pxamci.c 14.0 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364
/*
 *  linux/drivers/mmc/pxa.c - PXA MMCI driver
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This hardware is really sick:
 *   - No way to clear interrupts.
 *   - Have to turn off the clock whenever we touch the device.
 *   - Doesn't tell you how many data blocks were transferred.
 *  Yuck!
 *
 *	1 and 3 byte data transfers not supported
 *	max block length up to 1023
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>
#include <linux/mmc/protocol.h>

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/scatterlist.h>
#include <asm/sizes.h>

#include <asm/arch/pxa-regs.h>
#include <asm/arch/mmc.h>

#include "pxamci.h"

#ifdef CONFIG_MMC_DEBUG
#define DBG(x...)	printk(KERN_DEBUG x)
#else
#define DBG(x...)	do { } while (0)
#endif

#define DRIVER_NAME	"pxa2xx-mci"

#define NR_SG	1

struct pxamci_host {
	struct mmc_host		*mmc;
	spinlock_t		lock;
	struct resource		*res;
	void __iomem		*base;
	int			irq;
	int			dma;
	unsigned int		clkrt;
	unsigned int		cmdat;
	unsigned int		imask;
	unsigned int		power_mode;
	struct pxamci_platform_data *pdata;

	struct mmc_request	*mrq;
	struct mmc_command	*cmd;
	struct mmc_data		*data;

	dma_addr_t		sg_dma;
	struct pxa_dma_desc	*sg_cpu;
	unsigned int		dma_len;

	unsigned int		dma_dir;
};

static inline unsigned int ns_to_clocks(unsigned int ns)
{
	return (ns * (CLOCKRATE / 1000000) + 999) / 1000;
}

static void pxamci_stop_clock(struct pxamci_host *host)
{
	if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
		unsigned long timeout = 10000;
		unsigned int v;

		writel(STOP_CLOCK, host->base + MMC_STRPCL);

		do {
			v = readl(host->base + MMC_STAT);
			if (!(v & STAT_CLK_EN))
				break;
			udelay(1);
		} while (timeout--);

		if (v & STAT_CLK_EN)
			dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
	}
}

static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
{
	unsigned long flags;

	spin_lock_irqsave(&host->lock, flags);
	host->imask &= ~mask;
	writel(host->imask, host->base + MMC_I_MASK);
	spin_unlock_irqrestore(&host->lock, flags);
}

static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
{
	unsigned long flags;

	spin_lock_irqsave(&host->lock, flags);
	host->imask |= mask;
	writel(host->imask, host->base + MMC_I_MASK);
	spin_unlock_irqrestore(&host->lock, flags);
}

static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
{
	unsigned int nob = data->blocks;
	unsigned int timeout;
	u32 dcmd;
	int i;

	host->data = data;

	if (data->flags & MMC_DATA_STREAM)
		nob = 0xffff;

	writel(nob, host->base + MMC_NOB);
	writel(1 << data->blksz_bits, host->base + MMC_BLKLEN);

	timeout = ns_to_clocks(data->timeout_ns) + data->timeout_clks;
	writel((timeout + 255) / 256, host->base + MMC_RDTO);

	if (data->flags & MMC_DATA_READ) {
		host->dma_dir = DMA_FROM_DEVICE;
		dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
		DRCMRTXMMC = 0;
		DRCMRRXMMC = host->dma | DRCMR_MAPVLD;
	} else {
		host->dma_dir = DMA_TO_DEVICE;
		dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
		DRCMRRXMMC = 0;
		DRCMRTXMMC = host->dma | DRCMR_MAPVLD;
	}

	dcmd |= DCMD_BURST32 | DCMD_WIDTH1;

	host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
				   host->dma_dir);

	for (i = 0; i < host->dma_len; i++) {
		if (data->flags & MMC_DATA_READ) {
			host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
			host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
		} else {
			host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
			host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
		}
		host->sg_cpu[i].dcmd = dcmd | sg_dma_len(&data->sg[i]);
		host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
					sizeof(struct pxa_dma_desc);
	}
	host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
	wmb();

