Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1 | /* |
| 2 | * CAN bus driver for Bosch M_CAN controller |
| 3 | * |
| 4 | * Copyright (C) 2014 Freescale Semiconductor, Inc. |
| 5 | * Dong Aisheng <b29396@freescale.com> |
| 6 | * |
| 7 | * Bosch M_CAN user manual can be obtained from: |
| 8 | * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/ |
| 9 | * mcan_users_manual_v302.pdf |
| 10 | * |
| 11 | * This file is licensed under the terms of the GNU General Public |
| 12 | * License version 2. This program is licensed "as is" without any |
| 13 | * warranty of any kind, whether express or implied. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/of_device.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | |
| 27 | #include <linux/can/dev.h> |
| 28 | |
| 29 | /* napi related */ |
| 30 | #define M_CAN_NAPI_WEIGHT 64 |
| 31 | |
| 32 | /* message ram configuration data length */ |
| 33 | #define MRAM_CFG_LEN 8 |
| 34 | |
| 35 | /* registers definition */ |
| 36 | enum m_can_reg { |
| 37 | M_CAN_CREL = 0x0, |
| 38 | M_CAN_ENDN = 0x4, |
| 39 | M_CAN_CUST = 0x8, |
| 40 | M_CAN_FBTP = 0xc, |
| 41 | M_CAN_TEST = 0x10, |
| 42 | M_CAN_RWD = 0x14, |
| 43 | M_CAN_CCCR = 0x18, |
| 44 | M_CAN_BTP = 0x1c, |
| 45 | M_CAN_TSCC = 0x20, |
| 46 | M_CAN_TSCV = 0x24, |
| 47 | M_CAN_TOCC = 0x28, |
| 48 | M_CAN_TOCV = 0x2c, |
| 49 | M_CAN_ECR = 0x40, |
| 50 | M_CAN_PSR = 0x44, |
| 51 | M_CAN_IR = 0x50, |
| 52 | M_CAN_IE = 0x54, |
| 53 | M_CAN_ILS = 0x58, |
| 54 | M_CAN_ILE = 0x5c, |
| 55 | M_CAN_GFC = 0x80, |
| 56 | M_CAN_SIDFC = 0x84, |
| 57 | M_CAN_XIDFC = 0x88, |
| 58 | M_CAN_XIDAM = 0x90, |
| 59 | M_CAN_HPMS = 0x94, |
| 60 | M_CAN_NDAT1 = 0x98, |
| 61 | M_CAN_NDAT2 = 0x9c, |
| 62 | M_CAN_RXF0C = 0xa0, |
| 63 | M_CAN_RXF0S = 0xa4, |
| 64 | M_CAN_RXF0A = 0xa8, |
| 65 | M_CAN_RXBC = 0xac, |
| 66 | M_CAN_RXF1C = 0xb0, |
| 67 | M_CAN_RXF1S = 0xb4, |
| 68 | M_CAN_RXF1A = 0xb8, |
| 69 | M_CAN_RXESC = 0xbc, |
| 70 | M_CAN_TXBC = 0xc0, |
| 71 | M_CAN_TXFQS = 0xc4, |
| 72 | M_CAN_TXESC = 0xc8, |
| 73 | M_CAN_TXBRP = 0xcc, |
| 74 | M_CAN_TXBAR = 0xd0, |
| 75 | M_CAN_TXBCR = 0xd4, |
| 76 | M_CAN_TXBTO = 0xd8, |
| 77 | M_CAN_TXBCF = 0xdc, |
| 78 | M_CAN_TXBTIE = 0xe0, |
| 79 | M_CAN_TXBCIE = 0xe4, |
| 80 | M_CAN_TXEFC = 0xf0, |
| 81 | M_CAN_TXEFS = 0xf4, |
| 82 | M_CAN_TXEFA = 0xf8, |
| 83 | }; |
| 84 | |
| 85 | /* m_can lec values */ |
| 86 | enum m_can_lec_type { |
| 87 | LEC_NO_ERROR = 0, |
| 88 | LEC_STUFF_ERROR, |
| 89 | LEC_FORM_ERROR, |
| 90 | LEC_ACK_ERROR, |
| 91 | LEC_BIT1_ERROR, |
| 92 | LEC_BIT0_ERROR, |
| 93 | LEC_CRC_ERROR, |
| 94 | LEC_UNUSED, |
| 95 | }; |
| 96 | |
| 97 | enum m_can_mram_cfg { |
| 98 | MRAM_SIDF = 0, |
| 99 | MRAM_XIDF, |
| 100 | MRAM_RXF0, |
| 101 | MRAM_RXF1, |
| 102 | MRAM_RXB, |
| 103 | MRAM_TXE, |
| 104 | MRAM_TXB, |
| 105 | MRAM_CFG_NUM, |
| 106 | }; |
| 107 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 108 | /* Fast Bit Timing & Prescaler Register (FBTP) */ |
| 109 | #define FBTR_FBRP_MASK 0x1f |
| 110 | #define FBTR_FBRP_SHIFT 16 |
| 111 | #define FBTR_FTSEG1_SHIFT 8 |
| 112 | #define FBTR_FTSEG1_MASK (0xf << FBTR_FTSEG1_SHIFT) |
| 113 | #define FBTR_FTSEG2_SHIFT 4 |
| 114 | #define FBTR_FTSEG2_MASK (0x7 << FBTR_FTSEG2_SHIFT) |
| 115 | #define FBTR_FSJW_SHIFT 0 |
| 116 | #define FBTR_FSJW_MASK 0x3 |
| 117 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 118 | /* Test Register (TEST) */ |
| 119 | #define TEST_LBCK BIT(4) |
| 120 | |
| 121 | /* CC Control Register(CCCR) */ |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 122 | #define CCCR_TEST BIT(7) |
| 123 | #define CCCR_CMR_MASK 0x3 |
| 124 | #define CCCR_CMR_SHIFT 10 |
| 125 | #define CCCR_CMR_CANFD 0x1 |
| 126 | #define CCCR_CMR_CANFD_BRS 0x2 |
| 127 | #define CCCR_CMR_CAN 0x3 |
| 128 | #define CCCR_CME_MASK 0x3 |
| 129 | #define CCCR_CME_SHIFT 8 |
| 130 | #define CCCR_CME_CAN 0 |
| 131 | #define CCCR_CME_CANFD 0x1 |
| 132 | #define CCCR_CME_CANFD_BRS 0x2 |
| 133 | #define CCCR_TEST BIT(7) |
| 134 | #define CCCR_MON BIT(5) |
| 135 | #define CCCR_CCE BIT(1) |
| 136 | #define CCCR_INIT BIT(0) |
| 137 | #define CCCR_CANFD 0x10 |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 138 | |
| 139 | /* Bit Timing & Prescaler Register (BTP) */ |
| 140 | #define BTR_BRP_MASK 0x3ff |
| 141 | #define BTR_BRP_SHIFT 16 |
| 142 | #define BTR_TSEG1_SHIFT 8 |
| 143 | #define BTR_TSEG1_MASK (0x3f << BTR_TSEG1_SHIFT) |
| 144 | #define BTR_TSEG2_SHIFT 4 |
| 145 | #define BTR_TSEG2_MASK (0xf << BTR_TSEG2_SHIFT) |
| 146 | #define BTR_SJW_SHIFT 0 |
| 147 | #define BTR_SJW_MASK 0xf |
| 148 | |
| 149 | /* Error Counter Register(ECR) */ |
| 150 | #define ECR_RP BIT(15) |
| 151 | #define ECR_REC_SHIFT 8 |
| 152 | #define ECR_REC_MASK (0x7f << ECR_REC_SHIFT) |
| 153 | #define ECR_TEC_SHIFT 0 |
| 154 | #define ECR_TEC_MASK 0xff |
| 155 | |
| 156 | /* Protocol Status Register(PSR) */ |
| 157 | #define PSR_BO BIT(7) |
| 158 | #define PSR_EW BIT(6) |
| 159 | #define PSR_EP BIT(5) |
| 160 | #define PSR_LEC_MASK 0x7 |
| 161 | |
| 162 | /* Interrupt Register(IR) */ |
| 163 | #define IR_ALL_INT 0xffffffff |
| 164 | #define IR_STE BIT(31) |
| 165 | #define IR_FOE BIT(30) |
| 166 | #define IR_ACKE BIT(29) |
| 167 | #define IR_BE BIT(28) |
| 168 | #define IR_CRCE BIT(27) |
| 169 | #define IR_WDI BIT(26) |
| 170 | #define IR_BO BIT(25) |
| 171 | #define IR_EW BIT(24) |
| 172 | #define IR_EP BIT(23) |
| 173 | #define IR_ELO BIT(22) |
| 174 | #define IR_BEU BIT(21) |
| 175 | #define IR_BEC BIT(20) |
| 176 | #define IR_DRX BIT(19) |
| 177 | #define IR_TOO BIT(18) |
| 178 | #define IR_MRAF BIT(17) |
| 179 | #define IR_TSW BIT(16) |
| 180 | #define IR_TEFL BIT(15) |
| 181 | #define IR_TEFF BIT(14) |
| 182 | #define IR_TEFW BIT(13) |
| 183 | #define IR_TEFN BIT(12) |
| 184 | #define IR_TFE BIT(11) |
| 185 | #define IR_TCF BIT(10) |
| 186 | #define IR_TC BIT(9) |
| 187 | #define IR_HPM BIT(8) |
| 188 | #define IR_RF1L BIT(7) |
| 189 | #define IR_RF1F BIT(6) |
| 190 | #define IR_RF1W BIT(5) |
| 191 | #define IR_RF1N BIT(4) |
| 192 | #define IR_RF0L BIT(3) |
| 193 | #define IR_RF0F BIT(2) |
| 194 | #define IR_RF0W BIT(1) |
