Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1 | /* |
| 2 | * flexcan.c - FLEXCAN CAN controller driver |
| 3 | * |
| 4 | * Copyright (c) 2005-2006 Varma Electronics Oy |
| 5 | * Copyright (c) 2009 Sascha Hauer, Pengutronix |
| 6 | * Copyright (c) 2010 Marc Kleine-Budde, Pengutronix |
| 7 | * |
| 8 | * Based on code originally by Andrey Volkov <avolkov@varma-el.com> |
| 9 | * |
| 10 | * LICENCE: |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation version 2. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/can.h> |
| 24 | #include <linux/can/dev.h> |
| 25 | #include <linux/can/error.h> |
| 26 | #include <linux/can/platform/flexcan.h> |
| 27 | #include <linux/clk.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/if_arp.h> |
| 30 | #include <linux/if_ether.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/io.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/list.h> |
| 35 | #include <linux/module.h> |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 36 | #include <linux/of.h> |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 37 | #include <linux/platform_device.h> |
| 38 | |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 39 | #define DRV_NAME "flexcan" |
| 40 | |
| 41 | /* 8 for RX fifo and 2 error handling */ |
| 42 | #define FLEXCAN_NAPI_WEIGHT (8 + 2) |
| 43 | |
| 44 | /* FLEXCAN module configuration register (CANMCR) bits */ |
| 45 | #define FLEXCAN_MCR_MDIS BIT(31) |
| 46 | #define FLEXCAN_MCR_FRZ BIT(30) |
| 47 | #define FLEXCAN_MCR_FEN BIT(29) |
| 48 | #define FLEXCAN_MCR_HALT BIT(28) |
| 49 | #define FLEXCAN_MCR_NOT_RDY BIT(27) |
| 50 | #define FLEXCAN_MCR_WAK_MSK BIT(26) |
| 51 | #define FLEXCAN_MCR_SOFTRST BIT(25) |
| 52 | #define FLEXCAN_MCR_FRZ_ACK BIT(24) |
| 53 | #define FLEXCAN_MCR_SUPV BIT(23) |
| 54 | #define FLEXCAN_MCR_SLF_WAK BIT(22) |
| 55 | #define FLEXCAN_MCR_WRN_EN BIT(21) |
| 56 | #define FLEXCAN_MCR_LPM_ACK BIT(20) |
| 57 | #define FLEXCAN_MCR_WAK_SRC BIT(19) |
| 58 | #define FLEXCAN_MCR_DOZE BIT(18) |
| 59 | #define FLEXCAN_MCR_SRX_DIS BIT(17) |
| 60 | #define FLEXCAN_MCR_BCC BIT(16) |
| 61 | #define FLEXCAN_MCR_LPRIO_EN BIT(13) |
| 62 | #define FLEXCAN_MCR_AEN BIT(12) |
| 63 | #define FLEXCAN_MCR_MAXMB(x) ((x) & 0xf) |
| 64 | #define FLEXCAN_MCR_IDAM_A (0 << 8) |
| 65 | #define FLEXCAN_MCR_IDAM_B (1 << 8) |
| 66 | #define FLEXCAN_MCR_IDAM_C (2 << 8) |
| 67 | #define FLEXCAN_MCR_IDAM_D (3 << 8) |
| 68 | |
| 69 | /* FLEXCAN control register (CANCTRL) bits */ |
| 70 | #define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) |
| 71 | #define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) |
| 72 | #define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) |
| 73 | #define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) |
| 74 | #define FLEXCAN_CTRL_BOFF_MSK BIT(15) |
| 75 | #define FLEXCAN_CTRL_ERR_MSK BIT(14) |
| 76 | #define FLEXCAN_CTRL_CLK_SRC BIT(13) |
| 77 | #define FLEXCAN_CTRL_LPB BIT(12) |
| 78 | #define FLEXCAN_CTRL_TWRN_MSK BIT(11) |
| 79 | #define FLEXCAN_CTRL_RWRN_MSK BIT(10) |
| 80 | #define FLEXCAN_CTRL_SMP BIT(7) |
| 81 | #define FLEXCAN_CTRL_BOFF_REC BIT(6) |
| 82 | #define FLEXCAN_CTRL_TSYN BIT(5) |
| 83 | #define FLEXCAN_CTRL_LBUF BIT(4) |
| 84 | #define FLEXCAN_CTRL_LOM BIT(3) |
| 85 | #define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) |
| 86 | #define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) |
| 87 | #define FLEXCAN_CTRL_ERR_STATE \ |
| 88 | (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ |
| 89 | FLEXCAN_CTRL_BOFF_MSK) |
| 90 | #define FLEXCAN_CTRL_ERR_ALL \ |
| 91 | (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) |
| 92 | |
| 93 | /* FLEXCAN error and status register (ESR) bits */ |
| 94 | #define FLEXCAN_ESR_TWRN_INT BIT(17) |
| 95 | #define FLEXCAN_ESR_RWRN_INT BIT(16) |
| 96 | #define FLEXCAN_ESR_BIT1_ERR BIT(15) |
| 97 | #define FLEXCAN_ESR_BIT0_ERR BIT(14) |
| 98 | #define FLEXCAN_ESR_ACK_ERR BIT(13) |
| 99 | #define FLEXCAN_ESR_CRC_ERR BIT(12) |
| 100 | #define FLEXCAN_ESR_FRM_ERR BIT(11) |
| 101 | #define FLEXCAN_ESR_STF_ERR BIT(10) |
| 102 | #define FLEXCAN_ESR_TX_WRN BIT(9) |
| 103 | #define FLEXCAN_ESR_RX_WRN BIT(8) |
| 104 | #define FLEXCAN_ESR_IDLE BIT(7) |
| 105 | #define FLEXCAN_ESR_TXRX BIT(6) |
| 106 | #define FLEXCAN_EST_FLT_CONF_SHIFT (4) |
| 107 | #define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) |
| 108 | #define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) |
| 109 | #define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) |
| 110 | #define FLEXCAN_ESR_BOFF_INT BIT(2) |
| 111 | #define FLEXCAN_ESR_ERR_INT BIT(1) |
| 112 | #define FLEXCAN_ESR_WAK_INT BIT(0) |
| 113 | #define FLEXCAN_ESR_ERR_BUS \ |
| 114 | (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ |
| 115 | FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ |
| 116 | FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) |
| 117 | #define FLEXCAN_ESR_ERR_STATE \ |
| 118 | (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) |
| 119 | #define FLEXCAN_ESR_ERR_ALL \ |
| 120 | (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) |
Wolfgang Grandegger | 6e9d554 | 2011-12-12 16:09:28 +0100 | [diff] [blame] | 121 | #define FLEXCAN_ESR_ALL_INT \ |
