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path: root/drivers/mtd/nand/sh_flctl.c
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Diffstat (limited to 'drivers/mtd/nand/sh_flctl.c')
-rw-r--r--drivers/mtd/nand/sh_flctl.c878
1 files changed, 878 insertions, 0 deletions
diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
new file mode 100644
index 00000000000..821acb08ff1
--- /dev/null
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -0,0 +1,878 @@
+/*
+ * SuperH FLCTL nand controller
+ *
+ * Copyright © 2008 Renesas Solutions Corp.
+ * Copyright © 2008 Atom Create Engineering Co., Ltd.
+ *
+ * Based on fsl_elbc_nand.c, Copyright © 2006-2007 Freescale Semiconductor
+ *
+ * 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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/sh_flctl.h>
+
+static struct nand_ecclayout flctl_4secc_oob_16 = {
+ .eccbytes = 10,
+ .eccpos = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
+ .oobfree = {
+ {.offset = 12,
+ . length = 4} },
+};
+
+static struct nand_ecclayout flctl_4secc_oob_64 = {
+ .eccbytes = 10,
+ .eccpos = {48, 49, 50, 51, 52, 53, 54, 55, 56, 57},
+ .oobfree = {
+ {.offset = 60,
+ . length = 4} },
+};
+
+static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
+
+static struct nand_bbt_descr flctl_4secc_smallpage = {
+ .options = NAND_BBT_SCAN2NDPAGE,
+ .offs = 11,
+ .len = 1,
+ .pattern = scan_ff_pattern,
+};
+
+static struct nand_bbt_descr flctl_4secc_largepage = {
+ .options = 0,
+ .offs = 58,
+ .len = 2,
+ .pattern = scan_ff_pattern,
+};
+
+static void empty_fifo(struct sh_flctl *flctl)
+{
+ writel(0x000c0000, FLINTDMACR(flctl)); /* FIFO Clear */
+ writel(0x00000000, FLINTDMACR(flctl)); /* Clear Error flags */
+}
+
+static void start_translation(struct sh_flctl *flctl)
+{
+ writeb(TRSTRT, FLTRCR(flctl));
+}
+
+static void wait_completion(struct sh_flctl *flctl)
+{
+ uint32_t timeout = LOOP_TIMEOUT_MAX;
+
+ while (timeout--) {
+ if (readb(FLTRCR(flctl)) & TREND) {
+ writeb(0x0, FLTRCR(flctl));
+ return;
+ }
+ udelay(1);
+ }
+
+ printk(KERN_ERR "wait_completion(): Timeout occured \n");
+ writeb(0x0, FLTRCR(flctl));
+}
+
+static void set_addr(struct mtd_info *mtd, int column, int page_addr)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ uint32_t addr = 0;
+
+ if (column == -1) {
+ addr = page_addr; /* ERASE1 */
+ } else if (page_addr != -1) {
+ /* SEQIN, READ0, etc.. */
+ if (flctl->page_size) {
+ addr = column & 0x0FFF;
+ addr |= (page_addr & 0xff) << 16;
+ addr |= ((page_addr >> 8) & 0xff) << 24;
+ /* big than 128MB */
+ if (flctl->rw_ADRCNT == ADRCNT2_E) {
+ uint32_t addr2;
+ addr2 = (page_addr >> 16) & 0xff;
+ writel(addr2, FLADR2(flctl));
+ }
+ } else {
+ addr = column;
+ addr |= (page_addr & 0xff) << 8;
+ addr |= ((page_addr >> 8) & 0xff) << 16;
+ addr |= ((page_addr >> 16) & 0xff) << 24;
+ }
+ }
+ writel(addr, FLADR(flctl));
+}
+
+static void wait_rfifo_ready(struct sh_flctl *flctl)
