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-rw-r--r--drivers/net/can/Kconfig8
-rw-r--r--drivers/net/can/Makefile1
-rw-r--r--drivers/net/can/pch_can.c1463
3 files changed, 1472 insertions, 0 deletions
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index 9d9e45394433..a0b02bce694c 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -82,6 +82,14 @@ config CAN_FLEXCAN
82 ---help--- 82 ---help---
83 Say Y here if you want to support for Freescale FlexCAN. 83 Say Y here if you want to support for Freescale FlexCAN.
84 84
85config PCH_CAN
86 tristate "PCH CAN"
87 depends on CAN_DEV
88 ---help---
89 This driver is for PCH CAN of Topcliff which is an IOH for x86
90 embedded processor.
91 This driver can access CAN bus.
92
85source "drivers/net/can/mscan/Kconfig" 93source "drivers/net/can/mscan/Kconfig"
86 94
87source "drivers/net/can/sja1000/Kconfig" 95source "drivers/net/can/sja1000/Kconfig"
diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
index 00575373bbd0..90af15a4f106 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -17,5 +17,6 @@ obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
17obj-$(CONFIG_CAN_BFIN) += bfin_can.o 17obj-$(CONFIG_CAN_BFIN) += bfin_can.o
18obj-$(CONFIG_CAN_JANZ_ICAN3) += janz-ican3.o 18obj-$(CONFIG_CAN_JANZ_ICAN3) += janz-ican3.o
19obj-$(CONFIG_CAN_FLEXCAN) += flexcan.o 19obj-$(CONFIG_CAN_FLEXCAN) += flexcan.o
20obj-$(CONFIG_PCH_CAN) += pch_can.o
20 21
21ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG 22ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
new file mode 100644
index 000000000000..55ec324caaf4
--- /dev/null
+++ b/drivers/net/can/pch_can.c
@@ -0,0 +1,1463 @@
1/*
2 * Copyright (C) 1999 - 2010 Intel Corporation.
3 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#include <linux/interrupt.h>
20#include <linux/delay.h>
21#include <linux/io.h>
22#include <linux/module.h>
23#include <linux/sched.h>
24#include <linux/pci.h>
25#include <linux/init.h>
26#include <linux/kernel.h>
27#include <linux/types.h>
28#include <linux/errno.h>
29#include <linux/netdevice.h>
30#include <linux/skbuff.h>
31#include <linux/can.h>
32#include <linux/can/dev.h>
33#include <linux/can/error.h>
34
35#define MAX_MSG_OBJ 32
36#define MSG_OBJ_RX 0 /* The receive message object flag. */
37#define MSG_OBJ_TX 1 /* The transmit message object flag. */
38
39#define ENABLE 1 /* The enable flag */
40#define DISABLE 0 /* The disable flag */
41#define CAN_CTRL_INIT 0x0001 /* The INIT bit of CANCONT register. */
42#define CAN_CTRL_IE 0x0002 /* The IE bit of CAN control register */
43#define CAN_CTRL_IE_SIE_EIE 0x000e
44#define CAN_CTRL_CCE 0x0040
45#define CAN_CTRL_OPT 0x0080 /* The OPT bit of CANCONT register. */
46#define CAN_OPT_SILENT 0x0008 /* The Silent bit of CANOPT reg. */
47#define CAN_OPT_LBACK 0x0010 /* The LoopBack bit of CANOPT reg. */
48#define CAN_CMASK_RX_TX_SET 0x00f3
49#define CAN_CMASK_RX_TX_GET 0x0073
50#define CAN_CMASK_ALL 0xff
51#define CAN_CMASK_RDWR 0x80
52#define CAN_CMASK_ARB 0x20
53#define CAN_CMASK_CTRL 0x10
54#define CAN_CMASK_MASK 0x40
55#define CAN_CMASK_NEWDAT 0x04
56#define CAN_CMASK_CLRINTPND 0x08
57
58#define CAN_IF_MCONT_NEWDAT 0x8000
59#define CAN_IF_MCONT_INTPND 0x2000
60#define CAN_IF_MCONT_UMASK 0x1000
61#define CAN_IF_MCONT_TXIE 0x0800
62#define CAN_IF_MCONT_RXIE 0x0400
63#define CAN_IF_MCONT_RMTEN 0x0200
64#define CAN_IF_MCONT_TXRQXT 0x0100
65#define CAN_IF_MCONT_EOB 0x0080
66#define CAN_IF_MCONT_DLC 0x000f
67#define CAN_IF_MCONT_MSGLOST 0x4000
68#define CAN_MASK2_MDIR_MXTD 0xc000
69#define CAN_ID2_DIR 0x2000
70#define CAN_ID_MSGVAL 0x8000
71
72#define CAN_STATUS_INT 0x8000
73#define CAN_IF_CREQ_BUSY 0x8000
74#define CAN_ID2_XTD 0x4000
75
76#define CAN_REC 0x00007f00
77#define CAN_TEC 0x000000ff
78
79#define PCH_RX_OK 0x00000010
80#define PCH_TX_OK 0x00000008
81#define PCH_BUS_OFF 0x00000080
82#define PCH_EWARN 0x00000040
83#define PCH_EPASSIV 0x00000020
84#define PCH_LEC0 0x00000001
85#define PCH_LEC1 0x00000002
86#define PCH_LEC2 0x00000004
87#define PCH_LEC_ALL (PCH_LEC0 | PCH_LEC1 | PCH_LEC2)
88#define PCH_STUF_ERR PCH_LEC0
89#define PCH_FORM_ERR PCH_LEC1
90#define PCH_ACK_ERR (PCH_LEC0 | PCH_LEC1)
91#define PCH_BIT1_ERR PCH_LEC2
92#define PCH_BIT0_ERR (PCH_LEC0 | PCH_LEC2)
93#define PCH_CRC_ERR (PCH_LEC1 | PCH_LEC2)
94
95/* bit position of certain controller bits. */
96#define BIT_BITT_BRP 0
97#define BIT_BITT_SJW 6
98#define BIT_BITT_TSEG1 8
99#define BIT_BITT_TSEG2 12
100#define BIT_IF1_MCONT_RXIE 10
101#define BIT_IF2_MCONT_TXIE 11
102#define BIT_BRPE_BRPE 6
103#define BIT_ES_TXERRCNT 0
104#define BIT_ES_RXERRCNT 8
105#define MSK_BITT_BRP 0x3f
106#define MSK_BITT_SJW 0xc0
107#define MSK_BITT_TSEG1 0xf00
108#define MSK_BITT_TSEG2 0x7000
109#define MSK_BRPE_BRPE 0x3c0
110#define MSK_BRPE_GET 0x0f
111#define MSK_CTRL_IE_SIE_EIE 0x07
112#define MSK_MCONT_TXIE 0x08
113#define MSK_MCONT_RXIE 0x10
114#define PCH_CAN_NO_TX_BUFF 1
115#define COUNTER_LIMIT 10
116
117#define PCH_CAN_CLK 50000000 /* 50MHz */
118
119/* Define the number of message object.
120 * PCH CAN communications are done via Message RAM.
