Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * CAN bus driver for Microchip 251x CAN Controller with SPI Interface |
| 3 | * |
| 4 | * MCP2510 support and bug fixes by Christian Pellegrin |
| 5 | * <chripell@evolware.org> |
| 6 | * |
| 7 | * Copyright 2009 Christian Pellegrin EVOL S.r.l. |
| 8 | * |
| 9 | * Copyright 2007 Raymarine UK, Ltd. All Rights Reserved. |
| 10 | * Written under contract by: |
| 11 | * Chris Elston, Katalix Systems, Ltd. |
| 12 | * |
| 13 | * Based on Microchip MCP251x CAN controller driver written by |
| 14 | * David Vrabel, Copyright 2006 Arcom Control Systems Ltd. |
| 15 | * |
| 16 | * Based on CAN bus driver for the CCAN controller written by |
| 17 | * - Sascha Hauer, Marc Kleine-Budde, Pengutronix |
| 18 | * - Simon Kallweit, intefo AG |
| 19 | * Copyright 2007 |
| 20 | * |
| 21 | * This program is free software; you can redistribute it and/or modify |
| 22 | * it under the terms of the version 2 of the GNU General Public License |
| 23 | * as published by the Free Software Foundation |
| 24 | * |
| 25 | * This program is distributed in the hope that it will be useful, |
| 26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 28 | * GNU General Public License for more details. |
| 29 | * |
| 30 | * You should have received a copy of the GNU General Public License |
| 31 | * along with this program; if not, write to the Free Software |
| 32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 33 | * |
| 34 | * |
| 35 | * |
| 36 | * Your platform definition file should specify something like: |
| 37 | * |
| 38 | * static struct mcp251x_platform_data mcp251x_info = { |
| 39 | * .oscillator_frequency = 8000000, |
| 40 | * .board_specific_setup = &mcp251x_setup, |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 41 | * .power_enable = mcp251x_power_enable, |
| 42 | * .transceiver_enable = NULL, |
| 43 | * }; |
| 44 | * |
| 45 | * static struct spi_board_info spi_board_info[] = { |
| 46 | * { |
Marc Kleine-Budde | f1f8c6c | 2010-10-18 15:00:18 +0200 | [diff] [blame] | 47 | * .modalias = "mcp2510", |
| 48 | * // or "mcp2515" depending on your controller |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 49 | * .platform_data = &mcp251x_info, |
| 50 | * .irq = IRQ_EINT13, |
| 51 | * .max_speed_hz = 2*1000*1000, |
| 52 | * .chip_select = 2, |
| 53 | * }, |
| 54 | * }; |
| 55 | * |
| 56 | * Please see mcp251x.h for a description of the fields in |
| 57 | * struct mcp251x_platform_data. |
| 58 | * |
| 59 | */ |
| 60 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 61 | #include <linux/can/core.h> |
| 62 | #include <linux/can/dev.h> |
| 63 | #include <linux/can/platform/mcp251x.h> |
| 64 | #include <linux/completion.h> |
| 65 | #include <linux/delay.h> |
| 66 | #include <linux/device.h> |
| 67 | #include <linux/dma-mapping.h> |
| 68 | #include <linux/freezer.h> |
| 69 | #include <linux/interrupt.h> |
| 70 | #include <linux/io.h> |
| 71 | #include <linux/kernel.h> |
| 72 | #include <linux/module.h> |
| 73 | #include <linux/netdevice.h> |
| 74 | #include <linux/platform_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 75 | #include <linux/slab.h> |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 76 | #include <linux/spi/spi.h> |
| 77 | #include <linux/uaccess.h> |
| 78 | |
| 79 | /* SPI interface instruction set */ |
| 80 | #define INSTRUCTION_WRITE 0x02 |
| 81 | #define INSTRUCTION_READ 0x03 |
| 82 | #define INSTRUCTION_BIT_MODIFY 0x05 |
| 83 | #define INSTRUCTION_LOAD_TXB(n) (0x40 + 2 * (n)) |
| 84 | #define INSTRUCTION_READ_RXB(n) (((n) == 0) ? 0x90 : 0x94) |
| 85 | #define INSTRUCTION_RESET 0xC0 |
| 86 | |
| 87 | /* MPC251x registers */ |
| 88 | #define CANSTAT 0x0e |
| 89 | #define CANCTRL 0x0f |
| 90 | # define CANCTRL_REQOP_MASK 0xe0 |
| 91 | # define CANCTRL_REQOP_CONF 0x80 |
| 92 | # define CANCTRL_REQOP_LISTEN_ONLY 0x60 |
| 93 | # define CANCTRL_REQOP_LOOPBACK 0x40 |
| 94 | # define CANCTRL_REQOP_SLEEP 0x20 |
| 95 | # define CANCTRL_REQOP_NORMAL 0x00 |
| 96 | # define CANCTRL_OSM 0x08 |
| 97 | # define CANCTRL_ABAT 0x10 |
| 98 | #define TEC 0x1c |
| 99 | #define REC 0x1d |
| 100 | #define CNF1 0x2a |
| 101 | # define CNF1_SJW_SHIFT 6 |
| 102 | #define CNF2 0x29 |
| 103 | # define CNF2_BTLMODE 0x80 |
| 104 | # define CNF2_SAM 0x40 |
| 105 | # define CNF2_PS1_SHIFT 3 |
| 106 | #define CNF3 0x28 |
| 107 | # define CNF3_SOF 0x08 |
| 108 | # define CNF3_WAKFIL 0x04 |
| 109 | # define CNF3_PHSEG2_MASK 0x07 |
| 110 | #define CANINTE 0x2b |
| 111 | # define CANINTE_MERRE 0x80 |
| 112 | # define CANINTE_WAKIE 0x40 |
| 113 | # define CANINTE_ERRIE 0x20 |
| 114 | # define CANINTE_TX2IE 0x10 |
| 115 | # define CANINTE_TX1IE 0x08 |
| 116 | # define CANINTE_TX0IE 0x04 |
| 117 | # define CANINTE_RX1IE 0x02 |
| 118 | # define CANINTE_RX0IE 0x01 |
| 119 | #define CANINTF 0x2c |
| 120 | # define CANINTF_MERRF 0x80 |
| 121 | # define CANINTF_WAKIF 0x40 |
| 122 | # define CANINTF_ERRIF 0x20 |
| 123 | # define CANINTF_TX2IF 0x10 |
| 124 | # define CANINTF_TX1IF 0x08 |
| 125 | # define CANINTF_TX0IF 0x04 |
| 126 | # define CANINTF_RX1IF 0x02 |
| 127 | # define CANINTF_RX0IF 0x01 |
Marc Kleine-Budde | d3cd156 | 2010-09-28 10:18:34 +0200 | [diff] [blame] | 128 | # define CANINTF_ERR_TX \ |
| 129 | (CANINTF_ERRIF | CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 130 | #define EFLG 0x2d |
| 131 | # define EFLG_EWARN 0x01 |
| 132 | # define EFLG_RXWAR 0x02 |
| 133 | # define EFLG_TXWAR 0x04 |
| 134 | # define EFLG_RXEP 0x08 |
| 135 | # define EFLG_TXEP 0x10 |
| 136 | # define EFLG_TXBO 0x20 |
| 137 | # define EFLG_RX0OVR 0x40 |
| 138 | # define EFLG_RX1OVR 0x80 |
| 139 | #define TXBCTRL(n) (((n) * 0x10) + 0x30 + TXBCTRL_OFF) |
| 140 | # define TXBCTRL_ABTF 0x40 |
| 141 | # define TXBCTRL_MLOA 0x20 |
| 142 | # define TXBCTRL_TXERR 0x10 |
| 143 | # define TXBCTRL_TXREQ 0x08 |
| 144 | #define TXBSIDH(n) (((n) * 0x10) + 0x30 + TXBSIDH_OFF) |
| 145 | # define SIDH_SHIFT 3 |
| 146 | #define TXBSIDL(n) (((n) * 0x10) + 0x30 + TXBSIDL_OFF) |
| 147 | # define SIDL_SID_MASK 7 |
| 148 | # define SIDL_SID_SHIFT 5 |
| 149 | # define SIDL_EXIDE_SHIFT 3 |
| 150 | # define SIDL_EID_SHIFT 16 |
| 151 | # define SIDL_EID_MASK 3 |
| 152 | #define TXBEID8(n) (((n) * 0x10) + 0x30 + TXBEID8_OFF) |
| 153 | #define TXBEID0(n) (((n) * 0x10) + 0x30 + TXBEID0_OFF) |
| 154 | #define TXBDLC(n) (((n) * 0x10) + 0x30 + TXBDLC_OFF) |
| 155 | # define DLC_RTR_SHIFT 6 |
| 156 | #define TXBCTRL_OFF 0 |
