net: cpsw: Add am33xx MACID readout
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 <mpa@pengutronix.de>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
index 107caf1..33fe846 100644
--- a/Documentation/devicetree/bindings/net/cpsw.txt
+++ b/Documentation/devicetree/bindings/net/cpsw.txt
@@ -24,6 +24,8 @@
- 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 @@
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 @@
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 1769700..5d8cb79 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -62,6 +62,8 @@
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 d2988ae..ab167dc 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>
@@ -1876,6 +1878,36 @@
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;
+
+ 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;
+}
+
static int cpsw_probe_dt(struct cpsw_platform_data *data,
struct platform_device *pdev)
{
@@ -1988,8 +2020,16 @@
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 {
+ if (of_machine_is_compatible("ti,am33xx")) {
+ 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) {