1 // SPDX-License-Identifier: GPL-2.0+
2 
3 #include <linux/types.h>
4 #include <linux/clk.h>
5 #include <linux/platform_device.h>
6 #include <linux/pm_runtime.h>
7 #include <linux/acpi.h>
8 #include <linux/of_mdio.h>
9 #include <linux/of_net.h>
10 #include <linux/etherdevice.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/netlink.h>
14 #include <linux/bpf.h>
15 #include <linux/bpf_trace.h>
16 
17 #include <net/tcp.h>
18 #include <net/page_pool.h>
19 #include <net/ip6_checksum.h>
20 
21 #define NETSEC_REG_SOFT_RST			0x104
22 #define NETSEC_REG_COM_INIT			0x120
23 
24 #define NETSEC_REG_TOP_STATUS			0x200
25 #define NETSEC_IRQ_RX				BIT(1)
26 #define NETSEC_IRQ_TX				BIT(0)
27 
28 #define NETSEC_REG_TOP_INTEN			0x204
29 #define NETSEC_REG_INTEN_SET			0x234
30 #define NETSEC_REG_INTEN_CLR			0x238
31 
32 #define NETSEC_REG_NRM_TX_STATUS		0x400
33 #define NETSEC_REG_NRM_TX_INTEN			0x404
34 #define NETSEC_REG_NRM_TX_INTEN_SET		0x428
35 #define NETSEC_REG_NRM_TX_INTEN_CLR		0x42c
36 #define NRM_TX_ST_NTOWNR	BIT(17)
37 #define NRM_TX_ST_TR_ERR	BIT(16)
38 #define NRM_TX_ST_TXDONE	BIT(15)
39 #define NRM_TX_ST_TMREXP	BIT(14)
40 
41 #define NETSEC_REG_NRM_RX_STATUS		0x440
42 #define NETSEC_REG_NRM_RX_INTEN			0x444
43 #define NETSEC_REG_NRM_RX_INTEN_SET		0x468
44 #define NETSEC_REG_NRM_RX_INTEN_CLR		0x46c
45 #define NRM_RX_ST_RC_ERR	BIT(16)
46 #define NRM_RX_ST_PKTCNT	BIT(15)
47 #define NRM_RX_ST_TMREXP	BIT(14)
48 
49 #define NETSEC_REG_PKT_CMD_BUF			0xd0
50 
51 #define NETSEC_REG_CLK_EN			0x100
52 
53 #define NETSEC_REG_PKT_CTRL			0x140
54 
55 #define NETSEC_REG_DMA_TMR_CTRL			0x20c
56 #define NETSEC_REG_F_TAIKI_MC_VER		0x22c
57 #define NETSEC_REG_F_TAIKI_VER			0x230
58 #define NETSEC_REG_DMA_HM_CTRL			0x214
59 #define NETSEC_REG_DMA_MH_CTRL			0x220
60 #define NETSEC_REG_ADDR_DIS_CORE		0x218
61 #define NETSEC_REG_DMAC_HM_CMD_BUF		0x210
62 #define NETSEC_REG_DMAC_MH_CMD_BUF		0x21c
63 
64 #define NETSEC_REG_NRM_TX_PKTCNT		0x410
65 
66 #define NETSEC_REG_NRM_TX_DONE_PKTCNT		0x414
67 #define NETSEC_REG_NRM_TX_DONE_TXINT_PKTCNT	0x418
68 
69 #define NETSEC_REG_NRM_TX_TMR			0x41c
70 
71 #define NETSEC_REG_NRM_RX_PKTCNT		0x454
72 #define NETSEC_REG_NRM_RX_RXINT_PKTCNT		0x458
73 #define NETSEC_REG_NRM_TX_TXINT_TMR		0x420
74 #define NETSEC_REG_NRM_RX_RXINT_TMR		0x460
75 
76 #define NETSEC_REG_NRM_RX_TMR			0x45c
77 
78 #define NETSEC_REG_NRM_TX_DESC_START_UP		0x434
79 #define NETSEC_REG_NRM_TX_DESC_START_LW		0x408
80 #define NETSEC_REG_NRM_RX_DESC_START_UP		0x474
81 #define NETSEC_REG_NRM_RX_DESC_START_LW		0x448
82 
83 #define NETSEC_REG_NRM_TX_CONFIG		0x430
84 #define NETSEC_REG_NRM_RX_CONFIG		0x470
85 
86 #define MAC_REG_STATUS				0x1024
87 #define MAC_REG_DATA				0x11c0
88 #define MAC_REG_CMD				0x11c4
89 #define MAC_REG_FLOW_TH				0x11cc
90 #define MAC_REG_INTF_SEL			0x11d4
91 #define MAC_REG_DESC_INIT			0x11fc
92 #define MAC_REG_DESC_SOFT_RST			0x1204
93 #define NETSEC_REG_MODE_TRANS_COMP_STATUS	0x500
94 
95 #define GMAC_REG_MCR				0x0000
96 #define GMAC_REG_MFFR				0x0004
97 #define GMAC_REG_GAR				0x0010
98 #define GMAC_REG_GDR				0x0014
99 #define GMAC_REG_FCR				0x0018
100 #define GMAC_REG_BMR				0x1000
101 #define GMAC_REG_RDLAR				0x100c
102 #define GMAC_REG_TDLAR				0x1010
103 #define GMAC_REG_OMR				0x1018
104 
105 #define MHZ(n)		((n) * 1000 * 1000)
106 
107 #define NETSEC_TX_SHIFT_OWN_FIELD		31
108 #define NETSEC_TX_SHIFT_LD_FIELD		30
109 #define NETSEC_TX_SHIFT_DRID_FIELD		24
110 #define NETSEC_TX_SHIFT_PT_FIELD		21
111 #define NETSEC_TX_SHIFT_TDRID_FIELD		16
112 #define NETSEC_TX_SHIFT_CC_FIELD		15
113 #define NETSEC_TX_SHIFT_FS_FIELD		9
114 #define NETSEC_TX_LAST				8
115 #define NETSEC_TX_SHIFT_CO			7
116 #define NETSEC_TX_SHIFT_SO			6
117 #define NETSEC_TX_SHIFT_TRS_FIELD		4
118 
119 #define NETSEC_RX_PKT_OWN_FIELD			31
120 #define NETSEC_RX_PKT_LD_FIELD			30
121 #define NETSEC_RX_PKT_SDRID_FIELD		24
122 #define NETSEC_RX_PKT_FR_FIELD			23
123 #define NETSEC_RX_PKT_ER_FIELD			21
124 #define NETSEC_RX_PKT_ERR_FIELD			16
125 #define NETSEC_RX_PKT_TDRID_FIELD		12
126 #define NETSEC_RX_PKT_FS_FIELD			9
127 #define NETSEC_RX_PKT_LS_FIELD			8
128 #define NETSEC_RX_PKT_CO_FIELD			6
129 
130 #define NETSEC_RX_PKT_ERR_MASK			3
131 
132 #define NETSEC_MAX_TX_PKT_LEN			1518
133 #define NETSEC_MAX_TX_JUMBO_PKT_LEN		9018
134 
135 #define NETSEC_RING_GMAC			15
136 #define NETSEC_RING_MAX				2
137 
138 #define NETSEC_TCP_SEG_LEN_MAX			1460
139 #define NETSEC_TCP_JUMBO_SEG_LEN_MAX		8960
140 
141 #define NETSEC_RX_CKSUM_NOTAVAIL		0
142 #define NETSEC_RX_CKSUM_OK			1
143 #define NETSEC_RX_CKSUM_NG			2
144 
145 #define NETSEC_TOP_IRQ_REG_CODE_LOAD_END	BIT(20)
146 #define NETSEC_IRQ_TRANSITION_COMPLETE		BIT(4)
147 
148 #define NETSEC_MODE_TRANS_COMP_IRQ_N2T		BIT(20)
149 #define NETSEC_MODE_TRANS_COMP_IRQ_T2N		BIT(19)
150 
151 #define NETSEC_INT_PKTCNT_MAX			2047
152 
153 #define NETSEC_FLOW_START_TH_MAX		95
154 #define NETSEC_FLOW_STOP_TH_MAX			95
155 #define NETSEC_FLOW_PAUSE_TIME_MIN		5
156 
157 #define NETSEC_CLK_EN_REG_DOM_ALL		0x3f
158 
159 #define NETSEC_PKT_CTRL_REG_MODE_NRM		BIT(28)