| 157 | #define TXBSIDH_OFF 1 |
| 158 | #define TXBSIDL_OFF 2 |
| 159 | #define TXBEID8_OFF 3 |
| 160 | #define TXBEID0_OFF 4 |
| 161 | #define TXBDLC_OFF 5 |
| 162 | #define TXBDAT_OFF 6 |
| 163 | #define RXBCTRL(n) (((n) * 0x10) + 0x60 + RXBCTRL_OFF) |
| 164 | # define RXBCTRL_BUKT 0x04 |
| 165 | # define RXBCTRL_RXM0 0x20 |
| 166 | # define RXBCTRL_RXM1 0x40 |
| 167 | #define RXBSIDH(n) (((n) * 0x10) + 0x60 + RXBSIDH_OFF) |
| 168 | # define RXBSIDH_SHIFT 3 |
| 169 | #define RXBSIDL(n) (((n) * 0x10) + 0x60 + RXBSIDL_OFF) |
| 170 | # define RXBSIDL_IDE 0x08 |
| 171 | # define RXBSIDL_EID 3 |
| 172 | # define RXBSIDL_SHIFT 5 |
| 173 | #define RXBEID8(n) (((n) * 0x10) + 0x60 + RXBEID8_OFF) |
| 174 | #define RXBEID0(n) (((n) * 0x10) + 0x60 + RXBEID0_OFF) |
| 175 | #define RXBDLC(n) (((n) * 0x10) + 0x60 + RXBDLC_OFF) |
| 176 | # define RXBDLC_LEN_MASK 0x0f |
| 177 | # define RXBDLC_RTR 0x40 |
| 178 | #define RXBCTRL_OFF 0 |
| 179 | #define RXBSIDH_OFF 1 |
| 180 | #define RXBSIDL_OFF 2 |
| 181 | #define RXBEID8_OFF 3 |
| 182 | #define RXBEID0_OFF 4 |
| 183 | #define RXBDLC_OFF 5 |
| 184 | #define RXBDAT_OFF 6 |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 185 | #define RXFSIDH(n) ((n) * 4) |
| 186 | #define RXFSIDL(n) ((n) * 4 + 1) |
| 187 | #define RXFEID8(n) ((n) * 4 + 2) |
| 188 | #define RXFEID0(n) ((n) * 4 + 3) |
| 189 | #define RXMSIDH(n) ((n) * 4 + 0x20) |
| 190 | #define RXMSIDL(n) ((n) * 4 + 0x21) |
| 191 | #define RXMEID8(n) ((n) * 4 + 0x22) |
| 192 | #define RXMEID0(n) ((n) * 4 + 0x23) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 193 | |
| 194 | #define GET_BYTE(val, byte) \ |
| 195 | (((val) >> ((byte) * 8)) & 0xff) |
| 196 | #define SET_BYTE(val, byte) \ |
| 197 | (((val) & 0xff) << ((byte) * 8)) |
| 198 | |
| 199 | /* |
| 200 | * Buffer size required for the largest SPI transfer (i.e., reading a |
| 201 | * frame) |
| 202 | */ |
| 203 | #define CAN_FRAME_MAX_DATA_LEN 8 |
| 204 | #define SPI_TRANSFER_BUF_LEN (6 + CAN_FRAME_MAX_DATA_LEN) |
| 205 | #define CAN_FRAME_MAX_BITS 128 |
| 206 | |
| 207 | #define TX_ECHO_SKB_MAX 1 |
| 208 | |
| 209 | #define DEVICE_NAME "mcp251x" |
| 210 | |
| 211 | static int mcp251x_enable_dma; /* Enable SPI DMA. Default: 0 (Off) */ |
| 212 | module_param(mcp251x_enable_dma, int, S_IRUGO); |
| 213 | MODULE_PARM_DESC(mcp251x_enable_dma, "Enable SPI DMA. Default: 0 (Off)"); |
| 214 | |
| 215 | static struct can_bittiming_const mcp251x_bittiming_const = { |
| 216 | .name = DEVICE_NAME, |
| 217 | .tseg1_min = 3, |
| 218 | .tseg1_max = 16, |
| 219 | .tseg2_min = 2, |
| 220 | .tseg2_max = 8, |
| 221 | .sjw_max = 4, |
| 222 | .brp_min = 1, |
| 223 | .brp_max = 64, |
| 224 | .brp_inc = 1, |
| 225 | }; |
| 226 | |
Marc Kleine-Budde | f1f8c6c | 2010-10-18 15:00:18 +0200 | [diff] [blame] | 227 | enum mcp251x_model { |
| 228 | CAN_MCP251X_MCP2510 = 0x2510, |
| 229 | CAN_MCP251X_MCP2515 = 0x2515, |
| 230 | }; |
| 231 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 232 | struct mcp251x_priv { |
| 233 | struct can_priv can; |
| 234 | struct net_device *net; |
| 235 | struct spi_device *spi; |
Marc Kleine-Budde | f1f8c6c | 2010-10-18 15:00:18 +0200 | [diff] [blame] | 236 | enum mcp251x_model model; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 237 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 238 | struct mutex mcp_lock; /* SPI device lock */ |
| 239 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 240 | u8 *spi_tx_buf; |
| 241 | u8 *spi_rx_buf; |
| 242 | dma_addr_t spi_tx_dma; |
| 243 | dma_addr_t spi_rx_dma; |
| 244 | |
| 245 | struct sk_buff *tx_skb; |
| 246 | int tx_len; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 247 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 248 | struct workqueue_struct *wq; |
| 249 | struct work_struct tx_work; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 250 | struct work_struct restart_work; |
| 251 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 252 | int force_quit; |
| 253 | int after_suspend; |
| 254 | #define AFTER_SUSPEND_UP 1 |
| 255 | #define AFTER_SUSPEND_DOWN 2 |
| 256 | #define AFTER_SUSPEND_POWER 4 |
| 257 | #define AFTER_SUSPEND_RESTART 8 |
| 258 | int restart_tx; |
| 259 | }; |
| 260 | |
Marc Kleine-Budde | beab675 | 2010-09-23 21:34:28 +0200 | [diff] [blame] | 261 | #define MCP251X_IS(_model) \ |
| 262 | static inline int mcp251x_is_##_model(struct spi_device *spi) \ |
| 263 | { \ |
| 264 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); \ |
| 265 | return priv->model == CAN_MCP251X_MCP##_model; \ |
| 266 | } |
| 267 | |
| 268 | MCP251X_IS(2510); |
| 269 | MCP251X_IS(2515); |
| 270 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 271 | static void mcp251x_clean(struct net_device *net) |
| 272 | { |
| 273 | struct mcp251x_priv *priv = netdev_priv(net); |
| 274 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 275 | if (priv->tx_skb || priv->tx_len) |
| 276 | net->stats.tx_errors++; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 277 | if (priv->tx_skb) |
| 278 | dev_kfree_skb(priv->tx_skb); |
| 279 | if (priv->tx_len) |
| 280 | can_free_echo_skb(priv->net, 0); |
| 281 | priv->tx_skb = NULL; |
| 282 | priv->tx_len = 0; |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * Note about handling of error return of mcp251x_spi_trans: accessing |
| 287 | * registers via SPI is not really different conceptually than using |
| 288 | * normal I/O assembler instructions, although it's much more |
| 289 | * complicated from a practical POV. So it's not advisable to always |
| 290 | * check the return value of this function. Imagine that every |
| 291 | * read{b,l}, write{b,l} and friends would be bracketed in "if ( < 0) |
| 292 | * error();", it would be a great mess (well there are some situation |
| 293 | * when exception handling C++ like could be useful after all). So we |
| 294 | * just check that transfers are OK at the beginning of our |
| 295 | * conversation with the chip and to avoid doing really nasty things |
| 296 | * (like injecting bogus packets in the network stack). |
| 297 | */ |
| 298 | static int mcp251x_spi_trans(struct spi_device *spi, int len) |
| 299 | { |
| 300 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 301 | struct spi_transfer t = { |
| 302 | .tx_buf = priv->spi_tx_buf, |
| 303 | .rx_buf = priv->spi_rx_buf, |
| 304 | .len = len, |
| 305 | .cs_change = 0, |
| 306 | }; |
| 307 | struct spi_message m; |
| 308 | int ret; |
