aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/can/sja1000/peak_pci.c
blob: 2c7f5036f570fd70d1078c1fabef3b7336d2d89e (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
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
/*
 * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
 *
 * Derived from the PCAN project file driver/src/pcan_pci.c:
 *
 * Copyright (C) 2001-2006  PEAK System-Technik GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/can.h>
#include <linux/can/dev.h>

#include "sja1000.h"

MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI/PCIe cards");
MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe CAN card");
MODULE_LICENSE("GPL v2");

#define DRV_NAME  "peak_pci"

struct peak_pci_chan {
	void __iomem *cfg_base;	     /* Common for all channels */
	struct net_device *next_dev; /* Chain of network devices */
	u16 icr_mask;		     /* Interrupt mask for fast ack */
};

#define PEAK_PCI_CAN_CLOCK	(16000000 / 2)

#define PEAK_PCI_CDR		(CDR_CBP | CDR_CLKOUT_MASK)
#define PEAK_PCI_OCR		OCR_TX0_PUSHPULL

/*
 * Important PITA registers
 */
#define PITA_ICR		0x00	/* Interrupt control register */
#define PITA_GPIOICR		0x18	/* GPIO interface control register */
#define PITA_MISC		0x1C	/* Miscellaneous register */

#define PEAK_PCI_CFG_SIZE	0x1000	/* Size of the config PCI bar */
#define PEAK_PCI_CHAN_SIZE	0x0400	/* Size used by the channel */

#define PEAK_PCI_VENDOR_ID	0x001C	/* The PCI device and vendor IDs */
#define PEAK_PCI_DEVICE_ID	0x0001	/* for PCI/PCIe slot cards */

static const u16 peak_pci_icr_masks[] = {0x02, 0x01, 0x40, 0x80};

static DEFINE_PCI_DEVICE_TABLE(peak_pci_tbl) = {
	{PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
	{0,}
};

MODULE_DEVICE_TABLE(pci, peak_pci_tbl);

static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
{
	return readb(priv->reg_base + (port << 2));
}

static void peak_pci_write_reg(const struct sja1000_priv *priv,
			       int port, u8 val)
{
	writeb(val, priv->reg_base + (port << 2));
}

static void peak_pci_post_irq(const struct sja1000_priv *priv)
{
	struct peak_pci_chan *chan = priv->priv;
	u16 icr;

	/* Select and clear in PITA stored interrupt */
	icr = readw(chan->cfg_base + PITA_ICR);
	if (icr & chan->icr_mask)
		writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
}

static int __devinit peak_pci_probe(struct pci_dev *pdev,
				    const struct pci_device_id *ent)
{
	struct sja1000_priv *priv;
	struct peak_pci_chan *chan;
	struct net_device *dev, *dev0 = NULL;
	void __iomem *cfg_base, *reg_base;
	u16 sub_sys_id, icr;
	int i, err, channels;

	err = pci_enable_device(pdev);
	if (err)
		return err;

	err = pci_request_regions(pdev, DRV_NAME);
	if (err)
		goto failure_disable_pci;

	err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
	if (err)
		goto failure_release_regions;

	dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
		pdev->vendor, pdev->device, sub_sys_id);

	err = pci_write_config_word(pdev, 0x44, 0);
	if (err)
		goto failure_release_regions;

	if (sub_sys_id >= 12)
		channels = 4;
	else if (sub_sys_id >= 10)
		channels = 3;
	else if (sub_sys_id >= 4)
		channels = 2;
	else
		channels = 1;

	cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
	if (!cfg_base) {
		dev_err(&pdev->dev, "failed to map PCI resource #0\n");
		goto failure_release_regions;
	}

	reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
	if (!reg_base) {
		dev_err(&pdev->dev, "failed to map PCI resource #1\n");
		goto failure_unmap_cfg_base;
	}

