xref: /linux/drivers/net/can/sja1000/kvaser_pci.c (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d)
1 /*
2  * Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
3  *
4  * Parts of this software are based on (derived) the following:
5  *
6  * - Kvaser linux driver, version 4.72 BETA
7  *   Copyright (C) 2002-2007 KVASER AB
8  *
9  * - Lincan driver, version 0.3.3, OCERA project
10  *   Copyright (C) 2004 Pavel Pisa
11  *   Copyright (C) 2001 Arnaud Westenberg
12  *
13  * - Socketcan SJA1000 drivers
14  *   Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
15  *   Copyright (c) 2002-2007 Volkswagen Group Electronic Research
16  *   Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
17  *   38106 Braunschweig, GERMANY
18  *
19  * This program is free software; you can redistribute it and/or modify
20  * it under the terms of the version 2 of the GNU General Public License
21  * as published by the Free Software Foundation
22  *
23  * This program is distributed in the hope that it will be useful, but
24  * WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
26  * General Public License for more details.
27  *
28  * You should have received a copy of the GNU General Public License
29  * along with this program; if not, write to the Free Software Foundation,
30  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31  */
32 
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/interrupt.h>
36 #include <linux/netdevice.h>
37 #include <linux/delay.h>
38 #include <linux/pci.h>
39 #include <linux/can/dev.h>
40 #include <linux/io.h>
41 
42 #include "sja1000.h"
43 
44 #define DRV_NAME  "kvaser_pci"
45 
46 MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
47 MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
48 MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
49 MODULE_LICENSE("GPL v2");
50 
51 #define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */
52 
53 struct kvaser_pci {
54 	int channel;
55 	struct pci_dev *pci_dev;
56 	struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
57 	void __iomem *conf_addr;
58 	void __iomem *res_addr;
59 	int no_channels;
60 	u8 xilinx_ver;
61 };
62 
63 #define KVASER_PCI_CAN_CLOCK      (16000000 / 2)
64 
65 /*
66  * The board configuration is probably following:
67  * RX1 is connected to ground.
68  * TX1 is not connected.
69  * CLKO is not connected.
70  * Setting the OCR register to 0xDA is a good idea.
71  * This means  normal output mode , push-pull and the correct polarity.
72  */
73 #define KVASER_PCI_OCR            (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
74 
75 /*
76  * In the CDR register, you should set CBP to 1.
77  * You will probably also want to set the clock divider value to 0
78  * (meaning divide-by-2), the Pelican bit, and the clock-off bit
79  * (you will have no need for CLKOUT anyway).
80  */
81 #define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
82 
83 /*
84  * These register values are valid for revision 14 of the Xilinx logic.
85  */
86 #define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
87 					 high nibble version number. */
88 
89 #define XILINX_PRESUMED_VERSION   14
90 
91 /*
92  * Important S5920 registers
93  */
94 #define S5920_INTCSR              0x38
95 #define S5920_PTCR                0x60
96 #define INTCSR_ADDON_INTENABLE_M  0x2000
97 
98 
99 #define KVASER_PCI_PORT_BYTES     0x20
100 
101 #define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
102 #define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
103 #define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */
104 
105 #define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
106 #define KVASER_PCI_DEVICE_ID1     0x8406
107 
108 #define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
109 #define KVASER_PCI_DEVICE_ID2     0x0008
110 
111 static DEFINE_PCI_DEVICE_TABLE(kvaser_pci_tbl) = {
