1 files changed, 395 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/carl9170/fw.c b/drivers/net/wireless/ath/carl9170/fw.c
new file mode 100644
index 000000000000..36615462b87a
--- /dev/null
+++ b/drivers/net/wireless/ath/carl9170/fw.c
@@ -0,0 +1,395 @@
+/*
+ * Atheros CARL9170 driver
+ *
+ * firmware parser
+ *
+ * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
+ *
+ * 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; see the file COPYING.  If not, see
+ * http://www.gnu.org/licenses/.
+ */
+
+#include <linux/kernel.h>
+#include <linux/firmware.h>
+#include <linux/crc32.h>
+#include "carl9170.h"
+#include "fwcmd.h"
+#include "version.h"
+
+#define MAKE_STR(symbol) #symbol
+#define TO_STR(symbol) MAKE_STR(symbol)
+#define CARL9170FW_API_VER_STR TO_STR(CARL9170FW_API_MAX_VER)
+MODULE_VERSION(CARL9170FW_API_VER_STR ":" CARL9170FW_VERSION_GIT);
+
+static const u8 otus_magic[4] = { OTUS_MAGIC };
+
+static const void *carl9170_fw_find_desc(struct ar9170 *ar, const u8 descid[4],
+        const unsigned int len, const u8 compatible_revision)
+{
+        const struct carl9170fw_desc_head *iter;
+
+        carl9170fw_for_each_hdr(iter, ar->fw.desc) {
+                if (carl9170fw_desc_cmp(iter, descid, len,
+                                        compatible_revision))
+                        return (void *)iter;
+        }
+
+        /* needed to find the LAST desc */
+        if (carl9170fw_desc_cmp(iter, descid, len,
+                                compatible_revision))
+                return (void *)iter;
+
+        return NULL;
+}
+
+static int carl9170_fw_verify_descs(struct ar9170 *ar,
+        const struct carl9170fw_desc_head *head, unsigned int max_len)
+{
+        const struct carl9170fw_desc_head *pos;
+        unsigned long pos_addr, end_addr;
+        unsigned int pos_length;
+
+        if (max_len < sizeof(*pos))
+                return -ENODATA;
+
+        max_len = min_t(unsigned int, CARL9170FW_DESC_MAX_LENGTH, max_len);
+
+        pos = head;
+        pos_addr = (unsigned long) pos;
+        end_addr = pos_addr + max_len;
+
+        while (pos_addr < end_addr) {
+                if (pos_addr + sizeof(*head) > end_addr)
+                        return -E2BIG;
+
+                pos_length = le16_to_cpu(pos->length);
+
+                if (pos_length < sizeof(*head))
+                        return -EBADMSG;
+
+                if (pos_length > max_len)
+                        return -EOVERFLOW;
+
+                if (pos_addr + pos_length > end_addr)
+                        return -EMSGSIZE;
+
+                if (carl9170fw_desc_cmp(pos, LAST_MAGIC,
+                                        CARL9170FW_LAST_DESC_SIZE,
+                                        CARL9170FW_LAST_DESC_CUR_VER))
+                        return 0;
+
+                pos_addr += pos_length;
+                pos = (void *)pos_addr;
+                max_len -= pos_length;
+        }
+        return -EINVAL;
+}
+
+static void carl9170_fw_info(struct ar9170 *ar)
+{
+        const struct carl9170fw_motd_desc *motd_desc;
+        unsigned int str_ver_len;
+        u32 fw_date;
+
+        dev_info(&ar->udev->dev, "driver   API: %s 2%03d-%02d-%02d [%d-%d]\n",
+                CARL9170FW_VERSION_GIT, CARL9170FW_VERSION_YEAR,
+                CARL9170FW_VERSION_MONTH, CARL9170FW_VERSION_DAY,
+                CARL9170FW_API_MIN_VER, CARL9170FW_API_MAX_VER);
+
+        motd_desc = carl9170_fw_find_desc(ar, MOTD_MAGIC,
+                sizeof(*motd_desc), CARL9170FW_MOTD_DESC_CUR_VER);
+
+        if (motd_desc) {
+                str_ver_len = strnlen(motd_desc->release,
+                        CARL9170FW_MOTD_RELEASE_LEN);
+
+                fw_date = le32_to_cpu(motd_desc->fw_year_month_day);
+
+                dev_info(&ar->udev->dev, "firmware API: %.*s 2%03d-%02d-%02d\n",
+                         str_ver_len, motd_desc->release,
+                         CARL9170FW_GET_YEAR(fw_date),
+                         CARL9170FW_GET_MONTH(fw_date),
+                         CARL9170FW_GET_DAY(fw_date));
+
+                strlcpy(ar->hw->wiphy->fw_version, motd_desc->release,
+                        sizeof(ar->hw->wiphy->fw_version));
+        }
+}
+
+static bool valid_dma_addr(const u32 address)
+{
+        if (address >= AR9170_SRAM_OFFSET &&
+            address < (AR9170_SRAM_OFFSET + AR9170_SRAM_SIZE))
+                return true;
+
+        return false;
+}
+
+static bool valid_cpu_addr(const u32 address)
