Add HostAP wireless driver.

Includes minor cleanups from Adrian Bunk <bunk@stusta.de>.

1 files changed, 766 insertions, 0 deletions

diff --git a/drivers/net/wireless/hostap/hostap_download.c b/drivers/net/wireless/hostap/hostap_download.c
new file mode 100644
index 000000000000..ab26b52b3e76
--- /dev/null
+++ b/drivers/net/wireless/hostap/hostap_download.c
@@ -0,0 +1,766 @@
+static int prism2_enable_aux_port(struct net_device *dev, int enable)
+{
+        u16 val, reg;
+        int i, tries;
+        unsigned long flags;
+        struct hostap_interface *iface;
+        local_info_t *local;
+
+        iface = netdev_priv(dev);
+        local = iface->local;
+
+        if (local->no_pri) {
+                if (enable) {
+                        PDEBUG(DEBUG_EXTRA2, "%s: no PRI f/w - assuming Aux "
+                               "port is already enabled\n", dev->name);
+                }
+                return 0;
+        }
+
+        spin_lock_irqsave(&local->cmdlock, flags);
+
+        /* wait until busy bit is clear */
+        tries = HFA384X_CMD_BUSY_TIMEOUT;
+        while (HFA384X_INW(HFA384X_CMD_OFF) & HFA384X_CMD_BUSY && tries > 0) {
+                tries--;
+                udelay(1);
+        }
+        if (tries == 0) {
+                reg = HFA384X_INW(HFA384X_CMD_OFF);
+                spin_unlock_irqrestore(&local->cmdlock, flags);
+                printk("%s: prism2_enable_aux_port - timeout - reg=0x%04x\n",
+                       dev->name, reg);
+                return -ETIMEDOUT;
+        }
+
+        val = HFA384X_INW(HFA384X_CONTROL_OFF);
+
+        if (enable) {
+                HFA384X_OUTW(HFA384X_AUX_MAGIC0, HFA384X_PARAM0_OFF);
+                HFA384X_OUTW(HFA384X_AUX_MAGIC1, HFA384X_PARAM1_OFF);
+                HFA384X_OUTW(HFA384X_AUX_MAGIC2, HFA384X_PARAM2_OFF);
+
+                if ((val & HFA384X_AUX_PORT_MASK) != HFA384X_AUX_PORT_DISABLED)
+                        printk("prism2_enable_aux_port: was not disabled!?\n");
+                val &= ~HFA384X_AUX_PORT_MASK;
+                val |= HFA384X_AUX_PORT_ENABLE;
+        } else {
+                HFA384X_OUTW(0, HFA384X_PARAM0_OFF);
+                HFA384X_OUTW(0, HFA384X_PARAM1_OFF);
+                HFA384X_OUTW(0, HFA384X_PARAM2_OFF);
+
+                if ((val & HFA384X_AUX_PORT_MASK) != HFA384X_AUX_PORT_ENABLED)
+                        printk("prism2_enable_aux_port: was not enabled!?\n");
+                val &= ~HFA384X_AUX_PORT_MASK;
+                val |= HFA384X_AUX_PORT_DISABLE;
+        }
+        HFA384X_OUTW(val, HFA384X_CONTROL_OFF);
+
+        udelay(5);
+
+        i = 10000;
+        while (i > 0) {
+                val = HFA384X_INW(HFA384X_CONTROL_OFF);
+                val &= HFA384X_AUX_PORT_MASK;
+
+                if ((enable && val == HFA384X_AUX_PORT_ENABLED) ||
+                    (!enable && val == HFA384X_AUX_PORT_DISABLED))
+                        break;
+
+                udelay(10);
+                i--;
+        }
+
+        spin_unlock_irqrestore(&local->cmdlock, flags);
+
+        if (i == 0) {
+                printk("prism2_enable_aux_port(%d) timed out\n",
+                       enable);
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+}
+
+
+static int hfa384x_from_aux(struct net_device *dev, unsigned int addr, int len,
+                            void *buf)
+{
+        u16 page, offset;
+        if (addr & 1 || len & 1)
+                return -1;
+
+        page = addr >> 7;
+        offset = addr & 0x7f;
+
+        HFA384X_OUTW(page, HFA384X_AUXPAGE_OFF);
+        HFA384X_OUTW(offset, HFA384X_AUXOFFSET_OFF);
+
+        udelay(5);
+
+#ifdef PRISM2_PCI
