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3758bf25 AG |
1 | /* |
2 | * TI HECC (CAN) device driver | |
3 | * | |
4 | * This driver supports TI's HECC (High End CAN Controller module) and the | |
5 | * specs for the same is available at <http://www.ti.com> | |
6 | * | |
7 | * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation version 2. | |
12 | * | |
13 | * This program is distributed as is WITHOUT ANY WARRANTY of any | |
14 | * kind, whether express or implied; without even the implied warranty | |
15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Your platform definitions should specify module ram offsets and interrupt | |
22 | * number to use as follows: | |
23 | * | |
24 | * static struct ti_hecc_platform_data am3517_evm_hecc_pdata = { | |
25 | * .scc_hecc_offset = 0, | |
26 | * .scc_ram_offset = 0x3000, | |
27 | * .hecc_ram_offset = 0x3000, | |
28 | * .mbx_offset = 0x2000, | |
29 | * .int_line = 0, | |
30 | * .revision = 1, | |
31 | * }; | |
32 | * | |
33 | * Please see include/can/platform/ti_hecc.h for description of above fields | |
34 | * | |
35 | */ | |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/types.h> | |
41 | #include <linux/interrupt.h> | |
42 | #include <linux/errno.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <linux/skbuff.h> | |
45 | #include <linux/platform_device.h> | |
46 | #include <linux/clk.h> | |
47 | ||
48 | #include <linux/can.h> | |
49 | #include <linux/can/dev.h> | |
50 | #include <linux/can/error.h> | |
51 | #include <linux/can/platform/ti_hecc.h> | |
52 | ||
53 | #define DRV_NAME "ti_hecc" | |
54 | #define HECC_MODULE_VERSION "0.7" | |
55 | MODULE_VERSION(HECC_MODULE_VERSION); | |
56 | #define DRV_DESC "TI High End CAN Controller Driver " HECC_MODULE_VERSION | |
57 | ||
58 | /* TX / RX Mailbox Configuration */ | |
59 | #define HECC_MAX_MAILBOXES 32 /* hardware mailboxes - do not change */ | |
60 | #define MAX_TX_PRIO 0x3F /* hardware value - do not change */ | |
61 | ||
62 | /* | |
63 | * Important Note: TX mailbox configuration | |
64 | * TX mailboxes should be restricted to the number of SKB buffers to avoid | |
65 | * maintaining SKB buffers separately. TX mailboxes should be a power of 2 | |
66 | * for the mailbox logic to work. Top mailbox numbers are reserved for RX | |
67 | * and lower mailboxes for TX. | |
68 | * | |
69 | * HECC_MAX_TX_MBOX HECC_MB_TX_SHIFT | |
70 | * 4 (default) 2 | |
71 | * 8 3 | |
72 | * 16 4 | |
73 | */ | |
74 | #define HECC_MB_TX_SHIFT 2 /* as per table above */ | |
75 | #define HECC_MAX_TX_MBOX BIT(HECC_MB_TX_SHIFT) | |
76 | ||
77 | #if (HECC_MAX_TX_MBOX > CAN_ECHO_SKB_MAX) | |
78 | #error "HECC: MAX TX mailboxes should be equal or less than CAN_ECHO_SKB_MAX" | |
79 | #endif | |
80 | ||
81 | #define HECC_TX_PRIO_SHIFT (HECC_MB_TX_SHIFT) | |
82 | #define HECC_TX_PRIO_MASK (MAX_TX_PRIO << HECC_MB_TX_SHIFT) | |
83 | #define HECC_TX_MB_MASK (HECC_MAX_TX_MBOX - 1) | |
84 | #define HECC_TX_MASK ((HECC_MAX_TX_MBOX - 1) | HECC_TX_PRIO_MASK) | |
85 | #define HECC_TX_MBOX_MASK (~(BIT(HECC_MAX_TX_MBOX) - 1)) | |
86 | #define HECC_DEF_NAPI_WEIGHT HECC_MAX_RX_MBOX | |
87 | ||
88 | /* | |
89 | * Important Note: RX mailbox configuration | |
90 | * RX mailboxes are further logically split into two - main and buffer | |
91 | * mailboxes. The goal is to get all packets into main mailboxes as | |
92 | * driven by mailbox number and receive priority (higher to lower) and | |
93 | * buffer mailboxes are used to receive pkts while main mailboxes are being | |
94 | * processed. This ensures in-order packet reception. | |
95 | * | |
96 | * Here are the recommended values for buffer mailbox. Note that RX mailboxes | |
97 | * start after TX mailboxes: | |
98 | * | |
99 | * HECC_MAX_RX_MBOX HECC_RX_BUFFER_MBOX No of buffer mailboxes | |
100 | * 28 12 8 | |
101 | * 16 20 4 | |
102 | */ | |
103 | ||
104 | #define HECC_MAX_RX_MBOX (HECC_MAX_MAILBOXES - HECC_MAX_TX_MBOX) | |
105 | #define HECC_RX_BUFFER_MBOX 12 /* as per table above */ | |
106 | #define HECC_RX_FIRST_MBOX (HECC_MAX_MAILBOXES - 1) | |
107 | #define HECC_RX_HIGH_MBOX_MASK (~(BIT(HECC_RX_BUFFER_MBOX) - 1)) | |
108 | ||
109 | /* TI HECC module registers */ | |
110 | #define HECC_CANME 0x0 /* Mailbox enable */ | |
111 | #define HECC_CANMD 0x4 /* Mailbox direction */ | |
112 | #define HECC_CANTRS 0x8 /* Transmit request set */ | |
113 | #define HECC_CANTRR 0xC /* Transmit request */ | |
114 | #define HECC_CANTA 0x10 /* Transmission acknowledge */ | |
115 | #define HECC_CANAA 0x14 /* Abort acknowledge */ | |
116 | #define HECC_CANRMP 0x18 /* Receive message pending */ | |
117 | #define HECC_CANRML 0x1C /* Remote message lost */ | |
118 | #define HECC_CANRFP 0x20 /* Remote frame pending */ | |
119 | #define HECC_CANGAM 0x24 /* SECC only:Global acceptance mask */ | |
120 | #define HECC_CANMC 0x28 /* Master control */ | |
121 | #define HECC_CANBTC 0x2C /* Bit timing configuration */ | |
122 | #define HECC_CANES 0x30 /* Error and status */ | |
123 | #define HECC_CANTEC 0x34 /* Transmit error counter */ | |
