tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Intel MIC Platform Software Stack (MPSS)
3 *
4 * Copyright(c) 2013 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2, as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * The full GNU General Public License is included in this distribution in
16 * the file called "COPYING".
17 *
18 * Disclaimer: The codes contained in these modules may be specific to
19 * the Intel Software Development Platform codenamed: Knights Ferry, and
20 * the Intel product codenamed: Knights Corner, and are not backward
21 * compatible with other Intel products. Additionally, Intel will NOT
22 * support the codes or instruction set in future products.
23 *
24 * Intel MIC Card driver.
25 *
26 */
27#include <linux/module.h>
28#include <linux/pci.h>
29#include <linux/platform_device.h>
30
31#include "../common/mic_dev.h"
32#include "mic_device.h"
33#include "mic_x100.h"
34
35static const char mic_driver_name[] = "mic";
36
37static struct mic_driver g_drv;
38
39/**
40 * mic_read_spad - read from the scratchpad register
41 * @mdev: pointer to mic_device instance
42 * @idx: index to scratchpad register, 0 based
43 *
44 * This function allows reading of the 32bit scratchpad register.
45 *
46 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
47 */
48u32 mic_read_spad(struct mic_device *mdev, unsigned int idx)
49{
50 return mic_mmio_read(&mdev->mmio,
51 MIC_X100_SBOX_BASE_ADDRESS +
52 MIC_X100_SBOX_SPAD0 + idx * 4);
53}
54
55/**
56 * __mic_send_intr - Send interrupt to Host.
57 * @mdev: pointer to mic_device instance
58 * @doorbell: Doorbell number.
59 */
60void mic_send_intr(struct mic_device *mdev, int doorbell)
61{
62 struct mic_mw *mw = &mdev->mmio;
63
64 if (doorbell > MIC_X100_MAX_DOORBELL_IDX)
65 return;
66 /* Ensure that the interrupt is ordered w.r.t previous stores. */
67 wmb();
68 mic_mmio_write(mw, MIC_X100_SBOX_SDBIC0_DBREQ_BIT,
69 MIC_X100_SBOX_BASE_ADDRESS +
70 (MIC_X100_SBOX_SDBIC0 + (4 * doorbell)));
71}
72
73/**
74 * mic_ack_interrupt - Device specific interrupt handling.
75 * @mdev: pointer to mic_device instance
76 *
77 * Returns: bitmask of doorbell events triggered.
78 */
79u32 mic_ack_interrupt(struct mic_device *mdev)
80{
81 return 0;
82}
83
84static inline int mic_get_sbox_irq(int db)
85{
86 return MIC_X100_IRQ_BASE + db;
87}
88
89static inline int mic_get_rdmasr_irq(int index)
90{
91 return MIC_X100_RDMASR_IRQ_BASE + index;
92}
93
94/**
95 * mic_hw_intr_init - Initialize h/w specific interrupt
96 * information.
97 * @mdrv: pointer to mic_driver
98 */
99void mic_hw_intr_init(struct mic_driver *mdrv)
100{
101 mdrv->intr_info.num_intr = MIC_X100_NUM_SBOX_IRQ +
102 MIC_X100_NUM_RDMASR_IRQ;
103}
104
105/**
106 * mic_db_to_irq - Retrieve irq number corresponding to a doorbell.
107 * @mdrv: pointer to mic_driver
108 * @db: The doorbell obtained for which the irq is needed. Doorbell
109 * may correspond to an sbox doorbell or an rdmasr index.
110 *
111 * Returns the irq corresponding to the doorbell.
112 */
113int mic_db_to_irq(struct mic_driver *mdrv, int db)
114{
115 int rdmasr_index;
116 if (db < MIC_X100_NUM_SBOX_IRQ) {
117 return mic_get_sbox_irq(db);
118 } else {
119 rdmasr_index = db - MIC_X100_NUM_SBOX_IRQ +
120 MIC_X100_RDMASR_IRQ_BASE;
121 return mic_get_rdmasr_irq(rdmasr_index);
122 }
123}
124
125/*
126 * mic_card_map - Allocate virtual address for a remote memory region.
127 * @mdev: pointer to mic_device instance.
