[U-Boot] [PATCH v2 3/3] arm: odroid: usb: add support for usb host including ethernet

[Minkyu Kang <mk7.kang@samsung.com>]

Dear Suriyan Ramasami,

On 25/10/14 01:08, Suriyan Ramasami wrote:
> Hello Minkyu Kang,
> 
> 
> On Thu, Oct 23, 2014 at 9:58 PM, Minkyu Kang <mk7.kang@samsung.com> wrote:
>> Dear Suriyan Ramasami,
>>
>> On 21/10/14 02:52, Suriyan Ramasami wrote:
>>> This change adds support for enabling the USB host features of the board.
>>> This includes the USB3503A hub and the SMC LAN9730 ethernet controller
>>> as well.
>>>
>>> Credit goes to Tushar Berara for the function set_usb_ethaddr().
>>>
>>> Signed-off-by: Suriyan Ramasami <suriyan.r@gmail.com>
>>>
>>> ---
>>> v2:
>>>  * Removed an unneeded header file from ehci-exynos.c
>>>  * Fix indentation in the dts file
>>> ---
>>>  arch/arm/dts/exynos4412-odroid.dts      | 11 +++++++
>>>  arch/arm/include/asm/arch-exynos/cpu.h  |  2 ++
>>>  arch/arm/include/asm/arch-exynos/ehci.h | 13 ++++++++
>>>  board/samsung/odroid/odroid.c           | 55 +++++++++++++++++++++++++++++++++
>>>  drivers/usb/host/ehci-exynos.c          | 51 +++++++++++++++++++++++++-----
>>>  include/configs/odroid.h                | 13 ++++++++
>>>  6 files changed, 137 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/arch/arm/dts/exynos4412-odroid.dts b/arch/arm/dts/exynos4412-odroid.dts
>>> index 24d0bf1..ac5fece 100644
>>> --- a/arch/arm/dts/exynos4412-odroid.dts
>>> +++ b/arch/arm/dts/exynos4412-odroid.dts
>>> @@ -67,4 +67,15 @@
>>>               div = <0x3>;
>>>               index = <4>;
>>>       };
>>> +
>>> +     ehci at 12580000 {
>>> +             compatible = "samsung,exynos-ehci";
>>> +             reg = <0x12580000 0x100>;
>>> +             #address-cells = <1>;
>>> +             #size-cells = <1>;
>>> +             phy {
>>> +                     compatible = "samsung,exynos-usb-phy";
>>> +                     reg = <0x125B0000 0x100>;
>>> +             };
>>> +     };
>>>  };
>>> diff --git a/arch/arm/include/asm/arch-exynos/cpu.h b/arch/arm/include/asm/arch-exynos/cpu.h
>>> index ba71714..fda21fb 100644
>>> --- a/arch/arm/include/asm/arch-exynos/cpu.h
>>> +++ b/arch/arm/include/asm/arch-exynos/cpu.h
>>> @@ -18,6 +18,8 @@
>>>
>>>  #define EXYNOS4_GPIO_PART3_BASE              0x03860000
>>>  #define EXYNOS4_PRO_ID                       0x10000000
>>> +#define EXYNOS4_GUID_LOW             0x10000014
>>> +#define EXYNOS4_GUID_HIGH            0x10000018
>>>  #define EXYNOS4_SYSREG_BASE          0x10010000
>>>  #define EXYNOS4_POWER_BASE           0x10020000
>>>  #define EXYNOS4_SWRESET                      0x10020400
>>> diff --git a/arch/arm/include/asm/arch-exynos/ehci.h b/arch/arm/include/asm/arch-exynos/ehci.h
>>> index d2d70bd..3800fa9 100644
>>> --- a/arch/arm/include/asm/arch-exynos/ehci.h
>>> +++ b/arch/arm/include/asm/arch-exynos/ehci.h
>>> @@ -12,6 +12,13 @@
>>>
>>>  #define CLK_24MHZ            5
>>>
>>> +#define PHYPWR_NORMAL_MASK_PHY0                 (0x39 << 0)
>>> +#define PHYPWR_NORMAL_MASK_PHY1                 (0x7 << 6)
>>> +#define PHYPWR_NORMAL_MASK_HSIC0                (0x7 << 9)
>>> +#define PHYPWR_NORMAL_MASK_HSIC1                (0x7 << 12)
>>> +#define RSTCON_HOSTPHY_SWRST                    (0xf << 3)
>>> +#define RSTCON_SWRST                            (0x1 << 0)
>>> +
>>>  #define HOST_CTRL0_PHYSWRSTALL                       (1 << 31)
>>>  #define HOST_CTRL0_COMMONON_N                        (1 << 9)
>>>  #define HOST_CTRL0_SIDDQ                     (1 << 6)
>>> @@ -61,6 +68,12 @@ struct exynos_usb_phy {
>>>       unsigned int usbotgtune;
>>>  };
>>>
>>> +struct exynos4412_usb_phy {
>>> +     unsigned int usbphyctrl;
>>> +     unsigned int usbphyclk;
>>> +     unsigned int usbphyrstcon;
>>> +};
>>> +
>>>  /* Switch on the VBUS power. */
>>>  int board_usb_vbus_init(void);
>>>
>>> diff --git a/board/samsung/odroid/odroid.c b/board/samsung/odroid/odroid.c
>>> index 5edb250..6c78b67 100644
>>> --- a/board/samsung/odroid/odroid.c
>>> +++ b/board/samsung/odroid/odroid.c
>>> @@ -453,9 +453,64 @@ struct s3c_plat_otg_data s5pc210_otg_data = {
>>>       .usb_phy_ctrl   = EXYNOS4X12_USBPHY_CONTROL,
>>>       .usb_flags      = PHY0_SLEEP,
>>>  };
>>> +#endif
>>> +
>>> +#if defined(CONFIG_USB_GADGET) || defined(CONFIG_CMD_USB)
>>> +
>>> +#ifdef CONFIG_CMD_USB
>>> +static void set_usb_ethaddr(void)
>>> +{
>>> +     int i;
>>> +     uchar mac[6];
>>> +     unsigned int guid_high = readl(EXYNOS4_GUID_HIGH);
>>> +     unsigned int guid_low = readl(EXYNOS4_GUID_LOW);
>>
>> We don't allow direct access.
>> Is it special register? I can't find this register on TRM.
>> If so you can make inline function at cpu.h instead.
>>
> 
> This register is not in the TRM. This register is possibly documented
> in the TRM for the Exynos5250. Through experimentation I found that it
> behaves the same on Exynos4412 prime as well - I checked this with one
> X2, 1 U2 and 2 U3s, and they do indeed do the job of being unique and
> hence can be used to generate the mac address which will be unique
> across all U2s/U3s/X2s and possibly other Exynos SoCs like Exynos4212
> etc.
> 
> Regarding direct access, I am a bit confused. In odroid.c I see quite
> a many places which is doing a readl() of registers. Here we are
> readl(addr) into guid_* similarly, and cooking up a mac address in a
> local char array.
> 
> I fail to see your point. Can you please elaborate more, so I can comprehend?
> 

Samsung SoCs always get the address of register using accessor functions(samsung_get_base_xxx).

Thanks,
Minkyu Kang.