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Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h new file mode 100644 index 000000000000..2b6756e8b8f9 --- /dev/null +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h @@ -0,0 +1,436 @@ +/****************************************************************************** + * + * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved. + * + * Portions of this file are derived from the ipw3945 project, as well + * as portions of the ieee80211 subsystem header files. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA + * + * The full GNU General Public License is included in this distribution in the + * file called LICENSE. + * + * Contact Information: + * Intel Linux Wireless <ilw@linux.intel.com> + * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + * + *****************************************************************************/ +#ifndef __iwl_trans_int_pcie_h__ +#define __iwl_trans_int_pcie_h__ + +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/skbuff.h> +#include <linux/pci.h> + +#include "iwl-fh.h" +#include "iwl-csr.h" +#include "iwl-shared.h" +#include "iwl-trans.h" +#include "iwl-debug.h" +#include "iwl-io.h" + +struct iwl_tx_queue; +struct iwl_queue; +struct iwl_host_cmd; + +/*This file includes the declaration that are internal to the + * trans_pcie layer */ + +/** + * struct isr_statistics - interrupt statistics + * + */ +struct isr_statistics { + u32 hw; + u32 sw; + u32 err_code; + u32 sch; + u32 alive; + u32 rfkill; + u32 ctkill; + u32 wakeup; + u32 rx; + u32 tx; + u32 unhandled; +}; + +/** + * struct iwl_rx_queue - Rx queue + * @bd: driver's pointer to buffer of receive buffer descriptors (rbd) + * @bd_dma: bus address of buffer of receive buffer descriptors (rbd) + * @pool: + * @queue: + * @read: Shared index to newest available Rx buffer + * @write: Shared index to oldest written Rx packet + * @free_count: Number of pre-allocated buffers in rx_free + * @write_actual: + * @rx_free: list of free SKBs for use + * @rx_used: List of Rx buffers with no SKB + * @need_update: flag to indicate we need to update read/write index + * @rb_stts: driver's pointer to receive buffer status + * @rb_stts_dma: bus address of receive buffer status + * @lock: + * + * NOTE: rx_free and rx_used are used as a FIFO for iwl_rx_mem_buffers + */ +struct iwl_rx_queue { + __le32 *bd; + dma_addr_t bd_dma; + struct iwl_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS]; + struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE]; + u32 read; + u32 write; + u32 free_count; + u32 write_actual; + struct list_head rx_free; + struct list_head rx_used; + int need_update; + struct iwl_rb_status *rb_stts; + dma_addr_t rb_stts_dma; + spinlock_t lock; +}; + +struct iwl_dma_ptr { + dma_addr_t dma; + void *addr; + size_t size; +}; + +/* + * This queue number is required for proper operation + * because the ucode will stop/start the scheduler as + * required. + */ +#define IWL_IPAN_MCAST_QUEUE 8 + +struct iwl_cmd_meta { + /* only for SYNC commands, iff the reply skb is wanted */ + struct iwl_host_cmd *source; + + u32 flags; + + DEFINE_DMA_UNMAP_ADDR(mapping); + DEFINE_DMA_UNMAP_LEN(len); +}; + +/* + * Generic queue structure + * + * Contains common data for Rx and Tx queues. + * + * Note the difference between n_bd and n_window: the hardware + * always assumes 256 descriptors, so n_bd is always 