1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2008-2010 Pavel Cheblakov <P.B.Cheblakov@inp.nsk.su>
4  *
5  * Derived from the ems_pci.c driver:
6  *	Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
7  *	Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com>
8  *	Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.com>
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/netdevice.h>
15 #include <linux/delay.h>
16 #include <linux/slab.h>
17 #include <linux/pci.h>
18 #include <linux/can/dev.h>
19 #include <linux/io.h>
20 
21 #include "sja1000.h"
22 
23 #define DRV_NAME  "sja1000_plx_pci"
24 
25 MODULE_AUTHOR("Pavel Cheblakov <P.B.Cheblakov@inp.nsk.su>");
26 MODULE_DESCRIPTION("Socket-CAN driver for PLX90xx PCI-bridge cards with "
27 		   "the SJA1000 chips");
28 MODULE_LICENSE("GPL v2");
29 
30 #define PLX_PCI_MAX_CHAN 2
31 
32 struct plx_pci_card {
33 	int channels;			/* detected channels count */
34 	struct net_device *net_dev[PLX_PCI_MAX_CHAN];
35 	void __iomem *conf_addr;
36 
37 	/* Pointer to device-dependent reset function */
38 	void (*reset_func)(struct pci_dev *pdev);
39 };
40 
41 #define PLX_PCI_CAN_CLOCK (16000000 / 2)
42 
43 /* PLX9030/9050/9052 registers */
44 #define PLX_INTCSR	0x4c		/* Interrupt Control/Status */
45 #define PLX_CNTRL	0x50		/* User I/O, Direct Slave Response,
46 					 * Serial EEPROM, and Initialization
47 					 * Control register
48 					 */
49 
50 #define PLX_LINT1_EN	0x1		/* Local interrupt 1 enable */
51 #define PLX_LINT1_POL	(1 << 1)	/* Local interrupt 1 polarity */
52 #define PLX_LINT2_EN	(1 << 3)	/* Local interrupt 2 enable */
53 #define PLX_LINT2_POL	(1 << 4)	/* Local interrupt 2 polarity */
54 #define PLX_PCI_INT_EN	(1 << 6)	/* PCI Interrupt Enable */
55 #define PLX_PCI_RESET	(1 << 30)	/* PCI Adapter Software Reset */
56 
57 /* PLX9056 registers */
58 #define PLX9056_INTCSR	0x68		/* Interrupt Control/Status */
59 #define PLX9056_CNTRL	0x6c		/* Control / Software Reset */
60 
61 #define PLX9056_LINTI	(1 << 11)
62 #define PLX9056_PCI_INT_EN (1 << 8)
63 #define PLX9056_PCI_RCR	(1 << 29)	/* Read Configuration Registers */
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 PLX_PCI_OCR	(OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
74 
75 /* OCR setting for ASEM Dual CAN raw */
76 #define ASEM_PCI_OCR	0xfe
77 
78 /*
79  * In the CDR register, you should set CBP to 1.
80  * You will probably also want to set the clock divider value to 7
81  * (meaning direct oscillator output) because the second SJA1000 chip
82  * is driven by the first one CLKOUT output.