121 * The Message RAM consists of 32 message objects. */
122#define PCH_RX_OBJ_NUM 26 /* 1~ PCH_RX_OBJ_NUM is Rx*/
123#define PCH_TX_OBJ_NUM 6 /* PCH_RX_OBJ_NUM is RX ~ Tx*/
124#define PCH_OBJ_NUM (PCH_TX_OBJ_NUM + PCH_RX_OBJ_NUM)
125
126#define PCH_FIFO_THRESH 16
127
128enum pch_can_mode {
129 PCH_CAN_ENABLE,
130 PCH_CAN_DISABLE,
131 PCH_CAN_ALL,
132 PCH_CAN_NONE,
133 PCH_CAN_STOP,
134 PCH_CAN_RUN
135};
136
137struct pch_can_regs {
138 u32 cont;
139 u32 stat;
140 u32 errc;
141 u32 bitt;
142 u32 intr;
143 u32 opt;
144 u32 brpe;
145 u32 reserve1;
146 u32 if1_creq;
147 u32 if1_cmask;
148 u32 if1_mask1;
149 u32 if1_mask2;
150 u32 if1_id1;
151 u32 if1_id2;
152 u32 if1_mcont;
153 u32 if1_dataa1;
154 u32 if1_dataa2;
155 u32 if1_datab1;
156 u32 if1_datab2;
157 u32 reserve2;
158 u32 reserve3[12];
159 u32 if2_creq;
160 u32 if2_cmask;
161 u32 if2_mask1;
162 u32 if2_mask2;
163 u32 if2_id1;
164 u32 if2_id2;
165 u32 if2_mcont;
166 u32 if2_dataa1;
167 u32 if2_dataa2;
168 u32 if2_datab1;
169 u32 if2_datab2;
170 u32 reserve4;
171 u32 reserve5[20];
172 u32 treq1;
173 u32 treq2;
174 u32 reserve6[2];
175 u32 reserve7[56];
176 u32 reserve8[3];
177 u32 srst;
178};
179
180struct pch_can_priv {
181 struct can_priv can;
182 unsigned int can_num;
183 struct pci_dev *dev;
184 unsigned int tx_enable[MAX_MSG_OBJ];
185 unsigned int rx_enable[MAX_MSG_OBJ];
186 unsigned int rx_link[MAX_MSG_OBJ];
187 unsigned int int_enables;
188 unsigned int int_stat;
189 struct net_device *ndev;
190 spinlock_t msgif_reg_lock; /* Message Interface Registers Access Lock*/
191 unsigned int msg_obj[MAX_MSG_OBJ];
192 struct pch_can_regs __iomem *regs;
193 struct napi_struct napi;
194 unsigned int tx_obj; /* Point next Tx Obj index */
195 unsigned int use_msi;
196};
197
198static struct can_bittiming_const pch_can_bittiming_const = {
199 .name = KBUILD_MODNAME,
200 .tseg1_min = 1,
201 .tseg1_max = 16,
202 .tseg2_min = 1,
203 .tseg2_max = 8,
204 .sjw_max = 4,
205 .brp_min = 1,
206 .brp_max = 1024, /* 6bit + extended 4bit */
207 .brp_inc = 1,
208};
209
210static DEFINE_PCI_DEVICE_TABLE(pch_pci_tbl) = {
211 {PCI_VENDOR_ID_INTEL, 0x8818, PCI_ANY_ID, PCI_ANY_ID,},
212 {0,}
213};
214MODULE_DEVICE_TABLE(pci, pch_pci_tbl);
215
216static inline void pch_can_bit_set(u32 *addr, u32 mask)
217{
218 iowrite32(ioread32(addr) | mask, addr);
219}
220
221static inline void pch_can_bit_clear(u32 *addr, u32 mask)
222{
223 iowrite32(ioread32(addr) & ~mask, addr);
224}
225
226static void pch_can_set_run_mode(struct pch_can_priv *priv,
227 enum pch_can_mode mode)
228{
229 switch (mode) {
230 case PCH_CAN_RUN:
231 pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_INIT);
232 break;
233
234 case PCH_CAN_STOP:
235 pch_can_bit_set(&priv->regs->cont, CAN_CTRL_INIT);
236 break;
237
238 default:
239 dev_err(&priv->ndev->dev, "%s -> Invalid Mode.\n", __func__);
240 break;
241 }
242}
243
244static void pch_can_set_optmode(struct pch_can_priv *priv)
245{
246 u32 reg_val = ioread32(&priv->regs->opt);
247
248 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
249 reg_val |= CAN_OPT_SILENT;
250
251 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
252 reg_val |= CAN_OPT_LBACK;
253
254 pch_can_bit_set(&priv->regs->cont, CAN_CTRL_OPT);
255 iowrite32(reg_val, &priv->regs->opt);
256}
257
258static void pch_can_set_int_custom(struct pch_can_priv *priv)
259{
260 /* Clearing the IE, SIE and EIE bits of Can control register. */
261 pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE);
262
263 /* Appropriately setting them. */
264 pch_can_bit_set(&priv->regs->cont,
265 ((priv->int_enables & MSK_CTRL_IE_SIE_EIE) << 1));
266}
267
268/* This function retrieves interrupt enabled for the CAN device. */
269static void pch_can_get_int_enables(struct pch_can_priv *priv, u32 *enables)
270{
271 /* Obtaining the status of IE, SIE and EIE interrupt bits. */
272 *enables = ((ioread32(&priv->regs->cont) & CAN_CTRL_IE_SIE_EIE) >> 1);
273}
274
275static void pch_can_set_int_enables(struct pch_can_priv *priv,
276 enum pch_can_mode interrupt_no)
277{
278 switch (interrupt_no) {
279 case PCH_CAN_ENABLE:
280 pch_can_bit_set(&priv->regs->cont, CAN_CTRL_IE);
281 break;
282
283 case PCH_CAN_DISABLE:
284 pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE);
285 break;
286
287 case PCH_CAN_ALL:
288 pch_can_bit_set(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE);
289 break;
290
291 case PCH_CAN_NONE:
292 pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE);
293 break;
294
295 default:
296 dev_err(&priv->ndev->dev, "Invalid interrupt number.\n");
297 break;
298 }
299}
300
301static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num)
302{
303 u32 counter = COUNTER_LIMIT;
304 u32 ifx_creq;
305
306 iowrite32(num, creq_addr);
307 while (counter) {
308 ifx_creq = ioread32(creq_addr) & CAN_IF_CREQ_BUSY;
309 if (!ifx_creq)
310 break;
311 counter--;
312 udelay(1);
313 }
314 if (!counter)
315 pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__);
316}
317
318static void pch_can_set_rx_enable(struct pch_can_priv *priv, u32 buff_num,
319 u32 set)
320{
321 unsigned long flags;
322
323 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
324 /* Reading the receive buffer data from RAM to Interface1 registers */
325 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
326 pch_can_check_if_busy(&priv->regs->if1_creq, buff_num);
327
328 /* Setting the IF1MASK1 register to access MsgVal and RxIE bits */
329 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_ARB | CAN_CMASK_CTRL,
330 &priv->regs->if1_cmask);
331
332 if (set == ENABLE) {
333 /* Setting the MsgVal and RxIE bits */
334 pch_can_bit_set(&priv->regs->if1_mcont, CAN_IF_MCONT_RXIE);
335 pch_can_bit_set(&priv->regs->if1_id2, CAN_ID_MSGVAL);
