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Date: Wed, 12 Mar 2014 15:10:08 +0000
From: Mark Rutland <mark.rutland@....com>
To: Byungho An <bh74.an@...sung.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"siva.kallam@...sung.com" <siva.kallam@...sung.com>,
"vipul.pandya@...sung.com" <vipul.pandya@...sung.com>,
"ks.giri@...sung.com" <ks.giri@...sung.com>,
"ilho215.lee@...sung.com" <ilho215.lee@...sung.com>
Subject: Re: [PATCH V2 1/7] net: sxgbe: add basic framework for Samsung
10Gb ethernet driver
On Wed, Mar 12, 2014 at 01:28:00PM +0000, Byungho An wrote:
> From: Siva Reddy <siva.kallam@...sung.com>
>
> This patch adds support for Samsung 10Gb ethernet driver(sxgbe).
>
> - sxgbe core initialization
> - Tx and Rx support
> - MDIO support
> - ISRs for Tx and Rx
> - ifconfig support to driver
>
> Signed-off-by: Siva Reddy Kallam <siva.kallam@...sung.com>
> Signed-off-by: Vipul Pandya <vipul.pandya@...sung.com>
> Signed-off-by: Girish K S <ks.giri@...sung.com>
> Neatening-by: Joe Perches <joe@...ches.com>
> Signed-off-by: Byungho An <bh74.an@...sung.com>
> ---
[...]
> diff --git a/Documentation/devicetree/bindings/net/samsung-sxgbe.txt
> b/Documentation/devicetree/bindings/net/samsung-sxgbe.txt
> new file mode 100644
> index 0000000..f2abf65
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/samsung-sxgbe.txt
Please split the binding into a separate patch from the code (it makes
it far easier for us DT guys to find that portions relevant to use).
Is there any public documentation?
> @@ -0,0 +1,39 @@
> +* Samsung 10G Ethernet driver (SXGBE)
> +
> +Required properties:
> +- compatible: Should be "samsung,sxgbe-v2.0a"
> +- reg: Address and length of the register set for the device
> +- interrupt-parent: Should be the phandle for the interrupt controller
> + that services interrupts for this device
> +- interrupts: Should contain the SXGBE interrupts
How many, in which order, what are each of them for?
> +- samsung,burst-map Program the possible bursts supported by sxgbe
> +- samsung,fixed-burst Program the DMA to use the fixed burst mode
> +- samsung,adv-addr-mode program the DMA to use Enhanced address mode
What are valid values?
Units/types?
Please describe what these actually do.
> +- samsung,force_thresh_dma_mode Force DMA to use the threshold mode
> for
> + both tx and rx
Odd formatting here.
s/_/-/ in property names please.
When and why should this property be set in a dt?
> +- samsung,force_sf_dma_mode Force DMA to use the Store and Forward
> + mode for both tx and rx. This flag is
> + ignored if force_thresh_dma_mode is set.
Likewise, for all points.
[...]
> +/* Clean the tx descriptor as soon as the tx irq is received */
> +static void sxgbe_release_tx_desc(struct sxgbe_tx_norm_desc *p)
> +{
> + memset(p, 0, sizeof(struct sxgbe_tx_norm_desc));
You can use sizeof(*p) here.
[...]
> +static int sxgbe_probe_config_dt(struct platform_device *pdev,
> + struct sxgbe_plat_data *plat,
> + const char **mac)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct sxgbe_dma_cfg *dma_cfg;
> + u32 phy_addr;
> +
> + if (!np)
> + return -ENODEV;
> +
> + *mac = of_get_mac_address(np);
I see that of_get_mac_address returns a *void rather than *char, but
it's always a string of hex digits. Would it make sense to change the
of_get_mac_address prototype to return a char* ?
> + plat->interface = of_get_phy_mode(np);
> +
> + plat->bus_id = of_alias_get_id(np, "ethernet");
> + if (plat->bus_id < 0)
> + plat->bus_id = 0;
This wasn't mentioned in the binding.
> +
> + of_property_read_u32(np, "samsung,phy-addr", &plat->phy_addr);
Neither was this.
> +
> + plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
> + sizeof(struct
> sxgbe_mdio_bus_data),
> + GFP_KERNEL);
> +
> + if (of_device_is_compatible(np, "samsung,sxgbe-v2.0a"))
> + plat->pmt = 1;
Only one compatible string is documented. When would this _not_ be the
case?
[...]
> +static int sxgbe_platform_probe(struct platform_device *pdev)
> +{
> + int ret = 0;
> + int loop = 0;
> + int index1, index2;
> + struct resource *res;
> + struct device *dev = &pdev->dev;
> + void __iomem *addr = NULL;
> + struct sxgbe_priv_data *priv = NULL;
> + struct sxgbe_plat_data *plat_dat = NULL;
> + const char *mac = NULL;
> + int total_dma_channels = SXGBE_TX_QUEUES + SXGBE_RX_QUEUES;
> +
> + /* Get memory resource */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENODEV;
> +
> + addr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(addr))
> + return PTR_ERR(addr);
> +
> + plat_dat = pdev->dev.platform_data;
This is a new dt-driven driver. Why would you need additional platform
data? Why can this information not come from dt?
> + if (pdev->dev.of_node) {
> + if (!plat_dat)
> + plat_dat = devm_kzalloc(&pdev->dev,
> + sizeof(struct
> sxgbe_plat_data),
> + GFP_KERNEL);
> + if (!plat_dat)
> + return -ENOMEM;
> +
> + ret = sxgbe_probe_config_dt(pdev, plat_dat, &mac);
> + if (ret) {
> + pr_err("%s: main dt probe failed\n", __func__);
> + return ret;
> + }
> + }
> +
> + priv = sxgbe_dvr_probe(&(pdev->dev), plat_dat, addr);
> + if (!priv) {
> + pr_err("%s: main driver probe failed\n", __func__);
> + return -ENODEV;
> + }
> +
> + /* Get MAC address if available (DT) */
> + if (mac)
> + ether_addr_copy(priv->dev->dev_addr, mac);
> +
> + /* Get the SXGBE common INT information */
> + priv->dev->irq = irq_of_parse_and_map(dev->of_node, loop++);
> + if (priv->dev->irq <= 0) {
> + dev_err(dev, "sxgbe common irq parsing failed\n");
> + return -EINVAL;
> + }
So the first IRQ is assumed to be a common interrupt...
> +
> + /* Get the TX/RX IRQ numbers */
> + for (index1 = 0, index2 = 0 ; loop < total_dma_channels; loop++) {
> + if (loop < SXGBE_TX_QUEUES) {
> + (priv->txq[index1])->irq_no =
> + irq_of_parse_and_map(dev->of_node, loop);
then there's a TX IRQ for each queue, in order...
> + if ((priv->txq[index1++])->irq_no <= 0) {
> + dev_err(dev, "sxgbe tx irq parsing
> failed\n");
> + return -EINVAL;
> + }
> + } else {
> + (priv->rxq[index2])->irq_no =
> + irq_of_parse_and_map(dev->of_node, loop);
then an RX IRQ for each queue, in order.
That should be in the binding document.
Cheers,
Mark.
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