I2C: OMAP2+: Set hwmod flags to only allow 16-bit accesses to i2c

Peter Maydell noticed when running under QEMU he was getting
errors reporting 32-bit access to I2C peripheral unit registers
that are documented to be 8 or 16-bit only[1][2]

The I2C driver is blameless as it wraps its accesses in a
function using __raw_writew and __raw_readw, it turned out it
is the hwmod stuff.

However the hwmod code already has a flag to force a
perhipheral unit to only be accessed using 16-bit operations.

This patch applies the 16-bit only flag to the 2430,
OMAP3xxx and OMAP44xx hwmod structs.  2420 was already
correctly marked up as 16-bit.

The 2430 change will need testing by TI as arranged
in the comments to the previous patch version.

When the 16-bit flag is or-ed with other flags, it is placed
first as requested in comments.

[1] OMAP4430 Technical reference manual section 23.1.6.2
[2] OMAP3530 Techincal reference manual section 18.6

Cc: patches@linaro.org
Cc: Ben Dooks <ben-linux@fluff.org>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

3 files changed, 9 insertions, 4 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod_2430_data.c b/arch/arm/mach-omap2/omap_hwmod_2430_data.c
index 2a52f025bd06..19ddf082144d 100644
--- a/arch/arm/mach-omap2/omap_hwmod_2430_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_2430_data.c
@@ -1092,6 +1092,7 @@ static struct omap_hwmod_ocp_if *omap2430_i2c1_slaves[] = {
 
 static struct omap_hwmod omap2430_i2c1_hwmod = {
         .name           = "i2c1",
+        .flags          = HWMOD_16BIT_REG,
         .mpu_irqs       = omap2_i2c1_mpu_irqs,
         .sdma_reqs      = omap2_i2c1_sdma_reqs,
         .main_clk       = "i2chs1_fck",
@@ -1127,6 +1128,7 @@ static struct omap_hwmod_ocp_if *omap2430_i2c2_slaves[] = {
 
 static struct omap_hwmod omap2430_i2c2_hwmod = {
         .name           = "i2c2",
+        .flags          = HWMOD_16BIT_REG,
         .mpu_irqs       = omap2_i2c2_mpu_irqs,
         .sdma_reqs      = omap2_i2c2_sdma_reqs,
         .main_clk       = "i2chs2_fck",
diff --git a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
index 1a52716e48bf..542a11b19a99 100644
--- a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
@@ -1615,6 +1615,7 @@ static struct omap_hwmod_ocp_if *omap3xxx_i2c1_slaves[] = {
 
 static struct omap_hwmod omap3xxx_i2c1_hwmod = {
         .name           = "i2c1",
+        .flags          = HWMOD_16BIT_REG,
         .mpu_irqs       = omap2_i2c1_mpu_irqs,
         .sdma_reqs      = omap2_i2c1_sdma_reqs,
         .main_clk       = "i2c1_fck",
@@ -1646,6 +1647,7 @@ static struct omap_hwmod_ocp_if *omap3xxx_i2c2_slaves[] = {
 
 static struct omap_hwmod omap3xxx_i2c2_hwmod = {
         .name           = "i2c2",
+        .flags          = HWMOD_16BIT_REG,
         .mpu_irqs       = omap2_i2c2_mpu_irqs,
         .sdma_reqs      = omap2_i2c2_sdma_reqs,
         .main_clk       = "i2c2_fck",
@@ -1688,6 +1690,7 @@ static struct omap_hwmod_ocp_if *omap3xxx_i2c3_slaves[] = {
 
 static struct omap_hwmod omap3xxx_i2c3_hwmod = {
         .name           = "i2c3",
+        .flags          = HWMOD_16BIT_REG,
         .mpu_irqs       = i2c3_mpu_irqs,
         .sdma_reqs      = i2c3_sdma_reqs,
         .main_clk       = "i2c3_fck",
diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index b25ab836fbf0..2ebccb8820c5 100644
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -2201,7 +2201,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c1_slaves[] = {
 static struct omap_hwmod omap44xx_i2c1_hwmod = {
         .name           = "i2c1",
         .class          = &omap44xx_i2c_hwmod_class,
-        .flags          = HWMOD_INIT_NO_RESET,
+        .flags          = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
         .mpu_irqs       = omap44xx_i2c1_irqs,
         .sdma_reqs      = omap44xx_i2c1_sdma_reqs,
         .main_clk       = "i2c1_fck",
@@ -2254,7 +2254,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c2_slaves[] = {
 static struct omap_hwmod omap44xx_i2c2_hwmod = {
         .name           = "i2c2",
         .class          = &omap44xx_i2c_hwmod_class,
-        .flags          = HWMOD_INIT_NO_RESET,
+        .flags          = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
         .mpu_irqs       = omap44xx_i2c2_irqs,
         .sdma_reqs      = omap44xx_i2c2_sdma_reqs,
         .main_clk       = "i2c2_fck",
@@ -2307,7 +2307,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c3_slaves[] = {
 static struct omap_hwmod omap44xx_i2c3_hwmod = {
         .name           = "i2c3",
         .class          = &omap44xx_i2c_hwmod_class,
-        .flags          = HWMOD_INIT_NO_RESET,
+        .flags          = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
         .mpu_irqs       = omap44xx_i2c3_irqs,
         .sdma_reqs      = omap44xx_i2c3_sdma_reqs,
         .main_clk       = "i2c3_fck",
@@ -2360,7 +2360,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c4_slaves[] = {
 static struct omap_hwmod omap44xx_i2c4_hwmod = {
         .name           = "i2c4",
         .class          = &omap44xx_i2c_hwmod_class,
-        .flags          = HWMOD_INIT_NO_RESET,
+        .flags          = HWMOD_16BIT_REG | HWMOD_INIT_NO_RESET,
         .mpu_irqs       = omap44xx_i2c4_irqs,
         .sdma_reqs      = omap44xx_i2c4_sdma_reqs,
         .main_clk       = "i2c4_fck",