+{
+ uint32_t timeout = LOOP_TIMEOUT_MAX;
+
+ while (timeout--) {
+ uint32_t val;
+ /* check FIFO */
+ val = readl(FLDTCNTR(flctl)) >> 16;
+ if (val & 0xFF)
+ return;
+ udelay(1);
+ }
+ printk(KERN_ERR "wait_rfifo_ready(): Timeout occured \n");
+}
+
+static void wait_wfifo_ready(struct sh_flctl *flctl)
+{
+ uint32_t len, timeout = LOOP_TIMEOUT_MAX;
+
+ while (timeout--) {
+ /* check FIFO */
+ len = (readl(FLDTCNTR(flctl)) >> 16) & 0xFF;
+ if (len >= 4)
+ return;
+ udelay(1);
+ }
+ printk(KERN_ERR "wait_wfifo_ready(): Timeout occured \n");
+}
+
+static int wait_recfifo_ready(struct sh_flctl *flctl)
+{
+ uint32_t timeout = LOOP_TIMEOUT_MAX;
+ int checked[4];
+ void __iomem *ecc_reg[4];
+ int i;
+ uint32_t data, size;
+
+ memset(checked, 0, sizeof(checked));
+
+ while (timeout--) {
+ size = readl(FLDTCNTR(flctl)) >> 24;
+ if (size & 0xFF)
+ return 0; /* success */
+
+ if (readl(FL4ECCCR(flctl)) & _4ECCFA)
+ return 1; /* can't correct */
+
+ udelay(1);
+ if (!(readl(FL4ECCCR(flctl)) & _4ECCEND))
+ continue;
+
+ /* start error correction */
+ ecc_reg[0] = FL4ECCRESULT0(flctl);
+ ecc_reg[1] = FL4ECCRESULT1(flctl);
+ ecc_reg[2] = FL4ECCRESULT2(flctl);
+ ecc_reg[3] = FL4ECCRESULT3(flctl);
+
+ for (i = 0; i < 3; i++) {
+ data = readl(ecc_reg[i]);
+ if (data != INIT_FL4ECCRESULT_VAL && !checked[i]) {
+ uint8_t org;
+ int index;
+
+ index = data >> 16;
+ org = flctl->done_buff[index];
+ flctl->done_buff[index] = org ^ (data & 0xFF);
+ checked[i] = 1;
+ }
+ }
+
+ writel(0, FL4ECCCR(flctl));
+ }
+
+ printk(KERN_ERR "wait_recfifo_ready(): Timeout occured \n");
+ return 1; /* timeout */
+}
+
+static void wait_wecfifo_ready(struct sh_flctl *flctl)
+{
+ uint32_t timeout = LOOP_TIMEOUT_MAX;
+ uint32_t len;
+
+ while (timeout--) {
+ /* check FLECFIFO */
+ len = (readl(FLDTCNTR(flctl)) >> 24) & 0xFF;
+ if (len >= 4)
+ return;
+ udelay(1);
+ }
+ printk(KERN_ERR "wait_wecfifo_ready(): Timeout occured \n");
+}
+
+static void read_datareg(struct sh_flctl *flctl, int offset)
+{
+ unsigned long data;
+ unsigned long *buf = (unsigned long *)&flctl->done_buff[offset];
+
+ wait_completion(flctl);
+
+ data = readl(FLDATAR(flctl));
+ *buf = le32_to_cpu(data);
+}
+
+static void read_fiforeg(struct sh_flctl *flctl, int rlen, int offset)
+{
+ int i, len_4align;
+ unsigned long *buf = (unsigned long *)&flctl->done_buff[offset];
+ void *fifo_addr = (void *)FLDTFIFO(flctl);
+
+ len_4align = (rlen + 3) / 4;
+
+ for (i = 0; i < len_4align; i++) {
+ wait_rfifo_ready(flctl);
+ buf[i] = readl(fifo_addr);
+ buf[i] = be32_to_cpu(buf[i]);
+ }
+}
+
+static int read_ecfiforeg(struct sh_flctl *flctl, uint8_t *buff)
+{
+ int i;
+ unsigned long *ecc_buf = (unsigned long *)buff;
+ void *fifo_addr = (void *)FLECFIFO(flctl);
+
+ for (i = 0; i < 4; i++) {
+ if (wait_recfifo_ready(flctl))
+ return 1;
+ ecc_buf[i] = readl(fifo_addr);
+ ecc_buf[i] = be32_to_cpu(ecc_buf[i]);
+ }
+
+ return 0;
+}
+
