1320 lines
32 KiB
C
1320 lines
32 KiB
C
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/*
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* Copyright (c) 2015, Sony Mobile Communications AB.
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/smd.h>
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#include <linux/soc/qcom/smem.h>
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#include <linux/wait.h>
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/*
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* The Qualcomm Shared Memory communication solution provides point-to-point
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* channels for clients to send and receive streaming or packet based data.
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*
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* Each channel consists of a control item (channel info) and a ring buffer
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* pair. The channel info carry information related to channel state, flow
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* control and the offsets within the ring buffer.
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*
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* All allocated channels are listed in an allocation table, identifying the
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* pair of items by name, type and remote processor.
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*
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* Upon creating a new channel the remote processor allocates channel info and
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* ring buffer items from the smem heap and populate the allocation table. An
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* interrupt is sent to the other end of the channel and a scan for new
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* channels should be done. A channel never goes away, it will only change
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* state.
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*
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* The remote processor signals it intent for bring up the communication
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* channel by setting the state of its end of the channel to "opening" and
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* sends out an interrupt. We detect this change and register a smd device to
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* consume the channel. Upon finding a consumer we finish the handshake and the
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* channel is up.
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*
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* Upon closing a channel, the remote processor will update the state of its
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* end of the channel and signal us, we will then unregister any attached
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* device and close our end of the channel.
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*
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* Devices attached to a channel can use the qcom_smd_send function to push
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* data to the channel, this is done by copying the data into the tx ring
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* buffer, updating the pointers in the channel info and signaling the remote
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* processor.
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*
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* The remote processor does the equivalent when it transfer data and upon
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* receiving the interrupt we check the channel info for new data and delivers
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* this to the attached device. If the device is not ready to receive the data
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* we leave it in the ring buffer for now.
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*/
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struct smd_channel_info;
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struct smd_channel_info_word;
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#define SMD_ALLOC_TBL_COUNT 2
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#define SMD_ALLOC_TBL_SIZE 64
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/*
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* This lists the various smem heap items relevant for the allocation table and
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* smd channel entries.
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*/
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static const struct {
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unsigned alloc_tbl_id;
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unsigned info_base_id;
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unsigned fifo_base_id;
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} smem_items[SMD_ALLOC_TBL_COUNT] = {
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{
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.alloc_tbl_id = 13,
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.info_base_id = 14,
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.fifo_base_id = 338
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},
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{
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.alloc_tbl_id = 14,
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.info_base_id = 266,
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.fifo_base_id = 202,
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},
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};
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/**
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* struct qcom_smd_edge - representing a remote processor
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* @smd: handle to qcom_smd
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* @of_node: of_node handle for information related to this edge
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* @edge_id: identifier of this edge
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* @irq: interrupt for signals on this edge
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* @ipc_regmap: regmap handle holding the outgoing ipc register
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* @ipc_offset: offset within @ipc_regmap of the register for ipc
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* @ipc_bit: bit in the register at @ipc_offset of @ipc_regmap
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* @channels: list of all channels detected on this edge
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* @channels_lock: guard for modifications of @channels
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* @allocated: array of bitmaps representing already allocated channels
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* @need_rescan: flag that the @work needs to scan smem for new channels
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* @smem_available: last available amount of smem triggering a channel scan
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* @work: work item for edge house keeping
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*/
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struct qcom_smd_edge {
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struct qcom_smd *smd;
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struct device_node *of_node;
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unsigned edge_id;
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int irq;
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struct regmap *ipc_regmap;
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int ipc_offset;
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int ipc_bit;
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struct list_head channels;
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spinlock_t channels_lock;
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DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE);
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bool need_rescan;
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unsigned smem_available;
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struct work_struct work;
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};
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/*
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* SMD channel states.
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*/
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enum smd_channel_state {
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SMD_CHANNEL_CLOSED,
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SMD_CHANNEL_OPENING,
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SMD_CHANNEL_OPENED,
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SMD_CHANNEL_FLUSHING,
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SMD_CHANNEL_CLOSING,
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SMD_CHANNEL_RESET,
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SMD_CHANNEL_RESET_OPENING
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};
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/**
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* struct qcom_smd_channel - smd channel struct
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* @edge: qcom_smd_edge this channel is living on
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* @qsdev: reference to a associated smd client device
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* @name: name of the channel
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* @state: local state of the channel
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* @remote_state: remote state of the channel
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* @tx_info: byte aligned outgoing channel info
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* @rx_info: byte aligned incoming channel info
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* @tx_info_word: word aligned outgoing channel info
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* @rx_info_word: word aligned incoming channel info
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* @tx_lock: lock to make writes to the channel mutually exclusive
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* @fblockread_event: wakeup event tied to tx fBLOCKREADINTR
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* @tx_fifo: pointer to the outgoing ring buffer
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* @rx_fifo: pointer to the incoming ring buffer
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* @fifo_size: size of each ring buffer
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* @bounce_buffer: bounce buffer for reading wrapped packets
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* @cb: callback function registered for this channel
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* @recv_lock: guard for rx info modifications and cb pointer
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* @pkt_size: size of the currently handled packet
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* @list: lite entry for @channels in qcom_smd_edge
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*/
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struct qcom_smd_channel {
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struct qcom_smd_edge *edge;
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struct qcom_smd_device *qsdev;
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char *name;
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enum smd_channel_state state;
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enum smd_channel_state remote_state;
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struct smd_channel_info *tx_info;
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struct smd_channel_info *rx_info;
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struct smd_channel_info_word *tx_info_word;
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struct smd_channel_info_word *rx_info_word;
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struct mutex tx_lock;
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wait_queue_head_t fblockread_event;
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void *tx_fifo;
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void *rx_fifo;
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int fifo_size;
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void *bounce_buffer;
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int (*cb)(struct qcom_smd_device *, const void *, size_t);
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spinlock_t recv_lock;
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int pkt_size;
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struct list_head list;
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};
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/**
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* struct qcom_smd - smd struct
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* @dev: device struct
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* @num_edges: number of entries in @edges
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* @edges: array of edges to be handled
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*/
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struct qcom_smd {
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struct device *dev;
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unsigned num_edges;
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struct qcom_smd_edge edges[0];
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};
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/*
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* Format of the smd_info smem items, for byte aligned channels.