	DDADR(host->dma) = host->sg_dma;
	DCSR(host->dma) = DCSR_RUN;
}

static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
{
	WARN_ON(host->cmd != NULL);
	host->cmd = cmd;

	if (cmd->flags & MMC_RSP_BUSY)
		cmdat |= CMDAT_BUSY;

	switch (cmd->flags & (MMC_RSP_MASK | MMC_RSP_CRC)) {
	case MMC_RSP_SHORT | MMC_RSP_CRC:
		cmdat |= CMDAT_RESP_SHORT;
		break;
	case MMC_RSP_SHORT:
		cmdat |= CMDAT_RESP_R3;
		break;
	case MMC_RSP_LONG | MMC_RSP_CRC:
		cmdat |= CMDAT_RESP_R2;
		break;
	default:
		break;
	}

	writel(cmd->opcode, host->base + MMC_CMD);
	writel(cmd->arg >> 16, host->base + MMC_ARGH);
	writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
	writel(cmdat, host->base + MMC_CMDAT);
	writel(host->clkrt, host->base + MMC_CLKRT);

	writel(START_CLOCK, host->base + MMC_STRPCL);

	pxamci_enable_irq(host, END_CMD_RES);
}

static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
{
	DBG("PXAMCI: request done\n");
	host->mrq = NULL;
	host->cmd = NULL;
	host->data = NULL;
	mmc_request_done(host->mmc, mrq);
}

static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
{
	struct mmc_command *cmd = host->cmd;
	int i;
	u32 v;

	if (!cmd)
		return 0;

	host->cmd = NULL;

	/*
	 * Did I mention this is Sick.  We always need to
	 * discard the upper 8 bits of the first 16-bit word.
	 */
	v = readl(host->base + MMC_RES) & 0xffff;
	for (i = 0; i < 4; i++) {
		u32 w1 = readl(host->base + MMC_RES) & 0xffff;
		u32 w2 = readl(host->base + MMC_RES) & 0xffff;
		cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
		v = w2;
	}

	if (stat & STAT_TIME_OUT_RESPONSE) {
		cmd->error = MMC_ERR_TIMEOUT;
	} else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
#ifdef CONFIG_PXA27x
		/*
		 * workaround for erratum #42:
		 * Intel PXA27x Family Processor Specification Update Rev 001
		 */
		if (cmd->opcode == MMC_ALL_SEND_CID ||
		    cmd->opcode == MMC_SEND_CSD ||
		    cmd->opcode == MMC_SEND_CID) {
			/* a bogus CRC error can appear if the msb of
			   the 15 byte response is a one */
			if ((cmd->resp[0] & 0x80000000) == 0)
				cmd->error = MMC_ERR_BADCRC;
		} else {
			DBG("ignoring CRC from command %d - *risky*\n",cmd->opcode);
		}
#else
		cmd->error = MMC_ERR_BADCRC;
#endif
	}

	pxamci_disable_irq(host, END_CMD_RES);
	if (host->data && cmd->error == MMC_ERR_NONE) {
		pxamci_enable_irq(host, DATA_TRAN_DONE);
	} else {
		pxamci_finish_request(host, host->mrq);
	}

	return 1;
}

static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
{
	struct mmc_data *data = host->data;

	if (!data)
		return 0;

	DCSR(host->dma) = 0;
	dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
		     host->dma_dir);

	if (stat & STAT_READ_TIME_OUT)
		data->error = MMC_ERR_TIMEOUT;
	else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
		data->error = MMC_ERR_BADCRC;

	/*
	 * There appears to be a hardware design bug here.  There seems to
	 * be no way to find out how much data was transferred to the card.
	 * This means that if there was an error on any block, we mark all
	 * data blocks as being in error.
	 */
	if (data->error == MMC_ERR_NONE)
		data->bytes_xfered = data->blocks << data->blksz_bits;
	else
		data->bytes_xfered = 0;

	pxamci_disable_irq(host, DATA_TRAN_DONE);

	host->data = NULL;
	if (host->mrq->stop && data->error == MMC_ERR_NONE) {
		pxamci_stop_clock(host);
		pxamci_start_cmd(host, host->mrq->stop, 0);
	} else {
		pxamci_finish_request(host, host->mrq);
	}

	return 1;
}

static irqreturn_t pxamci_irq(int irq, void *devid, struct pt_regs *regs)
{
	struct pxamci_host *host = devid;
	unsigned int ireg;
	int handled = 0;

	ireg = readl(host->base + MMC_I_REG);

