1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * SuperH MSIOF SPI Controller Interface 4 * 5 * Copyright (c) 2009 Magnus Damm 6 * Copyright (C) 2014 Renesas Electronics Corporation 7 * Copyright (C) 2014-2017 Glider bvba 8 */ 9 10 #include <linux/bitmap.h> 11 #include <linux/clk.h> 12 #include <linux/completion.h> 13 #include <linux/delay.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/dmaengine.h> 16 #include <linux/err.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/iopoll.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/platform_device.h> 25 #include <linux/pm_runtime.h> 26 #include <linux/sh_dma.h> 27 28 #include <linux/spi/sh_msiof.h> 29 #include <linux/spi/spi.h> 30 31 #include <asm/unaligned.h> 32 33 struct sh_msiof_chipdata { 34 u32 bits_per_word_mask; 35 u16 tx_fifo_size; 36 u16 rx_fifo_size; 37 u16 ctlr_flags; 38 u16 min_div_pow; 39 }; 40 41 struct sh_msiof_spi_priv { 42 struct spi_controller *ctlr; 43 void __iomem *mapbase; 44 struct clk *clk; 45 struct platform_device *pdev; 46 struct sh_msiof_spi_info *info; 47 struct completion done; 48 struct completion done_txdma; 49 unsigned int tx_fifo_size; 50 unsigned int rx_fifo_size; 51 unsigned int min_div_pow; 52 void *tx_dma_page; 53 void *rx_dma_page; 54 dma_addr_t tx_dma_addr; 55 dma_addr_t rx_dma_addr; 56 bool native_cs_inited; 57 bool native_cs_high; 58 bool slave_aborted; 59 }; 60 61 #define MAX_SS 3 /* Maximum number of native chip selects */ 62 63 #define SITMDR1 0x00 /* Transmit Mode Register 1 */ 64 #define SITMDR2 0x04 /* Transmit Mode Register 2 */ 65 #define SITMDR3 0x08 /* Transmit Mode Register 3 */ 66 #define SIRMDR1 0x10 /* Receive Mode Register 1 */ 67 #define SIRMDR2 0x14 /* Receive Mode Register 2 */ 68 #define SIRMDR3 0x18 /* Receive Mode Register 3 */ 69 #define SITSCR 0x20 /* Transmit Clock Select Register */ 70 #define SIRSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */ 71 #define SICTR 0x28 /* Control Register */ 72 #define SIFCTR 0x30 /* FIFO Control Register */ 73 #define SISTR 0x40 /* Status Register */ 74 #define SIIER 0x44 /* Interrupt Enable Register */ 75 #define SITDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */ 76 #define SITDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */ 77 #define SITFDR 0x50 /* Transmit FIFO Data Register */ 78 #define SIRDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */ 79 #define SIRDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */ 80 #define SIRFDR 0x60 /* Receive FIFO Data Register */ 81 82 /* SITMDR1 and SIRMDR1 */ 83 #define SIMDR1_TRMD BIT(31) /* Transfer Mode (1 = Master mode) */ 84 #define SIMDR1_SYNCMD_MASK GENMASK(29, 28) /* SYNC Mode */ 85 #define SIMDR1_SYNCMD_SPI (2 << 28) /* Level mode/SPI */ 86 #define SIMDR1_SYNCMD_LR (3 << 28) /* L/R mode */ 87 #define SIMDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */ 88 #define SIMDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */ 89 #define SIMDR1_DTDL_SHIFT 20 /* Data Pin Bit Delay for MSIOF_SYNC */ 90 #define SIMDR1_SYNCDL_SHIFT 16 /* Frame Sync Signal Timing Delay */ 91 #define SIMDR1_FLD_MASK GENMASK(3, 2) /* Frame Sync Signal Interval (0-3) */ 92 #define SIMDR1_FLD_SHIFT 2 93 #define SIMDR1_XXSTP BIT(0) /* Transmission/Reception Stop on FIFO */ 94 /* SITMDR1 */ 95 #define SITMDR1_PCON BIT(30) /* Transfer Signal Connection */ 96 #define SITMDR1_SYNCCH_MASK GENMASK(27, 26) /* Sync Signal Channel Select */ 97 #define SITMDR1_SYNCCH_SHIFT 26 /* 0=MSIOF_SYNC, 1=MSIOF_SS1, 2=MSIOF_SS2 */ 98 99 /* SITMDR2 and SIRMDR2 */ 100 #define SIMDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */ 101 #define SIMDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */ 102 #define SIMDR2_GRPMASK1 BIT(0) /* Group Output Mask 1 (SH, A1) */ 103 104 /* SITSCR and SIRSCR */ 105 #define SISCR_BRPS_MASK GENMASK(12, 8) /* Prescaler Setting (1-32) */ 106 #define SISCR_BRPS(i) (((i) - 1) << 8) 107 #define SISCR_BRDV_MASK GENMASK(2, 0) /* Baud Rate Generator's Division Ratio */ 108 #define SISCR_BRDV_DIV_2 0 109 #define SISCR_BRDV_DIV_4 1 110 #define SISCR_BRDV_DIV_8 2 111 #define SISCR_BRDV_DIV_16 3 112 #define SISCR_BRDV_DIV_32 4 113 #define SISCR_BRDV_DIV_1 7 114 115 /* SICTR */ 116 #define SICTR_TSCKIZ_MASK GENMASK(31, 30) /* Transmit Clock I/O Polarity Select */ 117 #define SICTR_TSCKIZ_SCK BIT(31) /* Disable SCK when TX disabled */ 118 #define SICTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */ 119 #define SICTR_RSCKIZ_MASK GENMASK(29, 28) /* Receive Clock Polarity Select */ 120 #define SICTR_RSCKIZ_SCK BIT(29) /* Must match CTR_TSCKIZ_SCK */ 121 #define SICTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */ 122 #define SICTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */ 123 #define SICTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */ 124 #define SICTR_TXDIZ_MASK GENMASK(23, 22) /* Pin Output When TX is Disabled */ 125 #define SICTR_TXDIZ_LOW (0 << 22) /* 0 */ 126 #define SICTR_TXDIZ_HIGH (1 << 22) /* 1 */ 127 #define SICTR_TXDIZ_HIZ (2 << 22) /* High-impedance */ 128 #define SICTR_TSCKE BIT(15) /* Transmit Serial Clock Output Enable */ 129 #define SICTR_TFSE BIT(14) /* Transmit Frame Sync Signal Output Enable */ 130 #define SICTR_TXE BIT(9) /* Transmit Enable */ 131 #define SICTR_RXE BIT(8) /* Receive Enable */ 132 #define SICTR_TXRST BIT(1) /* Transmit Reset */ 133 #define SICTR_RXRST BIT(0) /* Receive Reset */ 134 135 /* SIFCTR */ 136 #define SIFCTR_TFWM_MASK GENMASK(31, 