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authorAvinash.H.M <avinashhm@ti.com>2011-07-10 05:27:16 -0600
committerPaul Walmsley <paul@pwsan.com>2011-07-10 05:27:16 -0600
commit6d3c55fd4f0f94a9455d30df9414ddb0f755f402 (patch)
tree7b1838e66fa1a424db45c84855062df121b9506b /arch/arm/plat-omap
parent4d4441a6221ca3a30290045b7b696e5134646449 (diff)
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OMAP: hwmod: fix the i2c-reset timeout during bootup
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>
Diffstat (limited to 'arch/arm/plat-omap')
-rw-r--r--arch/arm/plat-omap/include/plat/i2c.h3
-rw-r--r--arch/arm/plat-omap/include/plat/omap_hwmod.h1
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/include/plat/i2c.h b/arch/arm/plat-omap/include/plat/i2c.h
index fd75dadfa89c..7c22b9e10dc3 100644
--- a/arch/arm/plat-omap/include/plat/i2c.h
+++ b/arch/arm/plat-omap/include/plat/i2c.h
@@ -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 */
diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index ce06ac6a9709..fafdfe3c8d4e 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -566,6 +566,7 @@ void omap_hwmod_ocp_barrier(struct omap_hwmod *oh);
void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs);
u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs);
+int omap_hwmod_softreset(struct omap_hwmod *oh);
int omap_hwmod_count_resources(struct omap_hwmod *oh);
int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res);
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