wimax/i2400m: decide properly if using signed vs non-signed firmware loading

The i2400m based devices can boot two main types of firmware images:
signed and non-signed. Signed images have signature data included that
must match that of a certificate stored in the device.

Currently the code is making the decission on what type of firmware
load (signed vs non-signed) is going to be loaded based on a hardcoded
decission in __i2400m_ack_verify(), based on the barker the device
sent upon boot.

This is not flexible enough as future hardware will emit more barkers;
thus the bit has to be set in a place where there is better knowledge
of what is going on. This will be done in follow-up commits -- however
this patch paves the way for it.

So the querying of the mode is packed into i2400m_boot_is_signed();
the main changes are just using i2400m_boot_is_signed() to determine
the method to follow and setting i2400m->sboot in
i2400m_is_boot_barker(). The modifications in i2400m_dnload_init() and
i2400m_dnload_finalize() are just reorganizing the order of the if
blocks and thus look larger than they really are.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

diff --git a/drivers/net/wimax/i2400m/fw.c b/drivers/net/wimax/i2400m/fw.c
index 92d4d60..c962a8d 100644 (file)
--- a/drivers/net/wimax/i2400m/fw.c
+++ b/drivers/net/wimax/i2400m/fw.c
@@ -509,6 +509,17 @@ error_send:
 
 
 /*
+ * Indicate if the device emitted a reboot barker that indicates
+ * "signed boot"
+ */
+static
+unsigned i2400m_boot_is_signed(struct i2400m *i2400m)
+{
+       return likely(i2400m->sboot);
+}
+
+
+/*
  * Do the final steps of uploading firmware
  *
  * Depending on the boot mode (signed vs non-signed), different
@@ -529,7 +540,7 @@ int i2400m_dnload_finalize(struct i2400m *i2400m,
 
        d_fnstart(3, dev, "offset %zu\n", offset);
        cmd = (void *) bcf + offset;
-       if (i2400m->sboot == 0) {
+       if (i2400m_boot_is_signed(i2400m) == 0) {
                struct i2400m_bootrom_header jump_ack;
                d_printf(1, dev, "unsecure boot, jumping to 0x%08x\n",
                        le32_to_cpu(cmd->target_addr));
@@ -846,28 +857,24 @@ int i2400m_dnload_init(struct i2400m *i2400m, const struct i2400m_bcf_hdr *bcf)
 {
        int result;
        struct device *dev = i2400m_dev(i2400m);
-       u32 module_id = le32_to_cpu(bcf->module_id);
 
-       if (i2400m->sboot == 0
-           && (module_id & I2400M_BCF_MOD_ID_POKES) == 0) {
-               /* non-signed boot process without pokes */
-               result = i2400m_dnload_init_nonsigned(i2400m);
+       if (i2400m_boot_is_signed(i2400m)) {
+               d_printf(1, dev, "signed boot\n");
+               result = i2400m_dnload_init_signed(i2400m, bcf);
                if (result == -ERESTARTSYS)
                        return result;
                if (result < 0)
-                       dev_err(dev, "fw %s: non-signed download "
+                       dev_err(dev, "firmware %s: signed boot download "
                                "initialization failed: %d\n",
                                i2400m->fw_name, result);
-       } else if (i2400m->sboot == 0
-                && (module_id & I2400M_BCF_MOD_ID_POKES)) {
-               /* non-signed boot process with pokes, nothing to do */
-               result = 0;
-       } else {                 /* signed boot process */
-               result = i2400m_dnload_init_signed(i2400m, bcf);
+       } else {
+               /* non-signed boot process without pokes */
+               d_printf(1, dev, "non-signed boot\n");
+               result = i2400m_dnload_init_nonsigned(i2400m);
                if (result == -ERESTARTSYS)
                        return result;
                if (result < 0)
-                       dev_err(dev, "fw %s: signed boot download "
+                       dev_err(dev, "firmware %s: non-signed download "
                                "initialization failed: %d\n",
                                i2400m->fw_name, result);
        }

diff --git a/include/linux/wimax/i2400m.h b/include/linux/wimax/i2400m.h
index 433693e..d6e2a35 100644 (file)
--- a/include/linux/wimax/i2400m.h
+++ b/include/linux/wimax/i2400m.h
@@ -168,16 +168,6 @@ enum i2400m_brh {
 };
 
 
-/* Constants for bcf->module_id */
-enum i2400m_bcf_mod_id {
-       /* Firmware file carries its own pokes -- pokes are a set of
-        * magical values that have to be written in certain memory
-        * addresses to get the device up and ready for firmware
-        * download when it is in non-signed boot mode. */
-       I2400M_BCF_MOD_ID_POKES = 0x000000001,
-};
-
-
 /**
  * i2400m_bootrom_header - Header for a boot-mode command
  *