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linux/drivers/net/wireless/iwlwifi/iwl-trans.h
Emmanuel Grumbach b04db9ac4f iwlwifi: configure the queues from the op_mode 
Since the op_mode defines the queue mapping, let it do it
completely through the API functions.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2012-06-25 09:37:58 +02:00

656 lines
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/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
*
* 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.GPL.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#ifndef __iwl_trans_h__
#define __iwl_trans_h__
#include <linux/ieee80211.h>
#include <linux/mm.h> /* for page_address */
#include "iwl-debug.h"
#include "iwl-config.h"
#include "iwl-fw.h"
/**
* DOC: Transport layer - what is it ?
*
* The tranport layer is the layer that deals with the HW directly. It provides
* an abstraction of the underlying HW to the upper layer. The transport layer
* doesn't provide any policy, algorithm or anything of this kind, but only
* mechanisms to make the HW do something.It is not completely stateless but
* close to it.
* We will have an implementation for each different supported bus.
*/
/**
* DOC: Life cycle of the transport layer
*
* The transport layer has a very precise life cycle.
*
* 1) A helper function is called during the module initialization and
* registers the bus driver's ops with the transport's alloc function.
* 2) Bus's probe calls to the transport layer's allocation functions.
* Of course this function is bus specific.
* 3) This allocation functions will spawn the upper layer which will
* register mac80211.
*
* 4) At some point (i.e. mac80211's start call), the op_mode will call
* the following sequence:
* start_hw
* start_fw
*
* 5) Then when finished (or reset):
* stop_fw (a.k.a. stop device for the moment)
* stop_hw
*
* 6) Eventually, the free function will be called.
*/
/**
* DOC: Host command section
*
* A host command is a commaned issued by the upper layer to the fw. There are
* several versions of fw that have several APIs. The transport layer is
* completely agnostic to these differences.
* The transport does provide helper functionnality (i.e. SYNC / ASYNC mode),
*/
#define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
#define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
#define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
#define SEQ_TO_QUEUE(s) (((s) >> 8) & 0x1f)
#define QUEUE_TO_SEQ(q) (((q) & 0x1f) << 8)
#define SEQ_TO_INDEX(s) ((s) & 0xff)
#define INDEX_TO_SEQ(i) ((i) & 0xff)
#define SEQ_RX_FRAME cpu_to_le16(0x8000)
/**
* struct iwl_cmd_header
*
* This header format appears in the beginning of each command sent from the
* driver, and each response/notification received from uCode.
*/
struct iwl_cmd_header {
u8 cmd; /* Command ID: REPLY_RXON, etc. */
u8 flags; /* 0:5 reserved, 6 abort, 7 internal */
/*
* The driver sets up the sequence number to values of its choosing.
* uCode does not use this value, but passes it back to the driver
* when sending the response to each driver-originated command, so
* the driver can match the response to the command. Since the values
* don't get used by uCode, the driver may set up an arbitrary format.
*
* There is one exception: uCode sets bit 15 when it originates
* the response/notification, i.e. when the response/notification
* is not a direct response to a command sent by the driver. For
* example, uCode issues REPLY_RX when it sends a received frame
* to the driver; it is not a direct response to any driver command.
*
* The Linux driver uses the following format:
*
* 0:7 tfd index - position within TX queue
* 8:12 TX queue id
* 13:14 reserved
* 15 unsolicited RX or uCode-originated notification
*/
__le16 sequence;
} __packed;
/* iwl_cmd_header flags value */
#define IWL_CMD_FAILED_MSK 0x40
#define FH_RSCSR_FRAME_SIZE_MSK 0x00003FFF /* bits 0-13 */
#define FH_RSCSR_FRAME_INVALID 0x55550000
#define FH_RSCSR_FRAME_ALIGN 0x40
struct iwl_rx_packet {
/*
* The first 4 bytes of the RX frame header contain both the RX frame
* size and some flags.
* Bit fields:
* 31: flag flush RB request
* 30: flag ignore TC (terminal counter) request
* 29: flag fast IRQ request
* 28-14: Reserved
* 13-00: RX frame size
*/
__le32 len_n_flags;
struct iwl_cmd_header hdr;
u8 data[];
} __packed;
/**
* enum CMD_MODE - how to send the host commands ?
*
* @CMD_SYNC: The caller will be stalled until the fw responds to the command
* @CMD_ASYNC: Return right away and don't want for the response
* @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
* response.
