Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 1 | /* |
| 2 | * SuperH IrDA Driver |
| 3 | * |
| 4 | * Copyright (C) 2009 Renesas Solutions Corp. |
| 5 | * Kuninori Morimoto <morimoto.kuninori@renesas.com> |
| 6 | * |
| 7 | * Based on bfin_sir.c |
| 8 | * Copyright 2006-2009 Analog Devices Inc. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
Kuninori Morimoto | 86d0aff | 2011-08-10 23:26:09 +0000 | [diff] [blame] | 15 | #include <linux/io.h> |
| 16 | #include <linux/interrupt.h> |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/platform_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 20 | #include <net/irda/wrapper.h> |
| 21 | #include <net/irda/irda_device.h> |
| 22 | #include <asm/clock.h> |
| 23 | |
| 24 | #define DRIVER_NAME "sh_sir" |
| 25 | |
| 26 | #define RX_PHASE (1 << 0) |
| 27 | #define TX_PHASE (1 << 1) |
| 28 | #define TX_COMP_PHASE (1 << 2) /* tx complete */ |
| 29 | #define NONE_PHASE (1 << 31) |
| 30 | |
| 31 | #define IRIF_RINTCLR 0x0016 /* DMA rx interrupt source clear */ |
| 32 | #define IRIF_TINTCLR 0x0018 /* DMA tx interrupt source clear */ |
| 33 | #define IRIF_SIR0 0x0020 /* IrDA-SIR10 control */ |
| 34 | #define IRIF_SIR1 0x0022 /* IrDA-SIR10 baudrate error correction */ |
| 35 | #define IRIF_SIR2 0x0024 /* IrDA-SIR10 baudrate count */ |
| 36 | #define IRIF_SIR3 0x0026 /* IrDA-SIR10 status */ |
| 37 | #define IRIF_SIR_FRM 0x0028 /* Hardware frame processing set */ |
| 38 | #define IRIF_SIR_EOF 0x002A /* EOF value */ |
| 39 | #define IRIF_SIR_FLG 0x002C /* Flag clear */ |
| 40 | #define IRIF_UART_STS2 0x002E /* UART status 2 */ |
| 41 | #define IRIF_UART0 0x0030 /* UART control */ |
| 42 | #define IRIF_UART1 0x0032 /* UART status */ |
| 43 | #define IRIF_UART2 0x0034 /* UART mode */ |
| 44 | #define IRIF_UART3 0x0036 /* UART transmit data */ |
| 45 | #define IRIF_UART4 0x0038 /* UART receive data */ |
| 46 | #define IRIF_UART5 0x003A /* UART interrupt mask */ |
| 47 | #define IRIF_UART6 0x003C /* UART baud rate error correction */ |
| 48 | #define IRIF_UART7 0x003E /* UART baud rate count set */ |
| 49 | #define IRIF_CRC0 0x0040 /* CRC engine control */ |
| 50 | #define IRIF_CRC1 0x0042 /* CRC engine input data */ |
| 51 | #define IRIF_CRC2 0x0044 /* CRC engine calculation */ |
| 52 | #define IRIF_CRC3 0x0046 /* CRC engine output data 1 */ |
| 53 | #define IRIF_CRC4 0x0048 /* CRC engine output data 2 */ |
| 54 | |
| 55 | /* IRIF_SIR0 */ |
| 56 | #define IRTPW (1 << 1) /* transmit pulse width select */ |
| 57 | #define IRERRC (1 << 0) /* Clear receive pulse width error */ |
| 58 | |
| 59 | /* IRIF_SIR3 */ |
| 60 | #define IRERR (1 << 0) /* received pulse width Error */ |
| 61 | |
| 62 | /* IRIF_SIR_FRM */ |
| 63 | #define EOFD (1 << 9) /* EOF detection flag */ |
| 64 | #define FRER (1 << 8) /* Frame Error bit */ |
| 65 | #define FRP (1 << 0) /* Frame processing set */ |
| 66 | |
| 67 | /* IRIF_UART_STS2 */ |
| 68 | #define IRSME (1 << 6) /* Receive Sum Error flag */ |
| 69 | #define IROVE (1 << 5) /* Receive Overrun Error flag */ |
| 70 | #define IRFRE (1 << 4) /* Receive Framing Error flag */ |
| 71 | #define IRPRE (1 << 3) /* Receive Parity Error flag */ |
| 72 | |
| 73 | /* IRIF_UART0_*/ |
| 74 | #define TBEC (1 << 2) /* Transmit Data Clear */ |
| 75 | #define RIE (1 << 1) /* Receive Enable */ |
| 76 | #define TIE (1 << 0) /* Transmit Enable */ |
| 77 | |
| 78 | /* IRIF_UART1 */ |
