1 /*******************************************************************************
2 This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
3 DWC Ether MAC 10/100/1000 Universal version 3.41a has been used for
4 developing this code.
5
6 This only implements the mac core functions for this chip.
7
8 Copyright (C) 2007-2009 STMicroelectronics Ltd
9
10 This program is free software; you can redistribute it and/or modify it
11 under the terms and conditions of the GNU General Public License,
12 version 2, as published by the Free Software Foundation.
13
14 This program is distributed in the hope it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 more details.
18
19 You should have received a copy of the GNU General Public License along with
20 this program; if not, write to the Free Software Foundation, Inc.,
21 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
22
23 The full GNU General Public License is included in this distribution in
24 the file called "COPYING".
25
26 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
27 *******************************************************************************/
28
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
31 #include <linux/ethtool.h>
32 #include <asm/io.h>
33 #include "dwmac1000.h"
34
dwmac1000_core_init(struct mac_device_info * hw,int mtu)35 static void dwmac1000_core_init(struct mac_device_info *hw, int mtu)
36 {
37 void __iomem *ioaddr = hw->pcsr;
38 u32 value = readl(ioaddr + GMAC_CONTROL);
39 value |= GMAC_CORE_INIT;
40 if (mtu > 1500)
41 value |= GMAC_CONTROL_2K;
42 if (mtu > 2000)
43 value |= GMAC_CONTROL_JE;
44
45 writel(value, ioaddr + GMAC_CONTROL);
46
47 /* Mask GMAC interrupts */
48 writel(0x207, ioaddr + GMAC_INT_MASK);
49
50 #ifdef STMMAC_VLAN_TAG_USED
51 /* Tag detection without filtering */
52 writel(0x0, ioaddr + GMAC_VLAN_TAG);
53 #endif
54 }
55
dwmac1000_rx_ipc_enable(struct mac_device_info * hw)56 static int dwmac1000_rx_ipc_enable(struct mac_device_info *hw)
57 {
58 void __iomem *ioaddr = hw->pcsr;
59 u32 value = readl(ioaddr + GMAC_CONTROL);
60
61 if (hw->rx_csum)
62 value |= GMAC_CONTROL_IPC;
63 else
64 value &= ~GMAC_CONTROL_IPC;
65
66 writel(value, ioaddr + GMAC_CONTROL);
67
68 value = readl(ioaddr + GMAC_CONTROL);
69
70 return !!(value & GMAC_CONTROL_IPC);
71 }
72
dwmac1000_dump_regs(struct mac_device_info * hw)73 static void dwmac1000_dump_regs(struct mac_device_info *hw)
74 {
75 void __iomem *ioaddr = hw->pcsr;
76 int i;
77 pr_info("\tDWMAC1000 regs (base addr = 0x%p)\n", ioaddr);
78
79 for (i = 0; i < 55; i++) {
80 int offset = i * 4;
81 pr_info("\tReg No. %d (offset 0x%x): 0x%08x\n", i,
82 offset, readl(ioaddr + offset));
83 }
84 }
85
dwmac1000_set_umac_addr(struct mac_device_info * hw,unsigned char * addr,unsigned int reg_n)86 static void dwmac1000_set_umac_addr(struct mac_device_info *hw,
87 unsigned char *addr,
88 unsigned int reg_n)
89 {
90 void __iomem *ioaddr = hw->pcsr;
91 stmmac_set_mac_addr(ioaddr, addr, GMAC_ADDR_HIGH(reg_n),
92 GMAC_ADDR_LOW(reg_n));
93 }
94
dwmac1000_get_umac_addr(struct mac_device_info * hw,unsigned char * addr,unsigned int reg_n)95 static void dwmac1000_get_umac_addr(struct mac_device_info *hw,
96 unsigned char *addr,
97 unsigned int reg_n)
98 {
99 void __iomem *ioaddr = hw->pcsr;
100 stmmac_get_mac_addr(ioaddr, addr, GMAC_ADDR_HIGH(reg_n),
