b43: Fix chip access validation for new devices

[deliverable/linux.git] / drivers / net / wireless / b43 / main.c

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index f4c14272332bbe982232a7edeef3324b033200ca..6b3013c2d96d29b9bfa953f2b2174eac47ac0aba 100644 (file)
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2408,32 +2408,42 @@ static void b43_periodic_tasks_setup(struct b43_wldev *dev)
        queue_delayed_work(dev->wl->hw->workqueue, work, 0);
 }
 
-/* Validate access to the chip (SHM) */
+/* Check if communication with the device works correctly. */
 static int b43_validate_chipaccess(struct b43_wldev *dev)
 {
-       u32 value;
-       u32 shm_backup;
+       u32 v, backup;
 
-       shm_backup = b43_shm_read32(dev, B43_SHM_SHARED, 0);
-       b43_shm_write32(dev, B43_SHM_SHARED, 0, 0xAA5555AA);
-       if (b43_shm_read32(dev, B43_SHM_SHARED, 0) != 0xAA5555AA)
-               goto error;
+       backup = b43_shm_read32(dev, B43_SHM_SHARED, 0);
+
+       /* Check for read/write and endianness problems. */
        b43_shm_write32(dev, B43_SHM_SHARED, 0, 0x55AAAA55);
        if (b43_shm_read32(dev, B43_SHM_SHARED, 0) != 0x55AAAA55)
                goto error;
-       b43_shm_write32(dev, B43_SHM_SHARED, 0, shm_backup);
-
-       value = b43_read32(dev, B43_MMIO_MACCTL);
-       if ((value | B43_MACCTL_GMODE) !=
-           (B43_MACCTL_GMODE | B43_MACCTL_IHR_ENABLED))
+       b43_shm_write32(dev, B43_SHM_SHARED, 0, 0xAA5555AA);
+       if (b43_shm_read32(dev, B43_SHM_SHARED, 0) != 0xAA5555AA)
                goto error;
 
-       value = b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);
-       if (value)
+       b43_shm_write32(dev, B43_SHM_SHARED, 0, backup);
+
+       if ((dev->dev->id.revision >= 3) && (dev->dev->id.revision <= 10)) {
+               /* The 32bit register shadows the two 16bit registers
+                * with update sideeffects. Validate this. */
+               b43_write16(dev, B43_MMIO_TSF_CFP_START, 0xAAAA);
+               b43_write32(dev, B43_MMIO_TSF_CFP_START, 0xCCCCBBBB);
+               if (b43_read16(dev, B43_MMIO_TSF_CFP_START_LOW) != 0xBBBB)
+                       goto error;
+               if (b43_read16(dev, B43_MMIO_TSF_CFP_START_HIGH) != 0xCCCC)
+                       goto error;
+       }
+       b43_write32(dev, B43_MMIO_TSF_CFP_START, 0);
+
+       v = b43_read32(dev, B43_MMIO_MACCTL);
+       v |= B43_MACCTL_GMODE;
+       if (v != (B43_MACCTL_GMODE | B43_MACCTL_IHR_ENABLED))
                goto error;
 
        return 0;
-      error:
+error:
        b43err(dev->wl, "Failed to validate the chipaccess\n");
        return -ENODEV;
 }