Add timeout to onenand_wait ready loop as it hangs here indefinitely when chip not present. Once there, do the same for onenand_bbt_wait as well (note: recent Linux driver code does the same)
Signed-off-by: Ladislav Michl ladis@linux-mips.org
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index 03deabc..d194d97 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -20,6 +20,7 @@ */
#include <common.h> +#include <watchdog.h> #include <linux/compat.h> #include <linux/mtd/mtd.h> #include "linux/mtd/flashchip.h" @@ -467,15 +468,18 @@ static int onenand_read_ecc(struct onenand_chip *this) static int onenand_wait(struct mtd_info *mtd, int state) { struct onenand_chip *this = mtd->priv; - unsigned int flags = ONENAND_INT_MASTER; unsigned int interrupt = 0; unsigned int ctrl;
- while (1) { + /* Wait at most 20ms ... */ + u32 timeo = (CONFIG_SYS_HZ * 20) / 1000; + u32 time_start = get_timer(0); + do { + WATCHDOG_RESET(); + if (get_timer(time_start) > timeo) + return -EIO; interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT); - if (interrupt & flags) - break; - } + } while ((interrupt & ONENAND_INT_MASTER) == 0);
ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
@@ -1154,15 +1158,18 @@ int onenand_read_oob(struct mtd_info *mtd, loff_t from, static int onenand_bbt_wait(struct mtd_info *mtd, int state) { struct onenand_chip *this = mtd->priv; - unsigned int flags = ONENAND_INT_MASTER; unsigned int interrupt; unsigned int ctrl;
- while (1) { + /* Wait at most 20ms ... */ + u32 timeo = (CONFIG_SYS_HZ * 20) / 1000; + u32 time_start = get_timer(0); + do { + WATCHDOG_RESET(); + if (get_timer(time_start) > timeo) + return ONENAND_BBT_READ_FATAL_ERROR; interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT); - if (interrupt & flags) - break; - } + } while ((interrupt & ONENAND_INT_MASTER) == 0);
/* To get correct interrupt status in timeout case */ interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT); @@ -2536,7 +2543,8 @@ static int onenand_chip_probe(struct mtd_info *mtd) this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
/* Wait reset */ - this->wait(mtd, FL_RESETING); + if (this->wait(mtd, FL_RESETING)) + return -ENXIO;
/* Restore system configuration 1 */ this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);