1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
4  *
5  * Parts of this software are based on (derived) the following:
6  *
7  * - Kvaser linux driver, version 4.72 BETA
8  *   Copyright (C) 2002-2007 KVASER AB
9  *
10  * - Lincan driver, version 0.3.3, OCERA project
11  *   Copyright (C) 2004 Pavel Pisa
12  *   Copyright (C) 2001 Arnaud Westenberg
13  *
14  * - Socketcan SJA1000 drivers
15  *   Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
16  *   Copyright (c) 2002-2007 Volkswagen Group Electronic Research
17  *   Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
18  *   38106 Braunschweig, GERMANY
19  */
20 
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/interrupt.h>
24 #include <linux/netdevice.h>
25 #include <linux/delay.h>
26 #include <linux/pci.h>
27 #include <linux/can/dev.h>
28 #include <linux/io.h>
29 
30 #include "sja1000.h"
31 
32 #define DRV_NAME  "kvaser_pci"
33 
34 MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
35 MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
36 MODULE_LICENSE("GPL v2");
37 
38 #define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */
39 
40 struct kvaser_pci {
41 	int channel;
42 	struct pci_dev *pci_dev;
43 	struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
44 	void __iomem *conf_addr;
45 	void __iomem *res_addr;
46 	int no_channels;
47 	u8 xilinx_ver;
48 };
49 
50 #define KVASER_PCI_CAN_CLOCK      (16000000 / 2)
51 
52 /*
53  * The board configuration is probably following:
54  * RX1 is connected to ground.
55  * TX1 is not connected.
56  * CLKO is not connected.
57  * Setting the OCR register to 0xDA is a good idea.
58  * This means  normal output mode , push-pull and the correct polarity.
59  */
60 #define KVASER_PCI_OCR            (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
61 
62 /*
63  * In the CDR register, you should set CBP to 1.
64  * You will probably also want to set the clock divider value to 0
65  * (meaning divide-by-2), the Pelican bit, and the clock-off bit
66  * (you will have no need for CLKOUT anyway).
67  */
68 #define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
69 
70 /*
71  * These register values are valid for revision 14 of the Xilinx logic.
72  */
73 #define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
74 					 high nibble version number. */
75 
76 #define XILINX_PRESUMED_VERSION   14
77 
78 /*
79  * Important S5920 registers
80  */
81 #define S5920_INTCSR              0x38
82 #define S5920_PTCR                0x60
83 #define INTCSR_ADDON_INTENABLE_M  0x2000
84 
85 
86 #define KVASER_PCI_PORT_BYTES     0x20
87 
88 #define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
89 #define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
90 #define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */
91 
92 #define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
93 #define KVASER_PCI_DEVICE_ID1     0x8406
94 
95 #define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
96 #define KVASER_PCI_DEVICE_ID2     0x0008
97 
98 static const struct pci_device_id kvaser_pci_tbl[] = {
99 	{KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
100 	{KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
101 	{ 0,}
102 };
103 
104 MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
105 
kvaser_pci_read_reg(const struct sja1000_priv * priv,int port)106 static u8 kvaser_pci_read_reg(const struct sja1000_priv *priv, int port)
107 {
108 	return ioread8(priv->reg_base + port);
109 }
110 
kvaser_pci_write_reg(const struct sja1000_priv * priv,int port,u8 val)111 static void kvaser_pci_write_reg(const struct sja1000_priv *priv,
112 				 int port, u8 val)
113 {
114 	iowrite8(val, priv->reg_base + port);
115 }
116 
kvaser_pci_disable_irq(struct net_device * dev)117 static void kvaser_pci_disable_irq(struct net_device *dev)
