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Merge tag 'net-6.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
[linux-2.6-block.git] / drivers / firewire / core.h
... / ...
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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
30extern __printf(2, 3)
31void fw_err(const struct fw_card *card, const char *fmt, ...);
32extern __printf(2, 3)
33void fw_notice(const struct fw_card *card, const char *fmt, ...);
34
35/* bitfields within the PHY registers */
36#define PHY_LINK_ACTIVE 0x80
37#define PHY_CONTENDER 0x40
38#define PHY_BUS_RESET 0x40
39#define PHY_EXTENDED_REGISTERS 0xe0
40#define PHY_BUS_SHORT_RESET 0x40
41#define PHY_INT_STATUS_BITS 0x3c
42#define PHY_ENABLE_ACCEL 0x02
43#define PHY_ENABLE_MULTI 0x01
44#define PHY_PAGE_SELECT 0xe0
45
46#define BANDWIDTH_AVAILABLE_INITIAL 4915
47#define BROADCAST_CHANNEL_INITIAL (1 << 31 | 31)
48#define BROADCAST_CHANNEL_VALID (1 << 30)
49
50#define CSR_STATE_BIT_CMSTR (1 << 8)
51#define CSR_STATE_BIT_ABDICATE (1 << 10)
52
53struct fw_card_driver {
54 /*
55 * Enable the given card with the given initial config rom.
56 * This function is expected to activate the card, and either
57 * enable the PHY or set the link_on bit and initiate a bus
58 * reset.
59 */
60 int (*enable)(struct fw_card *card,
61 const __be32 *config_rom, size_t length);
62
63 int (*read_phy_reg)(struct fw_card *card, int address);
64 int (*update_phy_reg)(struct fw_card *card, int address,
65 int clear_bits, int set_bits);
66
67 /*
68 * Update the config rom for an enabled card. This function
69 * should change the config rom that is presented on the bus
70 * and initiate a bus reset.
71 */
72 int (*set_config_rom)(struct fw_card *card,
73 const __be32 *config_rom, size_t length);
74
75 void (*send_request)(struct fw_card *card, struct fw_packet *packet);
76 void (*send_response)(struct fw_card *card, struct fw_packet *packet);
77 /* Calling cancel is valid once a packet has been submitted. */
78 int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
79
80 /*
81 * Allow the specified node ID to do direct DMA out and in of
82 * host memory. The card will disable this for all node when
83 * a bus reset happens, so driver need to re-enable this after
84 * bus reset. Returns 0 on success, -ENODEV if the card
85 * doesn't support this, -ESTALE if the generation doesn't
86 * match.
87 */
88 int (*enable_phys_dma)(struct fw_card *card,
89 int node_id, int generation);
90
91 u32 (*read_csr)(struct fw_card *card, int csr_offset);
92 void (*write_csr)(struct fw_card *card, int csr_offset, u32 value);
93
94 struct fw_iso_context *
95 (*allocate_iso_context)(struct fw_card *card,
96 int type, int channel, size_t header_size);
97 void (*free_iso_context)(struct fw_iso_context *ctx);
98
99 int (*start_iso)(struct fw_iso_context *ctx,
100 s32 cycle, u32 sync, u32 tags);
101
102 int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);
103
104 int (*queue_iso)(struct fw_iso_context *ctx,
105 struct fw_iso_packet *packet,
106 struct fw_iso_buffer *buffer,
107 unsigned long payload);
108
109 void (*flush_queue_iso)(struct fw_iso_context *ctx);
110
111 int (*flush_iso_completions)(struct fw_iso_context *ctx);
112
113 int (*stop_iso)(struct fw_iso_context *ctx);
114};
115
116void fw_card_initialize(struct fw_card *card,
117 const struct fw_card_driver *driver, struct device *device);
118int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid,
119 unsigned int supported_isoc_contexts);
120void fw_core_remove_card(struct fw_card *card);
121int fw_compute_block_crc(__be32 *block);
122void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
123
124/* -cdev */
125
126extern const struct file_operations fw_device_ops;
127
128void fw_device_cdev_update(struct fw_device *device);
129void fw_device_cdev_remove(struct fw_device *device);
130void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);
131
132
133/* -device */
134
135extern struct rw_semaphore fw_device_rwsem;
136extern struct xarray fw_device_xa;
137extern int fw_cdev_major;
138
139static inline struct fw_device *fw_device_get(struct fw_device *device)
140{
141 get_device(&device->device);
