Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b37bde147890c8fea8369a5a4e230dabdea4ebfb
Commit:     b37bde147890c8fea8369a5a4e230dabdea4ebfb
Parent:     c4a9f88daf6c382fedde4cdddef0b30f1d0a20db
Author:     Bryan Wu <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 2 13:56:05 2007 -0700
Committer:  David Woodhouse <[EMAIL PROTECTED]>
CommitDate: Sat Oct 13 14:36:49 2007 +0100

    [MTD] [NAND] Blackfin on-chip NAND Flash Controller driver
    
    This is the driver for latest Blackfin on-chip nand flash controller
    
     - use nand_chip and mtd_info common nand driver interface
     - provide both PIO and dma operation
     - compiled with ezkit bf548 configuration
     - use hardware 1-bit ECC
     - tested with YAFFS2 and can mount YAFFS2 filesystem as rootfs
    
    ChangeLog from try#1
     - use hweight32() instead of count_bits()
     - replace bf54x with bf5xx and BF54X with BF5XX
     - compare against plat->page_size in 2 cases when enable hardware ECC
    
    ChangeLog from try#2
     - passed nand_test suites
     - use cpu_relax() instead of busy wait loop
     - some coding style issue pointed out by Andrew
    
    Signed-off-by: Bryan Wu <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: David Woodhouse <[EMAIL PROTECTED]>
---
 drivers/mtd/nand/Kconfig              |   19 +
 drivers/mtd/nand/Makefile             |    1 +
 drivers/mtd/nand/bf5xx_nand.c         |  788 +++++++++++++++++++++++++++++++++
 include/asm-blackfin/mach-bf548/dma.h |    1 +
 include/asm-blackfin/nand.h           |   47 ++
 5 files changed, 856 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index d3ec309..8f9c3ba 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -91,6 +91,25 @@ config MTD_NAND_AU1550
          This enables the driver for the NAND flash controller on the
          AMD/Alchemy 1550 SOC.
 
+config MTD_NAND_BF5XX
+       tristate "Blackfin on-chip NAND Flash Controller driver"
+       depends on BF54x && MTD_NAND
+       help
+         This enables the Blackfin on-chip NAND flash controller
+
+         No board specific support is done by this driver, each board
+         must advertise a platform_device for the driver to attach.
+
+         This driver can also be built as a module. If so, the module
+         will be called bf5xx-nand.
+
+config MTD_NAND_BF5XX_HWECC
+       bool "BF5XX NAND Hardware ECC"
+       depends on MTD_NAND_BF5XX
+       help
+         Enable the use of the BF5XX's internal ECC generator when
+         using NAND.
+
 config MTD_NAND_RTC_FROM4
        tristate "Renesas Flash ROM 4-slot interface board (FROM_BOARD4)"
        depends on SH_SOLUTION_ENGINE
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 7412561..3ad6c01 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_MTD_NAND_TOTO)           += toto.o
 obj-$(CONFIG_MTD_NAND_AUTCPU12)                += autcpu12.o
 obj-$(CONFIG_MTD_NAND_EDB7312)         += edb7312.o
 obj-$(CONFIG_MTD_NAND_AU1550)          += au1550nd.o
+obj-$(CONFIG_MTD_NAND_BF5XX)           += bf5xx_nand.o
 obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB)  += ppchameleonevb.o
 obj-$(CONFIG_MTD_NAND_S3C2410)         += s3c2410.o
 obj-$(CONFIG_MTD_NAND_DISKONCHIP)      += diskonchip.o
diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
new file mode 100644
index 0000000..1657ecd
--- /dev/null
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -0,0 +1,788 @@
+/* linux/drivers/mtd/nand/bf5xx_nand.c
+ *
+ * Copyright 2006-2007 Analog Devices Inc.
+ *     http://blackfin.uclinux.org/
+ *     Bryan Wu <[EMAIL PROTECTED]>
+ *
+ * Blackfin BF5xx on-chip NAND flash controler driver
+ *
+ * Derived from drivers/mtd/nand/s3c2410.c
+ * Copyright (c) 2007 Ben Dooks <[EMAIL PROTECTED]>
+ *
+ * Derived from drivers/mtd/nand/cafe.c
+ * Copyright © 2006 Red Hat, Inc.
