forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
linux-pinenote/drivers/mtd/nand/r852.c
Brian Norris ab7f6fcec3 mtd: nand: r852: correct write_buf loop bounds 
The two loops in r852_write_buf() are designed to handle 4-byte-aligned
and then 1-byte-aligned portions, respectively. However, there are two
issues:

(1) The first loop will only terminate if 'len' is a multiple of 4
(2) The second loop will never terminate if it runs at least once

Rewrite these loops as they were probably intended. Compile tested only.

Issues pointed out by Coverity Scan.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
2014-05-28 00:05:26 -07:00

1085 lines
25 KiB
C
Raw Blame History

/*
* Copyright © 2009 - Maxim Levitsky
* driver for Ricoh xD readers
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <linux/sched.h>
#include "sm_common.h"
#include "r852.h"
static bool r852_enable_dma = 1;
module_param(r852_enable_dma, bool, S_IRUGO);
MODULE_PARM_DESC(r852_enable_dma, "Enable usage of the DMA (default)");
static int debug;
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug level (0-2)");
/* read register */
static inline uint8_t r852_read_reg(struct r852_device *dev, int address)
{
uint8_t reg = readb(dev->mmio + address);
return reg;
}
/* write register */
static inline void r852_write_reg(struct r852_device *dev,
int address, uint8_t value)
{
writeb(value, dev->mmio + address);
mmiowb();
}
/* read dword sized register */
static inline uint32_t r852_read_reg_dword(struct r852_device *dev, int address)
{
uint32_t reg = le32_to_cpu(readl(dev->mmio + address));
return reg;
}
/* write dword sized register */
static inline void r852_write_reg_dword(struct r852_device *dev,
int address, uint32_t value)
{
writel(cpu_to_le32(value), dev->mmio + address);
mmiowb();
}
/* returns pointer to our private structure */
static inline struct r852_device *r852_get_dev(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
return chip->priv;
}
/* check if controller supports dma */
static void r852_dma_test(struct r852_device *dev)
{
dev->dma_usable = (r852_read_reg(dev, R852_DMA_CAP) &
(R852_DMA1 | R852_DMA2)) == (R852_DMA1 | R852_DMA2);
if (!dev->dma_usable)
message("Non dma capable device detected, dma disabled");
if (!r852_enable_dma) {
message("disabling dma on user request");
dev->dma_usable = 0;
}
}
/*
* Enable dma. Enables ether first or second stage of the DMA,
* Expects dev->dma_dir and dev->dma_state be set
*/
static void r852_dma_enable(struct r852_device *dev)
{
uint8_t dma_reg, dma_irq_reg;
/* Set up dma settings */
dma_reg = r852_read_reg_dword(dev, R852_DMA_SETTINGS);
dma_reg &= ~(R852_DMA_READ | R852_DMA_INTERNAL | R852_DMA_MEMORY);
if (dev->dma_dir)
dma_reg |= R852_DMA_READ;
if (dev->dma_state == DMA_INTERNAL) {
dma_reg |= R852_DMA_INTERNAL;
/* Precaution to make sure HW doesn't write */
/* to random kernel memory */
r852_write_reg_dword(dev, R852_DMA_ADDR,
cpu_to_le32(dev->phys_bounce_buffer));
} else {
dma_reg |= R852_DMA_MEMORY;
