/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/slab.h>
#include "vnic_resource.h"
#include "vnic_devcmd.h"
#include "vnic_dev.h"
#include "vnic_stats.h"

struct vnic_res {
        void __iomem *vaddr;
        unsigned int count;
};

struct vnic_dev {
        void *priv;
        struct pci_dev *pdev;
        struct vnic_res res[RES_TYPE_MAX];
        enum vnic_dev_intr_mode intr_mode;
        struct vnic_devcmd __iomem *devcmd;
        struct vnic_devcmd_notify *notify;
        struct vnic_devcmd_notify notify_copy;
        dma_addr_t notify_pa;
        u32 *linkstatus;
        dma_addr_t linkstatus_pa;
        struct vnic_stats *stats;
        dma_addr_t stats_pa;
        struct vnic_devcmd_fw_info *fw_info;
        dma_addr_t fw_info_pa;
};

#define VNIC_MAX_RES_HDR_SIZE \
        (sizeof(struct vnic_resource_header) + \
        sizeof(struct vnic_resource) * RES_TYPE_MAX)
#define VNIC_RES_STRIDE 128

void *vnic_dev_priv(struct vnic_dev *vdev)
{
        return vdev->priv;
}

static int vnic_dev_discover_res(struct vnic_dev *vdev,
        struct vnic_dev_bar *bar)
{
        struct vnic_resource_header __iomem *rh;
        struct vnic_resource __iomem *r;
        u8 type;

        if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
                printk(KERN_ERR "vNIC BAR0 res hdr length error\n");
                return -EINVAL;
        }

        rh = bar->vaddr;
        if (!rh) {
                printk(KERN_ERR "vNIC BAR0 res hdr not mem-mapped\n");
                return -EINVAL;
        }

        if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
            ioread32(&rh->version) != VNIC_RES_VERSION) {
                printk(KERN_ERR "vNIC BAR0 res magic/version error "
                        "exp (%lx/%lx) curr (%x/%x)\n",
                        VNIC_RES_MAGIC, VNIC_RES_VERSION,
                        ioread32(&rh->magic), ioread32(&rh->version));
                return -EINVAL;
        }

        r = (struct vnic_resource __iomem *)(rh + 1);

        while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {

                u8 bar_num = ioread8(&r->bar);
                u32 bar_offset = ioread32(&r->bar_offset);
                u32 count = ioread32(&r->count);
                u32 len;

                r++;

                if (bar_num != 0)  /* only mapping in BAR0 resources */
                        continue;

                switch (type) {
                case RES_TYPE_WQ:
                case RES_TYPE_RQ:
                case RES_TYPE_CQ:
                case RES_TYPE_INTR_CTRL:
                        /* each count is stride bytes long */
                        len = count * VNIC_RES_STRIDE;
                        if (len + bar_offset > bar->len) {
                                printk(KERN_ERR "vNIC BAR0 resource %d "
                                        "out-of-bounds, offset 0x%x + "
                                        "size 0x%x > bar len 0x%lx\n",
                                        type, bar_offset,
                                        len,
                                        bar->len);
                                return -EINVAL;
                        }
                        break;
                case RES_TYPE_INTR_PBA_LEGACY:
                case RES_TYPE_DEVCMD:
                        len = count;
                        break;
                default:
                        continue;
                }

                vdev->res[type].count = count;
                vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
        }

        return 0;
}

unsigned int vnic_dev_get_res_count(struct vnic_dev *vdev,
        enum vnic_res_type type)
{
        return vdev->res[type].count;
}

void __iomem *vnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
        unsigned int index)
{
        if (!vdev->res[type].vaddr)
                return NULL;

        switch (type) {
        case RES_TYPE_WQ:
        case RES_TYPE_RQ:
        case RES_TYPE_CQ:
        case RES_TYPE_INTR_CTRL:
                return (char __iomem *)vdev->res[type].vaddr +
                                        index * VNIC_RES_STRIDE;
        default:
                return (char __iomem *)vdev->res[type].vaddr;
        }
}