336
337 } else if (set == DISABLE) {
338 /* Resetting the MsgVal and RxIE bits */
339 pch_can_bit_clear(&priv->regs->if1_mcont, CAN_IF_MCONT_RXIE);
340 pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID_MSGVAL);
341 }
342
343 pch_can_check_if_busy(&priv->regs->if1_creq, buff_num);
344 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
345}
346
347static void pch_can_rx_enable_all(struct pch_can_priv *priv)
348{
349 int i;
350
351 /* Traversing to obtain the object configured as receivers. */
352 for (i = 0; i < PCH_OBJ_NUM; i++) {
353 if (priv->msg_obj[i] == MSG_OBJ_RX)
354 pch_can_set_rx_enable(priv, i + 1, ENABLE);
355 }
356}
357
358static void pch_can_rx_disable_all(struct pch_can_priv *priv)
359{
360 int i;
361
362 /* Traversing to obtain the object configured as receivers. */
363 for (i = 0; i < PCH_OBJ_NUM; i++) {
364 if (priv->msg_obj[i] == MSG_OBJ_RX)
365 pch_can_set_rx_enable(priv, i + 1, DISABLE);
366 }
367}
368
369static void pch_can_set_tx_enable(struct pch_can_priv *priv, u32 buff_num,
370 u32 set)
371{
372 unsigned long flags;
373
374 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
375 /* Reading the Msg buffer from Message RAM to Interface2 registers. */
376 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
377 pch_can_check_if_busy(&priv->regs->if2_creq, buff_num);
378
379 /* Setting the IF2CMASK register for accessing the
380 MsgVal and TxIE bits */
381 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_ARB | CAN_CMASK_CTRL,
382 &priv->regs->if2_cmask);
383
384 if (set == ENABLE) {
385 /* Setting the MsgVal and TxIE bits */
386 pch_can_bit_set(&priv->regs->if2_mcont, CAN_IF_MCONT_TXIE);
387 pch_can_bit_set(&priv->regs->if2_id2, CAN_ID_MSGVAL);
388 } else if (set == DISABLE) {
389 /* Resetting the MsgVal and TxIE bits. */
390 pch_can_bit_clear(&priv->regs->if2_mcont, CAN_IF_MCONT_TXIE);
391 pch_can_bit_clear(&priv->regs->if2_id2, CAN_ID_MSGVAL);
392 }
393
394 pch_can_check_if_busy(&priv->regs->if2_creq, buff_num);
395 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
396}
397
398static void pch_can_tx_enable_all(struct pch_can_priv *priv)
399{
400 int i;
401
402 /* Traversing to obtain the object configured as transmit object. */
403 for (i = 0; i < PCH_OBJ_NUM; i++) {
404 if (priv->msg_obj[i] == MSG_OBJ_TX)
405 pch_can_set_tx_enable(priv, i + 1, ENABLE);
406 }
407}
408
409static void pch_can_tx_disable_all(struct pch_can_priv *priv)
410{
411 int i;
412
413 /* Traversing to obtain the object configured as transmit object. */
414 for (i = 0; i < PCH_OBJ_NUM; i++) {
415 if (priv->msg_obj[i] == MSG_OBJ_TX)
416 pch_can_set_tx_enable(priv, i + 1, DISABLE);
417 }
418}
419
420static void pch_can_get_rx_enable(struct pch_can_priv *priv, u32 buff_num,
421 u32 *enable)
422{
423 unsigned long flags;
424
425 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
426 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
427 pch_can_check_if_busy(&priv->regs->if1_creq, buff_num);
428
429 if (((ioread32(&priv->regs->if1_id2)) & CAN_ID_MSGVAL) &&
430 ((ioread32(&priv->regs->if1_mcont)) &
431 CAN_IF_MCONT_RXIE))
432 *enable = ENABLE;
433 else
434 *enable = DISABLE;
435 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
436}
437
438static void pch_can_get_tx_enable(struct pch_can_priv *priv, u32 buff_num,
439 u32 *enable)
440{
441 unsigned long flags;
442
443 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
444 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
445 pch_can_check_if_busy(&priv->regs->if2_creq, buff_num);
446
447 if (((ioread32(&priv->regs->if2_id2)) & CAN_ID_MSGVAL) &&
448 ((ioread32(&priv->regs->if2_mcont)) &
449 CAN_IF_MCONT_TXIE)) {
450 *enable = ENABLE;
451 } else {
452 *enable = DISABLE;
453 }
454 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
455}
456
457static int pch_can_int_pending(struct pch_can_priv *priv)
458{
459 return ioread32(&priv->regs->intr) & 0xffff;
460}
461
462static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
463 u32 buffer_num, u32 set)
464{
465 unsigned long flags;
466
467 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
468 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
469 pch_can_check_if_busy(&priv->regs->if1_creq, buffer_num);
470 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL, &priv->regs->if1_cmask);
471 if (set == ENABLE)
472 pch_can_bit_clear(&priv->regs->if1_mcont, CAN_IF_MCONT_EOB);
473 else
474 pch_can_bit_set(&priv->regs->if1_mcont, CAN_IF_MCONT_EOB);
475
476 pch_can_check_if_busy(&priv->regs->if1_creq, buffer_num);
477 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
478}
479
480static void pch_can_get_rx_buffer_link(struct pch_can_priv *priv,
481 u32 buffer_num, u32 *link)
482{
483 unsigned long flags;
484
485 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
486 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
487 pch_can_check_if_busy(&priv->regs->if1_creq, buffer_num);
488
489 if (ioread32(&priv->regs->if1_mcont) & CAN_IF_MCONT_EOB)
490 *link = DISABLE;
491 else
492 *link = ENABLE;
493 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
494}
495
496static void pch_can_clear_buffers(struct pch_can_priv *priv)
497{
498 int i;
499
500 for (i = 0; i < PCH_RX_OBJ_NUM; i++) {
501 iowrite32(CAN_CMASK_RX_TX_SET, &priv->regs->if1_cmask);
502 iowrite32(0xffff, &priv->regs->if1_mask1);
503 iowrite32(0xffff, &priv->regs->if1_mask2);
504 iowrite32(0x0, &priv->regs->if1_id1);
505 iowrite32(0x0, &priv->regs->if1_id2);
506 iowrite32(0x0, &priv->regs->if1_mcont);
507 iowrite32(0x0, &priv->regs->if1_dataa1);
508 iowrite32(0x0, &priv->regs->if1_dataa2);
509 iowrite32(0x0, &priv->regs->if1_datab1);
510 iowrite32(0x0, &priv->regs->if1_datab2);
