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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.4 *5 * Copyright (c) 2003 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/ioport.h>19#include <linux/interrupt.h>20#include <linux/delay.h>21#include <linux/netdevice.h>22#include <linux/etherdevice.h>23#include <linux/skbuff.h>24#include <linux/spinlock.h>25#include <linux/ethtool.h>26#include <linux/bitops.h>27#include <linux/fs.h>28#include <linux/platform_device.h>29#include <linux/of_address.h>30#include <linux/of_irq.h>31 32#include <asm/irq.h>33#include <linux/uaccess.h>34 35#include "fs_enet.h"36 37/*************************************************/38#if defined(CONFIG_CPM1)39/* for a 8xx __raw_xxx's are sufficient */40#define __fs_out32(addr, x)	__raw_writel(x, addr)41#define __fs_out16(addr, x)	__raw_writew(x, addr)42#define __fs_out8(addr, x)	__raw_writeb(x, addr)43#define __fs_in32(addr)	__raw_readl(addr)44#define __fs_in16(addr)	__raw_readw(addr)45#define __fs_in8(addr)	__raw_readb(addr)46#else47/* for others play it safe */48#define __fs_out32(addr, x)	out_be32(addr, x)49#define __fs_out16(addr, x)	out_be16(addr, x)50#define __fs_in32(addr)	in_be32(addr)51#define __fs_in16(addr)	in_be16(addr)52#define __fs_out8(addr, x)	out_8(addr, x)53#define __fs_in8(addr)	in_8(addr)54#endif55 56/* write, read, set bits, clear bits */57#define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))58#define R32(_p, _m)     __fs_in32(&(_p)->_m)59#define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))60#define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))61 62#define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))63#define R16(_p, _m)     __fs_in16(&(_p)->_m)64#define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))65#define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))66 67#define W8(_p, _m, _v)  __fs_out8(&(_p)->_m, (_v))68#define R8(_p, _m)      __fs_in8(&(_p)->_m)69#define S8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) | (_v))70#define C8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) & ~(_v))71 72#define SCC_MAX_MULTICAST_ADDRS	6473 74/*75 * Delay to wait for SCC reset command to complete (in us)76 */77#define SCC_RESET_DELAY		5078 79static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)80{81	const struct fs_platform_info *fpi = fep->fpi;82 83	return cpm_command(fpi->cp_command, op);84}85 86static int do_pd_setup(struct fs_enet_private *fep)87{88	struct platform_device *ofdev = to_platform_device(fep->dev);89 90	fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0);91	if (!fep->interrupt)92		return -EINVAL;93 94	fep->scc.sccp = of_iomap(ofdev->dev.of_node, 0);95	if (!fep->scc.sccp)96		return -EINVAL;97 98	fep->scc.ep = of_iomap(ofdev->dev.of_node, 1);99	if (!fep->scc.ep) {100		iounmap(fep->scc.sccp);101		return -EINVAL;102	}103 104	return 0;105}106 107#define SCC_NAPI_EVENT_MSK	(SCCE_ENET_RXF | SCCE_ENET_RXB | SCCE_ENET_TXB)108#define SCC_EVENT		(SCCE_ENET_RXF | SCCE_ENET_TXB)109#define SCC_ERR_EVENT_MSK	(SCCE_ENET_TXE | SCCE_ENET_BSY)110 111static int setup_data(struct net_device *dev)112{113	struct fs_enet_private *fep = netdev_priv(dev);114 115	do_pd_setup(fep);116 