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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/mtd/nand/raw/cafe_nand.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mtd/nand/raw/cafe_nand.c')
-rw-r--r--drivers/mtd/nand/raw/cafe_nand.c892
1 files changed, 892 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/cafe_nand.c b/drivers/mtd/nand/raw/cafe_nand.c
new file mode 100644
index 000000000..66385c4fb
--- /dev/null
+++ b/drivers/mtd/nand/raw/cafe_nand.c
@@ -0,0 +1,892 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
+ *
+ * The data sheet for this device can be found at:
+ * http://wiki.laptop.org/go/Datasheets
+ *
+ * Copyright © 2006 Red Hat, Inc.
+ * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
+ */
+
+#define DEBUG
+
+#include <linux/device.h>
+#undef DEBUG
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/rslib.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <asm/io.h>
+
+#define CAFE_NAND_CTRL1 0x00
+#define CAFE_NAND_CTRL2 0x04
+#define CAFE_NAND_CTRL3 0x08
+#define CAFE_NAND_STATUS 0x0c
+#define CAFE_NAND_IRQ 0x10
+#define CAFE_NAND_IRQ_MASK 0x14
+#define CAFE_NAND_DATA_LEN 0x18
+#define CAFE_NAND_ADDR1 0x1c
+#define CAFE_NAND_ADDR2 0x20
+#define CAFE_NAND_TIMING1 0x24
+#define CAFE_NAND_TIMING2 0x28
+#define CAFE_NAND_TIMING3 0x2c
+#define CAFE_NAND_NONMEM 0x30
+#define CAFE_NAND_ECC_RESULT 0x3C
+#define CAFE_NAND_DMA_CTRL 0x40
+#define CAFE_NAND_DMA_ADDR0 0x44
+#define CAFE_NAND_DMA_ADDR1 0x48
+#define CAFE_NAND_ECC_SYN01 0x50
+#define CAFE_NAND_ECC_SYN23 0x54
+#define CAFE_NAND_ECC_SYN45 0x58
+#define CAFE_NAND_ECC_SYN67 0x5c
+#define CAFE_NAND_READ_DATA 0x1000
+#define CAFE_NAND_WRITE_DATA 0x2000
+
+#define CAFE_GLOBAL_CTRL 0x3004
+#define CAFE_GLOBAL_IRQ 0x3008
+#define CAFE_GLOBAL_IRQ_MASK 0x300c
+#define CAFE_NAND_RESET 0x3034
+
+/* Missing from the datasheet: bit 19 of CTRL1 sets CE0 vs. CE1 */
+#define CTRL1_CHIPSELECT (1<<19)
+
+struct cafe_priv {
+ struct nand_chip nand;
+ struct pci_dev *pdev;
+ void __iomem *mmio;
+ struct rs_control *rs;
+ uint32_t ctl1;
+ uint32_t ctl2;
+ int datalen;
+ int nr_data;
+ int data_pos;
+ int page_addr;
+ bool usedma;
+ dma_addr_t dmaaddr;
+ unsigned char *dmabuf;
+};
+
+static int usedma = 1;
+module_param(usedma, int, 0644);
+
+static int skipbbt = 0;
+module_param(skipbbt, int, 0644);
+
+static int debug = 0;
+module_param(debug, int, 0644);
+
+static int regdebug = 0;
+module_param(regdebug, int, 0644);
+
+static int checkecc = 1;
+module_param(checkecc, int, 0644);
+
+static unsigned int numtimings;
+static int timing[3];
+module_param_array(timing, int, &numtimings, 0644);
+
+static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
+
+/* Hrm. Why isn't this already conditional on something in the struct device? */
+#define cafe_dev_dbg(dev, args...) do { if (debug) dev_dbg(dev, ##args); } while(0)
+
+/* Make it easier to switch to PIO if we need to */
+#define cafe_readl(cafe, addr) readl((cafe)->mmio + CAFE_##addr)
+#define cafe_writel(cafe, datum, addr) writel(datum, (cafe)->mmio + CAFE_##addr)
+
+static int cafe_device_ready(struct nand_chip *chip)
+{
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ int result = !!(cafe_readl(cafe, NAND_STATUS) & 0x40000000);
+ uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
+
+ cafe_writel(cafe, irqs, NAND_IRQ);
+
+ cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
+ result?"":" not", irqs, cafe_readl(cafe, NAND_IRQ),
+ cafe_readl(cafe, GLOBAL_IRQ), cafe_readl(cafe, GLOBAL_IRQ_MASK));
+
+ return result;
+}
+
+
+static void cafe_write_buf(struct nand_chip *chip, const uint8_t *buf, int len)
+{