101 GMAC_ADDR_LOW(reg_n));
102 }
103
dwmac1000_set_mchash(void __iomem * ioaddr,u32 * mcfilterbits,int mcbitslog2)104 static void dwmac1000_set_mchash(void __iomem *ioaddr, u32 *mcfilterbits,
105 int mcbitslog2)
106 {
107 int numhashregs, regs;
108
109 switch (mcbitslog2) {
110 case 6:
111 writel(mcfilterbits[0], ioaddr + GMAC_HASH_LOW);
112 writel(mcfilterbits[1], ioaddr + GMAC_HASH_HIGH);
113 return;
114 break;
115 case 7:
116 numhashregs = 4;
117 break;
118 case 8:
119 numhashregs = 8;
120 break;
121 default:
122 pr_debug("STMMAC: err in setting mulitcast filter\n");
123 return;
124 break;
125 }
126 for (regs = 0; regs < numhashregs; regs++)
127 writel(mcfilterbits[regs],
128 ioaddr + GMAC_EXTHASH_BASE + regs * 4);
129 }
130
dwmac1000_set_filter(struct mac_device_info * hw,struct net_device * dev)131 static void dwmac1000_set_filter(struct mac_device_info *hw,
132 struct net_device *dev)
133 {
134 void __iomem *ioaddr = (void __iomem *)dev->base_addr;
135 unsigned int value = 0;
136 unsigned int perfect_addr_number = hw->unicast_filter_entries;
137 u32 mc_filter[8];
138 int mcbitslog2 = hw->mcast_bits_log2;
139
140 pr_debug("%s: # mcasts %d, # unicast %d\n", __func__,
141 netdev_mc_count(dev), netdev_uc_count(dev));
142
143 memset(mc_filter, 0, sizeof(mc_filter));
144
145 if (dev->flags & IFF_PROMISC) {
146 value = GMAC_FRAME_FILTER_PR;
147 } else if (dev->flags & IFF_ALLMULTI) {
148 value = GMAC_FRAME_FILTER_PM; /* pass all multi */
149 } else if (!netdev_mc_empty(dev)) {
150 struct netdev_hw_addr *ha;
151
152 /* Hash filter for multicast */
153 value = GMAC_FRAME_FILTER_HMC;
154
155 netdev_for_each_mc_addr(ha, dev) {
156 /* The upper n bits of the calculated CRC are used to
157 * index the contents of the hash table. The number of
158 * bits used depends on the hardware configuration
159 * selected at core configuration time.
160 */
161 int bit_nr = bitrev32(~crc32_le(~0, ha->addr,
162 ETH_ALEN)) >>
163 (32 - mcbitslog2);
164 /* The most significant bit determines the register to
165 * use (H/L) while the other 5 bits determine the bit
166 * within the register.
167 */
168 mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
169 }
170 }
171
172 dwmac1000_set_mchash(ioaddr, mc_filter, mcbitslog2);
173
174 /* Handle multiple unicast addresses (perfect filtering) */
175 if (netdev_uc_count(dev) > perfect_addr_number)
176 /* Switch to promiscuous mode if more than unicast
177 * addresses are requested than supported by hardware.
178 */
179 value |= GMAC_FRAME_FILTER_PR;
180 else {
181 int reg = 1;
182 struct netdev_hw_addr *ha;
183
184 netdev_for_each_uc_addr(ha, dev) {
185 stmmac_set_mac_addr(ioaddr, ha->addr,
186 GMAC_ADDR_HIGH(reg),
187 GMAC_ADDR_LOW(reg));
188 reg++;
189 }
190 }
191
192 #ifdef FRAME_FILTER_DEBUG
193 /* Enable Receive all mode (to debug filtering_fail errors) */
194 value |= GMAC_FRAME_FILTER_RA;
195 #endif
196 writel(value, ioaddr + GMAC_FRAME_FILTER);
197 }
198
199
dwmac1000_flow_ctrl(struct mac_device_info * hw,unsigned int duplex,unsigned int fc,unsigned int pause_time)200 static void dwmac1000_flow_ctrl(struct mac_device_info *hw, unsigned int duplex,
201 unsigned int fc, unsigned int pause_time)
202 {
203 void __iomem *ioaddr = hw->pcsr;
204 /* Set flow such that DZPQ in Mac Register 6 is 0,
205 * and unicast pause detect is enabled.
