1 #ifndef _FIREWIRE_CORE_H
2 #define _FIREWIRE_CORE_H
3
4 #include <linux/fs.h>
5 #include <linux/list.h>
6 #include <linux/idr.h>
7 #include <linux/mm_types.h>
8 #include <linux/rwsem.h>
9 #include <linux/slab.h>
10 #include <linux/types.h>
11
12 #include <asm/atomic.h>
13
14 struct device;
15 struct fw_card;
16 struct fw_device;
17 struct fw_iso_buffer;
18 struct fw_iso_context;
19 struct fw_iso_packet;
20 struct fw_node;
21 struct fw_packet;
22
23
24 /* -card */
25
26 /* bitfields within the PHY registers */
27 #define PHY_LINK_ACTIVE 0x80
28 #define PHY_CONTENDER 0x40
29 #define PHY_BUS_RESET 0x40
30 #define PHY_EXTENDED_REGISTERS 0xe0
31 #define PHY_BUS_SHORT_RESET 0x40
32 #define PHY_INT_STATUS_BITS 0x3c
33 #define PHY_ENABLE_ACCEL 0x02
34 #define PHY_ENABLE_MULTI 0x01
35 #define PHY_PAGE_SELECT 0xe0
36
37 #define BANDWIDTH_AVAILABLE_INITIAL 4915
38 #define BROADCAST_CHANNEL_INITIAL (1 << 31 | 31)
39 #define BROADCAST_CHANNEL_VALID (1 << 30)
40
41 #define CSR_STATE_BIT_CMSTR (1 << 8)
42 #define CSR_STATE_BIT_ABDICATE (1 << 10)
43
44 struct fw_card_driver {
45 /*
46 * Enable the given card with the given initial config rom.
47 * This function is expected to activate the card, and either
48 * enable the PHY or set the link_on bit and initiate a bus
49 * reset.
50 */
51 int (*enable)(struct fw_card *card,
52 const __be32 *config_rom, size_t length);
53
54 int (*read_phy_reg)(struct fw_card *card, int address);
55 int (*update_phy_reg)(struct fw_card *card, int address,
56 int clear_bits, int set_bits);
57
58 /*
59 * Update the config rom for an enabled card. This function
60 * should change the config rom that is presented on the bus
61 * and initiate a bus reset.
62 */
63 int (*set_config_rom)(struct fw_card *card,
64 const __be32 *config_rom, size_t length);
65
66 void (*send_request)(struct fw_card *card, struct fw_packet *packet);
67 void (*send_response)(struct fw_card *card, struct fw_packet *packet);
68 /* Calling cancel is valid once a packet has been submitted. */
69 int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
70
71 /*
72 * Allow the specified node ID to do direct DMA out and in of
73 * host memory. The card will disable this for all node when
74 * a bus reset happens, so driver need to reenable this after
75 * bus reset. Returns 0 on success, -ENODEV if the card
76 * doesn't support this, -ESTALE if the generation doesn't
77 * match.
