1 /* 2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx. 3 * 4 * Copyright (c) 2003 Intracom S.A. 5 * by Pantelis Antoniou <panto@intracom.gr> 6 * 7 * 2005 (c) MontaVista Software, Inc. 8 * Vitaly Bordug <vbordug@ru.mvista.com> 9 * 10 * This file is licensed under the terms of the GNU General Public License 11 * version 2. This program is licensed "as is" without any warranty of any 12 * kind, whether express or implied. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/ioport.h> 17 #include <linux/slab.h> 18 #include <linux/interrupt.h> 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/mii.h> 22 #include <linux/platform_device.h> 23 #include <linux/mdio-bitbang.h> 24 #include <linux/of_address.h> 25 #include <linux/of_mdio.h> 26 #include <linux/of_platform.h> 27 28 #include "fs_enet.h" 29 30 struct bb_info { 31 struct mdiobb_ctrl ctrl; 32 __be32 __iomem *dir; 33 __be32 __iomem *dat; 34 u32 mdio_msk; 35 u32 mdc_msk; 36 }; 37 38 /* FIXME: If any other users of GPIO crop up, then these will have to 39 * have some sort of global synchronization to avoid races with other 40 * pins on the same port. The ideal solution would probably be to 41 * bind the ports to a GPIO driver, and have this be a client of it. 42 */ 43 static inline void bb_set(u32 __iomem *p, u32 m) 44 { 45 out_be32(p, in_be32(p) | m); 46 } 47 48 static inline void bb_clr(u32 __iomem *p, u32 m) 49 { 50 out_be32(p, in_be32(p) & ~m); 51 } 52 53 static inline int bb_read(u32 __iomem *p, u32 m) 54 { 55 return (in_be32(p) & m) != 0; 56 } 57 58 static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir) 59 { 60 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); 61 62 if (dir) 63 bb_set(bitbang->dir, bitbang->mdio_msk); 64 else 65 bb_clr(bitbang->dir, bitbang->mdio_msk); 66 67 /* Read back to flush the write. */ 68 in_be32(bitbang->dir); 69 } 70 71 static inline int mdio_read(struct mdiobb_ctrl *ctrl) 72 { 73 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); 74 return bb_read(bitbang->dat, bitbang->mdio_msk); 75 } 76 77 static inline void mdio(struct mdiobb_ctrl *ctrl, int what) 78 { 79 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); 80 81 if (what) 82 bb_set(bitbang->dat, bitbang->mdio_msk); 83 else 84 bb_clr(bitbang->dat, bitbang->mdio_msk); 85 86 /* Read back to flush the write. */ 87 in_be32(bitbang->dat); 88 } 89 90 static inline void mdc(struct mdiobb_ctrl *ctrl, int what) 91 { 92 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); 93 94 if (what) 95 bb_set(bitbang->dat, bitbang->mdc_msk); 96 else 97 bb_clr(bitbang->dat, bitbang->mdc_msk); 98 99 /* Read back to flush the write. */ 100 in_be32(bitbang->dat); 101 } 102 103 static const struct mdiobb_ops bb_ops = { 104 .owner = THIS_MODULE, 105 .set_mdc = mdc, 106 .set_mdio_dir = mdio_dir, 107 .set_mdio_data = mdio, 108 .get_mdio_data = mdio_read, 109 }; 110 111 static int fs_mii_bitbang_init(struct mii_bus *bus, struct device_node *np) 112 { 113 struct resource res; 114 const u32 *data; 115 int mdio_pin, mdc_pin, len; 116 struct bb_info *bitbang = bus->priv; 117 118 int ret = of_address_to_resource(np, 0, &res); 119 if (ret) 120 return ret; 121 122 if (resource_size(&res) <= 13) 123 return -ENODEV; 124 125 /* This should really encode the pin number as well, but all 126 * we get is an int, and the odds of multiple bitbang mdio buses 127 * is low enough that it's not worth going too crazy. 128 */ 129 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); 130 131 data = of_get_property(np, "fsl,mdio-pin", &len); 132 if (!data || len != 4) 133 return -ENODEV; 134 mdio_pin = *data; 135 136 data = of_get_property(np, "fsl,mdc-pin", &len); 137 if (!data || len != 4) 138 return -ENODEV; 139 mdc_pin = *data; 140 141 bitbang->dir = ioremap(res.start, resource_size(&res)); 142 if (!bitbang->dir) 143 return -ENOMEM; 144 145 bitbang->dat = bitbang->dir + 4; 146 bitbang->mdio_msk = 1 << (31 - mdio_pin); 147 bitbang->mdc_msk = 1 << (31 - mdc_pin); 148 149 return 0; 150 } 151 152 static int fs_enet_mdio_probe(struct platform_device *ofdev) 153 { 154 struct mii_bus *new_bus; 155 struct bb_info *bitbang; 156 int ret = -ENOMEM; 157 158 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL); 159 if (!bitbang) 160 goto out; 161 162 bitbang->ctrl.ops = &bb_ops; 163 164 new_bus = alloc_mdio_bitbang(&bitbang->ctrl); 165 if (!new_bus) 166 goto out_free_priv; 167 168 new_bus->name = "CPM2 Bitbanged MII", 169 170 ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node); 171 if (ret) 172 goto out_free_bus; 173 174 new_bus->phy_mask = ~0; 175 176 new_bus->parent = &ofdev->dev; 177 platform_set_drvdata(ofdev, new_bus); 178 179 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node); 180 if (ret) 181 goto out_unmap_regs; 182 183 return 0; 184 185 out_unmap_regs: 186 iounmap(bitbang->dir); 187 out_free_bus: 188 free_mdio_bitbang(new_bus); 189 out_free_priv: 190 kfree(bitbang); 191 out: 192 return ret; 193 } 194 195 static int fs_enet_mdio_remove(struct platform_device *ofdev) 196 { 197 struct mii_bus *bus = platform_get_drvdata(ofdev); 198 struct bb_info *bitbang = bus->priv; 199 200 mdiobus_unregister(bus); 201 free_mdio_bitbang(bus); 202 iounmap(bitbang->dir); 203 kfree(bitbang); 204 205 return 0; 206 } 207 208 static const struct of_device_id fs_enet_mdio_bb_match[] = { 209 { 210 .compatible = "fsl,cpm2-mdio-bitbang", 211 }, 212 {}, 213 }; 214 MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match); 215 216 static struct platform_driver fs_enet_bb_mdio_driver = { 217 .driver = { 218 .name = "fsl-bb-mdio", 219 .of_match_table = fs_enet_mdio_bb_match, 220 }, 221 .probe = fs_enet_mdio_probe, 222 .remove = fs_enet_mdio_remove, 223 }; 224 225 module_platform_driver(fs_enet_bb_mdio_driver); 226 MODULE_LICENSE("GPL"); 227