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/string.h>
19 #include <linux/ptrace.h>
20 #include <linux/errno.h>
21 #include <linux/ioport.h>
22 #include <linux/interrupt.h>
23 #include <linux/init.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>
33 #include <linux/platform_device.h>
34 #include <linux/of_platform.h>
37 #include <asm/uaccess.h>
40 #include <asm/8xx_immap.h>
41 #include <asm/pgtable.h>
42 #include <asm/mpc8xx.h>
48 /*************************************************/
49 #if defined(CONFIG_CPM1)
50 /* for a 8xx __raw_xxx's are sufficient */
51 #define __fs_out32(addr, x) __raw_writel(x, addr)
52 #define __fs_out16(addr, x) __raw_writew(x, addr)
53 #define __fs_out8(addr, x) __raw_writeb(x, addr)
54 #define __fs_in32(addr) __raw_readl(addr)
55 #define __fs_in16(addr) __raw_readw(addr)
56 #define __fs_in8(addr) __raw_readb(addr)
58 /* for others play it safe */
59 #define __fs_out32(addr, x) out_be32(addr, x)
60 #define __fs_out16(addr, x) out_be16(addr, x)
61 #define __fs_in32(addr) in_be32(addr)
62 #define __fs_in16(addr) in_be16(addr)
63 #define __fs_out8(addr, x) out_8(addr, x)
64 #define __fs_in8(addr) in_8(addr)
67 /* write, read, set bits, clear bits */
68 #define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
69 #define R32(_p, _m) __fs_in32(&(_p)->_m)
70 #define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
71 #define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
73 #define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
74 #define R16(_p, _m) __fs_in16(&(_p)->_m)
75 #define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
76 #define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
78 #define W8(_p, _m, _v) __fs_out8(&(_p)->_m, (_v))
79 #define R8(_p, _m) __fs_in8(&(_p)->_m)
80 #define S8(_p, _m, _v) W8(_p, _m, R8(_p, _m) | (_v))
81 #define C8(_p, _m, _v) W8(_p, _m, R8(_p, _m) & ~(_v))
83 #define SCC_MAX_MULTICAST_ADDRS 64
86 * Delay to wait for SCC reset command to complete (in us)
88 #define SCC_RESET_DELAY 50
90 static inline int scc_cr_cmd(struct fs_enet_private
*fep
, u32 op
)
92 const struct fs_platform_info
*fpi
= fep
->fpi
;
94 return cpm_command(fpi
->cp_command
, op
);
97 static int do_pd_setup(struct fs_enet_private
*fep
)
99 struct platform_device
*ofdev
= to_platform_device(fep
->dev
);
101 fep
->interrupt
= of_irq_to_resource(ofdev
->dev
.of_node
, 0, NULL
);
102 if (fep
->interrupt
== NO_IRQ
)
105 fep
->scc
.sccp
= of_iomap(ofdev
->dev
.of_node
, 0);
109 fep
->scc
.ep
= of_iomap(ofdev
->dev
.of_node
, 1);
111 iounmap(fep
->scc
.sccp
);
118 #define SCC_NAPI_RX_EVENT_MSK (SCCE_ENET_RXF | SCCE_ENET_RXB)
119 #define SCC_RX_EVENT (SCCE_ENET_RXF)
120 #define SCC_TX_EVENT (SCCE_ENET_TXB)
121 #define SCC_ERR_EVENT_MSK (SCCE_ENET_TXE | SCCE_ENET_BSY)
123 static int setup_data(struct net_device
*dev
)
125 struct fs_enet_private
*fep
= netdev_priv(dev
);
132 fep
->ev_napi_rx
= SCC_NAPI_RX_EVENT_MSK
;
133 fep
->ev_rx
= SCC_RX_EVENT
;
134 fep
->ev_tx
= SCC_TX_EVENT
| SCCE_ENET_TXE
;
135 fep
->ev_err
= SCC_ERR_EVENT_MSK
;
140 static int allocate_bd(struct net_device
*dev
)
142 struct fs_enet_private
*fep
= netdev_priv(dev
);
143 const struct fs_platform_info
*fpi