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+
+ if (cafe->usedma)
+ memcpy(cafe->dmabuf + cafe->datalen, buf, len);
+ else
+ memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
+
+ cafe->datalen += len;
+
+ cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
+ len, cafe->datalen);
+}
+
+static void cafe_read_buf(struct nand_chip *chip, uint8_t *buf, int len)
+{
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+
+ if (cafe->usedma)
+ memcpy(buf, cafe->dmabuf + cafe->datalen, len);
+ else
+ memcpy_fromio(buf, cafe->mmio + CAFE_NAND_READ_DATA + cafe->datalen, len);
+
+ cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes from position 0x%x in read buffer.\n",
+ len, cafe->datalen);
+ cafe->datalen += len;
+}
+
+static uint8_t cafe_read_byte(struct nand_chip *chip)
+{
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ uint8_t d;
+
+ cafe_read_buf(chip, &d, 1);
+ cafe_dev_dbg(&cafe->pdev->dev, "Read %02x\n", d);
+
+ return d;
+}
+
+static void cafe_nand_cmdfunc(struct nand_chip *chip, unsigned command,
+ int column, int page_addr)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ int adrbytes = 0;
+ uint32_t ctl1;
+ uint32_t doneint = 0x80000000;
+
+ cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
+ command, column, page_addr);
+
+ if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
+ /* Second half of a command we already calculated */
+ cafe_writel(cafe, cafe->ctl2 | 0x100 | command, NAND_CTRL2);
+ ctl1 = cafe->ctl1;
+ cafe->ctl2 &= ~(1<<30);
+ cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
+ cafe->ctl1, cafe->nr_data);
+ goto do_command;
+ }
+ /* Reset ECC engine */
+ cafe_writel(cafe, 0, NAND_CTRL2);
+
+ /* Emulate NAND_CMD_READOOB on large-page chips */
+ if (mtd->writesize > 512 &&
+ command == NAND_CMD_READOOB) {
+ column += mtd->writesize;
+ command = NAND_CMD_READ0;
+ }
+
+ /* FIXME: Do we need to send read command before sending data
+ for small-page chips, to position the buffer correctly? */
+
+ if (column != -1) {
+ cafe_writel(cafe, column, NAND_ADDR1);
+ adrbytes = 2;
+ if (page_addr != -1)
+ goto write_adr2;
+ } else if (page_addr != -1) {
+ cafe_writel(cafe, page_addr & 0xffff, NAND_ADDR1);
+ page_addr >>= 16;
+ write_adr2:
+ cafe_writel(cafe, page_addr, NAND_ADDR2);
+ adrbytes += 2;
+ if (mtd->size > mtd->writesize << 16)
+ adrbytes++;
+ }
+
+ cafe->data_pos = cafe->datalen = 0;
+
+ /* Set command valid bit, mask in the chip select bit */
+ ctl1 = 0x80000000 | command | (cafe->ctl1 & CTRL1_CHIPSELECT);
+
+ /* Set RD or WR bits as appropriate */
+ if (command == NAND_CMD_READID || command == NAND_CMD_STATUS) {
+ ctl1 |= (1<<26); /* rd */
+ /* Always 5 bytes, for now */
+ cafe->datalen = 4;
+ /* And one address cycle -- even for STATUS, since the controller doesn't work without */
+ adrbytes = 1;
+ } else if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
+ command == NAND_CMD_READOOB || command == NAND_CMD_RNDOUT) {
+ ctl1 |= 1<<26; /* rd */
+ /* For now, assume just read to end of page */
+ cafe->datalen = mtd->writesize + mtd->oobsize - column;
+ } else if (command == NAND_CMD_SEQIN)
+ ctl1 |= 1<<25; /* wr */
+
+ /* Set number of address bytes */
+ if (adrbytes)
+ ctl1 |= ((adrbytes-1)|8) << 27;
+
+ if (command == NAND_CMD_SEQIN || command == NAND_CMD_ERASE1) {
+ /* Ignore the first command of a pair; the hardware
+ deals with them both at once, later */
+ cafe->ctl1 = ctl1;
+ cafe_dev_dbg(&cafe->pdev->dev, "Setup for delayed command, ctl1 %08x, dlen %x\n",
+ cafe->ctl1, cafe->datalen);
+ return;
+ }
+ /* RNDOUT and READ0 commands need a following byte */
+ if (command == NAND_CMD_RNDOUT)
+ cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_RNDOUTSTART, NAND_CTRL2);
+ else if (command == NAND_CMD_READ0 && mtd->writesize > 512)
+ cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_READSTART, NAND_CTRL2);
+
+ do_command:
+ cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
+ cafe->datalen, ctl1, cafe_readl(cafe, NAND_CTRL2));
+
+ /* NB: The datasheet lies -- we really should be subtracting 1 here */
+ cafe_writel(cafe, cafe->datalen, NAND_DATA_LEN);
+ cafe_writel(cafe, 0x90000000, NAND_IRQ);
+ if (cafe->usedma && (ctl1 & (3<<25))) {
+ uint32_t dmactl = 0xc0000000 + cafe->datalen;
+ /* If WR or RD bits set, set up DMA */
+ if (ctl1 & (1<<26)) {
+ /* It's a read */
+ dmactl |= (1<<29);
+ /* ... so it's done when the DMA is done, not just
+ the command. */
+ doneint = 0x10000000;
+ }
+ cafe_writel(cafe, dmactl, NAND_DMA_CTRL);
+ }
+ cafe->datalen = 0;
+
+ if (unlikely(regdebug)) {
+ int i;
+ printk("About to write command %08x to register 0\n", ctl1);
+ for (i=4; i< 0x5c; i+=4)
+ printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
+ }
+
+ cafe_writel(cafe, ctl1, NAND_CTRL1);
+ /* Apply this short delay always to ensure that we do wait tWB in
+ * any case on any machine. */
+ ndelay(100);
+
+ if (1) {
+ int c;
+ uint32_t irqs;
+
+ for (c = 500000; c != 0; c--) {
+ irqs = cafe_readl(cafe, NAND_IRQ);
+ if (irqs & doneint)
+ break;
+ udelay(1);
+ if (!(c % 100000))
+ cafe_dev_dbg(&cafe->pdev->dev, "Wait for ready, IRQ %x\n", irqs);
+ cpu_relax();
+ }
+ cafe_writel(cafe, doneint, NAND_IRQ);
+ cafe_dev_dbg(&cafe->pdev->dev, "Command %x completed after %d usec, irqs %x (%x)\n",
+ command, 500000-c, irqs, cafe_readl(cafe, NAND_IRQ));
+ }
+
+ WARN_ON(cafe->ctl2 & (1<<30));
+
+ switch (command) {
+
+ case NAND_CMD_CACHEDPROG:
+ case NAND_CMD_PAGEPROG:
+ case NAND_CMD_ERASE1:
+ case NAND_CMD_ERASE2:
+ case NAND_CMD_SEQIN:
+ case NAND_CMD_RNDIN:
+ case NAND_CMD_STATUS:
+ case NAND_CMD_RNDOUT:
+ cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
+ return;
+ }
+ nand_wait_ready(chip);
+ cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
+}
+
+static void cafe_select_chip(struct nand_chip *chip, int chipnr)
+{
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+
+ cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
+
+ /* Mask the appropriate bit into the stored value of ctl1
+ which will be used by cafe_nand_cmdfunc() */
+ if (chipnr)
+ cafe->ctl1 |= CTRL1_CHIPSELECT;
+ else
+ cafe->ctl1 &= ~CTRL1_CHIPSELECT;
+}
+
+static irqreturn_t cafe_nand_interrupt(int irq, void *id)
+{
+ struct mtd_info *mtd = id;
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
+ cafe_writel(cafe, irqs & ~0x90000000, NAND_IRQ);
+ if (!irqs)
+ return IRQ_NONE;
+
+ cafe_dev_dbg(&cafe->pdev->dev, "irq, bits %x (%x)\n", irqs, cafe_readl(cafe, NAND_IRQ));
+ return IRQ_HANDLED;
+}
+
+static int cafe_nand_write_oob(struct nand_chip *chip, int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ return nand_prog_page_op(chip, page, mtd->writesize, chip->oob_poi,
+ mtd->oobsize);
+}
+
+/* Don't use -- use nand_read_oob_std for now */
+static int cafe_nand_read_oob(struct nand_chip *chip, int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ return nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);
+}
+/**
+ * cafe_nand_read_page - [REPLACEABLE] hardware ecc syndrome based page read
+ * @chip: nand chip info structure
+ * @buf: buffer to store read data
+ * @oob_required: caller expects OOB data read to chip->oob_poi
+ * @page: page number to read
+ *
+ * The hw generator calculates the error syndrome automatically. Therefore
+ * we need a special oob layout and handling.