83  */
84 #define PLX_PCI_CDR			(CDR_CBP | CDR_CLKOUT_MASK)
85 
86 /* SJA1000 Control Register in the BasicCAN Mode */
87 #define REG_CR				0x00
88 
89 /* States of some SJA1000 registers after hardware reset in the BasicCAN mode*/
90 #define REG_CR_BASICCAN_INITIAL		0x21
91 #define REG_CR_BASICCAN_INITIAL_MASK	0xa1
92 #define REG_SR_BASICCAN_INITIAL		0x0c
93 #define REG_IR_BASICCAN_INITIAL		0xe0
94 
95 /* States of some SJA1000 registers after hardware reset in the PeliCAN mode*/
96 #define REG_MOD_PELICAN_INITIAL		0x01
97 #define REG_SR_PELICAN_INITIAL		0x3c
98 #define REG_IR_PELICAN_INITIAL		0x00
99 
100 #define ADLINK_PCI_VENDOR_ID		0x144A
101 #define ADLINK_PCI_DEVICE_ID		0x7841
102 
103 #define ESD_PCI_SUB_SYS_ID_PCI200	0x0004
104 #define ESD_PCI_SUB_SYS_ID_PCI266	0x0009
105 #define ESD_PCI_SUB_SYS_ID_PMC266	0x000e
106 #define ESD_PCI_SUB_SYS_ID_CPCI200	0x010b
107 #define ESD_PCI_SUB_SYS_ID_PCIE2000	0x0200
108 #define ESD_PCI_SUB_SYS_ID_PCI104200	0x0501
109 
110 #define CAN200PCI_DEVICE_ID		0x9030
111 #define CAN200PCI_VENDOR_ID		0x10b5
112 #define CAN200PCI_SUB_DEVICE_ID		0x0301
113 #define CAN200PCI_SUB_VENDOR_ID		0xe1c5
114 
115 #define IXXAT_PCI_VENDOR_ID		0x10b5
116 #define IXXAT_PCI_DEVICE_ID		0x9050
117 #define IXXAT_PCI_SUB_SYS_ID		0x2540
118 
119 #define MARATHON_PCI_DEVICE_ID		0x2715
120 #define MARATHON_PCIE_DEVICE_ID		0x3432
121 
122 #define TEWS_PCI_VENDOR_ID		0x1498
123 #define TEWS_PCI_DEVICE_ID_TMPC810	0x032A
124 
125 #define CTI_PCI_VENDOR_ID		0x12c4
126 #define CTI_PCI_DEVICE_ID_CRG001	0x0900
127 
128 #define MOXA_PCI_VENDOR_ID		0x1393
129 #define MOXA_PCI_DEVICE_ID		0x0100
130 
131 #define ASEM_RAW_CAN_VENDOR_ID		0x10b5
132 #define ASEM_RAW_CAN_DEVICE_ID		0x9030
133 #define ASEM_RAW_CAN_SUB_VENDOR_ID	0x3000
134 #define ASEM_RAW_CAN_SUB_DEVICE_ID	0x1001
135 #define ASEM_RAW_CAN_SUB_DEVICE_ID_BIS	0x1002
136 #define ASEM_RAW_CAN_RST_REGISTER	0x54
137 #define ASEM_RAW_CAN_RST_MASK_CAN1	0x20
138 #define ASEM_RAW_CAN_RST_MASK_CAN2	0x04
139 
140 static void plx_pci_reset_common(struct pci_dev *pdev);
141 static void plx9056_pci_reset_common(struct pci_dev *pdev);
142 static void plx_pci_reset_marathon_pci(struct pci_dev *pdev);
143 static void plx_pci_reset_marathon_pcie(struct pci_dev *pdev);
144 static void plx_pci_reset_asem_dual_can_raw(struct pci_dev *pdev);
145 
146 struct plx_pci_channel_map {
147 	u32 bar;
148 	u32 offset;
149 	u32 size;		/* 0x00 - auto, e.g. length of entire bar */
150 };
151 
152 struct plx_pci_card_info {
153 	const char *name;
154 	int channel_count;
155 	u32 can_clock;
156 	u8 ocr;			/* output control register */
157 	u8 cdr;			/* clock divider register */
158 
159 	/* Parameters for mapping local configuration space */
160 	struct plx_pci_channel_map conf_map;
161 
162 	/* Parameters for mapping the SJA1000 chips */
163 	struct plx_pci_channel_map chan_map_tbl[PLX_PCI_MAX_CHAN];
164 
165 	/* Pointer to device-dependent reset function */
166 	void (*reset_func)(struct pci_dev *pdev);
167 };
168 
169 static struct plx_pci_card_info plx_pci_card_info_adlink = {
170 	"Adlink PCI-7841/cPCI-7841", 2,