256 (unless + * there might be HW changes in the future). For the normal TX + * queues, n_window, which is the size of the software queue data + * is also 256; however, for the command queue, n_window is only + * 32 since we don't need so many commands pending. Since the HW + * still uses 256 BDs for DMA though, n_bd stays 256. As a result, + * the software buffers (in the variables @meta, @txb in struct + * iwl_tx_queue) only have 32 entries, while the HW buffers (@tfds + * in the same struct) have 256. + * This means that we end up with the following: + * HW entries: | 0 | ... | N * 32 | ... | N * 32 + 31 | ... | 255 | + * SW entries: | 0 | ... | 31 | + * where N is a number between 0 and 7. This means that the SW + * data is a window overlayed over the HW queue. + */ +struct iwl_queue { + int n_bd; /* number of BDs in this queue */ + int write_ptr; /* 1-st empty entry (index) host_w*/ + int read_ptr; /* last used entry (index) host_r*/ + /* use for monitoring and recovering the stuck queue */ + dma_addr_t dma_addr; /* physical addr for BD's */ + int n_window; /* safe queue window */ + u32 id; + int low_mark; /* low watermark, resume queue if free + * space more than this */ + int high_mark; /* high watermark, stop queue if free + * space less than this */ +}; + +/** + * struct iwl_tx_queue - Tx Queue for DMA + * @q: generic Rx/Tx queue descriptor + * @bd: base of circular buffer of TFDs + * @cmd: array of command/TX buffer pointers + * @meta: array of meta data for each command/tx buffer + * @dma_addr_cmd: physical address of cmd/tx buffer array + * @txb: array of per-TFD driver data + * @time_stamp: time (in jiffies) of last read_ptr change + * @need_update: indicates need to update read/write index + * @sched_retry: indicates queue is high-throughput aggregation (HT AGG) enabled + * @sta_id: valid if sched_retry is set + * @tid: valid if sched_retry is set + * + * A Tx queue consists of circular buffer of BDs (a.k.a. TFDs, transmit frame + * descriptors) and required locking structures. + */ +#define TFD_TX_CMD_SLOTS 256 +#define TFD_CMD_SLOTS 32 + +struct iwl_tx_queue { + struct iwl_queue q; + struct iwl_tfd *tfds; + struct iwl_device_cmd **cmd; + struct iwl_cmd_meta *meta; + struct sk_buff **skbs; + unsigned long time_stamp; + u8 need_update; + u8 sched_retry; + u8 active; + u8 swq_id; + + u16 sta_id; + u16 tid; +}; + +/** + * struct iwl_trans_pcie - PCIe transport specific data + * @rxq: all the RX queue data + * @rx_replenish: work that will be called when buffers need to be allocated + * @trans: pointer to the generic transport area + * @scd_base_addr: scheduler sram base address in SRAM + * @scd_bc_tbls: pointer to the byte count table of the scheduler + * @kw: keep warm address + * @ac_to_fifo: to what fifo is a specifc AC mapped ? + * @ac_to_queue: to what tx queue is a specifc AC mapped ? + * @mcast_queue: + * @txq: Tx DMA processing queues + * @txq_ctx_active_msk: what queue is active + * queue_stopped: tracks what queue is stopped + * queue_stop_count: tracks what SW queue is stopped + */ +struct iwl_trans_pcie { + struct iwl_rx_queue rxq; + struct work_struct rx_replenish; + struct iwl_trans *trans; + + /* INT ICT Table */ + __le32 *ict_tbl; + void *ict_tbl_vir; + dma_addr_t ict_tbl_dma; + dma_addr_t aligned_ict_tbl_dma; + int ict_index; + u32 inta; + bool use_ict; + struct tasklet_struct irq_tasklet; + struct isr_statistics