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/init.h> 25#include <linux/delay.h> 26#include <linux/netdevice.h> 27#include <linux/etherdevice.h> 28#include <linux/skbuff.h> 29#include <linux/spinlock.h> 30#include <linux/mii.h> 31#include <linux/ethtool.h> 32#include <linux/bitops.h> 33#include <linux/platform_device.h> 34#include <linux/of_platform.h> 35 36#include <asm/pgtable.h> 37#include <asm/irq.h> 38#include <asm/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 52static 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 75static 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 98static int fs_enet_fec_mii_reset(struct mii_bus *bus) 99{ 100 /* nothing here - for now */ 101 return 0; 102} 103 104static int __devinit fs_enet_mdio_probe(struct platform_device *ofdev, 105 const struct of_device_id *match) 106{ 107 struct resource res; 108 struct mii_bus *new_bus; 109 struct fec_info *fec; 110 int (*get_bus_freq)(struct device_node *) = match->data; 111 int ret = -ENOMEM, clock, speed; 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 new_bus->reset = &fs_enet_fec_mii_reset; 126 127 ret = of_address_to_resource(ofdev->dev.of_node, 0, &res); 128 if (ret) 129 goto out_res; 130 131 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start); 132 133 fec->fecp = ioremap(res.start, res.end - res.start + 1); 134 if (!fec->fecp) 135 goto out_fec; 136 137 if (get_bus_freq) { 138 clock = get_bus_freq(ofdev->dev.of_node); 139 if (!clock) { 140 /* Use maximum divider if clock is unknown */ 141 dev_warn(&ofdev->dev, "could not determine IPS clock\n"); 142 clock = 0x3F * 5000000; 143 } 144 } else 145 clock = ppc_proc_freq; 146 147 /* 148 * Scale for a MII clock <= 2.5 MHz 149 * Note that only 6 bits (25:30) are available for MII speed. 150 */ 151 speed = (clock + 4999999) / 5000000; 152 if (speed > 0x3F) { 153 speed = 0x3F; 154 dev_err(&ofdev->dev, 155 "MII clock (%d Hz) exceeds max (2.5 MHz)\n", 156 clock / speed); 157 } 158 159 fec->mii_speed = speed << 1; 160 161 setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE); 162 setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | 163 FEC_ECNTRL_ETHER_EN); 164 out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII); 165 clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed); 166 167 new_bus->phy_mask = ~0; 168 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); 169 if (!new_bus->irq) 170 goto out_unmap_regs; 171 172 new_bus->parent = &ofdev->dev; 173 dev_set_drvdata(&ofdev->dev, new_bus); 174 175 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node); 176 if (ret) 177 goto out_free_irqs; 178 179 return 0; 180 181out_free_irqs: 182 dev_set_drvdata(&ofdev->dev, NULL); 183 kfree(new_bus->irq); 184out_unmap_regs: 185 iounmap(fec->fecp); 186out_res: 187out_fec: 188 kfree(fec); 189out_mii: 190 mdiobus_free(new_bus); 191out: 192 return ret; 193} 194 195static int fs_enet_mdio_remove(struct platform_device *ofdev) 196{ 197 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev); 198 struct fec_info *fec = bus->priv; 199 200 mdiobus_unregister(bus); 201 dev_set_drvdata(&ofdev->dev, NULL); 202 kfree(bus->irq); 203 iounmap(fec->fecp); 204 kfree(fec); 205 mdiobus_free(bus); 206 207 return 0; 208} 209 210static struct of_device_id fs_enet_mdio_fec_match[] = { 211 { 212 .compatible = "fsl,pq1-fec-mdio", 213 }, 214#if defined(CONFIG_PPC_MPC512x) 215 { 216 .compatible = "fsl,mpc5121-fec-mdio", 217 .data = mpc5xxx_get_bus_frequency, 218 }, 219#endif 220 {}, 221}; 222MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match); 223 224static struct of_platform_driver fs_enet_fec_mdio_driver = { 225 .driver = { 226 .name = "fsl-fec-mdio", 227 .owner = THIS_MODULE, 228 .of_match_table = fs_enet_mdio_fec_match, 229 }, 230 .probe = fs_enet_mdio_probe, 231 .remove = fs_enet_mdio_remove, 232}; 233 234static int fs_enet_mdio_fec_init(void) 235{ 236 return of_register_platform_driver(&fs_enet_fec_mdio_driver); 237} 238 239static void fs_enet_mdio_fec_exit(void) 240{ 241 of_unregister_platform_driver(&fs_enet_fec_mdio_driver); 242} 243 244module_init(fs_enet_mdio_fec_init); 245module_exit(fs_enet_mdio_fec_exit); 246