1 files changed, 579 insertions, 0 deletions

diff --git a/drivers/mtd/nand/bcm_umi_nand.c b/drivers/mtd/nand/bcm_umi_nand.c
new file mode 100644
index 00000000000..8c569e454dc
--- /dev/null
+++ b/drivers/mtd/nand/bcm_umi_nand.c
@@ -0,0 +1,579 @@
+/*****************************************************************************
+* Copyright 2004 - 2009 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+/* ---- Include Files ---------------------------------------------------- */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/mach-types.h>
+#include <asm/system.h>
+
+#include <mach/reg_nand.h>
+#include <mach/reg_umi.h>
+
+#include "nand_bcm_umi.h"
+
+#include <mach/memory_settings.h>
+
+#define USE_DMA 1
+#include <mach/dma.h>
+#include <linux/dma-mapping.h>
+#include <linux/completion.h>
+
+/* ---- External Variable Declarations ----------------------------------- */
+/* ---- External Function Prototypes ------------------------------------- */
+/* ---- Public Variables ------------------------------------------------- */
+/* ---- Private Constants and Types -------------------------------------- */
+static const __devinitconst char gBanner[] = KERN_INFO \
+        "BCM UMI MTD NAND Driver: 1.00\n";
+
+const char *part_probes[] = { "cmdlinepart", NULL };
+
+#if NAND_ECC_BCH
+static uint8_t scan_ff_pattern[] = { 0xff };
+
+static struct nand_bbt_descr largepage_bbt = {
+        .options = 0,
+        .offs = 0,
+        .len = 1,
+        .pattern = scan_ff_pattern
+};
+#endif
+
+/*
+** Preallocate a buffer to avoid having to do this every dma operation.
+** This is the size of the preallocated coherent DMA buffer.
+*/
+#if USE_DMA
+#define DMA_MIN_BUFLEN  512
+#define DMA_MAX_BUFLEN  PAGE_SIZE
+#define USE_DIRECT_IO(len)      (((len) < DMA_MIN_BUFLEN) || \
+        ((len) > DMA_MAX_BUFLEN))
+
+/*
+ * The current NAND data space goes from 0x80001900 to 0x80001FFF,
+ * which is only 0x700 = 1792 bytes long. This is too small for 2K, 4K page
+ * size NAND flash. Need to break the DMA down to multiple 1Ks.
+ *
+ * Need to make sure REG_NAND_DATA_PADDR + DMA_MAX_LEN < 0x80002000
+ */
+#define DMA_MAX_LEN             1024
+
+#else /* !USE_DMA */
+#define DMA_MIN_BUFLEN          0
+#define DMA_MAX_BUFLEN          0
+#define USE_DIRECT_IO(len)      1
+#endif
+/* ---- Private Function Prototypes -------------------------------------- */
+static void bcm_umi_nand_read_buf(struct mtd_info *mtd, u_char * buf, int len);
+static void bcm_umi_nand_write_buf(struct mtd_info *mtd, const u_char * buf,
+                                   int len);
+
+/* ---- Private Variables ------------------------------------------------ */
+static struct mtd_info *board_mtd;
+static void __iomem *bcm_umi_io_base;
+static void *virtPtr;
+static dma_addr_t physPtr;
+static struct completion nand_comp;
+
+/* ---- Private Functions ------------------------------------------------ */
+#if NAND_ECC_BCH
+#include "bcm_umi_bch.c"
+#else
+#include "bcm_umi_hamming.c"
+#endif
+
+#if USE_DMA
+
+/* Handler called when the DMA finishes. */
+static void nand_dma_handler(DMA_Device_t dev, int reason, void *userData)
+{
+        complete(&nand_comp);
+}
+
+static int nand_dma_init(void)
+{
+        int rc;
+
+        rc = dma_set_device_handler(DMA_DEVICE_NAND_MEM_TO_MEM,
+                nand_dma_handler, NULL);
+        if (rc != 0) {
+                printk(KERN_ERR "dma_set_device_handler failed: %d\n", rc);
+                return rc;
+        }
+
+        virtPtr =
+            dma_alloc_coherent(NULL, DMA_MAX_BUFLEN, &physPtr, GFP_KERNEL);
+        if (virtPtr == NULL) {
+                printk(KERN_ERR "NAND - Failed to allocate memory for DMA buffer\n");
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static void nand_dma_term(void)
+{
+        if (virtPtr != NULL)
+                dma_free_coherent(NULL, DMA_MAX_BUFLEN, virtPtr, physPtr);
+}
+
+static void nand_dma_read(void *buf, int len)
+{
+        int offset = 0;
+        int tmp_len = 0;
+        int len_left = len;
+        DMA_Handle_t hndl;
+
+        if (virtPtr == NULL)
+                panic("nand_dma_read: virtPtr == NULL\n");
+
+        if ((void *)physPtr == NULL)
+                panic("nand_dma_read: physPtr == NULL\n");
+
+        hndl = dma_request_channel(DMA_DEVICE_NAND_MEM_TO_MEM);
+        if (hndl < 0) {
+                printk(KERN_ERR
+                       "nand_dma_read: unable to allocate dma channel: %d\n",
+                       (int)hndl);
+                panic("\n");
