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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright © 2009 - Maxim Levitsky4 * driver for Ricoh xD readers5 */6 7#define DRV_NAME "r852"8#define pr_fmt(fmt)  DRV_NAME ": " fmt9 10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/jiffies.h>13#include <linux/workqueue.h>14#include <linux/interrupt.h>15#include <linux/pci.h>16#include <linux/pci_ids.h>17#include <linux/delay.h>18#include <linux/slab.h>19#include <asm/byteorder.h>20#include <linux/sched.h>21#include "sm_common.h"22#include "r852.h"23 24 25static bool r852_enable_dma = 1;26module_param(r852_enable_dma, bool, S_IRUGO);27MODULE_PARM_DESC(r852_enable_dma, "Enable usage of the DMA (default)");28 29static int debug;30module_param(debug, int, S_IRUGO | S_IWUSR);31MODULE_PARM_DESC(debug, "Debug level (0-2)");32 33/* read register */34static inline uint8_t r852_read_reg(struct r852_device *dev, int address)35{36	uint8_t reg = readb(dev->mmio + address);37	return reg;38}39 40/* write register */41static inline void r852_write_reg(struct r852_device *dev,42						int address, uint8_t value)43{44	writeb(value, dev->mmio + address);45}46 47 48/* read dword sized register */49static inline uint32_t r852_read_reg_dword(struct r852_device *dev, int address)50{51	uint32_t reg = le32_to_cpu(readl(dev->mmio + address));52	return reg;53}54 55/* write dword sized register */56static inline void r852_write_reg_dword(struct r852_device *dev,57							int address, uint32_t value)58{59	writel(cpu_to_le32(value), dev->mmio + address);60}61 62/* returns pointer to our private structure */63static inline struct r852_device *r852_get_dev(struct mtd_info *mtd)64{65	struct nand_chip *chip = mtd_to_nand(mtd);66	return nand_get_controller_data(chip);67}68 69 70/* check if controller supports dma */71static void r852_dma_test(struct r852_device *dev)72{73	dev->dma_usable = (r852_read_reg(dev, R852_DMA_CAP) &74		(R852_DMA1 | R852_DMA2)) == (R852_DMA1 | R852_DMA2);75 76	if (!dev->dma_usable)77		message("Non dma capable device detected, dma disabled");78 79	if (!r852_enable_dma) {80		message("disabling dma on user request");81		dev->dma_usable = 0;82	}83}84 85/*86 * Enable dma. Enables ether first or second stage of the DMA,87 * Expects dev->dma_dir and dev->dma_state be set88 */89static void r852_dma_enable(struct r852_device *dev)90{91	uint8_t dma_reg, dma_irq_reg;92 93	/* Set up dma settings */94	dma_reg = r852_read_reg_dword(dev, R852_DMA_SETTINGS);95	dma_reg &= ~(R852_DMA_READ | R852_DMA_INTERNAL | R852_DMA_MEMORY);96 97	if (dev->dma_dir)98		dma_reg |= R852_DMA_READ;99 100	if (dev->dma_state == DMA_INTERNAL) {101		dma_reg |= R852_DMA_INTERNAL;102		/* Precaution to make sure HW doesn't write */103			/* to random kernel memory */104		r852_write_reg_dword(dev, R852_DMA_ADDR,105			cpu_to_le32(dev->phys_bounce_buffer));106	} else {107		dma_reg |= R852_DMA_MEMORY;108		r852_write_reg_dword(dev, R852_DMA_ADDR,109			cpu_to_le32(dev->phys_dma_addr));110	}111 112	/* Precaution: make sure write reached the device */113	r852_read_reg_dword(dev, R852_DMA_ADDR);114 115	r852_write_reg_dword(dev, R852_DMA_SETTINGS, dma_reg);116 117	/* Set dma irq */118	dma_irq_reg = r852_read_reg_dword(dev, R852_DMA_IRQ_ENABLE);119	r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE,120		dma_irq_reg |121		R852_DMA_IRQ_INTERNAL |122		R852_DMA_IRQ_ERROR |123		R852_DMA_IRQ_MEMORY);124}125 126/*127 * Disable dma, called from the interrupt handler, which specifies128 * success of the