ent)
{
	struct pcie_service_card *card;

	pr_debug("info: vendor=0x%4.04X device=0x%4.04X rev=%d\n",
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		 pdev->vendor, pdev->device, pdev->revision);
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	card = kzalloc(sizeof(struct pcie_service_card), GFP_KERNEL);
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	if (!card)
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		return -ENOMEM;

	card->dev = pdev;

	if (mwifiex_add_card(card, &add_remove_card_sem, &pcie_ops,
			     MWIFIEX_PCIE)) {
		pr_err("%s failed\n", __func__);
		kfree(card);
		return -1;
	}

	return 0;
}

/*
 * This function removes the interface and frees up the card structure.
 */
static void mwifiex_pcie_remove(struct pci_dev *pdev)
{
	struct pcie_service_card *card;
	struct mwifiex_adapter *adapter;
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	struct mwifiex_private *priv;
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	int i;

	card = pci_get_drvdata(pdev);
	if (!card)
		return;

	adapter = card->adapter;
	if (!adapter || !adapter->priv_num)
		return;

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	/* In case driver is removed when asynchronous FW load is in progress */
	wait_for_completion(&adapter->fw_load);

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	if (user_rmmod) {
#ifdef CONFIG_PM
		if (adapter->is_suspended)
			mwifiex_pcie_resume(pdev);
#endif

		for (i = 0; i < adapter->priv_num; i++)
			if ((GET_BSS_ROLE(adapter->priv[i]) ==
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			     MWIFIEX_BSS_ROLE_STA) &&
			    adapter->priv[i]->media_connected)
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				mwifiex_deauthenticate(adapter->priv[i], NULL);

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		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
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		mwifiex_disable_auto_ds(priv);

		mwifiex_init_shutdown_fw(priv, MWIFIEX_FUNC_SHUTDOWN);
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	}

	mwifiex_remove_card(card->adapter, &add_remove_card_sem);
	kfree(card);
}

/*
 * Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not suspended, this function allocates and sends a host
 * sleep activate request to the firmware and turns off the traffic.
 */
static int mwifiex_pcie_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct mwifiex_adapter *adapter;
	struct pcie_service_card *card;
	int hs_actived, i;

	if (pdev) {
		card = (struct pcie_service_card *) pci_get_drvdata(pdev);
		if (!card || card->adapter) {
			pr_err("Card or adapter structure is not valid\n");
			return 0;
		}
	} else {
		pr_err("PCIE device is not specified\n");
		return 0;
	}

	adapter = card->adapter;

	hs_actived = mwifiex_enable_hs(adapter);

	/* Indicate device suspended */
	adapter->is_suspended = true;

	for (i = 0; i < adapter->priv_num; i++)
		netif_carrier_off(adapter->priv[i]->netdev);

	return 0;
}

/*
 * Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not resumed, this function turns on the traffic and
 * sends a host sleep cancel request to the firmware.
 */
static int mwifiex_pcie_resume(struct pci_dev *pdev)
{
	struct mwifiex_adapter *adapter;
	struct pcie_service_card *card;
	int i;

	if (pdev) {
		card = (struct pcie_service_card *) pci_get_drvdata(pdev);
		if (!card || !card->adapter) {
			pr_err("Card or adapter structure is not valid\n");
			return 0;
		}
	} else {
		pr_err("PCIE device is not specified\n");
		return 0;
	}

	adapter = card->adapter;

	if (!adapter->is_suspended) {
		dev_warn(adapter->dev, "Device already resumed\n");
		return 0;
	}

	adapter->is_suspended = false;

	for (i = 0; i < adapter->priv_num; i++)
		if (adapter->priv[i]->media_connected)
			netif_carrier_on(adapter->priv[i]->netdev);

	mwifiex_cancel_hs(mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
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			  MWIFIEX_ASYNC_CMD);
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	return 0;
}

#define PCIE_VENDOR_ID_MARVELL              (0x11ab)
#define PCIE_DEVICE_ID_MARVELL_88W8766P		(0x2b30)

static DEFINE_PCI_DEVICE_TABLE(mwifiex_ids) = {
	{
		PCIE_VENDOR_ID_MARVELL, PCIE_DEVICE_ID_MARVELL_88W8766P,
		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	},
	{},
};

MODULE_DEVICE_TABLE(pci, mwifiex_ids);

/* PCI Device Driver */
static struct pci_driver __refdata mwifiex_pcie = {
	.name     = "mwifiex_pcie",
	.id_table = mwifiex_ids,
	.probe    = mwifiex_pcie_probe,
	.remove   = mwifiex_pcie_remove,
#ifdef CONFIG_PM
	/* Power Management Hooks */
	.suspend  = mwifiex_pcie_suspend,
	.resume   = mwifiex_pcie_resume,
#endif
};

/*
 * This function writes data into PCIE card register.
 */
static int mwifiex_write_reg(struct mwifiex_adapter *adapter, int reg, u32 data)
{
	struct pcie_service_card *card = adapter->card;

	iowrite32(data, card->pci_mmap1 + reg);

	return 0;
}

/*
 * This function reads data from PCIE card register.
 */
static int mwifiex_read_reg(struct mwifiex_adapter *adapter, int reg, u32 *data)
{
	struct pcie_service_card *card = adapter->card;

	*data = ioread32(card->pci_mmap1 + reg);

	return 0;
}

/*
 * This function wakes up the card.
 *
 * A host power up command is written to the card configuration
 * register to wake up the card.
 */
static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
{
	int i = 0;

	while (mwifiex_pcie_ok_to_access_hw(adapter)) {
		i++;
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		usleep_range(10, 20);
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		/* 50ms max wait */
		if (i == 50000)
			break;
	}

	dev_dbg(adapter->dev, "event: Wakeup device...\n");

	/* Enable interrupts or any chip access will wakeup device */
	if (mwifiex_write_reg(adapter, PCIE_HOST_INT_MASK, HOST_INTR_MASK)) {
		dev_warn(adapter->dev, "Enable host interrupt failed\n");
		return -1;
	}

	dev_dbg(adapter->dev, "PCIE wakeup: Setting PS_STATE_AWAKE\n");
	adapter->ps_state = PS_STATE_AWAKE;

	return 0;
}

/*
 * This function is called after the card has woken up.
 *
 * The card configuration register is reset.
 */
static int mwifiex_pm_wakeup_card_complete(struct mwifiex_adapter *adapter)
{
	dev_dbg(adapter->dev, "cmd: Wakeup device completed\n");

	return 0;
}

/*
 * This function disables the host interrupt.
 *
 * The host interrupt mask is read, the disable bit is reset and
 * written back to the card host interrupt mask register.
 */
static int mwifiex_pcie_disable_host_int(struct mwifiex_adapter *adapter)
{
	if (mwifiex_pcie_ok_to_access_hw(adapter)) {
		if (mwifiex_write_reg(adapter, PCIE_HOST_INT_MASK,
				      0x00000000)) {
			dev_warn(adapter->dev, "Disable host interrupt failed\n");
			return -1;
		}
	}

	return 0;
}

/*
 * This function enables the host interrupt.
 *
 * The host interrupt enable mask is written to the card
 * host interrupt mask register.
 */
static int mwifiex_pcie_enable_host_int(struct mwifiex_adapter *adapter)
{
	if (mwifiex_pcie_ok_to_access_hw(adapter)) {
		/* Simply write the mask to the register */
		if (mwifiex_write_reg(adapter, PCIE_HOST_INT_MASK,
				      HOST_INTR_MASK)) {
			dev_warn(adapter->dev, "Enable host interrupt failed\n");
			return -1;
		}
	}

	return 0;
}

/*
 * This function creates buffer descriptor ring for TX
 */
static int mwifiex_pcie_create_txbd_ring(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	struct sk_buff *skb;
	int i;
	phys_addr_t *buf_pa;