* @CMD_ON_DEMAND: This command is sent by the test mode pipe.
*/
enum CMD_MODE {
CMD_SYNC = 0,
CMD_ASYNC = BIT(0),
CMD_WANT_SKB = BIT(1),
CMD_ON_DEMAND = BIT(2),
};
#define DEF_CMD_PAYLOAD_SIZE 320
/**
* struct iwl_device_cmd
*
* For allocation of the command and tx queues, this establishes the overall
* size of the largest command we send to uCode, except for commands that
* aren't fully copied and use other TFD space.
*/
struct iwl_device_cmd {
struct iwl_cmd_header hdr; /* uCode API */
u8 payload[DEF_CMD_PAYLOAD_SIZE];
} __packed;
#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
#define IWL_MAX_CMD_TFDS 2
/**
* struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
*
* IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
* ring. The transport layer doesn't map the command's buffer to DMA, but
* rather copies it to an previously allocated DMA buffer. This flag tells
* the transport layer not to copy the command, but to map the existing
* buffer. This can save memcpy and is worth with very big comamnds.
*/
enum iwl_hcmd_dataflag {
IWL_HCMD_DFL_NOCOPY = BIT(0),
};
/**
* struct iwl_host_cmd - Host command to the uCode
*
* @data: array of chunks that composes the data of the host command
* @resp_pkt: response packet, if %CMD_WANT_SKB was set
* @_rx_page_order: (internally used to free response packet)
* @_rx_page_addr: (internally used to free response packet)
* @handler_status: return value of the handler of the command
* (put in setup_rx_handlers) - valid for SYNC mode only
* @flags: can be CMD_*
* @len: array of the lenths of the chunks in data
* @dataflags: IWL_HCMD_DFL_*
* @id: id of the host command
*/
struct iwl_host_cmd {
const void *data[IWL_MAX_CMD_TFDS];
struct iwl_rx_packet *resp_pkt;
unsigned long _rx_page_addr;
u32 _rx_page_order;
int handler_status;
u32 flags;
u16 len[IWL_MAX_CMD_TFDS];
u8 dataflags[IWL_MAX_CMD_TFDS];
u8 id;
};
static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
{
free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
}
struct iwl_rx_cmd_buffer {
struct page *_page;
int _offset;
bool _page_stolen;
unsigned int truesize;
};
static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
{
return (void *)((unsigned long)page_address(r->_page) + r->_offset);
}
static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
{
return r->_offset;
}
static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
{
r->_page_stolen = true;
get_page(r->_page);
return r->_page;
}
#define MAX_NO_RECLAIM_CMDS 6
#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
/*
* Maximum number of HW queues the transport layer
* currently supports
*/
#define IWL_MAX_HW_QUEUES 32
#define IWL_INVALID_STATION 255
#define IWL_MAX_TID_COUNT 8
#define IWL_FRAME_LIMIT 64
/**
* struct iwl_trans_config - transport configuration
*
* @op_mode: pointer to the upper layer.
* @cmd_queue: the index of the command queue.
* Must be set before start_fw.
* @cmd_fifo: the fifo for host commands
* @no_reclaim_cmds: Some devices erroneously don't set the
* SEQ_RX_FRAME bit on some notifications, this is the
* list of such notifications to filter. Max length is
* %MAX_NO_RECLAIM_CMDS.
* @n_no_reclaim_cmds: # of commands in list
* @rx_buf_size_8k: 8 kB RX buffer size needed for A-MSDUs,
* if unset 4k will be the RX buffer size
* @queue_watchdog_timeout: time (in ms) after which queues
* are considered stuck and will trigger device restart
* @command_names: array of command names, must be 256 entries
* (one for each command); for debugging only
*/
struct iwl_trans_config {
struct iwl_op_mode *op_mode;
u8 cmd_queue;
u8 cmd_fifo;
const u8 *no_reclaim_cmds;
int n_no_reclaim_cmds;
bool rx_buf_size_8k;
unsigned int queue_watchdog_timeout;
const char **command_names;
};
struct iwl_trans;
/**
* struct iwl_trans_ops - transport specific operations
*
* All the handlers MUST be implemented
*
* @start_hw: starts the HW- from that point on, the HW can send interrupts
* May sleep
* @stop_hw: stops the HW- from that point on, the HW will be in low power but
* will still issue interrupt if the HW RF kill is triggered unless
* op_mode_leaving is true.
