* [PATCH 1/2] MTD: Add nand driver for ricoh xD/SmartMedia reader
2010-01-22 16:12 [PATCH 0/2] Smartmedia/xD support Maxim Levitsky
@ 2010-01-22 16:14 ` Maxim Levitsky
2010-01-22 16:15 ` [PATCH 2/2] MTD: Add new SmartMedia/xD FTL Maxim Levitsky
1 sibling, 0 replies; 3+ messages in thread
From: Maxim Levitsky @ 2010-01-22 16:14 UTC (permalink / raw)
To: David Woodhouse
Cc: Thomas Gleixner, joern, linux-mtd, linux-kernel, Alex Dubov
>From 2c1feaad8347819ed2dcc47c28e25c9c0ff57a3e Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Fri, 22 Jan 2010 16:42:09 +0200
Subject: [PATCH 1/2] MTD: Add nand driver for ricoh xD/SmartMedia reader
This adds a driver for Ricoh xD card reader with PCI id 0x0852
Since the reader is a part of larger mulifunction chip, it
is hard to determine the correct model name. Might be R5C852.
Driver is complete, but bewere of the fact that some
(probably only type M) xD cards are 'fake' which means that
they have an on board CPU and expose emulated nand command set
These cards don't even store the oob area on the flash,
but generate it on the fly from something else.
Thus they demand to have proper values written in the oob area,
and therefore only useful with SmartMedia FTL.
Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
MAINTAINERS | 6 +
drivers/mtd/nand/Kconfig | 11 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/r822.c | 1086 +++++++++++++++++++++++++++++++++++++++++++++
drivers/mtd/nand/r822.h | 152 +++++++
include/linux/pci_ids.h | 2 +
6 files changed, 1258 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/nand/r822.c
create mode 100644 drivers/mtd/nand/r822.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 8f0109b..81c451b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4585,6 +4585,12 @@ S: Maintained
F: Documentation/rfkill.txt
F: net/rfkill/
+RICOH SMARTMEDIA/XD DRIVER
+M: Maxim Levitsky <maximlevitsky@gmail.com>
+S: Maintained
+F: drivers/mtd/nand/r822.c
+F: drivers/mtd/nand/r822.h
+
RISCOM8 DRIVER
S: Orphan
F: Documentation/serial/riscom8.txt
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 13c1fb2..20803fa 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -113,6 +113,17 @@ config MTD_NAND_TS7250
config MTD_NAND_IDS
tristate
+config MTD_NAND_RICOH
+ tristate "Ricoh xD card reader"
+ default n
+ select MTD_SM_COMMON
+ help
+ Enable support for Ricoh xD card reader
+ You also need to enable ether
+ NAND SSFDC (SmartMedia) read only translation layer' or new
+ expermental, readwrite
+ 'SmartMedia/xD new translation layer'
+
config MTD_NAND_AU1550
tristate "Au1550/1200 NAND support"
depends on SOC_AU1200 || SOC_AU1550
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 09891f6..dc7c0bb 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -43,5 +43,6 @@ obj-$(CONFIG_MTD_NAND_TXX9NDFMC) += txx9ndfmc.o
obj-$(CONFIG_MTD_NAND_W90P910) += w90p910_nand.o
obj-$(CONFIG_MTD_NAND_NOMADIK) += nomadik_nand.o
obj-$(CONFIG_MTD_NAND_BCM_UMI) += bcm_umi_nand.o nand_bcm_umi.o
+obj-$(CONFIG_MTD_NAND_RICOH) += r822.o
nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/r822.c b/drivers/mtd/nand/r822.c
new file mode 100644
index 0000000..99ad3f4
--- /dev/null
+++ b/drivers/mtd/nand/r822.c
@@ -0,0 +1,1086 @@
+/*
+ * Copyright (C) 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_ids.h>
+#include <asm/byteorder.h>
+#include <linux/sched.h>
+#include "sm_common.h"
+#include "r822.h"
+
+
+static int enable_dma = 1;
+module_param(enable_dma, bool, S_IRUGO);
+MODULE_PARM_DESC(enable_dma, "Enable usage of DMA (default)");
+
+
+/* read register */
+static inline u8 r822_read_reg(struct r822_device *dev, int address)
+{
+ u8 reg = readb(dev->mmio + address);
+ return reg;
+}
+
+/* write register */
+static inline void r822_write_reg(struct r822_device *dev,
+ int address, u8 value)
+{
+ writeb(value, dev->mmio + address);
+}
+
+
+/* read dword sized register */
+static inline u32 r822_read_reg_dword(struct r822_device *dev, int address)
+{
+ u32 reg = le32_to_cpu(readl(dev->mmio + address));
+ return reg;
+}
+
+/* write dword sized register */
+static inline void r822_write_reg_dword(struct r822_device *dev,
+ int address, u32 value)
+{
+ writel(cpu_to_le32(value), dev->mmio + address);
+}
+
+/* returns pointer to our private structure */
+static inline struct r822_device *r822_get_dev(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+ return (struct r822_device *)chip->priv;
+}
+
+
+/* check if controller supports dma */
+static void r822_dma_test(struct r822_device *dev)
+{
+ dev->dma_usable = (r822_read_reg(dev, R822_DMA_CAP) &
+ (R822_DMA1 | R822_DMA2)) == (R822_DMA1 | R822_DMA2);
+
+ if (!dev->dma_usable)
+ dbg("Non dma capable device detected, dma disabled");
+
+ if (!enable_dma) {
+ dbg("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 r822_dma_enable(struct r822_device *dev)
+{
+ u8 dma_reg = dev->dma_dir ? R822_DMA_READ : 0;
+
+ if (dev->dma_state == DMA_INTERNAL)
+ dma_reg |= R822_DMA_INTERNAL;
+ else {
+ dma_reg |= R822_DMA_MEMORY;
+ r822_write_reg_dword(dev, R822_DMA_ADDR,
+ cpu_to_le32(dev->phys_dma_addr));
+ }
+
+ r822_write_reg(dev, R822_DMA_IRQ_STA,
+ r822_read_reg(dev, R822_DMA_IRQ_STA));
+
+ r822_write_reg(dev, R822_DMA_SETTINGS, dma_reg);
+ r822_write_reg(dev, R822_DMA_IRQ_ENABLE,
+ R822_DMA_IRQ_INTERNAL |
+ R822_DMA_IRQ_ERROR |
+ R822_DMA_IRQ_MEMORY);
+}
+
+/*
+ * Disable dma, called from the interrupt handler, which specifies
+ * success of the operation via 'error' argument
+ */
+static void r822_dma_done(struct r822_device *dev, int error)
+{
+ WARN_ON(dev->dma_stage == 0);
+
+ if (error)
+ dbg("dma: complete with error");
+
+ r822_write_reg(dev, R822_DMA_IRQ_STA,
+ r822_read_reg(dev, R822_DMA_IRQ_STA));
+
+ r822_write_reg(dev, R822_DMA_SETTINGS, 0);
+ r822_write_reg(dev, R822_DMA_IRQ_ENABLE, 0);
+
+ 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, R822_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 r822_dma_wait(struct r822_device *dev)
+{
+ long timeout = wait_for_completion_interruptible_timeout(&dev->dma_done,
+ msecs_to_jiffies(1000));
+ if (timeout < 0)
+ return -EAGAIN;
+ if (!timeout)
+ return -ETIMEDOUT;
+ return 0;
+}
+
+/*
+ * Read/Write one page using dma. Only pages can be read (512 bytes), oob
+ * can't be read here
+*/
+static void r822_do_dma(struct r822_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;
+
+ /* 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 & (R822_DMA_LEN-1))
+ bounce = 1;
+
+ if (!bounce) {
+ dev->phys_dma_addr = pci_map_single(dev->pci_dev, (void *)buf,
+ R822_DMA_LEN,
+ (do_read ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE));
+
+ if (dev->phys_dma_addr == DMA_ERROR_CODE)
+ bounce = 1;
+ }
+
+ if (bounce) {
+ dev->phys_dma_addr = dev->phys_bounce_buffer;
+
+ if (!do_read)
+ memcpy(dev->bounce_buffer, buf, R822_DMA_LEN);
+ }
+
+ /* Enable DMA */
+ spin_lock_irqsave(&dev->irqlock, flags);
+ r822_dma_enable(dev);
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+
+ /* Wait till complete */
+ error = r822_dma_wait(dev);
+
+ if (error) {
+ r822_dma_done(dev, error);
+ return;
+ }
+
+ if (do_read && bounce)
+ memcpy((void *)buf, dev->bounce_buffer, R822_DMA_LEN);
+}
+
+/*
+ * Program data lines of the nand chip to send data to it
+ */
+void r822_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ u32 reg;
+
+ if (dev->card_unstable)
+ return;
+
+ /* special case for whole sector read */
+ if (len == R822_DMA_LEN && dev->dma_usable) {
+ r822_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;
+ r822_write_reg_dword(dev, R822_DATALINE, reg);
+ buf += 4;
+ len -= 4;
+
+ }
+
+ /* write rest */
+ while (len)
+ r822_write_reg(dev, R822_DATALINE, *buf++);
+}
+
+/*
+ * Read data lines of the nand chip to retrieve data
+ */
+void r822_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ u32 reg;
+
+ if (dev->card_unstable)
+ return;
+
+ /* special case for whole sector read */
+ if (len == R822_DMA_LEN && dev->dma_usable) {
+ r822_do_dma(dev, buf, 1);
+ return;
+ }
+
+ /* read in dword sized chunks */
+ while (len >= 4) {
+
+ reg = r822_read_reg_dword(dev, R822_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++ = r822_read_reg(dev, R822_DATALINE);
+}
+
+static uint8_t r822_read_byte(struct mtd_info *mtd)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ return r822_read_reg(dev, R822_DATALINE);
+}
+
+
+/*
+ * Readback the buffer to verify it
+ */
+int r822_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return 0;
+
+ if (len > SM_SECTOR_SIZE)
+ return 0;
+
+ r822_read_buf(mtd, dev->tmp_buffer, len);
+ return memcmp(buf, dev->tmp_buffer, len);
+}
+
+/*
+ * Control several chip lines & send commands
+ */
+void r822_cmdctl(struct mtd_info *mtd, int dat, unsigned int ctrl)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+
+ dev->ctlreg &= ~(R822_CTL_DATA | R822_CTL_COMMAND |
+ R822_CTL_ON | R822_CTL_CARDENABLE);
+
+ if (ctrl & NAND_ALE)
+ dev->ctlreg |= R822_CTL_DATA;
+
+ if (ctrl & NAND_CLE)
+ dev->ctlreg |= R822_CTL_COMMAND;
+
+ if (ctrl & NAND_NCE)
+ dev->ctlreg |= (R822_CTL_CARDENABLE | R822_CTL_ON);
+ else
+ dev->ctlreg &= ~R822_CTL_WRITE;
+
+ /* when write is stareted, enable write access */
+ if (dat == NAND_CMD_ERASE1)
+ dev->ctlreg |= R822_CTL_WRITE;
+
+ r822_write_reg(dev, R822_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 & R822_CTL_COMMAND)) {
+ dev->ctlreg |= R822_CTL_WRITE;
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ }
+
+ if (dat != NAND_CMD_NONE)
+ r822_write_reg(dev, R822_DATALINE, dat);
+}
+
+/*
+ * Wait till card is ready... This has to be a busy loop because
+ * 'our <censored> controller' doesn't have an interrupt for that...