124 | #define HECC_CANREC 0x38 /* Receive error counter */ | |
125 | #define HECC_CANGIF0 0x3C /* Global interrupt flag 0 */ | |
126 | #define HECC_CANGIM 0x40 /* Global interrupt mask */ | |
127 | #define HECC_CANGIF1 0x44 /* Global interrupt flag 1 */ | |
128 | #define HECC_CANMIM 0x48 /* Mailbox interrupt mask */ | |
129 | #define HECC_CANMIL 0x4C /* Mailbox interrupt level */ | |
130 | #define HECC_CANOPC 0x50 /* Overwrite protection control */ | |
131 | #define HECC_CANTIOC 0x54 /* Transmit I/O control */ | |
132 | #define HECC_CANRIOC 0x58 /* Receive I/O control */ | |
133 | #define HECC_CANLNT 0x5C /* HECC only: Local network time */ | |
134 | #define HECC_CANTOC 0x60 /* HECC only: Time-out control */ | |
135 | #define HECC_CANTOS 0x64 /* HECC only: Time-out status */ | |
136 | #define HECC_CANTIOCE 0x68 /* SCC only:Enhanced TX I/O control */ | |
137 | #define HECC_CANRIOCE 0x6C /* SCC only:Enhanced RX I/O control */ | |
138 | ||
139 | /* Mailbox registers */ | |
140 | #define HECC_CANMID 0x0 | |
141 | #define HECC_CANMCF 0x4 | |
142 | #define HECC_CANMDL 0x8 | |
143 | #define HECC_CANMDH 0xC | |
144 | ||
145 | #define HECC_SET_REG 0xFFFFFFFF | |
146 | #define HECC_CANID_MASK 0x3FF /* 18 bits mask for extended id's */ | |
147 | #define HECC_CCE_WAIT_COUNT 100 /* Wait for ~1 sec for CCE bit */ | |
148 | ||
149 | #define HECC_CANMC_SCM BIT(13) /* SCC compat mode */ | |
150 | #define HECC_CANMC_CCR BIT(12) /* Change config request */ | |
151 | #define HECC_CANMC_PDR BIT(11) /* Local Power down - for sleep mode */ | |
152 | #define HECC_CANMC_ABO BIT(7) /* Auto Bus On */ | |
153 | #define HECC_CANMC_STM BIT(6) /* Self test mode - loopback */ | |
154 | #define HECC_CANMC_SRES BIT(5) /* Software reset */ | |
155 | ||
156 | #define HECC_CANTIOC_EN BIT(3) /* Enable CAN TX I/O pin */ | |
157 | #define HECC_CANRIOC_EN BIT(3) /* Enable CAN RX I/O pin */ | |
158 | ||
159 | #define HECC_CANMID_IDE BIT(31) /* Extended frame format */ | |
160 | #define HECC_CANMID_AME BIT(30) /* Acceptance mask enable */ | |
161 | #define HECC_CANMID_AAM BIT(29) /* Auto answer mode */ | |
162 | ||
163 | #define HECC_CANES_FE BIT(24) /* form error */ | |
164 | #define HECC_CANES_BE BIT(23) /* bit error */ | |
165 | #define HECC_CANES_SA1 BIT(22) /* stuck at dominant error */ | |
166 | #define HECC_CANES_CRCE BIT(21) /* CRC error */ | |
167 | #define HECC_CANES_SE BIT(20) /* stuff bit error */ | |
168 | #define HECC_CANES_ACKE BIT(19) /* ack error */ | |
169 | #define HECC_CANES_BO BIT(18) /* Bus off status */ | |
170 | #define HECC_CANES_EP BIT(17) /* Error passive status */ | |
171 | #define HECC_CANES_EW BIT(16) /* Error warning status */ | |
172 | #define HECC_CANES_SMA BIT(5) /* suspend mode ack */ | |
173 | #define HECC_CANES_CCE BIT(4) /* Change config enabled */ | |
174 | #define HECC_CANES_PDA BIT(3) /* Power down mode ack */ | |
175 | ||
176 | #define HECC_CANBTC_SAM BIT(7) /* sample points */ | |
177 | ||
178 | #define HECC_BUS_ERROR (HECC_CANES_FE | HECC_CANES_BE |\ | |
179 | HECC_CANES_CRCE | HECC_CANES_SE |\ | |
180 | HECC_CANES_ACKE) | |
181 | ||
182 | #define HECC_CANMCF_RTR BIT(4) /* Remote transmit request */ | |
183 | ||
184 | #define HECC_CANGIF_MAIF BIT(17) /* Message alarm interrupt */ | |
185 | #define HECC_CANGIF_TCOIF BIT(16) /* Timer counter overflow int */ | |
186 | #define HECC_CANGIF_GMIF BIT(15) /* Global mailbox interrupt */ | |
187 | #define HECC_CANGIF_AAIF BIT(14) /* Abort ack interrupt */ | |
188 | #define HECC_CANGIF_WDIF BIT(13) /* Write denied interrupt */ | |
189 | #define HECC_CANGIF_WUIF BIT(12) /* Wake up interrupt */ | |
190 | #define HECC_CANGIF_RMLIF BIT(11) /* Receive message lost interrupt */ | |
191 | #define HECC_CANGIF_BOIF BIT(10) /* Bus off interrupt */ | |
192 | #define HECC_CANGIF_EPIF BIT(9) /* Error passive interrupt */ | |
193 | #define HECC_CANGIF_WLIF BIT(8) /* Warning level interrupt */ | |
194 | #define HECC_CANGIF_MBOX_MASK 0x1F /* Mailbox number mask */ | |
195 | #define HECC_CANGIM_I1EN BIT(1) /* Int line 1 enable */ | |
196 | #define HECC_CANGIM_I0EN BIT(0) /* Int line 0 enable */ | |
197 | #define HECC_CANGIM_DEF_MASK 0x700 /* only busoff/warning/passive */ | |
198 | #define HECC_CANGIM_SIL BIT(2) /* system interrupts to int line 1 */ | |
199 | ||
200 | /* CAN Bittiming constants as per HECC specs */ | |
201 | static struct can_bittiming_const ti_hecc_bittiming_const = { | |
202 | .name = DRV_NAME, | |
203 | .tseg1_min = 1, | |
204 | .tseg1_max = 16, | |
205 | .tseg2_min = 1, | |
206 | .tseg2_max = 8, | |
207 | .sjw_max = 4, | |
208 | .brp_min = 1, | |
209 | .brp_max = 256, | |
210 | .brp_inc = 1, | |
211 | }; | |
212 | ||
213 | struct ti_hecc_priv { | |
214 | struct can_priv can; /* MUST be first member/field */ | |
215 | struct napi_struct napi; | |
216 | struct net_device *ndev; | |
217 | struct clk *clk; | |
218 | void __iomem *base; | |
219 | u32 scc_ram_offset; | |
220 | u32 hecc_ram_offset; | |
221 | u32 mbx_offset; | |
222 | u32 int_line; | |
223 | spinlock_t mbx_lock; /* CANME register needs protection */ | |
224 | u32 tx_head; | |