117	fep->scc.hthi = 0;118	fep->scc.htlo = 0;119 120	fep->ev_napi = SCC_NAPI_EVENT_MSK;121	fep->ev = SCC_EVENT | SCCE_ENET_TXE;122	fep->ev_err = SCC_ERR_EVENT_MSK;123 124	return 0;125}126 127static int allocate_bd(struct net_device *dev)128{129	struct fs_enet_private *fep = netdev_priv(dev);130	struct fs_platform_info *fpi = fep->fpi;131 132	fpi->dpram_offset = cpm_muram_alloc((fpi->tx_ring + fpi->rx_ring) *133					    sizeof(cbd_t), 8);134	if (IS_ERR_VALUE(fpi->dpram_offset))135		return -ENOMEM;136 137	fep->ring_base = cpm_muram_addr(fpi->dpram_offset);138 139	return 0;140}141 142static void free_bd(struct net_device *dev)143{144	struct fs_enet_private *fep = netdev_priv(dev);145	const struct fs_platform_info *fpi = fep->fpi;146 147	if (fep->ring_base)148		cpm_muram_free(fpi->dpram_offset);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	scc_t __iomem *sccp = fep->scc.sccp;160 161	S16(sccp, scc_psmr, SCC_PSMR_PRO);162}163 164static void set_multicast_start(struct net_device *dev)165{166	struct fs_enet_private *fep = netdev_priv(dev);167	scc_enet_t __iomem *ep = fep->scc.ep;168 169	W16(ep, sen_gaddr1, 0);170	W16(ep, sen_gaddr2, 0);171	W16(ep, sen_gaddr3, 0);172	W16(ep, sen_gaddr4, 0);173}174 175static void set_multicast_one(struct net_device *dev, const u8 * mac)176{177	struct fs_enet_private *fep = netdev_priv(dev);178	scc_enet_t __iomem *ep = fep->scc.ep;179	u16 taddrh, taddrm, taddrl;180 181	taddrh = ((u16) mac[5] << 8) | mac[4];182	taddrm = ((u16) mac[3] << 8) | mac[2];183	taddrl = ((u16) mac[1] << 8) | mac[0];184 185	W16(ep, sen_taddrh, taddrh);186	W16(ep, sen_taddrm, taddrm);187	W16(ep, sen_taddrl, taddrl);188	scc_cr_cmd(fep, CPM_CR_SET_GADDR);189}190 191static void set_multicast_finish(struct net_device *dev)192{193	struct fs_enet_private *fep = netdev_priv(dev);194	scc_t __iomem *sccp = fep->scc.sccp;195	scc_enet_t __iomem *ep = fep->scc.ep;196 197	/* clear promiscuous always */198	C16(sccp, scc_psmr, SCC_PSMR_PRO);199 200	/* if all multi or too many multicasts; just enable all */201	if ((dev->flags & IFF_ALLMULTI) != 0 ||202	    netdev_mc_count(dev) > SCC_MAX_MULTICAST_ADDRS) {203 204		W16(ep, sen_gaddr1, 0xffff);205		W16(ep, sen_gaddr2, 0xffff);206		W16(ep, sen_gaddr3, 0xffff);207		W16(ep, sen_gaddr4, 0xffff);208	}209}210 211static void set_multicast_list(struct net_device *dev)212{213	struct netdev_hw_addr *ha;214 215	if ((dev->flags & IFF_PROMISC) == 0) {216		set_multicast_start(dev);217		netdev_for_each_mc_addr(ha, dev)218			set_multicast_one(dev, ha->addr);219		set_multicast_finish(dev);220	} else221		set_promiscuous_mode(dev);222}223 224/*225 * This function is called to start or restart the FEC during a link226 * change.  This only happens when switching between half and full227 * duplex.228 */229static void restart(struct net_device *dev, phy_interface_t interface,230		    int speed, int duplex)231{232	struct fs_enet_private *fep = netdev_priv(dev);233	scc_t __iomem *sccp = fep->scc.sccp;234	scc_enet_t __iomem *ep = fep->scc.ep;235	const struct fs_platform_info *fpi = fep->fpi;236	u16 paddrh, paddrm, paddrl;237	const unsigned char *mac;238	int i;239 240	C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);241 