diff options
Diffstat (limited to 'drivers/mtd/nand/r852.c')
| -rw-r--r-- | drivers/mtd/nand/r852.c | 1140 |
1 files changed, 1140 insertions, 0 deletions
diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c new file mode 100644 index 0000000..78a4232 --- /dev/null +++ b/drivers/mtd/nand/r852.c @@ -0,0 +1,1140 @@ +/* + * 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 int 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 = (struct nand_chip *)mtd->priv; + return (struct r852_device *)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); + complete(&dev->dma_done); +} + +/* + * 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; + + dbg_verbose("doing dma %s ", do_read ? "read" : "write"); + + /* Set intial 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 + */ +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) { + 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) + r852_write_reg(dev, R852_DATALINE, *buf++); +} + +/* + * Read data lines of the nand chip to retrieve data + */ +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); +} + + +/* + * Readback the buffer to verify it + */ +int r852_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len) +{ + struct r852_device *dev = r852_get_dev(mtd); + + /* We can't be sure about anything here... */ + if (dev->card_unstable) + return -1; + + /* This will never happen, unless you wired up a nand chip + with > 512 bytes page size to the reader */ + if (len > SM_SECTOR_SIZE) + return 0; + + r852_read_buf(mtd, dev->tmp_buffer, len); + return memcmp(buf, dev->tmp_buffer, len); +} + +/* + * Control several chip lines & send commands + */ +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 + */ +int r852_wait(struct mtd_info *mtd, struct nand_chip *chip) +{ + struct r852_device *dev = (struct r852_device *)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 + */ + +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 +*/ + +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 + */ + +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 + */ + +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; + + 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, int sndcmd) +{ + if (sndcmd) { + chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); + sndcmd = 0; + } + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); + return sndcmd; +} + +/* + * Start the nand engine + */ + +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 + */ + +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 + */ + +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 + */ +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); +} + +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); +} + +DEVICE_ATTR(media_type, S_IRUGO, r852_media_type_show, NULL); + + +/* Detect properties of card in slot */ +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 + */ +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 + */ + +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 */ +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); + 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: + /* Update detection logic */ + 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); + + /* We can recieve shared interrupt while pci is suspended + in that case reads will return 0xFFFFFFFF.... */ + if (dev->insuspend) + goto out; + + /* 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 recieve 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("recieved dma error IRQ"); + r852_dma_done(dev, -EIO); + goto out; + } + + /* recieved 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); + 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; +} + +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; + chip->verify_buf = r852_verify_buf; + + /* ecc */ + chip->ecc.mode = NAND_ECC_HW_SYNDROME; + chip->ecc.size = R852_DMA_LEN; + chip->ecc.bytes = SM_OOB_SIZE; + 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_freezeable_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); + + /*register irq handler*/ + error = -ENODEV; + if (request_irq(pci_dev->irq, &r852_irq, IRQF_SHARED, + DRV_NAME, dev)) + goto error10; + + dev->irq = pci_dev->irq; + spin_lock_init(&dev->irqlock); + + /* kick initial present test */ + dev->card_detected = 0; + r852_card_update_present(dev); + queue_delayed_work(dev->card_workqueue, + &dev->card_detect_work, 0); + + + printk(KERN_NOTICE DRV_NAME ": driver loaded succesfully\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; +} + +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); +} + +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 +int r852_suspend(struct device *device) +{ + struct r852_device *dev = pci_get_drvdata(to_pci_dev(device)); + unsigned long flags; + + 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); + + spin_lock_irqsave(&dev->irqlock, flags); + dev->insuspend = 1; + spin_unlock_irqrestore(&dev->irqlock, flags); + + /* At that point, even if interrupt handler is running, it will quit */ + /* So wait for this to happen explictly */ + synchronize_irq(dev->irq); + + /* 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; + + pci_save_state(to_pci_dev(device)); + return pci_prepare_to_sleep(to_pci_dev(device)); +} + +int r852_resume(struct device *device) +{ + struct r852_device *dev = pci_get_drvdata(to_pci_dev(device)); + unsigned long flags; + + /* Turn on the hardware */ + pci_back_from_sleep(to_pci_dev(device)); + pci_restore_state(to_pci_dev(device)); + + r852_disable_irqs(dev); + r852_card_update_present(dev); + r852_engine_disable(dev); + + + /* Now its safe for IRQ to run */ + spin_lock_irqsave(&dev->irqlock, flags); + dev->insuspend = 0; + spin_unlock_irqrestore(&dev->irqlock, flags); + + + /* 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, 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; +} +#else +#define r852_suspend NULL +#define r852_resume NULL +#endif + +static const struct pci_device_id r852_pci_id_tbl[] = { + + { PCI_VDEVICE(RICOH, 0x0852), }, + { }, +}; + +MODULE_DEVICE_TABLE(pci, r852_pci_id_tbl); + +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, +}; + +static __init int r852_module_init(void) +{ + return pci_register_driver(&r852_pci_driver); +} + +static void __exit r852_module_exit(void) +{ + pci_unregister_driver(&r852_pci_driver); +} + +module_init(r852_module_init); +module_exit(r852_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); +MODULE_DESCRIPTION("Ricoh 85xx xD/smartmedia card reader driver"); |