29) /* Transmit FIFO Watermark */ 137 #define SIFCTR_TFWM_64 (0 << 29) /* Transfer Request when 64 empty stages */ 138 #define SIFCTR_TFWM_32 (1 << 29) /* Transfer Request when 32 empty stages */ 139 #define SIFCTR_TFWM_24 (2 << 29) /* Transfer Request when 24 empty stages */ 140 #define SIFCTR_TFWM_16 (3 << 29) /* Transfer Request when 16 empty stages */ 141 #define SIFCTR_TFWM_12 (4 << 29) /* Transfer Request when 12 empty stages */ 142 #define SIFCTR_TFWM_8 (5 << 29) /* Transfer Request when 8 empty stages */ 143 #define SIFCTR_TFWM_4 (6 << 29) /* Transfer Request when 4 empty stages */ 144 #define SIFCTR_TFWM_1 (7 << 29) /* Transfer Request when 1 empty stage */ 145 #define SIFCTR_TFUA_MASK GENMASK(26, 20) /* Transmit FIFO Usable Area */ 146 #define SIFCTR_TFUA_SHIFT 20 147 #define SIFCTR_TFUA(i) ((i) << SIFCTR_TFUA_SHIFT) 148 #define SIFCTR_RFWM_MASK GENMASK(15, 13) /* Receive FIFO Watermark */ 149 #define SIFCTR_RFWM_1 (0 << 13) /* Transfer Request when 1 valid stages */ 150 #define SIFCTR_RFWM_4 (1 << 13) /* Transfer Request when 4 valid stages */ 151 #define SIFCTR_RFWM_8 (2 << 13) /* Transfer Request when 8 valid stages */ 152 #define SIFCTR_RFWM_16 (3 << 13) /* Transfer Request when 16 valid stages */ 153 #define SIFCTR_RFWM_32 (4 << 13) /* Transfer Request when 32 valid stages */ 154 #define SIFCTR_RFWM_64 (5 << 13) /* Transfer Request when 64 valid stages */ 155 #define SIFCTR_RFWM_128 (6 << 13) /* Transfer Request when 128 valid stages */ 156 #define SIFCTR_RFWM_256 (7 << 13) /* Transfer Request when 256 valid stages */ 157 #define SIFCTR_RFUA_MASK GENMASK(12, 4) /* Receive FIFO Usable Area (0x40 = full) */ 158 #define SIFCTR_RFUA_SHIFT 4 159 #define SIFCTR_RFUA(i) ((i) << SIFCTR_RFUA_SHIFT) 160 161 /* SISTR */ 162 #define SISTR_TFEMP BIT(29) /* Transmit FIFO Empty */ 163 #define SISTR_TDREQ BIT(28) /* Transmit Data Transfer Request */ 164 #define SISTR_TEOF BIT(23) /* Frame Transmission End */ 165 #define SISTR_TFSERR BIT(21) /* Transmit Frame Synchronization Error */ 166 #define SISTR_TFOVF BIT(20) /* Transmit FIFO Overflow */ 167 #define SISTR_TFUDF BIT(19) /* Transmit FIFO Underflow */ 168 #define SISTR_RFFUL BIT(13) /* Receive FIFO Full */ 169 #define SISTR_RDREQ BIT(12) /* Receive Data Transfer Request */ 170 #define SISTR_REOF BIT(7) /* Frame Reception End */ 171 #define SISTR_RFSERR BIT(5) /* Receive Frame Synchronization Error */ 172 #define SISTR_RFUDF BIT(4) /* Receive FIFO Underflow */ 173 #define SISTR_RFOVF BIT(3) /* Receive FIFO Overflow */ 174 175 /* SIIER */ 176 #define SIIER_TDMAE BIT(31) /* Transmit Data DMA Transfer Req. Enable */ 177 #define SIIER_TFEMPE BIT(29) /* Transmit FIFO Empty Enable */ 178 #define SIIER_TDREQE BIT(28) /* Transmit Data Transfer Request Enable */ 179 #define SIIER_TEOFE BIT(23) /* Frame Transmission End Enable */ 180 #define SIIER_TFSERRE BIT(21) /* Transmit Frame Sync Error Enable */ 181 #define SIIER_TFOVFE BIT(20) /* Transmit FIFO Overflow Enable */ 182 #define SIIER_TFUDFE BIT(19) /* Transmit FIFO Underflow Enable */ 183 #define SIIER_RDMAE BIT(15) /* Receive Data DMA Transfer Req. Enable */ 184 #define SIIER_RFFULE BIT(13) /* Receive FIFO Full Enable */ 185 #define SIIER_RDREQE BIT(12) /* Receive Data Transfer Request Enable */ 186 #define SIIER_REOFE BIT(7) /* Frame Reception End Enable */ 187 #define SIIER_RFSERRE BIT(5) /* Receive Frame Sync Error Enable */ 188 #define SIIER_RFUDFE BIT(4) /* Receive FIFO Underflow Enable */ 189 #define SIIER_RFOVFE BIT(3) /* Receive FIFO Overflow Enable */ 190 191 192 static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs) 193 { 194 switch (reg_offs) { 195 case SITSCR: 196 case SIRSCR: 197 return ioread16(p->mapbase + reg_offs); 198 default: 199 return ioread32(p->mapbase + reg_offs); 200 } 201 } 202 203 static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs, 204 u32 value) 205 { 206 switch (reg_offs) { 207 case SITSCR: 208 case SIRSCR: 209 iowrite16(value, p->mapbase + reg_offs); 210 break; 211 default: 212 iowrite32(value, p->mapbase + reg_offs); 213 break; 214 } 215 } 216 217 static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p, 218 u32 clr, u32 set) 219 { 220 u32 mask = clr | set; 221 u32 data; 222 223 data = sh_msiof_read(p, SICTR); 224 data &= ~clr; 225 data |= set; 226 sh_msiof_write(p, SICTR, data); 227 228 return readl_poll_timeout_atomic(p->mapbase + SICTR, data, 229 (data & mask) == set, 1, 100); 230 } 231 232 static irqreturn_t sh_msiof_spi_irq(int irq, void *data) 233 { 234 struct sh_msiof_spi_priv *p = data; 235 236 /* just disable the interrupt and wake up */ 237 sh_msiof_write(p, SIIER, 0); 238 complete(&p->done); 239 240 return IRQ_HANDLED; 241 } 242 243 static void sh_msiof_spi_reset_regs(struct sh_msiof_spi_priv *p) 244 { 245 u32 mask = SICTR_TXRST | SICTR_RXRST; 246 u32 data; 247 248 data = sh_msiof_read(p, SICTR); 249 data |= mask; 250 sh_msiof_write(p, SICTR, data); 251 252 readl_poll_timeout_atomic(p->mapbase + SICTR, data, !