+        }
+
+        while (len_left > 0) {
+                if (len_left > DMA_MAX_LEN) {
+                        tmp_len = DMA_MAX_LEN;
+                        len_left -= DMA_MAX_LEN;
+                } else {
+                        tmp_len = len_left;
+                        len_left = 0;
+                }
+
+                init_completion(&nand_comp);
+                dma_transfer_mem_to_mem(hndl, REG_NAND_DATA_PADDR,
+                                        physPtr + offset, tmp_len);
+                wait_for_completion(&nand_comp);
+
+                offset += tmp_len;
+        }
+
+        dma_free_channel(hndl);
+
+        if (buf != NULL)
+                memcpy(buf, virtPtr, len);
+}
+
+static void nand_dma_write(const void *buf, int len)
+{
+        int offset = 0;
+        int tmp_len = 0;
+        int len_left = len;
+        DMA_Handle_t hndl;
+
+        if (buf == NULL)
+                panic("nand_dma_write: buf == NULL\n");
+
+        if (virtPtr == NULL)
+                panic("nand_dma_write: virtPtr == NULL\n");
+
+        if ((void *)physPtr == NULL)
+                panic("nand_dma_write: physPtr == NULL\n");
+
+        memcpy(virtPtr, buf, len);
+
+
+        hndl = dma_request_channel(DMA_DEVICE_NAND_MEM_TO_MEM);
+        if (hndl < 0) {
+                printk(KERN_ERR
+                       "nand_dma_write: unable to allocate dma channel: %d\n",
+                       (int)hndl);
+                panic("\n");
+        }
+
+        while (len_left > 0) {
+                if (len_left > DMA_MAX_LEN) {
+                        tmp_len = DMA_MAX_LEN;
+                        len_left -= DMA_MAX_LEN;
+                } else {
+                        tmp_len = len_left;
+                        len_left = 0;
+                }
+
+                init_completion(&nand_comp);
+                dma_transfer_mem_to_mem(hndl, physPtr + offset,
+                                        REG_NAND_DATA_PADDR, tmp_len);
+                wait_for_completion(&nand_comp);
+
+                offset += tmp_len;
+        }
+
+        dma_free_channel(hndl);
+}
+
+#endif
+
+static int nand_dev_ready(struct mtd_info *mtd)
+{
+        return nand_bcm_umi_dev_ready();
+}
+
+/****************************************************************************
+*
+*  bcm_umi_nand_inithw
+*
+*   This routine does the necessary hardware (board-specific)
+*   initializations.  This includes setting up the timings, etc.
+*
+***************************************************************************/
+int bcm_umi_nand_inithw(void)
+{
+        /* Configure nand timing parameters */
+        REG_UMI_NAND_TCR &= ~0x7ffff;
+        REG_UMI_NAND_TCR |= HW_CFG_NAND_TCR;
+
+#if !defined(CONFIG_MTD_NAND_BCM_UMI_HWCS)
+        /* enable software control of CS */
+        REG_UMI_NAND_TCR |= REG_UMI_NAND_TCR_CS_SWCTRL;
+#endif
+
+        /* keep NAND chip select asserted */
+        REG_UMI_NAND_RCSR |= REG_UMI_NAND_RCSR_CS_ASSERTED;
+
+        REG_UMI_NAND_TCR &= ~REG_UMI_NAND_TCR_WORD16;
+        /* enable writes to flash */
+        REG_UMI_MMD_ICR |= REG_UMI_MMD_ICR_FLASH_WP;
+
+        writel(NAND_CMD_RESET, bcm_umi_io_base + REG_NAND_CMD_OFFSET);
+        nand_bcm_umi_wait_till_ready();
+
+#if NAND_ECC_BCH
+        nand_bcm_umi_bch_config_ecc(NAND_ECC_NUM_BYTES);
+#endif
+
+        return 0;
+}
+
+/* Used to turn latch the proper register for access. */
+static void bcm_umi_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+                                   unsigned int ctrl)
+{
+        /* send command to hardware */
+        struct nand_chip *chip = mtd->priv;
+        if (ctrl & NAND_CTRL_CHANGE) {
+                if (ctrl & NAND_CLE) {
+                        chip->IO_ADDR_W = bcm_umi_io_base + REG_NAND_CMD_OFFSET;
+                        goto CMD;
+                }
+                if (ctrl & NAND_ALE) {
+                        chip->IO_ADDR_W =
+                            bcm_umi_io_base + REG_NAND_ADDR_OFFSET;
+                        goto CMD;
+                }
+                chip->IO_ADDR_W = bcm_umi_io_base + REG_NAND_DATA8_OFFSET;
+        }
+
+CMD:
+        /* Send command to chip directly */
+        if (cmd != NAND_CMD_NONE)
+                writeb(cmd, chip->IO_ADDR_W);
+}
+
+static void bcm_umi_nand_write_buf(struct mtd_info *mtd, const u_char * buf,
+                                   int len)
+{
+        if (USE_DIRECT_IO(len)) {
+                /* Do it the old way if the buffer is small or too large.