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*/
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struct smd_channel_info {
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u32 state;
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u8 fDSR;
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u8 fCTS;
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u8 fCD;
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u8 fRI;
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u8 fHEAD;
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u8 fTAIL;
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u8 fSTATE;
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u8 fBLOCKREADINTR;
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u32 tail;
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u32 head;
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};
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/*
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* Format of the smd_info smem items, for word aligned channels.
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*/
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struct smd_channel_info_word {
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u32 state;
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u32 fDSR;
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u32 fCTS;
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u32 fCD;
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u32 fRI;
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u32 fHEAD;
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u32 fTAIL;
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u32 fSTATE;
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u32 fBLOCKREADINTR;
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u32 tail;
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u32 head;
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};
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#define GET_RX_CHANNEL_INFO(channel, param) \
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(channel->rx_info_word ? \
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channel->rx_info_word->param : \
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channel->rx_info->param)
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#define SET_RX_CHANNEL_INFO(channel, param, value) \
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(channel->rx_info_word ? \
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(channel->rx_info_word->param = value) : \
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(channel->rx_info->param = value))
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#define GET_TX_CHANNEL_INFO(channel, param) \
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(channel->tx_info_word ? \
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channel->tx_info_word->param : \
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channel->tx_info->param)
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#define SET_TX_CHANNEL_INFO(channel, param, value) \
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(channel->tx_info_word ? \
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(channel->tx_info_word->param = value) : \
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(channel->tx_info->param = value))
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/**
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* struct qcom_smd_alloc_entry - channel allocation entry
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* @name: channel name
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* @cid: channel index
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* @flags: channel flags and edge id
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* @ref_count: reference count of the channel
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*/
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struct qcom_smd_alloc_entry {
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u8 name[20];
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u32 cid;
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u32 flags;
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u32 ref_count;
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} __packed;
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#define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff
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#define SMD_CHANNEL_FLAGS_STREAM BIT(8)
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#define SMD_CHANNEL_FLAGS_PACKET BIT(9)
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/*
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* Each smd packet contains a 20 byte header, with the first 4 being the length
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* of the packet.
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*/
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#define SMD_PACKET_HEADER_LEN 20
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/*
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* Signal the remote processor associated with 'channel'.
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*/
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static void qcom_smd_signal_channel(struct qcom_smd_channel *channel)
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{
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struct qcom_smd_edge *edge = channel->edge;
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regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit));
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}
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/*
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* Initialize the tx channel info
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*/
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static void qcom_smd_channel_reset(struct qcom_smd_channel *channel)
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{
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SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED);
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SET_TX_CHANNEL_INFO(channel, fDSR, 0);
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SET_TX_CHANNEL_INFO(channel, fCTS, 0);
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SET_TX_CHANNEL_INFO(channel, fCD, 0);
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SET_TX_CHANNEL_INFO(channel, fRI, 0);
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SET_TX_CHANNEL_INFO(channel, fHEAD, 0);
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SET_TX_CHANNEL_INFO(channel, fTAIL, 0);
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SET_TX_CHANNEL_INFO(channel, fSTATE, 1);
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SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 0);
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SET_TX_CHANNEL_INFO(channel, head, 0);
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SET_TX_CHANNEL_INFO(channel, tail, 0);
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qcom_smd_signal_channel(channel);
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channel->state = SMD_CHANNEL_CLOSED;
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channel->pkt_size = 0;
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}
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/*
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* Calculate the amount of data available in the rx fifo
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*/
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static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel)
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{
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unsigned head;
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unsigned tail;
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head = GET_RX_CHANNEL_INFO(channel, head);
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tail = GET_RX_CHANNEL_INFO(channel, tail);
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return (head - tail) & (channel->fifo_size - 1);
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}
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/*
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* Set tx channel state and inform the remote processor
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*/
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static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel,
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int state)
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{
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struct qcom_smd_edge *edge = channel->edge;
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bool is_open = state == SMD_CHANNEL_OPENED;
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if (channel->state == state)
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return;
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dev_dbg(edge->smd->dev, "set_state(%s, %d)\n", channel->name, state);
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SET_TX_CHANNEL_INFO(channel, fDSR, is_open);
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SET_TX_CHANNEL_INFO(channel, fCTS, is_open);
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SET_TX_CHANNEL_INFO(channel, fCD, is_open);
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SET_TX_CHANNEL_INFO(channel, state, state);
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SET_TX_CHANNEL_INFO(channel, fSTATE, 1);
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channel->state = state;
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qcom_smd_signal_channel(channel);
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}
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/*
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* Copy count bytes of data using 32bit accesses, if that's required.
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*/
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static void smd_copy_to_fifo(void __iomem *_dst,
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const void *_src,
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size_t count,
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bool word_aligned)
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{
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u32 *dst = (u32 *)_dst;
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u32 *src = (u32 *)_src;
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if (word_aligned) {
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count /= sizeof(u32);
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while (count--)
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writel_relaxed(*src++, dst++);
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} else {
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memcpy_toio(_dst, _src, count);
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}
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}
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/*
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* Copy count bytes of data using 32bit accesses, if that is required.
