1 /* 2 * linux/arch/arm/common/sa1111.c 3 * 4 * SA1111 support 5 * 6 * Original code by John Dorsey 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This file contains all generic SA1111 support. 13 * 14 * All initialization functions provided here are intended to be called 15 * from machine specific code with proper arguments when required. 16 */ 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/irq.h> 20 #include <linux/kernel.h> 21 #include <linux/delay.h> 22 #include <linux/errno.h> 23 #include <linux/ioport.h> 24 #include <linux/platform_device.h> 25 #include <linux/slab.h> 26 #include <linux/spinlock.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/clk.h> 29 #include <linux/io.h> 30 31 #include <mach/hardware.h> 32 #include <asm/mach/irq.h> 33 #include <asm/mach-types.h> 34 #include <asm/sizes.h> 35 36 #include <asm/hardware/sa1111.h> 37 38 /* SA1111 IRQs */ 39 #define IRQ_GPAIN0 (0) 40 #define IRQ_GPAIN1 (1) 41 #define IRQ_GPAIN2 (2) 42 #define IRQ_GPAIN3 (3) 43 #define IRQ_GPBIN0 (4) 44 #define IRQ_GPBIN1 (5) 45 #define IRQ_GPBIN2 (6) 46 #define IRQ_GPBIN3 (7) 47 #define IRQ_GPBIN4 (8) 48 #define IRQ_GPBIN5 (9) 49 #define IRQ_GPCIN0 (10) 50 #define IRQ_GPCIN1 (11) 51 #define IRQ_GPCIN2 (12) 52 #define IRQ_GPCIN3 (13) 53 #define IRQ_GPCIN4 (14) 54 #define IRQ_GPCIN5 (15) 55 #define IRQ_GPCIN6 (16) 56 #define IRQ_GPCIN7 (17) 57 #define IRQ_MSTXINT (18) 58 #define IRQ_MSRXINT (19) 59 #define IRQ_MSSTOPERRINT (20) 60 #define IRQ_TPTXINT (21) 61 #define IRQ_TPRXINT (22) 62 #define IRQ_TPSTOPERRINT (23) 63 #define SSPXMTINT (24) 64 #define SSPRCVINT (25) 65 #define SSPROR (26) 66 #define AUDXMTDMADONEA (32) 67 #define AUDRCVDMADONEA (33) 68 #define AUDXMTDMADONEB (34) 69 #define AUDRCVDMADONEB (35) 70 #define AUDTFSR (36) 71 #define AUDRFSR (37) 72 #define AUDTUR (38) 73 #define AUDROR (39) 74 #define AUDDTS (40) 75 #define AUDRDD (41) 76 #define AUDSTO (42) 77 #define IRQ_USBPWR (43) 78 #define IRQ_HCIM (44) 79 #define IRQ_HCIBUFFACC (45) 80 #define IRQ_HCIRMTWKP (46) 81 #define IRQ_NHCIMFCIR (47) 82 #define IRQ_USB_PORT_RESUME (48) 83 #define IRQ_S0_READY_NINT (49) 84 #define IRQ_S1_READY_NINT (50) 85 #define IRQ_S0_CD_VALID (51) 86 #define IRQ_S1_CD_VALID (52) 87 #define IRQ_S0_BVD1_STSCHG (53) 88 #define IRQ_S1_BVD1_STSCHG (54) 89 #define SA1111_IRQ_NR (55) 90 91 extern void sa1110_mb_enable(void); 92 extern void sa1110_mb_disable(void); 93 94 /* 95 * We keep the following data for the overall SA1111. Note that the 96 * struct device and struct resource are "fake"; they should be supplied 97 * by the bus above us. However, in the interests of getting all SA1111 98 * drivers converted over to the device model, we provide this as an 99 * anchor point for all the other drivers. 100 */ 101 struct sa1111 { 102 struct device *dev; 103 struct clk *clk; 104 unsigned long phys; 105 int irq; 106 int irq_base; /* base for cascaded on-chip IRQs */ 107 spinlock_t lock; 108 void __iomem *base; 109 struct sa1111_platform_data *pdata; 110 #ifdef CONFIG_PM 111 void *saved_state; 112 #endif 113 }; 114 115 /* 116 * We _really_ need to eliminate this. Its only users 117 * are the PWM and DMA checking code. 118 */ 119 static struct sa1111 *g_sa1111; 120 121 struct sa1111_dev_info { 122 unsigned long offset; 123 unsigned long skpcr_mask; 124 bool dma; 125 unsigned int devid; 126 unsigned int irq[6]; 127 }; 128 129 static struct sa1111_dev_info sa1111_devices[] = { 130 { 131 .offset = SA1111_USB, 132 .skpcr_mask = SKPCR_UCLKEN, 133 .dma = true, 134 .devid = SA1111_DEVID_USB, 135 .irq = { 136 IRQ_USBPWR, 137 IRQ_HCIM, 138 IRQ_HCIBUFFACC, 139 IRQ_HCIRMTWKP, 140 IRQ_NHCIMFCIR, 141 IRQ_USB_PORT_RESUME 142 }, 143 }, 144 { 145 .offset = 0x0600, 146 .skpcr_mask = SKPCR_I2SCLKEN | SKPCR_L3CLKEN, 147 .dma = true, 148 .devid = SA1111_DEVID_SAC, 149 .irq = { 150 AUDXMTDMADONEA, 151 AUDXMTDMADONEB, 152 AUDRCVDMADONEA, 153 AUDRCVDMADONEB 154 }, 155 }, 156 { 157 .offset = 0x0800, 158 .skpcr_mask = SKPCR_SCLKEN, 159 .devid = SA1111_DEVID_SSP, 160 }, 161 { 162 .offset = SA1111_KBD, 163 .skpcr_mask = SKPCR_PTCLKEN, 164 .devid = SA1111_DEVID_PS2_KBD, 165 .irq = { 166 IRQ_TPRXINT, 167 IRQ_TPTXINT 168 }, 169 }, 170 { 171 .offset = SA1111_MSE, 172 .skpcr_mask = SKPCR_PMCLKEN, 173 .devid = SA1111_DEVID_PS2_MSE, 174 .irq = { 175 IRQ_MSRXINT, 176 IRQ_MSTXINT 177 }, 178 }, 179 { 180 .offset = 0x1800, 181 .skpcr_mask = 0, 182 .devid = SA1111_DEVID_PCMCIA, 183 .irq = { 184 IRQ_S0_READY_NINT, 185 IRQ_S0_CD_VALID, 186 IRQ_S0_BVD1_STSCHG, 187 IRQ_S1_READY_NINT, 188 IRQ_S1_CD_VALID, 189 IRQ_S1_BVD1_STSCHG, 190 }, 191 }, 192 }; 193 194 /* 195 * SA1111 interrupt support. Since clearing an IRQ while there are 196 * active IRQs causes the interrupt output to pulse, the upper levels 197 * will call us again if there are more interrupts to process. 