// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
/* from src/prism2/download/prism2dl.c
 *
 * utility for downloading prism2 images moved into kernelspace
 *
 * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
 * --------------------------------------------------------------------
 *
 * linux-wlan
 *
 *   The contents of this file are subject to the Mozilla Public
 *   License Version 1.1 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.mozilla.org/MPL/
 *
 *   Software distributed under the License is distributed on an "AS
 *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *   implied. See the License for the specific language governing
 *   rights and limitations under the License.
 *
 *   Alternatively, the contents of this file may be used under the
 *   terms of the GNU Public License version 2 (the "GPL"), in which
 *   case the provisions of the GPL are applicable instead of the
 *   above.  If you wish to allow the use of your version of this file
 *   only under the terms of the GPL and not to allow others to use
 *   your version of this file under the MPL, indicate your decision
 *   by deleting the provisions above and replace them with the notice
 *   and other provisions required by the GPL.  If you do not delete
 *   the provisions above, a recipient may use your version of this
 *   file under either the MPL or the GPL.
 *
 * --------------------------------------------------------------------
 *
 * Inquiries regarding the linux-wlan Open Source project can be
 * made directly to:
 *
 * AbsoluteValue Systems Inc.
 * info@linux-wlan.com
 * http://www.linux-wlan.com
 *
 * --------------------------------------------------------------------
 *
 * Portions of the development of this software were funded by
 * Intersil Corporation as part of PRISM(R) chipset product development.
 *
 * --------------------------------------------------------------------
 */

/*================================================================*/
/* System Includes */
#include <linux/ihex.h>
#include <linux/slab.h>

/*================================================================*/
/* Local Constants */

#define PRISM2_USB_FWFILE       "prism2_ru.fw"
MODULE_FIRMWARE(PRISM2_USB_FWFILE);

#define S3DATA_MAX              5000
#define S3PLUG_MAX              200
#define S3CRC_MAX               200
#define S3INFO_MAX              50

#define S3ADDR_PLUG             (0xff000000UL)
#define S3ADDR_CRC              (0xff100000UL)
#define S3ADDR_INFO             (0xff200000UL)
#define S3ADDR_START            (0xff400000UL)

#define CHUNKS_MAX              100

#define WRITESIZE_MAX           4096

/*================================================================*/
/* Local Types */

struct s3datarec {
        u32 len;
        u32 addr;
        u8 checksum;
        u8 *data;
};

struct s3plugrec {
        u32 itemcode;
        u32 addr;
        u32 len;
};

struct s3crcrec {
        u32 addr;
        u32 len;
        unsigned int dowrite;
};

struct s3inforec {
        u16 len;
        u16 type;
        union {
                struct hfa384x_compident version;
                struct hfa384x_caplevel compat;
                u16 buildseq;
                struct hfa384x_compident platform;
        } info;
};

struct pda {
        u8 buf[HFA384x_PDA_LEN_MAX];
        struct hfa384x_pdrec *rec[HFA384x_PDA_RECS_MAX];
        unsigned int nrec;
};

struct imgchunk {
        u32 addr;       /* start address */
        u32 len;        /* in bytes */
        u16 crc;        /* CRC value (if it falls at a chunk boundary) */
        u8 *data;
};

/*================================================================*/
/* Local Static Definitions */

/*----------------------------------------------------------------*/
/* s-record image processing */

/* Data records */
static unsigned int ns3data;
static struct s3datarec *s3data;

/* Plug records */
static unsigned int ns3plug;
static struct s3plugrec s3plug[S3PLUG_MAX];

/* CRC records */
static unsigned int ns3crc;
static struct s3crcrec s3crc[S3CRC_MAX];

/* Info records */
static unsigned int ns3info;
static struct s3inforec s3info[S3INFO_MAX];

/* S7 record (there _better_ be only one) */
static u32 startaddr;

/* Load image chunks */
static unsigned int nfchunks;
static struct imgchunk fchunk[CHUNKS_MAX];

/* Note that for the following pdrec_t arrays, the len and code */
/*   fields are stored in HOST byte order. The mkpdrlist() function */
/*   does the conversion.  */
/*----------------------------------------------------------------*/
/* PDA, built from [card|newfile]+[addfile1+addfile2...] */

static struct pda pda;
static struct hfa384x_compident nicid;
static struct hfa384x_caplevel rfid;
static struct hfa384x_caplevel macid;
static struct hfa384x_caplevel priid;

/*================================================================*/
/* Local Function Declarations */

static int prism2_fwapply(const struct ihex_binrec *rfptr,
                          struct wlandevice *wlandev);

static int read_fwfile(const struct ihex_binrec *rfptr);

static int mkimage(struct imgchunk *clist, unsigned int *ccnt);

static int read_cardpda(struct pda *pda, struct wlandevice *wlandev);

static int mkpdrlist(struct pda *pda);

static int plugimage(struct imgchunk *fchunk, unsigned int nfchunks,
                     struct s3plugrec *s3plug, unsigned int ns3plug,
                     struct pda *pda);

static int crcimage(struct imgchunk *fchunk, unsigned int nfchunks,
                    struct s3crcrec *s3crc, unsigned int ns3crc);

static int writeimage(struct wlandevice *wlandev, struct imgchunk *fchunk,
                      unsigned int nfchunks);

static void free_chunks(struct imgchunk *fchunk, unsigned int *nfchunks);

static void free_srecs(void);

static int validate_identity(void);

