1 files changed, 477 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio-xgene.c b/drivers/net/phy/mdio-xgene.c
new file mode 100644
index 000000000000..d94a978024d9
--- /dev/null
+++ b/drivers/net/phy/mdio-xgene.c
@@ -0,0 +1,477 @@
+/* Applied Micro X-Gene SoC MDIO Driver
+ *
+ * Copyright (c) 2016, Applied Micro Circuits Corporation
+ * Author: Iyappan Subramanian <isubramanian@apm.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/efi.h>
+#include <linux/if_vlan.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_net.h>
+#include <linux/of_mdio.h>
+#include <linux/prefetch.h>
+#include <linux/phy.h>
+#include <net/ip.h>
+#include "mdio-xgene.h"
+
+static bool xgene_mdio_status;
+
+static u32 xgene_enet_rd_mac(void __iomem *base_addr, u32 rd_addr)
+{
+	void __iomem *addr, *rd, *cmd, *cmd_done;
+	u32 done, rd_data = BUSY_MASK;
+	u8 wait = 10;
+
+	addr = base_addr + MAC_ADDR_REG_OFFSET;
+	rd = base_addr + MAC_READ_REG_OFFSET;
+	cmd = base_addr + MAC_COMMAND_REG_OFFSET;
+	cmd_done = base_addr + MAC_COMMAND_DONE_REG_OFFSET;
+
+	iowrite32(rd_addr, addr);
+	iowrite32(XGENE_ENET_RD_CMD, cmd);
+
+	while (wait--) {
+		done = ioread32(cmd_done);
+		if (done)
+			break;
+		udelay(1);
+	}
+
+	if (!done)
+		return rd_data;
+
+	rd_data = ioread32(rd);
+	iowrite32(0, cmd);
+
+	return rd_data;
+}
+
+static void xgene_enet_wr_mac(void __iomem *base_addr, u32 wr_addr, u32 wr_data)
+{
+	void __iomem *addr, *wr, *cmd, *cmd_done;
+	u8 wait = 10;
+	u32 done;
+
+	addr = base_addr + MAC_ADDR_REG_OFFSET;
+	wr = base_addr + MAC_WRITE_REG_OFFSET;
+	cmd = base_addr + MAC_COMMAND_REG_OFFSET;
+	cmd_done = base_addr + MAC_COMMAND_DONE_REG_OFFSET;
+
+	iowrite32(wr_addr, addr);
+	iowrite32(wr_data, wr);
+	iowrite32(XGENE_ENET_WR_CMD, cmd);
+
+	while (wait--) {
+		done = ioread32(cmd_done);
+		if (done)
+			break;
+		udelay(1);
+	}
+
+	if (!done)
+		pr_err("MCX mac write failed, addr: 0x%04x\n", wr_addr);
+
+	iowrite32(0, cmd);
+}
+
+int xgene_mdio_rgmii_read(struct mii_bus *bus, int phy_id, int reg)
+{
+	void __iomem *addr = (void __iomem *)bus->priv;
+	u32 data, done;
+	u8 wait = 10;
+
+	data = SET_VAL(PHY_ADDR, phy_id) | SET_VAL(REG_ADDR, reg);
+	xgene_enet_wr_mac(addr, MII_MGMT_ADDRESS_ADDR, data);
+	xgene_enet_wr_mac(addr, MII_MGMT_COMMAND_ADDR, READ_CYCLE_MASK);
+	do {
+		usleep_range(5, 10);
+		done = xgene_enet_rd_mac(addr, MII_MGMT_INDICATORS_ADDR);
+	} while ((done & BUSY_MASK) && wait--);
+
+	if (done & BUSY_MASK) {
+		dev_err(&bus->dev, "MII_MGMT read failed\n");
+		return -EBUSY;
+	}
+
+	data = xgene_enet_rd_mac(addr, MII_MGMT_STATUS_ADDR);
+	xgene_enet_wr_mac(addr, MII_MGMT_COMMAND_ADDR, 0);
+
+	return data;
+}
+EXPORT_SYMBOL(xgene_mdio_rgmii_read);
+
+int xgene_mdio_rgmii_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
+{
+	void __iomem *addr = (void __iomem *)bus->priv;
+	u32 val, done;
+	u8 wait = 10;
+