225 | u32 tx_tail; | |
226 | u32 rx_next; | |
227 | }; | |
228 | ||
229 | static inline int get_tx_head_mb(struct ti_hecc_priv *priv) | |
230 | { | |
231 | return priv->tx_head & HECC_TX_MB_MASK; | |
232 | } | |
233 | ||
234 | static inline int get_tx_tail_mb(struct ti_hecc_priv *priv) | |
235 | { | |
236 | return priv->tx_tail & HECC_TX_MB_MASK; | |
237 | } | |
238 | ||
239 | static inline int get_tx_head_prio(struct ti_hecc_priv *priv) | |
240 | { | |
241 | return (priv->tx_head >> HECC_TX_PRIO_SHIFT) & MAX_TX_PRIO; | |
242 | } | |
243 | ||
244 | static inline void hecc_write_lam(struct ti_hecc_priv *priv, u32 mbxno, u32 val) | |
245 | { | |
246 | __raw_writel(val, priv->base + priv->hecc_ram_offset + mbxno * 4); | |
247 | } | |
248 | ||
249 | static inline void hecc_write_mbx(struct ti_hecc_priv *priv, u32 mbxno, | |
250 | u32 reg, u32 val) | |
251 | { | |
252 | __raw_writel(val, priv->base + priv->mbx_offset + mbxno * 0x10 + | |
253 | reg); | |
254 | } | |
255 | ||
256 | static inline u32 hecc_read_mbx(struct ti_hecc_priv *priv, u32 mbxno, u32 reg) | |
257 | { | |
258 | return __raw_readl(priv->base + priv->mbx_offset + mbxno * 0x10 + | |
259 | reg); | |
260 | } | |
261 | ||
262 | static inline void hecc_write(struct ti_hecc_priv *priv, u32 reg, u32 val) | |
263 | { | |
264 | __raw_writel(val, priv->base + reg); | |
265 | } | |
266 | ||
267 | static inline u32 hecc_read(struct ti_hecc_priv *priv, int reg) | |
268 | { | |
269 | return __raw_readl(priv->base + reg); | |
270 | } | |
271 | ||
272 | static inline void hecc_set_bit(struct ti_hecc_priv *priv, int reg, | |
273 | u32 bit_mask) | |
274 | { | |
275 | hecc_write(priv, reg, hecc_read(priv, reg) | bit_mask); | |
276 | } | |
277 | ||
278 | static inline void hecc_clear_bit(struct ti_hecc_priv *priv, int reg, | |
279 | u32 bit_mask) | |
280 | { | |
281 | hecc_write(priv, reg, hecc_read(priv, reg) & ~bit_mask); | |
282 | } | |
283 | ||
284 | static inline u32 hecc_get_bit(struct ti_hecc_priv *priv, int reg, u32 bit_mask) | |
285 | { | |
286 | return (hecc_read(priv, reg) & bit_mask) ? 1 : 0; | |
287 | } | |
288 | ||
289 | static int ti_hecc_get_state(const struct net_device *ndev, | |
290 | enum can_state *state) | |
291 | { | |
292 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
293 | ||
294 | *state = priv->can.state; | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int ti_hecc_set_btc(struct ti_hecc_priv *priv) | |
299 | { | |
300 | struct can_bittiming *bit_timing = &priv->can.bittiming; | |
301 | u32 can_btc; | |
302 | ||
303 | can_btc = (bit_timing->phase_seg2 - 1) & 0x7; | |
304 | can_btc |= ((bit_timing->phase_seg1 + bit_timing->prop_seg - 1) | |
305 | & 0xF) << 3; | |
306 | if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) { | |
307 | if (bit_timing->brp > 4) | |
308 | can_btc |= HECC_CANBTC_SAM; | |
309 | else | |
310 | dev_warn(priv->ndev->dev.parent, "WARN: Triple" \ | |
311 | "sampling not set due to h/w limitations"); | |
312 | } | |
313 | can_btc |= ((bit_timing->sjw - 1) & 0x3) << 8; | |
314 | can_btc |= ((bit_timing->brp - 1) & 0xFF) << 16; | |
315 | ||
316 | /* ERM being set to 0 by default meaning resync at falling edge */ | |
317 | ||
318 | hecc_write(priv, HECC_CANBTC, can_btc); | |
319 | dev_info(priv->ndev->dev.parent, "setting CANBTC=%#x\n", can_btc); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static void ti_hecc_reset(struct net_device *ndev) | |
325 | { | |
326 | u32 cnt; | |
327 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
328 | ||
329 | dev_dbg(ndev->dev.parent, "resetting hecc ...\n"); | |
330 | hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_SRES); | |
331 | ||
332 | /* Set change control request and wait till enabled */ | |
333 | hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_CCR); | |
334 | ||
335 | /* | |
336 | * INFO: It has been observed that at times CCE bit may not be | |
337 | * set and hw seems to be ok even if this bit is not set so | |
338 | * timing out with a timing of 1ms to respect the specs | |
339 | */ | |
340 | cnt = HECC_CCE_WAIT_COUNT; | |
341 | while (!hecc_get_bit(priv, HECC_CANES, HECC_CANES_CCE) && cnt != 0) { | |
342 | --cnt; | |
343 | udelay(10); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Note: On HECC, BTC can be programmed only in initialization mode, so | |
348 | * it is expected that the can bittiming parameters are set via ip | |
349 | * utility before the device is opened | |
350 | */ | |
351 | ti_hecc_set_btc(priv); | |
352 | ||
353 | /* Clear CCR (and CANMC register) and wait for CCE = 0 enable */ | |
354 | hecc_write(priv, HECC_CANMC, 0); | |
355 | ||
356 | /* | |
357 | * INFO: CAN net stack handles bus off and hence disabling auto-bus-on | |
358 | * hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_ABO); | |
359 | */ | |
360 | ||
361 | /* | |
362 | * INFO: It has been observed that at times CCE bit may not be | |
363 | * set and hw seems to be ok even if this bit is not set so | |
364 | */ | |
365 | cnt = HECC_CCE_WAIT_COUNT; | |
