Commit | Line | Data |
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b21d18b5 MO |
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 | ||
086b5650 T |
35 | #define PCH_ENABLE 1 /* The enable flag */ |
36 | #define PCH_DISABLE 0 /* The disable flag */ | |
0a80410d T |
37 | #define PCH_CTRL_INIT BIT(0) /* The INIT bit of CANCONT register. */ |
38 | #define PCH_CTRL_IE BIT(1) /* The IE bit of CAN control register */ | |
39 | #define PCH_CTRL_IE_SIE_EIE (BIT(3) | BIT(2) | BIT(1)) | |
40 | #define PCH_CTRL_CCE BIT(6) | |
41 | #define PCH_CTRL_OPT BIT(7) /* The OPT bit of CANCONT register. */ | |
42 | #define PCH_OPT_SILENT BIT(3) /* The Silent bit of CANOPT reg. */ | |
43 | #define PCH_OPT_LBACK BIT(4) /* The LoopBack bit of CANOPT reg. */ | |
44 | ||
086b5650 T |
45 | #define PCH_CMASK_RX_TX_SET 0x00f3 |
46 | #define PCH_CMASK_RX_TX_GET 0x0073 | |
47 | #define PCH_CMASK_ALL 0xff | |
0a80410d T |
48 | #define PCH_CMASK_NEWDAT BIT(2) |
49 | #define PCH_CMASK_CLRINTPND BIT(3) | |
50 | #define PCH_CMASK_CTRL BIT(4) | |
51 | #define PCH_CMASK_ARB BIT(5) | |
52 | #define PCH_CMASK_MASK BIT(6) | |
53 | #define PCH_CMASK_RDWR BIT(7) | |
54 | #define PCH_IF_MCONT_NEWDAT BIT(15) | |
55 | #define PCH_IF_MCONT_MSGLOST BIT(14) | |
56 | #define PCH_IF_MCONT_INTPND BIT(13) | |
57 | #define PCH_IF_MCONT_UMASK BIT(12) | |
58 | #define PCH_IF_MCONT_TXIE BIT(11) | |
59 | #define PCH_IF_MCONT_RXIE BIT(10) | |
60 | #define PCH_IF_MCONT_RMTEN BIT(9) | |
61 | #define PCH_IF_MCONT_TXRQXT BIT(8) | |
62 | #define PCH_IF_MCONT_EOB BIT(7) | |
63 | #define PCH_IF_MCONT_DLC (BIT(0) | BIT(1) | BIT(2) | BIT(3)) | |
64 | #define PCH_MASK2_MDIR_MXTD (BIT(14) | BIT(15)) | |
65 | #define PCH_ID2_DIR BIT(13) | |
66 | #define PCH_ID2_XTD BIT(14) | |
67 | #define PCH_ID_MSGVAL BIT(15) | |
68 | #define PCH_IF_CREQ_BUSY BIT(15) | |
086b5650 T |
69 | |
70 | #define PCH_STATUS_INT 0x8000 | |
71 | #define PCH_REC 0x00007f00 | |
72 | #define PCH_TEC 0x000000ff | |
b21d18b5 | 73 | |
0a80410d T |
74 | #define PCH_TX_OK BIT(3) |
75 | #define PCH_RX_OK BIT(4) | |
76 | #define PCH_EPASSIV BIT(5) | |
77 | #define PCH_EWARN BIT(6) | |
78 | #define PCH_BUS_OFF BIT(7) | |
b21d18b5 MO |
79 | |
80 | /* bit position of certain controller bits. */ | |
086b5650 T |
81 | #define PCH_BIT_BRP 0 |
82 | #define PCH_BIT_SJW 6 | |
83 | #define PCH_BIT_TSEG1 8 | |
84 | #define PCH_BIT_TSEG2 12 | |
85 | #define PCH_BIT_BRPE_BRPE 6 | |
86 | #define PCH_MSK_BITT_BRP 0x3f | |
87 | #define PCH_MSK_BRPE_BRPE 0x3c0 | |
88 | #define PCH_MSK_CTRL_IE_SIE_EIE 0x07 | |
89 | #define PCH_COUNTER_LIMIT 10 | |
b21d18b5 MO |
90 | |
91 | #define PCH_CAN_CLK 50000000 /* 50MHz */ | |
92 | ||
93 | /* Define the number of message object. | |
94 | * PCH CAN communications are done via Message RAM. | |
95 | * The Message RAM consists of 32 message objects. */ | |
15ffc8fd T |
96 | #define PCH_RX_OBJ_NUM 26 |
97 | #define PCH_TX_OBJ_NUM 6 | |
98 | #define PCH_RX_OBJ_START 1 | |
99 | #define PCH_RX_OBJ_END PCH_RX_OBJ_NUM | |
100 | #define PCH_TX_OBJ_START (PCH_RX_OBJ_END + 1) | |
101 | #define PCH_TX_OBJ_END (PCH_RX_OBJ_NUM + PCH_TX_OBJ_NUM) | |
b21d18b5 MO |
102 | |
103 | #define PCH_FIFO_THRESH 16 | |
104 | ||
76d94b23 T |
105 | /* TxRqst2 show status of MsgObjNo.17~32 */ |
106 | #define PCH_TREQ2_TX_MASK (((1 << PCH_TX_OBJ_NUM) - 1) <<\ | |
107 | (PCH_RX_OBJ_END - 16)) | |
108 | ||
8339a7ed T |
109 | enum pch_ifreg { |
110 | PCH_RX_IFREG, | |
111 | PCH_TX_IFREG, | |
112 | }; | |
113 | ||
d68f6837 T |
114 | enum pch_can_err { |
115 | PCH_STUF_ERR = 1, | |
116 | PCH_FORM_ERR, | |
117 | PCH_ACK_ERR, | |
118 | PCH_BIT1_ERR, | |
119 | PCH_BIT0_ERR, | |
120 | PCH_CRC_ERR, | |
121 | PCH_LEC_ALL, | |
122 | }; | |
123 | ||
b21d18b5 MO |
124 | enum pch_can_mode { |
125 | PCH_CAN_ENABLE, | |
126 | PCH_CAN_DISABLE, | |
127 | PCH_CAN_ALL, | |
128 | PCH_CAN_NONE, | |
129 | PCH_CAN_STOP, | |
130 | PCH_CAN_RUN | |
131 | }; | |
132 | ||
8339a7ed T |
133 | struct pch_can_if_regs { |
134 | u32 creq; | |
135 | u32 cmask; | |
136 | u32 mask1; | |
137 | u32 mask2; | |
138 | u32 id1; | |
139 | u32 id2; | |
140 | u32 mcont; | |
8ac9702b | 141 | u32 data[4]; |
8339a7ed T |
142 | u32 rsv[13]; |
143 | }; | |
144 | ||
b21d18b5 MO |
145 | struct pch_can_regs { |
146 | u32 cont; | |
147 | u32 stat; | |
148 | u32 errc; | |
149 | u32 bitt; | |
150 | u32 intr; | |
151 | u32 opt; | |
152 | u32 brpe; | |
8339a7ed T |
153 | u32 reserve; |
154 | struct pch_can_if_regs ifregs[2]; /* [0]=if1 [1]=if2 */ | |
155 | u32 reserve1[8]; | |
b21d18b5 MO |
156 | u32 treq1; |
157 | u32 treq2; | |
8339a7ed T |
158 | u32 reserve2[6]; |
159 | u32 data1; | |
160 | u32 data2; | |
161 | u32 reserve3[6]; | |
162 | u32 canipend1; | |
163 | u32 canipend2; | |
164 | u32 reserve4[6]; | |
165 | u32 canmval1; | |
166 | u32 canmval2; | |
167 | u32 reserve5[37]; | |
b21d18b5 MO |
168 | u32 srst; |
169 | }; | |
170 | ||
171 | struct pch_can_priv { | |
172 | struct can_priv can; | |
173 | unsigned int can_num; | |
174 | struct pci_dev *dev; | |
15ffc8fd T |
175 | int tx_enable[PCH_TX_OBJ_END]; |
176 | int rx_enable[PCH_TX_OBJ_END]; | |
177 | int rx_link[PCH_TX_OBJ_END]; | |
b21d18b5 MO |
178 | unsigned int int_enables; |
179 | unsigned int int_stat; | |
180 | struct net_device *ndev; | |
15ffc8fd | 181 | unsigned int msg_obj[PCH_TX_OBJ_END]; |
b21d18b5 MO |
182 | struct pch_can_regs __iomem *regs; |
183 | struct napi_struct napi; | |
184 | unsigned int tx_obj; /* Point next Tx Obj index */ | |
185 | unsigned int use_msi; | |
186 | }; | |
187 | ||
188 | static struct can_bittiming_const pch_can_bittiming_const = { | |
189 | .name = KBUILD_MODNAME, | |
190 | .tseg1_min = 1, | |
191 | .tseg1_max = 16, | |
192 | .tseg2_min = 1, | |
193 | .tseg2_max = 8, | |
194 | .sjw_max = 4, | |
195 | .brp_min = 1, | |
196 | .brp_max = 1024, /* 6bit + extended 4bit */ | |
197 | .brp_inc = 1, | |
198 | }; | |
199 | ||
200 | static DEFINE_PCI_DEVICE_TABLE(pch_pci_tbl) = { | |
201 | {PCI_VENDOR_ID_INTEL, 0x8818, PCI_ANY_ID, PCI_ANY_ID,}, | |
202 | {0,} | |
203 | }; | |
204 | MODULE_DEVICE_TABLE(pci, pch_pci_tbl); | |
205 | ||
526de53c | 206 | static inline void pch_can_bit_set(void __iomem *addr, u32 mask) |
b21d18b5 MO |
207 | { |
208 | iowrite32(ioread32(addr) | mask, addr); | |
209 | } | |
210 | ||