160 #define NETSEC_PKT_CTRL_REG_EN_JUMBO		BIT(27)
161 #define NETSEC_PKT_CTRL_REG_LOG_CHKSUM_ER	BIT(3)
162 #define NETSEC_PKT_CTRL_REG_LOG_HD_INCOMPLETE	BIT(2)
163 #define NETSEC_PKT_CTRL_REG_LOG_HD_ER		BIT(1)
164 #define NETSEC_PKT_CTRL_REG_DRP_NO_MATCH	BIT(0)
165 
166 #define NETSEC_CLK_EN_REG_DOM_G			BIT(5)
167 #define NETSEC_CLK_EN_REG_DOM_C			BIT(1)
168 #define NETSEC_CLK_EN_REG_DOM_D			BIT(0)
169 
170 #define NETSEC_COM_INIT_REG_DB			BIT(2)
171 #define NETSEC_COM_INIT_REG_CLS			BIT(1)
172 #define NETSEC_COM_INIT_REG_ALL			(NETSEC_COM_INIT_REG_CLS | \
173 						 NETSEC_COM_INIT_REG_DB)
174 
175 #define NETSEC_SOFT_RST_REG_RESET		0
176 #define NETSEC_SOFT_RST_REG_RUN			BIT(31)
177 
178 #define NETSEC_DMA_CTRL_REG_STOP		1
179 #define MH_CTRL__MODE_TRANS			BIT(20)
180 
181 #define NETSEC_GMAC_CMD_ST_READ			0
182 #define NETSEC_GMAC_CMD_ST_WRITE		BIT(28)
183 #define NETSEC_GMAC_CMD_ST_BUSY			BIT(31)
184 
185 #define NETSEC_GMAC_BMR_REG_COMMON		0x00412080
186 #define NETSEC_GMAC_BMR_REG_RESET		0x00020181
187 #define NETSEC_GMAC_BMR_REG_SWR			0x00000001
188 
189 #define NETSEC_GMAC_OMR_REG_ST			BIT(13)
190 #define NETSEC_GMAC_OMR_REG_SR			BIT(1)
191 
192 #define NETSEC_GMAC_MCR_REG_IBN			BIT(30)
193 #define NETSEC_GMAC_MCR_REG_CST			BIT(25)
194 #define NETSEC_GMAC_MCR_REG_JE			BIT(20)
195 #define NETSEC_MCR_PS				BIT(15)
196 #define NETSEC_GMAC_MCR_REG_FES			BIT(14)
197 #define NETSEC_GMAC_MCR_REG_FULL_DUPLEX_COMMON	0x0000280c
198 #define NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON	0x0001a00c
199 
200 #define NETSEC_FCR_RFE				BIT(2)
201 #define NETSEC_FCR_TFE				BIT(1)
202 
203 #define NETSEC_GMAC_GAR_REG_GW			BIT(1)
204 #define NETSEC_GMAC_GAR_REG_GB			BIT(0)
205 
206 #define NETSEC_GMAC_GAR_REG_SHIFT_PA		11
207 #define NETSEC_GMAC_GAR_REG_SHIFT_GR		6
208 #define GMAC_REG_SHIFT_CR_GAR			2
209 
210 #define NETSEC_GMAC_GAR_REG_CR_25_35_MHZ	2
211 #define NETSEC_GMAC_GAR_REG_CR_35_60_MHZ	3
212 #define NETSEC_GMAC_GAR_REG_CR_60_100_MHZ	0
213 #define NETSEC_GMAC_GAR_REG_CR_100_150_MHZ	1
214 #define NETSEC_GMAC_GAR_REG_CR_150_250_MHZ	4
215 #define NETSEC_GMAC_GAR_REG_CR_250_300_MHZ	5
216 
217 #define NETSEC_GMAC_RDLAR_REG_COMMON		0x18000
218 #define NETSEC_GMAC_TDLAR_REG_COMMON		0x1c000
219 
220 #define NETSEC_REG_NETSEC_VER_F_TAIKI		0x50000
221 
222 #define NETSEC_REG_DESC_RING_CONFIG_CFG_UP	BIT(31)
223 #define NETSEC_REG_DESC_RING_CONFIG_CH_RST	BIT(30)
224 #define NETSEC_REG_DESC_TMR_MODE		4
225 #define NETSEC_REG_DESC_ENDIAN			0
226 
227 #define NETSEC_MAC_DESC_SOFT_RST_SOFT_RST	1
228 #define NETSEC_MAC_DESC_INIT_REG_INIT		1
229 
230 #define NETSEC_EEPROM_MAC_ADDRESS		0x00
231 #define NETSEC_EEPROM_HM_ME_ADDRESS_H		0x08
232 #define NETSEC_EEPROM_HM_ME_ADDRESS_L		0x0C
233 #define NETSEC_EEPROM_HM_ME_SIZE		0x10
234 #define NETSEC_EEPROM_MH_ME_ADDRESS_H		0x14
235 #define NETSEC_EEPROM_MH_ME_ADDRESS_L		0x18
236 #define NETSEC_EEPROM_MH_ME_SIZE		0x1C
237 #define NETSEC_EEPROM_PKT_ME_ADDRESS		0x20
238 #define NETSEC_EEPROM_PKT_ME_SIZE		0x24
239 
240 #define DESC_NUM	256
241 
242 #define NETSEC_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
243 #define NETSEC_RXBUF_HEADROOM (max(XDP_PACKET_HEADROOM, NET_SKB_PAD) + \
244 			       NET_IP_ALIGN)
245 #define NETSEC_RX_BUF_NON_DATA (NETSEC_RXBUF_HEADROOM + \
246 				SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
247 #define NETSEC_RX_BUF_SIZE	(PAGE_SIZE - NETSEC_RX_BUF_NON_DATA)
248 
249 #define DESC_SZ	sizeof(struct netsec_de)
250 
251 #define NETSEC_F_NETSEC_VER_MAJOR_NUM(x)	((x) & 0xffff0000)
252 
253 #define NETSEC_XDP_PASS          0
254 #define NETSEC_XDP_CONSUMED      BIT(0)
255 #define NETSEC_XDP_TX            BIT(1)
256 #define NETSEC_XDP_REDIR         BIT(2)
257 
258 enum ring_id {
259 	NETSEC_RING_TX = 0,
260 	NETSEC_RING_RX
261 };
262 
263 enum buf_type {
264 	TYPE_NETSEC_SKB = 0,
265 	TYPE_NETSEC_XDP_TX,
266 	TYPE_NETSEC_XDP_NDO,
267 };
268 
269 struct netsec_desc {
270 	union {
271 		struct sk_buff *skb;
272 		struct xdp_frame *xdpf;
273 	};
274 	dma_addr_t dma_addr;
275 	void *addr;
276 	u16 len;
277 	u8 buf_type;
278 };
279 
280 struct netsec_desc_ring {
281 	dma_addr_t desc_dma;
282 	struct netsec_desc *desc;
283 	void *vaddr;
284 	u16 head, tail;
285 	u16 xdp_xmit; /* netsec_xdp_xmit packets */
286 	struct page_pool *page_pool;
287 	struct xdp_rxq_info xdp_rxq;
288 	spinlock_t lock; /* XDP tx queue locking */
289 };
290 
291 struct netsec_priv {
292 	struct netsec_desc_ring desc_ring[NETSEC_RING_MAX];
293 	struct ethtool_coalesce et_coalesce;
294 	struct bpf_prog *xdp_prog;
295 	spinlock_t reglock; /* protect reg access */
296 	struct napi_struct napi;
297 	phy_interface_t phy_interface;
298 	struct net_device *ndev;
299 	struct device_node *phy_np;
300 	struct phy_device *phydev;
301 	struct mii_bus *mii_bus;
302 	void __iomem *ioaddr;
303 	void __iomem *eeprom_base;
304 	struct device *dev;
305 	struct clk *clk;
306 	u32 msg_enable;
307 	u32 freq;
308 	u32 phy_addr;
309 	bool rx_cksum_offload_flag;
310 };
311 
312 struct netsec_de { /* Netsec Descriptor layout */
313 	u32 attr;
314 	u32 data_buf_addr_up;