| 195 | #define IR_RF0N BIT(0) |
| 196 | #define IR_ERR_STATE (IR_BO | IR_EW | IR_EP) |
| 197 | #define IR_ERR_LEC (IR_STE | IR_FOE | IR_ACKE | IR_BE | IR_CRCE) |
| 198 | #define IR_ERR_BUS (IR_ERR_LEC | IR_WDI | IR_ELO | IR_BEU | \ |
| 199 | IR_BEC | IR_TOO | IR_MRAF | IR_TSW | IR_TEFL | \ |
| 200 | IR_RF1L | IR_RF0L) |
| 201 | #define IR_ERR_ALL (IR_ERR_STATE | IR_ERR_BUS) |
| 202 | |
| 203 | /* Interrupt Line Select (ILS) */ |
| 204 | #define ILS_ALL_INT0 0x0 |
| 205 | #define ILS_ALL_INT1 0xFFFFFFFF |
| 206 | |
| 207 | /* Interrupt Line Enable (ILE) */ |
| 208 | #define ILE_EINT0 BIT(0) |
| 209 | #define ILE_EINT1 BIT(1) |
| 210 | |
| 211 | /* Rx FIFO 0/1 Configuration (RXF0C/RXF1C) */ |
| 212 | #define RXFC_FWM_OFF 24 |
| 213 | #define RXFC_FWM_MASK 0x7f |
| 214 | #define RXFC_FWM_1 (1 << RXFC_FWM_OFF) |
| 215 | #define RXFC_FS_OFF 16 |
| 216 | #define RXFC_FS_MASK 0x7f |
| 217 | |
| 218 | /* Rx FIFO 0/1 Status (RXF0S/RXF1S) */ |
| 219 | #define RXFS_RFL BIT(25) |
| 220 | #define RXFS_FF BIT(24) |
| 221 | #define RXFS_FPI_OFF 16 |
| 222 | #define RXFS_FPI_MASK 0x3f0000 |
| 223 | #define RXFS_FGI_OFF 8 |
| 224 | #define RXFS_FGI_MASK 0x3f00 |
| 225 | #define RXFS_FFL_MASK 0x7f |
| 226 | |
| 227 | /* Rx Buffer / FIFO Element Size Configuration (RXESC) */ |
| 228 | #define M_CAN_RXESC_8BYTES 0x0 |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 229 | #define M_CAN_RXESC_64BYTES 0x777 |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 230 | |
| 231 | /* Tx Buffer Configuration(TXBC) */ |
| 232 | #define TXBC_NDTB_OFF 16 |
| 233 | #define TXBC_NDTB_MASK 0x3f |
| 234 | |
| 235 | /* Tx Buffer Element Size Configuration(TXESC) */ |
| 236 | #define TXESC_TBDS_8BYTES 0x0 |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 237 | #define TXESC_TBDS_64BYTES 0x7 |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 238 | |
| 239 | /* Tx Event FIFO Con.guration (TXEFC) */ |
| 240 | #define TXEFC_EFS_OFF 16 |
| 241 | #define TXEFC_EFS_MASK 0x3f |
| 242 | |
| 243 | /* Message RAM Configuration (in bytes) */ |
| 244 | #define SIDF_ELEMENT_SIZE 4 |
| 245 | #define XIDF_ELEMENT_SIZE 8 |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 246 | #define RXF0_ELEMENT_SIZE 72 |
| 247 | #define RXF1_ELEMENT_SIZE 72 |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 248 | #define RXB_ELEMENT_SIZE 16 |
| 249 | #define TXE_ELEMENT_SIZE 8 |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 250 | #define TXB_ELEMENT_SIZE 72 |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 251 | |
| 252 | /* Message RAM Elements */ |
| 253 | #define M_CAN_FIFO_ID 0x0 |
| 254 | #define M_CAN_FIFO_DLC 0x4 |
| 255 | #define M_CAN_FIFO_DATA(n) (0x8 + ((n) << 2)) |
| 256 | |
| 257 | /* Rx Buffer Element */ |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 258 | /* R0 */ |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 259 | #define RX_BUF_ESI BIT(31) |
| 260 | #define RX_BUF_XTD BIT(30) |
| 261 | #define RX_BUF_RTR BIT(29) |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 262 | /* R1 */ |
| 263 | #define RX_BUF_ANMF BIT(31) |
| 264 | #define RX_BUF_EDL BIT(21) |
| 265 | #define RX_BUF_BRS BIT(20) |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 266 | |
| 267 | /* Tx Buffer Element */ |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 268 | /* R0 */ |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 269 | #define TX_BUF_XTD BIT(30) |
| 270 | #define TX_BUF_RTR BIT(29) |
| 271 | |
| 272 | /* address offset and element number for each FIFO/Buffer in the Message RAM */ |
| 273 | struct mram_cfg { |
| 274 | u16 off; |
| 275 | u8 num; |
| 276 | }; |
| 277 | |
| 278 | /* m_can private data structure */ |
| 279 | struct m_can_priv { |
| 280 | struct can_priv can; /* must be the first member */ |
| 281 | struct napi_struct napi; |
| 282 | struct net_device *dev; |
| 283 | struct device *device; |
| 284 | struct clk *hclk; |
| 285 | struct clk *cclk; |
| 286 | void __iomem *base; |
| 287 | u32 irqstatus; |
| 288 | |
| 289 | /* message ram configuration */ |
| 290 | void __iomem *mram_base; |
| 291 | struct mram_cfg mcfg[MRAM_CFG_NUM]; |
| 292 | }; |
| 293 | |
| 294 | static inline u32 m_can_read(const struct m_can_priv *priv, enum m_can_reg reg) |
| 295 | { |
| 296 | return readl(priv->base + reg); |
| 297 | } |
| 298 | |
| 299 | static inline void m_can_write(const struct m_can_priv *priv, |
| 300 | enum m_can_reg reg, u32 val) |
| 301 | { |
| 302 | writel(val, priv->base + reg); |
| 303 | } |
| 304 | |
| 305 | static inline u32 m_can_fifo_read(const struct m_can_priv *priv, |
| 306 | u32 fgi, unsigned int offset) |
| 307 | { |
| 308 | return readl(priv->mram_base + priv->mcfg[MRAM_RXF0].off + |
| 309 | fgi * RXF0_ELEMENT_SIZE + offset); |
| 310 | } |
| 311 | |
| 312 | static inline void m_can_fifo_write(const struct m_can_priv *priv, |
| 313 | u32 fpi, unsigned int offset, u32 val) |
| 314 | { |
Marc Kleine-Budde | fba6f91 | 2015-03-14 15:39:09 +0100 | [diff] [blame] | 315 | writel(val, priv->mram_base + priv->mcfg[MRAM_TXB].off + |
| 316 | fpi * TXB_ELEMENT_SIZE + offset); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | static inline void m_can_config_endisable(const struct m_can_priv *priv, |
| 320 | bool enable) |
| 321 | { |
| 322 | u32 cccr = m_can_read(priv, M_CAN_CCCR); |
| 323 | u32 timeout = 10; |
| 324 | u32 val = 0; |
| 325 | |
| 326 | if (enable) { |
| 327 | /* enable m_can configuration */ |
| 328 | m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT); |
Dong Aisheng | 7660f63 | 2014-10-29 18:45:24 +0800 | [diff] [blame] | 329 | udelay(5); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 330 | /* CCCR.CCE can only be set/reset while CCCR.INIT = '1' */ |
| 331 | m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT | CCCR_CCE); |
| 332 | } else { |
| 333 | m_can_write(priv, M_CAN_CCCR, cccr & ~(CCCR_INIT | CCCR_CCE)); |
| 334 | } |
| 335 | |
| 336 | /* there's a delay for module initialization */ |
| 337 | if (enable) |
| 338 | val = CCCR_INIT | CCCR_CCE; |
| 339 | |
| 340 | while ((m_can_read(priv, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) { |
