2 * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.
4 * Copyright (c) 2003 Intracom S.A.
5 * by Pantelis Antoniou <panto@intracom.gr>
7 * 2005 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
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.
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/sched.h>
19 #include <linux/string.h>
20 #include <linux/ptrace.h>
21 #include <linux/errno.h>
22 #include <linux/ioport.h>
23 #include <linux/slab.h>
24 #include <linux/interrupt.h>
25 #include <linux/pci.h>
26 #include <linux/init.h>
27 #include <linux/delay.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
31 #include <linux/spinlock.h>
32 #include <linux/mii.h>
33 #include <linux/ethtool.h>
34 #include <linux/bitops.h>
36 #include <linux/platform_device.h>
39 #include <asm/uaccess.h>
42 #include <asm/8xx_immap.h>
43 #include <asm/pgtable.h>
44 #include <asm/mpc8xx.h>
45 #include <asm/commproc.h>
50 /*************************************************/
52 #if defined(CONFIG_CPM1)
53 /* for a 8xx __raw_xxx's are sufficient */
54 #define __fs_out32(addr, x) __raw_writel(x, addr)
55 #define __fs_out16(addr, x) __raw_writew(x, addr)
56 #define __fs_out8(addr, x) __raw_writeb(x, addr)
57 #define __fs_in32(addr) __raw_readl(addr)
58 #define __fs_in16(addr) __raw_readw(addr)
59 #define __fs_in8(addr) __raw_readb(addr)
61 /* for others play it safe */
62 #define __fs_out32(addr, x) out_be32(addr, x)
63 #define __fs_out16(addr, x) out_be16(addr, x)
64 #define __fs_in32(addr) in_be32(addr)
65 #define __fs_in16(addr) in_be16(addr)
68 /* write, read, set bits, clear bits */
69 #define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
70 #define R32(_p, _m) __fs_in32(&(_p)->_m)
71 #define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
72 #define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
74 #define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
75 #define R16(_p, _m) __fs_in16(&(_p)->_m)
76 #define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
77 #define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
79 #define W8(_p, _m, _v) __fs_out8(&(_p)->_m, (_v))
80 #define R8(_p, _m) __fs_in8(&(_p)->_m)
81 #define S8(_p, _m, _v) W8(_p, _m, R8(_p, _m) | (_v))
82 #define C8(_p, _m, _v) W8(_p, _m, R8(_p, _m) & ~(_v))
84 #define SCC_MAX_MULTICAST_ADDRS 64
87 * Delay to wait for SCC reset command to complete (in us)
89 #define SCC_RESET_DELAY 50
90 #define MAX_CR_CMD_LOOPS 10000
92 static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
94 cpm8xx_t *cpmp = &((immap_t *)fs_enet_immap)->im_cpm;
98 ch = fep->scc.idx << 2;
99 v = mk_cr_cmd(ch, op);
100 W16(cpmp, cp_cpcr, v | CPM_CR_FLG);
101 for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
102 if ((R16(cpmp, cp_cpcr) & CPM_CR_FLG) == 0)
105 if (i >= MAX_CR_CMD_LOOPS) {
106 printk(KERN_ERR "%s(): Not able to issue CPM command\n",
113 static int do_pd_setup(struct fs_enet_private *fep)
115 struct platform_device *pdev = to_platform_device(fep->dev);
118 /* Fill out IRQ field */
119 fep->interrupt = platform_get_irq_byname(pdev, "interrupt");
120 if (fep->interrupt < 0)
123 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
124 fep->scc.sccp = ioremap(r->start, r->end - r->start + 1);
126 if (fep->scc.sccp == NULL)
129 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram");
130 fep->scc.ep = ioremap(r->start, r->end - r->start + 1);
132 if (fep->scc.ep == NULL)
138 #define SCC_NAPI_RX_EVENT_MSK (SCCE_ENET_RXF | SCCE_ENET_RXB)
139 #define SCC_RX_EVENT (SCCE_ENET_RXF)
140 #define SCC_TX_EVENT (SCCE_ENET_TXB)
141 #define SCC_ERR_EVENT_MSK (SCCE_ENET_TXE | SCCE_ENET_BSY)
143 static int setup_data(struct net_device *dev)
145 struct fs_enet_private *fep = netdev_priv(dev);
146 const struct fs_platform_info *fpi = fep->fpi;
148 fep->scc.idx = fs_get_scc_index(fpi->fs_no);
149 if ((unsigned int)fep->fcc.idx > 4) /* max 4 SCCs */
157 fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
158 fep->ev_rx = SCC_RX_EVENT;
159 fep->ev_tx = SCC_TX_EVENT;
160 fep->ev_err = SCC_ERR_EVENT_MSK;