526de53c | 211 | static inline void pch_can_bit_clear(void __iomem *addr, u32 mask) |
b21d18b5 MO |
212 | { |
213 | iowrite32(ioread32(addr) & ~mask, addr); | |
214 | } | |
215 | ||
216 | static void pch_can_set_run_mode(struct pch_can_priv *priv, | |
217 | enum pch_can_mode mode) | |
218 | { | |
219 | switch (mode) { | |
220 | case PCH_CAN_RUN: | |
086b5650 | 221 | pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_INIT); |
b21d18b5 MO |
222 | break; |
223 | ||
224 | case PCH_CAN_STOP: | |
086b5650 | 225 | pch_can_bit_set(&priv->regs->cont, PCH_CTRL_INIT); |
b21d18b5 MO |
226 | break; |
227 | ||
228 | default: | |
229 | dev_err(&priv->ndev->dev, "%s -> Invalid Mode.\n", __func__); | |
230 | break; | |
231 | } | |
232 | } | |
233 | ||
234 | static void pch_can_set_optmode(struct pch_can_priv *priv) | |
235 | { | |
236 | u32 reg_val = ioread32(&priv->regs->opt); | |
237 | ||
238 | if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) | |
086b5650 | 239 | reg_val |= PCH_OPT_SILENT; |
b21d18b5 MO |
240 | |
241 | if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) | |
086b5650 | 242 | reg_val |= PCH_OPT_LBACK; |
b21d18b5 | 243 | |
086b5650 | 244 | pch_can_bit_set(&priv->regs->cont, PCH_CTRL_OPT); |
b21d18b5 MO |
245 | iowrite32(reg_val, &priv->regs->opt); |
246 | } | |
247 | ||
248 | static void pch_can_set_int_custom(struct pch_can_priv *priv) | |
249 | { | |
250 | /* Clearing the IE, SIE and EIE bits of Can control register. */ | |
086b5650 | 251 | pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE); |
b21d18b5 MO |
252 | |
253 | /* Appropriately setting them. */ | |
254 | pch_can_bit_set(&priv->regs->cont, | |
086b5650 | 255 | ((priv->int_enables & PCH_MSK_CTRL_IE_SIE_EIE) << 1)); |
b21d18b5 MO |
256 | } |
257 | ||
258 | /* This function retrieves interrupt enabled for the CAN device. */ | |
259 | static void pch_can_get_int_enables(struct pch_can_priv *priv, u32 *enables) | |
260 | { | |
261 | /* Obtaining the status of IE, SIE and EIE interrupt bits. */ | |
086b5650 | 262 | *enables = ((ioread32(&priv->regs->cont) & PCH_CTRL_IE_SIE_EIE) >> 1); |
b21d18b5 MO |
263 | } |
264 | ||
265 | static void pch_can_set_int_enables(struct pch_can_priv *priv, | |
266 | enum pch_can_mode interrupt_no) | |
267 | { | |
268 | switch (interrupt_no) { | |
269 | case PCH_CAN_ENABLE: | |
086b5650 | 270 | pch_can_bit_set(&priv->regs->cont, PCH_CTRL_IE); |
b21d18b5 MO |
271 | break; |
272 | ||
273 | case PCH_CAN_DISABLE: | |
086b5650 | 274 | pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE); |
b21d18b5 MO |
275 | break; |
276 | ||
277 | case PCH_CAN_ALL: | |
086b5650 | 278 | pch_can_bit_set(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE); |
b21d18b5 MO |
279 | break; |
280 | ||
281 | case PCH_CAN_NONE: | |
086b5650 | 282 | pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE); |
b21d18b5 MO |
283 | break; |
284 | ||
285 | default: | |
286 | dev_err(&priv->ndev->dev, "Invalid interrupt number.\n"); | |
287 | break; | |
288 | } | |
289 | } | |
290 | ||
291 | static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num) | |
292 | { | |
086b5650 | 293 | u32 counter = PCH_COUNTER_LIMIT; |
b21d18b5 MO |
294 | u32 ifx_creq; |
295 | ||
296 | iowrite32(num, creq_addr); | |
297 | while (counter) { | |
086b5650 | 298 | ifx_creq = ioread32(creq_addr) & PCH_IF_CREQ_BUSY; |
b21d18b5 MO |
299 | if (!ifx_creq) |
300 | break; | |
301 | counter--; | |
302 | udelay(1); | |
303 | } | |
304 | if (!counter) | |
305 | pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__); | |
306 | } | |
307 | ||
8339a7ed T |
308 | static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num, |
309 | u32 set, enum pch_ifreg dir) | |
b21d18b5 | 310 | { |
8339a7ed T |
311 | u32 ie; |
312 | ||
313 | if (dir) | |
314 | ie = PCH_IF_MCONT_TXIE; | |
315 | else | |
316 | ie = PCH_IF_MCONT_RXIE; | |
b21d18b5 | 317 | |
b21d18b5 | 318 | /* Reading the receive buffer data from RAM to Interface1 registers */ |
8339a7ed T |
319 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask); |
320 | pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num); | |
b21d18b5 MO |
321 | |
322 | /* Setting the IF1MASK1 register to access MsgVal and RxIE bits */ | |
086b5650 | 323 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_ARB | PCH_CMASK_CTRL, |
8339a7ed | 324 | &priv->regs->ifregs[dir].cmask); |
b21d18b5 | 325 | |
086b5650 | 326 | if (set == PCH_ENABLE) { |
b21d18b5 | 327 | /* Setting the MsgVal and RxIE bits */ |
8339a7ed T |
328 | pch_can_bit_set(&priv->regs->ifregs[dir].mcont, ie); |
329 | pch_can_bit_set(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL); | |
b21d18b5 | 330 | |
086b5650 | 331 | } else if (set == PCH_DISABLE) { |
b21d18b5 | 332 | /* Resetting the MsgVal and RxIE bits */ |
8339a7ed T |
333 | pch_can_bit_clear(&priv->regs->ifregs[dir].mcont, ie); |
334 | pch_can_bit_clear(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL); | |
b21d18b5 MO |
335 | } |
336 | ||
8339a7ed | 337 | pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num); |
b21d18b5 MO |
338 | } |
339 | ||
8339a7ed | 340 | static void pch_can_set_rx_all(struct pch_can_priv *priv, u32 set) |
b21d18b5 MO |
341 | { |
342 | int i; | |
343 | ||
344 | /* Traversing to obtain the object configured as receivers. */ | |
15ffc8fd T |
345 | for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) |
346 | pch_can_set_rxtx(priv, i, set, PCH_RX_IFREG); | |
b21d18b5 MO |
347 | } |
348 | ||
8339a7ed | 349 | static void pch_can_set_tx_all(struct pch_can_priv *priv, u32 set) |
b21d18b5 MO |
350 | { |
351 | int i; | |
352 | ||
353 | /* Traversing to obtain the object configured as transmit object. */ | |
15ffc8fd T |
354 | for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) |
355 | pch_can_set_rxtx(priv, i, set, PCH_TX_IFREG); | |
b21d18b5 MO |
356 | } |
357 | ||
8339a7ed T |
358 | static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num, |
359 | enum pch_ifreg dir) | |
b21d18b5 | 360 | { |
8339a7ed | 361 | u32 ie, enable; |
b21d18b5 | 362 | |
8339a7ed T |
363 | if (dir) |
364 | ie = PCH_IF_MCONT_RXIE; | |
b21d18b5 | 365 | else |
8339a7ed | 366 | ie = PCH_IF_MCONT_TXIE; |
b21d18b5 | 367 | |
8339a7ed T |
368 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask); |