198 */ 199 static void sa1111_irq_handler(struct irq_desc *desc) 200 { 201 unsigned int stat0, stat1, i; 202 struct sa1111 *sachip = irq_desc_get_handler_data(desc); 203 void __iomem *mapbase = sachip->base + SA1111_INTC; 204 205 stat0 = sa1111_readl(mapbase + SA1111_INTSTATCLR0); 206 stat1 = sa1111_readl(mapbase + SA1111_INTSTATCLR1); 207 208 sa1111_writel(stat0, mapbase + SA1111_INTSTATCLR0); 209 210 desc->irq_data.chip->irq_ack(&desc->irq_data); 211 212 sa1111_writel(stat1, mapbase + SA1111_INTSTATCLR1); 213 214 if (stat0 == 0 && stat1 == 0) { 215 do_bad_IRQ(desc); 216 return; 217 } 218 219 for (i = 0; stat0; i++, stat0 >>= 1) 220 if (stat0 & 1) 221 generic_handle_irq(i + sachip->irq_base); 222 223 for (i = 32; stat1; i++, stat1 >>= 1) 224 if (stat1 & 1) 225 generic_handle_irq(i + sachip->irq_base); 226 227 /* For level-based interrupts */ 228 desc->irq_data.chip->irq_unmask(&desc->irq_data); 229 } 230 231 #define SA1111_IRQMASK_LO(x) (1 << (x - sachip->irq_base)) 232 #define SA1111_IRQMASK_HI(x) (1 << (x - sachip->irq_base - 32)) 233 234 static void sa1111_ack_irq(struct irq_data *d) 235 { 236 } 237 238 static void sa1111_mask_lowirq(struct irq_data *d) 239 { 240 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 241 void __iomem *mapbase = sachip->base + SA1111_INTC; 242 unsigned long ie0; 243 244 ie0 = sa1111_readl(mapbase + SA1111_INTEN0); 245 ie0 &= ~SA1111_IRQMASK_LO(d->irq); 246 writel(ie0, mapbase + SA1111_INTEN0); 247 } 248 249 static void sa1111_unmask_lowirq(struct irq_data *d) 250 { 251 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 252 void __iomem *mapbase = sachip->base + SA1111_INTC; 253 unsigned long ie0; 254 255 ie0 = sa1111_readl(mapbase + SA1111_INTEN0); 256 ie0 |= SA1111_IRQMASK_LO(d->irq); 257 sa1111_writel(ie0, mapbase + SA1111_INTEN0); 258 } 259 260 /* 261 * Attempt to re-trigger the interrupt. The SA1111 contains a register 262 * (INTSET) which claims to do this. However, in practice no amount of 263 * manipulation of INTEN and INTSET guarantees that the interrupt will 264 * be triggered. In fact, its very difficult, if not impossible to get 265 * INTSET to re-trigger the interrupt. 266 */ 267 static int sa1111_retrigger_lowirq(struct irq_data *d) 268 { 269 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 270 void __iomem *mapbase = sachip->base + SA1111_INTC; 271 unsigned int mask = SA1111_IRQMASK_LO(d->irq); 272 unsigned long ip0; 273 int i; 274 275 ip0 = sa1111_readl(mapbase + SA1111_INTPOL0); 276 for (i = 0; i < 8; i++) { 277 sa1111_writel(ip0 ^ mask, mapbase + SA1111_INTPOL0); 278 sa1111_writel(ip0, mapbase + SA1111_INTPOL0); 279 if (sa1111_readl(mapbase + SA1111_INTSTATCLR0) & mask) 280 break; 281 } 282 283 if (i == 8) 284 pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n", 285 d->irq); 286 return i == 8 ? -1 : 0; 287 } 288 289 static int sa1111_type_lowirq(struct irq_data *d, unsigned int flags) 290 { 291 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 292 void __iomem *mapbase = sachip->base + SA1111_INTC; 293 unsigned int mask = SA1111_IRQMASK_LO(d->irq); 294 unsigned long ip0; 295 296 if (flags == IRQ_TYPE_PROBE) 297 return 0; 298 299 if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0) 300 return -EINVAL; 301 302 ip0 = sa1111_readl(mapbase + SA1111_INTPOL0); 303 if (flags & IRQ_TYPE_EDGE_RISING) 304 ip0 &= ~mask; 305 else 306 ip0 |= mask; 307 sa1111_writel(ip0, mapbase + SA1111_INTPOL0); 308 sa1111_writel(ip0, mapbase + SA1111_WAKEPOL0); 309 310 return 0; 311 } 312 313 static int sa1111_wake_lowirq(struct irq_data *d, unsigned int on) 314 { 315 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 316 void __iomem *mapbase = sachip->base + SA1111_INTC; 317 unsigned int mask = SA1111_IRQMASK_LO(d->irq); 318 unsigned long we0; 319 320 we0 = sa1111_readl(mapbase + SA1111_WAKEEN0); 321 if (on) 322 we0 |= mask; 323 else 324 we0 &= ~mask; 325 sa1111_writel(we0, mapbase + SA1111_WAKEEN0); 326 327 return 0; 328 } 329 330 static struct irq_chip sa1111_low_chip = { 331 .name = "SA1111-l", 332 .irq_ack = sa1111_ack_irq, 333 .irq_mask = sa1111_mask_lowirq, 334 .irq_unmask = sa1111_unmask_lowirq, 335 .irq_retrigger = sa1111_retrigger_lowirq, 336 .irq_set_type = sa1111_type_lowirq, 337 .irq_set_wake = sa1111_wake_lowirq, 338 }; 339 340 static void sa1111_mask_highirq(struct irq_data *d) 341 { 342 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 343 void __iomem *mapbase = sachip->base + SA1111_INTC; 344 unsigned long ie1; 345 346 ie1 = sa1111_readl(mapbase + SA1111_INTEN1); 347 ie1 &= ~SA1111_IRQMASK_HI(d->irq); 348 sa1111_writel(ie1, mapbase + SA1111_INTEN1); 349 } 350 351 static void sa1111_unmask_highirq(struct irq_data *d) 352 { 353 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 354 void __iomem *mapbase = sachip->base + SA1111_INTC; 355 unsigned long ie1; 356 357 ie1 = sa1111_readl(mapbase + SA1111_INTEN1); 358 ie1 |= SA1111_IRQMASK_HI(d->irq); 359 sa1111_writel(ie1, mapbase + SA1111_INTEN1); 360 } 361 362 /* 363 * Attempt to re-trigger the interrupt. The SA1111 contains a register 364 * (INTSET) which claims to do this. However, in practice no amount of 365 * manipulation of INTEN and INTSET guarantees that the interrupt will 366 * be triggered. In fact, its very difficult, if not impossible to get 367 * INTSET to re-trigger the interrupt. 