242	/* clear everything (slow & steady does it) */243	for (i = 0; i < sizeof(*ep); i++)244		__fs_out8((u8 __iomem *)ep + i, 0);245 246	/* point to bds */247	W16(ep, sen_genscc.scc_rbase, fpi->dpram_offset);248	W16(ep, sen_genscc.scc_tbase,249	    fpi->dpram_offset + sizeof(cbd_t) * fpi->rx_ring);250 251	/* Initialize function code registers for big-endian.252	 */253#ifndef CONFIG_NOT_COHERENT_CACHE254	W8(ep, sen_genscc.scc_rfcr, SCC_EB | SCC_GBL);255	W8(ep, sen_genscc.scc_tfcr, SCC_EB | SCC_GBL);256#else257	W8(ep, sen_genscc.scc_rfcr, SCC_EB);258	W8(ep, sen_genscc.scc_tfcr, SCC_EB);259#endif260 261	/* Set maximum bytes per receive buffer.262	 * This appears to be an Ethernet frame size, not the buffer263	 * fragment size.  It must be a multiple of four.264	 */265	W16(ep, sen_genscc.scc_mrblr, 0x5f0);266 267	/* Set CRC preset and mask.268	 */269	W32(ep, sen_cpres, 0xffffffff);270	W32(ep, sen_cmask, 0xdebb20e3);271 272	W32(ep, sen_crcec, 0);	/* CRC Error counter */273	W32(ep, sen_alec, 0);	/* alignment error counter */274	W32(ep, sen_disfc, 0);	/* discard frame counter */275 276	W16(ep, sen_pads, 0x8888);	/* Tx short frame pad character */277	W16(ep, sen_retlim, 15);	/* Retry limit threshold */278 279	W16(ep, sen_maxflr, 0x5ee);	/* maximum frame length register */280 281	W16(ep, sen_minflr, PKT_MINBUF_SIZE);	/* minimum frame length register */282 283	W16(ep, sen_maxd1, 0x000005f0);	/* maximum DMA1 length */284	W16(ep, sen_maxd2, 0x000005f0);	/* maximum DMA2 length */285 286	/* Clear hash tables.287	 */288	W16(ep, sen_gaddr1, 0);289	W16(ep, sen_gaddr2, 0);290	W16(ep, sen_gaddr3, 0);291	W16(ep, sen_gaddr4, 0);292	W16(ep, sen_iaddr1, 0);293	W16(ep, sen_iaddr2, 0);294	W16(ep, sen_iaddr3, 0);295	W16(ep, sen_iaddr4, 0);296 297	/* set address298	 */299	mac = dev->dev_addr;300	paddrh = ((u16) mac[5] << 8) | mac[4];301	paddrm = ((u16) mac[3] << 8) | mac[2];302	paddrl = ((u16) mac[1] << 8) | mac[0];303 304	W16(ep, sen_paddrh, paddrh);305	W16(ep, sen_paddrm, paddrm);306	W16(ep, sen_paddrl, paddrl);307 308	W16(ep, sen_pper, 0);309	W16(ep, sen_taddrl, 0);310	W16(ep, sen_taddrm, 0);311	W16(ep, sen_taddrh, 0);312 313	fs_init_bds(dev);314 315	scc_cr_cmd(fep, CPM_CR_INIT_TRX);316 317	W16(sccp, scc_scce, 0xffff);318 319	/* Enable interrupts we wish to service.320	 */321	W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);322 323	/* Set GSMR_H to enable all normal operating modes.324	 * Set GSMR_L to enable Ethernet to MC68160.325	 */326	W32(sccp, scc_gsmrh, 0);327	W32(sccp, scc_gsmrl,328	    SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |329	    SCC_GSMRL_MODE_ENET);330 331	/* Set sync/delimiters.332	 */333	W16(sccp, scc_dsr, 0xd555);334 335	/* Set processing mode.  Use Ethernet CRC, catch broadcast, and336	 * start frame search 22 bit times after RENA.337	 */338	W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);339 340	/* Set full duplex mode if needed */341	if (duplex == DUPLEX_FULL)342		S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);343 344	/* Restore multicast and promiscuous settings */345	set_multicast_list(dev);346 347	S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);348}349 350static void stop(struct net_device *dev)351{352	struct fs_enet_private *fep = netdev_priv(dev);353	scc_t __iomem *sccp = fep->scc.sccp;354	int i;355 356	for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)357		udelay(1);358 359	if (i == SCC_RESET_DELAY)360		dev_warn(fep->dev, "SCC timeout on graceful transmit stop\n");361 362	W16(sccp, scc_sccm, 0);363	C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);364 365	fs_cleanup_bds(dev);366}367 368static void napi_clear_event_fs(struct net_device *dev)369{370	struct fs_enet_private *fep = netdev_priv(dev);371	scc_t __iomem *sccp = fep->scc.sccp;372 373	W16(sccp, scc_scce, SCC_NAPI_EVENT_MSK);374}375 376static void napi_enable_fs(struct net_device *dev)377{378	struct fs_enet_private *fep = netdev_priv(dev);379	scc_t __iomem *sccp = fep->scc.sccp;380 381	S16(sccp, scc_sccm, SCC_NAPI_EVENT_MSK);382}383 384static void napi_disable_fs(struct net_device *dev)385{386	struct fs_enet_private *fep = netdev_priv(dev);387	scc_t __iomem *sccp = fep->scc.sccp;388 389	C16(sccp, scc_sccm, SCC_NAPI_EVENT_MSK);390}391 392static void rx_bd_done(struct net_device *dev)393{394	/* nothing */395}396 397static void tx_kickstart(struct net_device *dev)398{399	/* nothing */400}401 402static u32 get_int_events(struct net_device *dev)403{404	struct fs_enet_private *fep = netdev_priv(dev);405	scc_t __iomem *sccp = fep->scc.sccp;406 407	return (u32) R16(sccp, scc_scce);408}409 410static void clear_int_events(struct net_device *dev, u32 int_events)411{412	struct fs_enet_private *fep = netdev_priv(dev);413	scc_t __iomem *sccp = fep->scc.sccp;414 415	W16(sccp, scc_scce, int_events & 0xffff);416}417 418static void ev_error(struct net_device *dev, u32 int_events)419{420	struct fs_enet_private *fep = netdev_priv(dev);421 422	dev_warn(fep->dev, "SCC ERROR(s) 0x%x\n", int_events);423}424 425static int get_regs(struct net_device *dev, void *p, int *sizep)426{427	struct fs_enet_private *fep = netdev_priv(dev);428 429	if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))430		return -EINVAL;431 432	memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));433	p = (char *)p + sizeof(scc_t);434 435	memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));436 437	return 0;438}439 440static int get_regs_len(struct net_device *dev)441{442	return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);443}444 445static void tx_restart(struct net_device *dev)446{447	struct fs_enet_private *fep = netdev_priv(dev);448 449	scc_cr_cmd(fep, CPM_CR_RESTART_TX);450}451 452 453 454/*************************************************************************/455 456const struct fs_ops fs_scc_ops = {457	.setup_data		= setup_data,458	.cleanup_data		= cleanup_data,459	.set_multicast_list	= set_multicast_list,460	.restart		= restart,461	.stop			= stop,462	.napi_clear_event	= napi_clear_event_fs,463	.napi_enable		= napi_enable_fs,464	.napi_disable		= napi_disable_fs,465	.rx_bd_done		= rx_bd_done,466	.tx_kickstart		= tx_kickstart,467	.get_int_events		= get_int_events,468	.clear_int_events	= clear_int_events,469	.ev_error		= ev_error,470	.get_regs		= get_regs,471	.get_regs_len		= get_regs_len,472	.tx_restart		= tx_restart,473	.allocate_bd		= allocate_bd,474	.free_bd		= free_bd,475};476