+ * based on nand_wait
+ */
+int r822_wait(struct mtd_info *mtd, struct nand_chip *chip)
+{
+ struct r822_device *dev = (struct r822_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 r822_ready(struct mtd_info *mtd)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ return !(r822_read_reg(dev, R822_CARD_STA) & R822_CARD_STA_BUSY);
+}
+
+
+/*
+ * Set ECC engine mode
+*/
+
+void r822_ecc_hwctl(struct mtd_info *mtd, int mode)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return;
+
+ switch (mode) {
+ case NAND_ECC_READ:
+ case NAND_ECC_WRITE:
+ /* enable ecc generation/check*/
+ dev->ctlreg |= R822_CTL_ECC_ENABLE;
+
+ /* flush ecc buffer */
+ r822_write_reg(dev, R822_CTL,
+ dev->ctlreg | R822_CTL_ECC_ACCESS);
+
+ r822_read_reg(dev, R822_DATALINE);
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ return;
+
+ case NAND_ECC_READSYN:
+ /* disable ecc generation */
+ dev->ctlreg &= ~R822_CTL_ECC_ENABLE;
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ }
+}
+
+/*
+ * Calculate ECC, only used for writes
+ */
+
+int r822_ecc_calculate(struct mtd_info *mtd, const uint8_t *dat,
+ uint8_t *ecc_code)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ struct sm_oob *oob = (struct sm_oob *)ecc_code;
+ u32 ecc1, ecc2;
+
+ if (dev->card_unstable)
+ return 0;
+
+ dev->ctlreg &= ~R822_CTL_ECC_ENABLE;
+ r822_write_reg(dev, R822_CTL, dev->ctlreg | R822_CTL_ECC_ACCESS);
+
+ ecc1 = r822_read_reg_dword(dev, R822_DATALINE);
+ ecc2 = r822_read_reg_dword(dev, R822_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;
+
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ return 0;
+}
+
+/*
+ * Correct the data using ECC, hw did almost everything for us
+ */
+
+int r822_ecc_correct(struct mtd_info *mtd, uint8_t *dat,
+ uint8_t *read_ecc, uint8_t *calc_ecc)
+{
+ u16 ecc_reg;
+ u8 ecc_status, err_byte;
+ int i, error = 0;
+
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return 0;
+
+ r822_write_reg(dev, R822_CTL, dev->ctlreg | R822_CTL_ECC_ACCESS);
+ ecc_reg = r822_read_reg_dword(dev, R822_DATALINE);
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+
+ for (i = 0 ; i <= 1 ; i++) {
+
+ ecc_status = (ecc_reg >> 8) & 0xFF;
+
+ /* ecc uncorrectable error */
+ if (ecc_status & R822_ECC_FAIL) {
+ dbg("ecc: unrecoverable error, in half %d", i);
+ error = -1;
+ goto exit;
+ }
+
+ /* correctable error */
+ if (ecc_status & R822_ECC_CORRECTABLE) {
+
+ err_byte = ecc_reg & 0xFF;
+
+ dbg("ecc: recoverable error, "
+ "in half %d, byte %d, bit %d", i,
+ err_byte, ecc_status & R822_ECC_ERR_BIT_MSK);
+
+ dat[err_byte] ^=
+ 1 << (ecc_status & R822_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 r822_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 hardware
+ */
+
+void r822_device_start(struct r822_device *dev)
+{
+ if (r822_read_reg(dev, R822_HW) & R822_HW_UNKNOWN) {
+ dbg("r822_device_start: probably recovering from HW error");
+ r822_write_reg(dev, R822_CTL, R822_CTL_RESET | R822_CTL_ON);
+ r822_write_reg_dword(dev, R822_HW, R822_HW_ENABLED);
+ } else {
+ r822_write_reg(dev, R822_HW, R822_HW_ENABLED);
+ r822_write_reg(dev, R822_CTL, R822_CTL_RESET | R822_CTL_ON);
+ r822_write_reg(dev, R822_CTL, 0);
+ }
+ msleep(200);
+}
+
+
+/*
+ * Shutdown the hardware
+ */
+
+void r822_device_shutdown(struct r822_device *dev)
+{
+ r822_write_reg(dev, R822_HW, 0);
+ r822_write_reg(dev, R822_CTL, R822_CTL_RESET);
+}
+
+/*
+ * Test if card is present
+ */
+
+void r822_card_update_present(struct r822_device *dev)
+{
+ unsigned long flags;
+ u8 reg;
+
+ spin_lock_irqsave(&dev->irqlock, flags);
+ reg = r822_read_reg(dev, R822_CARD_STA);
+ dev->card_detected = !!(reg & R822_CARD_STA_PRESENT);
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+}
+
+/*
+ * Update card detection IRQ state according to current card state
+ * which is read in r822_card_update_present
+ */
+void r822_update_card_detect(struct r822_device *dev)
+{
+ int card_detect_reg = R822_CARD_IRQ_GENABLE;
+ card_detect_reg |= dev->card_detected ?
+ R822_CARD_IRQ_REMOVE : R822_CARD_IRQ_INSERT;
+
+ r822_write_reg(dev, R822_CARD_IRQ_ENABLE, card_detect_reg);
+}
+
+
+/* Detect properties of card in slot */
+void r822_update_media_status(struct r822_device *dev)
+{
+ u8 reg;
+ unsigned long flags;
+ int readonly, sm;
+
+ spin_lock_irqsave(&dev->irqlock, flags);
+ if (!dev->card_detected) {
+ dbg("card removed");
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return ;
+ }
+
+ readonly = r822_read_reg(dev, R822_CARD_STA) & R822_CARD_STA_RO;
+ reg = r822_read_reg(dev, R822_DMA_CAP);
+ sm = (reg & (R822_DMA1 | R822_DMA2)) && (reg & R822_SMBIT);
+
+ dbg("detected %s %s card in slot",
+ 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 r822_register_nand_device(struct r822_device *dev)
+{
+ dev->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
+
+ if (!dev->mtd)
+ goto error1;
+
+ dev->mtd->owner = THIS_MODULE;
+ dev->mtd->priv = dev->chip;
+
+ if (dev->readonly)
+ dev->chip->options |= NAND_ROM;
+
+ r822_device_start(dev);
+ if (sm_register_device(dev->mtd))
+ goto error2;
+
+ dev->card_registred = 1;
+ return 0;
+error2:
+ kfree(dev->mtd);
+error1:
+ return -1;
+}
+
+/*
+ * Unregister the card
+ */
+
+void r822_unregister_nand_device(struct r822_device *dev)
+{
+ if (!dev->card_registred)
+ return;
+
+ nand_release(dev->mtd);
+ r822_device_shutdown(dev);
+ dev->card_registred = 0;
+ kfree(dev->mtd);
+ dev->mtd = NULL;
+}
+
+
+/* Card state updater */
+void r822_card_detect_work(struct work_struct *work)
+{
+ struct r822_device *dev =
+ container_of(work, struct r822_device, card_detect_work.work);
+
+ r822_card_update_present(dev);
+ dev->card_unstable = 0;
+
+ /* false alarm */
+ if (dev->card_detected == dev->card_registred)
+ goto exit;
+
+ r822_update_media_status(dev);
+
+ /* no card present */
+ if (!dev->card_detected) {
+ r822_unregister_nand_device(dev);
+ goto exit;
+ }
+
+ /* card present from now */
+
+
+ if (!r822_register_nand_device(dev))
+ goto exit;
+ else
+ dev->card_detected = 0;
+exit:
+ r822_update_card_detect(dev);
+}
+
+
+/* disable IRQ generation */
+static void r822_disable_irqs(struct r822_device *dev)
+{
+ u8 reg;
+ reg = r822_read_reg(dev, R822_CARD_IRQ_ENABLE);
+ r822_write_reg(dev, R822_CARD_IRQ_ENABLE, reg & ~R822_CARD_IRQ_MASK);
+
+ reg = r822_read_reg(dev, R822_DMA_IRQ_ENABLE);
+ r822_write_reg(dev, R822_DMA_IRQ_ENABLE, reg & ~R822_DMA_IRQ_MASK);
+
+ reg = r822_read_reg(dev, R822_CARD_IRQ_STA);
+ r822_write_reg(dev, R822_CARD_IRQ_STA, reg);
+
+ reg = r822_read_reg(dev, R822_DMA_IRQ_STA);
+ r822_write_reg(dev, R822_DMA_IRQ_STA, reg);
+
+}
+
+/* Interrupt handler */
+static irqreturn_t r822_irq(int irq, void *data)
+{
+ struct r822_device *dev = (struct r822_device *)data;
+
+ u8 card_status, dma_status;
+ unsigned long flags;
+