368 */ 369 static int sa1111_retrigger_highirq(struct irq_data *d) 370 { 371 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 372 void __iomem *mapbase = sachip->base + SA1111_INTC; 373 unsigned int mask = SA1111_IRQMASK_HI(d->irq); 374 unsigned long ip1; 375 int i; 376 377 ip1 = sa1111_readl(mapbase + SA1111_INTPOL1); 378 for (i = 0; i < 8; i++) { 379 sa1111_writel(ip1 ^ mask, mapbase + SA1111_INTPOL1); 380 sa1111_writel(ip1, mapbase + SA1111_INTPOL1); 381 if (sa1111_readl(mapbase + SA1111_INTSTATCLR1) & mask) 382 break; 383 } 384 385 if (i == 8) 386 pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n", 387 d->irq); 388 return i == 8 ? -1 : 0; 389 } 390 391 static int sa1111_type_highirq(struct irq_data *d, unsigned int flags) 392 { 393 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 394 void __iomem *mapbase = sachip->base + SA1111_INTC; 395 unsigned int mask = SA1111_IRQMASK_HI(d->irq); 396 unsigned long ip1; 397 398 if (flags == IRQ_TYPE_PROBE) 399 return 0; 400 401 if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0) 402 return -EINVAL; 403 404 ip1 = sa1111_readl(mapbase + SA1111_INTPOL1); 405 if (flags & IRQ_TYPE_EDGE_RISING) 406 ip1 &= ~mask; 407 else 408 ip1 |= mask; 409 sa1111_writel(ip1, mapbase + SA1111_INTPOL1); 410 sa1111_writel(ip1, mapbase + SA1111_WAKEPOL1); 411 412 return 0; 413 } 414 415 static int sa1111_wake_highirq(struct irq_data *d, unsigned int on) 416 { 417 struct sa1111 *sachip = irq_data_get_irq_chip_data(d); 418 void __iomem *mapbase = sachip->base + SA1111_INTC; 419 unsigned int mask = SA1111_IRQMASK_HI(d->irq); 420 unsigned long we1; 421 422 we1 = sa1111_readl(mapbase + SA1111_WAKEEN1); 423 if (on) 424 we1 |= mask; 425 else 426 we1 &= ~mask; 427 sa1111_writel(we1, mapbase + SA1111_WAKEEN1); 428 429 return 0; 430 } 431 432 static struct irq_chip sa1111_high_chip = { 433 .name = "SA1111-h", 434 .irq_ack = sa1111_ack_irq, 435 .irq_mask = sa1111_mask_highirq, 436 .irq_unmask = sa1111_unmask_highirq, 437 .irq_retrigger = sa1111_retrigger_highirq, 438 .irq_set_type = sa1111_type_highirq, 439 .irq_set_wake = sa1111_wake_highirq, 440 }; 441 442 static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base) 443 { 444 void __iomem *irqbase = sachip->base + SA1111_INTC; 445 unsigned i, irq; 446 int ret; 447 448 /* 449 * We're guaranteed that this region hasn't been taken. 450 */ 451 request_mem_region(sachip->phys + SA1111_INTC, 512, "irq"); 452 453 ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1); 454 if (ret <= 0) { 455 dev_err(sachip->dev, "unable to allocate %u irqs: %d\n", 456 SA1111_IRQ_NR, ret); 457 if (ret == 0) 458 ret = -EINVAL; 459 return ret; 460 } 461 462 sachip->irq_base = ret; 463 464 /* disable all IRQs */ 465 sa1111_writel(0, irqbase + SA1111_INTEN0); 466 sa1111_writel(0, irqbase + SA1111_INTEN1); 467 sa1111_writel(0, irqbase + SA1111_WAKEEN0); 468 sa1111_writel(0, irqbase + SA1111_WAKEEN1); 469 470 /* 471 * detect on rising edge. Note: Feb 2001 Errata for SA1111 472 * specifies that S0ReadyInt and S1ReadyInt should be '1'. 473 */ 474 sa1111_writel(0, irqbase + SA1111_INTPOL0); 475 sa1111_writel(SA1111_IRQMASK_HI(IRQ_S0_READY_NINT) | 476 SA1111_IRQMASK_HI(IRQ_S1_READY_NINT), 477 irqbase + SA1111_INTPOL1); 478 479 /* clear all IRQs */ 480 sa1111_writel(~0, irqbase + SA1111_INTSTATCLR0); 481 sa1111_writel(~0, irqbase + SA1111_INTSTATCLR1); 482 483 for (i = IRQ_GPAIN0; i <= SSPROR; i++) { 484 irq = sachip->irq_base + i; 485 irq_set_chip_and_handler(irq, &sa1111_low_chip, 486 handle_edge_irq); 487 irq_set_chip_data(irq, sachip); 488 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); 489 } 490 491 for (i = AUDXMTDMADONEA; i <= IRQ_S1_BVD1_STSCHG; i++) { 492 irq = sachip->irq_base + i; 493 irq_set_chip_and_handler(irq, &sa1111_high_chip, 494 handle_edge_irq); 495 irq_set_chip_data(irq, sachip); 496 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); 497 } 498 499 /* 500 * Register SA1111 interrupt 501 */ 502 irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING); 503 irq_set_chained_handler_and_data(sachip->irq, sa1111_irq_handler, 504 sachip); 505 506 dev_info(sachip->dev, "Providing IRQ%u-%u\n", 507 sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1); 508 509 return 0; 510 } 511 512 /* 513 * Bring the SA1111 out of reset. This requires a set procedure: 514 * 1. nRESET asserted (by hardware) 515 * 2. CLK turned on from SA1110 516 * 3. nRESET deasserted 517 * 4. VCO turned on, PLL_BYPASS turned off 518 * 5. Wait lock time, then assert RCLKEn 519 * 7. PCR set to allow clocking of individual functions 520 * 521 * Until we've done this, the only registers we can access are: 522 * SBI_SKCR 523 * SBI_SMCR 524 * SBI_SKID 525 */ 526 static void sa1111_wake(struct sa1111 *sachip) 527 { 528 unsigned long flags, r; 529 530 spin_lock_irqsave(&sachip->lock, flags); 531 532 clk_enable(sachip->clk); 533 534 /* 535 * Turn VCO on, and disable PLL Bypass. 