| 79 | #define URSME (1 << 6) /* Receive Sum Error Flag */ |
| 80 | #define UROVE (1 << 5) /* Receive Overrun Error Flag */ |
| 81 | #define URFRE (1 << 4) /* Receive Framing Error Flag */ |
| 82 | #define URPRE (1 << 3) /* Receive Parity Error Flag */ |
| 83 | #define RBF (1 << 2) /* Receive Buffer Full Flag */ |
| 84 | #define TSBE (1 << 1) /* Transmit Shift Buffer Empty Flag */ |
| 85 | #define TBE (1 << 0) /* Transmit Buffer Empty flag */ |
| 86 | #define TBCOMP (TSBE | TBE) |
| 87 | |
| 88 | /* IRIF_UART5 */ |
| 89 | #define RSEIM (1 << 6) /* Receive Sum Error Flag IRQ Mask */ |
| 90 | #define RBFIM (1 << 2) /* Receive Buffer Full Flag IRQ Mask */ |
| 91 | #define TSBEIM (1 << 1) /* Transmit Shift Buffer Empty Flag IRQ Mask */ |
| 92 | #define TBEIM (1 << 0) /* Transmit Buffer Empty Flag IRQ Mask */ |
| 93 | #define RX_MASK (RSEIM | RBFIM) |
| 94 | |
| 95 | /* IRIF_CRC0 */ |
| 96 | #define CRC_RST (1 << 15) /* CRC Engine Reset */ |
| 97 | #define CRC_CT_MASK 0x0FFF |
| 98 | |
| 99 | /************************************************************************ |
| 100 | |
| 101 | |
| 102 | structure |
| 103 | |
| 104 | |
| 105 | ************************************************************************/ |
| 106 | struct sh_sir_self { |
| 107 | void __iomem *membase; |
| 108 | unsigned int irq; |
| 109 | struct clk *clk; |
| 110 | |
| 111 | struct net_device *ndev; |
| 112 | |
| 113 | struct irlap_cb *irlap; |
| 114 | struct qos_info qos; |
| 115 | |
| 116 | iobuff_t tx_buff; |
| 117 | iobuff_t rx_buff; |
| 118 | }; |
| 119 | |
| 120 | /************************************************************************ |
| 121 | |
| 122 | |
| 123 | common function |
| 124 | |
| 125 | |
| 126 | ************************************************************************/ |
| 127 | static void sh_sir_write(struct sh_sir_self *self, u32 offset, u16 data) |
| 128 | { |
| 129 | iowrite16(data, self->membase + offset); |
| 130 | } |
| 131 | |
| 132 | static u16 sh_sir_read(struct sh_sir_self *self, u32 offset) |
| 133 | { |
| 134 | return ioread16(self->membase + offset); |
| 135 | } |
| 136 | |
| 137 | static void sh_sir_update_bits(struct sh_sir_self *self, u32 offset, |
| 138 | u16 mask, u16 data) |
| 139 | { |
| 140 | u16 old, new; |
| 141 | |
| 142 | old = sh_sir_read(self, offset); |
| 143 | new = (old & ~mask) | data; |
| 144 | if (old != new) |
| 145 | sh_sir_write(self, offset, new); |
| 146 | } |
| 147 | |
| 148 | /************************************************************************ |
| 149 | |
| 150 | |
| 151 | CRC function |
| 152 | |
| 153 | |
| 154 | ************************************************************************/ |
| 155 | static void sh_sir_crc_reset(struct sh_sir_self *self) |
| 156 | { |
| 157 | sh_sir_write(self, IRIF_CRC0, CRC_RST); |
| 158 | } |
| 159 | |
| 160 | static void sh_sir_crc_add(struct sh_sir_self *self, u8 data) |
| 161 | { |
| 162 | sh_sir_write(self, IRIF_CRC1, (u16)data); |
| 163 | } |
| 164 | |
| 165 | static u16 sh_sir_crc_cnt(struct sh_sir_self *self) |
| 166 | { |
| 167 | return CRC_CT_MASK & sh_sir_read(self, IRIF_CRC0); |
| 168 | } |
| 169 | |
| 170 | static u16 sh_sir_crc_out(struct sh_sir_self *self) |
| 171 | { |
| 172 | return sh_sir_read(self, IRIF_CRC4); |
| 173 | } |
| 174 | |
| 175 | static int sh_sir_crc_init(struct sh_sir_self *self) |
| 176 | { |
| 177 | struct device *dev = &self->ndev->dev; |