+ 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) {
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_NONE;
+ }
+
+ /* Test card status interrupt status */
+ card_status =
+ r822_read_reg(dev, R822_CARD_IRQ_STA) & R822_CARD_IRQ_MASK;
+
+ if (card_status & (R822_CARD_IRQ_INSERT|R822_CARD_IRQ_REMOVE)) {
+
+ dev->card_detected = !!(card_status & R822_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 */
+ r822_disable_irqs(dev);
+
+ /* let, card state to settle a bit, and then do the work */
+ if (!dev->card_unstable) {
+ dev->card_unstable = 1;
+ queue_delayed_work(dev->card_workqueue,
+ &dev->card_detect_work, msecs_to_jiffies(100));
+ }
+
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+ }
+
+
+ /* test and ack dma interrupts */
+ dma_status = r822_read_reg(dev, R822_DMA_IRQ_STA) & R822_DMA_IRQ_MASK;
+ r822_write_reg(dev, R822_DMA_IRQ_STA, dma_status);
+
+ if (!dma_status) {
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_NONE;
+ }
+
+ if (dma_status & R822_DMA_IRQ_ERROR) {
+ dbg("recieved dma error IRQ");
+ r822_dma_done(dev, -EIO);
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+ }
+
+
+ /* recieved DMA interrupt out of nowhere? */
+ WARN_ON_ONCE(dev->dma_stage == 0);
+
+ if (dev->dma_stage == 0) {
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+ }
+
+ /* done device access */
+ if (dev->dma_state == DMA_INTERNAL &&
+ (dma_status & R822_DMA_IRQ_INTERNAL)) {
+
+ dev->dma_state = DMA_MEMORY;
+ dev->dma_stage++;
+ }
+
+ /* done memory DMA */
+ if (dev->dma_state == DMA_MEMORY &&
+ (dma_status & R822_DMA_IRQ_MEMORY)) {
+ dev->dma_state = DMA_INTERNAL;
+ dev->dma_stage++;
+ }
+
+ /* Enable 2nd half of dma dance */
+ if (dev->dma_stage == 2)
+ r822_dma_enable(dev);
+
+
+ /* Operation done */
+ if (dev->dma_stage == 3)
+ r822_dma_done(dev, 0);
+
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+}
+
+int r822_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
+{
+ int error;
+ struct nand_chip *chip;
+ struct r822_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_32BIT_MASK);
+ 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 = r822_cmdctl;
+ chip->waitfunc = r822_wait;
+ chip->dev_ready = r822_ready;
+
+ /* I/O */
+ chip->read_byte = r822_read_byte;
+ chip->read_buf = r822_read_buf;
+ chip->write_buf = r822_write_buf;
+ chip->verify_buf = r822_verify_buf;
+
+ /* ecc */
+ chip->ecc.mode = NAND_ECC_HW_SYNDROME;
+ chip->ecc.size = R822_DMA_LEN;
+ chip->ecc.bytes = SM_OOB_SIZE;
+ chip->ecc.hwctl = r822_ecc_hwctl;
+ chip->ecc.calculate = r822_ecc_calculate;
+ chip->ecc.correct = r822_ecc_correct;
+
+ /* TODO: hack */
+ chip->ecc.read_oob = r822_read_oob;
+
+ /* init our device structure */
+ dev = kzalloc(sizeof(struct r822_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, R822_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, r822_card_detect_work);
+
+ /* shutdown everything - precation */
+ r822_device_shutdown(dev);
+ r822_disable_irqs(dev);
+ r822_dma_test(dev);
+
+ /*register irq handler*/
+ error = -ENODEV;
+ if (request_irq(pci_dev->irq, &r822_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;
+ r822_card_update_present(dev);
+ queue_delayed_work(dev->card_workqueue,
+ &dev->card_detect_work, 0);
+
+ /* Load the FTL */
+ request_module_nowait("sm_ftl");
+
+ 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, R822_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 r822_remove(struct pci_dev *pci_dev)
+{
+ struct r822_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 */
+ r822_unregister_nand_device(dev);
+
+ /* Stop interrupts */
+ r822_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, R822_DMA_LEN,
+ dev->bounce_buffer, dev->phys_bounce_buffer);
+ kfree(dev);
+ kfree(dev->chip);
+
+ /* Shutdown the PCI device */
+ pci_release_regions(pci_dev);
+ pci_disable_device(pci_dev);
+}
+
+void r822_shutdown(struct pci_dev *pci_dev)
+{
+ struct r822_device *dev = pci_get_drvdata(pci_dev);
+
+ cancel_delayed_work_sync(&dev->card_detect_work);
+ r822_disable_irqs(dev);
+ synchronize_irq(dev->irq);
+ pci_disable_device(pci_dev);
+}
+
+int r822_suspend(struct device *device)
+{
+ struct r822_device *dev = pci_get_drvdata(to_pci_dev(device));
+ unsigned long flags;
+
+ if (dev->ctlreg & R822_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 */
+ r822_disable_irqs(dev);
+ r822_device_shutdown(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));
+ pci_set_power_state(to_pci_dev(device), PCI_D3cold);
+
+
+ return 0;
+}
+
+int r822_resume(struct device *device)
+{
+ struct r822_device *dev = pci_get_drvdata(to_pci_dev(device));
+ unsigned long flags;
+
+ /* Turn on the hardware */
+ pci_set_power_state(to_pci_dev(device), PCI_D0);
+ pci_restore_state(to_pci_dev(device));
+
+ /* Disable everything - precation */
+ r822_disable_irqs(dev);
+ r822_device_shutdown(dev);
+
+ /* Detect the card change */
+ r822_card_update_present(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, 0);
+ return 0;
+ }
+
+ /* Otherwise, initialize the card */
+ if (dev->card_registred) {
+ r822_device_start(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);
+ }
+
+ /* Now its safe for IRQ to run */
+ spin_lock_irqsave(&dev->irqlock, flags);
+ dev->insuspend = 0;
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+
+ /* Program card detection IRQ */
+ r822_update_card_detect(dev);
+
+ return 0;
+}
+
+static const struct pci_device_id r822_pci_id_tbl[] = {
+
+ { PCI_VDEVICE(RICOH, PCI_DEVICE_ID_RICOH_R5C852), },
+ { },
+};
+
+MODULE_DEVICE_TABLE(pci, r822_pci_id_tbl);
+
+SIMPLE_DEV_PM_OPS(r822_pm_ops, r822_suspend, r822_resume);
+
+
+static struct pci_driver r822_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = r822_pci_id_tbl,
+ .probe = r822_probe,
+ .remove = r822_remove,
+ .shutdown = r822_shutdown,
+ .driver.pm = &r822_pm_ops,
+};
+
+static __init int r822_module_init(void)
+{
+ return pci_register_driver(&r822_pci_driver);
+}
+
+static void __exit r822_module_exit(void)
+{
+ pci_unregister_driver(&r822_pci_driver);
+}
+
+module_init(r822_module_init);
+module_exit(r822_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
+MODULE_DESCRIPTION("Ricoh 85xx xD/smartmedia card reader driver");
diff --git a/drivers/mtd/nand/r822.h b/drivers/mtd/nand/r822.h
new file mode 100644
index 0000000..87e51f8
--- /dev/null
+++ b/drivers/mtd/nand/r822.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 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/pci.h>
+#include <linux/completion.h>
+#include <linux/workqueue.h>
+#include <linux/mtd/nand.h>
+#include <linux/spinlock.h>
+
+
+/* nand interface + ecc
+ byte write/read does one cycle on nand data lines.
+ dword write/read does 4 cycles
+ if R822_CTL_ECC_ACCESS is set in R822_CTL, then dword read reads
+ results of ecc correction, if DMA read was done before.