| 341 | if (timeout == 0) { |
| 342 | netdev_warn(priv->dev, "Failed to init module\n"); |
| 343 | return; |
| 344 | } |
| 345 | timeout--; |
| 346 | udelay(1); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | static inline void m_can_enable_all_interrupts(const struct m_can_priv *priv) |
| 351 | { |
| 352 | m_can_write(priv, M_CAN_ILE, ILE_EINT0 | ILE_EINT1); |
| 353 | } |
| 354 | |
| 355 | static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv) |
| 356 | { |
| 357 | m_can_write(priv, M_CAN_ILE, 0x0); |
| 358 | } |
| 359 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 360 | static void m_can_read_fifo(struct net_device *dev, u32 rxfs) |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 361 | { |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 362 | struct net_device_stats *stats = &dev->stats; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 363 | struct m_can_priv *priv = netdev_priv(dev); |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 364 | struct canfd_frame *cf; |
| 365 | struct sk_buff *skb; |
Dong Aisheng | 921f168 | 2014-11-18 19:00:54 +0800 | [diff] [blame] | 366 | u32 id, fgi, dlc; |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 367 | int i; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 368 | |
| 369 | /* calculate the fifo get index for where to read data */ |
| 370 | fgi = (rxfs & RXFS_FGI_MASK) >> RXFS_FGI_OFF; |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 371 | dlc = m_can_fifo_read(priv, fgi, M_CAN_FIFO_DLC); |
| 372 | if (dlc & RX_BUF_EDL) |
| 373 | skb = alloc_canfd_skb(dev, &cf); |
| 374 | else |
| 375 | skb = alloc_can_skb(dev, (struct can_frame **)&cf); |
| 376 | if (!skb) { |
| 377 | stats->rx_dropped++; |
| 378 | return; |
| 379 | } |
| 380 | |
| 381 | if (dlc & RX_BUF_EDL) |
| 382 | cf->len = can_dlc2len((dlc >> 16) & 0x0F); |
| 383 | else |
| 384 | cf->len = get_can_dlc((dlc >> 16) & 0x0F); |
| 385 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 386 | id = m_can_fifo_read(priv, fgi, M_CAN_FIFO_ID); |
| 387 | if (id & RX_BUF_XTD) |
| 388 | cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG; |
| 389 | else |
| 390 | cf->can_id = (id >> 18) & CAN_SFF_MASK; |
| 391 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 392 | if (id & RX_BUF_ESI) { |
| 393 | cf->flags |= CANFD_ESI; |
| 394 | netdev_dbg(dev, "ESI Error\n"); |
| 395 | } |
Dong Aisheng | 921f168 | 2014-11-18 19:00:54 +0800 | [diff] [blame] | 396 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 397 | if (!(dlc & RX_BUF_EDL) && (id & RX_BUF_RTR)) { |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 398 | cf->can_id |= CAN_RTR_FLAG; |
| 399 | } else { |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 400 | if (dlc & RX_BUF_BRS) |
| 401 | cf->flags |= CANFD_BRS; |
| 402 | |
| 403 | for (i = 0; i < cf->len; i += 4) |
| 404 | *(u32 *)(cf->data + i) = |
| 405 | m_can_fifo_read(priv, fgi, |
| 406 | M_CAN_FIFO_DATA(i / 4)); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | /* acknowledge rx fifo 0 */ |
| 410 | m_can_write(priv, M_CAN_RXF0A, fgi); |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 411 | |
| 412 | stats->rx_packets++; |
| 413 | stats->rx_bytes += cf->len; |
| 414 | |
| 415 | netif_receive_skb(skb); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | static int m_can_do_rx_poll(struct net_device *dev, int quota) |
| 419 | { |
| 420 | struct m_can_priv *priv = netdev_priv(dev); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 421 | u32 pkts = 0; |
| 422 | u32 rxfs; |
| 423 | |
| 424 | rxfs = m_can_read(priv, M_CAN_RXF0S); |
| 425 | if (!(rxfs & RXFS_FFL_MASK)) { |
| 426 | netdev_dbg(dev, "no messages in fifo0\n"); |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | while ((rxfs & RXFS_FFL_MASK) && (quota > 0)) { |
| 431 | if (rxfs & RXFS_RFL) |
| 432 | netdev_warn(dev, "Rx FIFO 0 Message Lost\n"); |
| 433 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 434 | m_can_read_fifo(dev, rxfs); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 435 | |
| 436 | quota--; |
| 437 | pkts++; |
| 438 | rxfs = m_can_read(priv, M_CAN_RXF0S); |
| 439 | } |
| 440 | |
| 441 | if (pkts) |
| 442 | can_led_event(dev, CAN_LED_EVENT_RX); |
| 443 | |
| 444 | return pkts; |
| 445 | } |
| 446 | |
| 447 | static int m_can_handle_lost_msg(struct net_device *dev) |
| 448 | { |
| 449 | struct net_device_stats *stats = &dev->stats; |
| 450 | struct sk_buff *skb; |
| 451 | struct can_frame *frame; |
| 452 | |
| 453 | netdev_err(dev, "msg lost in rxf0\n"); |
| 454 | |
| 455 | stats->rx_errors++; |
| 456 | stats->rx_over_errors++; |
| 457 | |
| 458 | skb = alloc_can_err_skb(dev, &frame); |
| 459 | if (unlikely(!skb)) |
| 460 | return 0; |
| 461 | |
| 462 | frame->can_id |= CAN_ERR_CRTL; |
| 463 | frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; |
| 464 | |
| 465 | netif_receive_skb(skb); |
| 466 | |
| 467 | return 1; |
| 468 | } |
| 469 | |
| 470 | static int m_can_handle_lec_err(struct net_device *dev, |
| 471 | enum m_can_lec_type lec_type) |
| 472 | { |
| 473 | struct m_can_priv *priv = netdev_priv(dev); |
| 474 | struct net_device_stats *stats = &dev->stats; |
| 475 | struct can_frame *cf; |
| 476 | struct sk_buff *skb; |
| 477 | |
| 478 | priv->can.can_stats.bus_error++; |
| 479 | stats->rx_errors++; |
| 480 | |
| 481 | /* propagate the error condition to the CAN stack */ |
| 482 | skb = alloc_can_err_skb(dev, &cf); |
| 483 | if (unlikely(!skb)) |
| 484 | return 0; |
| 485 | |
| 486 | /* check for 'last error code' which tells us the |
| 487 | * type of the last error to occur on the CAN bus |
| 488 | */ |
| 489 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
| 490 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; |
| 491 | |
| 492 | switch (lec_type) { |
| 493 | case LEC_STUFF_ERROR: |
| 494 | netdev_dbg(dev, "stuff error\n"); |
| 495 | cf->data[2] |= CAN_ERR_PROT_STUFF; |
| 496 | break; |
| 497 | case LEC_FORM_ERROR: |
| 498 | netdev_dbg(dev, "form error\n"); |
| 499 | cf->data[2] |= CAN_ERR_PROT_FORM; |
| 500 | break; |
| 501 | case LEC_ACK_ERROR: |
| 502 | netdev_dbg(dev, "ack error\n"); |