unsigned int vnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
                                     unsigned int desc_count,
                                     unsigned int desc_size)
{
        /* The base address of the desc rings must be 512 byte aligned.
         * Descriptor count is aligned to groups of 32 descriptors.  A
         * count of 0 means the maximum 4096 descriptors.  Descriptor
         * size is aligned to 16 bytes.
         */

        unsigned int count_align = 32;
        unsigned int desc_align = 16;

        ring->base_align = 512;

        if (desc_count == 0)
                desc_count = 4096;

        ring->desc_count = ALIGN(desc_count, count_align);

        ring->desc_size = ALIGN(desc_size, desc_align);

        ring->size = ring->desc_count * ring->desc_size;
        ring->size_unaligned = ring->size + ring->base_align;

        return ring->size_unaligned;
}

void vnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
{
        memset(ring->descs, 0, ring->size);
}

int vnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
        unsigned int desc_count, unsigned int desc_size)
{
        vnic_dev_desc_ring_size(ring, desc_count, desc_size);

        ring->descs_unaligned = pci_alloc_consistent(vdev->pdev,
                ring->size_unaligned,
                &ring->base_addr_unaligned);

        if (!ring->descs_unaligned) {
                printk(KERN_ERR
                  "Failed to allocate ring (size=%d), aborting\n",
                        (int)ring->size);
                return -ENOMEM;
        }

        ring->base_addr = ALIGN(ring->base_addr_unaligned,
                ring->base_align);
        ring->descs = (u8 *)ring->descs_unaligned +
                (ring->base_addr - ring->base_addr_unaligned);

        vnic_dev_clear_desc_ring(ring);

        ring->desc_avail = ring->desc_count - 1;

        return 0;
}

void vnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
{
        if (ring->descs) {
                pci_free_consistent(vdev->pdev,
                        ring->size_unaligned,
                        ring->descs_unaligned,
                        ring->base_addr_unaligned);
                ring->descs = NULL;
        }
}

int vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
        u64 *a0, u64 *a1, int wait)
{
        struct vnic_devcmd __iomem *devcmd = vdev->devcmd;
        int delay;
        u32 status;
        int dev_cmd_err[] = {
                /* convert from fw's version of error.h to host's version */
                0,      /* ERR_SUCCESS */
                EINVAL, /* ERR_EINVAL */
                EFAULT, /* ERR_EFAULT */
                EPERM,  /* ERR_EPERM */
                EBUSY,  /* ERR_EBUSY */
        };
        int err;

        status = ioread32(&devcmd->status);
        if (status & STAT_BUSY) {
                printk(KERN_ERR "Busy devcmd %d\n", _CMD_N(cmd));
                return -EBUSY;
        }

        if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
                writeq(*a0, &devcmd->args[0]);
                writeq(*a1, &devcmd->args[1]);
                wmb();
        }

        iowrite32(cmd, &devcmd->cmd);

        if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
                        return 0;

        for (delay = 0; delay < wait; delay++) {

                udelay(100);

                status = ioread32(&devcmd->status);
                if (!(status & STAT_BUSY)) {

                        if (status & STAT_ERROR) {
                                err = dev_cmd_err[(int)readq(&devcmd->args[0])];
                                printk(KERN_ERR "Error %d devcmd %d\n",
                                        err, _CMD_N(cmd));
                                return -err;
                        }

                        if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
                                rmb();
                                *a0 = readq(&devcmd->args[0]);
                                *a1 = readq(&devcmd->args[1]);
                        }

                        return 0;
                }
        }

        printk(KERN_ERR "Timedout devcmd %d\n", _CMD_N(cmd));
        return -ETIMEDOUT;
}

int vnic_dev_fw_info(struct vnic_dev *vdev,
        struct vnic_devcmd_fw_info **fw_info)
{
        u64 a0, a1 = 0;
        int wait = 1000;
        int err = 0;

        if (!vdev->fw_info) {
                vdev->fw_info = pci_alloc_consistent(vdev->pdev,
                        sizeof(struct vnic_devcmd_fw_info),
                        &vdev->fw_info_pa);
                if (!vdev->fw_info)
                        return -ENOMEM;

                a0 = vdev->fw_info_pa;