511 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
512 CAN_CMASK_ARB | CAN_CMASK_CTRL,
513 &priv->regs->if1_cmask);
514 pch_can_check_if_busy(&priv->regs->if1_creq, i+1);
515 }
516
517 for (i = i; i < PCH_OBJ_NUM; i++) {
518 iowrite32(CAN_CMASK_RX_TX_SET, &priv->regs->if2_cmask);
519 iowrite32(0xffff, &priv->regs->if2_mask1);
520 iowrite32(0xffff, &priv->regs->if2_mask2);
521 iowrite32(0x0, &priv->regs->if2_id1);
522 iowrite32(0x0, &priv->regs->if2_id2);
523 iowrite32(0x0, &priv->regs->if2_mcont);
524 iowrite32(0x0, &priv->regs->if2_dataa1);
525 iowrite32(0x0, &priv->regs->if2_dataa2);
526 iowrite32(0x0, &priv->regs->if2_datab1);
527 iowrite32(0x0, &priv->regs->if2_datab2);
528 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
529 CAN_CMASK_ARB | CAN_CMASK_CTRL,
530 &priv->regs->if2_cmask);
531 pch_can_check_if_busy(&priv->regs->if2_creq, i+1);
532 }
533}
534
535static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
536{
537 int i;
538 unsigned long flags;
539
540 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
541
542 for (i = 0; i < PCH_OBJ_NUM; i++) {
543 if (priv->msg_obj[i] == MSG_OBJ_RX) {
544 iowrite32(CAN_CMASK_RX_TX_GET,
545 &priv->regs->if1_cmask);
546 pch_can_check_if_busy(&priv->regs->if1_creq, i+1);
547
548 iowrite32(0x0, &priv->regs->if1_id1);
549 iowrite32(0x0, &priv->regs->if1_id2);
550
551 pch_can_bit_set(&priv->regs->if1_mcont,
552 CAN_IF_MCONT_UMASK);
553
554 /* Set FIFO mode set to 0 except last Rx Obj*/
555 pch_can_bit_clear(&priv->regs->if1_mcont,
556 CAN_IF_MCONT_EOB);
557 /* In case FIFO mode, Last EoB of Rx Obj must be 1 */
558 if (i == (PCH_RX_OBJ_NUM - 1))
559 pch_can_bit_set(&priv->regs->if1_mcont,
560 CAN_IF_MCONT_EOB);
561
562 iowrite32(0, &priv->regs->if1_mask1);
563 pch_can_bit_clear(&priv->regs->if1_mask2,
564 0x1fff | CAN_MASK2_MDIR_MXTD);
565
566 /* Setting CMASK for writing */
567 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
568 CAN_CMASK_ARB | CAN_CMASK_CTRL,
569 &priv->regs->if1_cmask);
570
571 pch_can_check_if_busy(&priv->regs->if1_creq, i+1);
572 } else if (priv->msg_obj[i] == MSG_OBJ_TX) {
573 iowrite32(CAN_CMASK_RX_TX_GET,
574 &priv->regs->if2_cmask);
575 pch_can_check_if_busy(&priv->regs->if2_creq, i+1);
576
577 /* Resetting DIR bit for reception */
578 iowrite32(0x0, &priv->regs->if2_id1);
579 iowrite32(0x0, &priv->regs->if2_id2);
580 pch_can_bit_set(&priv->regs->if2_id2, CAN_ID2_DIR);
581
582 /* Setting EOB bit for transmitter */
583 iowrite32(CAN_IF_MCONT_EOB, &priv->regs->if2_mcont);
584
585 pch_can_bit_set(&priv->regs->if2_mcont,
586 CAN_IF_MCONT_UMASK);
587
588 iowrite32(0, &priv->regs->if2_mask1);
589 pch_can_bit_clear(&priv->regs->if2_mask2, 0x1fff);
590
591 /* Setting CMASK for writing */
592 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
593 CAN_CMASK_ARB | CAN_CMASK_CTRL,
594 &priv->regs->if2_cmask);
595
596 pch_can_check_if_busy(&priv->regs->if2_creq, i+1);
597 }
598 }
599 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
600}
601
602static void pch_can_init(struct pch_can_priv *priv)
603{
604 /* Stopping the Can device. */
605 pch_can_set_run_mode(priv, PCH_CAN_STOP);
606
607 /* Clearing all the message object buffers. */
608 pch_can_clear_buffers(priv);
609
610 /* Configuring the respective message object as either rx/tx object. */
611 pch_can_config_rx_tx_buffers(priv);
612
613 /* Enabling the interrupts. */
614 pch_can_set_int_enables(priv, PCH_CAN_ALL);
615}
616
617static void pch_can_release(struct pch_can_priv *priv)
618{
619 /* Stooping the CAN device. */
620 pch_can_set_run_mode(priv, PCH_CAN_STOP);
621
622 /* Disabling the interrupts. */
623 pch_can_set_int_enables(priv, PCH_CAN_NONE);
624
625 /* Disabling all the receive object. */
626 pch_can_rx_disable_all(priv);
627
628 /* Disabling all the transmit object. */
629 pch_can_tx_disable_all(priv);
630}
631
632/* This function clears interrupt(s) from the CAN device. */
633static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
634{
635 if (mask == CAN_STATUS_INT) {
636 ioread32(&priv->regs->stat);
637 return;
638 }
639
640 /* Clear interrupt for transmit object */
641 if (priv->msg_obj[mask - 1] == MSG_OBJ_TX) {
642 /* Setting CMASK for clearing interrupts for
643 frame transmission. */
644 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL | CAN_CMASK_ARB,
645 &priv->regs->if2_cmask);
646
647 /* Resetting the ID registers. */
648 pch_can_bit_set(&priv->regs->if2_id2,
649 CAN_ID2_DIR | (0x7ff << 2));
650 iowrite32(0x0, &priv->regs->if2_id1);
651
652 /* Claring NewDat, TxRqst & IntPnd */
653 pch_can_bit_clear(&priv->regs->if2_mcont,
654 CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND |
655 CAN_IF_MCONT_TXRQXT);
656 pch_can_check_if_busy(&priv->regs->if2_creq, mask);
657 } else if (priv->msg_obj[mask - 1] == MSG_OBJ_RX) {
658 /* Setting CMASK for clearing the reception interrupts. */
659 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL | CAN_CMASK_ARB,
660 &priv->regs->if1_cmask);
661
662 /* Clearing the Dir bit. */
663 pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID2_DIR);
664
665 /* Clearing NewDat & IntPnd */
666 pch_can_bit_clear(&priv->regs->if1_mcont,
667 CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND);
668
669 pch_can_check_if_busy(&priv->regs->if1_creq, mask);
670 }
671}
672
673static int pch_can_get_buffer_status(struct pch_can_priv *priv)
674{
675 return (ioread32(&priv->regs->treq1) & 0xffff) |
676 ((ioread32(&priv->regs->treq2) & 0xffff) << 16);
677}
678
679static void pch_can_reset(struct pch_can_priv *priv)
680{
681 /* write to sw reset register */
682 iowrite32(1, &priv->regs->srst);
683 iowrite32(0, &priv->regs->srst);
684}
685
686static void pch_can_error(struct net_device *ndev, u32 status)