118 {
119 	struct sja1000_priv *priv = netdev_priv(dev);
120 	struct kvaser_pci *board = priv->priv;
121 	u32 intcsr;
122 
123 	/* Disable interrupts from card */
124 	intcsr = ioread32(board->conf_addr + S5920_INTCSR);
125 	intcsr &= ~INTCSR_ADDON_INTENABLE_M;
126 	iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
127 }
128 
kvaser_pci_enable_irq(struct net_device * dev)129 static void kvaser_pci_enable_irq(struct net_device *dev)
130 {
131 	struct sja1000_priv *priv = netdev_priv(dev);
132 	struct kvaser_pci *board = priv->priv;
133 	u32 tmp_en_io;
134 
135 	/* Enable interrupts from card */
136 	tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
137 	tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
138 	iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
139 }
140 
number_of_sja1000_chip(void __iomem * base_addr)141 static int number_of_sja1000_chip(void __iomem *base_addr)
142 {
143 	u8 status;
144 	int i;
145 
146 	for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
147 		/* reset chip */
148 		iowrite8(MOD_RM, base_addr +
149 			 (i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
150 		status = ioread8(base_addr +
151 				 (i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
152 		/* check reset bit */
153 		if (!(status & MOD_RM))
154 			break;
155 	}
156 
157 	return i;
158 }
159 
kvaser_pci_del_chan(struct net_device * dev)160 static void kvaser_pci_del_chan(struct net_device *dev)
161 {
162 	struct sja1000_priv *priv;
163 	struct kvaser_pci *board;
164 	int i;
165 
166 	if (!dev)
167 		return;
168 	priv = netdev_priv(dev);
169 	board = priv->priv;
170 	if (!board)
171 		return;
172 
173 	dev_info(&board->pci_dev->dev, "Removing device %s\n",
174 		 dev->name);
175 
176 	/* Disable PCI interrupts */
177 	kvaser_pci_disable_irq(dev);
178 
179 	for (i = 0; i < board->no_channels - 1; i++) {
180 		if (board->slave_dev[i]) {
181 			dev_info(&board->pci_dev->dev, "Removing device %s\n",
182 				 board->slave_dev[i]->name);
183 			unregister_sja1000dev(board->slave_dev[i]);
184 			free_sja1000dev(board->slave_dev[i]);
185 		}
186 	}
187 	unregister_sja1000dev(dev);
188 
189 	pci_iounmap(board->pci_dev, priv->reg_base);
190 	pci_iounmap(board->pci_dev, board->conf_addr);
191 	pci_iounmap(board->pci_dev, board->res_addr);
192 
193 	free_sja1000dev(dev);
194 }
195 
kvaser_pci_add_chan(struct pci_dev * pdev,int channel,struct net_device ** master_dev,void __iomem * conf_addr,void __iomem * res_addr,void __iomem * base_addr)196 static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
197 			       struct net_device **master_dev,
198 			       void __iomem *conf_addr,
199 			       void __iomem *res_addr,
200 			       void __iomem *base_addr)
201 {
202 	struct net_device *dev;
203 	struct sja1000_priv *priv;
204 	struct kvaser_pci *board;
205 	int err;
206 
207 	dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
208 	if (dev == NULL)
209 		return -ENOMEM;
210 
211 	priv = netdev_priv(dev);
212 	board = priv->priv;
213 
214 	board->pci_dev = pdev;
215 	board->channel = channel;
216 
217 	/* S5920 */
218 	board->conf_addr = conf_addr;
219 
220 	/* XILINX board wide address */
221 	board->res_addr = res_addr;
222 
223 	if (channel == 0) {
224 		board->xilinx_ver =
225 			ioread8(board->res_addr + XILINX_VERINT) >> 4;
226 
227 		/* Assert PTADR# - we're in passive mode so the other bits are
228 		   not important */
229 		iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
230 
231 		/* Enable interrupts from card */
232 		kvaser_pci_enable_irq(dev);
233 	} else {
234 		struct sja1000_priv *master_priv = netdev_priv(*master_dev);
235 		struct kvaser_pci *master_board = master_priv->priv;
236 		master_board->slave_dev[channel - 1] = dev;
237 		master_board->no_channels = channel + 1;
