sa1111.c revision 6cab48602996cdbcb277375a8107d53e21e8c9b9
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/kernel.h> 20#include <linux/delay.h> 21#include <linux/errno.h> 22#include <linux/ioport.h> 23#include <linux/platform_device.h> 24#include <linux/slab.h> 25#include <linux/spinlock.h> 26#include <linux/dma-mapping.h> 27#include <linux/clk.h> 28 29#include <asm/hardware.h> 30#include <asm/mach-types.h> 31#include <asm/io.h> 32#include <asm/irq.h> 33#include <asm/mach/irq.h> 34#include <asm/sizes.h> 35 36#include <asm/hardware/sa1111.h> 37 38extern void __init sa1110_mb_enable(void); 39 40/* 41 * We keep the following data for the overall SA1111. Note that the 42 * struct device and struct resource are "fake"; they should be supplied 43 * by the bus above us. However, in the interests of getting all SA1111 44 * drivers converted over to the device model, we provide this as an 45 * anchor point for all the other drivers. 46 */ 47struct sa1111 { 48 struct device *dev; 49 struct clk *clk; 50 unsigned long phys; 51 int irq; 52 spinlock_t lock; 53 void __iomem *base; 54#ifdef CONFIG_PM 55 void *saved_state; 56#endif 57}; 58 59/* 60 * We _really_ need to eliminate this. Its only users 61 * are the PWM and DMA checking code. 62 */ 63static struct sa1111 *g_sa1111; 64 65struct sa1111_dev_info { 66 unsigned long offset; 67 unsigned long skpcr_mask; 68 unsigned int devid; 69 unsigned int irq[6]; 70}; 71 72static struct sa1111_dev_info sa1111_devices[] = { 73 { 74 .offset = SA1111_USB, 75 .skpcr_mask = SKPCR_UCLKEN, 76 .devid = SA1111_DEVID_USB, 77 .irq = { 78 IRQ_USBPWR, 79 IRQ_HCIM, 80 IRQ_HCIBUFFACC, 81 IRQ_HCIRMTWKP, 82 IRQ_NHCIMFCIR, 83 IRQ_USB_PORT_RESUME 84 }, 85 }, 86 { 87 .offset = 0x0600, 88 .skpcr_mask = SKPCR_I2SCLKEN | SKPCR_L3CLKEN, 89 .devid = SA1111_DEVID_SAC, 90 .irq = { 91 AUDXMTDMADONEA, 92 AUDXMTDMADONEB, 93 AUDRCVDMADONEA, 94 AUDRCVDMADONEB 95 }, 96 }, 97 { 98 .offset = 0x0800, 99 .skpcr_mask = SKPCR_SCLKEN, 100 .devid = SA1111_DEVID_SSP, 101 }, 102 { 103 .offset = SA1111_KBD, 104 .skpcr_mask = SKPCR_PTCLKEN, 105 .devid = SA1111_DEVID_PS2, 106 .irq = { 107 IRQ_TPRXINT, 108 IRQ_TPTXINT 109 }, 110 }, 111 { 112 .offset = SA1111_MSE, 113 .skpcr_mask = SKPCR_PMCLKEN, 114 .devid = SA1111_DEVID_PS2, 115 .irq = { 116 IRQ_MSRXINT, 117 IRQ_MSTXINT 118 }, 119 }, 120 { 121 .offset = 0x1800, 122 .skpcr_mask = 0, 123 .devid = SA1111_DEVID_PCMCIA, 124 .irq = { 125 IRQ_S0_READY_NINT, 126 IRQ_S0_CD_VALID, 127 IRQ_S0_BVD1_STSCHG, 128 IRQ_S1_READY_NINT, 129 IRQ_S1_CD_VALID, 130 IRQ_S1_BVD1_STSCHG, 131 }, 132 }, 133}; 134 135void __init sa1111_adjust_zones(int node, unsigned long *size, unsigned long *holes) 136{ 137 unsigned int sz = SZ_1M >> PAGE_SHIFT; 138 139 if (node != 0) 140 sz = 0; 141 142 size[1] = size[0] - sz; 143 size[0] = sz; 144} 145 146/* 147 * SA1111 interrupt support. Since clearing an IRQ while there are 148 * active IRQs causes the interrupt output to pulse, the upper levels 149 * will call us again if there are more interrupts to process. 150 */ 151static void 152sa1111_irq_handler(unsigned int irq, struct irq_desc *desc) 153{ 154 unsigned int stat0, stat1, i; 155 void __iomem *base = get_irq_data(irq); 156 157 stat0 = sa1111_readl(base + SA1111_INTSTATCLR0); 158 stat1 = sa1111_readl(base + SA1111_INTSTATCLR1); 159 160 sa1111_writel(stat0, base + SA1111_INTSTATCLR0); 161 162 desc->chip->ack(irq); 163 164 sa1111_writel(stat1, base + SA1111_INTSTATCLR1); 165 166 if (stat0 == 0 && stat1 == 0) { 167 do_bad_IRQ(irq, desc); 168 return; 169 } 170 171 for (i = IRQ_SA1111_START; stat0; i++, stat0 >>= 1) 172 if (stat0 & 1) 173 handle_edge_irq(i, irq_desc + i); 174 175 for (i = IRQ_SA1111_START + 32; stat1; i++, stat1 >>= 1) 176 if (stat1 & 1) 177 handle_edge_irq(i, irq_desc + i); 178 179 /* For level-based interrupts */ 180 desc->chip->unmask(irq); 181} 182 183#define SA1111_IRQMASK_LO(x) (1 << (x - IRQ_SA1111_START)) 184#define SA1111_IRQMASK_HI(x) (1 << (x - IRQ_SA1111_START - 32)) 185 186static void sa1111_ack_irq(unsigned int irq) 187{ 188} 189 190static void sa1111_mask_lowirq(unsigned int irq) 191{ 192 void __iomem *mapbase = get_irq_chip_data(irq); 193 unsigned long ie0; 194 195 ie0 = sa1111_readl(mapbase + SA1111_INTEN0); 196 ie0 &= ~SA1111_IRQMASK_LO(irq); 197 writel(ie0, mapbase + SA1111_INTEN0); 198} 199 200static void sa1111_unmask_lowirq(unsigned int irq) 201{ 202 void __iomem *mapbase = get_irq_chip_data(irq); 203 unsigned long ie0; 204 205 ie0 = sa1111_readl(mapbase + SA1111_INTEN0); 206 ie0 |= SA1111_IRQMASK_LO(irq); 207 sa1111_writel(ie0, mapbase + SA1111_INTEN0); 208} 209 210/* 211 * Attempt to re-trigger the interrupt. The SA1111 contains a register 212 * (INTSET) which claims to do this. However, in practice no amount of 213 * manipulation of INTEN and INTSET guarantees that the interrupt will 214 * be triggered. In fact, its very difficult, if not impossible to get 215 * INTSET to re-trigger the interrupt. 