+	val = SET_VAL(PHY_ADDR, phy_id) | SET_VAL(REG_ADDR, reg);
+	xgene_enet_wr_mac(addr, MII_MGMT_ADDRESS_ADDR, val);
+
+	xgene_enet_wr_mac(addr, MII_MGMT_CONTROL_ADDR, data);
+	do {
+		usleep_range(5, 10);
+		done = xgene_enet_rd_mac(addr, MII_MGMT_INDICATORS_ADDR);
+	} while ((done & BUSY_MASK) && wait--);
+
+	if (done & BUSY_MASK) {
+		dev_err(&bus->dev, "MII_MGMT write failed\n");
+		return -EBUSY;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(xgene_mdio_rgmii_write);
+
+static u32 xgene_menet_rd_diag_csr(struct xgene_mdio_pdata *pdata, u32 offset)
+{
+	return ioread32(pdata->diag_csr_addr + offset);
+}
+
+static void xgene_menet_wr_diag_csr(struct xgene_mdio_pdata *pdata,
+				    u32 offset, u32 val)
+{
+	iowrite32(val, pdata->diag_csr_addr + offset);
+}
+
+static int xgene_enet_ecc_init(struct xgene_mdio_pdata *pdata)
+{
+	u32 data;
+	u8 wait = 10;
+
+	xgene_menet_wr_diag_csr(pdata, MENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0x0);
+	do {
+		usleep_range(100, 110);
+		data = xgene_menet_rd_diag_csr(pdata, MENET_BLOCK_MEM_RDY_ADDR);
+	} while ((data != 0xffffffff) && wait--);
+
+	if (data != 0xffffffff) {
+		dev_err(pdata->dev, "Failed to release memory from shutdown\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void xgene_gmac_reset(struct xgene_mdio_pdata *pdata)
+{
+	xgene_enet_wr_mac(pdata->mac_csr_addr, MAC_CONFIG_1_ADDR, SOFT_RESET);
+	xgene_enet_wr_mac(pdata->mac_csr_addr, MAC_CONFIG_1_ADDR, 0);
+}
+
+static int xgene_mdio_reset(struct xgene_mdio_pdata *pdata)
+{
+	int ret;
+
+	if (pdata->dev->of_node) {
+		clk_prepare_enable(pdata->clk);
+		udelay(5);
+		clk_disable_unprepare(pdata->clk);
+		udelay(5);
+		clk_prepare_enable(pdata->clk);
+		udelay(5);
+	} else {
+#ifdef CONFIG_ACPI
+		acpi_evaluate_object(ACPI_HANDLE(pdata->dev),
+				     "_RST", NULL, NULL);
+#endif
+	}
+
+	ret = xgene_enet_ecc_init(pdata);
+	if (ret)
+		return ret;
+	xgene_gmac_reset(pdata);
+
+	return 0;
+}
+
+static void xgene_enet_rd_mdio_csr(void __iomem *base_addr,
+				   u32 offset, u32 *val)
+{
+	void __iomem *addr = base_addr  + offset;
+
+	*val = ioread32(addr);
+}
+
+static void xgene_enet_wr_mdio_csr(void __iomem *base_addr,
+				   u32 offset, u32 val)
+{
+	void __iomem *addr = base_addr  + offset;
+
+	iowrite32(val, addr);
+}
+
+static int xgene_xfi_mdio_write(struct mii_bus *bus, int phy_id,
+				int reg, u16 data)
+{
+	void __iomem *addr = (void __iomem *)bus->priv;
+	int timeout = 100;
+	u32 status, val;
+
+	val = SET_VAL(HSTPHYADX, phy_id) | SET_VAL(HSTREGADX, reg) |
+	      SET_VAL(HSTMIIMWRDAT, data);
+	xgene_enet_wr_mdio_csr(addr, MIIM_FIELD_ADDR, data);
+
+	val = HSTLDCMD | SET_VAL(HSTMIIMCMD, MIIM_CMD_LEGACY_WRITE);
+	xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, val);
+
+	do {
+		usleep_range(5, 10);
+		xgene_enet_rd_mdio_csr(addr, MIIM_INDICATOR_ADDR, &status);
+	} while ((status & BUSY_MASK) && timeout--);
+