112 	{KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
113 	{KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
114 	{ 0,}
115 };
116 
117 MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
118 
119 static u8 kvaser_pci_read_reg(const struct sja1000_priv *priv, int port)
120 {
121 	return ioread8(priv->reg_base + port);
122 }
123 
124 static void kvaser_pci_write_reg(const struct sja1000_priv *priv,
125 				 int port, u8 val)
126 {
127 	iowrite8(val, priv->reg_base + port);
128 }
129 
130 static void kvaser_pci_disable_irq(struct net_device *dev)
131 {
132 	struct sja1000_priv *priv = netdev_priv(dev);
133 	struct kvaser_pci *board = priv->priv;
134 	u32 intcsr;
135 
136 	/* Disable interrupts from card */
137 	intcsr = ioread32(board->conf_addr + S5920_INTCSR);
138 	intcsr &= ~INTCSR_ADDON_INTENABLE_M;
139 	iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
140 }
141 
142 static void kvaser_pci_enable_irq(struct net_device *dev)
143 {
144 	struct sja1000_priv *priv = netdev_priv(dev);
145 	struct kvaser_pci *board = priv->priv;
146 	u32 tmp_en_io;
147 
148 	/* Enable interrupts from card */
149 	tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
150 	tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
151 	iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
152 }
153 
154 static int number_of_sja1000_chip(void __iomem *base_addr)
155 {
156 	u8 status;
157 	int i;
158 
159 	for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
160 		/* reset chip */
161 		iowrite8(MOD_RM, base_addr +
162 			 (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
163 		status = ioread8(base_addr +
164 				 (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
165 		/* check reset bit */
166 		if (!(status & MOD_RM))
167 			break;
168 	}
169 
170 	return i;
171 }
172 
173 static void kvaser_pci_del_chan(struct net_device *dev)
174 {
175 	struct sja1000_priv *priv;
176 	struct kvaser_pci *board;
177 	int i;
178 
179 	if (!dev)
180 		return;
181 	priv = netdev_priv(dev);
182 	board = priv->priv;
183 	if (!board)
184 		return;
185 
186 	dev_info(&board->pci_dev->dev, "Removing device %s\n",
187 		 dev->name);
188 
189 	/* Disable PCI interrupts */
190 	kvaser_pci_disable_irq(dev);
191 
192 	for (i = 0; i < board->no_channels - 1; i++) {
193 		if (board->slave_dev[i]) {
194 			dev_info(&board->pci_dev->dev, "Removing device %s\n",
195 				 board->slave_dev[i]->name);
196 			unregister_sja1000dev(board->slave_dev[i]);
197 			free_sja1000dev(board->slave_dev[i]);
198 		}
199 	}
200 	unregister_sja1000dev(dev);
201 
202 	pci_iounmap(board->pci_dev, priv->reg_base);
203 	pci_iounmap(board->pci_dev, board->conf_addr);
204 	pci_iounmap(board->pci_dev, board->res_addr);
205 
206 	free_sja1000dev(dev);
207 }
208 
209 static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
210 			       struct net_device **master_dev,
211 			       void __iomem *conf_addr,
212 			       void __iomem *res_addr,
213 			       void __iomem *base_addr)
214 {
215 	struct net_device *dev;
216 	struct sja1000_priv *priv;
217 	struct kvaser_pci *board;
218 	int err, init_step;
219 
220 	dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
221 	if (dev == NULL)
222 		return -ENOMEM;
223 
224 	priv = netdev_priv(dev);
225 	board = priv->priv;
226 
227 	board->pci_dev = pdev;
228 	board->channel = channel;
229 
230 	/* S5920 */
231 	board->conf_addr = conf_addr;
232 
233 	/* XILINX board wide address */
234 	board->res_addr = res_addr;
235 
236 	if (channel == 0) {
237 		board->xilinx_ver =
238 			ioread8(board->res_addr + XILINX_VERINT) >> 4;
239 		init_step = 2;
240 
241 		/* Assert PTADR# - we're in passive mode so the other bits are
242 		   not important */
243 		iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
244 
245 		/* Enable interrupts from card */
246 		kvaser_pci_enable_irq(dev);
247 	} else {
248 		struct sja1000_priv *master_priv = netdev_priv(*master_dev);