	/*
	 * driver maintaines the write pointer and firmware maintaines the read
	 * pointer. The write pointer starts at 0 (zero) while the read pointer
	 * starts at zero with rollover bit set
	 */
	card->txbd_wrptr = 0;
	card->txbd_rdptr |= MWIFIEX_BD_FLAG_ROLLOVER_IND;

	/* allocate shared memory for the BD ring and divide the same in to
	   several descriptors */
	card->txbd_ring_size = sizeof(struct mwifiex_pcie_buf_desc) *
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							MWIFIEX_MAX_TXRX_BD;
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	dev_dbg(adapter->dev, "info: txbd_ring: Allocating %d bytes\n",
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		card->txbd_ring_size);
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	card->txbd_ring_vbase = kzalloc(card->txbd_ring_size, GFP_KERNEL);
	if (!card->txbd_ring_vbase) {
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		dev_err(adapter->dev, "Unable to alloc buffer for txbd ring\n");
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		return -ENOMEM;
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	}
	card->txbd_ring_pbase = virt_to_phys(card->txbd_ring_vbase);

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	dev_dbg(adapter->dev,
		"info: txbd_ring - base: %p, pbase: %#x:%x, len: %x\n",
		card->txbd_ring_vbase, (u32)card->txbd_ring_pbase,
		(u32)((u64)card->txbd_ring_pbase >> 32), card->txbd_ring_size);
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	for (i = 0; i < MWIFIEX_MAX_TXRX_BD; i++) {
		card->txbd_ring[i] = (struct mwifiex_pcie_buf_desc *)
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				     (card->txbd_ring_vbase +
				      (sizeof(struct mwifiex_pcie_buf_desc)
				       * i));
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		/* Allocate buffer here so that firmware can DMA data from it */
		skb = dev_alloc_skb(MWIFIEX_RX_DATA_BUF_SIZE);
		if (!skb) {
			dev_err(adapter->dev, "Unable to allocate skb for TX ring.\n");
			kfree(card->txbd_ring_vbase);
			return -ENOMEM;
		}
		buf_pa = mwifiex_update_sk_buff_pa(skb);

		skb_put(skb, MWIFIEX_RX_DATA_BUF_SIZE);
		dev_dbg(adapter->dev, "info: TX ring: add new skb base: %p, "
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			"buf_base: %p, buf_pbase: %#x:%x, buf_len: %#x\n",
			skb, skb->data, (u32)*buf_pa,
			(u32)(((u64)*buf_pa >> 32)), skb->len);
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		card->tx_buf_list[i] = skb;
		card->txbd_ring[i]->paddr = *buf_pa;
		card->txbd_ring[i]->len = (u16)skb->len;
		card->txbd_ring[i]->flags = 0;
	}

	return 0;
}

static int mwifiex_pcie_delete_txbd_ring(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	int i;

	for (i = 0; i < MWIFIEX_MAX_TXRX_BD; i++) {
		if (card->tx_buf_list[i])
			dev_kfree_skb_any(card->tx_buf_list[i]);
		card->tx_buf_list[i] = NULL;
		card->txbd_ring[i]->paddr = 0;
		card->txbd_ring[i]->len = 0;
		card->txbd_ring[i]->flags = 0;
		card->txbd_ring[i] = NULL;
	}

	kfree(card->txbd_ring_vbase);
	card->txbd_ring_size = 0;
	card->txbd_wrptr = 0;
	card->txbd_rdptr = 0 | MWIFIEX_BD_FLAG_ROLLOVER_IND;
	card->txbd_ring_vbase = NULL;

	return 0;
}

/*
 * This function creates buffer descriptor ring for RX
 */
static int mwifiex_pcie_create_rxbd_ring(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	struct sk_buff *skb;
	int i;
	phys_addr_t *buf_pa;

	/*
	 * driver maintaines the read pointer and firmware maintaines the write
	 * pointer. The write pointer starts at 0 (zero) while the read pointer
	 * starts at zero with rollover bit set
	 */
	card->rxbd_wrptr = 0;
	card->rxbd_rdptr |= MWIFIEX_BD_FLAG_ROLLOVER_IND;

	card->rxbd_ring_size = sizeof(struct mwifiex_pcie_buf_desc) *
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							MWIFIEX_MAX_TXRX_BD;
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	dev_dbg(adapter->dev, "info: rxbd_ring: Allocating %d bytes\n",
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		card->rxbd_ring_size);
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	card->rxbd_ring_vbase = kzalloc(card->rxbd_ring_size, GFP_KERNEL);
	if (!card->rxbd_ring_vbase) {
		dev_err(adapter->dev, "Unable to allocate buffer for "
				"rxbd_ring.\n");
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		return -ENOMEM;
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	}
	card->rxbd_ring_pbase = virt_to_phys(card->rxbd_ring_vbase);

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	dev_dbg(adapter->dev,
		"info: rxbd_ring - base: %p, pbase: %#x:%x, len: %#x\n",
		card->rxbd_ring_vbase, (u32)card->rxbd_ring_pbase,
		(u32)((u64)card->rxbd_ring_pbase >> 32),
		card->rxbd_ring_size);
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	for (i = 0; i < MWIFIEX_MAX_TXRX_BD; i++) {
		card->rxbd_ring[i] = (struct mwifiex_pcie_buf_desc *)
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				     (card->rxbd_ring_vbase +
				      (sizeof(struct mwifiex_pcie_buf_desc)
				       * i));
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		/* Allocate skb here so that firmware can DMA data from it */
		skb = dev_alloc_skb(MWIFIEX_RX_DATA_BUF_SIZE);
		if (!skb) {
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			dev_err(adapter->dev,
				"Unable to allocate skb for RX ring.\n");
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			kfree(card->rxbd_ring_vbase);
			return -ENOMEM;
		}
		buf_pa = mwifiex_update_sk_buff_pa(skb);
		skb_put(skb, MWIFIEX_RX_DATA_BUF_SIZE);

		dev_dbg(adapter->dev, "info: RX ring: add new skb base: %p, "
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			"buf_base: %p, buf_pbase: %#x:%x, buf_len: %#x\n",
			skb, skb->data, (u32)*buf_pa, (u32)((u64)*buf_pa >> 32),
			skb->len);
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		card->rx_buf_list[i] = skb;
		card->rxbd_ring[i]->paddr = *buf_pa;
		card->rxbd_ring[i]->len = (u16)skb->len;
		card->rxbd_ring[i]->flags = 0;
	}

	return 0;
}

/*
 * This function deletes Buffer descriptor ring for RX
 */
static int mwifiex_pcie_delete_rxbd_ring(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	int i;

	for (i = 0; i < MWIFIEX_MAX_TXRX_BD; i++) {
		if (card->rx_buf_list[i])
			dev_kfree_skb_any(card->rx_buf_list[i]);
		card->rx_buf_list[i] = NULL;
		card->rxbd_ring[i]->paddr = 0;
		card->rxbd_ring[i]->len = 0;
		card->rxbd_ring[i]->flags = 0;
		card->rxbd_ring[i] = NULL;
	}

	kfree(card->rxbd_ring_vbase);
	card->rxbd_ring_size = 0;
	card->rxbd_wrptr = 0;
	card->rxbd_rdptr = 0 | MWIFIEX_BD_FLAG_ROLLOVER_IND;
	card->rxbd_ring_vbase = NULL;

	return 0;
}

/*
 * This function creates buffer descriptor ring for Events
 */
static int mwifiex_pcie_create_evtbd_ring(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	struct sk_buff *skb;
	int i;
	phys_addr_t *buf_pa;