536 */ 537 r = sa1111_readl(sachip->base + SA1111_SKCR); 538 r &= ~SKCR_VCO_OFF; 539 sa1111_writel(r, sachip->base + SA1111_SKCR); 540 r |= SKCR_PLL_BYPASS | SKCR_OE_EN; 541 sa1111_writel(r, sachip->base + SA1111_SKCR); 542 543 /* 544 * Wait lock time. SA1111 manual _doesn't_ 545 * specify a figure for this! We choose 100us. 546 */ 547 udelay(100); 548 549 /* 550 * Enable RCLK. We also ensure that RDYEN is set. 551 */ 552 r |= SKCR_RCLKEN | SKCR_RDYEN; 553 sa1111_writel(r, sachip->base + SA1111_SKCR); 554 555 /* 556 * Wait 14 RCLK cycles for the chip to finish coming out 557 * of reset. (RCLK=24MHz). This is 590ns. 558 */ 559 udelay(1); 560 561 /* 562 * Ensure all clocks are initially off. 563 */ 564 sa1111_writel(0, sachip->base + SA1111_SKPCR); 565 566 spin_unlock_irqrestore(&sachip->lock, flags); 567 } 568 569 #ifdef CONFIG_ARCH_SA1100 570 571 static u32 sa1111_dma_mask[] = { 572 ~0, 573 ~(1 << 20), 574 ~(1 << 23), 575 ~(1 << 24), 576 ~(1 << 25), 577 ~(1 << 20), 578 ~(1 << 20), 579 0, 580 }; 581 582 /* 583 * Configure the SA1111 shared memory controller. 584 */ 585 void 586 sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac, 587 unsigned int cas_latency) 588 { 589 unsigned int smcr = SMCR_DTIM | SMCR_MBGE | FInsrt(drac, SMCR_DRAC); 590 591 if (cas_latency == 3) 592 smcr |= SMCR_CLAT; 593 594 sa1111_writel(smcr, sachip->base + SA1111_SMCR); 595 596 /* 597 * Now clear the bits in the DMA mask to work around the SA1111 598 * DMA erratum (Intel StrongARM SA-1111 Microprocessor Companion 599 * Chip Specification Update, June 2000, Erratum #7). 600 */ 601 if (sachip->dev->dma_mask) 602 *sachip->dev->dma_mask &= sa1111_dma_mask[drac >> 2]; 603 604 sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2]; 605 } 606 #endif 607 608 static void sa1111_dev_release(struct device *_dev) 609 { 610 struct sa1111_dev *dev = SA1111_DEV(_dev); 611 612 kfree(dev); 613 } 614 615 static int 616 sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent, 617 struct sa1111_dev_info *info) 618 { 619 struct sa1111_dev *dev; 620 unsigned i; 621 int ret; 622 623 dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL); 624 if (!dev) { 625 ret = -ENOMEM; 626 goto err_alloc; 627 } 628 629 device_initialize(&dev->dev); 630 dev_set_name(&dev->dev, "%4.4lx", info->offset); 631 dev->devid = info->devid; 632 dev->dev.parent = sachip->dev; 633 dev->dev.bus = &sa1111_bus_type; 634 dev->dev.release = sa1111_dev_release; 635 dev->res.start = sachip->phys + info->offset; 636 dev->res.end = dev->res.start + 511; 637 dev->res.name = dev_name(&dev->dev); 638 dev->res.flags = IORESOURCE_MEM; 639 dev->mapbase = sachip->base + info->offset; 640 dev->skpcr_mask = info->skpcr_mask; 641 642 for (i = 0; i < ARRAY_SIZE(info->irq); i++) 643 dev->irq[i] = sachip->irq_base + info->irq[i]; 644 645 /* 646 * If the parent device has a DMA mask associated with it, and 647 * this child supports DMA, propagate it down to the children. 648 */ 649 if (info->dma && sachip->dev->dma_mask) { 650 dev->dma_mask = *sachip->dev->dma_mask; 651 dev->dev.dma_mask = &dev->dma_mask; 652 dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask; 653 } 654 655 ret = request_resource(parent, &dev->res); 656 if (ret) { 657 dev_err(sachip->dev, "failed to allocate resource for %s\n", 658 dev->res.name); 659 goto err_resource; 660 } 661 662 ret = device_add(&dev->dev); 663 if (ret) 664 goto err_add; 665 return 0; 666 667 err_add: 668 release_resource(&dev->res); 669 err_resource: 670 put_device(&dev->dev); 671 err_alloc: 672 return ret; 673 } 674 675 /** 676 * sa1111_probe - probe for a single SA1111 chip. 677 * @phys_addr: physical address of device. 678 * 679 * Probe for a SA1111 chip. This must be called 680 * before any other SA1111-specific code. 681 * 682 * Returns: 683 * %-ENODEV device not found. 684 * %-EBUSY physical address already marked in-use. 685 * %-EINVAL no platform data passed 686 * %0 successful. 687 */ 688 static int __sa1111_probe(struct device *me, struct resource *mem, int irq) 689 { 690 struct sa1111_platform_data *pd = me->platform_data; 691 struct sa1111 *sachip; 692 unsigned long id; 693 unsigned int has_devs; 694 int i, ret = -ENODEV; 695 696 if (!pd) 697 return -EINVAL; 698 699 sachip = kzalloc(sizeof(struct sa1111), GFP_KERNEL); 700 if (!sachip) 701 return -ENOMEM; 702 703 sachip->clk = clk_get(me, "SA1111_CLK"); 704 if (IS_ERR(sachip->clk)) { 705 ret = PTR_ERR(sachip->clk); 706 goto err_free; 707 } 708 709 ret = clk_prepare(sachip->clk); 710 if (ret) 711 goto err_clkput; 712 713 spin_lock_init(&sachip->lock); 714 715 sachip->dev = me; 716 dev_set_drvdata(sachip->dev, sachip); 717 718 sachip->pdata = pd; 719 sachip->phys = mem->start; 720 sachip->irq = irq; 721 722 /* 723 * Map the whole region. This also maps the 724 * registers for our children. 725 */ 726 sachip->base = ioremap(mem->start, PAGE_SIZE * 2); 727 if (!sachip->base) { 728 ret = -ENOMEM; 729 goto err_clk_unprep; 730 } 731 732 /* 733 * Probe for the chip. Only touch the SBI registers. 734 */ 735 id = sa1111_readl(sachip->base + SA1111_SKID); 736 if ((id & SKID_ID_MASK) != SKID_SA1111_ID) { 737 printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id); 738 ret = -ENODEV; 739 goto err_unmap; 740 } 741 742 pr_info("SA1111 Microprocessor Companion Chip: silicon revision %lx, metal revision %lx\n", 743 (id & SKID_SIREV_MASK) >> 4, id & SKID_MTREV_MASK); 744 745 /* 746 * We found it. Wake the chip up, and initialise. 747 */ 748 sa1111_wake(sachip); 749 750 /* 751 * The interrupt controller must be initialised before any 752 * other device to ensure that the interrupts are available. 