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1/*
2 * DaVinci Ethernet Medium Access Controller
3 *
4 * DaVinci EMAC is based upon CPPI 3.0 TI DMA engine
5 *
6 * Copyright (C) 2009 Texas Instruments.
7 *
8 * ---------------------------------------------------------------------------
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * ---------------------------------------------------------------------------
24 * History:
25 * 0-5 A number of folks worked on this driver in bits and pieces but the major
26 * contribution came from Suraj Iyer and Anant Gole
27 * 6.0 Anant Gole - rewrote the driver as per Linux conventions
28 * 6.1 Chaithrika U S - added support for Gigabit and RMII features,
29 * PHY layer usage
30 */
31
32#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/sched.h>
35#include <linux/string.h>
36#include <linux/timer.h>
37#include <linux/errno.h>
38#include <linux/in.h>
39#include <linux/ioport.h>
40#include <linux/slab.h>
41#include <linux/mm.h>
42#include <linux/interrupt.h>
43#include <linux/init.h>
44#include <linux/netdevice.h>
45#include <linux/etherdevice.h>
46#include <linux/skbuff.h>
47#include <linux/ethtool.h>
48#include <linux/highmem.h>
49#include <linux/proc_fs.h>
50#include <linux/ctype.h>
51#include <linux/spinlock.h>
52#include <linux/dma-mapping.h>
53#include <linux/clk.h>
54#include <linux/platform_device.h>
55#include <linux/semaphore.h>
56#include <linux/phy.h>
57#include <linux/bitops.h>
58#include <linux/io.h>
59#include <linux/uaccess.h>
60#include <linux/davinci_emac.h>
61
62#include <asm/irq.h>
63#include <asm/page.h>
64
65#include "davinci_cpdma.h"
66
67static int debug_level;
68module_param(debug_level, int, 0);
69MODULE_PARM_DESC(debug_level, "DaVinci EMAC debug level (NETIF_MSG bits)");
70
71/* Netif debug messages possible */
72#define DAVINCI_EMAC_DEBUG (NETIF_MSG_DRV | \
73 NETIF_MSG_PROBE | \
74 NETIF_MSG_LINK | \
75 NETIF_MSG_TIMER | \
76 NETIF_MSG_IFDOWN | \
77 NETIF_MSG_IFUP | \
78 NETIF_MSG_RX_ERR | \
79 NETIF_MSG_TX_ERR | \
80 NETIF_MSG_TX_QUEUED | \
81 NETIF_MSG_INTR | \
82 NETIF_MSG_TX_DONE | \
83 NETIF_MSG_RX_STATUS | \
84 NETIF_MSG_PKTDATA | \
85 NETIF_MSG_HW | \
86 NETIF_MSG_WOL)
87
88/* version info */
89#define EMAC_MAJOR_VERSION 6
90#define EMAC_MINOR_VERSION 1
91#define EMAC_MODULE_VERSION "6.1"
92MODULE_VERSION(EMAC_MODULE_VERSION);
93static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
94
95/* Configuration items */
96#define EMAC_DEF_PASS_CRC (0) /* Do not pass CRC up to frames */
97#define EMAC_DEF_QOS_EN (0) /* EMAC proprietary QoS disabled */
98#define EMAC_DEF_NO_BUFF_CHAIN (0) /* No buffer chain */
99#define EMAC_DEF_MACCTRL_FRAME_EN (0) /* Discard Maccontrol frames */
100#define EMAC_DEF_SHORT_FRAME_EN (0) /* Discard short frames */
101#define EMAC_DEF_ERROR_FRAME_EN (0) /* Discard error frames */
102#define EMAC_DEF_PROM_EN (0) /* Promiscuous disabled */
103#define EMAC_DEF_PROM_CH (0) /* Promiscuous channel is 0 */
104#define EMAC_DEF_BCAST_EN (1) /* Broadcast enabled */
105#define EMAC_DEF_BCAST_CH (0) /* Broadcast channel is 0 */
106#define EMAC_DEF_MCAST_EN (1) /* Multicast enabled */
107#define EMAC_DEF_MCAST_CH (0) /* Multicast channel is 0 */
108
109#define EMAC_DEF_TXPRIO_FIXED (1) /* TX Priority is fixed */
110#define EMAC_DEF_TXPACING_EN (0) /* TX pacing NOT supported*/
111
112#define EMAC_DEF_BUFFER_OFFSET (0) /* Buffer offset to DMA (future) */
113#define EMAC_DEF_MIN_ETHPKTSIZE (60) /* Minimum ethernet pkt size */
114#define EMAC_DEF_MAX_FRAME_SIZE (1500 + 14 + 4 + 4)
115#define EMAC_DEF_TX_CH (0) /* Default 0th channel */
116#define EMAC_DEF_RX_CH (0) /* Default 0th channel */
117#define EMAC_DEF_RX_NUM_DESC (128)
118#define EMAC_DEF_MAX_TX_CH (1) /* Max TX channels configured */
119#define EMAC_DEF_MAX_RX_CH (1) /* Max RX channels configured */
120#define EMAC_POLL_WEIGHT (64) /* Default NAPI poll weight */
121
122/* Buffer descriptor parameters */
123#define EMAC_DEF_TX_MAX_SERVICE (32) /* TX max service BD's */
124#define EMAC_DEF_RX_MAX_SERVICE (64) /* should = netdev->weight */
125
126/* EMAC register related defines */
127#define EMAC_ALL_MULTI_REG_VALUE (0xFFFFFFFF)
128#define EMAC_NUM_MULTICAST_BITS (64)
129#define EMAC_TX_CONTROL_TX_ENABLE_VAL (0x1)
130#define EMAC_RX_CONTROL_RX_ENABLE_VAL (0x1)
131#define EMAC_MAC_HOST_ERR_INTMASK_VAL (0x2)
132#define EMAC_RX_UNICAST_CLEAR_ALL (0xFF)
133#define EMAC_INT_MASK_CLEAR (0xFF)
134
135/* RX MBP register bit positions */
136#define EMAC_RXMBP_PASSCRC_MASK BIT(30)
137#define EMAC_RXMBP_QOSEN_MASK BIT(29)
138#define EMAC_RXMBP_NOCHAIN_MASK BIT(28)
139#define EMAC_RXMBP_CMFEN_MASK BIT(24)
140#define EMAC_RXMBP_CSFEN_MASK BIT(23)
141#define EMAC_RXMBP_CEFEN_MASK BIT(22)
142#define EMAC_RXMBP_CAFEN_MASK BIT(21)
143#define EMAC_RXMBP_PROMCH_SHIFT (16)
144#define EMAC_RXMBP_PROMCH_MASK (0x7 << 16)
145#define EMAC_RXMBP_BROADEN_MASK BIT(13)
146#define EMAC_RXMBP_BROADCH_SHIFT (8)
147#define EMAC_RXMBP_BROADCH_MASK (0x7 << 8)
148#define EMAC_RXMBP_MULTIEN_MASK BIT(5)
149#define EMAC_RXMBP_MULTICH_SHIFT (0)
150#define EMAC_RXMBP_MULTICH_MASK (0x7)
151#define EMAC_RXMBP_CHMASK (0x7)
152
153/* EMAC register definitions/bit maps used */
154# define EMAC_MBP_RXPROMISC (0x00200000)
155# define EMAC_MBP_PROMISCCH(ch) (((ch) & 0x7) << 16)
156# define EMAC_MBP_RXBCAST (0x00002000)
157# define EMAC_MBP_BCASTCHAN(ch) (((ch) & 0x7) << 8)
158# define EMAC_MBP_RXMCAST (0x00000020)
159# define EMAC_MBP_MCASTCHAN(ch) ((ch) & 0x7)
160
161/* EMAC mac_control register */
162#define EMAC_MACCONTROL_TXPTYPE BIT(9)
163#define EMAC_MACCONTROL_TXPACEEN BIT(6)
164#define EMAC_MACCONTROL_GMIIEN BIT(5)
165#define EMAC_MACCONTROL_GIGABITEN BIT(7)
166#define EMAC_MACCONTROL_FULLDUPLEXEN BIT(0)
167#define EMAC_MACCONTROL_RMIISPEED_MASK BIT(15)
168
169/* GIGABIT MODE related bits */
170#define EMAC_DM646X_MACCONTORL_GIG BIT(7)
171#define EMAC_DM646X_MACCONTORL_GIGFORCE BIT(17)
172
173/* EMAC mac_status register */
174#define EMAC_MACSTATUS_TXERRCODE_MASK (0xF00000)
175#define EMAC_MACSTATUS_TXERRCODE_SHIFT (20)
176#define EMAC_MACSTATUS_TXERRCH_MASK (0x7)
177#define EMAC_MACSTATUS_TXERRCH_SHIFT (16)
178#define EMAC_MACSTATUS_RXERRCODE_MASK (0xF000)
179#define EMAC_MACSTATUS_RXERRCODE_SHIFT (12)
180#define EMAC_MACSTATUS_RXERRCH_MASK (0x7)
181#define EMAC_MACSTATUS_RXERRCH_SHIFT (8)
182
183/* EMAC RX register masks */
184#define EMAC_RX_MAX_LEN_MASK (0xFFFF)
185#define EMAC_RX_BUFFER_OFFSET_MASK (0xFFFF)
186
187/* MAC_IN_VECTOR (0x180) register bit fields */
188#define EMAC_DM644X_MAC_IN_VECTOR_HOST_INT BIT(17)
189#define EMAC_DM644X_MAC_IN_VECTOR_STATPEND_INT BIT(16)
190#define EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC BIT(8)
191#define EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC BIT(0)
192
193/** NOTE:: For DM646x the IN_VECTOR has changed */
194#define EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC BIT(EMAC_DEF_RX_CH)
195#define EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC BIT(16 + EMAC_DEF_TX_CH)
196#define EMAC_DM646X_MAC_IN_VECTOR_HOST_INT BIT(26)
197#define EMAC_DM646X_MAC_IN_VECTOR_STATPEND_INT BIT(27)
198
199/* CPPI bit positions */
200#define EMAC_CPPI_SOP_BIT BIT(31)
201#define EMAC_CPPI_EOP_BIT BIT(30)
202#define EMAC_CPPI_OWNERSHIP_BIT BIT(29)
203#define EMAC_CPPI_EOQ_BIT BIT(28)
