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1 #ifndef _SPARC64_LDC_H
2 #define _SPARC64_LDC_H
3 
4 #include <asm/hypervisor.h>
5 
6 extern int ldom_domaining_enabled;
7 void ldom_set_var(const char *var, const char *value);
8 void ldom_reboot(const char *boot_command);
9 void ldom_power_off(void);
10 
11 /* The event handler will be evoked when link state changes
12  * or data becomes available on the receive side.
13  *
14  * For non-RAW links, if the LDC_EVENT_RESET event arrives the
15  * driver should reset all of it's internal state and reinvoke
16  * ldc_connect() to try and bring the link up again.
17  *
18  * For RAW links, ldc_connect() is not used.  Instead the driver
19  * just waits for the LDC_EVENT_UP event.
20  */
21 struct ldc_channel_config {
22 	void (*event)(void *arg, int event);
23 
24 	u32			mtu;
25 	unsigned int		rx_irq;
26 	unsigned int		tx_irq;
27 	u8			mode;
28 #define LDC_MODE_RAW		0x00
29 #define LDC_MODE_UNRELIABLE	0x01
30 #define LDC_MODE_RESERVED	0x02
31 #define LDC_MODE_STREAM		0x03
32 
33 	u8			debug;
34 #define LDC_DEBUG_HS		0x01
35 #define LDC_DEBUG_STATE		0x02
36 #define LDC_DEBUG_RX		0x04
37 #define LDC_DEBUG_TX		0x08
38 #define LDC_DEBUG_DATA		0x10
39 };
40 
41 #define LDC_EVENT_RESET		0x01
42 #define LDC_EVENT_UP		0x02
43 #define LDC_EVENT_DATA_READY	0x04
44 
45 #define LDC_STATE_INVALID	0x00
46 #define LDC_STATE_INIT		0x01
47 #define LDC_STATE_BOUND		0x02
48 #define LDC_STATE_READY		0x03
49 #define LDC_STATE_CONNECTED	0x04
50 
51 struct ldc_channel;
52 
53 /* Allocate state for a channel.  */
54 struct ldc_channel *ldc_alloc(unsigned long id,
55 			      const struct ldc_channel_config *cfgp,
56 			      void *event_arg,
57 			      const char *name);
58 
59 /* Shut down and free state for a channel.  */
60 void ldc_free(struct ldc_channel *lp);
61 
62 /* Register TX and RX queues of the link with the hypervisor.  */
63 int ldc_bind(struct ldc_channel *lp);
64 void ldc_unbind(struct ldc_channel *lp);
65 
66 /* For non-RAW protocols we need to complete a handshake before
67  * communication can proceed.  ldc_connect() does that, if the
68  * handshake completes successfully, an LDC_EVENT_UP event will
69  * be sent up to the driver.
70  */
71 int ldc_connect(struct ldc_channel *lp);
72 int ldc_disconnect(struct ldc_channel *lp);
73 
74 int ldc_state(struct ldc_channel *lp);
75 
76 /* Read and write operations.  Only valid when the link is up.  */
77 int ldc_write(struct ldc_channel *lp, const void *buf,
78 	      unsigned int size);
79 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size);
80 
81 #define LDC_MAP_SHADOW	0x01
82 #define LDC_MAP_DIRECT	0x02
83 #define LDC_MAP_IO	0x04
84 #define LDC_MAP_R	0x08
85 #define LDC_MAP_W	0x10
86 #define LDC_MAP_X	0x20
87 #define LDC_MAP_RW	(LDC_MAP_R | LDC_MAP_W)
88 #define LDC_MAP_RWX	(LDC_MAP_R | LDC_MAP_W | LDC_MAP_X)
89 #define LDC_MAP_ALL	0x03f
90 
91 struct ldc_trans_cookie {
92 	u64			cookie_addr;
93 	u64			cookie_size;
94 };
95 
96 struct scatterlist;
97 int ldc_map_sg(struct ldc_channel *lp,
98 	       struct scatterlist *sg, int num_sg,
99 	       struct ldc_trans_cookie *cookies, int ncookies,
100 	       unsigned int map_perm);
101 
102 int ldc_map_single(struct ldc_channel *lp,
103 		   void *buf, unsigned int len,
104 		   struct ldc_trans_cookie *cookies, int ncookies,
105 		   unsigned int map_perm);
106 
107 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
108 	       int ncookies);
109 
110 int ldc_copy(struct ldc_channel *lp, int copy_dir,
111 	     void *buf, unsigned int len, unsigned long offset,
112 	     struct ldc_trans_cookie *cookies, int ncookies);
113 
ldc_get_dring_entry(struct ldc_channel * lp,void * buf,unsigned int len,unsigned long offset,struct ldc_trans_cookie * cookies,int ncookies)114 static inline int ldc_get_dring_entry(struct ldc_channel *lp,
115 				      void *buf, unsigned int len,
116 				      unsigned long offset,
117 				      struct ldc_trans_cookie *cookies,
118 				      int ncookies)
119 {
120 	return ldc_copy(lp, LDC_COPY_IN, buf, len, offset, cookies, ncookies);
121 }
122 
ldc_put_dring_entry(struct ldc_channel * lp,void * buf,unsigned int len,unsigned long offset,struct ldc_trans_cookie * cookies,int ncookies)123 static inline int ldc_put_dring_entry(struct ldc_channel *lp,
124 				      void *buf, unsigned int len,
125 				      unsigned long offset,
126 				      struct ldc_trans_cookie *cookies,
127 				      int ncookies)
128 {
129 	return ldc_copy(lp, LDC_COPY_OUT, buf, len, offset, cookies, ncookies);
130 }
131 
132 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
133 			  struct ldc_trans_cookie *cookies,
134 			  int *ncookies, unsigned int map_perm);
135 
136 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf,
137 		        unsigned int len,
138 		        struct ldc_trans_cookie *cookies, int ncookies);
139 
140 #endif /* _SPARC64_LDC_H */
141