newbus IO ordering semantics - moving forward

[Adrian Chadd]

This is the offending code. Ah, I had it wrong - lots of writes,
followed by a read:

uint32_t
ar5212GetRadioRev(struct ath_hal *ah)
{
        uint32_t val;
        int i;

        /* Read Radio Chip Rev Extract */
        OS_REG_WRITE(ah, AR_PHY(0x34), 0x00001c16);
        for (i = 0; i < 8; i++)
                OS_REG_WRITE(ah, AR_PHY(0x20), 0x00010000);
        val = (OS_REG_READ(ah, AR_PHY(256)) >> 24) & 0xff;
        val = ((val & 0xf0) >> 4) | ((val & 0x0f) << 4);
        return ath_hal_reverseBits(val, 8);
}