+static void write_fiforeg(struct sh_flctl *flctl, int rlen, int offset)
+{
+ int i, len_4align;
+ unsigned long *data = (unsigned long *)&flctl->done_buff[offset];
+ void *fifo_addr = (void *)FLDTFIFO(flctl);
+
+ len_4align = (rlen + 3) / 4;
+ for (i = 0; i < len_4align; i++) {
+ wait_wfifo_ready(flctl);
+ writel(cpu_to_be32(data[i]), fifo_addr);
+ }
+}
+
+static void set_cmd_regs(struct mtd_info *mtd, uint32_t cmd, uint32_t flcmcdr_val)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ uint32_t flcmncr_val = readl(FLCMNCR(flctl));
+ uint32_t flcmdcr_val, addr_len_bytes = 0;
+
+ /* Set SNAND bit if page size is 2048byte */
+ if (flctl->page_size)
+ flcmncr_val |= SNAND_E;
+ else
+ flcmncr_val &= ~SNAND_E;
+
+ /* default FLCMDCR val */
+ flcmdcr_val = DOCMD1_E | DOADR_E;
+
+ /* Set for FLCMDCR */
+ switch (cmd) {
+ case NAND_CMD_ERASE1:
+ addr_len_bytes = flctl->erase_ADRCNT;
+ flcmdcr_val |= DOCMD2_E;
+ break;
+ case NAND_CMD_READ0:
+ case NAND_CMD_READOOB:
+ addr_len_bytes = flctl->rw_ADRCNT;
+ flcmdcr_val |= CDSRC_E;
+ break;
+ case NAND_CMD_SEQIN:
+ /* This case is that cmd is READ0 or READ1 or READ00 */
+ flcmdcr_val &= ~DOADR_E; /* ONLY execute 1st cmd */
+ break;
+ case NAND_CMD_PAGEPROG:
+ addr_len_bytes = flctl->rw_ADRCNT;
+ flcmdcr_val |= DOCMD2_E | CDSRC_E | SELRW;
+ break;
+ case NAND_CMD_READID:
+ flcmncr_val &= ~SNAND_E;
+ addr_len_bytes = ADRCNT_1;
+ break;
+ case NAND_CMD_STATUS:
+ case NAND_CMD_RESET:
+ flcmncr_val &= ~SNAND_E;
+ flcmdcr_val &= ~(DOADR_E | DOSR_E);
+ break;
+ default:
+ break;
+ }
+
+ /* Set address bytes parameter */
+ flcmdcr_val |= addr_len_bytes;
+
+ /* Now actually write */
+ writel(flcmncr_val, FLCMNCR(flctl));
+ writel(flcmdcr_val, FLCMDCR(flctl));
+ writel(flcmcdr_val, FLCMCDR(flctl));
+}
+
+static int flctl_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf)
+{
+ int i, eccsize = chip->ecc.size;
+ int eccbytes = chip->ecc.bytes;
+ int eccsteps = chip->ecc.steps;
+ uint8_t *p = buf;
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+ chip->read_buf(mtd, p, eccsize);
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ if (flctl->hwecc_cant_correct[i])
+ mtd->ecc_stats.failed++;
+ else
+ mtd->ecc_stats.corrected += 0;
+ }
+
+ return 0;
+}
+
+static void flctl_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf)
+{
+ int i, eccsize = chip->ecc.size;
+ int eccbytes = chip->ecc.bytes;
+ int eccsteps = chip->ecc.steps;
+ const uint8_t *p = buf;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
+ chip->write_buf(mtd, p, eccsize);
+}
+
+static void execmd_read_page_sector(struct mtd_info *mtd, int page_addr)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ int sector, page_sectors;
+
+ if (flctl->page_size)
+ page_sectors = 4;
+ else
+ page_sectors = 1;
+
+ writel(readl(FLCMNCR(flctl)) | ACM_SACCES_MODE | _4ECCCORRECT,
+ FLCMNCR(flctl));
+
+ set_cmd_regs(mtd, NAND_CMD_READ0,
+ (NAND_CMD_READSTART << 8) | NAND_CMD_READ0);
+
