/* ZD1211 USB-WLAN driver for Linux
 *
 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

/* This file implements all the hardware specific functions for the ZD1211
 * and ZD1211B chips. Support for the ZD1211B was possible after Timothy
 * Legge sent me a ZD1211B device. Thank you Tim. -- Uli
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>

#include "zd_def.h"
#include "zd_chip.h"
#include "zd_mac.h"
#include "zd_rf.h"

void zd_chip_init(struct zd_chip *chip,
                 struct ieee80211_hw *hw,
                 struct usb_interface *intf)
{
        memset(chip, 0, sizeof(*chip));
        mutex_init(&chip->mutex);
        zd_usb_init(&chip->usb, hw, intf);
        zd_rf_init(&chip->rf);
}

void zd_chip_clear(struct zd_chip *chip)
{
        ZD_ASSERT(!mutex_is_locked(&chip->mutex));
        zd_usb_clear(&chip->usb);
        zd_rf_clear(&chip->rf);
        mutex_destroy(&chip->mutex);
        ZD_MEMCLEAR(chip, sizeof(*chip));
}

static int scnprint_mac_oui(struct zd_chip *chip, char *buffer, size_t size)
{
        u8 *addr = zd_mac_get_perm_addr(zd_chip_to_mac(chip));
        return scnprintf(buffer, size, "%02x-%02x-%02x",
                         addr[0], addr[1], addr[2]);
}

/* Prints an identifier line, which will support debugging. */
static int scnprint_id(struct zd_chip *chip, char *buffer, size_t size)
{
        int i = 0;

        i = scnprintf(buffer, size, "zd1211%s chip ",
                      zd_chip_is_zd1211b(chip) ? "b" : "");
        i += zd_usb_scnprint_id(&chip->usb, buffer+i, size-i);
        i += scnprintf(buffer+i, size-i, " ");
        i += scnprint_mac_oui(chip, buffer+i, size-i);
        i += scnprintf(buffer+i, size-i, " ");
        i += zd_rf_scnprint_id(&chip->rf, buffer+i, size-i);
        i += scnprintf(buffer+i, size-i, " pa%1x %c%c%c%c%c", chip->pa_type,
                chip->patch_cck_gain ? 'g' : '-',
                chip->patch_cr157 ? '7' : '-',
                chip->patch_6m_band_edge ? '6' : '-',
                chip->new_phy_layout ? 'N' : '-',
                chip->al2230s_bit ? 'S' : '-');
        return i;
}

static void print_id(struct zd_chip *chip)
{
        char buffer[80];

        scnprint_id(chip, buffer, sizeof(buffer));
        buffer[sizeof(buffer)-1] = 0;
        dev_info(zd_chip_dev(chip), "%s\n", buffer);
}

static zd_addr_t inc_addr(zd_addr_t addr)
{
        u16 a = (u16)addr;
        /* Control registers use byte addressing, but everything else uses word
         * addressing. */
        if ((a & 0xf000) == CR_START)
                a += 2;
        else
                a += 1;
        return (zd_addr_t)a;
}

/* Read a variable number of 32-bit values. Parameter count is not allowed to
 * exceed USB_MAX_IOREAD32_COUNT.
 */
int zd_ioread32v_locked(struct zd_chip *chip, u32 *values, const zd_addr_t *addr,
                 unsigned int count)
{
        int r;
        int i;
        zd_addr_t a16[USB_MAX_IOREAD32_COUNT * 2];
        u16 v16[USB_MAX_IOREAD32_COUNT * 2];
        unsigned int count16;

        if (count > USB_MAX_IOREAD32_COUNT)
                return -EINVAL;

        /* Use stack for values and addresses. */
        count16 = 2 * count;
        BUG_ON(count16 * sizeof(zd_addr_t) > sizeof(a16));
        BUG_ON(count16 * sizeof(u16) > sizeof(v16));

        for (i = 0; i < count; i++) {
                int j = 2*i;
                /* We read the high word always first. */
                a16[j] = inc_addr(addr[i]);
                a16[j+1] = addr[i];
        }

        r = zd_ioread16v_locked(chip, v16, a16, count16);
        if (r) {
                dev_dbg_f(zd_chip_dev(chip),
                          "error: %s. Error number %d\n", __func__, r);
                return r;
        }

        for (i = 0; i < count; i++) {
                int j = 2*i;
                values[i] = (v16[j] << 16) | v16[j+1];
        }

        return 0;
}

static int _zd_iowrite32v_async_locked(struct zd_chip *chip,
                                       const struct zd_ioreq32 *ioreqs,
                                       unsigned int count)
{
        int i, j, r;
        struct zd_ioreq16 ioreqs16[USB_MAX_IOWRITE32_COUNT * 2];
        unsigned int count16;

        /* Use stack for values and addresses. */

        ZD_ASSERT(mutex_is_locked(&chip->mutex));

        if (count == 0)
                return 0;
        if (count > USB_MAX_IOWRITE32_COUNT)
                return -EINVAL;

        count16 = 2 * count;
        BUG_ON(count16 * sizeof(struct zd_ioreq16) > sizeof(ioreqs16));

        for (i = 0; i < count; i++) {
                j = 2*i;
                /* We write the high word always first. */
                ioreqs16[j].value   = ioreqs[i].value >> 16;
                ioreqs16[j].addr    = inc_addr(ioreqs[i].addr);
                ioreqs16[j+1].value = ioreqs[i].value;
                ioreqs16[j+1].addr  = ioreqs[i].addr;
        }

        r = zd_usb_iowrite16v_async(&chip->usb, ioreqs16, count16);
#ifdef DEBUG
        if (r) {
                dev_dbg_f(zd_chip_dev(chip),
                          "error %d in zd_usb_write16v\n", r);
        }
#endif /* DEBUG */
        return r;
}

int _zd_iowrite32v_locked(struct zd_chip *chip, const struct zd_ioreq32 *ioreqs,
                          unsigned int count)
{
        int r;

        zd_usb_iowrite16v_async_start(&chip->usb);
        r = _zd_iowrite32v_async_locked(chip, ioreqs, count);
        if (r) {
                zd_usb_iowrite16v_async_end(&chip->usb, 0);
                return r;
        }
        return zd_usb_iowrite16v_async_end(&chip->usb, 50 /* ms */);
}

int zd_iowrite16a_locked(struct zd_chip *chip,
                  const struct zd_ioreq16 *ioreqs, unsigned int count)
{
        int r;
        unsigned int i, j, t, max;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        zd_usb_iowrite16v_async_start(&chip->usb);

        for (i = 0; i < count; i += j + t) {
                t = 0;
                max = count-i;
                if (max > USB_MAX_IOWRITE16_COUNT)
                        max = USB_MAX_IOWRITE16_COUNT;
                for (j = 0; j < max; j++) {
                        if (!ioreqs[i+j].addr) {
                                t = 1;
                                break;
                        }
                }

                r = zd_usb_iowrite16v_async(&chip->usb, &ioreqs[i], j);
                if (r) {
                        zd_usb_iowrite16v_async_end(&chip->usb, 0);
                        dev_dbg_f(zd_chip_dev(chip),
                                  "error zd_usb_iowrite16v. Error number %d\n",
                                  r);
                        return r;
                }
        }