+        {
+                u16 *pos = (u16 *) buf;
+                while (len > 0) {
+                        *pos++ = HFA384X_INW_DATA(HFA384X_AUXDATA_OFF);
+                        len -= 2;
+                }
+        }
+#else /* PRISM2_PCI */
+        HFA384X_INSW(HFA384X_AUXDATA_OFF, buf, len / 2);
+#endif /* PRISM2_PCI */
+
+        return 0;
+}
+
+
+static int hfa384x_to_aux(struct net_device *dev, unsigned int addr, int len,
+                          void *buf)
+{
+        u16 page, offset;
+        if (addr & 1 || len & 1)
+                return -1;
+
+        page = addr >> 7;
+        offset = addr & 0x7f;
+
+        HFA384X_OUTW(page, HFA384X_AUXPAGE_OFF);
+        HFA384X_OUTW(offset, HFA384X_AUXOFFSET_OFF);
+
+        udelay(5);
+
+#ifdef PRISM2_PCI
+        {
+                u16 *pos = (u16 *) buf;
+                while (len > 0) {
+                        HFA384X_OUTW_DATA(*pos++, HFA384X_AUXDATA_OFF);
+                        len -= 2;
+                }
+        }
+#else /* PRISM2_PCI */
+        HFA384X_OUTSW(HFA384X_AUXDATA_OFF, buf, len / 2);
+#endif /* PRISM2_PCI */
+
+        return 0;
+}
+
+
+static int prism2_pda_ok(u8 *buf)
+{
+        u16 *pda = (u16 *) buf;
+        int pos;
+        u16 len, pdr;
+
+        if (buf[0] == 0xff && buf[1] == 0x00 && buf[2] == 0xff &&
+            buf[3] == 0x00)
+                return 0;
+
+        pos = 0;
+        while (pos + 1 < PRISM2_PDA_SIZE / 2) {
+                len = le16_to_cpu(pda[pos]);
+                pdr = le16_to_cpu(pda[pos + 1]);
+                if (len == 0 || pos + len > PRISM2_PDA_SIZE / 2)
+                        return 0;
+
+                if (pdr == 0x0000 && len == 2) {
+                        /* PDA end found */
+                        return 1;
+                }
+
+                pos += len + 1;
+        }
+
+        return 0;
+}
+
+
+static int prism2_download_aux_dump(struct net_device *dev,
+                                     unsigned int addr, int len, u8 *buf)
+{
+        int res;
+
+        prism2_enable_aux_port(dev, 1);
+        res = hfa384x_from_aux(dev, addr, len, buf);
+        prism2_enable_aux_port(dev, 0);
+        if (res)
+                return -1;
+
+        return 0;
+}
+
+
+static u8 * prism2_read_pda(struct net_device *dev)
+{
+        u8 *buf;
+        int res, i, found = 0;
+#define NUM_PDA_ADDRS 4
+        unsigned int pda_addr[NUM_PDA_ADDRS] = {
+                0x7f0000 /* others than HFA3841 */,
+                0x3f0000 /* HFA3841 */,
+                0x390000 /* apparently used in older cards */,
+                0x7f0002 /* Intel PRO/Wireless 2011B (PCI) */,
+        };
+
+        buf = (u8 *) kmalloc(PRISM2_PDA_SIZE, GFP_KERNEL);
+        if (buf == NULL)
+                return NULL;
+
+        /* Note: wlan card should be in initial state (just after init cmd)
+         * and no other operations should be performed concurrently. */
+
+        prism2_enable_aux_port(dev, 1);
+
+        for (i = 0; i < NUM_PDA_ADDRS; i++) {
+                PDEBUG(DEBUG_EXTRA2, "%s: trying to read PDA from 0x%08x",
+                       dev->name, pda_addr[i]);
+                res = hfa384x_from_aux(dev, pda_addr[i], PRISM2_PDA_SIZE, buf);
+                if (res)
+                        continue;
+                if (res == 0 && prism2_pda_ok(buf)) {
+                        PDEBUG2(DEBUG_EXTRA2, ": OK\n");
+                        found = 1;
+                        break;
+                } else {
+                        PDEBUG2(DEBUG_EXTRA2, ": failed\n");
+                }
+        }
+
+        prism2_enable_aux_port(dev, 0);
+
+        if (!found) {