| 122 | (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \ |
| 123 | FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT) |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 124 | |
| 125 | /* FLEXCAN interrupt flag register (IFLAG) bits */ |
| 126 | #define FLEXCAN_TX_BUF_ID 8 |
| 127 | #define FLEXCAN_IFLAG_BUF(x) BIT(x) |
| 128 | #define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) |
| 129 | #define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) |
| 130 | #define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) |
| 131 | #define FLEXCAN_IFLAG_DEFAULT \ |
| 132 | (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ |
| 133 | FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) |
| 134 | |
| 135 | /* FLEXCAN message buffers */ |
| 136 | #define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) |
| 137 | #define FLEXCAN_MB_CNT_SRR BIT(22) |
| 138 | #define FLEXCAN_MB_CNT_IDE BIT(21) |
| 139 | #define FLEXCAN_MB_CNT_RTR BIT(20) |
| 140 | #define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) |
| 141 | #define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) |
| 142 | |
| 143 | #define FLEXCAN_MB_CODE_MASK (0xf0ffffff) |
| 144 | |
| 145 | /* Structure of the message buffer */ |
| 146 | struct flexcan_mb { |
| 147 | u32 can_ctrl; |
| 148 | u32 can_id; |
| 149 | u32 data[2]; |
| 150 | }; |
| 151 | |
| 152 | /* Structure of the hardware registers */ |
| 153 | struct flexcan_regs { |
| 154 | u32 mcr; /* 0x00 */ |
| 155 | u32 ctrl; /* 0x04 */ |
| 156 | u32 timer; /* 0x08 */ |
| 157 | u32 _reserved1; /* 0x0c */ |
| 158 | u32 rxgmask; /* 0x10 */ |
| 159 | u32 rx14mask; /* 0x14 */ |
| 160 | u32 rx15mask; /* 0x18 */ |
| 161 | u32 ecr; /* 0x1c */ |
| 162 | u32 esr; /* 0x20 */ |
| 163 | u32 imask2; /* 0x24 */ |
| 164 | u32 imask1; /* 0x28 */ |
| 165 | u32 iflag2; /* 0x2c */ |
| 166 | u32 iflag1; /* 0x30 */ |
| 167 | u32 _reserved2[19]; |
| 168 | struct flexcan_mb cantxfg[64]; |
| 169 | }; |
| 170 | |
| 171 | struct flexcan_priv { |
| 172 | struct can_priv can; |
| 173 | struct net_device *dev; |
| 174 | struct napi_struct napi; |
| 175 | |
| 176 | void __iomem *base; |
| 177 | u32 reg_esr; |
| 178 | u32 reg_ctrl_default; |
| 179 | |
| 180 | struct clk *clk; |
| 181 | struct flexcan_platform_data *pdata; |
| 182 | }; |
| 183 | |
| 184 | static struct can_bittiming_const flexcan_bittiming_const = { |
| 185 | .name = DRV_NAME, |
| 186 | .tseg1_min = 4, |
| 187 | .tseg1_max = 16, |
| 188 | .tseg2_min = 2, |
| 189 | .tseg2_max = 8, |
| 190 | .sjw_max = 4, |
| 191 | .brp_min = 1, |
| 192 | .brp_max = 256, |
| 193 | .brp_inc = 1, |
| 194 | }; |
| 195 | |
| 196 | /* |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 197 | * Abstract off the read/write for arm versus ppc. |
| 198 | */ |
| 199 | #if defined(__BIG_ENDIAN) |
| 200 | static inline u32 flexcan_read(void __iomem *addr) |
| 201 | { |
| 202 | return in_be32(addr); |
| 203 | } |
| 204 | |
| 205 | static inline void flexcan_write(u32 val, void __iomem *addr) |
| 206 | { |
| 207 | out_be32(addr, val); |
| 208 | } |
| 209 | #else |
| 210 | static inline u32 flexcan_read(void __iomem *addr) |
| 211 | { |
| 212 | return readl(addr); |
| 213 | } |
| 214 | |
| 215 | static inline void flexcan_write(u32 val, void __iomem *addr) |
| 216 | { |
| 217 | writel(val, addr); |
| 218 | } |
| 219 | #endif |
| 220 | |
| 221 | /* |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 222 | * Swtich transceiver on or off |
| 223 | */ |
| 224 | static void flexcan_transceiver_switch(const struct flexcan_priv *priv, int on) |
| 225 | { |
| 226 | if (priv->pdata && priv->pdata->transceiver_switch) |
| 227 | priv->pdata->transceiver_switch(on); |
| 228 | } |
| 229 | |
| 230 | static inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, |
| 231 | u32 reg_esr) |
| 232 | { |
| 233 | return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && |
| 234 | (reg_esr & FLEXCAN_ESR_ERR_BUS); |
| 235 | } |
| 236 | |
| 237 | static inline void flexcan_chip_enable(struct flexcan_priv *priv) |
| 238 | { |
| 239 | struct flexcan_regs __iomem *regs = priv->base; |
| 240 | u32 reg; |
| 241 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 242 | reg = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 243 | reg &= ~FLEXCAN_MCR_MDIS; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 244 | flexcan_write(reg, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 245 | |
| 246 | udelay(10); |
| 247 | } |
| 248 | |
| 249 | static inline void flexcan_chip_disable(struct flexcan_priv *priv) |
| 250 | { |
| 251 | struct flexcan_regs __iomem *regs = priv->base; |
| 252 | u32 reg; |
| 253 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 254 | reg = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 255 | reg |= FLEXCAN_MCR_MDIS; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 256 | flexcan_write(reg, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | static int flexcan_get_berr_counter(const struct net_device *dev, |
| 260 | struct can_berr_counter *bec) |
| 261 | { |
| 262 | const struct flexcan_priv *priv = netdev_priv(dev); |
| 263 | struct flexcan_regs __iomem *regs = priv->base; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 264 | u32 reg = flexcan_read(®s->ecr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 265 | |