r852_write_reg_dword(dev, R852_DMA_ADDR,
cpu_to_le32(dev->phys_dma_addr));
}
/* Precaution: make sure write reached the device */
r852_read_reg_dword(dev, R852_DMA_ADDR);
r852_write_reg_dword(dev, R852_DMA_SETTINGS, dma_reg);
/* Set dma irq */
dma_irq_reg = r852_read_reg_dword(dev, R852_DMA_IRQ_ENABLE);
r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE,
dma_irq_reg |
R852_DMA_IRQ_INTERNAL |
R852_DMA_IRQ_ERROR |
R852_DMA_IRQ_MEMORY);
}
/*
* Disable dma, called from the interrupt handler, which specifies
* success of the operation via 'error' argument
*/
static void r852_dma_done(struct r852_device *dev, int error)
{
WARN_ON(dev->dma_stage == 0);
r852_write_reg_dword(dev, R852_DMA_IRQ_STA,
r852_read_reg_dword(dev, R852_DMA_IRQ_STA));
r852_write_reg_dword(dev, R852_DMA_SETTINGS, 0);
r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE, 0);
/* Precaution to make sure HW doesn't write to random kernel memory */
r852_write_reg_dword(dev, R852_DMA_ADDR,
cpu_to_le32(dev->phys_bounce_buffer));
r852_read_reg_dword(dev, R852_DMA_ADDR);
dev->dma_error = error;
dev->dma_stage = 0;
if (dev->phys_dma_addr && dev->phys_dma_addr != dev->phys_bounce_buffer)
pci_unmap_single(dev->pci_dev, dev->phys_dma_addr, R852_DMA_LEN,
dev->dma_dir ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
}
/*
* Wait, till dma is done, which includes both phases of it
*/
static int r852_dma_wait(struct r852_device *dev)
{
long timeout = wait_for_completion_timeout(&dev->dma_done,
msecs_to_jiffies(1000));
if (!timeout) {
dbg("timeout waiting for DMA interrupt");
return -ETIMEDOUT;
}
return 0;
}
/*
* Read/Write one page using dma. Only pages can be read (512 bytes)
*/
static void r852_do_dma(struct r852_device *dev, uint8_t *buf, int do_read)
{
int bounce = 0;
unsigned long flags;
int error;
dev->dma_error = 0;
/* Set dma direction */
dev->dma_dir = do_read;
dev->dma_stage = 1;
reinit_completion(&dev->dma_done);
dbg_verbose("doing dma %s ", do_read ? "read" : "write");
/* Set initial dma state: for reading first fill on board buffer,
from device, for writes first fill the buffer from memory*/
dev->dma_state = do_read ? DMA_INTERNAL : DMA_MEMORY;
/* if incoming buffer is not page aligned, we should do bounce */
if ((unsigned long)buf & (R852_DMA_LEN-1))
bounce = 1;
if (!bounce) {
dev->phys_dma_addr = pci_map_single(dev->pci_dev, (void *)buf,
R852_DMA_LEN,
(do_read ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE));
if (pci_dma_mapping_error(dev->pci_dev, dev->phys_dma_addr))
bounce = 1;
}
if (bounce) {
dbg_verbose("dma: using bounce buffer");
dev->phys_dma_addr = dev->phys_bounce_buffer;
if (!do_read)
memcpy(dev->bounce_buffer, buf, R852_DMA_LEN);
}
/* Enable DMA */
spin_lock_irqsave(&dev->irqlock, flags);
r852_dma_enable(dev);
spin_unlock_irqrestore(&dev->irqlock, flags);
/* Wait till complete */
error = r852_dma_wait(dev);
if (error) {
r852_dma_done(dev, error);
return;
}
if (do_read && bounce)
memcpy((void *)buf, dev->bounce_buffer, R852_DMA_LEN);
