1 // SPDX-License-Identifier: GPL-2.0+
4 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
8 #include <linux/delay.h>
11 #ifdef CONFIG_GDSYS_LEGACY_DRIVERS
12 #include <gdsys_fpga.h>
21 #ifndef CONFIG_GDSYS_LEGACY_DRIVERS
23 REG_MDIO_CONTROL = 0x0,
24 REG_MDIO_ADDR_DATA = 0x2,
25 REG_MDIO_RX_DATA = 0x4,
28 static inline u16 read_reg(struct udevice *fpga, uint base, uint addr)
33 regmap_init_mem(dev_ofnode(fpga), &map);
34 ptr = regmap_get_range(map, 0);
36 return in_le16((u16 *)(ptr + base + addr));
39 static inline void write_reg(struct udevice *fpga, uint base, uint addr,
45 regmap_init_mem(dev_ofnode(fpga), &map);
46 ptr = regmap_get_range(map, 0);
48 out_le16((u16 *)(ptr + base + addr), val);
52 static inline u16 read_control(struct ihs_mdio_info *info)
55 #ifdef CONFIG_GDSYS_LEGACY_DRIVERS
56 FPGA_GET_REG(info->fpga, mdio.control, &val);
58 val = read_reg(info->fpga, info->base, REG_MDIO_CONTROL);
63 static inline void write_control(struct ihs_mdio_info *info, u16 val)
65 #ifdef CONFIG_GDSYS_LEGACY_DRIVERS
66 FPGA_SET_REG(info->fpga, mdio.control, val);
68 write_reg(info->fpga, info->base, REG_MDIO_CONTROL, val);
72 static inline void write_addr_data(struct ihs_mdio_info *info, u16 val)
74 #ifdef CONFIG_GDSYS_LEGACY_DRIVERS
75 FPGA_SET_REG(info->fpga, mdio.address_data, val);
77 write_reg(info->fpga, info->base, REG_MDIO_ADDR_DATA, val);
81 static inline u16 read_rx_data(struct ihs_mdio_info *info)
84 #ifdef CONFIG_GDSYS_LEGACY_DRIVERS
85 FPGA_GET_REG(info->fpga, mdio.rx_data, &val);
87 val = read_reg(info->fpga, info->base, REG_MDIO_RX_DATA);
92 static int ihs_mdio_idle(struct mii_dev *bus)
94 struct ihs_mdio_info *info = bus->priv;
99 val = read_control(info);
103 } while (!(val & (1 << 12)));
108 static int ihs_mdio_reset(struct mii_dev *bus)
115 static int ihs_mdio_read(struct mii_dev *bus, int addr, int dev_addr,
118 struct ihs_mdio_info *info = bus->priv;
124 ((addr & 0x1f) << 5) | (regnum & 0x1f) | (2 << 10));
126 /* wait for rx data available */
129 val = read_rx_data(info);
134 static int ihs_mdio_write(struct mii_dev *bus, int addr, int dev_addr,
135 int regnum, u16 value)
137 struct ihs_mdio_info *info = bus->priv;
141 write_addr_data(info, value);
142 write_control(info, ((addr & 0x1f) << 5) | (regnum & 0x1f) | (1 << 10));
147 int ihs_mdio_init(struct ihs_mdio_info *info)
149 struct mii_dev *bus = mdio_alloc();
152 printf("Failed to allocate FSL MDIO bus\n");
156 bus->read = ihs_mdio_read;
157 bus->write = ihs_mdio_write;
158 bus->reset = ihs_mdio_reset;
159 strcpy(bus->name, info->name);
163 return mdio_register(bus);