206 */
207 unsigned int flow = GMAC_FLOW_CTRL_UP;
208
209 pr_debug("GMAC Flow-Control:\n");
210 if (fc & FLOW_RX) {
211 pr_debug("\tReceive Flow-Control ON\n");
212 flow |= GMAC_FLOW_CTRL_RFE;
213 }
214 if (fc & FLOW_TX) {
215 pr_debug("\tTransmit Flow-Control ON\n");
216 flow |= GMAC_FLOW_CTRL_TFE;
217 }
218
219 if (duplex) {
220 pr_debug("\tduplex mode: PAUSE %d\n", pause_time);
221 flow |= (pause_time << GMAC_FLOW_CTRL_PT_SHIFT);
222 }
223
224 writel(flow, ioaddr + GMAC_FLOW_CTRL);
225 }
226
dwmac1000_pmt(struct mac_device_info * hw,unsigned long mode)227 static void dwmac1000_pmt(struct mac_device_info *hw, unsigned long mode)
228 {
229 void __iomem *ioaddr = hw->pcsr;
230 unsigned int pmt = 0;
231
232 if (mode & WAKE_MAGIC) {
233 pr_debug("GMAC: WOL Magic frame\n");
234 pmt |= power_down | magic_pkt_en;
235 }
236 if (mode & WAKE_UCAST) {
237 pr_debug("GMAC: WOL on global unicast\n");
238 pmt |= global_unicast;
239 }
240
241 writel(pmt, ioaddr + GMAC_PMT);
242 }
243
dwmac1000_irq_status(struct mac_device_info * hw,struct stmmac_extra_stats * x)244 static int dwmac1000_irq_status(struct mac_device_info *hw,
245 struct stmmac_extra_stats *x)
246 {
247 void __iomem *ioaddr = hw->pcsr;
248 u32 intr_status = readl(ioaddr + GMAC_INT_STATUS);
249 int ret = 0;
250
251 /* Not used events (e.g. MMC interrupts) are not handled. */
252 if ((intr_status & mmc_tx_irq))
253 x->mmc_tx_irq_n++;
254 if (unlikely(intr_status & mmc_rx_irq))
255 x->mmc_rx_irq_n++;
256 if (unlikely(intr_status & mmc_rx_csum_offload_irq))
257 x->mmc_rx_csum_offload_irq_n++;
258 if (unlikely(intr_status & pmt_irq)) {
259 /* clear the PMT bits 5 and 6 by reading the PMT status reg */
260 readl(ioaddr + GMAC_PMT);
261 x->irq_receive_pmt_irq_n++;
262 }
263 /* MAC trx/rx EEE LPI entry/exit interrupts */
264 if (intr_status & lpiis_irq) {
265 /* Clean LPI interrupt by reading the Reg 12 */
266 ret = readl(ioaddr + LPI_CTRL_STATUS);
267
268 if (ret & LPI_CTRL_STATUS_TLPIEN)
269 x->irq_tx_path_in_lpi_mode_n++;
270 if (ret & LPI_CTRL_STATUS_TLPIEX)
271 x->irq_tx_path_exit_lpi_mode_n++;
272 if (ret & LPI_CTRL_STATUS_RLPIEN)
273 x->irq_rx_path_in_lpi_mode_n++;
274 if (ret & LPI_CTRL_STATUS_RLPIEX)
275 x->irq_rx_path_exit_lpi_mode_n++;
276 }
277
278 if ((intr_status & pcs_ane_irq) || (intr_status & pcs_link_irq)) {
279 readl(ioaddr + GMAC_AN_STATUS);
280 x->irq_pcs_ane_n++;
281 }
282 if (intr_status & rgmii_irq) {
283 u32 status = readl(ioaddr + GMAC_S_R_GMII);
284 x->irq_rgmii_n++;