}
/*
* Program data lines of the nand chip to send data to it
*/
static void r852_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
struct r852_device *dev = r852_get_dev(mtd);
uint32_t reg;
/* Don't allow any access to hardware if we suspect card removal */
if (dev->card_unstable)
return;
/* Special case for whole sector read */
if (len == R852_DMA_LEN && dev->dma_usable) {
r852_do_dma(dev, (uint8_t *)buf, 0);
return;
}
/* write DWORD chinks - faster */
while (len >= 4) {
reg = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
r852_write_reg_dword(dev, R852_DATALINE, reg);
buf += 4;
len -= 4;
}
/* write rest */
while (len > 0) {
r852_write_reg(dev, R852_DATALINE, *buf++);
len--;
}
}
/*
* Read data lines of the nand chip to retrieve data
*/
static void r852_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct r852_device *dev = r852_get_dev(mtd);
uint32_t reg;
if (dev->card_unstable) {
/* since we can't signal error here, at least, return
predictable buffer */
memset(buf, 0, len);
return;
}
/* special case for whole sector read */
if (len == R852_DMA_LEN && dev->dma_usable) {
r852_do_dma(dev, buf, 1);
return;
}
/* read in dword sized chunks */
while (len >= 4) {
reg = r852_read_reg_dword(dev, R852_DATALINE);
*buf++ = reg & 0xFF;
*buf++ = (reg >> 8) & 0xFF;
*buf++ = (reg >> 16) & 0xFF;
*buf++ = (reg >> 24) & 0xFF;
len -= 4;
}
/* read the reset by bytes */
while (len--)
*buf++ = r852_read_reg(dev, R852_DATALINE);
}
/*
* Read one byte from nand chip
*/
static uint8_t r852_read_byte(struct mtd_info *mtd)
{
struct r852_device *dev = r852_get_dev(mtd);
/* Same problem as in r852_read_buf.... */
if (dev->card_unstable)
return 0;
return r852_read_reg(dev, R852_DATALINE);
}
/*
* Control several chip lines & send commands
*/
static void r852_cmdctl(struct mtd_info *mtd, int dat, unsigned int ctrl)
{
struct r852_device *dev = r852_get_dev(mtd);
if (dev->card_unstable)
return;
if (ctrl & NAND_CTRL_CHANGE) {
dev->ctlreg &= ~(R852_CTL_DATA | R852_CTL_COMMAND |
R852_CTL_ON | R852_CTL_CARDENABLE);
if (ctrl & NAND_ALE)
dev->ctlreg |= R852_CTL_DATA;
if (ctrl & NAND_CLE)
dev->ctlreg |= R852_CTL_COMMAND;
if (ctrl & NAND_NCE)
dev->ctlreg |= (R852_CTL_CARDENABLE | R852_CTL_ON);
else
dev->ctlreg &= ~R852_CTL_WRITE;
/* when write is stareted, enable write access */
if (dat == NAND_CMD_ERASE1)
dev->ctlreg |= R852_CTL_WRITE;
r852_write_reg(dev, R852_CTL, dev->ctlreg);
}
/* HACK: NAND_CMD_SEQIN is called without NAND_CTRL_CHANGE, but we need
to set write mode */
if (dat == NAND_CMD_SEQIN && (dev->ctlreg & R852_CTL_COMMAND)) {
dev->ctlreg |= R852_CTL_WRITE;
r852_write_reg(dev, R852_CTL, dev->ctlreg);
}
if (dat != NAND_CMD_NONE)
r852_write_reg(dev, R852_DATALINE, dat);
}
/*
* Wait till card is ready.
* based on nand_wait, but returns errors on DMA error
*/
static int r852_wait(struct mtd_info *mtd, struct nand_chip *chip)
{
struct r852_device *dev = chip->priv;
unsigned long timeout;
int status;
timeout = jiffies + (chip->state == FL_ERASING ?