        return zd_usb_iowrite16v_async_end(&chip->usb, 50 /* ms */);
}

/* Writes a variable number of 32 bit registers. The functions will split
 * that in several USB requests. A split can be forced by inserting an IO
 * request with an zero address field.
 */
int zd_iowrite32a_locked(struct zd_chip *chip,
                  const struct zd_ioreq32 *ioreqs, unsigned int count)
{
        int r;
        unsigned int i, j, t, max;

        zd_usb_iowrite16v_async_start(&chip->usb);

        for (i = 0; i < count; i += j + t) {
                t = 0;
                max = count-i;
                if (max > USB_MAX_IOWRITE32_COUNT)
                        max = USB_MAX_IOWRITE32_COUNT;
                for (j = 0; j < max; j++) {
                        if (!ioreqs[i+j].addr) {
                                t = 1;
                                break;
                        }
                }

                r = _zd_iowrite32v_async_locked(chip, &ioreqs[i], j);
                if (r) {
                        zd_usb_iowrite16v_async_end(&chip->usb, 0);
                        dev_dbg_f(zd_chip_dev(chip),
                                "error _%s. Error number %d\n", __func__,
                                r);
                        return r;
                }
        }

        return zd_usb_iowrite16v_async_end(&chip->usb, 50 /* ms */);
}

int zd_ioread16(struct zd_chip *chip, zd_addr_t addr, u16 *value)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_ioread16_locked(chip, value, addr);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_ioread32(struct zd_chip *chip, zd_addr_t addr, u32 *value)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_ioread32_locked(chip, value, addr);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_iowrite16(struct zd_chip *chip, zd_addr_t addr, u16 value)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_iowrite16_locked(chip, value, addr);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_iowrite32(struct zd_chip *chip, zd_addr_t addr, u32 value)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_iowrite32_locked(chip, value, addr);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_ioread32v(struct zd_chip *chip, const zd_addr_t *addresses,
                  u32 *values, unsigned int count)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_ioread32v_locked(chip, values, addresses, count);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_iowrite32a(struct zd_chip *chip, const struct zd_ioreq32 *ioreqs,
                  unsigned int count)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_iowrite32a_locked(chip, ioreqs, count);
        mutex_unlock(&chip->mutex);
        return r;
}

static int read_pod(struct zd_chip *chip, u8 *rf_type)
{
        int r;
        u32 value;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = zd_ioread32_locked(chip, &value, E2P_POD);
        if (r)
                goto error;
        dev_dbg_f(zd_chip_dev(chip), "E2P_POD %#010x\n", value);

        /* FIXME: AL2230 handling (Bit 7 in POD) */
        *rf_type = value & 0x0f;
        chip->pa_type = (value >> 16) & 0x0f;
        chip->patch_cck_gain = (value >> 8) & 0x1;
        chip->patch_cr157 = (value >> 13) & 0x1;
        chip->patch_6m_band_edge = (value >> 21) & 0x1;
        chip->new_phy_layout = (value >> 31) & 0x1;
        chip->al2230s_bit = (value >> 7) & 0x1;
        chip->link_led = ((value >> 4) & 1) ? LED1 : LED2;
        chip->supports_tx_led = 1;
        if (value & (1 << 24)) { /* LED scenario */
                if (value & (1 << 29))
                        chip->supports_tx_led = 0;
        }

        dev_dbg_f(zd_chip_dev(chip),
                "RF %s %#01x PA type %#01x patch CCK %d patch CR157 %d "
                "patch 6M %d new PHY %d link LED%d tx led %d\n",
                zd_rf_name(*rf_type), *rf_type,
                chip->pa_type, chip->patch_cck_gain,
                chip->patch_cr157, chip->patch_6m_band_edge,
                chip->new_phy_layout,
                chip->link_led == LED1 ? 1 : 2,
                chip->supports_tx_led);
        return 0;
error:
        *rf_type = 0;
        chip->pa_type = 0;
        chip->patch_cck_gain = 0;
        chip->patch_cr157 = 0;
        chip->patch_6m_band_edge = 0;
        chip->new_phy_layout = 0;
        return r;
}

static int zd_write_mac_addr_common(struct zd_chip *chip, const u8 *mac_addr,
                                    const struct zd_ioreq32 *in_reqs,
                                    const char *type)
{
        int r;
        struct zd_ioreq32 reqs[2] = {in_reqs[0], in_reqs[1]};

        if (mac_addr) {
                reqs[0].value = (mac_addr[3] << 24)
                              | (mac_addr[2] << 16)
                              | (mac_addr[1] <<  8)
                              |  mac_addr[0];
                reqs[1].value = (mac_addr[5] <<  8)
                              |  mac_addr[4];
                dev_dbg_f(zd_chip_dev(chip), "%s addr %pM\n", type, mac_addr);
        } else {
                dev_dbg_f(zd_chip_dev(chip), "set NULL %s\n", type);
        }

        mutex_lock(&chip->mutex);
        r = zd_iowrite32a_locked(chip, reqs, ARRAY_SIZE(reqs));
        mutex_unlock(&chip->mutex);
        return r;
}

/* MAC address: if custom mac addresses are to be used CR_MAC_ADDR_P1 and
 *              CR_MAC_ADDR_P2 must be overwritten
 */
int zd_write_mac_addr(struct zd_chip *chip, const u8 *mac_addr)
{
        static const struct zd_ioreq32 reqs[2] = {
                [0] = { .addr = CR_MAC_ADDR_P1 },
                [1] = { .addr = CR_MAC_ADDR_P2 },
        };

        return zd_write_mac_addr_common(chip, mac_addr, reqs, "mac");
}

int zd_write_bssid(struct zd_chip *chip, const u8 *bssid)
{
        static const struct zd_ioreq32 reqs[2] = {
                [0] = { .addr = CR_BSSID_P1 },
                [1] = { .addr = CR_BSSID_P2 },
        };

        return zd_write_mac_addr_common(chip, bssid, reqs, "bssid");
}

int zd_read_regdomain(struct zd_chip *chip, u8 *regdomain)
{
        int r;
        u32 value;

        mutex_lock(&chip->mutex);
        r = zd_ioread32_locked(chip, &value, E2P_SUBID);
        mutex_unlock(&chip->mutex);
        if (r)
                return r;