+                 * Probably quicker than starting and checking dma. */
+                int i;
+                struct nand_chip *this = mtd->priv;
+
+                for (i = 0; i < len; i++)
+                        writeb(buf[i], this->IO_ADDR_W);
+        }
+#if USE_DMA
+        else
+                nand_dma_write(buf, len);
+#endif
+}
+
+static void bcm_umi_nand_read_buf(struct mtd_info *mtd, u_char * buf, int len)
+{
+        if (USE_DIRECT_IO(len)) {
+                int i;
+                struct nand_chip *this = mtd->priv;
+
+                for (i = 0; i < len; i++)
+                        buf[i] = readb(this->IO_ADDR_R);
+        }
+#if USE_DMA
+        else
+                nand_dma_read(buf, len);
+#endif
+}
+
+static uint8_t readbackbuf[NAND_MAX_PAGESIZE];
+static int bcm_umi_nand_verify_buf(struct mtd_info *mtd, const u_char * buf,
+                                   int len)
+{
+        /*
+         * Try to readback page with ECC correction. This is necessary
+         * for MLC parts which may have permanently stuck bits.
+         */
+        struct nand_chip *chip = mtd->priv;
+        int ret = chip->ecc.read_page(mtd, chip, readbackbuf, 0);
+        if (ret < 0)
+                return -EFAULT;
+        else {
+                if (memcmp(readbackbuf, buf, len) == 0)
+                        return 0;
+
+                return -EFAULT;
+        }
+        return 0;
+}
+
+static int __devinit bcm_umi_nand_probe(struct platform_device *pdev)
+{
+        struct nand_chip *this;
+        struct resource *r;
+        int err = 0;
+
+        printk(gBanner);
+
+        /* Allocate memory for MTD device structure and private data */
+        board_mtd =
+            kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
+                    GFP_KERNEL);
+        if (!board_mtd) {
+                printk(KERN_WARNING
+                       "Unable to allocate NAND MTD device structure.\n");
+                return -ENOMEM;
+        }
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        if (!r)
+                return -ENXIO;
+
+        /* map physical address */
+        bcm_umi_io_base = ioremap(r->start, resource_size(r));
+
+        if (!bcm_umi_io_base) {
+                printk(KERN_ERR "ioremap to access BCM UMI NAND chip failed\n");
+                kfree(board_mtd);
+                return -EIO;
+        }
+
+        /* Get pointer to private data */
+        this = (struct nand_chip *)(&board_mtd[1]);
+
+        /* Initialize structures */
+        memset((char *)board_mtd, 0, sizeof(struct mtd_info));
+        memset((char *)this, 0, sizeof(struct nand_chip));
+
+        /* Link the private data with the MTD structure */
+        board_mtd->priv = this;
+
+        /* Initialize the NAND hardware.  */
+        if (bcm_umi_nand_inithw() < 0) {
+                printk(KERN_ERR "BCM UMI NAND chip could not be initialized\n");
+                iounmap(bcm_umi_io_base);
+                kfree(board_mtd);
+                return -EIO;
+        }
+
+        /* Set address of NAND IO lines */
+        this->IO_ADDR_W = bcm_umi_io_base + REG_NAND_DATA8_OFFSET;
+        this->IO_ADDR_R = bcm_umi_io_base + REG_NAND_DATA8_OFFSET;
+
+        /* Set command delay time, see datasheet for correct value */
+        this->chip_delay = 0;
+        /* Assign the device ready function, if available */
+        this->dev_ready = nand_dev_ready;
+        this->options = 0;
+
+        this->write_buf = bcm_umi_nand_write_buf;
+        this->read_buf = bcm_umi_nand_read_buf;
+        this->verify_buf = bcm_umi_nand_verify_buf;
+
+        this->cmd_ctrl = bcm_umi_nand_hwcontrol;
+        this->ecc.mode = NAND_ECC_HW;
+        this->ecc.size = 512;
+        this->ecc.bytes = NAND_ECC_NUM_BYTES;
+#if NAND_ECC_BCH
+        this->ecc.read_page = bcm_umi_bch_read_page_hwecc;
+        this->ecc.write_page = bcm_umi_bch_write_page_hwecc;
+#else
+        this->ecc.correct = nand_correct_data512;
+        this->ecc.calculate = bcm_umi_hamming_get_hw_ecc;
+        this->ecc.hwctl = bcm_umi_hamming_enable_hwecc;
+#endif
+
+#if USE_DMA
+        err = nand_dma_init();
+        if (err != 0)
+                return err;
+#endif
+
+        /* Figure out the size of the device that we have.