msecs_to_jiffies(400) : msecs_to_jiffies(20));
while (time_before(jiffies, timeout))
if (chip->dev_ready(mtd))
break;
chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
status = (int)chip->read_byte(mtd);
/* Unfortunelly, no way to send detailed error status... */
if (dev->dma_error) {
status |= NAND_STATUS_FAIL;
dev->dma_error = 0;
}
return status;
}
/*
* Check if card is ready
*/
static int r852_ready(struct mtd_info *mtd)
{
struct r852_device *dev = r852_get_dev(mtd);
return !(r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_BUSY);
}
/*
* Set ECC engine mode
*/
static void r852_ecc_hwctl(struct mtd_info *mtd, int mode)
{
struct r852_device *dev = r852_get_dev(mtd);
if (dev->card_unstable)
return;
switch (mode) {
case NAND_ECC_READ:
case NAND_ECC_WRITE:
/* enable ecc generation/check*/
dev->ctlreg |= R852_CTL_ECC_ENABLE;
/* flush ecc buffer */
r852_write_reg(dev, R852_CTL,
dev->ctlreg | R852_CTL_ECC_ACCESS);
r852_read_reg_dword(dev, R852_DATALINE);
r852_write_reg(dev, R852_CTL, dev->ctlreg);
return;
case NAND_ECC_READSYN:
/* disable ecc generation */
dev->ctlreg &= ~R852_CTL_ECC_ENABLE;
r852_write_reg(dev, R852_CTL, dev->ctlreg);
}
}
/*
* Calculate ECC, only used for writes
*/
static int r852_ecc_calculate(struct mtd_info *mtd, const uint8_t *dat,
uint8_t *ecc_code)
{
struct r852_device *dev = r852_get_dev(mtd);
struct sm_oob *oob = (struct sm_oob *)ecc_code;
uint32_t ecc1, ecc2;
if (dev->card_unstable)
return 0;
dev->ctlreg &= ~R852_CTL_ECC_ENABLE;
r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);
ecc1 = r852_read_reg_dword(dev, R852_DATALINE);
ecc2 = r852_read_reg_dword(dev, R852_DATALINE);
oob->ecc1[0] = (ecc1) & 0xFF;
oob->ecc1[1] = (ecc1 >> 8) & 0xFF;
oob->ecc1[2] = (ecc1 >> 16) & 0xFF;
oob->ecc2[0] = (ecc2) & 0xFF;
oob->ecc2[1] = (ecc2 >> 8) & 0xFF;
oob->ecc2[2] = (ecc2 >> 16) & 0xFF;
r852_write_reg(dev, R852_CTL, dev->ctlreg);
return 0;
}
/*
* Correct the data using ECC, hw did almost everything for us
*/
static int r852_ecc_correct(struct mtd_info *mtd, uint8_t *dat,
uint8_t *read_ecc, uint8_t *calc_ecc)
{
uint16_t ecc_reg;
uint8_t ecc_status, err_byte;
int i, error = 0;
struct r852_device *dev = r852_get_dev(mtd);
if (dev->card_unstable)
return 0;
if (dev->dma_error) {
dev->dma_error = 0;
return -1;
}
r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);
ecc_reg = r852_read_reg_dword(dev, R852_DATALINE);
r852_write_reg(dev, R852_CTL, dev->ctlreg);
for (i = 0 ; i <= 1 ; i++) {
ecc_status = (ecc_reg >> 8) & 0xFF;
/* ecc uncorrectable error */
if (ecc_status & R852_ECC_FAIL) {
dbg("ecc: unrecoverable error, in half %d", i);
error = -1;
goto exit;
}
/* correctable error */
if (ecc_status & R852_ECC_CORRECTABLE) {
err_byte = ecc_reg & 0xFF;
dbg("ecc: recoverable error, "
"in half %d, byte %d, bit %d", i,
err_byte, ecc_status & R852_ECC_ERR_BIT_MSK);
dat[err_byte] ^=
1 << (ecc_status & R852_ECC_ERR_BIT_MSK);
error++;
}
dat += 256;
ecc_reg >>= 16;
}
exit:
return error;
}
/*
* This is copy of nand_read_oob_std
* nand_read_oob_syndrome assumes we can send column address - we can't
*/
static int r852_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
