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path: root/drivers/mtd/nand/mxc_nand.c
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Diffstat (limited to 'drivers/mtd/nand/mxc_nand.c')
-rw-r--r--drivers/mtd/nand/mxc_nand.c146
1 files changed, 93 insertions, 53 deletions
diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index a8f550fec35e..372e0e38f59b 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -386,26 +386,51 @@ static irqreturn_t mxc_nfc_irq(int irq, void *dev_id)
/* This function polls the NANDFC to wait for the basic operation to
* complete by checking the INT bit of config2 register.
*/
-static void wait_op_done(struct mxc_nand_host *host, int useirq)
+static int wait_op_done(struct mxc_nand_host *host, int useirq)
{
- int max_retries = 8000;
+ int ret = 0;
+
+ /*
+ * If operation is already complete, don't bother to setup an irq or a
+ * loop.
+ */
+ if (host->devtype_data->check_int(host))
+ return 0;
if (useirq) {
- if (!host->devtype_data->check_int(host)) {
- reinit_completion(&host->op_completion);
- irq_control(host, 1);
- wait_for_completion(&host->op_completion);
+ unsigned long timeout;
+
+ reinit_completion(&host->op_completion);
+
+ irq_control(host, 1);
+
+ timeout = wait_for_completion_timeout(&host->op_completion, HZ);
+ if (!timeout && !host->devtype_data->check_int(host)) {
+ dev_dbg(host->dev, "timeout waiting for irq\n");
+ ret = -ETIMEDOUT;
}
} else {
- while (max_retries-- > 0) {
- if (host->devtype_data->check_int(host))
- break;
+ int max_retries = 8000;
+ int done;
+ do {
udelay(1);
+
+ done = host->devtype_data->check_int(host);
+ if (done)
+ break;
+
+ } while (--max_retries);
+
+ if (!done) {
+ dev_dbg(host->dev, "timeout polling for completion\n");
+ ret = -ETIMEDOUT;
}
- if (max_retries < 0)
- pr_debug("%s: INT not set\n", __func__);
}
+
+ WARN_ONCE(ret < 0, "timeout! useirq=%d\n", useirq);
+
+ return ret;
}
static void send_cmd_v3(struct mxc_nand_host *host, uint16_t cmd, int useirq)
@@ -527,30 +552,17 @@ static void send_page_v1(struct mtd_info *mtd, unsigned int ops)
static void send_read_id_v3(struct mxc_nand_host *host)
{
- struct nand_chip *this = &host->nand;
-
/* Read ID into main buffer */
writel(NFC_ID, NFC_V3_LAUNCH);
wait_op_done(host, true);
memcpy32_fromio(host->data_buf, host->main_area0, 16);
-
- if (this->options & NAND_BUSWIDTH_16) {
- /* compress the ID info */
- host->data_buf[1] = host->data_buf[2];
- host->data_buf[2] = host->data_buf[4];
- host->data_buf[3] = host->data_buf[6];
- host->data_buf[4] = host->data_buf[8];
- host->data_buf[5] = host->data_buf[10];
- }
}
/* Request the NANDFC to perform a read of the NAND device ID. */
static void send_read_id_v1_v2(struct mxc_nand_host *host)
{
- struct nand_chip *this = &host->nand;
-
/* NANDFC buffer 0 is used for device ID output */
writew(host->active_cs << 4, NFC_V1_V2_BUF_ADDR);
@@ -560,15 +572,6 @@ static void send_read_id_v1_v2(struct mxc_nand_host *host)
wait_op_done(host, true);
memcpy32_fromio(host->data_buf, host->main_area0, 16);
-
- if (this->options & NAND_BUSWIDTH_16) {
- /* compress the ID info */
- host->data_buf[1] = host->data_buf[2];
- host->data_buf[2] = host->data_buf[4];
- host->data_buf[3] = host->data_buf[6];
- host->data_buf[4] = host->data_buf[8];
- host->data_buf[5] = host->data_buf[10];
- }
}
static uint16_t get_dev_status_v3(struct mxc_nand_host *host)
@@ -694,9 +697,17 @@ static u_char mxc_nand_read_byte(struct mtd_info *mtd)
if (host->status_request)
return host->devtype_data->get_dev_status(host) & 0xFF;
- ret = *(uint8_t *)(host->data_buf + host->buf_start);
- host->buf_start++;
+ if (nand_chip->options & NAND_BUSWIDTH_16) {
+ /* only take the lower byte of each word */
+ ret = *(uint16_t *)(host->data_buf + host->buf_start);
+
+ host->buf_start += 2;
+ } else {
+ ret = *(uint8_t *)(host->data_buf + host->buf_start);
+ host->buf_start++;
+ }
+ pr_debug("%s: ret=0x%hhx (start=%u)\n", __func__, ret, host->buf_start);
return ret;
}
@@ -825,6 +836,12 @@ static void copy_spare(struct mtd_info *mtd, bool bfrom)
}
}
+/*
+ * MXC NANDFC can only perform full page+spare or spare-only read/write. When
+ * the upper layers perform a read/write buf operation, the saved column address
+ * is used to index into the full page. So usually this function is called with
+ * column == 0 (unless no column cycle is needed indicated by column == -1)
+ */
static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
{
struct nand_chip *nand_chip = mtd->priv;
@@ -832,16 +849,13 @@ static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
/* Write out column address, if necessary */
if (column != -1) {
- /*
- * MXC NANDFC can only perform full page+spare or
- * spare-only read/write. When the upper layers
- * perform a read/write buf operation, the saved column
- * address is used to index into the full page.
