1 /* 2 * drivers/ata/pata_mpc52xx.c 3 * 4 * libata driver for the Freescale MPC52xx on-chip IDE interface 5 * 6 * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com> 7 * Copyright (C) 2003 Mipsys - Benjamin Herrenschmidt 8 * 9 * UDMA support based on patches by Freescale (Bernard Kuhn, John Rigby), 10 * Domen Puncer and Tim Yamin. 11 * 12 * This file is licensed under the terms of the GNU General Public License 13 * version 2. This program is licensed "as is" without any warranty of any 14 * kind, whether express or implied. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/gfp.h> 20 #include <linux/delay.h> 21 #include <linux/libata.h> 22 #include <linux/of_platform.h> 23 #include <linux/types.h> 24 25 #include <asm/cacheflush.h> 26 #include <asm/prom.h> 27 #include <asm/mpc52xx.h> 28 29 #include <linux/fsl/bestcomm/bestcomm.h> 30 #include <linux/fsl/bestcomm/bestcomm_priv.h> 31 #include <linux/fsl/bestcomm/ata.h> 32 33 #define DRV_NAME "mpc52xx_ata" 34 35 /* Private structures used by the driver */ 36 struct mpc52xx_ata_timings { 37 u32 pio1; 38 u32 pio2; 39 u32 mdma1; 40 u32 mdma2; 41 u32 udma1; 42 u32 udma2; 43 u32 udma3; 44 u32 udma4; 45 u32 udma5; 46 int using_udma; 47 }; 48 49 struct mpc52xx_ata_priv { 50 unsigned int ipb_period; 51 struct mpc52xx_ata __iomem *ata_regs; 52 phys_addr_t ata_regs_pa; 53 int ata_irq; 54 struct mpc52xx_ata_timings timings[2]; 55 int csel; 56 57 /* DMA */ 58 struct bcom_task *dmatsk; 59 const struct udmaspec *udmaspec; 60 const struct mdmaspec *mdmaspec; 61 int mpc52xx_ata_dma_last_write; 62 int waiting_for_dma; 63 }; 64 65 66 /* ATAPI-4 PIO specs (in ns) */ 67 static const u16 ataspec_t0[5] = {600, 383, 240, 180, 120}; 68 static const u16 ataspec_t1[5] = { 70, 50, 30, 30, 25}; 69 static const u16 ataspec_t2_8[5] = {290, 290, 290, 80, 70}; 70 static const u16 ataspec_t2_16[5] = {165, 125, 100, 80, 70}; 71 static const u16 ataspec_t2i[5] = { 0, 0, 0, 70, 25}; 72 static const u16 ataspec_t4[5] = { 30, 20, 15, 10, 10}; 73 static const u16 ataspec_ta[5] = { 35, 35, 35, 35, 35}; 74 75 #define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c))) 76 77 /* ======================================================================== */ 78 79 /* ATAPI-4 MDMA specs (in clocks) */ 80 struct mdmaspec { 81 u8 t0M; 82 u8 td; 83 u8 th; 84 u8 tj; 85 u8 tkw; 86 u8 tm; 87 u8 tn; 88 }; 89 90 static const struct mdmaspec mdmaspec66[3] = { 91 { .t0M = 32, .td = 15, .th = 2, .tj = 2, .tkw = 15, .tm = 4, .tn = 1 }, 92 { .t0M = 10, .td = 6, .th = 1, .tj = 1, .tkw = 4, .tm = 2, .tn = 1 }, 93 { .t0M = 8, .td = 5, .th = 1, .tj = 1, .tkw = 2, .tm = 2, .tn = 1 }, 94 }; 95 96 static const struct mdmaspec mdmaspec132[3] = { 97 { .t0M = 64, .td = 29, .th = 3, .tj = 3, .tkw = 29, .tm = 7, .tn = 2 }, 98 { .t0M = 20, .td = 11, .th = 2, .tj = 1, .tkw = 7, .tm = 4, .tn = 1 }, 99 { .t0M = 16, .td = 10, .th = 2, .tj = 1, .tkw = 4, .tm = 4, .tn = 1 }, 100 }; 101 102 /* ATAPI-4 UDMA specs (in clocks) */ 103 struct udmaspec { 104 u8 tcyc; 105 u8 t2cyc; 106 u8 tds; 107 u8 tdh; 108 u8 tdvs; 109 u8 tdvh; 110 u8 tfs; 111 u8 tli; 112 u8 tmli; 113 u8 taz; 114 u8 tzah; 115 u8 tenv; 116 u8 tsr; 117 u8 trfs; 118 u8 trp; 119 u8 tack; 120 u8 tss; 121 }; 122 123 static const struct udmaspec udmaspec66[6] = { 124 { .tcyc = 8, .t2cyc = 16, .tds = 1, .tdh = 1, .tdvs = 5, .tdvh = 1, 125 .tfs = 16, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 126 .tsr = 3, .trfs = 5, .trp = 11, .tack = 2, .tss = 4, 127 }, 128 { .tcyc = 5, .t2cyc = 11, .tds = 1, .tdh = 1, .tdvs = 4, .tdvh = 1, 129 .tfs = 14, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 130 .tsr = 2, .trfs = 5, .trp = 9, .tack = 2, .tss = 4, 131 }, 132 { .tcyc = 4, .t2cyc = 8, .tds = 1, .tdh = 1, .tdvs = 3, .tdvh = 1, 133 .tfs = 12, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 134 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4, 135 }, 136 { .tcyc = 3, .t2cyc = 6, .tds = 1, .tdh = 1, .tdvs = 2, .tdvh = 1, 137 .tfs = 9, .tli = 7, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 138 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4, 139 }, 140 { .tcyc = 2, .t2cyc = 4, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1, 141 .tfs = 8, .tli = 8, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 142 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4, 143 }, 144 { .tcyc = 2, .t2cyc = 2, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1, 145 .tfs = 6, .tli = 5, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 146 .tsr = 2, .trfs = 4, .trp = 6, .tack = 2, .tss = 4, 147 }, 148 }; 149 150 static const struct udmaspec udmaspec132[6] = { 151 { .tcyc = 15, .t2cyc = 31, .tds = 2, .tdh = 1, .tdvs = 10, .tdvh = 1, 152 .tfs = 30, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3, 153 .tsr = 7, .trfs = 10, .trp = 22, .tack = 3, .tss = 7, 154 }, 155 { .tcyc = 10, .t2cyc = 21, .tds = 2, .tdh = 1, .tdvs = 7, .tdvh = 1, 156 .tfs = 27, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3, 157 .tsr = 4, .trfs = 10, .trp = 17, .tack = 3, .tss = 7, 158 }, 159 { .tcyc = 6, .t2cyc = 12, .tds = 1, .tdh = 1, .tdvs = 5, .tdvh = 1, 160 .tfs = 23, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3, 161 .tsr = 3, .trfs = 8, .trp = 14, .tack = 3, .tss = 7, 162 }, 163 { .tcyc = 7, .t2cyc = 12, .tds = 1, .tdh = 1, .tdvs = 3, .tdvh = 1, 164 .tfs = 15, .tli = 13, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3, 165 .tsr = 3, .trfs = 8, .trp = 14, .tack = 3, .tss = 7, 166 }, 167 { .tcyc = 2, .t2cyc = 5, .tds = 0, .tdh = 0, .tdvs = 1, .tdvh = 1, 168 .tfs = 16, .tli = 14, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2, 169 .tsr = 2, .trfs = 7, .trp = 13, .tack = 2, .tss = 6, 170 }, 171 { .tcyc = 3, .t2cyc = 6, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1, 172 .tfs = 12, .tli = 10, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3, 173 .tsr = 3, .trfs = 7, .trp = 12, .tack = 3, .tss = 7, 174 }, 175 }; 176 177 /* ======================================================================== */ 178 179 /* Bit definitions inside the registers */ 180 #define MPC52xx_ATA_HOSTCONF_SMR 0x80000000UL /* State machine reset */ 181 #define MPC52xx_ATA_HOSTCONF_FR 0x40000000UL /* FIFO Reset */ 182 #define MPC52xx_ATA_HOSTCONF_IE 0x02000000UL /* Enable interrupt in PIO */ 183 #define MPC52xx_ATA_HOSTCONF_IORDY 0x01000000UL /* Drive supports IORDY protocol */ 184 185 #define MPC52xx_ATA_HOSTSTAT_TIP 0x80000000UL /* Transaction in progress */ 186 #define MPC52xx_ATA_HOSTSTAT_UREP 0x40000000UL /* UDMA Read Extended Pause */ 187 #define MPC52xx_ATA_HOSTSTAT_RERR 0x02000000UL /* Read Error */ 188 #define MPC52xx_ATA_HOSTSTAT_WERR 0x01000000UL /* Write Error */ 189 190 #define MPC52xx_ATA_FIFOSTAT_EMPTY 0x01 /* FIFO Empty */ 191 #define MPC52xx_ATA_FIFOSTAT_ERROR 0x40 /* FIFO Error */ 192 193 #define MPC52xx_ATA_DMAMODE_WRITE 0x01 /* Write DMA */ 194 #define MPC52xx_ATA_DMAMODE_READ 0x02 /* Read DMA */ 195 #define MPC52xx_ATA_DMAMODE_UDMA 0x04 /* UDMA enabled */ 196 #define MPC52xx_ATA_DMAMODE_IE 0x08 /* Enable drive interrupt to CPU in DMA mode */ 197 #define MPC52xx_ATA_DMAMODE_FE 0x10 /* FIFO Flush enable in Rx mode */ 198 #define MPC52xx_ATA_DMAMODE_FR 0x20 /* FIFO Reset */ 199 #define MPC52xx_ATA_DMAMODE_HUT 0x40 /* Host UDMA burst terminate */ 200 201 #define MAX_DMA_BUFFERS 128 202 #define MAX_DMA_BUFFER_SIZE 0x20000u 203 204 /* Structure of the hardware registers */ 205 struct mpc52xx_ata { 206 207 /* Host interface registers */ 208 u32 config; /* ATA + 0x00 Host configuration */ 209 u32 host_status; /* ATA + 0x04 Host controller status */ 210 u32 pio1; /* ATA + 0x08 PIO Timing 1 */ 211 u32 pio2; /* ATA + 0x0c PIO Timing 2 */ 212 u32 mdma1; /* ATA + 0x10 MDMA Timing 1 */ 213 u32 mdma2; /* ATA + 0x14 MDMA Timing 2 */ 214 u32 udma1; /* ATA + 0x18 UDMA Timing 1 */ 215 u32 udma2; /* ATA + 0x1c UDMA Timing 2 */ 216 u32 udma3; /* ATA + 0x20 UDMA Timing 3 */ 217 u32 udma4; /* ATA + 0x24 UDMA Timing 4 */ 218 u32 udma5; /* ATA + 0x28 UDMA Timing 5 */ 219 u32 share_cnt; /* ATA + 0x2c ATA share counter */ 220 u32 reserved0[3]; 221 222 /* FIFO registers */ 223 u32 fifo_data; /* ATA + 0x3c */ 224 u8 fifo_status_frame; /* ATA + 0x40 */ 225 u8 fifo_status; /* ATA + 0x41 */ 226 u16 reserved7[1]; 227 u8 fifo_control; /* ATA + 0x44 */ 228 u8 reserved8[5]; 229 u16 fifo_alarm; /* ATA + 0x4a */ 230 u16 reserved9; 231 u16 fifo_rdp; /* ATA + 0x4e */ 232 u16 reserved10; 233 u16 fifo_wrp; /* ATA + 0x52 */ 234 u16 reserved11; 235 u16 fifo_lfrdp; /* ATA + 0x56 */ 236 u16 reserved12; 237 u16 fifo_lfwrp; /* ATA + 0x5a */ 238 239 /* Drive TaskFile registers */ 240 u8 tf_control; /* ATA + 0x5c TASKFILE Control/Alt Status */ 241 u8 reserved13[3]; 242 u16 tf_data; /* ATA + 0x60 TASKFILE Data */ 243 u16 reserved14; 244 u8 tf_features; /* ATA + 0x64 TASKFILE Features/Error */ 245 u8 reserved15[3]; 246 u8 tf_sec_count; /* ATA + 0x68 TASKFILE Sector Count */ 247 u8 reserved16[3]; 248 u8 tf_sec_num; /* ATA + 0x6c TASKFILE Sector Number */ 249 u8 reserved17[3]; 250 u8 tf_cyl_low; /* ATA + 0x70 TASKFILE Cylinder Low */ 251 u8 reserved18[3]; 252 u8 tf_cyl_high; /* ATA + 0x74 TASKFILE Cylinder High */ 253 u8 reserved19[3]; 254 u8 tf_dev_head; /* ATA + 0x78 TASKFILE Device/Head */ 255 u8 reserved20[3]; 256 u8 tf_command; /* ATA + 0x7c TASKFILE Command/Status */ 257 u8 dma_mode; /* ATA + 0x7d ATA Host DMA Mode configuration */ 258 u8 reserved21[2]; 259 }; 260 261 262 /* ======================================================================== */ 263 /* Aux fns */ 264 /* ======================================================================== */ 265 266 267 /* MPC52xx low level hw control */ 268 static int 269 mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv *priv, int dev, int pio) 270 { 271 struct mpc52xx_ata_timings *timing = &priv->timings[dev]; 272 unsigned int ipb_period = priv->ipb_period; 273 u32 t0, t1, t2_8, t2_16, t2i, t4, ta; 274 275 if ((pio < 0) || (pio > 4)) 276 return -EINVAL; 277 278 t0 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t0[pio]); 279 t1 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t1[pio]); 280 t2_8 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_8[pio]); 281 t2_16 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_16[pio]); 282 t2i = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2i[pio]); 283 t4 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t4[pio]); 