216 */ 217static int sa1111_retrigger_lowirq(unsigned int irq) 218{ 219 unsigned int mask = SA1111_IRQMASK_LO(irq); 220 void __iomem *mapbase = get_irq_chip_data(irq); 221 unsigned long ip0; 222 int i; 223 224 ip0 = sa1111_readl(mapbase + SA1111_INTPOL0); 225 for (i = 0; i < 8; i++) { 226 sa1111_writel(ip0 ^ mask, mapbase + SA1111_INTPOL0); 227 sa1111_writel(ip0, mapbase + SA1111_INTPOL0); 228 if (sa1111_readl(mapbase + SA1111_INTSTATCLR1) & mask) 229 break; 230 } 231 232 if (i == 8) 233 printk(KERN_ERR "Danger Will Robinson: failed to " 234 "re-trigger IRQ%d\n", irq); 235 return i == 8 ? -1 : 0; 236} 237 238static int sa1111_type_lowirq(unsigned int irq, unsigned int flags) 239{ 240 unsigned int mask = SA1111_IRQMASK_LO(irq); 241 void __iomem *mapbase = get_irq_chip_data(irq); 242 unsigned long ip0; 243 244 if (flags == IRQ_TYPE_PROBE) 245 return 0; 246 247 if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0) 248 return -EINVAL; 249 250 ip0 = sa1111_readl(mapbase + SA1111_INTPOL0); 251 if (flags & IRQ_TYPE_EDGE_RISING) 252 ip0 &= ~mask; 253 else 254 ip0 |= mask; 255 sa1111_writel(ip0, mapbase + SA1111_INTPOL0); 256 sa1111_writel(ip0, mapbase + SA1111_WAKEPOL0); 257 258 return 0; 259} 260 261static int sa1111_wake_lowirq(unsigned int irq, unsigned int on) 262{ 263 unsigned int mask = SA1111_IRQMASK_LO(irq); 264 void __iomem *mapbase = get_irq_chip_data(irq); 265 unsigned long we0; 266 267 we0 = sa1111_readl(mapbase + SA1111_WAKEEN0); 268 if (on) 269 we0 |= mask; 270 else 271 we0 &= ~mask; 272 sa1111_writel(we0, mapbase + SA1111_WAKEEN0); 273 274 return 0; 275} 276 277static struct irq_chip sa1111_low_chip = { 278 .name = "SA1111-l", 279 .ack = sa1111_ack_irq, 280 .mask = sa1111_mask_lowirq, 281 .unmask = sa1111_unmask_lowirq, 282 .retrigger = sa1111_retrigger_lowirq, 283 .set_type = sa1111_type_lowirq, 284 .set_wake = sa1111_wake_lowirq, 285}; 286 287static void sa1111_mask_highirq(unsigned int irq) 288{ 289 void __iomem *mapbase = get_irq_chip_data(irq); 290 unsigned long ie1; 291 292 ie1 = sa1111_readl(mapbase + SA1111_INTEN1); 293 ie1 &= ~SA1111_IRQMASK_HI(irq); 294 sa1111_writel(ie1, mapbase + SA1111_INTEN1); 295} 296 297static void sa1111_unmask_highirq(unsigned int irq) 298{ 299 void __iomem *mapbase = get_irq_chip_data(irq); 300 unsigned long ie1; 301 302 ie1 = sa1111_readl(mapbase + SA1111_INTEN1); 303 ie1 |= SA1111_IRQMASK_HI(irq); 304 sa1111_writel(ie1, mapbase + SA1111_INTEN1); 305} 306 307/* 308 * Attempt to re-trigger the interrupt. The SA1111 contains a register 309 * (INTSET) which claims to do this. However, in practice no amount of 310 * manipulation of INTEN and INTSET guarantees that the interrupt will 311 * be triggered. In fact, its very difficult, if not impossible to get 312 * INTSET to re-trigger the interrupt. 313 */ 314static int sa1111_retrigger_highirq(unsigned int irq) 315{ 316 unsigned int mask = SA1111_IRQMASK_HI(irq); 317 void __iomem *mapbase = get_irq_chip_data(irq); 318 unsigned long ip1; 319 int i; 320 321 ip1 = sa1111_readl(mapbase + SA1111_INTPOL1); 322 for (i = 0; i < 8; i++) { 323 sa1111_writel(ip1 ^ mask, mapbase + SA1111_INTPOL1); 324 sa1111_writel(ip1, mapbase + SA1111_INTPOL1); 325 if (sa1111_readl(mapbase + SA1111_INTSTATCLR1) & mask) 326 break; 327 } 328 329 if (i == 8) 330 printk(KERN_ERR "Danger Will Robinson: failed to " 331 "re-trigger IRQ%d\n", irq); 332 return i == 8 ? -1 : 0; 333} 334 335static int sa1111_type_highirq(unsigned int irq, unsigned int flags) 336{ 337 unsigned int mask = SA1111_IRQMASK_HI(irq); 338 void __iomem *mapbase = get_irq_chip_data(irq); 339 unsigned long ip1; 340 341 if (flags == IRQ_TYPE_PROBE) 342 return 0; 343 344 if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0) 345 return -EINVAL; 346 347 ip1 = sa1111_readl(mapbase + SA1111_INTPOL1); 348 if (flags & IRQ_TYPE_EDGE_RISING) 349 ip1 &= ~mask; 350 else 351 ip1 |= mask; 352 sa1111_writel(ip1, mapbase + SA1111_INTPOL1); 353 sa1111_writel(ip1, mapbase + SA1111_WAKEPOL1); 354 355 return 0; 356} 357 358static int sa1111_wake_highirq(unsigned int