366 | while (hecc_get_bit(priv, HECC_CANES, HECC_CANES_CCE) && cnt != 0) { | |
367 | --cnt; | |
368 | udelay(10); | |
369 | } | |
370 | ||
371 | /* Enable TX and RX I/O Control pins */ | |
372 | hecc_write(priv, HECC_CANTIOC, HECC_CANTIOC_EN); | |
373 | hecc_write(priv, HECC_CANRIOC, HECC_CANRIOC_EN); | |
374 | ||
375 | /* Clear registers for clean operation */ | |
376 | hecc_write(priv, HECC_CANTA, HECC_SET_REG); | |
377 | hecc_write(priv, HECC_CANRMP, HECC_SET_REG); | |
378 | hecc_write(priv, HECC_CANGIF0, HECC_SET_REG); | |
379 | hecc_write(priv, HECC_CANGIF1, HECC_SET_REG); | |
380 | hecc_write(priv, HECC_CANME, 0); | |
381 | hecc_write(priv, HECC_CANMD, 0); | |
382 | ||
383 | /* SCC compat mode NOT supported (and not needed too) */ | |
384 | hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_SCM); | |
385 | } | |
386 | ||
387 | static void ti_hecc_start(struct net_device *ndev) | |
388 | { | |
389 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
390 | u32 cnt, mbxno, mbx_mask; | |
391 | ||
392 | /* put HECC in initialization mode and set btc */ | |
393 | ti_hecc_reset(ndev); | |
394 | ||
395 | priv->tx_head = priv->tx_tail = HECC_TX_MASK; | |
396 | priv->rx_next = HECC_RX_FIRST_MBOX; | |
397 | ||
398 | /* Enable local and global acceptance mask registers */ | |
399 | hecc_write(priv, HECC_CANGAM, HECC_SET_REG); | |
400 | ||
401 | /* Prepare configured mailboxes to receive messages */ | |
402 | for (cnt = 0; cnt < HECC_MAX_RX_MBOX; cnt++) { | |
403 | mbxno = HECC_MAX_MAILBOXES - 1 - cnt; | |
404 | mbx_mask = BIT(mbxno); | |
405 | hecc_clear_bit(priv, HECC_CANME, mbx_mask); | |
406 | hecc_write_mbx(priv, mbxno, HECC_CANMID, HECC_CANMID_AME); | |
407 | hecc_write_lam(priv, mbxno, HECC_SET_REG); | |
408 | hecc_set_bit(priv, HECC_CANMD, mbx_mask); | |
409 | hecc_set_bit(priv, HECC_CANME, mbx_mask); | |
410 | hecc_set_bit(priv, HECC_CANMIM, mbx_mask); | |
411 | } | |
412 | ||
413 | /* Prevent message over-write & Enable interrupts */ | |
414 | hecc_write(priv, HECC_CANOPC, HECC_SET_REG); | |
415 | if (priv->int_line) { | |
416 | hecc_write(priv, HECC_CANMIL, HECC_SET_REG); | |
417 | hecc_write(priv, HECC_CANGIM, HECC_CANGIM_DEF_MASK | | |
418 | HECC_CANGIM_I1EN | HECC_CANGIM_SIL); | |
419 | } else { | |
420 | hecc_write(priv, HECC_CANMIL, 0); | |
421 | hecc_write(priv, HECC_CANGIM, | |
422 | HECC_CANGIM_DEF_MASK | HECC_CANGIM_I0EN); | |
423 | } | |
424 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
425 | } | |
426 | ||
427 | static void ti_hecc_stop(struct net_device *ndev) | |
428 | { | |
429 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
430 | ||
431 | /* Disable interrupts and disable mailboxes */ | |
432 | hecc_write(priv, HECC_CANGIM, 0); | |
433 | hecc_write(priv, HECC_CANMIM, 0); | |
434 | hecc_write(priv, HECC_CANME, 0); | |
435 | priv->can.state = CAN_STATE_STOPPED; | |
436 | } | |
437 | ||
438 | static int ti_hecc_do_set_mode(struct net_device *ndev, enum can_mode mode) | |
439 | { | |
440 | int ret = 0; | |
441 | ||
442 | switch (mode) { | |
443 | case CAN_MODE_START: | |
444 | ti_hecc_start(ndev); | |
445 | netif_wake_queue(ndev); | |
446 | break; | |
447 | default: | |
448 | ret = -EOPNOTSUPP; | |
449 | break; | |
450 | } | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | /* | |
456 | * ti_hecc_xmit: HECC Transmit | |
457 | * | |
458 | * The transmit mailboxes start from 0 to HECC_MAX_TX_MBOX. In HECC the | |
459 | * priority of the mailbox for tranmission is dependent upon priority setting | |
460 | * field in mailbox registers. The mailbox with highest value in priority field | |
461 | * is transmitted first. Only when two mailboxes have the same value in | |
462 | * priority field the highest numbered mailbox is transmitted first. | |
463 | * | |
464 | * To utilize the HECC priority feature as described above we start with the | |
465 | * highest numbered mailbox with highest priority level and move on to the next | |
466 | * mailbox with the same priority level and so on. Once we loop through all the | |
467 | * transmit mailboxes we choose the next priority level (lower) and so on | |
468 | * until we reach the lowest priority level on the lowest numbered mailbox | |
469 | * when we stop transmission until all mailboxes are transmitted and then | |
470 | * restart at highest numbered mailbox with highest priority. | |
471 | * | |
472 | * Two counters (head and tail) are used to track the next mailbox to transmit | |
473 | * and to track the echo buffer for already transmitted mailbox. The queue | |
474 | * is stopped when all the mailboxes are busy or when there is a priority | |
475 | * value roll-over happens. | |
476 | */ | |
477 | static netdev_tx_t ti_hecc_xmit(struct sk_buff *skb, struct net_device *ndev) | |
478 | { | |
479 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
480 | struct can_frame *cf = (struct can_frame *)skb->data; | |
481 | u32 mbxno, mbx_mask, data; | |
482 | unsigned long flags; | |
483 | ||
484 | mbxno = get_tx_head_mb(priv); | |
485 | mbx_mask = BIT(mbxno); | |
486 | spin_lock_irqsave(&priv->mbx_lock, flags); | |