369 | pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num); | |
b21d18b5 | 370 | |
8339a7ed T |
371 | if (((ioread32(&priv->regs->ifregs[dir].id2)) & PCH_ID_MSGVAL) && |
372 | ((ioread32(&priv->regs->ifregs[dir].mcont)) & ie)) { | |
15ffc8fd | 373 | enable = 1; |
b21d18b5 | 374 | } else { |
15ffc8fd | 375 | enable = 0; |
b21d18b5 | 376 | } |
8339a7ed | 377 | return enable; |
b21d18b5 MO |
378 | } |
379 | ||
380 | static int pch_can_int_pending(struct pch_can_priv *priv) | |
381 | { | |
382 | return ioread32(&priv->regs->intr) & 0xffff; | |
383 | } | |
384 | ||
385 | static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv, | |
386 | u32 buffer_num, u32 set) | |
387 | { | |
8339a7ed T |
388 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); |
389 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num); | |
390 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL, | |
391 | &priv->regs->ifregs[0].cmask); | |
086b5650 | 392 | if (set == PCH_ENABLE) |
8339a7ed T |
393 | pch_can_bit_clear(&priv->regs->ifregs[0].mcont, |
394 | PCH_IF_MCONT_EOB); | |
b21d18b5 | 395 | else |
8339a7ed | 396 | pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB); |
b21d18b5 | 397 | |
8339a7ed | 398 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num); |
b21d18b5 MO |
399 | } |
400 | ||
401 | static void pch_can_get_rx_buffer_link(struct pch_can_priv *priv, | |
402 | u32 buffer_num, u32 *link) | |
403 | { | |
8339a7ed T |
404 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); |
405 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num); | |
b21d18b5 | 406 | |
8339a7ed | 407 | if (ioread32(&priv->regs->ifregs[0].mcont) & PCH_IF_MCONT_EOB) |
086b5650 | 408 | *link = PCH_DISABLE; |
b21d18b5 | 409 | else |
086b5650 | 410 | *link = PCH_ENABLE; |
b21d18b5 MO |
411 | } |
412 | ||
413 | static void pch_can_clear_buffers(struct pch_can_priv *priv) | |
414 | { | |
415 | int i; | |
416 | ||
15ffc8fd | 417 | for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) { |
8339a7ed T |
418 | iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[0].cmask); |
419 | iowrite32(0xffff, &priv->regs->ifregs[0].mask1); | |
420 | iowrite32(0xffff, &priv->regs->ifregs[0].mask2); | |
421 | iowrite32(0x0, &priv->regs->ifregs[0].id1); | |
422 | iowrite32(0x0, &priv->regs->ifregs[0].id2); | |
423 | iowrite32(0x0, &priv->regs->ifregs[0].mcont); | |
8ac9702b T |
424 | iowrite32(0x0, &priv->regs->ifregs[0].data[0]); |
425 | iowrite32(0x0, &priv->regs->ifregs[0].data[1]); | |
426 | iowrite32(0x0, &priv->regs->ifregs[0].data[2]); | |
427 | iowrite32(0x0, &priv->regs->ifregs[0].data[3]); | |
086b5650 T |
428 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | |
429 | PCH_CMASK_ARB | PCH_CMASK_CTRL, | |
8339a7ed | 430 | &priv->regs->ifregs[0].cmask); |
15ffc8fd | 431 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i); |
b21d18b5 MO |
432 | } |
433 | ||
15ffc8fd | 434 | for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) { |
8339a7ed T |
435 | iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[1].cmask); |
436 | iowrite32(0xffff, &priv->regs->ifregs[1].mask1); | |
437 | iowrite32(0xffff, &priv->regs->ifregs[1].mask2); | |
438 | iowrite32(0x0, &priv->regs->ifregs[1].id1); | |
439 | iowrite32(0x0, &priv->regs->ifregs[1].id2); | |
440 | iowrite32(0x0, &priv->regs->ifregs[1].mcont); | |
8ac9702b T |
441 | iowrite32(0x0, &priv->regs->ifregs[1].data[0]); |
442 | iowrite32(0x0, &priv->regs->ifregs[1].data[1]); | |
443 | iowrite32(0x0, &priv->regs->ifregs[1].data[2]); | |
444 | iowrite32(0x0, &priv->regs->ifregs[1].data[3]); | |
086b5650 T |
445 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | |
446 | PCH_CMASK_ARB | PCH_CMASK_CTRL, | |
8339a7ed | 447 | &priv->regs->ifregs[1].cmask); |
15ffc8fd | 448 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i); |
b21d18b5 MO |
449 | } |
450 | } | |
451 | ||
452 | static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv) | |
453 | { | |
454 | int i; | |
b21d18b5 | 455 | |
15ffc8fd T |
456 | for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) { |
457 | iowrite32(PCH_CMASK_RX_TX_GET, | |
458 | &priv->regs->ifregs[0].cmask); | |
459 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i); | |
b21d18b5 | 460 | |
15ffc8fd T |
461 | iowrite32(0x0, &priv->regs->ifregs[0].id1); |
462 | iowrite32(0x0, &priv->regs->ifregs[0].id2); | |
b21d18b5 | 463 | |
15ffc8fd T |
464 | pch_can_bit_set(&priv->regs->ifregs[0].mcont, |
465 | PCH_IF_MCONT_UMASK); | |
b21d18b5 | 466 | |
15ffc8fd T |
467 | /* Set FIFO mode set to 0 except last Rx Obj*/ |
468 | pch_can_bit_clear(&priv->regs->ifregs[0].mcont, | |
469 | PCH_IF_MCONT_EOB); | |
470 | /* In case FIFO mode, Last EoB of Rx Obj must be 1 */ | |
471 | if (i == PCH_RX_OBJ_END) | |
472 | pch_can_bit_set(&priv->regs->ifregs[0].mcont, | |
086b5650 | 473 | PCH_IF_MCONT_EOB); |
b21d18b5 | 474 | |
15ffc8fd T |
475 | iowrite32(0, &priv->regs->ifregs[0].mask1); |
476 | pch_can_bit_clear(&priv->regs->ifregs[0].mask2, | |
477 | 0x1fff | PCH_MASK2_MDIR_MXTD); | |
b21d18b5 | 478 | |
15ffc8fd T |
479 | /* Setting CMASK for writing */ |
480 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | | |
481 | PCH_CMASK_ARB | PCH_CMASK_CTRL, | |
482 | &priv->regs->ifregs[0].cmask); | |
b21d18b5 | 483 | |
15ffc8fd T |
484 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i); |
485 | } | |
b21d18b5 | 486 | |
15ffc8fd T |
487 | for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) { |
488 | iowrite32(PCH_CMASK_RX_TX_GET, | |
489 | &priv->regs->ifregs[1].cmask); | |
490 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i); | |
b21d18b5 | 491 | |
15ffc8fd T |
492 | /* Resetting DIR bit for reception */ |
493 | iowrite32(0x0, &priv->regs->ifregs[1].id1); | |
494 | iowrite32(0x0, &priv->regs->ifregs[1].id2); | |
495 | pch_can_bit_set(&priv->regs->ifregs[1].id2, PCH_ID2_DIR); | |
b21d18b5 | 496 | |
15ffc8fd T |
497 | /* Setting EOB bit for transmitter */ |
498 | iowrite32(PCH_IF_MCONT_EOB, &priv->regs->ifregs[1].mcont); | |
b21d18b5 | 499 | |
15ffc8fd T |
500 | pch_can_bit_set(&priv->regs->ifregs[1].mcont, |
501 | PCH_IF_MCONT_UMASK); | |
502 | ||
503 | iowrite32(0, &priv->regs->ifregs[1].mask1); | |
504 | pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff); | |
505 | ||
506 | /* Setting CMASK for writing */ | |