128 * @addr: Remote DMA address.
129 * @size: Size of the region.
130 *
131 * Returns: Virtual address backing the remote memory region.
132 */
133void __iomem *
134mic_card_map(struct mic_device *mdev, dma_addr_t addr, size_t size)
135{
136 return ioremap(addr, size);
137}
138
139/*
140 * mic_card_unmap - Unmap the virtual address for a remote memory region.
141 * @mdev: pointer to mic_device instance.
142 * @addr: Virtual address for remote memory region.
143 *
144 * Returns: None.
145 */
146void mic_card_unmap(struct mic_device *mdev, void __iomem *addr)
147{
148 iounmap(addr);
149}
150
151static int __init mic_probe(struct platform_device *pdev)
152{
153 struct mic_driver *mdrv = &g_drv;
154 struct mic_device *mdev = &mdrv->mdev;
155 int rc = 0;
156
157 mdrv->dev = &pdev->dev;
158 snprintf(mdrv->name, sizeof(mic_driver_name), mic_driver_name);
159
160 mdev->mmio.pa = MIC_X100_MMIO_BASE;
161 mdev->mmio.len = MIC_X100_MMIO_LEN;
162 mdev->mmio.va = ioremap(MIC_X100_MMIO_BASE, MIC_X100_MMIO_LEN);
163 if (!mdev->mmio.va) {
164 dev_err(&pdev->dev, "Cannot remap MMIO BAR\n");
165 rc = -EIO;
166 goto done;
167 }
168 mic_hw_intr_init(mdrv);
169 rc = mic_driver_init(mdrv);
170 if (rc) {
171 dev_err(&pdev->dev, "mic_driver_init failed rc %d\n", rc);
172 goto iounmap;
173 }
174done:
175 return rc;
176iounmap:
177 iounmap(mdev->mmio.va);
178 return rc;
179}
180
181static int mic_remove(struct platform_device *pdev)
182{
183 struct mic_driver *mdrv = &g_drv;
184 struct mic_device *mdev = &mdrv->mdev;
185
186 mic_driver_uninit(mdrv);
187 iounmap(mdev->mmio.va);
188 return 0;
189}
190
191static void mic_platform_shutdown(struct platform_device *pdev)
192{
193 mic_remove(pdev);
194}
195
196static struct platform_device mic_platform_dev = {
197 .name = mic_driver_name,
198 .id = 0,
199 .num_resources = 0,
200};
201
202static struct platform_driver __refdata mic_platform_driver = {
203 .probe = mic_probe,
204 .remove = mic_remove,
205 .shutdown = mic_platform_shutdown,
206 .driver = {
207 .name = mic_driver_name,
208 .owner = THIS_MODULE,
209 },
210};
211
212static int __init mic_init(void)
213{
214 int ret;
215 struct cpuinfo_x86 *c = &cpu_data(0);
216
217 if (!(c->x86 == 11 && c->x86_model == 1)) {
218 ret = -ENODEV;
219 pr_err("%s not running on X100 ret %d\n", __func__, ret);
220 goto done;
221 }
222
223 mic_init_card_debugfs();
224 ret = platform_device_register(&mic_platform_dev);
225 if (ret) {
226 pr_err("platform_device_register ret %d\n", ret);
227 goto cleanup_debugfs;
228 }
229 ret = platform_driver_register(&mic_platform_driver);
230 if (ret) {
231 pr_err("platform_driver_register ret %d\n", ret);
232 goto device_unregister;
233 }
234 return ret;
235
236device_unregister:
237 platform_device_unregister(&mic_platform_dev);
238cleanup_debugfs:
239 mic_exit_card_debugfs();
240done:
241 return ret;
242}
243
244static void __exit mic_exit(void)
245{
246 platform_driver_unregister(&mic_platform_driver);
247 platform_device_unregister(&mic_platform_dev);
248 mic_exit_card_debugfs();
249}
250
251module_init(mic_init);
252module_exit(mic_exit);
253
254MODULE_AUTHOR("Intel Corporation");
255MODULE_DESCRIPTION("Intel(R) MIC X100 Card driver");
256MODULE_LICENSE("GPL v2");