315 	u32 data_buf_addr_lw;
316 	u32 buf_len_info;
317 };
318 
319 struct netsec_tx_pkt_ctrl {
320 	u16 tcp_seg_len;
321 	bool tcp_seg_offload_flag;
322 	bool cksum_offload_flag;
323 };
324 
325 struct netsec_rx_pkt_info {
326 	int rx_cksum_result;
327 	int err_code;
328 	bool err_flag;
329 };
330 
331 static void netsec_write(struct netsec_priv *priv, u32 reg_addr, u32 val)
332 {
333 	writel(val, priv->ioaddr + reg_addr);
334 }
335 
336 static u32 netsec_read(struct netsec_priv *priv, u32 reg_addr)
337 {
338 	return readl(priv->ioaddr + reg_addr);
339 }
340 
341 /************* MDIO BUS OPS FOLLOW *************/
342 
343 #define TIMEOUT_SPINS_MAC		1000
344 #define TIMEOUT_SECONDARY_MS_MAC	100
345 
346 static u32 netsec_clk_type(u32 freq)
347 {
348 	if (freq < MHZ(35))
349 		return NETSEC_GMAC_GAR_REG_CR_25_35_MHZ;
350 	if (freq < MHZ(60))
351 		return NETSEC_GMAC_GAR_REG_CR_35_60_MHZ;
352 	if (freq < MHZ(100))
353 		return NETSEC_GMAC_GAR_REG_CR_60_100_MHZ;
354 	if (freq < MHZ(150))
355 		return NETSEC_GMAC_GAR_REG_CR_100_150_MHZ;
356 	if (freq < MHZ(250))
357 		return NETSEC_GMAC_GAR_REG_CR_150_250_MHZ;
358 
359 	return NETSEC_GMAC_GAR_REG_CR_250_300_MHZ;
360 }
361 
362 static int netsec_wait_while_busy(struct netsec_priv *priv, u32 addr, u32 mask)
363 {
364 	u32 timeout = TIMEOUT_SPINS_MAC;
365 
366 	while (--timeout && netsec_read(priv, addr) & mask)
367 		cpu_relax();
368 	if (timeout)
369 		return 0;
370 
371 	timeout = TIMEOUT_SECONDARY_MS_MAC;
372 	while (--timeout && netsec_read(priv, addr) & mask)
373 		usleep_range(1000, 2000);
374 
375 	if (timeout)
376 		return 0;
377 
378 	netdev_WARN(priv->ndev, "%s: timeout\n", __func__);
379 
380 	return -ETIMEDOUT;
381 }
382 
383 static int netsec_mac_write(struct netsec_priv *priv, u32 addr, u32 value)
384 {
385 	netsec_write(priv, MAC_REG_DATA, value);
386 	netsec_write(priv, MAC_REG_CMD, addr | NETSEC_GMAC_CMD_ST_WRITE);
387 	return netsec_wait_while_busy(priv,
388 				      MAC_REG_CMD, NETSEC_GMAC_CMD_ST_BUSY);
389 }
390 
391 static int netsec_mac_read(struct netsec_priv *priv, u32 addr, u32 *read)
392 {
393 	int ret;
394 
395 	netsec_write(priv, MAC_REG_CMD, addr | NETSEC_GMAC_CMD_ST_READ);
396 	ret = netsec_wait_while_busy(priv,
397 				     MAC_REG_CMD, NETSEC_GMAC_CMD_ST_BUSY);
398 	if (ret)
399 		return ret;
400 
401 	*read = netsec_read(priv, MAC_REG_DATA);
402 
403 	return 0;
404 }
405 
406 static int netsec_mac_wait_while_busy(struct netsec_priv *priv,
407 				      u32 addr, u32 mask)
408 {
409 	u32 timeout = TIMEOUT_SPINS_MAC;
410 	int ret, data;
411 
412 	do {
413 		ret = netsec_mac_read(priv, addr, &data);
414 		if (ret)
415 			break;
416 		cpu_relax();
417 	} while (--timeout && (data & mask));
418 
419 	if (timeout)
420 		return 0;
421 
422 	timeout = TIMEOUT_SECONDARY_MS_MAC;
423 	do {
424 		usleep_range(1000, 2000);
425 
426 		ret = netsec_mac_read(priv, addr, &data);
427 		if (ret)
428 			break;
429 		cpu_relax();
430 	} while (--timeout && (data & mask));
431 
432 	if (timeout && !ret)
433 		return 0;
434 
435 	netdev_WARN(priv->ndev, "%s: timeout\n", __func__);
436 
437 	return -ETIMEDOUT;
438 }
439 
440 static int netsec_mac_update_to_phy_state(struct netsec_priv *priv)
441 {
442 	struct phy_device *phydev = priv->ndev->phydev;
443 	u32 value = 0;
444 
445 	value = phydev->duplex ? NETSEC_GMAC_MCR_REG_FULL_DUPLEX_COMMON :
446 				 NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON;
447 
448 	if (phydev->speed != SPEED_1000)
449 		value |= NETSEC_MCR_PS;
450 
451 	if (priv->phy_interface != PHY_INTERFACE_MODE_GMII &&
452 	    phydev->speed == SPEED_100)
453 		value |= NETSEC_GMAC_MCR_REG_FES;
454 
455 	value |= NETSEC_GMAC_MCR_REG_CST | NETSEC_GMAC_MCR_REG_JE;
456 
457 	if (phy_interface_mode_is_rgmii(priv->phy_interface))
458 		value |= NETSEC_GMAC_MCR_REG_IBN;
459 
460 	if (netsec_mac_write(priv, GMAC_REG_MCR, value))
461 		return -ETIMEDOUT;
462 
463 	return 0;
464 }
465 
466 static int netsec_phy_read(struct mii_bus *bus, int phy_addr, int reg_addr);
467 
468 static int netsec_phy_write(struct mii_bus *bus,
469 			    int phy_addr, int reg, u16 val)
470 {
471 	int status;
472 	struct netsec_priv *priv = bus->priv;
473 
474 	if (netsec_mac_write(priv, GMAC_REG_GDR, val))
475 		return -ETIMEDOUT;
476 	if (netsec_mac_write(priv, GMAC_REG_GAR,
477 			     phy_addr << NETSEC_GMAC_GAR_REG_SHIFT_PA |
478 			     reg << NETSEC_GMAC_GAR_REG_SHIFT_GR |
479 			     NETSEC_GMAC_GAR_REG_GW | NETSEC_GMAC_GAR_REG_GB |
480 			     (netsec_clk_type(priv->freq) <<
481 			      GMAC_REG_SHIFT_CR_GAR)))
482 		return -ETIMEDOUT;
483 
484 	status = netsec_mac_wait_while_busy(priv, GMAC_REG_GAR,
485 					    NETSEC_GMAC_GAR_REG_GB);
486 
487 	/* Developerbox implements RTL8211E PHY and there is
488 	 * a compatibility problem with F_GMAC4.
489 	 * RTL8211E expects MDC clock must be kept toggling for several
490 	 * clock cycle with MDIO high before entering the IDLE state.
491 	 * To meet this requirement, netsec driver needs to issue dummy
492 	 * read(e.g. read PHYID1(offset 0x2) register) right after write.