487 | if (unlikely(hecc_read(priv, HECC_CANME) & mbx_mask)) { | |
488 | spin_unlock_irqrestore(&priv->mbx_lock, flags); | |
489 | netif_stop_queue(ndev); | |
490 | dev_err(priv->ndev->dev.parent, | |
491 | "BUG: TX mbx not ready tx_head=%08X, tx_tail=%08X\n", | |
492 | priv->tx_head, priv->tx_tail); | |
493 | return NETDEV_TX_BUSY; | |
494 | } | |
495 | spin_unlock_irqrestore(&priv->mbx_lock, flags); | |
496 | ||
497 | /* Prepare mailbox for transmission */ | |
498 | data = min_t(u8, cf->can_dlc, 8); | |
499 | if (cf->can_id & CAN_RTR_FLAG) /* Remote transmission request */ | |
500 | data |= HECC_CANMCF_RTR; | |
501 | data |= get_tx_head_prio(priv) << 8; | |
502 | hecc_write_mbx(priv, mbxno, HECC_CANMCF, data); | |
503 | ||
504 | if (cf->can_id & CAN_EFF_FLAG) /* Extended frame format */ | |
505 | data = (cf->can_id & CAN_EFF_MASK) | HECC_CANMID_IDE; | |
506 | else /* Standard frame format */ | |
507 | data = (cf->can_id & CAN_SFF_MASK) << 18; | |
508 | hecc_write_mbx(priv, mbxno, HECC_CANMID, data); | |
509 | hecc_write_mbx(priv, mbxno, HECC_CANMDL, | |
510 | be32_to_cpu(*(u32 *)(cf->data))); | |
511 | if (cf->can_dlc > 4) | |
512 | hecc_write_mbx(priv, mbxno, HECC_CANMDH, | |
513 | be32_to_cpu(*(u32 *)(cf->data + 4))); | |
514 | else | |
515 | *(u32 *)(cf->data + 4) = 0; | |
516 | can_put_echo_skb(skb, ndev, mbxno); | |
517 | ||
518 | spin_lock_irqsave(&priv->mbx_lock, flags); | |
519 | --priv->tx_head; | |
520 | if ((hecc_read(priv, HECC_CANME) & BIT(get_tx_head_mb(priv))) || | |
521 | (priv->tx_head & HECC_TX_MASK) == HECC_TX_MASK) { | |
522 | netif_stop_queue(ndev); | |
523 | } | |
524 | hecc_set_bit(priv, HECC_CANME, mbx_mask); | |
525 | spin_unlock_irqrestore(&priv->mbx_lock, flags); | |
526 | ||
527 | hecc_clear_bit(priv, HECC_CANMD, mbx_mask); | |
528 | hecc_set_bit(priv, HECC_CANMIM, mbx_mask); | |
529 | hecc_write(priv, HECC_CANTRS, mbx_mask); | |
530 | ||
531 | return NETDEV_TX_OK; | |
532 | } | |
533 | ||
534 | static int ti_hecc_rx_pkt(struct ti_hecc_priv *priv, int mbxno) | |
535 | { | |
536 | struct net_device_stats *stats = &priv->ndev->stats; | |
537 | struct can_frame *cf; | |
538 | struct sk_buff *skb; | |
539 | u32 data, mbx_mask; | |
540 | unsigned long flags; | |
541 | ||
542 | skb = netdev_alloc_skb(priv->ndev, sizeof(struct can_frame)); | |
543 | if (!skb) { | |
544 | if (printk_ratelimit()) | |
545 | dev_err(priv->ndev->dev.parent, | |
546 | "ti_hecc_rx_pkt: netdev_alloc_skb() failed\n"); | |
547 | return -ENOMEM; | |
548 | } | |
549 | skb->protocol = __constant_htons(ETH_P_CAN); | |
550 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
551 | ||
552 | mbx_mask = BIT(mbxno); | |
553 | cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); | |
554 | data = hecc_read_mbx(priv, mbxno, HECC_CANMID); | |
555 | if (data & HECC_CANMID_IDE) | |
556 | cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG; | |
557 | else | |
558 | cf->can_id = (data >> 18) & CAN_SFF_MASK; | |
559 | data = hecc_read_mbx(priv, mbxno, HECC_CANMCF); | |
560 | if (data & HECC_CANMCF_RTR) | |
561 | cf->can_id |= CAN_RTR_FLAG; | |
562 | cf->can_dlc = data & 0xF; | |
563 | data = hecc_read_mbx(priv, mbxno, HECC_CANMDL); | |
564 | *(u32 *)(cf->data) = cpu_to_be32(data); | |
565 | if (cf->can_dlc > 4) { | |
566 | data = hecc_read_mbx(priv, mbxno, HECC_CANMDH); | |
567 | *(u32 *)(cf->data + 4) = cpu_to_be32(data); | |
568 | } else { | |
569 | *(u32 *)(cf->data + 4) = 0; | |
570 | } | |
571 | spin_lock_irqsave(&priv->mbx_lock, flags); | |
572 | hecc_clear_bit(priv, HECC_CANME, mbx_mask); | |
573 | hecc_write(priv, HECC_CANRMP, mbx_mask); | |
574 | /* enable mailbox only if it is part of rx buffer mailboxes */ | |
575 | if (priv->rx_next < HECC_RX_BUFFER_MBOX) | |
576 | hecc_set_bit(priv, HECC_CANME, mbx_mask); | |
577 | spin_unlock_irqrestore(&priv->mbx_lock, flags); | |
578 | ||
579 | stats->rx_bytes += cf->can_dlc; | |
580 | netif_receive_skb(skb); | |
581 | stats->rx_packets++; | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | /* | |
587 | * ti_hecc_rx_poll - HECC receive pkts | |
588 | * | |
589 | * The receive mailboxes start from highest numbered mailbox till last xmit | |
590 | * mailbox. On CAN frame reception the hardware places the data into highest | |
591 | * numbered mailbox that matches the CAN ID filter. Since all receive mailboxes | |
592 | * have same filtering (ALL CAN frames) packets will arrive in the highest | |
593 | * available RX mailbox and we need to ensure in-order packet reception. | |
594 | * | |
595 | * To ensure the packets are received in the right order we logically divide | |
596 | * the RX mailboxes into main and buffer mailboxes. Packets are received as per | |
597 | * mailbox priotity (higher to lower) in the main bank and once it is full we | |
598 | * disable further reception into main mailboxes. While the main mailboxes are | |
599 | * processed in NAPI, further packets are received in buffer mailboxes. | |
600 | * | |
601 | * We maintain a RX next mailbox counter to process packets and once all main | |