687{
688 struct sk_buff *skb;
689 struct pch_can_priv *priv = netdev_priv(ndev);
690 struct can_frame *cf;
691 u32 errc;
692 struct net_device_stats *stats = &(priv->ndev->stats);
693 enum can_state state = priv->can.state;
694
695 skb = alloc_can_err_skb(ndev, &cf);
696 if (!skb)
697 return;
698
699 if (status & PCH_BUS_OFF) {
700 pch_can_tx_disable_all(priv);
701 pch_can_rx_disable_all(priv);
702 state = CAN_STATE_BUS_OFF;
703 cf->can_id |= CAN_ERR_BUSOFF;
704 can_bus_off(ndev);
705 pch_can_set_run_mode(priv, PCH_CAN_RUN);
706 dev_err(&ndev->dev, "%s -> Bus Off occurres.\n", __func__);
707 }
708
709 /* Warning interrupt. */
710 if (status & PCH_EWARN) {
711 state = CAN_STATE_ERROR_WARNING;
712 priv->can.can_stats.error_warning++;
713 cf->can_id |= CAN_ERR_CRTL;
714 errc = ioread32(&priv->regs->errc);
715 if (((errc & CAN_REC) >> 8) > 96)
716 cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
717 if ((errc & CAN_TEC) > 96)
718 cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
719 dev_warn(&ndev->dev,
720 "%s -> Error Counter is more than 96.\n", __func__);
721 }
722 /* Error passive interrupt. */
723 if (status & PCH_EPASSIV) {
724 priv->can.can_stats.error_passive++;
725 state = CAN_STATE_ERROR_PASSIVE;
726 cf->can_id |= CAN_ERR_CRTL;
727 errc = ioread32(&priv->regs->errc);
728 if (((errc & CAN_REC) >> 8) > 127)
729 cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
730 if ((errc & CAN_TEC) > 127)
731 cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
732 dev_err(&ndev->dev,
733 "%s -> CAN controller is ERROR PASSIVE .\n", __func__);
734 }
735
736 if (status & PCH_LEC_ALL) {
737 priv->can.can_stats.bus_error++;
738 stats->rx_errors++;
739 switch (status & PCH_LEC_ALL) {
740 case PCH_STUF_ERR:
741 cf->data[2] |= CAN_ERR_PROT_STUFF;
742 break;
743 case PCH_FORM_ERR:
744 cf->data[2] |= CAN_ERR_PROT_FORM;
745 break;
746 case PCH_ACK_ERR:
747 cf->data[2] |= CAN_ERR_PROT_LOC_ACK |
748 CAN_ERR_PROT_LOC_ACK_DEL;
749 break;
750 case PCH_BIT1_ERR:
751 case PCH_BIT0_ERR:
752 cf->data[2] |= CAN_ERR_PROT_BIT;
753 break;
754 case PCH_CRC_ERR:
755 cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ |
756 CAN_ERR_PROT_LOC_CRC_DEL;
757 break;
758 default:
759 iowrite32(status | PCH_LEC_ALL, &priv->regs->stat);
760 break;
761 }
762
763 }
764
765 priv->can.state = state;
766 netif_rx(skb);
767
768 stats->rx_packets++;
769 stats->rx_bytes += cf->can_dlc;
770}
771
772static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
773{
774 struct net_device *ndev = (struct net_device *)dev_id;
775 struct pch_can_priv *priv = netdev_priv(ndev);
776
777 pch_can_set_int_enables(priv, PCH_CAN_NONE);
778
779 napi_schedule(&priv->napi);
780
781 return IRQ_HANDLED;
782}
783
784static int pch_can_rx_normal(struct net_device *ndev, u32 int_stat)
785{
786 u32 reg;
787 canid_t id;
788 u32 ide;
789 u32 rtr;
790 int i, j, k;
791 int rcv_pkts = 0;
792 struct sk_buff *skb;
793 struct can_frame *cf;
794 struct pch_can_priv *priv = netdev_priv(ndev);
795 struct net_device_stats *stats = &(priv->ndev->stats);
796
797 /* Reading the messsage object from the Message RAM */
798 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
799 pch_can_check_if_busy(&priv->regs->if1_creq, int_stat);
800
801 /* Reading the MCONT register. */
802 reg = ioread32(&priv->regs->if1_mcont);
803 reg &= 0xffff;
804
805 for (k = int_stat; !(reg & CAN_IF_MCONT_EOB); k++) {
806 /* If MsgLost bit set. */
807 if (reg & CAN_IF_MCONT_MSGLOST) {
808 dev_err(&priv->ndev->dev, "Msg Obj is overwritten.\n");
809 pch_can_bit_clear(&priv->regs->if1_mcont,
810 CAN_IF_MCONT_MSGLOST);
811 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL,
812 &priv->regs->if1_cmask);
813 pch_can_check_if_busy(&priv->regs->if1_creq, k);
814
815 skb = alloc_can_err_skb(ndev, &cf);
816 if (!skb)
817 return -ENOMEM;
818
819 priv->can.can_stats.error_passive++;
820 priv->can.state = CAN_STATE_ERROR_PASSIVE;
821 cf->can_id |= CAN_ERR_CRTL;
822 cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
823 cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
824 stats->rx_packets++;
825 stats->rx_bytes += cf->can_dlc;
826
827 netif_receive_skb(skb);
828 rcv_pkts++;
829 goto RX_NEXT;
830 }
831 if (!(reg & CAN_IF_MCONT_NEWDAT))
832 goto RX_NEXT;
833
834 skb = alloc_can_skb(priv->ndev, &cf);
835 if (!skb)
836 return -ENOMEM;
837
838 /* Get Received data */
839 ide = ((ioread32(&priv->regs->if1_id2)) & CAN_ID2_XTD) >> 14;
840 if (ide) {
841 id = (ioread32(&priv->regs->if1_id1) & 0xffff);
842 id |= (((ioread32(&priv->regs->if1_id2)) &
843 0x1fff) << 16);
844 cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
845 } else {
846 id = (((ioread32(&priv->regs->if1_id2)) &
847 (CAN_SFF_MASK << 2)) >> 2);
848 cf->can_id = (id & CAN_SFF_MASK);
849 }
850
851 rtr = (ioread32(&priv->regs->if1_id2) & CAN_ID2_DIR);
852 if (rtr) {
853 cf->can_dlc = 0;
854 cf->can_id |= CAN_RTR_FLAG;
855 } else {
856 cf->can_dlc = ((ioread32(&priv->regs->if1_mcont)) &
857 0x0f);
858 }
859
860 for (i = 0, j = 0; i < cf->can_dlc; j++) {
861 reg = ioread32(&priv->regs->if1_dataa1 + j*4);
862 cf->data[i++] = cpu_to_le32(reg & 0xff);
863 if (i == cf->can_dlc)
864 break;
865 cf->data[i++] = cpu_to_le32((reg >> 8) & 0xff);
866 }
867
868 netif_receive_skb(skb);
869 rcv_pkts++;
870 stats->rx_packets++;
871 stats->rx_bytes += cf->can_dlc;
872
873 if (k < PCH_FIFO_THRESH) {
874 iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL |
875 CAN_CMASK_ARB, &priv->regs->if1_cmask);
876
877 /* Clearing the Dir bit. */
878 pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID2_DIR);
879
880 /* Clearing NewDat & IntPnd */
881 pch_can_bit_clear(&priv->regs->if1_mcont,
882 CAN_IF_MCONT_INTPND);