+ * Copyright © 2006 David Woodhouse <[EMAIL PROTECTED]>
+ *
+ * Changelog:
+ *     12-Jun-2007  Bryan Wu:  Initial version
+ *     18-Jul-2007  Bryan Wu:
+ *             - ECC_HW and ECC_SW supported
+ *             - DMA supported in ECC_HW
+ *             - YAFFS tested as rootfs in both ECC_HW and ECC_SW
+ *
+ * TODO:
+ *     Enable JFFS2 over NAND as rootfs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/bitops.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/blackfin.h>
+#include <asm/dma.h>
+#include <asm/cacheflush.h>
+#include <asm/nand.h>
+#include <asm/portmux.h>
+
+#define DRV_NAME       "bf5xx-nand"
+#define DRV_VERSION    "1.2"
+#define DRV_AUTHOR     "Bryan Wu <[EMAIL PROTECTED]>"
+#define DRV_DESC       "BF5xx on-chip NAND FLash Controller Driver"
+
+#ifdef CONFIG_MTD_NAND_BF5XX_HWECC
+static int hardware_ecc = 1;
+#else
+static int hardware_ecc;
+#endif
+
+static unsigned short bfin_nfc_pin_req[] = {P_NAND_CE, P_NAND_RB, 0};
+
+/*
+ * Data structures for bf5xx nand flash controller driver
+ */
+
+/* bf5xx nand info */
+struct bf5xx_nand_info {
+       /* mtd info */
+       struct nand_hw_control          controller;
+       struct mtd_info                 mtd;
+       struct nand_chip                chip;
+
+       /* platform info */
+       struct bf5xx_nand_platform      *platform;
+
+       /* device info */
+       struct device                   *device;
+
+       /* DMA stuff */
+       struct completion               dma_completion;
+};
+
+/*
+ * Conversion functions
+ */
+static struct bf5xx_nand_info *mtd_to_nand_info(struct mtd_info *mtd)
+{
+       return container_of(mtd, struct bf5xx_nand_info, mtd);
+}
+
+static struct bf5xx_nand_info *to_nand_info(struct platform_device *pdev)
+{
+       return platform_get_drvdata(pdev);
+}
+
+static struct bf5xx_nand_platform *to_nand_plat(struct platform_device *pdev)
+{
+       return pdev->dev.platform_data;
+}
+
+/*
+ * struct nand_chip interface function pointers
+ */
+
+/*
+ * bf5xx_nand_hwcontrol
+ *
+ * Issue command and address cycles to the chip
+ */
+static void bf5xx_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+                                  unsigned int ctrl)
+{
+       if (cmd == NAND_CMD_NONE)
+               return;
+
+       while (bfin_read_NFC_STAT() & WB_FULL)
+               cpu_relax();
+
+       if (ctrl & NAND_CLE)
+               bfin_write_NFC_CMD(cmd);
+       else
+               bfin_write_NFC_ADDR(cmd);
+       SSYNC();
+}
+
+/*
+ * bf5xx_nand_devready()
+ *
+ * returns 0 if the nand is busy, 1 if it is ready
+ */
+static int bf5xx_nand_devready(struct mtd_info *mtd)
+{
+       unsigned short val = bfin_read_NFC_IRQSTAT();
+
+       if ((val & NBUSYIRQ) == NBUSYIRQ)
+               return 1;
+       else
+               return 0;
+}
+
+/*
+ * ECC functions
+ * These allow the bf5xx to use the controller's ECC
+ * generator block to ECC the data as it passes through
+ */
+
+/*
+ * ECC error correction function
+ */
+static int bf5xx_nand_correct_data_256(struct mtd_info *mtd, u_char *dat,
+                                       u_char *read_ecc, u_char *calc_ecc)
+{
+       struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
+       u32 syndrome[5];
+       u32 calced, stored;
+       int i;
+       unsigned short failing_bit, failing_byte;
+       u_char data;
+
+       calced = calc_ecc[0] | (calc_ecc[1] << 8) | (calc_ecc[2] << 16);
+       stored = read_ecc[0] | (read_ecc[1] << 8) | (read_ecc[2] << 16);
+
+       syndrome[0] = (calced ^ stored);
+
+       /*
+        * syndrome 0: all zero
+        * No error in data
+        * No action
+        */
+       if (!syndrome[0] || !calced || !stored)
+               return 0;
+
+       /*
+        * sysdrome 0: only one bit is one
+        * ECC data was incorrect
+        * No action
+        */
+       if (hweight32(syndrome[0]) == 1) {
+               dev_err(info->device, "ECC data was incorrect!\n");
+               return 1;
+       }
+
+       syndrome[1] = (calced & 0x7FF) ^ (stored & 0x7FF);
+       syndrome[2] = (calced & 0x7FF) ^ ((calced >> 11) & 0x7FF);
+       syndrome[3] = (stored & 0x7FF) ^ ((stored >> 11) & 0x7FF);
+       syndrome[4] = syndrome[2] ^ syndrome[3];
+
+       for (i = 0; i < 5; i++)
+               dev_info(info->device, "syndrome[%d] 0x%08x\n", i, syndrome[i]);
+
+       dev_info(info->device,
+               "calced[0x%08x], stored[0x%08x]\n",
+               calced, stored);
+
+       /*
+        * sysdrome 0: exactly 11 bits are one, each parity
+        * and parity' pair is 1 & 0 or 0 & 1.
