1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Texas Instruments CPDMA Driver
4  *
5  * Copyright (C) 2010 Texas Instruments
6  *
7  */
8 #ifndef __DAVINCI_CPDMA_H__
9 #define __DAVINCI_CPDMA_H__
10 
11 #define CPDMA_MAX_CHANNELS	BITS_PER_LONG
12 
13 #define CPDMA_RX_SOURCE_PORT(__status__)	((__status__ >> 16) & 0x7)
14 
15 #define CPDMA_RX_VLAN_ENCAP BIT(19)
16 
17 #define CPDMA_EOI_RX_THRESH	0x0
18 #define CPDMA_EOI_RX		0x1
19 #define CPDMA_EOI_TX		0x2
20 #define CPDMA_EOI_MISC		0x3
21 
22 struct cpdma_params {
23 	struct device		*dev;
24 	void __iomem		*dmaregs;
25 	void __iomem		*txhdp, *rxhdp, *txcp, *rxcp;
26 	void __iomem		*rxthresh, *rxfree;
27 	int			num_chan;
28 	bool			has_soft_reset;
29 	int			min_packet_size;
30 	dma_addr_t		desc_mem_phys;
31 	dma_addr_t		desc_hw_addr;
32 	int			desc_mem_size;
33 	int			desc_align;
34 	u32			bus_freq_mhz;
35 	u32			descs_pool_size;
36 
37 	/*
38 	 * Some instances of embedded cpdma controllers have extra control and
39 	 * status registers.  The following flag enables access to these
40 	 * "extended" registers.
41 	 */
42 	bool			has_ext_regs;
43 };
44 
45 struct cpdma_chan_stats {
46 	u32			head_enqueue;
47 	u32			tail_enqueue;
48 	u32			pad_enqueue;
49 	u32			misqueued;
50 	u32			desc_alloc_fail;
51 	u32			pad_alloc_fail;
52 	u32			runt_receive_buff;
53 	u32			runt_transmit_buff;
54 	u32			empty_dequeue;
55 	u32			busy_dequeue;
56 	u32			good_dequeue;
57 	u32			requeue;
58 	u32			teardown_dequeue;
59 };
60 
61 struct cpdma_ctlr;
62 struct cpdma_chan;
63 
64 typedef void (*cpdma_handler_fn)(void *token, int len, int status);
65 
66 struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params);
67 int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr);
68 int cpdma_ctlr_start(struct cpdma_ctlr *ctlr);
69 int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr);
70 
71 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
72 				     cpdma_handler_fn handler, int rx_type);
73 int cpdma_chan_get_rx_buf_num(struct cpdma_chan *chan);
74 int cpdma_chan_destroy(struct cpdma_chan *chan);
75 int cpdma_chan_start(struct cpdma_chan *chan);
76 int cpdma_chan_stop(struct cpdma_chan *chan);
77 
78 int cpdma_chan_get_stats(struct cpdma_chan *chan,
79 			 struct cpdma_chan_stats *stats);
80 int cpdma_chan_submit_mapped(struct cpdma_chan *chan, void *token,
81 			     dma_addr_t data, int len, int directed);
82 int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
83 		      int len, int directed);
84 int cpdma_chan_idle_submit_mapped(struct cpdma_chan *chan, void *token,
85 				  dma_addr_t data, int len, int directed);
86 int cpdma_chan_idle_submit(struct cpdma_chan *chan, void *token, void *data,
87 			   int len, int directed);
88 int cpdma_chan_process(struct cpdma_chan *chan, int quota);
89 
90 int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable);
91 void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value);
92 int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable);
93 u32 cpdma_ctrl_rxchs_state(struct cpdma_ctlr *ctlr);
94 u32 cpdma_ctrl_txchs_state(struct cpdma_ctlr *ctlr);
95 bool cpdma_check_free_tx_desc(struct cpdma_chan *chan);
96 int cpdma_chan_set_weight(struct cpdma_chan *ch, int weight);
97 int cpdma_chan_set_rate(struct cpdma_chan *ch, u32 rate);
98 u32 cpdma_chan_get_rate(struct cpdma_chan *ch);
99 u32 cpdma_chan_get_min_rate(struct cpdma_ctlr *ctlr);
100 
101 enum cpdma_control {
102 	CPDMA_TX_RLIM,			/* read-write */
103 	CPDMA_CMD_IDLE,			/* write-only */
104 	CPDMA_COPY_ERROR_FRAMES,	/* read-write */
105 	CPDMA_RX_OFF_LEN_UPDATE,	/* read-write */
106 	CPDMA_RX_OWNERSHIP_FLIP,	/* read-write */
107 	CPDMA_TX_PRIO_FIXED,		/* read-write */
108 	CPDMA_STAT_IDLE,		/* read-only */
109 	CPDMA_STAT_TX_ERR_CHAN,		/* read-only */
110 	CPDMA_STAT_TX_ERR_CODE,		/* read-only */
111 	CPDMA_STAT_RX_ERR_CHAN,		/* read-only */
112 	CPDMA_STAT_RX_ERR_CODE,		/* read-only */
113 	CPDMA_RX_BUFFER_OFFSET,		/* read-write */
114 };
115 
116 int cpdma_control_get(struct cpdma_ctlr *ctlr, int control);
117 int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value);
118 int cpdma_get_num_rx_descs(struct cpdma_ctlr *ctlr);
119 int cpdma_set_num_rx_descs(struct cpdma_ctlr *ctlr, int num_rx_desc);
120 int cpdma_get_num_tx_descs(struct cpdma_ctlr *ctlr);
121 
122 #endif
123