507 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | | |
508 | PCH_CMASK_ARB | PCH_CMASK_CTRL, | |
509 | &priv->regs->ifregs[1].cmask); | |
510 | ||
511 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i); | |
b21d18b5 | 512 | } |
b21d18b5 MO |
513 | } |
514 | ||
515 | static void pch_can_init(struct pch_can_priv *priv) | |
516 | { | |
517 | /* Stopping the Can device. */ | |
518 | pch_can_set_run_mode(priv, PCH_CAN_STOP); | |
519 | ||
520 | /* Clearing all the message object buffers. */ | |
521 | pch_can_clear_buffers(priv); | |
522 | ||
523 | /* Configuring the respective message object as either rx/tx object. */ | |
524 | pch_can_config_rx_tx_buffers(priv); | |
525 | ||
526 | /* Enabling the interrupts. */ | |
527 | pch_can_set_int_enables(priv, PCH_CAN_ALL); | |
528 | } | |
529 | ||
530 | static void pch_can_release(struct pch_can_priv *priv) | |
531 | { | |
532 | /* Stooping the CAN device. */ | |
533 | pch_can_set_run_mode(priv, PCH_CAN_STOP); | |
534 | ||
535 | /* Disabling the interrupts. */ | |
536 | pch_can_set_int_enables(priv, PCH_CAN_NONE); | |
537 | ||
538 | /* Disabling all the receive object. */ | |
8339a7ed | 539 | pch_can_set_rx_all(priv, 0); |
b21d18b5 MO |
540 | |
541 | /* Disabling all the transmit object. */ | |
8339a7ed | 542 | pch_can_set_tx_all(priv, 0); |
b21d18b5 MO |
543 | } |
544 | ||
545 | /* This function clears interrupt(s) from the CAN device. */ | |
546 | static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask) | |
547 | { | |
086b5650 | 548 | if (mask == PCH_STATUS_INT) { |
b21d18b5 MO |
549 | ioread32(&priv->regs->stat); |
550 | return; | |
551 | } | |
552 | ||
553 | /* Clear interrupt for transmit object */ | |
15ffc8fd T |
554 | if ((mask >= PCH_RX_OBJ_START) && (mask <= PCH_RX_OBJ_END)) { |
555 | /* Setting CMASK for clearing the reception interrupts. */ | |
556 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB, | |
557 | &priv->regs->ifregs[0].cmask); | |
558 | ||
559 | /* Clearing the Dir bit. */ | |
560 | pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR); | |
561 | ||
562 | /* Clearing NewDat & IntPnd */ | |
563 | pch_can_bit_clear(&priv->regs->ifregs[0].mcont, | |
564 | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND); | |
565 | ||
566 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, mask); | |
567 | } else if ((mask >= PCH_TX_OBJ_START) && (mask <= PCH_TX_OBJ_END)) { | |
b21d18b5 MO |
568 | /* Setting CMASK for clearing interrupts for |
569 | frame transmission. */ | |
086b5650 | 570 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB, |
8339a7ed | 571 | &priv->regs->ifregs[1].cmask); |
b21d18b5 MO |
572 | |
573 | /* Resetting the ID registers. */ | |
8339a7ed | 574 | pch_can_bit_set(&priv->regs->ifregs[1].id2, |
086b5650 | 575 | PCH_ID2_DIR | (0x7ff << 2)); |
8339a7ed | 576 | iowrite32(0x0, &priv->regs->ifregs[1].id1); |
b21d18b5 MO |
577 | |
578 | /* Claring NewDat, TxRqst & IntPnd */ | |
8339a7ed | 579 | pch_can_bit_clear(&priv->regs->ifregs[1].mcont, |
086b5650 T |
580 | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND | |
581 | PCH_IF_MCONT_TXRQXT); | |
8339a7ed | 582 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, mask); |
b21d18b5 MO |
583 | } |
584 | } | |
585 | ||
586 | static int pch_can_get_buffer_status(struct pch_can_priv *priv) | |
587 | { | |
588 | return (ioread32(&priv->regs->treq1) & 0xffff) | | |
589 | ((ioread32(&priv->regs->treq2) & 0xffff) << 16); | |
590 | } | |
591 | ||
592 | static void pch_can_reset(struct pch_can_priv *priv) | |
593 | { | |
594 | /* write to sw reset register */ | |
595 | iowrite32(1, &priv->regs->srst); | |
596 | iowrite32(0, &priv->regs->srst); | |
597 | } | |
598 | ||
599 | static void pch_can_error(struct net_device *ndev, u32 status) | |
600 | { | |
601 | struct sk_buff *skb; | |
602 | struct pch_can_priv *priv = netdev_priv(ndev); | |
603 | struct can_frame *cf; | |
d68f6837 | 604 | u32 errc, lec; |
b21d18b5 MO |
605 | struct net_device_stats *stats = &(priv->ndev->stats); |
606 | enum can_state state = priv->can.state; | |
607 | ||
608 | skb = alloc_can_err_skb(ndev, &cf); | |
609 | if (!skb) | |
610 | return; | |
611 | ||
612 | if (status & PCH_BUS_OFF) { | |
8339a7ed T |
613 | pch_can_set_tx_all(priv, 0); |
614 | pch_can_set_rx_all(priv, 0); | |
b21d18b5 MO |
615 | state = CAN_STATE_BUS_OFF; |
616 | cf->can_id |= CAN_ERR_BUSOFF; | |
617 | can_bus_off(ndev); | |
618 | pch_can_set_run_mode(priv, PCH_CAN_RUN); | |
619 | dev_err(&ndev->dev, "%s -> Bus Off occurres.\n", __func__); | |
620 | } | |
621 | ||
622 | /* Warning interrupt. */ | |
623 | if (status & PCH_EWARN) { | |
624 | state = CAN_STATE_ERROR_WARNING; | |
625 | priv->can.can_stats.error_warning++; | |
626 | cf->can_id |= CAN_ERR_CRTL; | |
627 | errc = ioread32(&priv->regs->errc); | |
086b5650 | 628 | if (((errc & PCH_REC) >> 8) > 96) |
b21d18b5 | 629 | cf->data[1] |= CAN_ERR_CRTL_RX_WARNING; |
086b5650 | 630 | if ((errc & PCH_TEC) > 96) |
b21d18b5 MO |
631 | cf->data[1] |= CAN_ERR_CRTL_TX_WARNING; |
632 | dev_warn(&ndev->dev, | |
633 | "%s -> Error Counter is more than 96.\n", __func__); | |
634 | } | |
635 | /* Error passive interrupt. */ | |
636 | if (status & PCH_EPASSIV) { | |
637 | priv->can.can_stats.error_passive++; | |
638 | state = CAN_STATE_ERROR_PASSIVE; | |
639 | cf->can_id |= CAN_ERR_CRTL; | |
640 | errc = ioread32(&priv->regs->errc); | |
086b5650 | 641 | if (((errc & PCH_REC) >> 8) > 127) |
b21d18b5 | 642 | cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; |
086b5650 | 643 | if ((errc & PCH_TEC) > 127) |
b21d18b5 MO |
644 | cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; |
645 | dev_err(&ndev->dev, | |
646 | "%s -> CAN controller is ERROR PASSIVE .\n", __func__); | |
647 | } | |
648 | ||
d68f6837 T |
649 | lec = status & PCH_LEC_ALL; |
650 | switch (lec) { | |
651 | case PCH_STUF_ERR: | |
652 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
b21d18b5 MO |
653 | priv->can.can_stats.bus_error++; |
654 | stats->rx_errors++; | |
d68f6837 T |
655 | break; |
656 | case PCH_FORM_ERR: | |
657 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
658 | priv->can.can_stats.bus_error++; | |
659 | stats->rx_errors++; | |
660 | break; | |
661 | case PCH_ACK_ERR: | |
662 | cf->can_id |= CAN_ERR_ACK; | |
