netdev - Re: [PATCH net-next v17 12/14] net: stmmac: dwmac-loongson: Add Loongson Multi-channels GMAC support

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Message-ID: <5fjet4giqcdsum4cm532y5lqcrplezfwjrcsysvl6vraja4iwp@xckha7yszkzd>
Date: Fri, 9 Aug 2024 20:30:49 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Yanteng Si <siyanteng@...ngson.cn>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com, 
	alexandre.torgue@...s.st.com, joabreu@...opsys.com, diasyzhang@...cent.com, 
	Jose.Abreu@...opsys.com, chenhuacai@...nel.org, linux@...linux.org.uk, 
	guyinggang@...ngson.cn, netdev@...r.kernel.org, chris.chenfeiyang@...il.com, 
	si.yanteng@...ux.dev, Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH net-next v17 12/14] net: stmmac: dwmac-loongson: Add
 Loongson Multi-channels GMAC support

On Wed, Aug 07, 2024 at 09:48:54PM +0800, Yanteng Si wrote:
> The Loongson DWMAC driver currently supports the Loongson GMAC
> devices (based on the DW GMAC v3.50a/v3.73a IP-core) installed to the
> LS2K1000 SoC and LS7A1000 chipset. But recently a new generation
> LS2K2000 SoC was released with the new version of the Loongson GMAC
> synthesized in. The new controller is based on the DW GMAC v3.73a
> IP-core with the AV-feature enabled, which implies the multi
> DMA-channels support. The multi DMA-channels feature has the next
> vendor-specific peculiarities:
> 
> 1. Split up Tx and Rx DMA IRQ status/mask bits:
>        Name              Tx          Rx
>   DMA_INTR_ENA_NIE = 0x00040000 | 0x00020000;
>   DMA_INTR_ENA_AIE = 0x00010000 | 0x00008000;
>   DMA_STATUS_NIS   = 0x00040000 | 0x00020000;
>   DMA_STATUS_AIS   = 0x00010000 | 0x00008000;
>   DMA_STATUS_FBI   = 0x00002000 | 0x00001000;
> 2. Custom Synopsys ID hardwired into the GMAC_VERSION.SNPSVER register
> field. It's 0x10 while it should have been 0x37 in accordance with
> the actual DW GMAC IP-core version.
> 3. There are eight DMA-channels available meanwhile the Synopsys DW
> GMAC IP-core supports up to three DMA-channels.
> 4. It's possible to have each DMA-channel IRQ independently delivered.
> The MSI IRQs must be utilized for that.
> 
> Thus in order to have the multi-channels Loongson GMAC controllers
> supported let's modify the Loongson DWMAC driver in accordance with
> all the peculiarities described above:
> 
> 1. Create the multi-channels Loongson GMAC-specific
>    stmmac_dma_ops::dma_interrupt()
>    stmmac_dma_ops::init_chan()
>    callbacks due to the non-standard DMA IRQ CSR flags layout.
> 2. Create the Loongson DWMAC-specific platform setup() method
> which gets to initialize the DMA-ops with the dwmac1000_dma_ops
> instance and overrides the callbacks described in 1. The method also
> overrides the custom Synopsys ID with the real one in order to have
> the rest of the HW-specific callbacks correctly detected by the driver
> core.
> 3. Make sure the platform setup() method enables the flow control and
> duplex modes supported by the controller.
> 
> Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
> Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
> Acked-by: Huacai Chen <chenhuacai@...ngson.cn>
> Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>

Looking good now. Thanks.

Reviewed-by: Serge Semin <fancer.lancer@...il.com>

-Serge(y)

> ...