204#define EMAC_CPPI_TEARDOWN_COMPLETE_BIT BIT(27)
205#define EMAC_CPPI_PASS_CRC_BIT BIT(26)
206#define EMAC_RX_BD_BUF_SIZE (0xFFFF)
207#define EMAC_BD_LENGTH_FOR_CACHE (16) /* only CPPI bytes */
208#define EMAC_RX_BD_PKT_LENGTH_MASK (0xFFFF)
209
210/* Max hardware defines */
211#define EMAC_MAX_TXRX_CHANNELS (8) /* Max hardware channels */
212#define EMAC_DEF_MAX_MULTICAST_ADDRESSES (64) /* Max mcast addr's */
213
214/* EMAC Peripheral Device Register Memory Layout structure */
215#define EMAC_MACINVECTOR 0x90
216
217#define EMAC_DM646X_MACEOIVECTOR 0x94
218
219#define EMAC_MACINTSTATRAW 0xB0
220#define EMAC_MACINTSTATMASKED 0xB4
221#define EMAC_MACINTMASKSET 0xB8
222#define EMAC_MACINTMASKCLEAR 0xBC
223
224#define EMAC_RXMBPENABLE 0x100
225#define EMAC_RXUNICASTSET 0x104
226#define EMAC_RXUNICASTCLEAR 0x108
227#define EMAC_RXMAXLEN 0x10C
228#define EMAC_RXBUFFEROFFSET 0x110
229#define EMAC_RXFILTERLOWTHRESH 0x114
230
231#define EMAC_MACCONTROL 0x160
232#define EMAC_MACSTATUS 0x164
233#define EMAC_EMCONTROL 0x168
234#define EMAC_FIFOCONTROL 0x16C
235#define EMAC_MACCONFIG 0x170
236#define EMAC_SOFTRESET 0x174
237#define EMAC_MACSRCADDRLO 0x1D0
238#define EMAC_MACSRCADDRHI 0x1D4
239#define EMAC_MACHASH1 0x1D8
240#define EMAC_MACHASH2 0x1DC
241#define EMAC_MACADDRLO 0x500
242#define EMAC_MACADDRHI 0x504
243#define EMAC_MACINDEX 0x508
244
245/* EMAC statistics registers */
246#define EMAC_RXGOODFRAMES 0x200
247#define EMAC_RXBCASTFRAMES 0x204
248#define EMAC_RXMCASTFRAMES 0x208
249#define EMAC_RXPAUSEFRAMES 0x20C
250#define EMAC_RXCRCERRORS 0x210
251#define EMAC_RXALIGNCODEERRORS 0x214
252#define EMAC_RXOVERSIZED 0x218
253#define EMAC_RXJABBER 0x21C
254#define EMAC_RXUNDERSIZED 0x220
255#define EMAC_RXFRAGMENTS 0x224
256#define EMAC_RXFILTERED 0x228
257#define EMAC_RXQOSFILTERED 0x22C
258#define EMAC_RXOCTETS 0x230
259#define EMAC_TXGOODFRAMES 0x234
260#define EMAC_TXBCASTFRAMES 0x238
261#define EMAC_TXMCASTFRAMES 0x23C
262#define EMAC_TXPAUSEFRAMES 0x240
263#define EMAC_TXDEFERRED 0x244
264#define EMAC_TXCOLLISION 0x248
265#define EMAC_TXSINGLECOLL 0x24C
266#define EMAC_TXMULTICOLL 0x250
267#define EMAC_TXEXCESSIVECOLL 0x254
268#define EMAC_TXLATECOLL 0x258
269#define EMAC_TXUNDERRUN 0x25C
270#define EMAC_TXCARRIERSENSE 0x260
271#define EMAC_TXOCTETS 0x264
272#define EMAC_NETOCTETS 0x280
273#define EMAC_RXSOFOVERRUNS 0x284
274#define EMAC_RXMOFOVERRUNS 0x288
275#define EMAC_RXDMAOVERRUNS 0x28C
276
277/* EMAC DM644x control registers */
278#define EMAC_CTRL_EWCTL (0x4)
279#define EMAC_CTRL_EWINTTCNT (0x8)
280
281/* EMAC DM644x control module masks */
282#define EMAC_DM644X_EWINTCNT_MASK 0x1FFFF
283#define EMAC_DM644X_INTMIN_INTVL 0x1
284#define EMAC_DM644X_INTMAX_INTVL (EMAC_DM644X_EWINTCNT_MASK)
285
286/* EMAC DM646X control module registers */
287#define EMAC_DM646X_CMINTCTRL 0x0C
288#define EMAC_DM646X_CMRXINTEN 0x14
289#define EMAC_DM646X_CMTXINTEN 0x18
290#define EMAC_DM646X_CMRXINTMAX 0x70
291#define EMAC_DM646X_CMTXINTMAX 0x74
292
293/* EMAC DM646X control module masks */
294#define EMAC_DM646X_INTPACEEN (0x3 << 16)
295#define EMAC_DM646X_INTPRESCALE_MASK (0x7FF << 0)
296#define EMAC_DM646X_CMINTMAX_CNT 63
297#define EMAC_DM646X_CMINTMIN_CNT 2
298#define EMAC_DM646X_CMINTMAX_INTVL (1000 / EMAC_DM646X_CMINTMIN_CNT)
299#define EMAC_DM646X_CMINTMIN_INTVL ((1000 / EMAC_DM646X_CMINTMAX_CNT) + 1)
300
301
302/* EMAC EOI codes for C0 */
303#define EMAC_DM646X_MAC_EOI_C0_RXEN (0x01)
304#define EMAC_DM646X_MAC_EOI_C0_TXEN (0x02)
305
306/* EMAC Stats Clear Mask */
307#define EMAC_STATS_CLR_MASK (0xFFFFFFFF)
308
309/* emac_priv: EMAC private data structure
310 *
311 * EMAC adapter private data structure
312 */
313struct emac_priv {
314 u32 msg_enable;
315 struct net_device *ndev;
316 struct platform_device *pdev;
317 struct napi_struct napi;
318 char mac_addr[6];
319 void __iomem *remap_addr;
320 u32 emac_base_phys;
321 void __iomem *emac_base;
322 void __iomem *ctrl_base;
323 struct cpdma_ctlr *dma;
324 struct cpdma_chan *txchan;
325 struct cpdma_chan *rxchan;
326 u32 link; /* 1=link on, 0=link off */
327 u32 speed; /* 0=Auto Neg, 1=No PHY, 10,100, 1000 - mbps */
328 u32 duplex; /* Link duplex: 0=Half, 1=Full */
329 u32 rx_buf_size;
330 u32 isr_count;
331 u32 coal_intvl;
332 u32 bus_freq_mhz;
333 u8 rmii_en;
334 u8 version;
335 u32 mac_hash1;
336 u32 mac_hash2;
337 u32 multicast_hash_cnt[EMAC_NUM_MULTICAST_BITS];
338 u32 rx_addr_type;
339 const char *phy_id;
340 struct phy_device *phydev;
341 spinlock_t lock;
342 /*platform specific members*/
343 void (*int_enable) (void);
344 void (*int_disable) (void);
345};
346
347/* clock frequency for EMAC */
348static struct clk *emac_clk;
349static unsigned long emac_bus_frequency;
350
351/* EMAC TX Host Error description strings */
352static char *emac_txhost_errcodes[16] = {
353 "No error", "SOP error", "Ownership bit not set in SOP buffer",
354 "Zero Next Buffer Descriptor Pointer Without EOP",
355 "Zero Buffer Pointer", "Zero Buffer Length", "Packet Length Error",
356 "Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
357 "Reserved", "Reserved", "Reserved", "Reserved"
358};
359
360/* EMAC RX Host Error description strings */
361static char *emac_rxhost_errcodes[16] = {
362 "No error", "Reserved", "Ownership bit not set in input buffer",
363 "Reserved", "Zero Buffer Pointer", "Reserved", "Reserved",
364 "Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
365 "Reserved", "Reserved", "Reserved", "Reserved"
366};
367
368/* Helper macros */
369#define emac_read(reg) ioread32(priv->emac_base + (reg))
370#define emac_write(reg, val) iowrite32(val, priv->emac_base + (reg))
371
372#define emac_ctrl_read(reg) ioread32((priv->ctrl_base + (reg)))
373#define emac_ctrl_write(reg, val) iowrite32(val, (priv->ctrl_base + (reg)))
374
375/**
376 * emac_dump_regs: Dump important EMAC registers to debug terminal
377 * @priv: The DaVinci EMAC private adapter structure
378 *
379 * Executes ethtool set cmd & sets phy mode
380 *
381 */
382static void emac_dump_regs(struct emac_priv *priv)
383{
384 struct device *emac_dev = &priv->ndev->dev;
385
386 /* Print important registers in EMAC */
387 dev_info(emac_dev, "EMAC Basic registers\n");
388 if (priv->version == EMAC_VERSION_1) {
389 dev_info(emac_dev, "EMAC: EWCTL: %08X, EWINTTCNT: %08X\n",
390 emac_ctrl_read(EMAC_CTRL_EWCTL),
391 emac_ctrl_read(EMAC_CTRL_EWINTTCNT));
392 }
393 dev_info(emac_dev, "EMAC: EmuControl:%08X, FifoControl: %08X\n",
394 emac_read(EMAC_EMCONTROL), emac_read(EMAC_FIFOCONTROL));
395 dev_info(emac_dev, "EMAC: MBPEnable:%08X, RXUnicastSet: %08X, "\
396 "RXMaxLen=%08X\n", emac_read(EMAC_RXMBPENABLE),
397 emac_read(EMAC_RXUNICASTSET), emac_read(EMAC_RXMAXLEN));
398 dev_info(emac_dev, "EMAC: MacControl:%08X, MacStatus: %08X, "\
399 "MacConfig=%08X\n", emac_read(EMAC_MACCONTROL),
400 emac_read(EMAC_MACSTATUS), emac_read(EMAC_MACCONFIG));
401 dev_info(emac_dev, "EMAC Statistics\n");
402 dev_info(emac_dev, "EMAC: rx_good_frames:%d\n",
403 emac_read(EMAC_RXGOODFRAMES));
404 dev_info(emac_dev, "EMAC: rx_broadcast_frames:%d\n",
405 emac_read(EMAC_RXBCASTFRAMES));
406 dev_info(emac_dev, "EMAC: rx_multicast_frames:%d\n",
407 emac_read(EMAC_RXMCASTFRAMES));
408 dev_info(emac_dev, "EMAC: rx_pause_frames:%d\n",
409 emac_read(EMAC_RXPAUSEFRAMES));
