From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752847AbcLHKbN (ORCPT ); Thu, 8 Dec 2016 05:31:13 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:55611 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752380AbcLHKbK (ORCPT ); Thu, 8 Dec 2016 05:31:10 -0500 Subject: Re: [PATCH v3 5/6] net: stmmac: add support for independent DMA pbl for tx/rx To: Niklas Cassel , Rob Herring , Mark Rutland , Jonathan Corbet , Giuseppe Cavallaro , "David S. Miller" , Phil Reid , Eric Engestrom , Pavel Machek , Joachim Eastwood , =?UTF-8?Q?Andreas_F=c3=a4rber?= , Vincent Palatin , Gabriel Fernandez References: <1481120409-18103-1-git-send-email-niklass@axis.com> <1481120409-18103-6-git-send-email-niklass@axis.com> CC: Niklas Cassel , , , , From: Alexandre Torgue Message-ID: Date: Thu, 8 Dec 2016 11:30:35 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <1481120409-18103-6-git-send-email-niklass@axis.com> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.48.0.2] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-12-08_05:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Niklas On 12/07/2016 03:20 PM, Niklas Cassel wrote: > From: Niklas Cassel > > GMAC and newer supports independent programmable burst lengths for > DMA tx/rx. Add new optional devicetree properties representing this. > > To be backwards compatible, snps,pbl will still be valid, but > snps,txpbl/snps,rxpbl will override the value in snps,pbl if set. > > If the IP is synthesized to use the AXI interface, there is a register > and a matching DT property inside the optional stmmac-axi-config DT node > for controlling burst lengths, named snps,blen. > However, using this register, it is not possible to control tx and rx > independently. Also, this register is not available if the IP was > synthesized with, e.g., the AHB interface. > > Signed-off-by: Niklas Cassel Thanks, you can add my Acked-by. Regards Alex > --- > Documentation/devicetree/bindings/net/stmmac.txt | 6 +++++- > Documentation/networking/stmmac.txt | 19 +++++++++++++------ > drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 12 ++++++------ > drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 12 +++++++----- > drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 ++ > include/linux/stmmac.h | 2 ++ > 6 files changed, 35 insertions(+), 18 deletions(-) > > diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt > index b95ff998ba73..8080038ff1b2 100644 > --- a/Documentation/devicetree/bindings/net/stmmac.txt > +++ b/Documentation/devicetree/bindings/net/stmmac.txt > @@ -34,7 +34,11 @@ Optional properties: > platforms. > - tx-fifo-depth: See ethernet.txt file in the same directory > - rx-fifo-depth: See ethernet.txt file in the same directory > -- snps,pbl Programmable Burst Length > +- snps,pbl Programmable Burst Length (tx and rx) > +- snps,txpbl Tx Programmable Burst Length. Only for GMAC and newer. > + If set, DMA tx will use this value rather than snps,pbl. > +- snps,rxpbl Rx Programmable Burst Length. Only for GMAC and newer. > + If set, DMA rx will use this value rather than snps,pbl. > - snps,aal Address-Aligned Beats > - snps,fixed-burst Program the DMA to use the fixed burst mode > - snps,mixed-burst Program the DMA to use the mixed burst mode > diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt > index 014f4f756cb7..6add57374f70 100644 > --- a/Documentation/networking/stmmac.txt > +++ b/Documentation/networking/stmmac.txt > @@ -153,7 +153,8 @@ Where: > o pbl: the Programmable Burst Length is maximum number of beats to > be transferred in one DMA transaction. > GMAC also enables the 4xPBL by default. > - o fixed_burst/mixed_burst/burst_len > + o txpbl/rxpbl: GMAC and newer supports independent DMA pbl for tx/rx. > + o fixed_burst/mixed_burst/aal > o clk_csr: fixed CSR Clock range selection. > o has_gmac: uses the GMAC core. > o enh_desc: if sets the MAC will use the enhanced descriptor structure. > @@ -205,16 +206,22 @@ tuned according to the HW capabilities. > > struct stmmac_dma_cfg { > int pbl; > + int txpbl; > + int rxpbl; > int fixed_burst; > - int burst_len_supported; > + int mixed_burst; > + bool aal; > }; > > Where: > - o pbl: Programmable Burst Length > + o pbl: Programmable Burst Length (tx and rx) > + o txpbl: Transmit Programmable Burst Length. Only for GMAC