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*/
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static void smd_copy_from_fifo(void *_dst,
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const void __iomem *_src,
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size_t count,
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bool word_aligned)
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{
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u32 *dst = (u32 *)_dst;
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u32 *src = (u32 *)_src;
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if (word_aligned) {
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count /= sizeof(u32);
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while (count--)
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*dst++ = readl_relaxed(src++);
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} else {
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memcpy_fromio(_dst, _src, count);
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}
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}
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/*
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* Read count bytes of data from the rx fifo into buf, but don't advance the
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* tail.
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*/
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static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel,
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void *buf, size_t count)
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{
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bool word_aligned;
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unsigned tail;
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size_t len;
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word_aligned = channel->rx_info_word != NULL;
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tail = GET_RX_CHANNEL_INFO(channel, tail);
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len = min_t(size_t, count, channel->fifo_size - tail);
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if (len) {
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smd_copy_from_fifo(buf,
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channel->rx_fifo + tail,
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len,
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word_aligned);
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}
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if (len != count) {
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smd_copy_from_fifo(buf + len,
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channel->rx_fifo,
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count - len,
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word_aligned);
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}
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return count;
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}
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/*
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* Advance the rx tail by count bytes.
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*/
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static void qcom_smd_channel_advance(struct qcom_smd_channel *channel,
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size_t count)
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||
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{
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unsigned tail;
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tail = GET_RX_CHANNEL_INFO(channel, tail);
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||
|
tail += count;
|
||
|
tail &= (channel->fifo_size - 1);
|
||
|
SET_RX_CHANNEL_INFO(channel, tail, tail);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Read out a single packet from the rx fifo and deliver it to the device
|
||
|
*/
|
||
|
static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel)
|
||
|
{
|
||
|
struct qcom_smd_device *qsdev = channel->qsdev;
|
||
|
unsigned tail;
|
||
|
size_t len;
|
||
|
void *ptr;
|
||
|
int ret;
|
||
|
|
||
|
if (!channel->cb)
|
||
|
return 0;
|
||
|
|
||
|
tail = GET_RX_CHANNEL_INFO(channel, tail);
|
||
|
|
||
|
/* Use bounce buffer if the data wraps */
|
||
|
if (tail + channel->pkt_size >= channel->fifo_size) {
|
||
|
ptr = channel->bounce_buffer;
|
||
|
len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size);
|
||
|
} else {
|
||
|
ptr = channel->rx_fifo + tail;
|
||
|
len = channel->pkt_size;
|
||
|
}
|
||
|
|
||
|
ret = channel->cb(qsdev, ptr, len);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
/* Only forward the tail if the client consumed the data */
|
||
|
qcom_smd_channel_advance(channel, len);
|
||
|
|
||
|
channel->pkt_size = 0;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Per channel interrupt handling
|
||
|
*/
|
||
|
static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel)
|
||
|
{
|
||
|
bool need_state_scan = false;
|
||
|
int remote_state;
|
||
|
u32 pktlen;
|
||
|
int avail;
|
||
|
int ret;
|
||
|
|
||
|
/* Handle state changes */
|
||
|
remote_state = GET_RX_CHANNEL_INFO(channel, state);
|
||
|
if (remote_state != channel->remote_state) {
|
||
|
channel->remote_state = remote_state;
|
||
|
need_state_scan = true;
|
||
|
}
|
||
|
/* Indicate that we have seen any state change */
|
||
|
SET_RX_CHANNEL_INFO(channel, fSTATE, 0);
|
||
|
|
||
|
/* Signal waiting qcom_smd_send() about the interrupt */
|
||
|
if (!GET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR))
|
||
|
wake_up_interruptible(&channel->fblockread_event);
|
||
|
|
||
|
/* Don't consume any data until we've opened the channel */
|
||
|
if (channel->state != SMD_CHANNEL_OPENED)
|
||
|
goto out;
|
||
|
|
||
|
/* Indicate that we've seen the new data */
|
||
|
SET_RX_CHANNEL_INFO(channel, fHEAD, 0);
|
||
|
|
||
|
/* Consume data */
|
||
|
for (;;) {
|
||
|
avail = qcom_smd_channel_get_rx_avail(channel);
|
||
|
|
||
|
if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) {
|
||
|
qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen));
|
||
|
qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN);
|
||
|
channel->pkt_size = pktlen;
|
||
|
} else if (channel->pkt_size && avail >= channel->pkt_size) {
|
||
|
ret = qcom_smd_channel_recv_single(channel);
|
||
|
if (ret)
|
||
|
break;
|
||
|
} else {
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Indicate that we have seen and updated tail */
|
||
|
SET_RX_CHANNEL_INFO(channel, fTAIL, 1);
|
||
|
|
||
|
/* Signal the remote that we've consumed the data (if requested) */
|
||
|
if (!GET_RX_CHANNEL_INFO(channel, fBLOCKREADINTR)) {
|
||
|
/* Ensure ordering of channel info updates */
|
||
|
wmb();
|
||
|
|
||
|
qcom_smd_signal_channel(channel);
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
return need_state_scan;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* The edge interrupts are triggered by the remote processor on state changes,
|
||
|
* channel info updates or when new channels are created.