285
286 /* Save and dump the link status. */
287 if (status & GMAC_S_R_GMII_LINK) {
288 int speed_value = (status & GMAC_S_R_GMII_SPEED) >>
289 GMAC_S_R_GMII_SPEED_SHIFT;
290 x->pcs_duplex = (status & GMAC_S_R_GMII_MODE);
291
292 if (speed_value == GMAC_S_R_GMII_SPEED_125)
293 x->pcs_speed = SPEED_1000;
294 else if (speed_value == GMAC_S_R_GMII_SPEED_25)
295 x->pcs_speed = SPEED_100;
296 else
297 x->pcs_speed = SPEED_10;
298
299 x->pcs_link = 1;
300 pr_debug("%s: Link is Up - %d/%s\n", __func__,
301 (int)x->pcs_speed,
302 x->pcs_duplex ? "Full" : "Half");
303 } else {
304 x->pcs_link = 0;
305 pr_debug("%s: Link is Down\n", __func__);
306 }
307 }
308
309 return ret;
310 }
311
dwmac1000_set_eee_mode(struct mac_device_info * hw)312 static void dwmac1000_set_eee_mode(struct mac_device_info *hw)
313 {
314 void __iomem *ioaddr = hw->pcsr;
315 u32 value;
316
317 /* Enable the link status receive on RGMII, SGMII ore SMII
318 * receive path and instruct the transmit to enter in LPI
319 * state.
320 */
321 value = readl(ioaddr + LPI_CTRL_STATUS);
322 value |= LPI_CTRL_STATUS_LPIEN | LPI_CTRL_STATUS_LPITXA;
323 writel(value, ioaddr + LPI_CTRL_STATUS);
324 }
325
dwmac1000_reset_eee_mode(struct mac_device_info * hw)326 static void dwmac1000_reset_eee_mode(struct mac_device_info *hw)
327 {
328 void __iomem *ioaddr = hw->pcsr;
329 u32 value;
330
331 value = readl(ioaddr + LPI_CTRL_STATUS);
332 value &= ~(LPI_CTRL_STATUS_LPIEN | LPI_CTRL_STATUS_LPITXA);
333 writel(value, ioaddr + LPI_CTRL_STATUS);
334 }
335
dwmac1000_set_eee_pls(struct mac_device_info * hw,int link)336 static void dwmac1000_set_eee_pls(struct mac_device_info *hw, int link)
337 {
338 void __iomem *ioaddr = hw->pcsr;
339 u32 value;
340
341 value = readl(ioaddr + LPI_CTRL_STATUS);
342
343 if (link)
344 value |= LPI_CTRL_STATUS_PLS;
345 else
346 value &= ~LPI_CTRL_STATUS_PLS;
347
348 writel(value, ioaddr + LPI_CTRL_STATUS);
349 }
350
dwmac1000_set_eee_timer(struct mac_device_info * hw,int ls,int tw)351 static void dwmac1000_set_eee_timer(struct mac_device_info *hw, int ls, int tw)
352 {
353 void __iomem *ioaddr = hw->pcsr;
354 int value = ((tw & 0xffff)) | ((ls & 0x7ff) << 16);
355
356 /* Program the timers in the LPI timer control register:
357 * LS: minimum time (ms) for which the link
358 * status from PHY should be ok before transmitting
359 * the LPI pattern.
360 * TW: minimum time (us) for which the core waits
361 * after it has stopped transmitting the LPI pattern.