| 309 | |
| 310 | spi_message_init(&m); |
| 311 | |
| 312 | if (mcp251x_enable_dma) { |
| 313 | t.tx_dma = priv->spi_tx_dma; |
| 314 | t.rx_dma = priv->spi_rx_dma; |
| 315 | m.is_dma_mapped = 1; |
| 316 | } |
| 317 | |
| 318 | spi_message_add_tail(&t, &m); |
| 319 | |
| 320 | ret = spi_sync(spi, &m); |
| 321 | if (ret) |
| 322 | dev_err(&spi->dev, "spi transfer failed: ret = %d\n", ret); |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg) |
| 327 | { |
| 328 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 329 | u8 val = 0; |
| 330 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 331 | priv->spi_tx_buf[0] = INSTRUCTION_READ; |
| 332 | priv->spi_tx_buf[1] = reg; |
| 333 | |
| 334 | mcp251x_spi_trans(spi, 3); |
| 335 | val = priv->spi_rx_buf[2]; |
| 336 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 337 | return val; |
| 338 | } |
| 339 | |
Sascha Hauer | f3a3ed3 | 2010-09-28 09:53:35 +0200 | [diff] [blame] | 340 | static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg, |
| 341 | uint8_t *v1, uint8_t *v2) |
| 342 | { |
| 343 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 344 | |
| 345 | priv->spi_tx_buf[0] = INSTRUCTION_READ; |
| 346 | priv->spi_tx_buf[1] = reg; |
| 347 | |
| 348 | mcp251x_spi_trans(spi, 4); |
| 349 | |
| 350 | *v1 = priv->spi_rx_buf[2]; |
| 351 | *v2 = priv->spi_rx_buf[3]; |
| 352 | } |
| 353 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 354 | static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val) |
| 355 | { |
| 356 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 357 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 358 | priv->spi_tx_buf[0] = INSTRUCTION_WRITE; |
| 359 | priv->spi_tx_buf[1] = reg; |
| 360 | priv->spi_tx_buf[2] = val; |
| 361 | |
| 362 | mcp251x_spi_trans(spi, 3); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static void mcp251x_write_bits(struct spi_device *spi, u8 reg, |
| 366 | u8 mask, uint8_t val) |
| 367 | { |
| 368 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 369 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 370 | priv->spi_tx_buf[0] = INSTRUCTION_BIT_MODIFY; |
| 371 | priv->spi_tx_buf[1] = reg; |
| 372 | priv->spi_tx_buf[2] = mask; |
| 373 | priv->spi_tx_buf[3] = val; |
| 374 | |
| 375 | mcp251x_spi_trans(spi, 4); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf, |
| 379 | int len, int tx_buf_idx) |
| 380 | { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 381 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 382 | |
Marc Kleine-Budde | beab675 | 2010-09-23 21:34:28 +0200 | [diff] [blame] | 383 | if (mcp251x_is_2510(spi)) { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 384 | int i; |
| 385 | |
| 386 | for (i = 1; i < TXBDAT_OFF + len; i++) |
| 387 | mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx) + i, |
| 388 | buf[i]); |
| 389 | } else { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 390 | memcpy(priv->spi_tx_buf, buf, TXBDAT_OFF + len); |
| 391 | mcp251x_spi_trans(spi, TXBDAT_OFF + len); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 392 | } |
| 393 | } |
| 394 | |
| 395 | static void mcp251x_hw_tx(struct spi_device *spi, struct can_frame *frame, |
| 396 | int tx_buf_idx) |
| 397 | { |
| 398 | u32 sid, eid, exide, rtr; |
| 399 | u8 buf[SPI_TRANSFER_BUF_LEN]; |
| 400 | |
| 401 | exide = (frame->can_id & CAN_EFF_FLAG) ? 1 : 0; /* Extended ID Enable */ |
| 402 | if (exide) |
| 403 | sid = (frame->can_id & CAN_EFF_MASK) >> 18; |
| 404 | else |
| 405 | sid = frame->can_id & CAN_SFF_MASK; /* Standard ID */ |
| 406 | eid = frame->can_id & CAN_EFF_MASK; /* Extended ID */ |
| 407 | rtr = (frame->can_id & CAN_RTR_FLAG) ? 1 : 0; /* Remote transmission */ |
| 408 | |
| 409 | buf[TXBCTRL_OFF] = INSTRUCTION_LOAD_TXB(tx_buf_idx); |
| 410 | buf[TXBSIDH_OFF] = sid >> SIDH_SHIFT; |
| 411 | buf[TXBSIDL_OFF] = ((sid & SIDL_SID_MASK) << SIDL_SID_SHIFT) | |
| 412 | (exide << SIDL_EXIDE_SHIFT) | |
| 413 | ((eid >> SIDL_EID_SHIFT) & SIDL_EID_MASK); |
| 414 | buf[TXBEID8_OFF] = GET_BYTE(eid, 1); |
| 415 | buf[TXBEID0_OFF] = GET_BYTE(eid, 0); |
| 416 | buf[TXBDLC_OFF] = (rtr << DLC_RTR_SHIFT) | frame->can_dlc; |
| 417 | memcpy(buf + TXBDAT_OFF, frame->data, frame->can_dlc); |
| 418 | mcp251x_hw_tx_frame(spi, buf, frame->can_dlc, tx_buf_idx); |
| 419 | mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx), TXBCTRL_TXREQ); |
| 420 | } |
| 421 | |
| 422 | static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf, |
| 423 | int buf_idx) |
| 424 | { |
| 425 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 426 | |
Marc Kleine-Budde | beab675 | 2010-09-23 21:34:28 +0200 | [diff] [blame] | 427 | if (mcp251x_is_2510(spi)) { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 428 | int i, len; |
| 429 | |
| 430 | for (i = 1; i < RXBDAT_OFF; i++) |
| 431 | buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i); |
Oliver Hartkopp | c7cd606 | 2009-12-12 04:13:21 +0000 | [diff] [blame] | 432 | |
| 433 | len = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 434 | for (; i < (RXBDAT_OFF + len); i++) |
| 435 | buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i); |
| 436 | } else { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 437 | priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx); |
| 438 | mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN); |
| 439 | memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 440 | } |
| 441 | } |
| 442 | |
| 443 | static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx) |
| 444 | { |
| 445 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 446 | struct sk_buff *skb; |
| 447 | struct can_frame *frame; |
| 448 | u8 buf[SPI_TRANSFER_BUF_LEN]; |
| 449 | |
| 450 | skb = alloc_can_skb(priv->net, &frame); |
| 451 | if (!skb) { |
| 452 | dev_err(&spi->dev, "cannot allocate RX skb\n"); |
| 453 | priv->net->stats.rx_dropped++; |
| 454 | return; |
| 455 | } |
| 456 | |
| 457 | mcp251x_hw_rx_frame(spi, buf, buf_idx); |
| 458 | if (buf[RXBSIDL_OFF] & RXBSIDL_IDE) { |
| 459 | /* Extended ID format */ |
| 460 | frame->can_id = CAN_EFF_FLAG; |
| 461 | frame->can_id |= |
| 462 | /* Extended ID part */ |
| 463 | SET_BYTE(buf[RXBSIDL_OFF] & RXBSIDL_EID, 2) | |
| 464 | SET_BYTE(buf[RXBEID8_OFF], 1) | |
| 465 | SET_BYTE(buf[RXBEID0_OFF], 0) | |
| 466 | /* Standard ID part */ |
| 467 | (((buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) | |
| 468 | (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT)) << 18); |