isr_stats; + + u32 inta_mask; + u32 scd_base_addr; + struct iwl_dma_ptr scd_bc_tbls; + struct iwl_dma_ptr kw; + + const u8 *ac_to_fifo[NUM_IWL_RXON_CTX]; + const u8 *ac_to_queue[NUM_IWL_RXON_CTX]; + u8 mcast_queue[NUM_IWL_RXON_CTX]; + + struct iwl_tx_queue *txq; + unsigned long txq_ctx_active_msk; +#define IWL_MAX_HW_QUEUES 32 + unsigned long queue_stopped[BITS_TO_LONGS(IWL_MAX_HW_QUEUES)]; + atomic_t queue_stop_count[4]; +}; + +#define IWL_TRANS_GET_PCIE_TRANS(_iwl_trans) \ + ((struct iwl_trans_pcie *) ((_iwl_trans)->trans_specific)) + +/***************************************************** +* RX +******************************************************/ +void iwl_bg_rx_replenish(struct work_struct *data); +void iwl_irq_tasklet(struct iwl_trans *trans); +void iwlagn_rx_replenish(struct iwl_trans *trans); +void iwl_rx_queue_update_write_ptr(struct iwl_trans *trans, + struct iwl_rx_queue *q); + +/***************************************************** +* ICT +******************************************************/ +int iwl_reset_ict(struct iwl_trans *trans); +void iwl_disable_ict(struct iwl_trans *trans); +int iwl_alloc_isr_ict(struct iwl_trans *trans); +void iwl_free_isr_ict(struct iwl_trans *trans); +irqreturn_t iwl_isr_ict(int irq, void *data); + +/***************************************************** +* TX / HCMD +******************************************************/ +void iwl_txq_update_write_ptr(struct iwl_trans *trans, + struct iwl_tx_queue *txq); +int iwlagn_txq_attach_buf_to_tfd(struct iwl_trans *trans, + struct iwl_tx_queue *txq, + dma_addr_t addr, u16 len, u8 reset); +int iwl_queue_init(struct iwl_queue *q, int count, int slots_num, u32 id); +int iwl_trans_pcie_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd); +void iwl_tx_cmd_complete(struct iwl_trans *trans, + struct iwl_rx_mem_buffer *rxb, int handler_status); +void iwl_trans_txq_update_byte_cnt_tbl(struct iwl_trans *trans, + struct iwl_tx_queue *txq, + u16 byte_cnt); +void iwl_trans_pcie_txq_agg_disable(struct iwl_trans *trans, int txq_id); +int iwl_trans_pcie_tx_agg_disable(struct iwl_trans *trans, + enum iwl_rxon_context_id ctx, int sta_id, + int tid); +void iwl_trans_set_wr_ptrs(struct iwl_trans *trans, int txq_id, u32 index); +void iwl_trans_tx_queue_set_status(struct iwl_trans *trans, + struct iwl_tx_queue *txq, + int tx_fifo_id, int scd_retry); +int iwl_trans_pcie_tx_agg_alloc(struct iwl_trans *trans, + enum iwl_rxon_context_id ctx, int sta_id, + int tid, u16 *ssn); +void iwl_trans_pcie_tx_agg_setup(struct iwl_trans *trans, + enum iwl_rxon_context_id ctx, + int sta_id, int tid, int frame_limit); +void iwlagn_txq_free_tfd(struct iwl_trans *trans, struct iwl_tx_queue *txq, + int index, enum dma_data_direction dma_dir); +int iwl_tx_queue_reclaim(struct iwl_trans *trans, int txq_id, int index, + struct sk_buff_head *skbs); +int iwl_queue_space(const struct iwl_queue *q); + +/***************************************************** +* Error handling +******************************************************/ +int iwl_dump_nic_event_log(struct iwl_trans *trans, bool full_log, + char **buf, bool display); +int iwl_dump_fh(struct iwl_trans *trans, char **buf, bool display); +void iwl_dump_csr(struct iwl_trans *trans); + +/***************************************************** +* Helpers +******************************************************/ +static inline void iwl_disable_interrupts(struct