summaryrefslogtreecommitdiff
path: root/drivers/ntb/ntb_hw.h
blob: ddbcbfda0f49c0c150fea4d76f21a2a542100236 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 *   redistributing this file, you may do so under either license.
 *
 *   GPL LICENSE SUMMARY
 *
 *   Copyright(c) 2012 Intel Corporation. All rights reserved.
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of version 2 of the GNU General Public License as
 *   published by the Free Software Foundation.
 *
 *   BSD LICENSE
 *
 *   Copyright(c) 2012 Intel Corporation. All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copy
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Intel PCIe NTB Linux driver
 *
 * Contact Information:
 * Jon Mason <jon.mason@intel.com>
 */
#include <linux/ntb.h>

#define PCI_DEVICE_ID_INTEL_NTB_B2B_JSF		0x3725
#define PCI_DEVICE_ID_INTEL_NTB_PS_JSF		0x3726
#define PCI_DEVICE_ID_INTEL_NTB_SS_JSF		0x3727
#define PCI_DEVICE_ID_INTEL_NTB_B2B_SNB		0x3C0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_SNB		0x3C0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_SNB		0x3C0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_IVT		0x0E0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_IVT		0x0E0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_IVT		0x0E0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_HSX		0x2F0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_HSX		0x2F0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_HSX		0x2F0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD		0x0C4E

#ifndef readq
static inline u64 readq(void __iomem *addr)
{
	return readl(addr) | (((u64) readl(addr + 4)) << 32LL);
}
#endif

#ifndef writeq
static inline void writeq(u64 val, void __iomem *addr)
{
	writel(val & 0xffffffff, addr);
	writel(val >> 32, addr + 4);
}
#endif

#define NTB_BAR_MMIO		0
#define NTB_BAR_23		2
#define NTB_BAR_45		4
#define NTB_BAR_MASK		((1 << NTB_BAR_MMIO) | (1 << NTB_BAR_23) |\
				 (1 << NTB_BAR_45))

#define NTB_HB_TIMEOUT		msecs_to_jiffies(1000)

#define NTB_MAX_NUM_MW		2

enum ntb_hw_event {
	NTB_EVENT_SW_EVENT0 = 0,
	NTB_EVENT_SW_EVENT1,
	NTB_EVENT_SW_EVENT2,
	NTB_EVENT_HW_ERROR,
	NTB_EVENT_HW_LINK_UP,
	NTB_EVENT_HW_LINK_DOWN,
};

struct ntb_mw {
	dma_addr_t phys_addr;
	void __iomem *vbase;
	resource_size_t bar_sz;
};

struct ntb_db_cb {
	int (*callback)(void *data, int db_num);
	unsigned int db_num;
	void *data;
	struct ntb_device *ndev;
	struct tasklet_struct irq_work;
};

struct ntb_device {
	struct pci_dev *pdev;
	struct msix_entry *msix_entries;
	void __iomem *reg_base;
	struct ntb_mw mw[NTB_MAX_NUM_MW];
	struct {
		unsigned char max_mw;
		unsigned char max_spads;
		unsigned char max_db_bits;
		unsigned char msix_cnt;
	} limits;
	struct {
		void __iomem *ldb;
		void __iomem *ldb_mask;
		void __iomem *rdb;
		void __iomem *bar2_xlat;
		void __iomem *bar4_xlat;
		void __iomem *spad_write;
		void __iomem *spad_read;
		void __iomem *lnk_cntl;
		void __iomem *lnk_stat;
		void __iomem *spci_cmd;
	} reg_ofs;
	struct ntb_transport *ntb_transport;
	void (*event_cb)(void *handle, enum ntb_hw_event event);

	struct ntb_db_cb *db_cb;
	unsigned char hw_type;
	unsigned char conn_type;
	unsigned char dev_type;
	unsigned char num_msix;
	unsigned char bits_per_vector;
	unsigned char max_cbs;
	unsigned char link_width;
	unsigned char link_speed;
	unsigned char link_status;

	struct delayed_work hb_timer;
	unsigned long last_ts;

	struct delayed_work lr_timer;

	struct dentry *debugfs_dir;
	struct dentry *debugfs_info;
};

/**
 * ntb_max_cbs() - return the max callbacks
 * @ndev: pointer to ntb_device instance
 *
 * Given the ntb pointer, return the maximum number of callbacks
 *
 * RETURNS: the maximum number of callbacks
 */
static inline unsigned char ntb_max_cbs(struct ntb_device *ndev)
{
	return ndev->max_cbs;
}

/**
 * ntb_max_mw() - return the max number of memory windows
 * @ndev: pointer to ntb_device instance
 *
 * Given the ntb pointer, return the maximum number of memory windows
 *
 * RETURNS: the maximum number of memory windows
 */
static inline unsigned char ntb_max_mw(struct ntb_device *ndev)
{
	return ndev->limits.max_mw;
}

/**
 * ntb_hw_link_status() - return the hardware link status
 * @ndev: pointer to ntb_device instance
 *
 * Returns true if the hardware is connected to the remote system
 *
 * RETURNS: true or false based on the hardware link state
 */
static inline bool ntb_hw_link_status(struct ntb_device *ndev)
{
	return ndev->link_status == NTB_LINK_UP;
}

/**
 * ntb_query_pdev() - return the pci_dev pointer
 * @ndev: pointer to ntb_device instance
 *
 * Given the ntb pointer, return the pci_dev pointer for the NTB hardware device
 *
 * RETURNS: a pointer to the ntb pci_dev
 */
static inline struct pci_dev *ntb_query_pdev(struct ntb_device *ndev)
{
	return ndev->pdev;
}

/**
 * ntb_query_debugfs() - return the debugfs pointer
 * @ndev: pointer to ntb_device instance
 *
 * Given the ntb pointer, return the debugfs directory pointer for the NTB
 * hardware device
 *
 * RETURNS: a pointer to the debugfs directory
 */
static inline struct dentry *ntb_query_debugfs(struct ntb_device *ndev)
{
	return ndev->debugfs_dir;
}

struct ntb_device *ntb_register_transport(struct pci_dev *pdev,
					  void *transport);
void ntb_unregister_transport(struct ntb_device *ndev);
void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr);
int ntb_register_db_callback(struct ntb_device *ndev, unsigned int idx,
			     void *data, int (*db_cb_func)(void *data,
							   int db_num));
void ntb_unregister_db_callback(struct ntb_device *ndev, unsigned int idx);
int ntb_register_event_callback(struct ntb_device *ndev,
				void (*event_cb_func)(void *handle,
						      enum ntb_hw_event event));
void ntb_unregister_event_callback(struct ntb_device *ndev);
int ntb_get_max_spads(struct ntb_device *ndev);
int ntb_write_local_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
int ntb_read_local_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
int ntb_write_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
resource_size_t ntb_get_mw_base(struct ntb_device *ndev, unsigned int mw);
void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw);
u64 ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw);
void ntb_ring_doorbell(struct ntb_device *ndev, unsigned int idx);
void *ntb_find_transport(struct pci_dev *pdev);

int ntb_transport_init(struct pci_dev *pdev);
void ntb_transport_free(void *transport);