= fep
->fpi
;
145 fep
->ring_mem_addr
= cpm_dpalloc((fpi
->tx_ring
+ fpi
->rx_ring
) *
147 if (IS_ERR_VALUE(fep
->ring_mem_addr
))
150 fep
->ring_base
= (void __iomem __force
*)
151 cpm_dpram_addr(fep
->ring_mem_addr
);
156 static void free_bd(struct net_device
*dev
)
158 struct fs_enet_private
*fep
= netdev_priv(dev
);
161 cpm_dpfree(fep
->ring_mem_addr
);
164 static void cleanup_data(struct net_device
*dev
)
169 static void set_promiscuous_mode(struct net_device
*dev
)
171 struct fs_enet_private
*fep
= netdev_priv(dev
);
172 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
174 S16(sccp
, scc_psmr
, SCC_PSMR_PRO
);
177 static void set_multicast_start(struct net_device
*dev
)
179 struct fs_enet_private
*fep
= netdev_priv(dev
);
180 scc_enet_t __iomem
*ep
= fep
->scc
.ep
;
182 W16(ep
, sen_gaddr1
, 0);
183 W16(ep
, sen_gaddr2
, 0);
184 W16(ep
, sen_gaddr3
, 0);
185 W16(ep
, sen_gaddr4
, 0);
188 static void set_multicast_one(struct net_device
*dev
, const u8
* mac
)
190 struct fs_enet_private
*fep
= netdev_priv(dev
);
191 scc_enet_t __iomem
*ep
= fep
->scc
.ep
;
192 u16 taddrh
, taddrm
, taddrl
;
194 taddrh
= ((u16
) mac
[5] << 8) | mac
[4];
195 taddrm
= ((u16
) mac
[3] << 8) | mac
[2];
196 taddrl
= ((u16
) mac
[1] << 8) | mac
[0];
198 W16(ep
, sen_taddrh
, taddrh
);
199 W16(ep
, sen_taddrm
, taddrm
);
200 W16(ep
, sen_taddrl
, taddrl
);
201 scc_cr_cmd(fep
, CPM_CR_SET_GADDR
);
204 static void set_multicast_finish(struct net_device
*dev
)
206 struct fs_enet_private
*fep
= netdev_priv(dev
);
207 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
208 scc_enet_t __iomem
*ep
= fep
->scc
.ep
;
210 /* clear promiscuous always */
211 C16(sccp
, scc_psmr
, SCC_PSMR_PRO
);
213 /* if all multi or too many multicasts; just enable all */
214 if ((dev
->flags
& IFF_ALLMULTI
) != 0 ||
215 netdev_mc_count(dev
) > SCC_MAX_MULTICAST_ADDRS
) {
217 W16(ep
, sen_gaddr1
, 0xffff);
218 W16(ep
, sen_gaddr2
, 0xffff);
219 W16(ep
, sen_gaddr3
, 0xffff);
220 W16(ep
, sen_gaddr4
, 0xffff);
224 static void set_multicast_list(struct net_device
*dev
)
226 struct netdev_hw_addr
*ha
;
228 if ((dev
->flags
& IFF_PROMISC
) == 0) {
229 set_multicast_start(dev
);
230 netdev_for_each_mc_addr(ha
, dev
)
231 set_multicast_one(dev
, ha
->addr
);
232 set_multicast_finish(dev
);
234 set_promiscuous_mode(dev
);
238 * This function is called to start or restart the FEC during a link
239 * change. This only happens when switching between half and full
242 static void restart(struct net_device
*dev
)
244 struct fs_enet_private
*fep
= netdev_priv(dev
);
245 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
246 scc_enet_t __iomem
*ep
= fep
->scc
.ep
;
247 const struct fs_platform_info
*fpi
= fep
->fpi
;
248 u16 paddrh
, paddrm
, paddrl
;
249 const unsigned char *mac
;
252 C32(sccp
, scc_gsmrl
, SCC_GSMRL_ENR
| SCC_GSMRL_ENT
);
254 /* clear everything (slow & steady does it) */
255 for (i
= 0; i
< sizeof(*ep
); i
++)
256 __fs_out8((u8 __iomem
*)ep
+ i
, 0);
259 W16(ep
, sen_genscc
.scc_rbase
, fep
->ring_mem_addr
);
260 W16(ep
, sen_genscc
.scc_tbase
,
261 fep
->ring_mem_addr
+ sizeof(cbd_t
) * fpi
->rx_ring
);
263 /* Initialize function code registers for big-endian.