	/*
	 * driver maintaines the read pointer and firmware maintaines the write
	 * pointer. The write pointer starts at 0 (zero) while the read pointer
	 * starts at zero with rollover bit set
	 */
	card->evtbd_wrptr = 0;
	card->evtbd_rdptr |= MWIFIEX_BD_FLAG_ROLLOVER_IND;

	card->evtbd_ring_size = sizeof(struct mwifiex_pcie_buf_desc) *
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							MWIFIEX_MAX_EVT_BD;
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	dev_dbg(adapter->dev, "info: evtbd_ring: Allocating %d bytes\n",
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		card->evtbd_ring_size);
569
570
	card->evtbd_ring_vbase = kzalloc(card->evtbd_ring_size, GFP_KERNEL);
	if (!card->evtbd_ring_vbase) {
571
572
		dev_err(adapter->dev,
			"Unable to allocate buffer. Terminating download\n");
573
		return -ENOMEM;
574
575
576
	}
	card->evtbd_ring_pbase = virt_to_phys(card->evtbd_ring_vbase);

577
578
579
580
581
	dev_dbg(adapter->dev,
		"info: CMDRSP/EVT bd_ring - base: %p pbase: %#x:%x len: %#x\n",
		card->evtbd_ring_vbase, (u32)card->evtbd_ring_pbase,
		(u32)((u64)card->evtbd_ring_pbase >> 32),
		card->evtbd_ring_size);
582
583
584

	for (i = 0; i < MWIFIEX_MAX_EVT_BD; i++) {
		card->evtbd_ring[i] = (struct mwifiex_pcie_buf_desc *)
585
586
587
				      (card->evtbd_ring_vbase +
				       (sizeof(struct mwifiex_pcie_buf_desc)
					* i));
588
589
590
591

		/* Allocate skb here so that firmware can DMA data from it */
		skb = dev_alloc_skb(MAX_EVENT_SIZE);
		if (!skb) {
592
593
			dev_err(adapter->dev,
				"Unable to allocate skb for EVENT buf.\n");
594
595
596
597
598
599
600
			kfree(card->evtbd_ring_vbase);
			return -ENOMEM;
		}
		buf_pa = mwifiex_update_sk_buff_pa(skb);
		skb_put(skb, MAX_EVENT_SIZE);

		dev_dbg(adapter->dev, "info: Evt ring: add new skb. base: %p, "
601
602
603
			"buf_base: %p, buf_pbase: %#x:%x, buf_len: %#x\n",
			skb, skb->data, (u32)*buf_pa, (u32)((u64)*buf_pa >> 32),
			skb->len);
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651

		card->evt_buf_list[i] = skb;
		card->evtbd_ring[i]->paddr = *buf_pa;
		card->evtbd_ring[i]->len = (u16)skb->len;
		card->evtbd_ring[i]->flags = 0;
	}

	return 0;
}

/*
 * This function deletes Buffer descriptor ring for Events
 */
static int mwifiex_pcie_delete_evtbd_ring(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	int i;

	for (i = 0; i < MWIFIEX_MAX_EVT_BD; i++) {
		if (card->evt_buf_list[i])
			dev_kfree_skb_any(card->evt_buf_list[i]);
		card->evt_buf_list[i] = NULL;
		card->evtbd_ring[i]->paddr = 0;
		card->evtbd_ring[i]->len = 0;
		card->evtbd_ring[i]->flags = 0;
		card->evtbd_ring[i] = NULL;
	}

	kfree(card->evtbd_ring_vbase);
	card->evtbd_wrptr = 0;
	card->evtbd_rdptr = 0 | MWIFIEX_BD_FLAG_ROLLOVER_IND;
	card->evtbd_ring_size = 0;
	card->evtbd_ring_vbase = NULL;

	return 0;
}

/*
 * This function allocates a buffer for CMDRSP
 */
static int mwifiex_pcie_alloc_cmdrsp_buf(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	struct sk_buff *skb;

	/* Allocate memory for receiving command response data */
	skb = dev_alloc_skb(MWIFIEX_UPLD_SIZE);
	if (!skb) {
652
653
		dev_err(adapter->dev,
			"Unable to allocate skb for command response data.\n");
654
655
656
657
658
659
660
661
662
663
		return -ENOMEM;
	}
	mwifiex_update_sk_buff_pa(skb);
	skb_put(skb, MWIFIEX_UPLD_SIZE);
	card->cmdrsp_buf = skb;

	skb = NULL;
	/* Allocate memory for sending command to firmware */
	skb = dev_alloc_skb(MWIFIEX_SIZE_OF_CMD_BUFFER);
	if (!skb) {
664
665
		dev_err(adapter->dev,
			"Unable to allocate skb for command data.\n");
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
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689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
		return -ENOMEM;
	}
	mwifiex_update_sk_buff_pa(skb);
	skb_put(skb, MWIFIEX_SIZE_OF_CMD_BUFFER);
	card->cmd_buf = skb;

	return 0;
}

/*
 * This function deletes a buffer for CMDRSP
 */
static int mwifiex_pcie_delete_cmdrsp_buf(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card;

	if (!adapter)
		return 0;

	card = adapter->card;

	if (card && card->cmdrsp_buf)
		dev_kfree_skb_any(card->cmdrsp_buf);

	if (card && card->cmd_buf)
		dev_kfree_skb_any(card->cmd_buf);

	return 0;
}

/*
 * This function allocates a buffer for sleep cookie
 */
static int mwifiex_pcie_alloc_sleep_cookie_buf(struct mwifiex_adapter *adapter)
{
	struct sk_buff *skb;
	struct pcie_service_card *card = adapter->card;

	/* Allocate memory for sleep cookie */
	skb = dev_alloc_skb(sizeof(u32));
	if (!skb) {
707
708
		dev_err(adapter->dev,
			"Unable to allocate skb for sleep cookie!\n");
709
710
711
712
713
714
715
716
717
		return -ENOMEM;
	}
	mwifiex_update_sk_buff_pa(skb);
	skb_put(skb, sizeof(u32));

	/* Init val of Sleep Cookie */
	*(u32 *)skb->data = FW_AWAKE_COOKIE;

	dev_dbg(adapter->dev, "alloc_scook: sleep cookie=0x%x\n",
718
		*((u32 *)skb->data));
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761

	/* Save the sleep cookie */
	card->sleep_cookie = skb;

	return 0;
}

/*
 * This function deletes buffer for sleep cookie
 */
static int mwifiex_pcie_delete_sleep_cookie_buf(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card;

	if (!adapter)
		return 0;

	card = adapter->card;

	if (card && card->sleep_cookie) {
		dev_kfree_skb_any(card->sleep_cookie);
		card->sleep_cookie = NULL;
	}

	return 0;
}

/*
 * This function sends data buffer to device
 */
static int
mwifiex_pcie_send_data(struct mwifiex_adapter *adapter, struct sk_buff *skb)
{
	struct pcie_service_card *card = adapter->card;
	u32 wrindx, rdptr;
	phys_addr_t *buf_pa;
	__le16 *tmp;

	if (!mwifiex_pcie_ok_to_access_hw(adapter))
		mwifiex_pm_wakeup_card(adapter);

	/* Read the TX ring read pointer set by firmware */
	if (mwifiex_read_reg(adapter, REG_TXBD_RDPTR, &rdptr)) {
762
763
		dev_err(adapter->dev,
			"SEND DATA: failed to read REG_TXBD_RDPTR\n");
764
765
766
767
768
769
		return -1;
	}

	wrindx = card->txbd_wrptr & MWIFIEX_TXBD_MASK;

	dev_dbg(adapter->dev, "info: SEND DATA: <Rd: %#x, Wr: %#x>\n", rdptr,
770
		card->txbd_wrptr);
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
	if (((card->txbd_wrptr & MWIFIEX_TXBD_MASK) !=
			(rdptr & MWIFIEX_TXBD_MASK)) ||
	    ((card->txbd_wrptr & MWIFIEX_BD_FLAG_ROLLOVER_IND) !=
			(rdptr & MWIFIEX_BD_FLAG_ROLLOVER_IND))) {
		struct sk_buff *skb_data;
		u8 *payload;

		adapter->data_sent = true;
		skb_data = card->tx_buf_list[wrindx];
		memcpy(skb_data->data, skb->data, skb->len);
		payload = skb_data->data;
		tmp = (__le16 *)&payload[0];
		*tmp = cpu_to_le16((u16)skb->len);
		tmp = (__le16 *)&payload[2];
		*tmp = cpu_to_le16(MWIFIEX_TYPE_DATA);
		skb_put(skb_data, MWIFIEX_RX_DATA_BUF_SIZE - skb_data->len);
		skb_trim(skb_data, skb->len);
		buf_pa = MWIFIEX_SKB_PACB(skb_data);
		card->txbd_ring[wrindx]->paddr = *buf_pa;
		card->txbd_ring[wrindx]->len = (u16)skb_data->len;
		card->txbd_ring[wrindx]->flags = MWIFIEX_BD_FLAG_FIRST_DESC |
						MWIFIEX_BD_FLAG_LAST_DESC;

		if ((++card->txbd_wrptr & MWIFIEX_TXBD_MASK) ==
							MWIFIEX_MAX_TXRX_BD)
			card->txbd_wrptr = ((card->txbd_wrptr &
						MWIFIEX_BD_FLAG_ROLLOVER_IND) ^
						MWIFIEX_BD_FLAG_ROLLOVER_IND);