| 266 | bec->txerr = (reg >> 0) & 0xff; |
| 267 | bec->rxerr = (reg >> 8) & 0xff; |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 273 | { |
| 274 | const struct flexcan_priv *priv = netdev_priv(dev); |
| 275 | struct net_device_stats *stats = &dev->stats; |
| 276 | struct flexcan_regs __iomem *regs = priv->base; |
| 277 | struct can_frame *cf = (struct can_frame *)skb->data; |
| 278 | u32 can_id; |
| 279 | u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); |
| 280 | |
| 281 | if (can_dropped_invalid_skb(dev, skb)) |
| 282 | return NETDEV_TX_OK; |
| 283 | |
| 284 | netif_stop_queue(dev); |
| 285 | |
| 286 | if (cf->can_id & CAN_EFF_FLAG) { |
| 287 | can_id = cf->can_id & CAN_EFF_MASK; |
| 288 | ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; |
| 289 | } else { |
| 290 | can_id = (cf->can_id & CAN_SFF_MASK) << 18; |
| 291 | } |
| 292 | |
| 293 | if (cf->can_id & CAN_RTR_FLAG) |
| 294 | ctrl |= FLEXCAN_MB_CNT_RTR; |
| 295 | |
| 296 | if (cf->can_dlc > 0) { |
| 297 | u32 data = be32_to_cpup((__be32 *)&cf->data[0]); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 298 | flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 299 | } |
| 300 | if (cf->can_dlc > 3) { |
| 301 | u32 data = be32_to_cpup((__be32 *)&cf->data[4]); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 302 | flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 303 | } |
| 304 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 305 | flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); |
| 306 | flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 307 | |
| 308 | kfree_skb(skb); |
| 309 | |
| 310 | /* tx_packets is incremented in flexcan_irq */ |
| 311 | stats->tx_bytes += cf->can_dlc; |
| 312 | |
| 313 | return NETDEV_TX_OK; |
| 314 | } |
| 315 | |
| 316 | static void do_bus_err(struct net_device *dev, |
| 317 | struct can_frame *cf, u32 reg_esr) |
| 318 | { |
| 319 | struct flexcan_priv *priv = netdev_priv(dev); |
| 320 | int rx_errors = 0, tx_errors = 0; |
| 321 | |
| 322 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
| 323 | |
| 324 | if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { |
| 325 | dev_dbg(dev->dev.parent, "BIT1_ERR irq\n"); |
| 326 | cf->data[2] |= CAN_ERR_PROT_BIT1; |
| 327 | tx_errors = 1; |
| 328 | } |
| 329 | if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { |
| 330 | dev_dbg(dev->dev.parent, "BIT0_ERR irq\n"); |
| 331 | cf->data[2] |= CAN_ERR_PROT_BIT0; |
| 332 | tx_errors = 1; |
| 333 | } |
| 334 | if (reg_esr & FLEXCAN_ESR_ACK_ERR) { |
| 335 | dev_dbg(dev->dev.parent, "ACK_ERR irq\n"); |
| 336 | cf->can_id |= CAN_ERR_ACK; |
| 337 | cf->data[3] |= CAN_ERR_PROT_LOC_ACK; |
| 338 | tx_errors = 1; |
| 339 | } |
| 340 | if (reg_esr & FLEXCAN_ESR_CRC_ERR) { |
| 341 | dev_dbg(dev->dev.parent, "CRC_ERR irq\n"); |
| 342 | cf->data[2] |= CAN_ERR_PROT_BIT; |
| 343 | cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; |
| 344 | rx_errors = 1; |
| 345 | } |
| 346 | if (reg_esr & FLEXCAN_ESR_FRM_ERR) { |
| 347 | dev_dbg(dev->dev.parent, "FRM_ERR irq\n"); |
| 348 | cf->data[2] |= CAN_ERR_PROT_FORM; |
| 349 | rx_errors = 1; |
| 350 | } |
| 351 | if (reg_esr & FLEXCAN_ESR_STF_ERR) { |
| 352 | dev_dbg(dev->dev.parent, "STF_ERR irq\n"); |
| 353 | cf->data[2] |= CAN_ERR_PROT_STUFF; |
| 354 | rx_errors = 1; |
| 355 | } |
| 356 | |
| 357 | priv->can.can_stats.bus_error++; |
| 358 | if (rx_errors) |
| 359 | dev->stats.rx_errors++; |
| 360 | if (tx_errors) |
| 361 | dev->stats.tx_errors++; |
| 362 | } |
| 363 | |
| 364 | static int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) |
| 365 | { |
| 366 | struct sk_buff *skb; |
| 367 | struct can_frame *cf; |
| 368 | |
| 369 | skb = alloc_can_err_skb(dev, &cf); |
| 370 | if (unlikely(!skb)) |
| 371 | return 0; |
| 372 | |
| 373 | do_bus_err(dev, cf, reg_esr); |
| 374 | netif_receive_skb(skb); |
| 375 | |
| 376 | dev->stats.rx_packets++; |
| 377 | dev->stats.rx_bytes += cf->can_dlc; |
| 378 | |
| 379 | return 1; |
| 380 | } |
| 381 | |
| 382 | static void do_state(struct net_device *dev, |
| 383 | struct can_frame *cf, enum can_state new_state) |
| 384 | { |
| 385 | struct flexcan_priv *priv = netdev_priv(dev); |
| 386 | struct can_berr_counter bec; |
| 387 | |
| 388 | flexcan_get_berr_counter(dev, &bec); |
| 389 | |
| 390 | switch (priv->can.state) { |
| 391 | case CAN_STATE_ERROR_ACTIVE: |
| 392 | /* |
| 393 | * from: ERROR_ACTIVE |
| 394 | * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF |
| 395 | * => : there was a warning int |
| 396 | */ |
| 397 | if (new_state >= CAN_STATE_ERROR_WARNING && |
| 398 | new_state <= CAN_STATE_BUS_OFF) { |
| 399 | dev_dbg(dev->dev.parent, "Error Warning IRQ\n"); |
| 400 | priv->can.can_stats.error_warning++; |
| 401 | |
| 402 | cf->can_id |= CAN_ERR_CRTL; |
| 403 | cf->data[1] = (bec.txerr > bec.rxerr) ? |
| 404 | CAN_ERR_CRTL_TX_WARNING : |
| 405 | CAN_ERR_CRTL_RX_WARNING; |
| 406 | } |
| 407 | case CAN_STATE_ERROR_WARNING: /* fallthrough */ |
| 408 | /* |
| 409 | * from: ERROR_ACTIVE, ERROR_WARNING |
| 410 | * to : ERROR_PASSIVE, BUS_OFF |
| 411 | * => : error passive int |
| 412 | */ |
| 413 | if (new_state >= CAN_STATE_ERROR_PASSIVE && |
| 414 | new_state <= CAN_STATE_BUS_OFF) { |