| 503 | cf->data[3] |= (CAN_ERR_PROT_LOC_ACK | |
| 504 | CAN_ERR_PROT_LOC_ACK_DEL); |
| 505 | break; |
| 506 | case LEC_BIT1_ERROR: |
| 507 | netdev_dbg(dev, "bit1 error\n"); |
| 508 | cf->data[2] |= CAN_ERR_PROT_BIT1; |
| 509 | break; |
| 510 | case LEC_BIT0_ERROR: |
| 511 | netdev_dbg(dev, "bit0 error\n"); |
| 512 | cf->data[2] |= CAN_ERR_PROT_BIT0; |
| 513 | break; |
| 514 | case LEC_CRC_ERROR: |
| 515 | netdev_dbg(dev, "CRC error\n"); |
| 516 | cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ | |
| 517 | CAN_ERR_PROT_LOC_CRC_DEL); |
| 518 | break; |
| 519 | default: |
| 520 | break; |
| 521 | } |
| 522 | |
| 523 | stats->rx_packets++; |
| 524 | stats->rx_bytes += cf->can_dlc; |
| 525 | netif_receive_skb(skb); |
| 526 | |
| 527 | return 1; |
| 528 | } |
| 529 | |
Dong Aisheng | f6a9964 | 2014-10-29 18:45:21 +0800 | [diff] [blame] | 530 | static int __m_can_get_berr_counter(const struct net_device *dev, |
| 531 | struct can_berr_counter *bec) |
| 532 | { |
| 533 | struct m_can_priv *priv = netdev_priv(dev); |
| 534 | unsigned int ecr; |
| 535 | |
| 536 | ecr = m_can_read(priv, M_CAN_ECR); |
| 537 | bec->rxerr = (ecr & ECR_REC_MASK) >> ECR_REC_SHIFT; |
| 538 | bec->txerr = ecr & ECR_TEC_MASK; |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 543 | static int m_can_get_berr_counter(const struct net_device *dev, |
| 544 | struct can_berr_counter *bec) |
| 545 | { |
| 546 | struct m_can_priv *priv = netdev_priv(dev); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 547 | int err; |
| 548 | |
| 549 | err = clk_prepare_enable(priv->hclk); |
| 550 | if (err) |
| 551 | return err; |
| 552 | |
| 553 | err = clk_prepare_enable(priv->cclk); |
| 554 | if (err) { |
| 555 | clk_disable_unprepare(priv->hclk); |
| 556 | return err; |
| 557 | } |
| 558 | |
Dong Aisheng | f6a9964 | 2014-10-29 18:45:21 +0800 | [diff] [blame] | 559 | __m_can_get_berr_counter(dev, bec); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 560 | |
| 561 | clk_disable_unprepare(priv->cclk); |
| 562 | clk_disable_unprepare(priv->hclk); |
| 563 | |
| 564 | return 0; |
| 565 | } |
| 566 | |
| 567 | static int m_can_handle_state_change(struct net_device *dev, |
| 568 | enum can_state new_state) |
| 569 | { |
| 570 | struct m_can_priv *priv = netdev_priv(dev); |
| 571 | struct net_device_stats *stats = &dev->stats; |
| 572 | struct can_frame *cf; |
| 573 | struct sk_buff *skb; |
| 574 | struct can_berr_counter bec; |
| 575 | unsigned int ecr; |
| 576 | |
| 577 | switch (new_state) { |
| 578 | case CAN_STATE_ERROR_ACTIVE: |
| 579 | /* error warning state */ |
| 580 | priv->can.can_stats.error_warning++; |
| 581 | priv->can.state = CAN_STATE_ERROR_WARNING; |
| 582 | break; |
| 583 | case CAN_STATE_ERROR_PASSIVE: |
| 584 | /* error passive state */ |
| 585 | priv->can.can_stats.error_passive++; |
| 586 | priv->can.state = CAN_STATE_ERROR_PASSIVE; |
| 587 | break; |
| 588 | case CAN_STATE_BUS_OFF: |
| 589 | /* bus-off state */ |
| 590 | priv->can.state = CAN_STATE_BUS_OFF; |
| 591 | m_can_disable_all_interrupts(priv); |
Andri Yngvason | be38a6f | 2015-01-16 14:30:28 +0000 | [diff] [blame] | 592 | priv->can.can_stats.bus_off++; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 593 | can_bus_off(dev); |
| 594 | break; |
| 595 | default: |
| 596 | break; |
| 597 | } |
| 598 | |
| 599 | /* propagate the error condition to the CAN stack */ |
| 600 | skb = alloc_can_err_skb(dev, &cf); |
| 601 | if (unlikely(!skb)) |
| 602 | return 0; |
| 603 | |
Dong Aisheng | f6a9964 | 2014-10-29 18:45:21 +0800 | [diff] [blame] | 604 | __m_can_get_berr_counter(dev, &bec); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 605 | |
| 606 | switch (new_state) { |
| 607 | case CAN_STATE_ERROR_ACTIVE: |
| 608 | /* error warning state */ |
| 609 | cf->can_id |= CAN_ERR_CRTL; |
| 610 | cf->data[1] = (bec.txerr > bec.rxerr) ? |
| 611 | CAN_ERR_CRTL_TX_WARNING : |
| 612 | CAN_ERR_CRTL_RX_WARNING; |
| 613 | cf->data[6] = bec.txerr; |
| 614 | cf->data[7] = bec.rxerr; |
| 615 | break; |
| 616 | case CAN_STATE_ERROR_PASSIVE: |
| 617 | /* error passive state */ |
| 618 | cf->can_id |= CAN_ERR_CRTL; |
| 619 | ecr = m_can_read(priv, M_CAN_ECR); |
| 620 | if (ecr & ECR_RP) |
| 621 | cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; |
| 622 | if (bec.txerr > 127) |
| 623 | cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; |
| 624 | cf->data[6] = bec.txerr; |
| 625 | cf->data[7] = bec.rxerr; |
| 626 | break; |
| 627 | case CAN_STATE_BUS_OFF: |
| 628 | /* bus-off state */ |
| 629 | cf->can_id |= CAN_ERR_BUSOFF; |
| 630 | break; |
| 631 | default: |
| 632 | break; |
| 633 | } |
| 634 | |
| 635 | stats->rx_packets++; |
| 636 | stats->rx_bytes += cf->can_dlc; |
| 637 | netif_receive_skb(skb); |
| 638 | |
| 639 | return 1; |
| 640 | } |
| 641 | |
| 642 | static int m_can_handle_state_errors(struct net_device *dev, u32 psr) |
| 643 | { |
| 644 | struct m_can_priv *priv = netdev_priv(dev); |
| 645 | int work_done = 0; |
| 646 | |
| 647 | if ((psr & PSR_EW) && |
| 648 | (priv->can.state != CAN_STATE_ERROR_WARNING)) { |
| 649 | netdev_dbg(dev, "entered error warning state\n"); |
| 650 | work_done += m_can_handle_state_change(dev, |
| 651 | CAN_STATE_ERROR_WARNING); |
| 652 | } |
| 653 | |
| 654 | if ((psr & PSR_EP) && |
| 655 | (priv->can.state != CAN_STATE_ERROR_PASSIVE)) { |
Dong Aisheng | a93f5ca | 2014-10-29 18:45:22 +0800 | [diff] [blame] | 656 | netdev_dbg(dev, "entered error passive state\n"); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 657 | work_done += m_can_handle_state_change(dev, |
| 658 | CAN_STATE_ERROR_PASSIVE); |
| 659 | } |
| 660 | |
| 661 | if ((psr & PSR_BO) && |
| 662 | (priv->can.state != CAN_STATE_BUS_OFF)) { |
Dong Aisheng | a93f5ca | 2014-10-29 18:45:22 +0800 | [diff] [blame] | 663 | netdev_dbg(dev, "entered error bus off state\n"); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 664 | work_done += m_can_handle_state_change(dev, |
| 665 | CAN_STATE_BUS_OFF); |
| 666 | } |
| 667 | |
| 668 | return work_done; |
| 669 | } |
| 670 | |
| 671 | static void m_can_handle_other_err(struct net_device *dev, u32 irqstatus) |