|
||
|
*/
|
||
|
static irqreturn_t qcom_smd_edge_intr(int irq, void *data)
|
||
|
{
|
||
|
struct qcom_smd_edge *edge = data;
|
||
|
struct qcom_smd_channel *channel;
|
||
|
unsigned available;
|
||
|
bool kick_worker = false;
|
||
|
|
||
|
/*
|
||
|
* Handle state changes or data on each of the channels on this edge
|
||
|
*/
|
||
|
spin_lock(&edge->channels_lock);
|
||
|
list_for_each_entry(channel, &edge->channels, list) {
|
||
|
spin_lock(&channel->recv_lock);
|
||
|
kick_worker |= qcom_smd_channel_intr(channel);
|
||
|
spin_unlock(&channel->recv_lock);
|
||
|
}
|
||
|
spin_unlock(&edge->channels_lock);
|
||
|
|
||
|
/*
|
||
|
* Creating a new channel requires allocating an smem entry, so we only
|
||
|
* have to scan if the amount of available space in smem have changed
|
||
|
* since last scan.
|
||
|
*/
|
||
|
available = qcom_smem_get_free_space(edge->edge_id);
|
||
|
if (available != edge->smem_available) {
|
||
|
edge->smem_available = available;
|
||
|
edge->need_rescan = true;
|
||
|
kick_worker = true;
|
||
|
}
|
||
|
|
||
|
if (kick_worker)
|
||
|
schedule_work(&edge->work);
|
||
|
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Delivers any outstanding packets in the rx fifo, can be used after probe of
|
||
|
* the clients to deliver any packets that wasn't delivered before the client
|
||
|
* was setup.
|
||
|
*/
|
||
|
static void qcom_smd_channel_resume(struct qcom_smd_channel *channel)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
|
||
|
spin_lock_irqsave(&channel->recv_lock, flags);
|
||
|
qcom_smd_channel_intr(channel);
|
||
|
spin_unlock_irqrestore(&channel->recv_lock, flags);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Calculate how much space is available in the tx fifo.
|
||
|
*/
|
||
|
static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel)
|
||
|
{
|
||
|
unsigned head;
|
||
|
unsigned tail;
|
||
|
unsigned mask = channel->fifo_size - 1;
|
||
|
|
||
|
head = GET_TX_CHANNEL_INFO(channel, head);
|
||
|
tail = GET_TX_CHANNEL_INFO(channel, tail);
|
||
|
|
||
|
return mask - ((head - tail) & mask);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Write count bytes of data into channel, possibly wrapping in the ring buffer
|
||
|
*/
|
||
|
static int qcom_smd_write_fifo(struct qcom_smd_channel *channel,
|
||
|
const void *data,
|
||
|
size_t count)
|
||
|
{
|
||
|
bool word_aligned;
|
||
|
unsigned head;
|
||
|
size_t len;
|
||
|
|
||
|
word_aligned = channel->tx_info_word != NULL;
|
||
|
head = GET_TX_CHANNEL_INFO(channel, head);
|
||
|
|
||
|
len = min_t(size_t, count, channel->fifo_size - head);
|
||
|
if (len) {
|
||
|
smd_copy_to_fifo(channel->tx_fifo + head,
|
||
|
data,
|
||
|
len,
|
||
|
word_aligned);
|
||
|
}
|
||
|
|
||
|
if (len != count) {
|
||
|
smd_copy_to_fifo(channel->tx_fifo,
|
||
|
data + len,
|
||
|
count - len,
|
||
|
word_aligned);
|
||
|
}
|
||
|
|
||
|
head += count;
|
||
|
head &= (channel->fifo_size - 1);
|
||
|
SET_TX_CHANNEL_INFO(channel, head, head);
|
||
|
|
||
|
return count;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* qcom_smd_send - write data to smd channel
|
||
|
* @channel: channel handle
|
||
|
* @data: buffer of data to write
|
||
|
* @len: number of bytes to write
|
||
|
*
|
||
|
* This is a blocking write of len bytes into the channel's tx ring buffer and
|
||
|
* signal the remote end. It will sleep until there is enough space available
|
||
|
* in the tx buffer, utilizing the fBLOCKREADINTR signaling mechanism to avoid
|
||
|
* polling.
|
||
|
*/
|
||
|
int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len)
|
||
|
{
|
||
|
u32 hdr[5] = {len,};
|
||
|
int tlen = sizeof(hdr) + len;
|
||
|
int ret;
|
||
|
|
||
|
/* Word aligned channels only accept word size aligned data */
|
||
|
if (channel->rx_info_word != NULL && len % 4)
|
||
|
return -EINVAL;
|
||
|
|
||
|
ret = mutex_lock_interruptible(&channel->tx_lock);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
while (qcom_smd_get_tx_avail(channel) < tlen) {
|
||
|
if (channel->state != SMD_CHANNEL_OPENED) {
|
||
|
ret = -EPIPE;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 1);
|
||
|
|
||
|
ret = wait_event_interruptible(channel->fblockread_event,
|
||
|
qcom_smd_get_tx_avail(channel) >= tlen ||
|
||
|
channel->state != SMD_CHANNEL_OPENED);
|
||
|
if (ret)
|
||
|
goto out;
|
||
|
|
||
|
SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 0);
|
||
|
}
|
||
|
|
||
|
SET_TX_CHANNEL_INFO(channel, fTAIL, 0);
|
||
|
|
||
|
qcom_smd_write_fifo(channel, hdr, sizeof(hdr));
|
||
|
qcom_smd_write_fifo(channel, data, len);
|
||
|
|
||
|
SET_TX_CHANNEL_INFO(channel, fHEAD, 1);
|
||
|
|
||
|
/* Ensure ordering of channel info updates */
|
||
|
wmb();
|
||
|
|
||
|
qcom_smd_signal_channel(channel);
|
||
|
|
||
|
out:
|
||
|
mutex_unlock(&channel->tx_lock);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
EXPORT_SYMBOL(qcom_smd_send);
|
||
|
|
||
|
static struct qcom_smd_device *to_smd_device(struct device *dev)
|
||
|
{
|
||
|
return container_of(dev, struct qcom_smd_device, dev);
|
||
|
}
|
||
|
|
||
|
static struct qcom_smd_driver *to_smd_driver(struct device *dev)
|
||
|
{
|
||
|
struct qcom_smd_device *qsdev = to_smd_device(dev);
|
||
|
|
||
|
return container_of(qsdev->dev.driver, struct qcom_smd_driver, driver);
|
||
|
}
|
||
|
|
||
|
static int qcom_smd_dev_match(struct device *dev, struct device_driver *drv)
|
||
|
{
|
||
|
return of_driver_match_device(dev, drv);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Probe the smd client.