+ If write was done two dword reads read generated ecc checksums
+*/
+#define R822_DATALINE 0x00
+
+/* control register */
+#define R822_CTL 0x04
+#define R822_CTL_COMMAND 0x01 /* send command (#CLE)*/
+#define R822_CTL_DATA 0x02 /* read/write data (#ALE)*/
+#define R822_CTL_ON 0x04 /* only seem to controls the hd led, */
+ /* but has to be set on start...*/
+#define R822_CTL_RESET 0x08 /* unknown, set only on start once*/
+#define R822_CTL_CARDENABLE 0x10 /* probably (#CE) - always set*/
+#define R822_CTL_ECC_ENABLE 0x20 /* enable ecc engine */
+#define R822_CTL_ECC_ACCESS 0x40 /* read/write ecc via reg #0*/
+#define R822_CTL_WRITE 0x80 /* set when performing writes (#WP) */
+
+
+/* card detection status */
+#define R822_CARD_STA 0x05
+#define R822_CARD_STA_UNUSED1 0x01 /* unknown */
+#define R822_CARD_STA_RO 0x02 /* card is readonly -- test on #WP???*/
+#define R822_CARD_STA_PRESENT 0x04 /* card is present (#CD) */
+#define R822_CARD_STA_BUSY 0x80 /* card is busy - (#R/B) */
+
+/* card detection irq status*/
+#define R822_CARD_IRQ_STA 0x06 /* IRQ status */
+
+/* card detection irq enable */
+#define R822_CARD_IRQ_ENABLE 0x07 /* IRQ enable */
+
+#define R822_CARD_IRQ_UNUSED1 0x01 /* unknown */
+#define R822_CARD_IRQ_REMOVE 0x04 /* detect card removal */
+#define R822_CARD_IRQ_INSERT 0x08 /* detect card insert */
+#define R822_CARD_IRQ_UNUSED2 0x10 /* unknown */
+#define R822_CARD_IRQ_GENABLE 0x80 /* general enable */
+#define R822_CARD_IRQ_MASK 0x1D
+
+
+/* hardware enable */
+#define R822_HW 0x08
+#define R822_HW_ENABLED 0x01 /* hw enabled */
+#define R822_HW_UNKNOWN 0x80
+
+
+/* dma capabilities */
+#define R822_DMA_CAP 0x09
+#define R822_SMBIT 0x20 /* if set with bit #6 or bit #7, then */
+ /* hw is smartmedia */
+#define R822_DMA1 0x40 /* if set w/bit #7, dma is supported */
+#define R822_DMA2 0x80 /* if set w/bit #6, dma is supported */
+
+
+/* physical DMA address - 32 bit value*/
+#define R822_DMA_ADDR 0x0C
+
+
+/* dma settings */
+#define R822_DMA_SETTINGS 0x10
+#define R822_DMA_MEMORY 0x01 /* (memory <-> internal hw buffer) */
+#define R822_DMA_READ 0x02 /* 0 = write, 1 = read */
+#define R822_DMA_INTERNAL 0x04 /* (internal hw buffer <-> card) */
+
+/* dma IRQ status */
+#define R822_DMA_IRQ_STA 0x14
+
+/* dma IRQ enable */
+#define R822_DMA_IRQ_ENABLE 0x18
+
+#define R822_DMA_IRQ_MEMORY 0x01 /* (memory <-> internal hw buffer) */
+#define R822_DMA_IRQ_ERROR 0x02 /* error did happen */
+#define R822_DMA_IRQ_INTERNAL 0x04 /* (internal hw buffer <-> card) */
+#define R822_DMA_IRQ_MASK 0x07 /* mask of all IRQ bits */
+
+
+/* ECC syndrome format - read from reg #0 will return two copies of these for
+ each half of the page.
+ first byte is error byte location, and second, bit location + flags */
+#define R822_ECC_ERR_BIT_MSK 0x07 /* error bit location */
+#define R822_ECC_CORRECT 0x10 /* no errors - (guessed) */
+#define R822_ECC_CORRECTABLE 0x20 /* correctable error exist */
+#define R822_ECC_FAIL 0x40 /* non correctable error detected */
+
+#define R822_DMA_LEN 512
+
+#define DMA_INTERNAL 0
+#define DMA_MEMORY 1
+
+struct r822_device {
+ void __iomem *mmio; /* mmio */
+ struct mtd_info *mtd; /* mtd backpointer */
+ struct nand_chip *chip; /* nand chip backpointer */
+ struct pci_dev *pci_dev; /* pci backpointer */
+
+ /* dma area */
+ dma_addr_t phys_dma_addr; /* bus address of buffer*/
+ struct completion dma_done; /* data transfer done */
+
+ dma_addr_t phys_bounce_buffer; /* bus address of bounce buffer */
+ u8 *bounce_buffer; /* virtual address of bounce buffer */
+
+ int dma_dir; /* 1 = read, 0 = write */
+ int dma_stage; /* 0 - idle, 1 - first step,
+ 2 - second step */
+
+ int dma_state; /* 0 = internal, 1 = memory */
+ int dma_error; /* dma errors */
+ int dma_usable; /* is it possible to use dma */
+
+ /* card status area */
+ struct delayed_work card_detect_work;
+ struct workqueue_struct *card_workqueue;
+ int card_registred; /* card registered with mtd */
+ int card_detected; /* card detected in slot */
+ int card_unstable; /* whenever the card is inserted,
+ is not known yet */
+ int readonly; /* card is readonly */
+
+ /* interrupt handling */
+ spinlock_t irqlock; /* IRQ protecting lock */
+ int irq; /* irq num */
+ int insuspend; /* device is suspended */
+
+ /* misc */
+ void *tmp_buffer; /* temporary buffer */
+ u8 ctlreg; /* cached contents of control reg */
+};
+
+#define DRV_NAME "r822"
+
+#define dbg(format, ...) \
+ printk(KERN_ERR DRV_NAME ": " format "\n", ## __VA_ARGS__)
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index cca8a04..cef49f2 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -1523,6 +1523,8 @@
#define PCI_DEVICE_ID_RICOH_R5C822 0x0822
#define PCI_DEVICE_ID_RICOH_R5C832 0x0832
#define PCI_DEVICE_ID_RICOH_R5C843 0x0843
+#define PCI_DEVICE_ID_RICOH_R5C852 0x0852
+
#define PCI_VENDOR_ID_DLINK 0x1186
#define PCI_DEVICE_ID_DLINK_DGE510T 0x4c00
--
1.6.3.3
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH 2/2] MTD: Add new SmartMedia/xD FTL
2010-01-22 16:12 [PATCH 0/2] Smartmedia/xD support Maxim Levitsky
2010-01-22 16:14 ` [PATCH 1/2] MTD: Add nand driver for ricoh xD/SmartMedia reader Maxim Levitsky
@ 2010-01-22 16:15 ` Maxim Levitsky
1 sibling, 0 replies; 3+ messages in thread
From: Maxim Levitsky @ 2010-01-22 16:15 UTC (permalink / raw)
To: David Woodhouse
Cc: Thomas Gleixner, joern, linux-mtd, linux-kernel, Alex Dubov
>From 07a6c30621ed3dfe84034a75f928bd8ddfd11a64 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Fri, 22 Jan 2010 16:42:12 +0200
Subject: [PATCH 2/2] MTD: Add new SmartMedia/xD FTL
This implements new readwrite SmartMedia/xd FTL.
mtd driver must have support proper ECC
based on oob parts for 512 bytes nand.
Also mtd driver must define read_oob and write_oob, which are used
to read and write both data and oob together.
Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
drivers/mtd/Kconfig | 20 +
drivers/mtd/Makefile | 1 +
drivers/mtd/sm_ftl.c | 1181 ++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/mtd/sm_ftl.h | 92 ++++
4 files changed, 1294 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/sm_ftl.c
create mode 100644 drivers/mtd/sm_ftl.h
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index ecf90f5..ec6c376 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -304,6 +304,26 @@ config SSFDC
This enables read only access to SmartMedia formatted NAND
flash. You can mount it with FAT file system.
+
+config SM_FTL
+ tristate "SmartMedia/xD new translation layer"
+ depends on EXPERIMENTAL
+ help
+ This enables new and very EXPERMENTAL support for SmartMedia/xD
+ FTL (Flash tanslation layer)
+ Write support isn't yet well tested, therefore this code IS likely to
+ eat your card, so please don't use it together with valuable data.
+ Use readonly driver (CONFIG_SSFDC) instead.
+
+config SM_FTL_MUSEUM
+ boolean "Additional Support for 1MB and 2MB SmartMedia cards"
+ depends on SM_FTL && MTD_NAND
+ select MTD_NAND_ECC_SMC
+ help
+ Very old SmartMedia cards need ECC to be caluculated in the FTL
+ Such cards are very rare, thus enabling this option is mostly useless
+ Also this support is completely UNTESTED.