171 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
172 	{1, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x80, 0x80} },
173 	&plx_pci_reset_common
174 	/* based on PLX9052 */
175 };
176 
177 static struct plx_pci_card_info plx_pci_card_info_adlink_se = {
178 	"Adlink PCI-7841/cPCI-7841 SE", 2,
179 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
180 	{0, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x80, 0x80} },
181 	&plx_pci_reset_common
182 	/* based on PLX9052 */
183 };
184 
185 static struct plx_pci_card_info plx_pci_card_info_esd200 = {
186 	"esd CAN-PCI/CPCI/PCI104/200", 2,
187 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
188 	{0, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x100, 0x80} },
189 	&plx_pci_reset_common
190 	/* based on PLX9030/9050 */
191 };
192 
193 static struct plx_pci_card_info plx_pci_card_info_esd266 = {
194 	"esd CAN-PCI/PMC/266", 2,
195 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
196 	{0, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x100, 0x80} },
197 	&plx9056_pci_reset_common
198 	/* based on PLX9056 */
199 };
200 
201 static struct plx_pci_card_info plx_pci_card_info_esd2000 = {
202 	"esd CAN-PCIe/2000", 2,
203 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
204 	{0, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x100, 0x80} },
205 	&plx9056_pci_reset_common
206 	/* based on PEX8311 */
207 };
208 
209 static struct plx_pci_card_info plx_pci_card_info_ixxat = {
210 	"IXXAT PC-I 04/PCI", 2,
211 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
212 	{0, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x200, 0x80} },
213 	&plx_pci_reset_common
214 	/* based on PLX9050 */
215 };
216 
217 static struct plx_pci_card_info plx_pci_card_info_marathon_pci = {
218 	"Marathon CAN-bus-PCI", 2,
219 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
220 	{0, 0x00, 0x00}, { {2, 0x00, 0x00}, {4, 0x00, 0x00} },
221 	&plx_pci_reset_marathon_pci
222 	/* based on PLX9052 */
223 };
224 
225 static struct plx_pci_card_info plx_pci_card_info_marathon_pcie = {
226 	"Marathon CAN-bus-PCIe", 2,
227 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
228 	{0, 0x00, 0x00}, { {2, 0x00, 0x00}, {3, 0x80, 0x00} },
229 	&plx_pci_reset_marathon_pcie
230 	/* based on PEX8311 */
231 };
232 
233 static struct plx_pci_card_info plx_pci_card_info_tews = {
234 	"TEWS TECHNOLOGIES TPMC810", 2,
235 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
236 	{0, 0x00, 0x00}, { {2, 0x000, 0x80}, {2, 0x100, 0x80} },
237 	&plx_pci_reset_common
238 	/* based on PLX9030 */
239 };
240 
241 static struct plx_pci_card_info plx_pci_card_info_cti = {
242 	"Connect Tech Inc. CANpro/104-Plus Opto (CRG001)", 2,
243 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
244 	{0, 0x00, 0x00}, { {2, 0x000, 0x80}, {2, 0x100, 0x80} },
245 	&plx_pci_reset_common
246 	/* based on PLX9030 */
247 };
248 
249 static struct plx_pci_card_info plx_pci_card_info_elcus = {
250 	"Eclus CAN-200-PCI", 2,
251 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
252 	{1, 0x00, 0x00}, { {2, 0x00, 0x80}, {3, 0x00, 0x80} },
253 	&plx_pci_reset_common
254 	/* based on PLX9030 */