| 415 | dev_dbg(dev->dev.parent, "Error Passive IRQ\n"); |
| 416 | priv->can.can_stats.error_passive++; |
| 417 | |
| 418 | cf->can_id |= CAN_ERR_CRTL; |
| 419 | cf->data[1] = (bec.txerr > bec.rxerr) ? |
| 420 | CAN_ERR_CRTL_TX_PASSIVE : |
| 421 | CAN_ERR_CRTL_RX_PASSIVE; |
| 422 | } |
| 423 | break; |
| 424 | case CAN_STATE_BUS_OFF: |
| 425 | dev_err(dev->dev.parent, |
| 426 | "BUG! hardware recovered automatically from BUS_OFF\n"); |
| 427 | break; |
| 428 | default: |
| 429 | break; |
| 430 | } |
| 431 | |
| 432 | /* process state changes depending on the new state */ |
| 433 | switch (new_state) { |
| 434 | case CAN_STATE_ERROR_ACTIVE: |
| 435 | dev_dbg(dev->dev.parent, "Error Active\n"); |
| 436 | cf->can_id |= CAN_ERR_PROT; |
| 437 | cf->data[2] = CAN_ERR_PROT_ACTIVE; |
| 438 | break; |
| 439 | case CAN_STATE_BUS_OFF: |
| 440 | cf->can_id |= CAN_ERR_BUSOFF; |
| 441 | can_bus_off(dev); |
| 442 | break; |
| 443 | default: |
| 444 | break; |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | static int flexcan_poll_state(struct net_device *dev, u32 reg_esr) |
| 449 | { |
| 450 | struct flexcan_priv *priv = netdev_priv(dev); |
| 451 | struct sk_buff *skb; |
| 452 | struct can_frame *cf; |
| 453 | enum can_state new_state; |
| 454 | int flt; |
| 455 | |
| 456 | flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; |
| 457 | if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { |
| 458 | if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | |
| 459 | FLEXCAN_ESR_RX_WRN)))) |
| 460 | new_state = CAN_STATE_ERROR_ACTIVE; |
| 461 | else |
| 462 | new_state = CAN_STATE_ERROR_WARNING; |
| 463 | } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) |
| 464 | new_state = CAN_STATE_ERROR_PASSIVE; |
| 465 | else |
| 466 | new_state = CAN_STATE_BUS_OFF; |
| 467 | |
| 468 | /* state hasn't changed */ |
| 469 | if (likely(new_state == priv->can.state)) |
| 470 | return 0; |
| 471 | |
| 472 | skb = alloc_can_err_skb(dev, &cf); |
| 473 | if (unlikely(!skb)) |
| 474 | return 0; |
| 475 | |
| 476 | do_state(dev, cf, new_state); |
| 477 | priv->can.state = new_state; |
| 478 | netif_receive_skb(skb); |
| 479 | |
| 480 | dev->stats.rx_packets++; |
| 481 | dev->stats.rx_bytes += cf->can_dlc; |
| 482 | |
| 483 | return 1; |
| 484 | } |
| 485 | |
| 486 | static void flexcan_read_fifo(const struct net_device *dev, |
| 487 | struct can_frame *cf) |
| 488 | { |
| 489 | const struct flexcan_priv *priv = netdev_priv(dev); |
| 490 | struct flexcan_regs __iomem *regs = priv->base; |
| 491 | struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; |
| 492 | u32 reg_ctrl, reg_id; |
| 493 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 494 | reg_ctrl = flexcan_read(&mb->can_ctrl); |
| 495 | reg_id = flexcan_read(&mb->can_id); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 496 | if (reg_ctrl & FLEXCAN_MB_CNT_IDE) |
| 497 | cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; |
| 498 | else |
| 499 | cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; |
| 500 | |
| 501 | if (reg_ctrl & FLEXCAN_MB_CNT_RTR) |
| 502 | cf->can_id |= CAN_RTR_FLAG; |
| 503 | cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); |
| 504 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 505 | *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0])); |
| 506 | *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1])); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 507 | |
| 508 | /* mark as read */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 509 | flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); |
| 510 | flexcan_read(®s->timer); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | static int flexcan_read_frame(struct net_device *dev) |
| 514 | { |
| 515 | struct net_device_stats *stats = &dev->stats; |
| 516 | struct can_frame *cf; |
| 517 | struct sk_buff *skb; |
| 518 | |
| 519 | skb = alloc_can_skb(dev, &cf); |
| 520 | if (unlikely(!skb)) { |
| 521 | stats->rx_dropped++; |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | flexcan_read_fifo(dev, cf); |
| 526 | netif_receive_skb(skb); |
| 527 | |
| 528 | stats->rx_packets++; |
| 529 | stats->rx_bytes += cf->can_dlc; |
| 530 | |
| 531 | return 1; |
| 532 | } |
| 533 | |
| 534 | static int flexcan_poll(struct napi_struct *napi, int quota) |
| 535 | { |
| 536 | struct net_device *dev = napi->dev; |
| 537 | const struct flexcan_priv *priv = netdev_priv(dev); |
| 538 | struct flexcan_regs __iomem *regs = priv->base; |
| 539 | u32 reg_iflag1, reg_esr; |
| 540 | int work_done = 0; |
| 541 | |
| 542 | /* |
| 543 | * The error bits are cleared on read, |
| 544 | * use saved value from irq handler. |
| 545 | */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 546 | reg_esr = flexcan_read(®s->esr) | priv->reg_esr; |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 547 | |
| 548 | /* handle state changes */ |
| 549 | work_done += flexcan_poll_state(dev, reg_esr); |
| 550 | |
| 551 | /* handle RX-FIFO */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 552 | reg_iflag1 = flexcan_read(®s->iflag1); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 553 | while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && |
| 554 | work_done < quota) { |