+                printk(KERN_DEBUG "%s: valid PDA not found\n", dev->name);
+                kfree(buf);
+                buf = NULL;
+        }
+
+        return buf;
+}
+
+
+static int prism2_download_volatile(local_info_t *local,
+                                    struct prism2_download_data *param)
+{
+        struct net_device *dev = local->dev;
+        int ret = 0, i;
+        u16 param0, param1;
+
+        if (local->hw_downloading) {
+                printk(KERN_WARNING "%s: Already downloading - aborting new "
+                       "request\n", dev->name);
+                return -1;
+        }
+
+        local->hw_downloading = 1;
+        if (local->pri_only) {
+                hfa384x_disable_interrupts(dev);
+        } else {
+                prism2_hw_shutdown(dev, 0);
+
+                if (prism2_hw_init(dev, 0)) {
+                        printk(KERN_WARNING "%s: Could not initialize card for"
+                               " download\n", dev->name);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        if (prism2_enable_aux_port(dev, 1)) {
+                printk(KERN_WARNING "%s: Could not enable AUX port\n",
+                       dev->name);
+                ret = -1;
+                goto out;
+        }
+
+        param0 = param->start_addr & 0xffff;
+        param1 = param->start_addr >> 16;
+
+        HFA384X_OUTW(0, HFA384X_PARAM2_OFF);
+        HFA384X_OUTW(param1, HFA384X_PARAM1_OFF);
+        if (hfa384x_cmd_wait(dev, HFA384X_CMDCODE_DOWNLOAD |
+                             (HFA384X_PROGMODE_ENABLE_VOLATILE << 8),
+                             param0)) {
+                printk(KERN_WARNING "%s: Download command execution failed\n",
+                       dev->name);
+                ret = -1;
+                goto out;
+        }
+
+        for (i = 0; i < param->num_areas; i++) {
+                PDEBUG(DEBUG_EXTRA2, "%s: Writing %d bytes at 0x%08x\n",
+                       dev->name, param->data[i].len, param->data[i].addr);
+                if (hfa384x_to_aux(dev, param->data[i].addr,
+                                   param->data[i].len, param->data[i].data)) {
+                        printk(KERN_WARNING "%s: RAM download at 0x%08x "
+                               "(len=%d) failed\n", dev->name,
+                               param->data[i].addr, param->data[i].len);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        HFA384X_OUTW(param1, HFA384X_PARAM1_OFF);
+        HFA384X_OUTW(0, HFA384X_PARAM2_OFF);
+        if (hfa384x_cmd_no_wait(dev, HFA384X_CMDCODE_DOWNLOAD |
+                                (HFA384X_PROGMODE_DISABLE << 8), param0)) {
+                printk(KERN_WARNING "%s: Download command execution failed\n",
+                       dev->name);
+                ret = -1;
+                goto out;
+        }
+        /* ProgMode disable causes the hardware to restart itself from the
+         * given starting address. Give hw some time and ACK command just in
+         * case restart did not happen. */
+        mdelay(5);
+        HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_EVACK_OFF);
+
+        if (prism2_enable_aux_port(dev, 0)) {
+                printk(KERN_DEBUG "%s: Disabling AUX port failed\n",
+                       dev->name);
+                /* continue anyway.. restart should have taken care of this */
+        }
+
+        mdelay(5);
+        local->hw_downloading = 0;
+        if (prism2_hw_config(dev, 2)) {
+                printk(KERN_WARNING "%s: Card configuration after RAM "
+                       "download failed\n", dev->name);
+                ret = -1;
+                goto out;
+        }
+
+ out:
