diff options
Diffstat (limited to 'drivers/net/phy')
| -rw-r--r-- | drivers/net/phy/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/net/phy/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/phy/mdio-xgene.c | 477 | ||||
| -rw-r--r-- | drivers/net/phy/mdio-xgene.h | 143 |
4 files changed, 627 insertions, 0 deletions
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 1d7b208..47a6434 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -301,6 +301,12 @@ config MDIO_HISI_FEMAC This module provides a driver for the MDIO busses found in the Hisilicon SoC that have an Fast Ethernet MAC. +config MDIO_XGENE + tristate "APM X-Gene SoC MDIO bus controller" + help + This module provides a driver for the MDIO busses found in the + APM X-Gene SoC's. + endif # PHYLIB config MICREL_KS8995MA diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index 19e38a9..534dfa7 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -48,3 +48,4 @@ obj-$(CONFIG_MICROCHIP_PHY) += microchip.o obj-$(CONFIG_MDIO_BCM_IPROC) += mdio-bcm-iproc.o obj-$(CONFIG_INTEL_XWAY_PHY) += intel-xway.o obj-$(CONFIG_MDIO_HISI_FEMAC) += mdio-hisi-femac.o +obj-$(CONFIG_MDIO_XGENE) += mdio-xgene.o diff --git a/drivers/net/phy/mdio-xgene.c b/drivers/net/phy/mdio-xgene.c new file mode 100644 index 0000000..d94a978 --- /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"); diff --git a/drivers/net/phy/mdio-xgene.h b/drivers/net/phy/mdio-xgene.h new file mode 100644 index 0000000..354241b --- /dev/null +++ b/drivers/net/phy/mdio-xgene.h @@ -0,0 +1,143 @@ +/* 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/>. + */ + +#ifndef __MDIO_XGENE_H__ +#define __MDIO_XGENE_H__ + +#define BLOCK_XG_MDIO_CSR_OFFSET 0x5000 +#define BLOCK_DIAG_CSR_OFFSET 0xd000 +#define XGENET_CONFIG_REG_ADDR 0x20 + +#define MAC_ADDR_REG_OFFSET 0x00 +#define MAC_COMMAND_REG_OFFSET 0x04 +#define MAC_WRITE_REG_OFFSET 0x08 +#define MAC_READ_REG_OFFSET 0x0c +#define MAC_COMMAND_DONE_REG_OFFSET 0x10 + +#define CLKEN_OFFSET 0x08 +#define SRST_OFFSET 0x00 + +#define MENET_CFG_MEM_RAM_SHUTDOWN_ADDR 0x70 +#define MENET_BLOCK_MEM_RDY_ADDR 0x74 + +#define MAC_CONFIG_1_ADDR 0x00 +#define MII_MGMT_COMMAND_ADDR 0x24 +#define MII_MGMT_ADDRESS_ADDR 0x28 +#define MII_MGMT_CONTROL_ADDR 0x2c +#define MII_MGMT_STATUS_ADDR 0x30 +#define MII_MGMT_INDICATORS_ADDR 0x34 +#define SOFT_RESET BIT(31) + +#define MII_MGMT_CONFIG_ADDR 0x20 +#define MII_MGMT_COMMAND_ADDR 0x24 +#define MII_MGMT_ADDRESS_ADDR 0x28 +#define MII_MGMT_CONTROL_ADDR 0x2c +#define MII_MGMT_STATUS_ADDR 0x30 +#define MII_MGMT_INDICATORS_ADDR 0x34 + +#define MIIM_COMMAND_ADDR 0x20 +#define MIIM_FIELD_ADDR 0x24 +#define MIIM_CONFIGURATION_ADDR 0x28 +#define MIIM_LINKFAILVECTOR_ADDR 0x2c +#define MIIM_INDICATOR_ADDR 0x30 +#define MIIMRD_FIELD_ADDR 0x34 + +#define MDIO_CSR_OFFSET 0x5000 + +#define REG_ADDR_POS 0 +#define REG_ADDR_LEN 5 +#define PHY_ADDR_POS 8 +#define PHY_ADDR_LEN 5 + +#define HSTMIIMWRDAT_POS 0 +#define HSTMIIMWRDAT_LEN 16 +#define HSTPHYADX_POS 23 +#define HSTPHYADX_LEN 5 +#define HSTREGADX_POS 18 +#define HSTREGADX_LEN 5 +#define HSTLDCMD BIT(3) +#define HSTMIIMCMD_POS 0 +#define HSTMIIMCMD_LEN 3 + +#define BUSY_MASK BIT(0) +#define READ_CYCLE_MASK BIT(0) + +enum xgene_enet_cmd { + XGENE_ENET_WR_CMD = BIT(31), + XGENE_ENET_RD_CMD = BIT(30) +}; + +enum { + MIIM_CMD_IDLE, + MIIM_CMD_LEGACY_WRITE, + MIIM_CMD_LEGACY_READ, +}; + +enum xgene_mdio_id { + XGENE_MDIO_RGMII = 1, + XGENE_MDIO_XFI +}; + +struct xgene_mdio_pdata { + struct clk *clk; + struct device *dev; + void __iomem *mac_csr_addr; + void __iomem *diag_csr_addr; + void __iomem *mdio_csr_addr; + struct mii_bus *mdio_bus; + int mdio_id; +}; + +/* Set the specified value into a bit-field defined by its starting position + * and length within a single u64. + */ +static inline u64 xgene_enet_set_field_value(int pos, int len, u64 val) +{ + return (val & ((1ULL << len) - 1)) << pos; +} + +#define SET_VAL(field, val) \ + xgene_enet_set_field_value(field ## _POS, field ## _LEN, val) + +#define SET_BIT(field) \ + xgene_enet_set_field_value(field ## _POS, 1, 1) + +/* Get the value from a bit-field defined by its starting position + * and length within the specified u64. + */ +static inline u64 xgene_enet_get_field_value(int pos, int len, u64 src) +{ + return (src >> pos) & ((1ULL << len) - 1); +} + +#define GET_VAL(field, src) \ + xgene_enet_get_field_value(field ## _POS, field ## _LEN, src) + +#define GET_BIT(field, src) \ + xgene_enet_get_field_value(field ## _POS, 1, src) + +static const struct of_device_id xgene_mdio_of_match[]; +#ifdef CONFIG_ACPI +static const struct acpi_device_id xgene_mdio_acpi_match[]; +#endif +int xgene_mdio_rgmii_read(struct mii_bus *bus, int phy_id, int reg); +int xgene_mdio_rgmii_write(struct mii_bus *bus, int phy_id, int reg, u16 data); +struct phy_device *xgene_enet_phy_register(struct mii_bus *bus, int phy_addr); + +#endif /* __MDIO_XGENE_H__ */ |