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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Freescale Ethernet controllers4 *5 * Copyright (c) 2005 Intracom S.A.6 * by Pantelis Antoniou <panto@intracom.gr>7 *8 * 2005 (c) MontaVista Software, Inc.9 * Vitaly Bordug <vbordug@ru.mvista.com>10 */11 12#include <linux/module.h>13#include <linux/kernel.h>14#include <linux/types.h>15#include <linux/string.h>16#include <linux/ptrace.h>17#include <linux/errno.h>18#include <linux/crc32.h>19#include <linux/ioport.h>20#include <linux/interrupt.h>21#include <linux/delay.h>22#include <linux/netdevice.h>23#include <linux/etherdevice.h>24#include <linux/skbuff.h>25#include <linux/spinlock.h>26#include <linux/ethtool.h>27#include <linux/bitops.h>28#include <linux/fs.h>29#include <linux/platform_device.h>30#include <linux/of_address.h>31#include <linux/of_irq.h>32#include <linux/gfp.h>33 34#include <asm/irq.h>35#include <linux/uaccess.h>36 37#include "fs_enet.h"38#include "fec.h"39 40/*************************************************/41 42#if defined(CONFIG_CPM1)43/* for a CPM1 __raw_xxx's are sufficient */44#define __fs_out32(addr, x) __raw_writel(x, addr)45#define __fs_out16(addr, x) __raw_writew(x, addr)46#define __fs_in32(addr) __raw_readl(addr)47#define __fs_in16(addr) __raw_readw(addr)48#else49/* for others play it safe */50#define __fs_out32(addr, x) out_be32(addr, x)51#define __fs_out16(addr, x) out_be16(addr, x)52#define __fs_in32(addr) in_be32(addr)53#define __fs_in16(addr) in_be16(addr)54#endif55 56/* write */57#define FW(_fecp, _reg, _v) __fs_out32(&(_fecp)->fec_ ## _reg, (_v))58 59/* read */60#define FR(_fecp, _reg) __fs_in32(&(_fecp)->fec_ ## _reg)61 62/* set bits */63#define FS(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) | (_v))64 65/* clear bits */66#define FC(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) & ~(_v))67 68/*69 * Delay to wait for FEC reset command to complete (in us)70 */71#define FEC_RESET_DELAY 5072 73static int whack_reset(struct fec __iomem *fecp)74{75 int i;76 77 FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);78 for (i = 0; i < FEC_RESET_DELAY; i++) {79 if ((FR(fecp, ecntrl) & FEC_ECNTRL_RESET) == 0)80 return 0; /* OK */81 udelay(1);82 }83 84 return -1;85}86 87static int do_pd_setup(struct fs_enet_private *fep)88{89 struct platform_device *ofdev = to_platform_device(fep->dev);90 91 fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0);92 if (!fep->interrupt)93 return -EINVAL;94 95 fep->fec.fecp = of_iomap(ofdev->dev.of_node, 0);96 if (!fep->fec.fecp)97 return -EINVAL;98 99 return 0;100}101 102#define FEC_NAPI_EVENT_MSK (FEC_ENET_RXF | FEC_ENET_RXB | FEC_ENET_TXF)103#define FEC_EVENT (FEC_ENET_RXF | FEC_ENET_TXF)104#define FEC_ERR_EVENT_MSK (FEC_ENET_HBERR | FEC_ENET_BABR | \105 FEC_ENET_BABT | FEC_ENET_EBERR)106 107static int setup_data(struct net_device *dev)108{109 struct fs_enet_private *fep = netdev_priv(dev);110 111 if (do_pd_setup(fep) != 0)112 return -EINVAL;113 114 fep->fec.hthi = 0;115 fep->fec.htlo = 0;116 117 fep->ev_napi = FEC_NAPI_EVENT_MSK;118 fep->ev = FEC_EVENT;119 fep->ev_err = FEC_ERR_EVENT_MSK;120 121 return 0;122}123 124static int allocate_bd(struct net_device *dev)125{126 struct fs_enet_private *fep = netdev_priv(dev);127 const struct fs_platform_info *fpi = fep->fpi;128 129 fep->ring_base = (void __force __iomem *)dma_alloc_coherent(fep->dev,130 (fpi->tx_ring + fpi->rx_ring) *131 sizeof(cbd_t), &fep->ring_mem_addr,132 GFP_KERNEL);133 if (fep->ring_base == NULL)134 return -ENOMEM;135 136 return 0;137}138 139static void free_bd(struct net_device *dev)140{141 struct fs_enet_private *fep = netdev_priv(dev);142 const struct fs_platform_info *fpi = fep->fpi;143 144 if(fep->ring_base)145 dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring)146 * sizeof(cbd_t),147 (void __force *)fep->ring_base,148 fep->ring_mem_addr);149}150 151static void cleanup_data(struct net_device *dev)152{153 /* nothing */154}155 156static void set_promiscuous_mode(struct net_device *dev)157{158 struct fs_enet_private *fep = netdev_priv(dev);159 