+ */
+static int cafe_nand_read_page(struct nand_chip *chip, uint8_t *buf,
+ int oob_required, int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ unsigned int max_bitflips = 0;
+
+ cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
+ cafe_readl(cafe, NAND_ECC_RESULT),
+ cafe_readl(cafe, NAND_ECC_SYN01));
+
+ nand_read_page_op(chip, page, 0, buf, mtd->writesize);
+ chip->legacy.read_buf(chip, chip->oob_poi, mtd->oobsize);
+
+ if (checkecc && cafe_readl(cafe, NAND_ECC_RESULT) & (1<<18)) {
+ unsigned short syn[8], pat[4];
+ int pos[4];
+ u8 *oob = chip->oob_poi;
+ int i, n;
+
+ for (i=0; i<8; i+=2) {
+ uint32_t tmp = cafe_readl(cafe, NAND_ECC_SYN01 + (i*2));
+
+ syn[i] = cafe->rs->codec->index_of[tmp & 0xfff];
+ syn[i+1] = cafe->rs->codec->index_of[(tmp >> 16) & 0xfff];
+ }
+
+ n = decode_rs16(cafe->rs, NULL, NULL, 1367, syn, 0, pos, 0,
+ pat);
+
+ for (i = 0; i < n; i++) {
+ int p = pos[i];
+
+ /* The 12-bit symbols are mapped to bytes here */
+
+ if (p > 1374) {
+ /* out of range */
+ n = -1374;
+ } else if (p == 0) {
+ /* high four bits do not correspond to data */
+ if (pat[i] > 0xff)
+ n = -2048;
+ else
+ buf[0] ^= pat[i];
+ } else if (p == 1365) {
+ buf[2047] ^= pat[i] >> 4;
+ oob[0] ^= pat[i] << 4;
+ } else if (p > 1365) {
+ if ((p & 1) == 1) {
+ oob[3*p/2 - 2048] ^= pat[i] >> 4;
+ oob[3*p/2 - 2047] ^= pat[i] << 4;
+ } else {
+ oob[3*p/2 - 2049] ^= pat[i] >> 8;
+ oob[3*p/2 - 2048] ^= pat[i];
+ }
+ } else if ((p & 1) == 1) {
+ buf[3*p/2] ^= pat[i] >> 4;
+ buf[3*p/2 + 1] ^= pat[i] << 4;
+ } else {
+ buf[3*p/2 - 1] ^= pat[i] >> 8;
+ buf[3*p/2] ^= pat[i];
+ }
+ }
+
+ if (n < 0) {
+ dev_dbg(&cafe->pdev->dev, "Failed to correct ECC at %08x\n",
+ cafe_readl(cafe, NAND_ADDR2) * 2048);
+ for (i = 0; i < 0x5c; i += 4)
+ printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
+ mtd->ecc_stats.failed++;
+ } else {
+ dev_dbg(&cafe->pdev->dev, "Corrected %d symbol errors\n", n);
+ mtd->ecc_stats.corrected += n;
+ max_bitflips = max_t(unsigned int, max_bitflips, n);
+ }
+ }
+
+ return max_bitflips;
+}
+
+static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section)
+ return -ERANGE;
+
+ oobregion->offset = 0;
+ oobregion->length = chip->ecc.total;
+
+ return 0;
+}
+
+static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section)
+ return -ERANGE;
+
+ oobregion->offset = chip->ecc.total;
+ oobregion->length = mtd->oobsize - chip->ecc.total;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
+ .ecc = cafe_ooblayout_ecc,
+ .free = cafe_ooblayout_free,
+};
+
+/* Ick. The BBT code really ought to be able to work this bit out
+ for itself from the above, at least for the 2KiB case */
+static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
+static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
+
+static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
+static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
+
+
+static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION,
+ .offs = 14,
+ .len = 4,
+ .veroffs = 18,
+ .maxblocks = 4,
+ .pattern = cafe_bbt_pattern_2048
+};
+
+static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION,
+ .offs = 14,
+ .len = 4,
+ .veroffs = 18,
+ .maxblocks = 4,
+ .pattern = cafe_mirror_pattern_2048
+};
+
+static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION,
+ .offs = 14,
+ .len = 1,
+ .veroffs = 15,
+ .maxblocks = 4,
+ .pattern = cafe_bbt_pattern_512
+};
+