/*================================================================*/
/* Function Definitions */

/*----------------------------------------------------------------
 * prism2_fwtry
 *
 * Try and get firmware into memory
 *
 * Arguments:
 *      udev    usb device structure
 *      wlandev wlan device structure
 *
 * Returns:
 *      0       - success
 *      ~0      - failure
 *----------------------------------------------------------------
 */
static int prism2_fwtry(struct usb_device *udev, struct wlandevice *wlandev)
{
        const struct firmware *fw_entry = NULL;

        netdev_info(wlandev->netdev, "prism2_usb: Checking for firmware %s\n",
                    PRISM2_USB_FWFILE);
        if (request_ihex_firmware(&fw_entry,
                                  PRISM2_USB_FWFILE, &udev->dev) != 0) {
                netdev_info(wlandev->netdev,
                            "prism2_usb: Firmware not available, but not essential\n");
                netdev_info(wlandev->netdev,
                            "prism2_usb: can continue to use card anyway.\n");
                return 1;
        }

        netdev_info(wlandev->netdev,
                    "prism2_usb: %s will be processed, size %zu\n",
                    PRISM2_USB_FWFILE, fw_entry->size);
        prism2_fwapply((const struct ihex_binrec *)fw_entry->data, wlandev);

        release_firmware(fw_entry);
        return 0;
}

/*----------------------------------------------------------------
 * prism2_fwapply
 *
 * Apply the firmware loaded into memory
 *
 * Arguments:
 *      rfptr   firmware image in kernel memory
 *      wlandev device
 *
 * Returns:
 *      0       - success
 *      ~0      - failure
 *----------------------------------------------------------------
 */
static int prism2_fwapply(const struct ihex_binrec *rfptr,
                          struct wlandevice *wlandev)
{
        signed int result = 0;
        struct p80211msg_dot11req_mibget getmsg;
        struct p80211itemd *item;
        u32 *data;

        /* Initialize the data structures */
        ns3data = 0;
        s3data = kcalloc(S3DATA_MAX, sizeof(*s3data), GFP_KERNEL);
        if (!s3data) {
                result = -ENOMEM;
                goto out;
        }

        ns3plug = 0;
        memset(s3plug, 0, sizeof(s3plug));
        ns3crc = 0;
        memset(s3crc, 0, sizeof(s3crc));
        ns3info = 0;
        memset(s3info, 0, sizeof(s3info));
        startaddr = 0;

        nfchunks = 0;
        memset(fchunk, 0, sizeof(fchunk));
        memset(&nicid, 0, sizeof(nicid));
        memset(&rfid, 0, sizeof(rfid));
        memset(&macid, 0, sizeof(macid));
        memset(&priid, 0, sizeof(priid));

        /* clear the pda and add an initial END record */
        memset(&pda, 0, sizeof(pda));
        pda.rec[0] = (struct hfa384x_pdrec *)pda.buf;
        pda.rec[0]->len = cpu_to_le16(2);       /* len in words */
        pda.rec[0]->code = cpu_to_le16(HFA384x_PDR_END_OF_PDA);
        pda.nrec = 1;

        /*-----------------------------------------------------*/
        /* Put card into fwload state */
        prism2sta_ifstate(wlandev, P80211ENUM_ifstate_fwload);

        /* Build the PDA we're going to use. */
        if (read_cardpda(&pda, wlandev)) {
                netdev_err(wlandev->netdev, "load_cardpda failed, exiting.\n");
                result = 1;
                goto out;
        }

        /* read the card's PRI-SUP */
        memset(&getmsg, 0, sizeof(getmsg));
        getmsg.msgcode = DIDmsg_dot11req_mibget;
        getmsg.msglen = sizeof(getmsg);
        strcpy(getmsg.devname, wlandev->name);

        getmsg.mibattribute.did = DIDmsg_dot11req_mibget_mibattribute;
        getmsg.mibattribute.status = P80211ENUM_msgitem_status_data_ok;
        getmsg.resultcode.did = DIDmsg_dot11req_mibget_resultcode;
        getmsg.resultcode.status = P80211ENUM_msgitem_status_no_value;

        item = (struct p80211itemd *)getmsg.mibattribute.data;
        item->did = DIDmib_p2_p2NIC_p2PRISupRange;
        item->status = P80211ENUM_msgitem_status_no_value;

        data = (u32 *)item->data;

        /* DIDmsg_dot11req_mibget */
        prism2mgmt_mibset_mibget(wlandev, &getmsg);
        if (getmsg.resultcode.data != P80211ENUM_resultcode_success)
                netdev_err(wlandev->netdev, "Couldn't fetch PRI-SUP info\n");

        /* Already in host order */
        priid.role = *data++;
        priid.id = *data++;
        priid.variant = *data++;
        priid.bottom = *data++;
        priid.top = *data++;

        /* Read the S3 file */
        result = read_fwfile(rfptr);
        if (result) {
                netdev_err(wlandev->netdev,
                           "Failed to read the data exiting.\n");
                goto out;
        }

        result = validate_identity();
        if (result) {
                netdev_err(wlandev->netdev, "Incompatible firmware image.\n");
                goto out;
        }

        if (startaddr == 0x00000000) {
                netdev_err(wlandev->netdev,
                           "Can't RAM download a Flash image!\n");
                result = 1;
                goto out;
        }