410 dev_info(emac_dev, "EMAC: rx_crcerrors:%d\n",
411 emac_read(EMAC_RXCRCERRORS));
412 dev_info(emac_dev, "EMAC: rx_align_code_errors:%d\n",
413 emac_read(EMAC_RXALIGNCODEERRORS));
414 dev_info(emac_dev, "EMAC: rx_oversized_frames:%d\n",
415 emac_read(EMAC_RXOVERSIZED));
416 dev_info(emac_dev, "EMAC: rx_jabber_frames:%d\n",
417 emac_read(EMAC_RXJABBER));
418 dev_info(emac_dev, "EMAC: rx_undersized_frames:%d\n",
419 emac_read(EMAC_RXUNDERSIZED));
420 dev_info(emac_dev, "EMAC: rx_fragments:%d\n",
421 emac_read(EMAC_RXFRAGMENTS));
422 dev_info(emac_dev, "EMAC: rx_filtered_frames:%d\n",
423 emac_read(EMAC_RXFILTERED));
424 dev_info(emac_dev, "EMAC: rx_qos_filtered_frames:%d\n",
425 emac_read(EMAC_RXQOSFILTERED));
426 dev_info(emac_dev, "EMAC: rx_octets:%d\n",
427 emac_read(EMAC_RXOCTETS));
428 dev_info(emac_dev, "EMAC: tx_goodframes:%d\n",
429 emac_read(EMAC_TXGOODFRAMES));
430 dev_info(emac_dev, "EMAC: tx_bcastframes:%d\n",
431 emac_read(EMAC_TXBCASTFRAMES));
432 dev_info(emac_dev, "EMAC: tx_mcastframes:%d\n",
433 emac_read(EMAC_TXMCASTFRAMES));
434 dev_info(emac_dev, "EMAC: tx_pause_frames:%d\n",
435 emac_read(EMAC_TXPAUSEFRAMES));
436 dev_info(emac_dev, "EMAC: tx_deferred_frames:%d\n",
437 emac_read(EMAC_TXDEFERRED));
438 dev_info(emac_dev, "EMAC: tx_collision_frames:%d\n",
439 emac_read(EMAC_TXCOLLISION));
440 dev_info(emac_dev, "EMAC: tx_single_coll_frames:%d\n",
441 emac_read(EMAC_TXSINGLECOLL));
442 dev_info(emac_dev, "EMAC: tx_mult_coll_frames:%d\n",
443 emac_read(EMAC_TXMULTICOLL));
444 dev_info(emac_dev, "EMAC: tx_excessive_collisions:%d\n",
445 emac_read(EMAC_TXEXCESSIVECOLL));
446 dev_info(emac_dev, "EMAC: tx_late_collisions:%d\n",
447 emac_read(EMAC_TXLATECOLL));
448 dev_info(emac_dev, "EMAC: tx_underrun:%d\n",
449 emac_read(EMAC_TXUNDERRUN));
450 dev_info(emac_dev, "EMAC: tx_carrier_sense_errors:%d\n",
451 emac_read(EMAC_TXCARRIERSENSE));
452 dev_info(emac_dev, "EMAC: tx_octets:%d\n",
453 emac_read(EMAC_TXOCTETS));
454 dev_info(emac_dev, "EMAC: net_octets:%d\n",
455 emac_read(EMAC_NETOCTETS));
456 dev_info(emac_dev, "EMAC: rx_sof_overruns:%d\n",
457 emac_read(EMAC_RXSOFOVERRUNS));
458 dev_info(emac_dev, "EMAC: rx_mof_overruns:%d\n",
459 emac_read(EMAC_RXMOFOVERRUNS));
460 dev_info(emac_dev, "EMAC: rx_dma_overruns:%d\n",
461 emac_read(EMAC_RXDMAOVERRUNS));
462
463 cpdma_ctlr_dump(priv->dma);
464}
465
466/**
467 * emac_get_drvinfo: Get EMAC driver information
468 * @ndev: The DaVinci EMAC network adapter
469 * @info: ethtool info structure containing name and version
470 *
471 * Returns EMAC driver information (name and version)
472 *
473 */
474static void emac_get_drvinfo(struct net_device *ndev,
475 struct ethtool_drvinfo *info)
476{
477 strcpy(info->driver, emac_version_string);
478 strcpy(info->version, EMAC_MODULE_VERSION);
479}
480
481/**
482 * emac_get_settings: Get EMAC settings
483 * @ndev: The DaVinci EMAC network adapter
484 * @ecmd: ethtool command
485 *
486 * Executes ethool get command
487 *
488 */
489static int emac_get_settings(struct net_device *ndev,
490 struct ethtool_cmd *ecmd)
491{
492 struct emac_priv *priv = netdev_priv(ndev);
493 if (priv->phydev)
494 return phy_ethtool_gset(priv->phydev, ecmd);
495 else
496 return -EOPNOTSUPP;
497
498}
499
500/**
501 * emac_set_settings: Set EMAC settings
502 * @ndev: The DaVinci EMAC network adapter
503 * @ecmd: ethtool command
504 *
505 * Executes ethool set command
506 *
507 */
508static int emac_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
509{
510 struct emac_priv *priv = netdev_priv(ndev);
511 if (priv->phydev)
512 return phy_ethtool_sset(priv->phydev, ecmd);
513 else
514 return -EOPNOTSUPP;
515
516}
517
518/**
519 * emac_get_coalesce : Get interrupt coalesce settings for this device
520 * @ndev : The DaVinci EMAC network adapter
521 * @coal : ethtool coalesce settings structure
522 *
523 * Fetch the current interrupt coalesce settings
524 *
525 */
526static int emac_get_coalesce(struct net_device *ndev,
527 struct ethtool_coalesce *coal)
528{
529 struct emac_priv *priv = netdev_priv(ndev);
530
531 coal->rx_coalesce_usecs = priv->coal_intvl;
532 return 0;
533
534}
535
536/**
537 * emac_set_coalesce : Set interrupt coalesce settings for this device
538 * @ndev : The DaVinci EMAC network adapter
539 * @coal : ethtool coalesce settings structure
540 *
541 * Set interrupt coalesce parameters
542 *
543 */
544static int emac_set_coalesce(struct net_device *ndev,
545 struct ethtool_coalesce *coal)
546{
547 struct emac_priv *priv = netdev_priv(ndev);
548 u32 int_ctrl, num_interrupts = 0;
549 u32 prescale = 0, addnl_dvdr = 1, coal_intvl = 0;
550
551 if (!coal->rx_coalesce_usecs)
552 return -EINVAL;
553
554 coal_intvl = coal->rx_coalesce_usecs;
555
556 switch (priv->version) {
557 case EMAC_VERSION_2:
558 int_ctrl = emac_ctrl_read(EMAC_DM646X_CMINTCTRL);
559 prescale = priv->bus_freq_mhz * 4;
560
561 if (coal_intvl < EMAC_DM646X_CMINTMIN_INTVL)
562 coal_intvl = EMAC_DM646X_CMINTMIN_INTVL;
563
564 if (coal_intvl > EMAC_DM646X_CMINTMAX_INTVL) {
565 /*
566 * Interrupt pacer works with 4us Pulse, we can
567 * throttle further by dilating the 4us pulse.
568 */
569 addnl_dvdr = EMAC_DM646X_INTPRESCALE_MASK / prescale;
570
571 if (addnl_dvdr > 1) {
572 prescale *= addnl_dvdr;
573 if (coal_intvl > (EMAC_DM646X_CMINTMAX_INTVL
574 * addnl_dvdr))
575 coal_intvl = (EMAC_DM646X_CMINTMAX_INTVL
576 * addnl_dvdr);
577 } else {
578 addnl_dvdr = 1;
579 coal_intvl = EMAC_DM646X_CMINTMAX_INTVL;
580 }
581 }
582
583 num_interrupts = (1000 * addnl_dvdr) / coal_intvl;
584
585 int_ctrl |= EMAC_DM646X_INTPACEEN;
586 int_ctrl &= (~EMAC_DM646X_INTPRESCALE_MASK);
587 int_ctrl |= (prescale & EMAC_DM646X_INTPRESCALE_MASK);
588 emac_ctrl_write(EMAC_DM646X_CMINTCTRL, int_ctrl);
589
590 emac_ctrl_write(EMAC_DM646X_CMRXINTMAX, num_interrupts);
591 emac_ctrl_write(EMAC_DM646X_CMTXINTMAX, num_interrupts);
592
593 break;
594 default:
595 int_ctrl = emac_ctrl_read(EMAC_CTRL_EWINTTCNT);
596 int_ctrl &= (~EMAC_DM644X_EWINTCNT_MASK);
597 prescale = coal_intvl * priv->bus_freq_mhz;
598 if (prescale > EMAC_DM644X_EWINTCNT_MASK) {
599 prescale = EMAC_DM644X_EWINTCNT_MASK;
600 coal_intvl = prescale / priv->bus_freq_mhz;
601 }
602 emac_ctrl_write(EMAC_CTRL_EWINTTCNT, (int_ctrl | prescale));
603
604 break;
605 }
606
607 printk(KERN_INFO"Set coalesce to %d usecs.\n", coal_intvl);
608 priv->coal_intvl = coal_intvl;
609
610 return 0;
611
612}
613
614
615/**
616 * ethtool_ops: DaVinci EMAC Ethtool structure
617 *
618 * Ethtool support for EMAC adapter
619 *
620 */
621static const struct ethtool_ops ethtool_ops = {
622 .get_drvinfo = emac_get_drvinfo,
623 .get_settings = emac_get_settings,
624 .set_settings = emac_set_settings,
625 .get_link = ethtool_op_get_link,
626 .get_coalesce = emac_get_coalesce,
627 .set_coalesce = emac_set_coalesce,
628};
629
630/**
631 * emac_update_phystatus: Update Phy status
632 * @priv: The DaVinci EMAC private adapter structure
633 *
634 * Updates phy status and takes action for network queue if required
635 * based upon link status
636 *
637 */
638static void emac_update_phystatus(struct emac_priv *priv)
639{
640 u32 mac_control;
641 u32 new_duplex;
642 u32 cur_duplex;
643 struct net_device *ndev = priv->ndev;
644
645 mac_control = emac_read(EMAC_MACCONTROL);
646 cur_duplex = (mac_control & EMAC_MACCONTROL_FULLDUPLEXEN) ?