(data & mask), 1, 253 100); 254 } 255 256 static const u32 sh_msiof_spi_div_array[] = { 257 SISCR_BRDV_DIV_1, SISCR_BRDV_DIV_2, SISCR_BRDV_DIV_4, 258 SISCR_BRDV_DIV_8, SISCR_BRDV_DIV_16, SISCR_BRDV_DIV_32, 259 }; 260 261 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p, 262 struct spi_transfer *t) 263 { 264 unsigned long parent_rate = clk_get_rate(p->clk); 265 unsigned int div_pow = p->min_div_pow; 266 u32 spi_hz = t->speed_hz; 267 unsigned long div; 268 u32 brps, scr; 269 270 if (!spi_hz || !parent_rate) { 271 WARN(1, "Invalid clock rate parameters %lu and %u\n", 272 parent_rate, spi_hz); 273 return; 274 } 275 276 div = DIV_ROUND_UP(parent_rate, spi_hz); 277 if (div <= 1024) { 278 /* SISCR_BRDV_DIV_1 is valid only if BRPS is x 1/1 or x 1/2 */ 279 if (!div_pow && div <= 32 && div > 2) 280 div_pow = 1; 281 282 if (div_pow) 283 brps = (div + 1) >> div_pow; 284 else 285 brps = div; 286 287 for (; brps > 32; div_pow++) 288 brps = (brps + 1) >> 1; 289 } else { 290 /* Set transfer rate composite divisor to 2^5 * 32 = 1024 */ 291 dev_err(&p->pdev->dev, 292 "Requested SPI transfer rate %d is too low\n", spi_hz); 293 div_pow = 5; 294 brps = 32; 295 } 296 297 t->effective_speed_hz = parent_rate / (brps << div_pow); 298 299 scr = sh_msiof_spi_div_array[div_pow] | SISCR_BRPS(brps); 300 sh_msiof_write(p, SITSCR, scr); 301 if (!(p->ctlr->flags & SPI_CONTROLLER_MUST_TX)) 302 sh_msiof_write(p, SIRSCR, scr); 303 } 304 305 static u32 sh_msiof_get_delay_bit(u32 dtdl_or_syncdl) 306 { 307 /* 308 * DTDL/SYNCDL bit : p->info->dtdl or p->info->syncdl 309 * b'000 : 0 310 * b'001 : 100 311 * b'010 : 200 312 * b'011 (SYNCDL only) : 300 313 * b'101 : 50 314 * b'110 : 150 315 */ 316 if (dtdl_or_syncdl % 100) 317 return dtdl_or_syncdl / 100 + 5; 318 else 319 return dtdl_or_syncdl / 100; 320 } 321 322 static u32 sh_msiof_spi_get_dtdl_and_syncdl(struct sh_msiof_spi_priv *p) 323 { 324 u32 val; 325 326 if (!p->info) 327 return 0; 328 329 /* check if DTDL and SYNCDL is allowed value */ 330 if (p->info->dtdl > 200 || p->info->syncdl > 300) { 331 dev_warn(&p->pdev->dev, "DTDL or SYNCDL is too large\n"); 332 return 0; 333 } 334 335 /* check if the sum of DTDL and SYNCDL becomes an integer value */ 336 if ((p->info->dtdl + p->info->syncdl) % 100) { 337 dev_warn(&p->pdev->dev, "the sum of DTDL/SYNCDL is not good\n"); 338 return 0; 339 } 340 341 val = sh_msiof_get_delay_bit(p->info->dtdl) << SIMDR1_DTDL_SHIFT; 342 val |= sh_msiof_get_delay_bit(p->info->syncdl) << SIMDR1_SYNCDL_SHIFT; 343 344 return val; 345 } 346 347 static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p, u32 ss, 348 u32 cpol, u32 cpha, 349 u32 tx_hi_z, u32 lsb_first, u32 cs_high) 350 { 351 u32 tmp; 352 int edge; 353 354 /* 355 * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG 356 * 0 0 10 10 1 1 357 * 0 1 10 10 0 0 358 * 1 0 11 11 0 0 359 * 1 1 11 11 1 1 360 */ 361 tmp = SIMDR1_SYNCMD_SPI | 1 << SIMDR1_FLD_SHIFT | SIMDR1_XXSTP; 362 tmp |= !cs_high << SIMDR1_SYNCAC_SHIFT; 363 tmp |= lsb_first << SIMDR1_BITLSB_SHIFT; 364 tmp |= sh_msiof_spi_get_dtdl_and_syncdl(p); 365 if (spi_controller_is_slave(p->ctlr)) { 366 sh_msiof_write(p, SITMDR1, tmp | SITMDR1_PCON); 367 } else { 368 sh_msiof_write(p, SITMDR1, 369 tmp | SIMDR1_TRMD | SITMDR1_PCON | 370 (ss < MAX_SS ? ss : 0) << SITMDR1_SYNCCH_SHIFT); 371 } 372 if (p->ctlr->flags & SPI_CONTROLLER_MUST_TX) { 373 /* These bits are reserved if RX needs TX */ 374 tmp &= ~0x0000ffff; 375 } 376 sh_msiof_write(p, SIRMDR1, tmp); 377 378 tmp = 0; 379 tmp |= SICTR_TSCKIZ_SCK | cpol << SICTR_TSCKIZ_POL_SHIFT; 380 tmp |= SICTR_RSCKIZ_SCK | cpol << SICTR_RSCKIZ_POL_SHIFT; 381 382 edge = cpol ^ !cpha; 383 384 tmp |= edge << SICTR_TEDG_SHIFT; 385 tmp |= edge << SICTR_REDG_SHIFT; 386 tmp |= tx_hi_z ? SICTR_TXDIZ_HIZ : SICTR_TXDIZ_LOW; 387 sh_msiof_write(p, SICTR, tmp); 388 } 389 390 static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p, 391 const void *tx_buf, void *rx_buf, 392 u32 bits, u32 words) 393 { 394 u32 dr2 = SIMDR2_BITLEN1(bits) | SIMDR2_WDLEN1(words); 395 396 if (tx_buf || (p->ctlr->flags & SPI_CONTROLLER_MUST_TX)) 397 sh_msiof_write(p, SITMDR2, dr2); 398 else 399 sh_msiof_write(p, SITMDR2, dr2 | SIMDR2_GRPMASK1); 400 401 if (rx_buf) 402 sh_msiof_write(p, SIRMDR2, dr2); 403 } 404 405 static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p) 406 { 407 sh_msiof_write(p, SISTR, 408 sh_msiof_read(p, SISTR) & ~(SISTR_TDREQ | SISTR_RDREQ)); 409 } 410 411 static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p, 412 const void *tx_buf, int words, int fs) 413 { 414 const u8 *buf_8 = tx_buf; 415 int k; 416 417 for (k = 0; k < words; k++) 418 sh_msiof_write(p, SITFDR, buf_8[k] << fs); 419 } 420 421 static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p, 422 const void *tx_buf, int words, int fs) 423 { 424 const u16 *buf_16 = tx_buf; 425 int k; 426 427 for (k = 0; k < words; k++) 428 sh_msiof_write(p, SITFDR, buf_16[k] << fs); 429 } 430 431 static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p, 432 const void *tx_buf, int words, int fs) 433 { 434 const u16 *buf_16 = tx_buf; 435 int k; 436 437 for (k = 0; k < words; k++) 438 sh_msiof_write(p, SITFDR, get_unaligned(&buf_16[k]) << fs); 439 } 440 441 static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p, 442 const void *tx_buf, int words, int fs) 443 { 444 const u32 *buf_32 = tx_buf; 445 int k; 446 447 for (k = 0; k < words; k++) 448 sh_msiof_write(p, SITFDR, buf_32[k] << fs); 449 } 450 451 static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p, 452 const void *tx_buf, int words, int fs) 453 { 454 const u32 *buf_32 = tx_buf; 455 int k; 456 457 for (k = 0; k < words; k++) 458 sh_msiof_write(p, SITFDR, get_unaligned(&buf_32[k]) << fs); 459 } 460 461 static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p, 462 const void *tx_buf, int words, int fs) 463 { 464 const u32 *buf_32 = tx_buf; 465 int k; 466 467 for (k = 0; k < words; k++) 468 sh_msiof_write(p, SITFDR, swab32(buf_32[k] << fs)); 469 } 470 471 static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p, 472 const void *tx_buf, int words, int fs) 473 { 474 const u32 *buf_32 = tx_buf; 475 int k; 476 477 for (k = 0; k < words; k++) 478 sh_msiof_write(p, SITFDR, swab32(get_unaligned(&buf_32[k]) << fs)); 479 } 480 481 static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p, 482 void *rx_buf, int words, int fs) 483 { 484 u8 *buf_8 = rx_buf; 485 int k; 486 487 for (k = 0; k < words; k++) 488 buf_8[k] = sh_msiof_read(p, SIRFDR) >> fs; 489 } 490 491 static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p, 492 void *rx_buf, int words, int fs) 493 { 494 u16 *buf_16 = rx_buf; 495 int k; 496 497 for (k = 0; k < words; k++) 498 buf_16[k] = sh_msiof_read(p, SIRFDR) >> fs; 499 } 500 501 static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p, 502 void *rx_buf, int words, int fs) 503 { 504 u16 *buf_16 = rx_buf; 505 int k; 506 507 for (k = 0; k < words; k++) 508 put_unaligned(sh_msiof_read(p, SIRFDR) >> fs, &buf_16[k]); 509 } 510 511 static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p, 512 void *rx_buf, int words, int fs) 513 { 514 u32 *buf_32 = rx_buf; 515 int k; 516 517 for (k = 0; k < words; k++) 518 buf_32[k] = sh_msiof_read(p, SIRFDR) >> fs; 519 } 520 521 static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p, 522 void *rx_buf, int words, int fs) 523 { 524 u32 *buf_32 = rx_buf; 525 int k; 526 527 for (k = 0; k < words; k++) 528 put_unaligned(sh_msiof_read(p, SIRFDR) >> fs, &buf_32[k]); 529 } 530 531 static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p, 532 void *rx_buf, int words, int fs) 533 { 534 u32 *buf_32 = rx_buf; 535 int k; 536 537 for (k = 0; k < words; k++) 538 buf_32[k] = swab32(sh_msiof_read(p, SIRFDR) >> fs); 539 } 540 541 static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p, 542 void *rx_buf, int words, int fs) 543 { 544 u32 *buf_32 = rx_buf; 545 int k; 546 547 for (k = 0; k < words; k++) 548 put_unaligned(swab32(sh_msiof_read(p, SIRFDR) >> fs), &buf_32[k]); 549 } 550 551 static int sh_msiof_spi_setup(struct spi_device *spi) 552 { 553 struct sh_msiof_spi_priv *p = 554 spi_controller_get_devdata(spi->controller); 555 u32 clr, set, tmp; 556 557 if (spi->cs_gpiod || spi_controller_is_slave(p->ctlr)) 558 return 0; 559 560 if (p->native_cs_inited && 561 (p->native_cs_high == !!(spi->mode & SPI_CS_HIGH))) 562 return 0; 563 564 /* Configure native chip select mode/polarity early */ 565 clr = SIMDR1_SYNCMD_MASK; 566 set = SIMDR1_SYNCMD_SPI; 567 if (spi->mode & SPI_CS_HIGH) 568 clr |= BIT(SIMDR1_SYNCAC_SHIFT); 569 else 570 set |= BIT(SIMDR1_SYNCAC_SHIFT); 571 pm_runtime_get_sync(&p->pdev->dev); 572 tmp = sh_msiof_read(p, SITMDR1) & ~clr; 573 sh_msiof_write(p, SITMDR1, tmp | set | SIMDR1_TRMD | SITMDR1_PCON); 574 tmp = sh_msiof_read(p, SIRMDR1) & ~clr; 575 sh_msiof_write(p, SIRMDR1, tmp | set); 576 pm_runtime_put(&p->pdev->dev); 577 p->native_cs_high = spi->mode & SPI_CS_HIGH; 578 p->native_cs_inited = true; 579 return 0; 580 } 581 582 static int sh_msiof_prepare_message(struct spi_controller *ctlr, 583 struct spi_message *msg) 584 { 585 struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); 586 const struct spi_device *spi = msg->spi; 587 u32 ss, cs_high; 588 589 /* Configure pins before asserting CS */ 590 if (spi->cs_gpiod) { 591 ss = ctlr->unused_native_cs; 592 cs_high = p->native_cs_high; 593 } else { 594 ss = spi->chip_select; 595 cs_high = !!(spi->mode & SPI_CS_HIGH); 596 } 597 sh_msiof_spi_set_pin_regs(p, ss, !!(spi->mode & SPI_CPOL), 598 !!(spi->mode & SPI_CPHA), 599 !!(spi->mode & SPI_3WIRE), 600 !!(spi->mode & SPI_LSB_FIRST), cs_high); 601 return 0; 602 } 603 604 static int sh_msiof_spi_start(struct sh_msiof_spi_priv *p, void *rx_buf) 605 { 606 bool slave = spi_controller_is_slave(p->ctlr); 607 int ret = 0; 608 609 /* setup clock and rx/tx signals */ 610 if (!slave) 611 ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_TSCKE); 612 if (rx_buf && !ret) 613 ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_RXE); 614 if (!ret) 615 ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_TXE); 616 617 /* start by setting frame bit */ 618 if (!ret && !slave) 619 ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_TFSE); 620 621 return ret; 622 } 623 624 static int sh_msiof_spi_stop(struct sh_msiof_spi_priv *p, void *rx_buf) 625 { 626 bool slave = spi_controller_is_slave(p->ctlr); 627 int ret = 0; 628 629 /* shut down frame, rx/tx and clock signals */ 630 if (!slave) 631 ret = sh_msiof_modify_ctr_wait(p, SICTR_TFSE, 0); 632 if (!ret) 633 ret = sh_msiof_modify_ctr_wait(p, SICTR_TXE, 0); 634 if (rx_buf && !ret) 635 ret = sh_msiof_modify_ctr_wait(p, SICTR_RXE, 0); 636 if (!ret && !slave) 637 ret = sh_msiof_modify_ctr_wait(p, SICTR_TSCKE, 0); 638 639 return ret; 640 } 641 642 static int sh_msiof_slave_abort(struct spi_controller *ctlr) 643 { 644 struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); 645 646 p->slave_aborted = true; 647 complete(&p->done); 648 complete(&p->done_txdma); 649 return 0; 650 } 651 652 static int sh_msiof_wait_for_completion(struct sh_msiof_spi_priv *p, 653 struct completion *x) 654 { 655 if (spi_controller_is_slave(p->ctlr)) { 656 if (wait_for_completion_interruptible(x) || 657 p->slave_aborted) { 658 dev_dbg(&p->pdev->dev, "interrupted\n"); 659 return -EINTR; 660 } 661 } else { 662 if (!wait_for_completion_timeout(x, HZ)) { 663 dev_err(&p->pdev->dev, "timeout\n"); 664 return -ETIMEDOUT; 665 } 666 } 667 668 return 0; 669 } 670 671 static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p, 672 void (*tx_fifo)(struct sh_msiof_spi_priv *, 673 const void *, int, int), 674 void (*rx_fifo)(struct sh_msiof_spi_priv *, 675 void *, int, int), 676 const void *tx_buf, void *rx_buf, 677 int words, int bits) 678 { 679 int fifo_shift; 680 int ret; 681 682 /* limit maximum word transfer to rx/tx fifo size */ 683 if (tx_buf) 684 words = min_t(int, words, p->tx_fifo_size); 685 if (rx_buf) 686 words = min_t(int, words, p->rx_fifo_size); 687 688 /* the fifo contents need shifting */ 689 fifo_shift = 32 - bits; 690 691 /* default FIFO watermarks for PIO */ 692 sh_msiof_write(p, SIFCTR, 0); 693 694 /* setup msiof transfer mode registers */ 695 sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words); 696 sh_msiof_write(p, SIIER, SIIER_TEOFE | SIIER_REOFE); 697 698 /* write tx fifo */ 699 if (tx_buf) 700 tx_fifo(p, tx_buf, words, fifo_shift); 701 702 reinit_completion(&p->done); 703 p->slave_aborted = false; 704 705 ret = sh_msiof_spi_start(p, rx_buf); 706 if (ret) { 707 dev_err(&p->pdev->dev, "failed to start hardware\n"); 708 goto stop_ier; 709 } 710 711 /* wait for tx fifo to be emptied / rx fifo to be filled */ 712 ret = sh_msiof_wait_for_completion(p, &p->done); 713 if (ret) 714 goto stop_reset; 715 716 /* read rx fifo */ 717 if (rx_buf) 718 rx_fifo(p, rx_buf, words, fifo_shift); 719 720 /* clear status bits */ 721 sh_msiof_reset_str(p); 722 723 ret = sh_msiof_spi_stop(p, rx_buf); 724 if (ret) { 725 dev_err(&p->pdev->dev, "failed to shut down hardware\n"); 726 return ret; 727 } 728 729 return words; 730 731 stop_reset: 732 sh_msiof_reset_str(p); 733 sh_msiof_spi_stop(p, rx_buf); 734 stop_ier: 735 sh_msiof_write(p, SIIER, 0); 736 return ret; 737 } 738 739 static void sh_msiof_dma_complete(void *arg) 740 { 741 complete(arg); 742 } 743 744 static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx, 745 void *rx, unsigned int len) 746 { 747 u32 ier_bits = 0; 748 struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL; 749 dma_cookie_t cookie; 750 int ret; 751 752 /* First prepare and submit the DMA request(s), as this may fail */ 753 if (rx) { 754 ier_bits |= SIIER_RDREQE | SIIER_RDMAE; 755 desc_rx = dmaengine_prep_slave_single(p->ctlr->dma_rx, 756 p->rx_dma_addr, len, DMA_DEV_TO_MEM, 757 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 758 if (!desc_rx) 759 return -EAGAIN; 760 761 desc_rx->callback = sh_msiof_dma_complete; 762 desc_rx->callback_param = &p->done; 763 cookie = dmaengine_submit(desc_rx); 764 if (dma_submit_error(cookie)) 765 return cookie; 766 } 767 768 if (tx) { 769 ier_bits |= SIIER_TDREQE | SIIER_TDMAE; 770 dma_sync_single_for_device(p->ctlr->dma_tx->device->dev, 771 p->tx_dma_addr, len, DMA_TO_DEVICE); 772 desc_tx = dmaengine_prep_slave_single(p->ctlr->dma_tx, 773 p->tx_dma_addr, len, DMA_MEM_TO_DEV, 774 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 775 if (!desc_tx) { 776 ret = -EAGAIN; 777 goto no_dma_tx; 778 } 779 780 desc_tx->callback = sh_msiof_dma_complete; 781 desc_tx->callback_param = &p->done_txdma; 782 cookie = dmaengine_submit(desc_tx); 783 if (dma_submit_error(cookie)) { 784 ret = cookie; 785 goto no_dma_tx; 786 } 787 } 788 789 /* 1 stage FIFO watermarks for DMA */ 790 sh_msiof_write(p, SIFCTR, SIFCTR_TFWM_1 | SIFCTR_RFWM_1); 791 792 /* setup msiof transfer mode registers (32-bit words) */ 793 sh_msiof_spi_set_mode_regs(p, tx, rx, 32, len / 4); 794 795 sh_msiof_write(p, SIIER, ier_bits); 796 797 reinit_completion(&p->done); 798 if (tx) 799 reinit_completion(&p->done_txdma); 800 p->slave_aborted = false; 801 802 /* Now start DMA */ 803 if (rx) 804 dma_async_issue_pending(p->ctlr->dma_rx); 805 if (tx) 806 dma_async_issue_pending(p->ctlr->dma_tx); 807 808 ret = sh_msiof_spi_start(p, rx); 809 if (ret) { 810 dev_err(&p->pdev->dev, "failed to start hardware\n"); 811 goto stop_dma; 812 } 813 814 if (tx) { 815 /* wait for tx DMA completion */ 816 ret = sh_msiof_wait_for_completion(p, &p->done_txdma); 817 if (ret) 818 goto stop_reset; 819 } 820 821 if (rx) { 822 /* wait for rx DMA completion */ 823 ret = sh_msiof_wait_for_completion(p, &p->done); 824 if (ret) 825 goto stop_reset; 826 827 sh_msiof_write(p, SIIER, 0); 828 } else { 829 /* wait for tx fifo to be emptied */ 830 sh_msiof_write(p, SIIER, SIIER_TEOFE); 831 ret = sh_msiof_wait_for_completion(p, &p->done); 832 if (ret) 833 goto stop_reset; 834 } 835 836 /* clear status bits */ 837 sh_msiof_reset_str(p); 838 839 ret = sh_msiof_spi_stop(p, rx); 840 if (ret) { 841 dev_err(&p->pdev->dev, "failed to shut down hardware\n"); 842 return ret; 843 } 844 845 if (rx) 846 dma_sync_single_for_cpu(p->ctlr->dma_rx->device->dev, 847 p->rx_dma_addr, len, DMA_FROM_DEVICE); 848 849 return 0; 850 851 stop_reset: 852 sh_msiof_reset_str(p); 853 sh_msiof_spi_stop(p, rx); 854 stop_dma: 855 if (tx) 856 dmaengine_terminate_sync(p->ctlr->dma_tx); 857 no_dma_tx: 858 if (rx) 859 dmaengine_terminate_sync(p->ctlr->dma_rx); 860 sh_msiof_write(p, SIIER, 0); 861 return ret; 862 } 863 864 static void copy_bswap32(u32 *dst, const u32 *src, unsigned int words) 865 { 866 /* src or dst can be unaligned, but not both */ 867 if ((unsigned long)src & 3) { 868 while (words--) { 869 *dst++ = swab32(get_unaligned(src)); 870 src++; 871 } 872 } else if ((unsigned long)dst & 3) { 873 