| 178 | int ret = -EIO; |
| 179 | u16 val; |
| 180 | |
| 181 | sh_sir_crc_reset(self); |
| 182 | |
| 183 | sh_sir_crc_add(self, 0xCC); |
| 184 | sh_sir_crc_add(self, 0xF5); |
| 185 | sh_sir_crc_add(self, 0xF1); |
| 186 | sh_sir_crc_add(self, 0xA7); |
| 187 | |
| 188 | val = sh_sir_crc_cnt(self); |
| 189 | if (4 != val) { |
| 190 | dev_err(dev, "CRC count error %x\n", val); |
| 191 | goto crc_init_out; |
| 192 | } |
| 193 | |
| 194 | val = sh_sir_crc_out(self); |
| 195 | if (0x51DF != val) { |
| 196 | dev_err(dev, "CRC result error%x\n", val); |
| 197 | goto crc_init_out; |
| 198 | } |
| 199 | |
| 200 | ret = 0; |
| 201 | |
| 202 | crc_init_out: |
| 203 | |
| 204 | sh_sir_crc_reset(self); |
| 205 | return ret; |
| 206 | } |
| 207 | |
| 208 | /************************************************************************ |
| 209 | |
| 210 | |
| 211 | baud rate functions |
| 212 | |
| 213 | |
| 214 | ************************************************************************/ |
| 215 | #define SCLK_BASE 1843200 /* 1.8432MHz */ |
| 216 | |
| 217 | static u32 sh_sir_find_sclk(struct clk *irda_clk) |
| 218 | { |
| 219 | struct cpufreq_frequency_table *freq_table = irda_clk->freq_table; |
| 220 | struct clk *pclk = clk_get(NULL, "peripheral_clk"); |
| 221 | u32 limit, min = 0xffffffff, tmp; |
| 222 | int i, index = 0; |
| 223 | |
| 224 | limit = clk_get_rate(pclk); |
| 225 | clk_put(pclk); |
| 226 | |
| 227 | /* IrDA can not set over peripheral_clk */ |
| 228 | for (i = 0; |
| 229 | freq_table[i].frequency != CPUFREQ_TABLE_END; |
| 230 | i++) { |
| 231 | u32 freq = freq_table[i].frequency; |
| 232 | |
| 233 | if (freq == CPUFREQ_ENTRY_INVALID) |
| 234 | continue; |
| 235 | |
| 236 | /* IrDA should not over peripheral_clk */ |
| 237 | if (freq > limit) |
| 238 | continue; |
| 239 | |
| 240 | tmp = freq % SCLK_BASE; |
| 241 | if (tmp < min) { |
| 242 | min = tmp; |
| 243 | index = i; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | return freq_table[index].frequency; |
| 248 | } |
| 249 | |
| 250 | #define ERR_ROUNDING(a) ((a + 5000) / 10000) |
| 251 | static int sh_sir_set_baudrate(struct sh_sir_self *self, u32 baudrate) |
| 252 | { |
| 253 | struct clk *clk; |
| 254 | struct device *dev = &self->ndev->dev; |
| 255 | u32 rate; |
| 256 | u16 uabca, uabc; |
| 257 | u16 irbca, irbc; |
| 258 | u32 min, rerr, tmp; |
| 259 | int i; |
| 260 | |
| 261 | /* Baud Rate Error Correction x 10000 */ |
| 262 | u32 rate_err_array[] = { |
Nicolas Kaiser | ddab1a3 | 2010-11-18 14:24:02 +0000 | [diff] [blame] | 263 | 0, 625, 1250, 1875, |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 264 | 2500, 3125, 3750, 4375, |
| 265 | 5000, 5625, 6250, 6875, |
| 266 | 7500, 8125, 8750, 9375, |
| 267 | }; |
| 268 | |
| 269 | /* |
| 270 | * FIXME |
| 271 | * |
| 272 | * it support 9600 only now |
| 273 | */ |
| 274 | switch (baudrate) { |
| 275 | case 9600: |
| 276 | break; |
| 277 | default: |
| 278 | dev_err(dev, "un-supported baudrate %d\n", baudrate); |
| 279 | return -EIO; |
| 280 | } |
| 281 | |
| 282 | clk = clk_get(NULL, "irda_clk"); |
Wei Yongjun | dc9c975 | 2012-09-20 21:13:55 +0000 | [diff] [blame] | 283 | if (IS_ERR(clk)) { |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 284 | dev_err(dev, "can not get irda_clk\n"); |
| 285 | return -EIO; |
| 286 | } |
| 287 | |
| 288 | clk_set_rate(clk, sh_sir_find_sclk(clk)); |
| 289 | rate = clk_get_rate(clk); |