operation via 'error' argument129 */130static void r852_dma_done(struct r852_device *dev, int error)131{132	WARN_ON(dev->dma_stage == 0);133 134	r852_write_reg_dword(dev, R852_DMA_IRQ_STA,135			r852_read_reg_dword(dev, R852_DMA_IRQ_STA));136 137	r852_write_reg_dword(dev, R852_DMA_SETTINGS, 0);138	r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE, 0);139 140	/* Precaution to make sure HW doesn't write to random kernel memory */141	r852_write_reg_dword(dev, R852_DMA_ADDR,142		cpu_to_le32(dev->phys_bounce_buffer));143	r852_read_reg_dword(dev, R852_DMA_ADDR);144 145	dev->dma_error = error;146	dev->dma_stage = 0;147 148	if (dev->phys_dma_addr && dev->phys_dma_addr != dev->phys_bounce_buffer)149		dma_unmap_single(&dev->pci_dev->dev, dev->phys_dma_addr,150			R852_DMA_LEN,151			dev->dma_dir ? DMA_FROM_DEVICE : DMA_TO_DEVICE);152}153 154/*155 * Wait, till dma is done, which includes both phases of it156 */157static int r852_dma_wait(struct r852_device *dev)158{159	long timeout = wait_for_completion_timeout(&dev->dma_done,160				msecs_to_jiffies(1000));161	if (!timeout) {162		dbg("timeout waiting for DMA interrupt");163		return -ETIMEDOUT;164	}165 166	return 0;167}168 169/*170 * Read/Write one page using dma. Only pages can be read (512 bytes)171*/172static void r852_do_dma(struct r852_device *dev, uint8_t *buf, int do_read)173{174	int bounce = 0;175	unsigned long flags;176	int error;177 178	dev->dma_error = 0;179 180	/* Set dma direction */181	dev->dma_dir = do_read;182	dev->dma_stage = 1;183	reinit_completion(&dev->dma_done);184 185	dbg_verbose("doing dma %s ", do_read ? "read" : "write");186 187	/* Set initial dma state: for reading first fill on board buffer,188	  from device, for writes first fill the buffer  from memory*/189	dev->dma_state = do_read ? DMA_INTERNAL : DMA_MEMORY;190 191	/* if incoming buffer is not page aligned, we should do bounce */192	if ((unsigned long)buf & (R852_DMA_LEN-1))193		bounce = 1;194 195	if (!bounce) {196		dev->phys_dma_addr = dma_map_single(&dev->pci_dev->dev, buf,197			R852_DMA_LEN,198			do_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);199		if (dma_mapping_error(&dev->pci_dev->dev, dev->phys_dma_addr))200			bounce = 1;201	}202 203	if (bounce) {204		dbg_verbose("dma: using bounce buffer");205		dev->phys_dma_addr = dev->phys_bounce_buffer;206		if (!do_read)207			memcpy(dev->bounce_buffer, buf, R852_DMA_LEN);208	}209 210	/* Enable DMA */211	spin_lock_irqsave(&dev->irqlock, flags);212	r852_dma_enable(dev);213	spin_unlock_irqrestore(&dev->irqlock, flags);214 215	/* Wait till complete */216	error = r852_dma_wait(dev);217 218	if (error) {219		r852_dma_done(dev, error);220		return;221	}222 223	if (do_read && bounce)224		memcpy((void *)buf, dev->bounce_buffer, R852_DMA_LEN);225}226 227/*228 * Program data lines of the nand chip to send data to it229 */230static void r852_write_buf(struct nand_chip *chip, const uint8_t *buf, int len)231{232	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));233	uint32_t reg;234 235	/* Don't allow any access to hardware if we suspect card removal */236	if (dev->card_unstable)237		return;238 239	/* Special case for whole sector read */240	if (len == R852_DMA_LEN && dev->dma_usable) {241		r852_do_dma(dev, (uint8_t *)buf, 0);242		return;243	}244 245	/* write DWORD chinks - faster */246	while (len >= 4) {247		reg = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;248		r852_write_reg_dword(dev, R852_DATALINE, reg);249		buf += 4;250		len -= 4;251 252	}253 254	/* write rest */255	