883 pch_can_check_if_busy(&priv->regs->if1_creq, k);
884 } else if (k > PCH_FIFO_THRESH) {
885 pch_can_int_clr(priv, k);
886 } else if (k == PCH_FIFO_THRESH) {
887 int cnt;
888 for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++)
889 pch_can_int_clr(priv, cnt+1);
890 }
891RX_NEXT:
892 /* Reading the messsage object from the Message RAM */
893 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
894 pch_can_check_if_busy(&priv->regs->if1_creq, k + 1);
895 reg = ioread32(&priv->regs->if1_mcont);
896 }
897
898 return rcv_pkts;
899}
900static int pch_can_rx_poll(struct napi_struct *napi, int quota)
901{
902 struct net_device *ndev = napi->dev;
903 struct pch_can_priv *priv = netdev_priv(ndev);
904 struct net_device_stats *stats = &(priv->ndev->stats);
905 u32 dlc;
906 u32 int_stat;
907 int rcv_pkts = 0;
908 u32 reg_stat;
909 unsigned long flags;
910
911 int_stat = pch_can_int_pending(priv);
912 if (!int_stat)
913 return 0;
914
915INT_STAT:
916 if (int_stat == CAN_STATUS_INT) {
917 reg_stat = ioread32(&priv->regs->stat);
918 if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) {
919 if ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)
920 pch_can_error(ndev, reg_stat);
921 }
922
923 if (reg_stat & PCH_TX_OK) {
924 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
925 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
926 pch_can_check_if_busy(&priv->regs->if2_creq,
927 ioread32(&priv->regs->intr));
928 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
929 pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK);
930 }
931
932 if (reg_stat & PCH_RX_OK)
933 pch_can_bit_clear(&priv->regs->stat, PCH_RX_OK);
934
935 int_stat = pch_can_int_pending(priv);
936 if (int_stat == CAN_STATUS_INT)
937 goto INT_STAT;
938 }
939
940MSG_OBJ:
941 if ((int_stat >= 1) && (int_stat <= PCH_RX_OBJ_NUM)) {
942 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
943 rcv_pkts = pch_can_rx_normal(ndev, int_stat);
944 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
945 if (rcv_pkts < 0)
946 return 0;
947 } else if ((int_stat > PCH_RX_OBJ_NUM) && (int_stat <= PCH_OBJ_NUM)) {
948 if (priv->msg_obj[int_stat - 1] == MSG_OBJ_TX) {
949 /* Handle transmission interrupt */
950 can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_NUM - 1);
951 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
952 iowrite32(CAN_CMASK_RX_TX_GET | CAN_CMASK_CLRINTPND,
953 &priv->regs->if2_cmask);
954 dlc = ioread32(&priv->regs->if2_mcont) &
955 CAN_IF_MCONT_DLC;
956 pch_can_check_if_busy(&priv->regs->if2_creq, int_stat);
957 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
958 if (dlc > 8)
959 dlc = 8;
960 stats->tx_bytes += dlc;
961 stats->tx_packets++;
962 }
963 }
964
965 int_stat = pch_can_int_pending(priv);
966 if (int_stat == CAN_STATUS_INT)
967 goto INT_STAT;
968 else if (int_stat >= 1 && int_stat <= 32)
969 goto MSG_OBJ;
970
971 napi_complete(napi);
972 pch_can_set_int_enables(priv, PCH_CAN_ALL);
973
974 return rcv_pkts;
975}
976
977static int pch_set_bittiming(struct net_device *ndev)
978{
979 struct pch_can_priv *priv = netdev_priv(ndev);
980 const struct can_bittiming *bt = &priv->can.bittiming;
981 u32 canbit;
982 u32 bepe;
983 u32 brp;
984
985 /* Setting the CCE bit for accessing the Can Timing register. */
986 pch_can_bit_set(&priv->regs->cont, CAN_CTRL_CCE);
987
988 brp = (bt->tq) / (1000000000/PCH_CAN_CLK) - 1;
989 canbit = brp & MSK_BITT_BRP;
990 canbit |= (bt->sjw - 1) << BIT_BITT_SJW;
991 canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << BIT_BITT_TSEG1;
992 canbit |= (bt->phase_seg2 - 1) << BIT_BITT_TSEG2;
993 bepe = (brp & MSK_BRPE_BRPE) >> BIT_BRPE_BRPE;
994 iowrite32(canbit, &priv->regs->bitt);
995 iowrite32(bepe, &priv->regs->brpe);
996 pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_CCE);
997
998 return 0;
999}
1000
1001static void pch_can_start(struct net_device *ndev)
1002{
1003 struct pch_can_priv *priv = netdev_priv(ndev);
1004
1005 if (priv->can.state != CAN_STATE_STOPPED)
1006 pch_can_reset(priv);
1007
1008 pch_set_bittiming(ndev);
1009 pch_can_set_optmode(priv);
1010
1011 pch_can_tx_enable_all(priv);
1012 pch_can_rx_enable_all(priv);
1013
1014 /* Setting the CAN to run mode. */
1015 pch_can_set_run_mode(priv, PCH_CAN_RUN);
1016
1017 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1018
1019 return;
1020}
1021
1022static int pch_can_do_set_mode(struct net_device *ndev, enum can_mode mode)
1023{
1024 int ret = 0;
1025
1026 switch (mode) {
1027 case CAN_MODE_START:
1028 pch_can_start(ndev);
1029 netif_wake_queue(ndev);
1030 break;
1031 default:
1032 ret = -EOPNOTSUPP;
1033 break;
1034 }
1035
1036 return ret;
1037}
1038
1039static int pch_can_open(struct net_device *ndev)
1040{
1041 struct pch_can_priv *priv = netdev_priv(ndev);
1042 int retval;
1043
1044 retval = pci_enable_msi(priv->dev);
1045 if (retval) {
1046 dev_info(&ndev->dev, "PCH CAN opened without MSI\n");
1047 priv->use_msi = 0;
1048 } else {
1049 dev_info(&ndev->dev, "PCH CAN opened with MSI\n");
1050 priv->use_msi = 1;
1051 }
1052
1053 /* Regsitering the interrupt. */
1054 retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED,
1055 ndev->name, ndev);
1056 if (retval) {
1057 dev_err(&ndev->dev, "request_irq failed.\n");
1058 goto req_irq_err;
1059 }
1060
1061 /* Open common can device */
1062 retval = open_candev(ndev);
1063 if (retval) {
1064 dev_err(ndev->dev.parent, "open_candev() failed %d\n", retval);
1065 goto err_open_candev;
1066 }
1067
1068 pch_can_init(priv);
1069 pch_can_start(ndev);
1070 napi_enable(&priv->napi);
1071 netif_start_queue(ndev);
1072
1073 return 0;
1074
1075err_open_candev:
1076 free_irq(priv->dev->irq, ndev);
1077req_irq_err:
1078 if (priv->use_msi)