255 };
256 
257 static struct plx_pci_card_info plx_pci_card_info_moxa = {
258 	"MOXA", 2,
259 	PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
260 	{0, 0x00, 0x00}, { {0, 0x00, 0x80}, {1, 0x00, 0x80} },
261 	&plx_pci_reset_common
262 	 /* based on PLX9052 */
263 };
264 
265 static struct plx_pci_card_info plx_pci_card_info_asem_dual_can = {
266 	"ASEM Dual CAN raw PCI", 2,
267 	PLX_PCI_CAN_CLOCK, ASEM_PCI_OCR, PLX_PCI_CDR,
268 	{0, 0x00, 0x00}, { {2, 0x00, 0x00}, {4, 0x00, 0x00} },
269 	&plx_pci_reset_asem_dual_can_raw
270 	/* based on PLX9030 */
271 };
272 
273 static const struct pci_device_id plx_pci_tbl[] = {
274 	{
275 		/* Adlink PCI-7841/cPCI-7841 */
276 		ADLINK_PCI_VENDOR_ID, ADLINK_PCI_DEVICE_ID,
277 		PCI_ANY_ID, PCI_ANY_ID,
278 		PCI_CLASS_NETWORK_OTHER << 8, ~0,
279 		(kernel_ulong_t)&plx_pci_card_info_adlink
280 	},
281 	{
282 		/* Adlink PCI-7841/cPCI-7841 SE */
283 		ADLINK_PCI_VENDOR_ID, ADLINK_PCI_DEVICE_ID,
284 		PCI_ANY_ID, PCI_ANY_ID,
285 		PCI_CLASS_COMMUNICATION_OTHER << 8, ~0,
286 		(kernel_ulong_t)&plx_pci_card_info_adlink_se
287 	},
288 	{
289 		/* esd CAN-PCI/200 */
290 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
291 		PCI_VENDOR_ID_ESDGMBH, ESD_PCI_SUB_SYS_ID_PCI200,
292 		0, 0,
293 		(kernel_ulong_t)&plx_pci_card_info_esd200
294 	},
295 	{
296 		/* esd CAN-CPCI/200 */
297 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
298 		PCI_VENDOR_ID_ESDGMBH, ESD_PCI_SUB_SYS_ID_CPCI200,
299 		0, 0,
300 		(kernel_ulong_t)&plx_pci_card_info_esd200
301 	},
302 	{
303 		/* esd CAN-PCI104/200 */
304 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
305 		PCI_VENDOR_ID_ESDGMBH, ESD_PCI_SUB_SYS_ID_PCI104200,
306 		0, 0,
307 		(kernel_ulong_t)&plx_pci_card_info_esd200
308 	},
309 	{
310 		/* esd CAN-PCI/266 */
311 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9056,
312 		PCI_VENDOR_ID_ESDGMBH, ESD_PCI_SUB_SYS_ID_PCI266,
313 		0, 0,
314 		(kernel_ulong_t)&plx_pci_card_info_esd266
315 	},
316 	{
317 		/* esd CAN-PMC/266 */
318 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9056,
319 		PCI_VENDOR_ID_ESDGMBH, ESD_PCI_SUB_SYS_ID_PMC266,
320 		0, 0,
321 		(kernel_ulong_t)&plx_pci_card_info_esd266
322 	},
323 	{
324 		/* esd CAN-PCIE/2000 */
325 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9056,
326 		PCI_VENDOR_ID_ESDGMBH, ESD_PCI_SUB_SYS_ID_PCIE2000,
327 		0, 0,
328 		(kernel_ulong_t)&plx_pci_card_info_esd2000
329 	},
330 	{
331 		/* IXXAT PC-I 04/PCI card */
332 		IXXAT_PCI_VENDOR_ID, IXXAT_PCI_DEVICE_ID,
333 		PCI_ANY_ID, IXXAT_PCI_SUB_SYS_ID,
334 		0, 0,
335 		(kernel_ulong_t)&plx_pci_card_info_ixxat
336 	},
337 	{
338 		/* Marathon CAN-bus-PCI card */
339 		PCI_VENDOR_ID_PLX, MARATHON_PCI_DEVICE_ID,
340 		PCI_ANY_ID, PCI_ANY_ID,
341 		0, 0,
342 		(kernel_ulong_t)&plx_pci_card_info_marathon_pci
343 	},
344 	{
345 		/* Marathon CAN-bus-PCIe card */
346 		PCI_VENDOR_ID_PLX, MARATHON_PCIE_DEVICE_ID,
347 		PCI_ANY_ID, PCI_ANY_ID,
348 		0, 0,
349 		(kernel_ulong_t)&plx_pci_card_info_marathon_pcie
350 	},
351 	{
352 		/* TEWS TECHNOLOGIES TPMC810 card */
353 		TEWS_PCI_VENDOR_ID, TEWS_PCI_DEVICE_ID_TMPC810,
