| /****************************************************************************** |
| * |
| * 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 |
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| * (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-shared.h" |
| #include "iwl-debug.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. |
| */ |
| |
| struct iwl_priv; |
| struct iwl_shared; |
| struct iwl_op_mode; |
| struct fw_img; |
| struct sk_buff; |
| struct dentry; |
| |
| /** |
| * 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; |
| |
| |
| #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; |
| }; |
| |
| 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 |
| |
| /* |
| * Maximum number of HW queues the transport layer |
| * currently supports |
| */ |
| #define IWL_MAX_HW_QUEUES 32 |
| |
| /** |
| * struct iwl_trans_config - transport configuration |
| * |
| * @op_mode: pointer to the upper layer. |
| * @queue_to_fifo: queue to FIFO mapping to set up by |
| * default |
| * @n_queue_to_fifo: number of queues to set up |
| * @cmd_queue: the index of the command queue. |
| * Must be set before start_fw. |
| * @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; |
| const u8 *queue_to_fifo; |
| u8 n_queue_to_fifo; |
| |
| u8 cmd_queue; |
| 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_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. |
| * 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 |
| * @tx_agg_setup: setup a tx queue for AMPDU - will be called once the HW is |
| * ready and a successful ADDBA response has been received. |
| * May sleep |
| * @tx_agg_disable: de-configure a Tx queue to send AMPDUs |
| * Must be atomic |
| * @free: release all the ressource for the transport layer itself such as |
| * irq, tasklet etc... From this point on, the device may not issue |
| * any interrupt (incl. RFKILL). |
| * May sleep |
| * @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); |
| 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 (*tx_agg_setup)(struct iwl_trans *trans, int queue, int fifo, |
| int sta_id, int tid, int frame_limit, u16 ssn); |
| void (*tx_agg_disable)(struct iwl_trans *trans, int queue); |
| |
| void (*free)(struct iwl_trans *trans); |
| |
| 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 |
| * @shrd - pointer to iwl_shared which holds shared data from the upper layer |
| * @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 |
| */ |
| struct iwl_trans { |
| const struct iwl_trans_ops *ops; |
| struct iwl_op_mode *op_mode; |
| struct iwl_shared *shrd; |
| 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; |
| |
| /* 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) |
| { |
| might_sleep(); |
| |
| trans->ops->stop_hw(trans); |
| |
| trans->state = IWL_TRANS_NO_FW; |
| } |
| |
| static inline void iwl_trans_fw_alive(struct iwl_trans *trans) |
| { |
| might_sleep(); |
| |
| trans->ops->fw_alive(trans); |
| |
| trans->state = IWL_TRANS_FW_ALIVE; |
| } |
| |
| 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 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_tx_agg_disable(struct iwl_trans *trans, int queue) |
| { |
| WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE, |
| "%s bad state = %d", __func__, trans->state); |
| |
| trans->ops->tx_agg_disable(trans, queue); |
| } |
| |
| static inline void iwl_trans_tx_agg_setup(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->tx_agg_setup(trans, queue, fifo, sta_id, tid, |
| frame_limit, ssn); |
| } |
| |
| static inline void iwl_trans_free(struct iwl_trans *trans) |
| { |
| trans->ops->free(trans); |
| } |
| |
| 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); |
| } |
| |
| /***************************************************** |
| * Transport layers implementations + their allocation function |
| ******************************************************/ |
| struct pci_dev; |
| struct pci_device_id; |
| extern const struct iwl_trans_ops trans_ops_pcie; |
| struct iwl_trans *iwl_trans_pcie_alloc(struct iwl_shared *shrd, |
| struct pci_dev *pdev, |
| const struct pci_device_id *ent, |
| const struct iwl_cfg *cfg); |
| int __must_check iwl_pci_register_driver(void); |
| void iwl_pci_unregister_driver(void); |
| |
| extern const struct iwl_trans_ops trans_ops_idi; |
| struct iwl_trans *iwl_trans_idi_alloc(struct iwl_shared *shrd, |
| void *pdev_void, |
| const void *ent_void, |
| const struct iwl_cfg *cfg); |
| #endif /* __iwl_trans_h__ */ |