647 DUPLEX_FULL : DUPLEX_HALF;
648 if (priv->phydev)
649 new_duplex = priv->phydev->duplex;
650 else
651 new_duplex = DUPLEX_FULL;
652
653 /* We get called only if link has changed (speed/duplex/status) */
654 if ((priv->link) && (new_duplex != cur_duplex)) {
655 priv->duplex = new_duplex;
656 if (DUPLEX_FULL == priv->duplex)
657 mac_control |= (EMAC_MACCONTROL_FULLDUPLEXEN);
658 else
659 mac_control &= ~(EMAC_MACCONTROL_FULLDUPLEXEN);
660 }
661
662 if (priv->speed == SPEED_1000 && (priv->version == EMAC_VERSION_2)) {
663 mac_control = emac_read(EMAC_MACCONTROL);
664 mac_control |= (EMAC_DM646X_MACCONTORL_GIG |
665 EMAC_DM646X_MACCONTORL_GIGFORCE);
666 } else {
667 /* Clear the GIG bit and GIGFORCE bit */
668 mac_control &= ~(EMAC_DM646X_MACCONTORL_GIGFORCE |
669 EMAC_DM646X_MACCONTORL_GIG);
670
671 if (priv->rmii_en && (priv->speed == SPEED_100))
672 mac_control |= EMAC_MACCONTROL_RMIISPEED_MASK;
673 else
674 mac_control &= ~EMAC_MACCONTROL_RMIISPEED_MASK;
675 }
676
677 /* Update mac_control if changed */
678 emac_write(EMAC_MACCONTROL, mac_control);
679
680 if (priv->link) {
681 /* link ON */
682 if (!netif_carrier_ok(ndev))
683 netif_carrier_on(ndev);
684 /* reactivate the transmit queue if it is stopped */
685 if (netif_running(ndev) && netif_queue_stopped(ndev))
686 netif_wake_queue(ndev);
687 } else {
688 /* link OFF */
689 if (netif_carrier_ok(ndev))
690 netif_carrier_off(ndev);
691 if (!netif_queue_stopped(ndev))
692 netif_stop_queue(ndev);
693 }
694}
695
696/**
697 * hash_get: Calculate hash value from mac address
698 * @addr: mac address to delete from hash table
699 *
700 * Calculates hash value from mac address
701 *
702 */
703static u32 hash_get(u8 *addr)
704{
705 u32 hash;
706 u8 tmpval;
707 int cnt;
708 hash = 0;
709
710 for (cnt = 0; cnt < 2; cnt++) {
711 tmpval = *addr++;
712 hash ^= (tmpval >> 2) ^ (tmpval << 4);
713 tmpval = *addr++;
714 hash ^= (tmpval >> 4) ^ (tmpval << 2);
715 tmpval = *addr++;
716 hash ^= (tmpval >> 6) ^ (tmpval);
717 }
718
719 return hash & 0x3F;
720}
721
722/**
723 * hash_add: Hash function to add mac addr from hash table
724 * @priv: The DaVinci EMAC private adapter structure
725 * mac_addr: mac address to delete from hash table
726 *
727 * Adds mac address to the internal hash table
728 *
729 */
730static int hash_add(struct emac_priv *priv, u8 *mac_addr)
731{
732 struct device *emac_dev = &priv->ndev->dev;
733 u32 rc = 0;
734 u32 hash_bit;
735 u32 hash_value = hash_get(mac_addr);
736
737 if (hash_value >= EMAC_NUM_MULTICAST_BITS) {
738 if (netif_msg_drv(priv)) {
739 dev_err(emac_dev, "DaVinci EMAC: hash_add(): Invalid "\
740 "Hash %08x, should not be greater than %08x",
741 hash_value, (EMAC_NUM_MULTICAST_BITS - 1));
742 }
743 return -1;
744 }
745
746 /* set the hash bit only if not previously set */
747 if (priv->multicast_hash_cnt[hash_value] == 0) {
748 rc = 1; /* hash value changed */
749 if (hash_value < 32) {
750 hash_bit = BIT(hash_value);
751 priv->mac_hash1 |= hash_bit;
752 } else {
753 hash_bit = BIT((hash_value - 32));
754 priv->mac_hash2 |= hash_bit;
755 }
756 }
757
758 /* incr counter for num of mcast addr's mapped to "this" hash bit */
759 ++priv->multicast_hash_cnt[hash_value];
760
761 return rc;
762}
763
764/**
765 * hash_del: Hash function to delete mac addr from hash table
766 * @priv: The DaVinci EMAC private adapter structure
767 * mac_addr: mac address to delete from hash table
768 *
769 * Removes mac address from the internal hash table
770 *
771 */
772static int hash_del(struct emac_priv *priv, u8 *mac_addr)
773{
774 u32 hash_value;
775 u32 hash_bit;
776
777 hash_value = hash_get(mac_addr);
778 if (priv->multicast_hash_cnt[hash_value] > 0) {
779 /* dec cntr for num of mcast addr's mapped to this hash bit */
780 --priv->multicast_hash_cnt[hash_value];
781 }
782
783 /* if counter still > 0, at least one multicast address refers
784 * to this hash bit. so return 0 */
785 if (priv->multicast_hash_cnt[hash_value] > 0)
786 return 0;
787
788 if (hash_value < 32) {
789 hash_bit = BIT(hash_value);
790 priv->mac_hash1 &= ~hash_bit;
791 } else {
792 hash_bit = BIT((hash_value - 32));
793 priv->mac_hash2 &= ~hash_bit;
794 }
795
796 /* return 1 to indicate change in mac_hash registers reqd */
797 return 1;
798}
799
800/* EMAC multicast operation */
801#define EMAC_MULTICAST_ADD 0
802#define EMAC_MULTICAST_DEL 1
803#define EMAC_ALL_MULTI_SET 2
804#define EMAC_ALL_MULTI_CLR 3
805
806/**
807 * emac_add_mcast: Set multicast address in the EMAC adapter (Internal)
808 * @priv: The DaVinci EMAC private adapter structure
809 * @action: multicast operation to perform
810 * mac_addr: mac address to set
811 *
812 * Set multicast addresses in EMAC adapter - internal function
813 *
814 */
815static void emac_add_mcast(struct emac_priv *priv, u32 action, u8 *mac_addr)
816{
817 struct device *emac_dev = &priv->ndev->dev;
818 int update = -1;
819
820 switch (action) {
821 case EMAC_MULTICAST_ADD:
822 update = hash_add(priv, mac_addr);
823 break;
824 case EMAC_MULTICAST_DEL:
825 update = hash_del(priv, mac_addr);
826 break;
827 case EMAC_ALL_MULTI_SET:
828 update = 1;
829 priv->mac_hash1 = EMAC_ALL_MULTI_REG_VALUE;
830 priv->mac_hash2 = EMAC_ALL_MULTI_REG_VALUE;
831 break;
832 case EMAC_ALL_MULTI_CLR:
833 update = 1;
834 priv->mac_hash1 = 0;
835 priv->mac_hash2 = 0;
836 memset(&(priv->multicast_hash_cnt[0]), 0,
837 sizeof(priv->multicast_hash_cnt[0]) *
838 EMAC_NUM_MULTICAST_BITS);
839 break;
840 default:
841 if (netif_msg_drv(priv))
842 dev_err(emac_dev, "DaVinci EMAC: add_mcast"\
843 ": bad operation %d", action);
844 break;
845 }
846
847 /* write to the hardware only if the register status chances */
848 if (update > 0) {
849 emac_write(EMAC_MACHASH1, priv->mac_hash1);
850 emac_write(EMAC_MACHASH2, priv->mac_hash2);
851 }
852}
853
854/**
855 * emac_dev_mcast_set: Set multicast address in the EMAC adapter
856 * @ndev: The DaVinci EMAC network adapter
857 *
858 * Set multicast addresses in EMAC adapter
859 *
860 */
861static void emac_dev_mcast_set(struct net_device *ndev)
862{
863 u32 mbp_enable;
864 struct emac_priv *priv = netdev_priv(ndev);
865
866 mbp_enable = emac_read(EMAC_RXMBPENABLE);
867 if (ndev->flags & IFF_PROMISC) {
868 mbp_enable &= (~EMAC_MBP_PROMISCCH(EMAC_DEF_PROM_CH));
869 mbp_enable |= (EMAC_MBP_RXPROMISC);
870 } else {
871 mbp_enable = (mbp_enable & ~EMAC_MBP_RXPROMISC);
872 if ((ndev->flags & IFF_ALLMULTI) ||
873 netdev_mc_count(ndev) > EMAC_DEF_MAX_MULTICAST_ADDRESSES) {
874 mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
875 emac_add_mcast(priv, EMAC_ALL_MULTI_SET, NULL);
876 }
877 if (!netdev_mc_empty(ndev)) {
878 struct netdev_hw_addr *ha;
879
880 mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
881 emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
882 /* program multicast address list into EMAC hardware */
883 netdev_for_each_mc_addr(ha, ndev) {
884 emac_add_mcast(priv, EMAC_MULTICAST_ADD,
885 (u8 *) ha->addr);
886 }
887 } else {
888 mbp_enable = (mbp_enable & ~EMAC_MBP_RXMCAST);
889 emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
890 }
891 }
892 /* Set mbp config register */
893 emac_write(EMAC_RXMBPENABLE, mbp_enable);
894}
895
896/*************************************************************************
897 * EMAC Hardware manipulation
898 *************************************************************************/
899
900/**
901 * emac_int_disable: Disable EMAC module interrupt (from adapter)
902 * @priv: The DaVinci EMAC private adapter structure
903 *
904 * Disable EMAC interrupt on the adapter
905 *
906 */
907static void emac_int_disable(struct emac_priv *priv)
908{
909 if (priv->version == EMAC_VERSION_2) {
910 unsigned long flags;
911
912 local_irq_save(flags);
913
914 /* Program C0_Int_En to zero to turn off
915 * interrupts to the CPU */
916 emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0x0);
917 emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0x0);
918 /* NOTE: Rx Threshold and Misc interrupts are not disabled */
919 if (priv->int_disable)
920 priv->int_disable();
921
922 local_irq_restore(flags);
923
924 } else {
925 /* Set DM644x control registers for interrupt control */
926 emac_ctrl_write(EMAC_CTRL_EWCTL, 0x0);
927 }
928}
929
930/**
931 * emac_int_enable: Enable EMAC module interrupt (from adapter)
932 * @priv: The DaVinci EMAC private adapter structure
933 *
934 * Enable EMAC interrupt on the adapter
935 *
936 */
937static void emac_int_enable(struct emac_priv *priv)
938{
939 if (priv->version == EMAC_VERSION_2) {
940 if (priv->int_enable)
941 priv->int_enable();
942
943 emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0xff);
944 emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0xff);
945
946 /* In addition to turning on interrupt Enable, we need
947 * ack by writing appropriate values to the EOI
948 * register */
949
950 /* NOTE: Rx Threshold and Misc interrupts are not enabled */
951
952 /* ack rxen only then a new pulse will be generated */
953 emac_write(EMAC_DM646X_MACEOIVECTOR,
954 EMAC_DM646X_MAC_EOI_C0_RXEN);
955
956 /* ack txen- only then a new pulse will be generated */