| 469 | /* Remote transmission request */ |
| 470 | if (buf[RXBDLC_OFF] & RXBDLC_RTR) |
| 471 | frame->can_id |= CAN_RTR_FLAG; |
| 472 | } else { |
| 473 | /* Standard ID format */ |
| 474 | frame->can_id = |
| 475 | (buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) | |
| 476 | (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT); |
| 477 | } |
| 478 | /* Data length */ |
Oliver Hartkopp | c7cd606 | 2009-12-12 04:13:21 +0000 | [diff] [blame] | 479 | frame->can_dlc = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 480 | memcpy(frame->data, buf + RXBDAT_OFF, frame->can_dlc); |
| 481 | |
| 482 | priv->net->stats.rx_packets++; |
| 483 | priv->net->stats.rx_bytes += frame->can_dlc; |
Marc Kleine-Budde | 57d3c7b | 2010-10-04 10:50:51 +0200 | [diff] [blame] | 484 | netif_rx_ni(skb); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | static void mcp251x_hw_sleep(struct spi_device *spi) |
| 488 | { |
| 489 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_SLEEP); |
| 490 | } |
| 491 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 492 | static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb, |
| 493 | struct net_device *net) |
| 494 | { |
| 495 | struct mcp251x_priv *priv = netdev_priv(net); |
| 496 | struct spi_device *spi = priv->spi; |
| 497 | |
| 498 | if (priv->tx_skb || priv->tx_len) { |
| 499 | dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 500 | return NETDEV_TX_BUSY; |
| 501 | } |
| 502 | |
Oliver Hartkopp | 3ccd4c6 | 2010-01-12 02:00:46 -0800 | [diff] [blame] | 503 | if (can_dropped_invalid_skb(net, skb)) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 504 | return NETDEV_TX_OK; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 505 | |
| 506 | netif_stop_queue(net); |
| 507 | priv->tx_skb = skb; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 508 | queue_work(priv->wq, &priv->tx_work); |
| 509 | |
| 510 | return NETDEV_TX_OK; |
| 511 | } |
| 512 | |
| 513 | static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode) |
| 514 | { |
| 515 | struct mcp251x_priv *priv = netdev_priv(net); |
| 516 | |
| 517 | switch (mode) { |
| 518 | case CAN_MODE_START: |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 519 | mcp251x_clean(net); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 520 | /* We have to delay work since SPI I/O may sleep */ |
| 521 | priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| 522 | priv->restart_tx = 1; |
| 523 | if (priv->can.restart_ms == 0) |
| 524 | priv->after_suspend = AFTER_SUSPEND_RESTART; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 525 | queue_work(priv->wq, &priv->restart_work); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 526 | break; |
| 527 | default: |
| 528 | return -EOPNOTSUPP; |
| 529 | } |
| 530 | |
| 531 | return 0; |
| 532 | } |
| 533 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 534 | static int mcp251x_set_normal_mode(struct spi_device *spi) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 535 | { |
| 536 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 537 | unsigned long timeout; |
| 538 | |
| 539 | /* Enable interrupts */ |
| 540 | mcp251x_write_reg(spi, CANINTE, |
| 541 | CANINTE_ERRIE | CANINTE_TX2IE | CANINTE_TX1IE | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 542 | CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 543 | |
| 544 | if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) { |
| 545 | /* Put device into loopback mode */ |
| 546 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LOOPBACK); |
Christian Pellegrin | ad72c34 | 2010-01-14 07:08:34 +0000 | [diff] [blame] | 547 | } else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) { |
| 548 | /* Put device into listen-only mode */ |
| 549 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 550 | } else { |
| 551 | /* Put device into normal mode */ |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 552 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 553 | |
| 554 | /* Wait for the device to enter normal mode */ |
| 555 | timeout = jiffies + HZ; |
| 556 | while (mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) { |
| 557 | schedule(); |
| 558 | if (time_after(jiffies, timeout)) { |
| 559 | dev_err(&spi->dev, "MCP251x didn't" |
| 560 | " enter in normal mode\n"); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 561 | return -EBUSY; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 562 | } |
| 563 | } |
| 564 | } |
| 565 | priv->can.state = CAN_STATE_ERROR_ACTIVE; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 566 | return 0; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | static int mcp251x_do_set_bittiming(struct net_device *net) |
| 570 | { |
| 571 | struct mcp251x_priv *priv = netdev_priv(net); |
| 572 | struct can_bittiming *bt = &priv->can.bittiming; |
| 573 | struct spi_device *spi = priv->spi; |
| 574 | |
| 575 | mcp251x_write_reg(spi, CNF1, ((bt->sjw - 1) << CNF1_SJW_SHIFT) | |
| 576 | (bt->brp - 1)); |
| 577 | mcp251x_write_reg(spi, CNF2, CNF2_BTLMODE | |
| 578 | (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES ? |
| 579 | CNF2_SAM : 0) | |
| 580 | ((bt->phase_seg1 - 1) << CNF2_PS1_SHIFT) | |
| 581 | (bt->prop_seg - 1)); |
| 582 | mcp251x_write_bits(spi, CNF3, CNF3_PHSEG2_MASK, |
| 583 | (bt->phase_seg2 - 1)); |
| 584 | dev_info(&spi->dev, "CNF: 0x%02x 0x%02x 0x%02x\n", |
| 585 | mcp251x_read_reg(spi, CNF1), |
| 586 | mcp251x_read_reg(spi, CNF2), |
| 587 | mcp251x_read_reg(spi, CNF3)); |
| 588 | |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | static int mcp251x_setup(struct net_device *net, struct mcp251x_priv *priv, |
| 593 | struct spi_device *spi) |
| 594 | { |
Christian Pellegrin | 615534b | 2009-11-17 06:20:44 +0000 | [diff] [blame] | 595 | mcp251x_do_set_bittiming(net); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 596 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 597 | mcp251x_write_reg(spi, RXBCTRL(0), |
| 598 | RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1); |
| 599 | mcp251x_write_reg(spi, RXBCTRL(1), |
| 600 | RXBCTRL_RXM0 | RXBCTRL_RXM1); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 601 | return 0; |
| 602 | } |
| 603 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 604 | static int mcp251x_hw_reset(struct spi_device *spi) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 605 | { |