iwl_trans *trans) +{ + clear_bit(STATUS_INT_ENABLED, &trans->shrd->status); + + /* disable interrupts from uCode/NIC to host */ + iwl_write32(bus(trans), CSR_INT_MASK, 0x00000000); + + /* acknowledge/clear/reset any interrupts still pending + * from uCode or flow handler (Rx/Tx DMA) */ + iwl_write32(bus(trans), CSR_INT, 0xffffffff); + iwl_write32(bus(trans), CSR_FH_INT_STATUS, 0xffffffff); + IWL_DEBUG_ISR(trans, "Disabled interrupts\n"); +} + +static inline void iwl_enable_interrupts(struct iwl_trans *trans) +{ + struct iwl_trans_pcie *trans_pcie = + IWL_TRANS_GET_PCIE_TRANS(trans); + + IWL_DEBUG_ISR(trans, "Enabling interrupts\n"); + set_bit(STATUS_INT_ENABLED, &trans->shrd->status); + iwl_write32(bus(trans), CSR_INT_MASK, trans_pcie->inta_mask); +} + +/* + * we have 8 bits used like this: + * + * 7 6 5 4 3 2 1 0 + * | | | | | | | | + * | | | | | | +-+-------- AC queue (0-3) + * | | | | | | + * | +-+-+-+-+------------ HW queue ID + * | + * +---------------------- unused + */ +static inline void iwl_set_swq_id(struct iwl_tx_queue *txq, u8 ac, u8 hwq) +{ + BUG_ON(ac > 3); /* only have 2 bits */ + BUG_ON(hwq > 31); /* only use 5 bits */ + + txq->swq_id = (hwq << 2) | ac; +} + +static inline void iwl_wake_queue(struct iwl_trans *trans, + struct iwl_tx_queue *txq) +{ + u8 queue = txq->swq_id; + u8 ac = queue & 3; + u8 hwq = (queue >> 2) & 0x1f; + struct iwl_trans_pcie *trans_pcie = + IWL_TRANS_GET_PCIE_TRANS(trans); + + if (test_and_clear_bit(hwq, trans_pcie->queue_stopped)) + if (atomic_dec_return(&trans_pcie->queue_stop_count[ac]) <= 0) + iwl_wake_sw_queue(priv(trans), ac); +} + +static inline void iwl_stop_queue(struct iwl_trans *trans, + struct iwl_tx_queue *txq) +{ + u8 queue = txq->swq_id; + u8 ac = queue & 3; + u8 hwq = (queue >> 2) & 0x1f; + struct iwl_trans_pcie *trans_pcie = + IWL_TRANS_GET_PCIE_TRANS(trans); + + if (!test_and_set_bit(hwq, trans_pcie->queue_stopped)) + if (atomic_inc_return(&trans_pcie->queue_stop_count[ac]) > 0) + iwl_stop_sw_queue(priv(trans), ac); +} + +#ifdef ieee80211_stop_queue +#undef ieee80211_stop_queue +#endif + +#define ieee80211_stop_queue DO_NOT_USE_ieee80211_stop_queue + +#ifdef ieee80211_wake_queue +#undef ieee80211_wake_queue +#endif + +#define ieee80211_wake_queue DO_NOT_USE_ieee80211_wake_queue + +static inline void iwl_txq_ctx_activate(struct iwl_trans_pcie *trans_pcie, + int txq_id) +{ + set_bit(txq_id, &trans_pcie->txq_ctx_active_msk); +} + +static inline void iwl_txq_ctx_deactivate(struct iwl_trans_pcie *trans_pcie, + int txq_id) +{ + clear_bit(txq_id, &trans_pcie->txq_ctx_active_msk); +} + +static inline int iwl_queue_used(const struct iwl_queue *q, int i) +{ + return q->write_ptr >= q->read_ptr ? + (i >= q->read_ptr && i < q->write_ptr) : + !(i < q->read_ptr && i >= q->write_ptr); +} + +static inline u8 get_cmd_index(struct iwl_queue *q, u32 index) +{ + return index & (q->n_window - 1); +} + +#define IWL_TX_FIFO_BK 0 /* shared */ +#define IWL_TX_FIFO_BE 1 +#define IWL_TX_FIFO_VI 2 /* shared */ +#define IWL_TX_FIFO_VO 3 +#define IWL_TX_FIFO_BK_IPAN IWL_TX_FIFO_BK +#define IWL_TX_FIFO_BE_IPAN 4 +#define IWL_TX_FIFO_VI_IPAN IWL_TX_FIFO_VI +#define IWL_TX_FIFO_VO_IPAN 5 +/* re-uses the VO FIFO, uCode will properly flush/schedule */ +#define IWL_TX_FIFO_AUX 5 +#define IWL_TX_FIFO_UNUSED -1 + +/* AUX (TX during scan dwell) queue */ +#define IWL_AUX_QUEUE 10 + +#endif /* __iwl_trans_int_pcie_h__ */ |