+        * 1-bit correctable error
+        * Correct the error
+        */
+       if (hweight32(syndrome[0]) == 11 && syndrome[4] == 0x7FF) {
+               dev_info(info->device,
+                       "1-bit correctable error, correct it.\n");
+               dev_info(info->device,
+                       "syndrome[1] 0x%08x\n", syndrome[1]);
+
+               failing_bit = syndrome[1] & 0x7;
+               failing_byte = syndrome[1] >> 0x3;
+               data = *(dat + failing_byte);
+               data = data ^ (0x1 << failing_bit);
+               *(dat + failing_byte) = data;
+
+               return 0;
+       }
+
+       /*
+        * sysdrome 0: random data
+        * More than 1-bit error, non-correctable error
+        * Discard data, mark bad block
+        */
+       dev_err(info->device,
+               "More than 1-bit error, non-correctable error.\n");
+       dev_err(info->device,
+               "Please discard data, mark bad block\n");
+
+       return 1;
+}
+
+static int bf5xx_nand_correct_data(struct mtd_info *mtd, u_char *dat,
+                                       u_char *read_ecc, u_char *calc_ecc)
+{
+       struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
+       struct bf5xx_nand_platform *plat = info->platform;
+       unsigned short page_size = (plat->page_size ? 512 : 256);
+       int ret;
+
+       ret = bf5xx_nand_correct_data_256(mtd, dat, read_ecc, calc_ecc);
+
+       /* If page size is 512, correct second 256 bytes */
+       if (page_size == 512) {
+               dat += 256;
+               read_ecc += 8;
+               calc_ecc += 8;
+               ret = bf5xx_nand_correct_data_256(mtd, dat, read_ecc, calc_ecc);
+       }
+
+       return ret;
+}
+
+static void bf5xx_nand_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+       return;
+}
+
+static int bf5xx_nand_calculate_ecc(struct mtd_info *mtd,
+               const u_char *dat, u_char *ecc_code)
+{
+       struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
+       struct bf5xx_nand_platform *plat = info->platform;
+       u16 page_size = (plat->page_size ? 512 : 256);
+       u16 ecc0, ecc1;
+       u32 code[2];
+       u8 *p;
+       int bytes = 3, i;
+
+       /* first 4 bytes ECC code for 256 page size */
+       ecc0 = bfin_read_NFC_ECC0();
+       ecc1 = bfin_read_NFC_ECC1();
+
+       code[0] = (ecc0 & 0x3FF) | ((ecc1 & 0x3FF) << 11);
+
+       dev_dbg(info->device, "returning ecc 0x%08x\n", code[0]);
+
+       /* second 4 bytes ECC code for 512 page size */
+       if (page_size == 512) {
+               ecc0 = bfin_read_NFC_ECC2();
+               ecc1 = bfin_read_NFC_ECC3();
+               code[1] = (ecc0 & 0x3FF) | ((ecc1 & 0x3FF) << 11);
+               bytes = 6;
+               dev_dbg(info->device, "returning ecc 0x%08x\n", code[1]);
+       }
+
+       p = (u8 *)code;
+       for (i = 0; i < bytes; i++)
+               ecc_code[i] = p[i];
+
+       return 0;
+}
+
+/*
+ * PIO mode for buffer writing and reading
+ */
+static void bf5xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+       int i;
+       unsigned short val;
+
+       /*
+        * Data reads are requested by first writing to NFC_DATA_RD
+        * and then reading back from NFC_READ.
