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OMAP: hwmod: fix the i2c-reset timeout during bootup

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The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a
special sequence to reset the module. The sequence is
 - Disable the I2C.
 - Write to SOFTRESET bit.
 - Enable the I2C.
 - Poll on the RESETDONE bit.
The sequence is implemented as a function and the i2c_class is updated with
the correct 'reset' pointer.  omap_hwmod_softreset function is implemented
which triggers the softreset by writing into sysconfig register. On following
this sequence, i2c module resets properly and timeouts are not seen.

Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: Avinash.H.M <avinashhm@ti.com>
[paul@pwsan.com: combined this patch with a patch to remove
 HWMOD_INIT_NO_RESET from the 44xx hwmod flags; change register
 offset conditional code to use the IP block revision; minor code
 cleanup]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Avinash.H.M
2011-07-10 05:27:16 -06:00
committed by Paul Walmsley
parent 4d4441a622
commit 6d3c55fd4f
8 changed files with 111 additions and 7 deletions
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3
arch/arm/plat-omap/include/plat/i2c.h
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@@ -53,4 +53,7 @@ struct omap_i2c_dev_attr {
void __init omap1_i2c_mux_pins(int bus_id);
void __init omap2_i2c_mux_pins(int bus_id);
struct omap_hwmod;
int omap_i2c_reset(struct omap_hwmod *oh);
#endif /* __ASM__ARCH_OMAP_I2C_H */