	DBG("PXAMCI: irq %08x\n", ireg);

	if (ireg) {
		unsigned stat = readl(host->base + MMC_STAT);

		DBG("PXAMCI: stat %08x\n", stat);

		if (ireg & END_CMD_RES)
			handled |= pxamci_cmd_done(host, stat);
		if (ireg & DATA_TRAN_DONE)
			handled |= pxamci_data_done(host, stat);
	}

	return IRQ_RETVAL(handled);
}

static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct pxamci_host *host = mmc_priv(mmc);
	unsigned int cmdat;

	WARN_ON(host->mrq != NULL);

	host->mrq = mrq;

	pxamci_stop_clock(host);

	cmdat = host->cmdat;
	host->cmdat &= ~CMDAT_INIT;

	if (mrq->data) {
		pxamci_setup_data(host, mrq->data);

		cmdat &= ~CMDAT_BUSY;
		cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
		if (mrq->data->flags & MMC_DATA_WRITE)
			cmdat |= CMDAT_WRITE;

		if (mrq->data->flags & MMC_DATA_STREAM)
			cmdat |= CMDAT_STREAM;
	}

	pxamci_start_cmd(host, mrq->cmd, cmdat);
}

365 366 367 368 369 370 371 372 373 374
static int pxamci_get_ro(struct mmc_host *mmc)
{
	struct pxamci_host *host = mmc_priv(mmc);

	if (host->pdata && host->pdata->get_ro)
		return host->pdata->get_ro(mmc->dev);
	/* Host doesn't support read only detection so assume writeable */
	return 0;
}

L
Linus Torvalds 已提交
375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct pxamci_host *host = mmc_priv(mmc);

	DBG("pxamci_set_ios: clock %u power %u vdd %u.%02u\n",
	    ios->clock, ios->power_mode, ios->vdd / 100,
	    ios->vdd % 100);

	if (ios->clock) {
		unsigned int clk = CLOCKRATE / ios->clock;
		if (CLOCKRATE / clk > ios->clock)
			clk <<= 1;
		host->clkrt = fls(clk) - 1;
		pxa_set_cken(CKEN12_MMC, 1);

		/*
		 * we write clkrt on the next command
		 */
	} else {
		pxamci_stop_clock(host);
		pxa_set_cken(CKEN12_MMC, 0);
	}

	if (host->power_mode != ios->power_mode) {
		host->power_mode = ios->power_mode;

		if (host->pdata && host->pdata->setpower)
			host->pdata->setpower(mmc->dev, ios->vdd);

		if (ios->power_mode == MMC_POWER_ON)
			host->cmdat |= CMDAT_INIT;
	}

	DBG("pxamci_set_ios: clkrt = %x cmdat = %x\n",
	    host->clkrt, host->cmdat);
}

static struct mmc_host_ops pxamci_ops = {
	.request	= pxamci_request,
414
	.get_ro		= pxamci_get_ro,
L
Linus Torvalds 已提交
415 416 417 418 419 420 421 422 423 424 425
	.set_ios	= pxamci_set_ios,
};

static void pxamci_dma_irq(int dma, void *devid, struct pt_regs *regs)
{
	printk(KERN_ERR "DMA%d: IRQ???\n", dma);
	DCSR(dma) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
}

static irqreturn_t pxamci_detect_irq(int irq, void *devid, struct pt_regs *regs)
{
426 427 428
	struct pxamci_host *host = mmc_priv(devid);

	mmc_detect_change(devid, host->pdata->detect_delay);
L
Linus Torvalds 已提交
429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
	return IRQ_HANDLED;
}

static int pxamci_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct mmc_host *mmc;
	struct pxamci_host *host = NULL;
	struct resource *r;
	int ret, irq;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);
	if (!r || irq == NO_IRQ)
		return -ENXIO;

	r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
	if (!r)
		return -EBUSY;

	mmc = mmc_alloc_host(sizeof(struct pxamci_host), dev);
	if (!mmc) {
		ret = -ENOMEM;
		goto out;
	}

	mmc->ops = &pxamci_ops;
	mmc->f_min = CLOCKRATE_MIN;
	mmc->f_max = CLOCKRATE_MAX;