| 606 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 607 | int ret; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 608 | unsigned long timeout; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 609 | |
| 610 | priv->spi_tx_buf[0] = INSTRUCTION_RESET; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 611 | ret = spi_write(spi, priv->spi_tx_buf, 1); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 612 | if (ret) { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 613 | dev_err(&spi->dev, "reset failed: ret = %d\n", ret); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 614 | return -EIO; |
| 615 | } |
| 616 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 617 | /* Wait for reset to finish */ |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 618 | timeout = jiffies + HZ; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 619 | mdelay(10); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 620 | while ((mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) |
| 621 | != CANCTRL_REQOP_CONF) { |
| 622 | schedule(); |
| 623 | if (time_after(jiffies, timeout)) { |
| 624 | dev_err(&spi->dev, "MCP251x didn't" |
| 625 | " enter in conf mode after reset\n"); |
| 626 | return -EBUSY; |
| 627 | } |
| 628 | } |
| 629 | return 0; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | static int mcp251x_hw_probe(struct spi_device *spi) |
| 633 | { |
| 634 | int st1, st2; |
| 635 | |
| 636 | mcp251x_hw_reset(spi); |
| 637 | |
| 638 | /* |
| 639 | * Please note that these are "magic values" based on after |
| 640 | * reset defaults taken from data sheet which allows us to see |
| 641 | * if we really have a chip on the bus (we avoid common all |
| 642 | * zeroes or all ones situations) |
| 643 | */ |
| 644 | st1 = mcp251x_read_reg(spi, CANSTAT) & 0xEE; |
| 645 | st2 = mcp251x_read_reg(spi, CANCTRL) & 0x17; |
| 646 | |
| 647 | dev_dbg(&spi->dev, "CANSTAT 0x%02x CANCTRL 0x%02x\n", st1, st2); |
| 648 | |
| 649 | /* Check for power up default values */ |
| 650 | return (st1 == 0x80 && st2 == 0x07) ? 1 : 0; |
| 651 | } |
| 652 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 653 | static void mcp251x_open_clean(struct net_device *net) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 654 | { |
| 655 | struct mcp251x_priv *priv = netdev_priv(net); |
| 656 | struct spi_device *spi = priv->spi; |
| 657 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 658 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 659 | free_irq(spi->irq, priv); |
| 660 | mcp251x_hw_sleep(spi); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 661 | if (pdata->transceiver_enable) |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 662 | pdata->transceiver_enable(0); |
| 663 | close_candev(net); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | static int mcp251x_stop(struct net_device *net) |
| 667 | { |
| 668 | struct mcp251x_priv *priv = netdev_priv(net); |
| 669 | struct spi_device *spi = priv->spi; |
| 670 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
| 671 | |
| 672 | close_candev(net); |
| 673 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 674 | priv->force_quit = 1; |
| 675 | free_irq(spi->irq, priv); |
| 676 | destroy_workqueue(priv->wq); |
| 677 | priv->wq = NULL; |
| 678 | |
| 679 | mutex_lock(&priv->mcp_lock); |
| 680 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 681 | /* Disable and clear pending interrupts */ |
| 682 | mcp251x_write_reg(spi, CANINTE, 0x00); |
| 683 | mcp251x_write_reg(spi, CANINTF, 0x00); |
| 684 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 685 | mcp251x_write_reg(spi, TXBCTRL(0), 0); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 686 | mcp251x_clean(net); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 687 | |
| 688 | mcp251x_hw_sleep(spi); |
| 689 | |
| 690 | if (pdata->transceiver_enable) |
| 691 | pdata->transceiver_enable(0); |
| 692 | |
| 693 | priv->can.state = CAN_STATE_STOPPED; |
| 694 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 695 | mutex_unlock(&priv->mcp_lock); |
| 696 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 697 | return 0; |
| 698 | } |
| 699 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 700 | static void mcp251x_error_skb(struct net_device *net, int can_id, int data1) |
| 701 | { |
| 702 | struct sk_buff *skb; |
| 703 | struct can_frame *frame; |
| 704 | |
| 705 | skb = alloc_can_err_skb(net, &frame); |
| 706 | if (skb) { |
| 707 | frame->can_id = can_id; |
| 708 | frame->data[1] = data1; |
Marc Kleine-Budde | 57d3c7b | 2010-10-04 10:50:51 +0200 | [diff] [blame] | 709 | netif_rx_ni(skb); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 710 | } else { |
| 711 | dev_err(&net->dev, |
| 712 | "cannot allocate error skb\n"); |
| 713 | } |
| 714 | } |
| 715 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 716 | static void mcp251x_tx_work_handler(struct work_struct *ws) |
| 717 | { |
| 718 | struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv, |
| 719 | tx_work); |
| 720 | struct spi_device *spi = priv->spi; |
| 721 | struct net_device *net = priv->net; |
| 722 | struct can_frame *frame; |
| 723 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 724 | mutex_lock(&priv->mcp_lock); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 725 | if (priv->tx_skb) { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 726 | if (priv->can.state == CAN_STATE_BUS_OFF) { |
| 727 | mcp251x_clean(net); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 728 | } else { |
| 729 | frame = (struct can_frame *)priv->tx_skb->data; |
| 730 | |
| 731 | if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN) |
| 732 | frame->can_dlc = CAN_FRAME_MAX_DATA_LEN; |
| 733 | mcp251x_hw_tx(spi, frame, 0); |
| 734 | priv->tx_len = 1 + frame->can_dlc; |
| 735 | can_put_echo_skb(priv->tx_skb, net, 0); |
| 736 | priv->tx_skb = NULL; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 737 | } |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 738 | } |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 739 | mutex_unlock(&priv->mcp_lock); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 740 | } |
| 741 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 742 | static void mcp251x_restart_work_handler(struct work_struct *ws) |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 743 | { |
| 744 | struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv, |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 745 | restart_work); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 746 | struct spi_device *spi = priv->spi; |