957 emac_write(EMAC_DM646X_MACEOIVECTOR,
958 EMAC_DM646X_MAC_EOI_C0_TXEN);
959
960 } else {
961 /* Set DM644x control registers for interrupt control */
962 emac_ctrl_write(EMAC_CTRL_EWCTL, 0x1);
963 }
964}
965
966/**
967 * emac_irq: EMAC interrupt handler
968 * @irq: interrupt number
969 * @dev_id: EMAC network adapter data structure ptr
970 *
971 * EMAC Interrupt handler - we only schedule NAPI and not process any packets
972 * here. EVen the interrupt status is checked (TX/RX/Err) in NAPI poll function
973 *
974 * Returns interrupt handled condition
975 */
976static irqreturn_t emac_irq(int irq, void *dev_id)
977{
978 struct net_device *ndev = (struct net_device *)dev_id;
979 struct emac_priv *priv = netdev_priv(ndev);
980
981 ++priv->isr_count;
982 if (likely(netif_running(priv->ndev))) {
983 emac_int_disable(priv);
984 napi_schedule(&priv->napi);
985 } else {
986 /* we are closing down, so dont process anything */
987 }
988 return IRQ_HANDLED;
989}
990
991static struct sk_buff *emac_rx_alloc(struct emac_priv *priv)
992{
993 struct sk_buff *skb = dev_alloc_skb(priv->rx_buf_size);
994 if (WARN_ON(!skb))
995 return NULL;
996 skb->dev = priv->ndev;
997 skb_reserve(skb, NET_IP_ALIGN);
998 return skb;
999}
1000
1001static void emac_rx_handler(void *token, int len, int status)
1002{
1003 struct sk_buff *skb = token;
1004 struct net_device *ndev = skb->dev;
1005 struct emac_priv *priv = netdev_priv(ndev);
1006 struct device *emac_dev = &ndev->dev;
1007 int ret;
1008
1009 /* free and bail if we are shutting down */
1010 if (unlikely(!netif_running(ndev) || !netif_carrier_ok(ndev))) {
1011 dev_kfree_skb_any(skb);
1012 return;
1013 }
1014
1015 /* recycle on receive error */
1016 if (status < 0) {
1017 ndev->stats.rx_errors++;
1018 goto recycle;
1019 }
1020
1021 /* feed received packet up the stack */
1022 skb_put(skb, len);
1023 skb->protocol = eth_type_trans(skb, ndev);
1024 netif_receive_skb(skb);
1025 ndev->stats.rx_bytes += len;
1026 ndev->stats.rx_packets++;
1027
1028 /* alloc a new packet for receive */
1029 skb = emac_rx_alloc(priv);
1030 if (!skb) {
1031 if (netif_msg_rx_err(priv) && net_ratelimit())
1032 dev_err(emac_dev, "failed rx buffer alloc\n");
1033 return;
1034 }
1035
1036recycle:
1037 ret = cpdma_chan_submit(priv->rxchan, skb, skb->data,
1038 skb_tailroom(skb), GFP_KERNEL);
1039 if (WARN_ON(ret < 0))
1040 dev_kfree_skb_any(skb);
1041}
1042
1043static void emac_tx_handler(void *token, int len, int status)
1044{
1045 struct sk_buff *skb = token;
1046 struct net_device *ndev = skb->dev;
1047
1048 if (unlikely(netif_queue_stopped(ndev)))
1049 netif_start_queue(ndev);
1050 ndev->stats.tx_packets++;
1051 ndev->stats.tx_bytes += len;
1052 dev_kfree_skb_any(skb);
1053}
1054
1055/**
1056 * emac_dev_xmit: EMAC Transmit function
1057 * @skb: SKB pointer
1058 * @ndev: The DaVinci EMAC network adapter
1059 *
1060 * Called by the system to transmit a packet - we queue the packet in
1061 * EMAC hardware transmit queue
1062 *
1063 * Returns success(NETDEV_TX_OK) or error code (typically out of desc's)
1064 */
1065static int emac_dev_xmit(struct sk_buff *skb, struct net_device *ndev)
1066{
1067 struct device *emac_dev = &ndev->dev;
1068 int ret_code;
1069 struct emac_priv *priv = netdev_priv(ndev);
1070
1071 /* If no link, return */
1072 if (unlikely(!priv->link)) {
1073 if (netif_msg_tx_err(priv) && net_ratelimit())
1074 dev_err(emac_dev, "DaVinci EMAC: No link to transmit");
1075 goto fail_tx;
1076 }
1077
1078 ret_code = skb_padto(skb, EMAC_DEF_MIN_ETHPKTSIZE);
1079 if (unlikely(ret_code < 0)) {
1080 if (netif_msg_tx_err(priv) && net_ratelimit())
1081 dev_err(emac_dev, "DaVinci EMAC: packet pad failed");
1082 goto fail_tx;
1083 }
1084
1085 skb_tx_timestamp(skb);
1086
1087 ret_code = cpdma_chan_submit(priv->txchan, skb, skb->data, skb->len,
1088 GFP_KERNEL);
1089 if (unlikely(ret_code != 0)) {
1090 if (netif_msg_tx_err(priv) && net_ratelimit())
1091 dev_err(emac_dev, "DaVinci EMAC: desc submit failed");
1092 goto fail_tx;
1093 }
1094
1095 return NETDEV_TX_OK;
1096
1097fail_tx:
1098 ndev->stats.tx_dropped++;
1099 netif_stop_queue(ndev);
1100 return NETDEV_TX_BUSY;
1101}
1102
1103/**
1104 * emac_dev_tx_timeout: EMAC Transmit timeout function
1105 * @ndev: The DaVinci EMAC network adapter
1106 *
1107 * Called when system detects that a skb timeout period has expired
1108 * potentially due to a fault in the adapter in not being able to send
1109 * it out on the wire. We teardown the TX channel assuming a hardware
1110 * error and re-initialize the TX channel for hardware operation
1111 *
1112 */
1113static void emac_dev_tx_timeout(struct net_device *ndev)
1114{
1115 struct emac_priv *priv = netdev_priv(ndev);
1116 struct device *emac_dev = &ndev->dev;
1117
1118 if (netif_msg_tx_err(priv))
1119 dev_err(emac_dev, "DaVinci EMAC: xmit timeout, restarting TX");
1120
1121 emac_dump_regs(priv);
1122
1123 ndev->stats.tx_errors++;
1124 emac_int_disable(priv);
1125 cpdma_chan_stop(priv->txchan);
1126 cpdma_chan_start(priv->txchan);
1127 emac_int_enable(priv);
1128}
1129
1130/**
1131 * emac_set_type0addr: Set EMAC Type0 mac address
1132 * @priv: The DaVinci EMAC private adapter structure
1133 * @ch: RX channel number
1134 * @mac_addr: MAC address to set in device
1135 *
1136 * Called internally to set Type0 mac address of the adapter (Device)
1137 *
1138 * Returns success (0) or appropriate error code (none as of now)
1139 */
1140static void emac_set_type0addr(struct emac_priv *priv, u32 ch, char *mac_addr)
1141{
1142 u32 val;
1143 val = ((mac_addr[5] << 8) | (mac_addr[4]));
1144 emac_write(EMAC_MACSRCADDRLO, val);
1145
1146 val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1147 (mac_addr[1] << 8) | (mac_addr[0]));
1148 emac_write(EMAC_MACSRCADDRHI, val);
1149 val = emac_read(EMAC_RXUNICASTSET);
1150 val |= BIT(ch);
1151 emac_write(EMAC_RXUNICASTSET, val);
1152 val = emac_read(EMAC_RXUNICASTCLEAR);
1153 val &= ~BIT(ch);
1154 emac_write(EMAC_RXUNICASTCLEAR, val);
1155}
1156
1157/**
1158 * emac_set_type1addr: Set EMAC Type1 mac address
1159 * @priv: The DaVinci EMAC private adapter structure
1160 * @ch: RX channel number
1161 * @mac_addr: MAC address to set in device
1162 *
1163 * Called internally to set Type1 mac address of the adapter (Device)
1164 *
1165 * Returns success (0) or appropriate error code (none as of now)
1166 */
1167static void emac_set_type1addr(struct emac_priv *priv, u32 ch, char *mac_addr)
1168{
1169 u32 val;
1170 emac_write(EMAC_MACINDEX, ch);
1171 val = ((mac_addr[5] << 8) | mac_addr[4]);
1172 emac_write(EMAC_MACADDRLO, val);
1173 val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1174 (mac_addr[1] << 8) | (mac_addr[0]));
1175 emac_write(EMAC_MACADDRHI, val);
1176 emac_set_type0addr(priv, ch, mac_addr);
1177}
1178
1179/**
1180 * emac_set_type2addr: Set EMAC Type2 mac address
1181 * @priv: The DaVinci EMAC private adapter structure
1182 * @ch: RX channel number
1183 * @mac_addr: MAC address to set in device
1184 * @index: index into RX address entries
1185 * @match: match parameter for RX address matching logic
1186 *
1187 * Called internally to set Type2 mac address of the adapter (Device)
1188 *
1189 * Returns success (0) or appropriate error code (none as of now)
1190 */
1191static void emac_set_type2addr(struct emac_priv *priv, u32 ch,
1192 char *mac_addr, int index, int match)
1193{
1194 u32 val;
1195 emac_write(EMAC_MACINDEX, index);
1196 val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1197 (mac_addr[1] << 8) | (mac_addr[0]));
1198 emac_write(EMAC_MACADDRHI, val);
1199 val = ((mac_addr[5] << 8) | mac_addr[4] | ((ch & 0x7) << 16) | \
1200 (match << 19) | BIT(20));
1201 emac_write(EMAC_MACADDRLO, val);
1202 emac_set_type0addr(priv, ch, mac_addr);
1203}
1204
1205/**
1206 * emac_setmac: Set mac address in the adapter (internal function)
1207 * @priv: The DaVinci EMAC private adapter structure
1208 * @ch: RX channel number
1209 * @mac_addr: MAC address to set in device
1210 *
1211 * Called internally to set the mac address of the adapter (Device)
1212 *
1213 * Returns success (0) or appropriate error code (none as of now)
1214 */
1215static void emac_setmac(struct emac_priv *priv, u32 ch, char *mac_addr)
1216{
1217 struct device *emac_dev = &priv->ndev->dev;
1218
1219 if (priv->rx_addr_type == 0) {
1220 emac_set_type0addr(priv, ch, mac_addr);
1221 } else if (priv->rx_addr_type == 1) {
1222 u32 cnt;
1223 for (cnt = 0; cnt < EMAC_MAX_TXRX_CHANNELS; cnt++)
1224 emac_set_type1addr(priv, ch, mac_addr);
1225 } else if (priv->rx_addr_type == 2) {
1226 emac_set_type2addr(priv, ch, mac_addr, ch, 1);
1227 emac_set_type0addr(priv, ch, mac_addr);
1228 } else {
1229 if (netif_msg_drv(priv))
1230 dev_err(emac_dev, "DaVinci EMAC: Wrong addressing\n");
1231 }
1232}
1233
1234/**
1235 * emac_dev_setmac_addr: Set mac address in the adapter
1236 * @ndev: The DaVinci EMAC network adapter
1237 * @addr: MAC address to set in device
1238 *
1239 * Called by the system to set the mac address of the adapter (Device)
1240 *
1241 * Returns success (0) or appropriate error code (none as of now)
1242 */
1243static int emac_dev_setmac_addr(struct net_device *ndev, void *addr)