+        */
+       for (i = 0; i < len; i++) {
+               while (bfin_read_NFC_STAT() & WB_FULL)
+                       cpu_relax();
+
+               /* Contents do not matter */
+               bfin_write_NFC_DATA_RD(0x0000);
+               SSYNC();
+
+               while ((bfin_read_NFC_IRQSTAT() & RD_RDY) != RD_RDY)
+                       cpu_relax();
+
+               buf[i] = bfin_read_NFC_READ();
+
+               val = bfin_read_NFC_IRQSTAT();
+               val |= RD_RDY;
+               bfin_write_NFC_IRQSTAT(val);
+               SSYNC();
+       }
+}
+
+static uint8_t bf5xx_nand_read_byte(struct mtd_info *mtd)
+{
+       uint8_t val;
+
+       bf5xx_nand_read_buf(mtd, &val, 1);
+
+       return val;
+}
+
+static void bf5xx_nand_write_buf(struct mtd_info *mtd,
+                               const uint8_t *buf, int len)
+{
+       int i;
+
+       for (i = 0; i < len; i++) {
+               while (bfin_read_NFC_STAT() & WB_FULL)
+                       cpu_relax();
+
+               bfin_write_NFC_DATA_WR(buf[i]);
+               SSYNC();
+       }
+}
+
+static void bf5xx_nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+       int i;
+       u16 *p = (u16 *) buf;
+       len >>= 1;
+
+       /*
+        * Data reads are requested by first writing to NFC_DATA_RD
+        * and then reading back from NFC_READ.
+        */
+       bfin_write_NFC_DATA_RD(0x5555);
+
+       SSYNC();
+
+       for (i = 0; i < len; i++)
+               p[i] = bfin_read_NFC_READ();
+}
+
+static void bf5xx_nand_write_buf16(struct mtd_info *mtd,
+                               const uint8_t *buf, int len)
+{
+       int i;
+       u16 *p = (u16 *) buf;
+       len >>= 1;
+
+       for (i = 0; i < len; i++)
+               bfin_write_NFC_DATA_WR(p[i]);
+
+       SSYNC();
+}
+
+/*
+ * DMA functions for buffer writing and reading
+ */
+static irqreturn_t bf5xx_nand_dma_irq(int irq, void *dev_id)
+{
+       struct bf5xx_nand_info *info = dev_id;
+
+       clear_dma_irqstat(CH_NFC);
+       disable_dma(CH_NFC);
+       complete(&info->dma_completion);
+
+       return IRQ_HANDLED;
+}
+
+static int bf5xx_nand_dma_rw(struct mtd_info *mtd,
+                               uint8_t *buf, int is_read)
+{
+       struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
+       struct bf5xx_nand_platform *plat = info->platform;
+       unsigned short page_size = (plat->page_size ? 512 : 256);
+       unsigned short val;
+
+       dev_dbg(info->device, " mtd->%p, buf->%p, is_read %d\n",
+                       mtd, buf, is_read);
+
+       /*
+        * Before starting a dma transfer, be sure to invalidate/flush
+        * the cache over the address range of your DMA buffer to
+        * prevent cache coherency problems. Otherwise very subtle bugs
+        * can be introduced to your driver.
+        */
+       if (is_read)
+               invalidate_dcache_range((unsigned int)buf,
+                               (unsigned int)(buf + page_size));
+       else
+               flush_dcache_range((unsigned int)buf,
+                               (unsigned int)(buf + page_size));
+
+       /*
+        * This register must be written before each page is
+        * transferred to generate the correct ECC register
+        * values.
