606 lines
16 KiB
C
606 lines
16 KiB
C
/*
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* Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
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* Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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/*************************************\
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* DMA and interrupt masking functions *
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\*************************************/
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/*
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* dma.c - DMA and interrupt masking functions
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*
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* Here we setup descriptor pointers (rxdp/txdp) start/stop dma engine and
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* handle queue setup for 5210 chipset (rest are handled on qcu.c).
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* Also we setup interrupt mask register (IMR) and read the various iterrupt
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* status registers (ISR).
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*
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* TODO: Handle SISR on 5211+ and introduce a function to return the queue
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* number that resulted the interrupt.
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*/
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#include "ath5k.h"
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#include "reg.h"
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#include "debug.h"
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#include "base.h"
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/*********\
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* Receive *
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\*********/
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/**
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* ath5k_hw_start_rx_dma - Start DMA receive
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*
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* @ah: The &struct ath5k_hw
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*/
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void ath5k_hw_start_rx_dma(struct ath5k_hw *ah)
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{
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ATH5K_TRACE(ah->ah_sc);
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ath5k_hw_reg_write(ah, AR5K_CR_RXE, AR5K_CR);
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ath5k_hw_reg_read(ah, AR5K_CR);
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}
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/**
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* ath5k_hw_stop_rx_dma - Stop DMA receive
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*
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* @ah: The &struct ath5k_hw
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*/
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int ath5k_hw_stop_rx_dma(struct ath5k_hw *ah)
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{
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unsigned int i;
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ATH5K_TRACE(ah->ah_sc);
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ath5k_hw_reg_write(ah, AR5K_CR_RXD, AR5K_CR);
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/*
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* It may take some time to disable the DMA receive unit
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*/
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for (i = 1000; i > 0 &&
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(ath5k_hw_reg_read(ah, AR5K_CR) & AR5K_CR_RXE) != 0;
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i--)
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udelay(10);
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return i ? 0 : -EBUSY;
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}
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/**
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* ath5k_hw_get_rxdp - Get RX Descriptor's address
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*
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* @ah: The &struct ath5k_hw
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*
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* XXX: Is RXDP read and clear ?
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*/
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u32 ath5k_hw_get_rxdp(struct ath5k_hw *ah)
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{
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return ath5k_hw_reg_read(ah, AR5K_RXDP);
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}
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/**
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* ath5k_hw_set_rxdp - Set RX Descriptor's address
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*
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* @ah: The &struct ath5k_hw
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* @phys_addr: RX descriptor address
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*
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* XXX: Should we check if rx is enabled before setting rxdp ?
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*/
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void ath5k_hw_set_rxdp(struct ath5k_hw *ah, u32 phys_addr)
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{
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ATH5K_TRACE(ah->ah_sc);
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ath5k_hw_reg_write(ah, phys_addr, AR5K_RXDP);
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}
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/**********\
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* Transmit *
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\**********/
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/**
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* ath5k_hw_start_tx_dma - Start DMA transmit for a specific queue
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*
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* @ah: The &struct ath5k_hw
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* @queue: The hw queue number
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*
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* Start DMA transmit for a specific queue and since 5210 doesn't have
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* QCU/DCU, set up queue parameters for 5210 here based on queue type (one
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* queue for normal data and one queue for beacons). For queue setup
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* on newer chips check out qcu.c. Returns -EINVAL if queue number is out
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* of range or if queue is already disabled.
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*
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* NOTE: Must be called after setting up tx control descriptor for that
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* queue (see below).