while (len > 0) {256		r852_write_reg(dev, R852_DATALINE, *buf++);257		len--;258	}259}260 261/*262 * Read data lines of the nand chip to retrieve data263 */264static void r852_read_buf(struct nand_chip *chip, uint8_t *buf, int len)265{266	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));267	uint32_t reg;268 269	if (dev->card_unstable) {270		/* since we can't signal error here, at least, return271			predictable buffer */272		memset(buf, 0, len);273		return;274	}275 276	/* special case for whole sector read */277	if (len == R852_DMA_LEN && dev->dma_usable) {278		r852_do_dma(dev, buf, 1);279		return;280	}281 282	/* read in dword sized chunks */283	while (len >= 4) {284 285		reg = r852_read_reg_dword(dev, R852_DATALINE);286		*buf++ = reg & 0xFF;287		*buf++ = (reg >> 8) & 0xFF;288		*buf++ = (reg >> 16) & 0xFF;289		*buf++ = (reg >> 24) & 0xFF;290		len -= 4;291	}292 293	/* read the reset by bytes */294	while (len--)295		*buf++ = r852_read_reg(dev, R852_DATALINE);296}297 298/*299 * Read one byte from nand chip300 */301static uint8_t r852_read_byte(struct nand_chip *chip)302{303	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));304 305	/* Same problem as in r852_read_buf.... */306	if (dev->card_unstable)307		return 0;308 309	return r852_read_reg(dev, R852_DATALINE);310}311 312/*313 * Control several chip lines & send commands314 */315static void r852_cmdctl(struct nand_chip *chip, int dat, unsigned int ctrl)316{317	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));318 319	if (dev->card_unstable)320		return;321 322	if (ctrl & NAND_CTRL_CHANGE) {323 324		dev->ctlreg &= ~(R852_CTL_DATA | R852_CTL_COMMAND |325				 R852_CTL_ON | R852_CTL_CARDENABLE);326 327		if (ctrl & NAND_ALE)328			dev->ctlreg |= R852_CTL_DATA;329 330		if (ctrl & NAND_CLE)331			dev->ctlreg |= R852_CTL_COMMAND;332 333		if (ctrl & NAND_NCE)334			dev->ctlreg |= (R852_CTL_CARDENABLE | R852_CTL_ON);335		else336			dev->ctlreg &= ~R852_CTL_WRITE;337 338		/* when write is stareted, enable write access */339		if (dat == NAND_CMD_ERASE1)340			dev->ctlreg |= R852_CTL_WRITE;341 342		r852_write_reg(dev, R852_CTL, dev->ctlreg);343	}344 345	 /* HACK: NAND_CMD_SEQIN is called without NAND_CTRL_CHANGE, but we need346		to set write mode */347	if (dat == NAND_CMD_SEQIN && (dev->ctlreg & R852_CTL_COMMAND)) {348		dev->ctlreg |= R852_CTL_WRITE;349		r852_write_reg(dev, R852_CTL, dev->ctlreg);350	}351 352	if (dat != NAND_CMD_NONE)353		r852_write_reg(dev, R852_DATALINE, dat);354}355 356/*357 * Wait till card is ready.358 * based on nand_wait, but returns errors on DMA error359 */360static int r852_wait(struct nand_chip *chip)361{362	struct r852_device *dev = nand_get_controller_data(chip);363 364	unsigned long timeout;365	u8 status;366 367	timeout = jiffies + msecs_to_jiffies(400);368 369	while (time_before(jiffies, timeout))370		if (chip->legacy.dev_ready(chip))371			break;372 373	nand_status_op(chip, &status);374 375	/* Unfortunelly, no way to send detailed error status... */376	if (dev->dma_error) {377		status |= NAND_STATUS_FAIL;378		dev->dma_error = 0;379	}380	return status;381}382 383/*384 * Check if card is ready385 */386 387static int r852_ready(struct nand_chip *chip)388{389	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));390	return !