+static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION,
+ .offs = 14,
+ .len = 1,
+ .veroffs = 15,
+ .maxblocks = 4,
+ .pattern = cafe_mirror_pattern_512
+};
+
+
+static int cafe_nand_write_page_lowlevel(struct nand_chip *chip,
+ const uint8_t *buf, int oob_required,
+ int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+
+ nand_prog_page_begin_op(chip, page, 0, buf, mtd->writesize);
+ chip->legacy.write_buf(chip, chip->oob_poi, mtd->oobsize);
+
+ /* Set up ECC autogeneration */
+ cafe->ctl2 |= (1<<30);
+
+ return nand_prog_page_end_op(chip);
+}
+
+/* F_2[X]/(X**6+X+1) */
+static unsigned short gf64_mul(u8 a, u8 b)
+{
+ u8 c;
+ unsigned int i;
+
+ c = 0;
+ for (i = 0; i < 6; i++) {
+ if (a & 1)
+ c ^= b;
+ a >>= 1;
+ b <<= 1;
+ if ((b & 0x40) != 0)
+ b ^= 0x43;
+ }
+
+ return c;
+}
+
+/* F_64[X]/(X**2+X+A**-1) with A the generator of F_64[X] */
+static u16 gf4096_mul(u16 a, u16 b)
+{
+ u8 ah, al, bh, bl, ch, cl;
+
+ ah = a >> 6;
+ al = a & 0x3f;
+ bh = b >> 6;
+ bl = b & 0x3f;
+
+ ch = gf64_mul(ah ^ al, bh ^ bl) ^ gf64_mul(al, bl);
+ cl = gf64_mul(gf64_mul(ah, bh), 0x21) ^ gf64_mul(al, bl);
+
+ return (ch << 6) ^ cl;
+}
+
+static int cafe_mul(int x)
+{
+ if (x == 0)
+ return 1;
+ return gf4096_mul(x, 0xe01);
+}
+
+static int cafe_nand_attach_chip(struct nand_chip *chip)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ int err = 0;
+
+ cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112,
+ &cafe->dmaaddr, GFP_KERNEL);
+ if (!cafe->dmabuf)
+ return -ENOMEM;
+
+ /* Set up DMA address */
+ cafe_writel(cafe, lower_32_bits(cafe->dmaaddr), NAND_DMA_ADDR0);
+ cafe_writel(cafe, upper_32_bits(cafe->dmaaddr), NAND_DMA_ADDR1);
+
+ cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
+ cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
+
+ /* Restore the DMA flag */
+ cafe->usedma = usedma;
+
+ cafe->ctl2 = BIT(27); /* Reed-Solomon ECC */
+ if (mtd->writesize == 2048)
+ cafe->ctl2 |= BIT(29); /* 2KiB page size */
+
+ /* Set up ECC according to the type of chip we found */
+ mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
+ if (mtd->writesize == 2048) {
+ cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
+ cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
+ } else if (mtd->writesize == 512) {
+ cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
+ cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
+ } else {
+ dev_warn(&cafe->pdev->dev,
+ "Unexpected NAND flash writesize %d. Aborting\n",
+ mtd->writesize);
+ err = -ENOTSUPP;
+ goto out_free_dma;
+ }
+
+ cafe->nand.ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
+ cafe->nand.ecc.placement = NAND_ECC_PLACEMENT_INTERLEAVED;
+ cafe->nand.ecc.size = mtd->writesize;
+ cafe->nand.ecc.bytes = 14;
+ cafe->nand.ecc.strength = 4;
+ cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
+ cafe->nand.ecc.write_oob = cafe_nand_write_oob;
+ cafe->nand.ecc.read_page = cafe_nand_read_page;
+ cafe->nand.ecc.read_oob = cafe_nand_read_oob;
+
+ return 0;
+
+ out_free_dma:
+ dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
+
+ return err;
+}
+
+static void cafe_nand_detach_chip(struct nand_chip *chip)
+{
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+
+ dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
+}
+
+static const struct nand_controller_ops cafe_nand_controller_ops = {
+ .attach_chip = cafe_nand_attach_chip,
+ .detach_chip = cafe_nand_detach_chip,
+};
+