|
||
|
*
|
||
|
* The remote side have indicated that it want the channel to be opened, so
|
||
|
* complete the state handshake and probe our client driver.
|
||
|
*/
|
||
|
static int qcom_smd_dev_probe(struct device *dev)
|
||
|
{
|
||
|
struct qcom_smd_device *qsdev = to_smd_device(dev);
|
||
|
struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
|
||
|
struct qcom_smd_channel *channel = qsdev->channel;
|
||
|
size_t bb_size;
|
||
|
int ret;
|
||
|
|
||
|
/*
|
||
|
* Packets are maximum 4k, but reduce if the fifo is smaller
|
||
|
*/
|
||
|
bb_size = min(channel->fifo_size, SZ_4K);
|
||
|
channel->bounce_buffer = kmalloc(bb_size, GFP_KERNEL);
|
||
|
if (!channel->bounce_buffer)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
channel->cb = qsdrv->callback;
|
||
|
|
||
|
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING);
|
||
|
|
||
|
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED);
|
||
|
|
||
|
ret = qsdrv->probe(qsdev);
|
||
|
if (ret)
|
||
|
goto err;
|
||
|
|
||
|
qcom_smd_channel_resume(channel);
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
err:
|
||
|
dev_err(&qsdev->dev, "probe failed\n");
|
||
|
|
||
|
channel->cb = NULL;
|
||
|
kfree(channel->bounce_buffer);
|
||
|
channel->bounce_buffer = NULL;
|
||
|
|
||
|
qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Remove the smd client.
|
||
|
*
|
||
|
* The channel is going away, for some reason, so remove the smd client and
|
||
|
* reset the channel state.
|
||
|
*/
|
||
|
static int qcom_smd_dev_remove(struct device *dev)
|
||
|
{
|
||
|
struct qcom_smd_device *qsdev = to_smd_device(dev);
|
||
|
struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
|
||
|
struct qcom_smd_channel *channel = qsdev->channel;
|
||
|
unsigned long flags;
|
||
|
|
||
|
qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING);
|
||
|
|
||
|
/*
|
||
|
* Make sure we don't race with the code receiving data.
|
||
|
*/
|
||
|
spin_lock_irqsave(&channel->recv_lock, flags);
|
||
|
channel->cb = NULL;
|
||
|
spin_unlock_irqrestore(&channel->recv_lock, flags);
|
||
|
|
||
|
/* Wake up any sleepers in qcom_smd_send() */
|
||
|
wake_up_interruptible(&channel->fblockread_event);
|
||
|
|
||
|
/*
|
||
|
* We expect that the client might block in remove() waiting for any
|
||
|
* outstanding calls to qcom_smd_send() to wake up and finish.
|
||
|
*/
|
||
|
if (qsdrv->remove)
|
||
|
qsdrv->remove(qsdev);
|
||
|
|
||
|
/*
|
||
|
* The client is now gone, cleanup and reset the channel state.
|
||
|
*/
|
||
|
channel->qsdev = NULL;
|
||
|
kfree(channel->bounce_buffer);
|
||
|
channel->bounce_buffer = NULL;
|
||
|
|
||
|
qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
|
||
|
|
||
|
qcom_smd_channel_reset(channel);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct bus_type qcom_smd_bus = {
|
||
|
.name = "qcom_smd",
|
||
|
.match = qcom_smd_dev_match,
|
||
|
.probe = qcom_smd_dev_probe,
|
||
|
.remove = qcom_smd_dev_remove,
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* Release function for the qcom_smd_device object.
|
||
|
*/
|
||
|
static void qcom_smd_release_device(struct device *dev)
|
||
|
{
|
||
|
struct qcom_smd_device *qsdev = to_smd_device(dev);
|
||
|
|
||
|
kfree(qsdev);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Finds the device_node for the smd child interested in this channel.
|
||
|
*/
|
||
|
static struct device_node *qcom_smd_match_channel(struct device_node *edge_node,
|
||
|
const char *channel)
|
||
|
{
|
||
|
struct device_node *child;
|
||
|
const char *name;
|
||
|
const char *key;
|
||
|
int ret;
|
||
|
|
||
|
for_each_available_child_of_node(edge_node, child) {
|
||
|
key = "qcom,smd-channels";
|
||
|
ret = of_property_read_string(child, key, &name);
|
||
|
if (ret) {
|
||
|
of_node_put(child);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (strcmp(name, channel) == 0)
|
||
|
return child;
|
||
|
}
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Create a smd client device for channel that is being opened.