        *regdomain = value >> 16;
        dev_dbg_f(zd_chip_dev(chip), "regdomain: %#04x\n", *regdomain);

        return 0;
}

static int read_values(struct zd_chip *chip, u8 *values, size_t count,
                       zd_addr_t e2p_addr, u32 guard)
{
        int r;
        int i;
        u32 v;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        for (i = 0;;) {
                r = zd_ioread32_locked(chip, &v,
                                       (zd_addr_t)((u16)e2p_addr+i/2));
                if (r)
                        return r;
                v -= guard;
                if (i+4 < count) {
                        values[i++] = v;
                        values[i++] = v >>  8;
                        values[i++] = v >> 16;
                        values[i++] = v >> 24;
                        continue;
                }
                for (;i < count; i++)
                        values[i] = v >> (8*(i%3));
                return 0;
        }
}

static int read_pwr_cal_values(struct zd_chip *chip)
{
        return read_values(chip, chip->pwr_cal_values,
                        E2P_CHANNEL_COUNT, E2P_PWR_CAL_VALUE1,
                        0);
}

static int read_pwr_int_values(struct zd_chip *chip)
{
        return read_values(chip, chip->pwr_int_values,
                        E2P_CHANNEL_COUNT, E2P_PWR_INT_VALUE1,
                        E2P_PWR_INT_GUARD);
}

static int read_ofdm_cal_values(struct zd_chip *chip)
{
        int r;
        int i;
        static const zd_addr_t addresses[] = {
                E2P_36M_CAL_VALUE1,
                E2P_48M_CAL_VALUE1,
                E2P_54M_CAL_VALUE1,
        };

        for (i = 0; i < 3; i++) {
                r = read_values(chip, chip->ofdm_cal_values[i],
                                E2P_CHANNEL_COUNT, addresses[i], 0);
                if (r)
                        return r;
        }
        return 0;
}

static int read_cal_int_tables(struct zd_chip *chip)
{
        int r;

        r = read_pwr_cal_values(chip);
        if (r)
                return r;
        r = read_pwr_int_values(chip);
        if (r)
                return r;
        r = read_ofdm_cal_values(chip);
        if (r)
                return r;
        return 0;
}

/* phy means physical registers */
int zd_chip_lock_phy_regs(struct zd_chip *chip)
{
        int r;
        u32 tmp;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = zd_ioread32_locked(chip, &tmp, CR_REG1);
        if (r) {
                dev_err(zd_chip_dev(chip), "error ioread32(CR_REG1): %d\n", r);
                return r;
        }

        tmp &= ~UNLOCK_PHY_REGS;

        r = zd_iowrite32_locked(chip, tmp, CR_REG1);
        if (r)
                dev_err(zd_chip_dev(chip), "error iowrite32(CR_REG1): %d\n", r);
        return r;
}

int zd_chip_unlock_phy_regs(struct zd_chip *chip)
{
        int r;
        u32 tmp;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = zd_ioread32_locked(chip, &tmp, CR_REG1);
        if (r) {
                dev_err(zd_chip_dev(chip),
                        "error ioread32(CR_REG1): %d\n", r);
                return r;
        }

        tmp |= UNLOCK_PHY_REGS;

        r = zd_iowrite32_locked(chip, tmp, CR_REG1);
        if (r)
                dev_err(zd_chip_dev(chip), "error iowrite32(CR_REG1): %d\n", r);
        return r;
}

/* ZD_CR157 can be optionally patched by the EEPROM for original ZD1211 */
static int patch_cr157(struct zd_chip *chip)
{
        int r;
        u16 value;

        if (!chip->patch_cr157)
                return 0;

        r = zd_ioread16_locked(chip, &value, E2P_PHY_REG);
        if (r)
                return r;

        dev_dbg_f(zd_chip_dev(chip), "patching value %x\n", value >> 8);
        return zd_iowrite32_locked(chip, value >> 8, ZD_CR157);
}

/*
 * 6M band edge can be optionally overwritten for certain RF's
 * Vendor driver says: for FCC regulation, enabled per HWFeature 6M band edge
 * bit (for AL2230, AL2230S)
 */
static int patch_6m_band_edge(struct zd_chip *chip, u8 channel)
{
        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        if (!chip->patch_6m_band_edge)
                return 0;

        return zd_rf_patch_6m_band_edge(&chip->rf, channel);
}

/* Generic implementation of 6M band edge patching, used by most RFs via
 * zd_rf_generic_patch_6m() */
int zd_chip_generic_patch_6m_band(struct zd_chip *chip, int channel)
{
        struct zd_ioreq16 ioreqs[] = {
                { ZD_CR128, 0x14 }, { ZD_CR129, 0x12 }, { ZD_CR130, 0x10 },
                { ZD_CR47,  0x1e },
        };

        /* FIXME: Channel 11 is not the edge for all regulatory domains. */
        if (channel == 1 || channel == 11)
                ioreqs[0].value = 0x12;

        dev_dbg_f(zd_chip_dev(chip), "patching for channel %d\n", channel);
        return zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
}