284 ta = CALC_CLKCYC(ipb_period, 1000 * ataspec_ta[pio]); 285 286 timing->pio1 = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8) | (t2i); 287 timing->pio2 = (t4 << 24) | (t1 << 16) | (ta << 8); 288 289 return 0; 290 } 291 292 static int 293 mpc52xx_ata_compute_mdma_timings(struct mpc52xx_ata_priv *priv, int dev, 294 int speed) 295 { 296 struct mpc52xx_ata_timings *t = &priv->timings[dev]; 297 const struct mdmaspec *s = &priv->mdmaspec[speed]; 298 299 if (speed < 0 || speed > 2) 300 return -EINVAL; 301 302 t->mdma1 = ((u32)s->t0M << 24) | ((u32)s->td << 16) | ((u32)s->tkw << 8) | s->tm; 303 t->mdma2 = ((u32)s->th << 24) | ((u32)s->tj << 16) | ((u32)s->tn << 8); 304 t->using_udma = 0; 305 306 return 0; 307 } 308 309 static int 310 mpc52xx_ata_compute_udma_timings(struct mpc52xx_ata_priv *priv, int dev, 311 int speed) 312 { 313 struct mpc52xx_ata_timings *t = &priv->timings[dev]; 314 const struct udmaspec *s = &priv->udmaspec[speed]; 315 316 if (speed < 0 || speed > 2) 317 return -EINVAL; 318 319 t->udma1 = ((u32)s->t2cyc << 24) | ((u32)s->tcyc << 16) | ((u32)s->tds << 8) | s->tdh; 320 t->udma2 = ((u32)s->tdvs << 24) | ((u32)s->tdvh << 16) | ((u32)s->tfs << 8) | s->tli; 321 t->udma3 = ((u32)s->tmli << 24) | ((u32)s->taz << 16) | ((u32)s->tenv << 8) | s->tsr; 322 t->udma4 = ((u32)s->tss << 24) | ((u32)s->trfs << 16) | ((u32)s->trp << 8) | s->tack; 323 t->udma5 = (u32)s->tzah << 24; 324 t->using_udma = 1; 325 326 return 0; 327 } 328 329 static void 330 mpc52xx_ata_apply_timings(struct mpc52xx_ata_priv *priv, int device) 331 { 332 struct mpc52xx_ata __iomem *regs = priv->ata_regs; 333 struct mpc52xx_ata_timings *timing = &priv->timings[device]; 334 335 out_be32(®s->pio1, timing->pio1); 336 out_be32(®s->pio2, timing->pio2); 337 out_be32(®s->mdma1, timing->mdma1); 338 out_be32(®s->mdma2, timing->mdma2); 339 out_be32(®s->udma1, timing->udma1); 340 out_be32(®s->udma2, timing->udma2); 341 out_be32(®s->udma3, timing->udma3); 342 out_be32(®s->udma4, timing->udma4); 343 out_be32(®s->udma5, timing->udma5); 344 priv->csel = device; 345 } 346 347 static int 348 mpc52xx_ata_hw_init(struct mpc52xx_ata_priv *priv) 349 { 350 struct mpc52xx_ata __iomem *regs = priv->ata_regs; 351 int tslot; 352 353 /* Clear share_cnt (all sample code do this ...) */ 354 out_be32(®s->share_cnt, 0); 355 356 /* Configure and reset host */ 357 out_be32(®s->config, 358 MPC52xx_ATA_HOSTCONF_IE | 359 MPC52xx_ATA_HOSTCONF_IORDY | 360 MPC52xx_ATA_HOSTCONF_SMR | 361 MPC52xx_ATA_HOSTCONF_FR); 362 363 udelay(10); 364 365 out_be32(®s->config, 366 MPC52xx_ATA_HOSTCONF_IE | 367 MPC52xx_ATA_HOSTCONF_IORDY); 368 369 /* Set the time slot to 1us */ 370 tslot = CALC_CLKCYC(priv->ipb_period, 1000000); 371 out_be32(®s->share_cnt, tslot << 16); 372 373 /* Init timings to PIO0 */ 374 memset(priv->timings, 0x00, 2*sizeof(struct mpc52xx_ata_timings)); 375 376 mpc52xx_ata_compute_pio_timings(priv, 0, 0); 377 mpc52xx_ata_compute_pio_timings(priv, 1, 0); 378 379 mpc52xx_ata_apply_timings(priv, 0); 380 381 return 0; 382 } 383 384 385 /* ======================================================================== */ 386 /* libata driver */ 387 /* ======================================================================== */ 388 389 static void 390 mpc52xx_ata_set_piomode(struct ata_port *ap, struct ata_device *adev) 391 { 392 struct mpc52xx_ata_priv *priv = ap->host->private_data; 393 int pio, rv; 394 395 pio = adev->pio_mode - XFER_PIO_0; 396 397 rv = mpc52xx_ata_compute_pio_timings(priv, adev->devno, pio); 398 399 if (rv) { 400 dev_err(ap->dev, "error: invalid PIO mode: %d\n", pio); 401 return; 402 } 403 404 mpc52xx_ata_apply_timings(priv, adev->devno); 405 } 406 407 static void 408 mpc52xx_ata_set_dmamode(struct ata_port *ap, struct ata_device *adev) 409 { 410 struct mpc52xx_ata_priv *priv = ap->host->private_data; 411 int rv; 412 413 if (adev->dma_mode >= XFER_UDMA_0) { 414 int dma = adev->dma_mode - XFER_UDMA_0; 415 rv = mpc52xx_ata_compute_udma_timings(priv, adev->devno, dma); 416 } else { 417 int dma = adev->dma_mode - XFER_MW_DMA_0; 418 rv = mpc52xx_ata_compute_mdma_timings(priv, adev->devno, dma); 419 } 420 421 if (rv) { 422 dev_alert(ap->dev, 423 "Trying to select invalid DMA mode %d\n", 424 adev->dma_mode); 425 return; 426 } 427 428 mpc52xx_ata_apply_timings(priv, adev->devno); 429 } 430 431 static void 432 mpc52xx_ata_dev_select(struct ata_port *ap, unsigned int device) 433 { 434 struct mpc52xx_ata_priv *priv = ap->host->private_data; 435 436 if (device != priv->csel) 437 mpc52xx_ata_apply_timings(priv, device); 438 439 ata_sff_dev_select(ap, device); 440 } 441 442 static int 443 mpc52xx_ata_build_dmatable(struct ata_queued_cmd *qc) 444 { 445 struct ata_port *ap = qc->ap; 446 struct mpc52xx_ata_priv *priv = ap->host->private_data; 447 struct bcom_ata_bd *bd; 448 unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE), si; 449 struct scatterlist *sg; 450 int count = 0; 451 452 if (read) 453 bcom_ata_rx_prepare(priv->dmatsk); 454 else 455 bcom_ata_tx_prepare(priv->dmatsk); 456 457 for_each_sg(qc->sg, sg, qc->n_elem, si) { 458 dma_addr_t cur_addr = sg_dma_address(sg); 459 u32 cur_len = sg_dma_len(sg); 460 461 while (cur_len) { 462 unsigned int tc = min(cur_len, MAX_DMA_BUFFER_SIZE); 463 bd = (struct bcom_ata_bd *) 464 bcom_prepare_next_buffer(priv->dmatsk); 465 466 if (read) { 467 bd->status = tc; 468 bd->src_pa = (__force u32) priv->ata_regs_pa + 469 offsetof(struct mpc52xx_ata, fifo_data); 470 bd->dst_pa = (__force u32) cur_addr; 471 } else { 472 bd->status = tc; 473 bd->src_pa = (__force u32) cur_addr; 474 bd->dst_pa = (__force u32) priv->ata_regs_pa + 475 offsetof(struct mpc52xx_ata, fifo_data); 476 } 477 478 bcom_submit_next_buffer(priv->dmatsk, NULL); 479 480 cur_addr += tc; 481 cur_len -= tc; 482 count++; 483 484 if (count > MAX_DMA_BUFFERS) { 485 dev_alert(ap->dev, "dma table" 486 "too small\n"); 487 goto use_pio_instead; 488 } 489 } 490 } 491 return 1; 492 493 use_pio_instead: 494 bcom_ata_reset_bd(priv->dmatsk); 495 return 0; 496 } 497 498 static void 499 mpc52xx_bmdma_setup(struct ata_queued_cmd *qc) 500 { 501 struct ata_port *ap = qc->ap; 502 struct mpc52xx_ata_priv *priv = ap->host->private_data; 503 struct mpc52xx_ata __iomem *regs = priv->ata_regs; 504 505 unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE); 506 u8 dma_mode; 507 508 if (!mpc52xx_ata_build_dmatable(qc)) 509 dev_alert(ap->dev, "%s: %i, return 1?