753 */ 754 if (sachip->irq != NO_IRQ) { 755 ret = sa1111_setup_irq(sachip, pd->irq_base); 756 if (ret) 757 goto err_unmap; 758 } 759 760 #ifdef CONFIG_ARCH_SA1100 761 { 762 unsigned int val; 763 764 /* 765 * The SDRAM configuration of the SA1110 and the SA1111 must 766 * match. This is very important to ensure that SA1111 accesses 767 * don't corrupt the SDRAM. Note that this ungates the SA1111's 768 * MBGNT signal, so we must have called sa1110_mb_disable() 769 * beforehand. 770 */ 771 sa1111_configure_smc(sachip, 1, 772 FExtr(MDCNFG, MDCNFG_SA1110_DRAC0), 773 FExtr(MDCNFG, MDCNFG_SA1110_TDL0)); 774 775 /* 776 * We only need to turn on DCLK whenever we want to use the 777 * DMA. It can otherwise be held firmly in the off position. 778 * (currently, we always enable it.) 779 */ 780 val = sa1111_readl(sachip->base + SA1111_SKPCR); 781 sa1111_writel(val | SKPCR_DCLKEN, sachip->base + SA1111_SKPCR); 782 783 /* 784 * Enable the SA1110 memory bus request and grant signals. 785 */ 786 sa1110_mb_enable(); 787 } 788 #endif 789 790 g_sa1111 = sachip; 791 792 has_devs = ~0; 793 if (pd) 794 has_devs &= ~pd->disable_devs; 795 796 for (i = 0; i < ARRAY_SIZE(sa1111_devices); i++) 797 if (sa1111_devices[i].devid & has_devs) 798 sa1111_init_one_child(sachip, mem, &sa1111_devices[i]); 799 800 return 0; 801 802 err_unmap: 803 iounmap(sachip->base); 804 err_clk_unprep: 805 clk_unprepare(sachip->clk); 806 err_clkput: 807 clk_put(sachip->clk); 808 err_free: 809 kfree(sachip); 810 return ret; 811 } 812 813 static int sa1111_remove_one(struct device *dev, void *data) 814 { 815 struct sa1111_dev *sadev = SA1111_DEV(dev); 816 device_del(&sadev->dev); 817 release_resource(&sadev->res); 818 put_device(&sadev->dev); 819 return 0; 820 } 821 822 static void __sa1111_remove(struct sa1111 *sachip) 823 { 824 void __iomem *irqbase = sachip->base + SA1111_INTC; 825 826 device_for_each_child(sachip->dev, NULL, sa1111_remove_one); 827 828 /* disable all IRQs */ 829 sa1111_writel(0, irqbase + SA1111_INTEN0); 830 sa1111_writel(0, irqbase + SA1111_INTEN1); 831 sa1111_writel(0, irqbase + SA1111_WAKEEN0); 832 sa1111_writel(0, irqbase + SA1111_WAKEEN1); 833 834 clk_disable(sachip->clk); 835 clk_unprepare(sachip->clk); 836 837 if (sachip->irq != NO_IRQ) { 838 irq_set_chained_handler_and_data(sachip->irq, NULL, NULL); 839 irq_free_descs(sachip->irq_base, SA1111_IRQ_NR); 840 841 release_mem_region(sachip->phys + SA1111_INTC, 512); 842 } 843 844 iounmap(sachip->base); 845 clk_put(sachip->clk); 846 kfree(sachip); 847 } 848 849 struct sa1111_save_data { 850 unsigned int skcr; 851 unsigned int skpcr; 852 unsigned int skcdr; 853 unsigned char skaud; 854 unsigned char skpwm0; 855 unsigned char skpwm1; 856 857 /* 858 * Interrupt controller 859 */ 860 unsigned int intpol0; 861 unsigned int intpol1; 862 unsigned int inten0; 863 unsigned int inten1; 864 unsigned int wakepol0; 865 unsigned int wakepol1; 866 unsigned int wakeen0; 867 unsigned int wakeen1; 868 }; 869 870 #ifdef CONFIG_PM 871 872 static int sa1111_suspend(struct platform_device *dev, pm_message_t state) 873 { 874 struct sa1111 *sachip = platform_get_drvdata(dev); 875 struct sa1111_save_data *save; 876 unsigned long flags; 877 unsigned int val; 878 void __iomem *base; 879 880 save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL); 881 if (!save) 882 return -ENOMEM; 883 sachip->saved_state = save; 884 885 spin_lock_irqsave(&sachip->lock, flags); 886 887 /* 888 * Save state. 889 */ 890 base = sachip->base; 891 save->skcr = sa1111_readl(base + SA1111_SKCR); 892 save->skpcr = sa1111_readl(base + SA1111_SKPCR); 893 save->skcdr = sa1111_readl(base + SA1111_SKCDR); 894 save->skaud = sa1111_readl(base + SA1111_SKAUD); 895 save->skpwm0 = sa1111_readl(base + SA1111_SKPWM0); 896 save->skpwm1 = sa1111_readl(base + SA1111_SKPWM1); 897 898 sa1111_writel(0, sachip->base + SA1111_SKPWM0); 899 sa1111_writel(0, sachip->base + SA1111_SKPWM1); 900 901 base = sachip->base + SA1111_INTC; 902 save->intpol0 = sa1111_readl(base + SA1111_INTPOL0); 903 save->intpol1 = sa1111_readl(base + SA1111_INTPOL1); 904 save->inten0 = sa1111_readl(base + SA1111_INTEN0); 905 save->inten1 = sa1111_readl(base + SA1111_INTEN1); 906 save->wakepol0 = sa1111_readl(base + SA1111_WAKEPOL0); 907 save->wakepol1 = sa1111_readl(base + SA1111_WAKEPOL1); 908 save->wakeen0 = sa1111_readl(base + SA1111_WAKEEN0); 909 save->wakeen1 = sa1111_readl(base + SA1111_WAKEEN1); 910 911 /* 912 * Disable. 913 */ 914 val = sa1111_readl(sachip->base + SA1111_SKCR); 915 sa1111_writel(val | SKCR_SLEEP, sachip->base + SA1111_SKCR); 916 917 clk_disable(sachip->clk); 918 919 spin_unlock_irqrestore(&sachip->lock, flags); 920 921 #ifdef CONFIG_ARCH_SA1100 922 sa1110_mb_disable(); 923 #endif 924 925 return 0; 926 } 927 928 /* 929 * sa1111_resume - Restore the SA1111 device state. 930 * @dev: device to restore 931 * 932 * Restore the general state of the SA1111; clock control and 933 * interrupt controller. Other parts of the SA1111 must be 934 * restored by their respective drivers, and must be called 935 * via LDM after this function. 