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OMAP: disable gpmc timeout safely for reenabling

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gpmc timeout is disabled and the reset counter
is set to 0. However, if later a driver activates
the timeout setting the reset to a valid value,
the old reset value with zero is still valid
for the first access. In fact, the timeout block
loads the reset counter after a successful access.

Found on a am335x board with a FPGA connected
to the GPMC bus together with the NAND.
When the FPGA driver in kernel activates
the timeout, the system hangs at the first access
by the NAND driver.

Signed-off-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Stefano Babic 2014-06-17 16:47:40 +02:00 committed by Tom Rini
parent fd3f401bc1
commit 734af242c2
1 changed files with 2 additions and 1 deletions
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3
arch/arm/cpu/armv7/omap-common/mem-common.c
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@ -121,7 +121,8 @@ void gpmc_init(void)
writel(0x00000008, &gpmc_cfg->sysconfig);
writel(0x00000000, &gpmc_cfg->irqstatus);
writel(0x00000000, &gpmc_cfg->irqenable);
writel(0x00000000, &gpmc_cfg->timeout_control);
/* disable timeout, set a safe reset value */
writel(0x00001ff0, &gpmc_cfg->timeout_control);
#ifdef CONFIG_NOR
writel(0x00000200, &gpmc_cfg->config);
#else