+static int cafe_nand_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct mtd_info *mtd;
+ struct cafe_priv *cafe;
+ uint32_t ctrl;
+ int err = 0;
+
+ /* Very old versions shared the same PCI ident for all three
+ functions on the chip. Verify the class too... */
+ if ((pdev->class >> 8) != PCI_CLASS_MEMORY_FLASH)
+ return -ENODEV;
+
+ err = pci_enable_device(pdev);
+ if (err)
+ return err;
+
+ pci_set_master(pdev);
+
+ cafe = kzalloc(sizeof(*cafe), GFP_KERNEL);
+ if (!cafe) {
+ err = -ENOMEM;
+ goto out_disable_device;
+ }
+
+ mtd = nand_to_mtd(&cafe->nand);
+ mtd->dev.parent = &pdev->dev;
+ nand_set_controller_data(&cafe->nand, cafe);
+
+ cafe->pdev = pdev;
+ cafe->mmio = pci_iomap(pdev, 0, 0);
+ if (!cafe->mmio) {
+ dev_warn(&pdev->dev, "failed to iomap\n");
+ err = -ENOMEM;
+ goto out_free_mtd;
+ }
+
+ cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8);
+ if (!cafe->rs) {
+ err = -ENOMEM;
+ goto out_ior;
+ }
+
+ cafe->nand.legacy.cmdfunc = cafe_nand_cmdfunc;
+ cafe->nand.legacy.dev_ready = cafe_device_ready;
+ cafe->nand.legacy.read_byte = cafe_read_byte;
+ cafe->nand.legacy.read_buf = cafe_read_buf;
+ cafe->nand.legacy.write_buf = cafe_write_buf;
+ cafe->nand.legacy.select_chip = cafe_select_chip;
+ cafe->nand.legacy.set_features = nand_get_set_features_notsupp;
+ cafe->nand.legacy.get_features = nand_get_set_features_notsupp;
+
+ cafe->nand.legacy.chip_delay = 0;
+
+ /* Enable the following for a flash based bad block table */
+ cafe->nand.bbt_options = NAND_BBT_USE_FLASH;
+
+ if (skipbbt)
+ cafe->nand.options |= NAND_SKIP_BBTSCAN | NAND_NO_BBM_QUIRK;
+
+ if (numtimings && numtimings != 3) {
+ dev_warn(&cafe->pdev->dev, "%d timing register values ignored; precisely three are required\n", numtimings);
+ }
+
+ if (numtimings == 3) {
+ cafe_dev_dbg(&cafe->pdev->dev, "Using provided timings (%08x %08x %08x)\n",
+ timing[0], timing[1], timing[2]);
+ } else {
+ timing[0] = cafe_readl(cafe, NAND_TIMING1);
+ timing[1] = cafe_readl(cafe, NAND_TIMING2);
+ timing[2] = cafe_readl(cafe, NAND_TIMING3);
+
+ if (timing[0] | timing[1] | timing[2]) {
+ cafe_dev_dbg(&cafe->pdev->dev, "Timing registers already set (%08x %08x %08x)\n",
+ timing[0], timing[1], timing[2]);
+ } else {
+ dev_warn(&cafe->pdev->dev, "Timing registers unset; using most conservative defaults\n");
+ timing[0] = timing[1] = timing[2] = 0xffffffff;
+ }
+ }
+
+ /* Start off by resetting the NAND controller completely */
+ cafe_writel(cafe, 1, NAND_RESET);
+ cafe_writel(cafe, 0, NAND_RESET);
+
+ cafe_writel(cafe, timing[0], NAND_TIMING1);
+ cafe_writel(cafe, timing[1], NAND_TIMING2);
+ cafe_writel(cafe, timing[2], NAND_TIMING3);
+
+ cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
+ err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
+ "CAFE NAND", mtd);
+ if (err) {
+ dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);
+ goto out_free_rs;
+ }
+
+ /* Disable master reset, enable NAND clock */
+ ctrl = cafe_readl(cafe, GLOBAL_CTRL);
+ ctrl &= 0xffffeff0;
+ ctrl |= 0x00007000;
+ cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
+ cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
+ cafe_writel(cafe, 0, NAND_DMA_CTRL);
+
+ cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
+ cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
+
+ /* Enable NAND IRQ in global IRQ mask register */
+ cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
+ cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n",
+ cafe_readl(cafe, GLOBAL_CTRL),
+ cafe_readl(cafe, GLOBAL_IRQ_MASK));
+
+ /* Do not use the DMA during the NAND identification */
+ cafe->usedma = 0;
+
+ /* Scan to find existence of the device */
+ cafe->nand.legacy.dummy_controller.ops = &cafe_nand_controller_ops;
+ err = nand_scan(&cafe->nand, 2);
+ if (err)
+ goto out_irq;
+
+ pci_set_drvdata(pdev, mtd);
+
+ mtd->name = "cafe_nand";
+ err = mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0);
+ if (err)
+ goto out_cleanup_nand;
+
+ goto out;
+
+ out_cleanup_nand:
+ nand_cleanup(&cafe->nand);
+ out_irq:
+ /* Disable NAND IRQ in global IRQ mask register */
+ cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
+ free_irq(pdev->irq, mtd);
+ out_free_rs:
+ free_rs(cafe->rs);
+ out_ior:
+ pci_iounmap(pdev, cafe->mmio);
+ out_free_mtd:
+ kfree(cafe);
+ out_disable_device:
+ pci_disable_device(pdev);
+ out:
+ return err;
+}
+
+static void cafe_nand_remove(struct pci_dev *pdev)
+{
+ struct mtd_info *mtd = pci_get_drvdata(pdev);
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+ int ret;
+
+ /* Disable NAND IRQ in global IRQ mask register */
+ cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
+ free_irq(pdev->irq, mtd);
+ ret = mtd_device_unregister(mtd);
+ WARN_ON(ret);
+ nand_cleanup(chip);
+ free_rs(cafe->rs);
+ pci_iounmap(pdev, cafe->mmio);
+ dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
+ kfree(cafe);
+ pci_disable_device(pdev);
+}
+
+static const struct pci_device_id cafe_nand_tbl[] = {
+ { PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_88ALP01_NAND,
+ PCI_ANY_ID, PCI_ANY_ID },
+ { }
+};
+
+MODULE_DEVICE_TABLE(pci, cafe_nand_tbl);
+
+static int cafe_nand_resume(struct pci_dev *pdev)
+{
+ uint32_t ctrl;
+ struct mtd_info *mtd = pci_get_drvdata(pdev);
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct cafe_priv *cafe = nand_get_controller_data(chip);
+
+ /* Start off by resetting the NAND controller completely */
+ cafe_writel(cafe, 1, NAND_RESET);
+ cafe_writel(cafe, 0, NAND_RESET);
+ cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
+
+ /* Restore timing configuration */
+ cafe_writel(cafe, timing[0], NAND_TIMING1);
+ cafe_writel(cafe, timing[1], NAND_TIMING2);
+ cafe_writel(cafe, timing[2], NAND_TIMING3);
+
+ /* Disable master reset, enable NAND clock */
+ ctrl = cafe_readl(cafe, GLOBAL_CTRL);
+ ctrl &= 0xffffeff0;
+ ctrl |= 0x00007000;
+ cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
+ cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
+ cafe_writel(cafe, 0, NAND_DMA_CTRL);
+ cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
+ cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
+
+ /* Set up DMA address */
+ cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
+ if (sizeof(cafe->dmaaddr) > 4)
+ /* Shift in two parts to shut the compiler up */
+ cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
+ else
+ cafe_writel(cafe, 0, NAND_DMA_ADDR1);
+
+ /* Enable NAND IRQ in global IRQ mask register */
+ cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
+ return 0;
+}
+
+static struct pci_driver cafe_nand_pci_driver = {
+ .name = "CAFÉ NAND",
+ .id_table = cafe_nand_tbl,
+ .probe = cafe_nand_probe,
+ .remove = cafe_nand_remove,
+ .resume = cafe_nand_resume,
+};
+
+module_pci_driver(cafe_nand_pci_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("NAND flash driver for OLPC CAFÉ chip");