936 */ 937 static int sa1111_resume(struct platform_device *dev) 938 { 939 struct sa1111 *sachip = platform_get_drvdata(dev); 940 struct sa1111_save_data *save; 941 unsigned long flags, id; 942 void __iomem *base; 943 944 save = sachip->saved_state; 945 if (!save) 946 return 0; 947 948 /* 949 * Ensure that the SA1111 is still here. 950 * FIXME: shouldn't do this here. 951 */ 952 id = sa1111_readl(sachip->base + SA1111_SKID); 953 if ((id & SKID_ID_MASK) != SKID_SA1111_ID) { 954 __sa1111_remove(sachip); 955 platform_set_drvdata(dev, NULL); 956 kfree(save); 957 return 0; 958 } 959 960 /* 961 * First of all, wake up the chip. 962 */ 963 sa1111_wake(sachip); 964 965 #ifdef CONFIG_ARCH_SA1100 966 /* Enable the memory bus request/grant signals */ 967 sa1110_mb_enable(); 968 #endif 969 970 /* 971 * Only lock for write ops. Also, sa1111_wake must be called with 972 * released spinlock! 973 */ 974 spin_lock_irqsave(&sachip->lock, flags); 975 976 sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN0); 977 sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN1); 978 979 base = sachip->base; 980 sa1111_writel(save->skcr, base + SA1111_SKCR); 981 sa1111_writel(save->skpcr, base + SA1111_SKPCR); 982 sa1111_writel(save->skcdr, base + SA1111_SKCDR); 983 sa1111_writel(save->skaud, base + SA1111_SKAUD); 984 sa1111_writel(save->skpwm0, base + SA1111_SKPWM0); 985 sa1111_writel(save->skpwm1, base + SA1111_SKPWM1); 986 987 base = sachip->base + SA1111_INTC; 988 sa1111_writel(save->intpol0, base + SA1111_INTPOL0); 989 sa1111_writel(save->intpol1, base + SA1111_INTPOL1); 990 sa1111_writel(save->inten0, base + SA1111_INTEN0); 991 sa1111_writel(save->inten1, base + SA1111_INTEN1); 992 sa1111_writel(save->wakepol0, base + SA1111_WAKEPOL0); 993 sa1111_writel(save->wakepol1, base + SA1111_WAKEPOL1); 994 sa1111_writel(save->wakeen0, base + SA1111_WAKEEN0); 995 sa1111_writel(save->wakeen1, base + SA1111_WAKEEN1); 996 997 spin_unlock_irqrestore(&sachip->lock, flags); 998 999 sachip->saved_state = NULL; 1000 kfree(save); 1001 1002 return 0; 1003 } 1004 1005 #else 1006 #define sa1111_suspend NULL 1007 #define sa1111_resume NULL 1008 #endif 1009 1010 static int sa1111_probe(struct platform_device *pdev) 1011 { 1012 struct resource *mem; 1013 int irq; 1014 1015 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1016 if (!mem) 1017 return -EINVAL; 1018 irq = platform_get_irq(pdev, 0); 1019 if (irq < 0) 1020 return -ENXIO; 1021 1022 return __sa1111_probe(&pdev->dev, mem, irq); 1023 } 1024 1025 static int sa1111_remove(struct platform_device *pdev) 1026 { 1027 struct sa1111 *sachip = platform_get_drvdata(pdev); 1028 1029 if (sachip) { 1030 #ifdef CONFIG_PM 1031 kfree(sachip->saved_state); 1032 sachip->saved_state = NULL; 1033 #endif 1034 __sa1111_remove(sachip); 1035 platform_set_drvdata(pdev, NULL); 1036 } 1037 1038 return 0; 1039 } 1040 1041 /* 1042 * Not sure if this should be on the system bus or not yet. 1043 * We really want some way to register a system device at 1044 * the per-machine level, and then have this driver pick 1045 * up the registered devices. 1046 * 1047 * We also need to handle the SDRAM configuration for 1048 * PXA250/SA1110 machine classes. 1049 */ 1050 static struct platform_driver sa1111_device_driver = { 1051 .probe = sa1111_probe, 1052 .remove = sa1111_remove, 1053 .suspend = sa1111_suspend, 1054 .resume = sa1111_resume, 1055 .driver = { 1056 .name = "sa1111", 1057 }, 1058 }; 1059 1060 /* 1061 * Get the parent device driver (us) structure 1062 * from a child function device 1063 */ 1064 static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev) 1065 { 1066 return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent); 1067 } 1068 1069 /* 1070 * The bits in the opdiv field are non-linear. 1071 */ 1072 static unsigned char opdiv_table[] = { 1, 4, 2, 8 }; 1073 1074 static unsigned int __sa1111_pll_clock(struct sa1111 *sachip) 1075 { 1076 unsigned int skcdr, fbdiv, ipdiv, opdiv; 1077 1078 skcdr = sa1111_readl(sachip->base + SA1111_SKCDR); 1079 1080 fbdiv = (skcdr & 0x007f) + 2; 1081 ipdiv = ((skcdr & 0x0f80) >> 7) + 2; 1082 opdiv = opdiv_table[(skcdr & 0x3000) >> 12]; 1083 1084 return 3686400 * fbdiv / (ipdiv * opdiv); 1085 } 1086 1087 /** 1088 * sa1111_pll_clock - return the current PLL clock frequency. 1089 * @sadev: SA1111 function block 1090 * 1091 * BUG: we should look at SKCR. We also blindly believe that 1092 * the chip is being fed with the 3.6864MHz clock. 1093 * 1094 * Returns the PLL clock in Hz. 1095 */ 1096 unsigned int sa1111_pll_clock(struct sa1111_dev *sadev) 1097 { 1098 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1099 1100 return __sa1111_pll_clock(sachip); 1101 } 1102 EXPORT_SYMBOL(sa1111_pll_clock); 1103 1104 /** 1105 * sa1111_select_audio_mode - select I2S or AC link mode 1106 * @sadev: SA1111 function block 1107 * @mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S 1108 * 1109 * Frob the SKCR to select AC Link mode or I2S mode for 1110 * the audio block. 