|
||
|
*/
|
||
|
static int qcom_smd_create_device(struct qcom_smd_channel *channel)
|
||
|
{
|
||
|
struct qcom_smd_device *qsdev;
|
||
|
struct qcom_smd_edge *edge = channel->edge;
|
||
|
struct device_node *node;
|
||
|
struct qcom_smd *smd = edge->smd;
|
||
|
int ret;
|
||
|
|
||
|
if (channel->qsdev)
|
||
|
return -EEXIST;
|
||
|
|
||
|
node = qcom_smd_match_channel(edge->of_node, channel->name);
|
||
|
if (!node) {
|
||
|
dev_dbg(smd->dev, "no match for '%s'\n", channel->name);
|
||
|
return -ENXIO;
|
||
|
}
|
||
|
|
||
|
dev_dbg(smd->dev, "registering '%s'\n", channel->name);
|
||
|
|
||
|
qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL);
|
||
|
if (!qsdev)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
dev_set_name(&qsdev->dev, "%s.%s", edge->of_node->name, node->name);
|
||
|
qsdev->dev.parent = smd->dev;
|
||
|
qsdev->dev.bus = &qcom_smd_bus;
|
||
|
qsdev->dev.release = qcom_smd_release_device;
|
||
|
qsdev->dev.of_node = node;
|
||
|
|
||
|
qsdev->channel = channel;
|
||
|
|
||
|
channel->qsdev = qsdev;
|
||
|
|
||
|
ret = device_register(&qsdev->dev);
|
||
|
if (ret) {
|
||
|
dev_err(smd->dev, "device_register failed: %d\n", ret);
|
||
|
put_device(&qsdev->dev);
|
||
|
}
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Destroy a smd client device for a channel that's going away.
|
||
|
*/
|
||
|
static void qcom_smd_destroy_device(struct qcom_smd_channel *channel)
|
||
|
{
|
||
|
struct device *dev;
|
||
|
|
||
|
BUG_ON(!channel->qsdev);
|
||
|
|
||
|
dev = &channel->qsdev->dev;
|
||
|
|
||
|
device_unregister(dev);
|
||
|
of_node_put(dev->of_node);
|
||
|
put_device(dev);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* qcom_smd_driver_register - register a smd driver
|
||
|
* @qsdrv: qcom_smd_driver struct
|
||
|
*/
|
||
|
int qcom_smd_driver_register(struct qcom_smd_driver *qsdrv)
|
||
|
{
|
||
|
qsdrv->driver.bus = &qcom_smd_bus;
|
||
|
return driver_register(&qsdrv->driver);
|
||
|
}
|
||
|
EXPORT_SYMBOL(qcom_smd_driver_register);
|
||
|
|
||
|
/**
|
||
|
* qcom_smd_driver_unregister - unregister a smd driver
|
||
|
* @qsdrv: qcom_smd_driver struct
|
||
|
*/
|
||
|
void qcom_smd_driver_unregister(struct qcom_smd_driver *qsdrv)
|
||
|
{
|
||
|
driver_unregister(&qsdrv->driver);
|
||
|
}
|
||
|
EXPORT_SYMBOL(qcom_smd_driver_unregister);
|
||
|
|
||
|
/*
|
||
|
* Allocate the qcom_smd_channel object for a newly found smd channel,
|
||
|
* retrieving and validating the smem items involved.
|
||
|
*/
|
||
|
static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *edge,
|
||
|
unsigned smem_info_item,
|
||
|
unsigned smem_fifo_item,
|
||
|
char *name)
|
||
|
{
|
||
|
struct qcom_smd_channel *channel;
|
||
|
struct qcom_smd *smd = edge->smd;
|
||
|
size_t fifo_size;
|
||
|
size_t info_size;
|
||
|
void *fifo_base;
|
||
|
void *info;
|
||
|
int ret;
|
||
|
|
||
|
channel = devm_kzalloc(smd->dev, sizeof(*channel), GFP_KERNEL);
|
||
|
if (!channel)
|
||
|
return ERR_PTR(-ENOMEM);
|
||
|
|
||
|
channel->edge = edge;
|
||
|
channel->name = devm_kstrdup(smd->dev, name, GFP_KERNEL);
|
||
|
if (!channel->name)
|
||
|
return ERR_PTR(-ENOMEM);
|
||
|
|
||
|
mutex_init(&channel->tx_lock);
|
||
|
spin_lock_init(&channel->recv_lock);
|
||
|
init_waitqueue_head(&channel->fblockread_event);
|
||
|
|
||
|
ret = qcom_smem_get(edge->edge_id, smem_info_item, (void **)&info, &info_size);
|
||
|
if (ret)
|
||
|
goto free_name_and_channel;
|
||
|
|
||
|
/*
|
||
|
* Use the size of the item to figure out which channel info struct to
|
||
|
* use.
|
||
|
*/
|
||
|
if (info_size == 2 * sizeof(struct smd_channel_info_word)) {
|
||
|
channel->tx_info_word = info;
|
||
|
channel->rx_info_word = info + sizeof(struct smd_channel_info_word);
|
||
|
} else if (info_size == 2 * sizeof(struct smd_channel_info)) {
|
||
|
channel->tx_info = info;
|
||
|
channel->rx_info = info + sizeof(struct smd_channel_info);
|
||
|
} else {
|
||
|
dev_err(smd->dev,
|
||
|
"channel info of size %zu not supported\n", info_size);
|
||
|
ret = -EINVAL;
|
||
|
goto free_name_and_channel;
|
||
|
}
|
||
|
|
||
|
ret = qcom_smem_get(edge->edge_id, smem_fifo_item, &fifo_base, &fifo_size);
|
||
|
if (ret)
|
||
|
goto free_name_and_channel;
|
||
|
|
||
|
/* The channel consist of a rx and tx fifo of equal size */
|
||
|
fifo_size /= 2;
|
||
|
|
||
|
dev_dbg(smd->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n",
|
||
|
name, info_size, fifo_size);
|
||
|
|
||
|
channel->tx_fifo = fifo_base;
|
||
|
channel->rx_fifo = fifo_base + fifo_size;
|
||
|
channel->fifo_size = fifo_size;
|
||
|
|
||
|
qcom_smd_channel_reset(channel);
|
||
|
|
||
|
return channel;
|
||
|
|
||
|
free_name_and_channel:
|
||
|
devm_kfree(smd->dev, channel->name);
|
||
|
devm_kfree(smd->dev, channel);
|
||
|
|
||
|
return ERR_PTR(ret);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Scans the allocation table for any newly allocated channels, calls
|
||
|
* qcom_smd_create_channel() to create representations of these and add
|
||
|
* them to the edge's list of channels.