irq, unsigned int on) 359{ 360 unsigned int mask = SA1111_IRQMASK_HI(irq); 361 void __iomem *mapbase = get_irq_chip_data(irq); 362 unsigned long we1; 363 364 we1 = sa1111_readl(mapbase + SA1111_WAKEEN1); 365 if (on) 366 we1 |= mask; 367 else 368 we1 &= ~mask; 369 sa1111_writel(we1, mapbase + SA1111_WAKEEN1); 370 371 return 0; 372} 373 374static struct irq_chip sa1111_high_chip = { 375 .name = "SA1111-h", 376 .ack = sa1111_ack_irq, 377 .mask = sa1111_mask_highirq, 378 .unmask = sa1111_unmask_highirq, 379 .retrigger = sa1111_retrigger_highirq, 380 .set_type = sa1111_type_highirq, 381 .set_wake = sa1111_wake_highirq, 382}; 383 384static void sa1111_setup_irq(struct sa1111 *sachip) 385{ 386 void __iomem *irqbase = sachip->base + SA1111_INTC; 387 unsigned int irq; 388 389 /* 390 * We're guaranteed that this region hasn't been taken. 391 */ 392 request_mem_region(sachip->phys + SA1111_INTC, 512, "irq"); 393 394 /* disable all IRQs */ 395 sa1111_writel(0, irqbase + SA1111_INTEN0); 396 sa1111_writel(0, irqbase + SA1111_INTEN1); 397 sa1111_writel(0, irqbase + SA1111_WAKEEN0); 398 sa1111_writel(0, irqbase + SA1111_WAKEEN1); 399 400 /* 401 * detect on rising edge. Note: Feb 2001 Errata for SA1111 402 * specifies that S0ReadyInt and S1ReadyInt should be '1'. 403 */ 404 sa1111_writel(0, irqbase + SA1111_INTPOL0); 405 sa1111_writel(SA1111_IRQMASK_HI(IRQ_S0_READY_NINT) | 406 SA1111_IRQMASK_HI(IRQ_S1_READY_NINT), 407 irqbase + SA1111_INTPOL1); 408 409 /* clear all IRQs */ 410 sa1111_writel(~0, irqbase + SA1111_INTSTATCLR0); 411 sa1111_writel(~0, irqbase + SA1111_INTSTATCLR1); 412 413 for (irq = IRQ_GPAIN0; irq <= SSPROR; irq++) { 414 set_irq_chip(irq, &sa1111_low_chip); 415 set_irq_chip_data(irq, irqbase); 416 set_irq_handler(irq, handle_edge_irq); 417 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 418 } 419 420 for (irq = AUDXMTDMADONEA; irq <= IRQ_S1_BVD1_STSCHG; irq++) { 421 set_irq_chip(irq, &sa1111_high_chip); 422 set_irq_chip_data(irq, irqbase); 423 set_irq_handler(irq, handle_edge_irq); 424 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 425 } 426 427 /* 428 * Register SA1111 interrupt 429 */ 430 set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING); 431 set_irq_data(sachip->irq, irqbase); 432 set_irq_chained_handler(sachip->irq, sa1111_irq_handler); 433} 434 435/* 436 * Bring the SA1111 out of reset. This requires a set procedure: 437 * 1. nRESET asserted (by hardware) 438 * 2. CLK turned on from SA1110 439 * 3. nRESET deasserted 440 * 4. VCO turned on, PLL_BYPASS turned off 441 * 5. Wait lock time, then assert RCLKEn 442 * 7. PCR set to allow clocking of individual functions 443 * 444 * Until we've done this, the only registers we can access are: 445 * SBI_SKCR 446 * SBI_SMCR 447 * SBI_SKID 448 */ 449static void sa1111_wake(struct sa1111 *sachip) 450{ 451 unsigned long flags, r; 452 453 spin_lock_irqsave(&sachip->lock, flags); 454 455 clk_enable(sachip->clk); 456 457 /* 458 * Turn VCO on, and disable PLL Bypass. 459 */ 460 r = sa1111_readl(sachip->base + SA1111_SKCR); 461 r &= ~SKCR_VCO_OFF; 462 sa1111_writel(r, sachip->base + SA1111_SKCR); 463 r |= SKCR_PLL_BYPASS | SKCR_OE_EN; 464 sa1111_writel(r, sachip->base + SA1111_SKCR); 465 466 /* 467 * Wait lock time. SA1111 manual _doesn't_ 468 * specify a figure for this! We choose 100us. 469 */ 470 udelay(100); 471 472 /* 473 * Enable RCLK. We also ensure that RDYEN is set. 474 */ 475 r |= SKCR_RCLKEN | SKCR_RDYEN; 476 sa1111_writel(r, sachip->base + SA1111_SKCR); 477 478 /* 479 * Wait 14 RCLK cycles for the chip to finish coming out 480 * of reset. (RCLK=24MHz). This is 590ns. 481 */ 482 udelay(1); 483 484 /* 485 * Ensure all clocks are initially off. 486 */ 487 sa1111_writel(0, sachip->base + SA1111_SKPCR); 488 489 spin_unlock_irqrestore(&sachip->lock, flags); 490} 491 492#ifdef CONFIG_ARCH_SA1100 493 494static u32 sa1111_dma_mask[] = { 495 ~0, 496 ~(1 << 20), 497 ~(1 << 23), 498 ~(1 << 24), 499 ~(1 << 25), 500 ~(1 << 20), 501 ~(1 << 20), 502 0, 503}; 504 505/* 506 * Configure the SA1111 shared memory controller. 507 */ 508void 509sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac, 510 unsigned int cas_latency) 511{ 512 unsigned int smcr = SMCR_DTIM | SMCR_MBGE | FInsrt(drac, SMCR_DRAC); 513 514 if (cas_latency == 3) 515 smcr |= SMCR_CLAT; 516 517 sa1111_writel(smcr, sachip->base + SA1111_SMCR); 518 519 /* 520 * Now clear the bits in the DMA mask to work around the SA1111 521 * DMA erratum (Intel StrongARM SA-1111 Microprocessor Companion 522 * Chip Specification Update, June 2000, Erratum #7). 