drivers: net: cpsw: add support for reading mac address from efuse

Different TI platforms has to read with different combination to
get the mac address from efuse. So add support to read mac address
based on machine/device compatibles.

The code is taken from Linux drivers/net/ethernet/ti/cpsw-common.c
done by Tony Lindgren.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/net/cpsw-common.c b/drivers/net/cpsw-common.c
new file mode 100644
index 0000000000..e828e85d8b
--- /dev/null
+++ b/drivers/net/cpsw-common.c
@@ -0,0 +1,121 @@
+/*
+ * CPSW common - libs used across TI ethernet devices.
+ *
+ * Copyright (C) 2016, Texas Instruments, Incorporated
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdt_support.h>
+#include <asm/io.h>
+#include <cpsw.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define CTRL_MAC_REG(offset, id) ((offset) + 0x8 * (id))
+
+static int davinci_emac_3517_get_macid(struct udevice *dev, u16 offset,
+				       int slave, u8 *mac_addr)
+{
+	void *fdt = (void *)gd->fdt_blob;
+	int node = dev->of_offset;
+	u32 macid_lsb;
+	u32 macid_msb;
+	fdt32_t gmii = 0;
+	int syscon;
+	u32 addr;
+
+	syscon = fdtdec_lookup_phandle(fdt, node, "syscon");
+	if (syscon < 0) {
+		error("Syscon offset not found\n");
+		return -ENOENT;
+	}
+
+	addr = (u32)map_physmem(fdt_translate_address(fdt, syscon, &gmii),
+				sizeof(u32), MAP_NOCACHE);
+	if (addr == FDT_ADDR_T_NONE) {
+		error("Not able to get syscon address to get mac efuse address\n");
+		return -ENOENT;
+	}
+
+	addr += CTRL_MAC_REG(offset, slave);
+
+	/* try reading mac address from efuse */
+	macid_lsb = readl(addr);
+	macid_msb = readl(addr + 4);
+
+	mac_addr[0] = (macid_msb >> 16) & 0xff;
+	mac_addr[1] = (macid_msb >> 8)  & 0xff;
+	mac_addr[2] = macid_msb & 0xff;
+	mac_addr[3] = (macid_lsb >> 16) & 0xff;
+	mac_addr[4] = (macid_lsb >> 8)  & 0xff;
+	mac_addr[5] = macid_lsb & 0xff;
+
+	return 0;
+}
+
+static int cpsw_am33xx_cm_get_macid(struct udevice *dev, u16 offset, int slave,
+				    u8 *mac_addr)
+{
+	void *fdt = (void *)gd->fdt_blob;
+	int node = dev->of_offset;
+	u32 macid_lo;
+	u32 macid_hi;
+	fdt32_t gmii = 0;
+	int syscon;
+	u32 addr;
+
+	syscon = fdtdec_lookup_phandle(fdt, node, "syscon");
+	if (syscon < 0) {
+		error("Syscon offset not found\n");
+		return -ENOENT;
+	}
+
+	addr = (u32)map_physmem(fdt_translate_address(fdt, syscon, &gmii),
+				sizeof(u32), MAP_NOCACHE);
+	if (addr == FDT_ADDR_T_NONE) {
+		error("Not able to get syscon address to get mac efuse address\n");
+		return -ENOENT;
+	}
+
+	addr += CTRL_MAC_REG(offset, slave);
+
+	/* try reading mac address from efuse */
+	macid_lo = readl(addr);
+	macid_hi = readl(addr + 4);
+
+	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;
+}
+
+int ti_cm_get_macid(struct udevice *dev, int slave, u8 *mac_addr)
+{
+	if (of_machine_is_compatible("ti,dm8148"))
+		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
+
+	if (of_machine_is_compatible("ti,am33xx"))
+		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
+
+	if (of_device_is_compatible(dev, "ti,am3517-emac"))
+		return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);
+
+	if (of_device_is_compatible(dev, "ti,dm816-emac"))
+		return cpsw_am33xx_cm_get_macid(dev, 0x30, slave, mac_addr);
+
+	if (of_machine_is_compatible("ti,am4372"))
+		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
+
+	if (of_machine_is_compatible("ti,dra7"))
+		return davinci_emac_3517_get_macid(dev, 0x514, slave, mac_addr);
+
+	dev_err(dev, "incompatible machine/device type for reading mac address\n");
+	return -ENOENT;
+}