354 		PCI_ANY_ID, PCI_ANY_ID,
355 		0, 0,
356 		(kernel_ulong_t)&plx_pci_card_info_tews
357 	},
358 	{
359 		/* Connect Tech Inc. CANpro/104-Plus Opto (CRG001) card */
360 		PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
361 		CTI_PCI_VENDOR_ID, CTI_PCI_DEVICE_ID_CRG001,
362 		0, 0,
363 		(kernel_ulong_t)&plx_pci_card_info_cti
364 	},
365 	{
366 		/* Elcus CAN-200-PCI */
367 		CAN200PCI_VENDOR_ID, CAN200PCI_DEVICE_ID,
368 		CAN200PCI_SUB_VENDOR_ID, CAN200PCI_SUB_DEVICE_ID,
369 		0, 0,
370 		(kernel_ulong_t)&plx_pci_card_info_elcus
371 	},
372 	{
373 		/* moxa */
374 		MOXA_PCI_VENDOR_ID, MOXA_PCI_DEVICE_ID,
375 		PCI_ANY_ID, PCI_ANY_ID,
376 		0, 0,
377 		(kernel_ulong_t)&plx_pci_card_info_moxa
378 	},
379 	{
380 		/* ASEM Dual CAN raw */
381 		ASEM_RAW_CAN_VENDOR_ID, ASEM_RAW_CAN_DEVICE_ID,
382 		ASEM_RAW_CAN_SUB_VENDOR_ID, ASEM_RAW_CAN_SUB_DEVICE_ID,
383 		0, 0,
384 		(kernel_ulong_t)&plx_pci_card_info_asem_dual_can
385 	},
386 	{
387 		/* ASEM Dual CAN raw -new model */
388 		ASEM_RAW_CAN_VENDOR_ID, ASEM_RAW_CAN_DEVICE_ID,
389 		ASEM_RAW_CAN_SUB_VENDOR_ID, ASEM_RAW_CAN_SUB_DEVICE_ID_BIS,
390 		0, 0,
391 		(kernel_ulong_t)&plx_pci_card_info_asem_dual_can
392 	},
393 	{ 0,}
394 };
395 MODULE_DEVICE_TABLE(pci, plx_pci_tbl);
396 
plx_pci_read_reg(const struct sja1000_priv * priv,int port)397 static u8 plx_pci_read_reg(const struct sja1000_priv *priv, int port)
398 {
399 	return ioread8(priv->reg_base + port);
400 }
401 
plx_pci_write_reg(const struct sja1000_priv * priv,int port,u8 val)402 static void plx_pci_write_reg(const struct sja1000_priv *priv, int port, u8 val)
403 {
404 	iowrite8(val, priv->reg_base + port);
405 }
406 
407 /*
408  * Check if a CAN controller is present at the specified location
409  * by trying to switch 'em from the Basic mode into the PeliCAN mode.
410  * Also check states of some registers in reset mode.
411  */
plx_pci_check_sja1000(const struct sja1000_priv * priv)412 static inline int plx_pci_check_sja1000(const struct sja1000_priv *priv)
413 {
414 	int flag = 0;
415 
416 	/*
417 	 * Check registers after hardware reset (the Basic mode)
418 	 * See states on p. 10 of the Datasheet.
419 	 */
420 	if ((priv->read_reg(priv, REG_CR) & REG_CR_BASICCAN_INITIAL_MASK) ==
421 	    REG_CR_BASICCAN_INITIAL &&
422 	    (priv->read_reg(priv, SJA1000_SR) == REG_SR_BASICCAN_INITIAL) &&
423 	    (priv->read_reg(priv, SJA1000_IR) == REG_IR_BASICCAN_INITIAL))
424 		flag = 1;
425 
426 	/* Bring the SJA1000 into the PeliCAN mode*/
427 	priv->write_reg(priv, SJA1000_CDR, CDR_PELICAN);
428 
429 	/*
430 	 * Check registers after reset in the PeliCAN mode.
431 	 * See states on p. 23 of the Datasheet.
432 	 */
433 	if (priv->read_reg(priv, SJA1000_MOD) == REG_MOD_PELICAN_INITIAL &&
434 	    priv->read_reg(priv, SJA1000_SR) == REG_SR_PELICAN_INITIAL &&
435 	    priv->read_reg(priv, SJA1000_IR) == REG_IR_PELICAN_INITIAL)
436 		return flag;
437 
438 	return 0;
439 }
440 
441 /*
442  * PLX9030/50/52 software reset
443  * Also LRESET# asserts and brings to reset device on the Local Bus (if wired).
444  * For most cards it's enough for reset the SJA1000 chips.