165 static int allocate_bd(struct net_device *dev)
167 struct fs_enet_private *fep = netdev_priv(dev);
168 const struct fs_platform_info *fpi = fep->fpi;
170 fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
172 if (IS_DPERR(fep->ring_mem_addr))
175 fep->ring_base = cpm_dpram_addr(fep->ring_mem_addr);
180 static void free_bd(struct net_device *dev)
182 struct fs_enet_private *fep = netdev_priv(dev);
185 cpm_dpfree(fep->ring_mem_addr);
188 static void cleanup_data(struct net_device *dev)
193 static void set_promiscuous_mode(struct net_device *dev)
195 struct fs_enet_private *fep = netdev_priv(dev);
196 scc_t *sccp = fep->scc.sccp;
198 S16(sccp, scc_psmr, SCC_PSMR_PRO);
201 static void set_multicast_start(struct net_device *dev)
203 struct fs_enet_private *fep = netdev_priv(dev);
204 scc_enet_t *ep = fep->scc.ep;
206 W16(ep, sen_gaddr1, 0);
207 W16(ep, sen_gaddr2, 0);
208 W16(ep, sen_gaddr3, 0);
209 W16(ep, sen_gaddr4, 0);
212 static void set_multicast_one(struct net_device *dev, const u8 * mac)
214 struct fs_enet_private *fep = netdev_priv(dev);
215 scc_enet_t *ep = fep->scc.ep;
216 u16 taddrh, taddrm, taddrl;
218 taddrh = ((u16) mac[5] << 8) | mac[4];
219 taddrm = ((u16) mac[3] << 8) | mac[2];
220 taddrl = ((u16) mac[1] << 8) | mac[0];
222 W16(ep, sen_taddrh, taddrh);
223 W16(ep, sen_taddrm, taddrm);
224 W16(ep, sen_taddrl, taddrl);
225 scc_cr_cmd(fep, CPM_CR_SET_GADDR);
228 static void set_multicast_finish(struct net_device *dev)
230 struct fs_enet_private *fep = netdev_priv(dev);
231 scc_t *sccp = fep->scc.sccp;
232 scc_enet_t *ep = fep->scc.ep;
234 /* clear promiscuous always */
235 C16(sccp, scc_psmr, SCC_PSMR_PRO);
237 /* if all multi or too many multicasts; just enable all */
238 if ((dev->flags & IFF_ALLMULTI) != 0 ||
239 dev->mc_count > SCC_MAX_MULTICAST_ADDRS) {
241 W16(ep, sen_gaddr1, 0xffff);
242 W16(ep, sen_gaddr2, 0xffff);
243 W16(ep, sen_gaddr3, 0xffff);
244 W16(ep, sen_gaddr4, 0xffff);
248 static void set_multicast_list(struct net_device *dev)
250 struct dev_mc_list *pmc;
252 if ((dev->flags & IFF_PROMISC) == 0) {
253 set_multicast_start(dev);
254 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next)
255 set_multicast_one(dev, pmc->dmi_addr);
256 set_multicast_finish(dev);
258 set_promiscuous_mode(dev);
262 * This function is called to start or restart the FEC during a link
263 * change. This only happens when switching between half and full
266 static void restart(struct net_device *dev)
268 struct fs_enet_private *fep = netdev_priv(dev);
269 scc_t *sccp = fep->scc.sccp;
270 scc_enet_t *ep = fep->scc.ep;
271 const struct fs_platform_info *fpi = fep->fpi;
272 u16 paddrh, paddrm, paddrl;
273 const unsigned char *mac;
276 C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
278 /* clear everything (slow & steady does it) */
279 for (i = 0; i < sizeof(*ep); i++)
280 __fs_out8((char *)ep + i, 0);
283 W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
284 W16(ep, sen_genscc.scc_tbase,
285 fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
287 /* Initialize function code registers for big-endian.
289 W8(ep, sen_genscc.scc_rfcr, SCC_EB);
290 W8(ep, sen_genscc.scc_tfcr, SCC_EB);
292 /* Set maximum bytes per receive buffer.
293 * This appears to be an Ethernet frame size, not the buffer
294 * fragment size. It must be a multiple of four.
296 W16(ep, sen_genscc.scc_mrblr, 0x5f0);
298 /* Set CRC preset and mask.
300 W32(ep, sen_cpres, 0xffffffff);
301 W32(ep, sen_cmask, 0xdebb20e3);
303 W32(ep, sen_crcec, 0); /* CRC Error counter */
304 W32(ep, sen_alec, 0); /* alignment error counter */
305 W32(ep, sen_disfc, 0); /* discard frame counter */
307 W16(ep, sen_pads, 0x8888); /* Tx short frame pad character */
308 W16(ep, sen_retlim, 15); /* Retry limit threshold */
310 W16(ep, sen_maxflr, 0x5ee); /* maximum frame length register */
312 W16(ep, sen_minflr, PKT_MINBUF_SIZE); /* minimum frame length register */
314 W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
315 W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
317 /* Clear hash tables.