+        local->hw_downloading = 0;
+        return ret;
+}
+
+
+static int prism2_enable_genesis(local_info_t *local, int hcr)
+{
+        struct net_device *dev = local->dev;
+        u8 initseq[4] = { 0x00, 0xe1, 0xa1, 0xff };
+        u8 readbuf[4];
+
+        printk(KERN_DEBUG "%s: test Genesis mode with HCR 0x%02x\n",
+               dev->name, hcr);
+        local->func->cor_sreset(local);
+        hfa384x_to_aux(dev, 0x7e0038, sizeof(initseq), initseq);
+        local->func->genesis_reset(local, hcr);
+
+        /* Readback test */
+        hfa384x_from_aux(dev, 0x7e0038, sizeof(readbuf), readbuf);
+        hfa384x_to_aux(dev, 0x7e0038, sizeof(initseq), initseq);
+        hfa384x_from_aux(dev, 0x7e0038, sizeof(readbuf), readbuf);
+
+        if (memcmp(initseq, readbuf, sizeof(initseq)) == 0) {
+                printk(KERN_DEBUG "Readback test succeeded, HCR 0x%02x\n",
+                       hcr);
+                return 0;
+        } else {
+                printk(KERN_DEBUG "Readback test failed, HCR 0x%02x "
+                       "write %02x %02x %02x %02x read %02x %02x %02x %02x\n",
+                       hcr, initseq[0], initseq[1], initseq[2], initseq[3],
+                       readbuf[0], readbuf[1], readbuf[2], readbuf[3]);
+                return 1;
+        }
+}
+
+
+static int prism2_get_ram_size(local_info_t *local)
+{
+        int ret;
+
+        /* Try to enable genesis mode; 0x1F for x8 SRAM or 0x0F for x16 SRAM */
+        if (prism2_enable_genesis(local, 0x1f) == 0)
+                ret = 8;
+        else if (prism2_enable_genesis(local, 0x0f) == 0)
+                ret = 16;
+        else
+                ret = -1;
+
+        /* Disable genesis mode */
+        local->func->genesis_reset(local, ret == 16 ? 0x07 : 0x17);
+
+        return ret;
+}
+
+
+static int prism2_download_genesis(local_info_t *local,
+                                   struct prism2_download_data *param)
+{
+        struct net_device *dev = local->dev;
+        int ram16 = 0, i;
+        int ret = 0;
+
+        if (local->hw_downloading) {
+                printk(KERN_WARNING "%s: Already downloading - aborting new "
+                       "request\n", dev->name);
+                return -EBUSY;
+        }
+
+        if (!local->func->genesis_reset || !local->func->cor_sreset) {
+                printk(KERN_INFO "%s: Genesis mode downloading not supported "
+                       "with this hwmodel\n", dev->name);
+                return -EOPNOTSUPP;
+        }
+
+        local->hw_downloading = 1;
+
+        if (prism2_enable_aux_port(dev, 1)) {
+                printk(KERN_DEBUG "%s: failed to enable AUX port\n",
+                       dev->name);
+                ret = -EIO;
+                goto out;
+        }
+
+        if (local->sram_type == -1) {
+                /* 0x1F for x8 SRAM or 0x0F for x16 SRAM */
+                if (prism2_enable_genesis(local, 0x1f) == 0) {
+                        ram16 = 0;
+                        PDEBUG(DEBUG_EXTRA2, "%s: Genesis mode OK using x8 "
+                               "SRAM\n", dev->name);
+                } else if (prism2_enable_genesis(local, 0x0f) == 0) {
+                        ram16 = 1;
+                        PDEBUG(DEBUG_EXTRA2, "%s: Genesis mode OK using x16 "
+                               "SRAM\n", dev->name);
+                } else {
+                        printk(KERN_DEBUG "%s: Could not initiate genesis "
+                               "mode\n", dev->name);
+                        ret = -EIO;
+                        goto out;
+                }
+        } else {
+                if (prism2_enable_genesis(local, local->sram_type == 8 ?