+{
+        if (valid_dma_addr(address) || (address >= AR9170_PRAM_OFFSET &&
+            address < (AR9170_PRAM_OFFSET + AR9170_PRAM_SIZE)))
+                return true;
+
+        return false;
+}
+
+static int carl9170_fw(struct ar9170 *ar, const __u8 *data, size_t len)
+{
+        const struct carl9170fw_otus_desc *otus_desc;
+        const struct carl9170fw_chk_desc *chk_desc;
+        const struct carl9170fw_last_desc *last_desc;
+
+        last_desc = carl9170_fw_find_desc(ar, LAST_MAGIC,
+                sizeof(*last_desc), CARL9170FW_LAST_DESC_CUR_VER);
+        if (!last_desc)
+                return -EINVAL;
+
+        otus_desc = carl9170_fw_find_desc(ar, OTUS_MAGIC,
+                sizeof(*otus_desc), CARL9170FW_OTUS_DESC_CUR_VER);
+        if (!otus_desc) {
+                dev_err(&ar->udev->dev, "failed to find compatible firmware "
+                        "descriptor.\n");
+                return -ENODATA;
+        }
+
+        chk_desc = carl9170_fw_find_desc(ar, CHK_MAGIC,
+                sizeof(*chk_desc), CARL9170FW_CHK_DESC_CUR_VER);
+
+        if (chk_desc) {
+                unsigned long fin, diff;
+                unsigned int dsc_len;
+                u32 crc32;
+
+                dsc_len = min_t(unsigned int, len,
+                        (unsigned long)chk_desc - (unsigned long)otus_desc);
+
+                fin = (unsigned long) last_desc + sizeof(*last_desc);
+                diff = fin - (unsigned long) otus_desc;
+
+                if (diff < len)
+                        len -= diff;
+
+                if (len < 256)
+                        return -EIO;
+
+                crc32 = crc32_le(~0, data, len);
+                if (cpu_to_le32(crc32) != chk_desc->fw_crc32) {
+                        dev_err(&ar->udev->dev, "fw checksum test failed.\n");
+                        return -ENOEXEC;
+                }
+
+                crc32 = crc32_le(crc32, (void *)otus_desc, dsc_len);
+                if (cpu_to_le32(crc32) != chk_desc->hdr_crc32) {
+                        dev_err(&ar->udev->dev, "descriptor check failed.\n");
+                        return -EINVAL;
+                }
+        } else {
+                dev_warn(&ar->udev->dev, "Unprotected firmware image.\n");
+        }
+
+#define SUPP(feat)                                              \
+        (carl9170fw_supports(otus_desc->feature_set, feat))
+
+        if (!SUPP(CARL9170FW_DUMMY_FEATURE)) {
+                dev_err(&ar->udev->dev, "invalid firmware descriptor "
+                        "format detected.\n");
+                return -EINVAL;
+        }
+
+        ar->fw.api_version = otus_desc->api_ver;
+
+        if (ar->fw.api_version < CARL9170FW_API_MIN_VER ||
+            ar->fw.api_version > CARL9170FW_API_MAX_VER) {
+                dev_err(&ar->udev->dev, "unsupported firmware api version.\n");
+                return -EINVAL;
+        }
+
+        if (!SUPP(CARL9170FW_COMMAND_PHY) || SUPP(CARL9170FW_UNUSABLE) ||
+            !SUPP(CARL9170FW_HANDLE_BACK_REQ)) {
+                dev_err(&ar->udev->dev, "firmware does support "
+                        "mandatory features.\n");
+                return -ECANCELED;
+        }
+
+        if (ilog2(le32_to_cpu(otus_desc->feature_set)) >=
+                __CARL9170FW_FEATURE_NUM) {
+                dev_warn(&ar->udev->dev, "driver does not support all "
+                         "firmware features.\n");
+        }
+
+        if (!SUPP(CARL9170FW_COMMAND_CAM)) {
+                dev_info(&ar->udev->dev, "crypto offloading is disabled "
+                         "by firmware.\n");
+                ar->disable_offload = true;
+        }
+
+        if (SUPP(CARL9170FW_PSM))
+                ar->hw->flags |= IEEE80211_HW_SUPPORTS_PS;
+
+        if (!SUPP(CARL9170FW_USB_INIT_FIRMWARE)) {
+                dev_err(&ar->udev->dev, "firmware does not provide "
+                        "mandatory interfaces.\n");
+                return -EINVAL;
+        }
+
+        if (SUPP(CARL9170FW_MINIBOOT))
+                ar->fw.offset = le16_to_cpu(otus_desc->miniboot_size);
+        else
+                ar->fw.offset = 0;
+
+        if (SUPP(CARL9170FW_USB_DOWN_STREAM)) {
+                ar->hw->extra_tx_headroom += sizeof(struct ar9170_stream);
+                ar->fw.tx_stream = true;
+        }
+
+        if (SUPP(CARL9170FW_USB_UP_STREAM))
+                ar->fw.rx_stream = true;
+
+        ar->fw.vif_num = otus_desc->vif_num;
