tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
4 *
5 * GPL LICENSE SUMMARY
6 *
7 * Copyright(c) 2012 Intel Corporation. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * BSD LICENSE
14 *
15 * Copyright(c) 2012 Intel Corporation. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 *
21 * * Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * * Redistributions in binary form must reproduce the above copy
24 * notice, this list of conditions and the following disclaimer in
25 * the documentation and/or other materials provided with the
26 * distribution.
27 * * Neither the name of Intel Corporation nor the names of its
28 * contributors may be used to endorse or promote products derived
29 * from this software without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 *
43 * Intel PCIe NTB Linux driver
44 *
45 * Contact Information:
46 * Jon Mason <jon.mason@intel.com>
47 */
48#include <linux/ntb.h>
49
50#define PCI_DEVICE_ID_INTEL_NTB_B2B_JSF 0x3725
51#define PCI_DEVICE_ID_INTEL_NTB_PS_JSF 0x3726
52#define PCI_DEVICE_ID_INTEL_NTB_SS_JSF 0x3727
53#define PCI_DEVICE_ID_INTEL_NTB_B2B_SNB 0x3C0D
54#define PCI_DEVICE_ID_INTEL_NTB_PS_SNB 0x3C0E
55#define PCI_DEVICE_ID_INTEL_NTB_SS_SNB 0x3C0F
56#define PCI_DEVICE_ID_INTEL_NTB_B2B_IVT 0x0E0D
57#define PCI_DEVICE_ID_INTEL_NTB_PS_IVT 0x0E0E
58#define PCI_DEVICE_ID_INTEL_NTB_SS_IVT 0x0E0F
59#define PCI_DEVICE_ID_INTEL_NTB_B2B_HSX 0x2F0D
60#define PCI_DEVICE_ID_INTEL_NTB_PS_HSX 0x2F0E
61#define PCI_DEVICE_ID_INTEL_NTB_SS_HSX 0x2F0F
62#define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD 0x0C4E
63
64#ifndef readq
65static inline u64 readq(void __iomem *addr)
66{
67 return readl(addr) | (((u64) readl(addr + 4)) << 32LL);
68}
69#endif
70
71#ifndef writeq
72static inline void writeq(u64 val, void __iomem *addr)
73{
74 writel(val & 0xffffffff, addr);
75 writel(val >> 32, addr + 4);
76}
77#endif
78
79#define NTB_BAR_MMIO 0
80#define NTB_BAR_23 2
81#define NTB_BAR_45 4
82#define NTB_BAR_MASK ((1 << NTB_BAR_MMIO) | (1 << NTB_BAR_23) |\
83 (1 << NTB_BAR_45))
84
85#define NTB_HB_TIMEOUT msecs_to_jiffies(1000)
86
87#define NTB_MAX_NUM_MW 2
88
89enum ntb_hw_event {
90 NTB_EVENT_SW_EVENT0 = 0,
91 NTB_EVENT_SW_EVENT1,
92 NTB_EVENT_SW_EVENT2,
93 NTB_EVENT_HW_ERROR,
94 NTB_EVENT_HW_LINK_UP,
95 NTB_EVENT_HW_LINK_DOWN,
96};
97
98struct ntb_mw {
99 dma_addr_t phys_addr;
100 void __iomem *vbase;
101 resource_size_t bar_sz;
102};
103
104struct ntb_db_cb {
105 int (*callback)(void *data, int db_num);
106 unsigned int db_num;
107 void *data;
108 struct ntb_device *ndev;
109 struct tasklet_struct irq_work;
110};
111
112struct ntb_device {
113 struct pci_dev *pdev;
114 struct msix_entry *msix_entries;
115 void __iomem *reg_base;
116 struct ntb_mw mw[NTB_MAX_NUM_MW];
117 struct {
118 unsigned char max_mw;
119 unsigned char max_spads;
120 unsigned char max_db_bits;
121 unsigned char msix_cnt;
122 } limits;
123 struct {
124 void __iomem *ldb;
125 void __iomem *ldb_mask;
126 void __iomem *rdb;
127 void __iomem *bar2_xlat;
128 void __iomem *bar4_xlat;
129 void __iomem *spad_write;
130 void __iomem *spad_read;
131 void __iomem *lnk_cntl;
132 void __iomem *lnk_stat;
133 void __iomem *spci_cmd;
134 } reg_ofs;
135 struct ntb_transport *ntb_transport;
136 void (*event_cb)(void *handle, enum ntb_hw_event event);
137
138 struct ntb_db_cb *db_cb;
139 unsigned char hw_type;
140 unsigned char conn_type;
141 unsigned char dev_type;
142 unsigned char num_msix;
143 unsigned char bits_per_vector;