static int zd1211_hw_reset_phy(struct zd_chip *chip)
{
        static const struct zd_ioreq16 ioreqs[] = {
                { ZD_CR0,   0x0a }, { ZD_CR1,   0x06 }, { ZD_CR2,   0x26 },
                { ZD_CR3,   0x38 }, { ZD_CR4,   0x80 }, { ZD_CR9,   0xa0 },
                { ZD_CR10,  0x81 }, { ZD_CR11,  0x00 }, { ZD_CR12,  0x7f },
                { ZD_CR13,  0x8c }, { ZD_CR14,  0x80 }, { ZD_CR15,  0x3d },
                { ZD_CR16,  0x20 }, { ZD_CR17,  0x1e }, { ZD_CR18,  0x0a },
                { ZD_CR19,  0x48 }, { ZD_CR20,  0x0c }, { ZD_CR21,  0x0c },
                { ZD_CR22,  0x23 }, { ZD_CR23,  0x90 }, { ZD_CR24,  0x14 },
                { ZD_CR25,  0x40 }, { ZD_CR26,  0x10 }, { ZD_CR27,  0x19 },
                { ZD_CR28,  0x7f }, { ZD_CR29,  0x80 }, { ZD_CR30,  0x4b },
                { ZD_CR31,  0x60 }, { ZD_CR32,  0x43 }, { ZD_CR33,  0x08 },
                { ZD_CR34,  0x06 }, { ZD_CR35,  0x0a }, { ZD_CR36,  0x00 },
                { ZD_CR37,  0x00 }, { ZD_CR38,  0x38 }, { ZD_CR39,  0x0c },
                { ZD_CR40,  0x84 }, { ZD_CR41,  0x2a }, { ZD_CR42,  0x80 },
                { ZD_CR43,  0x10 }, { ZD_CR44,  0x12 }, { ZD_CR46,  0xff },
                { ZD_CR47,  0x1E }, { ZD_CR48,  0x26 }, { ZD_CR49,  0x5b },
                { ZD_CR64,  0xd0 }, { ZD_CR65,  0x04 }, { ZD_CR66,  0x58 },
                { ZD_CR67,  0xc9 }, { ZD_CR68,  0x88 }, { ZD_CR69,  0x41 },
                { ZD_CR70,  0x23 }, { ZD_CR71,  0x10 }, { ZD_CR72,  0xff },
                { ZD_CR73,  0x32 }, { ZD_CR74,  0x30 }, { ZD_CR75,  0x65 },
                { ZD_CR76,  0x41 }, { ZD_CR77,  0x1b }, { ZD_CR78,  0x30 },
                { ZD_CR79,  0x68 }, { ZD_CR80,  0x64 }, { ZD_CR81,  0x64 },
                { ZD_CR82,  0x00 }, { ZD_CR83,  0x00 }, { ZD_CR84,  0x00 },
                { ZD_CR85,  0x02 }, { ZD_CR86,  0x00 }, { ZD_CR87,  0x00 },
                { ZD_CR88,  0xff }, { ZD_CR89,  0xfc }, { ZD_CR90,  0x00 },
                { ZD_CR91,  0x00 }, { ZD_CR92,  0x00 }, { ZD_CR93,  0x08 },
                { ZD_CR94,  0x00 }, { ZD_CR95,  0x00 }, { ZD_CR96,  0xff },
                { ZD_CR97,  0xe7 }, { ZD_CR98,  0x00 }, { ZD_CR99,  0x00 },
                { ZD_CR100, 0x00 }, { ZD_CR101, 0xae }, { ZD_CR102, 0x02 },
                { ZD_CR103, 0x00 }, { ZD_CR104, 0x03 }, { ZD_CR105, 0x65 },
                { ZD_CR106, 0x04 }, { ZD_CR107, 0x00 }, { ZD_CR108, 0x0a },
                { ZD_CR109, 0xaa }, { ZD_CR110, 0xaa }, { ZD_CR111, 0x25 },
                { ZD_CR112, 0x25 }, { ZD_CR113, 0x00 }, { ZD_CR119, 0x1e },
                { ZD_CR125, 0x90 }, { ZD_CR126, 0x00 }, { ZD_CR127, 0x00 },
                { },
                { ZD_CR5,   0x00 }, { ZD_CR6,   0x00 }, { ZD_CR7,   0x00 },
                { ZD_CR8,   0x00 }, { ZD_CR9,   0x20 }, { ZD_CR12,  0xf0 },
                { ZD_CR20,  0x0e }, { ZD_CR21,  0x0e }, { ZD_CR27,  0x10 },
                { ZD_CR44,  0x33 }, { ZD_CR47,  0x1E }, { ZD_CR83,  0x24 },
                { ZD_CR84,  0x04 }, { ZD_CR85,  0x00 }, { ZD_CR86,  0x0C },
                { ZD_CR87,  0x12 }, { ZD_CR88,  0x0C }, { ZD_CR89,  0x00 },
                { ZD_CR90,  0x10 }, { ZD_CR91,  0x08 }, { ZD_CR93,  0x00 },
                { ZD_CR94,  0x01 }, { ZD_CR95,  0x00 }, { ZD_CR96,  0x50 },
                { ZD_CR97,  0x37 }, { ZD_CR98,  0x35 }, { ZD_CR101, 0x13 },
                { ZD_CR102, 0x27 }, { ZD_CR103, 0x27 }, { ZD_CR104, 0x18 },
                { ZD_CR105, 0x12 }, { ZD_CR109, 0x27 }, { ZD_CR110, 0x27 },
                { ZD_CR111, 0x27 }, { ZD_CR112, 0x27 }, { ZD_CR113, 0x27 },
                { ZD_CR114, 0x27 }, { ZD_CR115, 0x26 }, { ZD_CR116, 0x24 },
                { ZD_CR117, 0xfc }, { ZD_CR118, 0xfa }, { ZD_CR120, 0x4f },
                { ZD_CR125, 0xaa }, { ZD_CR127, 0x03 }, { ZD_CR128, 0x14 },
                { ZD_CR129, 0x12 }, { ZD_CR130, 0x10 }, { ZD_CR131, 0x0C },
                { ZD_CR136, 0xdf }, { ZD_CR137, 0x40 }, { ZD_CR138, 0xa0 },
                { ZD_CR139, 0xb0 }, { ZD_CR140, 0x99 }, { ZD_CR141, 0x82 },
                { ZD_CR142, 0x54 }, { ZD_CR143, 0x1c }, { ZD_CR144, 0x6c },
                { ZD_CR147, 0x07 }, { ZD_CR148, 0x4c }, { ZD_CR149, 0x50 },
                { ZD_CR150, 0x0e }, { ZD_CR151, 0x18 }, { ZD_CR160, 0xfe },
                { ZD_CR161, 0xee }, { ZD_CR162, 0xaa }, { ZD_CR163, 0xfa },
                { ZD_CR164, 0xfa }, { ZD_CR165, 0xea }, { ZD_CR166, 0xbe },
                { ZD_CR167, 0xbe }, { ZD_CR168, 0x6a }, { ZD_CR169, 0xba },
                { ZD_CR170, 0xba }, { ZD_CR171, 0xba },
                /* Note: ZD_CR204 must lead the ZD_CR203 */
                { ZD_CR204, 0x7d },
                { },
                { ZD_CR203, 0x30 },
        };

        int r, t;

        dev_dbg_f(zd_chip_dev(chip), "\n");

        r = zd_chip_lock_phy_regs(chip);
        if (r)
                goto out;

        r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
        if (r)
                goto unlock;

        r = patch_cr157(chip);
unlock:
        t = zd_chip_unlock_phy_regs(chip);
        if (t && !r)
                r = t;
out:
        return r;
}