+ for (sector = 0; sector < page_sectors; sector++) {
+ int ret;
+
+ empty_fifo(flctl);
+ writel(readl(FLCMDCR(flctl)) | 1, FLCMDCR(flctl));
+ writel(page_addr << 2 | sector, FLADR(flctl));
+
+ start_translation(flctl);
+ read_fiforeg(flctl, 512, 512 * sector);
+
+ ret = read_ecfiforeg(flctl,
+ &flctl->done_buff[mtd->writesize + 16 * sector]);
+
+ if (ret)
+ flctl->hwecc_cant_correct[sector] = 1;
+
+ writel(0x0, FL4ECCCR(flctl));
+ wait_completion(flctl);
+ }
+ writel(readl(FLCMNCR(flctl)) & ~(ACM_SACCES_MODE | _4ECCCORRECT),
+ FLCMNCR(flctl));
+}
+
+static void execmd_read_oob(struct mtd_info *mtd, int page_addr)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+
+ set_cmd_regs(mtd, NAND_CMD_READ0,
+ (NAND_CMD_READSTART << 8) | NAND_CMD_READ0);
+
+ empty_fifo(flctl);
+ if (flctl->page_size) {
+ int i;
+ /* In case that the page size is 2k */
+ for (i = 0; i < 16 * 3; i++)
+ flctl->done_buff[i] = 0xFF;
+
+ set_addr(mtd, 3 * 528 + 512, page_addr);
+ writel(16, FLDTCNTR(flctl));
+
+ start_translation(flctl);
+ read_fiforeg(flctl, 16, 16 * 3);
+ wait_completion(flctl);
+ } else {
+ /* In case that the page size is 512b */
+ set_addr(mtd, 512, page_addr);
+ writel(16, FLDTCNTR(flctl));
+
+ start_translation(flctl);
+ read_fiforeg(flctl, 16, 0);
+ wait_completion(flctl);
+ }
+}
+
+static void execmd_write_page_sector(struct mtd_info *mtd)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ int i, page_addr = flctl->seqin_page_addr;
+ int sector, page_sectors;
+
+ if (flctl->page_size)
+ page_sectors = 4;
+ else
+ page_sectors = 1;
+
+ writel(readl(FLCMNCR(flctl)) | ACM_SACCES_MODE, FLCMNCR(flctl));
+
+ set_cmd_regs(mtd, NAND_CMD_PAGEPROG,
+ (NAND_CMD_PAGEPROG << 8) | NAND_CMD_SEQIN);
+
+ for (sector = 0; sector < page_sectors; sector++) {
+ empty_fifo(flctl);
+ writel(readl(FLCMDCR(flctl)) | 1, FLCMDCR(flctl));
+ writel(page_addr << 2 | sector, FLADR(flctl));
+
+ start_translation(flctl);
+ write_fiforeg(flctl, 512, 512 * sector);
+
+ for (i = 0; i < 4; i++) {
+ wait_wecfifo_ready(flctl); /* wait for write ready */
+ writel(0xFFFFFFFF, FLECFIFO(flctl));
+ }
+ wait_completion(flctl);
+ }
+
+ writel(readl(FLCMNCR(flctl)) & ~ACM_SACCES_MODE, FLCMNCR(flctl));
+}
+
+static void execmd_write_oob(struct mtd_info *mtd)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ int page_addr = flctl->seqin_page_addr;
+ int sector, page_sectors;
+
+ if (flctl->page_size) {
+ sector = 3;
+ page_sectors = 4;
+ } else {
+ sector = 0;
+ page_sectors = 1;
+ }
+
+ set_cmd_regs(mtd, NAND_CMD_PAGEPROG,
+ (NAND_CMD_PAGEPROG << 8) | NAND_CMD_SEQIN);
+
+ for (; sector < page_sectors; sector++) {
+ empty_fifo(flctl);
+ set_addr(mtd, sector * 528 + 512, page_addr);
+ writel(16, FLDTCNTR(flctl)); /* set read size */
+
+ start_translation(flctl);
+ write_fiforeg(flctl, 16, 16 * sector);
+ wait_completion(flctl);
+ }
+}
+
+static void flctl_cmdfunc(struct mtd_info *mtd, unsigned int command,