+                                          0x1f : 0x0f)) {
+                        printk(KERN_DEBUG "%s: Failed to set Genesis "
+                               "mode (sram_type=%d)\n", dev->name,
+                               local->sram_type);
+                        ret = -EIO;
+                        goto out;
+                }
+                ram16 = local->sram_type != 8;
+        }
+
+        for (i = 0; i < param->num_areas; i++) {
+                PDEBUG(DEBUG_EXTRA2, "%s: Writing %d bytes at 0x%08x\n",
+                       dev->name, param->data[i].len, param->data[i].addr);
+                if (hfa384x_to_aux(dev, param->data[i].addr,
+                                   param->data[i].len, param->data[i].data)) {
+                        printk(KERN_WARNING "%s: RAM download at 0x%08x "
+                               "(len=%d) failed\n", dev->name,
+                               param->data[i].addr, param->data[i].len);
+                        ret = -EIO;
+                        goto out;
+                }
+        }
+
+        PDEBUG(DEBUG_EXTRA2, "Disable genesis mode\n");
+        local->func->genesis_reset(local, ram16 ? 0x07 : 0x17);
+        if (prism2_enable_aux_port(dev, 0)) {
+                printk(KERN_DEBUG "%s: Failed to disable AUX port\n",
+                       dev->name);
+        }
+
+        mdelay(5);
+        local->hw_downloading = 0;
+
+        PDEBUG(DEBUG_EXTRA2, "Trying to initialize card\n");
+        /*
+         * Make sure the INIT command does not generate a command completion
+         * event by disabling interrupts.
+         */
+        hfa384x_disable_interrupts(dev);
+        if (prism2_hw_init(dev, 1)) {
+                printk(KERN_DEBUG "%s: Initialization after genesis mode "
+                       "download failed\n", dev->name);
+                ret = -EIO;
+                goto out;
+        }
+
+        PDEBUG(DEBUG_EXTRA2, "Card initialized - running PRI only\n");
+        if (prism2_hw_init2(dev, 1)) {
+                printk(KERN_DEBUG "%s: Initialization(2) after genesis mode "
+                       "download failed\n", dev->name);
+                ret = -EIO;
+                goto out;
+        }
+
+ out:
+        local->hw_downloading = 0;
+        return ret;
+}
+
+
+#ifdef PRISM2_NON_VOLATILE_DOWNLOAD
+/* Note! Non-volatile downloading functionality has not yet been tested
+ * thoroughly and it may corrupt flash image and effectively kill the card that
+ * is being updated. You have been warned. */
+
+static inline int prism2_download_block(struct net_device *dev,
+                                        u32 addr, u8 *data,
+                                        u32 bufaddr, int rest_len)
+{
+        u16 param0, param1;
+        int block_len;
+
+        block_len = rest_len < 4096 ? rest_len : 4096;
+
+        param0 = addr & 0xffff;
+        param1 = addr >> 16;
+
+        HFA384X_OUTW(block_len, HFA384X_PARAM2_OFF);
+        HFA384X_OUTW(param1, HFA384X_PARAM1_OFF);
+
+        if (hfa384x_cmd_wait(dev, HFA384X_CMDCODE_DOWNLOAD |
+                             (HFA384X_PROGMODE_ENABLE_NON_VOLATILE << 8),
+                             param0)) {
+                printk(KERN_WARNING "%s: Flash download command execution "
+                       "failed\n", dev->name);
+                return -1;
+        }
+
+        if (hfa384x_to_aux(dev, bufaddr, block_len, data)) {
+                printk(KERN_WARNING "%s: flash download at 0x%08x "
+                       "(len=%d) failed\n", dev->name, addr, block_len);
+                return -1;
+        }
+
+        HFA384X_OUTW(0, HFA384X_PARAM2_OFF);
+        HFA384X_OUTW(0, HFA384X_PARAM1_OFF);
+        if (hfa384x_cmd_wait(dev, HFA384X_CMDCODE_DOWNLOAD |
+                             (HFA384X_PROGMODE_PROGRAM_NON_VOLATILE << 8),
+                             0)) {
+                printk(KERN_WARNING "%s: Flash write command execution "