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*/
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int ath5k_hw_start_tx_dma(struct ath5k_hw *ah, unsigned int queue)
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{
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u32 tx_queue;
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ATH5K_TRACE(ah->ah_sc);
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AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
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/* Return if queue is declared inactive */
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if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE)
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return -EIO;
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if (ah->ah_version == AR5K_AR5210) {
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tx_queue = ath5k_hw_reg_read(ah, AR5K_CR);
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/*
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* Set the queue by type on 5210
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*/
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switch (ah->ah_txq[queue].tqi_type) {
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case AR5K_TX_QUEUE_DATA:
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tx_queue |= AR5K_CR_TXE0 & ~AR5K_CR_TXD0;
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break;
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case AR5K_TX_QUEUE_BEACON:
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tx_queue |= AR5K_CR_TXE1 & ~AR5K_CR_TXD1;
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ath5k_hw_reg_write(ah, AR5K_BCR_TQ1V | AR5K_BCR_BDMAE,
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AR5K_BSR);
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break;
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case AR5K_TX_QUEUE_CAB:
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tx_queue |= AR5K_CR_TXE1 & ~AR5K_CR_TXD1;
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ath5k_hw_reg_write(ah, AR5K_BCR_TQ1FV | AR5K_BCR_TQ1V |
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AR5K_BCR_BDMAE, AR5K_BSR);
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break;
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default:
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return -EINVAL;
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}
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/* Start queue */
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ath5k_hw_reg_write(ah, tx_queue, AR5K_CR);
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ath5k_hw_reg_read(ah, AR5K_CR);
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} else {
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/* Return if queue is disabled */
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if (AR5K_REG_READ_Q(ah, AR5K_QCU_TXD, queue))
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return -EIO;
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/* Start queue */
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AR5K_REG_WRITE_Q(ah, AR5K_QCU_TXE, queue);
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}
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return 0;
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}
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/**
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* ath5k_hw_stop_tx_dma - Stop DMA transmit on a specific queue
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*
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* @ah: The &struct ath5k_hw
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* @queue: The hw queue number
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*
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* Stop DMA transmit on a specific hw queue and drain queue so we don't
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* have any pending frames. Returns -EBUSY if we still have pending frames,
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* -EINVAL if queue number is out of range.
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*
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*/
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int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue)
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{
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unsigned int i = 40;
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u32 tx_queue, pending;
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ATH5K_TRACE(ah->ah_sc);
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AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
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/* Return if queue is declared inactive */
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if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE)
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return -EIO;
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if (ah->ah_version == AR5K_AR5210) {
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tx_queue = ath5k_hw_reg_read(ah, AR5K_CR);
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/*
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* Set by queue type
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*/
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switch (ah->ah_txq[queue].tqi_type) {
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case AR5K_TX_QUEUE_DATA:
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tx_queue |= AR5K_CR_TXD0 & ~AR5K_CR_TXE0;
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break;
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case AR5K_TX_QUEUE_BEACON:
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case AR5K_TX_QUEUE_CAB:
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/* XXX Fix me... */
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tx_queue |= AR5K_CR_TXD1 & ~AR5K_CR_TXD1;
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ath5k_hw_reg_write(ah, 0, AR5K_BSR);
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break;
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default:
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return -EINVAL;
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}
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/* Stop queue */
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ath5k_hw_reg_write(ah, tx_queue, AR5K_CR);
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ath5k_hw_reg_read(ah, AR5K_CR);
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} else {
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/*
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* Schedule TX disable and wait until queue is empty
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*/
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AR5K_REG_WRITE_Q(ah, AR5K_QCU_TXD, queue);
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/*Check for pending frames*/
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do {
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pending = ath5k_hw_reg_read(ah,
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AR5K_QUEUE_STATUS(queue)) &
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AR5K_QCU_STS_FRMPENDCNT;
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udelay(100);
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} while (--i && pending);
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/* For 2413+ order PCU to drop packets using
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* QUIET mechanism */
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if (ah->ah_mac_version >= (AR5K_SREV_AR2414 >> 4) &&
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pending){
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/* Set periodicity and duration */
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ath5k_hw_reg_write(ah,
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AR5K_REG_SM(100, AR5K_QUIET_CTL2_QT_PER)|
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AR5K_REG_SM(10, AR5K_QUIET_CTL2_QT_DUR),
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AR5K_QUIET_CTL2);
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/* Enable quiet period for current TSF */
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ath5k_hw_reg_write(ah,
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AR5K_QUIET_CTL1_QT_EN |
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AR5K_REG_SM(ath5k_hw_reg_read(ah,
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AR5K_TSF_L32_5211) >> 10,
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AR5K_QUIET_CTL1_NEXT_QT_TSF),
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AR5K_QUIET_CTL1);
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/* Force channel idle high */
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AR5K_REG_ENABLE_BITS(ah, AR5K_DIAG_SW_5211,
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AR5K_DIAG_SW_CHANEL_IDLE_HIGH);
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/* Wait a while and disable mechanism */
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udelay(200);
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AR5K_REG_DISABLE_BITS(ah, AR5K_QUIET_CTL1,
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AR5K_QUIET_CTL1_QT_EN);
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/* Re-check for pending frames */
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i = 40;
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do {
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pending = ath5k_hw_reg_read(ah,
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AR5K_QUEUE_STATUS(queue)) &
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AR5K_QCU_STS_FRMPENDCNT;
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udelay(100);
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} while (--i && pending);
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AR5K_REG_DISABLE_BITS(ah, AR5K_DIAG_SW_5211,
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AR5K_DIAG_SW_CHANEL_IDLE_HIGH);
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}
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/* Clear register */
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ath5k_hw_reg_write(ah, 0, AR5K_QCU_TXD);
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if (pending)
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return -EBUSY;
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}
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/* TODO: Check for success on 5210 else return error */
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return 0;
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}
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/**
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* ath5k_hw_get_txdp - Get TX Descriptor's address for a specific queue
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*
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* @ah: The &struct ath5k_hw
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* @queue: The hw queue number
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*
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* Get TX descriptor's address for a specific queue. For 5210 we ignore
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* the queue number and use tx queue type since we only have 2 queues.