| 290 | clk_put(clk); |
| 291 | |
| 292 | dev_dbg(dev, "selected sclk = %d\n", rate); |
| 293 | |
| 294 | /* |
| 295 | * CALCULATION |
| 296 | * |
| 297 | * 1843200 = system rate / (irbca + (irbc + 1)) |
| 298 | */ |
| 299 | |
| 300 | irbc = rate / SCLK_BASE; |
| 301 | |
| 302 | tmp = rate - (SCLK_BASE * irbc); |
| 303 | tmp *= 10000; |
| 304 | |
| 305 | rerr = tmp / SCLK_BASE; |
| 306 | |
| 307 | min = 0xffffffff; |
| 308 | irbca = 0; |
| 309 | for (i = 0; i < ARRAY_SIZE(rate_err_array); i++) { |
| 310 | tmp = abs(rate_err_array[i] - rerr); |
| 311 | if (min > tmp) { |
| 312 | min = tmp; |
| 313 | irbca = i; |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | tmp = rate / (irbc + ERR_ROUNDING(rate_err_array[irbca])); |
| 318 | if ((SCLK_BASE / 100) < abs(tmp - SCLK_BASE)) |
| 319 | dev_warn(dev, "IrDA freq error margin over %d\n", tmp); |
| 320 | |
| 321 | dev_dbg(dev, "target = %d, result = %d, infrared = %d.%d\n", |
| 322 | SCLK_BASE, tmp, irbc, rate_err_array[irbca]); |
| 323 | |
| 324 | irbca = (irbca & 0xF) << 4; |
| 325 | irbc = (irbc - 1) & 0xF; |
| 326 | |
| 327 | if (!irbc) { |
| 328 | dev_err(dev, "sh_sir can not set 0 in IRIF_SIR2\n"); |
| 329 | return -EIO; |
| 330 | } |
| 331 | |
| 332 | sh_sir_write(self, IRIF_SIR0, IRTPW | IRERRC); |
| 333 | sh_sir_write(self, IRIF_SIR1, irbca); |
| 334 | sh_sir_write(self, IRIF_SIR2, irbc); |
| 335 | |
| 336 | /* |
| 337 | * CALCULATION |
| 338 | * |
| 339 | * BaudRate[bps] = system rate / (uabca + (uabc + 1) x 16) |
| 340 | */ |
| 341 | |
| 342 | uabc = rate / baudrate; |
| 343 | uabc = (uabc / 16) - 1; |
| 344 | uabc = (uabc + 1) * 16; |
| 345 | |
| 346 | tmp = rate - (uabc * baudrate); |
| 347 | tmp *= 10000; |
| 348 | |
| 349 | rerr = tmp / baudrate; |
| 350 | |
| 351 | min = 0xffffffff; |
| 352 | uabca = 0; |
| 353 | for (i = 0; i < ARRAY_SIZE(rate_err_array); i++) { |
| 354 | tmp = abs(rate_err_array[i] - rerr); |
| 355 | if (min > tmp) { |
| 356 | min = tmp; |
| 357 | uabca = i; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | tmp = rate / (uabc + ERR_ROUNDING(rate_err_array[uabca])); |
| 362 | if ((baudrate / 100) < abs(tmp - baudrate)) |
| 363 | dev_warn(dev, "UART freq error margin over %d\n", tmp); |
| 364 | |
| 365 | dev_dbg(dev, "target = %d, result = %d, uart = %d.%d\n", |
| 366 | baudrate, tmp, |
| 367 | uabc, rate_err_array[uabca]); |
| 368 | |
| 369 | uabca = (uabca & 0xF) << 4; |
| 370 | uabc = (uabc / 16) - 1; |
| 371 | |
| 372 | sh_sir_write(self, IRIF_UART6, uabca); |
| 373 | sh_sir_write(self, IRIF_UART7, uabc); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | /************************************************************************ |
| 379 | |
| 380 | |
| 381 | iobuf function |
| 382 | |
| 383 | |
| 384 | ************************************************************************/ |
| 385 | static int __sh_sir_init_iobuf(iobuff_t *io, int size) |
| 386 | { |
| 387 | io->head = kmalloc(size, GFP_KERNEL); |
| 388 | if (!io->head) |
| 389 | return -ENOMEM; |
| 390 | |
| 391 | io->truesize = size; |
| 392 | io->in_frame = FALSE; |
| 393 | io->state = OUTSIDE_FRAME; |
| 394 | io->data = io->head; |
| 395 | |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | static void sh_sir_remove_iobuf(struct sh_sir_self *self) |
| 400 | { |
| 401 | kfree(self->rx_buff.head); |
| 402 | kfree(self->tx_buff.head); |
| 403 | |
| 404 | self->rx_buff.head = NULL; |