445  */
plx_pci_reset_common(struct pci_dev * pdev)446 static void plx_pci_reset_common(struct pci_dev *pdev)
447 {
448 	struct plx_pci_card *card = pci_get_drvdata(pdev);
449 	u32 cntrl;
450 
451 	cntrl = ioread32(card->conf_addr + PLX_CNTRL);
452 	cntrl |= PLX_PCI_RESET;
453 	iowrite32(cntrl, card->conf_addr + PLX_CNTRL);
454 	udelay(100);
455 	cntrl ^= PLX_PCI_RESET;
456 	iowrite32(cntrl, card->conf_addr + PLX_CNTRL);
457 };
458 
459 /*
460  * PLX9056 software reset
461  * Assert LRESET# and reset device(s) on the Local Bus (if wired).
462  */
plx9056_pci_reset_common(struct pci_dev * pdev)463 static void plx9056_pci_reset_common(struct pci_dev *pdev)
464 {
465 	struct plx_pci_card *card = pci_get_drvdata(pdev);
466 	u32 cntrl;
467 
468 	/* issue a local bus reset */
469 	cntrl = ioread32(card->conf_addr + PLX9056_CNTRL);
470 	cntrl |= PLX_PCI_RESET;
471 	iowrite32(cntrl, card->conf_addr + PLX9056_CNTRL);
472 	udelay(100);
473 	cntrl ^= PLX_PCI_RESET;
474 	iowrite32(cntrl, card->conf_addr + PLX9056_CNTRL);
475 
476 	/* reload local configuration from EEPROM */
477 	cntrl |= PLX9056_PCI_RCR;
478 	iowrite32(cntrl, card->conf_addr + PLX9056_CNTRL);
479 
480 	/*
481 	 * There is no safe way to poll for the end
482 	 * of reconfiguration process. Waiting for 10ms
483 	 * is safe.
484 	 */
485 	mdelay(10);
486 
487 	cntrl ^= PLX9056_PCI_RCR;
488 	iowrite32(cntrl, card->conf_addr + PLX9056_CNTRL);
489 };
490 
491 /* Special reset function for Marathon CAN-bus-PCI card */
plx_pci_reset_marathon_pci(struct pci_dev * pdev)492 static void plx_pci_reset_marathon_pci(struct pci_dev *pdev)
493 {
494 	void __iomem *reset_addr;
495 	int i;
496 	static const int reset_bar[2] = {3, 5};
497 
498 	plx_pci_reset_common(pdev);
499 
500 	for (i = 0; i < 2; i++) {
501 		reset_addr = pci_iomap(pdev, reset_bar[i], 0);
502 		if (!reset_addr) {
503 			dev_err(&pdev->dev, "Failed to remap reset "
504 				"space %d (BAR%d)\n", i, reset_bar[i]);
505 		} else {
506 			/* reset the SJA1000 chip */
507 			iowrite8(0x1, reset_addr);
508 			udelay(100);
509 			pci_iounmap(pdev, reset_addr);
510 		}
511 	}
512 }
513 
514 /* Special reset function for Marathon CAN-bus-PCIe card */
plx_pci_reset_marathon_pcie(struct pci_dev * pdev)515 static void plx_pci_reset_marathon_pcie(struct pci_dev *pdev)
516 {
517 	void __iomem *addr;
518 	void __iomem *reset_addr;
519 	int i;
520 
521 	plx9056_pci_reset_common(pdev);
522 
523 	for (i = 0; i < 2; i++) {
524 		struct plx_pci_channel_map *chan_map =
525 			&plx_pci_card_info_marathon_pcie.chan_map_tbl[i];
526 		addr = pci_iomap(pdev, chan_map->bar, chan_map->size);
527 		if (!addr) {
528 			dev_err(&pdev->dev, "Failed to remap reset "
529 				"space %d (BAR%d)\n", i, chan_map->bar);
530 		} else {
531 			/* reset the SJA1000 chip */
532 			#define MARATHON_PCIE_RESET_OFFSET 32
533 			reset_addr = addr + chan_map->offset +
534 			             MARATHON_PCIE_RESET_OFFSET;
535 			iowrite8(0x1, reset_addr);
536 			udelay(100);
537 			pci_iounmap(pdev, addr);
538 		}
539 	}
540 }
541 
542 /* Special reset function for ASEM Dual CAN raw card */