		/* Write the TX ring write pointer in to REG_TXBD_WRPTR */
		if (mwifiex_write_reg(adapter, REG_TXBD_WRPTR,
802
803
804
				      card->txbd_wrptr)) {
			dev_err(adapter->dev,
				"SEND DATA: failed to write REG_TXBD_WRPTR\n");
805
806
807
808
809
810
			return 0;
		}

		/* Send the TX ready interrupt */
		if (mwifiex_write_reg(adapter, PCIE_CPU_INT_EVENT,
				      CPU_INTR_DNLD_RDY)) {
811
812
			dev_err(adapter->dev,
				"SEND DATA: failed to assert door-bell intr\n");
813
814
815
			return -1;
		}
		dev_dbg(adapter->dev, "info: SEND DATA: Updated <Rd: %#x, Wr: "
816
817
			"%#x> and sent packet to firmware successfully\n",
			rdptr, card->txbd_wrptr);
818
	} else {
819
820
		dev_dbg(adapter->dev,
			"info: TX Ring full, can't send packets to fw\n");
821
822
823
824
		adapter->data_sent = true;
		/* Send the TX ready interrupt */
		if (mwifiex_write_reg(adapter, PCIE_CPU_INT_EVENT,
				      CPU_INTR_DNLD_RDY))
825
826
			dev_err(adapter->dev,
				"SEND DATA: failed to assert door-bell intr\n");
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
		return -EBUSY;
	}

	return 0;
}

/*
 * This function handles received buffer ring and
 * dispatches packets to upper
 */
static int mwifiex_pcie_process_recv_data(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	u32 wrptr, rd_index;
	int ret = 0;
	struct sk_buff *skb_tmp = NULL;

	/* Read the RX ring Write pointer set by firmware */
	if (mwifiex_read_reg(adapter, REG_RXBD_WRPTR, &wrptr)) {
846
847
		dev_err(adapter->dev,
			"RECV DATA: failed to read REG_TXBD_RDPTR\n");
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
		ret = -1;
		goto done;
	}

	while (((wrptr & MWIFIEX_RXBD_MASK) !=
		(card->rxbd_rdptr & MWIFIEX_RXBD_MASK)) ||
	       ((wrptr & MWIFIEX_BD_FLAG_ROLLOVER_IND) ==
		(card->rxbd_rdptr & MWIFIEX_BD_FLAG_ROLLOVER_IND))) {
		struct sk_buff *skb_data;
		u16 rx_len;

		rd_index = card->rxbd_rdptr & MWIFIEX_RXBD_MASK;
		skb_data = card->rx_buf_list[rd_index];

		/* Get data length from interface header -
		   first byte is len, second byte is type */
		rx_len = *((u16 *)skb_data->data);
865
866
867
		dev_dbg(adapter->dev,
			"info: RECV DATA: Rd=%#x, Wr=%#x, Len=%d\n",
			card->rxbd_rdptr, wrptr, rx_len);
868
869
		skb_tmp = dev_alloc_skb(rx_len);
		if (!skb_tmp) {
870
871
			dev_dbg(adapter->dev,
				"info: Failed to alloc skb for RX\n");
872
873
874
875
876
877
878
879
880
881
882
883
884
885
			ret = -EBUSY;
			goto done;
		}

		skb_put(skb_tmp, rx_len);

		memcpy(skb_tmp->data, skb_data->data + INTF_HEADER_LEN, rx_len);
		if ((++card->rxbd_rdptr & MWIFIEX_RXBD_MASK) ==
							MWIFIEX_MAX_TXRX_BD) {
			card->rxbd_rdptr = ((card->rxbd_rdptr &
					     MWIFIEX_BD_FLAG_ROLLOVER_IND) ^
					    MWIFIEX_BD_FLAG_ROLLOVER_IND);
		}
		dev_dbg(adapter->dev, "info: RECV DATA: <Rd: %#x, Wr: %#x>\n",
886
			card->rxbd_rdptr, wrptr);
887
888
889
890

		/* Write the RX ring read pointer in to REG_RXBD_RDPTR */
		if (mwifiex_write_reg(adapter, REG_RXBD_RDPTR,
				      card->rxbd_rdptr)) {
891
892
			dev_err(adapter->dev,
				"RECV DATA: failed to write REG_RXBD_RDPTR\n");
893
894
895
896
897
898
			ret = -1;
			goto done;
		}

		/* Read the RX ring Write pointer set by firmware */
		if (mwifiex_read_reg(adapter, REG_RXBD_WRPTR, &wrptr)) {
899
900
			dev_err(adapter->dev,
				"RECV DATA: failed to read REG_TXBD_RDPTR\n");
901
902
903
			ret = -1;
			goto done;
		}
904
905
		dev_dbg(adapter->dev,
			"info: RECV DATA: Rcvd packet from fw successfully\n");
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
		mwifiex_handle_rx_packet(adapter, skb_tmp);
	}

done:
	if (ret && skb_tmp)
		dev_kfree_skb_any(skb_tmp);
	return ret;
}

/*
 * This function downloads the boot command to device
 */
static int
mwifiex_pcie_send_boot_cmd(struct mwifiex_adapter *adapter, struct sk_buff *skb)
{
	phys_addr_t *buf_pa = MWIFIEX_SKB_PACB(skb);

	if (!(skb->data && skb->len && *buf_pa)) {
924
925
926
927
		dev_err(adapter->dev,
			"Invalid parameter in %s <%p, %#x:%x, %x>\n",
			__func__, skb->data, skb->len,
			(u32)*buf_pa, (u32)((u64)*buf_pa >> 32));
928
929
930
931
932
933
		return -1;
	}

	/* Write the lower 32bits of the physical address to scratch
	 * register 0 */
	if (mwifiex_write_reg(adapter, PCIE_SCRATCH_0_REG, (u32)*buf_pa)) {
934
935
936
		dev_err(adapter->dev,
			"%s: failed to write download command to boot code.\n",
			__func__);
937
938
939
940
941
942
943
		return -1;
	}

	/* Write the upper 32bits of the physical address to scratch
	 * register 1 */
	if (mwifiex_write_reg(adapter, PCIE_SCRATCH_1_REG,
			      (u32)((u64)*buf_pa >> 32))) {
944
945
946
		dev_err(adapter->dev,
			"%s: failed to write download command to boot code.\n",
			__func__);
947
948
949
950
951
		return -1;
	}

	/* Write the command length to scratch register 2 */
	if (mwifiex_write_reg(adapter, PCIE_SCRATCH_2_REG, skb->len)) {
952
953
954
		dev_err(adapter->dev,
			"%s: failed to write command len to scratch reg 2\n",
			__func__);
955
956
957
958
959
960
		return -1;
	}