| 405 | self->tx_buff.head = NULL; |
| 406 | } |
| 407 | |
| 408 | static int sh_sir_init_iobuf(struct sh_sir_self *self, int rxsize, int txsize) |
| 409 | { |
| 410 | int err = -ENOMEM; |
| 411 | |
| 412 | if (self->rx_buff.head || |
| 413 | self->tx_buff.head) { |
| 414 | dev_err(&self->ndev->dev, "iobuff has already existed."); |
| 415 | return err; |
| 416 | } |
| 417 | |
| 418 | err = __sh_sir_init_iobuf(&self->rx_buff, rxsize); |
| 419 | if (err) |
| 420 | goto iobuf_err; |
| 421 | |
| 422 | err = __sh_sir_init_iobuf(&self->tx_buff, txsize); |
| 423 | |
| 424 | iobuf_err: |
| 425 | if (err) |
| 426 | sh_sir_remove_iobuf(self); |
| 427 | |
| 428 | return err; |
| 429 | } |
| 430 | |
| 431 | /************************************************************************ |
| 432 | |
| 433 | |
| 434 | status function |
| 435 | |
| 436 | |
| 437 | ************************************************************************/ |
| 438 | static void sh_sir_clear_all_err(struct sh_sir_self *self) |
| 439 | { |
| 440 | /* Clear error flag for receive pulse width */ |
| 441 | sh_sir_update_bits(self, IRIF_SIR0, IRERRC, IRERRC); |
| 442 | |
| 443 | /* Clear frame / EOF error flag */ |
| 444 | sh_sir_write(self, IRIF_SIR_FLG, 0xffff); |
| 445 | |
| 446 | /* Clear all status error */ |
| 447 | sh_sir_write(self, IRIF_UART_STS2, 0); |
| 448 | } |
| 449 | |
| 450 | static void sh_sir_set_phase(struct sh_sir_self *self, int phase) |
| 451 | { |
| 452 | u16 uart5 = 0; |
| 453 | u16 uart0 = 0; |
| 454 | |
| 455 | switch (phase) { |
| 456 | case TX_PHASE: |
| 457 | uart5 = TBEIM; |
| 458 | uart0 = TBEC | TIE; |
| 459 | break; |
| 460 | case TX_COMP_PHASE: |
| 461 | uart5 = TSBEIM; |
| 462 | uart0 = TIE; |
| 463 | break; |
| 464 | case RX_PHASE: |
| 465 | uart5 = RX_MASK; |
| 466 | uart0 = RIE; |
| 467 | break; |
| 468 | default: |
| 469 | break; |
| 470 | } |
| 471 | |
| 472 | sh_sir_write(self, IRIF_UART5, uart5); |
| 473 | sh_sir_write(self, IRIF_UART0, uart0); |
| 474 | } |
| 475 | |
| 476 | static int sh_sir_is_which_phase(struct sh_sir_self *self) |
| 477 | { |
| 478 | u16 val = sh_sir_read(self, IRIF_UART5); |
| 479 | |
| 480 | if (val & TBEIM) |
| 481 | return TX_PHASE; |
| 482 | |
| 483 | if (val & TSBEIM) |
| 484 | return TX_COMP_PHASE; |
| 485 | |
| 486 | if (val & RX_MASK) |
| 487 | return RX_PHASE; |
| 488 | |
| 489 | return NONE_PHASE; |
| 490 | } |
| 491 | |
| 492 | static void sh_sir_tx(struct sh_sir_self *self, int phase) |
| 493 | { |
| 494 | switch (phase) { |
| 495 | case TX_PHASE: |
| 496 | if (0 >= self->tx_buff.len) { |
| 497 | sh_sir_set_phase(self, TX_COMP_PHASE); |
| 498 | } else { |
| 499 | sh_sir_write(self, IRIF_UART3, self->tx_buff.data[0]); |
| 500 | self->tx_buff.len--; |
| 501 | self->tx_buff.data++; |
| 502 | } |
| 503 | break; |
| 504 | case TX_COMP_PHASE: |
| 505 | sh_sir_set_phase(self, RX_PHASE); |
| 506 | netif_wake_queue(self->ndev); |
| 507 | break; |
| 508 | default: |
| 509 | dev_err(&self->ndev->dev, "should not happen\n"); |
| 510 | break; |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | static int sh_sir_read_data(struct sh_sir_self *self) |
| 515 | { |
Kuninori Morimoto | 2eed798 | 2011-08-10 23:26:37 +0000 | [diff] [blame] | 516 | u16 val = 0; |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 517 | int timeout = 1024; |
| 518 | |
| 519 | while (timeout--) { |
| 520 | val = sh_sir_read(self, IRIF_UART1); |