523 */ 524 if (sachip->dev->dma_mask) 525 *sachip->dev->dma_mask &= sa1111_dma_mask[drac >> 2]; 526 527 sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2]; 528} 529 530#endif 531 532static void sa1111_dev_release(struct device *_dev) 533{ 534 struct sa1111_dev *dev = SA1111_DEV(_dev); 535 536 release_resource(&dev->res); 537 kfree(dev); 538} 539 540static int 541sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent, 542 struct sa1111_dev_info *info) 543{ 544 struct sa1111_dev *dev; 545 int ret; 546 547 dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL); 548 if (!dev) { 549 ret = -ENOMEM; 550 goto out; 551 } 552 553 dev_set_name(&dev->dev, "%4.4lx", info->offset); 554 dev->devid = info->devid; 555 dev->dev.parent = sachip->dev; 556 dev->dev.bus = &sa1111_bus_type; 557 dev->dev.release = sa1111_dev_release; 558 dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask; 559 dev->res.start = sachip->phys + info->offset; 560 dev->res.end = dev->res.start + 511; 561 dev->res.name = dev_name(&dev->dev); 562 dev->res.flags = IORESOURCE_MEM; 563 dev->mapbase = sachip->base + info->offset; 564 dev->skpcr_mask = info->skpcr_mask; 565 memmove(dev->irq, info->irq, sizeof(dev->irq)); 566 567 ret = request_resource(parent, &dev->res); 568 if (ret) { 569 printk("SA1111: failed to allocate resource for %s\n", 570 dev->res.name); 571 dev_set_name(&dev->dev, NULL); 572 kfree(dev); 573 goto out; 574 } 575 576 577 ret = device_register(&dev->dev); 578 if (ret) { 579 release_resource(&dev->res); 580 kfree(dev); 581 goto out; 582 } 583 584 /* 585 * If the parent device has a DMA mask associated with it, 586 * propagate it down to the children. 587 */ 588 if (sachip->dev->dma_mask) { 589 dev->dma_mask = *sachip->dev->dma_mask; 590 dev->dev.dma_mask = &dev->dma_mask; 591 592 if (dev->dma_mask != 0xffffffffUL) { 593 ret = dmabounce_register_dev(&dev->dev, 1024, 4096); 594 if (ret) { 595 dev_err(&dev->dev, "SA1111: Failed to register" 596 " with dmabounce\n"); 597 device_unregister(&dev->dev); 598 } 599 } 600 } 601 602out: 603 return ret; 604} 605 606/** 607 * sa1111_probe - probe for a single SA1111 chip. 608 * @phys_addr: physical address of device. 609 * 610 * Probe for a SA1111 chip. This must be called 611 * before any other SA1111-specific code. 612 * 613 * Returns: 614 * %-ENODEV device not found. 615 * %-EBUSY physical address already marked in-use. 616 * %0 successful. 617 */ 618static int 619__sa1111_probe(struct device *me, struct resource *mem, int irq) 620{ 621 struct sa1111 *sachip; 622 unsigned long id; 623 unsigned int has_devs; 624 int i, ret = -ENODEV; 625 626 sachip = kzalloc(sizeof(struct sa1111), GFP_KERNEL); 627 if (!sachip) 628 return -ENOMEM; 629 630 sachip->clk = clk_get(me, "SA1111_CLK"); 631 if (!sachip->clk) { 632 ret = PTR_ERR(sachip->clk); 633 goto err_free; 634 } 635 636 spin_lock_init(&sachip->lock); 637 638 sachip->dev = me; 639 dev_set_drvdata(sachip->dev, sachip); 640 641 sachip->phys = mem->start; 642 sachip->irq = irq; 643 644 /* 645 * Map the whole region. This also maps the 646 * registers for our children. 647 */ 648 sachip->base = ioremap(mem->start, PAGE_SIZE * 2); 649 if (!sachip->base) { 650 ret = -ENOMEM; 651 goto err_clkput; 652 } 653 654 /* 655 * Probe for the chip. Only touch the SBI registers. 656 */ 657 id = sa1111_readl(sachip->base + SA1111_SKID); 658 if ((id & SKID_ID_MASK) != SKID_SA1111_ID) { 659 printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id); 660 ret = -ENODEV; 661 goto err_unmap; 662 } 663 664 printk(KERN_INFO "SA1111 Microprocessor Companion Chip: " 665 "silicon revision %lx, metal revision %lx\n", 666 (id & SKID_SIREV_MASK)>>4, (id & SKID_MTREV_MASK)); 667 668 /* 669 * We found it. Wake the chip up, and initialise. 670 */ 671 sa1111_wake(sachip); 672 673#ifdef CONFIG_ARCH_SA1100 674 { 675 unsigned int val; 676 677 /* 678 * The SDRAM configuration of the SA1110 and the SA1111 must 679 * match. This is very important to ensure that SA1111 accesses 680 * don't corrupt the SDRAM. Note that this ungates the SA1111's 681 * MBGNT signal, so we must have called sa1110_mb_disable() 682 * beforehand. 683 */ 684 sa1111_configure_smc(sachip, 1, 685 FExtr(MDCNFG, MDCNFG_SA1110_DRAC0), 686 FExtr(MDCNFG, MDCNFG_SA1110_TDL0)); 687 688 /* 689 * We only need to turn on DCLK whenever we want to use the 690 * DMA. It can otherwise be held firmly in the off position. 