	/* Ring the door bell */
	if (mwifiex_write_reg(adapter, PCIE_CPU_INT_EVENT,
			      CPU_INTR_DOOR_BELL)) {
961
962
		dev_err(adapter->dev,
			"%s: failed to assert door-bell intr\n", __func__);
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
		return -1;
	}

	return 0;
}

/*
 * This function downloads commands to the device
 */
static int
mwifiex_pcie_send_cmd(struct mwifiex_adapter *adapter, struct sk_buff *skb)
{
	struct pcie_service_card *card = adapter->card;
	int ret = 0;
	phys_addr_t *cmd_buf_pa;
	phys_addr_t *cmdrsp_buf_pa;

	if (!(skb->data && skb->len)) {
		dev_err(adapter->dev, "Invalid parameter in %s <%p, %#x>\n",
982
			__func__, skb->data, skb->len);
983
984
985
986
987
		return -1;
	}

	/* Make sure a command response buffer is available */
	if (!card->cmdrsp_buf) {
988
989
		dev_err(adapter->dev,
			"No response buffer available, send command failed\n");
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
		return -EBUSY;
	}

	/* Make sure a command buffer is available */
	if (!card->cmd_buf) {
		dev_err(adapter->dev, "Command buffer not available\n");
		return -EBUSY;
	}

	adapter->cmd_sent = true;
	/* Copy the given skb in to DMA accessable shared buffer */
	skb_put(card->cmd_buf, MWIFIEX_SIZE_OF_CMD_BUFFER - card->cmd_buf->len);
	skb_trim(card->cmd_buf, skb->len);
	memcpy(card->cmd_buf->data, skb->data, skb->len);

	/* To send a command, the driver will:
		1. Write the 64bit physical address of the data buffer to
		   SCRATCH1 + SCRATCH0
		2. Ring the door bell (i.e. set the door bell interrupt)

		In response to door bell interrupt, the firmware will perform
		the DMA of the command packet (first header to obtain the total
		length and then rest of the command).
	*/

	if (card->cmdrsp_buf) {
		cmdrsp_buf_pa = MWIFIEX_SKB_PACB(card->cmdrsp_buf);
		/* Write the lower 32bits of the cmdrsp buffer physical
		   address */
		if (mwifiex_write_reg(adapter, REG_CMDRSP_ADDR_LO,
1020
1021
1022
				      (u32)*cmdrsp_buf_pa)) {
			dev_err(adapter->dev,
				"Failed to write download cmd to boot code.\n");
1023
1024
1025
1026
1027
1028
			ret = -1;
			goto done;
		}
		/* Write the upper 32bits of the cmdrsp buffer physical
		   address */
		if (mwifiex_write_reg(adapter, REG_CMDRSP_ADDR_HI,
1029
1030
1031
				      (u32)((u64)*cmdrsp_buf_pa >> 32))) {
			dev_err(adapter->dev,
				"Failed to write download cmd to boot code.\n");
1032
1033
1034
1035
1036
1037
1038
			ret = -1;
			goto done;
		}
	}

	cmd_buf_pa = MWIFIEX_SKB_PACB(card->cmd_buf);
	/* Write the lower 32bits of the physical address to REG_CMD_ADDR_LO */
1039
1040
1041
	if (mwifiex_write_reg(adapter, REG_CMD_ADDR_LO, (u32)*cmd_buf_pa)) {
		dev_err(adapter->dev,
			"Failed to write download cmd to boot code.\n");
1042
1043
1044
1045
1046
		ret = -1;
		goto done;
	}
	/* Write the upper 32bits of the physical address to REG_CMD_ADDR_HI */
	if (mwifiex_write_reg(adapter, REG_CMD_ADDR_HI,
1047
1048
1049
			      (u32)((u64)*cmd_buf_pa >> 32))) {
		dev_err(adapter->dev,
			"Failed to write download cmd to boot code.\n");
1050
1051
1052
1053
1054
		ret = -1;
		goto done;
	}

	/* Write the command length to REG_CMD_SIZE */
1055
1056
1057
	if (mwifiex_write_reg(adapter, REG_CMD_SIZE, card->cmd_buf->len)) {
		dev_err(adapter->dev,
			"Failed to write cmd len to REG_CMD_SIZE\n");
1058
1059
1060
1061
1062
1063
1064
		ret = -1;
		goto done;
	}

	/* Ring the door bell */
	if (mwifiex_write_reg(adapter, PCIE_CPU_INT_EVENT,
			      CPU_INTR_DOOR_BELL)) {
1065
1066
		dev_err(adapter->dev,
			"Failed to assert door-bell intr\n");
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
		ret = -1;
		goto done;
	}

done:
	if (ret)
		adapter->cmd_sent = false;

	return 0;
}

/*
 * This function handles command complete interrupt
 */
static int mwifiex_pcie_process_cmd_complete(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
1084
	struct sk_buff *skb = card->cmdrsp_buf;
1085
1086
1087
1088
1089
	int count = 0;

	dev_dbg(adapter->dev, "info: Rx CMD Response\n");

	if (!adapter->curr_cmd) {
1090
		skb_pull(skb, INTF_HEADER_LEN);
1091
		if (adapter->ps_state == PS_STATE_SLEEP_CFM) {
1092
1093
			mwifiex_process_sleep_confirm_resp(adapter, skb->data,
							   skb->len);
1094
1095
			while (mwifiex_pcie_ok_to_access_hw(adapter) &&
							(count++ < 10))
1096
				usleep_range(50, 60);
1097
		} else {
1098
1099
			dev_err(adapter->dev,
				"There is no command but got cmdrsp\n");
1100
		}
1101
1102
1103
		memcpy(adapter->upld_buf, skb->data,
		       min_t(u32, MWIFIEX_SIZE_OF_CMD_BUFFER, skb->len));
		skb_push(skb, INTF_HEADER_LEN);
1104
	} else if (mwifiex_pcie_ok_to_access_hw(adapter)) {
1105
1106
		skb_pull(skb, INTF_HEADER_LEN);
		adapter->curr_cmd->resp_skb = skb;
1107
1108
1109
1110
1111
1112
1113
1114
1115
		adapter->cmd_resp_received = true;
		/* Take the pointer and set it to CMD node and will
		   return in the response complete callback */
		card->cmdrsp_buf = NULL;

		/* Clear the cmd-rsp buffer address in scratch registers. This
		   will prevent firmware from writing to the same response
		   buffer again. */
		if (mwifiex_write_reg(adapter, REG_CMDRSP_ADDR_LO, 0)) {
1116
1117
			dev_err(adapter->dev,
				"cmd_done: failed to clear cmd_rsp_addr_lo\n");
1118
1119
1120
1121
1122
			return -1;
		}
		/* Write the upper 32bits of the cmdrsp buffer physical
		   address */
		if (mwifiex_write_reg(adapter, REG_CMDRSP_ADDR_HI, 0)) {
1123
1124
			dev_err(adapter->dev,
				"cmd_done: failed to clear cmd_rsp_addr_hi\n");
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
			return -1;
		}
	}

	return 0;
}

/*
 * Command Response processing complete handler
 */
static int mwifiex_pcie_cmdrsp_complete(struct mwifiex_adapter *adapter,
					struct sk_buff *skb)
{
	struct pcie_service_card *card = adapter->card;

	if (skb) {
		card->cmdrsp_buf = skb;
		skb_push(card->cmdrsp_buf, INTF_HEADER_LEN);
	}

	return 0;
}

/*
 * This function handles firmware event ready interrupt
 */
static int mwifiex_pcie_process_event_ready(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	u32 rdptr = card->evtbd_rdptr & MWIFIEX_EVTBD_MASK;
	u32 wrptr, event;

	if (adapter->event_received) {
1158
1159
		dev_dbg(adapter->dev, "info: Event being processed, "
			"do not process this interrupt just yet\n");
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
		return 0;
	}

	if (rdptr >= MWIFIEX_MAX_EVT_BD) {
		dev_dbg(adapter->dev, "info: Invalid read pointer...\n");
		return -1;
	}

