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
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
|
/*
* PCI bus driver for Bosch C_CAN/D_CAN controller
*
* Copyright (C) 2012 Federico Vaga <federico.vaga@gmail.com>
*
* Borrowed from c_can_platform.c
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/can/dev.h>
#include "c_can.h"
#define PCI_DEVICE_ID_PCH_CAN 0x8818
#define PCH_PCI_SOFT_RESET 0x01fc
enum c_can_pci_reg_align {
C_CAN_REG_ALIGN_16,
C_CAN_REG_ALIGN_32,
C_CAN_REG_32,
};
struct c_can_pci_data {
/* Specify if is C_CAN or D_CAN */
enum c_can_dev_id type;
/* Set the register alignment in the memory */
enum c_can_pci_reg_align reg_align;
/* Set the frequency */
unsigned int freq;
/* PCI bar number */
int bar;
/* Callback for reset */
void (*init)(const struct c_can_priv *priv, bool enable);
};
/*
* 16-bit c_can registers can be arranged differently in the memory
* architecture of different implementations. For example: 16-bit
* registers can be aligned to a 16-bit boundary or 32-bit boundary etc.
* Handle the same by providing a common read/write interface.
*/
static u16 c_can_pci_read_reg_aligned_to_16bit(const struct c_can_priv *priv,
enum reg index)
{
return readw(priv->base + priv->regs[index]);
}
static void c_can_pci_write_reg_aligned_to_16bit(const struct c_can_priv *priv,
enum reg index, u16 val)
{
writew(val, priv->base + priv->regs[index]);
}
static u16 c_can_pci_read_reg_aligned_to_32bit(const struct c_can_priv *priv,
enum reg index)
{
return readw(priv->base + 2 * priv->regs[index]);
}
static void c_can_pci_write_reg_aligned_to_32bit(const struct c_can_priv *priv,
enum reg index, u16 val)
{
writew(val, priv->base + 2 * priv->regs[index]);
}
static u16 c_can_pci_read_reg_32bit(const struct c_can_priv *priv,
enum reg index)
{
return (u16)ioread32(priv->base + 2 * priv->regs[index]);
}
static void c_can_pci_write_reg_32bit(const struct c_can_priv *priv,
enum reg index, u16 val)
{
iowrite32((u32)val, priv->base + 2 * priv->regs[index]);
}
static u32 c_can_pci_read_reg32(const struct c_can_priv *priv, enum reg index)
{
u32 val;
val = priv->read_reg(priv, index);
val |= ((u32) priv->read_reg(priv, index + 1)) << 16;
return val;
}
static void c_can_pci_write_reg32(const struct c_can_priv *priv, enum reg index,
u32 val)
{
priv->write_reg(priv, index + 1, val >> 16);
priv->write_reg(priv, index, val);
}
static void c_can_pci_reset_pch(const struct c_can_priv *priv, bool enable)
{
if (enable) {
u32 __iomem *addr = priv->base + PCH_PCI_SOFT_RESET;
/* write to sw reset register */
iowrite32(1, addr);
iowrite32(0, addr);
}
}
static int c_can_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct c_can_pci_data *c_can_pci_data = (void *)ent->driver_data;
struct c_can_priv *priv;
struct net_device *dev;
void __iomem *addr;
int ret;
ret = pci_enable_device(pdev);
if (ret) {
dev_err(&pdev->dev, "pci_enable_device FAILED\n");
goto out;
}
ret = pci_request_regions(pdev, KBUILD_MODNAME);
if (ret) {
dev_err(&pdev->dev, "pci_request_regions FAILED\n");
goto out_disable_device;
}
ret = pci_enable_msi(pdev);
if (!ret) {
dev_info(&pdev->dev, "MSI enabled\n");
pci_set_master(pdev);
}
addr = pci_iomap(pdev, c_can_pci_data->bar,
pci_resource_len(pdev, c_can_pci_data->bar));
if (!addr) {
dev_err(&pdev->dev,