static int zd1211b_hw_reset_phy(struct zd_chip *chip)
{
        static const struct zd_ioreq16 ioreqs[] = {
                { ZD_CR0,   0x14 }, { ZD_CR1,   0x06 }, { ZD_CR2,   0x26 },
                { ZD_CR3,   0x38 }, { ZD_CR4,   0x80 }, { ZD_CR9,   0xe0 },
                { ZD_CR10,  0x81 },
                /* power control { { ZD_CR11,  1 << 6 }, */
                { ZD_CR11,  0x00 },
                { ZD_CR12,  0xf0 }, { ZD_CR13,  0x8c }, { ZD_CR14,  0x80 },
                { ZD_CR15,  0x3d }, { ZD_CR16,  0x20 }, { ZD_CR17,  0x1e },
                { ZD_CR18,  0x0a }, { ZD_CR19,  0x48 },
                { ZD_CR20,  0x10 }, /* Org:0x0E, ComTrend:RalLink AP */
                { ZD_CR21,  0x0e }, { ZD_CR22,  0x23 }, { ZD_CR23,  0x90 },
                { ZD_CR24,  0x14 }, { ZD_CR25,  0x40 }, { ZD_CR26,  0x10 },
                { ZD_CR27,  0x10 }, { ZD_CR28,  0x7f }, { ZD_CR29,  0x80 },
                { ZD_CR30,  0x4b }, /* ASIC/FWT, no jointly decoder */
                { ZD_CR31,  0x60 }, { ZD_CR32,  0x43 }, { ZD_CR33,  0x08 },
                { ZD_CR34,  0x06 }, { ZD_CR35,  0x0a }, { ZD_CR36,  0x00 },
                { ZD_CR37,  0x00 }, { ZD_CR38,  0x38 }, { ZD_CR39,  0x0c },
                { ZD_CR40,  0x84 }, { ZD_CR41,  0x2a }, { ZD_CR42,  0x80 },
                { ZD_CR43,  0x10 }, { ZD_CR44,  0x33 }, { ZD_CR46,  0xff },
                { ZD_CR47,  0x1E }, { ZD_CR48,  0x26 }, { ZD_CR49,  0x5b },
                { ZD_CR64,  0xd0 }, { ZD_CR65,  0x04 }, { ZD_CR66,  0x58 },
                { ZD_CR67,  0xc9 }, { ZD_CR68,  0x88 }, { ZD_CR69,  0x41 },
                { ZD_CR70,  0x23 }, { ZD_CR71,  0x10 }, { ZD_CR72,  0xff },
                { ZD_CR73,  0x32 }, { ZD_CR74,  0x30 }, { ZD_CR75,  0x65 },
                { ZD_CR76,  0x41 }, { ZD_CR77,  0x1b }, { ZD_CR78,  0x30 },
                { ZD_CR79,  0xf0 }, { ZD_CR80,  0x64 }, { ZD_CR81,  0x64 },
                { ZD_CR82,  0x00 }, { ZD_CR83,  0x24 }, { ZD_CR84,  0x04 },
                { ZD_CR85,  0x00 }, { ZD_CR86,  0x0c }, { ZD_CR87,  0x12 },
                { ZD_CR88,  0x0c }, { ZD_CR89,  0x00 }, { ZD_CR90,  0x58 },
                { ZD_CR91,  0x04 }, { ZD_CR92,  0x00 }, { ZD_CR93,  0x00 },
                { ZD_CR94,  0x01 },
                { ZD_CR95,  0x20 }, /* ZD1211B */
                { ZD_CR96,  0x50 }, { ZD_CR97,  0x37 }, { ZD_CR98,  0x35 },
                { ZD_CR99,  0x00 }, { ZD_CR100, 0x01 }, { ZD_CR101, 0x13 },
                { ZD_CR102, 0x27 }, { ZD_CR103, 0x27 }, { ZD_CR104, 0x18 },
                { ZD_CR105, 0x12 }, { ZD_CR106, 0x04 }, { ZD_CR107, 0x00 },
                { ZD_CR108, 0x0a }, { ZD_CR109, 0x27 }, { ZD_CR110, 0x27 },
                { ZD_CR111, 0x27 }, { ZD_CR112, 0x27 }, { ZD_CR113, 0x27 },
                { ZD_CR114, 0x27 }, { ZD_CR115, 0x26 }, { ZD_CR116, 0x24 },
                { ZD_CR117, 0xfc }, { ZD_CR118, 0xfa }, { ZD_CR119, 0x1e },
                { ZD_CR125, 0x90 }, { ZD_CR126, 0x00 }, { ZD_CR127, 0x00 },
                { ZD_CR128, 0x14 }, { ZD_CR129, 0x12 }, { ZD_CR130, 0x10 },
                { ZD_CR131, 0x0c }, { ZD_CR136, 0xdf }, { ZD_CR137, 0xa0 },
                { ZD_CR138, 0xa8 }, { ZD_CR139, 0xb4 }, { ZD_CR140, 0x98 },
                { ZD_CR141, 0x82 }, { ZD_CR142, 0x53 }, { ZD_CR143, 0x1c },
                { ZD_CR144, 0x6c }, { ZD_CR147, 0x07 }, { ZD_CR148, 0x40 },
                { ZD_CR149, 0x40 }, /* Org:0x50 ComTrend:RalLink AP */
                { ZD_CR150, 0x14 }, /* Org:0x0E ComTrend:RalLink AP */
                { ZD_CR151, 0x18 }, { ZD_CR159, 0x70 }, { ZD_CR160, 0xfe },
                { ZD_CR161, 0xee }, { ZD_CR162, 0xaa }, { ZD_CR163, 0xfa },
                { ZD_CR164, 0xfa }, { ZD_CR165, 0xea }, { ZD_CR166, 0xbe },
                { ZD_CR167, 0xbe }, { ZD_CR168, 0x6a }, { ZD_CR169, 0xba },
                { ZD_CR170, 0xba }, { ZD_CR171, 0xba },
                /* Note: ZD_CR204 must lead the ZD_CR203 */
                { ZD_CR204, 0x7d },
                {},
                { ZD_CR203, 0x30 },
        };

        int r, t;

        dev_dbg_f(zd_chip_dev(chip), "\n");

        r = zd_chip_lock_phy_regs(chip);
        if (r)
                goto out;

        r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
        t = zd_chip_unlock_phy_regs(chip);
        if (t && !r)
                r = t;
out:
        return r;
}

static int hw_reset_phy(struct zd_chip *chip)
{
        return zd_chip_is_zd1211b(chip) ? zd1211b_hw_reset_phy(chip) :
                                  zd1211_hw_reset_phy(chip);
}

static int zd1211_hw_init_hmac(struct zd_chip *chip)
{
        static const struct zd_ioreq32 ioreqs[] = {
                { CR_ZD1211_RETRY_MAX,          ZD1211_RETRY_COUNT },
                { CR_RX_THRESHOLD,              0x000c0640 },
        };

        dev_dbg_f(zd_chip_dev(chip), "\n");
        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        return zd_iowrite32a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
}

static int zd1211b_hw_init_hmac(struct zd_chip *chip)
{
        static const struct zd_ioreq32 ioreqs[] = {
                { CR_ZD1211B_RETRY_MAX,         ZD1211B_RETRY_COUNT },
                { CR_ZD1211B_CWIN_MAX_MIN_AC0,  0x007f003f },
                { CR_ZD1211B_CWIN_MAX_MIN_AC1,  0x007f003f },
                { CR_ZD1211B_CWIN_MAX_MIN_AC2,  0x003f001f },
                { CR_ZD1211B_CWIN_MAX_MIN_AC3,  0x001f000f },
                { CR_ZD1211B_AIFS_CTL1,         0x00280028 },
                { CR_ZD1211B_AIFS_CTL2,         0x008C003C },
                { CR_ZD1211B_TXOP,              0x01800824 },
                { CR_RX_THRESHOLD,              0x000c0eff, },
        };

        dev_dbg_f(zd_chip_dev(chip), "\n");
        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        return zd_iowrite32a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
}

static int hw_init_hmac(struct zd_chip *chip)
{
        int r;
        static const struct zd_ioreq32 ioreqs[] = {
                { CR_ACK_TIMEOUT_EXT,           0x20 },
                { CR_ADDA_MBIAS_WARMTIME,       0x30000808 },
                { CR_SNIFFER_ON,                0 },
                { CR_RX_FILTER,                 STA_RX_FILTER },
                { CR_GROUP_HASH_P1,             0x00 },
                { CR_GROUP_HASH_P2,             0x80000000 },
                { CR_REG1,                      0xa4 },
                { CR_ADDA_PWR_DWN,              0x7f },
                { CR_BCN_PLCP_CFG,              0x00f00401 },
                { CR_PHY_DELAY,                 0x00 },
                { CR_ACK_TIMEOUT_EXT,           0x80 },
                { CR_ADDA_PWR_DWN,              0x00 },
                { CR_ACK_TIME_80211,            0x100 },
                { CR_RX_PE_DELAY,               0x70 },
                { CR_PS_CTRL,                   0x10000000 },
                { CR_RTS_CTS_RATE,              0x02030203 },
                { CR_AFTER_PNP,                 0x1 },
                { CR_WEP_PROTECT,               0x114 },
                { CR_IFS_VALUE,                 IFS_VALUE_DEFAULT },
                { CR_CAM_MODE,                  MODE_AP_WDS},
        };

