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bus: mhi: core: Add support for data transfer

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Add support for transferring data between external modem and host
processor using MHI protocol.

This is based on the patch submitted by Sujeev Dias:
https://lkml.org/lkml/2018/7/9/988

Signed-off-by: Sujeev Dias <sdias@codeaurora.org>
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
[mani: splitted the data transfer patch and cleaned up for upstream]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
Link: https://lore.kernel.org/r/20200220095854.4804-12-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manivannan Sadhasivam
2020-02-20 15:28:49 +05:30
committed by Greg Kroah-Hartman
parent 1d3173a3ba
commit 189ff97cca
5 changed files with 979 additions and 8 deletions
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80
include/linux/mhi.h
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@@ -10,6 +10,7 @@
#include <linux/dma-direction.h>
#include <linux/mutex.h>
#include <linux/rwlock_types.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock_types.h>
#include <linux/wait.h>
@@ -336,6 +337,8 @@ struct mhi_controller_config {
* @wake_toggle: CB function to assert and de-assert device wake (optional)
* @runtime_get: CB function to controller runtime resume (required)
* @runtimet_put: CB function to decrement pm usage (required)
* @map_single: CB function to create TRE buffer
* @unmap_single: CB function to destroy TRE buffer
* @buffer_len: Bounce buffer length
* @bounce_buf: Use of bounce buffer
* @fbc_download: MHI host needs to do complete image transfer (optional)
@@ -403,6 +406,10 @@ struct mhi_controller {
void (*wake_toggle)(struct mhi_controller *mhi_cntrl);
int (*runtime_get)(struct mhi_controller *mhi_cntrl);
void (*runtime_put)(struct mhi_controller *mhi_cntrl);
int (*map_single)(struct mhi_controller *mhi_cntrl,
struct mhi_buf_info *buf);
void (*unmap_single)(struct mhi_controller *mhi_cntrl,
struct mhi_buf_info *buf);
size_t buffer_len;
bool bounce_buf;
@@ -583,4 +590,77 @@ int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl);
*/
enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl);
/**
* mhi_device_get - Disable device low power mode
* @mhi_dev: Device associated with the channel
*/
void mhi_device_get(struct mhi_device *mhi_dev);
/**
* mhi_device_get_sync - Disable device low power mode. Synchronously
* take the controller out of suspended state
* @mhi_dev: Device associated with the channel
*/
int mhi_device_get_sync(struct mhi_device *mhi_dev);
/**
* mhi_device_put - Re-enable device low power mode
* @mhi_dev: Device associated with the channel
*/
void mhi_device_put(struct mhi_device *mhi_dev);
/**
* mhi_prepare_for_transfer - Setup channel for data transfer
* @mhi_dev: Device associated with the channels
*/
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);
/**
* mhi_unprepare_from_transfer - Unprepare the channels
* @mhi_dev: Device associated with the channels
*/
void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev);
/**
* mhi_poll - Poll for any available data in DL direction
* @mhi_dev: Device associated with the channels
* @budget: # of events to process
*/
int mhi_poll(struct mhi_device *mhi_dev, u32 budget);
/**
* mhi_queue_dma - Send or receive DMA mapped buffers from client device
* over MHI channel
* @mhi_dev: Device associated with the channels
* @dir: DMA direction for the channel
* @mhi_buf: Buffer for holding the DMA mapped data
* @len: Buffer length
* @mflags: MHI transfer flags used for the transfer
*/
int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir,
struct mhi_buf *mhi_buf, size_t len, enum mhi_flags mflags);
/**
* mhi_queue_buf - Send or receive raw buffers from client device over MHI
* channel
* @mhi_dev: Device associated with the channels
* @dir: DMA direction for the channel
* @buf: Buffer for holding the data
* @len: Buffer length
* @mflags: MHI transfer flags used for the transfer
*/
int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir,
void *buf, size_t len, enum mhi_flags mflags);
/**
* mhi_queue_skb - Send or receive SKBs from client device over MHI channel
* @mhi_dev: Device associated with the channels
* @dir: DMA direction for the channel
* @skb: Buffer for holding SKBs
* @len: Buffer length
* @mflags: MHI transfer flags used for the transfer
*/
int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir,
struct sk_buff *skb, size_t len, enum mhi_flags mflags);
#endif /* _MHI_H_ */