| 672 | { |
| 673 | if (irqstatus & IR_WDI) |
| 674 | netdev_err(dev, "Message RAM Watchdog event due to missing READY\n"); |
Dong Aisheng | a93f5ca | 2014-10-29 18:45:22 +0800 | [diff] [blame] | 675 | if (irqstatus & IR_ELO) |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 676 | netdev_err(dev, "Error Logging Overflow\n"); |
| 677 | if (irqstatus & IR_BEU) |
| 678 | netdev_err(dev, "Bit Error Uncorrected\n"); |
| 679 | if (irqstatus & IR_BEC) |
| 680 | netdev_err(dev, "Bit Error Corrected\n"); |
| 681 | if (irqstatus & IR_TOO) |
| 682 | netdev_err(dev, "Timeout reached\n"); |
| 683 | if (irqstatus & IR_MRAF) |
| 684 | netdev_err(dev, "Message RAM access failure occurred\n"); |
| 685 | } |
| 686 | |
| 687 | static inline bool is_lec_err(u32 psr) |
| 688 | { |
| 689 | psr &= LEC_UNUSED; |
| 690 | |
| 691 | return psr && (psr != LEC_UNUSED); |
| 692 | } |
| 693 | |
| 694 | static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus, |
| 695 | u32 psr) |
| 696 | { |
| 697 | struct m_can_priv *priv = netdev_priv(dev); |
| 698 | int work_done = 0; |
| 699 | |
| 700 | if (irqstatus & IR_RF0L) |
| 701 | work_done += m_can_handle_lost_msg(dev); |
| 702 | |
| 703 | /* handle lec errors on the bus */ |
| 704 | if ((priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && |
| 705 | is_lec_err(psr)) |
| 706 | work_done += m_can_handle_lec_err(dev, psr & LEC_UNUSED); |
| 707 | |
| 708 | /* other unproccessed error interrupts */ |
| 709 | m_can_handle_other_err(dev, irqstatus); |
| 710 | |
| 711 | return work_done; |
| 712 | } |
| 713 | |
| 714 | static int m_can_poll(struct napi_struct *napi, int quota) |
| 715 | { |
| 716 | struct net_device *dev = napi->dev; |
| 717 | struct m_can_priv *priv = netdev_priv(dev); |
| 718 | int work_done = 0; |
| 719 | u32 irqstatus, psr; |
| 720 | |
| 721 | irqstatus = priv->irqstatus | m_can_read(priv, M_CAN_IR); |
| 722 | if (!irqstatus) |
| 723 | goto end; |
| 724 | |
| 725 | psr = m_can_read(priv, M_CAN_PSR); |
| 726 | if (irqstatus & IR_ERR_STATE) |
| 727 | work_done += m_can_handle_state_errors(dev, psr); |
| 728 | |
| 729 | if (irqstatus & IR_ERR_BUS) |
| 730 | work_done += m_can_handle_bus_errors(dev, irqstatus, psr); |
| 731 | |
| 732 | if (irqstatus & IR_RF0N) |
| 733 | work_done += m_can_do_rx_poll(dev, (quota - work_done)); |
| 734 | |
| 735 | if (work_done < quota) { |
| 736 | napi_complete(napi); |
| 737 | m_can_enable_all_interrupts(priv); |
| 738 | } |
| 739 | |
| 740 | end: |
| 741 | return work_done; |
| 742 | } |
| 743 | |
| 744 | static irqreturn_t m_can_isr(int irq, void *dev_id) |
| 745 | { |
| 746 | struct net_device *dev = (struct net_device *)dev_id; |
| 747 | struct m_can_priv *priv = netdev_priv(dev); |
| 748 | struct net_device_stats *stats = &dev->stats; |
| 749 | u32 ir; |
| 750 | |
| 751 | ir = m_can_read(priv, M_CAN_IR); |
| 752 | if (!ir) |
| 753 | return IRQ_NONE; |
| 754 | |
| 755 | /* ACK all irqs */ |
| 756 | if (ir & IR_ALL_INT) |
| 757 | m_can_write(priv, M_CAN_IR, ir); |
| 758 | |
| 759 | /* schedule NAPI in case of |
| 760 | * - rx IRQ |
| 761 | * - state change IRQ |
| 762 | * - bus error IRQ and bus error reporting |
| 763 | */ |
| 764 | if ((ir & IR_RF0N) || (ir & IR_ERR_ALL)) { |
| 765 | priv->irqstatus = ir; |
| 766 | m_can_disable_all_interrupts(priv); |
| 767 | napi_schedule(&priv->napi); |
| 768 | } |
| 769 | |
| 770 | /* transmission complete interrupt */ |
| 771 | if (ir & IR_TC) { |
| 772 | stats->tx_bytes += can_get_echo_skb(dev, 0); |
| 773 | stats->tx_packets++; |
| 774 | can_led_event(dev, CAN_LED_EVENT_TX); |
| 775 | netif_wake_queue(dev); |
| 776 | } |
| 777 | |
| 778 | return IRQ_HANDLED; |
| 779 | } |
| 780 | |
| 781 | static const struct can_bittiming_const m_can_bittiming_const = { |
| 782 | .name = KBUILD_MODNAME, |
| 783 | .tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */ |
| 784 | .tseg1_max = 64, |
| 785 | .tseg2_min = 1, /* Time segment 2 = phase_seg2 */ |
| 786 | .tseg2_max = 16, |
| 787 | .sjw_max = 16, |
| 788 | .brp_min = 1, |
| 789 | .brp_max = 1024, |
| 790 | .brp_inc = 1, |
| 791 | }; |
| 792 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 793 | static const struct can_bittiming_const m_can_data_bittiming_const = { |
| 794 | .name = KBUILD_MODNAME, |
| 795 | .tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */ |
| 796 | .tseg1_max = 16, |
| 797 | .tseg2_min = 1, /* Time segment 2 = phase_seg2 */ |
| 798 | .tseg2_max = 8, |
| 799 | .sjw_max = 4, |
| 800 | .brp_min = 1, |
| 801 | .brp_max = 32, |
| 802 | .brp_inc = 1, |
| 803 | }; |
| 804 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 805 | static int m_can_set_bittiming(struct net_device *dev) |
| 806 | { |
| 807 | struct m_can_priv *priv = netdev_priv(dev); |
| 808 | const struct can_bittiming *bt = &priv->can.bittiming; |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 809 | const struct can_bittiming *dbt = &priv->can.data_bittiming; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 810 | u16 brp, sjw, tseg1, tseg2; |
| 811 | u32 reg_btp; |
| 812 | |
| 813 | brp = bt->brp - 1; |
| 814 | sjw = bt->sjw - 1; |
| 815 | tseg1 = bt->prop_seg + bt->phase_seg1 - 1; |
| 816 | tseg2 = bt->phase_seg2 - 1; |
| 817 | reg_btp = (brp << BTR_BRP_SHIFT) | (sjw << BTR_SJW_SHIFT) | |
| 818 | (tseg1 << BTR_TSEG1_SHIFT) | (tseg2 << BTR_TSEG2_SHIFT); |
| 819 | m_can_write(priv, M_CAN_BTP, reg_btp); |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 820 | |
| 821 | if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { |
| 822 | brp = dbt->brp - 1; |
| 823 | sjw = dbt->sjw - 1; |
| 824 | tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; |
| 825 | tseg2 = dbt->phase_seg2 - 1; |
| 826 | reg_btp = (brp << FBTR_FBRP_SHIFT) | (sjw << FBTR_FSJW_SHIFT) | |
| 827 | (tseg1 << FBTR_FTSEG1_SHIFT) | |
| 828 | (tseg2 << FBTR_FTSEG2_SHIFT); |
| 829 | m_can_write(priv, M_CAN_FBTP, reg_btp); |
| 830 | } |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 831 | |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | /* Configure M_CAN chip: |
| 836 | * - set rx buffer/fifo element size |