1111 */ 1112 void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode) 1113 { 1114 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1115 unsigned long flags; 1116 unsigned int val; 1117 1118 spin_lock_irqsave(&sachip->lock, flags); 1119 1120 val = sa1111_readl(sachip->base + SA1111_SKCR); 1121 if (mode == SA1111_AUDIO_I2S) { 1122 val &= ~SKCR_SELAC; 1123 } else { 1124 val |= SKCR_SELAC; 1125 } 1126 sa1111_writel(val, sachip->base + SA1111_SKCR); 1127 1128 spin_unlock_irqrestore(&sachip->lock, flags); 1129 } 1130 EXPORT_SYMBOL(sa1111_select_audio_mode); 1131 1132 /** 1133 * sa1111_set_audio_rate - set the audio sample rate 1134 * @sadev: SA1111 SAC function block 1135 * @rate: sample rate to select 1136 */ 1137 int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate) 1138 { 1139 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1140 unsigned int div; 1141 1142 if (sadev->devid != SA1111_DEVID_SAC) 1143 return -EINVAL; 1144 1145 div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate; 1146 if (div == 0) 1147 div = 1; 1148 if (div > 128) 1149 div = 128; 1150 1151 sa1111_writel(div - 1, sachip->base + SA1111_SKAUD); 1152 1153 return 0; 1154 } 1155 EXPORT_SYMBOL(sa1111_set_audio_rate); 1156 1157 /** 1158 * sa1111_get_audio_rate - get the audio sample rate 1159 * @sadev: SA1111 SAC function block device 1160 */ 1161 int sa1111_get_audio_rate(struct sa1111_dev *sadev) 1162 { 1163 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1164 unsigned long div; 1165 1166 if (sadev->devid != SA1111_DEVID_SAC) 1167 return -EINVAL; 1168 1169 div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1; 1170 1171 return __sa1111_pll_clock(sachip) / (256 * div); 1172 } 1173 EXPORT_SYMBOL(sa1111_get_audio_rate); 1174 1175 void sa1111_set_io_dir(struct sa1111_dev *sadev, 1176 unsigned int bits, unsigned int dir, 1177 unsigned int sleep_dir) 1178 { 1179 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1180 unsigned long flags; 1181 unsigned int val; 1182 void __iomem *gpio = sachip->base + SA1111_GPIO; 1183 1184 #define MODIFY_BITS(port, mask, dir) \ 1185 if (mask) { \ 1186 val = sa1111_readl(port); \ 1187 val &= ~(mask); \ 1188 val |= (dir) & (mask); \ 1189 sa1111_writel(val, port); \ 1190 } 1191 1192 spin_lock_irqsave(&sachip->lock, flags); 1193 MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir); 1194 MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8); 1195 MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16); 1196 1197 MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir); 1198 MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8); 1199 MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16); 1200 spin_unlock_irqrestore(&sachip->lock, flags); 1201 } 1202 EXPORT_SYMBOL(sa1111_set_io_dir); 1203 1204 void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v) 1205 { 1206 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1207 unsigned long flags; 1208 unsigned int val; 1209 void __iomem *gpio = sachip->base + SA1111_GPIO; 1210 1211 spin_lock_irqsave(&sachip->lock, flags); 1212 MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v); 1213 MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8); 1214 MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16); 1215 spin_unlock_irqrestore(&sachip->lock, flags); 1216 } 1217 EXPORT_SYMBOL(sa1111_set_io); 1218 1219 void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v) 1220 { 1221 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1222 unsigned long flags; 1223 unsigned int val; 1224 void __iomem *gpio = sachip->base + SA1111_GPIO; 1225 1226 spin_lock_irqsave(&sachip->lock, flags); 1227 MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v); 1228 MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8); 1229 MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16); 1230 spin_unlock_irqrestore(&sachip->lock, flags); 1231 } 1232 EXPORT_SYMBOL(sa1111_set_sleep_io); 1233 1234 /* 1235 * Individual device operations. 1236 */ 1237 1238 /** 1239 * sa1111_enable_device - enable an on-chip SA1111 function block 1240 * @sadev: SA1111 function block device to enable 1241 */ 1242 int sa1111_enable_device(struct sa1111_dev *sadev) 1243 { 1244 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1245 unsigned long flags; 1246 unsigned int val; 1247 int ret = 0; 1248 1249 if (sachip->pdata && sachip->pdata->enable) 1250 ret = sachip->pdata->enable(sachip->pdata->data, sadev->devid); 1251 1252 if (ret == 0) { 1253 spin_lock_irqsave(&sachip->lock, flags); 1254 val = sa1111_readl(sachip->base + SA1111_SKPCR); 1255 sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR); 1256 spin_unlock_irqrestore(&sachip->lock, flags); 1257 } 1258 return ret; 1259 } 1260 EXPORT_SYMBOL(sa1111_enable_device); 1261 1262 /** 1263 * sa1111_disable_device - disable an on-chip SA1111 function block 1264 * @sadev: SA1111 function block device to disable 1265 */ 1266 void sa1111_disable_device(struct sa1111_dev *sadev) 1267 { 1268 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1269 unsigned long flags; 1270 unsigned int val; 1271 1272 spin_lock_irqsave(&sachip->lock, flags); 1273 val = sa1111_readl(sachip->base + SA1111_SKPCR); 1274 sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR); 1275 spin_unlock_irqrestore(&sachip->lock, flags); 1276 1277 if (sachip->pdata && sachip->pdata->disable) 1278 sachip->pdata->disable(sachip->pdata->data, sadev->devid); 1279 } 1280 EXPORT_SYMBOL(sa1111_disable_device); 1281 1282 /* 1283 * SA1111 "Register Access Bus." 1284 * 1285 * We model this as a regular bus type, and hang devices directly 1286 * off this. 1287 */ 1288 static int sa1111_match(struct device *_dev, struct device_driver *_drv) 1289 { 1290 struct sa1111_dev *dev = SA1111_DEV(_dev); 1291 struct sa1111_driver *drv = SA1111_DRV(_drv); 1292 1293 return !!