	/* Read the event ring write pointer set by firmware */
	if (mwifiex_read_reg(adapter, REG_EVTBD_WRPTR, &wrptr)) {
1170
1171
		dev_err(adapter->dev,
			"EventReady: failed to read REG_EVTBD_WRPTR\n");
1172
1173
1174
1175
		return -1;
	}

	dev_dbg(adapter->dev, "info: EventReady: Initial <Rd: 0x%x, Wr: 0x%x>",
1176
1177
1178
		card->evtbd_rdptr, wrptr);
	if (((wrptr & MWIFIEX_EVTBD_MASK) != (card->evtbd_rdptr
					      & MWIFIEX_EVTBD_MASK)) ||
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
	    ((wrptr & MWIFIEX_BD_FLAG_ROLLOVER_IND) ==
	     (card->evtbd_rdptr & MWIFIEX_BD_FLAG_ROLLOVER_IND))) {
		struct sk_buff *skb_cmd;
		__le16 data_len = 0;
		u16 evt_len;

		dev_dbg(adapter->dev, "info: Read Index: %d\n", rdptr);
		skb_cmd = card->evt_buf_list[rdptr];
		/* Take the pointer and set it to event pointer in adapter
		   and will return back after event handling callback */
		card->evt_buf_list[rdptr] = NULL;
		card->evtbd_ring[rdptr]->paddr = 0;
		card->evtbd_ring[rdptr]->len = 0;
		card->evtbd_ring[rdptr]->flags = 0;

		event = *(u32 *) &skb_cmd->data[INTF_HEADER_LEN];
		adapter->event_cause = event;
		/* The first 4bytes will be the event transfer header
		   len is 2 bytes followed by type which is 2 bytes */
		memcpy(&data_len, skb_cmd->data, sizeof(__le16));
		evt_len = le16_to_cpu(data_len);

		skb_pull(skb_cmd, INTF_HEADER_LEN);
		dev_dbg(adapter->dev, "info: Event length: %d\n", evt_len);

		if ((evt_len > 0) && (evt_len  < MAX_EVENT_SIZE))
			memcpy(adapter->event_body, skb_cmd->data +
			       MWIFIEX_EVENT_HEADER_LEN, evt_len -
			       MWIFIEX_EVENT_HEADER_LEN);

		adapter->event_received = true;
		adapter->event_skb = skb_cmd;

		/* Do not update the event read pointer here, wait till the
		   buffer is released. This is just to make things simpler,
		   we need to find a better method of managing these buffers.
		*/
	}

	return 0;
}

/*
 * Event processing complete handler
 */
static int mwifiex_pcie_event_complete(struct mwifiex_adapter *adapter,
				       struct sk_buff *skb)
{
	struct pcie_service_card *card = adapter->card;
	int ret = 0;
	u32 rdptr = card->evtbd_rdptr & MWIFIEX_EVTBD_MASK;
	u32 wrptr;
	phys_addr_t *buf_pa;

	if (!skb)
		return 0;

1236
	if (rdptr >= MWIFIEX_MAX_EVT_BD) {
1237
		dev_err(adapter->dev, "event_complete: Invalid rdptr 0x%x\n",
1238
			rdptr);
1239
		return -EINVAL;
1240
	}
1241
1242
1243

	/* Read the event ring write pointer set by firmware */
	if (mwifiex_read_reg(adapter, REG_EVTBD_WRPTR, &wrptr)) {
1244
1245
		dev_err(adapter->dev,
			"event_complete: failed to read REG_EVTBD_WRPTR\n");
1246
		return -1;
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
	}

	if (!card->evt_buf_list[rdptr]) {
		skb_push(skb, INTF_HEADER_LEN);
		card->evt_buf_list[rdptr] = skb;
		buf_pa = MWIFIEX_SKB_PACB(skb);
		card->evtbd_ring[rdptr]->paddr = *buf_pa;
		card->evtbd_ring[rdptr]->len = (u16)skb->len;
		card->evtbd_ring[rdptr]->flags = 0;
		skb = NULL;
	} else {
1258
1259
1260
		dev_dbg(adapter->dev,
			"info: ERROR: buf still valid at index %d, <%p, %p>\n",
			rdptr, card->evt_buf_list[rdptr], skb);
1261
1262
1263
1264
1265
1266
1267
1268
1269
	}

	if ((++card->evtbd_rdptr & MWIFIEX_EVTBD_MASK) == MWIFIEX_MAX_EVT_BD) {
		card->evtbd_rdptr = ((card->evtbd_rdptr &
					MWIFIEX_BD_FLAG_ROLLOVER_IND) ^
					MWIFIEX_BD_FLAG_ROLLOVER_IND);
	}

	dev_dbg(adapter->dev, "info: Updated <Rd: 0x%x, Wr: 0x%x>",
1270
		card->evtbd_rdptr, wrptr);
1271
1272
1273

	/* Write the event ring read pointer in to REG_EVTBD_RDPTR */
	if (mwifiex_write_reg(adapter, REG_EVTBD_RDPTR, card->evtbd_rdptr)) {
1274
1275
		dev_err(adapter->dev,
			"event_complete: failed to read REG_EVTBD_RDPTR\n");
1276
		return -1;
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
	}

	dev_dbg(adapter->dev, "info: Check Events Again\n");
	ret = mwifiex_pcie_process_event_ready(adapter);

	return ret;
}

/*
 * This function downloads the firmware to the card.
 *
 * Firmware is downloaded to the card in blocks. Every block download
 * is tested for CRC errors, and retried a number of times before
 * returning failure.
 */
static int mwifiex_prog_fw_w_helper(struct mwifiex_adapter *adapter,
				    struct mwifiex_fw_image *fw)
{
	int ret;
	u8 *firmware = fw->fw_buf;
	u32 firmware_len = fw->fw_len;
	u32 offset = 0;
	struct sk_buff *skb;
	u32 txlen, tx_blocks = 0, tries, len;
	u32 block_retry_cnt = 0;

	if (!adapter) {
		pr_err("adapter structure is not valid\n");
		return -1;
	}

	if (!firmware || !firmware_len) {
1309
1310
		dev_err(adapter->dev,
			"No firmware image found! Terminating download\n");
1311
1312
1313
1314
		return -1;
	}

	dev_dbg(adapter->dev, "info: Downloading FW image (%d bytes)\n",
1315
		firmware_len);
1316
1317

	if (mwifiex_pcie_disable_host_int(adapter)) {
1318
1319
		dev_err(adapter->dev,
			"%s: Disabling interrupts failed.\n", __func__);
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
		return -1;
	}

	skb = dev_alloc_skb(MWIFIEX_UPLD_SIZE);
	if (!skb) {
		ret = -ENOMEM;
		goto done;
	}
	mwifiex_update_sk_buff_pa(skb);

	/* Perform firmware data transfer */
	do {
		u32 ireg_intr = 0;

		/* More data? */
		if (offset >= firmware_len)
			break;

		for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
			ret = mwifiex_read_reg(adapter, PCIE_SCRATCH_2_REG,
					       &len);
			if (ret) {
1342
1343
				dev_warn(adapter->dev,
					 "Failed reading len from boot code\n");
1344
1345
1346
1347
				goto done;
			}
			if (len)
				break;
1348
			usleep_range(10, 20);
1349
1350
1351
1352
1353
1354
		}

		if (!len) {
			break;
		} else if (len > MWIFIEX_UPLD_SIZE) {
			pr_err("FW download failure @ %d, invalid length %d\n",
1355
			       offset, len);
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
			ret = -1;
			goto done;
		}

		txlen = len;

		if (len & BIT(0)) {
			block_retry_cnt++;
			if (block_retry_cnt > MAX_WRITE_IOMEM_RETRY) {
				pr_err("FW download failure @ %d, over max "
				       "retry count\n", offset);
				ret = -1;
				goto done;
			}
			dev_err(adapter->dev, "FW CRC error indicated by the "
1371
1372
				"helper: len = 0x%04X, txlen = %d\n",
				len, txlen);
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
			len &= ~BIT(0);
			/* Setting this to 0 to resend from same offset */
			txlen = 0;
		} else {
			block_retry_cnt = 0;
			/* Set blocksize to transfer - checking for
			   last block */
			if (firmware_len - offset < txlen)
				txlen = firmware_len - offset;

			dev_dbg(adapter->dev, ".");