| 555 | work_done += flexcan_read_frame(dev); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 556 | reg_iflag1 = flexcan_read(®s->iflag1); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 557 | } |
| 558 | |
| 559 | /* report bus errors */ |
| 560 | if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) |
| 561 | work_done += flexcan_poll_bus_err(dev, reg_esr); |
| 562 | |
| 563 | if (work_done < quota) { |
| 564 | napi_complete(napi); |
| 565 | /* enable IRQs */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 566 | flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); |
| 567 | flexcan_write(priv->reg_ctrl_default, ®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | return work_done; |
| 571 | } |
| 572 | |
| 573 | static irqreturn_t flexcan_irq(int irq, void *dev_id) |
| 574 | { |
| 575 | struct net_device *dev = dev_id; |
| 576 | struct net_device_stats *stats = &dev->stats; |
| 577 | struct flexcan_priv *priv = netdev_priv(dev); |
| 578 | struct flexcan_regs __iomem *regs = priv->base; |
| 579 | u32 reg_iflag1, reg_esr; |
| 580 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 581 | reg_iflag1 = flexcan_read(®s->iflag1); |
| 582 | reg_esr = flexcan_read(®s->esr); |
Wolfgang Grandegger | 6e9d554 | 2011-12-12 16:09:28 +0100 | [diff] [blame] | 583 | /* ACK all bus error and state change IRQ sources */ |
| 584 | if (reg_esr & FLEXCAN_ESR_ALL_INT) |
| 585 | flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 586 | |
| 587 | /* |
| 588 | * schedule NAPI in case of: |
| 589 | * - rx IRQ |
| 590 | * - state change IRQ |
| 591 | * - bus error IRQ and bus error reporting is activated |
| 592 | */ |
| 593 | if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || |
| 594 | (reg_esr & FLEXCAN_ESR_ERR_STATE) || |
| 595 | flexcan_has_and_handle_berr(priv, reg_esr)) { |
| 596 | /* |
| 597 | * The error bits are cleared on read, |
| 598 | * save them for later use. |
| 599 | */ |
| 600 | priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 601 | flexcan_write(FLEXCAN_IFLAG_DEFAULT & |
| 602 | ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); |
| 603 | flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 604 | ®s->ctrl); |
| 605 | napi_schedule(&priv->napi); |
| 606 | } |
| 607 | |
| 608 | /* FIFO overflow */ |
| 609 | if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 610 | flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 611 | dev->stats.rx_over_errors++; |
| 612 | dev->stats.rx_errors++; |
| 613 | } |
| 614 | |
| 615 | /* transmission complete interrupt */ |
| 616 | if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { |
| 617 | /* tx_bytes is incremented in flexcan_start_xmit */ |
| 618 | stats->tx_packets++; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 619 | flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 620 | netif_wake_queue(dev); |
| 621 | } |
| 622 | |
| 623 | return IRQ_HANDLED; |
| 624 | } |
| 625 | |
| 626 | static void flexcan_set_bittiming(struct net_device *dev) |
| 627 | { |
| 628 | const struct flexcan_priv *priv = netdev_priv(dev); |
| 629 | const struct can_bittiming *bt = &priv->can.bittiming; |
| 630 | struct flexcan_regs __iomem *regs = priv->base; |
| 631 | u32 reg; |
| 632 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 633 | reg = flexcan_read(®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 634 | reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | |
| 635 | FLEXCAN_CTRL_RJW(0x3) | |
| 636 | FLEXCAN_CTRL_PSEG1(0x7) | |
| 637 | FLEXCAN_CTRL_PSEG2(0x7) | |
| 638 | FLEXCAN_CTRL_PROPSEG(0x7) | |
| 639 | FLEXCAN_CTRL_LPB | |
| 640 | FLEXCAN_CTRL_SMP | |
| 641 | FLEXCAN_CTRL_LOM); |
| 642 | |
| 643 | reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | |
| 644 | FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | |
| 645 | FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | |
| 646 | FLEXCAN_CTRL_RJW(bt->sjw - 1) | |
| 647 | FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); |
| 648 | |
| 649 | if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) |
| 650 | reg |= FLEXCAN_CTRL_LPB; |
| 651 | if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) |
| 652 | reg |= FLEXCAN_CTRL_LOM; |
| 653 | if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) |
| 654 | reg |= FLEXCAN_CTRL_SMP; |
| 655 | |
| 656 | dev_info(dev->dev.parent, "writing ctrl=0x%08x\n", reg); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 657 | flexcan_write(reg, ®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 658 | |
| 659 | /* print chip status */ |
| 660 | dev_dbg(dev->dev.parent, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 661 | flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | /* |
| 665 | * flexcan_chip_start |
| 666 | * |
| 667 | * this functions is entered with clocks enabled |
| 668 | * |
| 669 | */ |
| 670 | static int flexcan_chip_start(struct net_device *dev) |
| 671 | { |
| 672 | struct flexcan_priv *priv = netdev_priv(dev); |
| 673 | struct flexcan_regs __iomem *regs = priv->base; |
| 674 | unsigned int i; |
| 675 | int err; |
| 676 | u32 reg_mcr, reg_ctrl; |
| 677 | |
| 678 | /* enable module */ |
| 679 | flexcan_chip_enable(priv); |
| 680 | |