| 521 | |
| 522 | /* data get */ |
| 523 | if (val & RBF) { |
| 524 | if (val & (URSME | UROVE | URFRE | URPRE)) |
| 525 | break; |
| 526 | |
| 527 | return (int)sh_sir_read(self, IRIF_UART4); |
| 528 | } |
| 529 | |
| 530 | udelay(1); |
| 531 | } |
| 532 | |
| 533 | dev_err(&self->ndev->dev, "UART1 %04x : STATUS %04x\n", |
| 534 | val, sh_sir_read(self, IRIF_UART_STS2)); |
| 535 | |
| 536 | /* read data register for clear error */ |
| 537 | sh_sir_read(self, IRIF_UART4); |
| 538 | |
| 539 | return -1; |
| 540 | } |
| 541 | |
| 542 | static void sh_sir_rx(struct sh_sir_self *self) |
| 543 | { |
| 544 | int timeout = 1024; |
| 545 | int data; |
| 546 | |
| 547 | while (timeout--) { |
| 548 | data = sh_sir_read_data(self); |
| 549 | if (data < 0) |
| 550 | break; |
| 551 | |
| 552 | async_unwrap_char(self->ndev, &self->ndev->stats, |
| 553 | &self->rx_buff, (u8)data); |
| 554 | self->ndev->last_rx = jiffies; |
| 555 | |
| 556 | if (EOFD & sh_sir_read(self, IRIF_SIR_FRM)) |
| 557 | continue; |
| 558 | |
| 559 | break; |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | static irqreturn_t sh_sir_irq(int irq, void *dev_id) |
| 564 | { |
| 565 | struct sh_sir_self *self = dev_id; |
| 566 | struct device *dev = &self->ndev->dev; |
| 567 | int phase = sh_sir_is_which_phase(self); |
| 568 | |
| 569 | switch (phase) { |
| 570 | case TX_COMP_PHASE: |
| 571 | case TX_PHASE: |
| 572 | sh_sir_tx(self, phase); |
| 573 | break; |
| 574 | case RX_PHASE: |
| 575 | if (sh_sir_read(self, IRIF_SIR3)) |
| 576 | dev_err(dev, "rcv pulse width error occurred\n"); |
| 577 | |
| 578 | sh_sir_rx(self); |
| 579 | sh_sir_clear_all_err(self); |
| 580 | break; |
| 581 | default: |
| 582 | dev_err(dev, "unknown interrupt\n"); |
| 583 | } |
| 584 | |
| 585 | return IRQ_HANDLED; |
| 586 | } |
| 587 | |
| 588 | /************************************************************************ |
| 589 | |
| 590 | |
| 591 | net_device_ops function |
| 592 | |
| 593 | |
| 594 | ************************************************************************/ |
| 595 | static int sh_sir_hard_xmit(struct sk_buff *skb, struct net_device *ndev) |
| 596 | { |
| 597 | struct sh_sir_self *self = netdev_priv(ndev); |
| 598 | int speed = irda_get_next_speed(skb); |
| 599 | |
| 600 | if ((0 < speed) && |
| 601 | (9600 != speed)) { |
| 602 | dev_err(&ndev->dev, "support 9600 only (%d)\n", speed); |
| 603 | return -EIO; |
| 604 | } |
| 605 | |
| 606 | netif_stop_queue(ndev); |
| 607 | |
| 608 | self->tx_buff.data = self->tx_buff.head; |
| 609 | self->tx_buff.len = 0; |
| 610 | if (skb->len) |
| 611 | self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, |
| 612 | self->tx_buff.truesize); |
| 613 | |
| 614 | sh_sir_set_phase(self, TX_PHASE); |
| 615 | dev_kfree_skb(skb); |
| 616 | |
| 617 | return 0; |
| 618 | } |
| 619 | |
| 620 | static int sh_sir_ioctl(struct net_device *ndev, struct ifreq *ifreq, int cmd) |
| 621 | { |
| 622 | /* |
| 623 | * FIXME |
| 624 | * |
| 625 | * This function is needed for irda framework. |
| 626 | * But nothing to do now |
| 627 | */ |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | static struct net_device_stats *sh_sir_stats(struct net_device *ndev) |
| 632 | { |
| 633 | struct sh_sir_self *self = netdev_priv(ndev); |
| 634 | |
| 635 | return &self->ndev->stats; |
| 636 | } |
| 637 | |
| 638 | static int sh_sir_open(struct net_device *ndev) |