int page)
{
chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
/*
* Start the nand engine
*/
static void r852_engine_enable(struct r852_device *dev)
{
if (r852_read_reg_dword(dev, R852_HW) & R852_HW_UNKNOWN) {
r852_write_reg(dev, R852_CTL, R852_CTL_RESET | R852_CTL_ON);
r852_write_reg_dword(dev, R852_HW, R852_HW_ENABLED);
} else {
r852_write_reg_dword(dev, R852_HW, R852_HW_ENABLED);
r852_write_reg(dev, R852_CTL, R852_CTL_RESET | R852_CTL_ON);
}
msleep(300);
r852_write_reg(dev, R852_CTL, 0);
}
/*
* Stop the nand engine
*/
static void r852_engine_disable(struct r852_device *dev)
{
r852_write_reg_dword(dev, R852_HW, 0);
r852_write_reg(dev, R852_CTL, R852_CTL_RESET);
}
/*
* Test if card is present
*/
static void r852_card_update_present(struct r852_device *dev)
{
unsigned long flags;
uint8_t reg;
spin_lock_irqsave(&dev->irqlock, flags);
reg = r852_read_reg(dev, R852_CARD_STA);
dev->card_detected = !!(reg & R852_CARD_STA_PRESENT);
spin_unlock_irqrestore(&dev->irqlock, flags);
}
/*
* Update card detection IRQ state according to current card state
* which is read in r852_card_update_present
*/
static void r852_update_card_detect(struct r852_device *dev)
{
int card_detect_reg = r852_read_reg(dev, R852_CARD_IRQ_ENABLE);
dev->card_unstable = 0;
card_detect_reg &= ~(R852_CARD_IRQ_REMOVE | R852_CARD_IRQ_INSERT);
card_detect_reg |= R852_CARD_IRQ_GENABLE;
card_detect_reg |= dev->card_detected ?
R852_CARD_IRQ_REMOVE : R852_CARD_IRQ_INSERT;
r852_write_reg(dev, R852_CARD_IRQ_ENABLE, card_detect_reg);
}
static ssize_t r852_media_type_show(struct device *sys_dev,
struct device_attribute *attr, char *buf)
{
struct mtd_info *mtd = container_of(sys_dev, struct mtd_info, dev);
struct r852_device *dev = r852_get_dev(mtd);
char *data = dev->sm ? "smartmedia" : "xd";
strcpy(buf, data);
return strlen(data);
}
static DEVICE_ATTR(media_type, S_IRUGO, r852_media_type_show, NULL);
/* Detect properties of card in slot */
static void r852_update_media_status(struct r852_device *dev)
{
uint8_t reg;
unsigned long flags;
int readonly;
spin_lock_irqsave(&dev->irqlock, flags);
if (!dev->card_detected) {
message("card removed");
spin_unlock_irqrestore(&dev->irqlock, flags);
return ;
}
readonly = r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_RO;
reg = r852_read_reg(dev, R852_DMA_CAP);
dev->sm = (reg & (R852_DMA1 | R852_DMA2)) && (reg & R852_SMBIT);
message("detected %s %s card in slot",
dev->sm ? "SmartMedia" : "xD",
readonly ? "readonly" : "writeable");
dev->readonly = readonly;
spin_unlock_irqrestore(&dev->irqlock, flags);
}
/*
* Register the nand device
* Called when the card is detected
*/
static int r852_register_nand_device(struct r852_device *dev)
{
dev->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (!dev->mtd)
goto error1;
WARN_ON(dev->card_registred);
dev->mtd->owner = THIS_MODULE;
dev->mtd->priv = dev->chip;
dev->mtd->dev.parent = &dev->pci_dev->dev;
if (dev->readonly)
dev->chip->options |= NAND_ROM;
r852_engine_enable(dev);
if (sm_register_device(dev->mtd, dev->sm))
goto error2;
if (device_create_file(&dev->mtd->dev, &dev_attr_media_type))