602 | * mailboxe packets are passed to the upper stack we enable all of them but | |
603 | * continue to process packets received in buffer mailboxes. With each packet | |
604 | * received from buffer mailbox we enable it immediately so as to handle the | |
605 | * overflow from higher mailboxes. | |
606 | */ | |
607 | static int ti_hecc_rx_poll(struct napi_struct *napi, int quota) | |
608 | { | |
609 | struct net_device *ndev = napi->dev; | |
610 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
611 | u32 num_pkts = 0; | |
612 | u32 mbx_mask; | |
613 | unsigned long pending_pkts, flags; | |
614 | ||
615 | if (!netif_running(ndev)) | |
616 | return 0; | |
617 | ||
618 | while ((pending_pkts = hecc_read(priv, HECC_CANRMP)) && | |
619 | num_pkts < quota) { | |
620 | mbx_mask = BIT(priv->rx_next); /* next rx mailbox to process */ | |
621 | if (mbx_mask & pending_pkts) { | |
622 | if (ti_hecc_rx_pkt(priv, priv->rx_next) < 0) | |
623 | return num_pkts; | |
624 | ++num_pkts; | |
625 | } else if (priv->rx_next > HECC_RX_BUFFER_MBOX) { | |
626 | break; /* pkt not received yet */ | |
627 | } | |
628 | --priv->rx_next; | |
629 | if (priv->rx_next == HECC_RX_BUFFER_MBOX) { | |
630 | /* enable high bank mailboxes */ | |
631 | spin_lock_irqsave(&priv->mbx_lock, flags); | |
632 | mbx_mask = hecc_read(priv, HECC_CANME); | |
633 | mbx_mask |= HECC_RX_HIGH_MBOX_MASK; | |
634 | hecc_write(priv, HECC_CANME, mbx_mask); | |
635 | spin_unlock_irqrestore(&priv->mbx_lock, flags); | |
636 | } else if (priv->rx_next == HECC_MAX_TX_MBOX - 1) { | |
637 | priv->rx_next = HECC_RX_FIRST_MBOX; | |
638 | break; | |
639 | } | |
640 | } | |
641 | ||
642 | /* Enable packet interrupt if all pkts are handled */ | |
643 | if (hecc_read(priv, HECC_CANRMP) == 0) { | |
644 | napi_complete(napi); | |
645 | /* Re-enable RX mailbox interrupts */ | |
646 | mbx_mask = hecc_read(priv, HECC_CANMIM); | |
647 | mbx_mask |= HECC_TX_MBOX_MASK; | |
648 | hecc_write(priv, HECC_CANMIM, mbx_mask); | |
649 | } | |
650 | ||
651 | return num_pkts; | |
652 | } | |
653 | ||
654 | static int ti_hecc_error(struct net_device *ndev, int int_status, | |
655 | int err_status) | |
656 | { | |
657 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
658 | struct net_device_stats *stats = &ndev->stats; | |
659 | struct can_frame *cf; | |
660 | struct sk_buff *skb; | |
661 | ||
662 | /* propogate the error condition to the can stack */ | |
663 | skb = netdev_alloc_skb(ndev, sizeof(struct can_frame)); | |
664 | if (!skb) { | |
665 | if (printk_ratelimit()) | |
666 | dev_err(priv->ndev->dev.parent, | |
667 | "ti_hecc_error: netdev_alloc_skb() failed\n"); | |
668 | return -ENOMEM; | |
669 | } | |
670 | skb->protocol = __constant_htons(ETH_P_CAN); | |
671 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
672 | cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); | |
673 | memset(cf, 0, sizeof(struct can_frame)); | |
674 | cf->can_id = CAN_ERR_FLAG; | |
675 | cf->can_dlc = CAN_ERR_DLC; | |
676 | ||
677 | if (int_status & HECC_CANGIF_WLIF) { /* warning level int */ | |
678 | if ((int_status & HECC_CANGIF_BOIF) == 0) { | |
679 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
680 | ++priv->can.can_stats.error_warning; | |
681 | cf->can_id |= CAN_ERR_CRTL; | |
682 | if (hecc_read(priv, HECC_CANTEC) > 96) | |
683 | cf->data[1] |= CAN_ERR_CRTL_TX_WARNING; | |
684 | if (hecc_read(priv, HECC_CANREC) > 96) | |
685 | cf->data[1] |= CAN_ERR_CRTL_RX_WARNING; | |
686 | } | |
687 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_EW); | |
688 | dev_dbg(priv->ndev->dev.parent, "Error Warning interrupt\n"); | |
689 | hecc_clear_bit(priv, HECC_CANMC, HECC_CANMC_CCR); | |
690 | } | |
691 | ||
692 | if (int_status & HECC_CANGIF_EPIF) { /* error passive int */ | |
693 | if ((int_status & HECC_CANGIF_BOIF) == 0) { | |
694 | priv->can.state = CAN_STATE_ERROR_PASSIVE; | |
695 | ++priv->can.can_stats.error_passive; | |
696 | cf->can_id |= CAN_ERR_CRTL; | |
697 | if (hecc_read(priv, HECC_CANTEC) > 127) | |
698 | cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; | |
699 | if (hecc_read(priv, HECC_CANREC) > 127) | |
700 | cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; | |
701 | } | |
702 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_EP); | |
703 | dev_dbg(priv->ndev->dev.parent, "Error passive interrupt\n"); | |
704 | hecc_clear_bit(priv, HECC_CANMC, HECC_CANMC_CCR); | |
705 | } | |
706 | ||
707 | /* | |
708 | * Need to check busoff condition in error status register too to | |
709 | * ensure warning interrupts don't hog the system | |
710 | */ | |
711 | if ((int_status & HECC_CANGIF_BOIF) || (err_status & HECC_CANES_BO)) { | |
712 | priv->can.state = CAN_STATE_BUS_OFF; | |
713 | cf->can_id |= CAN_ERR_BUSOFF; | |
714 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_BO); | |
715 | hecc_clear_bit(priv, HECC_CANMC, HECC_CANMC_CCR); | |
716 | /* Disable all interrupts in bus-off to avoid int hog */ | |
717 | hecc_write(priv, HECC_CANGIM, 0); | |
718 | can_bus_off(ndev); | |
719 | } | |
720 | ||
721 | if (err_status & HECC_BUS_ERROR) { | |
