[PATCH] ARM: tegra/harmony: enable USB host ports

The Harmony board code doesn't have any support for USB, leaving
the board without any ethernet support. Add the necessary
declarations to have it up and running, at least for the J6 and J25
connectors, as well as the ethernet port.

The OTG port is left unused, short of any documentation.

Cc: Stephen Warren <redacted>
Cc: Olof Johansson <redacted>
Signed-off-by: Marc Zyngier <redacted>
---
Not sure if this is the right time to send this, as this should
eventually be handled by the device tree. May be useful to some
people in the meantime.

Patch against v3.0-rc2.

 arch/arm/mach-tegra/board-harmony.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-tegra/board-harmony.c b/arch/arm/mach-tegra/board-harmony.c
index 30e18bc..b95156a 100644
--- a/arch/arm/mach-tegra/board-harmony.c
+++ b/arch/arm/mach-tegra/board-harmony.c

@@ -26,6 +26,7 @@
 #include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/i2c-tegra.h>
+#include <linux/platform_data/tegra_usb.h>
 
 #include <sound/wm8903.h>
 

@@ -143,6 +144,8 @@ static struct platform_device *harmony_devices[] __initdata = {
 	&tegra_das_device,
 	&tegra_pcm_device,
 	&harmony_audio_device,
+	&tegra_ehci1_device,
+	&tegra_ehci3_device,
 };
 
 static void __init tegra_harmony_fixup(struct machine_desc *desc,

@@ -185,6 +188,10 @@ static struct tegra_sdhci_platform_data sdhci_pdata4 = {
 	.is_8bit	= 1,
 };
 
+static struct tegra_ehci_platform_data ehci_data = {
+	.operating_mode = TEGRA_USB_HOST,
+};
+
 static void __init tegra_harmony_init(void)
 {
 	tegra_clk_init_from_table(harmony_clk_init_table);

@@ -195,6 +202,9 @@ static void __init tegra_harmony_init(void)
 	tegra_sdhci_device2.dev.platform_data = &sdhci_pdata2;
 	tegra_sdhci_device4.dev.platform_data = &sdhci_pdata4;
 
+	tegra_ehci1_device.dev.platform_data = &ehci_data;
+	tegra_ehci3_device.dev.platform_data = &ehci_data;
+
 	platform_add_devices(harmony_devices, ARRAY_SIZE(harmony_devices));
 	harmony_i2c_init();
 	harmony_regulator_init();

-- 
1.7.0.4

Marc Zyngier wrote at Wednesday, June 08, 2011 4:14 AM:

The Harmony board code doesn't have any support for USB, leaving
the board without any ethernet support. Add the necessary
declarations to have it up and running, at least for the J6 and J25
connectors, as well as the ethernet port.

The OTG port is left unused, short of any documentation.

Cc: Stephen Warren <redacted>
Cc: Olof Johansson <redacted>
Signed-off-by: Marc Zyngier <redacted>
---
Not sure if this is the right time to send this, as this should
eventually be handled by the device tree. May be useful to some
people in the meantime.

I believe Colin isn't accepting board changes for this kernel merge
window. I'm not sure what plans are after that. Perhaps device tree?

In the ChromeOS 2.6.38 kernel, the following platform data definitions
are used for tegra_ehci3_device:

+static struct tegra_utmip_config utmi_phy_config = {
+       .hssync_start_delay = 0,
+       .idle_wait_delay = 17,
+       .elastic_limit = 16,
+       .term_range_adj = 6,
+       .xcvr_setup = 9,
+       .xcvr_lsfslew = 2,
+       .xcvr_lsrslew = 2,
+};
+
+static struct tegra_ehci_platform_data tegra_ehci_pdata = {
+       .phy_config = &utmi_phy_config,
+       .operating_mode = TEGRA_USB_HOST,
+       .power_down_on_bus_suspend = 1,
+};

And also this clock is configured:

+       { "usb3",       "clk_m",        12000000,       true },

I'm not sure if that platform data is appropriate for tegra_ehci1_device;
the ChromeOS kernel doesn't enable that port.