(r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_BUSY);391}392 393 394/*395 * Set ECC engine mode396*/397 398static void r852_ecc_hwctl(struct nand_chip *chip, int mode)399{400	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));401 402	if (dev->card_unstable)403		return;404 405	switch (mode) {406	case NAND_ECC_READ:407	case NAND_ECC_WRITE:408		/* enable ecc generation/check*/409		dev->ctlreg |= R852_CTL_ECC_ENABLE;410 411		/* flush ecc buffer */412		r852_write_reg(dev, R852_CTL,413			dev->ctlreg | R852_CTL_ECC_ACCESS);414 415		r852_read_reg_dword(dev, R852_DATALINE);416		r852_write_reg(dev, R852_CTL, dev->ctlreg);417		return;418 419	case NAND_ECC_READSYN:420		/* disable ecc generation */421		dev->ctlreg &= ~R852_CTL_ECC_ENABLE;422		r852_write_reg(dev, R852_CTL, dev->ctlreg);423	}424}425 426/*427 * Calculate ECC, only used for writes428 */429 430static int r852_ecc_calculate(struct nand_chip *chip, const uint8_t *dat,431			      uint8_t *ecc_code)432{433	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));434	struct sm_oob *oob = (struct sm_oob *)ecc_code;435	uint32_t ecc1, ecc2;436 437	if (dev->card_unstable)438		return 0;439 440	dev->ctlreg &= ~R852_CTL_ECC_ENABLE;441	r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);442 443	ecc1 = r852_read_reg_dword(dev, R852_DATALINE);444	ecc2 = r852_read_reg_dword(dev, R852_DATALINE);445 446	oob->ecc1[0] = (ecc1) & 0xFF;447	oob->ecc1[1] = (ecc1 >> 8) & 0xFF;448	oob->ecc1[2] = (ecc1 >> 16) & 0xFF;449 450	oob->ecc2[0] = (ecc2) & 0xFF;451	oob->ecc2[1] = (ecc2 >> 8) & 0xFF;452	oob->ecc2[2] = (ecc2 >> 16) & 0xFF;453 454	r852_write_reg(dev, R852_CTL, dev->ctlreg);455	return 0;456}457 458/*459 * Correct the data using ECC, hw did almost everything for us460 */461 462static int r852_ecc_correct(struct nand_chip *chip, uint8_t *dat,463			    uint8_t *read_ecc, uint8_t *calc_ecc)464{465	uint32_t ecc_reg;466	uint8_t ecc_status, err_byte;467	int i, error = 0;468 469	struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));470 471	if (dev->card_unstable)472		return 0;473 474	if (dev->dma_error) {475		dev->dma_error = 0;476		return -EIO;477	}478 479	r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);480	ecc_reg = r852_read_reg_dword(dev, R852_DATALINE);481	r852_write_reg(dev, R852_CTL, dev->ctlreg);482 483	for (i = 0 ; i <= 1 ; i++) {484 485		ecc_status = (ecc_reg >> 8) & 0xFF;486 487		/* ecc uncorrectable error */488		if (ecc_status & R852_ECC_FAIL) {489			dbg("ecc: unrecoverable error, in half %d", i);490			error = -EBADMSG;491			goto exit;492		}493 494		/* correctable error */495		if (ecc_status & R852_ECC_CORRECTABLE) {496 497			err_byte = ecc_reg & 0xFF;498			dbg("ecc: recoverable error, "499				"in half %d, byte %d, bit %d", i,500				err_byte, ecc_status & R852_ECC_ERR_BIT_MSK);501 502			dat[err_byte] ^=503				1 << (ecc_status & R852_ECC_ERR_BIT_MSK);504			error++;505		}506 507		dat += 256;508		ecc_reg >>= 16;509	}510exit:511	return error;512}513 514/*515 * This is copy of nand_read_oob_std516 * nand_read_oob_syndrome assumes we can send column address - we can't517 */518static int r852_read_oob(struct nand_chip *chip, int page)519{520	struct mtd_info *mtd = nand_to_mtd(chip);521 522	return nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);523}524 525/*526 * Start the nand engine527 */528 529static void r852_engine_enable(struct r852_device *dev)530{531	if (r852_read_reg_dword(dev, R852_HW) & R852_HW_UNKNOWN) {532		r852_write_reg(dev, R852_CTL, R852_CTL_RESET | R852_CTL_ON);533		r852_write_reg_dword(dev, R852_HW, R852_HW_ENABLED);534	} else {535		r852_write_reg_dword(dev, R852_HW, R852_HW_ENABLED);536		r852_write_reg(dev, R852_CTL, R852_CTL_RESET | R852_CTL_ON);537	}538	msleep(300);539	r852_write_reg(dev, R852_CTL, 0);540}541 542 543/*544 * Stop the nand engine545 */546 547static void r852_engine_disable(struct r852_device *dev)548{549	r852_write_reg_dword(dev, R852_HW, 0);550	r852_write_reg(dev, R852_CTL, R852_CTL_RESET);551}552 553/*554 * Test if card is present555 */556 557static void r852_card_update_present(struct r852_device *dev)558{559	unsigned long flags;560	uint8_t reg;561 562	spin_lock_irqsave(&dev->irqlock, flags);563	reg = r852_read_reg(dev, R852_CARD_STA);564	dev->card_detected = !!