+        */
+       bfin_write_NFC_RST(0x1);
+       SSYNC();
+
+       disable_dma(CH_NFC);
+       clear_dma_irqstat(CH_NFC);
+
+       /* setup DMA register with Blackfin DMA API */
+       set_dma_config(CH_NFC, 0x0);
+       set_dma_start_addr(CH_NFC, (unsigned long) buf);
+       set_dma_x_count(CH_NFC, (page_size >> 2));
+       set_dma_x_modify(CH_NFC, 4);
+
+       /* setup write or read operation */
+       val = DI_EN | WDSIZE_32;
+       if (is_read)
+               val |= WNR;
+       set_dma_config(CH_NFC, val);
+       enable_dma(CH_NFC);
+
+       /* Start PAGE read/write operation */
+       if (is_read)
+               bfin_write_NFC_PGCTL(0x1);
+       else
+               bfin_write_NFC_PGCTL(0x2);
+       wait_for_completion(&info->dma_completion);
+
+       return 0;
+}
+
+static void bf5xx_nand_dma_read_buf(struct mtd_info *mtd,
+                                       uint8_t *buf, int len)
+{
+       struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
+       struct bf5xx_nand_platform *plat = info->platform;
+       unsigned short page_size = (plat->page_size ? 512 : 256);
+
+       dev_dbg(info->device, "mtd->%p, buf->%p, int %d\n", mtd, buf, len);
+
+       if (len == page_size)
+               bf5xx_nand_dma_rw(mtd, buf, 1);
+       else
+               bf5xx_nand_read_buf(mtd, buf, len);
+}
+
+static void bf5xx_nand_dma_write_buf(struct mtd_info *mtd,
+                               const uint8_t *buf, int len)
+{
+       struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
+       struct bf5xx_nand_platform *plat = info->platform;
+       unsigned short page_size = (plat->page_size ? 512 : 256);
+
+       dev_dbg(info->device, "mtd->%p, buf->%p, len %d\n", mtd, buf, len);
+
+       if (len == page_size)
+               bf5xx_nand_dma_rw(mtd, (uint8_t *)buf, 0);
+       else
+               bf5xx_nand_write_buf(mtd, buf, len);
+}
+
+/*
+ * System initialization functions
+ */
+
+static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
+{
+       int ret;
+       unsigned short val;
+
+       /* Do not use dma */
+       if (!hardware_ecc)
+               return 0;
+
+       init_completion(&info->dma_completion);
+
+       /* Setup DMAC1 channel mux for NFC which shared with SDH */
+       val = bfin_read_DMAC1_PERIMUX();
+       val &= 0xFFFE;
+       bfin_write_DMAC1_PERIMUX(val);
+       SSYNC();
+
+       /* Request NFC DMA channel */
+       ret = request_dma(CH_NFC, "BF5XX NFC driver");
+       if (ret < 0) {
+               dev_err(info->device, " unable to get DMA channel\n");
+               return ret;
+       }
+
+       set_dma_callback(CH_NFC, (void *) bf5xx_nand_dma_irq, (void *) info);
+
+       /* Turn off the DMA channel first */
+       disable_dma(CH_NFC);
+       return 0;
+}
+
+/*
+ * BF5XX NFC hardware initialization
+ *  - pin mux setup
+ *  - clear interrupt status
+ */
+static int bf5xx_nand_hw_init(struct bf5xx_nand_info *info)
+{
+       int err = 0;
+       unsigned short val;
+       struct bf5xx_nand_platform *plat = info->platform;
+
+       /* setup NFC_CTL register */
+       dev_info(info->device,
+               "page_size=%d, data_width=%d, wr_dly=%d, rd_dly=%d\n",
+               (plat->page_size ? 512 : 256),
+               (plat->data_width ? 16 : 8),
+               plat->wr_dly, plat->rd_dly);
+
+       val = (plat->page_size << NFC_PG_SIZE_OFFSET) |
+               (plat->data_width << NFC_NWIDTH_OFFSET) |
+               (plat->rd_dly << NFC_RDDLY_OFFSET) |
+               (plat->rd_dly << NFC_WRDLY_OFFSET);
+       dev_dbg(info->device, "NFC_CTL is 0x%04x\n", val);
+
+       bfin_write_NFC_CTL(val);
+       SSYNC();
+
+       /* clear interrupt status */
+       bfin_write_NFC_IRQMASK(0x0);
+       SSYNC();
+       val = bfin_read_NFC_IRQSTAT();
+       bfin_write_NFC_IRQSTAT(val);
+       SSYNC();
+
+       if (peripheral_request_list(bfin_nfc_pin_req, DRV_NAME)) {
+               printk(KERN_ERR DRV_NAME
+               ": Requesting Peripherals failed\n");
+               return -EFAULT;
