xref: /openbmc/linux/drivers/usb/renesas_usbhs/fifo.h (revision ea0efd68)
1 /* SPDX-License-Identifier: GPL-1.0+ */
2 /*
3  * Renesas USB driver
4  *
5  * Copyright (C) 2011 Renesas Solutions Corp.
6  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7  */
8 #ifndef RENESAS_USB_FIFO_H
9 #define RENESAS_USB_FIFO_H
10 
11 #include <linux/interrupt.h>
12 #include <linux/sh_dma.h>
13 #include <linux/workqueue.h>
14 #include <asm/dma.h>
15 #include "pipe.h"
16 
17 struct usbhs_fifo {
18 	char *name;
19 	u32 port;	/* xFIFO */
20 	u32 sel;	/* xFIFOSEL */
21 	u32 ctr;	/* xFIFOCTR */
22 
23 	struct usbhs_pipe	*pipe;
24 
25 	struct dma_chan		*tx_chan;
26 	struct dma_chan		*rx_chan;
27 
28 	struct sh_dmae_slave	tx_slave;
29 	struct sh_dmae_slave	rx_slave;
30 };
31 
32 #define USBHS_MAX_NUM_DFIFO	4
33 struct usbhs_fifo_info {
34 	struct usbhs_fifo cfifo;
35 	struct usbhs_fifo dfifo[USBHS_MAX_NUM_DFIFO];
36 };
37 #define usbhsf_get_dnfifo(p, n)	(&((p)->fifo_info.dfifo[n]))
38 #define usbhs_for_each_dfifo(priv, dfifo, i)			\
39 	for ((i) = 0;						\
40 	     ((i) < USBHS_MAX_NUM_DFIFO) &&			\
41 		     ((dfifo) = usbhsf_get_dnfifo(priv, (i)));	\
42 	     (i)++)
43 
44 struct usbhs_pkt_handle;
45 struct usbhs_pkt {
46 	struct list_head node;
47 	struct usbhs_pipe *pipe;
48 	const struct usbhs_pkt_handle *handler;
49 	void (*done)(struct usbhs_priv *priv,
50 		     struct usbhs_pkt *pkt);
51 	struct work_struct work;
52 	dma_addr_t dma;
53 	const struct dmaengine_result *dma_result;
54 	void *buf;
55 	int length;
56 	int trans;
57 	int actual;
58 	int zero;
59 	int sequence;
60 };
61 
62 struct usbhs_pkt_handle {
63 	int (*prepare)(struct usbhs_pkt *pkt, int *is_done);
64 	int (*try_run)(struct usbhs_pkt *pkt, int *is_done);
65 	int (*dma_done)(struct usbhs_pkt *pkt, int *is_done);
66 };
67 
68 /*
69  * fifo
70  */
71 int usbhs_fifo_probe(struct usbhs_priv *priv);
72 void usbhs_fifo_remove(struct usbhs_priv *priv);
73 void usbhs_fifo_init(struct usbhs_priv *priv);
74 void usbhs_fifo_quit(struct usbhs_priv *priv);
75 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe);
76 
77 /*
78  * packet info
79  */
80 extern const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler;
81 extern const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler;
82 extern const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler;
83 
84 extern const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler;
85 extern const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler;
86 
87 extern const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler;
88 extern const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler;
89 
90 extern const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler;
91 extern const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler;
92 
93 void usbhs_pkt_init(struct usbhs_pkt *pkt);
94 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
95 		    void (*done)(struct usbhs_priv *priv,
96 				 struct usbhs_pkt *pkt),
97 		    void *buf, int len, int zero, int sequence);
98 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt);
99 void usbhs_pkt_start(struct usbhs_pipe *pipe);
100 struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe);
101 
102 #endif /* RENESAS_USB_FIFO_H */
103