265 #ifndef CONFIG_NOT_COHERENT_CACHE
266 W8(ep
, sen_genscc
.scc_rfcr
, SCC_EB
| SCC_GBL
);
267 W8(ep
, sen_genscc
.scc_tfcr
, SCC_EB
| SCC_GBL
);
269 W8(ep
, sen_genscc
.scc_rfcr
, SCC_EB
);
270 W8(ep
, sen_genscc
.scc_tfcr
, SCC_EB
);
273 /* Set maximum bytes per receive buffer.
274 * This appears to be an Ethernet frame size, not the buffer
275 * fragment size. It must be a multiple of four.
277 W16(ep
, sen_genscc
.scc_mrblr
, 0x5f0);
279 /* Set CRC preset and mask.
281 W32(ep
, sen_cpres
, 0xffffffff);
282 W32(ep
, sen_cmask
, 0xdebb20e3);
284 W32(ep
, sen_crcec
, 0); /* CRC Error counter */
285 W32(ep
, sen_alec
, 0); /* alignment error counter */
286 W32(ep
, sen_disfc
, 0); /* discard frame counter */
288 W16(ep
, sen_pads
, 0x8888); /* Tx short frame pad character */
289 W16(ep
, sen_retlim
, 15); /* Retry limit threshold */
291 W16(ep
, sen_maxflr
, 0x5ee); /* maximum frame length register */
293 W16(ep
, sen_minflr
, PKT_MINBUF_SIZE
); /* minimum frame length register */
295 W16(ep
, sen_maxd1
, 0x000005f0); /* maximum DMA1 length */
296 W16(ep
, sen_maxd2
, 0x000005f0); /* maximum DMA2 length */
298 /* Clear hash tables.
300 W16(ep
, sen_gaddr1
, 0);
301 W16(ep
, sen_gaddr2
, 0);
302 W16(ep
, sen_gaddr3
, 0);
303 W16(ep
, sen_gaddr4
, 0);
304 W16(ep
, sen_iaddr1
, 0);
305 W16(ep
, sen_iaddr2
, 0);
306 W16(ep
, sen_iaddr3
, 0);
307 W16(ep
, sen_iaddr4
, 0);
312 paddrh
= ((u16
) mac
[5] << 8) | mac
[4];
313 paddrm
= ((u16
) mac
[3] << 8) | mac
[2];
314 paddrl
= ((u16
) mac
[1] << 8) | mac
[0];
316 W16(ep
, sen_paddrh
, paddrh
);
317 W16(ep
, sen_paddrm
, paddrm
);
318 W16(ep
, sen_paddrl
, paddrl
);
320 W16(ep
, sen_pper
, 0);
321 W16(ep
, sen_taddrl
, 0);
322 W16(ep
, sen_taddrm
, 0);
323 W16(ep
, sen_taddrh
, 0);
327 scc_cr_cmd(fep
, CPM_CR_INIT_TRX
);
329 W16(sccp
, scc_scce
, 0xffff);
331 /* Enable interrupts we wish to service.
333 W16(sccp
, scc_sccm
, SCCE_ENET_TXE
| SCCE_ENET_RXF
| SCCE_ENET_TXB
);
335 /* Set GSMR_H to enable all normal operating modes.
336 * Set GSMR_L to enable Ethernet to MC68160.
338 W32(sccp
, scc_gsmrh
, 0);
340 SCC_GSMRL_TCI
| SCC_GSMRL_TPL_48
| SCC_GSMRL_TPP_10
|
341 SCC_GSMRL_MODE_ENET
);
343 /* Set sync/delimiters.
345 W16(sccp
, scc_dsr
, 0xd555);
347 /* Set processing mode. Use Ethernet CRC, catch broadcast, and
348 * start frame search 22 bit times after RENA.