"device has no PCI memory resources, "
"failing adapter\n");
ret = -ENOMEM;
goto out_release_regions;
}
/* allocate the c_can device */
dev = alloc_c_can_dev();
if (!dev) {
ret = -ENOMEM;
goto out_iounmap;
}
priv = netdev_priv(dev);
pci_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
dev->irq = pdev->irq;
priv->base = addr;
priv->device = &pdev->dev;
if (!c_can_pci_data->freq) {
dev_err(&pdev->dev, "no clock frequency defined\n");
ret = -ENODEV;
goto out_free_c_can;
} else {
priv->can.clock.freq = c_can_pci_data->freq;
}
/* Configure CAN type */
switch (c_can_pci_data->type) {
case BOSCH_C_CAN:
priv->regs = reg_map_c_can;
break;
case BOSCH_D_CAN:
priv->regs = reg_map_d_can;
break;
default:
ret = -EINVAL;
goto out_free_c_can;
}
priv->type = c_can_pci_data->type;
/* Configure access to registers */
switch (c_can_pci_data->reg_align) {
case C_CAN_REG_ALIGN_32:
priv->read_reg = c_can_pci_read_reg_aligned_to_32bit;
priv->write_reg = c_can_pci_write_reg_aligned_to_32bit;
break;
case C_CAN_REG_ALIGN_16:
priv->read_reg = c_can_pci_read_reg_aligned_to_16bit;
priv->write_reg = c_can_pci_write_reg_aligned_to_16bit;
break;
case C_CAN_REG_32:
priv->read_reg = c_can_pci_read_reg_32bit;
priv->write_reg = c_can_pci_write_reg_32bit;
break;
default:
ret = -EINVAL;
goto out_free_c_can;
}
priv->read_reg32 = c_can_pci_read_reg32;
priv->write_reg32 = c_can_pci_write_reg32;
priv->raminit = c_can_pci_data->init;
ret = register_c_can_dev(dev);
if (ret) {
dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
KBUILD_MODNAME, ret);
goto out_free_c_can;
}
dev_dbg(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
KBUILD_MODNAME, priv->regs, dev->irq);
return 0;
out_free_c_can:
free_c_can_dev(dev);
out_iounmap:
pci_iounmap(pdev, addr);
out_release_regions:
pci_disable_msi(pdev);
pci_clear_master(pdev);
pci_release_regions(pdev);
out_disable_device:
pci_disable_device(pdev);
out:
return ret;
}
static void c_can_pci_remove(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct c_can_priv *priv = netdev_priv(dev);
unregister_c_can_dev(dev);
free_c_can_dev(dev);
pci_iounmap(pdev, priv->base);
pci_disable_msi(pdev);
pci_clear_master(pdev);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static struct c_can_pci_data c_can_sta2x11= {
.type = BOSCH_C_CAN,
.reg_align = C_CAN_REG_ALIGN_32,
.freq = 52000000, /* 52 Mhz */
.bar = 0,
};
static struct c_can_pci_data c_can_pch = {
.type = BOSCH_C_CAN,
.reg_align = C_CAN_REG_32,
.freq = 50000000, /* 50 MHz */
.init = c_can_pci_reset_pch,
.bar = 1,
};
#define C_CAN_ID(_vend, _dev, _driverdata) { \
PCI_DEVICE(_vend, _dev), \
.driver_data = (unsigned long)&_driverdata, \
}
static const struct pci_device_id c_can_pci_tbl[] = {
C_CAN_ID(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_CAN,
c_can_sta2x11),
C_CAN_ID(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PCH_CAN,
c_can_pch),
{},
};
static struct pci_driver c_can_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = c_can_pci_tbl,
.probe = c_can_pci_probe,
.remove = c_can_pci_remove,
};
module_pci_driver(c_can_pci_driver);
MODULE_AUTHOR("Federico Vaga <federico.vaga@gmail.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PCI CAN bus driver for Bosch C_CAN/D_CAN controller");
MODULE_DEVICE_TABLE(pci, c_can_pci_tbl);
|