+
config MTD_OOPS
tristate "Log panic/oops to an MTD buffer"
depends on MTD
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 82d1e4d..d53357b 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_NFTL) += nftl.o
obj-$(CONFIG_INFTL) += inftl.o
obj-$(CONFIG_RFD_FTL) += rfd_ftl.o
obj-$(CONFIG_SSFDC) += ssfdc.o
+obj-$(CONFIG_SM_FTL) += sm_ftl.o
obj-$(CONFIG_MTD_OOPS) += mtdoops.o
nftl-objs := nftlcore.o nftlmount.o
diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
new file mode 100644
index 0000000..0f43907
--- /dev/null
+++ b/drivers/mtd/sm_ftl.c
@@ -0,0 +1,1181 @@
+/*
+ * Copyright (C) 2009 - Maxim Levitsky
+ * SmartMedia/xD translation layer
+ *
+ * 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/random.h>
+#include <linux/hdreg.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/bitops.h>
+#include "nand/sm_common.h"
+#include "sm_ftl.h"
+
+#ifdef CONFIG_SM_FTL_MUSEUM
+#include <linux/mtd/nand_ecc.h>
+#endif
+
+
+struct workqueue_struct *cache_flush_workqueue;
+
+static int cache_timeout = 1000;
+module_param(cache_timeout, bool, S_IRUGO);
+MODULE_PARM_DESC(cache_timeout, "Timeout in ms for cache flush (1000 default");
+
+static const struct chs_entry chs_table[] = {
+ { 1, 125, 4, 4 },
+ { 2, 125, 4, 8 },
+ { 4, 250, 4, 8 },
+ { 8, 250, 4, 16 },
+ { 16, 500, 4, 16 },
+ { 32, 500, 8, 16 },
+ { 64, 500, 8, 32 },
+ { 128, 500, 16, 32 },
+ { 256, 1000, 16, 32 },
+ { 512, 1015, 32, 63 },
+ { 1024, 985, 33, 63 },
+ { 2048, 985, 33, 63 },
+ { 0 },
+};
+
+static const u8 cis_signature[] = {
+ 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
+};
+
+
+/* ----------------------- oob helpers -------------------------------------- */
+
+static int sm_get_lba(u8 *lba)
+{
+ /* check fixed bits */
+ if ((lba[0] & 0xF8) != 0x10)
+ return -2;
+
+ /* check parity - endianess doesn't matter */
+ if (hweight16(*(u16 *)lba) & 1)
+ return -2;
+
+ return (lba[1] >> 1) | ((lba[0] & 0x07) << 7);
+}
+
+
+/*
+ * Read LBA asscociated with block
+ * returns -1, if block is erased
+ * returns -2 if error happens
+ */
+static int sm_read_lba(struct sm_oob *oob)
+{
+ static const u32 erased_pattern[4] = {
+ 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
+
+ u16 lba_test;
+ int lba;
+
+ /* First test for erased block */
+ if (!memcmp(oob, erased_pattern, SM_OOB_SIZE))
+ return -1;
+
+ /* Now check is both copies of the LBA differ too much */
+ lba_test = *(u16 *)oob->lba_copy1 ^ *(u16*)oob->lba_copy2;
+ if (lba_test && !is_power_of_2(lba_test))
+ return -2;
+
+ /* And read it */
+ lba = sm_get_lba(oob->lba_copy1);
+
+ if (lba == -2)
+ lba = sm_get_lba(oob->lba_copy2);
+
+ return lba;
+}
+
+static void sm_write_lba(struct sm_oob *oob, u16 lba)
+{
+ u8 tmp[2];
+
+ WARN_ON(lba > 1000);
+
+ tmp[0] = 0x10 | ((lba >> 7) & 0x07);
+ tmp[1] = (lba << 1) & 0xFF;
+
+ if (hweight16(*(u16 *)tmp) & 0x01)
+ tmp[1] |= 1;
+
+ oob->lba_copy1[0] = oob->lba_copy2[0] = tmp[0];
+ oob->lba_copy1[1] = oob->lba_copy2[1] = tmp[1];
+}
+
+
+/* Make offset from parts */
+static loff_t sm_mkoffset(struct sm_ftl *ftl, int zone, int block, int boffset)
+{
+ WARN_ON(boffset & (SM_SECTOR_SIZE - 1));
+ WARN_ON(zone < 0 || zone >= ftl->zone_count);
+ WARN_ON(block >= ftl->zone_size);
+ WARN_ON(boffset > ftl->block_size);
+
+ if (block == -1)
+ return -1;
+
+ return (zone * SM_MAX_ZONE_SIZE + block) * ftl->block_size + boffset;
+}
+
+/* Breaks offset into parts */
+static void sm_break_offset(struct sm_ftl *ftl, loff_t offset,
+ int *zone, int *block, int *boffset)
+{
+ *boffset = offset % ftl->block_size;
+ offset /= ftl->block_size;
+ *block = offset % ftl->max_lba;
+ offset /= ftl->max_lba;
+ *zone = offset >= ftl->zone_count ? -1 : offset;
+}
+
+/* ---------------------- low level IO ------------------------------------- */
+
+static int sm_correct_sector(u8 *buffer, struct sm_oob *oob)
+{
+#ifdef CONFIG_SM_FTL_MUSEUM
+ u8 ecc[3];
+
+ __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc);
+
+ if (__nand_correct_data(buffer, ecc, oob->ecc1, SM_SMALL_PAGE) < 0)
+ return -EIO;
+
+ __nand_calculate_ecc(buffer + SM_SMALL_PAGE, SM_SMALL_PAGE, ecc);
+
+ if (__nand_correct_data(buffer, ecc, oob->ecc2, SM_SMALL_PAGE) < 0)
+ return -EIO;
+#endif
+ return 0;
+}
+
+/* Reads a sector + oob*/
+static int sm_read_sector(struct sm_ftl *ftl,
+ int zone, int block, int boffset,
+ u8 *buffer, struct sm_oob *oob)
+{
+ struct mtd_info *mtd = ftl->trans->mtd;
+ struct mtd_oob_ops ops;
+ struct sm_oob tmp_oob;
+ int ret;
+ int try = 0;
+
+ /* FTL can contain -1 entries that are by default filled with bits */
+ if (block == -1) {
+ memset(buffer, 0xFF, SM_SECTOR_SIZE);
+ return 0;
+ }
+
+ /* User might not need the oob, but we do for data vertification */
+ if (!oob)
+ oob = &tmp_oob;
+
+ ops.mode = ftl->smallpagenand ? MTD_OOB_RAW : MTD_OOB_PLACE;
+ ops.ooboffs = 0;
+ ops.ooblen = SM_OOB_SIZE;
+ ops.oobbuf = (void *)oob;
+ ops.len = SM_SECTOR_SIZE;
+ ops.datbuf = buffer;
+
+again:
+ /* Retrial mode */
+ if (try++) {
+ /* Avoid infinite recursion on CIS reads, sm_recheck_media
+ won't help anyway */
+ if (zone == 0 && block == ftl->cis_block && boffset ==
+ ftl->cis_boffset)
+ return ret;
+
+ /* Test if media is stable */
+ if (try == 3 || sm_recheck_media(ftl))
+ return ret;
+ }
+
+ ret = mtd->read_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops);
+
+ /* Test for unknown errors */
+ if (ret != 0 && ret != -EUCLEAN && ret != -EBADMSG) {
+ dbg("read of block %d at zone %d, failed due to error (%d)",
+ block, zone, ret);
+ goto again;
+ }
+
+ /* This should never happen, unless there is a bug in the mtd driver */
+ WARN_ON(ops.oobretlen != SM_OOB_SIZE);
+ WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE);
+
+ if (!buffer)
+ return 0;
+
+
+ /* Test if sector marked as bad */
+ if (!sm_sector_valid(oob)) {
+ dbg("read of block %d at zone %d, failed because it is marked"
+ " as bad" , block, zone);
+ goto again;
+ }
+
+ /* Test ECC*/
+ if (ret == -EBADMSG ||
+ (ftl->smallpagenand && sm_correct_sector(buffer, oob))) {
+
+ dbg("read of block %d at zone %d, failed due to ECC error",
+ block, zone);
+ goto again;
+ }
+
+ return 0;
+}
+
+/* Writes a sector to media */
+static int sm_write_sector(struct sm_ftl *ftl,
+ int zone, int block, int boffset,
+ u8 *buffer, struct sm_oob *oob)
+{
+ struct mtd_oob_ops ops;
+ struct mtd_info *mtd = ftl->trans->mtd;
+ int ret;
+
+ BUG_ON(ftl->readonly);
+
+ if (zone == 0 && (block == ftl->cis_block || block == 0)) {
+ dbg("attempted to write the CIS!");
+ return -EIO;
+ }
+
+ if (ftl->unstable)
+ return -EIO;
+
+ ops.mode = ftl->smallpagenand ? MTD_OOB_RAW : MTD_OOB_PLACE;
+ ops.len = SM_SECTOR_SIZE;
+ ops.datbuf = buffer;
+ ops.ooboffs = 0;
+ ops.ooblen = SM_OOB_SIZE;
+ ops.oobbuf = (void *)oob;
+
+ ret = mtd->write_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops);
+
+ /* Now we assume that hardware will catch write bitflip errors */
+ /* If you are paranoid, use CONFIG_MTD_NAND_VERIFY_WRITE */
+
+ if (ret) {
+ dbg("write to block %d at zone %d, failed with error %d",
+ block, zone, ret);
+
+ sm_recheck_media(ftl);
+ return ret;
+ }
+
+ /* This should never happen, unless there is a bug in the driver */
+ WARN_ON(ops.oobretlen != SM_OOB_SIZE);
+ WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE);
+
+ return 0;
+}
+
+/* ------------------------ block IO ------------------------------------- */
+
+/* Write a block using data and lba, and valid sector bitmap */
+static int sm_write_block(struct sm_ftl *ftl, u8 *buf,
+ int zone_num, int block, int lba,
+ unsigned long invalid_bitmap)
+{
+ struct sm_oob oob;
+ int boffset;
+ int retry = 0;
+
+ /* Initialize the oob with requested values */
+ memset(&oob, 0xFF, SM_OOB_SIZE);
+ sm_write_lba(&oob, lba);
+
+restart:
+ for (boffset = 0; boffset < ftl->block_size;
+ boffset += SM_SECTOR_SIZE) {
+
+ oob.data_status = 0xFF;
+
+ if (test_bit(boffset / SM_SECTOR_SIZE, &invalid_bitmap)) {
+
+ sm_printk("sector %d of block at LBA %d of zone %d"
+ " coudn't be read, marking it as invalid",
+ boffset / SM_SECTOR_SIZE, lba, zone_num);
+
+ oob.data_status = 0;
+ }
+
+#ifdef CONFIG_SM_FTL_MUSEUM
+ if (ftl->smallpagenand) {
+ __nand_calculate_ecc(buf + boffset,
+ SM_SMALL_PAGE, oob.ecc1);
+
+ __nand_calculate_ecc(buf + boffset + SM_SMALL_PAGE,
+ SM_SMALL_PAGE, oob.ecc2);
+ }
+#endif
+ if (!sm_write_sector(ftl, zone_num, block, boffset,
+ buf + boffset, &oob))
+ continue;
+
+ if (!retry) {
+
+ /* If write fails. try to erase the block */
+ /* This is safe, because we never write in blocks
+ that contain valuable data.