78 */
79 int (*enable_phys_dma)(struct fw_card *card,
80 int node_id, int generation);
81
82 u32 (*read_csr)(struct fw_card *card, int csr_offset);
83 void (*write_csr)(struct fw_card *card, int csr_offset, u32 value);
84
85 struct fw_iso_context *
86 (*allocate_iso_context)(struct fw_card *card,
87 int type, int channel, size_t header_size);
88 void (*free_iso_context)(struct fw_iso_context *ctx);
89
90 int (*start_iso)(struct fw_iso_context *ctx,
91 s32 cycle, u32 sync, u32 tags);
92
93 int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);
94
95 int (*queue_iso)(struct fw_iso_context *ctx,
96 struct fw_iso_packet *packet,
97 struct fw_iso_buffer *buffer,
98 unsigned long payload);
99
100 int (*stop_iso)(struct fw_iso_context *ctx);
101 };
102
103 void fw_card_initialize(struct fw_card *card,
104 const struct fw_card_driver *driver, struct device *device);
105 int fw_card_add(struct fw_card *card,
106 u32 max_receive, u32 link_speed, u64 guid);
107 void fw_core_remove_card(struct fw_card *card);
108 int fw_compute_block_crc(__be32 *block);
109 void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset);
110 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
111
fw_card_get(struct fw_card * card)112 static inline struct fw_card *fw_card_get(struct fw_card *card)
113 {
114 kref_get(&card->kref);
115
116 return card;
117 }
118
119 void fw_card_release(struct kref *kref);
120
fw_card_put(struct fw_card * card)121 static inline void fw_card_put(struct fw_card *card)
122 {
123 kref_put(&card->kref, fw_card_release);
124 }
125
126
127 /* -cdev */
128
129 extern const struct file_operations fw_device_ops;
130
131 void fw_device_cdev_update(struct fw_device *device);
132 void fw_device_cdev_remove(struct fw_device *device);
133 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);
134
135
136 /* -device */
137
138 extern struct rw_semaphore fw_device_rwsem;
139 extern struct idr fw_device_idr;
140 extern int fw_cdev_major;
141
142 struct fw_device *fw_device_get_by_devt(dev_t devt);
143 int fw_device_set_broadcast_channel(struct device *dev, void *gen);
144 void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
145
146
147 /* -iso */
148
149 int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
150
151
152 /* -topology */
153
154 enum {
155 FW_NODE_CREATED,
156 FW_NODE_UPDATED,
157 FW_NODE_DESTROYED,
158 FW_NODE_LINK_ON,
159 FW_NODE_LINK_OFF,
160 FW_NODE_INITIATED_RESET,
161 };
162
163 struct fw_node {
164 u16 node_id;
165 u8 color;
166 u8 port_count;
167 u8 link_on:1;
168 u8 initiated_reset:1;
169 u8 b_path:1;
170 u8 phy_speed:2; /* As in the self ID packet. */
171 u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
172 * local node to this node. */
173 u8 max_depth:4; /* Maximum depth to any leaf node */
174 u8 max_hops:4; /* Max hops in this sub tree */
175 atomic_t ref_count;
176
177 /* For serializing node topology into a list. */
178 struct list_head link;
179
180 /* Upper layer specific data. */
181 void *data;
182
183 struct fw_node *ports[0];
184 };
185
fw_node_get(struct fw_node * node)186 static inline struct fw_node *fw_node_get(struct fw_node *node)
187 {
188 atomic_inc(&node->ref_count);
189
190 return node;
191 }
192
fw_node_put(struct fw_node * node)193 static inline void fw_node_put(struct fw_node *node)
194 {
195 if (atomic_dec_and_test(&node->ref_count))
196 kfree(node);
197 }
198
199 void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
200 int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
201 void fw_destroy_nodes(struct fw_card *card);
202
203 /*
204 * Check whether new_generation is the immediate successor of old_generation.
205 * Take counter roll-over at 255 (as per OHCI) into account.
206 */
is_next_generation(int new_generation,int old_generation)207 static inline bool is_next_generation(int new_generation, int old_generation)
208 {
209 return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
210 }
211
212
213 /* -transaction */
214
215 #define TCODE_LINK_INTERNAL 0xe
216
217 #define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4)
218 #define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0)
219 #define TCODE_IS_LINK_INTERNAL(tcode) ((tcode) == TCODE_LINK_INTERNAL)
220 #define TCODE_IS_REQUEST(tcode) (((tcode) & 2) == 0)
221 #define TCODE_IS_RESPONSE(tcode) (((tcode) & 2) != 0)
222 #define TCODE_HAS_REQUEST_DATA(tcode) (((tcode) & 12) != 4)
223 #define TCODE_HAS_RESPONSE_DATA(tcode) (((tcode) & 12) != 0)
224
225 #define LOCAL_BUS 0xffc0
226
227 void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
228 void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
229 int fw_get_response_length(struct fw_request *request);
230 void fw_fill_response(struct fw_packet *response, u32 *request_header,
231 int rcode, void *payload, size_t length);
232
233 #define FW_PHY_CONFIG_NO_NODE_ID -1
234 #define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1
235 void fw_send_phy_config(struct fw_card *card,
236 int node_id, int generation, int gap_count);
237
is_ping_packet(u32 * data)238 static inline bool is_ping_packet(u32 *data)
239 {
240 return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
241 }
242
243 #endif /* _FIREWIRE_CORE_H */
244