|
||
|
*/
|
||
|
static void qcom_discover_channels(struct qcom_smd_edge *edge)
|
||
|
{
|
||
|
struct qcom_smd_alloc_entry *alloc_tbl;
|
||
|
struct qcom_smd_alloc_entry *entry;
|
||
|
struct qcom_smd_channel *channel;
|
||
|
struct qcom_smd *smd = edge->smd;
|
||
|
unsigned long flags;
|
||
|
unsigned fifo_id;
|
||
|
unsigned info_id;
|
||
|
int ret;
|
||
|
int tbl;
|
||
|
int i;
|
||
|
|
||
|
for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) {
|
||
|
ret = qcom_smem_get(edge->edge_id,
|
||
|
smem_items[tbl].alloc_tbl_id,
|
||
|
(void **)&alloc_tbl,
|
||
|
NULL);
|
||
|
if (ret < 0)
|
||
|
continue;
|
||
|
|
||
|
for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) {
|
||
|
entry = &alloc_tbl[i];
|
||
|
if (test_bit(i, edge->allocated[tbl]))
|
||
|
continue;
|
||
|
|
||
|
if (entry->ref_count == 0)
|
||
|
continue;
|
||
|
|
||
|
if (!entry->name[0])
|
||
|
continue;
|
||
|
|
||
|
if (!(entry->flags & SMD_CHANNEL_FLAGS_PACKET))
|
||
|
continue;
|
||
|
|
||
|
if ((entry->flags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id)
|
||
|
continue;
|
||
|
|
||
|
info_id = smem_items[tbl].info_base_id + entry->cid;
|
||
|
fifo_id = smem_items[tbl].fifo_base_id + entry->cid;
|
||
|
|
||
|
channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name);
|
||
|
if (IS_ERR(channel))
|
||
|
continue;
|
||
|
|
||
|
spin_lock_irqsave(&edge->channels_lock, flags);
|
||
|
list_add(&channel->list, &edge->channels);
|
||
|
spin_unlock_irqrestore(&edge->channels_lock, flags);
|
||
|
|
||
|
dev_dbg(smd->dev, "new channel found: '%s'\n", channel->name);
|
||
|
set_bit(i, edge->allocated[tbl]);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
schedule_work(&edge->work);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* This per edge worker scans smem for any new channels and register these. It
|
||
|
* then scans all registered channels for state changes that should be handled
|
||
|
* by creating or destroying smd client devices for the registered channels.
|
||
|
*
|
||
|
* LOCKING: edge->channels_lock is not needed to be held during the traversal
|
||
|
* of the channels list as it's done synchronously with the only writer.
|
||
|
*/
|
||
|
static void qcom_channel_state_worker(struct work_struct *work)
|
||
|
{
|
||
|
struct qcom_smd_channel *channel;
|
||
|
struct qcom_smd_edge *edge = container_of(work,
|
||
|
struct qcom_smd_edge,
|
||
|
work);
|
||
|
unsigned remote_state;
|
||
|
|
||
|
/*
|
||
|
* Rescan smem if we have reason to belive that there are new channels.
|
||
|
*/
|
||
|
if (edge->need_rescan) {
|
||
|
edge->need_rescan = false;
|
||
|
qcom_discover_channels(edge);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Register a device for any closed channel where the remote processor
|
||
|
* is showing interest in opening the channel.
|
||
|
*/
|
||
|
list_for_each_entry(channel, &edge->channels, list) {
|
||
|
if (channel->state != SMD_CHANNEL_CLOSED)
|
||
|
continue;
|
||
|
|
||
|
remote_state = GET_RX_CHANNEL_INFO(channel, state);
|
||
|
if (remote_state != SMD_CHANNEL_OPENING &&
|
||
|
remote_state != SMD_CHANNEL_OPENED)
|
||
|
continue;
|
||
|
|
||
|
qcom_smd_create_device(channel);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Unregister the device for any channel that is opened where the
|
||
|
* remote processor is closing the channel.
|
||
|
*/
|
||
|
list_for_each_entry(channel, &edge->channels, list) {
|
||
|
if (channel->state != SMD_CHANNEL_OPENING &&
|
||
|
channel->state != SMD_CHANNEL_OPENED)
|
||
|
continue;
|
||
|
|
||
|
remote_state = GET_RX_CHANNEL_INFO(channel, state);
|
||
|
if (remote_state == SMD_CHANNEL_OPENING ||
|
||
|
remote_state == SMD_CHANNEL_OPENED)
|
||
|
continue;
|
||
|
|
||
|
qcom_smd_destroy_device(channel);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Parses an of_node describing an edge.