493 	 */
494 	netsec_phy_read(bus, phy_addr, MII_PHYSID1);
495 
496 	return status;
497 }
498 
499 static int netsec_phy_read(struct mii_bus *bus, int phy_addr, int reg_addr)
500 {
501 	struct netsec_priv *priv = bus->priv;
502 	u32 data;
503 	int ret;
504 
505 	if (netsec_mac_write(priv, GMAC_REG_GAR, NETSEC_GMAC_GAR_REG_GB |
506 			     phy_addr << NETSEC_GMAC_GAR_REG_SHIFT_PA |
507 			     reg_addr << NETSEC_GMAC_GAR_REG_SHIFT_GR |
508 			     (netsec_clk_type(priv->freq) <<
509 			      GMAC_REG_SHIFT_CR_GAR)))
510 		return -ETIMEDOUT;
511 
512 	ret = netsec_mac_wait_while_busy(priv, GMAC_REG_GAR,
513 					 NETSEC_GMAC_GAR_REG_GB);
514 	if (ret)
515 		return ret;
516 
517 	ret = netsec_mac_read(priv, GMAC_REG_GDR, &data);
518 	if (ret)
519 		return ret;
520 
521 	return data;
522 }
523 
524 /************* ETHTOOL_OPS FOLLOW *************/
525 
526 static void netsec_et_get_drvinfo(struct net_device *net_device,
527 				  struct ethtool_drvinfo *info)
528 {
529 	strscpy(info->driver, "netsec", sizeof(info->driver));
530 	strscpy(info->bus_info, dev_name(net_device->dev.parent),
531 		sizeof(info->bus_info));
532 }
533 
534 static int netsec_et_get_coalesce(struct net_device *net_device,
535 				  struct ethtool_coalesce *et_coalesce,
536 				  struct kernel_ethtool_coalesce *kernel_coal,
537 				  struct netlink_ext_ack *extack)
538 {
539 	struct netsec_priv *priv = netdev_priv(net_device);
540 
541 	*et_coalesce = priv->et_coalesce;
542 
543 	return 0;
544 }
545 
546 static int netsec_et_set_coalesce(struct net_device *net_device,
547 				  struct ethtool_coalesce *et_coalesce,
548 				  struct kernel_ethtool_coalesce *kernel_coal,
549 				  struct netlink_ext_ack *extack)
550 {
551 	struct netsec_priv *priv = netdev_priv(net_device);
552 
553 	priv->et_coalesce = *et_coalesce;
554 
555 	if (priv->et_coalesce.tx_coalesce_usecs < 50)
556 		priv->et_coalesce.tx_coalesce_usecs = 50;
557 	if (priv->et_coalesce.tx_max_coalesced_frames < 1)
558 		priv->et_coalesce.tx_max_coalesced_frames = 1;
559 
560 	netsec_write(priv, NETSEC_REG_NRM_TX_DONE_TXINT_PKTCNT,
561 		     priv->et_coalesce.tx_max_coalesced_frames);
562 	netsec_write(priv, NETSEC_REG_NRM_TX_TXINT_TMR,
563 		     priv->et_coalesce.tx_coalesce_usecs);
564 	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_SET, NRM_TX_ST_TXDONE);
565 	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_SET, NRM_TX_ST_TMREXP);
566 
567 	if (priv->et_coalesce.rx_coalesce_usecs < 50)
568 		priv->et_coalesce.rx_coalesce_usecs = 50;
569 	if (priv->et_coalesce.rx_max_coalesced_frames < 1)
570 		priv->et_coalesce.rx_max_coalesced_frames = 1;
571 
572 	netsec_write(priv, NETSEC_REG_NRM_RX_RXINT_PKTCNT,
573 		     priv->et_coalesce.rx_max_coalesced_frames);
574 	netsec_write(priv, NETSEC_REG_NRM_RX_RXINT_TMR,
575 		     priv->et_coalesce.rx_coalesce_usecs);
576 	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_SET, NRM_RX_ST_PKTCNT);
577 	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_SET, NRM_RX_ST_TMREXP);
578 
579 	return 0;
580 }
581 
582 static u32 netsec_et_get_msglevel(struct net_device *dev)
583 {
584 	struct netsec_priv *priv = netdev_priv(dev);
585 
586 	return priv->msg_enable;
587 }
588 
589 static void netsec_et_set_msglevel(struct net_device *dev, u32 datum)
590 {
591 	struct netsec_priv *priv = netdev_priv(dev);
592 
593 	priv->msg_enable = datum;
594 }
595 
596 static const struct ethtool_ops netsec_ethtool_ops = {
597 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
598 				     ETHTOOL_COALESCE_MAX_FRAMES,
599 	.get_drvinfo		= netsec_et_get_drvinfo,
600 	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
601 	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
602 	.get_link		= ethtool_op_get_link,
603 	.get_coalesce		= netsec_et_get_coalesce,
604 	.set_coalesce		= netsec_et_set_coalesce,
605 	.get_msglevel		= netsec_et_get_msglevel,
606 	.set_msglevel		= netsec_et_set_msglevel,
607 };
608 
609 /************* NETDEV_OPS FOLLOW *************/
610 
611 
612 static void netsec_set_rx_de(struct netsec_priv *priv,
613 			     struct netsec_desc_ring *dring, u16 idx,
614 			     const struct netsec_desc *desc)
615 {
616 	struct netsec_de *de = dring->vaddr + DESC_SZ * idx;
617 	u32 attr = (1 << NETSEC_RX_PKT_OWN_FIELD) |
618 		   (1 << NETSEC_RX_PKT_FS_FIELD) |
619 		   (1 << NETSEC_RX_PKT_LS_FIELD);
620 
621 	if (idx == DESC_NUM - 1)
622 		attr |= (1 << NETSEC_RX_PKT_LD_FIELD);
623 
624 	de->data_buf_addr_up = upper_32_bits(desc->dma_addr);
625 	de->data_buf_addr_lw = lower_32_bits(desc->dma_addr);
626 	de->buf_len_info = desc->len;
627 	de->attr = attr;
628 	dma_wmb();
629 
630 	dring->desc[idx].dma_addr = desc->dma_addr;
631 	dring->desc[idx].addr = desc->addr;
632 	dring->desc[idx].len = desc->len;
633 }
634 
635 static bool netsec_clean_tx_dring(struct netsec_priv *priv)
636 {
637 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
638 	struct xdp_frame_bulk bq;
639 	struct netsec_de *entry;
640 	int tail = dring->tail;
641 	unsigned int bytes;
642 	int cnt = 0;
643 
644 	spin_lock(&dring->lock);
645 
646 	bytes = 0;
647 	xdp_frame_bulk_init(&bq);
648 	entry = dring->vaddr + DESC_SZ * tail;
649 
650 	rcu_read_lock(); /* need for xdp_return_frame_bulk */
651 
652 	while (!(entry->attr & (1U << NETSEC_TX_SHIFT_OWN_FIELD)) &&
653 	       cnt < DESC_NUM) {
654 		struct netsec_desc *desc;
655 		int eop;
656 
657 		desc = &dring->desc[tail];
658 		eop = (entry->attr >> NETSEC_TX_LAST) & 1;
659 		dma_rmb();
660 
661 		/* if buf_type is either TYPE_NETSEC_SKB or
662 		 * TYPE_NETSEC_XDP_NDO we mapped it
663 		 */
664 		if (desc->buf_type != TYPE_NETSEC_XDP_TX)
665 			dma_unmap_single(priv->dev, desc->dma_addr, desc->len,
666 					 DMA_TO_DEVICE);
667 
668 		if (!eop)
669 			goto next;
670 
671 		if (desc->buf_type == TYPE_NETSEC_SKB) {
672 			bytes += desc->skb->len;
673 			dev_kfree_skb(desc->skb);
674 		} else {
675 			bytes += desc->xdpf->len;
676 			if (desc->buf_type == TYPE_NETSEC_XDP_TX)
677 				xdp_return_frame_rx_napi(desc->xdpf);
678 			else
679 				xdp_return_frame_bulk(desc->xdpf, &bq);
680 		}
681 next:
682 		/* clean up so netsec_uninit_pkt_dring() won't free the skb
683 		 * again
684 		 */
685 		*desc = (struct netsec_desc){};
686 
687 		/* entry->attr is not going to be accessed by the NIC until
688 		 * netsec_set_tx_de() is called. No need for a dma_wmb() here
689 		 */
690 		entry->attr = 1U << NETSEC_TX_SHIFT_OWN_FIELD;
691 		/* move tail ahead */
692 		dring->tail = (tail + 1) % DESC_NUM;
693 
694 		tail = dring->tail;
695 		entry = dring->vaddr + DESC_SZ * tail;
696 		cnt++;
697 	}
698 	xdp_flush_frame_bulk(&bq);
699 
700 	rcu_read_unlock();
701 
702 	spin_unlock(&dring->lock);
703 
704 	if (!cnt)
705 		return false;
706 
707 	/* reading the register clears the irq */
708 	netsec_read(priv, NETSEC_REG_NRM_TX_DONE_PKTCNT);
709 
710 	priv->ndev->stats.tx_packets += cnt;
711 	priv->ndev->stats.tx_bytes += bytes;
712 
713 	netdev_completed_queue(priv->ndev, cnt, bytes);
714 
715 	return true;
716 }
717 
718 static void netsec_process_tx(struct netsec_priv *priv)
719 {
720 	struct net_device *ndev = priv->ndev;
721 	bool cleaned;
722 
723 	cleaned = netsec_clean_tx_dring(priv);
724 
725 	if (cleaned && netif_queue_stopped(ndev)) {
726 		/* Make sure we update the value, anyone stopping the queue
727 		 * after this will read the proper consumer idx
728 		 */
729 		smp_wmb();
730 		netif_wake_queue(ndev);
731 	}
732 }
733 
734 static void *netsec_alloc_rx_data(struct netsec_priv *priv,
735 				  dma_addr_t *dma_handle, u16 *desc_len)
736 
737 {
738 
739 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
740 	struct page *page;
741 
742 	page = page_pool_dev_alloc_pages(dring->page_pool);
743 	if (!page)
744 		return NULL;
745 
746 	/* We allocate the same buffer length for XDP and non-XDP cases.
