* Markus Pargmann <[email protected]> [140824 23:24]:
> This patch adds a function to get the MACIDs from the am33xx SoC
> control module registers which hold unique vendor MACIDs. This is only
> used if of_get_mac_address() fails to get a valid mac address.
>
> Signed-off-by: Markus Pargmann <[email protected]>
> Reviewed-by: Wolfram Sang <[email protected]>
> Tested-by: Steven Rostedt <[email protected]>
> ---
>
> Notes:
> Changes in v5:
> - Fixed indention
>
> Documentation/devicetree/bindings/net/cpsw.txt | 4 +++
> drivers/net/ethernet/ti/Kconfig | 2 ++
> drivers/net/ethernet/ti/cpsw.c | 43
> +++++++++++++++++++++++++-
> 3 files changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/net/cpsw.txt
> b/Documentation/devicetree/bindings/net/cpsw.txt
> index 107caf174a0e..33fe8462edf4 100644
> --- a/Documentation/devicetree/bindings/net/cpsw.txt
> +++ b/Documentation/devicetree/bindings/net/cpsw.txt
> @@ -24,6 +24,8 @@ Optional properties:
> - ti,hwmods : Must be "cpgmac0"
> - no_bd_ram : Must be 0 or 1
> - dual_emac : Specifies Switch to act as Dual EMAC
> +- syscon : Phandle to the system control device node, which is
> + the control module device of the am33x
>
> Slave Properties:
> Required properties:
> @@ -57,6 +59,7 @@ Examples:
> active_slave = <0>;
> cpts_clock_mult = <0x80000000>;
> cpts_clock_shift = <29>;
> + syscon = <&cm>;
> cpsw_emac0: slave@0 {
> phy_id = <&davinci_mdio>, <0>;
> phy-mode = "rgmii-txid";
> @@ -85,6 +88,7 @@ Examples:
> active_slave = <0>;
> cpts_clock_mult = <0x80000000>;
> cpts_clock_shift = <29>;
> + syscon = <&cm>;
> cpsw_emac0: slave@0 {
> phy_id = <&davinci_mdio>, <0>;
> phy-mode = "rgmii-txid";
> diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
> index 1769700a6070..5d8cb7956113 100644
> --- a/drivers/net/ethernet/ti/Kconfig
> +++ b/drivers/net/ethernet/ti/Kconfig
> @@ -62,6 +62,8 @@ config TI_CPSW
> select TI_DAVINCI_CPDMA
> select TI_DAVINCI_MDIO
> select TI_CPSW_PHY_SEL
> + select MFD_SYSCON
> + select REGMAP
> ---help---
> This driver supports TI's CPSW Ethernet Switch.
>
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 0bc2c2a2c236..7c94a0fb24bc 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -33,6 +33,8 @@
> #include <linux/of_net.h>
> #include <linux/of_device.h>
> #include <linux/if_vlan.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
>
> #include <linux/pinctrl/consumer.h>
>
> @@ -1816,6 +1818,39 @@ static void cpsw_slave_init(struct cpsw_slave *slave,
> struct cpsw_priv *priv,
> slave->port_vlan = data->dual_emac_res_vlan;
> }
>
> +#define AM33XX_CTRL_MAC_LO_REG(id) (0x630 + 0x8 * id)
> +#define AM33XX_CTRL_MAC_HI_REG(id) (0x630 + 0x8 * id + 0x4)
> +
> +static int cpsw_am33xx_cm_get_macid(struct device *dev, int slave,
> + u8 *mac_addr)
> +{
> + u32 macid_lo;
> + u32 macid_hi;
> + struct regmap *syscon;
> +
> + if (!of_machine_is_compatible("ti,am33xx"))
> + return 0;
> +
> + syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
> + if (IS_ERR(syscon)) {
> + if (PTR_ERR(syscon) == -ENODEV)
> + return 0;
> + return PTR_ERR(syscon);
> + }
> +
> + regmap_read(syscon, AM33XX_CTRL_MAC_LO_REG(slave), &macid_lo);
> + regmap_read(syscon, AM33XX_CTRL_MAC_HI_REG(slave), &macid_hi);
> +
> + mac_addr[5] = (macid_lo >> 8) & 0xff;
> + mac_addr[4] = macid_lo & 0xff;
> + mac_addr[3] = (macid_hi >> 24) & 0xff;
> + mac_addr[2] = (macid_hi >> 16) & 0xff;
> + mac_addr[1] = (macid_hi >> 8) & 0xff;
> + mac_addr[0] = macid_hi & 0xff;
> +
> + return 0;
> +}
I think this only works for the first instance of the cpsw?
Can the other instances of cpsw use this too and just increment
some value in it?
> static int cpsw_probe_dt(struct cpsw_platform_data *data,
> struct platform_device *pdev)
> {
> @@ -1928,8 +1963,14 @@ static int cpsw_probe_dt(struct cpsw_platform_data
> *data,
> PHY_ID_FMT, mdio->name, phyid);
>
> mac_addr = of_get_mac_address(slave_node);
> - if (mac_addr)
> + if (mac_addr) {
> memcpy(slave_data->mac_addr, mac_addr, ETH_ALEN);
> + } else {
> + ret = cpsw_am33xx_cm_get_macid(&pdev->dev, i,
> + slave_data->mac_addr);
> + if (ret)
> + return ret;
> + }
>
> slave_data->phy_if = of_get_phy_mode(slave_node);
> if (slave_data->phy_if < 0) {
The cpsw_am33xx_cm_get_macid() should only get called based on the
compatible flag to avoid random register access on other SoCs.
So how about add the of_machine_is_compatible("ti,am33xx")
check here instead and skip calling cpsw_am33xx_cm_get_macid()
otherwise?
That allows adding support for other omaps as we already have
ti,am4372-cpsw and people have pointed out issues with dra7xx
already.
Regards,
Tony
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