238 		board->xilinx_ver = master_board->xilinx_ver;
239 	}
240 
241 	priv->reg_base = base_addr + channel * KVASER_PCI_PORT_BYTES;
242 
243 	priv->read_reg = kvaser_pci_read_reg;
244 	priv->write_reg = kvaser_pci_write_reg;
245 
246 	priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
247 
248 	priv->ocr = KVASER_PCI_OCR;
249 	priv->cdr = KVASER_PCI_CDR;
250 
251 	priv->irq_flags = IRQF_SHARED;
252 	dev->irq = pdev->irq;
253 
254 	dev_info(&pdev->dev, "reg_base=%p conf_addr=%p irq=%d\n",
255 		 priv->reg_base, board->conf_addr, dev->irq);
256 
257 	SET_NETDEV_DEV(dev, &pdev->dev);
258 	dev->dev_id = channel;
259 
260 	/* Register SJA1000 device */
261 	err = register_sja1000dev(dev);
262 	if (err) {
263 		dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
264 			err);
265 		goto failure;
266 	}
267 
268 	if (channel == 0)
269 		*master_dev = dev;
270 
271 	return 0;
272 
273 failure:
274 	kvaser_pci_del_chan(dev);
275 	return err;
276 }
277 
kvaser_pci_init_one(struct pci_dev * pdev,const struct pci_device_id * ent)278 static int kvaser_pci_init_one(struct pci_dev *pdev,
279 			       const struct pci_device_id *ent)
280 {
281 	int err;
282 	struct net_device *master_dev = NULL;
283 	struct sja1000_priv *priv;
284 	struct kvaser_pci *board;
285 	int no_channels;
286 	void __iomem *base_addr = NULL;
287 	void __iomem *conf_addr = NULL;
288 	void __iomem *res_addr = NULL;
289 	int i;
290 
291 	dev_info(&pdev->dev, "initializing device %04x:%04x\n",
292 		 pdev->vendor, pdev->device);
293 
294 	err = pci_enable_device(pdev);
295 	if (err)
296 		goto failure;
297 
298 	err = pci_request_regions(pdev, DRV_NAME);
299 	if (err)
300 		goto failure_release_pci;
301 
302 	/* S5920 */
303 	conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
304 	if (conf_addr == NULL) {
305 		err = -ENODEV;
306 		goto failure_release_regions;
307 	}
308 
309 	/* XILINX board wide address */
310 	res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
311 	if (res_addr == NULL) {
312 		err = -ENOMEM;
313 		goto failure_iounmap;
314 	}
315 
316 	base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
317 	if (base_addr == NULL) {
318 		err = -ENOMEM;
319 		goto failure_iounmap;
320 	}
321 
322 	no_channels = number_of_sja1000_chip(base_addr);
323 	if (no_channels == 0) {
324 		err = -ENOMEM;
325 		goto failure_iounmap;
326 	}
327 
328 	for (i = 0; i < no_channels; i++) {
329 		err = kvaser_pci_add_chan(pdev, i, &master_dev,
330 					  conf_addr, res_addr,
331 					  base_addr);
332 		if (err)
333 			goto failure_cleanup;
334 	}
335 
336 	priv = netdev_priv(master_dev);
337 	board = priv->priv;
338 
339 	dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
340 		 board->xilinx_ver, board->no_channels);
341 
342 	pci_set_drvdata(pdev, master_dev);
343 	return 0;
344 
345 failure_cleanup:
346 	kvaser_pci_del_chan(master_dev);
347 
348 failure_iounmap:
349 	if (conf_addr != NULL)
350 		pci_iounmap(pdev, conf_addr);
351 	if (res_addr != NULL)
352 		pci_iounmap(pdev, res_addr);
353 	if (base_addr != NULL)
354 		pci_iounmap(pdev, base_addr);
355 
356 failure_release_regions:
357 	pci_release_regions(pdev);
358 
359 failure_release_pci:
360 	pci_disable_device(pdev);
361 
362 failure:
363 	return err;
364 
365 }
366 
kvaser_pci_remove_one(struct pci_dev * pdev)367 static void kvaser_pci_remove_one(struct pci_dev *pdev)
368 {
369 	struct net_device *dev = pci_get_drvdata(pdev);
370 
371 	kvaser_pci_del_chan(dev);
372 
373 	pci_release_regions(pdev);
374 	pci_disable_device(pdev);
375 }
376 
377 static struct pci_driver kvaser_pci_driver = {
378 	.name = DRV_NAME,
379 	.id_table = kvaser_pci_tbl,
380 	.probe = kvaser_pci_init_one,
381 	.remove = kvaser_pci_remove_one,
382 };
383 
384 module_pci_driver(kvaser_pci_driver);
385