350 W16(sccp
, scc_psmr
, SCC_PSMR_ENCRC
| SCC_PSMR_NIB22
);
352 /* Set full duplex mode if needed */
353 if (fep
->phydev
->duplex
)
354 S16(sccp
, scc_psmr
, SCC_PSMR_LPB
| SCC_PSMR_FDE
);
356 S32(sccp
, scc_gsmrl
, SCC_GSMRL_ENR
| SCC_GSMRL_ENT
);
359 static void stop(struct net_device
*dev
)
361 struct fs_enet_private
*fep
= netdev_priv(dev
);
362 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
365 for (i
= 0; (R16(sccp
, scc_sccm
) == 0) && i
< SCC_RESET_DELAY
; i
++)
368 if (i
== SCC_RESET_DELAY
)
369 dev_warn(fep
->dev
, "SCC timeout on graceful transmit stop\n");
371 W16(sccp
, scc_sccm
, 0);
372 C32(sccp
, scc_gsmrl
, SCC_GSMRL_ENR
| SCC_GSMRL_ENT
);
377 static void napi_clear_rx_event(struct net_device
*dev
)
379 struct fs_enet_private
*fep
= netdev_priv(dev
);
380 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
382 W16(sccp
, scc_scce
, SCC_NAPI_RX_EVENT_MSK
);
385 static void napi_enable_rx(struct net_device
*dev
)
387 struct fs_enet_private
*fep
= netdev_priv(dev
);
388 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
390 S16(sccp
, scc_sccm
, SCC_NAPI_RX_EVENT_MSK
);
393 static void napi_disable_rx(struct net_device
*dev
)
395 struct fs_enet_private
*fep
= netdev_priv(dev
);
396 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
398 C16(sccp
, scc_sccm
, SCC_NAPI_RX_EVENT_MSK
);
401 static void rx_bd_done(struct net_device
*dev
)
406 static void tx_kickstart(struct net_device
*dev
)
411 static u32
get_int_events(struct net_device
*dev
)
413 struct fs_enet_private
*fep
= netdev_priv(dev
);
414 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
416 return (u32
) R16(sccp
, scc_scce
);
419 static void clear_int_events(struct net_device
*dev
, u32 int_events
)
421 struct fs_enet_private
*fep
= netdev_priv(dev
);
422 scc_t __iomem
*sccp
= fep
->scc
.sccp
;
424 W16(sccp
, scc_scce
, int_events
& 0xffff);
427 static void ev_error(struct net_device
*dev
, u32 int_events
)
429 struct fs_enet_private
*fep
= netdev_priv(dev
);
431 dev_warn(fep
->dev
, "SCC ERROR(s) 0x%x\n", int_events
);
434 static int get_regs(struct net_device
*dev
, void *p
, int *sizep
)
436 struct fs_enet_private
*fep
= netdev_priv(dev
);
438 if (*sizep
< sizeof(scc_t
) + sizeof(scc_enet_t __iomem
*))
441 memcpy_fromio(p
, fep
->scc
.sccp
, sizeof(scc_t
));
442 p
= (char *)p
+ sizeof(scc_t
);
444 memcpy_fromio(p
, fep
->scc
.ep
, sizeof(scc_enet_t __iomem
*));
449 static int get_regs_len(struct net_device
*dev
)
451 return sizeof(scc_t
) + sizeof(scc_enet_t __iomem
*);
454 static void tx_restart(struct net_device
*dev
)
456 struct fs_enet_private
*fep
= netdev_priv(dev
);
458 scc_cr_cmd(fep
, CPM_CR_RESTART_TX
);
463 /*************************************************************************/
465 const struct fs_ops fs_scc_ops
= {
466 .setup_data
= setup_data
,
467 .cleanup_data
= cleanup_data
,
468 .set_multicast_list
= set_multicast_list
,
471 .napi_clear_rx_event
= napi_clear_rx_event
,
472 .napi_enable_rx
= napi_enable_rx
,
473 .napi_disable_rx
= napi_disable_rx
,
474 .rx_bd_done
= rx_bd_done
,
475 .tx_kickstart
= tx_kickstart
,
476 .get_int_events
= get_int_events
,
477 .clear_int_events
= clear_int_events
,
478 .ev_error
= ev_error
,
479 .get_regs
= get_regs
,
480 .get_regs_len
= get_regs_len
,
481 .tx_restart
= tx_restart
,
482 .allocate_bd
= allocate_bd
,
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