                /* only get fw_info once and cache it */
                err = vnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
        }

        *fw_info = vdev->fw_info;

        return err;
}

int vnic_dev_spec(struct vnic_dev *vdev, unsigned int offset, unsigned int size,
        void *value)
{
        u64 a0, a1;
        int wait = 1000;
        int err;

        a0 = offset;
        a1 = size;

        err = vnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);

        switch (size) {
        case 1:
                *(u8 *)value = (u8)a0;
                break;
        case 2:
                *(u16 *)value = (u16)a0;
                break;
        case 4:
                *(u32 *)value = (u32)a0;
                break;
        case 8:
                *(u64 *)value = a0;
                break;
        default:
                BUG();
                break;
        }

        return err;
}

int vnic_dev_stats_clear(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
}

int vnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
{
        u64 a0, a1;
        int wait = 1000;

        if (!vdev->stats) {
                vdev->stats = pci_alloc_consistent(vdev->pdev,
                        sizeof(struct vnic_stats), &vdev->stats_pa);
                if (!vdev->stats)
                        return -ENOMEM;
        }

        *stats = vdev->stats;
        a0 = vdev->stats_pa;
        a1 = sizeof(struct vnic_stats);

        return vnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
}

int vnic_dev_close(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
}

int vnic_dev_enable(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
}

int vnic_dev_disable(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
}

int vnic_dev_open(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
}

int vnic_dev_open_done(struct vnic_dev *vdev, int *done)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;

        *done = 0;

        err = vnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
        if (err)
                return err;

        *done = (a0 == 0);

        return 0;
}

int vnic_dev_soft_reset(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_SOFT_RESET, &a0, &a1, wait);
}

int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;

        *done = 0;

        err = vnic_dev_cmd(vdev, CMD_SOFT_RESET_STATUS, &a0, &a1, wait);
        if (err)
                return err;

        *done = (a0 == 0);

        return 0;
}

int vnic_dev_hang_notify(struct vnic_dev *vdev)
{
        u64 a0, a1;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_HANG_NOTIFY, &a0, &a1, wait);
}

int vnic_dev_mac_addr(struct vnic_dev *vdev, u8 *mac_addr)
{
        u64 a0, a1;
        int wait = 1000;
        int err, i;

        for (i = 0; i < ETH_ALEN; i++)
                mac_addr[i] = 0;

        err = vnic_dev_cmd(vdev, CMD_MAC_ADDR, &a0, &a1, wait);
        if (err)
                return err;

        for (i = 0; i < ETH_ALEN; i++)
                mac_addr[i] = ((u8 *)&a0)[i];

        return 0;
}

void vnic_dev_packet_filter(struct vnic_dev *vdev, int directed, int multicast,
        int broadcast, int promisc, int allmulti)
{
        u64 a0, a1 = 0;
        int wait = 1000;
        int err;

        a0 = (directed ? CMD_PFILTER_DIRECTED : 0) |
             (multicast ? CMD_PFILTER_MULTICAST : 0) |
             (broadcast ? CMD_PFILTER_BROADCAST : 0) |
             (promisc ? CMD_PFILTER_PROMISCUOUS : 0) |
             (allmulti ? CMD_PFILTER_ALL_MULTICAST : 0);

        err = vnic_dev_cmd(vdev, CMD_PACKET_FILTER, &a0, &a1, wait);
        if (err)
                printk(KERN_ERR "Can't set packet filter\n");
}

void vnic_dev_add_addr(struct vnic_dev *vdev, u8 *addr)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a0)[i] = addr[i];

        err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a0, &a1, wait);
        if (err)
                printk(KERN_ERR
                        "Can't add addr [%02x:%02x:%02x:%02x:%02x:%02x], %d\n",
                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
                        err);
}

void vnic_dev_del_addr(struct vnic_dev *vdev, u8 *addr)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a0)[i] = addr[i];

