1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/brcm/mdio/mdio.c b/drivers/brcm/mdio/mdio.c
new file mode 100644
index 0000000..1cf9d66
--- /dev/null
+++ b/drivers/brcm/mdio/mdio.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2016 - 2021, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <string.h>
+
+#include <platform_def.h>
+
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <lib/mmio.h>
+#include <mdio.h>
+
+static int mdio_op_status(uint32_t result)
+{
+	uint32_t timeout = 1000000U; /* loop for 1s */
+	uint32_t val;
+
+	do {
+		val = mmio_read_32(CMIC_MIIM_STAT);
+		if ((val & MDIO_STAT_DONE) == result) {
+			return 0;
+		}
+
+		udelay(1U);
+	} while (timeout-- != 0U);
+	return -1;
+}
+
+static int mdio_op(uint16_t busid, uint16_t phyid, uint32_t reg,
+	       uint16_t val, uint8_t op)
+{
+	uint32_t param;
+	int ret;
+
+	mmio_write_32(CMIC_MIIM_CTRL, 0U);
+	ret = mdio_op_status(0U);
+	if (ret != 0) {
+		goto err;
+	}
+
+	param = 0U;
+	param |= 1U << MDIO_PARAM_INTERNAL_SEL;
+	param |= (busid & MDIO_PARAM_BUSID_MASK) << MDIO_PARAM_BUSID;
+	param |= (phyid & MDIO_PARAM_PHYID_MASK) << MDIO_PARAM_PHYID;
+	param |= (val & MDIO_PARAM_DATA_MASK) << MDIO_PARAM_DATA;
+
+	mmio_write_32(CMIC_MIIM_PARAM, param);
+
+	mmio_write_32(CMIC_MIIM_ADDRESS, reg);
+
+	mmio_write_32(CMIC_MIIM_CTRL, op);
+
+	ret = mdio_op_status(1U);
+	if (ret != 0) {
+		goto err;
+	}
+
+	if (op == MDIO_CTRL_READ_OP) {
+		ret = mmio_read_32(CMIC_MIIM_READ_DATA) & MDIO_READ_DATA_MASK;
+	}
+err:
+	return ret;
+}
+
+int mdio_write(uint16_t busid, uint16_t phyid, uint32_t reg, uint16_t val)
+{
+	int ret;
+
+	ret = mdio_op(busid, phyid, reg, val, MDIO_CTRL_WRITE_OP);
+	if (ret == -1) {
+		INFO("MDIO write fail\n");
+	}
+	return ret;
+}
+
+int mdio_read(uint16_t busid, uint16_t phyid, uint32_t reg)
+{
+	int ret;
+
+	ret = mdio_op(busid, phyid, reg, 0U, MDIO_CTRL_READ_OP);
+	if (ret == -1) {
+		INFO("MDIO read fail\n");
+	}
+	return ret;
+}