| 681 | /* soft reset */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 682 | flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 683 | udelay(10); |
| 684 | |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 685 | reg_mcr = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 686 | if (reg_mcr & FLEXCAN_MCR_SOFTRST) { |
| 687 | dev_err(dev->dev.parent, |
| 688 | "Failed to softreset can module (mcr=0x%08x)\n", |
| 689 | reg_mcr); |
| 690 | err = -ENODEV; |
| 691 | goto out; |
| 692 | } |
| 693 | |
| 694 | flexcan_set_bittiming(dev); |
| 695 | |
| 696 | /* |
| 697 | * MCR |
| 698 | * |
| 699 | * enable freeze |
| 700 | * enable fifo |
| 701 | * halt now |
| 702 | * only supervisor access |
| 703 | * enable warning int |
| 704 | * choose format C |
| 705 | * |
| 706 | */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 707 | reg_mcr = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 708 | reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | |
| 709 | FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | |
| 710 | FLEXCAN_MCR_IDAM_C; |
| 711 | dev_dbg(dev->dev.parent, "%s: writing mcr=0x%08x", __func__, reg_mcr); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 712 | flexcan_write(reg_mcr, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 713 | |
| 714 | /* |
| 715 | * CTRL |
| 716 | * |
| 717 | * disable timer sync feature |
| 718 | * |
| 719 | * disable auto busoff recovery |
| 720 | * transmit lowest buffer first |
| 721 | * |
| 722 | * enable tx and rx warning interrupt |
| 723 | * enable bus off interrupt |
| 724 | * (== FLEXCAN_CTRL_ERR_STATE) |
| 725 | * |
| 726 | * _note_: we enable the "error interrupt" |
| 727 | * (FLEXCAN_CTRL_ERR_MSK), too. Otherwise we don't get any |
| 728 | * warning or bus passive interrupts. |
| 729 | */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 730 | reg_ctrl = flexcan_read(®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 731 | reg_ctrl &= ~FLEXCAN_CTRL_TSYN; |
| 732 | reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | |
| 733 | FLEXCAN_CTRL_ERR_STATE | FLEXCAN_CTRL_ERR_MSK; |
| 734 | |
| 735 | /* save for later use */ |
| 736 | priv->reg_ctrl_default = reg_ctrl; |
| 737 | dev_dbg(dev->dev.parent, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 738 | flexcan_write(reg_ctrl, ®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 739 | |
| 740 | for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) { |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 741 | flexcan_write(0, ®s->cantxfg[i].can_ctrl); |
| 742 | flexcan_write(0, ®s->cantxfg[i].can_id); |
| 743 | flexcan_write(0, ®s->cantxfg[i].data[0]); |
| 744 | flexcan_write(0, ®s->cantxfg[i].data[1]); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 745 | |
| 746 | /* put MB into rx queue */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 747 | flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), |
| 748 | ®s->cantxfg[i].can_ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | /* acceptance mask/acceptance code (accept everything) */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 752 | flexcan_write(0x0, ®s->rxgmask); |
| 753 | flexcan_write(0x0, ®s->rx14mask); |
| 754 | flexcan_write(0x0, ®s->rx15mask); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 755 | |
| 756 | flexcan_transceiver_switch(priv, 1); |
| 757 | |
| 758 | /* synchronize with the can bus */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 759 | reg_mcr = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 760 | reg_mcr &= ~FLEXCAN_MCR_HALT; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 761 | flexcan_write(reg_mcr, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 762 | |
| 763 | priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| 764 | |
| 765 | /* enable FIFO interrupts */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 766 | flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 767 | |
| 768 | /* print chip status */ |
| 769 | dev_dbg(dev->dev.parent, "%s: reading mcr=0x%08x ctrl=0x%08x\n", |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 770 | __func__, flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 771 | |
| 772 | return 0; |
| 773 | |
| 774 | out: |
| 775 | flexcan_chip_disable(priv); |
| 776 | return err; |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * flexcan_chip_stop |
| 781 | * |
| 782 | * this functions is entered with clocks enabled |
| 783 | * |
| 784 | */ |
| 785 | static void flexcan_chip_stop(struct net_device *dev) |
| 786 | { |
| 787 | struct flexcan_priv *priv = netdev_priv(dev); |
| 788 | struct flexcan_regs __iomem *regs = priv->base; |
| 789 | u32 reg; |
| 790 | |
| 791 | /* Disable all interrupts */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 792 | flexcan_write(0, ®s->imask1); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 793 | |
| 794 | /* Disable + halt module */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 795 | reg = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 796 | reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 797 | flexcan_write(reg, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 798 | |
| 799 | flexcan_transceiver_switch(priv, 0); |
| 800 | priv->can.state = CAN_STATE_STOPPED; |
| 801 | |
| 802 | return; |
| 803 | } |
| 804 | |