+                       "failed\n", dev->name);
+                return -1;
+        }
+
+        return block_len;
+}
+
+
+static int prism2_download_nonvolatile(local_info_t *local,
+                                       struct prism2_download_data *dl)
+{
+        struct net_device *dev = local->dev;
+        int ret = 0, i;
+        struct {
+                u16 page;
+                u16 offset;
+                u16 len;
+        } dlbuffer;
+        u32 bufaddr;
+
+        if (local->hw_downloading) {
+                printk(KERN_WARNING "%s: Already downloading - aborting new "
+                       "request\n", dev->name);
+                return -1;
+        }
+
+        ret = local->func->get_rid(dev, HFA384X_RID_DOWNLOADBUFFER,
+                                   &dlbuffer, 6, 0);
+
+        if (ret < 0) {
+                printk(KERN_WARNING "%s: Could not read download buffer "
+                       "parameters\n", dev->name);
+                goto out;
+        }
+
+        dlbuffer.page = le16_to_cpu(dlbuffer.page);
+        dlbuffer.offset = le16_to_cpu(dlbuffer.offset);
+        dlbuffer.len = le16_to_cpu(dlbuffer.len);
+
+        printk(KERN_DEBUG "Download buffer: %d bytes at 0x%04x:0x%04x\n",
+               dlbuffer.len, dlbuffer.page, dlbuffer.offset);
+
+        bufaddr = (dlbuffer.page << 7) + dlbuffer.offset;
+
+        local->hw_downloading = 1;
+
+        if (!local->pri_only) {
+                prism2_hw_shutdown(dev, 0);
+
+                if (prism2_hw_init(dev, 0)) {
+                        printk(KERN_WARNING "%s: Could not initialize card for"
+                               " download\n", dev->name);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        hfa384x_disable_interrupts(dev);
+
+        if (prism2_enable_aux_port(dev, 1)) {
+                printk(KERN_WARNING "%s: Could not enable AUX port\n",
+                       dev->name);
+                ret = -1;
+                goto out;
+        }
+
+        printk(KERN_DEBUG "%s: starting flash download\n", dev->name);
+        for (i = 0; i < dl->num_areas; i++) {
+                int rest_len = dl->data[i].len;
+                int data_off = 0;
+
+                while (rest_len > 0) {
+                        int block_len;
+
+                        block_len = prism2_download_block(
+                                dev, dl->data[i].addr + data_off,
+                                dl->data[i].data + data_off, bufaddr,
+                                rest_len);
+
+                        if (block_len < 0) {
+                                ret = -1;
+                                goto out;
+                        }
+
+                        rest_len -= block_len;
+                        data_off += block_len;
+                }
+        }
+
+        HFA384X_OUTW(0, HFA384X_PARAM1_OFF);
+        HFA384X_OUTW(0, HFA384X_PARAM2_OFF);
+        if (hfa384x_cmd_wait(dev, HFA384X_CMDCODE_DOWNLOAD |
+                                (HFA384X_PROGMODE_DISABLE << 8), 0)) {
+                printk(KERN_WARNING "%s: Download command execution failed\n",
+                       dev->name);
+                ret = -1;
+                goto out;
+        }
+
+        if (prism2_enable_aux_port(dev, 0)) {
+                printk(KERN_DEBUG "%s: Disabling AUX port failed\n",
+                       dev->name);
+                /* continue anyway.. restart should have taken care of this */
+        }
+
+        mdelay(5);
+
+        local->func->hw_reset(dev);
+        local->hw_downloading = 0;
+        if (prism2_hw_config(dev, 2)) {
+                printk(KERN_WARNING "%s: Card configuration after flash "
+                       "download failed\n", dev->name);
+                ret = -1;
+        } else {
+                printk(KERN_INFO "%s: Card initialized successfully after "
+                       "flash download\n", dev->name);
+        }
+
+ out:
+        local->hw_downloading = 0;
+        return ret;