(reg & R852_CARD_STA_PRESENT);565	spin_unlock_irqrestore(&dev->irqlock, flags);566}567 568/*569 * Update card detection IRQ state according to current card state570 * which is read in r852_card_update_present571 */572static void r852_update_card_detect(struct r852_device *dev)573{574	int card_detect_reg = r852_read_reg(dev, R852_CARD_IRQ_ENABLE);575	dev->card_unstable = 0;576 577	card_detect_reg &= ~(R852_CARD_IRQ_REMOVE | R852_CARD_IRQ_INSERT);578	card_detect_reg |= R852_CARD_IRQ_GENABLE;579 580	card_detect_reg |= dev->card_detected ?581		R852_CARD_IRQ_REMOVE : R852_CARD_IRQ_INSERT;582 583	r852_write_reg(dev, R852_CARD_IRQ_ENABLE, card_detect_reg);584}585 586static ssize_t media_type_show(struct device *sys_dev,587			       struct device_attribute *attr, char *buf)588{589	struct mtd_info *mtd = container_of(sys_dev, struct mtd_info, dev);590	struct r852_device *dev = r852_get_dev(mtd);591	char *data = dev->sm ? "smartmedia" : "xd";592 593	strcpy(buf, data);594	return strlen(data);595}596static DEVICE_ATTR_RO(media_type);597 598 599/* Detect properties of card in slot */600static void r852_update_media_status(struct r852_device *dev)601{602	uint8_t reg;603	unsigned long flags;604	int readonly;605 606	spin_lock_irqsave(&dev->irqlock, flags);607	if (!dev->card_detected) {608		message("card removed");609		spin_unlock_irqrestore(&dev->irqlock, flags);610		return ;611	}612 613	readonly  = r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_RO;614	reg = r852_read_reg(dev, R852_DMA_CAP);615	dev->sm = (reg & (R852_DMA1 | R852_DMA2)) && (reg & R852_SMBIT);616 617	message("detected %s %s card in slot",618		dev->sm ? "SmartMedia" : "xD",619		readonly ? "readonly" : "writeable");620 621	dev->readonly = readonly;622	spin_unlock_irqrestore(&dev->irqlock, flags);623}624 625/*626 * Register the nand device627 * Called when the card is detected628 */629static int r852_register_nand_device(struct r852_device *dev)630{631	struct mtd_info *mtd = nand_to_mtd(dev->chip);632 633	WARN_ON(dev->card_registered);634 635	mtd->dev.parent = &dev->pci_dev->dev;636 637	if (dev->readonly)638		dev->chip->options |= NAND_ROM;639 640	r852_engine_enable(dev);641 642	if (sm_register_device(mtd, dev->sm))643		goto error1;644 645	if (device_create_file(&mtd->dev, &dev_attr_media_type)) {646		message("can't create media type sysfs attribute");647		goto error3;648	}649 650	dev->card_registered = 1;651	return 0;652error3:653	WARN_ON(mtd_device_unregister(nand_to_mtd(dev->chip)));654	nand_cleanup(dev->chip);655error1:656	/* Force card redetect */657	dev->card_detected = 0;658	return -1;659}660 661/*662 * Unregister the card663 */664 665static void r852_unregister_nand_device(struct r852_device *dev)666{667	struct mtd_info *mtd = nand_to_mtd(dev->chip);668 669	if (!dev->card_registered)670		return;671 672	device_remove_file(&mtd->dev, &dev_attr_media_type);673	WARN_ON(mtd_device_unregister(mtd));674	nand_cleanup(dev->chip);675	r852_engine_disable(dev);676	dev->card_registered = 0;677}678 679/* Card state updater */680static