691 * (currently, we always enable it.) 692 */ 693 val = sa1111_readl(sachip->base + SA1111_SKPCR); 694 sa1111_writel(val | SKPCR_DCLKEN, sachip->base + SA1111_SKPCR); 695 696 /* 697 * Enable the SA1110 memory bus request and grant signals. 698 */ 699 sa1110_mb_enable(); 700 } 701#endif 702 703 /* 704 * The interrupt controller must be initialised before any 705 * other device to ensure that the interrupts are available. 706 */ 707 if (sachip->irq != NO_IRQ) 708 sa1111_setup_irq(sachip); 709 710 g_sa1111 = sachip; 711 712 has_devs = ~0; 713 if (machine_is_assabet() || machine_is_jornada720() || 714 machine_is_badge4()) 715 has_devs &= ~(1 << 4); 716 else 717 has_devs &= ~(1 << 1); 718 719 for (i = 0; i < ARRAY_SIZE(sa1111_devices); i++) 720 if (has_devs & (1 << i)) 721 sa1111_init_one_child(sachip, mem, &sa1111_devices[i]); 722 723 return 0; 724 725 err_unmap: 726 iounmap(sachip->base); 727 err_clkput: 728 clk_put(sachip->clk); 729 err_free: 730 kfree(sachip); 731 return ret; 732} 733 734static int sa1111_remove_one(struct device *dev, void *data) 735{ 736 device_unregister(dev); 737 return 0; 738} 739 740static void __sa1111_remove(struct sa1111 *sachip) 741{ 742 void __iomem *irqbase = sachip->base + SA1111_INTC; 743 744 device_for_each_child(sachip->dev, NULL, sa1111_remove_one); 745 746 /* disable all IRQs */ 747 sa1111_writel(0, irqbase + SA1111_INTEN0); 748 sa1111_writel(0, irqbase + SA1111_INTEN1); 749 sa1111_writel(0, irqbase + SA1111_WAKEEN0); 750 sa1111_writel(0, irqbase + SA1111_WAKEEN1); 751 752 clk_disable(sachip->clk); 753 754 if (sachip->irq != NO_IRQ) { 755 set_irq_chained_handler(sachip->irq, NULL); 756 set_irq_data(sachip->irq, NULL); 757 758 release_mem_region(sachip->phys + SA1111_INTC, 512); 759 } 760 761 iounmap(sachip->base); 762 clk_put(sachip->clk); 763 kfree(sachip); 764} 765 766/* 767 * According to the "Intel StrongARM SA-1111 Microprocessor Companion 768 * Chip Specification Update" (June 2000), erratum #7, there is a 769 * significant bug in the SA1111 SDRAM shared memory controller. If 770 * an access to a region of memory above 1MB relative to the bank base, 771 * it is important that address bit 10 _NOT_ be asserted. Depending 772 * on the configuration of the RAM, bit 10 may correspond to one 773 * of several different (processor-relative) address bits. 774 * 775 * This routine only identifies whether or not a given DMA address 776 * is susceptible to the bug. 777 * 778 * This should only get called for sa1111_device types due to the 779 * way we configure our device dma_masks. 780 */ 781int dma_needs_bounce(struct device *dev, dma_addr_t addr, size_t size) 782{ 783 /* 784 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module 785 * User's Guide" mentions that jumpers R51 and R52 control the 786 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or 787 * SDRAM bank 1 on Neponset). The default configuration selects 788 * Assabet, so any address in bank 1 is necessarily invalid. 789 */ 790 return ((machine_is_assabet() || machine_is_pfs168()) && 791 (addr >= 0xc8000000 || (addr + size) >= 0xc8000000)); 792} 793 794struct sa1111_save_data { 795 unsigned int skcr; 796 unsigned int skpcr; 797 unsigned int skcdr; 798 unsigned char skaud; 799 unsigned char skpwm0; 800 unsigned char skpwm1; 801 802 /* 803 * Interrupt controller 804 */ 805 unsigned int intpol0; 806 unsigned int intpol1; 807 unsigned int inten0; 808 unsigned int inten1; 809 unsigned int wakepol0; 810 unsigned int wakepol1; 811 unsigned int wakeen0; 812 unsigned int wakeen1; 813}; 814 815#ifdef CONFIG_PM 816 817static int sa1111_suspend(struct platform_device *dev, pm_message_t state) 818{ 819 struct sa1111 *sachip = platform_get_drvdata(dev); 820 struct sa1111_save_data *save; 821 unsigned long flags; 822 unsigned int val; 823 void __iomem *base; 824 825 save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL); 826 if (!save) 827 return -ENOMEM; 828 sachip->saved_state = save; 829 830 spin_lock_irqsave(&sachip->lock, flags); 831 832 /* 833 * Save state. 834 */ 835 base = sachip->base; 836 save->skcr = sa1111_readl(base + SA1111_SKCR); 837 save->skpcr = sa1111_readl(base + SA1111_SKPCR); 838 save->skcdr = sa1111_readl(base + SA1111_SKCDR); 839 save->skaud = sa1111_readl(base + SA1111_SKAUD); 840 save->skpwm0 = sa1111_readl(base + SA1111_SKPWM0); 841 save->skpwm1 = sa1111_readl(base + SA1111_SKPWM1); 842 843 base = sachip->base + SA1111_INTC; 844 save->intpol0 = sa1111_readl(base + SA1111_INTPOL0); 845 save->intpol1 = sa1111_readl(base + SA1111_INTPOL1); 846 save->inten0 = sa1111_readl(base + SA1111_INTEN0); 847 save->inten1 = sa1111_readl(base + SA1111_INTEN1); 848 save->wakepol0 = sa1111_readl(base + SA1111_WAKEPOL0); 849 save->wakepol1 = sa1111_readl(base + SA1111_WAKEPOL1); 850 save->wakeen0 = sa1111_readl(base + SA1111_WAKEEN0); 851 save->wakeen1 = sa1111_readl(base + SA1111_WAKEEN1); 852 853 /* 854 * Disable. 