Re: [PATCH] stmmac: Add device-tree support

[Giuseppe CAVALLARO <peppe.cavallaro@st.com>]

On 3/12/2012 3:38 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 15:05 Mon 12 Mar     , Stefan Roese wrote:
>> This patch adds support to configure the STMMAC ethernet driver via
>> device-tree instead of platform_data.
>>
>> Currently, only the properties needed on SPEAr600 are provided. All
>> other properties should be added once needed on other platforms.
>>
>> Signed-off-by: Stefan Roese <sr@denx.de>
>> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
>> Cc: Viresh Kumar <viresh.kumar@st.com>
>> ---
>>  Documentation/devicetree/bindings/net/stmmac.txt   |   38 +++++++++++
>>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   66 +++++++++++++++++++-
>>  2 files changed, 103 insertions(+), 1 deletion(-)
>>  create mode 100644 Documentation/devicetree/bindings/net/stmmac.txt
>>
>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
>> new file mode 100644
>> index 0000000..386a47f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>> @@ -0,0 +1,38 @@
>> +* STMicroelectronics 10/100/1000 Ethernet driver (GMAC)
>> +
>> +Required properties:
>> +- compatible: Should be "stm,gmac"

> this IP have 2 version at least the GMAC for the second generation and mac for
> the first generation

yes you are right. STMMAC supports two device generations I named:
dwma10/100 and dwmac1000 (gmac).

Concerning the latter, we support several different versions of the
synopsys GMAC cores ... from 3.30 to 3.61a.

For example, stx7108 and Stx7109 have the same GMAC core (also SPEAr600
IIRC).
SPEAr13xx has 3.50a
New ST SoC Stxh415 has the 3.60a. etc.

>> +- 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 STMMAC interrupts
>> +- interrupt-names: Should contain the interrupt names "macirq"
>> +  "eth_wake_irq" if this interrupt is supported in the "interrupts"
>> +  property
> optionnal

yes

note that there will be a new field for lpi IRQ as well

>> +- phy-mode: String, operation mode of the PHY interface.
>> +  Supported values are: "mii", "rmii", "gmii", "rgmii".
>> +- phy-addr: MDIO address of the PHY
>> +
>> +Optional properties:
>> +- stm,prog-burst-len: Specify the burst length
>> +- stm,has-gmac: Indicates that the controller supports 1000Mbps
> this IP support more mode 10/100/300/1000

has_gmac was used to understand on devices w/o the HW cap registers if
the core is a gmac... another useful parameter could be : enh_desc

In fact, there are several possible HW configurations:

gmac core + enh desc
gmac core + norm_desc
mac  core + norm_des

...

W/o cap register (present in new cores newer than 3.50) we need to pass
this info from the plt.