void r852_card_detect_work(struct work_struct *work)681{682	struct r852_device *dev =683		container_of(work, struct r852_device, card_detect_work.work);684 685	r852_card_update_present(dev);686	r852_update_card_detect(dev);687	dev->card_unstable = 0;688 689	/* False alarm */690	if (dev->card_detected == dev->card_registered)691		goto exit;692 693	/* Read media properties */694	r852_update_media_status(dev);695 696	/* Register the card */697	if (dev->card_detected)698		r852_register_nand_device(dev);699	else700		r852_unregister_nand_device(dev);701exit:702	r852_update_card_detect(dev);703}704 705/* Ack + disable IRQ generation */706static void r852_disable_irqs(struct r852_device *dev)707{708	uint8_t reg;709	reg = r852_read_reg(dev, R852_CARD_IRQ_ENABLE);710	r852_write_reg(dev, R852_CARD_IRQ_ENABLE, reg & ~R852_CARD_IRQ_MASK);711 712	reg = r852_read_reg_dword(dev, R852_DMA_IRQ_ENABLE);713	r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE,714					reg & ~R852_DMA_IRQ_MASK);715 716	r852_write_reg(dev, R852_CARD_IRQ_STA, R852_CARD_IRQ_MASK);717	r852_write_reg_dword(dev, R852_DMA_IRQ_STA, R852_DMA_IRQ_MASK);718}719 720/* Interrupt handler */721static irqreturn_t r852_irq(int irq, void *data)722{723	struct r852_device *dev = (struct r852_device *)data;724 725	uint8_t card_status, dma_status;726	irqreturn_t ret = IRQ_NONE;727 728	spin_lock(&dev->irqlock);729 730	/* handle card detection interrupts first */731	card_status = r852_read_reg(dev, R852_CARD_IRQ_STA);732	r852_write_reg(dev, R852_CARD_IRQ_STA, card_status);733 734	if (card_status & (R852_CARD_IRQ_INSERT|R852_CARD_IRQ_REMOVE)) {735 736		ret = IRQ_HANDLED;737		dev->card_detected = !!(card_status & R852_CARD_IRQ_INSERT);738 739		/* we shouldn't receive any interrupts if we wait for card740			to settle */741		WARN_ON(dev->card_unstable);742 743		/* disable irqs while card is unstable */744		/* this will timeout DMA if active, but better that garbage */745		r852_disable_irqs(dev);746 747		if (dev->card_unstable)748			goto out;749 750		/* let, card state to settle a bit, and then do the work */751		dev->card_unstable = 1;752		queue_delayed_work(dev->card_workqueue,753			&dev->card_detect_work, msecs_to_jiffies(100));754		goto out;755	}756 757 758	/* Handle dma interrupts */759	dma_status = r852_read_reg_dword(dev, R852_DMA_IRQ_STA);760	r852_write_reg_dword(dev, R852_DMA_IRQ_STA, dma_status);761 762	if (dma_status & R852_DMA_IRQ_MASK) {763 764		ret = IRQ_HANDLED;765 766		if (dma_status & R852_DMA_IRQ_ERROR) {767			dbg("received dma error IRQ");768			r852_dma_done(dev, -EIO);769			complete(&dev->dma_done);770			goto out;771		}772 773		/* received DMA interrupt out of nowhere? */774		WARN_ON_ONCE(dev->dma_stage == 0);775 776		if (dev->dma_stage == 0)777			goto out;778 779		/* done device access */780		if (dev->dma_state == DMA_INTERNAL &&781				(dma_status & R852_DMA_IRQ_INTERNAL)) {782 783			dev->dma_state = DMA_MEMORY;784			dev->dma_stage++;785		}786 787		/* done memory DMA */788		if (dev->dma_state == DMA_MEMORY &&789				(dma_status & R852_DMA_IRQ_MEMORY)) {790			dev->dma_state = DMA_INTERNAL;791			dev->dma_stage++;792		}793 794		/* Enable 2nd half of dma dance */795		if (dev->dma_stage == 2)796			r852_dma_enable(dev);797 798		/* Operation done */799		if (dev->dma_stage == 3) {800			r852_dma_done(dev, 0);801			complete(&dev->dma_done);802		}803		goto out;804	}805 806	/* Handle unknown interrupts */807	if (dma_status)808		dbg("bad dma IRQ status = %x", dma_status);809 810	if (card_status & ~R852_CARD_STA_CD)811		dbg("strange card status = %x", card_status);812 813out:814	spin_unlock(&dev->irqlock);815	return ret;816}817 818static int r852_attach_chip(struct nand_chip *chip)819{820	if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST)821		return 0;822 823	chip->ecc.placement = NAND_ECC_PLACEMENT_INTERLEAVED;824	chip->ecc.size = R852_DMA_LEN;825	chip->ecc.bytes = SM_OOB_SIZE;826	chip->ecc.strength = 2;827	chip->ecc.hwctl = r852_ecc_hwctl;828	chip->ecc.calculate = r852_ecc_calculate;829	chip->ecc.correct = r852_ecc_correct;830 831	/* TODO: hack */832	chip->ecc.read_oob = r852_read_oob;833 834	return 0;835}836 837static const struct nand_controller_ops r852_ops = {838	.attach_chip = r852_attach_chip,839};840 841static int  r852_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)842{843	int error;844	struct nand_chip *chip;845	struct r852_device *dev;846 847	/* pci initialization */848	error = pci_enable_device(pci_dev);849 850	if (error)851		goto error1;852 853	pci_set_master(pci_dev);854 855	error = dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32));856	if (error)857		goto error2;858 859	error = pci_request_regions(pci_dev, DRV_NAME);860 861	if (error)862		goto error3;863 864	error = -ENOMEM;865 866	/* init nand chip, but register it only on card insert */867	chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);868 869	if (!chip)870		goto error4;871 872	/* commands */873	chip->legacy.cmd_ctrl = r852_cmdctl;874	chip->legacy.waitfunc = r852_wait;875	chip->legacy.dev_ready = r852_ready;876 877	/* I/O */878	chip->legacy.read_byte = r852_read_byte;879	chip->legacy.read_buf = r852_read_buf;880	chip->legacy.write_buf = r852_write_buf;881 882	/* init our device structure */883	dev = kzalloc(sizeof(struct r852_device), GFP_KERNEL);884 885	if (!dev)886		goto error5;887 888	nand_set_controller_data(chip, dev);889	dev->chip = chip;890	dev->pci_dev = pci_dev;891	pci_set_drvdata(pci_dev, dev);892 893	nand_controller_init(&dev->controller);894	dev->controller.ops = &r852_ops;895	chip->controller = &dev->controller;896 897	dev->bounce_buffer = dma_alloc_coherent(&pci_dev->dev, R852_DMA_LEN,898		&dev->phys_bounce_buffer, GFP_KERNEL);899 900	if (!dev->bounce_buffer)901		goto error6;902 903 904	error = -ENODEV;905	dev->mmio = pci_ioremap_bar(pci_dev, 0);906 907	if (!dev->mmio)908		goto error7;909 910	error = -ENOMEM;911	dev->tmp_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL);912 913	if (!dev->tmp_buffer)914		goto error8;915 916	init_completion(&dev->dma_done);917 918	dev->card_workqueue = create_freezable_workqueue(DRV_NAME);919 920	if (!dev->card_workqueue)921		goto error9;922 923	INIT_DELAYED_WORK(&dev->card_detect_work, r852_card_detect_work);924 925	/* shutdown everything - precation */926	r852_engine_disable(dev);927	r852_disable_irqs(dev);928 929	r852_dma_test(dev);930 931	dev->irq = pci_dev->irq;932	spin_lock_init(&dev->irqlock);933 934	dev->card_detected = 0;935	r852_card_update_present(dev);936 937	/*register irq handler*/938	error = -ENODEV;939	if (request_irq(pci_dev->irq, &r852_irq, IRQF_SHARED,940			  DRV_NAME, dev))941		goto error10;942 943	/* kick initial present test */944	queue_delayed_work(dev->card_workqueue,945		&dev->card_detect_work, 0);946 947 948	pr_notice("driver loaded successfully\n");949	return 0;950 951error10:952	destroy_workqueue(dev->card_workqueue);953error9:954	kfree(dev->tmp_buffer);955error8:956	pci_iounmap(pci_dev, dev->mmio);957error7:958	dma_free_coherent(&pci_dev->dev, R852_DMA_LEN, dev->bounce_buffer,959			  