xref: /linux/drivers/net/can/softing/softing.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * softing common interfaces
4  *
5  * by Kurt Van Dijck, 2008-2010
6  */
7 
8 #include <linux/atomic.h>
9 #include <linux/netdevice.h>
10 #include <linux/ktime.h>
11 #include <linux/mutex.h>
12 #include <linux/spinlock.h>
13 #include <linux/can.h>
14 #include <linux/can/dev.h>
15 
16 #include "softing_platform.h"
17 
18 struct softing;
19 
20 struct softing_priv {
21 	struct can_priv can; /* must be the first member! */
22 	struct net_device *netdev;
23 	struct softing *card;
24 	struct {
25 		int pending;
26 		/* variables which hold the circular buffer */
27 		int echo_put;
28 		int echo_get;
29 	} tx;
30 	struct can_bittiming_const btr_const;
31 	int index;
32 	uint8_t output;
33 	uint16_t chip;
34 };
35 #define netdev2softing(netdev)	((struct softing_priv *)netdev_priv(netdev))
36 
37 struct softing {
38 	const struct softing_platform_data *pdat;
39 	struct platform_device *pdev;
40 	struct net_device *net[2];
41 	spinlock_t spin; /* protect this structure & DPRAM access */
42 	ktime_t ts_ref;
43 	ktime_t ts_overflow; /* timestamp overflow value, in ktime */
44 
45 	struct {
46 		/* indication of firmware status */
47 		int up;
48 		/* protection of the 'up' variable */
49 		struct mutex lock;
50 	} fw;
51 	struct {
52 		int nr;
53 		int requested;
54 		int svc_count;
55 		unsigned int dpram_position;
56 	} irq;
57 	struct {
58 		int pending;
59 		int last_bus;
60 		/*
61 		 * keep the bus that last tx'd a message,
62 		 * in order to let every netdev queue resume
63 		 */
64 	} tx;
65 	__iomem uint8_t *dpram;
66 	unsigned long dpram_phys;
67 	unsigned long dpram_size;
68 	struct {
69 		uint16_t fw_version, hw_version, license, serial;
70 		uint16_t chip[2];
71 		unsigned int freq; /* remote cpu's operating frequency */
72 	} id;
73 };
74 
75 int softing_default_output(struct net_device *netdev);
76 
77 ktime_t softing_raw2ktime(struct softing *card, u32 raw);
78 
79 int softing_chip_poweron(struct softing *card);
80 
81 int softing_bootloader_command(struct softing *card, int16_t cmd,
82 			       const char *msg);
83 
84 /* Load firmware after reset */
85 int softing_load_fw(const char *file, struct softing *card,
86 		    __iomem uint8_t *virt, unsigned int size, int offset);
87 
88 /* Load final application firmware after bootloader */
89 int softing_load_app_fw(const char *file, struct softing *card);
90 
91 /*
92  * enable or disable irq
93  * only called with fw.lock locked
94  */
95 int softing_enable_irq(struct softing *card, int enable);
96 
97 /* start/stop 1 bus on card */
98 int softing_startstop(struct net_device *netdev, int up);
99 
100 /* netif_rx() */
101 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
102 		      ktime_t ktime);
103 
104 /* SOFTING DPRAM mappings */
105 #define DPRAM_RX		0x0000
106 	#define DPRAM_RX_SIZE	32
107 	#define DPRAM_RX_CNT	16
108 #define DPRAM_RX_RD		0x0201	/* uint8_t */
109 #define DPRAM_RX_WR		0x0205	/* uint8_t */
110 #define DPRAM_RX_LOST		0x0207	/* uint8_t */
111 
112 #define DPRAM_FCT_PARAM		0x0300	/* int16_t [20] */
113 #define DPRAM_FCT_RESULT	0x0328	/* int16_t */
114 #define DPRAM_FCT_HOST		0x032b	/* uint16_t */
115 
116 #define DPRAM_INFO_BUSSTATE	0x0331	/* uint16_t */
117 #define DPRAM_INFO_BUSSTATE2	0x0335	/* uint16_t */
118 #define DPRAM_INFO_ERRSTATE	0x0339	/* uint16_t */
119 #define DPRAM_INFO_ERRSTATE2	0x033d	/* uint16_t */
120 #define DPRAM_RESET		0x0341	/* uint16_t */
121 #define DPRAM_CLR_RECV_FIFO	0x0345	/* uint16_t */
122 #define DPRAM_RESET_TIME	0x034d	/* uint16_t */
123 #define DPRAM_TIME		0x0350	/* uint64_t */
124 #define DPRAM_WR_START		0x0358	/* uint8_t */
125 #define DPRAM_WR_END		0x0359	/* uint8_t */
126 #define DPRAM_RESET_RX_FIFO	0x0361	/* uint16_t */
127 #define DPRAM_RESET_TX_FIFO	0x0364	/* uint8_t */
128 #define DPRAM_READ_FIFO_LEVEL	0x0365	/* uint8_t */
129 #define DPRAM_RX_FIFO_LEVEL	0x0366	/* uint16_t */
130 #define DPRAM_TX_FIFO_LEVEL	0x0366	/* uint16_t */
131 
132 #define DPRAM_TX		0x0400	/* uint16_t */
133 	#define DPRAM_TX_SIZE	16
134 	#define DPRAM_TX_CNT	32
135 #define DPRAM_TX_RD		0x0601	/* uint8_t */
136 #define DPRAM_TX_WR		0x0605	/* uint8_t */
137 
138 #define DPRAM_COMMAND		0x07e0	/* uint16_t */
139 #define DPRAM_RECEIPT		0x07f0	/* uint16_t */
140 #define DPRAM_IRQ_TOHOST	0x07fe	/* uint8_t */
141 #define DPRAM_IRQ_TOCARD	0x07ff	/* uint8_t */
142 
143 #define DPRAM_V2_RESET		0x0e00	/* uint8_t */
144 #define DPRAM_V2_IRQ_TOHOST	0x0e02	/* uint8_t */
145 
146 #define TXMAX	(DPRAM_TX_CNT - 1)
147 
148 /* DPRAM return codes */
149 #define RES_NONE	0
150 #define RES_OK		1
151 #define RES_NOK		2
152 #define RES_UNKNOWN	3
153 /* DPRAM flags */
154 #define CMD_TX		0x01
155 #define CMD_ACK		0x02
156 #define CMD_XTD		0x04
157 #define CMD_RTR		0x08
158 #define CMD_ERR		0x10
159 #define CMD_BUS2	0x80
160 
161 /* returned fifo entry bus state masks */
162 #define SF_MASK_BUSOFF		0x80
163 #define SF_MASK_EPASSIVE	0x60
164 
165 /* bus states */
166 #define STATE_BUSOFF	2
167 #define STATE_EPASSIVE	1
168 #define STATE_EACTIVE	0
169