+ This is intended to repair block that are marked
+ as erased, but that isn't fully erased*/
+
+ if (sm_erase_block(ftl, zone_num, block, 0))
+ return -EIO;
+
+ retry = 1;
+ goto restart;
+ } else {
+ sm_mark_block_bad(ftl, zone_num, block);
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+
+/* Mark whole block at offset 'offs' as bad. */
+static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block)
+{
+ struct sm_oob oob;
+ int boffset;
+
+ memset(&oob, 0xFF, SM_OOB_SIZE);
+ oob.block_status = 0xF0;
+
+ if (ftl->unstable)
+ return;
+
+ if (sm_recheck_media(ftl))
+ return;
+
+ sm_printk("marking block %d of zone %d as bad", block, zone_num);
+
+ /* We aren't checking the return value, because we don't care */
+ /* This also fails on fake xD cards, but I guess these won't expose
+ any bad blocks till fail completly */
+ for (boffset = 0; boffset < ftl->block_size; boffset += SM_SECTOR_SIZE)
+ sm_write_sector(ftl, zone_num, block, boffset, NULL, &oob);
+}
+
+/*
+ * Erase a block within a zone
+ * If erase succedes, it updates free block fifo, otherwise marks block as bad
+ */
+static int sm_erase_block(struct sm_ftl *ftl, int zone_num, u16 block,
+ int put_free)
+{
+ struct ftl_zone *zone = &ftl->zones[zone_num];
+ struct mtd_info *mtd = ftl->trans->mtd;
+ struct erase_info erase;
+
+ erase.mtd = mtd;
+ erase.callback = sm_erase_callback;
+ erase.addr = sm_mkoffset(ftl, zone_num, block, 0);
+ erase.len = ftl->block_size;
+ erase.priv = (u_long)ftl;
+
+ ftl->erase_error = -1;
+
+ if (ftl->unstable)
+ return -EIO;
+
+ BUG_ON(ftl->readonly);
+
+ if (zone_num == 0 && (block == ftl->cis_block || block == 0)) {
+ sm_printk("attempted to erase the CIS!");
+ return -EIO;
+ }
+
+ if (mtd->erase(mtd, &erase)) {
+ sm_printk("erase of block %d in zone %d failed",
+ block, zone_num);
+ goto error;
+ }
+
+ if (erase.state == MTD_ERASE_PENDING)
+ wait_for_completion(&ftl->erase_completion);
+
+ if (ftl->erase_error || erase.state != MTD_ERASE_DONE) {
+ sm_printk("erase of block %d in zone %d failed after wait",
+ block, zone_num);
+ goto error;
+ }
+
+ if (put_free)
+ kfifo_in(&zone->free_sectors,
+ (const unsigned char *)&block, sizeof(block));
+
+ return 0;
+error:
+ if (sm_recheck_media(ftl))
+ return -EIO;
+
+ sm_mark_block_bad(ftl, zone_num, block);
+ return -EIO;
+}
+
+static void sm_erase_callback(struct erase_info *self)
+{
+ struct sm_ftl *ftl = (struct sm_ftl *)self->priv;
+ ftl->erase_error = (self->state == MTD_ERASE_FAILED);
+ complete(&ftl->erase_completion);
+}
+
+/* Throughtly test that block is valid. */
+static int sm_check_block(struct sm_ftl *ftl, int zone, int block)
+{
+ int boffset;
+ struct sm_oob oob;
+ int lbas[] = { -3, 0, 0, 0 };
+ int i = 0;
+ int test_lba;
+
+
+ /* First just check that block doesn't look fishy */
+ /* Only blocks that are valid or are sliced in two parts, are
+ accepted */
+ for (boffset = 0; boffset < ftl->block_size;
+ boffset += SM_SECTOR_SIZE) {
+
+ /* This shoudn't happen anyway */
+ if (sm_read_sector(ftl, zone, block, boffset, NULL, &oob))
+ return -2;
+
+ test_lba = sm_read_lba(&oob);
+
+ if (lbas[i] != test_lba)
+ lbas[++i] = test_lba;
+
+ /* If we found three different LBAs, something is fishy */
+ if (i == 3)
+ return -EIO;
+ }
+
+ /* If the block is sliced (partialy erased usually) erase it */
+ if (i == 2) {
+ sm_erase_block(ftl, zone, block, 1);
+ return 1;
+ }
+
+ return 0;
+}
+
+/* ----------------- media scanning --------------------------------- */
+
+/* Find out media parameters.
+ * This ideally has to be based on nand id, but for now device size is enough */
+int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd)
+{
+ int i;
+ int size_in_megs = mtd->size / (1024 * 1024);
+
+ ftl->readonly = mtd->type == MTD_ROM;
+
+ /* Manual settings for very old devices */
+ ftl->zone_count = 1;
+ ftl->smallpagenand = 0;
+
+ switch (size_in_megs) {
+ case 1:
+ /* 1 Mb flas/rom SmartMedia card (256 byte pages)*/
+ ftl->zone_size = 256;
+ ftl->max_lba = 250;
+ ftl->block_size = 8 * SM_SECTOR_SIZE;
+ ftl->smallpagenand = 1;
+
+ break;
+ case 2:
+ /* 2 Mb flash SmartMedia (256 byte pages)*/
+ if (mtd->writesize == SM_SMALL_PAGE) {
+ ftl->zone_size = 512;
+ ftl->max_lba = 500;
+ ftl->block_size = 8 * SM_SECTOR_SIZE;
+ ftl->smallpagenand = 1;
+ /* 2 Mb rom SmartMedia */
+ } else {
+ ftl->zone_size = 256;
+ ftl->max_lba = 250;
+ ftl->block_size = 16 * SM_SECTOR_SIZE;
+ }
+ break;
+ case 4:
+ /* 4 Mb flash/rom SmartMedia device */
+ ftl->zone_size = 512;
+ ftl->max_lba = 500;
+ ftl->block_size = 16 * SM_SECTOR_SIZE;
+ break;
+ case 8:
+ /* 8 Mb flash/rom SmartMedia device */
+ ftl->zone_size = 1024;
+ ftl->max_lba = 1000;
+ ftl->block_size = 16 * SM_SECTOR_SIZE;
+ }
+
+ /* Minimum xD size is 16M, also, all xD cards have standard zone
+ sizes. SmartMedia cards exist up to 128 Mb and have same layout*/
+ if (size_in_megs >= 16) {
+ ftl->zone_count = size_in_megs / 16;
+ ftl->zone_size = 1024;
+ ftl->max_lba = 1000;
+ ftl->block_size = 32 * SM_SECTOR_SIZE;
+ }
+
+ /* Test for proper write,erase and oob sizes */
+ if (mtd->erasesize > ftl->block_size)
+ return -ENODEV;
+
+ if (mtd->writesize > SM_SECTOR_SIZE)
+ return -ENODEV;
+
+ if (ftl->smallpagenand && mtd->oobsize < SM_SMALL_OOB_SIZE)
+ return -ENODEV;
+
+ if (!ftl->smallpagenand && mtd->oobsize < SM_OOB_SIZE)
+ return -ENODEV;
+
+
+ /* We use these functions for IO */
+ if (!mtd->read_oob || !mtd->write_oob)
+ return -ENODEV;
+
+ /* Find geometry information */
+ for (i = 0 ; i < ARRAY_SIZE(chs_table) ; i++) {
+ if (chs_table[i].size == size_in_megs) {
+ ftl->cylinders = chs_table[i].cyl;
+ ftl->heads = chs_table[i].head;
+ ftl->sectors = chs_table[i].sec;
+ return 0;
+ }
+ }
+
+ sm_printk("media has unknown size : %dMB", size_in_megs);
+ ftl->cylinders = 985;
+ ftl->heads = 33;
+ ftl->sectors = 63;
+ return 0;
+}
+
+/* Validate the CIS */
+static int sm_read_cis(struct sm_ftl *ftl)
+{
+ struct sm_oob oob;
+
+ if (sm_read_sector(ftl,
+ 0, ftl->cis_block, ftl->cis_boffset, ftl->cis_buffer, &oob))
+ return -EIO;
+
+ if (!sm_sector_valid(&oob) || !sm_block_valid(&oob))
+ return -EIO;
+
+ if (!memcmp(ftl->cis_buffer, cis_signature, sizeof(cis_signature)))
+ return 0;
+
+ if (!memcmp(ftl->cis_buffer + SM_SMALL_PAGE, cis_signature,
+ sizeof(cis_signature)))
+ return 0;
+ return -EIO;
+}
+
+/* Scan the media for the CIS */
+static int sm_find_cis(struct sm_ftl *ftl)
+{
+ struct sm_oob oob;
+ int block, boffset;
+ int block_found = 0;
+
+ /* Search for first valid block */
+ for (block = 0 ; block < ftl->zone_size - ftl->max_lba ; block++) {
+
+ if (sm_read_sector(ftl, 0, block, 0, NULL, &oob))
+ continue;
+
+ if (!sm_block_valid(&oob))
+ continue;
+ block_found = 1;
+ break;
+ }
+
+ if (!block_found)
+ return -EIO;
+
+ /* Search for first valid sector in this block */
+ for (boffset = 0 ; boffset < ftl->block_size;
+ boffset += SM_SECTOR_SIZE) {
+
+ if (sm_read_sector(ftl, 0, block, boffset, NULL, &oob))
+ continue;
+
+ if (!sm_sector_valid(&oob))
+ continue;
+ break;
+ }
+
+ if (boffset == ftl->block_size)
+ return -EIO;
+
+ ftl->cis_block = block;
+ ftl->cis_boffset = boffset;
+
+ if (!sm_read_cis(ftl)) {
+ dbg("CIS block found at offset %d",
+ block * ftl->block_size + boffset);
+ return 0;
+ }
+ return -EIO;
+}
+
+/* Basic test to determine if underlying mtd device if functional */
+static int sm_recheck_media(struct sm_ftl *ftl)
+{
+ if (sm_read_cis(ftl)) {
+
+ if (!ftl->unstable) {
+ sm_printk("media unstable, denying writes");
+ ftl->unstable = 1;
+ }
+ return -EIO;
+ }
+ return 0;
+}
+
+/* Initialize a FTL zone */
+static int sm_init_zone(struct sm_ftl *ftl, int zone_num)
+{