| 639 | { |
| 640 | struct sh_sir_self *self = netdev_priv(ndev); |
| 641 | int err; |
| 642 | |
| 643 | clk_enable(self->clk); |
| 644 | err = sh_sir_crc_init(self); |
| 645 | if (err) |
| 646 | goto open_err; |
| 647 | |
| 648 | sh_sir_set_baudrate(self, 9600); |
| 649 | |
| 650 | self->irlap = irlap_open(ndev, &self->qos, DRIVER_NAME); |
Kuninori Morimoto | ba5d47c | 2010-04-05 18:43:09 +0000 | [diff] [blame] | 651 | if (!self->irlap) { |
| 652 | err = -ENODEV; |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 653 | goto open_err; |
Kuninori Morimoto | ba5d47c | 2010-04-05 18:43:09 +0000 | [diff] [blame] | 654 | } |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 655 | |
| 656 | /* |
| 657 | * Now enable the interrupt then start the queue |
| 658 | */ |
| 659 | sh_sir_update_bits(self, IRIF_SIR_FRM, FRP, FRP); |
| 660 | sh_sir_read(self, IRIF_UART1); /* flag clear */ |
| 661 | sh_sir_read(self, IRIF_UART4); /* flag clear */ |
| 662 | sh_sir_set_phase(self, RX_PHASE); |
| 663 | |
| 664 | netif_start_queue(ndev); |
| 665 | |
| 666 | dev_info(&self->ndev->dev, "opened\n"); |
| 667 | |
| 668 | return 0; |
| 669 | |
| 670 | open_err: |
| 671 | clk_disable(self->clk); |
| 672 | |
| 673 | return err; |
| 674 | } |
| 675 | |
| 676 | static int sh_sir_stop(struct net_device *ndev) |
| 677 | { |
| 678 | struct sh_sir_self *self = netdev_priv(ndev); |
| 679 | |
| 680 | /* Stop IrLAP */ |
| 681 | if (self->irlap) { |
| 682 | irlap_close(self->irlap); |
| 683 | self->irlap = NULL; |
| 684 | } |
| 685 | |
| 686 | netif_stop_queue(ndev); |
| 687 | |
Masanari Iida | fd9071e | 2012-04-13 04:33:20 +0000 | [diff] [blame] | 688 | dev_info(&ndev->dev, "stopped\n"); |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 689 | |
| 690 | return 0; |
| 691 | } |
| 692 | |
| 693 | static const struct net_device_ops sh_sir_ndo = { |
| 694 | .ndo_open = sh_sir_open, |
| 695 | .ndo_stop = sh_sir_stop, |
| 696 | .ndo_start_xmit = sh_sir_hard_xmit, |
| 697 | .ndo_do_ioctl = sh_sir_ioctl, |
| 698 | .ndo_get_stats = sh_sir_stats, |
| 699 | }; |
| 700 | |
| 701 | /************************************************************************ |
| 702 | |
| 703 | |
| 704 | platform_driver function |
| 705 | |
| 706 | |
| 707 | ************************************************************************/ |
Bill Pemberton | 45ac936 | 2012-12-03 09:24:13 -0500 | [diff] [blame] | 708 | static int sh_sir_probe(struct platform_device *pdev) |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 709 | { |
| 710 | struct net_device *ndev; |
| 711 | struct sh_sir_self *self; |
| 712 | struct resource *res; |
| 713 | char clk_name[8]; |
Kulikov Vasiliy | 9f27fb8 | 2010-07-15 08:45:29 +0000 | [diff] [blame] | 714 | int irq; |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 715 | int err = -ENOMEM; |
| 716 | |
| 717 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 718 | irq = platform_get_irq(pdev, 0); |
| 719 | if (!res || irq < 0) { |
| 720 | dev_err(&pdev->dev, "Not enough platform resources.\n"); |
| 721 | goto exit; |
| 722 | } |
| 723 | |
| 724 | ndev = alloc_irdadev(sizeof(*self)); |
| 725 | if (!ndev) |
| 726 | goto exit; |
| 727 | |
Kuninori Morimoto | 33d8212c | 2010-04-05 18:43:18 +0000 | [diff] [blame] | 728 | self = netdev_priv(ndev); |
| 729 | self->membase = ioremap_nocache(res->start, resource_size(res)); |