855 */ 856 val = sa1111_readl(sachip->base + SA1111_SKCR); 857 sa1111_writel(val | SKCR_SLEEP, sachip->base + SA1111_SKCR); 858 sa1111_writel(0, sachip->base + SA1111_SKPWM0); 859 sa1111_writel(0, sachip->base + SA1111_SKPWM1); 860 861 clk_disable(sachip->clk); 862 863 spin_unlock_irqrestore(&sachip->lock, flags); 864 865 return 0; 866} 867 868/* 869 * sa1111_resume - Restore the SA1111 device state. 870 * @dev: device to restore 871 * 872 * Restore the general state of the SA1111; clock control and 873 * interrupt controller. Other parts of the SA1111 must be 874 * restored by their respective drivers, and must be called 875 * via LDM after this function. 876 */ 877static int sa1111_resume(struct platform_device *dev) 878{ 879 struct sa1111 *sachip = platform_get_drvdata(dev); 880 struct sa1111_save_data *save; 881 unsigned long flags, id; 882 void __iomem *base; 883 884 save = sachip->saved_state; 885 if (!save) 886 return 0; 887 888 spin_lock_irqsave(&sachip->lock, flags); 889 890 /* 891 * Ensure that the SA1111 is still here. 892 * FIXME: shouldn't do this here. 893 */ 894 id = sa1111_readl(sachip->base + SA1111_SKID); 895 if ((id & SKID_ID_MASK) != SKID_SA1111_ID) { 896 __sa1111_remove(sachip); 897 platform_set_drvdata(dev, NULL); 898 kfree(save); 899 return 0; 900 } 901 902 /* 903 * First of all, wake up the chip. 904 */ 905 sa1111_wake(sachip); 906 sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN0); 907 sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN1); 908 909 base = sachip->base; 910 sa1111_writel(save->skcr, base + SA1111_SKCR); 911 sa1111_writel(save->skpcr, base + SA1111_SKPCR); 912 sa1111_writel(save->skcdr, base + SA1111_SKCDR); 913 sa1111_writel(save->skaud, base + SA1111_SKAUD); 914 sa1111_writel(save->skpwm0, base + SA1111_SKPWM0); 915 sa1111_writel(save->skpwm1, base + SA1111_SKPWM1); 916 917 base = sachip->base + SA1111_INTC; 918 sa1111_writel(save->intpol0, base + SA1111_INTPOL0); 919 sa1111_writel(save->intpol1, base + SA1111_INTPOL1); 920 sa1111_writel(save->inten0, base + SA1111_INTEN0); 921 sa1111_writel(save->inten1, base + SA1111_INTEN1); 922 sa1111_writel(save->wakepol0, base + SA1111_WAKEPOL0); 923 sa1111_writel(save->wakepol1, base + SA1111_WAKEPOL1); 924 sa1111_writel(save->wakeen0, base + SA1111_WAKEEN0); 925 sa1111_writel(save->wakeen1, base + SA1111_WAKEEN1); 926 927 spin_unlock_irqrestore(&sachip->lock, flags); 928 929 sachip->saved_state = NULL; 930 kfree(save); 931 932 return 0; 933} 934 935#else 936#define sa1111_suspend NULL 937#define sa1111_resume NULL 938#endif 939 940static int sa1111_probe(struct platform_device *pdev) 941{ 942 struct resource *mem; 943 int irq; 944 945 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 946 if (!mem) 947 return -EINVAL; 948 irq = platform_get_irq(pdev, 0); 949 if (irq < 0) 950 return -ENXIO; 951 952 return __sa1111_probe(&pdev->dev, mem, irq); 953} 954 955static int sa1111_remove(struct platform_device *pdev) 956{ 957 struct sa1111 *sachip = platform_get_drvdata(pdev); 958 959 if (sachip) { 960 __sa1111_remove(sachip); 961 platform_set_drvdata(pdev, NULL); 962 963#ifdef CONFIG_PM 964 kfree(sachip->saved_state); 965 sachip->saved_state = NULL; 966#endif 967 } 968 969 return 0; 970} 971 972/* 973 * Not sure if this should be on the system bus or not yet. 974 * We really want some way to register a system device at 975 * the per-machine level, and then have this driver pick 976 * up the registered devices. 977 * 978 * We also need to handle the SDRAM configuration for 979 * PXA250/SA1110 machine classes. 980 */ 981static struct platform_driver sa1111_device_driver = { 982 .probe = sa1111_probe, 983 .remove = sa1111_remove, 984 .suspend = sa1111_suspend, 985 .resume = sa1111_resume, 986 .driver = { 987 .name = "sa1111", 988 }, 989}; 990 991/* 992 * Get the parent device driver (us) structure 993 * from a child function device 994 */ 995static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev) 996{ 997 return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent); 998} 999 1000/* 1001 * The bits in the opdiv field are non-linear. 