plx_pci_reset_asem_dual_can_raw(struct pci_dev * pdev)543 static void plx_pci_reset_asem_dual_can_raw(struct pci_dev *pdev)
544 {
545 	void __iomem *bar0_addr;
546 	u8 tmpval;
547 
548 	plx_pci_reset_common(pdev);
549 
550 	bar0_addr = pci_iomap(pdev, 0, 0);
551 	if (!bar0_addr) {
552 		dev_err(&pdev->dev, "Failed to remap reset space 0 (BAR0)\n");
553 		return;
554 	}
555 
556 	/* reset the two SJA1000 chips */
557 	tmpval = ioread8(bar0_addr + ASEM_RAW_CAN_RST_REGISTER);
558 	tmpval &= ~(ASEM_RAW_CAN_RST_MASK_CAN1 | ASEM_RAW_CAN_RST_MASK_CAN2);
559 	iowrite8(tmpval, bar0_addr + ASEM_RAW_CAN_RST_REGISTER);
560 	usleep_range(300, 400);
561 	tmpval |= ASEM_RAW_CAN_RST_MASK_CAN1 | ASEM_RAW_CAN_RST_MASK_CAN2;
562 	iowrite8(tmpval, bar0_addr + ASEM_RAW_CAN_RST_REGISTER);
563 	usleep_range(300, 400);
564 	pci_iounmap(pdev, bar0_addr);
565 }
566 
plx_pci_del_card(struct pci_dev * pdev)567 static void plx_pci_del_card(struct pci_dev *pdev)
568 {
569 	struct plx_pci_card *card = pci_get_drvdata(pdev);
570 	struct net_device *dev;
571 	struct sja1000_priv *priv;
572 	int i = 0;
573 
574 	for (i = 0; i < PLX_PCI_MAX_CHAN; i++) {
575 		dev = card->net_dev[i];
576 		if (!dev)
577 			continue;
578 
579 		dev_info(&pdev->dev, "Removing %s\n", dev->name);
580 		unregister_sja1000dev(dev);
581 		priv = netdev_priv(dev);
582 		if (priv->reg_base)
583 			pci_iounmap(pdev, priv->reg_base);
584 		free_sja1000dev(dev);
585 	}
586 
587 	card->reset_func(pdev);
588 
589 	/*
590 	 * Disable interrupts from PCI-card and disable local
591 	 * interrupts
592 	 */
593 	if (pdev->device != PCI_DEVICE_ID_PLX_9056 &&
594 	    pdev->device != MARATHON_PCIE_DEVICE_ID)
595 		iowrite32(0x0, card->conf_addr + PLX_INTCSR);
596 	else
597 		iowrite32(0x0, card->conf_addr + PLX9056_INTCSR);
598 
599 	if (card->conf_addr)
600 		pci_iounmap(pdev, card->conf_addr);
601 
602 	kfree(card);
603 
604 	pci_disable_device(pdev);
605 }
606 
607 /*
608  * Probe PLX90xx based device for the SJA1000 chips and register each
609  * available CAN channel to SJA1000 Socket-CAN subsystem.
610  */
plx_pci_add_card(struct pci_dev * pdev,const struct pci_device_id * ent)611 static int plx_pci_add_card(struct pci_dev *pdev,
612 			    const struct pci_device_id *ent)
613 {
614 	struct sja1000_priv *priv;
615 	struct net_device *dev;
616 	struct plx_pci_card *card;
617 	struct plx_pci_card_info *ci;
618 	int err, i;
619 	u32 val;
620 	void __iomem *addr;
621 
622 	ci = (struct plx_pci_card_info *)ent->driver_data;
623 
624 	if (pci_enable_device(pdev) < 0) {
625 		dev_err(&pdev->dev, "Failed to enable PCI device\n");
626 		return -ENODEV;
627 	}
628 
629 	dev_info(&pdev->dev, "Detected \"%s\" card at slot #%i\n",
630 		 ci->name, PCI_SLOT(pdev->devfn));
631 
632 	/* Allocate card structures to hold addresses, ... */
633 	card = kzalloc(sizeof(*card), GFP_KERNEL);
634 	if (!card) {
635 		pci_disable_device(pdev);
636 		return -ENOMEM;
637 	}
638 
639 	pci_set_drvdata(pdev, card);
640 
641 	card->channels = 0;
642 
643 	/* Remap PLX90xx configuration space */
644 	addr = pci_iomap(pdev, ci->conf_map.bar, ci->conf_map.size);