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = zd_iowrite32a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
        if (r)
                return r;

        return zd_chip_is_zd1211b(chip) ?
                zd1211b_hw_init_hmac(chip) : zd1211_hw_init_hmac(chip);
}

struct aw_pt_bi {
        u32 atim_wnd_period;
        u32 pre_tbtt;
        u32 beacon_interval;
};

static int get_aw_pt_bi(struct zd_chip *chip, struct aw_pt_bi *s)
{
        int r;
        static const zd_addr_t aw_pt_bi_addr[] =
                { CR_ATIM_WND_PERIOD, CR_PRE_TBTT, CR_BCN_INTERVAL };
        u32 values[3];

        r = zd_ioread32v_locked(chip, values, (const zd_addr_t *)aw_pt_bi_addr,
                         ARRAY_SIZE(aw_pt_bi_addr));
        if (r) {
                memset(s, 0, sizeof(*s));
                return r;
        }

        s->atim_wnd_period = values[0];
        s->pre_tbtt = values[1];
        s->beacon_interval = values[2];
        return 0;
}

static int set_aw_pt_bi(struct zd_chip *chip, struct aw_pt_bi *s)
{
        struct zd_ioreq32 reqs[3];
        u16 b_interval = s->beacon_interval & 0xffff;

        if (b_interval <= 5)
                b_interval = 5;
        if (s->pre_tbtt < 4 || s->pre_tbtt >= b_interval)
                s->pre_tbtt = b_interval - 1;
        if (s->atim_wnd_period >= s->pre_tbtt)
                s->atim_wnd_period = s->pre_tbtt - 1;

        reqs[0].addr = CR_ATIM_WND_PERIOD;
        reqs[0].value = s->atim_wnd_period;
        reqs[1].addr = CR_PRE_TBTT;
        reqs[1].value = s->pre_tbtt;
        reqs[2].addr = CR_BCN_INTERVAL;
        reqs[2].value = (s->beacon_interval & ~0xffff) | b_interval;

        return zd_iowrite32a_locked(chip, reqs, ARRAY_SIZE(reqs));
}


static int set_beacon_interval(struct zd_chip *chip, u16 interval,
                               u8 dtim_period, int type)
{
        int r;
        struct aw_pt_bi s;
        u32 b_interval, mode_flag;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));

        if (interval > 0) {
                switch (type) {
                case NL80211_IFTYPE_ADHOC:
                case NL80211_IFTYPE_MESH_POINT:
                        mode_flag = BCN_MODE_IBSS;
                        break;
                case NL80211_IFTYPE_AP:
                        mode_flag = BCN_MODE_AP;
                        break;
                default:
                        mode_flag = 0;
                        break;
                }
        } else {
                dtim_period = 0;
                mode_flag = 0;
        }

        b_interval = mode_flag | (dtim_period << 16) | interval;

        r = zd_iowrite32_locked(chip, b_interval, CR_BCN_INTERVAL);
        if (r)
                return r;
        r = get_aw_pt_bi(chip, &s);
        if (r)
                return r;
        return set_aw_pt_bi(chip, &s);
}

int zd_set_beacon_interval(struct zd_chip *chip, u16 interval, u8 dtim_period,
                           int type)
{
        int r;

        mutex_lock(&chip->mutex);
        r = set_beacon_interval(chip, interval, dtim_period, type);
        mutex_unlock(&chip->mutex);
        return r;
}

static int hw_init(struct zd_chip *chip)
{
        int r;

        dev_dbg_f(zd_chip_dev(chip), "\n");
        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = hw_reset_phy(chip);
        if (r)
                return r;

        r = hw_init_hmac(chip);
        if (r)
                return r;

        return set_beacon_interval(chip, 100, 0, NL80211_IFTYPE_UNSPECIFIED);
}

static zd_addr_t fw_reg_addr(struct zd_chip *chip, u16 offset)
{
        return (zd_addr_t)((u16)chip->fw_regs_base + offset);
}

#ifdef DEBUG
static int dump_cr(struct zd_chip *chip, const zd_addr_t addr,
                   const char *addr_string)
{
        int r;
        u32 value;

        r = zd_ioread32_locked(chip, &value, addr);
        if (r) {
                dev_dbg_f(zd_chip_dev(chip),
                        "error reading %s. Error number %d\n", addr_string, r);
                return r;
        }

        dev_dbg_f(zd_chip_dev(chip), "%s %#010x\n",
                addr_string, (unsigned int)value);
        return 0;
}

static int test_init(struct zd_chip *chip)
{
        int r;

        r = dump_cr(chip, CR_AFTER_PNP, "CR_AFTER_PNP");
        if (r)
                return r;
        r = dump_cr(chip, CR_GPI_EN, "CR_GPI_EN");
        if (r)
                return r;
        return dump_cr(chip, CR_INTERRUPT, "CR_INTERRUPT");
}

static void dump_fw_registers(struct zd_chip *chip)
{
        const zd_addr_t addr[4] = {
                fw_reg_addr(chip, FW_REG_FIRMWARE_VER),

                fw_reg_addr(chip, FW_REG_USB_SPEED),
                fw_reg_addr(chip, FW_REG_FIX_TX_RATE),
                fw_reg_addr(chip, FW_REG_LED_LINK_STATUS),
        };

        int r;
        u16 values[4];

        r = zd_ioread16v_locked(chip, values, (const zd_addr_t*)addr,
                         ARRAY_SIZE(addr));
        if (r) {
                dev_dbg_f(zd_chip_dev(chip), "error %d zd_ioread16v_locked\n",
                         r);
                return;
        }

        dev_dbg_f(zd_chip_dev(chip), "FW_FIRMWARE_VER %#06hx\n", values[0]);
        dev_dbg_f(zd_chip_dev(chip), "FW_USB_SPEED %#06hx\n", values[1]);
        dev_dbg_f(zd_chip_dev(chip), "FW_FIX_TX_RATE %#06hx\n", values[2]);
        dev_dbg_f(zd_chip_dev(chip), "FW_LINK_STATUS %#06hx\n", values[3]);
}
#endif /* DEBUG */

static int print_fw_version(struct zd_chip *chip)
{
        struct wiphy *wiphy = zd_chip_to_mac(chip)->hw->wiphy;
        int r;
        u16 version;

        r = zd_ioread16_locked(chip, &version,
                fw_reg_addr(chip, FW_REG_FIRMWARE_VER));
        if (r)
                return r;

        dev_info(zd_chip_dev(chip),"firmware version %04hx\n", version);

        snprintf(wiphy->fw_version, sizeof(wiphy->fw_version),
                        "%04hx", version);

        return 0;
}

static int set_mandatory_rates(struct zd_chip *chip, int gmode)
{
        u32 rates;
        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        /* This sets the mandatory rates, which only depend from the standard
         * that the device is supporting. Until further notice we should try
         * to support 802.11g also for full speed USB.
         */
        if (!gmode)
                rates = CR_RATE_1M|CR_RATE_2M|CR_RATE_5_5M|CR_RATE_11M;
        else
                rates = CR_RATE_1M|CR_RATE_2M|CR_RATE_5_5M|CR_RATE_11M|
                        CR_RATE_6M|CR_RATE_12M|CR_RATE_24M;

        return zd_iowrite32_locked(chip, rates, CR_MANDATORY_RATE_TBL);
}

int zd_chip_set_rts_cts_rate_locked(struct zd_chip *chip,
                                    int preamble)
{
        u32 value = 0;

        dev_dbg_f(zd_chip_dev(chip), "preamble=%x\n", preamble);
        value |= preamble << RTSCTS_SH_RTS_PMB_TYPE;
        value |= preamble << RTSCTS_SH_CTS_PMB_TYPE;