1385
1386
1387
			tx_blocks = (txlen +
				     MWIFIEX_PCIE_BLOCK_SIZE_FW_DNLD - 1) /
				     MWIFIEX_PCIE_BLOCK_SIZE_FW_DNLD;
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397

			/* Copy payload to buffer */
			memmove(skb->data, &firmware[offset], txlen);
		}

		skb_put(skb, MWIFIEX_UPLD_SIZE - skb->len);
		skb_trim(skb, tx_blocks * MWIFIEX_PCIE_BLOCK_SIZE_FW_DNLD);

		/* Send the boot command to device */
		if (mwifiex_pcie_send_boot_cmd(adapter, skb)) {
1398
1399
			dev_err(adapter->dev,
				"Failed to send firmware download command\n");
1400
1401
1402
1403
1404
1405
1406
1407
			ret = -1;
			goto done;
		}
		/* Wait for the command done interrupt */
		do {
			if (mwifiex_read_reg(adapter, PCIE_CPU_INT_STATUS,
					     &ireg_intr)) {
				dev_err(adapter->dev, "%s: Failed to read "
1408
1409
					"interrupt status during fw dnld.\n",
					__func__);
1410
1411
1412
1413
1414
1415
1416
1417
1418
				ret = -1;
				goto done;
			}
		} while ((ireg_intr & CPU_INTR_DOOR_BELL) ==
			 CPU_INTR_DOOR_BELL);
		offset += txlen;
	} while (true);

	dev_dbg(adapter->dev, "info:\nFW download over, size %d bytes\n",
1419
		offset);
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441

	ret = 0;

done:
	dev_kfree_skb_any(skb);
	return ret;
}

/*
 * This function checks the firmware status in card.
 *
 * The winner interface is also determined by this function.
 */
static int
mwifiex_check_fw_status(struct mwifiex_adapter *adapter, u32 poll_num)
{
	int ret = 0;
	u32 firmware_stat, winner_status;
	u32 tries;

	/* Mask spurios interrupts */
	if (mwifiex_write_reg(adapter, PCIE_HOST_INT_STATUS_MASK,
1442
			      HOST_INTR_MASK)) {
1443
1444
1445
1446
1447
1448
		dev_warn(adapter->dev, "Write register failed\n");
		return -1;
	}

	dev_dbg(adapter->dev, "Setting driver ready signature\n");
	if (mwifiex_write_reg(adapter, REG_DRV_READY, FIRMWARE_READY_PCIE)) {
1449
1450
		dev_err(adapter->dev,
			"Failed to write driver ready signature\n");
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
		return -1;
	}

	/* Wait for firmware initialization event */
	for (tries = 0; tries < poll_num; tries++) {
		if (mwifiex_read_reg(adapter, PCIE_SCRATCH_3_REG,
				     &firmware_stat))
			ret = -1;
		else
			ret = 0;
		if (ret)
			continue;
		if (firmware_stat == FIRMWARE_READY_PCIE) {
			ret = 0;
			break;
		} else {
			mdelay(100);
			ret = -1;
		}
	}

	if (ret) {
		if (mwifiex_read_reg(adapter, PCIE_SCRATCH_3_REG,
				     &winner_status))
			ret = -1;
		else if (!winner_status) {
			dev_err(adapter->dev, "PCI-E is the winner\n");
			adapter->winner = 1;
			ret = -1;
		} else {
1481
1482
1483
			dev_err(adapter->dev,
				"PCI-E is not the winner <%#x,%d>, exit dnld\n",
				ret, adapter->winner);
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
			ret = 0;
		}
	}

	return ret;
}

/*
 * This function reads the interrupt status from card.
 */
static void mwifiex_interrupt_status(struct mwifiex_adapter *adapter)
{
	u32 pcie_ireg;
	unsigned long flags;

	if (!mwifiex_pcie_ok_to_access_hw(adapter))
		return;

	if (mwifiex_read_reg(adapter, PCIE_HOST_INT_STATUS, &pcie_ireg)) {
		dev_warn(adapter->dev, "Read register failed\n");
		return;
	}

	if ((pcie_ireg != 0xFFFFFFFF) && (pcie_ireg)) {

		mwifiex_pcie_disable_host_int(adapter);

		/* Clear the pending interrupts */
		if (mwifiex_write_reg(adapter, PCIE_HOST_INT_STATUS,
				      ~pcie_ireg)) {
			dev_warn(adapter->dev, "Write register failed\n");
			return;
		}
		spin_lock_irqsave(&adapter->int_lock, flags);
		adapter->int_status |= pcie_ireg;
		spin_unlock_irqrestore(&adapter->int_lock, flags);

		if (pcie_ireg & HOST_INTR_CMD_DONE) {
			if ((adapter->ps_state == PS_STATE_SLEEP_CFM) ||
			    (adapter->ps_state == PS_STATE_SLEEP)) {
				mwifiex_pcie_enable_host_int(adapter);
				if (mwifiex_write_reg(adapter,
1526
1527
1528
1529
1530
						      PCIE_CPU_INT_EVENT,
						      CPU_INTR_SLEEP_CFM_DONE)
						      ) {
					dev_warn(adapter->dev,
						 "Write register failed\n");
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
					return;

				}
			}
		} else if (!adapter->pps_uapsd_mode &&
			   adapter->ps_state == PS_STATE_SLEEP) {
				/* Potentially for PCIe we could get other
				 * interrupts like shared. Don't change power
				 * state until cookie is set */
				if (mwifiex_pcie_ok_to_access_hw(adapter))
					adapter->ps_state = PS_STATE_AWAKE;
		}
	}
}

/*
 * Interrupt handler for PCIe root port
 *
 * This function reads the interrupt status from firmware and assigns
 * the main process in workqueue which will handle the interrupt.
 */
static irqreturn_t mwifiex_pcie_interrupt(int irq, void *context)
{
	struct pci_dev *pdev = (struct pci_dev *)context;
	struct pcie_service_card *card;
	struct mwifiex_adapter *adapter;

	if (!pdev) {
		pr_debug("info: %s: pdev is NULL\n", (u8 *)pdev);
		goto exit;
	}

	card = (struct pcie_service_card *) pci_get_drvdata(pdev);
	if (!card || !card->adapter) {
		pr_debug("info: %s: card=%p adapter=%p\n", __func__, card,
1566
			 card ? card->adapter : NULL);
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
		goto exit;
	}
	adapter = card->adapter;

	if (adapter->surprise_removed)
		goto exit;

	mwifiex_interrupt_status(adapter);
	queue_work(adapter->workqueue, &adapter->main_work);

exit:
	return IRQ_HANDLED;
}

/*
 * This function checks the current interrupt status.
 *
 * The following interrupts are checked and handled by this function -
 *      - Data sent
 *      - Command sent
 *      - Command received
 *      - Packets received
 *      - Events received
 *
 * In case of Rx packets received, the packets are uploaded from card to
 * host and processed accordingly.
 */
static int mwifiex_process_int_status(struct mwifiex_adapter *adapter)
{
	int ret;
1597
	u32 pcie_ireg;
1598
1599
1600
1601
	unsigned long flags;

	spin_lock_irqsave(&adapter->int_lock, flags);
	/* Clear out unused interrupts */
1602
1603
	pcie_ireg = adapter->int_status;
	adapter->int_status = 0;
1604
1605
	spin_unlock_irqrestore(&adapter->int_lock, flags);