249 		struct kvaser_pci *master_board = master_priv->priv;
250 		master_board->slave_dev[channel - 1] = dev;
251 		master_board->no_channels = channel + 1;
252 		board->xilinx_ver = master_board->xilinx_ver;
253 	}
254 
255 	priv->reg_base = base_addr + channel * KVASER_PCI_PORT_BYTES;
256 
257 	priv->read_reg = kvaser_pci_read_reg;
258 	priv->write_reg = kvaser_pci_write_reg;
259 
260 	priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
261 
262 	priv->ocr = KVASER_PCI_OCR;
263 	priv->cdr = KVASER_PCI_CDR;
264 
265 	priv->irq_flags = IRQF_SHARED;
266 	dev->irq = pdev->irq;
267 
268 	init_step = 4;
269 
270 	dev_info(&pdev->dev, "reg_base=%p conf_addr=%p irq=%d\n",
271 		 priv->reg_base, board->conf_addr, dev->irq);
272 
273 	SET_NETDEV_DEV(dev, &pdev->dev);
274 
275 	/* Register SJA1000 device */
276 	err = register_sja1000dev(dev);
277 	if (err) {
278 		dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
279 			err);
280 		goto failure;
281 	}
282 
283 	if (channel == 0)
284 		*master_dev = dev;
285 
286 	return 0;
287 
288 failure:
289 	kvaser_pci_del_chan(dev);
290 	return err;
291 }
292 
293 static int __devinit kvaser_pci_init_one(struct pci_dev *pdev,
294 					 const struct pci_device_id *ent)
295 {
296 	int err;
297 	struct net_device *master_dev = NULL;
298 	struct sja1000_priv *priv;
299 	struct kvaser_pci *board;
300 	int no_channels;
301 	void __iomem *base_addr = NULL;
302 	void __iomem *conf_addr = NULL;
303 	void __iomem *res_addr = NULL;
304 	int i;
305 
306 	dev_info(&pdev->dev, "initializing device %04x:%04x\n",
307 		 pdev->vendor, pdev->device);
308 
309 	err = pci_enable_device(pdev);
310 	if (err)
311 		goto failure;
312 
313 	err = pci_request_regions(pdev, DRV_NAME);
314 	if (err)
315 		goto failure_release_pci;
316 
317 	/* S5920 */
318 	conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
319 	if (conf_addr == NULL) {
320 		err = -ENODEV;
321 		goto failure_release_regions;
322 	}
323 
324 	/* XILINX board wide address */
325 	res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
326 	if (res_addr == NULL) {
327 		err = -ENOMEM;
328 		goto failure_iounmap;
329 	}
330 
331 	base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
332 	if (base_addr == NULL) {
333 		err = -ENOMEM;
334 		goto failure_iounmap;
335 	}
336 
337 	no_channels = number_of_sja1000_chip(base_addr);
338 	if (no_channels == 0) {
339 		err = -ENOMEM;
340 		goto failure_iounmap;
341 	}
342 
343 	for (i = 0; i < no_channels; i++) {
344 		err = kvaser_pci_add_chan(pdev, i, &master_dev,
345 					  conf_addr, res_addr,
346 					  base_addr);
347 		if (err)
348 			goto failure_cleanup;
349 	}
350 
351 	priv = netdev_priv(master_dev);
352 	board = priv->priv;
353 
354 	dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
355 		 board->xilinx_ver, board->no_channels);
356 
357 	pci_set_drvdata(pdev, master_dev);
358 	return 0;
359 
360 failure_cleanup:
361 	kvaser_pci_del_chan(master_dev);
362 
363 failure_iounmap:
364 	if (conf_addr != NULL)
365 		pci_iounmap(pdev, conf_addr);
366 	if (res_addr != NULL)
367 		pci_iounmap(pdev, res_addr);
368 	if (base_addr != NULL)
369 		pci_iounmap(pdev, base_addr);
370 
371 failure_release_regions:
372 	pci_release_regions(pdev);
373 
374 failure_release_pci:
375 	pci_disable_device(pdev);
376 
377 failure:
378 	return err;
379 
380 }
381 
382 static void __devexit kvaser_pci_remove_one(struct pci_dev *pdev)
383 {
384 	struct net_device *dev = pci_get_drvdata(pdev);
385 
386 	kvaser_pci_del_chan(dev);
387 
388 	pci_release_regions(pdev);
389 	pci_disable_device(pdev);
390 	pci_set_drvdata(pdev, NULL);
391 }
392 
393 static struct pci_driver kvaser_pci_driver = {
394 	.name = DRV_NAME,
395 	.id_table = kvaser_pci_tbl,
396 	.probe = kvaser_pci_init_one,
397 	.remove = __devexit_p(kvaser_pci_remove_one),
398 };
399 
400 module_pci_driver(kvaser_pci_driver);
401