142
143 return device;
144}
145
146static inline void fw_device_put(struct fw_device *device)
147{
148 put_device(&device->device);
149}
150
151struct fw_device *fw_device_get_by_devt(dev_t devt);
152int fw_device_set_broadcast_channel(struct device *dev, void *gen);
153void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
154
155
156/* -iso */
157
158int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
159int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
160 enum dma_data_direction direction);
161
162static inline void fw_iso_context_init_work(struct fw_iso_context *ctx, work_func_t func)
163{
164 INIT_WORK(&ctx->work, func);
165}
166
167
168/* -topology */
169
170enum {
171 FW_NODE_CREATED,
172 FW_NODE_UPDATED,
173 FW_NODE_DESTROYED,
174 FW_NODE_LINK_ON,
175 FW_NODE_LINK_OFF,
176 FW_NODE_INITIATED_RESET,
177};
178
179struct fw_node {
180 u16 node_id;
181 u8 color;
182 u8 port_count;
183 u8 link_on:1;
184 u8 initiated_reset:1;
185 u8 b_path:1;
186 u8 phy_speed:2; /* As in the self ID packet. */
187 u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
188 * local node to this node. */
189 u8 max_depth:4; /* Maximum depth to any leaf node */
190 u8 max_hops:4; /* Max hops in this sub tree */
191
192 struct kref kref;
193
194 /* For serializing node topology into a list. */
195 struct list_head link;
196
197 /* Upper layer specific data. */
198 void *data;
199
200 struct fw_node *ports[] __counted_by(port_count);
201};
202
203static inline struct fw_node *fw_node_get(struct fw_node *node)
204{
205 kref_get(&node->kref);
206
207 return node;
208}
209
210static void release_node(struct kref *kref)
211{
212 struct fw_node *node = container_of(kref, struct fw_node, kref);
213
214 kfree(node);
215}
216
217static inline void fw_node_put(struct fw_node *node)
218{
219 kref_put(&node->kref, release_node);
220}
221
222void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
223 int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
224void fw_destroy_nodes(struct fw_card *card);
225
226/*
227 * Check whether new_generation is the immediate successor of old_generation.
228 * Take counter roll-over at 255 (as per OHCI) into account.
229 */
230static inline bool is_next_generation(int new_generation, int old_generation)
231{
232 return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
233}
234
235
236/* -transaction */
237
238#define TCODE_LINK_INTERNAL 0xe
239
240static inline bool tcode_is_read_request(unsigned int tcode)
241{
242 return (tcode & ~1u) == 4u;
243}
244
245static inline bool tcode_is_block_packet(unsigned int tcode)
246{
247 return (tcode & 1u) != 0u;
248}
249
250static inline bool tcode_is_link_internal(unsigned int tcode)
251{
252 return (tcode == TCODE_LINK_INTERNAL);
253}
254
255#define LOCAL_BUS 0xffc0
256
257/* OHCI-1394's default upper bound for physical DMA: 4 GB */
258#define FW_MAX_PHYSICAL_RANGE (1ULL << 32)
259
260void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
261void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
262int fw_get_response_length(struct fw_request *request);
263void fw_fill_response(struct fw_packet *response, u32 *request_header,
264 int rcode, void *payload, size_t length);
265
266void fw_request_get(struct fw_request *request);
267void fw_request_put(struct fw_request *request);
268
269// Convert the value of IEEE 1394 CYCLE_TIME register to the format of timeStamp field in
270// descriptors of 1394 OHCI.
271static inline u32 cycle_time_to_ohci_tstamp(u32 tstamp)
272{
273 return (tstamp & 0x0ffff000) >> 12;
274}
275
276#define FW_PHY_CONFIG_NO_NODE_ID -1
277#define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1
278void fw_send_phy_config(struct fw_card *card,
279 int node_id, int generation, int gap_count);
280
281static inline bool is_ping_packet(u32 *data)
282{
283 return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
284}
285
286static inline bool is_in_fcp_region(u64 offset, size_t length)
287{
288 return offset >= (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
289 offset + length <= (CSR_REGISTER_BASE | CSR_FCP_END);
290}
291
292#endif /* _FIREWIRE_CORE_H */
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