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/*
* Qualcomm Technologies HIDMA data structures
*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 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.
*/
#ifndef QCOM_HIDMA_H
#define QCOM_HIDMA_H
#include <linux/kfifo.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#define TRE_SIZE 32 /* each TRE is 32 bytes */
#define TRE_CFG_IDX 0
#define TRE_LEN_IDX 1
#define TRE_SRC_LOW_IDX 2
#define TRE_SRC_HI_IDX 3
#define TRE_DEST_LOW_IDX 4
#define TRE_DEST_HI_IDX 5
struct hidma_tx_status {
u8 err_info; /* error record in this transfer */
u8 err_code; /* completion code */
};
struct hidma_tre {
atomic_t allocated; /* if this channel is allocated */
bool queued; /* flag whether this is pending */
u16 status; /* status */
u32 chidx; /* index of the tre */
u32 dma_sig; /* signature of the tre */
const char *dev_name; /* name of the device */
void (*callback)(void *data); /* requester callback */
void *data; /* Data associated with this channel*/
struct hidma_lldev *lldev; /* lldma device pointer */
u32 tre_local[TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy */
u32 tre_index; /* the offset where this was written*/
u32 int_flags; /* interrupt flags */
};
struct hidma_lldev {
bool initialized; /* initialized flag */
u8 trch_state; /* trch_state of the device */
u8 evch_state; /* evch_state of the device */
u8 chidx; /* channel index in the core */
u32 nr_tres; /* max number of configs */
spinlock_t lock; /* reentrancy */
struct hidma_tre *trepool; /* trepool of user configs */
struct device *dev; /* device */
void __iomem *trca; /* Transfer Channel address */
void __iomem *evca; /* Event Channel address */
struct hidma_tre
**pending_tre_list; /* Pointers to pending TREs */
struct hidma_tx_status
*tx_status_list; /* Pointers to pending TREs status*/
s32 pending_tre_count; /* Number of TREs pending */
void *tre_ring; /* TRE ring */
dma_addr_t tre_ring_handle; /* TRE ring to be shared with HW */
u32 tre_ring_size; /* Byte size of the ring */
u32 tre_processed_off; /* last processed TRE */
void *evre_ring; /* EVRE ring */
dma_addr_t evre_ring_handle; /* EVRE ring to be shared with HW */
u32 evre_ring_size; /* Byte size of the ring */
u32 evre_processed_off; /* last processed EVRE */
u32 tre_write_offset; /* TRE write location */
struct tasklet_struct task; /* task delivering notifications */
DECLARE_KFIFO_PTR(handoff_fifo,
struct hidma_tre *); /* pending TREs FIFO */
};
struct hidma_desc {
struct dma_async_tx_descriptor desc;
/* link list node for this channel*/
struct list_head node;
u32 tre_ch;
};
struct hidma_chan {
bool paused;
bool allocated;
char dbg_name[16];
u32 dma_sig;
/*
* active descriptor on this channel
* It is used by the DMA complete notification to
* locate the descriptor that initiated the transfer.
*/
struct dentry *debugfs;
struct dentry *stats;
struct hidma_dev *dmadev;
struct hidma_desc *running;
struct dma_chan chan;
struct list_head free;
struct list_head prepared;
struct list_head active;
struct list_head completed;
/* Lock for this structure */
spinlock_t lock;
};
struct hidma_dev {
int irq;
int chidx;
u32 nr_descriptors;
struct hidma_lldev *lldev;
void __iomem *dev_trca;
struct resource *trca_resource;
void __iomem *dev_evca;
struct resource *evca_resource;
/* used to protect the pending channel list*/
spinlock_t lock;
struct dma_device ddev;
struct dentry *debugfs;
struct dentry *stats;
/* Task delivering issue_pending */
struct tasklet_struct task;
};
int hidma_ll_request(struct hidma_lldev *llhndl, u32 dev_id,
const char *dev_name,
void (*callback)(void *data), void *data, u32 *tre_ch);
void hidma_ll_free(struct hidma_lldev *llhndl, u32 tre_ch);
enum dma_status hidma_ll_status(struct hidma_lldev *llhndl, u32 tre_ch);
bool hidma_ll_isenabled(struct hidma_lldev *llhndl);
void hidma_ll_queue_request(struct hidma_lldev *llhndl, u32 tre_ch);
void hidma_ll_start(struct hidma_lldev *llhndl);
int hidma_ll_pause(struct hidma_lldev *llhndl);
int hidma_ll_resume(struct hidma_lldev *llhndl);
void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch,
dma_addr_t src, dma_addr_t dest, u32 len, u32 flags);
int hidma_ll_setup(struct hidma_lldev *lldev);
struct hidma_lldev *hidma_ll_init(struct device *dev, u32 max_channels,
void __iomem *trca, void __iomem *evca,
u8 chidx);
int hidma_ll_uninit(struct hidma_lldev *llhndl);
irqreturn_t hidma_ll_inthandler(int irq, void *arg);
void hidma_cleanup_pending_tre(struct hidma_lldev *llhndl, u8 err_info,
u8 err_code);
#endif
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