747 	 * page_pool API will map the whole page, skip what's needed for
748 	 * network payloads and/or XDP
749 	 */
750 	*dma_handle = page_pool_get_dma_addr(page) + NETSEC_RXBUF_HEADROOM;
751 	/* Make sure the incoming payload fits in the page for XDP and non-XDP
752 	 * cases and reserve enough space for headroom + skb_shared_info
753 	 */
754 	*desc_len = NETSEC_RX_BUF_SIZE;
755 
756 	return page_address(page);
757 }
758 
759 static void netsec_rx_fill(struct netsec_priv *priv, u16 from, u16 num)
760 {
761 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
762 	u16 idx = from;
763 
764 	while (num) {
765 		netsec_set_rx_de(priv, dring, idx, &dring->desc[idx]);
766 		idx++;
767 		if (idx >= DESC_NUM)
768 			idx = 0;
769 		num--;
770 	}
771 }
772 
773 static void netsec_xdp_ring_tx_db(struct netsec_priv *priv, u16 pkts)
774 {
775 	if (likely(pkts))
776 		netsec_write(priv, NETSEC_REG_NRM_TX_PKTCNT, pkts);
777 }
778 
779 static void netsec_finalize_xdp_rx(struct netsec_priv *priv, u32 xdp_res,
780 				   u16 pkts)
781 {
782 	if (xdp_res & NETSEC_XDP_REDIR)
783 		xdp_do_flush_map();
784 
785 	if (xdp_res & NETSEC_XDP_TX)
786 		netsec_xdp_ring_tx_db(priv, pkts);
787 }
788 
789 static void netsec_set_tx_de(struct netsec_priv *priv,
790 			     struct netsec_desc_ring *dring,
791 			     const struct netsec_tx_pkt_ctrl *tx_ctrl,
792 			     const struct netsec_desc *desc, void *buf)
793 {
794 	int idx = dring->head;
795 	struct netsec_de *de;
796 	u32 attr;
797 
798 	de = dring->vaddr + (DESC_SZ * idx);
799 
800 	attr = (1 << NETSEC_TX_SHIFT_OWN_FIELD) |
801 	       (1 << NETSEC_TX_SHIFT_PT_FIELD) |
802 	       (NETSEC_RING_GMAC << NETSEC_TX_SHIFT_TDRID_FIELD) |
803 	       (1 << NETSEC_TX_SHIFT_FS_FIELD) |
804 	       (1 << NETSEC_TX_LAST) |
805 	       (tx_ctrl->cksum_offload_flag << NETSEC_TX_SHIFT_CO) |
806 	       (tx_ctrl->tcp_seg_offload_flag << NETSEC_TX_SHIFT_SO) |
807 	       (1 << NETSEC_TX_SHIFT_TRS_FIELD);
808 	if (idx == DESC_NUM - 1)
809 		attr |= (1 << NETSEC_TX_SHIFT_LD_FIELD);
810 
811 	de->data_buf_addr_up = upper_32_bits(desc->dma_addr);
812 	de->data_buf_addr_lw = lower_32_bits(desc->dma_addr);
813 	de->buf_len_info = (tx_ctrl->tcp_seg_len << 16) | desc->len;
814 	de->attr = attr;
815 
816 	dring->desc[idx] = *desc;
817 	if (desc->buf_type == TYPE_NETSEC_SKB)
818 		dring->desc[idx].skb = buf;
819 	else if (desc->buf_type == TYPE_NETSEC_XDP_TX ||
820 		 desc->buf_type == TYPE_NETSEC_XDP_NDO)
821 		dring->desc[idx].xdpf = buf;
822 
823 	/* move head ahead */
824 	dring->head = (dring->head + 1) % DESC_NUM;
825 }
826 
827 /* The current driver only supports 1 Txq, this should run under spin_lock() */
828 static u32 netsec_xdp_queue_one(struct netsec_priv *priv,
829 				struct xdp_frame *xdpf, bool is_ndo)
830 
831 {
832 	struct netsec_desc_ring *tx_ring = &priv->desc_ring[NETSEC_RING_TX];
833 	struct page *page = virt_to_page(xdpf->data);
834 	struct netsec_tx_pkt_ctrl tx_ctrl = {};
835 	struct netsec_desc tx_desc;
836 	dma_addr_t dma_handle;
837 	u16 filled;
838 
839 	if (tx_ring->head >= tx_ring->tail)
840 		filled = tx_ring->head - tx_ring->tail;
841 	else
842 		filled = tx_ring->head + DESC_NUM - tx_ring->tail;
843 
844 	if (DESC_NUM - filled <= 1)
845 		return NETSEC_XDP_CONSUMED;
846 
847 	if (is_ndo) {
848 		/* this is for ndo_xdp_xmit, the buffer needs mapping before
849 		 * sending
850 		 */
851 		dma_handle = dma_map_single(priv->dev, xdpf->data, xdpf->len,
852 					    DMA_TO_DEVICE);
853 		if (dma_mapping_error(priv->dev, dma_handle))
854 			return NETSEC_XDP_CONSUMED;
855 		tx_desc.buf_type = TYPE_NETSEC_XDP_NDO;
856 	} else {
857 		/* This is the device Rx buffer from page_pool. No need to remap
858 		 * just sync and send it
859 		 */
860 		struct netsec_desc_ring *rx_ring =
861 			&priv->desc_ring[NETSEC_RING_RX];
862 		enum dma_data_direction dma_dir =
863 			page_pool_get_dma_dir(rx_ring->page_pool);
864 
865 		dma_handle = page_pool_get_dma_addr(page) + xdpf->headroom +
866 			sizeof(*xdpf);
867 		dma_sync_single_for_device(priv->dev, dma_handle, xdpf->len,
868 					   dma_dir);
869 		tx_desc.buf_type = TYPE_NETSEC_XDP_TX;
870 	}
871 
872 	tx_desc.dma_addr = dma_handle;
873 	tx_desc.addr = xdpf->data;
874 	tx_desc.len = xdpf->len;