+ int column, int page_addr)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ uint32_t read_cmd = 0;
+
+ flctl->read_bytes = 0;
+ if (command != NAND_CMD_PAGEPROG)
+ flctl->index = 0;
+
+ switch (command) {
+ case NAND_CMD_READ1:
+ case NAND_CMD_READ0:
+ if (flctl->hwecc) {
+ /* read page with hwecc */
+ execmd_read_page_sector(mtd, page_addr);
+ break;
+ }
+ empty_fifo(flctl);
+ if (flctl->page_size)
+ set_cmd_regs(mtd, command, (NAND_CMD_READSTART << 8)
+ | command);
+ else
+ set_cmd_regs(mtd, command, command);
+
+ set_addr(mtd, 0, page_addr);
+
+ flctl->read_bytes = mtd->writesize + mtd->oobsize;
+ flctl->index += column;
+ goto read_normal_exit;
+
+ case NAND_CMD_READOOB:
+ if (flctl->hwecc) {
+ /* read page with hwecc */
+ execmd_read_oob(mtd, page_addr);
+ break;
+ }
+
+ empty_fifo(flctl);
+ if (flctl->page_size) {
+ set_cmd_regs(mtd, command, (NAND_CMD_READSTART << 8)
+ | NAND_CMD_READ0);
+ set_addr(mtd, mtd->writesize, page_addr);
+ } else {
+ set_cmd_regs(mtd, command, command);
+ set_addr(mtd, 0, page_addr);
+ }
+ flctl->read_bytes = mtd->oobsize;
+ goto read_normal_exit;
+
+ case NAND_CMD_READID:
+ empty_fifo(flctl);
+ set_cmd_regs(mtd, command, command);
+ set_addr(mtd, 0, 0);
+
+ flctl->read_bytes = 4;
+ writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */
+ start_translation(flctl);
+ read_datareg(flctl, 0); /* read and end */
+ break;
+
+ case NAND_CMD_ERASE1:
+ flctl->erase1_page_addr = page_addr;
+ break;
+
+ case NAND_CMD_ERASE2:
+ set_cmd_regs(mtd, NAND_CMD_ERASE1,
+ (command << 8) | NAND_CMD_ERASE1);
+ set_addr(mtd, -1, flctl->erase1_page_addr);
+ start_translation(flctl);
+ wait_completion(flctl);
+ break;
+
+ case NAND_CMD_SEQIN:
+ if (!flctl->page_size) {
+ /* output read command */
+ if (column >= mtd->writesize) {
+ column -= mtd->writesize;
+ read_cmd = NAND_CMD_READOOB;
+ } else if (column < 256) {
+ read_cmd = NAND_CMD_READ0;
+ } else {
+ column -= 256;
+ read_cmd = NAND_CMD_READ1;
+ }
+ }
+ flctl->seqin_column = column;
+ flctl->seqin_page_addr = page_addr;
+ flctl->seqin_read_cmd = read_cmd;
+ break;
+
+ case NAND_CMD_PAGEPROG:
+ empty_fifo(flctl);
+ if (!flctl->page_size) {
+ set_cmd_regs(mtd, NAND_CMD_SEQIN,
+ flctl->seqin_read_cmd);
+ set_addr(mtd, -1, -1);
+ writel(0, FLDTCNTR(flctl)); /* set 0 size */
+ start_translation(flctl);
+ wait_completion(flctl);
+ }
+ if (flctl->hwecc) {
+ /* write page with hwecc */
+ if (flctl->seqin_column == mtd->writesize)
+ execmd_write_oob(mtd);
+ else if (!flctl->seqin_column)
+ execmd_write_page_sector(mtd);
+ else
+ printk(KERN_ERR "Invalid address !?\n");
+ break;
+ }
+ set_cmd_regs(mtd, command, (command << 8) | NAND_CMD_SEQIN);
+ set_addr(mtd, flctl->seqin_column, flctl->seqin_page_addr);
+ writel(flctl->index, FLDTCNTR(flctl)); /* set write size */
+ start_translation(flctl);
+ write_fiforeg(flctl, flctl->index, 0);
+ wait_completion(flctl);
+ break;
+
+ case NAND_CMD_STATUS:
+ set_cmd_regs(mtd, command, command);