+        ar->fw.cmd_bufs = otus_desc->cmd_bufs;
+        ar->fw.address = le32_to_cpu(otus_desc->fw_address);
+        ar->fw.rx_size = le16_to_cpu(otus_desc->rx_max_frame_len);
+        ar->fw.mem_blocks = min_t(unsigned int, otus_desc->tx_descs, 0xfe);
+        atomic_set(&ar->mem_free_blocks, ar->fw.mem_blocks);
+        ar->fw.mem_block_size = le16_to_cpu(otus_desc->tx_frag_len);
+
+        if (ar->fw.vif_num >= AR9170_MAX_VIRTUAL_MAC || !ar->fw.vif_num ||
+            ar->fw.mem_blocks < 16 || !ar->fw.cmd_bufs ||
+            ar->fw.mem_block_size < 64 || ar->fw.mem_block_size > 512 ||
+            ar->fw.rx_size > 32768 || ar->fw.rx_size < 4096 ||
+            !valid_cpu_addr(ar->fw.address)) {
+                dev_err(&ar->udev->dev, "firmware shows obvious signs of "
+                        "malicious tampering.\n");
+                return -EINVAL;
+        }
+
+        ar->fw.beacon_addr = le32_to_cpu(otus_desc->bcn_addr);
+        ar->fw.beacon_max_len = le16_to_cpu(otus_desc->bcn_len);
+
+        if (valid_dma_addr(ar->fw.beacon_addr) && ar->fw.beacon_max_len >=
+            AR9170_MAC_BCN_LENGTH_MAX) {
+                ar->hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_ADHOC);
+
+                if (SUPP(CARL9170FW_WLANTX_CAB)) {
+                        ar->hw->wiphy->interface_modes |=
+                                BIT(NL80211_IFTYPE_AP);
+                }
+        }
+
+#undef SUPPORTED
+        return 0;
+}
+
+static struct carl9170fw_desc_head *
+carl9170_find_fw_desc(struct ar9170 *ar, const __u8 *fw_data, const size_t len)
+
+{
+        int scan = 0, found = 0;
+
+        if (!carl9170fw_size_check(len)) {
+                dev_err(&ar->udev->dev, "firmware size is out of bound.\n");
+                return NULL;
+        }
+
+        while (scan < len - sizeof(struct carl9170fw_desc_head)) {
+                if (fw_data[scan++] == otus_magic[found])
+                        found++;
+                else
+                        found = 0;
+
+                if (scan >= len)
+                        break;
+
+                if (found == sizeof(otus_magic))
+                        break;
+        }
+
+        if (found != sizeof(otus_magic))
+                return NULL;
+
+        return (void *)&fw_data[scan - found];
+}
+
+int carl9170_fw_fix_eeprom(struct ar9170 *ar)
+{
+        const struct carl9170fw_fix_desc *fix_desc = NULL;
+        unsigned int i, n, off;
+        u32 *data = (void *)&ar->eeprom;
+
+        fix_desc = carl9170_fw_find_desc(ar, FIX_MAGIC,
+                sizeof(*fix_desc), CARL9170FW_FIX_DESC_CUR_VER);
+
+        if (!fix_desc)
+                return 0;
+
+        n = (le16_to_cpu(fix_desc->head.length) - sizeof(*fix_desc)) /
+            sizeof(struct carl9170fw_fix_entry);
+
+        for (i = 0; i < n; i++) {
+                off = le32_to_cpu(fix_desc->data[i].address) -
+                      AR9170_EEPROM_START;
+
+                if (off >= sizeof(struct ar9170_eeprom) || (off & 3)) {
+                        dev_err(&ar->udev->dev, "Skip invalid entry %d\n", i);
+                        continue;
+                }
+
+                data[off / sizeof(*data)] &=
+                        le32_to_cpu(fix_desc->data[i].mask);
+                data[off / sizeof(*data)] |=
+                        le32_to_cpu(fix_desc->data[i].value);
+        }
+
+        return 0;
+}
+
+int carl9170_parse_firmware(struct ar9170 *ar)
+{
+        const struct carl9170fw_desc_head *fw_desc = NULL;
+        const struct firmware *fw = ar->fw.fw;
+        unsigned long header_offset = 0;
+        int err;
+
+        if (WARN_ON(!fw))
+                return -EINVAL;
+
+        fw_desc = carl9170_find_fw_desc(ar, fw->data, fw->size);
+
+        if (!fw_desc) {
+                dev_err(&ar->udev->dev, "unsupported firmware.\n");
+                return -ENODATA;
+        }
+
+        header_offset = (unsigned long)fw_desc - (unsigned long)fw->data;
+
+        err = carl9170_fw_verify_descs(ar, fw_desc, fw->size - header_offset);
+        if (err) {
+                dev_err(&ar->udev->dev, "damaged firmware (%d).\n", err);
+                return err;
+        }
+
+        ar->fw.desc = fw_desc;
+
+        carl9170_fw_info(ar);
+
+        err = carl9170_fw(ar, fw->data, fw->size);
+        if (err) {
+                dev_err(&ar->udev->dev, "failed to parse firmware (%d).\n",
+                        err);
+                return err;
+        }
+
+        return 0;
+}