875 
876 	netdev_sent_queue(priv->ndev, xdpf->len);
877 	netsec_set_tx_de(priv, tx_ring, &tx_ctrl, &tx_desc, xdpf);
878 
879 	return NETSEC_XDP_TX;
880 }
881 
882 static u32 netsec_xdp_xmit_back(struct netsec_priv *priv, struct xdp_buff *xdp)
883 {
884 	struct netsec_desc_ring *tx_ring = &priv->desc_ring[NETSEC_RING_TX];
885 	struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
886 	u32 ret;
887 
888 	if (unlikely(!xdpf))
889 		return NETSEC_XDP_CONSUMED;
890 
891 	spin_lock(&tx_ring->lock);
892 	ret = netsec_xdp_queue_one(priv, xdpf, false);
893 	spin_unlock(&tx_ring->lock);
894 
895 	return ret;
896 }
897 
898 static u32 netsec_run_xdp(struct netsec_priv *priv, struct bpf_prog *prog,
899 			  struct xdp_buff *xdp)
900 {
901 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
902 	unsigned int sync, len = xdp->data_end - xdp->data;
903 	u32 ret = NETSEC_XDP_PASS;
904 	struct page *page;
905 	int err;
906 	u32 act;
907 
908 	act = bpf_prog_run_xdp(prog, xdp);
909 
910 	/* Due xdp_adjust_tail: DMA sync for_device cover max len CPU touch */
911 	sync = xdp->data_end - xdp->data_hard_start - NETSEC_RXBUF_HEADROOM;
912 	sync = max(sync, len);
913 
914 	switch (act) {
915 	case XDP_PASS:
916 		ret = NETSEC_XDP_PASS;
917 		break;
918 	case XDP_TX:
919 		ret = netsec_xdp_xmit_back(priv, xdp);
920 		if (ret != NETSEC_XDP_TX) {
921 			page = virt_to_head_page(xdp->data);
922 			page_pool_put_page(dring->page_pool, page, sync, true);
923 		}
924 		break;
925 	case XDP_REDIRECT:
926 		err = xdp_do_redirect(priv->ndev, xdp, prog);
927 		if (!err) {
928 			ret = NETSEC_XDP_REDIR;
929 		} else {
930 			ret = NETSEC_XDP_CONSUMED;
931 			page = virt_to_head_page(xdp->data);
932 			page_pool_put_page(dring->page_pool, page, sync, true);
933 		}
934 		break;
935 	default:
936 		bpf_warn_invalid_xdp_action(priv->ndev, prog, act);
937 		fallthrough;
938 	case XDP_ABORTED:
939 		trace_xdp_exception(priv->ndev, prog, act);
940 		fallthrough;	/* handle aborts by dropping packet */
941 	case XDP_DROP:
942 		ret = NETSEC_XDP_CONSUMED;
943 		page = virt_to_head_page(xdp->data);
944 		page_pool_put_page(dring->page_pool, page, sync, true);
945 		break;
946 	}
947 
948 	return ret;
949 }
950 
951 static int netsec_process_rx(struct netsec_priv *priv, int budget)
952 {
953 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
954 	struct net_device *ndev = priv->ndev;
955 	struct netsec_rx_pkt_info rx_info;
956 	enum dma_data_direction dma_dir;
957 	struct bpf_prog *xdp_prog;
958 	struct xdp_buff xdp;
959 	u16 xdp_xmit = 0;
960 	u32 xdp_act = 0;
961 	int done = 0;
962 
963 	xdp_init_buff(&xdp, PAGE_SIZE, &dring->xdp_rxq);
964 
965 	xdp_prog = READ_ONCE(priv->xdp_prog);
966 	dma_dir = page_pool_get_dma_dir(dring->page_pool);
967 
968 	while (done < budget) {
969 		u16 idx = dring->tail;
970 		struct netsec_de *de = dring->vaddr + (DESC_SZ * idx);
971 		struct netsec_desc *desc = &dring->desc[idx];
972 		struct page *page = virt_to_page(desc->addr);
973 		u32 xdp_result = NETSEC_XDP_PASS;
974 		struct sk_buff *skb = NULL;
975 		u16 pkt_len, desc_len;
976 		dma_addr_t dma_handle;
977 		void *buf_addr;
978 
979 		if (de->attr & (1U << NETSEC_RX_PKT_OWN_FIELD)) {
980 			/* reading the register clears the irq */
981 			netsec_read(priv, NETSEC_REG_NRM_RX_PKTCNT);
982 			break;
983 		}
984 
985 		/* This  barrier is needed to keep us from reading
986 		 * any other fields out of the netsec_de until we have
987 		 * verified the descriptor has been written back
988 		 */
989 		dma_rmb();
990 		done++;
991 
992 		pkt_len = de->buf_len_info >> 16;
993 		rx_info.err_code = (de->attr >> NETSEC_RX_PKT_ERR_FIELD) &
994 			NETSEC_RX_PKT_ERR_MASK;
995 		rx_info.err_flag = (de->attr >> NETSEC_RX_PKT_ER_FIELD) & 1;
996 		if (rx_info.err_flag) {
997 			netif_err(priv, drv, priv->ndev,
998 				  "%s: rx fail err(%d)\n", __func__,
999 				  rx_info.err_code);
1000 			ndev->stats.rx_dropped++;
1001 			dring->tail = (dring->tail + 1) % DESC_NUM;
1002 			/* reuse buffer page frag */
1003 			netsec_rx_fill(priv, idx, 1);
1004 			continue;
1005 		}
1006 		rx_info.rx_cksum_result =
1007 			(de->attr >> NETSEC_RX_PKT_CO_FIELD) & 3;
1008 
1009 		/* allocate a fresh buffer and map it to the hardware.