        /* Make the image chunks */
        result = mkimage(fchunk, &nfchunks);
        if (result) {
                netdev_err(wlandev->netdev, "Failed to make image chunk.\n");
                goto free_chunks;
        }

        /* Do any plugging */
        result = plugimage(fchunk, nfchunks, s3plug, ns3plug, &pda);
        if (result) {
                netdev_err(wlandev->netdev, "Failed to plug data.\n");
                goto free_chunks;
        }

        /* Insert any CRCs */
        result = crcimage(fchunk, nfchunks, s3crc, ns3crc);
        if (result) {
                netdev_err(wlandev->netdev, "Failed to insert all CRCs\n");
                goto free_chunks;
        }

        /* Write the image */
        result = writeimage(wlandev, fchunk, nfchunks);
        if (result) {
                netdev_err(wlandev->netdev, "Failed to ramwrite image data.\n");
                goto free_chunks;
        }

        netdev_info(wlandev->netdev, "prism2_usb: firmware loading finished.\n");

free_chunks:
        /* clear any allocated memory */
        free_chunks(fchunk, &nfchunks);
        free_srecs();

out:
        return result;
}

/*----------------------------------------------------------------
 * crcimage
 *
 * Adds a CRC16 in the two bytes prior to each block identified by
 * an S3 CRC record.  Currently, we don't actually do a CRC we just
 * insert the value 0xC0DE in hfa384x order.
 *
 * Arguments:
 *      fchunk          Array of image chunks
 *      nfchunks        Number of image chunks
 *      s3crc           Array of crc records
 *      ns3crc          Number of crc records
 *
 * Returns:
 *      0       success
 *      ~0      failure
 *----------------------------------------------------------------
 */
static int crcimage(struct imgchunk *fchunk, unsigned int nfchunks,
                    struct s3crcrec *s3crc, unsigned int ns3crc)
{
        int result = 0;
        int i;
        int c;
        u32 crcstart;
        u32 crcend;
        u32 cstart = 0;
        u32 cend;
        u8 *dest;
        u32 chunkoff;

        for (i = 0; i < ns3crc; i++) {
                if (!s3crc[i].dowrite)
                        continue;
                crcstart = s3crc[i].addr;
                crcend = s3crc[i].addr + s3crc[i].len;
                /* Find chunk */
                for (c = 0; c < nfchunks; c++) {
                        cstart = fchunk[c].addr;
                        cend = fchunk[c].addr + fchunk[c].len;
                        /* the line below does an address & len match search */
                        /* unfortunately, I've found that the len fields of */
                        /* some crc records don't match with the length of */
                        /* the actual data, so we're not checking right now */
                        /* if (crcstart-2 >= cstart && crcend <= cend) break; */

                        /* note the -2 below, it's to make sure the chunk has */
                        /* space for the CRC value */
                        if (crcstart - 2 >= cstart && crcstart < cend)
                                break;
                }
                if (c >= nfchunks) {
                        pr_err("Failed to find chunk for crcrec[%d], addr=0x%06x len=%d , aborting crc.\n",
                               i, s3crc[i].addr, s3crc[i].len);
                        return 1;
                }

                /* Insert crc */
                pr_debug("Adding crc @ 0x%06x\n", s3crc[i].addr - 2);
                chunkoff = crcstart - cstart - 2;
                dest = fchunk[c].data + chunkoff;
                *dest = 0xde;
                *(dest + 1) = 0xc0;
        }
        return result;
}

/*----------------------------------------------------------------
 * free_chunks
 *
 * Clears the chunklist data structures in preparation for a new file.
 *
 * Arguments:
 *      none
 *
 * Returns:
 *      nothing
 *----------------------------------------------------------------
 */
static void free_chunks(struct imgchunk *fchunk, unsigned int *nfchunks)
{
        int i;

        for (i = 0; i < *nfchunks; i++)
                kfree(fchunk[i].data);

        *nfchunks = 0;
        memset(fchunk, 0, sizeof(*fchunk));
}

/*----------------------------------------------------------------
 * free_srecs
 *
 * Clears the srec data structures in preparation for a new file.
 *
 * Arguments:
 *      none
 *
 * Returns:
 *      nothing
 *----------------------------------------------------------------
 */
static void free_srecs(void)
{
        ns3data = 0;
        kfree(s3data);
        ns3plug = 0;
        memset(s3plug, 0, sizeof(s3plug));
        ns3crc = 0;
        memset(s3crc, 0, sizeof(s3crc));
        ns3info = 0;
        memset(s3info, 0, sizeof(s3info));
        startaddr = 0;
}

/*----------------------------------------------------------------
 * mkimage
 *
 * Scans the currently loaded set of S records for data residing
 * in contiguous memory regions.  Each contiguous region is then
 * made into a 'chunk'.  This function assumes that we're building
 * a new chunk list.  Assumes the s3data items are in sorted order.
 *
 * Arguments:   none
 *
 * Returns:
 *      0       - success
 *      ~0      - failure (probably an errno)
 *----------------------------------------------------------------
 */
static int mkimage(struct imgchunk *clist, unsigned int *ccnt)
{
        int result = 0;
        int i;
        int j;
        int currchunk = 0;
        u32 nextaddr = 0;
        u32 s3start;
        u32 s3end;
        u32 cstart = 0;
        u32 cend;
        u32 coffset;