struct fec __iomem *fecp = fep->fec.fecp;160 161 FS(fecp, r_cntrl, FEC_RCNTRL_PROM);162}163 164static void set_multicast_start(struct net_device *dev)165{166 struct fs_enet_private *fep = netdev_priv(dev);167 168 fep->fec.hthi = 0;169 fep->fec.htlo = 0;170}171 172static void set_multicast_one(struct net_device *dev, const u8 *mac)173{174 struct fs_enet_private *fep = netdev_priv(dev);175 int temp, hash_index;176 u32 crc, csrVal;177 178 crc = ether_crc(6, mac);179 180 temp = (crc & 0x3f) >> 1;181 hash_index = ((temp & 0x01) << 4) |182 ((temp & 0x02) << 2) |183 ((temp & 0x04)) |184 ((temp & 0x08) >> 2) |185 ((temp & 0x10) >> 4);186 csrVal = 1 << hash_index;187 if (crc & 1)188 fep->fec.hthi |= csrVal;189 else190 fep->fec.htlo |= csrVal;191}192 193static void set_multicast_finish(struct net_device *dev)194{195 struct fs_enet_private *fep = netdev_priv(dev);196 struct fec __iomem *fecp = fep->fec.fecp;197 198 /* if all multi or too many multicasts; just enable all */199 if ((dev->flags & IFF_ALLMULTI) != 0 ||200 netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) {201 fep->fec.hthi = 0xffffffffU;202 fep->fec.htlo = 0xffffffffU;203 }204 205 FC(fecp, r_cntrl, FEC_RCNTRL_PROM);206 FW(fecp, grp_hash_table_high, fep->fec.hthi);207 FW(fecp, grp_hash_table_low, fep->fec.htlo);208}209 210static void set_multicast_list(struct net_device *dev)211{212 struct netdev_hw_addr *ha;213 214 if ((dev->flags & IFF_PROMISC) == 0) {215 set_multicast_start(dev);216 netdev_for_each_mc_addr(ha, dev)217 set_multicast_one(dev, ha->addr);218 set_multicast_finish(dev);219 } else220 set_promiscuous_mode(dev);221}222 223static void restart(struct net_device *dev, phy_interface_t interface,224 int speed, int duplex)225{226 struct fs_enet_private *fep = netdev_priv(dev);227 struct fec __iomem *fecp = fep->fec.fecp;228 const struct fs_platform_info *fpi = fep->fpi;229 dma_addr_t rx_bd_base_phys, tx_bd_base_phys;230 int r;231 u32 addrhi, addrlo;232 233 struct mii_bus *mii = dev->phydev->mdio.bus;234 struct fec_info* fec_inf = mii->priv;235 236 r = whack_reset(fep->fec.fecp);237 if (r != 0)238 dev_err(fep->dev, "FEC Reset FAILED!\n");239 /*240 * Set station address.241 */242 addrhi = ((u32) dev->dev_addr[0] << 24) |243 ((u32) dev->dev_addr[1] << 16) |244 ((u32) dev->dev_addr[2] << 8) |245 (u32) dev->dev_addr[3];246 addrlo = ((u32) dev->dev_addr[4] << 24) |247 ((u32) dev->dev_addr[5] << 16);248 FW(fecp, addr_low, addrhi);249 FW(fecp, addr_high, addrlo);250 251 /*252 * Reset all multicast.253 */254 FW(fecp, grp_hash_table_high, fep->fec.hthi);255 FW(fecp, grp_hash_table_low, fep->fec.htlo);256 257 /*258 * Set maximum receive buffer size.259 */260 FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);261#ifdef CONFIG_FS_ENET_MPC5121_FEC262 FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16);263#else264 FW(fecp, r_hash, PKT_MAXBUF_SIZE);265#endif266 267 /* get physical address */268 rx_bd_base_phys = fep->ring_mem_addr;269 tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring;270 271 /*272 * Set receive and transmit descriptor base.273 */274 FW(fecp, r_des_start, rx_bd_base_phys);275 FW(fecp, x_des_start, tx_bd_base_phys);276 277 fs_init_bds(dev);278 279 /*280 * Enable big endian and don't care about SDMA FC.281 */282#ifdef CONFIG_FS_ENET_MPC5121_FEC283 FS(fecp, dma_control, 0xC0000000);284#else285 FW(fecp, fun_code, 0x78000000);286#endif287 288 /*289 * Set MII speed.290 */291 FW(fecp, mii_speed, fec_inf->mii_speed);292 293 /*294 * Clear any outstanding interrupt.295 */296 FW(fecp, ievent, 0xffc0);297#ifndef CONFIG_FS_ENET_MPC5121_FEC298 FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29);299 300 FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */301#else302 /*303 * Only set MII/RMII mode - do not touch maximum frame length304 * configured before.305 */306 FS(fecp, r_cntrl, interface == PHY_INTERFACE_MODE_RMII ?307 FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE);308#endif309 /*310 * adjust to duplex mode311 */312 if (duplex == DUPLEX_FULL) {313 FC(fecp, r_cntrl, FEC_RCNTRL_DRT);314 