1079 pci_disable_msi(priv->dev);
1080
1081 pch_can_release(priv);
1082
1083 return retval;
1084}
1085
1086static int pch_close(struct net_device *ndev)
1087{
1088 struct pch_can_priv *priv = netdev_priv(ndev);
1089
1090 netif_stop_queue(ndev);
1091 napi_disable(&priv->napi);
1092 pch_can_release(priv);
1093 free_irq(priv->dev->irq, ndev);
1094 if (priv->use_msi)
1095 pci_disable_msi(priv->dev);
1096 close_candev(ndev);
1097 priv->can.state = CAN_STATE_STOPPED;
1098 return 0;
1099}
1100
1101static int pch_get_msg_obj_sts(struct net_device *ndev, u32 obj_id)
1102{
1103 u32 buffer_status = 0;
1104 struct pch_can_priv *priv = netdev_priv(ndev);
1105
1106 /* Getting the message object status. */
1107 buffer_status = (u32) pch_can_get_buffer_status(priv);
1108
1109 return buffer_status & obj_id;
1110}
1111
1112
1113static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
1114{
1115 int i, j;
1116 unsigned long flags;
1117 struct pch_can_priv *priv = netdev_priv(ndev);
1118 struct can_frame *cf = (struct can_frame *)skb->data;
1119 int tx_buffer_avail = 0;
1120
1121 if (can_dropped_invalid_skb(ndev, skb))
1122 return NETDEV_TX_OK;
1123
1124 if (priv->tx_obj == (PCH_OBJ_NUM + 1)) { /* Point tail Obj */
1125 while (pch_get_msg_obj_sts(ndev, (((1 << PCH_TX_OBJ_NUM)-1) <<
1126 PCH_RX_OBJ_NUM)))
1127 udelay(500);
1128
1129 priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj ID */
1130 tx_buffer_avail = priv->tx_obj; /* Point Tail of Tx Obj */
1131 } else {
1132 tx_buffer_avail = priv->tx_obj;
1133 }
1134 priv->tx_obj++;
1135
1136 /* Attaining the lock. */
1137 spin_lock_irqsave(&priv->msgif_reg_lock, flags);
1138
1139 /* Reading the Msg Obj from the Msg RAM to the Interface register. */
1140 iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
1141 pch_can_check_if_busy(&priv->regs->if2_creq, tx_buffer_avail);
1142
1143 /* Setting the CMASK register. */
1144 pch_can_bit_set(&priv->regs->if2_cmask, CAN_CMASK_ALL);
1145
1146 /* If ID extended is set. */
1147 pch_can_bit_clear(&priv->regs->if2_id1, 0xffff);
1148 pch_can_bit_clear(&priv->regs->if2_id2, 0x1fff | CAN_ID2_XTD);
1149 if (cf->can_id & CAN_EFF_FLAG) {
1150 pch_can_bit_set(&priv->regs->if2_id1, cf->can_id & 0xffff);
1151 pch_can_bit_set(&priv->regs->if2_id2,
1152 ((cf->can_id >> 16) & 0x1fff) | CAN_ID2_XTD);
1153 } else {
1154 pch_can_bit_set(&priv->regs->if2_id1, 0);
1155 pch_can_bit_set(&priv->regs->if2_id2,
1156 (cf->can_id & CAN_SFF_MASK) << 2);
1157 }
1158
1159 /* If remote frame has to be transmitted.. */
1160 if (cf->can_id & CAN_RTR_FLAG)
1161 pch_can_bit_clear(&priv->regs->if2_id2, CAN_ID2_DIR);
1162
1163 for (i = 0, j = 0; i < cf->can_dlc; j++) {
1164 iowrite32(le32_to_cpu(cf->data[i++]),
1165 (&priv->regs->if2_dataa1) + j*4);
1166 if (i == cf->can_dlc)
1167 break;
1168 iowrite32(le32_to_cpu(cf->data[i++] << 8),
1169 (&priv->regs->if2_dataa1) + j*4);
1170 }
1171
1172 can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_NUM - 1);
1173
1174 /* Updating the size of the data. */
1175 pch_can_bit_clear(&priv->regs->if2_mcont, 0x0f);
1176 pch_can_bit_set(&priv->regs->if2_mcont, cf->can_dlc);
1177
1178 /* Clearing IntPend, NewDat & TxRqst */
1179 pch_can_bit_clear(&priv->regs->if2_mcont,
1180 CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND |
1181 CAN_IF_MCONT_TXRQXT);
1182
1183 /* Setting NewDat, TxRqst bits */
1184 pch_can_bit_set(&priv->regs->if2_mcont,
1185 CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_TXRQXT);
1186
1187 pch_can_check_if_busy(&priv->regs->if2_creq, tx_buffer_avail);
1188
1189 spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
1190
1191 return NETDEV_TX_OK;
1192}
1193
1194static const struct net_device_ops pch_can_netdev_ops = {
1195 .ndo_open = pch_can_open,
1196 .ndo_stop = pch_close,
1197 .ndo_start_xmit = pch_xmit,
1198};
1199
1200static void __devexit pch_can_remove(struct pci_dev *pdev)
1201{
1202 struct net_device *ndev = pci_get_drvdata(pdev);
1203 struct pch_can_priv *priv = netdev_priv(ndev);
1204
1205 unregister_candev(priv->ndev);
1206 free_candev(priv->ndev);
1207 pci_iounmap(pdev, priv->regs);
1208 pci_release_regions(pdev);
1209 pci_disable_device(pdev);
1210 pci_set_drvdata(pdev, NULL);
1211 pch_can_reset(priv);
1212}
1213
1214#ifdef CONFIG_PM
1215static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state)
1216{
1217 int i; /* Counter variable. */
1218 int retval; /* Return value. */
1219 u32 buf_stat; /* Variable for reading the transmit buffer status. */
1220 u32 counter = 0xFFFFFF;
1221
1222 struct net_device *dev = pci_get_drvdata(pdev);
1223 struct pch_can_priv *priv = netdev_priv(dev);
1224
1225 /* Stop the CAN controller */
1226 pch_can_set_run_mode(priv, PCH_CAN_STOP);
1227
1228 /* Indicate that we are aboutto/in suspend */
1229 priv->can.state = CAN_STATE_SLEEPING;
1230
1231 /* Waiting for all transmission to complete. */
1232 while (counter) {
1233 buf_stat = pch_can_get_buffer_status(priv);
1234 if (!buf_stat)
1235 break;
1236 counter--;
1237 udelay(1);
1238 }
1239 if (!counter)
1240 dev_err(&pdev->dev, "%s -> Transmission time out.\n", __func__);
1241
1242 /* Save interrupt configuration and then disable them */
1243 pch_can_get_int_enables(priv, &(priv->int_enables));
1244 pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
1245
1246 /* Save Tx buffer enable state */
1247 for (i = 0; i < PCH_OBJ_NUM; i++) {
1248 if (priv->msg_obj[i] == MSG_OBJ_TX)
1249 pch_can_get_tx_enable(priv, i + 1,
1250 &(priv->tx_enable[i]));
1251 }
1252
1253 /* Disable all Transmit buffers */
1254 pch_can_tx_disable_all(priv);
1255
1256 /* Save Rx buffer enable state */
1257 for (i = 0; i < PCH_OBJ_NUM; i++) {
1258 if (priv->msg_obj[i] == MSG_OBJ_RX) {