1010 		 * This will eventually replace the old buffer in the hardware
1011 		 */
1012 		buf_addr = netsec_alloc_rx_data(priv, &dma_handle, &desc_len);
1013 
1014 		if (unlikely(!buf_addr))
1015 			break;
1016 
1017 		dma_sync_single_for_cpu(priv->dev, desc->dma_addr, pkt_len,
1018 					dma_dir);
1019 		prefetch(desc->addr);
1020 
1021 		xdp_prepare_buff(&xdp, desc->addr, NETSEC_RXBUF_HEADROOM,
1022 				 pkt_len, false);
1023 
1024 		if (xdp_prog) {
1025 			xdp_result = netsec_run_xdp(priv, xdp_prog, &xdp);
1026 			if (xdp_result != NETSEC_XDP_PASS) {
1027 				xdp_act |= xdp_result;
1028 				if (xdp_result == NETSEC_XDP_TX)
1029 					xdp_xmit++;
1030 				goto next;
1031 			}
1032 		}
1033 		skb = build_skb(desc->addr, desc->len + NETSEC_RX_BUF_NON_DATA);
1034 
1035 		if (unlikely(!skb)) {
1036 			/* If skb fails recycle_direct will either unmap and
1037 			 * free the page or refill the cache depending on the
1038 			 * cache state. Since we paid the allocation cost if
1039 			 * building an skb fails try to put the page into cache
1040 			 */
1041 			page_pool_put_page(dring->page_pool, page, pkt_len,
1042 					   true);
1043 			netif_err(priv, drv, priv->ndev,
1044 				  "rx failed to build skb\n");
1045 			break;
1046 		}
1047 		skb_mark_for_recycle(skb);
1048 
1049 		skb_reserve(skb, xdp.data - xdp.data_hard_start);
1050 		skb_put(skb, xdp.data_end - xdp.data);
1051 		skb->protocol = eth_type_trans(skb, priv->ndev);
1052 
1053 		if (priv->rx_cksum_offload_flag &&
1054 		    rx_info.rx_cksum_result == NETSEC_RX_CKSUM_OK)
1055 			skb->ip_summed = CHECKSUM_UNNECESSARY;
1056 
1057 next:
1058 		if (skb)
1059 			napi_gro_receive(&priv->napi, skb);
1060 		if (skb || xdp_result) {
1061 			ndev->stats.rx_packets++;
1062 			ndev->stats.rx_bytes += xdp.data_end - xdp.data;
1063 		}
1064 
1065 		/* Update the descriptor with fresh buffers */
1066 		desc->len = desc_len;
1067 		desc->dma_addr = dma_handle;
1068 		desc->addr = buf_addr;
1069 
1070 		netsec_rx_fill(priv, idx, 1);
1071 		dring->tail = (dring->tail + 1) % DESC_NUM;
1072 	}
1073 	netsec_finalize_xdp_rx(priv, xdp_act, xdp_xmit);
1074 
1075 	return done;
1076 }
1077 
1078 static int netsec_napi_poll(struct napi_struct *napi, int budget)
1079 {
1080 	struct netsec_priv *priv;
1081 	int done;
1082 
1083 	priv = container_of(napi, struct netsec_priv, napi);
1084 
1085 	netsec_process_tx(priv);
1086 	done = netsec_process_rx(priv, budget);
1087 
1088 	if (done < budget && napi_complete_done(napi, done)) {
1089 		unsigned long flags;
1090 
1091 		spin_lock_irqsave(&priv->reglock, flags);
1092 		netsec_write(priv, NETSEC_REG_INTEN_SET,
1093 			     NETSEC_IRQ_RX | NETSEC_IRQ_TX);
1094 		spin_unlock_irqrestore(&priv->reglock, flags);
1095 	}
1096 
1097 	return done;
1098 }
1099 
1100 
1101 static int netsec_desc_used(struct netsec_desc_ring *dring)
1102 {
1103 	int used;
1104 
1105 	if (dring->head >= dring->tail)
1106 		used = dring->head - dring->tail;
1107 	else
1108 		used = dring->head + DESC_NUM - dring->tail;
1109 
1110 	return used;
1111 }
1112 
1113 static int netsec_check_stop_tx(struct netsec_priv *priv, int used)
1114 {
1115 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
1116 
1117 	/* keep tail from touching the queue */
1118 	if (DESC_NUM - used < 2) {
1119 		netif_stop_queue(priv->ndev);
1120 
1121 		/* Make sure we read the updated value in case
1122 		 * descriptors got freed
1123 		 */
1124 		smp_rmb();
1125 
1126 		used = netsec_desc_used(dring);
1127 		if (DESC_NUM - used < 2)
1128 			return NETDEV_TX_BUSY;
1129 
1130 		netif_wake_queue(priv->ndev);
1131 	}
1132 
1133 	return 0;
1134 }
1135 
1136 static netdev_tx_t netsec_netdev_start_xmit(struct sk_buff *skb,
1137 					    struct net_device *ndev)
1138 {
1139 	struct netsec_priv *priv = netdev_priv(ndev);
1140 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
1141 	struct netsec_tx_pkt_ctrl tx_ctrl = {};
1142 	struct netsec_desc tx_desc;
1143 	u16 tso_seg_len = 0;
1144 	int filled;
1145 
1146 	spin_lock_bh(&dring->lock);
1147 	filled = netsec_desc_used(dring);
1148 	if (netsec_check_stop_tx(priv, filled)) {
1149 		spin_unlock_bh(&dring->lock);
1150 		net_warn_ratelimited("%s %s Tx queue full\n",
1151 				     dev_name(priv->dev), ndev->name);
1152 		return NETDEV_TX_BUSY;
1153 	}
1154 
1155 	if (skb->ip_summed == CHECKSUM_PARTIAL)
1156 		tx_ctrl.cksum_offload_flag = true;
1157 
1158 	if (skb_is_gso(skb))
1159 		tso_seg_len = skb_shinfo(skb)->gso_size;
1160 
1161 	if (tso_seg_len > 0) {
1162 		if (skb->protocol == htons(ETH_P_IP)) {
1163 			ip_hdr(skb)->tot_len = 0;
1164 			tcp_hdr(skb)->check =
1165 				~tcp_v4_check(0, ip_hdr(skb)->saddr,
1166 					      ip_hdr(skb)->daddr, 0);
1167 		} else {
1168 			tcp_v6_gso_csum_prep(skb);
1169 		}
1170 
1171 		tx_ctrl.tcp_seg_offload_flag = true;
1172 		tx_ctrl.tcp_seg_len = tso_seg_len;
1173 	}
1174 
1175 	tx_desc.dma_addr = dma_map_single(priv->dev, skb->data,
1176 					  skb_headlen(skb), DMA_TO_DEVICE);
1177 	if (dma_mapping_error(priv->dev, tx_desc.dma_addr)) {
1178 		spin_unlock_bh(&dring->lock);
1179 		netif_err(priv, drv, priv->ndev,
1180 			  "%s: DMA mapping failed\n", __func__);
1181 		ndev->stats.tx_dropped++;
1182 		dev_kfree_skb_any(skb);
1183 		return NETDEV_TX_OK;
1184 	}
1185 	tx_desc.addr = skb->data;
1186 	tx_desc.len = skb_headlen(skb);
1187 	tx_desc.buf_type = TYPE_NETSEC_SKB;
1188 
1189 	skb_tx_timestamp(skb);
1190 	netdev_sent_queue(priv->ndev, skb->len);
1191 
1192 	netsec_set_tx_de(priv, dring, &tx_ctrl, &tx_desc, skb);
1193 	spin_unlock_bh(&dring->lock);
1194 	netsec_write(priv, NETSEC_REG_NRM_TX_PKTCNT, 1); /* submit another tx */
1195 
1196 	return NETDEV_TX_OK;
1197 }
1198 
1199 static void netsec_uninit_pkt_dring(struct netsec_priv *priv, int id)
1200 {
1201 	struct netsec_desc_ring *dring = &priv->desc_ring[id];
1202 	struct netsec_desc *desc;
1203 	u16 idx;
1204 
1205 	if (!dring->vaddr || !dring->desc)
1206 		return;
1207 	for (idx = 0; idx < DESC_NUM; idx++) {
1208 		desc = &dring->desc[idx];
1209 		if (!desc->addr)
1210 			continue;
1211 
1212 		if (id == NETSEC_RING_RX) {
1213 			struct page *page = virt_to_page(desc->addr);
1214 
1215 			page_pool_put_full_page(dring->page_pool, page, false);
1216 		} else if (id == NETSEC_RING_TX) {
1217 			dma_unmap_single(priv->dev, desc->dma_addr, desc->len,
1218 					 DMA_TO_DEVICE);
1219 			dev_kfree_skb(desc->skb);
1220 		}
1221 	}
1222 
1223 	/* Rx is currently using page_pool */
1224 	if (id == NETSEC_RING_RX) {
1225 		if (xdp_rxq_info_is_reg(&dring->xdp_rxq))
1226 			xdp_rxq_info_unreg(&dring->xdp_rxq);
1227 		page_pool_destroy(dring->page_pool);
1228 	}
1229 
1230 	memset(dring->desc, 0, sizeof(struct netsec_desc) * DESC_NUM);
1231 	memset(dring->vaddr, 0, DESC_SZ * DESC_NUM);
1232 
1233 	dring->head = 0;
1234 	dring->tail = 0;
1235 
1236 	if (id == NETSEC_RING_TX)
1237 		netdev_reset_queue(priv->ndev);
1238 }
1239 
1240 static void netsec_free_dring(struct netsec_priv *priv, int id)
1241 {
1242 	struct netsec_desc_ring *dring = &priv->desc_ring[id];
1243 
1244 	if (dring->vaddr) {
1245 		dma_free_coherent(priv->dev, DESC_SZ * DESC_NUM,
1246 				  dring->vaddr, dring->desc_dma);
1247 		dring->vaddr = NULL;
1248 	}
1249 
1250 	kfree(dring->desc);
1251 	dring->desc = NULL;
1252 }
1253 
1254 static int netsec_alloc_dring(struct netsec_priv *priv, enum ring_id id)
1255 {
1256 	struct netsec_desc_ring *dring = &priv->desc_ring[id];
1257 
1258 	dring->vaddr = dma_alloc_coherent(priv->dev, DESC_SZ * DESC_NUM,
1259 					  &dring->desc_dma, GFP_KERNEL);
1260 	if (!dring->vaddr)
1261 		goto err;
1262 
1263 	dring->desc = kcalloc(DESC_NUM, sizeof(*dring->desc), GFP_KERNEL);
1264 	if (!dring->desc)
1265 		goto err;
1266 
1267 	return 0;
1268 err:
1269 	netsec_free_dring(priv, id);
1270 
1271 	return -ENOMEM;
1272 }
1273 
1274 static void netsec_setup_tx_dring(struct netsec_priv *priv)
1275 {
1276 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
1277 	int i;
1278 
1279 	for (i = 0; i < DESC_NUM; i++) {
1280 		struct netsec_de *de;
1281 
1282 		de = dring->vaddr + (DESC_SZ * i);
1283 		/* de->attr is not going to be accessed by the NIC
1284 		 * until netsec_set_tx_de() is called.