1244{
1245 struct emac_priv *priv = netdev_priv(ndev);
1246 struct device *emac_dev = &priv->ndev->dev;
1247 struct sockaddr *sa = addr;
1248
1249 if (!is_valid_ether_addr(sa->sa_data))
1250 return -EINVAL;
1251
1252 /* Store mac addr in priv and rx channel and set it in EMAC hw */
1253 memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
1254 memcpy(ndev->dev_addr, sa->sa_data, ndev->addr_len);
1255
1256 /* MAC address is configured only after the interface is enabled. */
1257 if (netif_running(ndev)) {
1258 memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
1259 emac_setmac(priv, EMAC_DEF_RX_CH, priv->mac_addr);
1260 }
1261
1262 if (netif_msg_drv(priv))
1263 dev_notice(emac_dev, "DaVinci EMAC: emac_dev_setmac_addr %pM\n",
1264 priv->mac_addr);
1265
1266 return 0;
1267}
1268
1269/**
1270 * emac_hw_enable: Enable EMAC hardware for packet transmission/reception
1271 * @priv: The DaVinci EMAC private adapter structure
1272 *
1273 * Enables EMAC hardware for packet processing - enables PHY, enables RX
1274 * for packet reception and enables device interrupts and then NAPI
1275 *
1276 * Returns success (0) or appropriate error code (none right now)
1277 */
1278static int emac_hw_enable(struct emac_priv *priv)
1279{
1280 u32 val, mbp_enable, mac_control;
1281
1282 /* Soft reset */
1283 emac_write(EMAC_SOFTRESET, 1);
1284 while (emac_read(EMAC_SOFTRESET))
1285 cpu_relax();
1286
1287 /* Disable interrupt & Set pacing for more interrupts initially */
1288 emac_int_disable(priv);
1289
1290 /* Full duplex enable bit set when auto negotiation happens */
1291 mac_control =
1292 (((EMAC_DEF_TXPRIO_FIXED) ? (EMAC_MACCONTROL_TXPTYPE) : 0x0) |
1293 ((priv->speed == 1000) ? EMAC_MACCONTROL_GIGABITEN : 0x0) |
1294 ((EMAC_DEF_TXPACING_EN) ? (EMAC_MACCONTROL_TXPACEEN) : 0x0) |
1295 ((priv->duplex == DUPLEX_FULL) ? 0x1 : 0));
1296 emac_write(EMAC_MACCONTROL, mac_control);
1297
1298 mbp_enable =
1299 (((EMAC_DEF_PASS_CRC) ? (EMAC_RXMBP_PASSCRC_MASK) : 0x0) |
1300 ((EMAC_DEF_QOS_EN) ? (EMAC_RXMBP_QOSEN_MASK) : 0x0) |
1301 ((EMAC_DEF_NO_BUFF_CHAIN) ? (EMAC_RXMBP_NOCHAIN_MASK) : 0x0) |
1302 ((EMAC_DEF_MACCTRL_FRAME_EN) ? (EMAC_RXMBP_CMFEN_MASK) : 0x0) |
1303 ((EMAC_DEF_SHORT_FRAME_EN) ? (EMAC_RXMBP_CSFEN_MASK) : 0x0) |
1304 ((EMAC_DEF_ERROR_FRAME_EN) ? (EMAC_RXMBP_CEFEN_MASK) : 0x0) |
1305 ((EMAC_DEF_PROM_EN) ? (EMAC_RXMBP_CAFEN_MASK) : 0x0) |
1306 ((EMAC_DEF_PROM_CH & EMAC_RXMBP_CHMASK) << \
1307 EMAC_RXMBP_PROMCH_SHIFT) |
1308 ((EMAC_DEF_BCAST_EN) ? (EMAC_RXMBP_BROADEN_MASK) : 0x0) |
1309 ((EMAC_DEF_BCAST_CH & EMAC_RXMBP_CHMASK) << \
1310 EMAC_RXMBP_BROADCH_SHIFT) |
1311 ((EMAC_DEF_MCAST_EN) ? (EMAC_RXMBP_MULTIEN_MASK) : 0x0) |
1312 ((EMAC_DEF_MCAST_CH & EMAC_RXMBP_CHMASK) << \
1313 EMAC_RXMBP_MULTICH_SHIFT));
1314 emac_write(EMAC_RXMBPENABLE, mbp_enable);
1315 emac_write(EMAC_RXMAXLEN, (EMAC_DEF_MAX_FRAME_SIZE &
1316 EMAC_RX_MAX_LEN_MASK));
1317 emac_write(EMAC_RXBUFFEROFFSET, (EMAC_DEF_BUFFER_OFFSET &
1318 EMAC_RX_BUFFER_OFFSET_MASK));
1319 emac_write(EMAC_RXFILTERLOWTHRESH, 0);
1320 emac_write(EMAC_RXUNICASTCLEAR, EMAC_RX_UNICAST_CLEAR_ALL);
1321 priv->rx_addr_type = (emac_read(EMAC_MACCONFIG) >> 8) & 0xFF;
1322
1323 emac_write(EMAC_MACINTMASKSET, EMAC_MAC_HOST_ERR_INTMASK_VAL);
1324
1325 emac_setmac(priv, EMAC_DEF_RX_CH, priv->mac_addr);
1326
1327 /* Enable MII */
1328 val = emac_read(EMAC_MACCONTROL);
1329 val |= (EMAC_MACCONTROL_GMIIEN);
1330 emac_write(EMAC_MACCONTROL, val);
1331
1332 /* Enable NAPI and interrupts */
1333 napi_enable(&priv->napi);
1334 emac_int_enable(priv);
1335 return 0;
1336
1337}
1338
1339/**
1340 * emac_poll: EMAC NAPI Poll function
1341 * @ndev: The DaVinci EMAC network adapter
1342 * @budget: Number of receive packets to process (as told by NAPI layer)
1343 *
1344 * NAPI Poll function implemented to process packets as per budget. We check
1345 * the type of interrupt on the device and accordingly call the TX or RX
1346 * packet processing functions. We follow the budget for RX processing and
1347 * also put a cap on number of TX pkts processed through config param. The
1348 * NAPI schedule function is called if more packets pending.
1349 *
1350 * Returns number of packets received (in most cases; else TX pkts - rarely)
1351 */
1352static int emac_poll(struct napi_struct *napi, int budget)
1353{
1354 unsigned int mask;
1355 struct emac_priv *priv = container_of(napi, struct emac_priv, napi);
1356 struct net_device *ndev = priv->ndev;
1357 struct device *emac_dev = &ndev->dev;
1358 u32 status = 0;
1359 u32 num_tx_pkts = 0, num_rx_pkts = 0;
1360
1361 /* Check interrupt vectors and call packet processing */
1362 status = emac_read(EMAC_MACINVECTOR);
1363
1364 mask = EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC;
1365
1366 if (priv->version == EMAC_VERSION_2)
1367 mask = EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC;
1368
1369 if (status & mask) {
1370 num_tx_pkts = cpdma_chan_process(priv->txchan,
1371 EMAC_DEF_TX_MAX_SERVICE);
1372 } /* TX processing */
1373
1374 mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC;
1375
1376 if (priv->version == EMAC_VERSION_2)
1377 mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC;
1378
1379 if (status & mask) {
1380 num_rx_pkts = cpdma_chan_process(priv->rxchan, budget);
1381 } /* RX processing */
1382
1383 mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
1384 if (priv->version == EMAC_VERSION_2)
1385 mask = EMAC_DM646X_MAC_IN_VECTOR_HOST_INT;
1386
1387 if (unlikely(status & mask)) {
1388 u32 ch, cause;
1389 dev_err(emac_dev, "DaVinci EMAC: Fatal Hardware Error\n");
1390 netif_stop_queue(ndev);
1391 napi_disable(&priv->napi);
1392
1393 status = emac_read(EMAC_MACSTATUS);
1394 cause = ((status & EMAC_MACSTATUS_TXERRCODE_MASK) >>
1395 EMAC_MACSTATUS_TXERRCODE_SHIFT);
1396 if (cause) {
1397 ch = ((status & EMAC_MACSTATUS_TXERRCH_MASK) >>
1398 EMAC_MACSTATUS_TXERRCH_SHIFT);
1399 if (net_ratelimit()) {
1400 dev_err(emac_dev, "TX Host error %s on ch=%d\n",
1401 &emac_txhost_errcodes[cause][0], ch);
1402 }
1403 }
1404 cause = ((status & EMAC_MACSTATUS_RXERRCODE_MASK) >>
1405 EMAC_MACSTATUS_RXERRCODE_SHIFT);
1406 if (cause) {
1407 ch = ((status & EMAC_MACSTATUS_RXERRCH_MASK) >>
1408 EMAC_MACSTATUS_RXERRCH_SHIFT);
1409 if (netif_msg_hw(priv) && net_ratelimit())
1410 dev_err(emac_dev, "RX Host error %s on ch=%d\n",
1411 &emac_rxhost_errcodes[cause][0], ch);
1412 }
1413 } else if (num_rx_pkts < budget) {
1414 napi_complete(napi);
1415 emac_int_enable(priv);
1416 }
1417
1418 return num_rx_pkts;
1419}
1420
1421#ifdef CONFIG_NET_POLL_CONTROLLER
1422/**
1423 * emac_poll_controller: EMAC Poll controller function
1424 * @ndev: The DaVinci EMAC network adapter
1425 *
1426 * Polled functionality used by netconsole and others in non interrupt mode
1427 *
1428 */
1429void emac_poll_controller(struct net_device *ndev)
1430{
1431 struct emac_priv *priv = netdev_priv(ndev);
1432
1433 emac_int_disable(priv);
1434 emac_irq(ndev->irq, ndev);
1435 emac_int_enable(priv);
1436}
1437#endif
1438
1439static void emac_adjust_link(struct net_device *ndev)
1440{
1441 struct emac_priv *priv = netdev_priv(ndev);
1442 struct phy_device *phydev = priv->phydev;
1443 unsigned long flags;
1444 int new_state = 0;
1445
1446 spin_lock_irqsave(&priv->lock, flags);
1447
1448 if (phydev->link) {
1449 /* check the mode of operation - full/half duplex */
1450 if (phydev->duplex != priv->duplex) {
1451 new_state = 1;
1452 priv->duplex = phydev->duplex;
1453 }
1454 if (phydev->speed != priv->speed) {
1455 new_state = 1;
1456 priv->speed = phydev->speed;
1457 }
1458 if (!priv->link) {
1459 new_state = 1;
1460 priv->link = 1;
1461 }
1462
1463 } else if (priv->link) {
1464 new_state = 1;
1465 priv->link = 0;
1466 priv->speed = 0;
1467 priv->duplex = ~0;
1468 }
1469 if (new_state) {
1470 emac_update_phystatus(priv);
1471 phy_print_status(priv->phydev);
1472 }
1473
1474 spin_unlock_irqrestore(&priv->lock, flags);
1475}
1476
1477/*************************************************************************
1478 * Linux Driver Model
1479 *************************************************************************/
1480
1481/**
1482 * emac_devioctl: EMAC adapter ioctl
1483 * @ndev: The DaVinci EMAC network adapter
1484 * @ifrq: request parameter
1485 * @cmd: command parameter
1486 *
1487 * EMAC driver ioctl function
1488 *
1489 * Returns success(0) or appropriate error code
1490 */
1491static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
1492{
1493 struct emac_priv *priv = netdev_priv(ndev);
1494
1495 if (!(netif_running(ndev)))
1496 return -EINVAL;
1497
1498 /* TODO: Add phy read and write and private statistics get feature */
1499
1500 return phy_mii_ioctl(priv->phydev, ifrq, cmd);
1501}
1502
1503static int match_first_device(struct device *dev, void *data)
1504{
1505 return 1;
1506}
1507
1508/**
1509 * emac_dev_open: EMAC device open
1510 * @ndev: The DaVinci EMAC network adapter
1511 *
1512 * Called when system wants to start the interface. We init TX/RX channels
1513 * and enable the hardware for packet reception/transmission and start the
1514 * network queue.