+}
+#endif /* PRISM2_NON_VOLATILE_DOWNLOAD */
+
+
+static void prism2_download_free_data(struct prism2_download_data *dl)
+{
+        int i;
+
+        if (dl == NULL)
+                return;
+
+        for (i = 0; i < dl->num_areas; i++)
+                kfree(dl->data[i].data);
+        kfree(dl);
+}
+
+
+static int prism2_download(local_info_t *local,
+                           struct prism2_download_param *param)
+{
+        int ret = 0;
+        int i;
+        u32 total_len = 0;
+        struct prism2_download_data *dl = NULL;
+
+        printk(KERN_DEBUG "prism2_download: dl_cmd=%d start_addr=0x%08x "
+               "num_areas=%d\n",
+               param->dl_cmd, param->start_addr, param->num_areas);
+
+        if (param->num_areas > 100) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        dl = kmalloc(sizeof(*dl) + param->num_areas *
+                     sizeof(struct prism2_download_data_area), GFP_KERNEL);
+        if (dl == NULL) {
+                ret = -ENOMEM;
+                goto out;
+        }
+        memset(dl, 0, sizeof(*dl) + param->num_areas *
+               sizeof(struct prism2_download_data_area));
+        dl->dl_cmd = param->dl_cmd;
+        dl->start_addr = param->start_addr;
+        dl->num_areas = param->num_areas;
+        for (i = 0; i < param->num_areas; i++) {
+                PDEBUG(DEBUG_EXTRA2,
+                       "  area %d: addr=0x%08x len=%d ptr=0x%p\n",
+                       i, param->data[i].addr, param->data[i].len,
+                       param->data[i].ptr);
+
+                dl->data[i].addr = param->data[i].addr;
+                dl->data[i].len = param->data[i].len;
+
+                total_len += param->data[i].len;
+                if (param->data[i].len > PRISM2_MAX_DOWNLOAD_AREA_LEN ||
+                    total_len > PRISM2_MAX_DOWNLOAD_LEN) {
+                        ret = -E2BIG;
+                        goto out;
+                }
+
+                dl->data[i].data = kmalloc(dl->data[i].len, GFP_KERNEL);
+                if (dl->data[i].data == NULL) {
+                        ret = -ENOMEM;
+                        goto out;
+                }
+
+                if (copy_from_user(dl->data[i].data, param->data[i].ptr,
+                                   param->data[i].len)) {
+                        ret = -EFAULT;
+                        goto out;
+                }
+        }
+
+        switch (param->dl_cmd) {
+        case PRISM2_DOWNLOAD_VOLATILE:
+        case PRISM2_DOWNLOAD_VOLATILE_PERSISTENT:
+                ret = prism2_download_volatile(local, dl);
+                break;
+        case PRISM2_DOWNLOAD_VOLATILE_GENESIS:
+        case PRISM2_DOWNLOAD_VOLATILE_GENESIS_PERSISTENT:
+                ret = prism2_download_genesis(local, dl);
+                break;
+        case PRISM2_DOWNLOAD_NON_VOLATILE:
+#ifdef PRISM2_NON_VOLATILE_DOWNLOAD
+                ret = prism2_download_nonvolatile(local, dl);
+#else /* PRISM2_NON_VOLATILE_DOWNLOAD */
+                printk(KERN_INFO "%s: non-volatile downloading not enabled\n",
+                       local->dev->name);
+                ret = -EOPNOTSUPP;
+#endif /* PRISM2_NON_VOLATILE_DOWNLOAD */
+                break;
+        default:
+                printk(KERN_DEBUG "%s: unsupported download command %d\n",
+                       local->dev->name, param->dl_cmd);
+                ret = -EINVAL;
+                break;
+        };
+
+ out:
+        if (ret == 0 && dl &&
+            param->dl_cmd == PRISM2_DOWNLOAD_VOLATILE_GENESIS_PERSISTENT) {
+                prism2_download_free_data(local->dl_pri);
+                local->dl_pri = dl;
+        } else if (ret == 0 && dl &&
+                   param->dl_cmd == PRISM2_DOWNLOAD_VOLATILE_PERSISTENT) {
+                prism2_download_free_data(local->dl_sec);
+                local->dl_sec = dl;
+        } else
+                prism2_download_free_data(dl);
+
+        return ret;
+}