        /* There may already be data in the chunklist */
        *ccnt = 0;

        /* Establish the location and size of each chunk */
        for (i = 0; i < ns3data; i++) {
                if (s3data[i].addr == nextaddr) {
                        /* existing chunk, grow it */
                        clist[currchunk].len += s3data[i].len;
                        nextaddr += s3data[i].len;
                } else {
                        /* New chunk */
                        (*ccnt)++;
                        currchunk = *ccnt - 1;
                        clist[currchunk].addr = s3data[i].addr;
                        clist[currchunk].len = s3data[i].len;
                        nextaddr = s3data[i].addr + s3data[i].len;
                        /* Expand the chunk if there is a CRC record at */
                        /* their beginning bound */
                        for (j = 0; j < ns3crc; j++) {
                                if (s3crc[j].dowrite &&
                                    s3crc[j].addr == clist[currchunk].addr) {
                                        clist[currchunk].addr -= 2;
                                        clist[currchunk].len += 2;
                                }
                        }
                }
        }

        /* We're currently assuming there aren't any overlapping chunks */
        /*  if this proves false, we'll need to add code to coalesce. */

        /* Allocate buffer space for chunks */
        for (i = 0; i < *ccnt; i++) {
                clist[i].data = kzalloc(clist[i].len, GFP_KERNEL);
                if (!clist[i].data) {
                        pr_err("failed to allocate image space, exitting.\n");
                        return 1;
                }
                pr_debug("chunk[%d]: addr=0x%06x len=%d\n",
                         i, clist[i].addr, clist[i].len);
        }

        /* Copy srec data to chunks */
        for (i = 0; i < ns3data; i++) {
                s3start = s3data[i].addr;
                s3end = s3start + s3data[i].len - 1;
                for (j = 0; j < *ccnt; j++) {
                        cstart = clist[j].addr;
                        cend = cstart + clist[j].len - 1;
                        if (s3start >= cstart && s3end <= cend)
                                break;
                }
                if (((unsigned int)j) >= (*ccnt)) {
                        pr_err("s3rec(a=0x%06x,l=%d), no chunk match, exiting.\n",
                               s3start, s3data[i].len);
                        return 1;
                }
                coffset = s3start - cstart;
                memcpy(clist[j].data + coffset, s3data[i].data, s3data[i].len);
        }

        return result;
}

/*----------------------------------------------------------------
 * mkpdrlist
 *
 * Reads a raw PDA and builds an array of pdrec_t structures.
 *
 * Arguments:
 *      pda     buffer containing raw PDA bytes
 *      pdrec   ptr to an array of pdrec_t's.  Will be filled on exit.
 *      nrec    ptr to a variable that will contain the count of PDRs
 *
 * Returns:
 *      0       - success
 *      ~0      - failure (probably an errno)
 *----------------------------------------------------------------
 */
static int mkpdrlist(struct pda *pda)
{
        __le16 *pda16 = (__le16 *)pda->buf;
        int curroff;            /* in 'words' */

        pda->nrec = 0;
        curroff = 0;
        while (curroff < (HFA384x_PDA_LEN_MAX / 2 - 1) &&
               le16_to_cpu(pda16[curroff + 1]) != HFA384x_PDR_END_OF_PDA) {
                pda->rec[pda->nrec] = (struct hfa384x_pdrec *)&pda16[curroff];

                if (le16_to_cpu(pda->rec[pda->nrec]->code) ==
                    HFA384x_PDR_NICID) {
                        memcpy(&nicid, &pda->rec[pda->nrec]->data.nicid,
                               sizeof(nicid));
                        le16_to_cpus(&nicid.id);
                        le16_to_cpus(&nicid.variant);
                        le16_to_cpus(&nicid.major);
                        le16_to_cpus(&nicid.minor);
                }
                if (le16_to_cpu(pda->rec[pda->nrec]->code) ==
                    HFA384x_PDR_MFISUPRANGE) {
                        memcpy(&rfid, &pda->rec[pda->nrec]->data.mfisuprange,
                               sizeof(rfid));
                        le16_to_cpus(&rfid.id);
                        le16_to_cpus(&rfid.variant);
                        le16_to_cpus(&rfid.bottom);
                        le16_to_cpus(&rfid.top);
                }
                if (le16_to_cpu(pda->rec[pda->nrec]->code) ==
                    HFA384x_PDR_CFISUPRANGE) {
                        memcpy(&macid, &pda->rec[pda->nrec]->data.cfisuprange,
                               sizeof(macid));
                        le16_to_cpus(&macid.id);
                        le16_to_cpus(&macid.variant);
                        le16_to_cpus(&macid.bottom);
                        le16_to_cpus(&macid.top);
                }

                (pda->nrec)++;
                curroff += le16_to_cpu(pda16[curroff]) + 1;
        }
        if (curroff >= (HFA384x_PDA_LEN_MAX / 2 - 1)) {
                pr_err("no end record found or invalid lengths in PDR data, exiting. %x %d\n",
                       curroff, pda->nrec);
                return 1;
        }
        pda->rec[pda->nrec] = (struct hfa384x_pdrec *)&pda16[curroff];
        (pda->nrec)++;
        return 0;
}

