[U-Boot] [PATCH v2 1/5] ARM: arch-meson: add ethernet common init function

[Neil Armstrong]

On 26/11/2017 12:39, Simon Glass wrote:
> Hi Neil,
> 
> On 25 November 2017 at 02:45, Neil Armstrong <narmstrong at baylibre.com> wrote:
>> Hi Simon,
>>
>> Le 24/11/2017 23:35, Simon Glass a écrit :
>>> Hi Neil,
>>>
>>> On 22 November 2017 at 06:25, Neil Armstrong <narmstrong at baylibre.com> wrote:
>>>> Introduce a generic common Ethernet Hardware init function
>>>> common to all Amlogic GX SoCs with support for the
>>>> Internal PHY enable for GXL SoCs.
>>>>
>>>> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
>>>> ---
>>>>  arch/arm/include/asm/arch-meson/eth.h | 15 ++++++++++
>>>>  arch/arm/mach-meson/Makefile          |  2 +-
>>>>  arch/arm/mach-meson/eth.c             | 53 +++++++++++++++++++++++++++++++++++
>>>>  3 files changed, 69 insertions(+), 1 deletion(-)
>>>>  create mode 100644 arch/arm/include/asm/arch-meson/eth.h
>>>>  create mode 100644 arch/arm/mach-meson/eth.c
>>>>
>>>> diff --git a/arch/arm/include/asm/arch-meson/eth.h b/arch/arm/include/asm/arch-meson/eth.h
>>>> new file mode 100644
>>>> index 0000000..8ea8e10
>>>> --- /dev/null
>>>> +++ b/arch/arm/include/asm/arch-meson/eth.h
>>>> @@ -0,0 +1,15 @@
>>>> +/*
>>>> + * Copyright (C) 2016 BayLibre, SAS
>>>> + * Author: Neil Armstrong <narmstrong at baylibre.com>
>>>> + *
>>>> + * SPDX-License-Identifier:    GPL-2.0+
>>>> + */
>>>> +
>>>> +#ifndef __MESON_ETH_H__
>>>> +#define __MESON_ETH_H__
>>>> +
>>>> +#include <phy.h>
>>>> +
>>>> +void meson_gx_eth_init(phy_interface_t mode, bool use_internal_phy);
>>>> +
>>>> +#endif /* __MESON_ETH_H__ */
>>>> diff --git a/arch/arm/mach-meson/Makefile b/arch/arm/mach-meson/Makefile
>>>> index bf49b8b..b4e8dde 100644
>>>> --- a/arch/arm/mach-meson/Makefile
>>>> +++ b/arch/arm/mach-meson/Makefile
>>>> @@ -4,4 +4,4 @@
>>>>  # SPDX-License-Identifier:     GPL-2.0+
>>>>  #
>>>>
>>>> -obj-y += board.o sm.o
>>>> +obj-y += board.o sm.o eth.o
>>>> diff --git a/arch/arm/mach-meson/eth.c b/arch/arm/mach-meson/eth.c
>>>> new file mode 100644
>>>> index 0000000..46ecb5e
>>>> --- /dev/null
>>>> +++ b/arch/arm/mach-meson/eth.c
>>>> @@ -0,0 +1,53 @@
>>>> +/*
>>>> + * Copyright (C) 2016 BayLibre, SAS
>>>> + * Author: Neil Armstrong <narmstrong at baylibre.com>
>>>> + *
>>>> + * SPDX-License-Identifier:    GPL-2.0+
>>>> + */
>>>> +
>>>> +#include <common.h>
>>>> +#include <dm.h>
>>>> +#include <asm/io.h>
>>>> +#include <asm/arch/gxbb.h>
>>>> +#include <asm/arch/eth.h>
>>>> +#include <phy.h>
>>>> +
>>>> +void meson_gx_eth_init(phy_interface_t mode, bool use_internal_phy)
>>>
>>> Can you add a header file addition for this somewhere, with comments?
>>
>> Do you mean comments in the added arch/arm/include/asm/arch-meson/eth.h in this
>> same patchset ?
> 
> Yes that's what I meant.
> 
>>
>>>
>>>> +{
>>>> +       switch (mode) {
>>>> +       case PHY_INTERFACE_MODE_RGMII:
>>>> +       case PHY_INTERFACE_MODE_RGMII_ID:
>>>> +       case PHY_INTERFACE_MODE_RGMII_RXID:
>>>> +       case PHY_INTERFACE_MODE_RGMII_TXID:
>>>> +               /* Set RGMII mode */
>>>> +               setbits_le32(GXBB_ETH_REG_0, GXBB_ETH_REG_0_PHY_INTF |
>>>> +                            GXBB_ETH_REG_0_TX_PHASE(1) |
>>>> +                            GXBB_ETH_REG_0_TX_RATIO(4) |
>>>> +                            GXBB_ETH_REG_0_PHY_CLK_EN |
>>>> +                            GXBB_ETH_REG_0_CLK_EN);
>>>> +               break;
>>>> +
>>>> +       case PHY_INTERFACE_MODE_RMII:
>>>> +               /* Set RMII mode */
>>>> +               out_le32(GXBB_ETH_REG_0, GXBB_ETH_REG_0_INVERT_RMII_CLK |
>>>> +                                        GXBB_ETH_REG_0_CLK_EN);
>>>
>>> How come this is using out_le32() instead of (for example) writel()?
>>
>> It should be writel(), but since the register size is 32bit, it can be out_le32
> 
> So why do we have out_le32()? What is the difference?
> 
>>
>>>
>>>> +
>>>> +#ifdef CONFIG_MESON_GXL
>>>
>>> This doesn't seem fully generic if it has this #ifdef in it. Can this
>>> be a parameter? At worst can we use if() instead of #ifdef ?
>>
>> Yeah, I didn't really figured out how to specify the internal PHY.
>>
>> GXL and GXM SoCs have an internal PHY, but yeah GXBB does't.
>> I hesitated to add a different meson_gx_eth_init() signature
>> for these different SoCs, what do you think about that ?
>>
>> The new AXG SoC does not have internal PHY, so it will use the same
>> code as GXBB.
> 
> I think this function needs to be told which SoC type it is dealing
> with, as a separate enum parameters.

It's more complex since the S905D from the same GXL family can also use an
external RGMII interface *and* the internal PHY depending on the board.

Could a generic flags parameter be better, and add a GXL specific
MESON_GXL_USE_INTERNAL_RMII_PHY to be passed only on GXL platforms ?

> 
>>
>>>
>>>> +               if (use_internal_phy) {
>>>> +                       /* Use Internal PHY */
>>>> +                       out_le32(GXBB_ETH_REG_2, 0x10110181);
>>>> +                       out_le32(GXBB_ETH_REG_3, 0xe40908ff);
>>>> +               }
>>>> +#endif
>>>> +
>>>> +               break;
>>>> +
>>>> +       default:
>>>> +               printf("Invalid Ethernet interface mode\n");
>>>> +               return;
>>>> +       }
>>>> +
>>>> +       /* Enable power and clock gate */
>>>> +       setbits_le32(GXBB_GCLK_MPEG_1, GXBB_GCLK_MPEG_1_ETH);
>>>> +       clrbits_le32(GXBB_MEM_PD_REG_0, GXBB_MEM_PD_REG_0_ETH_MASK);
>>>
>>> Seems like this should be in a clock driver.
>>
>> It should, in next release ? Beniamino's I2C driver also used this,
>> but yes a proper clock driver becomes necessary here.
> 
> OK.
> Regards,
> 
> Simon
>