message("can't create media type sysfs attribute");
dev->card_registred = 1;
return 0;
error2:
kfree(dev->mtd);
error1:
/* Force card redetect */
dev->card_detected = 0;
return -1;
}
/*
* Unregister the card
*/
static void r852_unregister_nand_device(struct r852_device *dev)
{
if (!dev->card_registred)
return;
device_remove_file(&dev->mtd->dev, &dev_attr_media_type);
nand_release(dev->mtd);
r852_engine_disable(dev);
dev->card_registred = 0;
kfree(dev->mtd);
dev->mtd = NULL;
}
/* Card state updater */
static void r852_card_detect_work(struct work_struct *work)
{
struct r852_device *dev =
container_of(work, struct r852_device, card_detect_work.work);
r852_card_update_present(dev);
r852_update_card_detect(dev);
dev->card_unstable = 0;
/* False alarm */
if (dev->card_detected == dev->card_registred)
goto exit;
/* Read media properties */
r852_update_media_status(dev);
/* Register the card */
if (dev->card_detected)
r852_register_nand_device(dev);
else
r852_unregister_nand_device(dev);
exit:
r852_update_card_detect(dev);
}
/* Ack + disable IRQ generation */
static void r852_disable_irqs(struct r852_device *dev)
{
uint8_t reg;
reg = r852_read_reg(dev, R852_CARD_IRQ_ENABLE);
r852_write_reg(dev, R852_CARD_IRQ_ENABLE, reg & ~R852_CARD_IRQ_MASK);
reg = r852_read_reg_dword(dev, R852_DMA_IRQ_ENABLE);
r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE,
reg & ~R852_DMA_IRQ_MASK);
r852_write_reg(dev, R852_CARD_IRQ_STA, R852_CARD_IRQ_MASK);
r852_write_reg_dword(dev, R852_DMA_IRQ_STA, R852_DMA_IRQ_MASK);
}
/* Interrupt handler */
static irqreturn_t r852_irq(int irq, void *data)
{
struct r852_device *dev = (struct r852_device *)data;
uint8_t card_status, dma_status;
unsigned long flags;
irqreturn_t ret = IRQ_NONE;
spin_lock_irqsave(&dev->irqlock, flags);
/* handle card detection interrupts first */
card_status = r852_read_reg(dev, R852_CARD_IRQ_STA);
r852_write_reg(dev, R852_CARD_IRQ_STA, card_status);
if (card_status & (R852_CARD_IRQ_INSERT|R852_CARD_IRQ_REMOVE)) {
ret = IRQ_HANDLED;
dev->card_detected = !!(card_status & R852_CARD_IRQ_INSERT);
/* we shouldn't receive any interrupts if we wait for card
to settle */
WARN_ON(dev->card_unstable);
/* disable irqs while card is unstable */
/* this will timeout DMA if active, but better that garbage */
r852_disable_irqs(dev);
if (dev->card_unstable)
goto out;
/* let, card state to settle a bit, and then do the work */
dev->card_unstable = 1;
queue_delayed_work(dev->card_workqueue,
&dev->card_detect_work, msecs_to_jiffies(100));
goto out;
}
/* Handle dma interrupts */
dma_status = r852_read_reg_dword(dev, R852_DMA_IRQ_STA);
r852_write_reg_dword(dev, R852_DMA_IRQ_STA, dma_status);
if (dma_status & R852_DMA_IRQ_MASK) {
ret = IRQ_HANDLED;
if (dma_status & R852_DMA_IRQ_ERROR) {
dbg("received dma error IRQ");
r852_dma_done(dev, -EIO);
complete(&dev->dma_done);
goto out;
}
/* received DMA interrupt out of nowhere? */
WARN_ON_ONCE(dev->dma_stage == 0);
if (dev->dma_stage == 0)
goto out;
/* done device access */
if (dev->dma_state == DMA_INTERNAL &&
(dma_status & R852_DMA_IRQ_INTERNAL)) {
dev->dma_state = DMA_MEMORY;