>> +- stm,has-pmt: Indicates that the controller supports power management
>> +- mac-address: 6 bytes, mac address
>> +
>> +Examples:
>> +
>> +	gmac0: stmmac@e0800000 {
>> +		compatible = "stm,gmac";
>> +		reg = <0xe0800000 0x8000>;
>> +		interrupt-parent = <&vic1>;
>> +		interrupts = <24 23>;
>> +		interrupt-names = "macirq", "eth_wake_irq";
>> +		mac-address = [000000000000]; /* Filled in by U-Boot */
>> +
>> +		stm,prog-burst-len = <8>;
>> +		stm,has-gmac;
>> +		stm,has-pmt;
>> +
>> +		phy-mode = "gmii";
>> +		phy-addr = <0>;
>> +	};
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 3aad981..fcf46c7 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -24,8 +24,43 @@
>>  
>>  #include <linux/platform_device.h>
>>  #include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/of_net.h>
>>  #include "stmmac.h"
>>  
>> +#ifdef CONFIG_OF
>> +static int __devinit stmmac_probe_config_dt(struct platform_device *pdev,
>> +					    struct plat_stmmacenet_data *plat,
>> +					    const char **mac)
>> +{
>> +	struct device_node *np = pdev->dev.of_node;
>> +
>> +	if (!np)
>> +		return -ENODEV;
>> +
>> +	*mac = of_get_mac_address(np);
>> +
>> +	plat->interface = of_get_phy_mode(np);
>> +	of_property_read_u32(np, "phy-addr", &plat->phy_addr);
>> +	plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
>> +					   sizeof(struct stmmac_mdio_bus_data),
>> +					   GFP_KERNEL);
>> +
>> +	/*
>> +	 * Currently only the properties needed on SPEAr600
>> +	 * are provided. All other properties should be added
>> +	 * once needed on other platforms.
>> +	 */
>> +	of_property_read_u32(np, "stm,prog-burst-len", &plat->pbl);
>> +	if (of_get_property(np, "stm,has-gmac", NULL))
>> +		plat->has_gmac = 1;
>> +	if (of_get_property(np, "stm,has-pmt", NULL))
>> +		plat->pmt = 1;
>> +
>> +	return 0;
>> +}
>> +#endif /* CONFIG_OF */
>> +
>>  /**
>>   * stmmac_pltfr_probe
>>   * @pdev: platform device pointer
>> @@ -39,7 +74,8 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>>  	struct resource *res;
>>  	void __iomem *addr = NULL;
>>  	struct stmmac_priv *priv = NULL;
>> -	struct plat_stmmacenet_data *plat_dat;
>> +	struct plat_stmmacenet_data *plat_dat = NULL;
>> +	const char *mac = NULL;
>>  
>>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  	if (!res)
>> @@ -58,6 +94,22 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>>  		ret = -ENOMEM;
>>  		goto out_release_region;
>>  	}
>> +
>> +#ifdef CONFIG_OF
>> +	plat_dat = devm_kzalloc(&pdev->dev, sizeof(struct plat_stmmacenet_data),
>> +				GFP_KERNEL);
>> +	if (!plat_dat) {
>> +		pr_err("%s: ERROR: no memory", __func__);
>> +		ret = -ENOMEM;
>> +		goto out_unmap;
>> +	}
>> +
>> +	ret = stmmac_probe_config_dt(pdev, plat_dat, &mac);
>> +	if (ret) {
>> +		pr_err("%s: main dt probe failed", __func__);
>> +		goto out_unmap;
>> +	}
>> +#else
> This must be check at runtime, we can boot a kernel with or without DT.
> 
> Best Reards,
> J.
>>  	plat_dat = pdev->dev.platform_data;
>>  
>>  	/* Custom initialisation (if needed)*/
>> @@ -66,6 +118,7 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>>  		if (unlikely(ret))
>>  			goto out_unmap;
>>  	}
>> +#endif
>>  
>>  	priv = stmmac_dvr_probe(&(pdev->dev), plat_dat, addr);
>>  	if (!priv) {
>> @@ -73,6 +126,10 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>>  		goto out_unmap;
>>  	}
>>  
>> +	/* Get MAC address if available (DT) */
>> +	if (mac)
>> +		memcpy(priv->dev->dev_addr, mac, ETH_ALEN);
>> +
>>  	/* Get the MAC information */
>>  	priv->dev->irq = platform_get_irq_byname(pdev, "macirq");
>>  	if (priv->dev->irq == -ENXIO) {
>> @@ -178,6 +235,12 @@ static const struct dev_pm_ops stmmac_pltfr_pm_ops = {
>>  static const struct dev_pm_ops stmmac_pltfr_pm_ops;
>>  #endif /* CONFIG_PM */
>>  
>> +static const struct of_device_id stmmac_dt_ids[] = {
>> +	{ .compatible = "stm,gmac", },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, stmmac_dt_ids);
>> +
>>  static struct platform_driver stmmac_driver = {
>>  	.probe = stmmac_pltfr_probe,
>>  	.remove = stmmac_pltfr_remove,
>> @@ -185,6 +248,7 @@ static struct platform_driver stmmac_driver = {
>>  		   .name = STMMAC_RESOURCE_NAME,
>>  		   .owner = THIS_MODULE,
>>  		   .pm = &stmmac_pltfr_pm_ops,
>> +		   .of_match_table = of_match_ptr(stmmac_dt_ids),
>>  		   },
>>  };
>>  
>> -- 
>> 1.7.9.2
>>
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