+       }
+
+       /* DMA initialization  */
+       if (bf5xx_nand_dma_init(info))
+               err = -ENXIO;
+
+       return err;
+}
+
+/*
+ * Device management interface
+ */
+static int bf5xx_nand_add_partition(struct bf5xx_nand_info *info)
+{
+       struct mtd_info *mtd = &info->mtd;
+
+#ifdef CONFIG_MTD_PARTITIONS
+       struct mtd_partition *parts = info->platform->partitions;
+       int nr = info->platform->nr_partitions;
+
+       return add_mtd_partitions(mtd, parts, nr);
+#else
+       return add_mtd_device(mtd);
+#endif
+}
+
+static int bf5xx_nand_remove(struct platform_device *pdev)
+{
+       struct bf5xx_nand_info *info = to_nand_info(pdev);
+       struct mtd_info *mtd = NULL;
+
+       platform_set_drvdata(pdev, NULL);
+
+       /* first thing we need to do is release all our mtds
+        * and their partitions, then go through freeing the
+        * resources used
+        */
+       mtd = &info->mtd;
+       if (mtd) {
+               nand_release(mtd);
+               kfree(mtd);
+       }
+
+       peripheral_free_list(bfin_nfc_pin_req);
+
+       /* free the common resources */
+       kfree(info);
+
+       return 0;
+}
+
+/*
+ * bf5xx_nand_probe
+ *
+ * called by device layer when it finds a device matching
+ * one our driver can handled. This code checks to see if
+ * it can allocate all necessary resources then calls the
+ * nand layer to look for devices
+ */
+static int bf5xx_nand_probe(struct platform_device *pdev)
+{
+       struct bf5xx_nand_platform *plat = to_nand_plat(pdev);
+       struct bf5xx_nand_info *info = NULL;
+       struct nand_chip *chip = NULL;
+       struct mtd_info *mtd = NULL;
+       int err = 0;
+
+       dev_dbg(&pdev->dev, "(%p)\n", pdev);
+
+       if (!plat) {
+               dev_err(&pdev->dev, "no platform specific information\n");
+               goto exit_error;
+       }
+
+       info = kzalloc(sizeof(*info), GFP_KERNEL);
+       if (info == NULL) {
+               dev_err(&pdev->dev, "no memory for flash info\n");
+               err = -ENOMEM;
+               goto exit_error;
+       }
+
+       platform_set_drvdata(pdev, info);
+
+       spin_lock_init(&info->controller.lock);
+       init_waitqueue_head(&info->controller.wq);
+
+       info->device     = &pdev->dev;
+       info->platform   = plat;
+
+       /* initialise chip data struct */
+       chip = &info->chip;
+
+       if (plat->data_width)
+               chip->options |= NAND_BUSWIDTH_16;
+
+       chip->options |= NAND_CACHEPRG | NAND_SKIP_BBTSCAN;
+
+       chip->read_buf = (plat->data_width) ?
+               bf5xx_nand_read_buf16 : bf5xx_nand_read_buf;
+       chip->write_buf = (plat->data_width) ?
+               bf5xx_nand_write_buf16 : bf5xx_nand_write_buf;
+
+       chip->read_byte    = bf5xx_nand_read_byte;
+
+       chip->cmd_ctrl     = bf5xx_nand_hwcontrol;
+       chip->dev_ready    = bf5xx_nand_devready;
+
+       chip->priv         = &info->mtd;
+       chip->controller   = &info->controller;
+
+       chip->IO_ADDR_R    = (void __iomem *) NFC_READ;
+       chip->IO_ADDR_W    = (void __iomem *) NFC_DATA_WR;
+
+       chip->chip_delay   = 0;
+
+       /* initialise mtd info data struct */
+       mtd             = &info->mtd;
+       mtd->priv       = chip;
+       mtd->owner      = THIS_MODULE;
+
+       /* initialise the hardware */
+       err = bf5xx_nand_hw_init(info);
+       if (err != 0)
+               goto exit_error;
+
+       /* setup hardware ECC data struct */
+       if (hardware_ecc) {
+               if (plat->page_size == NFC_PG_SIZE_256) {
+                       chip->ecc.bytes = 3;
+                       chip->ecc.size = 256;
+               } else if (plat->page_size == NFC_PG_SIZE_512) {
+                       chip->ecc.bytes = 6;
+                       chip->ecc.size = 512;
+               }
+
+               chip->read_buf      = bf5xx_nand_dma_read_buf;
+               chip->write_buf     = bf5xx_nand_dma_write_buf;
+               chip->ecc.calculate = bf5xx_nand_calculate_ecc;