You can find that at either:

http://git.chromium.org/chromiumos/third_party/kernel.git

or commit 0d7ae83b763bb3727e6b6189b49925cd3ab2e204
http://avon.wwwdotorg.org/downloads/kernel.git asoc_for-2.6.40_plus_harmony

-- 
nvpublic

On 08/06/11 17:48, Stephen Warren wrote:

Marc Zyngier wrote at Wednesday, June 08, 2011 4:14 AM:

quoted

The Harmony board code doesn't have any support for USB, leaving
the board without any ethernet support. Add the necessary
declarations to have it up and running, at least for the J6 and J25
connectors, as well as the ethernet port.

The OTG port is left unused, short of any documentation.

Cc: Stephen Warren <redacted>
Cc: Olof Johansson <redacted>
Signed-off-by: Marc Zyngier <redacted>
---
Not sure if this is the right time to send this, as this should
eventually be handled by the device tree. May be useful to some
people in the meantime.

I believe Colin isn't accepting board changes for this kernel merge
window. I'm not sure what plans are after that. Perhaps device tree?

Oh, I wasn't thinking of merging anything like that for 3.0 or 3.1. USB
on Tegra has been unsupported in mainline until now, and it can
certainly wait for another merge window. Even better if that involves
the device tree.

In the ChromeOS 2.6.38 kernel, the following platform data definitions
are used for tegra_ehci3_device:

+static struct tegra_utmip_config utmi_phy_config = {
+       .hssync_start_delay = 0,
+       .idle_wait_delay = 17,
+       .elastic_limit = 16,
+       .term_range_adj = 6,
+       .xcvr_setup = 9,
+       .xcvr_lsfslew = 2,
+       .xcvr_lsrslew = 2,
+};

This looks like the defaults provided by usb_phy.c (except for
hssync_start_delay, which is set to 9). I assume this should be safe.

+static struct tegra_ehci_platform_data tegra_ehci_pdata = {
+       .phy_config = &utmi_phy_config,
+       .operating_mode = TEGRA_USB_HOST,
+       .power_down_on_bus_suspend = 1,

           ^^^^^^^^
This last bit could be useful indeed.

+};

And also this clock is configured:

+       { "usb3",       "clk_m",        12000000,       true },

I think we have that one as well (tegra2_clocks.c), though at a
different rate (!).

I'm not sure if that platform data is appropriate for tegra_ehci1_device;
the ChromeOS kernel doesn't enable that port.

There's probably some kind of GPIO trickery involved to reset the port...

You can find that at either:

http://git.chromium.org/chromiumos/third_party/kernel.git

or commit 0d7ae83b763bb3727e6b6189b49925cd3ab2e204
http://avon.wwwdotorg.org/downloads/kernel.git asoc_for-2.6.40_plus_harmony

Thanks for the pointers.

Cheers,

	M.
-- 
Jazz is not dead. It just smells funny...

On Wed, Jun 8, 2011 at 8:13 PM, Marc Zyngier [off-list ref] wrote:

quoted

I'm not sure if that platform data is appropriate for tegra_ehci1_device;
the ChromeOS kernel doesn't enable that port.

There's probably some kind of GPIO trickery involved to reset the port...

I don't think it's possible to enable port 1 in host mode on
harmony... As far as I remember, port 1 is routed to mini-B connector
and there's nothing that would supply Vbus in the host mode...

quoted

You can find that at either:

http://git.chromium.org/chromiumos/third_party/kernel.git

or commit 0d7ae83b763bb3727e6b6189b49925cd3ab2e204
http://avon.wwwdotorg.org/downloads/kernel.git asoc_for-2.6.40_plus_harmony

Thanks for the pointers.

Cheers,

? ? ? ?M.
--
Jazz is not dead. It just smells funny...

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--
Sincerely Yours,
Mike.

Mike Rapoport wrote at Thursday, June 09, 2011 12:53 AM:

On Wed, Jun 8, 2011 at 8:13 PM, Marc Zyngier [off-list ref] wrote:

quoted

quoted

I'm not sure if that platform data is appropriate for tegra_ehci1_device;
the ChromeOS kernel doesn't enable that port.

There's probably some kind of GPIO trickery involved to reset the
port...

I don't think it's possible to enable port 1 in host mode on
harmony... As far as I remember, port 1 is routed to mini-B connector
and there's nothing that would supply Vbus in the host mode...

Yes, looking at the schematic, I don't think I can see anything to drive
5v onto that connector, just detect whether it's there. For the other 3
USB ports, there's clearly something to drive 5v based on a signal from
the LAN/USB hub chip.

-- 
nvpublic