+	xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, 0);
+
+	return 0;
+}
+
+static int xgene_xfi_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+	void __iomem *addr = (void __iomem *)bus->priv;
+	u32 data, status, val;
+	int timeout = 100;
+
+	val = SET_VAL(HSTPHYADX, phy_id) | SET_VAL(HSTREGADX, reg);
+	xgene_enet_wr_mdio_csr(addr, MIIM_FIELD_ADDR, val);
+
+	val = HSTLDCMD | SET_VAL(HSTMIIMCMD, MIIM_CMD_LEGACY_READ);
+	xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, val);
+
+	do {
+		usleep_range(5, 10);
+		xgene_enet_rd_mdio_csr(addr, MIIM_INDICATOR_ADDR, &status);
+	} while ((status & BUSY_MASK) && timeout--);
+
+	if (status & BUSY_MASK) {
+		pr_err("XGENET_MII_MGMT write failed\n");
+		return -EBUSY;
+	}
+
+	xgene_enet_rd_mdio_csr(addr, MIIMRD_FIELD_ADDR, &data);
+	xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, 0);
+
+	return data;
+}
+
+struct phy_device *xgene_enet_phy_register(struct mii_bus *bus, int phy_addr)
+{
+	struct phy_device *phy_dev;
+
+	phy_dev = get_phy_device(bus, phy_addr, false);
+	if (!phy_dev || IS_ERR(phy_dev))
+		return NULL;
+
+	if (phy_device_register(phy_dev))
+		phy_device_free(phy_dev);
+
+	return phy_dev;
+}
+EXPORT_SYMBOL(xgene_enet_phy_register);
+
+#ifdef CONFIG_ACPI
+static acpi_status acpi_register_phy(acpi_handle handle, u32 lvl,
+				     void *context, void **ret)
+{
+	struct mii_bus *mdio = context;
+	struct acpi_device *adev;
+	struct phy_device *phy_dev;
+	const union acpi_object *obj;
+	u32 phy_addr;
+
+	if (acpi_bus_get_device(handle, &adev))
+		return AE_OK;
+
+	if (acpi_dev_get_property(adev, "phy-channel", ACPI_TYPE_INTEGER, &obj))
+		return AE_OK;
+	phy_addr = obj->integer.value;
+
+	phy_dev = xgene_enet_phy_register(mdio, phy_addr);
+	adev->driver_data = phy_dev;
+
+	return AE_OK;
+}
+#endif
+
+static int xgene_mdio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mii_bus *mdio_bus;
+	const struct of_device_id *of_id;
+	struct resource *res;
+	struct xgene_mdio_pdata *pdata;
+	void __iomem *csr_base;
+	int mdio_id = 0, ret = 0;
+
+	of_id = of_match_device(xgene_mdio_of_match, &pdev->dev);
+	if (of_id) {
+		mdio_id = (enum xgene_mdio_id)of_id->data;
+	} else {
+#ifdef CONFIG_ACPI
+		const struct acpi_device_id *acpi_id;
+
+		acpi_id = acpi_match_device(xgene_mdio_acpi_match, &pdev->dev);
+		if (acpi_id)
+			mdio_id = (enum xgene_mdio_id)acpi_id->driver_data;
+#endif
+	}
+
+	if (!mdio_id)
+		return -ENODEV;
+
+	pdata = devm_kzalloc(dev, sizeof(struct xgene_mdio_pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+	pdata->mdio_id = mdio_id;
+	pdata->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	csr_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(csr_base)) {
+		dev_err(dev, "Unable to retrieve mac CSR region\n");
+		return PTR_ERR(csr_base);
+	}
+	pdata->mac_csr_addr = csr_base;
+	pdata->mdio_csr_addr = csr_base + BLOCK_XG_MDIO_CSR_OFFSET;