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* We use TXDP0 for normal data queue and TXDP1 for beacon queue.
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* For newer chips with QCU/DCU we just read the corresponding TXDP register.
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*
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* XXX: Is TXDP read and clear ?
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*/
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u32 ath5k_hw_get_txdp(struct ath5k_hw *ah, unsigned int queue)
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{
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u16 tx_reg;
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ATH5K_TRACE(ah->ah_sc);
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AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
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/*
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* Get the transmit queue descriptor pointer from the selected queue
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*/
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/*5210 doesn't have QCU*/
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if (ah->ah_version == AR5K_AR5210) {
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switch (ah->ah_txq[queue].tqi_type) {
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case AR5K_TX_QUEUE_DATA:
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tx_reg = AR5K_NOQCU_TXDP0;
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break;
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case AR5K_TX_QUEUE_BEACON:
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case AR5K_TX_QUEUE_CAB:
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tx_reg = AR5K_NOQCU_TXDP1;
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break;
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default:
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return 0xffffffff;
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}
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} else {
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tx_reg = AR5K_QUEUE_TXDP(queue);
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}
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return ath5k_hw_reg_read(ah, tx_reg);
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}
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/**
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* ath5k_hw_set_txdp - Set TX Descriptor's address for a specific queue
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*
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* @ah: The &struct ath5k_hw
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* @queue: The hw queue number
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*
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* Set TX descriptor's address for a specific queue. For 5210 we ignore
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* the queue number and we use tx queue type since we only have 2 queues
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* so as above we use TXDP0 for normal data queue and TXDP1 for beacon queue.
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* For newer chips with QCU/DCU we just set the corresponding TXDP register.
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* Returns -EINVAL if queue type is invalid for 5210 and -EIO if queue is still
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* active.
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*/
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int ath5k_hw_set_txdp(struct ath5k_hw *ah, unsigned int queue, u32 phys_addr)
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{
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u16 tx_reg;
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ATH5K_TRACE(ah->ah_sc);
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AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
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/*
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* Set the transmit queue descriptor pointer register by type
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* on 5210
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*/
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if (ah->ah_version == AR5K_AR5210) {
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switch (ah->ah_txq[queue].tqi_type) {
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case AR5K_TX_QUEUE_DATA:
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tx_reg = AR5K_NOQCU_TXDP0;
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break;
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case AR5K_TX_QUEUE_BEACON:
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case AR5K_TX_QUEUE_CAB:
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tx_reg = AR5K_NOQCU_TXDP1;
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break;
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default:
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return -EINVAL;
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}
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} else {
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/*
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* Set the transmit queue descriptor pointer for
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* the selected queue on QCU for 5211+
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* (this won't work if the queue is still active)
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*/
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if (AR5K_REG_READ_Q(ah, AR5K_QCU_TXE, queue))
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return -EIO;
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tx_reg = AR5K_QUEUE_TXDP(queue);
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}
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/* Set descriptor pointer */
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ath5k_hw_reg_write(ah, phys_addr, tx_reg);
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return 0;
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}
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/**
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* ath5k_hw_update_tx_triglevel - Update tx trigger level
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*
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* @ah: The &struct ath5k_hw
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* @increase: Flag to force increase of trigger level
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*
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* This function increases/decreases the tx trigger level for the tx fifo
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* buffer (aka FIFO threshold) that is used to indicate when PCU flushes
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* the buffer and transmits it's data. Lowering this results sending small
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* frames more quickly but can lead to tx underruns, raising it a lot can
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* result other problems (i think bmiss is related). Right now we start with
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* the lowest possible (64Bytes) and if we get tx underrun we increase it using
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* the increase flag. Returns -EIO if we have have reached maximum/minimum.
