Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _FIREWIRE_CORE_H
3#define _FIREWIRE_CORE_H
4
5#include <linux/compiler.h>
6#include <linux/device.h>
7#include <linux/dma-mapping.h>
8#include <linux/fs.h>
9#include <linux/list.h>
10#include <linux/xarray.h>
11#include <linux/mm_types.h>
12#include <linux/rwsem.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15
16#include <linux/refcount.h>
17
18struct device;
19struct fw_card;
20struct fw_device;
21struct fw_iso_buffer;
22struct fw_iso_context;
23struct fw_iso_packet;
24struct fw_node;
25struct fw_packet;
26
27
28/* -card */
29
30// This is the arbitrary value we use to indicate a mismatched gap count.
31#define GAP_COUNT_MISMATCHED 0
32
33#define isoc_cycles_to_jiffies(cycles) usecs_to_jiffies((u32)div_u64((u64)cycles * USEC_PER_SEC, 8000))
34
35extern __printf(2, 3)
36void fw_err(const struct fw_card *card, const char *fmt, ...);
37extern __printf(2, 3)
38void fw_notice(const struct fw_card *card, const char *fmt, ...);
39
40/* bitfields within the PHY registers */
41#define PHY_LINK_ACTIVE 0x80
42#define PHY_CONTENDER 0x40
43#define PHY_BUS_RESET 0x40
44#define PHY_EXTENDED_REGISTERS 0xe0
45#define PHY_BUS_SHORT_RESET 0x40
46#define PHY_INT_STATUS_BITS 0x3c
47#define PHY_ENABLE_ACCEL 0x02
48#define PHY_ENABLE_MULTI 0x01
49#define PHY_PAGE_SELECT 0xe0
50
51#define BANDWIDTH_AVAILABLE_INITIAL 4915
52#define BROADCAST_CHANNEL_INITIAL (1 << 31 | 31)
53#define BROADCAST_CHANNEL_VALID (1 << 30)
54
55#define CSR_STATE_BIT_CMSTR (1 << 8)
56#define CSR_STATE_BIT_ABDICATE (1 << 10)
57
58struct fw_card_driver {
59 /*
60 * Enable the given card with the given initial config rom.
61 * This function is expected to activate the card, and either
62 * enable the PHY or set the link_on bit and initiate a bus
63 * reset.
64 */
65 int (*enable)(struct fw_card *card,
66 const __be32 *config_rom, size_t length);
67
68 int (*read_phy_reg)(struct fw_card *card, int address);
69 int (*update_phy_reg)(struct fw_card *card, int address,
70 int clear_bits, int set_bits);
71
72 /*
73 * Update the config rom for an enabled card. This function
74 * should change the config rom that is presented on the bus
75 * and initiate a bus reset.
76 */
77 int (*set_config_rom)(struct fw_card *card,
78 const __be32 *config_rom, size_t length);
79
80 void (*send_request)(struct fw_card *card, struct fw_packet *packet);
81 void (*send_response)(struct fw_card *card, struct fw_packet *packet);
82 /* Calling cancel is valid once a packet has been submitted. */
83 int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
84
85 /*
86 * Allow the specified node ID to do direct DMA out and in of
87 * host memory. The card will disable this for all node when
88 * a bus reset happens, so driver need to re-enable this after
89 * bus reset. Returns 0 on success, -ENODEV if the card
90 * doesn't support this, -ESTALE if the generation doesn't
91 * match.
92 */
93 int (*enable_phys_dma)(struct fw_card *card,
94 int node_id, int generation);
95
96 u32 (*read_csr)(struct fw_card *card, int csr_offset);
97 void (*write_csr)(struct fw_card *card, int csr_offset, u32 value);
98
99 struct fw_iso_context *
100 (*allocate_iso_context)(struct fw_card *card,
101 int type, int channel, size_t header_size);
102 void (*free_iso_context)(struct fw_iso_context *ctx);
103
104 int (*start_iso)(struct fw_iso_context *ctx,
105 s32 cycle, u32 sync, u32 tags);
106
107 int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);
108
109 int (*queue_iso)(struct fw_iso_context *ctx,
110 struct fw_iso_packet *packet,
111 struct fw_iso_buffer *buffer,
112 unsigned long payload);
113
114 void (*flush_queue_iso)(struct fw_iso_context *ctx);
115
116 int (*flush_iso_completions)(struct fw_iso_context *ctx);
117
118 int (*stop_iso)(struct fw_iso_context *ctx);
119};
120
121void fw_card_initialize(struct fw_card *card,
122 const struct fw_card_driver *driver, struct device *device);
123int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid,
124 unsigned int supported_isoc_contexts);
125void fw_core_remove_card(struct fw_card *card);
126int fw_compute_block_crc(__be32 *block);
127void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
128
129/* -cdev */
130
131extern const struct file_operations fw_device_ops;
132
133void fw_device_cdev_update(struct fw_device *device);
134void fw_device_cdev_remove(struct fw_device *device);
135void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);
136
137
138/* -device */
139
140extern struct rw_semaphore fw_device_rwsem;
141extern struct xarray fw_device_xa;
142extern int fw_cdev_major;
143
144static inline struct fw_device *fw_device_get(struct fw_device *device)
145{
146 get_device(&device->device);
147
148 return device;
149}
150
151static inline void fw_device_put(struct fw_device *device)
152{
153 put_device(&device->device);
154}
155
156struct fw_device *fw_device_get_by_devt(dev_t devt);
157int fw_device_set_broadcast_channel(struct device *dev, void *gen);
158void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
159
160
161/* -iso */
162
163int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
164int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
165 enum dma_data_direction direction);
166
167static inline void fw_iso_context_init_work(struct fw_iso_context *ctx, work_func_t func)
168{
169 INIT_WORK(&ctx->work, func);
170}
171
172
173/* -topology */
174
175// The initial value of BUS_MANAGER_ID register, to express nothing registered.
