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

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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>
This commit is contained in:
Andy Green 2011-07-10 05:27:14 -06:00 committed by Paul Walmsley
parent da7cdfac1b
commit 3e60052211
3 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/mach-omap2/omap_hwmod_2430_data.c
View File

@ -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",

3
arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
View File

@ -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",

8
arch/arm/mach-omap2/omap_hwmod_44xx_data.c
View File

@ -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",