* May sleep
* @start_fw: allocates and inits all the resources for the transport
* layer. Also kick a fw image.
* May sleep
* @fw_alive: called when the fw sends alive notification
* May sleep
* @stop_device:stops the whole device (embedded CPU put to reset)
* May sleep
* @wowlan_suspend: put the device into the correct mode for WoWLAN during
* suspend. This is optional, if not implemented WoWLAN will not be
* supported. This callback may sleep.
* @send_cmd:send a host command
* May sleep only if CMD_SYNC is set
* @tx: send an skb
* Must be atomic
* @reclaim: free packet until ssn. Returns a list of freed packets.
* Must be atomic
* @txq_enable: setup a queue. To setup an AC queue, use the
* iwl_trans_ac_txq_enable wrapper. fw_alive must have been called before
* this one. The op_mode must not configure the HCMD queue. May sleep.
* @txq_disable: de-configure a Tx queue to send AMPDUs
* Must be atomic
* @wait_tx_queue_empty: wait until all tx queues are empty
* May sleep
* @dbgfs_register: add the dbgfs files under this directory. Files will be
* automatically deleted.
* @suspend: stop the device unless WoWLAN is configured
* @resume: resume activity of the device
* @write8: write a u8 to a register at offset ofs from the BAR
* @write32: write a u32 to a register at offset ofs from the BAR
* @read32: read a u32 register at offset ofs from the BAR
* @configure: configure parameters required by the transport layer from
* the op_mode. May be called several times before start_fw, can't be
* called after that.
* @set_pmi: set the power pmi state
*/
struct iwl_trans_ops {
int (*start_hw)(struct iwl_trans *iwl_trans);
void (*stop_hw)(struct iwl_trans *iwl_trans, bool op_mode_leaving);
int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw);
void (*fw_alive)(struct iwl_trans *trans);
void (*stop_device)(struct iwl_trans *trans);
void (*wowlan_suspend)(struct iwl_trans *trans);
int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
struct iwl_device_cmd *dev_cmd, int queue);
void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
struct sk_buff_head *skbs);
void (*txq_enable)(struct iwl_trans *trans, int queue, int fifo,
int sta_id, int tid, int frame_limit, u16 ssn);
void (*txq_disable)(struct iwl_trans *trans, int queue);
int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
int (*wait_tx_queue_empty)(struct iwl_trans *trans);
#ifdef CONFIG_PM_SLEEP
int (*suspend)(struct iwl_trans *trans);
int (*resume)(struct iwl_trans *trans);
#endif
void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
u32 (*read32)(struct iwl_trans *trans, u32 ofs);
void (*configure)(struct iwl_trans *trans,
const struct iwl_trans_config *trans_cfg);
void (*set_pmi)(struct iwl_trans *trans, bool state);
};
/**
* enum iwl_trans_state - state of the transport layer
*
* @IWL_TRANS_NO_FW: no fw has sent an alive response
* @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
*/
enum iwl_trans_state {
IWL_TRANS_NO_FW = 0,
IWL_TRANS_FW_ALIVE = 1,
};
/**
* struct iwl_trans - transport common data
*
* @ops - pointer to iwl_trans_ops
* @op_mode - pointer to the op_mode
* @cfg - pointer to the configuration
* @reg_lock - protect hw register access
* @dev - pointer to struct device * that represents the device
* @hw_id: a u32 with the ID of the device / subdevice.
* Set during transport allocation.
* @hw_id_str: a string with info about HW ID. Set during transport allocation.
* @pm_support: set to true in start_hw if link pm is supported
* @wait_command_queue: the wait_queue for SYNC host commands
* @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
* The user should use iwl_trans_{alloc,free}_tx_cmd.
* @dev_cmd_headroom: room needed for the transport's private use before the
* device_cmd for Tx - for internal use only
* The user should use iwl_trans_{alloc,free}_tx_cmd.