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*
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* XXX: Link this with tx DMA size ?
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* XXX: Use it to save interrupts ?
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* TODO: Needs testing, i think it's related to bmiss...
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*/
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int ath5k_hw_update_tx_triglevel(struct ath5k_hw *ah, bool increase)
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{
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u32 trigger_level, imr;
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int ret = -EIO;
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ATH5K_TRACE(ah->ah_sc);
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/*
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* Disable interrupts by setting the mask
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*/
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imr = ath5k_hw_set_imr(ah, ah->ah_imr & ~AR5K_INT_GLOBAL);
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trigger_level = AR5K_REG_MS(ath5k_hw_reg_read(ah, AR5K_TXCFG),
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AR5K_TXCFG_TXFULL);
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if (!increase) {
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if (--trigger_level < AR5K_TUNE_MIN_TX_FIFO_THRES)
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goto done;
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} else
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trigger_level +=
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((AR5K_TUNE_MAX_TX_FIFO_THRES - trigger_level) / 2);
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/*
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* Update trigger level on success
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*/
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if (ah->ah_version == AR5K_AR5210)
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ath5k_hw_reg_write(ah, trigger_level, AR5K_TRIG_LVL);
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else
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AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
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AR5K_TXCFG_TXFULL, trigger_level);
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ret = 0;
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done:
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/*
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* Restore interrupt mask
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*/
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ath5k_hw_set_imr(ah, imr);
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return ret;
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}
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/*******************\
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* Interrupt masking *
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\*******************/
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/**
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* ath5k_hw_is_intr_pending - Check if we have pending interrupts
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*
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* @ah: The &struct ath5k_hw
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*
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* Check if we have pending interrupts to process. Returns 1 if we
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* have pending interrupts and 0 if we haven't.
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*/
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bool ath5k_hw_is_intr_pending(struct ath5k_hw *ah)
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{
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ATH5K_TRACE(ah->ah_sc);
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return ath5k_hw_reg_read(ah, AR5K_INTPEND) == 1 ? 1 : 0;
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}
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/**
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* ath5k_hw_get_isr - Get interrupt status
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*
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* @ah: The @struct ath5k_hw
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* @interrupt_mask: Driver's interrupt mask used to filter out
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* interrupts in sw.
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*
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* This function is used inside our interrupt handler to determine the reason
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* for the interrupt by reading Primary Interrupt Status Register. Returns an
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* abstract interrupt status mask which is mostly ISR with some uncommon bits
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* being mapped on some standard non hw-specific positions
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* (check out &ath5k_int).
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*
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* NOTE: We use read-and-clear register, so after this function is called ISR
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* is zeroed.
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*
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* XXX: Why filter interrupts in sw with interrupt_mask ? No benefit at all
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* plus it can be misleading (one might thing that we save interrupts this way)
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*/
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int ath5k_hw_get_isr(struct ath5k_hw *ah, enum ath5k_int *interrupt_mask)
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{
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u32 data;
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ATH5K_TRACE(ah->ah_sc);
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/*
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* Read interrupt status from the Interrupt Status register
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* on 5210
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*/
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if (ah->ah_version == AR5K_AR5210) {
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data = ath5k_hw_reg_read(ah, AR5K_ISR);
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if (unlikely(data == AR5K_INT_NOCARD)) {
|
|
*interrupt_mask = data;
|
|
return -ENODEV;
|
|
}
|
|
} else {
|
|
/*
|
|
* Read interrupt status from the Read-And-Clear
|
|
* shadow register.