	/*
	 * We can do SG-DMA, but we don't because we never know how much
	 * data we successfully wrote to the card.
	 */
	mmc->max_phys_segs = NR_SG;

	/*
	 * Our hardware DMA can handle a maximum of one page per SG entry.
	 */
	mmc->max_seg_size = PAGE_SIZE;

	host = mmc_priv(mmc);
	host->mmc = mmc;
	host->dma = -1;
	host->pdata = pdev->dev.platform_data;
	mmc->ocr_avail = host->pdata ?
			 host->pdata->ocr_mask :
			 MMC_VDD_32_33|MMC_VDD_33_34;

	host->sg_cpu = dma_alloc_coherent(dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
	if (!host->sg_cpu) {
		ret = -ENOMEM;
		goto out;
	}

	spin_lock_init(&host->lock);
	host->res = r;
	host->irq = irq;
	host->imask = MMC_I_MASK_ALL;

	host->base = ioremap(r->start, SZ_4K);
	if (!host->base) {
		ret = -ENOMEM;
		goto out;
	}

	/*
	 * Ensure that the host controller is shut down, and setup
	 * with our defaults.
	 */
	pxamci_stop_clock(host);
	writel(0, host->base + MMC_SPI);
	writel(64, host->base + MMC_RESTO);
	writel(host->imask, host->base + MMC_I_MASK);

	host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
				    pxamci_dma_irq, host);
	if (host->dma < 0) {
		ret = -EBUSY;
		goto out;
	}

	ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
	if (ret)
		goto out;

	dev_set_drvdata(dev, mmc);

	if (host->pdata && host->pdata->init)
		host->pdata->init(dev, pxamci_detect_irq, mmc);

	mmc_add_host(mmc);

	return 0;

 out:
	if (host) {
		if (host->dma >= 0)
			pxa_free_dma(host->dma);
		if (host->base)
			iounmap(host->base);
		if (host->sg_cpu)
			dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
	}
	if (mmc)
		mmc_free_host(mmc);
	release_resource(r);
	return ret;
}

static int pxamci_remove(struct device *dev)
{
	struct mmc_host *mmc = dev_get_drvdata(dev);

	dev_set_drvdata(dev, NULL);

	if (mmc) {
		struct pxamci_host *host = mmc_priv(mmc);

		if (host->pdata && host->pdata->exit)
			host->pdata->exit(dev, mmc);

		mmc_remove_host(mmc);

		pxamci_stop_clock(host);
		writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
		       END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
		       host->base + MMC_I_MASK);

		DRCMRRXMMC = 0;
		DRCMRTXMMC = 0;

		free_irq(host->irq, host);
		pxa_free_dma(host->dma);
		iounmap(host->base);
		dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);

		release_resource(host->res);

		mmc_free_host(mmc);
	}
	return 0;
}

#ifdef CONFIG_PM
574
static int pxamci_suspend(struct device *dev, pm_message_t state, u32 level)
L
Linus Torvalds 已提交
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623
{
	struct mmc_host *mmc = dev_get_drvdata(dev);
	int ret = 0;

	if (mmc && level == SUSPEND_DISABLE)
		ret = mmc_suspend_host(mmc, state);

	return ret;
}

static int pxamci_resume(struct device *dev, u32 level)
{
	struct mmc_host *mmc = dev_get_drvdata(dev);
	int ret = 0;

	if (mmc && level == RESUME_ENABLE)
		ret = mmc_resume_host(mmc);

	return ret;
}
#else
#define pxamci_suspend	NULL
#define pxamci_resume	NULL
#endif

static struct device_driver pxamci_driver = {
	.name		= DRIVER_NAME,
	.bus		= &platform_bus_type,
	.probe		= pxamci_probe,
	.remove		= pxamci_remove,
	.suspend	= pxamci_suspend,
	.resume		= pxamci_resume,
};

static int __init pxamci_init(void)
{
	return driver_register(&pxamci_driver);
}

static void __exit pxamci_exit(void)
{
	driver_unregister(&pxamci_driver);
}

module_init(pxamci_init);
module_exit(pxamci_exit);

MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
MODULE_LICENSE("GPL");