	/* Set GPIO control register */
	writew(0x0005, cfg_base + PITA_GPIOICR + 2);
	/* Enable all channels of this card */
	writeb(0x00, cfg_base + PITA_GPIOICR);
	/* Toggle reset */
	writeb(0x05, cfg_base + PITA_MISC + 3);
	mdelay(5);
	/* Leave parport mux mode */
	writeb(0x04, cfg_base + PITA_MISC + 3);

	icr = readw(cfg_base + PITA_ICR + 2);

	for (i = 0; i < channels; i++) {
		dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
		if (!dev) {
			err = -ENOMEM;
			goto failure_remove_channels;
		}

		priv = netdev_priv(dev);
		chan = priv->priv;

		chan->cfg_base = cfg_base;
		priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;

		priv->read_reg = peak_pci_read_reg;
		priv->write_reg = peak_pci_write_reg;
		priv->post_irq = peak_pci_post_irq;

		priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
		priv->ocr = PEAK_PCI_OCR;
		priv->cdr = PEAK_PCI_CDR;
		/* Neither a slave nor a single device distributes the clock */
		if (channels == 1 || i > 0)
			priv->cdr |= CDR_CLK_OFF;

		/* Setup interrupt handling */
		priv->irq_flags = IRQF_SHARED;
		dev->irq = pdev->irq;

		chan->icr_mask = peak_pci_icr_masks[i];
		icr |= chan->icr_mask;

		SET_NETDEV_DEV(dev, &pdev->dev);

		err = register_sja1000dev(dev);
		if (err) {
			dev_err(&pdev->dev, "failed to register device\n");
			free_sja1000dev(dev);
			goto failure_remove_channels;
		}

		/* Create chain of SJA1000 devices */
		if (i == 0)
			dev0 = dev;
		else
			chan->next_dev = dev;

		dev_info(&pdev->dev,
			 "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
			 dev->name, priv->reg_base, chan->cfg_base, dev->irq);
	}

	pci_set_drvdata(pdev, dev0);

	/* Enable interrupts */
	writew(icr, cfg_base + PITA_ICR + 2);

	return 0;

failure_remove_channels:
	/* Disable interrupts */
	writew(0x0, cfg_base + PITA_ICR + 2);

	for (dev = dev0; dev; dev = chan->next_dev) {
		unregister_sja1000dev(dev);
		free_sja1000dev(dev);
		priv = netdev_priv(dev);
		chan = priv->priv;
		dev = chan->next_dev;
	}

	pci_iounmap(pdev, reg_base);

failure_unmap_cfg_base:
	pci_iounmap(pdev, cfg_base);

failure_release_regions:
	pci_release_regions(pdev);

failure_disable_pci:
	pci_disable_device(pdev);

	return err;
}

static void __devexit peak_pci_remove(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev); /* First device */
	struct sja1000_priv *priv = netdev_priv(dev);
	struct peak_pci_chan *chan = priv->priv;
	void __iomem *cfg_base = chan->cfg_base;
	void __iomem *reg_base = priv->reg_base;

	/* Disable interrupts */
	writew(0x0, cfg_base + PITA_ICR + 2);

	/* Loop over all registered devices */
	while (1) {
		dev_info(&pdev->dev, "removing device %s\n", dev->name);
		unregister_sja1000dev(dev);
		free_sja1000dev(dev);
		dev = chan->next_dev;
		if (!dev)
			break;
		priv = netdev_priv(dev);
		chan = priv->priv;
	}

	pci_iounmap(pdev, reg_base);
	pci_iounmap(pdev, cfg_base);
	pci_release_regions(pdev);
	pci_disable_device(pdev);

	pci_set_drvdata(pdev, NULL);
}

static struct pci_driver peak_pci_driver = {
	.name = DRV_NAME,
	.id_table = peak_pci_tbl,
	.probe = peak_pci_probe,
	.remove = __devexit_p(peak_pci_remove),
};

static int __init peak_pci_init(void)
{
	return pci_register_driver(&peak_pci_driver);
}
module_init(peak_pci_init);

static void __exit peak_pci_exit(void)
{
	pci_unregister_driver(&peak_pci_driver);
}
module_exit(peak_pci_exit);