319 W16(ep, sen_gaddr1, 0);
320 W16(ep, sen_gaddr2, 0);
321 W16(ep, sen_gaddr3, 0);
322 W16(ep, sen_gaddr4, 0);
323 W16(ep, sen_iaddr1, 0);
324 W16(ep, sen_iaddr2, 0);
325 W16(ep, sen_iaddr3, 0);
326 W16(ep, sen_iaddr4, 0);
331 paddrh = ((u16) mac[5] << 8) | mac[4];
332 paddrm = ((u16) mac[3] << 8) | mac[2];
333 paddrl = ((u16) mac[1] << 8) | mac[0];
335 W16(ep, sen_paddrh, paddrh);
336 W16(ep, sen_paddrm, paddrm);
337 W16(ep, sen_paddrl, paddrl);
339 W16(ep, sen_pper, 0);
340 W16(ep, sen_taddrl, 0);
341 W16(ep, sen_taddrm, 0);
342 W16(ep, sen_taddrh, 0);
346 scc_cr_cmd(fep, CPM_CR_INIT_TRX);
348 W16(sccp, scc_scce, 0xffff);
350 /* Enable interrupts we wish to service.
352 W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
354 /* Set GSMR_H to enable all normal operating modes.
355 * Set GSMR_L to enable Ethernet to MC68160.
357 W32(sccp, scc_gsmrh, 0);
359 SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
360 SCC_GSMRL_MODE_ENET);
362 /* Set sync/delimiters.
364 W16(sccp, scc_dsr, 0xd555);
366 /* Set processing mode. Use Ethernet CRC, catch broadcast, and
367 * start frame search 22 bit times after RENA.
369 W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
371 /* Set full duplex mode if needed */
372 if (fep->phydev->duplex)
373 S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
375 S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
378 static void stop(struct net_device *dev)
380 struct fs_enet_private *fep = netdev_priv(dev);
381 scc_t *sccp = fep->scc.sccp;
384 for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
387 if (i == SCC_RESET_DELAY)
388 printk(KERN_WARNING DRV_MODULE_NAME
389 ": %s SCC timeout on graceful transmit stop\n",
392 W16(sccp, scc_sccm, 0);
393 C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
398 static void pre_request_irq(struct net_device *dev, int irq)
400 #ifndef CONFIG_PPC_MERGE
401 immap_t *immap = fs_enet_immap;
405 if (irq >= SIU_IRQ0 && irq < SIU_LEVEL7) {
407 siel = in_be32(&immap->im_siu_conf.sc_siel);
409 siel |= (0x80000000 >> irq);
411 siel &= ~(0x80000000 >> (irq & ~1));
412 out_be32(&immap->im_siu_conf.sc_siel, siel);
417 static void post_free_irq(struct net_device *dev, int irq)
422 static void napi_clear_rx_event(struct net_device *dev)
424 struct fs_enet_private *fep = netdev_priv(dev);
425 scc_t *sccp = fep->scc.sccp;
427 W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
430 static void napi_enable_rx(struct net_device *dev)
432 struct fs_enet_private *fep = netdev_priv(dev);
433 scc_t *sccp = fep->scc.sccp;
435 S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
438 static void napi_disable_rx(struct net_device *dev)
440 struct fs_enet_private *fep = netdev_priv(dev);
441 scc_t *sccp = fep->scc.sccp;
443 C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
446 static void rx_bd_done(struct net_device *dev)
451 static void tx_kickstart(struct net_device *dev)
456 static u32 get_int_events(struct net_device *dev)
458 struct fs_enet_private *fep = netdev_priv(dev);
459 scc_t *sccp = fep->scc.sccp;
461 return (u32) R16(sccp, scc_scce);
464 static void clear_int_events(struct net_device *dev, u32 int_events)
466 struct fs_enet_private *fep = netdev_priv(dev);
467 scc_t *sccp = fep->scc.sccp;
469 W16(sccp, scc_scce, int_events & 0xffff);
472 static void ev_error(struct net_device *dev, u32 int_events)
474 printk(KERN_WARNING DRV_MODULE_NAME
475 ": %s SCC ERROR(s) 0x%x\n", dev->name, int_events);
478 static int get_regs(struct net_device *dev, void *p, int *sizep)
480 struct fs_enet_private *fep = netdev_priv(dev);
482 if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t))
485 memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
486 p = (char *)p + sizeof(scc_t);
488 memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t));
493 static int get_regs_len(struct net_device *dev)
495 return sizeof(scc_t) + sizeof(scc_enet_t);
498 static void tx_restart(struct net_device *dev)
500 struct fs_enet_private *fep = netdev_priv(dev);
502 scc_cr_cmd(fep, CPM_CR_RESTART_TX);
507 /*************************************************************************/
509 const struct fs_ops fs_scc_ops = {
510 .setup_data = setup_data,
511 .cleanup_data = cleanup_data,
512 .set_multicast_list = set_multicast_list,
515 .pre_request_irq = pre_request_irq,
516 .post_free_irq = post_free_irq,
517 .napi_clear_rx_event = napi_clear_rx_event,
518 .napi_enable_rx = napi_enable_rx,
519 .napi_disable_rx = napi_disable_rx,
520 .rx_bd_done = rx_bd_done,
521 .tx_kickstart = tx_kickstart,
522 .get_int_events = get_int_events,
523 .clear_int_events = clear_int_events,
524 .ev_error = ev_error,
525 .get_regs = get_regs,
526 .get_regs_len = get_regs_len,
527 .tx_restart = tx_restart,
528 .allocate_bd = allocate_bd,