[MTD] NAND: CAFÉ NAND driver cleanup, fix ECC on reading empty flash
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse
parent
04459d7c62
commit
fbad5696c5
3 changed files with 109 additions and 48 deletions
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@ -25,4 +25,5 @@ obj-$(CONFIG_MTD_NAND_CS553X) += cs553x_nand.o
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obj-$(CONFIG_MTD_NAND_NDFC) += ndfc.o
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obj-$(CONFIG_MTD_NAND_AT91) += at91_nand.o
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nand-objs = nand_base.o nand_bbt.o
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nand-objs := nand_base.o nand_bbt.o
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cafe_nand-objs := cafe.o cafe_ecc.o
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@ -1,5 +1,5 @@
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/*
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* cafe_nand.c
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* Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
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*
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* Copyright © 2006 Red Hat, Inc.
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* Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
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@ -30,13 +30,13 @@
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#define CAFE_NAND_TIMING3 0x2c
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#define CAFE_NAND_NONMEM 0x30
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#define CAFE_NAND_ECC_RESULT 0x3C
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#define CAFE_NAND_DMA_CTRL 0x40
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#define CAFE_NAND_DMA_ADDR0 0x44
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#define CAFE_NAND_DMA_ADDR1 0x48
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#define CAFE_NAND_ECC_SYN01 0x50
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#define CAFE_NAND_ECC_SYN23 0x54
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#define CAFE_NAND_ECC_SYN45 0x58
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#define CAFE_NAND_ECC_SYN67 0x5c
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#define CAFE_NAND_DMA_CTRL 0x40
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#define CAFE_NAND_DMA_ADDR0 0x44
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#define CAFE_NAND_DMA_ADDR1 0x48
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#define CAFE_NAND_READ_DATA 0x1000
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#define CAFE_NAND_WRITE_DATA 0x2000
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@ -75,12 +75,14 @@ static int cafe_device_ready(struct mtd_info *mtd)
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{
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struct cafe_priv *cafe = mtd->priv;
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int result = !!(readl(cafe->mmio + CAFE_NAND_STATUS) | 0x40000000);
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uint32_t irqs = readl(cafe->mmio + CAFE_NAND_IRQ);
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writel(irqs, cafe->mmio+CAFE_NAND_IRQ);
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cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
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result?"":" not", irqs, readl(cafe->mmio + CAFE_NAND_IRQ),
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readl(cafe->mmio + 0x3008), readl(cafe->mmio + 0x300c));
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return result;
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}
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@ -93,6 +95,7 @@ static void cafe_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
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memcpy(cafe->dmabuf + cafe->datalen, buf, len);
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else
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memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
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cafe->datalen += len;
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cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
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@ -131,14 +134,13 @@ static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
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int adrbytes = 0;
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uint32_t ctl1;
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uint32_t doneint = 0x80000000;
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int i;
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cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
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command, column, page_addr);
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if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
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/* Second half of a command we already calculated */
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writel(cafe->ctl2 | 0x100 | command, cafe->mmio + 0x04);
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writel(cafe->ctl2 | 0x100 | command, cafe->mmio + CAFE_NAND_CTRL2);
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ctl1 = cafe->ctl1;
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cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
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cafe->ctl1, cafe->nr_data);
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@ -158,12 +160,12 @@ static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
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for small-page chips, to position the buffer correctly? */
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if (column != -1) {
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writel(column, cafe->mmio + 0x1c);
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writel(column, cafe->mmio + CAFE_NAND_ADDR1);
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adrbytes = 2;
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if (page_addr != -1)
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goto write_adr2;
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} else if (page_addr != -1) {
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writel(page_addr & 0xffff, cafe->mmio + 0x1c);
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writel(page_addr & 0xffff, cafe->mmio + CAFE_NAND_ADDR1);
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page_addr >>= 16;
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write_adr2:
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writel(page_addr, cafe->mmio+0x20);
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@ -212,13 +214,15 @@ static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
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writel(cafe->ctl2 | 0x100 | NAND_CMD_READSTART, cafe->mmio + CAFE_NAND_CTRL2);
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do_command:
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#if 0
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// ECC on read only works if we ...