| 837 | * - configure rx fifo |
| 838 | * - accept non-matching frame into fifo 0 |
| 839 | * - configure tx buffer |
| 840 | * - configure mode |
| 841 | * - setup bittiming |
| 842 | */ |
| 843 | static void m_can_chip_config(struct net_device *dev) |
| 844 | { |
| 845 | struct m_can_priv *priv = netdev_priv(dev); |
| 846 | u32 cccr, test; |
| 847 | |
| 848 | m_can_config_endisable(priv, true); |
| 849 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 850 | /* RX Buffer/FIFO Element Size 64 bytes data field */ |
| 851 | m_can_write(priv, M_CAN_RXESC, M_CAN_RXESC_64BYTES); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 852 | |
| 853 | /* Accept Non-matching Frames Into FIFO 0 */ |
| 854 | m_can_write(priv, M_CAN_GFC, 0x0); |
| 855 | |
| 856 | /* only support one Tx Buffer currently */ |
| 857 | m_can_write(priv, M_CAN_TXBC, (1 << TXBC_NDTB_OFF) | |
| 858 | priv->mcfg[MRAM_TXB].off); |
| 859 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 860 | /* support 64 bytes payload */ |
| 861 | m_can_write(priv, M_CAN_TXESC, TXESC_TBDS_64BYTES); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 862 | |
| 863 | m_can_write(priv, M_CAN_TXEFC, (1 << TXEFC_EFS_OFF) | |
| 864 | priv->mcfg[MRAM_TXE].off); |
| 865 | |
| 866 | /* rx fifo configuration, blocking mode, fifo size 1 */ |
| 867 | m_can_write(priv, M_CAN_RXF0C, |
| 868 | (priv->mcfg[MRAM_RXF0].num << RXFC_FS_OFF) | |
| 869 | RXFC_FWM_1 | priv->mcfg[MRAM_RXF0].off); |
| 870 | |
| 871 | m_can_write(priv, M_CAN_RXF1C, |
| 872 | (priv->mcfg[MRAM_RXF1].num << RXFC_FS_OFF) | |
| 873 | RXFC_FWM_1 | priv->mcfg[MRAM_RXF1].off); |
| 874 | |
| 875 | cccr = m_can_read(priv, M_CAN_CCCR); |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 876 | cccr &= ~(CCCR_TEST | CCCR_MON | (CCCR_CMR_MASK << CCCR_CMR_SHIFT) | |
| 877 | (CCCR_CME_MASK << CCCR_CME_SHIFT)); |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 878 | test = m_can_read(priv, M_CAN_TEST); |
| 879 | test &= ~TEST_LBCK; |
| 880 | |
| 881 | if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) |
| 882 | cccr |= CCCR_MON; |
| 883 | |
| 884 | if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) { |
| 885 | cccr |= CCCR_TEST; |
| 886 | test |= TEST_LBCK; |
| 887 | } |
| 888 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 889 | if (priv->can.ctrlmode & CAN_CTRLMODE_FD) |
| 890 | cccr |= CCCR_CME_CANFD_BRS << CCCR_CME_SHIFT; |
| 891 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 892 | m_can_write(priv, M_CAN_CCCR, cccr); |
| 893 | m_can_write(priv, M_CAN_TEST, test); |
| 894 | |
| 895 | /* enable interrupts */ |
| 896 | m_can_write(priv, M_CAN_IR, IR_ALL_INT); |
| 897 | if (!(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) |
| 898 | m_can_write(priv, M_CAN_IE, IR_ALL_INT & ~IR_ERR_LEC); |
| 899 | else |
| 900 | m_can_write(priv, M_CAN_IE, IR_ALL_INT); |
| 901 | |
| 902 | /* route all interrupts to INT0 */ |
| 903 | m_can_write(priv, M_CAN_ILS, ILS_ALL_INT0); |
| 904 | |
| 905 | /* set bittiming params */ |
| 906 | m_can_set_bittiming(dev); |
| 907 | |
| 908 | m_can_config_endisable(priv, false); |
| 909 | } |
| 910 | |
| 911 | static void m_can_start(struct net_device *dev) |
| 912 | { |
| 913 | struct m_can_priv *priv = netdev_priv(dev); |
| 914 | |
| 915 | /* basic m_can configuration */ |
| 916 | m_can_chip_config(dev); |
| 917 | |
| 918 | priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| 919 | |
| 920 | m_can_enable_all_interrupts(priv); |
| 921 | } |
| 922 | |
| 923 | static int m_can_set_mode(struct net_device *dev, enum can_mode mode) |
| 924 | { |
| 925 | switch (mode) { |
| 926 | case CAN_MODE_START: |
| 927 | m_can_start(dev); |
| 928 | netif_wake_queue(dev); |
| 929 | break; |
| 930 | default: |
| 931 | return -EOPNOTSUPP; |
| 932 | } |
| 933 | |
| 934 | return 0; |
| 935 | } |
| 936 | |
| 937 | static void free_m_can_dev(struct net_device *dev) |
| 938 | { |
| 939 | free_candev(dev); |
| 940 | } |
| 941 | |
| 942 | static struct net_device *alloc_m_can_dev(void) |
| 943 | { |
| 944 | struct net_device *dev; |
| 945 | struct m_can_priv *priv; |
| 946 | |
| 947 | dev = alloc_candev(sizeof(*priv), 1); |
| 948 | if (!dev) |
| 949 | return NULL; |
| 950 | |
| 951 | priv = netdev_priv(dev); |
| 952 | netif_napi_add(dev, &priv->napi, m_can_poll, M_CAN_NAPI_WEIGHT); |
| 953 | |
| 954 | priv->dev = dev; |
| 955 | priv->can.bittiming_const = &m_can_bittiming_const; |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 956 | priv->can.data_bittiming_const = &m_can_data_bittiming_const; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 957 | priv->can.do_set_mode = m_can_set_mode; |
| 958 | priv->can.do_get_berr_counter = m_can_get_berr_counter; |
Oliver Hartkopp | 6cfda7f | 2015-01-05 19:47:43 +0100 | [diff] [blame] | 959 | |
| 960 | /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.1 */ |
| 961 | priv->can.ctrlmode = CAN_CTRLMODE_FD_NON_ISO; |
| 962 | |
| 963 | /* CAN_CTRLMODE_FD_NON_ISO can not be changed with M_CAN IP v3.0.1 */ |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 964 | priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | |
| 965 | CAN_CTRLMODE_LISTENONLY | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 966 | CAN_CTRLMODE_BERR_REPORTING | |
| 967 | CAN_CTRLMODE_FD; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 968 | |
| 969 | return dev; |
| 970 | } |
| 971 | |
| 972 | static int m_can_open(struct net_device *dev) |
| 973 | { |
| 974 | struct m_can_priv *priv = netdev_priv(dev); |
| 975 | int err; |
| 976 | |
| 977 | err = clk_prepare_enable(priv->hclk); |
| 978 | if (err) |
| 979 | return err; |
| 980 | |
| 981 | err = clk_prepare_enable(priv->cclk); |
| 982 | if (err) |
| 983 | goto exit_disable_hclk; |
| 984 | |
| 985 | /* open the can device */ |
| 986 | err = open_candev(dev); |
| 987 | if (err) { |
| 988 | netdev_err(dev, "failed to open can device\n"); |
| 989 | goto exit_disable_cclk; |
| 990 | } |
| 991 | |
| 992 | /* register interrupt handler */ |
| 993 | err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, |
| 994 | dev); |
| 995 | if (err < 0) { |
| 996 | netdev_err(dev, "failed to request interrupt\n"); |