(dev->devid & drv->devid); 1294 } 1295 1296 static int sa1111_bus_suspend(struct device *dev, pm_message_t state) 1297 { 1298 struct sa1111_dev *sadev = SA1111_DEV(dev); 1299 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1300 int ret = 0; 1301 1302 if (drv && drv->suspend) 1303 ret = drv->suspend(sadev, state); 1304 return ret; 1305 } 1306 1307 static int sa1111_bus_resume(struct device *dev) 1308 { 1309 struct sa1111_dev *sadev = SA1111_DEV(dev); 1310 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1311 int ret = 0; 1312 1313 if (drv && drv->resume) 1314 ret = drv->resume(sadev); 1315 return ret; 1316 } 1317 1318 static void sa1111_bus_shutdown(struct device *dev) 1319 { 1320 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1321 1322 if (drv && drv->shutdown) 1323 drv->shutdown(SA1111_DEV(dev)); 1324 } 1325 1326 static int sa1111_bus_probe(struct device *dev) 1327 { 1328 struct sa1111_dev *sadev = SA1111_DEV(dev); 1329 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1330 int ret = -ENODEV; 1331 1332 if (drv->probe) 1333 ret = drv->probe(sadev); 1334 return ret; 1335 } 1336 1337 static int sa1111_bus_remove(struct device *dev) 1338 { 1339 struct sa1111_dev *sadev = SA1111_DEV(dev); 1340 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1341 int ret = 0; 1342 1343 if (drv->remove) 1344 ret = drv->remove(sadev); 1345 return ret; 1346 } 1347 1348 struct bus_type sa1111_bus_type = { 1349 .name = "sa1111-rab", 1350 .match = sa1111_match, 1351 .probe = sa1111_bus_probe, 1352 .remove = sa1111_bus_remove, 1353 .suspend = sa1111_bus_suspend, 1354 .resume = sa1111_bus_resume, 1355 .shutdown = sa1111_bus_shutdown, 1356 }; 1357 EXPORT_SYMBOL(sa1111_bus_type); 1358 1359 int sa1111_driver_register(struct sa1111_driver *driver) 1360 { 1361 driver->drv.bus = &sa1111_bus_type; 1362 return driver_register(&driver->drv); 1363 } 1364 EXPORT_SYMBOL(sa1111_driver_register); 1365 1366 void sa1111_driver_unregister(struct sa1111_driver *driver) 1367 { 1368 driver_unregister(&driver->drv); 1369 } 1370 EXPORT_SYMBOL(sa1111_driver_unregister); 1371 1372 #ifdef CONFIG_DMABOUNCE 1373 /* 1374 * According to the "Intel StrongARM SA-1111 Microprocessor Companion 1375 * Chip Specification Update" (June 2000), erratum #7, there is a 1376 * significant bug in the SA1111 SDRAM shared memory controller. If 1377 * an access to a region of memory above 1MB relative to the bank base, 1378 * it is important that address bit 10 _NOT_ be asserted. Depending 1379 * on the configuration of the RAM, bit 10 may correspond to one 1380 * of several different (processor-relative) address bits. 1381 * 1382 * This routine only identifies whether or not a given DMA address 1383 * is susceptible to the bug. 1384 * 1385 * This should only get called for sa1111_device types due to the 1386 * way we configure our device dma_masks. 1387 */ 1388 static int sa1111_needs_bounce(struct device *dev, dma_addr_t addr, size_t size) 1389 { 1390 /* 1391 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module 1392 * User's Guide" mentions that jumpers R51 and R52 control the 1393 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or 1394 * SDRAM bank 1 on Neponset). The default configuration selects 1395 * Assabet, so any address in bank 1 is necessarily invalid. 1396 */ 1397 return (machine_is_assabet() || machine_is_pfs168()) && 1398 (addr >= 0xc8000000 || (addr + size) >= 0xc8000000); 1399 } 1400 1401 static int sa1111_notifier_call(struct notifier_block *n, unsigned long action, 1402 void *data) 1403 { 1404 struct sa1111_dev *dev = SA1111_DEV(data); 1405 1406 switch (action) { 1407 case BUS_NOTIFY_ADD_DEVICE: 1408 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL) { 1409 int ret = dmabounce_register_dev(&dev->dev, 1024, 4096, 1410 sa1111_needs_bounce); 1411 if (ret) 1412 dev_err(&dev->dev, "failed to register with dmabounce: %d\n", ret); 1413 } 1414 break; 1415 1416 case BUS_NOTIFY_DEL_DEVICE: 1417 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL) 1418 dmabounce_unregister_dev(&dev->dev); 1419 break; 1420 } 1421 return NOTIFY_OK; 1422 } 1423 1424 static struct notifier_block sa1111_bus_notifier = { 1425 .notifier_call = sa1111_notifier_call, 1426 }; 1427 #endif 1428 1429 static int __init sa1111_init(void) 1430 { 1431 int ret = bus_register(&sa1111_bus_type); 1432 #ifdef CONFIG_DMABOUNCE 1433 if (ret == 0) 1434 bus_register_notifier(&sa1111_bus_type, &sa1111_bus_notifier); 1435 #endif 1436 if (ret == 0) 1437 platform_driver_register(&sa1111_device_driver); 1438 return ret; 1439 } 1440 1441 static void __exit sa1111_exit(void) 1442 { 1443 platform_driver_unregister(&sa1111_device_driver); 1444 #ifdef CONFIG_DMABOUNCE 1445 bus_unregister_notifier(&sa1111_bus_type, &sa1111_bus_notifier); 1446 #endif 1447 bus_unregister(&sa1111_bus_type); 1448 } 1449 1450 subsys_initcall(sa1111_init); 1451 module_exit(sa1111_exit); 1452 1453 MODULE_DESCRIPTION("Intel Corporation SA1111 core driver"); 1454 MODULE_LICENSE("GPL"); 1455