        /* We always send 11M RTS/self-CTS messages, like the vendor driver. */
        value |= ZD_PURE_RATE(ZD_CCK_RATE_11M) << RTSCTS_SH_RTS_RATE;
        value |= ZD_RX_CCK << RTSCTS_SH_RTS_MOD_TYPE;
        value |= ZD_PURE_RATE(ZD_CCK_RATE_11M) << RTSCTS_SH_CTS_RATE;
        value |= ZD_RX_CCK << RTSCTS_SH_CTS_MOD_TYPE;

        return zd_iowrite32_locked(chip, value, CR_RTS_CTS_RATE);
}

int zd_chip_enable_hwint(struct zd_chip *chip)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_iowrite32_locked(chip, HWINT_ENABLED, CR_INTERRUPT);
        mutex_unlock(&chip->mutex);
        return r;
}

static int disable_hwint(struct zd_chip *chip)
{
        return zd_iowrite32_locked(chip, HWINT_DISABLED, CR_INTERRUPT);
}

int zd_chip_disable_hwint(struct zd_chip *chip)
{
        int r;

        mutex_lock(&chip->mutex);
        r = disable_hwint(chip);
        mutex_unlock(&chip->mutex);
        return r;
}

static int read_fw_regs_offset(struct zd_chip *chip)
{
        int r;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = zd_ioread16_locked(chip, (u16*)&chip->fw_regs_base,
                               FWRAW_REGS_ADDR);
        if (r)
                return r;
        dev_dbg_f(zd_chip_dev(chip), "fw_regs_base: %#06hx\n",
                  (u16)chip->fw_regs_base);

        return 0;
}

/* Read mac address using pre-firmware interface */
int zd_chip_read_mac_addr_fw(struct zd_chip *chip, u8 *addr)
{
        dev_dbg_f(zd_chip_dev(chip), "\n");
        return zd_usb_read_fw(&chip->usb, E2P_MAC_ADDR_P1, addr,
                ETH_ALEN);
}

int zd_chip_init_hw(struct zd_chip *chip)
{
        int r;
        u8 rf_type;

        dev_dbg_f(zd_chip_dev(chip), "\n");

        mutex_lock(&chip->mutex);

#ifdef DEBUG
        r = test_init(chip);
        if (r)
                goto out;
#endif
        r = zd_iowrite32_locked(chip, 1, CR_AFTER_PNP);
        if (r)
                goto out;

        r = read_fw_regs_offset(chip);
        if (r)
                goto out;

        /* GPI is always disabled, also in the other driver.
         */
        r = zd_iowrite32_locked(chip, 0, CR_GPI_EN);
        if (r)
                goto out;
        r = zd_iowrite32_locked(chip, CWIN_SIZE, CR_CWMIN_CWMAX);
        if (r)
                goto out;
        /* Currently we support IEEE 802.11g for full and high speed USB.
         * It might be discussed, whether we should support pure b mode for
         * full speed USB.
         */
        r = set_mandatory_rates(chip, 1);
        if (r)
                goto out;
        /* Disabling interrupts is certainly a smart thing here.
         */
        r = disable_hwint(chip);
        if (r)
                goto out;
        r = read_pod(chip, &rf_type);
        if (r)
                goto out;
        r = hw_init(chip);
        if (r)
                goto out;
        r = zd_rf_init_hw(&chip->rf, rf_type);
        if (r)
                goto out;

        r = print_fw_version(chip);
        if (r)
                goto out;

#ifdef DEBUG
        dump_fw_registers(chip);
        r = test_init(chip);
        if (r)
                goto out;
#endif /* DEBUG */

        r = read_cal_int_tables(chip);
        if (r)
                goto out;

        print_id(chip);
out:
        mutex_unlock(&chip->mutex);
        return r;
}

static int update_pwr_int(struct zd_chip *chip, u8 channel)
{
        u8 value = chip->pwr_int_values[channel - 1];
        return zd_iowrite16_locked(chip, value, ZD_CR31);
}

static int update_pwr_cal(struct zd_chip *chip, u8 channel)
{
        u8 value = chip->pwr_cal_values[channel-1];
        return zd_iowrite16_locked(chip, value, ZD_CR68);
}

static int update_ofdm_cal(struct zd_chip *chip, u8 channel)
{
        struct zd_ioreq16 ioreqs[3];

        ioreqs[0].addr = ZD_CR67;
        ioreqs[0].value = chip->ofdm_cal_values[OFDM_36M_INDEX][channel-1];
        ioreqs[1].addr = ZD_CR66;
        ioreqs[1].value = chip->ofdm_cal_values[OFDM_48M_INDEX][channel-1];
        ioreqs[2].addr = ZD_CR65;
        ioreqs[2].value = chip->ofdm_cal_values[OFDM_54M_INDEX][channel-1];

        return zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
}

static int update_channel_integration_and_calibration(struct zd_chip *chip,
                                                      u8 channel)
{
        int r;

        if (!zd_rf_should_update_pwr_int(&chip->rf))
                return 0;

        r = update_pwr_int(chip, channel);
        if (r)
                return r;
        if (zd_chip_is_zd1211b(chip)) {
                static const struct zd_ioreq16 ioreqs[] = {
                        { ZD_CR69, 0x28 },
                        {},
                        { ZD_CR69, 0x2a },
                };

                r = update_ofdm_cal(chip, channel);
                if (r)
                        return r;
                r = update_pwr_cal(chip, channel);
                if (r)
                        return r;
                r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
                if (r)
                        return r;
        }

        return 0;
}

/* The CCK baseband gain can be optionally patched by the EEPROM */
static int patch_cck_gain(struct zd_chip *chip)
{
        int r;
        u32 value;

        if (!chip->patch_cck_gain || !zd_rf_should_patch_cck_gain(&chip->rf))
                return 0;

        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        r = zd_ioread32_locked(chip, &value, E2P_PHY_REG);
        if (r)
                return r;
        dev_dbg_f(zd_chip_dev(chip), "patching value %x\n", value & 0xff);
        return zd_iowrite16_locked(chip, value & 0xff, ZD_CR47);
}

int zd_chip_set_channel(struct zd_chip *chip, u8 channel)
{
        int r, t;

        mutex_lock(&chip->mutex);
        r = zd_chip_lock_phy_regs(chip);
        if (r)
                goto out;
        r = zd_rf_set_channel(&chip->rf, channel);
        if (r)
                goto unlock;
        r = update_channel_integration_and_calibration(chip, channel);
        if (r)
                goto unlock;
        r = patch_cck_gain(chip);
        if (r)
                goto unlock;
        r = patch_6m_band_edge(chip, channel);
        if (r)
                goto unlock;
        r = zd_iowrite32_locked(chip, 0, CR_CONFIG_PHILIPS);
unlock:
        t = zd_chip_unlock_phy_regs(chip);
        if (t && !r)
                r = t;
out:
        mutex_unlock(&chip->mutex);
        return r;
}

u8 zd_chip_get_channel(struct zd_chip *chip)
{
        u8 channel;

        mutex_lock(&chip->mutex);
        channel = chip->rf.channel;
        mutex_unlock(&chip->mutex);
        return channel;
}