1002 */ 1003static unsigned char opdiv_table[] = { 1, 4, 2, 8 }; 1004 1005static unsigned int __sa1111_pll_clock(struct sa1111 *sachip) 1006{ 1007 unsigned int skcdr, fbdiv, ipdiv, opdiv; 1008 1009 skcdr = sa1111_readl(sachip->base + SA1111_SKCDR); 1010 1011 fbdiv = (skcdr & 0x007f) + 2; 1012 ipdiv = ((skcdr & 0x0f80) >> 7) + 2; 1013 opdiv = opdiv_table[(skcdr & 0x3000) >> 12]; 1014 1015 return 3686400 * fbdiv / (ipdiv * opdiv); 1016} 1017 1018/** 1019 * sa1111_pll_clock - return the current PLL clock frequency. 1020 * @sadev: SA1111 function block 1021 * 1022 * BUG: we should look at SKCR. We also blindly believe that 1023 * the chip is being fed with the 3.6864MHz clock. 1024 * 1025 * Returns the PLL clock in Hz. 1026 */ 1027unsigned int sa1111_pll_clock(struct sa1111_dev *sadev) 1028{ 1029 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1030 1031 return __sa1111_pll_clock(sachip); 1032} 1033 1034/** 1035 * sa1111_select_audio_mode - select I2S or AC link mode 1036 * @sadev: SA1111 function block 1037 * @mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S 1038 * 1039 * Frob the SKCR to select AC Link mode or I2S mode for 1040 * the audio block. 1041 */ 1042void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode) 1043{ 1044 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1045 unsigned long flags; 1046 unsigned int val; 1047 1048 spin_lock_irqsave(&sachip->lock, flags); 1049 1050 val = sa1111_readl(sachip->base + SA1111_SKCR); 1051 if (mode == SA1111_AUDIO_I2S) { 1052 val &= ~SKCR_SELAC; 1053 } else { 1054 val |= SKCR_SELAC; 1055 } 1056 sa1111_writel(val, sachip->base + SA1111_SKCR); 1057 1058 spin_unlock_irqrestore(&sachip->lock, flags); 1059} 1060 1061/** 1062 * sa1111_set_audio_rate - set the audio sample rate 1063 * @sadev: SA1111 SAC function block 1064 * @rate: sample rate to select 1065 */ 1066int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate) 1067{ 1068 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1069 unsigned int div; 1070 1071 if (sadev->devid != SA1111_DEVID_SAC) 1072 return -EINVAL; 1073 1074 div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate; 1075 if (div == 0) 1076 div = 1; 1077 if (div > 128) 1078 div = 128; 1079 1080 sa1111_writel(div - 1, sachip->base + SA1111_SKAUD); 1081 1082 return 0; 1083} 1084 1085/** 1086 * sa1111_get_audio_rate - get the audio sample rate 1087 * @sadev: SA1111 SAC function block device 1088 */ 1089int sa1111_get_audio_rate(struct sa1111_dev *sadev) 1090{ 1091 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1092 unsigned long div; 1093 1094 if (sadev->devid != SA1111_DEVID_SAC) 1095 return -EINVAL; 1096 1097 div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1; 1098 1099 return __sa1111_pll_clock(sachip) / (256 * div); 1100} 1101 1102void sa1111_set_io_dir(struct sa1111_dev *sadev, 1103 unsigned int bits, unsigned int dir, 1104 unsigned int sleep_dir) 1105{ 1106 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1107 unsigned long flags; 1108 unsigned int val; 1109 void __iomem *gpio = sachip->base + SA1111_GPIO; 1110 1111#define MODIFY_BITS(port, mask, dir) \ 1112 if (mask) { \ 1113 val = sa1111_readl(port); \ 1114 val &= ~(mask); \ 1115 val |= (dir) & (mask); \ 1116 sa1111_writel(val, port); \ 1117 } 1118 1119 spin_lock_irqsave(&sachip->lock, flags); 1120 MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir); 1121 MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8); 1122 MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16); 1123 1124 MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir); 1125 MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8); 1126 MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16); 1127 spin_unlock_irqrestore(&sachip->lock, flags); 1128} 1129 1130void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v) 1131{ 1132 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1133 unsigned long flags; 1134 unsigned int val; 1135 void __iomem *gpio = sachip->base + SA1111_GPIO; 1136 1137 spin_lock_irqsave(&sachip->lock, flags); 1138 MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v); 1139 MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8); 1140 MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16); 1141 spin_unlock_irqrestore(&sachip->lock, flags); 1142} 1143 1144void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v) 1145{ 1146 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1147 unsigned long flags; 1148 unsigned int val; 1149 void __iomem *gpio = sachip->base + SA1111_GPIO; 1150 1151 spin_lock_irqsave(&sachip->lock, flags); 1152 MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v); 1153 MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8); 1154 MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16); 1155 spin_unlock_irqrestore(&sachip->lock, flags); 1156} 1157 1158/* 1159 * Individual device operations. 