144 unsigned char max_cbs;
145 unsigned char link_width;
146 unsigned char link_speed;
147 unsigned char link_status;
148
149 struct delayed_work hb_timer;
150 unsigned long last_ts;
151
152 struct delayed_work lr_timer;
153
154 struct dentry *debugfs_dir;
155};
156
157/**
158 * ntb_max_cbs() - return the max callbacks
159 * @ndev: pointer to ntb_device instance
160 *
161 * Given the ntb pointer, return the maximum number of callbacks
162 *
163 * RETURNS: the maximum number of callbacks
164 */
165static inline unsigned char ntb_max_cbs(struct ntb_device *ndev)
166{
167 return ndev->max_cbs;
168}
169
170/**
171 * ntb_max_mw() - return the max number of memory windows
172 * @ndev: pointer to ntb_device instance
173 *
174 * Given the ntb pointer, return the maximum number of memory windows
175 *
176 * RETURNS: the maximum number of memory windows
177 */
178static inline unsigned char ntb_max_mw(struct ntb_device *ndev)
179{
180 return ndev->limits.max_mw;
181}
182
183/**
184 * ntb_hw_link_status() - return the hardware link status
185 * @ndev: pointer to ntb_device instance
186 *
187 * Returns true if the hardware is connected to the remote system
188 *
189 * RETURNS: true or false based on the hardware link state
190 */
191static inline bool ntb_hw_link_status(struct ntb_device *ndev)
192{
193 return ndev->link_status == NTB_LINK_UP;
194}
195
196/**
197 * ntb_query_pdev() - return the pci_dev pointer
198 * @ndev: pointer to ntb_device instance
199 *
200 * Given the ntb pointer, return the pci_dev pointer for the NTB hardware device
201 *
202 * RETURNS: a pointer to the ntb pci_dev
203 */
204static inline struct pci_dev *ntb_query_pdev(struct ntb_device *ndev)
205{
206 return ndev->pdev;
207}
208
209/**
210 * ntb_query_debugfs() - return the debugfs pointer
211 * @ndev: pointer to ntb_device instance
212 *
213 * Given the ntb pointer, return the debugfs directory pointer for the NTB
214 * hardware device
215 *
216 * RETURNS: a pointer to the debugfs directory
217 */
218static inline struct dentry *ntb_query_debugfs(struct ntb_device *ndev)
219{
220 return ndev->debugfs_dir;
221}
222
223struct ntb_device *ntb_register_transport(struct pci_dev *pdev,
224 void *transport);
225void ntb_unregister_transport(struct ntb_device *ndev);
226void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr);
227int ntb_register_db_callback(struct ntb_device *ndev, unsigned int idx,
228 void *data, int (*db_cb_func)(void *data,
229 int db_num));
230void ntb_unregister_db_callback(struct ntb_device *ndev, unsigned int idx);
231int ntb_register_event_callback(struct ntb_device *ndev,
232 void (*event_cb_func)(void *handle,
233 enum ntb_hw_event event));
234void ntb_unregister_event_callback(struct ntb_device *ndev);
235int ntb_get_max_spads(struct ntb_device *ndev);
236int ntb_write_local_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
237int ntb_read_local_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
238int ntb_write_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
239int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
240resource_size_t ntb_get_mw_base(struct ntb_device *ndev, unsigned int mw);
241void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw);
242u64 ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw);
243void ntb_ring_doorbell(struct ntb_device *ndev, unsigned int idx);
244void *ntb_find_transport(struct pci_dev *pdev);
245
246int ntb_transport_init(struct pci_dev *pdev);
247void ntb_transport_free(void *transport);