FS(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD enable */315 } else {316 FS(fecp, r_cntrl, FEC_RCNTRL_DRT);317 FC(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD disable */318 }319 320 /* Restore multicast and promiscuous settings */321 set_multicast_list(dev);322 323 /*324 * Enable interrupts we wish to service.325 */326 FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |327 FEC_ENET_RXF | FEC_ENET_RXB);328 329 /*330 * And last, enable the transmit and receive processing.331 */332 FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);333 FW(fecp, r_des_active, 0x01000000);334}335 336static void stop(struct net_device *dev)337{338 struct fs_enet_private *fep = netdev_priv(dev);339 struct fec __iomem *fecp = fep->fec.fecp;340 int i;341 342 if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)343 return; /* already down */344 345 FW(fecp, x_cntrl, 0x01); /* Graceful transmit stop */346 for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&347 i < FEC_RESET_DELAY; i++)348 udelay(1);349 350 if (i == FEC_RESET_DELAY)351 dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n");352 /*353 * Disable FEC. Let only MII interrupts.354 */355 FW(fecp, imask, 0);356 FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN);357 358 fs_cleanup_bds(dev);359}360 361static void napi_clear_event_fs(struct net_device *dev)362{363 struct fs_enet_private *fep = netdev_priv(dev);364 struct fec __iomem *fecp = fep->fec.fecp;365 366 FW(fecp, ievent, FEC_NAPI_EVENT_MSK);367}368 369static void napi_enable_fs(struct net_device *dev)370{371 struct fs_enet_private *fep = netdev_priv(dev);372 struct fec __iomem *fecp = fep->fec.fecp;373 374 FS(fecp, imask, FEC_NAPI_EVENT_MSK);375}376 377static void napi_disable_fs(struct net_device *dev)378{379 struct fs_enet_private *fep = netdev_priv(dev);380 struct fec __iomem *fecp = fep->fec.fecp;381 382 FC(fecp, imask, FEC_NAPI_EVENT_MSK);383}384 385static void rx_bd_done(struct net_device *dev)386{387 struct fs_enet_private *fep = netdev_priv(dev);388 struct fec __iomem *fecp = fep->fec.fecp;389 390 FW(fecp, r_des_active, 0x01000000);391}392 393static void tx_kickstart(struct net_device *dev)394{395 struct fs_enet_private *fep = netdev_priv(dev);396 struct fec __iomem *fecp = fep->fec.fecp;397 398 FW(fecp, x_des_active, 0x01000000);399}400 401static u32 get_int_events(struct net_device *dev)402{403 struct fs_enet_private *fep = netdev_priv(dev);404 struct fec __iomem *fecp = fep->fec.fecp;405 406 return FR(fecp, ievent) & FR(fecp, imask);407}408 409static void clear_int_events(struct net_device *dev, u32 int_events)410{411 struct fs_enet_private *fep = netdev_priv(dev);412 struct fec __iomem *fecp = fep->fec.fecp;413 414 FW(fecp, ievent, int_events);415}416 417static void ev_error(struct net_device *dev, u32 int_events)418{419 struct fs_enet_private *fep = netdev_priv(dev);420 421 dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events);422}423 424static int get_regs(struct net_device *dev, void *p, int *sizep)425{426 struct fs_enet_private *fep = netdev_priv(dev);427 428 if (*sizep < sizeof(struct fec))429 return -EINVAL;430 431 memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec));432 433 return 0;434}435 436static int get_regs_len(struct net_device *dev)437{438 return sizeof(struct fec);439}440 441static void tx_restart(struct net_device *dev)442{443 /* nothing */444}445 446/*************************************************************************/447 448const struct fs_ops fs_fec_ops = {449 .setup_data = setup_data,450 .cleanup_data = cleanup_data,451 .set_multicast_list = set_multicast_list,452 .restart = restart,453 .stop = stop,454 .napi_clear_event = napi_clear_event_fs,455 .napi_enable = napi_enable_fs,456 .napi_disable = napi_disable_fs,457 .rx_bd_done = rx_bd_done,458 .tx_kickstart = tx_kickstart,459 .get_int_events = get_int_events,460 .clear_int_events = clear_int_events,461 .ev_error = ev_error,462 .get_regs = get_regs,463 .get_regs_len = get_regs_len,464 .tx_restart = tx_restart,465 .allocate_bd = allocate_bd,466 .free_bd = free_bd,467};468 469