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#if 1
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/* http://dev.laptop.org/ticket/200
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ECC on read only works if we read precisely 0x80e bytes */
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if (cafe->datalen == 2112)
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cafe->datalen = 2062;
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#endif
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cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
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cafe->datalen, ctl1, readl(cafe->mmio+CAFE_NAND_CTRL2));
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/* NB: The datasheet lies -- we really should be subtracting 1 here */
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writel(cafe->datalen, cafe->mmio + CAFE_NAND_DATA_LEN);
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writel(0x90000000, cafe->mmio + CAFE_NAND_IRQ);
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@ -232,18 +236,16 @@ static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
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the command. */
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doneint = 0x10000000;
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}
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writel(dmactl, cafe->mmio + 0x40);
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writel(dmactl, cafe->mmio + CAFE_NAND_DMA_CTRL);
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}
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#if 0
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printk("DMA setup is %x, status %x, ctl1 %x\n", readl(cafe->mmio + 0x40), readl(cafe->mmio + 0x0c), readl(cafe->mmio));
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printk("DMA setup is %x, status %x, ctl1 %x\n", readl(cafe->mmio + 0x40), readl(cafe->mmio + 0x0c), readl(cafe->mmio));
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#endif
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cafe->datalen = 0;
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#if 0
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{ int i;
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printk("About to write command %08x\n", ctl1);
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for (i=0; i< 0x5c; i+=4)
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printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
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}
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#endif
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writel(ctl1, cafe->mmio + CAFE_NAND_CTRL1);
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/* Apply this short delay always to ensure that we do wait tWB in
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@ -299,6 +301,7 @@ static void cafe_select_chip(struct mtd_info *mtd, int chipnr)
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//struct cafe_priv *cafe = mtd->priv;
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// cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
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}
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static int cafe_nand_interrupt(int irq, void *id, struct pt_regs *regs)
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{
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struct mtd_info *mtd = id;
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@ -347,14 +350,34 @@ static int cafe_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
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* The hw generator calculates the error syndrome automatically. Therefor
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* we need a special oob layout and handling.
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*/
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static unsigned short cafe_empty_syndromes[8] = { 4095, 748, 2629, 2920, 875, 1454, 51, 1456 };
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static int is_all_ff(unsigned char *buf, int len)
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{
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unsigned long *lbuf = (void *)buf;
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int i;
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for (i=0; i < (len/sizeof(long)); i++) {
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if (lbuf[i] != ~0UL)
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return 0;
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}
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i *= sizeof(long);
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for (; i< len; i++) {
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if (buf[i] != 0xff)
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return 0;
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}
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return 1;
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}
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static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
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uint8_t *buf)
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{
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struct cafe_priv *cafe = mtd->priv;
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dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
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readl(cafe->mmio + CAFE_NAND_ECC_RESULT),
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readl(cafe->mmio + CAFE_NAND_ECC_SYN01));
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cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
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readl(cafe->mmio + CAFE_NAND_ECC_RESULT),
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readl(cafe->mmio + CAFE_NAND_ECC_SYN01));
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chip->read_buf(mtd, buf, mtd->writesize);
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chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
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@ -369,7 +392,13 @@ static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
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syn[i+1] = (tmp >> 16) & 0xfff;
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}
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if ((i = cafe_correct_ecc(buf, syn)) < 0) {
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/* FIXME: http://dev.laptop.org/ticket/215 */
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if (!memcmp(syn, cafe_empty_syndromes, sizeof(syn))
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&& is_all_ff(chip->oob_poi, 14)
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&& is_all_ff(buf, mtd->writesize)) {
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dev_dbg(&cafe->pdev->dev, "ECC error reported on empty block\n");
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/* It was an empty block. Nothing to fix here except the hardware */
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} else if ((i = cafe_correct_ecc(buf, syn)) < 0) {
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dev_dbg(&cafe->pdev->dev, "Failed to correct ECC\n");
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mtd->ecc_stats.failed++;
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} else {
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@ -389,9 +418,13 @@ static struct nand_ecclayout cafe_oobinfo_2048 = {
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};
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/* Ick. The BBT code really ought to be able to work this bit out
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for itself from the above */
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static uint8_t cafe_bbt_pattern[] = {'B', 'b', 't', '0' };
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static uint8_t cafe_mirror_pattern[] = {'1', 't', 'b', 'B' };
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for itself from the above, at least for the 2KiB case */
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static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
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static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
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static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
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static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
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static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
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.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
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@ -400,7 +433,7 @@ static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
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.len = 4,
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.veroffs = 18,
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.maxblocks = 4,
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.pattern = cafe_bbt_pattern
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.pattern = cafe_bbt_pattern_2048
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};
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static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
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@ -410,7 +443,7 @@ static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
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.len = 4,
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.veroffs = 18,
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.maxblocks = 4,