722 | ++priv->can.can_stats.bus_error; | |
723 | cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT; | |
724 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; | |
725 | if (err_status & HECC_CANES_FE) { | |
726 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_FE); | |
727 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
728 | } | |
729 | if (err_status & HECC_CANES_BE) { | |
730 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_BE); | |
731 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
732 | } | |
733 | if (err_status & HECC_CANES_SE) { | |
734 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_SE); | |
735 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
736 | } | |
737 | if (err_status & HECC_CANES_CRCE) { | |
738 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_CRCE); | |
739 | cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ | | |
740 | CAN_ERR_PROT_LOC_CRC_DEL; | |
741 | } | |
742 | if (err_status & HECC_CANES_ACKE) { | |
743 | hecc_set_bit(priv, HECC_CANES, HECC_CANES_ACKE); | |
744 | cf->data[2] |= CAN_ERR_PROT_LOC_ACK | | |
745 | CAN_ERR_PROT_LOC_ACK_DEL; | |
746 | } | |
747 | } | |
748 | ||
749 | netif_receive_skb(skb); | |
750 | stats->rx_packets++; | |
751 | stats->rx_bytes += cf->can_dlc; | |
752 | return 0; | |
753 | } | |
754 | ||
755 | static irqreturn_t ti_hecc_interrupt(int irq, void *dev_id) | |
756 | { | |
757 | struct net_device *ndev = (struct net_device *)dev_id; | |
758 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
759 | struct net_device_stats *stats = &ndev->stats; | |
760 | u32 mbxno, mbx_mask, int_status, err_status; | |
761 | unsigned long ack, flags; | |
762 | ||
763 | int_status = hecc_read(priv, | |
764 | (priv->int_line) ? HECC_CANGIF1 : HECC_CANGIF0); | |
765 | ||
766 | if (!int_status) | |
767 | return IRQ_NONE; | |
768 | ||
769 | err_status = hecc_read(priv, HECC_CANES); | |
770 | if (err_status & (HECC_BUS_ERROR | HECC_CANES_BO | | |
771 | HECC_CANES_EP | HECC_CANES_EW)) | |
772 | ti_hecc_error(ndev, int_status, err_status); | |
773 | ||
774 | if (int_status & HECC_CANGIF_GMIF) { | |
775 | while (priv->tx_tail - priv->tx_head > 0) { | |
776 | mbxno = get_tx_tail_mb(priv); | |
777 | mbx_mask = BIT(mbxno); | |
778 | if (!(mbx_mask & hecc_read(priv, HECC_CANTA))) | |
779 | break; | |
780 | hecc_clear_bit(priv, HECC_CANMIM, mbx_mask); | |
781 | hecc_write(priv, HECC_CANTA, mbx_mask); | |
782 | spin_lock_irqsave(&priv->mbx_lock, flags); | |
783 | hecc_clear_bit(priv, HECC_CANME, mbx_mask); | |
784 | spin_unlock_irqrestore(&priv->mbx_lock, flags); | |
785 | stats->tx_bytes += hecc_read_mbx(priv, mbxno, | |
786 | HECC_CANMCF) & 0xF; | |
787 | stats->tx_packets++; | |
788 | can_get_echo_skb(ndev, mbxno); | |
789 | --priv->tx_tail; | |
790 | } | |
791 | ||
792 | /* restart queue if wrap-up or if queue stalled on last pkt */ | |
793 | if (((priv->tx_head == priv->tx_tail) && | |
794 | ((priv->tx_head & HECC_TX_MASK) != HECC_TX_MASK)) || | |
795 | (((priv->tx_tail & HECC_TX_MASK) == HECC_TX_MASK) && | |
796 | ((priv->tx_head & HECC_TX_MASK) == HECC_TX_MASK))) | |
797 | netif_wake_queue(ndev); | |
798 | ||
799 | /* Disable RX mailbox interrupts and let NAPI reenable them */ | |
800 | if (hecc_read(priv, HECC_CANRMP)) { | |
801 | ack = hecc_read(priv, HECC_CANMIM); | |
802 | ack &= BIT(HECC_MAX_TX_MBOX) - 1; | |
803 | hecc_write(priv, HECC_CANMIM, ack); | |
804 | napi_schedule(&priv->napi); | |
805 | } | |
806 | } | |
807 | ||
808 | /* clear all interrupt conditions - read back to avoid spurious ints */ | |
809 | if (priv->int_line) { | |
810 | hecc_write(priv, HECC_CANGIF1, HECC_SET_REG); | |
811 | int_status = hecc_read(priv, HECC_CANGIF1); | |
812 | } else { | |
813 | hecc_write(priv, HECC_CANGIF0, HECC_SET_REG); | |
814 | int_status = hecc_read(priv, HECC_CANGIF0); | |
815 | } | |
816 | ||
817 | return IRQ_HANDLED; | |
818 | } | |
819 | ||
820 | static int ti_hecc_open(struct net_device *ndev) | |
821 | { | |
822 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
823 | int err; | |
824 | ||
825 | err = request_irq(ndev->irq, ti_hecc_interrupt, IRQF_SHARED, | |
826 | ndev->name, ndev); | |
827 | if (err) { | |
828 | dev_err(ndev->dev.parent, "error requesting interrupt\n"); | |
829 | return err; | |
830 | } | |
831 | ||
832 | /* Open common can device */ | |
833 | err = open_candev(ndev); | |
834 | if (err) { | |
835 | dev_err(ndev->dev.parent, "open_candev() failed %d\n", err); | |
836 | free_irq(ndev->irq, ndev); | |
837 | return err; | |
838 | } | |
839 | ||
840 | clk_enable(priv->clk); | |
841 | ti_hecc_start(ndev); | |
842 | napi_enable(&priv->napi); | |
843 | netif_start_queue(ndev); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | static int ti_hecc_close(struct net_device *ndev) | |
849 | { | |
850 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
851 | ||
852 | netif_stop_queue(ndev); | |
853 | napi_disable(&priv->napi); | |
854 | ti_hecc_stop(ndev); | |
855 | free_irq(ndev->irq, ndev); | |
856 | clk_disable(priv->clk); | |