663 | priv->can.can_stats.bus_error++; | |
664 | stats->rx_errors++; | |
665 | break; | |
666 | case PCH_BIT1_ERR: | |
667 | case PCH_BIT0_ERR: | |
668 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
669 | priv->can.can_stats.bus_error++; | |
670 | stats->rx_errors++; | |
671 | break; | |
672 | case PCH_CRC_ERR: | |
673 | cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ | | |
674 | CAN_ERR_PROT_LOC_CRC_DEL; | |
675 | priv->can.can_stats.bus_error++; | |
676 | stats->rx_errors++; | |
677 | break; | |
678 | case PCH_LEC_ALL: /* Written by CPU. No error status */ | |
679 | break; | |
b21d18b5 MO |
680 | } |
681 | ||
682 | priv->can.state = state; | |
683 | netif_rx(skb); | |
684 | ||
685 | stats->rx_packets++; | |
686 | stats->rx_bytes += cf->can_dlc; | |
687 | } | |
688 | ||
689 | static irqreturn_t pch_can_interrupt(int irq, void *dev_id) | |
690 | { | |
691 | struct net_device *ndev = (struct net_device *)dev_id; | |
692 | struct pch_can_priv *priv = netdev_priv(ndev); | |
693 | ||
694 | pch_can_set_int_enables(priv, PCH_CAN_NONE); | |
695 | ||
696 | napi_schedule(&priv->napi); | |
697 | ||
698 | return IRQ_HANDLED; | |
699 | } | |
700 | ||
701 | static int pch_can_rx_normal(struct net_device *ndev, u32 int_stat) | |
702 | { | |
703 | u32 reg; | |
704 | canid_t id; | |
705 | u32 ide; | |
706 | u32 rtr; | |
8ac9702b | 707 | int i, k; |
b21d18b5 MO |
708 | int rcv_pkts = 0; |
709 | struct sk_buff *skb; | |
710 | struct can_frame *cf; | |
711 | struct pch_can_priv *priv = netdev_priv(ndev); | |
712 | struct net_device_stats *stats = &(priv->ndev->stats); | |
8ac9702b | 713 | u16 data_reg; |
b21d18b5 MO |
714 | |
715 | /* Reading the messsage object from the Message RAM */ | |
8339a7ed T |
716 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); |
717 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, int_stat); | |
b21d18b5 MO |
718 | |
719 | /* Reading the MCONT register. */ | |
8339a7ed | 720 | reg = ioread32(&priv->regs->ifregs[0].mcont); |
b21d18b5 MO |
721 | reg &= 0xffff; |
722 | ||
086b5650 | 723 | for (k = int_stat; !(reg & PCH_IF_MCONT_EOB); k++) { |
b21d18b5 | 724 | /* If MsgLost bit set. */ |
086b5650 | 725 | if (reg & PCH_IF_MCONT_MSGLOST) { |
b21d18b5 | 726 | dev_err(&priv->ndev->dev, "Msg Obj is overwritten.\n"); |
8339a7ed | 727 | pch_can_bit_clear(&priv->regs->ifregs[0].mcont, |
086b5650 T |
728 | PCH_IF_MCONT_MSGLOST); |
729 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL, | |
8339a7ed T |
730 | &priv->regs->ifregs[0].cmask); |
731 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, k); | |
b21d18b5 MO |
732 | |
733 | skb = alloc_can_err_skb(ndev, &cf); | |
734 | if (!skb) | |
735 | return -ENOMEM; | |
736 | ||
737 | priv->can.can_stats.error_passive++; | |
738 | priv->can.state = CAN_STATE_ERROR_PASSIVE; | |
739 | cf->can_id |= CAN_ERR_CRTL; | |
740 | cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW; | |
741 | cf->data[2] |= CAN_ERR_PROT_OVERLOAD; | |
742 | stats->rx_packets++; | |
743 | stats->rx_bytes += cf->can_dlc; | |
744 | ||
745 | netif_receive_skb(skb); | |
746 | rcv_pkts++; | |
747 | goto RX_NEXT; | |
748 | } | |
086b5650 | 749 | if (!(reg & PCH_IF_MCONT_NEWDAT)) |
b21d18b5 MO |
750 | goto RX_NEXT; |
751 | ||
752 | skb = alloc_can_skb(priv->ndev, &cf); | |
753 | if (!skb) | |
754 | return -ENOMEM; | |
755 | ||
756 | /* Get Received data */ | |
8339a7ed T |
757 | ide = ((ioread32(&priv->regs->ifregs[0].id2)) & PCH_ID2_XTD) >> |
758 | 14; | |
b21d18b5 | 759 | if (ide) { |
8339a7ed T |
760 | id = (ioread32(&priv->regs->ifregs[0].id1) & 0xffff); |
761 | id |= (((ioread32(&priv->regs->ifregs[0].id2)) & | |
b21d18b5 MO |
762 | 0x1fff) << 16); |
763 | cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG; | |
764 | } else { | |
8339a7ed T |
765 | id = (((ioread32(&priv->regs->ifregs[0].id2)) & |
766 | (CAN_SFF_MASK << 2)) >> 2); | |
b21d18b5 MO |
767 | cf->can_id = (id & CAN_SFF_MASK); |
768 | } | |
769 | ||
8339a7ed | 770 | rtr = (ioread32(&priv->regs->ifregs[0].id2) & PCH_ID2_DIR); |
b21d18b5 MO |
771 | if (rtr) { |
772 | cf->can_dlc = 0; | |
773 | cf->can_id |= CAN_RTR_FLAG; | |
774 | } else { | |
15ffc8fd T |
775 | cf->can_dlc = |
776 | ((ioread32(&priv->regs->ifregs[0].mcont)) & 0x0f); | |
b21d18b5 MO |
777 | } |
778 | ||
8ac9702b T |
779 | for (i = 0; i < cf->can_dlc; i += 2) { |
780 | data_reg = ioread16(&priv->regs->ifregs[0].data[i / 2]); | |
781 | cf->data[i] = data_reg; | |
782 | cf->data[i + 1] = data_reg >> 8; | |
b21d18b5 MO |
783 | } |
784 | ||
785 | netif_receive_skb(skb); | |
786 | rcv_pkts++; | |
787 | stats->rx_packets++; | |
788 | stats->rx_bytes += cf->can_dlc; | |
789 | ||
790 | if (k < PCH_FIFO_THRESH) { | |
086b5650 | 791 | iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | |
8339a7ed | 792 | PCH_CMASK_ARB, &priv->regs->ifregs[0].cmask); |
b21d18b5 MO |
793 | |
794 | /* Clearing the Dir bit. */ | |
8339a7ed T |
795 | pch_can_bit_clear(&priv->regs->ifregs[0].id2, |
796 | PCH_ID2_DIR); | |
b21d18b5 MO |
797 | |
798 | /* Clearing NewDat & IntPnd */ | |
8339a7ed | 799 | pch_can_bit_clear(&priv->regs->ifregs[0].mcont, |
086b5650 | 800 | PCH_IF_MCONT_INTPND); |
8339a7ed | 801 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, k); |
b21d18b5 MO |
802 | } else if (k > PCH_FIFO_THRESH) { |
803 | pch_can_int_clr(priv, k); | |
804 | } else if (k == PCH_FIFO_THRESH) { | |
805 | int cnt; | |
806 | for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++) | |
807 | pch_can_int_clr(priv, cnt+1); | |
808 | } | |
809 | RX_NEXT: | |
810 | /* Reading the messsage object from the Message RAM */ | |
8339a7ed | 811 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); |
15ffc8fd | 812 | pch_can_check_if_busy(&priv->regs->ifregs[0].creq, k); |
8339a7ed | 813 | reg = ioread32(&priv->regs->ifregs[0].mcont); |
b21d18b5 MO |
814 | } |
815 | ||
816 | return rcv_pkts; | |
817 | } | |
e489cceb T |
818 | |
819 | static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat) | |
b21d18b5 | 820 | { |
b21d18b5 MO |
821 | struct pch_can_priv *priv = netdev_priv(ndev); |
822 | struct net_device_stats *stats = &(priv->ndev->stats); | |
823 | u32 dlc; | |
e489cceb T |
824 | |
825 | can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1); | |
826 | iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND, | |