| 730 | if (!self->membase) { |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 731 | err = -ENXIO; |
| 732 | dev_err(&pdev->dev, "Unable to ioremap.\n"); |
| 733 | goto err_mem_1; |
| 734 | } |
| 735 | |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 736 | err = sh_sir_init_iobuf(self, IRDA_SKB_MAX_MTU, IRDA_SIR_MAX_FRAME); |
| 737 | if (err) |
| 738 | goto err_mem_2; |
| 739 | |
| 740 | snprintf(clk_name, sizeof(clk_name), "irda%d", pdev->id); |
| 741 | self->clk = clk_get(&pdev->dev, clk_name); |
| 742 | if (IS_ERR(self->clk)) { |
| 743 | dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name); |
Peter Senna Tschudin | 1483454 | 2012-10-05 12:10:49 +0000 | [diff] [blame] | 744 | err = -ENODEV; |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 745 | goto err_mem_3; |
| 746 | } |
| 747 | |
| 748 | irda_init_max_qos_capabilies(&self->qos); |
| 749 | |
| 750 | ndev->netdev_ops = &sh_sir_ndo; |
| 751 | ndev->irq = irq; |
| 752 | |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 753 | self->ndev = ndev; |
| 754 | self->qos.baud_rate.bits &= IR_9600; /* FIXME */ |
| 755 | self->qos.min_turn_time.bits = 1; /* 10 ms or more */ |
| 756 | |
| 757 | irda_qos_bits_to_value(&self->qos); |
| 758 | |
| 759 | err = register_netdev(ndev); |
| 760 | if (err) |
| 761 | goto err_mem_4; |
| 762 | |
| 763 | platform_set_drvdata(pdev, ndev); |
Peter Senna Tschudin | 1483454 | 2012-10-05 12:10:49 +0000 | [diff] [blame] | 764 | err = request_irq(irq, sh_sir_irq, IRQF_DISABLED, "sh_sir", self); |
| 765 | if (err) { |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 766 | dev_warn(&pdev->dev, "Unable to attach sh_sir interrupt\n"); |
| 767 | goto err_mem_4; |
| 768 | } |
| 769 | |
| 770 | dev_info(&pdev->dev, "SuperH IrDA probed\n"); |
| 771 | |
| 772 | goto exit; |
| 773 | |
| 774 | err_mem_4: |
| 775 | clk_put(self->clk); |
| 776 | err_mem_3: |
| 777 | sh_sir_remove_iobuf(self); |
| 778 | err_mem_2: |
| 779 | iounmap(self->membase); |
| 780 | err_mem_1: |
| 781 | free_netdev(ndev); |
| 782 | exit: |
| 783 | return err; |
| 784 | } |
| 785 | |
Bill Pemberton | 45ac936 | 2012-12-03 09:24:13 -0500 | [diff] [blame] | 786 | static int sh_sir_remove(struct platform_device *pdev) |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 787 | { |
| 788 | struct net_device *ndev = platform_get_drvdata(pdev); |
| 789 | struct sh_sir_self *self = netdev_priv(ndev); |
| 790 | |
| 791 | if (!self) |
| 792 | return 0; |
| 793 | |
| 794 | unregister_netdev(ndev); |
| 795 | clk_put(self->clk); |
| 796 | sh_sir_remove_iobuf(self); |
| 797 | iounmap(self->membase); |
| 798 | free_netdev(ndev); |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 799 | |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | static struct platform_driver sh_sir_driver = { |
| 804 | .probe = sh_sir_probe, |
Bill Pemberton | 45ac936 | 2012-12-03 09:24:13 -0500 | [diff] [blame] | 805 | .remove = sh_sir_remove, |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 806 | .driver = { |
| 807 | .name = DRIVER_NAME, |
| 808 | }, |
| 809 | }; |
| 810 | |
Axel Lin | 8b7ff20 | 2011-11-27 20:29:11 -0500 | [diff] [blame] | 811 | module_platform_driver(sh_sir_driver); |
Kuninori Morimoto | 2a6ace1 | 2010-02-02 07:47:56 -0800 | [diff] [blame] | 812 | |
| 813 | MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>"); |
| 814 | MODULE_DESCRIPTION("SuperH IrDA driver"); |
| 815 | MODULE_LICENSE("GPL"); |