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/types.h> 17 #include <linux/kernel.h> 18 #include <linux/string.h> 19 #include <linux/ptrace.h> 20 #include <linux/errno.h> 21 #include <linux/ioport.h> 22 #include <linux/slab.h> 23 #include <linux/interrupt.h> 24 #include <linux/delay.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/skbuff.h> 28 #include <linux/spinlock.h> 29 #include <linux/mii.h> 30 #include <linux/ethtool.h> 31 #include <linux/bitops.h> 32 #include <linux/platform_device.h> 33 #include <linux/of_address.h> 34 #include <linux/of_platform.h> 35 #include <linux/pgtable.h> 36 37 #include <asm/irq.h> 38 #include <linux/uaccess.h> 39 #include <asm/mpc5xxx.h> 40 41 #include "fs_enet.h" 42 #include "fec.h" 43 44 /* Make MII read/write commands for the FEC. 45 */ 46 #define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18)) 47 #define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff)) 48 #define mk_mii_end 0 49 50 #define FEC_MII_LOOPS 10000 51 52 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location) 53 { 54 struct fec_info* fec = bus->priv; 55 struct fec __iomem *fecp = fec->fecp; 56 int i, ret = -1; 57 58 BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0); 59 60 /* Add PHY address to register command. */ 61 out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location)); 62 63 for (i = 0; i < FEC_MII_LOOPS; i++) 64 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0) 65 break; 66 67 if (i < FEC_MII_LOOPS) { 68 out_be32(&fecp->fec_ievent, FEC_ENET_MII); 69 ret = in_be32(&fecp->fec_mii_data) & 0xffff; 70 } 71 72 return ret; 73 } 74 75 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val) 76 { 77 struct fec_info* fec = bus->priv; 78 struct fec __iomem *fecp = fec->fecp; 79 int i; 80 81 /* this must never happen */ 82 BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0); 83 84 /* Add PHY address to register command. */ 85 out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val)); 86 87 for (i = 0; i < FEC_MII_LOOPS; i++) 88 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0) 89 break; 90 91 if (i < FEC_MII_LOOPS) 92 out_be32(&fecp->fec_ievent, FEC_ENET_MII); 93 94 return 0; 95 96 } 97 98 static const struct of_device_id fs_enet_mdio_fec_match[]; 99 static int fs_enet_mdio_probe(struct platform_device *ofdev) 100 { 101 const struct of_device_id *match; 102 struct resource res; 103 struct mii_bus *new_bus; 104 struct fec_info *fec; 105 int (*get_bus_freq)(struct device_node *); 106 int ret = -ENOMEM, clock, speed; 107 108 match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev); 109 if (!match) 110 return -EINVAL; 111 get_bus_freq = match->data; 112 113 new_bus = mdiobus_alloc(); 114 if (!new_bus) 115 goto out; 116 117 fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL); 118 if (!fec) 119 goto out_mii; 120 121 new_bus->priv = fec; 122 new_bus->name = "FEC MII Bus"; 123 new_bus->read = &fs_enet_fec_mii_read; 124 new_bus->write = &fs_enet_fec_mii_write; 125 126 ret = of_address_to_resource(ofdev->dev.of_node, 0, &res); 127 if (ret) 128 goto out_res; 129 130 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start); 131 132 fec->fecp = ioremap(res.start, resource_size(&res)); 133 if (!fec->fecp) { 134 ret = -ENOMEM; 135 goto out_fec; 136 } 137 138 if (get_bus_freq) { 139 clock = get_bus_freq(ofdev->dev.of_node); 140 if (!clock) { 141 /* Use maximum divider if clock is unknown */ 142 dev_warn(&ofdev->dev, "could not determine IPS clock\n"); 143 clock = 0x3F * 5000000; 144 } 145 } else 146 clock = ppc_proc_freq; 147 148 /* 149 * Scale for a MII clock <= 2.5 MHz 150 * Note that only 6 bits (25:30) are available for MII speed. 151 */ 152 speed = (clock + 4999999) / 5000000; 153 if (speed > 0x3F) { 154 speed = 0x3F; 155 dev_err(&ofdev->dev, 156 "MII clock (%d Hz) exceeds max (2.5 MHz)\n", 157 clock / speed); 158 } 159 160 fec->mii_speed = speed << 1; 161 162 setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE); 163 setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | 164 FEC_ECNTRL_ETHER_EN); 165 out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII); 166 clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed); 167 168 new_bus->phy_mask = ~0; 169 170 new_bus->parent = &ofdev->dev; 171 platform_set_drvdata(ofdev, new_bus); 172 173 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node); 174 if (ret) 175 goto out_unmap_regs; 176 177 return 0; 178 179 out_unmap_regs: 180 iounmap(fec->fecp); 181 out_res: 182 out_fec: 183 kfree(fec); 184 out_mii: 185 mdiobus_free(new_bus); 186 out: 187 return ret; 188 } 189 190 static int fs_enet_mdio_remove(struct platform_device *ofdev) 191 { 192 struct mii_bus *bus = platform_get_drvdata(ofdev); 193 struct fec_info *fec = bus->priv; 194 195 mdiobus_unregister(bus); 196 iounmap(fec->fecp); 197 kfree(fec); 198 mdiobus_free(bus); 199 200 return 0; 201 } 202 203 static const struct of_device_id fs_enet_mdio_fec_match[] = { 204 { 205 .compatible = "fsl,pq1-fec-mdio", 206 }, 207 #if defined(CONFIG_PPC_MPC512x) 208 { 209 .compatible = "fsl,mpc5121-fec-mdio", 210 .data = mpc5xxx_get_bus_frequency, 211 }, 212 #endif 213 {}, 214 }; 215 MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match); 216 217 static struct platform_driver fs_enet_fec_mdio_driver = { 218 .driver = { 219 .name = "fsl-fec-mdio", 220 .of_match_table = fs_enet_mdio_fec_match, 221 }, 222 .probe = fs_enet_mdio_probe, 223 .remove = fs_enet_mdio_remove, 224 }; 225 226 module_platform_driver(fs_enet_fec_mdio_driver); 227