+ struct ftl_zone *zone = &ftl->zones[zone_num];
+ struct sm_oob oob;
+ u16 block;
+ int lba;
+ int i = 0;
+
+ dbg("initializing zone %d", zone_num);
+
+ /* Allocate memory for FTL table */
+ zone->lba_to_phys_table = kmalloc(ftl->max_lba * 2, GFP_KERNEL);
+
+ if (!zone->lba_to_phys_table)
+ return -ENOMEM;
+ memset(zone->lba_to_phys_table, -1, ftl->max_lba * 2);
+
+
+ /* Allocate memory for free sectors FIFO */
+ if (kfifo_alloc(&zone->free_sectors, ftl->zone_size * 2, GFP_KERNEL)) {
+ kfree(zone->lba_to_phys_table);
+ return -ENOMEM;
+ }
+
+ /* Now scan the zone */
+ for (block = 0 ; block < ftl->zone_size ; block++) {
+
+ /* Skip blocks till the CIS (including) */
+ if (zone_num == 0 && block <= ftl->cis_block)
+ continue;
+
+ /* Read the oob of first sector */
+ if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob))
+ return -EIO;
+
+ /* Test to see if block is erased. It is enough to test
+ first sector, because erase happens in one shot */
+ if (sm_block_erased(&oob)) {
+ kfifo_in(&zone->free_sectors,
+ (unsigned char *)&block, 2);
+ continue;
+ }
+
+ /* If block is marked as bad, skip it */
+ /* This assumes we can trust first sector*/
+ /* However the way the block valid status is defined, ensures
+ very low probability of failure here */
+ if (!sm_block_valid(&oob)) {
+ dbg("PH %04d <-> <marked bad>", block);
+ continue;
+ }
+
+
+ lba = sm_read_lba(&oob);
+
+ /* Invalid LBA means that block is damaged. */
+ /* We can try to erase it, or mark it as bad, but
+ lets leave that to recovery application */
+ if (lba == -2 || lba >= ftl->max_lba) {
+ dbg("PH %04d <-> LBA %04d(bad)", block, lba);
+ continue;
+ }
+
+
+ /* If there is no collision,
+ just put the sector in the FTL table */
+ if (zone->lba_to_phys_table[lba] < 0) {
+ /*dbg("PH %04d <-> LBA %04d", block, lba);*/
+ zone->lba_to_phys_table[lba] = block;
+ continue;
+ }
+
+ sm_printk("collision"
+ " of LBA %d between blocks %d and %d in zone %d",
+ lba, zone->lba_to_phys_table[lba], block, zone_num);
+
+ /* Test that this block is valid*/
+ if (sm_check_block(ftl, zone_num, block))
+ continue;
+
+ /* Test now the old block */
+ if (sm_check_block(ftl, zone_num,
+ zone->lba_to_phys_table[lba])) {
+ zone->lba_to_phys_table[lba] = block;
+ continue;
+ }
+
+ /* If both blocks are valid and share same LBA, it means that
+ they hold different versions of same data. It not
+ known which is more recent, thus just erase one of them
+ */
+ sm_printk("both blocks are valid, erasing the later");
+ sm_erase_block(ftl, zone_num, block, 1);
+ }
+
+ dbg("zone initialized");
+ zone->initialized = 1;
+
+ /* No free sectors, means that the zone is heavily damaged, write won't
+ work, but it can still can be (partially) read */
+ if (!kfifo_len(&zone->free_sectors)) {
+ sm_printk("no free blocks in zone %d", zone_num);
+ return 0;
+ }
+
+ /* Randomize first block we write to */
+ get_random_bytes(&i, 2);
+ i %= (kfifo_len(&zone->free_sectors) / 2);
+
+ while (i--) {
+ kfifo_out(&zone->free_sectors, (unsigned char *)&block, 2);
+ kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2);
+ }
+ return 0;
+}
+
+/* Get and automaticly initialize an FTL mapping for one zone */
+struct ftl_zone *sm_get_zone(struct sm_ftl *ftl, int zone_num)
+{
+ struct ftl_zone *zone;
+ int error;
+
+ BUG_ON(zone_num >= ftl->zone_count);
+ zone = &ftl->zones[zone_num];
+
+ if (!zone->initialized) {
+ error = sm_init_zone(ftl, zone_num);
+
+ if (error)
+ return ERR_PTR(error);
+ }
+ return zone;
+}
+
+
+/* ----------------- cache handling ------------------------------------------*/
+
+/* Initialize the one block cache */
+void sm_cache_init(struct sm_ftl *ftl)
+{
+ ftl->cache_data_invalid_bitmap = 0xFFFFFFFF;
+ ftl->cache_clean = 1;
+ ftl->cache_zone = -1;
+ ftl->cache_block = -1;
+ /*memset(ftl->cache_data, 0xAA, ftl->block_size);*/
+}
+
+/* Put sector in one block cache */
+void sm_cache_put(struct sm_ftl *ftl, char *buffer, int boffset)
+{
+ memcpy(ftl->cache_data + boffset, buffer, SM_SECTOR_SIZE);
+ clear_bit(boffset / SM_SECTOR_SIZE, &ftl->cache_data_invalid_bitmap);
+ ftl->cache_clean = 0;
+}
+
+/* Read a sector from the cache */
+int sm_cache_get(struct sm_ftl *ftl, char *buffer, int boffset)
+{
+ if (test_bit(boffset / SM_SECTOR_SIZE,
+ &ftl->cache_data_invalid_bitmap))
+ return -1;
+
+ memcpy(buffer, ftl->cache_data + boffset, SM_SECTOR_SIZE);
+ return 0;
+}
+
+/* Write the cache to hardware */
+int sm_cache_flush(struct sm_ftl *ftl)
+{
+ struct ftl_zone *zone;
+
+ int sector_num;
+ u16 write_sector;
+ int zone_num = ftl->cache_zone;
+ int block_num;
+
+ if (ftl->cache_clean)
+ return 0;
+
+ if (ftl->unstable)
+ return -EIO;
+
+ BUG_ON(zone_num < 0);
+ zone = &ftl->zones[zone_num];
+ block_num = zone->lba_to_phys_table[ftl->cache_block];
+
+
+ /* Try to read all unread areas of the cache block*/
+ for_each_bit(sector_num, &ftl->cache_data_invalid_bitmap,
+ ftl->block_size / SM_SECTOR_SIZE) {
+
+ if (!sm_read_sector(ftl,
+ zone_num, block_num, sector_num * SM_SECTOR_SIZE,
+ ftl->cache_data + sector_num * SM_SECTOR_SIZE, NULL))
+ clear_bit(sector_num,
+ &ftl->cache_data_invalid_bitmap);
+ }
+restart:
+ /* No spare blocks */
+ /* We could still continue by erasing the current block,
+ but for such worn out media it doesn't worth the trouble,
+ and the dangers */
+
+ if (!kfifo_len(&zone->free_sectors)) {
+ dbg("no free sectors for write!");
+ return -EIO;
+ }
+
+ kfifo_out(&zone->free_sectors, (unsigned char *)&write_sector, 2);
+
+ if (sm_write_block(ftl, ftl->cache_data, zone_num, write_sector,
+ ftl->cache_block, ftl->cache_data_invalid_bitmap))
+ goto restart;
+
+ /* Update the FTL table */
+ zone->lba_to_phys_table[ftl->cache_block] = write_sector;
+
+ /* Write succesfull, so erase and free the old block */
+ if (block_num > 0)
+ sm_erase_block(ftl, zone_num, block_num, 1);
+
+ sm_cache_init(ftl);
+ return 0;
+}
+
+
+/* flush timer, runs a second aftet last write */
+static void sm_cache_flush_timer(unsigned long data)
+{
+ struct sm_ftl *ftl = (struct sm_ftl *)data;
+ queue_work(cache_flush_workqueue, &ftl->flush_work);
+}
+
+/* cache flush work, kicked by timer */
+static void sm_cache_flush_work(struct work_struct *work)
+{
+ struct sm_ftl *ftl = container_of(work, struct sm_ftl, flush_work);
+ mutex_lock(&ftl->mutex);
+ sm_cache_flush(ftl);
+ mutex_unlock(&ftl->mutex);
+ return;
+}
+
+/* ---------------- outside interface -------------------------------------- */
+
+/* outside interface: read a sector */
+static int sm_read(struct mtd_blktrans_dev *dev,
+ unsigned long sect_no, char *buf)
+{
+ struct sm_ftl *ftl = dev->priv;
+ struct ftl_zone *zone;
+ int error = 0, in_cache = 0;
+ int zone_num, block, boffset;
+
+ sm_break_offset(ftl, sect_no << 9, &zone_num, &block, &boffset);
+ mutex_lock(&ftl->mutex);
+
+
+ zone = sm_get_zone(ftl, zone_num);
+ if (IS_ERR(zone)) {
+ error = PTR_ERR(zone);
+ goto unlock;
+ }
+
+
+ /* Have to look at cache first */
+ if (ftl->cache_zone == zone_num && ftl->cache_block == block) {
+ in_cache = 1;
+ if (!sm_cache_get(ftl, buf, boffset))
+ goto unlock;
+ }
+
+ /* Translate the block and return if doesn't exist in the table */
+ block = zone->lba_to_phys_table[block];
+
+ if (block == -1) {
+ memset(buf, 0xFF, SM_SECTOR_SIZE);
+ goto unlock;
+ }
+
+ if (block == -2) {
+ error = -EIO;
+ goto unlock;
+ }
+
+ if (sm_read_sector(ftl, zone_num, block, boffset, buf, NULL)) {
+ error = -EIO;
+ goto unlock;
+ }
+
+ if (in_cache)
+ sm_cache_put(ftl, buf, boffset);
+unlock:
+ mutex_unlock(&ftl->mutex);
+ return error;
+}
+
+/* outside interface: write a sector */
+static int sm_write(struct mtd_blktrans_dev *dev,
