[PATCH] zd1211rw: Defer firmware load until first ifup

While playing with the firmware a while back, I discovered a way to
access the device's entire address space before the firmware has been
loaded.

Previously we were loading the firmware early on (during probe) so that
we could read the MAC address from the EEPROM and register a netdevice.
Now that we can read the EEPROM without having firmware, we can defer
firmware loading until later while still reading the MAC address early
on.

This has the advantage that zd1211rw can now be built into the kernel --
previously if this was the case, zd1211rw would be loaded before the
filesystem is available and firmware loading would fail.

Firmware load and other device initialization operations now happen the
first time the interface is brought up.

Some architectural changes were needed: handling of the is_zd1211b flag
was moved into the zd_usb structure, MAC address handling was obviously
changed, and a preinit_hw stage was added (the order is now: init,
preinit_hw, init_hw).

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 73 deletions

diff --git a/drivers/net/wireless/zd1211rw/zd_chip.c b/drivers/net/wireless/zd1211rw/zd_chip.c
index 5b624bfc01a6..c39f1984b84d 100644
--- a/drivers/net/wireless/zd1211rw/zd_chip.c
+++ b/drivers/net/wireless/zd1211rw/zd_chip.c
@@ -49,8 +49,9 @@ void zd_chip_clear(struct zd_chip *chip)
         ZD_MEMCLEAR(chip, sizeof(*chip));
 }
 
-static int scnprint_mac_oui(const u8 *addr, char *buffer, size_t size)
+static int scnprint_mac_oui(struct zd_chip *chip, char *buffer, size_t size)
 {
+        u8 *addr = zd_usb_to_netdev(&chip->usb)->dev_addr;
         return scnprintf(buffer, size, "%02x-%02x-%02x",
                          addr[0], addr[1], addr[2]);
 }
@@ -61,10 +62,10 @@ static int scnprint_id(struct zd_chip *chip, char *buffer, size_t size)
         int i = 0;
 
         i = scnprintf(buffer, size, "zd1211%s chip ",
-                      chip->is_zd1211b ? "b" : "");
+                      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->e2p_mac, 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,
@@ -366,64 +367,9 @@ error:
         return r;
 }
 
-static int _read_mac_addr(struct zd_chip *chip, u8 *mac_addr,
-                          const zd_addr_t *addr)
-{
-        int r;
-        u32 parts[2];
-
-        r = zd_ioread32v_locked(chip, parts, (const zd_addr_t *)addr, 2);
-        if (r) {
-                dev_dbg_f(zd_chip_dev(chip),
-                        "error: couldn't read e2p macs. Error number %d\n", r);
-                return r;
-        }
-
-        mac_addr[0] = parts[0];
-        mac_addr[1] = parts[0] >>  8;
-        mac_addr[2] = parts[0] >> 16;
-        mac_addr[3] = parts[0] >> 24;
-        mac_addr[4] = parts[1];
-        mac_addr[5] = parts[1] >>  8;
-
-        return 0;
-}
-
-static int read_e2p_mac_addr(struct zd_chip *chip)
-{
-        static const zd_addr_t addr[2] = { E2P_MAC_ADDR_P1, E2P_MAC_ADDR_P2 };
-
-        ZD_ASSERT(mutex_is_locked(&chip->mutex));
-        return _read_mac_addr(chip, chip->e2p_mac, (const zd_addr_t *)addr);
-}
-
 /* MAC address: if custom mac addresses are to to be used CR_MAC_ADDR_P1 and
  *              CR_MAC_ADDR_P2 must be overwritten
  */
-void zd_get_e2p_mac_addr(struct zd_chip *chip, u8 *mac_addr)
-{
-        mutex_lock(&chip->mutex);
-        memcpy(mac_addr, chip->e2p_mac, ETH_ALEN);
-        mutex_unlock(&chip->mutex);
-}
-
-static int read_mac_addr(struct zd_chip *chip, u8 *mac_addr)
-{
-        static const zd_addr_t addr[2] = { CR_MAC_ADDR_P1, CR_MAC_ADDR_P2 };
-        return _read_mac_addr(chip, mac_addr, (const zd_addr_t *)addr);
-}
-
-int zd_read_mac_addr(struct zd_chip *chip, u8 *mac_addr)
-{
-        int r;
-
-        dev_dbg_f(zd_chip_dev(chip), "\n");
-        mutex_lock(&chip->mutex);
-        r = read_mac_addr(chip, mac_addr);
-        mutex_unlock(&chip->mutex);
-        return r;
-}
-
 int zd_write_mac_addr(struct zd_chip *chip, const u8 *mac_addr)
 {
         int r;
@@ -444,12 +390,6 @@ int zd_write_mac_addr(struct zd_chip *chip, const u8 *mac_addr)
 
         mutex_lock(&chip->mutex);
         r = zd_iowrite32a_locked(chip, reqs, ARRAY_SIZE(reqs));
-#ifdef DEBUG
-        {
-                u8 tmp[ETH_ALEN];
-                read_mac_addr(chip, tmp);
-        }
-#endif /* DEBUG */
         mutex_unlock(&chip->mutex);
         return r;
 }
@@ -809,7 +749,7 @@ out:
 
 static int hw_reset_phy(struct zd_chip *chip)
 {
-        return chip->is_zd1211b ? zd1211b_hw_reset_phy(chip) :
+        return zd_chip_is_zd1211b(chip) ? zd1211b_hw_reset_phy(chip) :
                                   zd1211_hw_reset_phy(chip);
 }
 
@@ -874,7 +814,7 @@ static int hw_init_hmac(struct zd_chip *chip)
         if (r)
                 return r;
 
-        return chip->is_zd1211b ?
+        return zd_chip_is_zd1211b(chip) ?
                 zd1211b_hw_init_hmac(chip) : zd1211_hw_init_hmac(chip);
 }
 
@@ -1136,8 +1076,15 @@ static int read_fw_regs_offset(struct zd_chip *chip)
         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, u8 device_type)
+int zd_chip_init_hw(struct zd_chip *chip)
 {
         int r;
         u8 rf_type;
@@ -1145,7 +1092,6 @@ int zd_chip_init_hw(struct zd_chip *chip, u8 device_type)
         dev_dbg_f(zd_chip_dev(chip), "\n");
 
         mutex_lock(&chip->mutex);
-        chip->is_zd1211b = (device_type == DEVICE_ZD1211B) != 0;
 
 #ifdef DEBUG
         r = test_init(chip);
@@ -1201,10 +1147,6 @@ int zd_chip_init_hw(struct zd_chip *chip, u8 device_type)
                 goto out;
 #endif /* DEBUG */
 
-        r = read_e2p_mac_addr(chip);
-        if (r)
-                goto out;
-
         r = read_cal_int_tables(chip);
         if (r)
                 goto out;
@@ -1259,7 +1201,7 @@ static int update_channel_integration_and_calibration(struct zd_chip *chip,
         r = update_pwr_int(chip, channel);
         if (r)
                 return r;
-        if (chip->is_zd1211b) {
+        if (zd_chip_is_zd1211b(chip)) {
                 static const struct zd_ioreq16 ioreqs[] = {
                         { CR69, 0x28 },
                         {},