dev->dma_stage++;
}
/* done memory DMA */
if (dev->dma_state == DMA_MEMORY &&
(dma_status & R852_DMA_IRQ_MEMORY)) {
dev->dma_state = DMA_INTERNAL;
dev->dma_stage++;
}
/* Enable 2nd half of dma dance */
if (dev->dma_stage == 2)
r852_dma_enable(dev);
/* Operation done */
if (dev->dma_stage == 3) {
r852_dma_done(dev, 0);
complete(&dev->dma_done);
}
goto out;
}
/* Handle unknown interrupts */
if (dma_status)
dbg("bad dma IRQ status = %x", dma_status);
if (card_status & ~R852_CARD_STA_CD)
dbg("strange card status = %x", card_status);
out:
spin_unlock_irqrestore(&dev->irqlock, flags);
return ret;
}
static int r852_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
{
int error;
struct nand_chip *chip;
struct r852_device *dev;
/* pci initialization */
error = pci_enable_device(pci_dev);
if (error)
goto error1;
pci_set_master(pci_dev);
error = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
if (error)
goto error2;
error = pci_request_regions(pci_dev, DRV_NAME);
if (error)
goto error3;
error = -ENOMEM;
/* init nand chip, but register it only on card insert */
chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
if (!chip)
goto error4;
/* commands */
chip->cmd_ctrl = r852_cmdctl;
chip->waitfunc = r852_wait;
chip->dev_ready = r852_ready;
/* I/O */
chip->read_byte = r852_read_byte;
chip->read_buf = r852_read_buf;
chip->write_buf = r852_write_buf;
/* ecc */
chip->ecc.mode = NAND_ECC_HW_SYNDROME;
chip->ecc.size = R852_DMA_LEN;
chip->ecc.bytes = SM_OOB_SIZE;
chip->ecc.strength = 2;
chip->ecc.hwctl = r852_ecc_hwctl;
chip->ecc.calculate = r852_ecc_calculate;
chip->ecc.correct = r852_ecc_correct;
/* TODO: hack */
chip->ecc.read_oob = r852_read_oob;
/* init our device structure */
dev = kzalloc(sizeof(struct r852_device), GFP_KERNEL);
if (!dev)
goto error5;
chip->priv = dev;
dev->chip = chip;
dev->pci_dev = pci_dev;
pci_set_drvdata(pci_dev, dev);
dev->bounce_buffer = pci_alloc_consistent(pci_dev, R852_DMA_LEN,
&dev->phys_bounce_buffer);
if (!dev->bounce_buffer)
goto error6;
error = -ENODEV;
dev->mmio = pci_ioremap_bar(pci_dev, 0);
if (!dev->mmio)
goto error7;
error = -ENOMEM;
dev->tmp_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL);
if (!dev->tmp_buffer)
goto error8;
init_completion(&dev->dma_done);
dev->card_workqueue = create_freezable_workqueue(DRV_NAME);
if (!dev->card_workqueue)
goto error9;
INIT_DELAYED_WORK(&dev->card_detect_work, r852_card_detect_work);
/* shutdown everything - precation */
r852_engine_disable(dev);
r852_disable_irqs(dev);
r852_dma_test(dev);
dev->irq = pci_dev->irq;
spin_lock_init(&dev->irqlock);
dev->card_detected = 0;
r852_card_update_present(dev);
/*register irq handler*/
error = -ENODEV;
if (request_irq(pci_dev->irq, &r852_irq, IRQF_SHARED,
DRV_NAME, dev))
goto error10;
/* kick initial present test */
queue_delayed_work(dev->card_workqueue,
&dev->card_detect_work, 0);
printk(KERN_NOTICE DRV_NAME ": driver loaded successfully\n");
return 0;
error10:
destroy_workqueue(dev->card_workqueue);
error9:
kfree(dev->tmp_buffer);
error8:
pci_iounmap(pci_dev, dev->mmio);
error7:
pci_free_consistent(pci_dev, R852_DMA_LEN,