/*----------------------------------------------------------------
 * plugimage
 *
 * Plugs the given image using the given plug records from the given
 * PDA and filename.
 *
 * Arguments:
 *      fchunk          Array of image chunks
 *      nfchunks        Number of image chunks
 *      s3plug          Array of plug records
 *      ns3plug         Number of plug records
 *      pda             Current pda data
 *
 * Returns:
 *      0       success
 *      ~0      failure
 *----------------------------------------------------------------
 */
static int plugimage(struct imgchunk *fchunk, unsigned int nfchunks,
                     struct s3plugrec *s3plug, unsigned int ns3plug,
                     struct pda *pda)
{
        int result = 0;
        int i;                  /* plug index */
        int j;                  /* index of PDR or -1 if fname plug */
        int c;                  /* chunk index */
        u32 pstart;
        u32 pend;
        u32 cstart = 0;
        u32 cend;
        u32 chunkoff;
        u8 *dest;

        /* for each plug record */
        for (i = 0; i < ns3plug; i++) {
                pstart = s3plug[i].addr;
                pend = s3plug[i].addr + s3plug[i].len;
                /* find the matching PDR (or filename) */
                if (s3plug[i].itemcode != 0xffffffffUL) { /* not filename */
                        for (j = 0; j < pda->nrec; j++) {
                                if (s3plug[i].itemcode ==
                                    le16_to_cpu(pda->rec[j]->code))
                                        break;
                        }
                } else {
                        j = -1;
                }
                if (j >= pda->nrec && j != -1) { /*  if no matching PDR, fail */
                        pr_warn("warning: Failed to find PDR for plugrec 0x%04x.\n",
                                s3plug[i].itemcode);
                        continue;       /* and move on to the next PDR */
#if 0
                        /* MSM: They swear that unless it's the MAC address,
                         * the serial number, or the TX calibration records,
                         * then there's reasonable defaults in the f/w
                         * image.  Therefore, missing PDRs in the card
                         * should only be a warning, not fatal.
                         * TODO: add fatals for the PDRs mentioned above.
                         */
                        result = 1;
                        continue;
#endif
                }

                /* Validate plug len against PDR len */
                if (j != -1 && s3plug[i].len < le16_to_cpu(pda->rec[j]->len)) {
                        pr_err("error: Plug vs. PDR len mismatch for plugrec 0x%04x, abort plugging.\n",
                               s3plug[i].itemcode);
                        result = 1;
                        continue;
                }

                /*
                 * Validate plug address against
                 * chunk data and identify chunk
                 */
                for (c = 0; c < nfchunks; c++) {
                        cstart = fchunk[c].addr;
                        cend = fchunk[c].addr + fchunk[c].len;
                        if (pstart >= cstart && pend <= cend)
                                break;
                }
                if (c >= nfchunks) {
                        pr_err("error: Failed to find image chunk for plugrec 0x%04x.\n",
                               s3plug[i].itemcode);
                        result = 1;
                        continue;
                }

                /* Plug data */
                chunkoff = pstart - cstart;
                dest = fchunk[c].data + chunkoff;
                pr_debug("Plugging item 0x%04x @ 0x%06x, len=%d, cnum=%d coff=0x%06x\n",
                         s3plug[i].itemcode, pstart, s3plug[i].len,
                         c, chunkoff);

                if (j == -1) {  /* plug the filename */
                        memset(dest, 0, s3plug[i].len);
                        strncpy(dest, PRISM2_USB_FWFILE, s3plug[i].len - 1);
                } else {        /* plug a PDR */
                        memcpy(dest, &pda->rec[j]->data, s3plug[i].len);
                }
        }
        return result;
}

/*----------------------------------------------------------------
 * read_cardpda
 *
 * Sends the command for the driver to read the pda from the card
 * named in the device variable.  Upon success, the card pda is
 * stored in the "cardpda" variables.  Note that the pda structure
 * is considered 'well formed' after this function.  That means
 * that the nrecs is valid, the rec array has been set up, and there's
 * a valid PDAEND record in the raw PDA data.
 *
 * Arguments:
 *      pda             pda structure
 *      wlandev         device
 *
 * Returns:
 *      0       - success
 *      ~0      - failure (probably an errno)
 *----------------------------------------------------------------
 */
static int read_cardpda(struct pda *pda, struct wlandevice *wlandev)
{
        int result = 0;
        struct p80211msg_p2req_readpda *msg;

        msg = kzalloc(sizeof(*msg), GFP_KERNEL);
        if (!msg)
                return -ENOMEM;

        /* set up the msg */
        msg->msgcode = DIDmsg_p2req_readpda;
        msg->msglen = sizeof(msg);
        strcpy(msg->devname, wlandev->name);
        msg->pda.did = DIDmsg_p2req_readpda_pda;
        msg->pda.len = HFA384x_PDA_LEN_MAX;
        msg->pda.status = P80211ENUM_msgitem_status_no_value;
        msg->resultcode.did = DIDmsg_p2req_readpda_resultcode;
        msg->resultcode.len = sizeof(u32);
        msg->resultcode.status = P80211ENUM_msgitem_status_no_value;

        if (prism2mgmt_readpda(wlandev, msg) != 0) {
                /* prism2mgmt_readpda prints an errno if appropriate */
                result = -1;
        } else if (msg->resultcode.data == P80211ENUM_resultcode_success) {
                memcpy(pda->buf, msg->pda.data, HFA384x_PDA_LEN_MAX);
                result = mkpdrlist(pda);
        } else {
                /* resultcode must've been something other than success */
                result = -1;
        }