| 747 | struct net_device *net = priv->net; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 748 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 749 | mutex_lock(&priv->mcp_lock); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 750 | if (priv->after_suspend) { |
| 751 | mdelay(10); |
| 752 | mcp251x_hw_reset(spi); |
| 753 | mcp251x_setup(net, priv, spi); |
| 754 | if (priv->after_suspend & AFTER_SUSPEND_RESTART) { |
| 755 | mcp251x_set_normal_mode(spi); |
| 756 | } else if (priv->after_suspend & AFTER_SUSPEND_UP) { |
| 757 | netif_device_attach(net); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 758 | mcp251x_clean(net); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 759 | mcp251x_set_normal_mode(spi); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 760 | netif_wake_queue(net); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 761 | } else { |
| 762 | mcp251x_hw_sleep(spi); |
| 763 | } |
| 764 | priv->after_suspend = 0; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 765 | priv->force_quit = 0; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 766 | } |
| 767 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 768 | if (priv->restart_tx) { |
| 769 | priv->restart_tx = 0; |
| 770 | mcp251x_write_reg(spi, TXBCTRL(0), 0); |
| 771 | mcp251x_clean(net); |
| 772 | netif_wake_queue(net); |
| 773 | mcp251x_error_skb(net, CAN_ERR_RESTARTED, 0); |
| 774 | } |
| 775 | mutex_unlock(&priv->mcp_lock); |
| 776 | } |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 777 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 778 | static irqreturn_t mcp251x_can_ist(int irq, void *dev_id) |
| 779 | { |
| 780 | struct mcp251x_priv *priv = dev_id; |
| 781 | struct spi_device *spi = priv->spi; |
| 782 | struct net_device *net = priv->net; |
| 783 | |
| 784 | mutex_lock(&priv->mcp_lock); |
| 785 | while (!priv->force_quit) { |
| 786 | enum can_state new_state; |
Sascha Hauer | f3a3ed3 | 2010-09-28 09:53:35 +0200 | [diff] [blame] | 787 | u8 intf, eflag; |
Marc Kleine-Budde | d3cd156 | 2010-09-28 10:18:34 +0200 | [diff] [blame] | 788 | u8 clear_intf = 0; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 789 | int can_id = 0, data1 = 0; |
| 790 | |
Sascha Hauer | f3a3ed3 | 2010-09-28 09:53:35 +0200 | [diff] [blame] | 791 | mcp251x_read_2regs(spi, CANINTF, &intf, &eflag); |
| 792 | |
Marc Kleine-Budde | d3cd156 | 2010-09-28 10:18:34 +0200 | [diff] [blame] | 793 | /* receive buffer 0 */ |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 794 | if (intf & CANINTF_RX0IF) { |
| 795 | mcp251x_hw_rx(spi, 0); |
Marc Kleine-Budde | 9c473fc | 2010-10-04 12:09:31 +0200 | [diff] [blame^] | 796 | /* |
| 797 | * Free one buffer ASAP |
| 798 | * (The MCP2515 does this automatically.) |
| 799 | */ |
| 800 | if (mcp251x_is_2510(spi)) |
| 801 | mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 802 | } |
| 803 | |
Marc Kleine-Budde | d3cd156 | 2010-09-28 10:18:34 +0200 | [diff] [blame] | 804 | /* receive buffer 1 */ |
| 805 | if (intf & CANINTF_RX1IF) { |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 806 | mcp251x_hw_rx(spi, 1); |
Marc Kleine-Budde | 9c473fc | 2010-10-04 12:09:31 +0200 | [diff] [blame^] | 807 | /* the MCP2515 does this automatically */ |
| 808 | if (mcp251x_is_2510(spi)) |
| 809 | clear_intf |= CANINTF_RX1IF; |
Marc Kleine-Budde | d3cd156 | 2010-09-28 10:18:34 +0200 | [diff] [blame] | 810 | } |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 811 | |
Marc Kleine-Budde | d3cd156 | 2010-09-28 10:18:34 +0200 | [diff] [blame] | 812 | /* any error or tx interrupt we need to clear? */ |
| 813 | if (intf & CANINTF_ERR_TX) |
| 814 | clear_intf |= intf & CANINTF_ERR_TX; |
| 815 | if (clear_intf) |
| 816 | mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 817 | |
Sascha Hauer | 7e15de3 | 2010-09-28 10:00:47 +0200 | [diff] [blame] | 818 | if (eflag) |
| 819 | mcp251x_write_bits(spi, EFLG, eflag, 0x00); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 820 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 821 | /* Update can state */ |
| 822 | if (eflag & EFLG_TXBO) { |
| 823 | new_state = CAN_STATE_BUS_OFF; |
| 824 | can_id |= CAN_ERR_BUSOFF; |
| 825 | } else if (eflag & EFLG_TXEP) { |
| 826 | new_state = CAN_STATE_ERROR_PASSIVE; |
| 827 | can_id |= CAN_ERR_CRTL; |
| 828 | data1 |= CAN_ERR_CRTL_TX_PASSIVE; |
| 829 | } else if (eflag & EFLG_RXEP) { |
| 830 | new_state = CAN_STATE_ERROR_PASSIVE; |
| 831 | can_id |= CAN_ERR_CRTL; |
| 832 | data1 |= CAN_ERR_CRTL_RX_PASSIVE; |
| 833 | } else if (eflag & EFLG_TXWAR) { |
| 834 | new_state = CAN_STATE_ERROR_WARNING; |
| 835 | can_id |= CAN_ERR_CRTL; |
| 836 | data1 |= CAN_ERR_CRTL_TX_WARNING; |
| 837 | } else if (eflag & EFLG_RXWAR) { |
| 838 | new_state = CAN_STATE_ERROR_WARNING; |
| 839 | can_id |= CAN_ERR_CRTL; |
| 840 | data1 |= CAN_ERR_CRTL_RX_WARNING; |
| 841 | } else { |
| 842 | new_state = CAN_STATE_ERROR_ACTIVE; |
| 843 | } |
| 844 | |
| 845 | /* Update can state statistics */ |
| 846 | switch (priv->can.state) { |
| 847 | case CAN_STATE_ERROR_ACTIVE: |
| 848 | if (new_state >= CAN_STATE_ERROR_WARNING && |
| 849 | new_state <= CAN_STATE_BUS_OFF) |
| 850 | priv->can.can_stats.error_warning++; |
| 851 | case CAN_STATE_ERROR_WARNING: /* fallthrough */ |
| 852 | if (new_state >= CAN_STATE_ERROR_PASSIVE && |
| 853 | new_state <= CAN_STATE_BUS_OFF) |
| 854 | priv->can.can_stats.error_passive++; |
| 855 | break; |
| 856 | default: |
| 857 | break; |
| 858 | } |
| 859 | priv->can.state = new_state; |
| 860 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 861 | if (intf & CANINTF_ERRIF) { |
| 862 | /* Handle overflow counters */ |
| 863 | if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) { |
Sascha Hauer | 711e4d6 | 2010-09-30 09:46:00 +0200 | [diff] [blame] | 864 | if (eflag & EFLG_RX0OVR) { |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 865 | net->stats.rx_over_errors++; |
Sascha Hauer | 711e4d6 | 2010-09-30 09:46:00 +0200 | [diff] [blame] | 866 | net->stats.rx_errors++; |
| 867 | } |
| 868 | if (eflag & EFLG_RX1OVR) { |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 869 | net->stats.rx_over_errors++; |
Sascha Hauer | 711e4d6 | 2010-09-30 09:46:00 +0200 | [diff] [blame] | 870 | net->stats.rx_errors++; |
| 871 | } |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 872 | can_id |= CAN_ERR_CRTL; |