1515 *
1516 * Returns 0 for a successful open, or appropriate error code
1517 */
1518static int emac_dev_open(struct net_device *ndev)
1519{
1520 struct device *emac_dev = &ndev->dev;
1521 u32 cnt;
1522 struct resource *res;
1523 int q, m, ret;
1524 int i = 0;
1525 int k = 0;
1526 struct emac_priv *priv = netdev_priv(ndev);
1527
1528 netif_carrier_off(ndev);
1529 for (cnt = 0; cnt < ETH_ALEN; cnt++)
1530 ndev->dev_addr[cnt] = priv->mac_addr[cnt];
1531
1532 /* Configuration items */
1533 priv->rx_buf_size = EMAC_DEF_MAX_FRAME_SIZE + NET_IP_ALIGN;
1534
1535 priv->mac_hash1 = 0;
1536 priv->mac_hash2 = 0;
1537 emac_write(EMAC_MACHASH1, 0);
1538 emac_write(EMAC_MACHASH2, 0);
1539
1540 for (i = 0; i < EMAC_DEF_RX_NUM_DESC; i++) {
1541 struct sk_buff *skb = emac_rx_alloc(priv);
1542
1543 if (!skb)
1544 break;
1545
1546 ret = cpdma_chan_submit(priv->rxchan, skb, skb->data,
1547 skb_tailroom(skb), GFP_KERNEL);
1548 if (WARN_ON(ret < 0))
1549 break;
1550 }
1551
1552 /* Request IRQ */
1553
1554 while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k))) {
1555 for (i = res->start; i <= res->end; i++) {
1556 if (request_irq(i, emac_irq, IRQF_DISABLED,
1557 ndev->name, ndev))
1558 goto rollback;
1559 }
1560 k++;
1561 }
1562
1563 /* Start/Enable EMAC hardware */
1564 emac_hw_enable(priv);
1565
1566 /* Enable Interrupt pacing if configured */
1567 if (priv->coal_intvl != 0) {
1568 struct ethtool_coalesce coal;
1569
1570 coal.rx_coalesce_usecs = (priv->coal_intvl << 4);
1571 emac_set_coalesce(ndev, &coal);
1572 }
1573
1574 cpdma_ctlr_start(priv->dma);
1575
1576 priv->phydev = NULL;
1577 /* use the first phy on the bus if pdata did not give us a phy id */
1578 if (!priv->phy_id) {
1579 struct device *phy;
1580
1581 phy = bus_find_device(&mdio_bus_type, NULL, NULL,
1582 match_first_device);
1583 if (phy)
1584 priv->phy_id = dev_name(phy);
1585 }
1586
1587 if (priv->phy_id && *priv->phy_id) {
1588 priv->phydev = phy_connect(ndev, priv->phy_id,
1589 &emac_adjust_link, 0,
1590 PHY_INTERFACE_MODE_MII);
1591
1592 if (IS_ERR(priv->phydev)) {
1593 dev_err(emac_dev, "could not connect to phy %s\n",
1594 priv->phy_id);
1595 priv->phydev = NULL;
1596 return PTR_ERR(priv->phydev);
1597 }
1598
1599 priv->link = 0;
1600 priv->speed = 0;
1601 priv->duplex = ~0;
1602
1603 dev_info(emac_dev, "attached PHY driver [%s] "
1604 "(mii_bus:phy_addr=%s, id=%x)\n",
1605 priv->phydev->drv->name, dev_name(&priv->phydev->dev),
1606 priv->phydev->phy_id);
1607 } else {
1608 /* No PHY , fix the link, speed and duplex settings */
1609 dev_notice(emac_dev, "no phy, defaulting to 100/full\n");
1610 priv->link = 1;
1611 priv->speed = SPEED_100;
1612 priv->duplex = DUPLEX_FULL;
1613 emac_update_phystatus(priv);
1614 }
1615
1616 if (!netif_running(ndev)) /* debug only - to avoid compiler warning */
1617 emac_dump_regs(priv);
1618
1619 if (netif_msg_drv(priv))
1620 dev_notice(emac_dev, "DaVinci EMAC: Opened %s\n", ndev->name);
1621
1622 if (priv->phydev)
1623 phy_start(priv->phydev);
1624
1625 return 0;
1626
1627rollback:
1628
1629 dev_err(emac_dev, "DaVinci EMAC: request_irq() failed");
1630
1631 for (q = k; k >= 0; k--) {
1632 for (m = i; m >= res->start; m--)
1633 free_irq(m, ndev);
1634 res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k-1);
1635 m = res->end;
1636 }
1637 return -EBUSY;
1638}
1639
1640/**
1641 * emac_dev_stop: EMAC device stop
1642 * @ndev: The DaVinci EMAC network adapter
1643 *
1644 * Called when system wants to stop or down the interface. We stop the network
1645 * queue, disable interrupts and cleanup TX/RX channels.
1646 *
1647 * We return the statistics in net_device_stats structure pulled from emac
1648 */
1649static int emac_dev_stop(struct net_device *ndev)
1650{
1651 struct resource *res;
1652 int i = 0;
1653 int irq_num;
1654 struct emac_priv *priv = netdev_priv(ndev);
1655 struct device *emac_dev = &ndev->dev;
1656
1657 /* inform the upper layers. */
1658 netif_stop_queue(ndev);
1659 napi_disable(&priv->napi);
1660
1661 netif_carrier_off(ndev);
1662 emac_int_disable(priv);
1663 cpdma_ctlr_stop(priv->dma);
1664 emac_write(EMAC_SOFTRESET, 1);
1665
1666 if (priv->phydev)
1667 phy_disconnect(priv->phydev);
1668
1669 /* Free IRQ */
1670 while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, i))) {
1671 for (irq_num = res->start; irq_num <= res->end; irq_num++)
1672 free_irq(irq_num, priv->ndev);
1673 i++;
1674 }
1675
1676 if (netif_msg_drv(priv))
1677 dev_notice(emac_dev, "DaVinci EMAC: %s stopped\n", ndev->name);
1678
1679 return 0;
1680}
1681
1682/**
1683 * emac_dev_getnetstats: EMAC get statistics function
1684 * @ndev: The DaVinci EMAC network adapter
1685 *
1686 * Called when system wants to get statistics from the device.
1687 *
1688 * We return the statistics in net_device_stats structure pulled from emac
1689 */
1690static struct net_device_stats *emac_dev_getnetstats(struct net_device *ndev)
1691{
1692 struct emac_priv *priv = netdev_priv(ndev);
1693 u32 mac_control;
1694 u32 stats_clear_mask;
1695
1696 /* update emac hardware stats and reset the registers*/
1697
1698 mac_control = emac_read(EMAC_MACCONTROL);
1699
1700 if (mac_control & EMAC_MACCONTROL_GMIIEN)
1701 stats_clear_mask = EMAC_STATS_CLR_MASK;
1702 else
1703 stats_clear_mask = 0;
1704
1705 ndev->stats.multicast += emac_read(EMAC_RXMCASTFRAMES);
1706 emac_write(EMAC_RXMCASTFRAMES, stats_clear_mask);
1707
1708 ndev->stats.collisions += (emac_read(EMAC_TXCOLLISION) +
1709 emac_read(EMAC_TXSINGLECOLL) +
1710 emac_read(EMAC_TXMULTICOLL));
1711 emac_write(EMAC_TXCOLLISION, stats_clear_mask);
1712 emac_write(EMAC_TXSINGLECOLL, stats_clear_mask);
1713 emac_write(EMAC_TXMULTICOLL, stats_clear_mask);
1714
1715 ndev->stats.rx_length_errors += (emac_read(EMAC_RXOVERSIZED) +
1716 emac_read(EMAC_RXJABBER) +
1717 emac_read(EMAC_RXUNDERSIZED));
1718 emac_write(EMAC_RXOVERSIZED, stats_clear_mask);
1719 emac_write(EMAC_RXJABBER, stats_clear_mask);
1720 emac_write(EMAC_RXUNDERSIZED, stats_clear_mask);
1721
1722 ndev->stats.rx_over_errors += (emac_read(EMAC_RXSOFOVERRUNS) +
1723 emac_read(EMAC_RXMOFOVERRUNS));
1724 emac_write(EMAC_RXSOFOVERRUNS, stats_clear_mask);
1725 emac_write(EMAC_RXMOFOVERRUNS, stats_clear_mask);
1726
1727 ndev->stats.rx_fifo_errors += emac_read(EMAC_RXDMAOVERRUNS);
1728 emac_write(EMAC_RXDMAOVERRUNS, stats_clear_mask);
1729
1730 ndev->stats.tx_carrier_errors +=
1731 emac_read(EMAC_TXCARRIERSENSE);
1732 emac_write(EMAC_TXCARRIERSENSE, stats_clear_mask);
1733
1734 ndev->stats.tx_fifo_errors += emac_read(EMAC_TXUNDERRUN);
1735 emac_write(EMAC_TXUNDERRUN, stats_clear_mask);
1736
1737 return &ndev->stats;
1738}
1739
1740static const struct net_device_ops emac_netdev_ops = {
1741 .ndo_open = emac_dev_open,
1742 .ndo_stop = emac_dev_stop,
1743 .ndo_start_xmit = emac_dev_xmit,
1744 .ndo_set_multicast_list = emac_dev_mcast_set,
1745 .ndo_set_mac_address = emac_dev_setmac_addr,
1746 .ndo_do_ioctl = emac_devioctl,
1747 .ndo_tx_timeout = emac_dev_tx_timeout,
1748 .ndo_get_stats = emac_dev_getnetstats,
1749#ifdef CONFIG_NET_POLL_CONTROLLER
1750 .ndo_poll_controller = emac_poll_controller,
1751#endif
1752};
1753
1754/**
1755 * davinci_emac_probe: EMAC device probe
1756 * @pdev: The DaVinci EMAC device that we are removing
1757 *
1758 * Called when probing for emac devicesr. We get details of instances and
1759 * resource information from platform init and register a network device
1760 * and allocate resources necessary for driver to perform
1761 */
1762static int __devinit davinci_emac_probe(struct platform_device *pdev)
1763{
1764 int rc = 0;
1765 struct resource *res;
1766 struct net_device *ndev;
1767 struct emac_priv *priv;
1768 unsigned long size, hw_ram_addr;
1769 struct emac_platform_data *pdata;
1770 struct device *emac_dev;
1771 struct cpdma_params dma_params;
1772
1773 /* obtain emac clock from kernel */
1774 emac_clk = clk_get(&pdev->dev, NULL);
1775 if (IS_ERR(emac_clk)) {
1776 dev_err(&pdev->dev, "failed to get EMAC clock\n");
1777 return -EBUSY;
1778 }
1779 emac_bus_frequency = clk_get_rate(emac_clk);