*/
struct iwl_trans {
const struct iwl_trans_ops *ops;
struct iwl_op_mode *op_mode;
const struct iwl_cfg *cfg;
enum iwl_trans_state state;
spinlock_t reg_lock;
struct device *dev;
u32 hw_rev;
u32 hw_id;
char hw_id_str[52];
bool pm_support;
wait_queue_head_t wait_command_queue;
/* The following fields are internal only */
struct kmem_cache *dev_cmd_pool;
size_t dev_cmd_headroom;
/* pointer to trans specific struct */
/*Ensure that this pointer will always be aligned to sizeof pointer */
char trans_specific[0] __aligned(sizeof(void *));
};
static inline void iwl_trans_configure(struct iwl_trans *trans,
const struct iwl_trans_config *trans_cfg)
{
/*
* only set the op_mode for the moment. Later on, this function will do
* more
*/
trans->op_mode = trans_cfg->op_mode;
trans->ops->configure(trans, trans_cfg);
}
static inline int iwl_trans_start_hw(struct iwl_trans *trans)
{
might_sleep();
return trans->ops->start_hw(trans);
}
static inline void iwl_trans_stop_hw(struct iwl_trans *trans,
bool op_mode_leaving)
{
might_sleep();
trans->ops->stop_hw(trans, op_mode_leaving);
trans->state = IWL_TRANS_NO_FW;
}
static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
{
might_sleep();
trans->state = IWL_TRANS_FW_ALIVE;
trans->ops->fw_alive(trans);
}
static inline int iwl_trans_start_fw(struct iwl_trans *trans,
const struct fw_img *fw)
{
might_sleep();
return trans->ops->start_fw(trans, fw);
}
static inline void iwl_trans_stop_device(struct iwl_trans *trans)
{
might_sleep();
trans->ops->stop_device(trans);
trans->state = IWL_TRANS_NO_FW;
}
static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
{
might_sleep();
trans->ops->wowlan_suspend(trans);
}
static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
struct iwl_host_cmd *cmd)
{
WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
"%s bad state = %d", __func__, trans->state);
return trans->ops->send_cmd(trans, cmd);
}
static inline struct iwl_device_cmd *
iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
{
u8 *dev_cmd_ptr = kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);
if (unlikely(dev_cmd_ptr == NULL))
return NULL;
return (struct iwl_device_cmd *)
(dev_cmd_ptr + trans->dev_cmd_headroom);
}
static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
struct iwl_device_cmd *dev_cmd)
{
u8 *dev_cmd_ptr = (u8 *)dev_cmd - trans->dev_cmd_headroom;
kmem_cache_free(trans->dev_cmd_pool, dev_cmd_ptr);
}
static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
struct iwl_device_cmd *dev_cmd, int queue)
{
WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
"%s bad state = %d", __func__, trans->state);
return trans->ops->tx(trans, skb, dev_cmd, queue);
}
static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
int ssn, struct sk_buff_head *skbs)
{
WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
"%s bad state = %d", __func__, trans->state);
trans->ops->reclaim(trans, queue, ssn, skbs);
}
static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue)
{
WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
"%s bad state = %d", __func__, trans->state);
trans->ops->txq_disable(trans, queue);
}
static inline void iwl_trans_txq_enable(struct iwl_trans *trans, int queue,
int fifo, int sta_id, int tid,
int frame_limit, u16 ssn)
{
might_sleep();
WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
"%s bad state = %d", __func__, trans->state);
trans->ops->txq_enable(trans, queue, fifo, sta_id, tid,
frame_limit, ssn);
}
static inline void iwl_trans_ac_txq_enable(struct iwl_trans *trans, int queue,
int fifo)
{
iwl_trans_txq_enable(trans, queue, fifo, IWL_INVALID_STATION,
IWL_MAX_TID_COUNT, IWL_FRAME_LIMIT, 0);
}
static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
{
WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
"%s bad state = %d", __func__, trans->state);
return trans->ops->wait_tx_queue_empty(trans);
}
static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
struct dentry *dir)
{
return trans->ops->dbgfs_register(trans, dir);
}
#ifdef CONFIG_PM_SLEEP
static inline int iwl_trans_suspend(struct iwl_trans *trans)
{
return trans->ops->suspend(trans);
}
static inline int iwl_trans_resume(struct iwl_trans *trans)
{
return trans->ops->resume(trans);
}
#endif
static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
{
trans->ops->write8(trans, ofs, val);
}
static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
{
trans->ops->write32(trans, ofs, val);
}
static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
{
return trans->ops->read32(trans, ofs);
}
static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
{
trans->ops->set_pmi(trans, state);
}
/*****************************************************
* driver (transport) register/unregister functions
******************************************************/
int __must_check iwl_pci_register_driver(void);
void iwl_pci_unregister_driver(void);
#endif /* __iwl_trans_h__ */
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