| 873 | data1 |= CAN_ERR_CRTL_RX_OVERFLOW; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 874 | } |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 875 | mcp251x_error_skb(net, can_id, data1); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | if (priv->can.state == CAN_STATE_BUS_OFF) { |
| 879 | if (priv->can.restart_ms == 0) { |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 880 | priv->force_quit = 1; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 881 | can_bus_off(net); |
| 882 | mcp251x_hw_sleep(spi); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 883 | break; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 884 | } |
| 885 | } |
| 886 | |
| 887 | if (intf == 0) |
| 888 | break; |
| 889 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 890 | if (intf & (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF)) { |
| 891 | net->stats.tx_packets++; |
| 892 | net->stats.tx_bytes += priv->tx_len - 1; |
| 893 | if (priv->tx_len) { |
| 894 | can_get_echo_skb(net, 0); |
| 895 | priv->tx_len = 0; |
| 896 | } |
| 897 | netif_wake_queue(net); |
| 898 | } |
| 899 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 900 | } |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 901 | mutex_unlock(&priv->mcp_lock); |
| 902 | return IRQ_HANDLED; |
| 903 | } |
| 904 | |
| 905 | static int mcp251x_open(struct net_device *net) |
| 906 | { |
| 907 | struct mcp251x_priv *priv = netdev_priv(net); |
| 908 | struct spi_device *spi = priv->spi; |
| 909 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
| 910 | int ret; |
| 911 | |
| 912 | ret = open_candev(net); |
| 913 | if (ret) { |
| 914 | dev_err(&spi->dev, "unable to set initial baudrate!\n"); |
| 915 | return ret; |
| 916 | } |
| 917 | |
| 918 | mutex_lock(&priv->mcp_lock); |
| 919 | if (pdata->transceiver_enable) |
| 920 | pdata->transceiver_enable(1); |
| 921 | |
| 922 | priv->force_quit = 0; |
| 923 | priv->tx_skb = NULL; |
| 924 | priv->tx_len = 0; |
| 925 | |
| 926 | ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist, |
| 927 | IRQF_TRIGGER_FALLING, DEVICE_NAME, priv); |
| 928 | if (ret) { |
| 929 | dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq); |
| 930 | if (pdata->transceiver_enable) |
| 931 | pdata->transceiver_enable(0); |
| 932 | close_candev(net); |
| 933 | goto open_unlock; |
| 934 | } |
| 935 | |
| 936 | priv->wq = create_freezeable_workqueue("mcp251x_wq"); |
| 937 | INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler); |
| 938 | INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler); |
| 939 | |
| 940 | ret = mcp251x_hw_reset(spi); |
| 941 | if (ret) { |
| 942 | mcp251x_open_clean(net); |
| 943 | goto open_unlock; |
| 944 | } |
| 945 | ret = mcp251x_setup(net, priv, spi); |
| 946 | if (ret) { |
| 947 | mcp251x_open_clean(net); |
| 948 | goto open_unlock; |
| 949 | } |
| 950 | ret = mcp251x_set_normal_mode(spi); |
| 951 | if (ret) { |
| 952 | mcp251x_open_clean(net); |
| 953 | goto open_unlock; |
| 954 | } |
| 955 | netif_wake_queue(net); |
| 956 | |
| 957 | open_unlock: |
| 958 | mutex_unlock(&priv->mcp_lock); |
| 959 | return ret; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 960 | } |
| 961 | |
| 962 | static const struct net_device_ops mcp251x_netdev_ops = { |
| 963 | .ndo_open = mcp251x_open, |
| 964 | .ndo_stop = mcp251x_stop, |
| 965 | .ndo_start_xmit = mcp251x_hard_start_xmit, |
| 966 | }; |
| 967 | |
| 968 | static int __devinit mcp251x_can_probe(struct spi_device *spi) |
| 969 | { |
| 970 | struct net_device *net; |
| 971 | struct mcp251x_priv *priv; |
| 972 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
| 973 | int ret = -ENODEV; |
| 974 | |
| 975 | if (!pdata) |
| 976 | /* Platform data is required for osc freq */ |
| 977 | goto error_out; |
| 978 | |
| 979 | /* Allocate can/net device */ |
| 980 | net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX); |
| 981 | if (!net) { |
| 982 | ret = -ENOMEM; |
| 983 | goto error_alloc; |
| 984 | } |
| 985 | |
| 986 | net->netdev_ops = &mcp251x_netdev_ops; |
| 987 | net->flags |= IFF_ECHO; |
| 988 | |
| 989 | priv = netdev_priv(net); |
| 990 | priv->can.bittiming_const = &mcp251x_bittiming_const; |
| 991 | priv->can.do_set_mode = mcp251x_do_set_mode; |
| 992 | priv->can.clock.freq = pdata->oscillator_frequency / 2; |
Christian Pellegrin | ad72c34 | 2010-01-14 07:08:34 +0000 | [diff] [blame] | 993 | priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | |
| 994 | CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY; |
Marc Kleine-Budde | f1f8c6c | 2010-10-18 15:00:18 +0200 | [diff] [blame] | 995 | priv->model = spi_get_device_id(spi)->driver_data; |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 996 | priv->net = net; |
| 997 | dev_set_drvdata(&spi->dev, priv); |
| 998 | |
| 999 | priv->spi = spi; |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 1000 | mutex_init(&priv->mcp_lock); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1001 | |
| 1002 | /* If requested, allocate DMA buffers */ |
| 1003 | if (mcp251x_enable_dma) { |
| 1004 | spi->dev.coherent_dma_mask = ~0; |
| 1005 | |
| 1006 | /* |
| 1007 | * Minimum coherent DMA allocation is PAGE_SIZE, so allocate |
| 1008 | * that much and share it between Tx and Rx DMA buffers. |
| 1009 | */ |
| 1010 | priv->spi_tx_buf = dma_alloc_coherent(&spi->dev, |
| 1011 | PAGE_SIZE, |
| 1012 | &priv->spi_tx_dma, |
| 1013 | GFP_DMA); |
| 1014 | |
| 1015 | if (priv->spi_tx_buf) { |
| 1016 | priv->spi_rx_buf = (u8 *)(priv->spi_tx_buf + |
| 1017 | (PAGE_SIZE / 2)); |
| 1018 | priv->spi_rx_dma = (dma_addr_t)(priv->spi_tx_dma + |
| 1019 | (PAGE_SIZE / 2)); |
| 1020 | } else { |
| 1021 | /* Fall back to non-DMA */ |
| 1022 | mcp251x_enable_dma = 0; |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | /* Allocate non-DMA buffers */ |
| 1027 | if (!mcp251x_enable_dma) { |
| 1028 | priv->spi_tx_buf = kmalloc(SPI_TRANSFER_BUF_LEN, GFP_KERNEL); |
| 1029 | if (!priv->spi_tx_buf) { |
| 1030 | ret = -ENOMEM; |
| 1031 | goto error_tx_buf; |
| 1032 | } |
| 1033 | priv->spi_rx_buf = kmalloc(SPI_TRANSFER_BUF_LEN, GFP_KERNEL); |
Julia Lawall | ce739b4 | 2009-12-27 11:27:44 +0000 | [diff] [blame] | 1034 | if (!priv->spi_rx_buf) { |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1035 | ret = -ENOMEM; |
| 1036 | goto error_rx_buf; |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | if (pdata->power_enable) |
| 1041 | pdata->power_enable(1); |
| 1042 | |