1780 /* TODO: Probe PHY here if possible */
1781
1782 ndev = alloc_etherdev(sizeof(struct emac_priv));
1783 if (!ndev) {
1784 dev_err(&pdev->dev, "error allocating net_device\n");
1785 rc = -ENOMEM;
1786 goto free_clk;
1787 }
1788
1789 platform_set_drvdata(pdev, ndev);
1790 priv = netdev_priv(ndev);
1791 priv->pdev = pdev;
1792 priv->ndev = ndev;
1793 priv->msg_enable = netif_msg_init(debug_level, DAVINCI_EMAC_DEBUG);
1794
1795 spin_lock_init(&priv->lock);
1796
1797 pdata = pdev->dev.platform_data;
1798 if (!pdata) {
1799 dev_err(&pdev->dev, "no platform data\n");
1800 rc = -ENODEV;
1801 goto probe_quit;
1802 }
1803
1804 /* MAC addr and PHY mask , RMII enable info from platform_data */
1805 memcpy(priv->mac_addr, pdata->mac_addr, 6);
1806 priv->phy_id = pdata->phy_id;
1807 priv->rmii_en = pdata->rmii_en;
1808 priv->version = pdata->version;
1809 priv->int_enable = pdata->interrupt_enable;
1810 priv->int_disable = pdata->interrupt_disable;
1811
1812 priv->coal_intvl = 0;
1813 priv->bus_freq_mhz = (u32)(emac_bus_frequency / 1000000);
1814
1815 emac_dev = &ndev->dev;
1816 /* Get EMAC platform data */
1817 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1818 if (!res) {
1819 dev_err(&pdev->dev,"error getting res\n");
1820 rc = -ENOENT;
1821 goto probe_quit;
1822 }
1823
1824 priv->emac_base_phys = res->start + pdata->ctrl_reg_offset;
1825 size = resource_size(res);
1826 if (!request_mem_region(res->start, size, ndev->name)) {
1827 dev_err(&pdev->dev, "failed request_mem_region() for regs\n");
1828 rc = -ENXIO;
1829 goto probe_quit;
1830 }
1831
1832 priv->remap_addr = ioremap(res->start, size);
1833 if (!priv->remap_addr) {
1834 dev_err(&pdev->dev, "unable to map IO\n");
1835 rc = -ENOMEM;
1836 release_mem_region(res->start, size);
1837 goto probe_quit;
1838 }
1839 priv->emac_base = priv->remap_addr + pdata->ctrl_reg_offset;
1840 ndev->base_addr = (unsigned long)priv->remap_addr;
1841
1842 priv->ctrl_base = priv->remap_addr + pdata->ctrl_mod_reg_offset;
1843
1844 hw_ram_addr = pdata->hw_ram_addr;
1845 if (!hw_ram_addr)
1846 hw_ram_addr = (u32 __force)res->start + pdata->ctrl_ram_offset;
1847
1848 memset(&dma_params, 0, sizeof(dma_params));
1849 dma_params.dev = emac_dev;
1850 dma_params.dmaregs = priv->emac_base;
1851 dma_params.rxthresh = priv->emac_base + 0x120;
1852 dma_params.rxfree = priv->emac_base + 0x140;
1853 dma_params.txhdp = priv->emac_base + 0x600;
1854 dma_params.rxhdp = priv->emac_base + 0x620;
1855 dma_params.txcp = priv->emac_base + 0x640;
1856 dma_params.rxcp = priv->emac_base + 0x660;
1857 dma_params.num_chan = EMAC_MAX_TXRX_CHANNELS;
1858 dma_params.min_packet_size = EMAC_DEF_MIN_ETHPKTSIZE;
1859 dma_params.desc_hw_addr = hw_ram_addr;
1860 dma_params.desc_mem_size = pdata->ctrl_ram_size;
1861 dma_params.desc_align = 16;
1862
1863 dma_params.desc_mem_phys = pdata->no_bd_ram ? 0 :
1864 (u32 __force)res->start + pdata->ctrl_ram_offset;
1865
1866 priv->dma = cpdma_ctlr_create(&dma_params);
1867 if (!priv->dma) {
1868 dev_err(&pdev->dev, "error initializing DMA\n");
1869 rc = -ENOMEM;
1870 goto no_dma;
1871 }
1872
1873 priv->txchan = cpdma_chan_create(priv->dma, tx_chan_num(EMAC_DEF_TX_CH),
1874 emac_tx_handler);
1875 priv->rxchan = cpdma_chan_create(priv->dma, rx_chan_num(EMAC_DEF_RX_CH),
1876 emac_rx_handler);
1877 if (WARN_ON(!priv->txchan || !priv->rxchan)) {
1878 rc = -ENOMEM;
1879 goto no_irq_res;
1880 }
1881
1882 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1883 if (!res) {
1884 dev_err(&pdev->dev, "error getting irq res\n");
1885 rc = -ENOENT;
1886 goto no_irq_res;
1887 }
1888 ndev->irq = res->start;
1889
1890 if (!is_valid_ether_addr(priv->mac_addr)) {
1891 /* Use random MAC if none passed */
1892 random_ether_addr(priv->mac_addr);
1893 dev_warn(&pdev->dev, "using random MAC addr: %pM\n",
1894 priv->mac_addr);
1895 }
1896
1897 ndev->netdev_ops = &emac_netdev_ops;
1898 SET_ETHTOOL_OPS(ndev, ðtool_ops);
1899 netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT);
1900
1901 clk_enable(emac_clk);
1902
1903 /* register the network device */
1904 SET_NETDEV_DEV(ndev, &pdev->dev);
1905 rc = register_netdev(ndev);
1906 if (rc) {
1907 dev_err(&pdev->dev, "error in register_netdev\n");
1908 rc = -ENODEV;
1909 goto netdev_reg_err;
1910 }
1911
1912
1913 if (netif_msg_probe(priv)) {
1914 dev_notice(emac_dev, "DaVinci EMAC Probe found device "\
1915 "(regs: %p, irq: %d)\n",
1916 (void *)priv->emac_base_phys, ndev->irq);
1917 }
1918 return 0;
1919
1920netdev_reg_err:
1921 clk_disable(emac_clk);
1922no_irq_res:
1923 if (priv->txchan)
1924 cpdma_chan_destroy(priv->txchan);
1925 if (priv->rxchan)
1926 cpdma_chan_destroy(priv->rxchan);
1927 cpdma_ctlr_destroy(priv->dma);
1928no_dma:
1929 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1930 release_mem_region(res->start, resource_size(res));
1931 iounmap(priv->remap_addr);
1932
1933probe_quit:
1934 free_netdev(ndev);
1935free_clk:
1936 clk_put(emac_clk);
1937 return rc;
1938}
1939
1940/**
1941 * davinci_emac_remove: EMAC device remove
1942 * @pdev: The DaVinci EMAC device that we are removing
1943 *
1944 * Called when removing the device driver. We disable clock usage and release
1945 * the resources taken up by the driver and unregister network device
1946 */
1947static int __devexit davinci_emac_remove(struct platform_device *pdev)
1948{
1949 struct resource *res;
1950 struct net_device *ndev = platform_get_drvdata(pdev);
1951 struct emac_priv *priv = netdev_priv(ndev);
1952
1953 dev_notice(&ndev->dev, "DaVinci EMAC: davinci_emac_remove()\n");
1954
1955 platform_set_drvdata(pdev, NULL);
1956 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1957
1958 if (priv->txchan)
1959 cpdma_chan_destroy(priv->txchan);
1960 if (priv->rxchan)
1961 cpdma_chan_destroy(priv->rxchan);
1962 cpdma_ctlr_destroy(priv->dma);
1963
1964 release_mem_region(res->start, resource_size(res));
1965
1966 unregister_netdev(ndev);
1967 iounmap(priv->remap_addr);
1968 free_netdev(ndev);
1969
1970 clk_disable(emac_clk);
1971 clk_put(emac_clk);
1972
1973 return 0;
1974}
1975
1976static int davinci_emac_suspend(struct device *dev)
1977{
1978 struct platform_device *pdev = to_platform_device(dev);
1979 struct net_device *ndev = platform_get_drvdata(pdev);
1980
1981 if (netif_running(ndev))
1982 emac_dev_stop(ndev);
1983
1984 clk_disable(emac_clk);
1985
1986 return 0;
1987}
1988
1989static int davinci_emac_resume(struct device *dev)
1990{
1991 struct platform_device *pdev = to_platform_device(dev);
1992 struct net_device *ndev = platform_get_drvdata(pdev);
1993
1994 clk_enable(emac_clk);
1995
1996 if (netif_running(ndev))
1997 emac_dev_open(ndev);
1998
1999 return 0;
2000}
2001
2002static const struct dev_pm_ops davinci_emac_pm_ops = {
2003 .suspend = davinci_emac_suspend,
2004 .resume = davinci_emac_resume,
2005};
2006
2007/**
2008 * davinci_emac_driver: EMAC platform driver structure
2009 */
2010static struct platform_driver davinci_emac_driver = {
2011 .driver = {
2012 .name = "davinci_emac",
2013 .owner = THIS_MODULE,
2014 .pm = &davinci_emac_pm_ops,
2015 },
2016 .probe = davinci_emac_probe,
2017 .remove = __devexit_p(davinci_emac_remove),
2018};
2019
2020/**
2021 * davinci_emac_init: EMAC driver module init
2022 *
2023 * Called when initializing the driver. We register the driver with
2024 * the platform.
2025 */
2026static int __init davinci_emac_init(void)
2027{
2028 return platform_driver_register(&davinci_emac_driver);
2029}
2030late_initcall(davinci_emac_init);
2031
2032/**
2033 * davinci_emac_exit: EMAC driver module exit
2034 *
2035 * Called when exiting the driver completely. We unregister the driver with
2036 * the platform and exit
2037 */
2038static void __exit davinci_emac_exit(void)
2039{
2040 platform_driver_unregister(&davinci_emac_driver);
2041}
2042module_exit(davinci_emac_exit);
2043
2044MODULE_LICENSE("GPL");
2045MODULE_AUTHOR("DaVinci EMAC Maintainer: Anant Gole <anantgole@ti.com>");
2046MODULE_AUTHOR("DaVinci EMAC Maintainer: Chaithrika U S <chaithrika@ti.com>");
2047MODULE_DESCRIPTION("DaVinci EMAC Ethernet driver");