1606
1607
1608
	while (pcie_ireg & HOST_INTR_MASK) {
		if (pcie_ireg & HOST_INTR_DNLD_DONE) {
			pcie_ireg &= ~HOST_INTR_DNLD_DONE;
1609
			if (adapter->data_sent) {
1610
				dev_dbg(adapter->dev, "info: DATA sent intr\n");
1611
1612
1613
				adapter->data_sent = false;
			}
		}
1614
1615
		if (pcie_ireg & HOST_INTR_UPLD_RDY) {
			pcie_ireg &= ~HOST_INTR_UPLD_RDY;
1616
1617
1618
1619
1620
			dev_dbg(adapter->dev, "info: Rx DATA\n");
			ret = mwifiex_pcie_process_recv_data(adapter);
			if (ret)
				return ret;
		}
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		if (pcie_ireg & HOST_INTR_EVENT_RDY) {
			pcie_ireg &= ~HOST_INTR_EVENT_RDY;
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			dev_dbg(adapter->dev, "info: Rx EVENT\n");
			ret = mwifiex_pcie_process_event_ready(adapter);
			if (ret)
				return ret;
		}

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		if (pcie_ireg & HOST_INTR_CMD_DONE) {
			pcie_ireg &= ~HOST_INTR_CMD_DONE;
1631
			if (adapter->cmd_sent) {
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				dev_dbg(adapter->dev,
					"info: CMD sent Interrupt\n");
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				adapter->cmd_sent = false;
			}
			/* Handle command response */
			ret = mwifiex_pcie_process_cmd_complete(adapter);
			if (ret)
				return ret;
		}

		if (mwifiex_pcie_ok_to_access_hw(adapter)) {
			if (mwifiex_read_reg(adapter, PCIE_HOST_INT_STATUS,
					     &pcie_ireg)) {
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				dev_warn(adapter->dev,
					 "Read register failed\n");
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				return -1;
			}

			if ((pcie_ireg != 0xFFFFFFFF) && (pcie_ireg)) {
				if (mwifiex_write_reg(adapter,
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						      PCIE_HOST_INT_STATUS,
						      ~pcie_ireg)) {
					dev_warn(adapter->dev,
						 "Write register failed\n");
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					return -1;
				}
			}

		}
	}
	dev_dbg(adapter->dev, "info: cmd_sent=%d data_sent=%d\n",
1663
		adapter->cmd_sent, adapter->data_sent);
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	mwifiex_pcie_enable_host_int(adapter);

	return 0;
}

/*
 * This function downloads data from driver to card.
 *
 * Both commands and data packets are transferred to the card by this
 * function.
 *
 * This function adds the PCIE specific header to the front of the buffer
 * before transferring. The header contains the length of the packet and
 * the type. The firmware handles the packets based upon this set type.
 */
static int mwifiex_pcie_host_to_card(struct mwifiex_adapter *adapter, u8 type,
				     struct sk_buff *skb,
				     struct mwifiex_tx_param *tx_param)
{
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	if (!skb) {
		dev_err(adapter->dev, "Passed NULL skb to %s\n", __func__);
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		return -1;
	}

	if (type == MWIFIEX_TYPE_DATA)
		return mwifiex_pcie_send_data(adapter, skb);
	else if (type == MWIFIEX_TYPE_CMD)
		return mwifiex_pcie_send_cmd(adapter, skb);

	return 0;
}

/*
 * This function initializes the PCI-E host memory space, WCB rings, etc.
 *
 * The following initializations steps are followed -
 *      - Allocate TXBD ring buffers
 *      - Allocate RXBD ring buffers
 *      - Allocate event BD ring buffers
 *      - Allocate command response ring buffer
 *      - Allocate sleep cookie buffer
 */
static int mwifiex_pcie_init(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	int ret;
	struct pci_dev *pdev = card->dev;

	pci_set_drvdata(pdev, card);

	ret = pci_enable_device(pdev);
	if (ret)
		goto err_enable_dev;

	pci_set_master(pdev);

	dev_dbg(adapter->dev, "try set_consistent_dma_mask(32)\n");
	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	if (ret) {
		dev_err(adapter->dev, "set_dma_mask(32) failed\n");
		goto err_set_dma_mask;
	}

	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
	if (ret) {
		dev_err(adapter->dev, "set_consistent_dma_mask(64) failed\n");
		goto err_set_dma_mask;
	}

	ret = pci_request_region(pdev, 0, DRV_NAME);
	if (ret) {
		dev_err(adapter->dev, "req_reg(0) error\n");
		goto err_req_region0;
	}
	card->pci_mmap = pci_iomap(pdev, 0, 0);
	if (!card->pci_mmap) {
		dev_err(adapter->dev, "iomap(0) error\n");
		goto err_iomap0;
	}
	ret = pci_request_region(pdev, 2, DRV_NAME);
	if (ret) {
		dev_err(adapter->dev, "req_reg(2) error\n");
		goto err_req_region2;
	}
	card->pci_mmap1 = pci_iomap(pdev, 2, 0);
	if (!card->pci_mmap1) {
		dev_err(adapter->dev, "iomap(2) error\n");
		goto err_iomap2;
	}

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	dev_dbg(adapter->dev,
		"PCI memory map Virt0: %p PCI memory map Virt2: %p\n",
		card->pci_mmap, card->pci_mmap1);
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	card->cmdrsp_buf = NULL;
	ret = mwifiex_pcie_create_txbd_ring(adapter);
	if (ret)
		goto err_cre_txbd;
	ret = mwifiex_pcie_create_rxbd_ring(adapter);
	if (ret)
		goto err_cre_rxbd;
	ret = mwifiex_pcie_create_evtbd_ring(adapter);
	if (ret)
		goto err_cre_evtbd;
	ret = mwifiex_pcie_alloc_cmdrsp_buf(adapter);
	if (ret)
		goto err_alloc_cmdbuf;
	ret = mwifiex_pcie_alloc_sleep_cookie_buf(adapter);
	if (ret)
		goto err_alloc_cookie;

	return ret;

err_alloc_cookie:
	mwifiex_pcie_delete_cmdrsp_buf(adapter);
err_alloc_cmdbuf:
	mwifiex_pcie_delete_evtbd_ring(adapter);
err_cre_evtbd:
	mwifiex_pcie_delete_rxbd_ring(adapter);
err_cre_rxbd:
	mwifiex_pcie_delete_txbd_ring(adapter);
err_cre_txbd:
	pci_iounmap(pdev, card->pci_mmap1);
err_iomap2:
	pci_release_region(pdev, 2);
err_req_region2:
	pci_iounmap(pdev, card->pci_mmap);
err_iomap0:
	pci_release_region(pdev, 0);
err_req_region0:
err_set_dma_mask:
	pci_disable_device(pdev);
err_enable_dev:
	pci_set_drvdata(pdev, NULL);
	return ret;
}

/*
 * This function cleans up the allocated card buffers.
 *
 * The following are freed by this function -
 *      - TXBD ring buffers
 *      - RXBD ring buffers
 *      - Event BD ring buffers
 *      - Command response ring buffer
 *      - Sleep cookie buffer
 */
static void mwifiex_pcie_cleanup(struct mwifiex_adapter *adapter)
{
	struct pcie_service_card *card = adapter->card;
	struct pci_dev *pdev = card->dev;

	mwifiex_pcie_delete_sleep_cookie_buf(adapter);
	mwifiex_pcie_delete_cmdrsp_buf(adapter);
	mwifiex_pcie_delete_evtbd_ring(adapter);
	mwifiex_pcie_delete_rxbd_ring(adapter);
	mwifiex_pcie_delete_txbd_ring(adapter);
	card->cmdrsp_buf = NULL;

	dev_dbg(adapter->dev, "Clearing driver ready signature\n");
	if (user_rmmod) {
		if (mwifiex_write_reg(adapter, REG_DRV_READY, 0x00000000))
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1827
			dev_err(adapter->dev,
				"Failed to write driver not-ready signature\n");
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