+               chip->ecc.correct   = bf5xx_nand_correct_data;
+               chip->ecc.mode      = NAND_ECC_HW;
+               chip->ecc.hwctl     = bf5xx_nand_enable_hwecc;
+       } else {
+               chip->ecc.mode      = NAND_ECC_SOFT;
+       }
+
+       /* scan hardware nand chip and setup mtd info data struct */
+       if (nand_scan(mtd, 1)) {
+               err = -ENXIO;
+               goto exit_error;
+       }
+
+       /* add NAND partition */
+       bf5xx_nand_add_partition(info);
+
+       dev_dbg(&pdev->dev, "initialised ok\n");
+       return 0;
+
+exit_error:
+       bf5xx_nand_remove(pdev);
+
+       if (err == 0)
+               err = -EINVAL;
+       return err;
+}
+
+/* PM Support */
+#ifdef CONFIG_PM
+
+static int bf5xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
+{
+       struct bf5xx_nand_info *info = platform_get_drvdata(dev);
+
+       return 0;
+}
+
+static int bf5xx_nand_resume(struct platform_device *dev)
+{
+       struct bf5xx_nand_info *info = platform_get_drvdata(dev);
+
+       if (info)
+               bf5xx_nand_hw_init(info);
+
+       return 0;
+}
+
+#else
+#define bf5xx_nand_suspend NULL
+#define bf5xx_nand_resume NULL
+#endif
+
+/* driver device registration */
+static struct platform_driver bf5xx_nand_driver = {
+       .probe          = bf5xx_nand_probe,
+       .remove         = bf5xx_nand_remove,
+       .suspend        = bf5xx_nand_suspend,
+       .resume         = bf5xx_nand_resume,
+       .driver         = {
+               .name   = DRV_NAME,
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init bf5xx_nand_init(void)
+{
+       printk(KERN_INFO "%s, Version %s (c) 2007 Analog Devices, Inc.\n",
+               DRV_DESC, DRV_VERSION);
+
+       return platform_driver_register(&bf5xx_nand_driver);
+}
+
+static void __exit bf5xx_nand_exit(void)
+{
+       platform_driver_unregister(&bf5xx_nand_driver);
+}
+
+module_init(bf5xx_nand_init);
+module_exit(bf5xx_nand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR(DRV_AUTHOR);
+MODULE_DESCRIPTION(DRV_DESC);
diff --git a/include/asm-blackfin/mach-bf548/dma.h 
b/include/asm-blackfin/mach-bf548/dma.h
index fcc8b4c..14cb10c 100644
--- a/include/asm-blackfin/mach-bf548/dma.h
+++ b/include/asm-blackfin/mach-bf548/dma.h
@@ -55,6 +55,7 @@
 #define CH_SPORT3_RX           20
 #define CH_SPORT3_TX           21
 #define CH_SDH                 22
+#define CH_NFC                 22
 #define CH_SPI2                        23
 
 #define CH_MEM_STREAM0_DEST    24
diff --git a/include/asm-blackfin/nand.h b/include/asm-blackfin/nand.h
new file mode 100644
index 0000000..afbaafa
--- /dev/null
+++ b/include/asm-blackfin/nand.h
@@ -0,0 +1,47 @@
+/* linux/include/asm-blackfin/nand.h
+ *
+ * Copyright (c) 2007 Analog Devices, Inc.
+ *     Bryan Wu <[EMAIL PROTECTED]>
+ *
+ * BF5XX - NAND flash controller platfrom_device info
+ *
+ * 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.
+ */
+
+/* struct bf5xx_nand_platform
+ *
+ * define a interface between platfrom board specific code and
+ * bf54x NFC driver.
+ *
+ * nr_partitions = number of partitions pointed to be partitoons (or zero)
+ * partitions   = mtd partition list
+ */
+
+#define NFC_PG_SIZE_256                0
+#define NFC_PG_SIZE_512                1
+#define NFC_PG_SIZE_OFFSET     9
+
+#define NFC_NWIDTH_8           0
+#define NFC_NWIDTH_16          1
+#define NFC_NWIDTH_OFFSET      8
+
+#define NFC_RDDLY_OFFSET       4
+#define NFC_WRDLY_OFFSET       0
+
+#define NFC_STAT_NBUSY         1
+
+struct bf5xx_nand_platform {
+       /* NAND chip information */
+       unsigned short          page_size;
+       unsigned short          data_width;
+
+       /* RD/WR strobe delay timing information, all times in SCLK cycles */
+       unsigned short          rd_dly;
+       unsigned short          wr_dly;
+
+       /* NAND MTD partition information */
+       int                     nr_partitions;
+       struct mtd_partition    *partitions;
+};
-
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