645 	if (!addr) {
646 		err = -ENOMEM;
647 		dev_err(&pdev->dev, "Failed to remap configuration space "
648 			"(BAR%d)\n", ci->conf_map.bar);
649 		goto failure_cleanup;
650 	}
651 	card->conf_addr = addr + ci->conf_map.offset;
652 
653 	ci->reset_func(pdev);
654 	card->reset_func = ci->reset_func;
655 
656 	/* Detect available channels */
657 	for (i = 0; i < ci->channel_count; i++) {
658 		struct plx_pci_channel_map *cm = &ci->chan_map_tbl[i];
659 
660 		dev = alloc_sja1000dev(0);
661 		if (!dev) {
662 			err = -ENOMEM;
663 			goto failure_cleanup;
664 		}
665 
666 		card->net_dev[i] = dev;
667 		priv = netdev_priv(dev);
668 		priv->priv = card;
669 		priv->irq_flags = IRQF_SHARED;
670 
671 		dev->irq = pdev->irq;
672 
673 		/*
674 		 * Remap IO space of the SJA1000 chips
675 		 * This is device-dependent mapping
676 		 */
677 		addr = pci_iomap(pdev, cm->bar, cm->size);
678 		if (!addr) {
679 			err = -ENOMEM;
680 			dev_err(&pdev->dev, "Failed to remap BAR%d\n", cm->bar);
681 			goto failure_cleanup;
682 		}
683 
684 		priv->reg_base = addr + cm->offset;
685 		priv->read_reg = plx_pci_read_reg;
686 		priv->write_reg = plx_pci_write_reg;
687 
688 		/* Check if channel is present */
689 		if (plx_pci_check_sja1000(priv)) {
690 			priv->can.clock.freq = ci->can_clock;
691 			priv->ocr = ci->ocr;
692 			priv->cdr = ci->cdr;
693 
694 			SET_NETDEV_DEV(dev, &pdev->dev);
695 			dev->dev_id = i;
696 
697 			/* Register SJA1000 device */
698 			err = register_sja1000dev(dev);
699 			if (err) {
700 				dev_err(&pdev->dev, "Registering device failed "
701 					"(err=%d)\n", err);
702 				goto failure_cleanup;
703 			}
704 
705 			card->channels++;
706 
707 			dev_info(&pdev->dev, "Channel #%d at 0x%p, irq %d "
708 				 "registered as %s\n", i + 1, priv->reg_base,
709 				 dev->irq, dev->name);
710 		} else {
711 			dev_err(&pdev->dev, "Channel #%d not detected\n",
712 				i + 1);
713 			free_sja1000dev(dev);
714 			card->net_dev[i] = NULL;
715 		}
716 	}
717 
718 	if (!card->channels) {
719 		err = -ENODEV;
720 		goto failure_cleanup;
721 	}
722 
723 	/*
724 	 * Enable interrupts from PCI-card (PLX90xx) and enable Local_1,
725 	 * Local_2 interrupts from the SJA1000 chips
726 	 */
727 	if (pdev->device != PCI_DEVICE_ID_PLX_9056 &&
728 	    pdev->device != MARATHON_PCIE_DEVICE_ID) {
729 		val = ioread32(card->conf_addr + PLX_INTCSR);
730 		if (pdev->subsystem_vendor == PCI_VENDOR_ID_ESDGMBH)
731 			val |= PLX_LINT1_EN | PLX_PCI_INT_EN;
732 		else
733 			val |= PLX_LINT1_EN | PLX_LINT2_EN | PLX_PCI_INT_EN;
734 		iowrite32(val, card->conf_addr + PLX_INTCSR);
735 	} else {
736 		iowrite32(PLX9056_LINTI | PLX9056_PCI_INT_EN,
737 			  card->conf_addr + PLX9056_INTCSR);
738 	}
739 	return 0;
740 
741 failure_cleanup:
742 	dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err);
743 
744 	plx_pci_del_card(pdev);
745 
746 	return err;
747 }
748 
749 static struct pci_driver plx_pci_driver = {
750 	.name = DRV_NAME,
751 	.id_table = plx_pci_tbl,
752 	.probe = plx_pci_add_card,
753 	.remove = plx_pci_del_card,
754 };
755 
756 module_pci_driver(plx_pci_driver);
757