        kfree(msg);
        return result;
}

/*----------------------------------------------------------------
 * read_fwfile
 *
 * Reads the given fw file which should have been compiled from an srec
 * file. Each record in the fw file will either be a plain data record,
 * a start address record, or other records used for plugging.
 *
 * Note that data records are expected to be sorted into
 * ascending address order in the fw file.
 *
 * Note also that the start address record, originally an S7 record in
 * the srec file, is expected in the fw file to be like a data record but
 * with a certain address to make it identifiable.
 *
 * Here's the SREC format that the fw should have come from:
 * S[37]nnaaaaaaaaddd...dddcc
 *
 *       nn - number of bytes starting with the address field
 * aaaaaaaa - address in readable (or big endian) format
 * dd....dd - 0-245 data bytes (two chars per byte)
 *       cc - checksum
 *
 * The S7 record's (there should be only one) address value gets
 * converted to an S3 record with address of 0xff400000, with the
 * start address being stored as a 4 byte data word. That address is
 * the start execution address used for RAM downloads.
 *
 * The S3 records have a collection of subformats indicated by the
 * value of aaaaaaaa:
 *   0xff000000 - Plug record, data field format:
 *                xxxxxxxxaaaaaaaassssssss
 *                x - PDR code number (little endian)
 *                a - Address in load image to plug (little endian)
 *                s - Length of plug data area (little endian)
 *
 *   0xff100000 - CRC16 generation record, data field format:
 *                aaaaaaaassssssssbbbbbbbb
 *                a - Start address for CRC calculation (little endian)
 *                s - Length of data to  calculate over (little endian)
 *                b - Boolean, true=write crc, false=don't write
 *
 *   0xff200000 - Info record, data field format:
 *                ssssttttdd..dd
 *                s - Size in words (little endian)
 *                t - Info type (little endian), see #defines and
 *                    struct s3inforec for details about types.
 *                d - (s - 1) little endian words giving the contents of
 *                    the given info type.
 *
 *   0xff400000 - Start address record, data field format:
 *                aaaaaaaa
 *                a - Address in load image to plug (little endian)
 *
 * Arguments:
 *      record  firmware image (ihex record structure) in kernel memory
 *
 * Returns:
 *      0       - success
 *      ~0      - failure (probably an errno)
 *----------------------------------------------------------------
 */
static int read_fwfile(const struct ihex_binrec *record)
{
        int             i;
        int             rcnt = 0;
        u16             *tmpinfo;
        u16             *ptr16;
        u32             *ptr32, len, addr;

        pr_debug("Reading fw file ...\n");

        while (record) {
                rcnt++;

                len = be16_to_cpu(record->len);
                addr = be32_to_cpu(record->addr);

                /* Point into data for different word lengths */
                ptr32 = (u32 *)record->data;
                ptr16 = (u16 *)record->data;

                /* parse what was an S3 srec and put it in the right array */
                switch (addr) {
                case S3ADDR_START:
                        startaddr = *ptr32;
                        pr_debug("  S7 start addr, record=%d addr=0x%08x\n",
                                 rcnt,
                                 startaddr);
                        break;
                case S3ADDR_PLUG:
                        s3plug[ns3plug].itemcode = *ptr32;
                        s3plug[ns3plug].addr = *(ptr32 + 1);
                        s3plug[ns3plug].len = *(ptr32 + 2);

                        pr_debug("  S3 plugrec, record=%d itemcode=0x%08x addr=0x%08x len=%d\n",
                                 rcnt,
                                 s3plug[ns3plug].itemcode,
                                 s3plug[ns3plug].addr,
                                 s3plug[ns3plug].len);

                        ns3plug++;
                        if (ns3plug == S3PLUG_MAX) {
                                pr_err("S3 plugrec limit reached - aborting\n");
                                return 1;
                        }
                        break;
                case S3ADDR_CRC:
                        s3crc[ns3crc].addr = *ptr32;
                        s3crc[ns3crc].len = *(ptr32 + 1);
                        s3crc[ns3crc].dowrite = *(ptr32 + 2);

                        pr_debug("  S3 crcrec, record=%d addr=0x%08x len=%d write=0x%08x\n",
                                 rcnt,
                                 s3crc[ns3crc].addr,
                                 s3crc[ns3crc].len,
                                 s3crc[ns3crc].dowrite);
                        ns3crc++;
                        if (ns3crc == S3CRC_MAX) {
                                pr_err("S3 crcrec limit reached - aborting\n");
                                return 1;
                        }
                        break;
                case S3ADDR_INFO:
                        s3info[ns3info].len = *ptr16;
                        s3info[ns3info].type = *(ptr16 + 1);

                        pr_debug("  S3 inforec, record=%d len=0x%04x type=0x%04x\n",
                                 rcnt,
                                 s3info[ns3info].len,
                                 s3info[ns3info].type);
                        if (((s3info[ns3info].len - 1) * sizeof(u16)) >
                           sizeof(s3info[ns3info].info)) {
                                pr_err("S3 inforec length too long - aborting\n");
                                return 1;
                        }

                        tmpinfo = (u16 *)&s3info[ns3info].info.version;
                        pr_debug("            info=");
                        for (i = 0; i < s3info[ns3info].len - 1; i++) {
                                tmpinfo[i] = *(ptr16 + 2 + i);
                                pr_debug("%04x ", tmpinfo[i]);
                        }
                        pr_debug("\n");