+ set_addr(mtd, -1, -1);
+
+ flctl->read_bytes = 1;
+ writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */
+ start_translation(flctl);
+ read_datareg(flctl, 0); /* read and end */
+ break;
+
+ case NAND_CMD_RESET:
+ set_cmd_regs(mtd, command, command);
+ set_addr(mtd, -1, -1);
+
+ writel(0, FLDTCNTR(flctl)); /* set 0 size */
+ start_translation(flctl);
+ wait_completion(flctl);
+ break;
+
+ default:
+ break;
+ }
+ return;
+
+read_normal_exit:
+ writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */
+ start_translation(flctl);
+ read_fiforeg(flctl, flctl->read_bytes, 0);
+ wait_completion(flctl);
+ return;
+}
+
+static void flctl_select_chip(struct mtd_info *mtd, int chipnr)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ uint32_t flcmncr_val = readl(FLCMNCR(flctl));
+
+ switch (chipnr) {
+ case -1:
+ flcmncr_val &= ~CE0_ENABLE;
+ writel(flcmncr_val, FLCMNCR(flctl));
+ break;
+ case 0:
+ flcmncr_val |= CE0_ENABLE;
+ writel(flcmncr_val, FLCMNCR(flctl));
+ break;
+ default:
+ BUG();
+ }
+}
+
+static void flctl_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ int i, index = flctl->index;
+
+ for (i = 0; i < len; i++)
+ flctl->done_buff[index + i] = buf[i];
+ flctl->index += len;
+}
+
+static uint8_t flctl_read_byte(struct mtd_info *mtd)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ int index = flctl->index;
+ uint8_t data;
+
+ data = flctl->done_buff[index];
+ flctl->index++;
+ return data;
+}
+
+static void flctl_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ buf[i] = flctl_read_byte(mtd);
+}
+
+static int flctl_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ if (buf[i] != flctl_read_byte(mtd))
+ return -EFAULT;
+ return 0;
+}
+
+static void flctl_register_init(struct sh_flctl *flctl, unsigned long val)
+{
+ writel(val, FLCMNCR(flctl));
+}
+
+static int flctl_chip_init_tail(struct mtd_info *mtd)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ struct nand_chip *chip = &flctl->chip;
+
+ if (mtd->writesize == 512) {
+ flctl->page_size = 0;
+ if (chip->chipsize > (32 << 20)) {
+ /* big than 32MB */
+ flctl->rw_ADRCNT = ADRCNT_4;
+ flctl->erase_ADRCNT = ADRCNT_3;
+ } else if (chip->chipsize > (2 << 16)) {
+ /* big than 128KB */
+ flctl->rw_ADRCNT = ADRCNT_3;
+ flctl->erase_ADRCNT = ADRCNT_2;
+ } else {
+ flctl->rw_ADRCNT = ADRCNT_2;
+ flctl->erase_ADRCNT = ADRCNT_1;
+ }
+ } else {
+ flctl->page_size = 1;
+ if (chip->chipsize > (128 << 20)) {
+ /* big than 128MB */
+ flctl->rw_ADRCNT = ADRCNT2_E;
+ flctl->erase_ADRCNT = ADRCNT_3;
+ } else if (chip->chipsize > (8 << 16)) {
+ /* big than 512KB */
+ flctl->rw_ADRCNT = ADRCNT_4;
+ flctl->erase_ADRCNT = ADRCNT_2;
+ } else {
+ flctl->rw_ADRCNT = ADRCNT_3;
+ flctl->erase_ADRCNT = ADRCNT_1;
+ }
+ }
+
+ if (flctl->hwecc) {
+ if (mtd->writesize == 512) {
+ chip->ecc.layout = &flctl_4secc_oob_16;
+ chip->badblock_pattern = &flctl_4secc_smallpage;
+ } else {
+ chip->ecc.layout = &flctl_4secc_oob_64;