| 997 | goto exit_irq_fail; |
| 998 | } |
| 999 | |
| 1000 | /* start the m_can controller */ |
| 1001 | m_can_start(dev); |
| 1002 | |
| 1003 | can_led_event(dev, CAN_LED_EVENT_OPEN); |
| 1004 | napi_enable(&priv->napi); |
| 1005 | netif_start_queue(dev); |
| 1006 | |
| 1007 | return 0; |
| 1008 | |
| 1009 | exit_irq_fail: |
| 1010 | close_candev(dev); |
| 1011 | exit_disable_cclk: |
| 1012 | clk_disable_unprepare(priv->cclk); |
| 1013 | exit_disable_hclk: |
| 1014 | clk_disable_unprepare(priv->hclk); |
| 1015 | return err; |
| 1016 | } |
| 1017 | |
| 1018 | static void m_can_stop(struct net_device *dev) |
| 1019 | { |
| 1020 | struct m_can_priv *priv = netdev_priv(dev); |
| 1021 | |
| 1022 | /* disable all interrupts */ |
| 1023 | m_can_disable_all_interrupts(priv); |
| 1024 | |
| 1025 | clk_disable_unprepare(priv->hclk); |
| 1026 | clk_disable_unprepare(priv->cclk); |
| 1027 | |
| 1028 | /* set the state as STOPPED */ |
| 1029 | priv->can.state = CAN_STATE_STOPPED; |
| 1030 | } |
| 1031 | |
| 1032 | static int m_can_close(struct net_device *dev) |
| 1033 | { |
| 1034 | struct m_can_priv *priv = netdev_priv(dev); |
| 1035 | |
| 1036 | netif_stop_queue(dev); |
| 1037 | napi_disable(&priv->napi); |
| 1038 | m_can_stop(dev); |
| 1039 | free_irq(dev->irq, dev); |
| 1040 | close_candev(dev); |
| 1041 | can_led_event(dev, CAN_LED_EVENT_STOP); |
| 1042 | |
| 1043 | return 0; |
| 1044 | } |
| 1045 | |
| 1046 | static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, |
| 1047 | struct net_device *dev) |
| 1048 | { |
| 1049 | struct m_can_priv *priv = netdev_priv(dev); |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 1050 | struct canfd_frame *cf = (struct canfd_frame *)skb->data; |
| 1051 | u32 id, cccr; |
| 1052 | int i; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1053 | |
| 1054 | if (can_dropped_invalid_skb(dev, skb)) |
| 1055 | return NETDEV_TX_OK; |
| 1056 | |
| 1057 | netif_stop_queue(dev); |
| 1058 | |
| 1059 | if (cf->can_id & CAN_EFF_FLAG) { |
| 1060 | id = cf->can_id & CAN_EFF_MASK; |
| 1061 | id |= TX_BUF_XTD; |
| 1062 | } else { |
| 1063 | id = ((cf->can_id & CAN_SFF_MASK) << 18); |
| 1064 | } |
| 1065 | |
| 1066 | if (cf->can_id & CAN_RTR_FLAG) |
| 1067 | id |= TX_BUF_RTR; |
| 1068 | |
| 1069 | /* message ram configuration */ |
| 1070 | m_can_fifo_write(priv, 0, M_CAN_FIFO_ID, id); |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 1071 | m_can_fifo_write(priv, 0, M_CAN_FIFO_DLC, can_len2dlc(cf->len) << 16); |
| 1072 | |
| 1073 | for (i = 0; i < cf->len; i += 4) |
| 1074 | m_can_fifo_write(priv, 0, M_CAN_FIFO_DATA(i / 4), |
| 1075 | *(u32 *)(cf->data + i)); |
| 1076 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1077 | can_put_echo_skb(skb, dev, 0); |
| 1078 | |
Dong Aisheng | 8064673 | 2014-11-18 19:00:55 +0800 | [diff] [blame] | 1079 | if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { |
| 1080 | cccr = m_can_read(priv, M_CAN_CCCR); |
| 1081 | cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT); |
| 1082 | if (can_is_canfd_skb(skb)) { |
| 1083 | if (cf->flags & CANFD_BRS) |
| 1084 | cccr |= CCCR_CMR_CANFD_BRS << CCCR_CMR_SHIFT; |
| 1085 | else |
| 1086 | cccr |= CCCR_CMR_CANFD << CCCR_CMR_SHIFT; |
| 1087 | } else { |
| 1088 | cccr |= CCCR_CMR_CAN << CCCR_CMR_SHIFT; |
| 1089 | } |
| 1090 | m_can_write(priv, M_CAN_CCCR, cccr); |
| 1091 | } |
| 1092 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1093 | /* enable first TX buffer to start transfer */ |
| 1094 | m_can_write(priv, M_CAN_TXBTIE, 0x1); |
| 1095 | m_can_write(priv, M_CAN_TXBAR, 0x1); |
| 1096 | |
| 1097 | return NETDEV_TX_OK; |
| 1098 | } |
| 1099 | |
| 1100 | static const struct net_device_ops m_can_netdev_ops = { |
| 1101 | .ndo_open = m_can_open, |
| 1102 | .ndo_stop = m_can_close, |
| 1103 | .ndo_start_xmit = m_can_start_xmit, |
Dong Aisheng | d6fdb38 | 2014-10-29 18:45:23 +0800 | [diff] [blame] | 1104 | .ndo_change_mtu = can_change_mtu, |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1105 | }; |
| 1106 | |
| 1107 | static int register_m_can_dev(struct net_device *dev) |
| 1108 | { |
| 1109 | dev->flags |= IFF_ECHO; /* we support local echo */ |
| 1110 | dev->netdev_ops = &m_can_netdev_ops; |
| 1111 | |
| 1112 | return register_candev(dev); |
| 1113 | } |
| 1114 | |
| 1115 | static int m_can_of_parse_mram(struct platform_device *pdev, |
| 1116 | struct m_can_priv *priv) |
| 1117 | { |
| 1118 | struct device_node *np = pdev->dev.of_node; |
| 1119 | struct resource *res; |
| 1120 | void __iomem *addr; |
| 1121 | u32 out_val[MRAM_CFG_LEN]; |
Dong Aisheng | 962845d | 2014-11-07 16:45:14 +0800 | [diff] [blame] | 1122 | int i, start, end, ret; |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1123 | |
| 1124 | /* message ram could be shared */ |
| 1125 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); |
| 1126 | if (!res) |
| 1127 | return -ENODEV; |
| 1128 | |
| 1129 | addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
| 1130 | if (!addr) |
| 1131 | return -ENOMEM; |
| 1132 | |
| 1133 | /* get message ram configuration */ |
| 1134 | ret = of_property_read_u32_array(np, "bosch,mram-cfg", |
| 1135 | out_val, sizeof(out_val) / 4); |
| 1136 | if (ret) { |
| 1137 | dev_err(&pdev->dev, "can not get message ram configuration\n"); |
| 1138 | return -ENODEV; |
| 1139 | } |
| 1140 | |
| 1141 | priv->mram_base = addr; |
| 1142 | priv->mcfg[MRAM_SIDF].off = out_val[0]; |
| 1143 | priv->mcfg[MRAM_SIDF].num = out_val[1]; |
| 1144 | priv->mcfg[MRAM_XIDF].off = priv->mcfg[MRAM_SIDF].off + |
| 1145 | priv->mcfg[MRAM_SIDF].num * SIDF_ELEMENT_SIZE; |
| 1146 | priv->mcfg[MRAM_XIDF].num = out_val[2]; |
| 1147 | priv->mcfg[MRAM_RXF0].off = priv->mcfg[MRAM_XIDF].off + |
| 1148 | priv->mcfg[MRAM_XIDF].num * XIDF_ELEMENT_SIZE; |
| 1149 | priv->mcfg[MRAM_RXF0].num = out_val[3] & RXFC_FS_MASK; |
| 1150 | priv->mcfg[MRAM_RXF1].off = priv->mcfg[MRAM_RXF0].off + |
| 1151 | priv->mcfg[MRAM_RXF0].num * RXF0_ELEMENT_SIZE; |
| 1152 | priv->mcfg[MRAM_RXF1].num = out_val[4] & RXFC_FS_MASK; |
| 1153 | priv->mcfg[MRAM_RXB].off = priv->mcfg[MRAM_RXF1].off + |