176#define BUS_MANAGER_ID_NOT_REGISTERED 0x3f
177
178enum {
179 FW_NODE_CREATED,
180 FW_NODE_UPDATED,
181 FW_NODE_DESTROYED,
182 FW_NODE_LINK_ON,
183 FW_NODE_LINK_OFF,
184 FW_NODE_INITIATED_RESET,
185};
186
187struct fw_node {
188 u16 node_id;
189 u8 color;
190 u8 port_count;
191 u8 link_on:1;
192 u8 initiated_reset:1;
193 u8 b_path:1;
194 u8 phy_speed:2; /* As in the self ID packet. */
195 u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
196 * local node to this node. */
197 u8 max_depth:4; /* Maximum depth to any leaf node */
198 u8 max_hops:4; /* Max hops in this sub tree */
199
200 struct kref kref;
201
202 /* For serializing node topology into a list. */
203 struct list_head link;
204
205 // The device when already associated, else NULL.
206 struct fw_device *device;
207
208 struct fw_node *ports[] __counted_by(port_count);
209};
210
211static inline struct fw_node *fw_node_get(struct fw_node *node)
212{
213 kref_get(&node->kref);
214
215 return node;
216}
217
218static void release_node(struct kref *kref)
219{
220 struct fw_node *node = container_of(kref, struct fw_node, kref);
221
222 kfree(node);
223}
224
225static inline void fw_node_put(struct fw_node *node)
226{
227 kref_put(&node->kref, release_node);
228}
229
230static inline struct fw_device *fw_node_get_device(struct fw_node *node)
231{
232 return node->device;
233}
234
235static inline void fw_node_set_device(struct fw_node *node, struct fw_device *device)
236{
237 node->device = device;
238}
239
240void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
241 int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
242void fw_destroy_nodes(struct fw_card *card);
243
244/*
245 * Check whether new_generation is the immediate successor of old_generation.
246 * Take counter roll-over at 255 (as per OHCI) into account.
247 */
248static inline bool is_next_generation(int new_generation, int old_generation)
249{
250 return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
251}
252
253
254/* -transaction */
255
256#define TCODE_LINK_INTERNAL 0xe
257
258static inline bool tcode_is_read_request(unsigned int tcode)
259{
260 return (tcode & ~1u) == 4u;
261}
262
263static inline bool tcode_is_block_packet(unsigned int tcode)
264{
265 return (tcode & 1u) != 0u;
266}
267
268static inline bool tcode_is_link_internal(unsigned int tcode)
269{
270 return (tcode == TCODE_LINK_INTERNAL);
271}
272
273#define LOCAL_BUS 0xffc0
274
275/* OHCI-1394's default upper bound for physical DMA: 4 GB */
276#define FW_MAX_PHYSICAL_RANGE (1ULL << 32)
277
278void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
279void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
280int fw_get_response_length(struct fw_request *request);
281void fw_fill_response(struct fw_packet *response, u32 *request_header,
282 int rcode, void *payload, size_t length);
283
284void fw_request_get(struct fw_request *request);
285void fw_request_put(struct fw_request *request);
286
287// Convert the value of IEEE 1394 CYCLE_TIME register to the format of timeStamp field in
288// descriptors of 1394 OHCI.
289static inline u32 cycle_time_to_ohci_tstamp(u32 tstamp)
290{
291 return (tstamp & 0x0ffff000) >> 12;
292}
293
294#define FW_PHY_CONFIG_NO_NODE_ID -1
295#define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1
296void fw_send_phy_config(struct fw_card *card,
297 int node_id, int generation, int gap_count);
298
299static inline bool is_ping_packet(u32 *data)
300{
301 return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
302}
303
304static inline bool is_in_fcp_region(u64 offset, size_t length)
305{
306 return offset >= (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
307 offset + length <= (CSR_REGISTER_BASE | CSR_FCP_END);
308}
309
310#endif /* _FIREWIRE_CORE_H */