        err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a0, &a1, wait);
        if (err)
                printk(KERN_ERR
                        "Can't del addr [%02x:%02x:%02x:%02x:%02x:%02x], %d\n",
                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
                        err);
}

int vnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
{
        u64 a0, a1;
        int wait = 1000;

        if (!vdev->notify) {
                vdev->notify = pci_alloc_consistent(vdev->pdev,
                        sizeof(struct vnic_devcmd_notify),
                        &vdev->notify_pa);
                if (!vdev->notify)
                        return -ENOMEM;
        }

        a0 = vdev->notify_pa;
        a1 = ((u64)intr << 32) & 0x0000ffff00000000ULL;
        a1 += sizeof(struct vnic_devcmd_notify);

        return vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
}

void vnic_dev_notify_unset(struct vnic_dev *vdev)
{
        u64 a0, a1;
        int wait = 1000;

        a0 = 0;  /* paddr = 0 to unset notify buffer */
        a1 = 0x0000ffff00000000ULL; /* intr num = -1 to unreg for intr */
        a1 += sizeof(struct vnic_devcmd_notify);

        vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
}

static int vnic_dev_notify_ready(struct vnic_dev *vdev)
{
        u32 *words;
        unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
        unsigned int i;
        u32 csum;

        if (!vdev->notify)
                return 0;

        do {
                csum = 0;
                memcpy(&vdev->notify_copy, vdev->notify,
                        sizeof(struct vnic_devcmd_notify));
                words = (u32 *)&vdev->notify_copy;
                for (i = 1; i < nwords; i++)
                        csum += words[i];
        } while (csum != words[0]);

        return 1;
}

int vnic_dev_init(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
}

int vnic_dev_link_status(struct vnic_dev *vdev)
{
        if (vdev->linkstatus)
                return *vdev->linkstatus;

        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.link_state;
}

u32 vnic_dev_port_speed(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.port_speed;
}

u32 vnic_dev_msg_lvl(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.msglvl;
}

u32 vnic_dev_mtu(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.mtu;
}

u32 vnic_dev_link_down_cnt(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.link_down_cnt;
}

void vnic_dev_set_intr_mode(struct vnic_dev *vdev,
        enum vnic_dev_intr_mode intr_mode)
{
        vdev->intr_mode = intr_mode;
}

enum vnic_dev_intr_mode vnic_dev_get_intr_mode(
        struct vnic_dev *vdev)
{
        return vdev->intr_mode;
}

void vnic_dev_unregister(struct vnic_dev *vdev)
{
        if (vdev) {
                if (vdev->notify)
                        pci_free_consistent(vdev->pdev,
                                sizeof(struct vnic_devcmd_notify),
                                vdev->notify,
                                vdev->notify_pa);
                if (vdev->linkstatus)
                        pci_free_consistent(vdev->pdev,
                                sizeof(u32),
                                vdev->linkstatus,
                                vdev->linkstatus_pa);
                if (vdev->stats)
                        pci_free_consistent(vdev->pdev,
                                sizeof(struct vnic_stats),
                                vdev->stats, vdev->stats_pa);
                if (vdev->fw_info)
                        pci_free_consistent(vdev->pdev,
                                sizeof(struct vnic_devcmd_fw_info),
                                vdev->fw_info, vdev->fw_info_pa);
                kfree(vdev);
        }
}

struct vnic_dev *vnic_dev_register(struct vnic_dev *vdev,
        void *priv, struct pci_dev *pdev, struct vnic_dev_bar *bar)
{
        if (!vdev) {
                vdev = kzalloc(sizeof(struct vnic_dev), GFP_KERNEL);
                if (!vdev)
                        return NULL;
        }

        vdev->priv = priv;
        vdev->pdev = pdev;

        if (vnic_dev_discover_res(vdev, bar))
                goto err_out;

        vdev->devcmd = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD, 0);
        if (!vdev->devcmd)
                goto err_out;

        return vdev;

err_out:
        vnic_dev_unregister(vdev);
        return NULL;
}