+	pdata->diag_csr_addr = csr_base + BLOCK_DIAG_CSR_OFFSET;
+
+	if (dev->of_node) {
+		pdata->clk = devm_clk_get(dev, NULL);
+		if (IS_ERR(pdata->clk)) {
+			dev_err(dev, "Unable to retrieve clk\n");
+			return PTR_ERR(pdata->clk);
+		}
+	}
+
+	ret = xgene_mdio_reset(pdata);
+	if (ret)
+		return ret;
+
+	mdio_bus = mdiobus_alloc();
+	if (!mdio_bus)
+		return -ENOMEM;
+
+	mdio_bus->name = "APM X-Gene MDIO bus";
+
+	if (mdio_id == XGENE_MDIO_RGMII) {
+		mdio_bus->read = xgene_mdio_rgmii_read;
+		mdio_bus->write = xgene_mdio_rgmii_write;
+		mdio_bus->priv = (void __force *)pdata->mac_csr_addr;
+		snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s",
+			 "xgene-mii-rgmii");
+	} else {
+		mdio_bus->read = xgene_xfi_mdio_read;
+		mdio_bus->write = xgene_xfi_mdio_write;
+		mdio_bus->priv = (void __force *)pdata->mdio_csr_addr;
+		snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s",
+			 "xgene-mii-xfi");
+	}
+
+	mdio_bus->parent = dev;
+	platform_set_drvdata(pdev, pdata);
+
+	if (dev->of_node) {
+		ret = of_mdiobus_register(mdio_bus, dev->of_node);
+	} else {
+#ifdef CONFIG_ACPI
+		/* Mask out all PHYs from auto probing. */
+		mdio_bus->phy_mask = ~0;
+		ret = mdiobus_register(mdio_bus);
+		if (ret)
+			goto out;
+
+		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_HANDLE(dev), 1,
+				    acpi_register_phy, NULL, mdio_bus, NULL);
+#endif
+	}
+
+	if (ret)
+		goto out;
+
+	pdata->mdio_bus = mdio_bus;
+	xgene_mdio_status = true;
+
+	return 0;
+
+out:
+	mdiobus_free(mdio_bus);
+
+	return ret;
+}
+
+static int xgene_mdio_remove(struct platform_device *pdev)
+{
+	struct xgene_mdio_pdata *pdata = platform_get_drvdata(pdev);
+	struct mii_bus *mdio_bus = pdata->mdio_bus;
+	struct device *dev = &pdev->dev;
+
+	mdiobus_unregister(mdio_bus);
+	mdiobus_free(mdio_bus);
+
+	if (dev->of_node) {
+		if (IS_ERR(pdata->clk))
+			clk_disable_unprepare(pdata->clk);
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id xgene_mdio_of_match[] = {
+	{
+		.compatible = "apm,xgene-mdio-rgmii",
+		.data = (void *)XGENE_MDIO_RGMII
+	},
+	{
+		.compatible = "apm,xgene-mdio-xfi",
+		.data = (void *)XGENE_MDIO_XFI
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, xgene_mdio_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_mdio_acpi_match[] = {
+	{ "APMC0D65", XGENE_MDIO_RGMII },
+	{ "APMC0D66", XGENE_MDIO_XFI },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(acpi, xgene_mdio_acpi_match);
+#endif
+
+static struct platform_driver xgene_mdio_driver = {
+	.driver = {
+		.name = "xgene-mdio",
+		.of_match_table = of_match_ptr(xgene_mdio_of_match),
+		.acpi_match_table = ACPI_PTR(xgene_mdio_acpi_match),
+	},
+	.probe = xgene_mdio_probe,
+	.remove = xgene_mdio_remove,
+};
+
+module_platform_driver(xgene_mdio_driver);
+
+MODULE_DESCRIPTION("APM X-Gene SoC MDIO driver");
+MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
+MODULE_LICENSE("GPL");