dev->bounce_buffer, dev->phys_bounce_buffer);
error6:
kfree(dev);
error5:
kfree(chip);
error4:
pci_release_regions(pci_dev);
error3:
error2:
pci_disable_device(pci_dev);
error1:
return error;
}
static void r852_remove(struct pci_dev *pci_dev)
{
struct r852_device *dev = pci_get_drvdata(pci_dev);
/* Stop detect workqueue -
we are going to unregister the device anyway*/
cancel_delayed_work_sync(&dev->card_detect_work);
destroy_workqueue(dev->card_workqueue);
/* Unregister the device, this might make more IO */
r852_unregister_nand_device(dev);
/* Stop interrupts */
r852_disable_irqs(dev);
synchronize_irq(dev->irq);
free_irq(dev->irq, dev);
/* Cleanup */
kfree(dev->tmp_buffer);
pci_iounmap(pci_dev, dev->mmio);
pci_free_consistent(pci_dev, R852_DMA_LEN,
dev->bounce_buffer, dev->phys_bounce_buffer);
kfree(dev->chip);
kfree(dev);
/* Shutdown the PCI device */
pci_release_regions(pci_dev);
pci_disable_device(pci_dev);
}
static void r852_shutdown(struct pci_dev *pci_dev)
{
struct r852_device *dev = pci_get_drvdata(pci_dev);
cancel_delayed_work_sync(&dev->card_detect_work);
r852_disable_irqs(dev);
synchronize_irq(dev->irq);
pci_disable_device(pci_dev);
}
#ifdef CONFIG_PM_SLEEP
static int r852_suspend(struct device *device)
{
struct r852_device *dev = pci_get_drvdata(to_pci_dev(device));
if (dev->ctlreg & R852_CTL_CARDENABLE)
return -EBUSY;
/* First make sure the detect work is gone */
cancel_delayed_work_sync(&dev->card_detect_work);
/* Turn off the interrupts and stop the device */
r852_disable_irqs(dev);
r852_engine_disable(dev);
/* If card was pulled off just during the suspend, which is very
unlikely, we will remove it on resume, it too late now
anyway... */
dev->card_unstable = 0;
return 0;
}
static int r852_resume(struct device *device)
{
struct r852_device *dev = pci_get_drvdata(to_pci_dev(device));
r852_disable_irqs(dev);
r852_card_update_present(dev);
r852_engine_disable(dev);
/* If card status changed, just do the work */
if (dev->card_detected != dev->card_registred) {
dbg("card was %s during low power state",
dev->card_detected ? "added" : "removed");
queue_delayed_work(dev->card_workqueue,
&dev->card_detect_work, msecs_to_jiffies(1000));
return 0;
}
/* Otherwise, initialize the card */
if (dev->card_registred) {
r852_engine_enable(dev);
dev->chip->select_chip(dev->mtd, 0);
dev->chip->cmdfunc(dev->mtd, NAND_CMD_RESET, -1, -1);
dev->chip->select_chip(dev->mtd, -1);
}
/* Program card detection IRQ */
r852_update_card_detect(dev);
return 0;
}
#endif
static const struct pci_device_id r852_pci_id_tbl[] = {
{ PCI_VDEVICE(RICOH, 0x0852), },
{ },
};
MODULE_DEVICE_TABLE(pci, r852_pci_id_tbl);
static SIMPLE_DEV_PM_OPS(r852_pm_ops, r852_suspend, r852_resume);
static struct pci_driver r852_pci_driver = {
.name = DRV_NAME,
.id_table = r852_pci_id_tbl,
.probe = r852_probe,
.remove = r852_remove,
.shutdown = r852_shutdown,
.driver.pm = &r852_pm_ops,
};
module_pci_driver(r852_pci_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
MODULE_DESCRIPTION("Ricoh 85xx xD/smartmedia card reader driver");
Reference in a new issue View git blame Copy permalink