| 805 | static int flexcan_open(struct net_device *dev) |
| 806 | { |
| 807 | struct flexcan_priv *priv = netdev_priv(dev); |
| 808 | int err; |
| 809 | |
Shawn Guo | e735489 | 2011-12-20 14:05:52 +0800 | [diff] [blame] | 810 | clk_prepare_enable(priv->clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 811 | |
| 812 | err = open_candev(dev); |
| 813 | if (err) |
| 814 | goto out; |
| 815 | |
| 816 | err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); |
| 817 | if (err) |
| 818 | goto out_close; |
| 819 | |
| 820 | /* start chip and queuing */ |
| 821 | err = flexcan_chip_start(dev); |
| 822 | if (err) |
| 823 | goto out_close; |
| 824 | napi_enable(&priv->napi); |
| 825 | netif_start_queue(dev); |
| 826 | |
| 827 | return 0; |
| 828 | |
| 829 | out_close: |
| 830 | close_candev(dev); |
| 831 | out: |
Shawn Guo | e735489 | 2011-12-20 14:05:52 +0800 | [diff] [blame] | 832 | clk_disable_unprepare(priv->clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 833 | |
| 834 | return err; |
| 835 | } |
| 836 | |
| 837 | static int flexcan_close(struct net_device *dev) |
| 838 | { |
| 839 | struct flexcan_priv *priv = netdev_priv(dev); |
| 840 | |
| 841 | netif_stop_queue(dev); |
| 842 | napi_disable(&priv->napi); |
| 843 | flexcan_chip_stop(dev); |
| 844 | |
| 845 | free_irq(dev->irq, dev); |
Shawn Guo | e735489 | 2011-12-20 14:05:52 +0800 | [diff] [blame] | 846 | clk_disable_unprepare(priv->clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 847 | |
| 848 | close_candev(dev); |
| 849 | |
| 850 | return 0; |
| 851 | } |
| 852 | |
| 853 | static int flexcan_set_mode(struct net_device *dev, enum can_mode mode) |
| 854 | { |
| 855 | int err; |
| 856 | |
| 857 | switch (mode) { |
| 858 | case CAN_MODE_START: |
| 859 | err = flexcan_chip_start(dev); |
| 860 | if (err) |
| 861 | return err; |
| 862 | |
| 863 | netif_wake_queue(dev); |
| 864 | break; |
| 865 | |
| 866 | default: |
| 867 | return -EOPNOTSUPP; |
| 868 | } |
| 869 | |
| 870 | return 0; |
| 871 | } |
| 872 | |
| 873 | static const struct net_device_ops flexcan_netdev_ops = { |
| 874 | .ndo_open = flexcan_open, |
| 875 | .ndo_stop = flexcan_close, |
| 876 | .ndo_start_xmit = flexcan_start_xmit, |
| 877 | }; |
| 878 | |
| 879 | static int __devinit register_flexcandev(struct net_device *dev) |
| 880 | { |
| 881 | struct flexcan_priv *priv = netdev_priv(dev); |
| 882 | struct flexcan_regs __iomem *regs = priv->base; |
| 883 | u32 reg, err; |
| 884 | |
Shawn Guo | e735489 | 2011-12-20 14:05:52 +0800 | [diff] [blame] | 885 | clk_prepare_enable(priv->clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 886 | |
| 887 | /* select "bus clock", chip must be disabled */ |
| 888 | flexcan_chip_disable(priv); |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 889 | reg = flexcan_read(®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 890 | reg |= FLEXCAN_CTRL_CLK_SRC; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 891 | flexcan_write(reg, ®s->ctrl); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 892 | |
| 893 | flexcan_chip_enable(priv); |
| 894 | |
| 895 | /* set freeze, halt and activate FIFO, restrict register access */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 896 | reg = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 897 | reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | |
| 898 | FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 899 | flexcan_write(reg, ®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 900 | |
| 901 | /* |
| 902 | * Currently we only support newer versions of this core |
| 903 | * featuring a RX FIFO. Older cores found on some Coldfire |
| 904 | * derivates are not yet supported. |
| 905 | */ |
holt@sgi.com | 61e271e | 2011-08-16 17:32:20 +0000 | [diff] [blame] | 906 | reg = flexcan_read(®s->mcr); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 907 | if (!(reg & FLEXCAN_MCR_FEN)) { |
| 908 | dev_err(dev->dev.parent, |
| 909 | "Could not enable RX FIFO, unsupported core\n"); |
| 910 | err = -ENODEV; |
| 911 | goto out; |
| 912 | } |
| 913 | |
| 914 | err = register_candev(dev); |
| 915 | |
| 916 | out: |
| 917 | /* disable core and turn off clocks */ |
| 918 | flexcan_chip_disable(priv); |
Shawn Guo | e735489 | 2011-12-20 14:05:52 +0800 | [diff] [blame] | 919 | clk_disable_unprepare(priv->clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 920 | |
| 921 | return err; |
| 922 | } |
| 923 | |
| 924 | static void __devexit unregister_flexcandev(struct net_device *dev) |
| 925 | { |
| 926 | unregister_candev(dev); |
| 927 | } |
| 928 | |
| 929 | static int __devinit flexcan_probe(struct platform_device *pdev) |
| 930 | { |
| 931 | struct net_device *dev; |
| 932 | struct flexcan_priv *priv; |
| 933 | struct resource *mem; |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 934 | struct clk *clk = NULL; |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 935 | void __iomem *base; |
| 936 | resource_size_t mem_size; |
| 937 | int err, irq; |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 938 | u32 clock_freq = 0; |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 939 | |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 940 | if (pdev->dev.of_node) { |
| 941 | const u32 *clock_freq_p; |