+ unsigned long sec_no, char *buf)
+{
+ struct sm_ftl *ftl = dev->priv;
+ struct ftl_zone *zone;
+ int error, zone_num, block, boffset;
+
+ BUG_ON(ftl->readonly);
+ sm_break_offset(ftl, sec_no << 9, &zone_num, &block, &boffset);
+
+ /* No need in flush thread running now */
+ del_timer(&ftl->timer);
+ mutex_lock(&ftl->mutex);
+
+ zone = sm_get_zone(ftl, zone_num);
+ if (IS_ERR(zone)) {
+ error = PTR_ERR(zone);
+ goto unlock;
+ }
+
+ /* If entry is not in cache, flush it */
+ if (ftl->cache_block != block || ftl->cache_zone != zone_num) {
+
+ error = sm_cache_flush(ftl);
+ if (error)
+ goto unlock;
+
+ ftl->cache_block = block;
+ ftl->cache_zone = zone_num;
+ }
+
+ sm_cache_put(ftl, buf, boffset);
+unlock:
+ mod_timer(&ftl->timer, jiffies + msecs_to_jiffies(cache_timeout));
+ mutex_unlock(&ftl->mutex);
+ return error;
+}
+
+/* outside interface: flush everything */
+static int sm_flush(struct mtd_blktrans_dev *dev)
+{
+ struct sm_ftl *ftl = dev->priv;
+ int retval;
+
+ mutex_lock(&ftl->mutex);
+ retval = sm_cache_flush(ftl);
+ mutex_unlock(&ftl->mutex);
+ return retval;
+}
+
+/* outside interface: device is released */
+static int sm_release(struct mtd_blktrans_dev *dev)
+{
+ struct sm_ftl *ftl = dev->priv;
+
+ mutex_lock(&ftl->mutex);
+ del_timer_sync(&ftl->timer);
+ cancel_work_sync(&ftl->flush_work);
+ sm_cache_flush(ftl);
+ mutex_unlock(&ftl->mutex);
+ return 0;
+}
+
+/* outside interface: get geometry */
+static int sm_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
+{
+ struct sm_ftl *ftl = dev->priv;
+ geo->heads = ftl->heads;
+ geo->sectors = ftl->sectors;
+ geo->cylinders = ftl->cylinders;
+ return 0;
+}
+
+/* external interface: main initialization function */
+static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
+{
+ struct mtd_blktrans_dev *trans;
+ struct sm_ftl *ftl;
+
+ /* Allocate & initialize our private structure */
+ ftl = kzalloc(sizeof(struct sm_ftl), GFP_KERNEL);
+ if (!ftl)
+ goto error1;
+
+ mutex_init(&ftl->mutex);
+ setup_timer(&ftl->timer, sm_cache_flush_timer, (unsigned long)ftl);
+ INIT_WORK(&ftl->flush_work, sm_cache_flush_work);
+ init_completion(&ftl->erase_completion);
+
+
+ /* Read media information */
+ if (sm_get_media_info(ftl, mtd))
+ goto error2;
+
+ /* Allocate temporary CIS buffer for read retry support */
+ ftl->cis_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL);
+ if (!ftl->cis_buffer)
+ goto error2;
+
+ /* Allocate zone array, it will be initialized on demand */
+ ftl->zones = kzalloc(sizeof(struct ftl_zone) * ftl->zone_count,
+ GFP_KERNEL);
+ if (!ftl->zones)
+ goto error3;
+
+ /* Allocate the cache*/
+ ftl->cache_data = kzalloc(ftl->block_size, GFP_KERNEL);
+
+ if (!ftl->cache_data)
+ goto error4;
+
+ sm_cache_init(ftl);
+
+ /* Allocate upper layer structure and initialize it */
+ trans = kzalloc(sizeof(struct mtd_blktrans_dev), GFP_KERNEL);
+ if (!trans)
+ goto error5;
+
+ ftl->trans = trans;
+ trans->priv = ftl;
+
+ trans->tr = tr;
+ trans->mtd = mtd;
+ trans->devnum = -1;
+ trans->size = (ftl->block_size * ftl->max_lba * ftl->zone_count) >> 9;
+ trans->readonly = ftl->readonly;
+
+ if (sm_find_cis(ftl))
+ goto error6;
+
+ /* Register device*/
+ if (add_mtd_blktrans_dev(trans))
+ goto error6;
+
+ dbg("Found %d MiB SmartMedia/xD card on %s",
+ (int)(mtd->size / (1024 * 1024)), mtd->name);
+
+ dbg("FTL layout:");
+ dbg("%d zone(s), each consists of %d blocks (+%d spares)",
+ ftl->zone_count, ftl->max_lba,
+ ftl->zone_size - ftl->max_lba);
+ dbg("each block consists of %d bytes",
+ ftl->block_size);
+
+ return;
+error6:
+ kfree(trans);
+error5:
+ kfree(ftl->cache_data);
+error4:
+ kfree(ftl->zones);
+error3:
+ kfree(ftl->cis_buffer);
+error2:
+ kfree(ftl);
+error1:
+ return;
+}
+
+/* main interface: device {surprise,} removal */
+static void sm_remove_dev(struct mtd_blktrans_dev *dev)
+{
+ struct sm_ftl *ftl = dev->priv;
+ int i;
+
+ del_mtd_blktrans_dev(dev);
+
+ for (i = 0 ; i < ftl->zone_count; i++) {
+
+ if (!ftl->zones[i].initialized)
+ continue;
+
+ kfree(ftl->zones[i].lba_to_phys_table);
+ kfifo_free(&ftl->zones[i].free_sectors);
+ }
+
+ kfree(ftl->zones);
+ kfree(ftl->cache_data);
+ kfree(ftl);
+}
+
+static struct mtd_blktrans_ops sm_ftl_ops = {
+ .name = "smblk",
+ .major = -1,
+ .part_bits = SM_FTL_PARTN_BITS,
+ .blksize = SM_SECTOR_SIZE,
+ .getgeo = sm_getgeo,
+
+ .add_mtd = sm_add_mtd,
+ .remove_dev = sm_remove_dev,
+
+ .readsect = sm_read,
+ .writesect = sm_write,
+
+ .flush = sm_flush,
+ .release = sm_release,
+
+ .owner = THIS_MODULE,
+};
+
+static __init int sm_module_init(void)
+{
+ int error = 0;
+ cache_flush_workqueue = create_freezeable_workqueue("smflush");
+
+ if (IS_ERR(cache_flush_workqueue))
+ return PTR_ERR(cache_flush_workqueue);
+
+ error = register_mtd_blktrans(&sm_ftl_ops);
+ if (error)
+ destroy_workqueue(cache_flush_workqueue);
+
+ return error;
+
+}
+
+static void __exit sm_module_exit(void)
+{
+ destroy_workqueue(cache_flush_workqueue);
+ deregister_mtd_blktrans(&sm_ftl_ops);
+}
+
+module_init(sm_module_init);
+module_exit(sm_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
+MODULE_DESCRIPTION("Smartmedia/xD mtd translation layer");
diff --git a/drivers/mtd/sm_ftl.h b/drivers/mtd/sm_ftl.h
new file mode 100644
index 0000000..1fd21ad
--- /dev/null
+++ b/drivers/mtd/sm_ftl.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2009 - Maxim Levitsky
+ * SmartMedia/xD translation layer
+ *
+ * Based loosly on ssfdc.c which is
+ * (c) 2005 Eptar srl
+ * Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
+ *
+ * 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/mtd/blktrans.h>
+#include <linux/kfifo.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+
+struct ftl_zone {
+ int initialized;
+ s16 *lba_to_phys_table; /* LBA to physical table */
+ struct kfifo free_sectors; /* queue of free sectors */
+};
+
+struct sm_ftl {
+ struct mtd_blktrans_dev *trans;
+
+ struct mutex mutex; /* protects the structure */
+ struct ftl_zone *zones; /* FTL tables for each zone */
+
+ /* Media information */
+ int block_size; /* block size in bytes */
+ int zone_size; /* zone size in blocks */
+ int zone_count; /* number of zones */
+ int max_lba; /* maximum lba in a zone */
+ int smallpagenand; /* 256 bytes/page nand */
+ int readonly; /* is FS readonly */
+ int unstable;
+ int cis_block; /* CIS block location */
+ int cis_boffset; /* CIS offset in the block */
+ void *cis_buffer; /* tmp buffer for cis reads */
+
+ /* Cache */
+ int cache_block; /* block number of cached block */
+ int cache_zone; /* zone of cached block */
+ unsigned char *cache_data; /* cached block data */
+ long unsigned int cache_data_invalid_bitmap;
+ int cache_clean;
+ struct work_struct flush_work;
+ struct timer_list timer;
+
+ /* Async erase stuff */
+ struct completion erase_completion;
+ int erase_error;
+
+ /* Geometry stuff */
+ int heads;
+ int sectors;
+ int cylinders;
+};
+
+struct chs_entry {
+ unsigned long size;
+ unsigned short cyl;
+ unsigned char head;
+ unsigned char sec;
+};
+
+
+#define SM_FTL_PARTN_BITS 3
+
+#define sm_printk(format, ...) \
+ printk(KERN_WARNING "sm_ftl" ": " format "\n", ## __VA_ARGS__)
+
+
+#define __DEBUG
+#ifdef __DEBUG
+
+#define dbg(format, ...) \
+ printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
+#else
+
+#define dbg(format, ...)
+
+#endif
+
+static void sm_erase_callback(struct erase_info *self);
+static int sm_erase_block(struct sm_ftl *ftl, int zone_num, u16 block,
+ int put_free);
+static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block);
+
+static int sm_recheck_media(struct sm_ftl *ftl);
--
1.6.3.3
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