| 1154 | priv->mcfg[MRAM_RXF1].num * RXF1_ELEMENT_SIZE; |
| 1155 | priv->mcfg[MRAM_RXB].num = out_val[5]; |
| 1156 | priv->mcfg[MRAM_TXE].off = priv->mcfg[MRAM_RXB].off + |
| 1157 | priv->mcfg[MRAM_RXB].num * RXB_ELEMENT_SIZE; |
| 1158 | priv->mcfg[MRAM_TXE].num = out_val[6]; |
| 1159 | priv->mcfg[MRAM_TXB].off = priv->mcfg[MRAM_TXE].off + |
| 1160 | priv->mcfg[MRAM_TXE].num * TXE_ELEMENT_SIZE; |
| 1161 | priv->mcfg[MRAM_TXB].num = out_val[7] & TXBC_NDTB_MASK; |
| 1162 | |
| 1163 | dev_dbg(&pdev->dev, "mram_base %p sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n", |
| 1164 | priv->mram_base, |
| 1165 | priv->mcfg[MRAM_SIDF].off, priv->mcfg[MRAM_SIDF].num, |
| 1166 | priv->mcfg[MRAM_XIDF].off, priv->mcfg[MRAM_XIDF].num, |
| 1167 | priv->mcfg[MRAM_RXF0].off, priv->mcfg[MRAM_RXF0].num, |
| 1168 | priv->mcfg[MRAM_RXF1].off, priv->mcfg[MRAM_RXF1].num, |
| 1169 | priv->mcfg[MRAM_RXB].off, priv->mcfg[MRAM_RXB].num, |
| 1170 | priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num, |
| 1171 | priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num); |
| 1172 | |
Dong Aisheng | 962845d | 2014-11-07 16:45:14 +0800 | [diff] [blame] | 1173 | /* initialize the entire Message RAM in use to avoid possible |
| 1174 | * ECC/parity checksum errors when reading an uninitialized buffer |
| 1175 | */ |
| 1176 | start = priv->mcfg[MRAM_SIDF].off; |
| 1177 | end = priv->mcfg[MRAM_TXB].off + |
| 1178 | priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE; |
| 1179 | for (i = start; i < end; i += 4) |
| 1180 | writel(0x0, priv->mram_base + i); |
| 1181 | |
Dong Aisheng | e0d1f48 | 2014-07-16 17:30:50 +0800 | [diff] [blame] | 1182 | return 0; |
| 1183 | } |
| 1184 | |
| 1185 | static int m_can_plat_probe(struct platform_device *pdev) |
| 1186 | { |
| 1187 | struct net_device *dev; |
| 1188 | struct m_can_priv *priv; |
| 1189 | struct resource *res; |
| 1190 | void __iomem *addr; |
| 1191 | struct clk *hclk, *cclk; |
| 1192 | int irq, ret; |
| 1193 | |
| 1194 | hclk = devm_clk_get(&pdev->dev, "hclk"); |
| 1195 | cclk = devm_clk_get(&pdev->dev, "cclk"); |
| 1196 | if (IS_ERR(hclk) || IS_ERR(cclk)) { |
| 1197 | dev_err(&pdev->dev, "no clock find\n"); |
| 1198 | return -ENODEV; |
| 1199 | } |
| 1200 | |
| 1201 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); |
| 1202 | addr = devm_ioremap_resource(&pdev->dev, res); |
| 1203 | irq = platform_get_irq_byname(pdev, "int0"); |
| 1204 | if (IS_ERR(addr) || irq < 0) |
| 1205 | return -EINVAL; |
| 1206 | |
| 1207 | /* allocate the m_can device */ |
| 1208 | dev = alloc_m_can_dev(); |
| 1209 | if (!dev) |
| 1210 | return -ENOMEM; |
| 1211 | |
| 1212 | priv = netdev_priv(dev); |
| 1213 | dev->irq = irq; |
| 1214 | priv->base = addr; |
| 1215 | priv->device = &pdev->dev; |
| 1216 | priv->hclk = hclk; |
| 1217 | priv->cclk = cclk; |
| 1218 | priv->can.clock.freq = clk_get_rate(cclk); |
| 1219 | |
| 1220 | ret = m_can_of_parse_mram(pdev, priv); |
| 1221 | if (ret) |
| 1222 | goto failed_free_dev; |
| 1223 | |
| 1224 | platform_set_drvdata(pdev, dev); |
| 1225 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 1226 | |
| 1227 | ret = register_m_can_dev(dev); |
| 1228 | if (ret) { |
| 1229 | dev_err(&pdev->dev, "registering %s failed (err=%d)\n", |
| 1230 | KBUILD_MODNAME, ret); |
| 1231 | goto failed_free_dev; |
| 1232 | } |
| 1233 | |
| 1234 | devm_can_led_init(dev); |
| 1235 | |
| 1236 | dev_info(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n", |
| 1237 | KBUILD_MODNAME, priv->base, dev->irq); |
| 1238 | |
| 1239 | return 0; |
| 1240 | |
| 1241 | failed_free_dev: |
| 1242 | free_m_can_dev(dev); |
| 1243 | return ret; |
| 1244 | } |
| 1245 | |
| 1246 | static __maybe_unused int m_can_suspend(struct device *dev) |
| 1247 | { |
| 1248 | struct net_device *ndev = dev_get_drvdata(dev); |
| 1249 | struct m_can_priv *priv = netdev_priv(ndev); |
| 1250 | |
| 1251 | if (netif_running(ndev)) { |
| 1252 | netif_stop_queue(ndev); |
| 1253 | netif_device_detach(ndev); |
| 1254 | } |
| 1255 | |
| 1256 | /* TODO: enter low power */ |
| 1257 | |
| 1258 | priv->can.state = CAN_STATE_SLEEPING; |
| 1259 | |
| 1260 | return 0; |
| 1261 | } |
| 1262 | |
| 1263 | static __maybe_unused int m_can_resume(struct device *dev) |
| 1264 | { |
| 1265 | struct net_device *ndev = dev_get_drvdata(dev); |
| 1266 | struct m_can_priv *priv = netdev_priv(ndev); |
| 1267 | |
| 1268 | /* TODO: exit low power */ |
| 1269 | |
| 1270 | priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| 1271 | |
| 1272 | if (netif_running(ndev)) { |
| 1273 | netif_device_attach(ndev); |
| 1274 | netif_start_queue(ndev); |
| 1275 | } |
| 1276 | |
| 1277 | return 0; |
| 1278 | } |
| 1279 | |
| 1280 | static void unregister_m_can_dev(struct net_device *dev) |
| 1281 | { |
| 1282 | unregister_candev(dev); |
| 1283 | } |
| 1284 | |
| 1285 | static int m_can_plat_remove(struct platform_device *pdev) |
| 1286 | { |
| 1287 | struct net_device *dev = platform_get_drvdata(pdev); |
| 1288 | |
| 1289 | unregister_m_can_dev(dev); |
| 1290 | platform_set_drvdata(pdev, NULL); |
| 1291 | |
| 1292 | free_m_can_dev(dev); |
| 1293 | |
| 1294 | return 0; |
| 1295 | } |
| 1296 | |
| 1297 | static const struct dev_pm_ops m_can_pmops = { |
| 1298 | SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) |
| 1299 | }; |
| 1300 | |
| 1301 | static const struct of_device_id m_can_of_table[] = { |
| 1302 | { .compatible = "bosch,m_can", .data = NULL }, |
| 1303 | { /* sentinel */ }, |
| 1304 | }; |
| 1305 | MODULE_DEVICE_TABLE(of, m_can_of_table); |
| 1306 | |
| 1307 | static struct platform_driver m_can_plat_driver = { |
| 1308 | .driver = { |
| 1309 | .name = KBUILD_MODNAME, |
| 1310 | .of_match_table = m_can_of_table, |
| 1311 | .pm = &m_can_pmops, |
| 1312 | }, |
| 1313 | .probe = m_can_plat_probe, |
| 1314 | .remove = m_can_plat_remove, |
| 1315 | }; |
| 1316 | |
| 1317 | module_platform_driver(m_can_plat_driver); |
| 1318 | |
| 1319 | MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); |
| 1320 | MODULE_LICENSE("GPL v2"); |
| 1321 | MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller"); |