dev->phys_bounce_buffer);960error6:961	kfree(dev);962error5:963	kfree(chip);964error4:965	pci_release_regions(pci_dev);966error3:967error2:968	pci_disable_device(pci_dev);969error1:970	return error;971}972 973static void r852_remove(struct pci_dev *pci_dev)974{975	struct r852_device *dev = pci_get_drvdata(pci_dev);976 977	/* Stop detect workqueue -978		we are going to unregister the device anyway*/979	cancel_delayed_work_sync(&dev->card_detect_work);980	destroy_workqueue(dev->card_workqueue);981 982	/* Unregister the device, this might make more IO */983	r852_unregister_nand_device(dev);984 985	/* Stop interrupts */986	r852_disable_irqs(dev);987	free_irq(dev->irq, dev);988 989	/* Cleanup */990	kfree(dev->tmp_buffer);991	pci_iounmap(pci_dev, dev->mmio);992	dma_free_coherent(&pci_dev->dev, R852_DMA_LEN, dev->bounce_buffer,993			  dev->phys_bounce_buffer);994 995	kfree(dev->chip);996	kfree(dev);997 998	/* Shutdown the PCI device */999	pci_release_regions(pci_dev);1000	pci_disable_device(pci_dev);1001}1002 1003static void r852_shutdown(struct pci_dev *pci_dev)1004{1005	struct r852_device *dev = pci_get_drvdata(pci_dev);1006 1007	cancel_delayed_work_sync(&dev->card_detect_work);1008	r852_disable_irqs(dev);1009	synchronize_irq(dev->irq);1010	pci_disable_device(pci_dev);1011}1012 1013#ifdef CONFIG_PM_SLEEP1014static int r852_suspend(struct device *device)1015{1016	struct r852_device *dev = dev_get_drvdata(device);1017 1018	if (dev->ctlreg & R852_CTL_CARDENABLE)1019		return -EBUSY;1020 1021	/* First make sure the detect work is gone */1022	cancel_delayed_work_sync(&dev->card_detect_work);1023 1024	/* Turn off the interrupts and stop the device */1025	r852_disable_irqs(dev);1026	r852_engine_disable(dev);1027 1028	/* If card was pulled off just during the suspend, which is very1029		unlikely, we will remove it on resume, it too late now1030		anyway... */1031	dev->card_unstable = 0;1032	return 0;1033}1034 1035static int r852_resume(struct device *device)1036{1037	struct r852_device *dev = dev_get_drvdata(device);1038 1039	r852_disable_irqs(dev);1040	r852_card_update_present(dev);1041	r852_engine_disable(dev);1042 1043 1044	/* If card status changed, just do the work */1045	if (dev->card_detected != dev->card_registered) {1046		dbg("card was %s during low power state",1047			dev->card_detected ? "added" : "removed");1048 1049		queue_delayed_work(dev->card_workqueue,1050		&dev->card_detect_work, msecs_to_jiffies(1000));1051		return 0;1052	}1053 1054	/* Otherwise, initialize the card */1055	if (dev->card_registered) {1056		r852_engine_enable(dev);1057		nand_select_target(dev->chip, 0);1058		nand_reset_op(dev->chip);1059		nand_deselect_target(dev->chip);1060	}1061 1062	/* Program card detection IRQ */1063	r852_update_card_detect(dev);1064	return 0;1065}1066#endif1067 1068static const struct pci_device_id r852_pci_id_tbl[] = {1069 1070	{ PCI_VDEVICE(RICOH, 0x0852), },1071	{ },1072};1073 1074MODULE_DEVICE_TABLE(pci, r852_pci_id_tbl);1075 1076static SIMPLE_DEV_PM_OPS(r852_pm_ops, r852_suspend, r852_resume);1077 1078static struct pci_driver r852_pci_driver = {1079	.name		= DRV_NAME,1080	.id_table	= r852_pci_id_tbl,1081	.probe		= r852_probe,1082	.remove		= r852_remove,1083	.shutdown	= r852_shutdown,1084	.driver.pm	= &r852_pm_ops,1085};1086 1087module_pci_driver(r852_pci_driver);1088 1089MODULE_LICENSE("GPL");1090MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");1091MODULE_DESCRIPTION("Ricoh 85xx xD/smartmedia card reader driver");1092