                        ns3info++;
                        if (ns3info == S3INFO_MAX) {
                                pr_err("S3 inforec limit reached - aborting\n");
                                return 1;
                        }
                        break;
                default:        /* Data record */
                        s3data[ns3data].addr = addr;
                        s3data[ns3data].len = len;
                        s3data[ns3data].data = (uint8_t *)record->data;
                        ns3data++;
                        if (ns3data == S3DATA_MAX) {
                                pr_err("S3 datarec limit reached - aborting\n");
                                return 1;
                        }
                        break;
                }
                record = ihex_next_binrec(record);
        }
        return 0;
}

/*----------------------------------------------------------------
 * writeimage
 *
 * Takes the chunks, builds p80211 messages and sends them down
 * to the driver for writing to the card.
 *
 * Arguments:
 *      wlandev         device
 *      fchunk          Array of image chunks
 *      nfchunks        Number of image chunks
 *
 * Returns:
 *      0       success
 *      ~0      failure
 *----------------------------------------------------------------
 */
static int writeimage(struct wlandevice *wlandev, struct imgchunk *fchunk,

                      unsigned int nfchunks)
{
        int result = 0;
        struct p80211msg_p2req_ramdl_state *rstmsg;
        struct p80211msg_p2req_ramdl_write *rwrmsg;
        u32 resultcode;
        int i;
        int j;
        unsigned int nwrites;
        u32 curroff;
        u32 currlen;
        u32 currdaddr;

        rstmsg = kzalloc(sizeof(*rstmsg), GFP_KERNEL);
        rwrmsg = kzalloc(sizeof(*rwrmsg), GFP_KERNEL);
        if (!rstmsg || !rwrmsg) {
                kfree(rstmsg);
                kfree(rwrmsg);
                netdev_err(wlandev->netdev,
                           "%s: no memory for firmware download, aborting download\n",
                           __func__);
                return -ENOMEM;
        }

        /* Initialize the messages */
        strcpy(rstmsg->devname, wlandev->name);
        rstmsg->msgcode = DIDmsg_p2req_ramdl_state;
        rstmsg->msglen = sizeof(*rstmsg);
        rstmsg->enable.did = DIDmsg_p2req_ramdl_state_enable;
        rstmsg->exeaddr.did = DIDmsg_p2req_ramdl_state_exeaddr;
        rstmsg->resultcode.did = DIDmsg_p2req_ramdl_state_resultcode;
        rstmsg->enable.status = P80211ENUM_msgitem_status_data_ok;
        rstmsg->exeaddr.status = P80211ENUM_msgitem_status_data_ok;
        rstmsg->resultcode.status = P80211ENUM_msgitem_status_no_value;
        rstmsg->enable.len = sizeof(u32);
        rstmsg->exeaddr.len = sizeof(u32);
        rstmsg->resultcode.len = sizeof(u32);

        strcpy(rwrmsg->devname, wlandev->name);
        rwrmsg->msgcode = DIDmsg_p2req_ramdl_write;
        rwrmsg->msglen = sizeof(*rwrmsg);
        rwrmsg->addr.did = DIDmsg_p2req_ramdl_write_addr;
        rwrmsg->len.did = DIDmsg_p2req_ramdl_write_len;
        rwrmsg->data.did = DIDmsg_p2req_ramdl_write_data;
        rwrmsg->resultcode.did = DIDmsg_p2req_ramdl_write_resultcode;
        rwrmsg->addr.status = P80211ENUM_msgitem_status_data_ok;
        rwrmsg->len.status = P80211ENUM_msgitem_status_data_ok;
        rwrmsg->data.status = P80211ENUM_msgitem_status_data_ok;
        rwrmsg->resultcode.status = P80211ENUM_msgitem_status_no_value;
        rwrmsg->addr.len = sizeof(u32);
        rwrmsg->len.len = sizeof(u32);
        rwrmsg->data.len = WRITESIZE_MAX;
        rwrmsg->resultcode.len = sizeof(u32);

        /* Send xxx_state(enable) */
        pr_debug("Sending dl_state(enable) message.\n");
        rstmsg->enable.data = P80211ENUM_truth_true;
        rstmsg->exeaddr.data = startaddr;

        result = prism2mgmt_ramdl_state(wlandev, rstmsg);
        if (result) {
                netdev_err(wlandev->netdev,
                           "%s state enable failed w/ result=%d, aborting download\n",
                           __func__, result);
                goto free_result;
        }
        resultcode = rstmsg->resultcode.data;
        if (resultcode != P80211ENUM_resultcode_success) {
                netdev_err(wlandev->netdev,
                           "%s()->xxxdl_state msg indicates failure, w/ resultcode=%d, aborting download.\n",
                           __func__, resultcode);
                result = 1;
                goto free_result;
        }

        /* Now, loop through the data chunks and send WRITESIZE_MAX data */
        for (i = 0; i < nfchunks; i++) {
                nwrites = fchunk[i].len / WRITESIZE_MAX;
                nwrites += (fchunk[i].len % WRITESIZE_MAX) ? 1 : 0;
                curroff = 0;
                for (j = 0; j < nwrites; j++) {
                        /* TODO Move this to a separate function */
                        int lenleft = fchunk[i].len - (WRITESIZE_MAX * j);