1259 pch_can_get_rx_enable(priv, i + 1,
1260 &(priv->rx_enable[i]));
1261 pch_can_get_rx_buffer_link(priv, i + 1,
1262 &(priv->rx_link[i]));
1263 }
1264 }
1265
1266 /* Disable all Receive buffers */
1267 pch_can_rx_disable_all(priv);
1268 retval = pci_save_state(pdev);
1269 if (retval) {
1270 dev_err(&pdev->dev, "pci_save_state failed.\n");
1271 } else {
1272 pci_enable_wake(pdev, PCI_D3hot, 0);
1273 pci_disable_device(pdev);
1274 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1275 }
1276
1277 return retval;
1278}
1279
1280static int pch_can_resume(struct pci_dev *pdev)
1281{
1282 int i; /* Counter variable. */
1283 int retval; /* Return variable. */
1284 struct net_device *dev = pci_get_drvdata(pdev);
1285 struct pch_can_priv *priv = netdev_priv(dev);
1286
1287 pci_set_power_state(pdev, PCI_D0);
1288 pci_restore_state(pdev);
1289 retval = pci_enable_device(pdev);
1290 if (retval) {
1291 dev_err(&pdev->dev, "pci_enable_device failed.\n");
1292 return retval;
1293 }
1294
1295 pci_enable_wake(pdev, PCI_D3hot, 0);
1296
1297 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1298
1299 /* Disabling all interrupts. */
1300 pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
1301
1302 /* Setting the CAN device in Stop Mode. */
1303 pch_can_set_run_mode(priv, PCH_CAN_STOP);
1304
1305 /* Configuring the transmit and receive buffers. */
1306 pch_can_config_rx_tx_buffers(priv);
1307
1308 /* Restore the CAN state */
1309 pch_set_bittiming(dev);
1310
1311 /* Listen/Active */
1312 pch_can_set_optmode(priv);
1313
1314 /* Enabling the transmit buffer. */
1315 for (i = 0; i < PCH_OBJ_NUM; i++) {
1316 if (priv->msg_obj[i] == MSG_OBJ_TX) {
1317 pch_can_set_tx_enable(priv, i + 1,
1318 priv->tx_enable[i]);
1319 }
1320 }
1321
1322 /* Configuring the receive buffer and enabling them. */
1323 for (i = 0; i < PCH_OBJ_NUM; i++) {
1324 if (priv->msg_obj[i] == MSG_OBJ_RX) {
1325 /* Restore buffer link */
1326 pch_can_set_rx_buffer_link(priv, i + 1,
1327 priv->rx_link[i]);
1328
1329 /* Restore buffer enables */
1330 pch_can_set_rx_enable(priv, i + 1, priv->rx_enable[i]);
1331 }
1332 }
1333
1334 /* Enable CAN Interrupts */
1335 pch_can_set_int_custom(priv);
1336
1337 /* Restore Run Mode */
1338 pch_can_set_run_mode(priv, PCH_CAN_RUN);
1339
1340 return retval;
1341}
1342#else
1343#define pch_can_suspend NULL
1344#define pch_can_resume NULL
1345#endif
1346
1347static int pch_can_get_berr_counter(const struct net_device *dev,
1348 struct can_berr_counter *bec)
1349{
1350 struct pch_can_priv *priv = netdev_priv(dev);
1351
1352 bec->txerr = ioread32(&priv->regs->errc) & CAN_TEC;
1353 bec->rxerr = (ioread32(&priv->regs->errc) & CAN_REC) >> 8;
1354
1355 return 0;
1356}
1357
1358static int __devinit pch_can_probe(struct pci_dev *pdev,
1359 const struct pci_device_id *id)
1360{
1361 struct net_device *ndev;
1362 struct pch_can_priv *priv;
1363 int rc;
1364 int index;
1365 void __iomem *addr;
1366
1367 rc = pci_enable_device(pdev);
1368 if (rc) {
1369 dev_err(&pdev->dev, "Failed pci_enable_device %d\n", rc);
1370 goto probe_exit_endev;
1371 }
1372
1373 rc = pci_request_regions(pdev, KBUILD_MODNAME);
1374 if (rc) {
1375 dev_err(&pdev->dev, "Failed pci_request_regions %d\n", rc);
1376 goto probe_exit_pcireq;
1377 }
1378
1379 addr = pci_iomap(pdev, 1, 0);
1380 if (!addr) {
1381 rc = -EIO;
1382 dev_err(&pdev->dev, "Failed pci_iomap\n");
1383 goto probe_exit_ipmap;
1384 }
1385
1386 ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_NUM);
1387 if (!ndev) {
1388 rc = -ENOMEM;
1389 dev_err(&pdev->dev, "Failed alloc_candev\n");
1390 goto probe_exit_alloc_candev;
1391 }
1392
1393 priv = netdev_priv(ndev);
1394 priv->ndev = ndev;
1395 priv->regs = addr;
1396 priv->dev = pdev;
1397 priv->can.bittiming_const = &pch_can_bittiming_const;
1398 priv->can.do_set_mode = pch_can_do_set_mode;
1399 priv->can.do_get_berr_counter = pch_can_get_berr_counter;
1400 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
1401 CAN_CTRLMODE_LOOPBACK;
1402 priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj */
1403
1404 ndev->irq = pdev->irq;
1405 ndev->flags |= IFF_ECHO;
1406
1407 pci_set_drvdata(pdev, ndev);
1408 SET_NETDEV_DEV(ndev, &pdev->dev);
1409 ndev->netdev_ops = &pch_can_netdev_ops;
1410
1411 priv->can.clock.freq = PCH_CAN_CLK; /* Hz */
1412 for (index = 0; index < PCH_RX_OBJ_NUM;)
1413 priv->msg_obj[index++] = MSG_OBJ_RX;
1414
1415 for (index = index; index < PCH_OBJ_NUM;)
1416 priv->msg_obj[index++] = MSG_OBJ_TX;
1417
1418 netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_NUM);
1419
1420 rc = register_candev(ndev);
1421 if (rc) {
1422 dev_err(&pdev->dev, "Failed register_candev %d\n", rc);
1423 goto probe_exit_reg_candev;
1424 }
1425
1426 return 0;
1427
1428probe_exit_reg_candev:
1429 free_candev(ndev);
1430probe_exit_alloc_candev:
1431 pci_iounmap(pdev, addr);
1432probe_exit_ipmap:
1433 pci_release_regions(pdev);
1434probe_exit_pcireq:
1435 pci_disable_device(pdev);
1436probe_exit_endev:
1437 return rc;
1438}
1439
1440static struct pci_driver pch_can_pcidev = {
1441 .name = "pch_can",
1442 .id_table = pch_pci_tbl,
1443 .probe = pch_can_probe,
1444 .remove = __devexit_p(pch_can_remove),
1445 .suspend = pch_can_suspend,
1446 .resume = pch_can_resume,
1447};
1448
1449static int __init pch_can_pci_init(void)
1450{
1451 return pci_register_driver(&pch_can_pcidev);
1452}
1453module_init(pch_can_pci_init);
1454
1455static void __exit pch_can_pci_exit(void)
1456{
1457 pci_unregister_driver(&pch_can_pcidev);
1458}
1459module_exit(pch_can_pci_exit);
1460
1461MODULE_DESCRIPTION("Controller Area Network Driver");
1462MODULE_LICENSE("GPL v2");
1463MODULE_VERSION("0.94");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-01 05:39:25 -0400