and newer. > + If set, DMA tx will use this value rather than pbl. > + o rxpbl: Receive Programmable Burst Length. Only for GMAC and newer. > + If set, DMA rx will use this value rather than pbl. > o fixed_burst: program the DMA to use the fixed burst mode > - o burst_len: this is the value we put in the register > - supported values are provided as macros in > - linux/stmmac.h header file. > + o mixed_burst: program the DMA to use the mixed burst mode > + o aal: Address-Aligned Beats > > --- > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c > index 318ae9f10104..99b8040af592 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c > @@ -89,20 +89,20 @@ static void dwmac1000_dma_init(void __iomem *ioaddr, > u32 dma_tx, u32 dma_rx, int atds) > { > u32 value = readl(ioaddr + DMA_BUS_MODE); > + int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl; > + int rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl; > > /* > * Set the DMA PBL (Programmable Burst Length) mode. > * > * Note: before stmmac core 3.50 this mode bit was 4xPBL, and > * post 3.5 mode bit acts as 8*PBL. > - * > - * This configuration doesn't take care about the Separate PBL > - * so only the bits: 13-8 are programmed with the PBL passed from the > - * platform. > */ > value |= DMA_BUS_MODE_MAXPBL; > - value &= ~DMA_BUS_MODE_PBL_MASK; > - value |= (dma_cfg->pbl << DMA_BUS_MODE_PBL_SHIFT); > + value |= DMA_BUS_MODE_USP; > + value &= ~(DMA_BUS_MODE_PBL_MASK | DMA_BUS_MODE_RPBL_MASK); > + value |= (txpbl << DMA_BUS_MODE_PBL_SHIFT); > + value |= (rxpbl << DMA_BUS_MODE_RPBL_SHIFT); > > /* Set the Fixed burst mode */ > if (dma_cfg->fixed_burst) > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c > index 7d82a3464097..2c3b2098f350 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c > @@ -71,11 +71,14 @@ static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi) > writel(value, ioaddr + DMA_SYS_BUS_MODE); > } > > -static void dwmac4_dma_init_channel(void __iomem *ioaddr, int pbl, > +static void dwmac4_dma_init_channel(void __iomem *ioaddr, > + struct stmmac_dma_cfg *dma_cfg, > u32 dma_tx_phy, u32 dma_rx_phy, > u32 channel) > { > u32 value; > + int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl; > + int rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl; > > /* set PBL for each channels. Currently we affect same configuration > * on each channel > @@ -85,11 +88,11 @@ static void dwmac4_dma_init_channel(void __iomem *ioaddr, int pbl, > writel(value, ioaddr + DMA_CHAN_CONTROL(channel)); > > value = readl(ioaddr + DMA_CHAN_TX_CONTROL(channel)); > - value = value | (pbl << DMA_BUS_MODE_PBL_SHIFT); > + value = value | (txpbl << DMA_BUS_MODE_PBL_SHIFT); > writel(value, ioaddr + DMA_CHAN_TX_CONTROL(channel)); > > value = readl(ioaddr + DMA_CHAN_RX_CONTROL(channel)); > - value = value | (pbl << DMA_BUS_MODE_RPBL_SHIFT); > + value = value | (rxpbl << DMA_BUS_MODE_RPBL_SHIFT); > writel(value, ioaddr + DMA_CHAN_RX_CONTROL(channel)); > > /* Mask interrupts by writing to CSR7 */ > @@ -120,8 +123,7 @@ static void dwmac4_dma_init(void __iomem *ioaddr, > writel(value, ioaddr + DMA_SYS_BUS_MODE); > > for (i = 0; i < DMA_CHANNEL_NB_MAX; i++) > - dwmac4_dma_init_channel(ioaddr, dma_cfg->pbl, > - dma_tx, dma_rx, i); > + dwmac4_dma_init_channel(ioaddr, dma_cfg, dma_tx, dma_rx, i); > } > > static void _dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 channel) > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c > index 81800f23a9c4..96afe0561c99 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c > @@ -315,6 +315,8 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac) > of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl); > if (!dma_cfg->pbl) > dma_cfg->pbl = DEFAULT_DMA_PBL; > + of_property_read_u32(np, "snps,txpbl", &dma_cfg->txpbl); > + of_property_read_u32(np, "snps,rxpbl", &dma_cfg->rxpbl); > > dma_cfg->aal = of_property_read_bool(np, "snps,aal"); > dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst"); > diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h > index 3537fb33cc90..e6d7a5940819 100644 > --- a/include/linux/stmmac.h > +++ b/include/linux/stmmac.h > @@ -88,6 +88,8 @@ struct stmmac_mdio_bus_data { > > struct stmmac_dma_cfg { > int pbl; > + int txpbl; > + int rxpbl; > int fixed_burst; > int mixed_burst; > bool aal; >