while (words--) { 874 put_unaligned(swab32(*src++), dst); 875 dst++; 876 } 877 } else { 878 while (words--) 879 *dst++ = swab32(*src++); 880 } 881 } 882 883 static void copy_wswap32(u32 *dst, const u32 *src, unsigned int words) 884 { 885 /* src or dst can be unaligned, but not both */ 886 if ((unsigned long)src & 3) { 887 while (words--) { 888 *dst++ = swahw32(get_unaligned(src)); 889 src++; 890 } 891 } else if ((unsigned long)dst & 3) { 892 while (words--) { 893 put_unaligned(swahw32(*src++), dst); 894 dst++; 895 } 896 } else { 897 while (words--) 898 *dst++ = swahw32(*src++); 899 } 900 } 901 902 static void copy_plain32(u32 *dst, const u32 *src, unsigned int words) 903 { 904 memcpy(dst, src, words * 4); 905 } 906 907 static int sh_msiof_transfer_one(struct spi_controller *ctlr, 908 struct spi_device *spi, 909 struct spi_transfer *t) 910 { 911 struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); 912 void (*copy32)(u32 *, const u32 *, unsigned int); 913 void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int); 914 void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int); 915 const void *tx_buf = t->tx_buf; 916 void *rx_buf = t->rx_buf; 917 unsigned int len = t->len; 918 unsigned int bits = t->bits_per_word; 919 unsigned int bytes_per_word; 920 unsigned int words; 921 int n; 922 bool swab; 923 int ret; 924 925 /* reset registers */ 926 sh_msiof_spi_reset_regs(p); 927 928 /* setup clocks (clock already enabled in chipselect()) */ 929 if (!spi_controller_is_slave(p->ctlr)) 930 sh_msiof_spi_set_clk_regs(p, t); 931 932 while (ctlr->dma_tx && len > 15) { 933 /* 934 * DMA supports 32-bit words only, hence pack 8-bit and 16-bit 935 * words, with byte resp. word swapping. 936 */ 937 unsigned int l = 0; 938 939 if (tx_buf) 940 l = min(round_down(len, 4), p->tx_fifo_size * 4); 941 if (rx_buf) 942 l = min(round_down(len, 4), p->rx_fifo_size * 4); 943 944 if (bits <= 8) { 945 copy32 = copy_bswap32; 946 } else if (bits <= 16) { 947 copy32 = copy_wswap32; 948 } else { 949 copy32 = copy_plain32; 950 } 951 952 if (tx_buf) 953 copy32(p->tx_dma_page, tx_buf, l / 4); 954 955 ret = sh_msiof_dma_once(p, tx_buf, rx_buf, l); 956 if (ret == -EAGAIN) { 957 dev_warn_once(&p->pdev->dev, 958 "DMA not available, falling back to PIO\n"); 959 break; 960 } 961 if (ret) 962 return ret; 963 964 if (rx_buf) { 965 copy32(rx_buf, p->rx_dma_page, l / 4); 966 rx_buf += l; 967 } 968 if (tx_buf) 969 tx_buf += l; 970 971 len -= l; 972 if (!len) 973 return 0; 974 } 975 976 if (bits <= 8 && len > 15) { 977 bits = 32; 978 swab = true; 979 } else { 980 swab = false; 981 } 982 983 /* setup bytes per word and fifo read/write functions */ 984 if (bits <= 8) { 985 bytes_per_word = 1; 986 tx_fifo = sh_msiof_spi_write_fifo_8; 987 rx_fifo = sh_msiof_spi_read_fifo_8; 988 } else if (bits <= 16) { 989 bytes_per_word = 2; 990 if ((unsigned long)tx_buf & 0x01) 991 tx_fifo = sh_msiof_spi_write_fifo_16u; 992 else 993 tx_fifo = sh_msiof_spi_write_fifo_16; 994 995 if ((unsigned long)rx_buf & 0x01) 996 rx_fifo = sh_msiof_spi_read_fifo_16u; 997 else 998 rx_fifo = sh_msiof_spi_read_fifo_16; 999 } else if (swab) { 1000 bytes_per_word = 4; 1001 if ((unsigned long)tx_buf & 0x03) 1002 tx_fifo = sh_msiof_spi_write_fifo_s32u; 1003 else 1004 tx_fifo = sh_msiof_spi_write_fifo_s32; 1005 1006 if ((unsigned long)rx_buf & 0x03) 1007 rx_fifo = sh_msiof_spi_read_fifo_s32u; 1008 else 1009 rx_fifo = sh_msiof_spi_read_fifo_s32; 1010 } else { 1011 bytes_per_word = 4; 1012 if ((unsigned long)tx_buf & 0x03) 1013 tx_fifo = sh_msiof_spi_write_fifo_32u; 1014 else 1015 tx_fifo = sh_msiof_spi_write_fifo_32; 1016 1017 if ((unsigned long)rx_buf & 0x03) 1018 rx_fifo = sh_msiof_spi_read_fifo_32u; 1019 else 1020 rx_fifo = sh_msiof_spi_read_fifo_32; 1021 } 1022 1023 /* transfer in fifo sized chunks */ 1024 words = len / bytes_per_word; 1025 1026 while (words > 0) { 1027 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo, tx_buf, rx_buf, 1028 words, bits); 1029 if (n < 0) 1030 return n; 1031 1032 if (tx_buf) 1033 tx_buf += n * bytes_per_word; 1034 if (rx_buf) 1035 rx_buf += n * bytes_per_word; 1036 words -= n; 1037 1038 if (words == 0 && (len % bytes_per_word)) { 1039 words = len % bytes_per_word; 1040 bits = t->bits_per_word; 1041 bytes_per_word = 1; 1042 tx_fifo = sh_msiof_spi_write_fifo_8; 1043 rx_fifo = sh_msiof_spi_read_fifo_8; 1044 } 1045 } 1046 1047 return 0; 1048 } 1049 1050 static const struct sh_msiof_chipdata sh_data = { 1051 .bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32), 1052 .tx_fifo_size = 64, 1053 .rx_fifo_size = 64, 1054 .ctlr_flags = 0, 1055 .min_div_pow = 0, 1056 }; 1057 1058 static const struct sh_msiof_chipdata rcar_gen2_data = { 1059 .bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) | 1060 SPI_BPW_MASK(24) | SPI_BPW_MASK(32), 1061 .tx_fifo_size = 64, 1062 .rx_fifo_size = 64, 1063 .ctlr_flags = SPI_CONTROLLER_MUST_TX, 1064 .min_div_pow = 0, 1065 }; 1066 1067 static const struct sh_msiof_chipdata rcar_gen3_data = { 1068 .bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) | 1069 SPI_BPW_MASK(24) | SPI_BPW_MASK(32), 1070 .tx_fifo_size = 64, 1071 .rx_fifo_size = 64, 1072 .ctlr_flags = SPI_CONTROLLER_MUST_TX, 1073 .min_div_pow = 1, 1074 }; 1075 1076 static const struct of_device_id sh_msiof_match[] = { 1077 { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data }, 1078 { .compatible = "renesas,msiof-r8a7743", .data = &rcar_gen2_data }, 1079 { .compatible = "renesas,msiof-r8a7745", .data = &rcar_gen2_data }, 1080 { .compatible = "renesas,msiof-r8a7790", .data = &rcar_gen2_data }, 1081 { .compatible = "renesas,msiof-r8a7791", .data = &rcar_gen2_data }, 1082 { .compatible = "renesas,msiof-r8a7792", .data = &rcar_gen2_data }, 1083 { .compatible = "renesas,msiof-r8a7793", .data = &rcar_gen2_data }, 1084 { .compatible = "renesas,msiof-r8a7794", .data = &rcar_gen2_data }, 1085 { .compatible = "renesas,rcar-gen2-msiof", .data = &rcar_gen2_data }, 1086 { .compatible = "renesas,msiof-r8a7796", .data = &rcar_gen3_data }, 1087 { .compatible = "renesas,rcar-gen3-msiof", .data = &rcar_gen3_data }, 1088 { .compatible = "renesas,sh-msiof", .data = &sh_data }, /* Deprecated */ 1089 {}, 1090 }; 1091 MODULE_DEVICE_TABLE(of, sh_msiof_match); 1092 1093 #ifdef CONFIG_OF 1094 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev) 1095 { 1096 struct sh_msiof_spi_info *info; 1097 struct device_node *np = dev->of_node; 1098 u32 num_cs = 1; 1099 1100 info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL); 1101 if (!info) 1102 return NULL; 1103 1104 info->mode = of_property_read_bool(np, "spi-slave") ? MSIOF_SPI_SLAVE 1105 : MSIOF_SPI_MASTER; 1106 1107 /* Parse the MSIOF properties */ 1108 if (info->mode == MSIOF_SPI_MASTER) 1109 of_property_read_u32(np, "num-cs", &num_cs); 1110 of_property_read_u32(np, "renesas,tx-fifo-size", 1111 &info->tx_fifo_override); 1112 of_property_read_u32(np, "renesas,rx-fifo-size", 1113 &info->rx_fifo_override); 1114 of_property_read_u32(np, "renesas,dtdl", &info->dtdl); 1115 of_property_read_u32(np, "renesas,syncdl", &info->syncdl); 1116 1117 info->num_chipselect = num_cs; 1118 1119 return info; 1120 } 1121 #else 1122 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev) 1123 { 1124 return NULL; 1125 } 1126 #endif 1127 1128 static struct dma_chan *sh_msiof_request_dma_chan(struct device *dev, 1129 enum dma_transfer_direction dir, unsigned int id, dma_addr_t port_addr) 1130 { 1131 dma_cap_mask_t mask; 1132 struct dma_chan *chan; 1133 struct dma_slave_config cfg; 1134 int ret; 1135 1136 dma_cap_zero(mask); 1137 dma_cap_set(DMA_SLAVE, mask); 1138 1139 chan = dma_request_slave_channel_compat(mask, shdma_chan_filter, 1140 (void *)(unsigned long)id, dev, 1141 dir == DMA_MEM_TO_DEV ? "tx" : "rx"); 1142 if (!chan) { 1143 dev_warn(dev, "dma_request_slave_channel_compat failed\n"); 1144 return NULL; 1145 } 1146 1147 memset(&cfg, 0, sizeof(cfg)); 1148 cfg.direction = dir; 1149 if (dir == DMA_MEM_TO_DEV) { 1150 cfg.dst_addr = port_addr; 1151 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 1152 } else { 1153 cfg.src_addr = port_addr; 1154 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 1155 } 1156 1157 ret = dmaengine_slave_config(chan, &cfg); 1158 if (ret) { 1159 dev_warn(dev, "dmaengine_slave_config failed %d\n", ret); 1160 dma_release_channel(chan); 1161 return NULL; 1162 } 1163 1164 return chan; 1165 } 1166 1167 static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p) 1168 { 1169 struct platform_device *pdev = p->pdev; 1170 struct device *dev = &pdev->dev; 1171 const struct sh_msiof_spi_info *info = p->info; 1172 unsigned int dma_tx_id, dma_rx_id; 1173 const struct resource *res; 1174 struct spi_controller *ctlr; 1175 struct device *tx_dev, *rx_dev; 1176 1177 if (dev->of_node) { 1178 /* In the OF case we will get the slave IDs from the DT */ 1179 dma_tx_id = 0; 1180 dma_rx_id = 0; 1181 } else if (info && info->dma_tx_id && info->dma_rx_id) { 1182 dma_tx_id = info->dma_tx_id; 1183 dma_rx_id = info->dma_rx_id; 1184 } else { 1185 /* The driver assumes no error */ 1186 return 0; 1187 } 1188 1189 /* The DMA engine uses the second register set, if present */ 1190 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 1191 if (!res) 1192 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1193 1194 ctlr = p->ctlr; 1195 ctlr->dma_tx = sh_msiof_request_dma_chan(dev, DMA_MEM_TO_DEV, 1196 dma_tx_id, res->start + SITFDR); 1197 if (!ctlr->dma_tx) 1198 return -ENODEV; 1199 1200 ctlr->dma_rx = sh_msiof_request_dma_chan(dev, DMA_DEV_TO_MEM, 1201 dma_rx_id, res->start + SIRFDR); 1202 if (!ctlr->dma_rx) 1203 goto free_tx_chan; 1204 1205 p->tx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); 1206 if (!p->tx_dma_page) 1207 goto free_rx_chan; 1208 1209 p->rx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); 1210 if (!p->rx_dma_page) 1211 goto free_tx_page; 1212 1213 tx_dev = ctlr->dma_tx->device->dev; 1214 p->tx_dma_addr = dma_map_single(tx_dev, p->tx_dma_page, PAGE_SIZE, 1215 DMA_TO_DEVICE); 1216 if (dma_mapping_error(tx_dev, p->tx_dma_addr)) 1217 goto free_rx_page; 1218 1219 rx_dev = ctlr->dma_rx->device->dev; 1220 p->rx_dma_addr = dma_map_single(rx_dev, p->rx_dma_page, PAGE_SIZE, 1221 DMA_FROM_DEVICE); 1222 if (dma_mapping_error(rx_dev, p->rx_dma_addr)) 1223 goto unmap_tx_page; 1224 1225 dev_info(dev, "DMA available"); 1226 return 0; 1227 1228 unmap_tx_page: 1229 dma_unmap_single(tx_dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE); 1230 free_rx_page: 1231 free_page((unsigned long)p->rx_dma_page); 1232 free_tx_page: 1233 free_page((unsigned long)p->tx_dma_page); 1234 free_rx_chan: 1235 dma_release_channel(ctlr->dma_rx); 1236 free_tx_chan: 1237 dma_release_channel(ctlr->dma_tx); 1238 ctlr->dma_tx = NULL; 1239 return -ENODEV; 1240 } 1241 1242 static void sh_msiof_release_dma(struct sh_msiof_spi_priv *p) 1243 { 1244 struct spi_controller *ctlr = p->ctlr; 1245 