362 */
363 writel(value, ioaddr + LPI_TIMER_CTRL);
364 }
365
dwmac1000_ctrl_ane(struct mac_device_info * hw,bool restart)366 static void dwmac1000_ctrl_ane(struct mac_device_info *hw, bool restart)
367 {
368 void __iomem *ioaddr = hw->pcsr;
369 /* auto negotiation enable and External Loopback enable */
370 u32 value = GMAC_AN_CTRL_ANE | GMAC_AN_CTRL_ELE;
371
372 if (restart)
373 value |= GMAC_AN_CTRL_RAN;
374
375 writel(value, ioaddr + GMAC_AN_CTRL);
376 }
377
dwmac1000_get_adv(struct mac_device_info * hw,struct rgmii_adv * adv)378 static void dwmac1000_get_adv(struct mac_device_info *hw, struct rgmii_adv *adv)
379 {
380 void __iomem *ioaddr = hw->pcsr;
381 u32 value = readl(ioaddr + GMAC_ANE_ADV);
382
383 if (value & GMAC_ANE_FD)
384 adv->duplex = DUPLEX_FULL;
385 if (value & GMAC_ANE_HD)
386 adv->duplex |= DUPLEX_HALF;
387
388 adv->pause = (value & GMAC_ANE_PSE) >> GMAC_ANE_PSE_SHIFT;
389
390 value = readl(ioaddr + GMAC_ANE_LPA);
391
392 if (value & GMAC_ANE_FD)
393 adv->lp_duplex = DUPLEX_FULL;
394 if (value & GMAC_ANE_HD)
395 adv->lp_duplex = DUPLEX_HALF;
396
397 adv->lp_pause = (value & GMAC_ANE_PSE) >> GMAC_ANE_PSE_SHIFT;
398 }
399
400 static const struct stmmac_ops dwmac1000_ops = {
401 .core_init = dwmac1000_core_init,
402 .rx_ipc = dwmac1000_rx_ipc_enable,
403 .dump_regs = dwmac1000_dump_regs,
404 .host_irq_status = dwmac1000_irq_status,
405 .set_filter = dwmac1000_set_filter,
406 .flow_ctrl = dwmac1000_flow_ctrl,
407 .pmt = dwmac1000_pmt,
408 .set_umac_addr = dwmac1000_set_umac_addr,
409 .get_umac_addr = dwmac1000_get_umac_addr,
410 .set_eee_mode = dwmac1000_set_eee_mode,
411 .reset_eee_mode = dwmac1000_reset_eee_mode,
412 .set_eee_timer = dwmac1000_set_eee_timer,
413 .set_eee_pls = dwmac1000_set_eee_pls,
414 .ctrl_ane = dwmac1000_ctrl_ane,
415 .get_adv = dwmac1000_get_adv,
416 };
417
dwmac1000_setup(void __iomem * ioaddr,int mcbins,int perfect_uc_entries)418 struct mac_device_info *dwmac1000_setup(void __iomem *ioaddr, int mcbins,
419 int perfect_uc_entries)
420 {
421 struct mac_device_info *mac;
422 u32 hwid = readl(ioaddr + GMAC_VERSION);
423
424 mac = kzalloc(sizeof(const struct mac_device_info), GFP_KERNEL);
425 if (!mac)
426 return NULL;
427
428 mac->pcsr = ioaddr;
429 mac->multicast_filter_bins = mcbins;
430 mac->unicast_filter_entries = perfect_uc_entries;
431 mac->mcast_bits_log2 = 0;
432
433 if (mac->multicast_filter_bins)
434 mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
435
436 mac->mac = &dwmac1000_ops;
437 mac->dma = &dwmac1000_dma_ops;
438
439 mac->link.port = GMAC_CONTROL_PS;
440 mac->link.duplex = GMAC_CONTROL_DM;
441 mac->link.speed = GMAC_CONTROL_FES;
442 mac->mii.addr = GMAC_MII_ADDR;
443 mac->mii.data = GMAC_MII_DATA;
444 mac->synopsys_uid = hwid;
445
446 return mac;
447 }
448