1160 */ 1161 1162/** 1163 * sa1111_enable_device - enable an on-chip SA1111 function block 1164 * @sadev: SA1111 function block device to enable 1165 */ 1166void sa1111_enable_device(struct sa1111_dev *sadev) 1167{ 1168 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1169 unsigned long flags; 1170 unsigned int val; 1171 1172 spin_lock_irqsave(&sachip->lock, flags); 1173 val = sa1111_readl(sachip->base + SA1111_SKPCR); 1174 sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR); 1175 spin_unlock_irqrestore(&sachip->lock, flags); 1176} 1177 1178/** 1179 * sa1111_disable_device - disable an on-chip SA1111 function block 1180 * @sadev: SA1111 function block device to disable 1181 */ 1182void sa1111_disable_device(struct sa1111_dev *sadev) 1183{ 1184 struct sa1111 *sachip = sa1111_chip_driver(sadev); 1185 unsigned long flags; 1186 unsigned int val; 1187 1188 spin_lock_irqsave(&sachip->lock, flags); 1189 val = sa1111_readl(sachip->base + SA1111_SKPCR); 1190 sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR); 1191 spin_unlock_irqrestore(&sachip->lock, flags); 1192} 1193 1194/* 1195 * SA1111 "Register Access Bus." 1196 * 1197 * We model this as a regular bus type, and hang devices directly 1198 * off this. 1199 */ 1200static int sa1111_match(struct device *_dev, struct device_driver *_drv) 1201{ 1202 struct sa1111_dev *dev = SA1111_DEV(_dev); 1203 struct sa1111_driver *drv = SA1111_DRV(_drv); 1204 1205 return dev->devid == drv->devid; 1206} 1207 1208static int sa1111_bus_suspend(struct device *dev, pm_message_t state) 1209{ 1210 struct sa1111_dev *sadev = SA1111_DEV(dev); 1211 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1212 int ret = 0; 1213 1214 if (drv && drv->suspend) 1215 ret = drv->suspend(sadev, state); 1216 return ret; 1217} 1218 1219static int sa1111_bus_resume(struct device *dev) 1220{ 1221 struct sa1111_dev *sadev = SA1111_DEV(dev); 1222 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1223 int ret = 0; 1224 1225 if (drv && drv->resume) 1226 ret = drv->resume(sadev); 1227 return ret; 1228} 1229 1230static int sa1111_bus_probe(struct device *dev) 1231{ 1232 struct sa1111_dev *sadev = SA1111_DEV(dev); 1233 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1234 int ret = -ENODEV; 1235 1236 if (drv->probe) 1237 ret = drv->probe(sadev); 1238 return ret; 1239} 1240 1241static int sa1111_bus_remove(struct device *dev) 1242{ 1243 struct sa1111_dev *sadev = SA1111_DEV(dev); 1244 struct sa1111_driver *drv = SA1111_DRV(dev->driver); 1245 int ret = 0; 1246 1247 if (drv->remove) 1248 ret = drv->remove(sadev); 1249 return ret; 1250} 1251 1252struct bus_type sa1111_bus_type = { 1253 .name = "sa1111-rab", 1254 .match = sa1111_match, 1255 .probe = sa1111_bus_probe, 1256 .remove = sa1111_bus_remove, 1257 .suspend = sa1111_bus_suspend, 1258 .resume = sa1111_bus_resume, 1259}; 1260 1261int sa1111_driver_register(struct sa1111_driver *driver) 1262{ 1263 driver->drv.bus = &sa1111_bus_type; 1264 return driver_register(&driver->drv); 1265} 1266 1267void sa1111_driver_unregister(struct sa1111_driver *driver) 1268{ 1269 driver_unregister(&driver->drv); 1270} 1271 1272static int __init sa1111_init(void) 1273{ 1274 int ret = bus_register(&sa1111_bus_type); 1275 if (ret == 0) 1276 platform_driver_register(&sa1111_device_driver); 1277 return ret; 1278} 1279 1280static void __exit sa1111_exit(void) 1281{ 1282 platform_driver_unregister(&sa1111_device_driver); 1283 bus_unregister(&sa1111_bus_type); 1284} 1285 1286subsys_initcall(sa1111_init); 1287module_exit(sa1111_exit); 1288 1289MODULE_DESCRIPTION("Intel Corporation SA1111 core driver"); 1290MODULE_LICENSE("GPL"); 1291 1292EXPORT_SYMBOL(sa1111_select_audio_mode); 1293EXPORT_SYMBOL(sa1111_set_audio_rate); 1294EXPORT_SYMBOL(sa1111_get_audio_rate); 1295EXPORT_SYMBOL(sa1111_set_io_dir); 1296EXPORT_SYMBOL(sa1111_set_io); 1297EXPORT_SYMBOL(sa1111_set_sleep_io); 1298EXPORT_SYMBOL(sa1111_enable_device); 1299EXPORT_SYMBOL(sa1111_disable_device); 1300EXPORT_SYMBOL(sa1111_pll_clock); 1301EXPORT_SYMBOL(sa1111_bus_type); 1302EXPORT_SYMBOL(sa1111_driver_register); 1303EXPORT_SYMBOL(sa1111_driver_unregister); 1304