1246 if (!ctlr->dma_tx) 1247 return; 1248 1249 dma_unmap_single(ctlr->dma_rx->device->dev, p->rx_dma_addr, PAGE_SIZE, 1250 DMA_FROM_DEVICE); 1251 dma_unmap_single(ctlr->dma_tx->device->dev, p->tx_dma_addr, PAGE_SIZE, 1252 DMA_TO_DEVICE); 1253 free_page((unsigned long)p->rx_dma_page); 1254 free_page((unsigned long)p->tx_dma_page); 1255 dma_release_channel(ctlr->dma_rx); 1256 dma_release_channel(ctlr->dma_tx); 1257 } 1258 1259 static int sh_msiof_spi_probe(struct platform_device *pdev) 1260 { 1261 struct spi_controller *ctlr; 1262 const struct sh_msiof_chipdata *chipdata; 1263 struct sh_msiof_spi_info *info; 1264 struct sh_msiof_spi_priv *p; 1265 unsigned long clksrc; 1266 int i; 1267 int ret; 1268 1269 chipdata = of_device_get_match_data(&pdev->dev); 1270 if (chipdata) { 1271 info = sh_msiof_spi_parse_dt(&pdev->dev); 1272 } else { 1273 chipdata = (const void *)pdev->id_entry->driver_data; 1274 info = dev_get_platdata(&pdev->dev); 1275 } 1276 1277 if (!info) { 1278 dev_err(&pdev->dev, "failed to obtain device info\n"); 1279 return -ENXIO; 1280 } 1281 1282 if (info->mode == MSIOF_SPI_SLAVE) 1283 ctlr = spi_alloc_slave(&pdev->dev, 1284 sizeof(struct sh_msiof_spi_priv)); 1285 else 1286 ctlr = spi_alloc_master(&pdev->dev, 1287 sizeof(struct sh_msiof_spi_priv)); 1288 if (ctlr == NULL) 1289 return -ENOMEM; 1290 1291 p = spi_controller_get_devdata(ctlr); 1292 1293 platform_set_drvdata(pdev, p); 1294 p->ctlr = ctlr; 1295 p->info = info; 1296 p->min_div_pow = chipdata->min_div_pow; 1297 1298 init_completion(&p->done); 1299 init_completion(&p->done_txdma); 1300 1301 p->clk = devm_clk_get(&pdev->dev, NULL); 1302 if (IS_ERR(p->clk)) { 1303 dev_err(&pdev->dev, "cannot get clock\n"); 1304 ret = PTR_ERR(p->clk); 1305 goto err1; 1306 } 1307 1308 i = platform_get_irq(pdev, 0); 1309 if (i < 0) { 1310 ret = i; 1311 goto err1; 1312 } 1313 1314 p->mapbase = devm_platform_ioremap_resource(pdev, 0); 1315 if (IS_ERR(p->mapbase)) { 1316 ret = PTR_ERR(p->mapbase); 1317 goto err1; 1318 } 1319 1320 ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0, 1321 dev_name(&pdev->dev), p); 1322 if (ret) { 1323 dev_err(&pdev->dev, "unable to request irq\n"); 1324 goto err1; 1325 } 1326 1327 p->pdev = pdev; 1328 pm_runtime_enable(&pdev->dev); 1329 1330 /* Platform data may override FIFO sizes */ 1331 p->tx_fifo_size = chipdata->tx_fifo_size; 1332 p->rx_fifo_size = chipdata->rx_fifo_size; 1333 if (p->info->tx_fifo_override) 1334 p->tx_fifo_size = p->info->tx_fifo_override; 1335 if (p->info->rx_fifo_override) 1336 p->rx_fifo_size = p->info->rx_fifo_override; 1337 1338 /* init controller code */ 1339 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; 1340 ctlr->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE; 1341 clksrc = clk_get_rate(p->clk); 1342 ctlr->min_speed_hz = DIV_ROUND_UP(clksrc, 1024); 1343 ctlr->max_speed_hz = DIV_ROUND_UP(clksrc, 1 << p->min_div_pow); 1344 ctlr->flags = chipdata->ctlr_flags; 1345 ctlr->bus_num = pdev->id; 1346 ctlr->num_chipselect = p->info->num_chipselect; 1347 ctlr->dev.of_node = pdev->dev.of_node; 1348 ctlr->setup = sh_msiof_spi_setup; 1349 ctlr->prepare_message = sh_msiof_prepare_message; 1350 ctlr->slave_abort = sh_msiof_slave_abort; 1351 ctlr->bits_per_word_mask = chipdata->bits_per_word_mask; 1352 ctlr->auto_runtime_pm = true; 1353 ctlr->transfer_one = sh_msiof_transfer_one; 1354 ctlr->use_gpio_descriptors = true; 1355 ctlr->max_native_cs = MAX_SS; 1356 1357 ret = sh_msiof_request_dma(p); 1358 if (ret < 0) 1359 dev_warn(&pdev->dev, "DMA not available, using PIO\n"); 1360 1361 ret = devm_spi_register_controller(&pdev->dev, ctlr); 1362 if (ret < 0) { 1363 dev_err(&pdev->dev, "devm_spi_register_controller error.\n"); 1364 goto err2; 1365 } 1366 1367 return 0; 1368 1369 err2: 1370 sh_msiof_release_dma(p); 1371 pm_runtime_disable(&pdev->dev); 1372 err1: 1373 spi_controller_put(ctlr); 1374 return ret; 1375 } 1376 1377 static int sh_msiof_spi_remove(struct platform_device *pdev) 1378 { 1379 struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev); 1380 1381 sh_msiof_release_dma(p); 1382 pm_runtime_disable(&pdev->dev); 1383 return 0; 1384 } 1385 1386 static const struct platform_device_id spi_driver_ids[] = { 1387 { "spi_sh_msiof", (kernel_ulong_t)&sh_data }, 1388 {}, 1389 }; 1390 MODULE_DEVICE_TABLE(platform, spi_driver_ids); 1391 1392 #ifdef CONFIG_PM_SLEEP 1393 static int sh_msiof_spi_suspend(struct device *dev) 1394 { 1395 struct sh_msiof_spi_priv *p = dev_get_drvdata(dev); 1396 1397 return spi_controller_suspend(p->ctlr); 1398 } 1399 1400 static int sh_msiof_spi_resume(struct device *dev) 1401 { 1402 struct sh_msiof_spi_priv *p = dev_get_drvdata(dev); 1403 1404 return spi_controller_resume(p->ctlr); 1405 } 1406 1407 static SIMPLE_DEV_PM_OPS(sh_msiof_spi_pm_ops, sh_msiof_spi_suspend, 1408 sh_msiof_spi_resume); 1409 #define DEV_PM_OPS (&sh_msiof_spi_pm_ops) 1410 #else 1411 #define DEV_PM_OPS NULL 1412 #endif /* CONFIG_PM_SLEEP */ 1413 1414 static struct platform_driver sh_msiof_spi_drv = { 1415 .probe = sh_msiof_spi_probe, 1416 .remove = sh_msiof_spi_remove, 1417 .id_table = spi_driver_ids, 1418 .driver = { 1419 .name = "spi_sh_msiof", 1420 .pm = DEV_PM_OPS, 1421 .of_match_table = of_match_ptr(sh_msiof_match), 1422 }, 1423 }; 1424 module_platform_driver(sh_msiof_spi_drv); 1425 1426 MODULE_DESCRIPTION("SuperH MSIOF SPI Controller Interface Driver"); 1427 MODULE_AUTHOR("Magnus Damm"); 1428 MODULE_LICENSE("GPL v2"); 1429