                        if (fchunk[i].len > WRITESIZE_MAX)
                                currlen = WRITESIZE_MAX;
                        else
                                currlen = lenleft;
                        curroff = j * WRITESIZE_MAX;
                        currdaddr = fchunk[i].addr + curroff;
                        /* Setup the message */
                        rwrmsg->addr.data = currdaddr;
                        rwrmsg->len.data = currlen;
                        memcpy(rwrmsg->data.data,
                               fchunk[i].data + curroff, currlen);

                        /* Send flashdl_write(pda) */
                        pr_debug
                            ("Sending xxxdl_write message addr=%06x len=%d.\n",
                             currdaddr, currlen);

                        result = prism2mgmt_ramdl_write(wlandev, rwrmsg);

                        /* Check the results */
                        if (result) {
                                netdev_err(wlandev->netdev,
                                           "%s chunk write failed w/ result=%d, aborting download\n",
                                           __func__, result);
                                goto free_result;
                        }
                        resultcode = rstmsg->resultcode.data;
                        if (resultcode != P80211ENUM_resultcode_success) {
                                pr_err("%s()->xxxdl_write msg indicates failure, w/ resultcode=%d, aborting download.\n",
                                       __func__, resultcode);
                                result = 1;
                                goto free_result;
                        }
                }
        }

        /* Send xxx_state(disable) */
        pr_debug("Sending dl_state(disable) message.\n");
        rstmsg->enable.data = P80211ENUM_truth_false;
        rstmsg->exeaddr.data = 0;

        result = prism2mgmt_ramdl_state(wlandev, rstmsg);
        if (result) {
                netdev_err(wlandev->netdev,
                           "%s state disable failed w/ result=%d, aborting download\n",
                           __func__, result);
                goto free_result;
        }
        resultcode = rstmsg->resultcode.data;
        if (resultcode != P80211ENUM_resultcode_success) {
                netdev_err(wlandev->netdev,
                           "%s()->xxxdl_state msg indicates failure, w/ resultcode=%d, aborting download.\n",
                           __func__, resultcode);
                result = 1;
                goto free_result;
        }

free_result:
        kfree(rstmsg);
        kfree(rwrmsg);
        return result;
}

static int validate_identity(void)
{
        int i;
        int result = 1;
        int trump = 0;

        pr_debug("NIC ID: %#x v%d.%d.%d\n",
                 nicid.id, nicid.major, nicid.minor, nicid.variant);
        pr_debug("MFI ID: %#x v%d %d->%d\n",
                 rfid.id, rfid.variant, rfid.bottom, rfid.top);
        pr_debug("CFI ID: %#x v%d %d->%d\n",
                 macid.id, macid.variant, macid.bottom, macid.top);
        pr_debug("PRI ID: %#x v%d %d->%d\n",
                 priid.id, priid.variant, priid.bottom, priid.top);

        for (i = 0; i < ns3info; i++) {
                switch (s3info[i].type) {
                case 1:
                        pr_debug("Version:  ID %#x %d.%d.%d\n",
                                 s3info[i].info.version.id,
                                 s3info[i].info.version.major,
                                 s3info[i].info.version.minor,
                                 s3info[i].info.version.variant);
                        break;
                case 2:
                        pr_debug("Compat: Role %#x Id %#x v%d %d->%d\n",
                                 s3info[i].info.compat.role,
                                 s3info[i].info.compat.id,
                                 s3info[i].info.compat.variant,
                                 s3info[i].info.compat.bottom,
                                 s3info[i].info.compat.top);

                        /* MAC compat range */
                        if ((s3info[i].info.compat.role == 1) &&
                            (s3info[i].info.compat.id == 2)) {
                                if (s3info[i].info.compat.variant !=
                                    macid.variant) {
                                        result = 2;
                                }
                        }

                        /* PRI compat range */
                        if ((s3info[i].info.compat.role == 1) &&
                            (s3info[i].info.compat.id == 3)) {
                                if ((s3info[i].info.compat.bottom > priid.top)
                                    || (s3info[i].info.compat.top <
                                        priid.bottom)) {
                                        result = 3;
                                }
                        }
                        /* SEC compat range */
                        if ((s3info[i].info.compat.role == 1) &&
                            (s3info[i].info.compat.id == 4)) {
                                /* FIXME: isn't something missing here? */
                        }

                        break;
                case 3:
                        pr_debug("Seq: %#x\n", s3info[i].info.buildseq);

                        break;
                case 4:
                        pr_debug("Platform:  ID %#x %d.%d.%d\n",
                                 s3info[i].info.version.id,
                                 s3info[i].info.version.major,
                                 s3info[i].info.version.minor,
                                 s3info[i].info.version.variant);

                        if (nicid.id != s3info[i].info.version.id)
                                continue;
                        if (nicid.major != s3info[i].info.version.major)
                                continue;
                        if (nicid.minor != s3info[i].info.version.minor)
                                continue;
                        if ((nicid.variant != s3info[i].info.version.variant) &&
                            (nicid.id != 0x8008))
                                continue;

                        trump = 1;
                        break;
                case 0x8001:
                        pr_debug("name inforec len %d\n", s3info[i].len);

                        break;
                default:
                        pr_debug("Unknown inforec type %d\n", s3info[i].type);
                }
        }
        /* walk through */

        if (trump && (result != 2))
                result = 0;
        return result;
}