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.pattern = cafe_mirror_pattern
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.pattern = cafe_mirror_pattern_2048
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};
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static struct nand_ecclayout cafe_oobinfo_512 = {
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@ -419,6 +452,27 @@ static struct nand_ecclayout cafe_oobinfo_512 = {
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.oobfree = {{14, 2}}
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};
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static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
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.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
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| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
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.offs = 14,
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.len = 1,
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.veroffs = 15,
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.maxblocks = 4,
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.pattern = cafe_bbt_pattern_512
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};
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static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
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.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
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| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
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.offs = 14,
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.len = 1,
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.veroffs = 15,
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.maxblocks = 4,
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.pattern = cafe_mirror_pattern_512
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};
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static void cafe_nand_write_page_lowlevel(struct mtd_info *mtd,
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struct nand_chip *chip, const uint8_t *buf)
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{
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@ -566,19 +620,21 @@ static int __devinit cafe_nand_probe(struct pci_dev *pdev,
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ctrl |= 0x00007000;
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writel(ctrl | 0x05, cafe->mmio + 0x3004);
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writel(ctrl | 0x0a, cafe->mmio + 0x3004);
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writel(0, cafe->mmio + 0x40);
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writel(0, cafe->mmio + CAFE_NAND_DMA_CTRL);
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writel(0x7006, cafe->mmio + 0x3004);
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writel(0x700a, cafe->mmio + 0x3004);
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/* Set up DMA address */
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writel(cafe->dmaaddr & 0xffffffff, cafe->mmio + 0x44);
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writel(cafe->dmaaddr & 0xffffffff, cafe->mmio + CAFE_NAND_DMA_ADDR0);
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if (sizeof(cafe->dmaaddr) > 4)
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writel((cafe->dmaaddr >> 16) >> 16, cafe->mmio + 0x48);
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/* Shift in two parts to shut the compiler up */
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writel((cafe->dmaaddr >> 16) >> 16, cafe->mmio + CAFE_NAND_DMA_ADDR1);
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else
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writel(0, cafe->mmio + 0x48);
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writel(0, cafe->mmio + CAFE_NAND_DMA_ADDR1);
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cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
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readl(cafe->mmio+0x44), cafe->dmabuf);
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readl(cafe->mmio + CAFE_NAND_DMA_ADDR0), cafe->dmabuf);
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/* Enable NAND IRQ in global IRQ mask register */
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writel(0x80000007, cafe->mmio + 0x300c);
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@ -620,27 +676,30 @@ static int __devinit cafe_nand_probe(struct pci_dev *pdev,
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cafe->ctl2 |= 1<<29; /* 2KiB page size */
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/* Set up ECC according to the type of chip we found */
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if (mtd->writesize == 512 || mtd->writesize == 2048) {
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cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
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cafe->nand.ecc.size = mtd->writesize;
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cafe->nand.ecc.bytes = 14;
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if (mtd->writesize == 2048) {
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cafe->nand.ecc.layout = &cafe_oobinfo_2048;
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cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
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cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
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cafe->nand.ecc.hwctl = (void *)cafe_nand_bug;
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cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
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cafe->nand.ecc.correct = (void *)cafe_nand_bug;
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cafe->nand.write_page = cafe_nand_write_page;
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cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
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cafe->nand.ecc.write_oob = cafe_nand_write_oob;
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cafe->nand.ecc.read_page = cafe_nand_read_page;
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cafe->nand.ecc.read_oob = cafe_nand_read_oob;
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} else if (mtd->writesize == 512) {
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cafe->nand.ecc.layout = &cafe_oobinfo_512;
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cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
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cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
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} else {
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printk(KERN_WARNING "Unexpected NAND flash writesize %d. Using software ECC\n",
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printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n",
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mtd->writesize);
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cafe->nand.ecc.mode = NAND_ECC_NONE;
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goto out_irq;
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}
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cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
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cafe->nand.ecc.size = mtd->writesize;
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cafe->nand.ecc.bytes = 14;
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cafe->nand.ecc.hwctl = (void *)cafe_nand_bug;
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cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
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cafe->nand.ecc.correct = (void *)cafe_nand_bug;
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cafe->nand.write_page = cafe_nand_write_page;
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cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
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cafe->nand.ecc.write_oob = cafe_nand_write_oob;
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cafe->nand.ecc.read_page = cafe_nand_read_page;
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cafe->nand.ecc.read_oob = cafe_nand_read_oob;
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err = nand_scan_tail(mtd);
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if (err)
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@ -499,10 +499,11 @@ static void solve_2x3(unsigned short m[2][3], unsigned short *coefs)
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}
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static unsigned char gf64_inv[64] = {
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0, 1, 33, 62, 49, 43, 31, 44, 57, 37, 52, 28, 46, 40, 22, 25,
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0, 1, 33, 62, 49, 43, 31, 44, 57, 37, 52, 28, 46, 40, 22, 25,
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61, 54, 51, 39, 26, 35, 14, 24, 23, 15, 20, 34, 11, 53, 45, 6,
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63, 2, 27, 21, 56, 9, 50, 19, 13, 47, 48, 5, 7, 30, 12, 41,
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42, 4, 38, 18, 10, 29, 17, 60, 36, 8, 59, 58, 55, 16, 3, 32};
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42, 4, 38, 18, 10, 29, 17, 60, 36, 8, 59, 58, 55, 16, 3, 32
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};
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static unsigned short gf4096_inv(unsigned short din)
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{
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