\n", 510 __func__, __LINE__); 511 512 /* Check FIFO is OK... */ 513 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR) 514 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n", 515 __func__, in_8(&priv->ata_regs->fifo_status)); 516 517 if (read) { 518 dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_READ | 519 MPC52xx_ATA_DMAMODE_FE; 520 521 /* Setup FIFO if direction changed */ 522 if (priv->mpc52xx_ata_dma_last_write != 0) { 523 priv->mpc52xx_ata_dma_last_write = 0; 524 525 /* Configure FIFO with granularity to 7 */ 526 out_8(®s->fifo_control, 7); 527 out_be16(®s->fifo_alarm, 128); 528 529 /* Set FIFO Reset bit (FR) */ 530 out_8(®s->dma_mode, MPC52xx_ATA_DMAMODE_FR); 531 } 532 } else { 533 dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_WRITE; 534 535 /* Setup FIFO if direction changed */ 536 if (priv->mpc52xx_ata_dma_last_write != 1) { 537 priv->mpc52xx_ata_dma_last_write = 1; 538 539 /* Configure FIFO with granularity to 4 */ 540 out_8(®s->fifo_control, 4); 541 out_be16(®s->fifo_alarm, 128); 542 } 543 } 544 545 if (priv->timings[qc->dev->devno].using_udma) 546 dma_mode |= MPC52xx_ATA_DMAMODE_UDMA; 547 548 out_8(®s->dma_mode, dma_mode); 549 priv->waiting_for_dma = ATA_DMA_ACTIVE; 550 551 ata_wait_idle(ap); 552 ap->ops->sff_exec_command(ap, &qc->tf); 553 } 554 555 static void 556 mpc52xx_bmdma_start(struct ata_queued_cmd *qc) 557 { 558 struct ata_port *ap = qc->ap; 559 struct mpc52xx_ata_priv *priv = ap->host->private_data; 560 561 bcom_set_task_auto_start(priv->dmatsk->tasknum, priv->dmatsk->tasknum); 562 bcom_enable(priv->dmatsk); 563 } 564 565 static void 566 mpc52xx_bmdma_stop(struct ata_queued_cmd *qc) 567 { 568 struct ata_port *ap = qc->ap; 569 struct mpc52xx_ata_priv *priv = ap->host->private_data; 570 571 bcom_disable(priv->dmatsk); 572 bcom_ata_reset_bd(priv->dmatsk); 573 priv->waiting_for_dma = 0; 574 575 /* Check FIFO is OK... */ 576 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR) 577 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n", 578 __func__, in_8(&priv->ata_regs->fifo_status)); 579 } 580 581 static u8 582 mpc52xx_bmdma_status(struct ata_port *ap) 583 { 584 struct mpc52xx_ata_priv *priv = ap->host->private_data; 585 586 /* Check FIFO is OK... */ 587 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR) { 588 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n", 589 __func__, in_8(&priv->ata_regs->fifo_status)); 590 return priv->waiting_for_dma | ATA_DMA_ERR; 591 } 592 593 return priv->waiting_for_dma; 594 } 595 596 static irqreturn_t 597 mpc52xx_ata_task_irq(int irq, void *vpriv) 598 { 599 struct mpc52xx_ata_priv *priv = vpriv; 600 while (bcom_buffer_done(priv->dmatsk)) 601 bcom_retrieve_buffer(priv->dmatsk, NULL, NULL); 602 603 priv->waiting_for_dma |= ATA_DMA_INTR; 604 605 return IRQ_HANDLED; 606 } 607 608 static struct scsi_host_template mpc52xx_ata_sht = { 609 ATA_PIO_SHT(DRV_NAME), 610 }; 611 612 static struct ata_port_operations mpc52xx_ata_port_ops = { 613 .inherits = &ata_bmdma_port_ops, 614 .sff_dev_select = mpc52xx_ata_dev_select, 615 .set_piomode = mpc52xx_ata_set_piomode, 616 .set_dmamode = mpc52xx_ata_set_dmamode, 617 .bmdma_setup = mpc52xx_bmdma_setup, 618 .bmdma_start = mpc52xx_bmdma_start, 619 .bmdma_stop = mpc52xx_bmdma_stop, 620 .bmdma_status = mpc52xx_bmdma_status, 621 .qc_prep = ata_noop_qc_prep, 622 }; 623 624 static int mpc52xx_ata_init_one(struct device *dev, 625 struct mpc52xx_ata_priv *priv, 626 unsigned long raw_ata_regs, 627 int mwdma_mask, int udma_mask) 628 { 629 struct ata_host *host; 630 struct ata_port *ap; 631 struct ata_ioports *aio; 632 633 host = ata_host_alloc(dev, 1); 634 if (!host) 635 return -ENOMEM; 636 637 ap = host->ports[0]; 638 ap->flags |= ATA_FLAG_SLAVE_POSS; 639 ap->pio_mask = ATA_PIO4; 640 ap->mwdma_mask = mwdma_mask; 641 ap->udma_mask = udma_mask; 642 ap->ops = &mpc52xx_ata_port_ops; 643 host->private_data = priv; 644 645 aio = &ap->ioaddr; 646 aio->cmd_addr = NULL; /* Don't have a classic reg block */ 647 aio->altstatus_addr = &priv->ata_regs->tf_control; 648 aio->ctl_addr = &priv->ata_regs->tf_control; 649 aio->data_addr = &priv->ata_regs->tf_data; 650 aio->error_addr = &priv->ata_regs->tf_features; 651 aio->feature_addr = &priv->ata_regs->tf_features; 652 aio->nsect_addr = &priv->ata_regs->tf_sec_count; 653 aio->lbal_addr = &priv->ata_regs->tf_sec_num; 654 aio->lbam_addr = &priv->ata_regs->tf_cyl_low; 655 aio->lbah_addr = &priv->ata_regs->tf_cyl_high; 656 aio->device_addr = &priv->ata_regs->tf_dev_head; 657 aio->status_addr = &priv->ata_regs->tf_command; 658 aio->command_addr = &priv->ata_regs->tf_command; 659 660 ata_port_desc(ap, "ata_regs 0x%lx", raw_ata_regs); 661 662 /* activate host */ 663 return ata_host_activate(host, priv->ata_irq, ata_bmdma_interrupt, 0, 664 &mpc52xx_ata_sht); 665 } 666 667 /* ======================================================================== */ 668 /* OF Platform driver */ 669 /* ======================================================================== */ 670 671 static int mpc52xx_ata_probe(struct platform_device *op) 672 { 673 unsigned int ipb_freq; 674 struct resource res_mem; 675 int ata_irq = 0; 676 struct mpc52xx_ata __iomem *ata_regs; 677 struct mpc52xx_ata_priv *priv = NULL; 678 int rv, task_irq; 679 int mwdma_mask = 0, udma_mask = 0; 680 const __be32 *prop; 681 int proplen; 682 struct bcom_task *dmatsk; 683 684 /* Get ipb frequency */ 685 ipb_freq = mpc5xxx_get_bus_frequency(op->dev.of_node); 686 if (!ipb_freq) { 687 dev_err(&op->dev, "could not determine IPB bus frequency\n"); 688 return -ENODEV; 689 } 690 691 /* Get device base address from device tree, request the region 692 * and ioremap it. */ 693 rv = of_address_to_resource(op->dev.of_node, 0, &res_mem); 694 if (rv) { 695 dev_err(&op->dev, "could not determine device base address\n"); 696 return rv; 697 } 698 699 if (!devm_request_mem_region(&op->dev, res_mem.start, 700 sizeof(*ata_regs), DRV_NAME)) { 701 dev_err(&op->dev, "error requesting register region\n"); 702 return -EBUSY; 703 } 704 705 ata_regs = devm_ioremap(&op->dev, res_mem.start, sizeof(*ata_regs)); 706 if (!ata_regs) { 707 dev_err(&op->dev, "error mapping device registers\n"); 708 return -ENOMEM; 709 } 710 711 /* 712 * By default, all DMA modes are disabled for the MPC5200. Some 713 * boards don't have the required signals routed to make DMA work. 714 * Also, the MPC5200B has a silicon bug that causes data corruption 715 * with UDMA if it is used at the same time as the LocalPlus bus. 716 * 717 * Instead of trying to guess what modes are usable, check the 718 * ATA device tree node to find out what DMA modes work on the board. 719 * UDMA/MWDMA modes can also be forced by adding "libata.force=<mode>" 720 * to the kernel boot parameters. 721 * 722 * The MPC5200 ATA controller supports MWDMA modes 0, 1 and 2 and 723 * UDMA modes 0, 1 and 2. 724 */ 725 prop = of_get_property(op->dev.of_node, "mwdma-mode", &proplen); 726 if ((prop) && (proplen >= 4)) 727 mwdma_mask = ATA_MWDMA2 & ((1 << (*prop + 1)) - 1); 728 prop = of_get_property(op->dev.of_node, "udma-mode", &proplen); 729 if ((prop) && (proplen >= 4)) 730 udma_mask = ATA_UDMA2 & ((1 << (*prop + 1)) - 1); 731 732 ata_irq = irq_of_parse_and_map(op->dev.of_node, 0); 733 if (ata_irq == NO_IRQ) { 734 dev_err(&op->dev, "error mapping irq\n"); 735 return -EINVAL; 736 } 737 738 /* Prepare our private structure */ 739 priv = devm_kzalloc(&op->dev, sizeof(*priv), GFP_ATOMIC); 740 if (!priv) { 741 rv = -ENOMEM; 742 goto err1; 743 } 744 745 priv->ipb_period = 1000000000 / (ipb_freq / 1000); 746 priv->ata_regs = ata_regs; 747 priv->ata_regs_pa = res_mem.start; 748 priv->ata_irq = ata_irq; 749 priv->csel = -1; 750 priv->mpc52xx_ata_dma_last_write = -1; 751 752 if (ipb_freq/1000000 == 66) { 753 priv->mdmaspec = mdmaspec66; 754 priv->udmaspec = udmaspec66; 755 } else { 756 priv->mdmaspec = mdmaspec132; 757 priv->udmaspec = udmaspec132; 758 } 759 760 /* Allocate a BestComm task for DMA */ 761 dmatsk = bcom_ata_init(MAX_DMA_BUFFERS, MAX_DMA_BUFFER_SIZE); 762 if (!dmatsk) { 763 dev_err(&op->dev, "bestcomm initialization failed\n"); 764 rv = -ENOMEM; 765 goto err1; 766 } 767 768 task_irq = bcom_get_task_irq(dmatsk); 769 rv = devm_request_irq(&op->dev, task_irq, &mpc52xx_ata_task_irq, 0, 770 "ATA task", priv); 771 if (rv) { 772 dev_err(&op->dev, "error requesting DMA IRQ\n"); 773 goto err2; 774 } 775 priv->dmatsk = dmatsk; 776 777 /* Init the hw */ 778 rv = mpc52xx_ata_hw_init(priv); 779 if (rv) { 780 dev_err(&op->dev, "error initializing hardware\n"); 781 goto err2; 782 } 783 784 /* Register ourselves to libata */ 785 rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start, 786 mwdma_mask, udma_mask); 787 if (rv) { 788 dev_err(&op->dev, "error registering with ATA layer\n"); 789 goto err2; 790 } 791 792 return 0; 793 794 err2: 795 irq_dispose_mapping(task_irq); 796 bcom_ata_release(dmatsk); 797 err1: 798 irq_dispose_mapping(ata_irq); 799 return rv; 800 } 801 802 static int 803 mpc52xx_ata_remove(struct platform_device *op) 804 { 805 struct ata_host *host = platform_get_drvdata(op); 806 struct mpc52xx_ata_priv *priv = host->private_data; 807 int task_irq; 808 809 /* Deregister the ATA interface */ 810 ata_platform_remove_one(op); 811 812 /* Clean up DMA */ 813 task_irq = bcom_get_task_irq(priv->dmatsk); 814 irq_dispose_mapping(task_irq); 815 bcom_ata_release(priv->dmatsk); 816 irq_dispose_mapping(priv->ata_irq); 817 818 return 0; 819 } 820 821 #ifdef CONFIG_PM_SLEEP 822 static int 823 mpc52xx_ata_suspend(struct platform_device *op, pm_message_t state) 824 { 825 struct ata_host *host = platform_get_drvdata(op); 826 827 return ata_host_suspend(host, state); 828 } 829 830 static int 831 mpc52xx_ata_resume(struct platform_device *op) 832 { 833 struct ata_host *host = platform_get_drvdata(op); 834 struct mpc52xx_ata_priv *priv = host->private_data; 835 int rv; 836 837 rv = mpc52xx_ata_hw_init(priv); 838 if (rv) { 839 dev_err(host->dev, "error initializing hardware\n"); 840 return rv; 841 } 842 843 ata_host_resume(host); 844 845 return 0; 846 } 847 #endif 848 849 static const struct of_device_id mpc52xx_ata_of_match[] = { 850 { .compatible = "fsl,mpc5200-ata", }, 851 { .compatible = "mpc5200-ata", }, 852 {}, 853 }; 854 855 856 static struct platform_driver mpc52xx_ata_of_platform_driver = { 857 .probe = mpc52xx_ata_probe, 858 .remove = mpc52xx_ata_remove, 859 #ifdef CONFIG_PM_SLEEP 860 .suspend = mpc52xx_ata_suspend, 861 .resume = mpc52xx_ata_resume, 862 #endif 863 .driver = { 864 .name = DRV_NAME, 865 .of_match_table = mpc52xx_ata_of_match, 866 }, 867 }; 868 869 module_platform_driver(mpc52xx_ata_of_platform_driver); 870 871 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>"); 872 MODULE_DESCRIPTION("Freescale MPC52xx IDE/ATA libata driver"); 873 MODULE_LICENSE("GPL"); 874 MODULE_DEVICE_TABLE(of, mpc52xx_ata_of_match); 875 876