827 | &priv->regs->ifregs[1].cmask); | |
828 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, int_stat); | |
829 | dlc = get_can_dlc(ioread32(&priv->regs->ifregs[1].mcont) & | |
830 | PCH_IF_MCONT_DLC); | |
831 | stats->tx_bytes += dlc; | |
832 | stats->tx_packets++; | |
833 | if (int_stat == PCH_TX_OBJ_END) | |
834 | netif_wake_queue(ndev); | |
835 | } | |
836 | ||
837 | static int pch_can_rx_poll(struct napi_struct *napi, int quota) | |
838 | { | |
839 | struct net_device *ndev = napi->dev; | |
840 | struct pch_can_priv *priv = netdev_priv(ndev); | |
b21d18b5 MO |
841 | u32 int_stat; |
842 | int rcv_pkts = 0; | |
843 | u32 reg_stat; | |
b21d18b5 MO |
844 | |
845 | int_stat = pch_can_int_pending(priv); | |
846 | if (!int_stat) | |
e489cceb | 847 | goto end; |
b21d18b5 | 848 | |
e489cceb | 849 | if ((int_stat == PCH_STATUS_INT) && (quota > 0)) { |
b21d18b5 MO |
850 | reg_stat = ioread32(&priv->regs->stat); |
851 | if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) { | |
e489cceb T |
852 | if (reg_stat & PCH_BUS_OFF || |
853 | (reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) { | |
b21d18b5 | 854 | pch_can_error(ndev, reg_stat); |
e489cceb T |
855 | quota--; |
856 | } | |
b21d18b5 MO |
857 | } |
858 | ||
e489cceb | 859 | if (reg_stat & PCH_TX_OK) |
b21d18b5 | 860 | pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK); |
b21d18b5 MO |
861 | |
862 | if (reg_stat & PCH_RX_OK) | |
863 | pch_can_bit_clear(&priv->regs->stat, PCH_RX_OK); | |
864 | ||
865 | int_stat = pch_can_int_pending(priv); | |
b21d18b5 MO |
866 | } |
867 | ||
e489cceb T |
868 | if (quota == 0) |
869 | goto end; | |
870 | ||
15ffc8fd | 871 | if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) { |
e489cceb T |
872 | rcv_pkts += pch_can_rx_normal(ndev, int_stat); |
873 | quota -= rcv_pkts; | |
874 | if (quota < 0) | |
875 | goto end; | |
15ffc8fd T |
876 | } else if ((int_stat >= PCH_TX_OBJ_START) && |
877 | (int_stat <= PCH_TX_OBJ_END)) { | |
878 | /* Handle transmission interrupt */ | |
e489cceb | 879 | pch_can_tx_complete(ndev, int_stat); |
b21d18b5 MO |
880 | } |
881 | ||
e489cceb | 882 | end: |
b21d18b5 MO |
883 | napi_complete(napi); |
884 | pch_can_set_int_enables(priv, PCH_CAN_ALL); | |
885 | ||
886 | return rcv_pkts; | |
887 | } | |
888 | ||
889 | static int pch_set_bittiming(struct net_device *ndev) | |
890 | { | |
891 | struct pch_can_priv *priv = netdev_priv(ndev); | |
892 | const struct can_bittiming *bt = &priv->can.bittiming; | |
893 | u32 canbit; | |
894 | u32 bepe; | |
895 | u32 brp; | |
896 | ||
897 | /* Setting the CCE bit for accessing the Can Timing register. */ | |
086b5650 | 898 | pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE); |
b21d18b5 MO |
899 | |
900 | brp = (bt->tq) / (1000000000/PCH_CAN_CLK) - 1; | |
086b5650 T |
901 | canbit = brp & PCH_MSK_BITT_BRP; |
902 | canbit |= (bt->sjw - 1) << PCH_BIT_SJW; | |
903 | canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1; | |
904 | canbit |= (bt->phase_seg2 - 1) << PCH_BIT_TSEG2; | |
905 | bepe = (brp & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE; | |
b21d18b5 MO |
906 | iowrite32(canbit, &priv->regs->bitt); |
907 | iowrite32(bepe, &priv->regs->brpe); | |
086b5650 | 908 | pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE); |
b21d18b5 MO |
909 | |
910 | return 0; | |
911 | } | |
912 | ||
913 | static void pch_can_start(struct net_device *ndev) | |
914 | { | |
915 | struct pch_can_priv *priv = netdev_priv(ndev); | |
916 | ||
917 | if (priv->can.state != CAN_STATE_STOPPED) | |
918 | pch_can_reset(priv); | |
919 | ||
920 | pch_set_bittiming(ndev); | |
921 | pch_can_set_optmode(priv); | |
922 | ||
8339a7ed T |
923 | pch_can_set_tx_all(priv, 1); |
924 | pch_can_set_rx_all(priv, 1); | |
b21d18b5 MO |
925 | |
926 | /* Setting the CAN to run mode. */ | |
927 | pch_can_set_run_mode(priv, PCH_CAN_RUN); | |
928 | ||
929 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
930 | ||
931 | return; | |
932 | } | |
933 | ||
934 | static int pch_can_do_set_mode(struct net_device *ndev, enum can_mode mode) | |
935 | { | |
936 | int ret = 0; | |
937 | ||
938 | switch (mode) { | |
939 | case CAN_MODE_START: | |
940 | pch_can_start(ndev); | |
941 | netif_wake_queue(ndev); | |
942 | break; | |
943 | default: | |
944 | ret = -EOPNOTSUPP; | |
945 | break; | |
946 | } | |
947 | ||
948 | return ret; | |
949 | } | |
950 | ||
951 | static int pch_can_open(struct net_device *ndev) | |
952 | { | |
953 | struct pch_can_priv *priv = netdev_priv(ndev); | |
954 | int retval; | |
955 | ||
956 | retval = pci_enable_msi(priv->dev); | |
957 | if (retval) { | |
958 | dev_info(&ndev->dev, "PCH CAN opened without MSI\n"); | |
959 | priv->use_msi = 0; | |
960 | } else { | |
961 | dev_info(&ndev->dev, "PCH CAN opened with MSI\n"); | |
962 | priv->use_msi = 1; | |
963 | } | |
964 | ||
965 | /* Regsitering the interrupt. */ | |
966 | retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED, | |
967 | ndev->name, ndev); | |
968 | if (retval) { | |
969 | dev_err(&ndev->dev, "request_irq failed.\n"); | |
970 | goto req_irq_err; | |
971 | } | |
972 | ||
973 | /* Open common can device */ | |
974 | retval = open_candev(ndev); | |
975 | if (retval) { | |
976 | dev_err(ndev->dev.parent, "open_candev() failed %d\n", retval); | |
977 | goto err_open_candev; | |
978 | } | |
979 | ||
980 | pch_can_init(priv); | |
981 | pch_can_start(ndev); | |
982 | napi_enable(&priv->napi); | |
983 | netif_start_queue(ndev); | |
984 | ||
985 | return 0; | |
986 | ||
987 | err_open_candev: | |
988 | free_irq(priv->dev->irq, ndev); | |
989 | req_irq_err: | |
990 | if (priv->use_msi) | |
991 | pci_disable_msi(priv->dev); | |
992 | ||
993 | pch_can_release(priv); | |
994 | ||
995 | return retval; | |
996 | } | |
997 | ||
998 | static int pch_close(struct net_device *ndev) | |
999 | { | |
1000 | struct pch_can_priv *priv = netdev_priv(ndev); | |
1001 | ||
1002 | netif_stop_queue(ndev); | |
1003 | napi_disable(&priv->napi); | |
1004 | pch_can_release(priv); | |
1005 | free_irq(priv->dev->irq, ndev); | |
1006 | if (priv->use_msi) | |
1007 | pci_disable_msi(priv->dev); | |
1008 | close_candev(ndev); | |
1009 | priv->can.state = CAN_STATE_STOPPED; | |
1010 | return 0; | |
1011 | } | |
1012 | ||
b21d18b5 MO |