+ chip->badblock_pattern = &flctl_4secc_largepage;
+ }
+
+ chip->ecc.size = 512;
+ chip->ecc.bytes = 10;
+ chip->ecc.read_page = flctl_read_page_hwecc;
+ chip->ecc.write_page = flctl_write_page_hwecc;
+ chip->ecc.mode = NAND_ECC_HW;
+
+ /* 4 symbols ECC enabled */
+ writel(readl(FLCMNCR(flctl)) | _4ECCEN | ECCPOS2 | ECCPOS_02,
+ FLCMNCR(flctl));
+ } else {
+ chip->ecc.mode = NAND_ECC_SOFT;
+ }
+
+ return 0;
+}
+
+static int __init flctl_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct sh_flctl *flctl;
+ struct mtd_info *flctl_mtd;
+ struct nand_chip *nand;
+ struct sh_flctl_platform_data *pdata;
+ int ret;
+
+ pdata = pdev->dev.platform_data;
+ if (pdata == NULL) {
+ printk(KERN_ERR "sh_flctl platform_data not found.\n");
+ return -ENODEV;
+ }
+
+ flctl = kzalloc(sizeof(struct sh_flctl), GFP_KERNEL);
+ if (!flctl) {
+ printk(KERN_ERR "Unable to allocate NAND MTD dev structure.\n");
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ printk(KERN_ERR "%s: resource not found.\n", __func__);
+ ret = -ENODEV;
+ goto err;
+ }
+
+ flctl->reg = ioremap(res->start, res->end - res->start + 1);
+ if (flctl->reg == NULL) {
+ printk(KERN_ERR "%s: ioremap error.\n", __func__);
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, flctl);
+ flctl_mtd = &flctl->mtd;
+ nand = &flctl->chip;
+ flctl_mtd->priv = nand;
+ flctl->hwecc = pdata->has_hwecc;
+
+ flctl_register_init(flctl, pdata->flcmncr_val);
+
+ nand->options = NAND_NO_AUTOINCR;
+
+ /* Set address of hardware control function */
+ /* 20 us command delay time */
+ nand->chip_delay = 20;
+
+ nand->read_byte = flctl_read_byte;
+ nand->write_buf = flctl_write_buf;
+ nand->read_buf = flctl_read_buf;
+ nand->verify_buf = flctl_verify_buf;
+ nand->select_chip = flctl_select_chip;
+ nand->cmdfunc = flctl_cmdfunc;
+
+ ret = nand_scan_ident(flctl_mtd, 1);
+ if (ret)
+ goto err;
+
+ ret = flctl_chip_init_tail(flctl_mtd);
+ if (ret)
+ goto err;
+
+ ret = nand_scan_tail(flctl_mtd);
+ if (ret)
+ goto err;
+
+ add_mtd_partitions(flctl_mtd, pdata->parts, pdata->nr_parts);
+
+ return 0;
+
+err:
+ kfree(flctl);
+ return ret;
+}
+
+static int __exit flctl_remove(struct platform_device *pdev)
+{
+ struct sh_flctl *flctl = platform_get_drvdata(pdev);
+
+ nand_release(&flctl->mtd);
+ kfree(flctl);
+
+ return 0;
+}
+
+static struct platform_driver flctl_driver = {
+ .probe = flctl_probe,
+ .remove = flctl_remove,
+ .driver = {
+ .name = "sh_flctl",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init flctl_nand_init(void)
+{
+ return platform_driver_register(&flctl_driver);
+}
+
+static void __exit flctl_nand_cleanup(void)
+{
+ platform_driver_unregister(&flctl_driver);
+}
+
+module_init(flctl_nand_init);
+module_exit(flctl_nand_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yoshihiro Shimoda");
+MODULE_DESCRIPTION("SuperH FLCTL driver");
+MODULE_ALIAS("platform:sh_flctl");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-15 06:02:21 +0000