- */
- host->devtype_data->send_addr(host, 0, page_addr == -1);
+ host->devtype_data->send_addr(host, column & 0xff,
+ page_addr == -1);
if (mtd->writesize > 512)
/* another col addr cycle for 2k page */
- host->devtype_data->send_addr(host, 0, false);
+ host->devtype_data->send_addr(host,
+ (column >> 8) & 0xff,
+ false);
}
/* Write out page address, if necessary */
@@ -903,7 +917,7 @@ static void preset_v1(struct mtd_info *mtd)
struct mxc_nand_host *host = nand_chip->priv;
uint16_t config1 = 0;
- if (nand_chip->ecc.mode == NAND_ECC_HW)
+ if (nand_chip->ecc.mode == NAND_ECC_HW && mtd->writesize)
config1 |= NFC_V1_V2_CONFIG1_ECC_EN;
if (!host->devtype_data->irqpending_quirk)
@@ -931,9 +945,6 @@ static void preset_v2(struct mtd_info *mtd)
struct mxc_nand_host *host = nand_chip->priv;
uint16_t config1 = 0;
- if (nand_chip->ecc.mode == NAND_ECC_HW)
- config1 |= NFC_V1_V2_CONFIG1_ECC_EN;
-
config1 |= NFC_V2_CONFIG1_FP_INT;
if (!host->devtype_data->irqpending_quirk)
@@ -942,6 +953,9 @@ static void preset_v2(struct mtd_info *mtd)
if (mtd->writesize) {
uint16_t pages_per_block = mtd->erasesize / mtd->writesize;
+ if (nand_chip->ecc.mode == NAND_ECC_HW)
+ config1 |= NFC_V1_V2_CONFIG1_ECC_EN;
+
host->eccsize = get_eccsize(mtd);
if (host->eccsize == 4)
config1 |= NFC_V2_CONFIG1_ECC_MODE_4;
@@ -999,9 +1013,6 @@ static void preset_v3(struct mtd_info *mtd)
NFC_V3_CONFIG2_INT_MSK |
NFC_V3_CONFIG2_NUM_ADDR_PHASE0;
- if (chip->ecc.mode == NAND_ECC_HW)
- config2 |= NFC_V3_CONFIG2_ECC_EN;
-
addr_phases = fls(chip->pagemask) >> 3;
if (mtd->writesize == 2048) {
@@ -1016,6 +1027,9 @@ static void preset_v3(struct mtd_info *mtd)
}
if (mtd->writesize) {
+ if (chip->ecc.mode == NAND_ECC_HW)
+ config2 |= NFC_V3_CONFIG2_ECC_EN;
+
config2 |= NFC_V3_CONFIG2_PPB(
ffs(mtd->erasesize / mtd->writesize) - 6,
host->devtype_data->ppb_shift);
@@ -1066,6 +1080,9 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
host->status_request = true;
host->devtype_data->send_cmd(host, command, true);
+ WARN_ONCE(column != -1 || page_addr != -1,
+ "Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
+ command, column, page_addr);
mxc_do_addr_cycle(mtd, column, page_addr);
break;
@@ -1079,7 +1096,10 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
command = NAND_CMD_READ0; /* only READ0 is valid */
host->devtype_data->send_cmd(host, command, false);
- mxc_do_addr_cycle(mtd, column, page_addr);
+ WARN_ONCE(column < 0,
+ "Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
+ command, column, page_addr);
+ mxc_do_addr_cycle(mtd, 0, page_addr);
if (mtd->writesize > 512)
host->devtype_data->send_cmd(host,
@@ -1100,7 +1120,10 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
host->buf_start = column;
host->devtype_data->send_cmd(host, command, false);
- mxc_do_addr_cycle(mtd, column, page_addr);
+ WARN_ONCE(column < -1,
+ "Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
+ command, column, page_addr);
+ mxc_do_addr_cycle(mtd, 0, page_addr);
break;
case NAND_CMD_PAGEPROG:
@@ -1108,6 +1131,9 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
copy_spare(mtd, false);
host->devtype_data->send_page(mtd, NFC_INPUT);
host->devtype_data->send_cmd(host, command, true);
+ WARN_ONCE(column != -1 || page_addr != -1,
+ "Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
+ command, column, page_addr);
mxc_do_addr_cycle(mtd, column, page_addr);
break;
@@ -1115,15 +1141,29 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
host->devtype_data->send_cmd(host, command, true);
mxc_do_addr_cycle(mtd, column, page_addr);
host->devtype_data->send_read_id(host);
- host->buf_start = column;
+ host->buf_start = 0;
break;
case NAND_CMD_ERASE1:
case NAND_CMD_ERASE2:
host->devtype_data->send_cmd(host, command, false);
+ WARN_ONCE(column != -1,
+ "Unexpected column value (cmd=%u, col=%d)\n",
+ command, column);
mxc_do_addr_cycle(mtd, column, page_addr);
break;
+ case NAND_CMD_PARAM:
+ host->devtype_data->send_cmd(host, command, false);
+ mxc_do_addr_cycle(mtd, column, page_addr);
+ host->devtype_data->send_page(mtd, NFC_OUTPUT);
+ memcpy32_fromio(host->data_buf, host->main_area0, 512);
+ host->buf_start = 0;
+ break;
+ default:
+ WARN_ONCE(1, "Unimplemented command (cmd=%u)\n",
+ command);
+ break;
}
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-02 16:17:55 +0300