| 942 | |
| 943 | clock_freq_p = of_get_property(pdev->dev.of_node, |
| 944 | "clock-frequency", NULL); |
| 945 | if (clock_freq_p) |
| 946 | clock_freq = *clock_freq_p; |
| 947 | } |
| 948 | |
| 949 | if (!clock_freq) { |
| 950 | clk = clk_get(&pdev->dev, NULL); |
| 951 | if (IS_ERR(clk)) { |
| 952 | dev_err(&pdev->dev, "no clock defined\n"); |
| 953 | err = PTR_ERR(clk); |
| 954 | goto failed_clock; |
| 955 | } |
| 956 | clock_freq = clk_get_rate(clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 960 | irq = platform_get_irq(pdev, 0); |
| 961 | if (!mem || irq <= 0) { |
| 962 | err = -ENODEV; |
| 963 | goto failed_get; |
| 964 | } |
| 965 | |
| 966 | mem_size = resource_size(mem); |
| 967 | if (!request_mem_region(mem->start, mem_size, pdev->name)) { |
| 968 | err = -EBUSY; |
Julia Lawall | 2e4ceec | 2011-06-01 19:48:50 +0000 | [diff] [blame] | 969 | goto failed_get; |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 970 | } |
| 971 | |
| 972 | base = ioremap(mem->start, mem_size); |
| 973 | if (!base) { |
| 974 | err = -ENOMEM; |
| 975 | goto failed_map; |
| 976 | } |
| 977 | |
| 978 | dev = alloc_candev(sizeof(struct flexcan_priv), 0); |
| 979 | if (!dev) { |
| 980 | err = -ENOMEM; |
| 981 | goto failed_alloc; |
| 982 | } |
| 983 | |
| 984 | dev->netdev_ops = &flexcan_netdev_ops; |
| 985 | dev->irq = irq; |
| 986 | dev->flags |= IFF_ECHO; /* we support local echo in hardware */ |
| 987 | |
| 988 | priv = netdev_priv(dev); |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 989 | priv->can.clock.freq = clock_freq; |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 990 | priv->can.bittiming_const = &flexcan_bittiming_const; |
| 991 | priv->can.do_set_mode = flexcan_set_mode; |
| 992 | priv->can.do_get_berr_counter = flexcan_get_berr_counter; |
| 993 | priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | |
| 994 | CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | |
| 995 | CAN_CTRLMODE_BERR_REPORTING; |
| 996 | priv->base = base; |
| 997 | priv->dev = dev; |
| 998 | priv->clk = clk; |
| 999 | priv->pdata = pdev->dev.platform_data; |
| 1000 | |
| 1001 | netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); |
| 1002 | |
| 1003 | dev_set_drvdata(&pdev->dev, dev); |
| 1004 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 1005 | |
| 1006 | err = register_flexcandev(dev); |
| 1007 | if (err) { |
| 1008 | dev_err(&pdev->dev, "registering netdev failed\n"); |
| 1009 | goto failed_register; |
| 1010 | } |
| 1011 | |
| 1012 | dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", |
| 1013 | priv->base, dev->irq); |
| 1014 | |
| 1015 | return 0; |
| 1016 | |
| 1017 | failed_register: |
| 1018 | free_candev(dev); |
| 1019 | failed_alloc: |
| 1020 | iounmap(base); |
| 1021 | failed_map: |
| 1022 | release_mem_region(mem->start, mem_size); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1023 | failed_get: |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 1024 | if (clk) |
| 1025 | clk_put(clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1026 | failed_clock: |
| 1027 | return err; |
| 1028 | } |
| 1029 | |
| 1030 | static int __devexit flexcan_remove(struct platform_device *pdev) |
| 1031 | { |
| 1032 | struct net_device *dev = platform_get_drvdata(pdev); |
| 1033 | struct flexcan_priv *priv = netdev_priv(dev); |
| 1034 | struct resource *mem; |
| 1035 | |
| 1036 | unregister_flexcandev(dev); |
| 1037 | platform_set_drvdata(pdev, NULL); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1038 | iounmap(priv->base); |
| 1039 | |
| 1040 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1041 | release_mem_region(mem->start, resource_size(mem)); |
| 1042 | |
holt@sgi.com | 97efe9a | 2011-08-16 17:32:23 +0000 | [diff] [blame] | 1043 | if (priv->clk) |
| 1044 | clk_put(priv->clk); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1045 | |
Marc Kleine-Budde | 9a27586 | 2010-10-21 05:07:58 +0000 | [diff] [blame] | 1046 | free_candev(dev); |
| 1047 | |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1048 | return 0; |
| 1049 | } |
| 1050 | |
holt@sgi.com | c8aef4c | 2011-08-16 17:32:22 +0000 | [diff] [blame] | 1051 | static struct of_device_id flexcan_of_match[] = { |
| 1052 | { |
| 1053 | .compatible = "fsl,p1010-flexcan", |
| 1054 | }, |
| 1055 | {}, |
| 1056 | }; |
| 1057 | |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1058 | static struct platform_driver flexcan_driver = { |
holt@sgi.com | c8aef4c | 2011-08-16 17:32:22 +0000 | [diff] [blame] | 1059 | .driver = { |
| 1060 | .name = DRV_NAME, |
| 1061 | .owner = THIS_MODULE, |
| 1062 | .of_match_table = flexcan_of_match, |
| 1063 | }, |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1064 | .probe = flexcan_probe, |
| 1065 | .remove = __devexit_p(flexcan_remove), |
| 1066 | }; |
| 1067 | |
Axel Lin | 871d337 | 2011-11-27 15:42:31 +0000 | [diff] [blame] | 1068 | module_platform_driver(flexcan_driver); |
Marc Kleine-Budde | e955cea | 2009-07-29 10:20:10 +0200 | [diff] [blame] | 1069 | |
| 1070 | MODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " |
| 1071 | "Marc Kleine-Budde <kernel@pengutronix.de>"); |
| 1072 | MODULE_LICENSE("GPL v2"); |
| 1073 | MODULE_DESCRIPTION("CAN port driver for flexcan based chip"); |