int zd_chip_control_leds(struct zd_chip *chip, enum led_status status)
{
        const zd_addr_t a[] = {
                fw_reg_addr(chip, FW_REG_LED_LINK_STATUS),
                CR_LED,
        };

        int r;
        u16 v[ARRAY_SIZE(a)];
        struct zd_ioreq16 ioreqs[ARRAY_SIZE(a)] = {
                [0] = { fw_reg_addr(chip, FW_REG_LED_LINK_STATUS) },
                [1] = { CR_LED },
        };
        u16 other_led;

        mutex_lock(&chip->mutex);
        r = zd_ioread16v_locked(chip, v, (const zd_addr_t *)a, ARRAY_SIZE(a));
        if (r)
                goto out;

        other_led = chip->link_led == LED1 ? LED2 : LED1;

        switch (status) {
        case ZD_LED_OFF:
                ioreqs[0].value = FW_LINK_OFF;
                ioreqs[1].value = v[1] & ~(LED1|LED2);
                break;
        case ZD_LED_SCANNING:
                ioreqs[0].value = FW_LINK_OFF;
                ioreqs[1].value = v[1] & ~other_led;
                if (get_seconds() % 3 == 0) {
                        ioreqs[1].value &= ~chip->link_led;
                } else {
                        ioreqs[1].value |= chip->link_led;
                }
                break;
        case ZD_LED_ASSOCIATED:
                ioreqs[0].value = FW_LINK_TX;
                ioreqs[1].value = v[1] & ~other_led;
                ioreqs[1].value |= chip->link_led;
                break;
        default:
                r = -EINVAL;
                goto out;
        }

        if (v[0] != ioreqs[0].value || v[1] != ioreqs[1].value) {
                r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
                if (r)
                        goto out;
        }
        r = 0;
out:
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_chip_set_basic_rates(struct zd_chip *chip, u16 cr_rates)
{
        int r;

        if (cr_rates & ~(CR_RATES_80211B|CR_RATES_80211G))
                return -EINVAL;

        mutex_lock(&chip->mutex);
        r = zd_iowrite32_locked(chip, cr_rates, CR_BASIC_RATE_TBL);
        mutex_unlock(&chip->mutex);
        return r;
}

static inline u8 zd_rate_from_ofdm_plcp_header(const void *rx_frame)
{
        return ZD_OFDM | zd_ofdm_plcp_header_rate(rx_frame);
}

/**
 * zd_rx_rate - report zd-rate
 * @rx_frame - received frame
 * @rx_status - rx_status as given by the device
 *
 * This function converts the rate as encoded in the received packet to the
 * zd-rate, we are using on other places in the driver.
 */
u8 zd_rx_rate(const void *rx_frame, const struct rx_status *status)
{
        u8 zd_rate;
        if (status->frame_status & ZD_RX_OFDM) {
                zd_rate = zd_rate_from_ofdm_plcp_header(rx_frame);
        } else {
                switch (zd_cck_plcp_header_signal(rx_frame)) {
                case ZD_CCK_PLCP_SIGNAL_1M:
                        zd_rate = ZD_CCK_RATE_1M;
                        break;
                case ZD_CCK_PLCP_SIGNAL_2M:
                        zd_rate = ZD_CCK_RATE_2M;
                        break;
                case ZD_CCK_PLCP_SIGNAL_5M5:
                        zd_rate = ZD_CCK_RATE_5_5M;
                        break;
                case ZD_CCK_PLCP_SIGNAL_11M:
                        zd_rate = ZD_CCK_RATE_11M;
                        break;
                default:
                        zd_rate = 0;
                }
        }

        return zd_rate;
}

int zd_chip_switch_radio_on(struct zd_chip *chip)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_switch_radio_on(&chip->rf);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_chip_switch_radio_off(struct zd_chip *chip)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_switch_radio_off(&chip->rf);
        mutex_unlock(&chip->mutex);
        return r;
}

int zd_chip_enable_int(struct zd_chip *chip)
{
        int r;

        mutex_lock(&chip->mutex);
        r = zd_usb_enable_int(&chip->usb);
        mutex_unlock(&chip->mutex);
        return r;
}

void zd_chip_disable_int(struct zd_chip *chip)
{
        mutex_lock(&chip->mutex);
        zd_usb_disable_int(&chip->usb);
        mutex_unlock(&chip->mutex);

        /* cancel pending interrupt work */
        cancel_work_sync(&zd_chip_to_mac(chip)->process_intr);
}

int zd_chip_enable_rxtx(struct zd_chip *chip)
{
        int r;

        mutex_lock(&chip->mutex);
        zd_usb_enable_tx(&chip->usb);
        r = zd_usb_enable_rx(&chip->usb);
        zd_tx_watchdog_enable(&chip->usb);
        mutex_unlock(&chip->mutex);
        return r;
}

void zd_chip_disable_rxtx(struct zd_chip *chip)
{
        mutex_lock(&chip->mutex);
        zd_tx_watchdog_disable(&chip->usb);
        zd_usb_disable_rx(&chip->usb);
        zd_usb_disable_tx(&chip->usb);
        mutex_unlock(&chip->mutex);
}

int zd_rfwritev_locked(struct zd_chip *chip,
                       const u32* values, unsigned int count, u8 bits)
{
        int r;
        unsigned int i;

        for (i = 0; i < count; i++) {
                r = zd_rfwrite_locked(chip, values[i], bits);
                if (r)
                        return r;
        }

        return 0;
}

/*
 * We can optionally program the RF directly through CR regs, if supported by
 * the hardware. This is much faster than the older method.
 */
int zd_rfwrite_cr_locked(struct zd_chip *chip, u32 value)
{
        const struct zd_ioreq16 ioreqs[] = {
                { ZD_CR244, (value >> 16) & 0xff },
                { ZD_CR243, (value >>  8) & 0xff },
                { ZD_CR242,  value        & 0xff },
        };
        ZD_ASSERT(mutex_is_locked(&chip->mutex));
        return zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
}

int zd_rfwritev_cr_locked(struct zd_chip *chip,
                          const u32 *values, unsigned int count)
{
        int r;
        unsigned int i;

        for (i = 0; i < count; i++) {
                r = zd_rfwrite_cr_locked(chip, values[i]);
                if (r)
                        return r;
        }

        return 0;
}

int zd_chip_set_multicast_hash(struct zd_chip *chip,
                               struct zd_mc_hash *hash)
{
        const struct zd_ioreq32 ioreqs[] = {
                { CR_GROUP_HASH_P1, hash->low },
                { CR_GROUP_HASH_P2, hash->high },
        };

        return zd_iowrite32a(chip, ioreqs, ARRAY_SIZE(ioreqs));
}

u64 zd_chip_get_tsf(struct zd_chip *chip)
{
        int r;
        static const zd_addr_t aw_pt_bi_addr[] =
                { CR_TSF_LOW_PART, CR_TSF_HIGH_PART };
        u32 values[2];
        u64 tsf;

        mutex_lock(&chip->mutex);
        r = zd_ioread32v_locked(chip, values, (const zd_addr_t *)aw_pt_bi_addr,
                                ARRAY_SIZE(aw_pt_bi_addr));
        mutex_unlock(&chip->mutex);
        if (r)
                return 0;

        tsf = values[1];
        tsf = (tsf << 32) | values[0];

        return tsf;
}