1013 | static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) |
1014 | { | |
b21d18b5 MO |
1015 | struct pch_can_priv *priv = netdev_priv(ndev); |
1016 | struct can_frame *cf = (struct can_frame *)skb->data; | |
1017 | int tx_buffer_avail = 0; | |
8ac9702b | 1018 | int i; |
b21d18b5 MO |
1019 | |
1020 | if (can_dropped_invalid_skb(ndev, skb)) | |
1021 | return NETDEV_TX_OK; | |
1022 | ||
76d94b23 T |
1023 | if (priv->tx_obj == PCH_TX_OBJ_END) { |
1024 | if (ioread32(&priv->regs->treq2) & PCH_TREQ2_TX_MASK) | |
1025 | netif_stop_queue(ndev); | |
b21d18b5 | 1026 | |
76d94b23 T |
1027 | tx_buffer_avail = priv->tx_obj; |
1028 | priv->tx_obj = PCH_TX_OBJ_START; | |
b21d18b5 MO |
1029 | } else { |
1030 | tx_buffer_avail = priv->tx_obj; | |
76d94b23 | 1031 | priv->tx_obj++; |
b21d18b5 | 1032 | } |
b21d18b5 | 1033 | |
b21d18b5 | 1034 | /* Reading the Msg Obj from the Msg RAM to the Interface register. */ |
8339a7ed T |
1035 | iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask); |
1036 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_buffer_avail); | |
b21d18b5 MO |
1037 | |
1038 | /* Setting the CMASK register. */ | |
8339a7ed | 1039 | pch_can_bit_set(&priv->regs->ifregs[1].cmask, PCH_CMASK_ALL); |
b21d18b5 MO |
1040 | |
1041 | /* If ID extended is set. */ | |
8339a7ed T |
1042 | pch_can_bit_clear(&priv->regs->ifregs[1].id1, 0xffff); |
1043 | pch_can_bit_clear(&priv->regs->ifregs[1].id2, 0x1fff | PCH_ID2_XTD); | |
b21d18b5 | 1044 | if (cf->can_id & CAN_EFF_FLAG) { |
8339a7ed T |
1045 | pch_can_bit_set(&priv->regs->ifregs[1].id1, |
1046 | cf->can_id & 0xffff); | |
1047 | pch_can_bit_set(&priv->regs->ifregs[1].id2, | |
086b5650 | 1048 | ((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD); |
b21d18b5 | 1049 | } else { |
8339a7ed T |
1050 | pch_can_bit_set(&priv->regs->ifregs[1].id1, 0); |
1051 | pch_can_bit_set(&priv->regs->ifregs[1].id2, | |
b21d18b5 MO |
1052 | (cf->can_id & CAN_SFF_MASK) << 2); |
1053 | } | |
1054 | ||
1055 | /* If remote frame has to be transmitted.. */ | |
1056 | if (cf->can_id & CAN_RTR_FLAG) | |
8339a7ed | 1057 | pch_can_bit_clear(&priv->regs->ifregs[1].id2, PCH_ID2_DIR); |
b21d18b5 | 1058 | |
8ac9702b T |
1059 | /* Copy data to register */ |
1060 | for (i = 0; i < cf->can_dlc; i += 2) { | |
1061 | iowrite16(cf->data[i] | (cf->data[i + 1] << 8), | |
1062 | &priv->regs->ifregs[1].data[i / 2]); | |
b21d18b5 MO |
1063 | } |
1064 | ||
15ffc8fd | 1065 | can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_END - 1); |
b21d18b5 MO |
1066 | |
1067 | /* Updating the size of the data. */ | |
8339a7ed T |
1068 | pch_can_bit_clear(&priv->regs->ifregs[1].mcont, 0x0f); |
1069 | pch_can_bit_set(&priv->regs->ifregs[1].mcont, cf->can_dlc); | |
b21d18b5 MO |
1070 | |
1071 | /* Clearing IntPend, NewDat & TxRqst */ | |
8339a7ed | 1072 | pch_can_bit_clear(&priv->regs->ifregs[1].mcont, |
086b5650 T |
1073 | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND | |
1074 | PCH_IF_MCONT_TXRQXT); | |
b21d18b5 MO |
1075 | |
1076 | /* Setting NewDat, TxRqst bits */ | |
8339a7ed | 1077 | pch_can_bit_set(&priv->regs->ifregs[1].mcont, |
086b5650 | 1078 | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT); |
b21d18b5 | 1079 | |
8339a7ed | 1080 | pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_buffer_avail); |
b21d18b5 | 1081 | |
b21d18b5 MO |
1082 | return NETDEV_TX_OK; |
1083 | } | |
1084 | ||
1085 | static const struct net_device_ops pch_can_netdev_ops = { | |
1086 | .ndo_open = pch_can_open, | |
1087 | .ndo_stop = pch_close, | |
1088 | .ndo_start_xmit = pch_xmit, | |
1089 | }; | |
1090 | ||
1091 | static void __devexit pch_can_remove(struct pci_dev *pdev) | |
1092 | { | |
1093 | struct net_device *ndev = pci_get_drvdata(pdev); | |
1094 | struct pch_can_priv *priv = netdev_priv(ndev); | |
1095 | ||
1096 | unregister_candev(priv->ndev); | |
1097 | free_candev(priv->ndev); | |
1098 | pci_iounmap(pdev, priv->regs); | |
1099 | pci_release_regions(pdev); | |
1100 | pci_disable_device(pdev); | |
1101 | pci_set_drvdata(pdev, NULL); | |
1102 | pch_can_reset(priv); | |
1103 | } | |
1104 | ||
1105 | #ifdef CONFIG_PM | |
1106 | static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state) | |
1107 | { | |
1108 | int i; /* Counter variable. */ | |
1109 | int retval; /* Return value. */ | |
1110 | u32 buf_stat; /* Variable for reading the transmit buffer status. */ | |
1111 | u32 counter = 0xFFFFFF; | |
1112 | ||
1113 | struct net_device *dev = pci_get_drvdata(pdev); | |
1114 | struct pch_can_priv *priv = netdev_priv(dev); | |
1115 | ||
1116 | /* Stop the CAN controller */ | |
1117 | pch_can_set_run_mode(priv, PCH_CAN_STOP); | |
1118 | ||
1119 | /* Indicate that we are aboutto/in suspend */ | |
1120 | priv->can.state = CAN_STATE_SLEEPING; | |
1121 | ||
1122 | /* Waiting for all transmission to complete. */ | |
1123 | while (counter) { | |
1124 | buf_stat = pch_can_get_buffer_status(priv); | |
1125 | if (!buf_stat) | |
1126 | break; | |
1127 | counter--; | |
1128 | udelay(1); | |
1129 | } | |
1130 | if (!counter) | |
1131 | dev_err(&pdev->dev, "%s -> Transmission time out.\n", __func__); | |
1132 | ||
1133 | /* Save interrupt configuration and then disable them */ | |
1134 | pch_can_get_int_enables(priv, &(priv->int_enables)); | |
1135 | pch_can_set_int_enables(priv, PCH_CAN_DISABLE); | |
1136 | ||
1137 | /* Save Tx buffer enable state */ | |
15ffc8fd T |
1138 | for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) |
1139 | priv->tx_enable[i] = pch_can_get_rxtx_ir(priv, i, PCH_TX_IFREG); | |
b21d18b5 MO |
1140 | |
1141 | /* Disable all Transmit buffers */ | |
8339a7ed | 1142 | pch_can_set_tx_all(priv, 0); |
b21d18b5 MO |
1143 | |
1144 | /* Save Rx buffer enable state */ | |
15ffc8fd T |
1145 | for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) { |
1146 | priv->rx_enable[i] = pch_can_get_rxtx_ir(priv, i, PCH_RX_IFREG); | |
1147 | pch_can_get_rx_buffer_link(priv, i, &priv->rx_link[i]); | |
b21d18b5 MO |
1148 | } |
1149 | ||
1150 | /* Disable all Receive buffers */ | |
8339a7ed | 1151 | pch_can_set_rx_all(priv, 0); |
b21d18b5 MO |
1152 | retval = pci_save_state(pdev); |
1153 | if (retval) { | |
1154 | dev_err(&pdev->dev, "pci_save_state failed.\n"); | |
1155 | } else { | |
1156 | pci_enable_wake(pdev, PCI_D3hot, 0); | |
1157 | pci_disable_device(pdev); | |