857 | close_candev(ndev); | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | static const struct net_device_ops ti_hecc_netdev_ops = { | |
863 | .ndo_open = ti_hecc_open, | |
864 | .ndo_stop = ti_hecc_close, | |
865 | .ndo_start_xmit = ti_hecc_xmit, | |
866 | }; | |
867 | ||
868 | static int ti_hecc_probe(struct platform_device *pdev) | |
869 | { | |
870 | struct net_device *ndev = (struct net_device *)0; | |
871 | struct ti_hecc_priv *priv; | |
872 | struct ti_hecc_platform_data *pdata; | |
873 | struct resource *mem, *irq; | |
874 | void __iomem *addr; | |
875 | int err = -ENODEV; | |
876 | ||
877 | pdata = pdev->dev.platform_data; | |
878 | if (!pdata) { | |
879 | dev_err(&pdev->dev, "No platform data\n"); | |
880 | goto probe_exit; | |
881 | } | |
882 | ||
883 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
884 | if (!mem) { | |
885 | dev_err(&pdev->dev, "No mem resources\n"); | |
886 | goto probe_exit; | |
887 | } | |
888 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
889 | if (!irq) { | |
890 | dev_err(&pdev->dev, "No irq resource\n"); | |
891 | goto probe_exit; | |
892 | } | |
893 | if (!request_mem_region(mem->start, resource_size(mem), pdev->name)) { | |
894 | dev_err(&pdev->dev, "HECC region already claimed\n"); | |
895 | err = -EBUSY; | |
896 | goto probe_exit; | |
897 | } | |
898 | addr = ioremap(mem->start, resource_size(mem)); | |
899 | if (!addr) { | |
900 | dev_err(&pdev->dev, "ioremap failed\n"); | |
901 | err = -ENOMEM; | |
902 | goto probe_exit_free_region; | |
903 | } | |
904 | ||
905 | ndev = alloc_candev(sizeof(struct ti_hecc_priv)); | |
906 | if (!ndev) { | |
907 | dev_err(&pdev->dev, "alloc_candev failed\n"); | |
908 | err = -ENOMEM; | |
909 | goto probe_exit_iounmap; | |
910 | } | |
911 | ||
912 | priv = netdev_priv(ndev); | |
913 | priv->ndev = ndev; | |
914 | priv->base = addr; | |
915 | priv->scc_ram_offset = pdata->scc_ram_offset; | |
916 | priv->hecc_ram_offset = pdata->hecc_ram_offset; | |
917 | priv->mbx_offset = pdata->mbx_offset; | |
918 | priv->int_line = pdata->int_line; | |
919 | ||
920 | priv->can.bittiming_const = &ti_hecc_bittiming_const; | |
921 | priv->can.do_set_mode = ti_hecc_do_set_mode; | |
922 | priv->can.do_get_state = ti_hecc_get_state; | |
923 | ||
924 | ndev->irq = irq->start; | |
925 | ndev->flags |= IFF_ECHO; | |
926 | platform_set_drvdata(pdev, ndev); | |
927 | SET_NETDEV_DEV(ndev, &pdev->dev); | |
928 | ndev->netdev_ops = &ti_hecc_netdev_ops; | |
929 | ||
930 | priv->clk = clk_get(&pdev->dev, "hecc_ck"); | |
931 | if (IS_ERR(priv->clk)) { | |
932 | dev_err(&pdev->dev, "No clock available\n"); | |
933 | err = PTR_ERR(priv->clk); | |
934 | priv->clk = NULL; | |
935 | goto probe_exit_candev; | |
936 | } | |
937 | priv->can.clock.freq = clk_get_rate(priv->clk); | |
938 | netif_napi_add(ndev, &priv->napi, ti_hecc_rx_poll, | |
939 | HECC_DEF_NAPI_WEIGHT); | |
940 | ||
941 | err = register_candev(ndev); | |
942 | if (err) { | |
943 | dev_err(&pdev->dev, "register_candev() failed\n"); | |
944 | goto probe_exit_clk; | |
945 | } | |
946 | dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%u)\n", | |
947 | priv->base, (u32) ndev->irq); | |
948 | ||
949 | return 0; | |
950 | ||
951 | probe_exit_clk: | |
952 | clk_put(priv->clk); | |
953 | probe_exit_candev: | |
954 | free_candev(ndev); | |
955 | probe_exit_iounmap: | |
956 | iounmap(addr); | |
957 | probe_exit_free_region: | |
958 | release_mem_region(mem->start, resource_size(mem)); | |
959 | probe_exit: | |
960 | return err; | |
961 | } | |
962 | ||
963 | static int __devexit ti_hecc_remove(struct platform_device *pdev) | |
964 | { | |
965 | struct resource *res; | |
966 | struct net_device *ndev = platform_get_drvdata(pdev); | |
967 | struct ti_hecc_priv *priv = netdev_priv(ndev); | |
968 | ||
969 | clk_put(priv->clk); | |
970 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
971 | iounmap(priv->base); | |
972 | release_mem_region(res->start, resource_size(res)); | |
973 | unregister_candev(ndev); | |
974 | free_candev(ndev); | |
975 | platform_set_drvdata(pdev, NULL); | |
976 | ||
977 | return 0; | |
978 | } | |
979 | ||
980 | /* TI HECC netdevice driver: platform driver structure */ | |
981 | static struct platform_driver ti_hecc_driver = { | |
982 | .driver = { | |
983 | .name = DRV_NAME, | |
984 | .owner = THIS_MODULE, | |
985 | }, | |
986 | .probe = ti_hecc_probe, | |
987 | .remove = __devexit_p(ti_hecc_remove), | |
988 | }; | |
989 | ||
990 | static int __init ti_hecc_init_driver(void) | |
991 | { | |
992 | printk(KERN_INFO DRV_DESC "\n"); | |
993 | return platform_driver_register(&ti_hecc_driver); | |
994 | } | |
995 | module_init(ti_hecc_init_driver); | |
996 | ||
997 | static void __exit ti_hecc_exit_driver(void) | |
998 | { | |
999 | printk(KERN_INFO DRV_DESC " unloaded\n"); | |
1000 | platform_driver_unregister(&ti_hecc_driver); | |
1001 | } | |
1002 | module_exit(ti_hecc_exit_driver); | |
1003 | ||
1004 | MODULE_AUTHOR("Anant Gole <anantgole@ti.com>"); | |
1005 | MODULE_LICENSE("GPL v2"); | |
1006 | MODULE_DESCRIPTION(DRV_DESC); |