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>
diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index 55331df..5d5df49 100644
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -22,6 +22,7 @@
#include <plat/omap_hwmod.h>
#include <plat/cpu.h>
+#include <plat/i2c.h>
#include <plat/gpio.h>
#include <plat/dma.h>
#include <plat/mcspi.h>
@@ -2162,6 +2163,7 @@
.name = "i2c",
.sysc = &omap44xx_i2c_sysc,
.rev = OMAP_I2C_IP_VERSION_2,
+ .reset = &omap_i2c_reset,
};
static struct omap_i2c_dev_attr i2c_dev_attr = {
@@ -2207,7 +2209,7 @@
static struct omap_hwmod omap44xx_i2c1_hwmod = {
.name = "i2c1",
.class = &omap44xx_i2c_hwmod_class,
- .flags = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_16BIT_REG,
.mpu_irqs = omap44xx_i2c1_irqs,
.sdma_reqs = omap44xx_i2c1_sdma_reqs,
.main_clk = "i2c1_fck",
@@ -2261,7 +2263,7 @@
static struct omap_hwmod omap44xx_i2c2_hwmod = {
.name = "i2c2",
.class = &omap44xx_i2c_hwmod_class,
- .flags = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_16BIT_REG,
.mpu_irqs = omap44xx_i2c2_irqs,
.sdma_reqs = omap44xx_i2c2_sdma_reqs,
.main_clk = "i2c2_fck",
@@ -2315,7 +2317,7 @@
static struct omap_hwmod omap44xx_i2c3_hwmod = {
.name = "i2c3",
.class = &omap44xx_i2c_hwmod_class,
- .flags = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_16BIT_REG,
.mpu_irqs = omap44xx_i2c3_irqs,
.sdma_reqs = omap44xx_i2c3_sdma_reqs,
.main_clk = "i2c3_fck",
@@ -2369,7 +2371,7 @@
static struct omap_hwmod omap44xx_i2c4_hwmod = {
.name = "i2c4",
.class = &omap44xx_i2c_hwmod_class,
- .flags = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_16BIT_REG,
.mpu_irqs = omap44xx_i2c4_irqs,
.sdma_reqs = omap44xx_i2c4_sdma_reqs,
.main_clk = "i2c4_fck",