| 1043 | /* Call out to platform specific setup */ |
| 1044 | if (pdata->board_specific_setup) |
| 1045 | pdata->board_specific_setup(spi); |
| 1046 | |
| 1047 | SET_NETDEV_DEV(net, &spi->dev); |
| 1048 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1049 | /* Configure the SPI bus */ |
| 1050 | spi->mode = SPI_MODE_0; |
| 1051 | spi->bits_per_word = 8; |
| 1052 | spi_setup(spi); |
| 1053 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 1054 | /* Here is OK to not lock the MCP, no one knows about it yet */ |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1055 | if (!mcp251x_hw_probe(spi)) { |
| 1056 | dev_info(&spi->dev, "Probe failed\n"); |
| 1057 | goto error_probe; |
| 1058 | } |
| 1059 | mcp251x_hw_sleep(spi); |
| 1060 | |
| 1061 | if (pdata->transceiver_enable) |
| 1062 | pdata->transceiver_enable(0); |
| 1063 | |
| 1064 | ret = register_candev(net); |
| 1065 | if (!ret) { |
| 1066 | dev_info(&spi->dev, "probed\n"); |
| 1067 | return ret; |
| 1068 | } |
| 1069 | error_probe: |
| 1070 | if (!mcp251x_enable_dma) |
| 1071 | kfree(priv->spi_rx_buf); |
| 1072 | error_rx_buf: |
| 1073 | if (!mcp251x_enable_dma) |
| 1074 | kfree(priv->spi_tx_buf); |
| 1075 | error_tx_buf: |
| 1076 | free_candev(net); |
| 1077 | if (mcp251x_enable_dma) |
| 1078 | dma_free_coherent(&spi->dev, PAGE_SIZE, |
| 1079 | priv->spi_tx_buf, priv->spi_tx_dma); |
| 1080 | error_alloc: |
| 1081 | if (pdata->power_enable) |
| 1082 | pdata->power_enable(0); |
| 1083 | dev_err(&spi->dev, "probe failed\n"); |
| 1084 | error_out: |
| 1085 | return ret; |
| 1086 | } |
| 1087 | |
| 1088 | static int __devexit mcp251x_can_remove(struct spi_device *spi) |
| 1089 | { |
| 1090 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
| 1091 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 1092 | struct net_device *net = priv->net; |
| 1093 | |
| 1094 | unregister_candev(net); |
| 1095 | free_candev(net); |
| 1096 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1097 | if (mcp251x_enable_dma) { |
| 1098 | dma_free_coherent(&spi->dev, PAGE_SIZE, |
| 1099 | priv->spi_tx_buf, priv->spi_tx_dma); |
| 1100 | } else { |
| 1101 | kfree(priv->spi_tx_buf); |
| 1102 | kfree(priv->spi_rx_buf); |
| 1103 | } |
| 1104 | |
| 1105 | if (pdata->power_enable) |
| 1106 | pdata->power_enable(0); |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | #ifdef CONFIG_PM |
| 1112 | static int mcp251x_can_suspend(struct spi_device *spi, pm_message_t state) |
| 1113 | { |
| 1114 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
| 1115 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 1116 | struct net_device *net = priv->net; |
| 1117 | |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 1118 | priv->force_quit = 1; |
| 1119 | disable_irq(spi->irq); |
| 1120 | /* |
| 1121 | * Note: at this point neither IST nor workqueues are running. |
| 1122 | * open/stop cannot be called anyway so locking is not needed |
| 1123 | */ |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1124 | if (netif_running(net)) { |
| 1125 | netif_device_detach(net); |
| 1126 | |
| 1127 | mcp251x_hw_sleep(spi); |
| 1128 | if (pdata->transceiver_enable) |
| 1129 | pdata->transceiver_enable(0); |
| 1130 | priv->after_suspend = AFTER_SUSPEND_UP; |
| 1131 | } else { |
| 1132 | priv->after_suspend = AFTER_SUSPEND_DOWN; |
| 1133 | } |
| 1134 | |
| 1135 | if (pdata->power_enable) { |
| 1136 | pdata->power_enable(0); |
| 1137 | priv->after_suspend |= AFTER_SUSPEND_POWER; |
| 1138 | } |
| 1139 | |
| 1140 | return 0; |
| 1141 | } |
| 1142 | |
| 1143 | static int mcp251x_can_resume(struct spi_device *spi) |
| 1144 | { |
| 1145 | struct mcp251x_platform_data *pdata = spi->dev.platform_data; |
| 1146 | struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev); |
| 1147 | |
| 1148 | if (priv->after_suspend & AFTER_SUSPEND_POWER) { |
| 1149 | pdata->power_enable(1); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 1150 | queue_work(priv->wq, &priv->restart_work); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1151 | } else { |
| 1152 | if (priv->after_suspend & AFTER_SUSPEND_UP) { |
| 1153 | if (pdata->transceiver_enable) |
| 1154 | pdata->transceiver_enable(1); |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 1155 | queue_work(priv->wq, &priv->restart_work); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1156 | } else { |
| 1157 | priv->after_suspend = 0; |
| 1158 | } |
| 1159 | } |
Christian Pellegrin | bf66f37 | 2010-02-03 07:39:54 +0000 | [diff] [blame] | 1160 | priv->force_quit = 0; |
| 1161 | enable_irq(spi->irq); |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1162 | return 0; |
| 1163 | } |
| 1164 | #else |
| 1165 | #define mcp251x_can_suspend NULL |
| 1166 | #define mcp251x_can_resume NULL |
| 1167 | #endif |
| 1168 | |
Marc Kleine-Budde | f1f8c6c | 2010-10-18 15:00:18 +0200 | [diff] [blame] | 1169 | static const struct spi_device_id mcp251x_id_table[] = { |
Marc Zyngier | e446630 | 2010-03-29 08:57:56 +0000 | [diff] [blame] | 1170 | { "mcp2510", CAN_MCP251X_MCP2510 }, |
| 1171 | { "mcp2515", CAN_MCP251X_MCP2515 }, |
| 1172 | { }, |
| 1173 | }; |
| 1174 | |
| 1175 | MODULE_DEVICE_TABLE(spi, mcp251x_id_table); |
| 1176 | |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1177 | static struct spi_driver mcp251x_can_driver = { |
| 1178 | .driver = { |
| 1179 | .name = DEVICE_NAME, |
| 1180 | .bus = &spi_bus_type, |
| 1181 | .owner = THIS_MODULE, |
| 1182 | }, |
| 1183 | |
Marc Zyngier | e446630 | 2010-03-29 08:57:56 +0000 | [diff] [blame] | 1184 | .id_table = mcp251x_id_table, |
Christian Pellegrin | e000016 | 2009-11-02 23:07:00 +0000 | [diff] [blame] | 1185 | .probe = mcp251x_can_probe, |
| 1186 | .remove = __devexit_p(mcp251x_can_remove), |
| 1187 | .suspend = mcp251x_can_suspend, |
| 1188 | .resume = mcp251x_can_resume, |
| 1189 | }; |
| 1190 | |
| 1191 | static int __init mcp251x_can_init(void) |
| 1192 | { |
| 1193 | return spi_register_driver(&mcp251x_can_driver); |
| 1194 | } |
| 1195 | |
| 1196 | static void __exit mcp251x_can_exit(void) |
| 1197 | { |
| 1198 | spi_unregister_driver(&mcp251x_can_driver); |
| 1199 | } |
| 1200 | |
| 1201 | module_init(mcp251x_can_init); |
| 1202 | module_exit(mcp251x_can_exit); |
| 1203 | |
| 1204 | MODULE_AUTHOR("Chris Elston <celston@katalix.com>, " |
| 1205 | "Christian Pellegrin <chripell@evolware.org>"); |
| 1206 | MODULE_DESCRIPTION("Microchip 251x CAN driver"); |
| 1207 | MODULE_LICENSE("GPL v2"); |