+         * We need to do this to figure out which ECC
+         * layout we'll be using.
+         */
+
+        err = nand_scan_ident(board_mtd, 1, NULL);
+        if (err) {
+                printk(KERN_ERR "nand_scan failed: %d\n", err);
+                iounmap(bcm_umi_io_base);
+                kfree(board_mtd);
+                return err;
+        }
+
+        /* Now that we know the nand size, we can setup the ECC layout */
+
+        switch (board_mtd->writesize) { /* writesize is the pagesize */
+        case 4096:
+                this->ecc.layout = &nand_hw_eccoob_4096;
+                break;
+        case 2048:
+                this->ecc.layout = &nand_hw_eccoob_2048;
+                break;
+        case 512:
+                this->ecc.layout = &nand_hw_eccoob_512;
+                break;
+        default:
+                {
+                        printk(KERN_ERR "NAND - Unrecognized pagesize: %d\n",
+                                         board_mtd->writesize);
+                        return -EINVAL;
+                }
+        }
+
+#if NAND_ECC_BCH
+        if (board_mtd->writesize > 512) {
+                if (this->options & NAND_USE_FLASH_BBT)
+                        largepage_bbt.options = NAND_BBT_SCAN2NDPAGE;
+                this->badblock_pattern = &largepage_bbt;
+        }
+#endif
+
+        /* Now finish off the scan, now that ecc.layout has been initialized. */
+
+        err = nand_scan_tail(board_mtd);
+        if (err) {
+                printk(KERN_ERR "nand_scan failed: %d\n", err);
+                iounmap(bcm_umi_io_base);
+                kfree(board_mtd);
+                return err;
+        }
+
+        /* Register the partitions */
+        {
+                int nr_partitions;
+                struct mtd_partition *partition_info;
+
+                board_mtd->name = "bcm_umi-nand";
+                nr_partitions =
+                    parse_mtd_partitions(board_mtd, part_probes,
+                                         &partition_info, 0);
+
+                if (nr_partitions <= 0) {
+                        printk(KERN_ERR "BCM UMI NAND: Too few partitions - %d\n",
+                               nr_partitions);
+                        iounmap(bcm_umi_io_base);
+                        kfree(board_mtd);
+                        return -EIO;
+                }
+                mtd_device_register(board_mtd, partition_info, nr_partitions);
+        }
+
+        /* Return happy */
+        return 0;
+}
+
+static int bcm_umi_nand_remove(struct platform_device *pdev)
+{
+#if USE_DMA
+        nand_dma_term();
+#endif
+
+        /* Release resources, unregister device */
+        nand_release(board_mtd);
+
+        /* unmap physical address */
+        iounmap(bcm_umi_io_base);
+
+        /* Free the MTD device structure */
+        kfree(board_mtd);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int bcm_umi_nand_suspend(struct platform_device *pdev,
+                                pm_message_t state)
+{
+        printk(KERN_ERR "MTD NAND suspend is being called\n");
+        return 0;
+}
+
+static int bcm_umi_nand_resume(struct platform_device *pdev)
+{
+        printk(KERN_ERR "MTD NAND resume is being called\n");
+        return 0;
+}
+#else
+#define bcm_umi_nand_suspend   NULL
+#define bcm_umi_nand_resume    NULL
+#endif
+
+static struct platform_driver nand_driver = {
+        .driver = {
+                   .name = "bcm-nand",
+                   .owner = THIS_MODULE,
+                   },
+        .probe = bcm_umi_nand_probe,
+        .remove = bcm_umi_nand_remove,
+        .suspend = bcm_umi_nand_suspend,
+        .resume = bcm_umi_nand_resume,
+};
+
+static int __init nand_init(void)
+{
+        return platform_driver_register(&nand_driver);
+}
+
+static void __exit nand_exit(void)
+{
+        platform_driver_unregister(&nand_driver);
+}
+
+module_init(nand_init);
+module_exit(nand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("BCM UMI MTD NAND driver");