|
||
|
*/
|
||
|
static int qcom_smd_parse_edge(struct device *dev,
|
||
|
struct device_node *node,
|
||
|
struct qcom_smd_edge *edge)
|
||
|
{
|
||
|
struct device_node *syscon_np;
|
||
|
const char *key;
|
||
|
int irq;
|
||
|
int ret;
|
||
|
|
||
|
INIT_LIST_HEAD(&edge->channels);
|
||
|
spin_lock_init(&edge->channels_lock);
|
||
|
|
||
|
INIT_WORK(&edge->work, qcom_channel_state_worker);
|
||
|
|
||
|
edge->of_node = of_node_get(node);
|
||
|
|
||
|
irq = irq_of_parse_and_map(node, 0);
|
||
|
if (irq < 0) {
|
||
|
dev_err(dev, "required smd interrupt missing\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ret = devm_request_irq(dev, irq,
|
||
|
qcom_smd_edge_intr, IRQF_TRIGGER_RISING,
|
||
|
node->name, edge);
|
||
|
if (ret) {
|
||
|
dev_err(dev, "failed to request smd irq\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
edge->irq = irq;
|
||
|
|
||
|
key = "qcom,smd-edge";
|
||
|
ret = of_property_read_u32(node, key, &edge->edge_id);
|
||
|
if (ret) {
|
||
|
dev_err(dev, "edge missing %s property\n", key);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
syscon_np = of_parse_phandle(node, "qcom,ipc", 0);
|
||
|
if (!syscon_np) {
|
||
|
dev_err(dev, "no qcom,ipc node\n");
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
|
||
|
edge->ipc_regmap = syscon_node_to_regmap(syscon_np);
|
||
|
if (IS_ERR(edge->ipc_regmap))
|
||
|
return PTR_ERR(edge->ipc_regmap);
|
||
|
|
||
|
key = "qcom,ipc";
|
||
|
ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "no offset in %s\n", key);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "no bit in %s\n", key);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int qcom_smd_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct qcom_smd_edge *edge;
|
||
|
struct device_node *node;
|
||
|
struct qcom_smd *smd;
|
||
|
size_t array_size;
|
||
|
int num_edges;
|
||
|
int ret;
|
||
|
int i = 0;
|
||
|
|
||
|
/* Wait for smem */
|
||
|
ret = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL, NULL);
|
||
|
if (ret == -EPROBE_DEFER)
|
||
|
return ret;
|
||
|
|
||
|
num_edges = of_get_available_child_count(pdev->dev.of_node);
|
||
|
array_size = sizeof(*smd) + num_edges * sizeof(struct qcom_smd_edge);
|
||
|
smd = devm_kzalloc(&pdev->dev, array_size, GFP_KERNEL);
|
||
|
if (!smd)
|
||
|
return -ENOMEM;
|
||
|
smd->dev = &pdev->dev;
|
||
|
|
||
|
smd->num_edges = num_edges;
|
||
|
for_each_available_child_of_node(pdev->dev.of_node, node) {
|
||
|
edge = &smd->edges[i++];
|
||
|
edge->smd = smd;
|
||
|
|
||
|
ret = qcom_smd_parse_edge(&pdev->dev, node, edge);
|
||
|
if (ret)
|
||
|
continue;
|
||
|
|
||
|
edge->need_rescan = true;
|
||
|
schedule_work(&edge->work);
|
||
|
}
|
||
|
|
||
|
platform_set_drvdata(pdev, smd);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Shut down all smd clients by making sure that each edge stops processing
|
||
|
* events and scanning for new channels, then call destroy on the devices.
|
||
|
*/
|
||
|
static int qcom_smd_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct qcom_smd_channel *channel;
|
||
|
struct qcom_smd_edge *edge;
|
||
|
struct qcom_smd *smd = platform_get_drvdata(pdev);
|
||
|
int i;
|
||
|
|
||
|
for (i = 0; i < smd->num_edges; i++) {
|
||
|
edge = &smd->edges[i];
|
||
|
|
||
|
disable_irq(edge->irq);
|
||
|
cancel_work_sync(&edge->work);
|
||
|
|
||
|
list_for_each_entry(channel, &edge->channels, list) {
|
||
|
if (!channel->qsdev)
|
||
|
continue;
|
||
|
|
||
|
qcom_smd_destroy_device(channel);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const struct of_device_id qcom_smd_of_match[] = {
|
||
|
{ .compatible = "qcom,smd" },
|
||
|
{}
|
||
|
};
|
||
|
MODULE_DEVICE_TABLE(of, qcom_smd_of_match);
|
||
|
|
||
|
static struct platform_driver qcom_smd_driver = {
|
||
|
.probe = qcom_smd_probe,
|
||
|
.remove = qcom_smd_remove,
|
||
|
.driver = {
|
||
|
.name = "qcom-smd",
|
||
|
.of_match_table = qcom_smd_of_match,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static int __init qcom_smd_init(void)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
ret = bus_register(&qcom_smd_bus);
|
||
|
if (ret) {
|
||
|
pr_err("failed to register smd bus: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
return platform_driver_register(&qcom_smd_driver);
|
||
|
}
|
||
|
postcore_initcall(qcom_smd_init);
|
||
|
|
||
|
static void __exit qcom_smd_exit(void)
|
||
|
{
|
||
|
platform_driver_unregister(&qcom_smd_driver);
|
||
|
bus_unregister(&qcom_smd_bus);
|
||
|
}
|
||
|
module_exit(qcom_smd_exit);
|
||
|
|
||
|
MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
|
||
|
MODULE_DESCRIPTION("Qualcomm Shared Memory Driver");
|
||
|
MODULE_LICENSE("GPL v2");
|