Merge branch 'for-4.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[sfrench/cifs-2.6.git] / drivers / dma / qcom / hidma.h
1 /*
2  * Qualcomm Technologies HIDMA data structures
3  *
4  * Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 and
8  * only version 2 as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  */
15
16 #ifndef QCOM_HIDMA_H
17 #define QCOM_HIDMA_H
18
19 #include <linux/kfifo.h>
20 #include <linux/interrupt.h>
21 #include <linux/dmaengine.h>
22
23 #define HIDMA_TRE_SIZE                  32 /* each TRE is 32 bytes  */
24 #define HIDMA_TRE_CFG_IDX               0
25 #define HIDMA_TRE_LEN_IDX               1
26 #define HIDMA_TRE_SRC_LOW_IDX           2
27 #define HIDMA_TRE_SRC_HI_IDX            3
28 #define HIDMA_TRE_DEST_LOW_IDX          4
29 #define HIDMA_TRE_DEST_HI_IDX           5
30
31 struct hidma_tre {
32         atomic_t allocated;             /* if this channel is allocated     */
33         bool queued;                    /* flag whether this is pending     */
34         u16 status;                     /* status                           */
35         u32 idx;                        /* index of the tre                 */
36         u32 dma_sig;                    /* signature of the tre             */
37         const char *dev_name;           /* name of the device               */
38         void (*callback)(void *data);   /* requester callback               */
39         void *data;                     /* Data associated with this channel*/
40         struct hidma_lldev *lldev;      /* lldma device pointer             */
41         u32 tre_local[HIDMA_TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy  */
42         u32 tre_index;                  /* the offset where this was written*/
43         u32 int_flags;                  /* interrupt flags                  */
44         u8 err_info;                    /* error record in this transfer    */
45         u8 err_code;                    /* completion code                  */
46 };
47
48 struct hidma_lldev {
49         bool msi_support;               /* flag indicating MSI support    */
50         bool initialized;               /* initialized flag               */
51         u8 trch_state;                  /* trch_state of the device       */
52         u8 evch_state;                  /* evch_state of the device       */
53         u8 chidx;                       /* channel index in the core      */
54         u32 nr_tres;                    /* max number of configs          */
55         spinlock_t lock;                /* reentrancy                     */
56         struct hidma_tre *trepool;      /* trepool of user configs */
57         struct device *dev;             /* device                         */
58         void __iomem *trca;             /* Transfer Channel address       */
59         void __iomem *evca;             /* Event Channel address          */
60         struct hidma_tre
61                 **pending_tre_list;     /* Pointers to pending TREs       */
62         atomic_t pending_tre_count;     /* Number of TREs pending         */
63
64         void *tre_ring;                 /* TRE ring                       */
65         dma_addr_t tre_dma;             /* TRE ring to be shared with HW  */
66         u32 tre_ring_size;              /* Byte size of the ring          */
67         u32 tre_processed_off;          /* last processed TRE             */
68
69         void *evre_ring;                /* EVRE ring                       */
70         dma_addr_t evre_dma;            /* EVRE ring to be shared with HW  */
71         u32 evre_ring_size;             /* Byte size of the ring           */
72         u32 evre_processed_off;         /* last processed EVRE             */
73
74         u32 tre_write_offset;           /* TRE write location              */
75         struct tasklet_struct task;     /* task delivering notifications   */
76         DECLARE_KFIFO_PTR(handoff_fifo,
77                 struct hidma_tre *);    /* pending TREs FIFO               */
78 };
79
80 struct hidma_desc {
81         struct dma_async_tx_descriptor  desc;
82         /* link list node for this channel*/
83         struct list_head                node;
84         u32                             tre_ch;
85 };
86
87 struct hidma_chan {
88         bool                            paused;
89         bool                            allocated;
90         char                            dbg_name[16];
91         u32                             dma_sig;
92         dma_cookie_t                    last_success;
93
94         /*
95          * active descriptor on this channel
96          * It is used by the DMA complete notification to
97          * locate the descriptor that initiated the transfer.
98          */
99         struct dentry                   *debugfs;
100         struct dentry                   *stats;
101         struct hidma_dev                *dmadev;
102         struct hidma_desc               *running;
103
104         struct dma_chan                 chan;
105         struct list_head                free;
106         struct list_head                prepared;
107         struct list_head                queued;
108         struct list_head                active;
109         struct list_head                completed;
110
111         /* Lock for this structure */
112         spinlock_t                      lock;
113 };
114
115 struct hidma_dev {
116         int                             irq;
117         int                             chidx;
118         u32                             nr_descriptors;
119         int                             msi_virqbase;
120
121         struct hidma_lldev              *lldev;
122         void                            __iomem *dev_trca;
123         struct resource                 *trca_resource;
124         void                            __iomem *dev_evca;
125         struct resource                 *evca_resource;
126
127         /* used to protect the pending channel list*/
128         spinlock_t                      lock;
129         struct dma_device               ddev;
130
131         struct dentry                   *debugfs;
132         struct dentry                   *stats;
133
134         /* sysfs entry for the channel id */
135         struct device_attribute         *chid_attrs;
136
137         /* Task delivering issue_pending */
138         struct tasklet_struct           task;
139 };
140
141 int hidma_ll_request(struct hidma_lldev *llhndl, u32 dev_id,
142                         const char *dev_name,
143                         void (*callback)(void *data), void *data, u32 *tre_ch);
144
145 void hidma_ll_free(struct hidma_lldev *llhndl, u32 tre_ch);
146 enum dma_status hidma_ll_status(struct hidma_lldev *llhndl, u32 tre_ch);
147 bool hidma_ll_isenabled(struct hidma_lldev *llhndl);
148 void hidma_ll_queue_request(struct hidma_lldev *llhndl, u32 tre_ch);
149 void hidma_ll_start(struct hidma_lldev *llhndl);
150 int hidma_ll_disable(struct hidma_lldev *lldev);
151 int hidma_ll_enable(struct hidma_lldev *llhndl);
152 void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch,
153         dma_addr_t src, dma_addr_t dest, u32 len, u32 flags);
154 void hidma_ll_setup_irq(struct hidma_lldev *lldev, bool msi);
155 int hidma_ll_setup(struct hidma_lldev *lldev);
156 struct hidma_lldev *hidma_ll_init(struct device *dev, u32 max_channels,
157                         void __iomem *trca, void __iomem *evca,
158                         u8 chidx);
159 int hidma_ll_uninit(struct hidma_lldev *llhndl);
160 irqreturn_t hidma_ll_inthandler(int irq, void *arg);
161 irqreturn_t hidma_ll_inthandler_msi(int irq, void *arg, int cause);
162 void hidma_cleanup_pending_tre(struct hidma_lldev *llhndl, u8 err_info,
163                                 u8 err_code);
164 int hidma_debug_init(struct hidma_dev *dmadev);
165 void hidma_debug_uninit(struct hidma_dev *dmadev);
166 #endif