|
|
* Note: PISR/SISR Not available on 5210
|
|
*/
|
|
data = ath5k_hw_reg_read(ah, AR5K_RAC_PISR);
|
|
}
|
|
|
|
/*
|
|
* Get abstract interrupt mask (driver-compatible)
|
|
*/
|
|
*interrupt_mask = (data & AR5K_INT_COMMON) & ah->ah_imr;
|
|
|
|
if (unlikely(data == AR5K_INT_NOCARD))
|
|
return -ENODEV;
|
|
|
|
if (data & (AR5K_ISR_RXOK | AR5K_ISR_RXERR))
|
|
*interrupt_mask |= AR5K_INT_RX;
|
|
|
|
if (data & (AR5K_ISR_TXOK | AR5K_ISR_TXERR
|
|
| AR5K_ISR_TXDESC | AR5K_ISR_TXEOL))
|
|
*interrupt_mask |= AR5K_INT_TX;
|
|
|
|
if (ah->ah_version != AR5K_AR5210) {
|
|
/*HIU = Host Interface Unit (PCI etc)*/
|
|
if (unlikely(data & (AR5K_ISR_HIUERR)))
|
|
*interrupt_mask |= AR5K_INT_FATAL;
|
|
|
|
/*Beacon Not Ready*/
|
|
if (unlikely(data & (AR5K_ISR_BNR)))
|
|
*interrupt_mask |= AR5K_INT_BNR;
|
|
}
|
|
|
|
/*
|
|
* XXX: BMISS interrupts may occur after association.
|
|
* I found this on 5210 code but it needs testing. If this is
|
|
* true we should disable them before assoc and re-enable them
|
|
* after a successfull assoc + some jiffies.
|
|
*/
|
|
#if 0
|
|
interrupt_mask &= ~AR5K_INT_BMISS;
|
|
#endif
|
|
|
|
/*
|
|
* In case we didn't handle anything,
|
|
* print the register value.
|
|
*/
|
|
if (unlikely(*interrupt_mask == 0 && net_ratelimit()))
|
|
ATH5K_PRINTF("0x%08x\n", data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ath5k_hw_set_imr - Set interrupt mask
|
|
*
|
|
* @ah: The &struct ath5k_hw
|
|
* @new_mask: The new interrupt mask to be set
|
|
*
|
|
* Set the interrupt mask in hw to save interrupts. We do that by mapping
|
|
* ath5k_int bits to hw-specific bits to remove abstraction and writing
|
|
* Interrupt Mask Register.
|
|
*/
|
|
enum ath5k_int ath5k_hw_set_imr(struct ath5k_hw *ah, enum ath5k_int new_mask)
|
|
{
|
|
enum ath5k_int old_mask, int_mask;
|
|
|
|
/*
|
|
* Disable card interrupts to prevent any race conditions
|
|
* (they will be re-enabled afterwards).
|
|
*/
|
|
ath5k_hw_reg_write(ah, AR5K_IER_DISABLE, AR5K_IER);
|
|
ath5k_hw_reg_read(ah, AR5K_IER);
|
|
|
|
old_mask = ah->ah_imr;
|
|
|
|
/*
|
|
* Add additional, chipset-dependent interrupt mask flags
|
|
* and write them to the IMR (interrupt mask register).
|
|
*/
|
|
int_mask = new_mask & AR5K_INT_COMMON;
|
|
|
|
if (new_mask & AR5K_INT_RX)
|
|
int_mask |= AR5K_IMR_RXOK | AR5K_IMR_RXERR | AR5K_IMR_RXORN |
|
|
AR5K_IMR_RXDESC;
|
|
|
|
if (new_mask & AR5K_INT_TX)
|
|
int_mask |= AR5K_IMR_TXOK | AR5K_IMR_TXERR | AR5K_IMR_TXDESC |
|
|
AR5K_IMR_TXURN;
|
|
|
|
if (ah->ah_version != AR5K_AR5210) {
|
|
if (new_mask & AR5K_INT_FATAL) {
|
|
int_mask |= AR5K_IMR_HIUERR;
|
|
AR5K_REG_ENABLE_BITS(ah, AR5K_SIMR2, AR5K_SIMR2_MCABT |
|
|
AR5K_SIMR2_SSERR | AR5K_SIMR2_DPERR);
|
|
}
|
|
}
|
|
|
|
ath5k_hw_reg_write(ah, int_mask, AR5K_PIMR);
|
|
|
|
/* Store new interrupt mask */
|
|
ah->ah_imr = new_mask;
|
|
|
|
/* ..re-enable interrupts */
|
|
ath5k_hw_reg_write(ah, AR5K_IER_ENABLE, AR5K_IER);
|
|
ath5k_hw_reg_read(ah, AR5K_IER);
|
|
|
|
return old_mask;
|
|
}
|
|
|