1158 | pci_set_power_state(pdev, pci_choose_state(pdev, state)); | |
1159 | } | |
1160 | ||
1161 | return retval; | |
1162 | } | |
1163 | ||
1164 | static int pch_can_resume(struct pci_dev *pdev) | |
1165 | { | |
1166 | int i; /* Counter variable. */ | |
1167 | int retval; /* Return variable. */ | |
1168 | struct net_device *dev = pci_get_drvdata(pdev); | |
1169 | struct pch_can_priv *priv = netdev_priv(dev); | |
1170 | ||
1171 | pci_set_power_state(pdev, PCI_D0); | |
1172 | pci_restore_state(pdev); | |
1173 | retval = pci_enable_device(pdev); | |
1174 | if (retval) { | |
1175 | dev_err(&pdev->dev, "pci_enable_device failed.\n"); | |
1176 | return retval; | |
1177 | } | |
1178 | ||
1179 | pci_enable_wake(pdev, PCI_D3hot, 0); | |
1180 | ||
1181 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
1182 | ||
1183 | /* Disabling all interrupts. */ | |
1184 | pch_can_set_int_enables(priv, PCH_CAN_DISABLE); | |
1185 | ||
1186 | /* Setting the CAN device in Stop Mode. */ | |
1187 | pch_can_set_run_mode(priv, PCH_CAN_STOP); | |
1188 | ||
1189 | /* Configuring the transmit and receive buffers. */ | |
1190 | pch_can_config_rx_tx_buffers(priv); | |
1191 | ||
1192 | /* Restore the CAN state */ | |
1193 | pch_set_bittiming(dev); | |
1194 | ||
1195 | /* Listen/Active */ | |
1196 | pch_can_set_optmode(priv); | |
1197 | ||
1198 | /* Enabling the transmit buffer. */ | |
15ffc8fd T |
1199 | for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) |
1200 | pch_can_set_rxtx(priv, i, priv->tx_enable[i], PCH_TX_IFREG); | |
b21d18b5 MO |
1201 | |
1202 | /* Configuring the receive buffer and enabling them. */ | |
15ffc8fd T |
1203 | for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) { |
1204 | /* Restore buffer link */ | |
1205 | pch_can_set_rx_buffer_link(priv, i, priv->rx_link[i]); | |
b21d18b5 | 1206 | |
15ffc8fd T |
1207 | /* Restore buffer enables */ |
1208 | pch_can_set_rxtx(priv, i, priv->rx_enable[i], PCH_RX_IFREG); | |
b21d18b5 MO |
1209 | } |
1210 | ||
1211 | /* Enable CAN Interrupts */ | |
1212 | pch_can_set_int_custom(priv); | |
1213 | ||
1214 | /* Restore Run Mode */ | |
1215 | pch_can_set_run_mode(priv, PCH_CAN_RUN); | |
1216 | ||
1217 | return retval; | |
1218 | } | |
1219 | #else | |
1220 | #define pch_can_suspend NULL | |
1221 | #define pch_can_resume NULL | |
1222 | #endif | |
1223 | ||
1224 | static int pch_can_get_berr_counter(const struct net_device *dev, | |
1225 | struct can_berr_counter *bec) | |
1226 | { | |
1227 | struct pch_can_priv *priv = netdev_priv(dev); | |
1228 | ||
086b5650 T |
1229 | bec->txerr = ioread32(&priv->regs->errc) & PCH_TEC; |
1230 | bec->rxerr = (ioread32(&priv->regs->errc) & PCH_REC) >> 8; | |
b21d18b5 MO |
1231 | |
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | static int __devinit pch_can_probe(struct pci_dev *pdev, | |
1236 | const struct pci_device_id *id) | |
1237 | { | |
1238 | struct net_device *ndev; | |
1239 | struct pch_can_priv *priv; | |
1240 | int rc; | |
b21d18b5 MO |
1241 | void __iomem *addr; |
1242 | ||
1243 | rc = pci_enable_device(pdev); | |
1244 | if (rc) { | |
1245 | dev_err(&pdev->dev, "Failed pci_enable_device %d\n", rc); | |
1246 | goto probe_exit_endev; | |
1247 | } | |
1248 | ||
1249 | rc = pci_request_regions(pdev, KBUILD_MODNAME); | |
1250 | if (rc) { | |
1251 | dev_err(&pdev->dev, "Failed pci_request_regions %d\n", rc); | |
1252 | goto probe_exit_pcireq; | |
1253 | } | |
1254 | ||
1255 | addr = pci_iomap(pdev, 1, 0); | |
1256 | if (!addr) { | |
1257 | rc = -EIO; | |
1258 | dev_err(&pdev->dev, "Failed pci_iomap\n"); | |
1259 | goto probe_exit_ipmap; | |
1260 | } | |
1261 | ||
15ffc8fd | 1262 | ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_END); |
b21d18b5 MO |
1263 | if (!ndev) { |
1264 | rc = -ENOMEM; | |
1265 | dev_err(&pdev->dev, "Failed alloc_candev\n"); | |
1266 | goto probe_exit_alloc_candev; | |
1267 | } | |
1268 | ||
1269 | priv = netdev_priv(ndev); | |
1270 | priv->ndev = ndev; | |
1271 | priv->regs = addr; | |
1272 | priv->dev = pdev; | |
1273 | priv->can.bittiming_const = &pch_can_bittiming_const; | |
1274 | priv->can.do_set_mode = pch_can_do_set_mode; | |
1275 | priv->can.do_get_berr_counter = pch_can_get_berr_counter; | |
1276 | priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY | | |
1277 | CAN_CTRLMODE_LOOPBACK; | |
15ffc8fd | 1278 | priv->tx_obj = PCH_TX_OBJ_START; /* Point head of Tx Obj */ |
b21d18b5 MO |
1279 | |
1280 | ndev->irq = pdev->irq; | |
1281 | ndev->flags |= IFF_ECHO; | |
1282 | ||
1283 | pci_set_drvdata(pdev, ndev); | |
1284 | SET_NETDEV_DEV(ndev, &pdev->dev); | |
1285 | ndev->netdev_ops = &pch_can_netdev_ops; | |
b21d18b5 | 1286 | priv->can.clock.freq = PCH_CAN_CLK; /* Hz */ |
b21d18b5 | 1287 | |
15ffc8fd | 1288 | netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_END); |
b21d18b5 MO |
1289 | |
1290 | rc = register_candev(ndev); | |
1291 | if (rc) { | |
1292 | dev_err(&pdev->dev, "Failed register_candev %d\n", rc); | |
1293 | goto probe_exit_reg_candev; | |
1294 | } | |
1295 | ||
1296 | return 0; | |
1297 | ||
1298 | probe_exit_reg_candev: | |
1299 | free_candev(ndev); | |
1300 | probe_exit_alloc_candev: | |
1301 | pci_iounmap(pdev, addr); | |
1302 | probe_exit_ipmap: | |
1303 | pci_release_regions(pdev); | |
1304 | probe_exit_pcireq: | |
1305 | pci_disable_device(pdev); | |
1306 | probe_exit_endev: | |
1307 | return rc; | |
1308 | } | |
1309 | ||
bdfa3d8f | 1310 | static struct pci_driver pch_can_pci_driver = { |
b21d18b5 MO |
1311 | .name = "pch_can", |
1312 | .id_table = pch_pci_tbl, | |
1313 | .probe = pch_can_probe, | |
1314 | .remove = __devexit_p(pch_can_remove), | |
1315 | .suspend = pch_can_suspend, | |
1316 | .resume = pch_can_resume, | |
1317 | }; | |
1318 | ||
1319 | static int __init pch_can_pci_init(void) | |
1320 | { | |
bdfa3d8f | 1321 | return pci_register_driver(&pch_can_pci_driver); |
b21d18b5 MO |
1322 | } |
1323 | module_init(pch_can_pci_init); | |
1324 | ||
1325 | static void __exit pch_can_pci_exit(void) | |
1326 | { | |
bdfa3d8f | 1327 | pci_unregister_driver(&pch_can_pci_driver); |
b21d18b5 MO |
1328 | } |
1329 | module_exit(pch_can_pci_exit); | |
1330 | ||
1331 | MODULE_DESCRIPTION("Controller Area Network Driver"); | |
1332 | MODULE_LICENSE("GPL v2"); | |
1333 | MODULE_VERSION("0.94"); |