1285 		 * No need for a dma_wmb() here
1286 		 */
1287 		de->attr = 1U << NETSEC_TX_SHIFT_OWN_FIELD;
1288 	}
1289 }
1290 
1291 static int netsec_setup_rx_dring(struct netsec_priv *priv)
1292 {
1293 	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
1294 	struct bpf_prog *xdp_prog = READ_ONCE(priv->xdp_prog);
1295 	struct page_pool_params pp_params = {
1296 		.order = 0,
1297 		/* internal DMA mapping in page_pool */
1298 		.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
1299 		.pool_size = DESC_NUM,
1300 		.nid = NUMA_NO_NODE,
1301 		.dev = priv->dev,
1302 		.dma_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE,
1303 		.offset = NETSEC_RXBUF_HEADROOM,
1304 		.max_len = NETSEC_RX_BUF_SIZE,
1305 	};
1306 	int i, err;
1307 
1308 	dring->page_pool = page_pool_create(&pp_params);
1309 	if (IS_ERR(dring->page_pool)) {
1310 		err = PTR_ERR(dring->page_pool);
1311 		dring->page_pool = NULL;
1312 		goto err_out;
1313 	}
1314 
1315 	err = xdp_rxq_info_reg(&dring->xdp_rxq, priv->ndev, 0, priv->napi.napi_id);
1316 	if (err)
1317 		goto err_out;
1318 
1319 	err = xdp_rxq_info_reg_mem_model(&dring->xdp_rxq, MEM_TYPE_PAGE_POOL,
1320 					 dring->page_pool);
1321 	if (err)
1322 		goto err_out;
1323 
1324 	for (i = 0; i < DESC_NUM; i++) {
1325 		struct netsec_desc *desc = &dring->desc[i];
1326 		dma_addr_t dma_handle;
1327 		void *buf;
1328 		u16 len;
1329 
1330 		buf = netsec_alloc_rx_data(priv, &dma_handle, &len);
1331 
1332 		if (!buf) {
1333 			err = -ENOMEM;
1334 			goto err_out;
1335 		}
1336 		desc->dma_addr = dma_handle;
1337 		desc->addr = buf;
1338 		desc->len = len;
1339 	}
1340 
1341 	netsec_rx_fill(priv, 0, DESC_NUM);
1342 
1343 	return 0;
1344 
1345 err_out:
1346 	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
1347 	return err;
1348 }
1349 
1350 static int netsec_netdev_load_ucode_region(struct netsec_priv *priv, u32 reg,
1351 					   u32 addr_h, u32 addr_l, u32 size)
1352 {
1353 	u64 base = (u64)addr_h << 32 | addr_l;
1354 	void __iomem *ucode;
1355 	u32 i;
1356 
1357 	ucode = ioremap(base, size * sizeof(u32));
1358 	if (!ucode)
1359 		return -ENOMEM;
1360 
1361 	for (i = 0; i < size; i++)
1362 		netsec_write(priv, reg, readl(ucode + i * 4));
1363 
1364 	iounmap(ucode);
1365 	return 0;
1366 }
1367 
1368 static int netsec_netdev_load_microcode(struct netsec_priv *priv)
1369 {
1370 	u32 addr_h, addr_l, size;
1371 	int err;
1372 
1373 	addr_h = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_ADDRESS_H);
1374 	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_ADDRESS_L);
1375 	size = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_SIZE);
1376 	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_DMAC_HM_CMD_BUF,
1377 					      addr_h, addr_l, size);
1378 	if (err)
1379 		return err;
1380 
1381 	addr_h = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_ADDRESS_H);
1382 	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_ADDRESS_L);
1383 	size = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_SIZE);
1384 	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_DMAC_MH_CMD_BUF,
1385 					      addr_h, addr_l, size);
1386 	if (err)
1387 		return err;
1388 
1389 	addr_h = 0;
1390 	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_PKT_ME_ADDRESS);
1391 	size = readl(priv->eeprom_base + NETSEC_EEPROM_PKT_ME_SIZE);
1392 	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_PKT_CMD_BUF,
1393 					      addr_h, addr_l, size);
1394 	if (err)
1395 		return err;
1396 
1397 	return 0;
1398 }
1399 
1400 static int netsec_reset_hardware(struct netsec_priv *priv,
1401 				 bool load_ucode)
1402 {
1403 	u32 value;
1404 	int err;
1405 
1406 	/* stop DMA engines */
1407 	if (!netsec_read(priv, NETSEC_REG_ADDR_DIS_CORE)) {
1408 		netsec_write(priv, NETSEC_REG_DMA_HM_CTRL,
1409 			     NETSEC_DMA_CTRL_REG_STOP);
1410 		netsec_write(priv, NETSEC_REG_DMA_MH_CTRL,
1411 			     NETSEC_DMA_CTRL_REG_STOP);
1412 
1413 		while (netsec_read(priv, NETSEC_REG_DMA_HM_CTRL) &
1414 		       NETSEC_DMA_CTRL_REG_STOP)
1415 			cpu_relax();
1416 
1417 		while (netsec_read(priv, NETSEC_REG_DMA_MH_CTRL) &
1418 		       NETSEC_DMA_CTRL_REG_STOP)
1419 			cpu_relax();
1420 	}
1421 
1422 	netsec_write(priv, NETSEC_REG_SOFT_RST, NETSEC_SOFT_RST_REG_RESET);
1423 	netsec_write(priv, NETSEC_REG_SOFT_RST, NETSEC_SOFT_RST_REG_RUN);
1424 	netsec_write(priv, NETSEC_REG_COM_INIT, NETSEC_COM_INIT_REG_ALL);
1425 
1426 	while (netsec_read(priv, NETSEC_REG_COM_INIT) != 0)
1427 		cpu_relax();
1428 
1429 	/* set desc_start addr */
1430 	netsec_write(priv, NETSEC_REG_NRM_RX_DESC_START_UP,
1431 		     upper_32_bits(priv->desc_ring[NETSEC_RING_RX].desc_dma));
1432 	netsec_write(priv, NETSEC_REG_NRM_RX_DESC_START_LW,
1433 		     lower_32_bits(priv->desc_ring[NETSEC_RING_RX].desc_dma));
1434 
1435 	netsec_write(priv, NETSEC_REG_NRM_TX_DESC_START_UP,
1436 		     upper_32_bits(priv->desc_ring[NETSEC_RING_TX].desc_dma));
1437 	netsec_write(priv, NETSEC_REG_NRM_TX_DESC_START_LW,
1438 		     lower_32_bits(priv->desc_ring[NETSEC_RING_TX].desc_dma));
1439 
1440 	/* set normal tx dring ring config */
1441 	netsec_write(priv, NETSEC_REG_NRM_TX_CONFIG,
1442 		     1 << NETSEC_REG_DESC_ENDIAN);
1443 	netsec_write(priv, NETSEC_REG_NRM_RX_CONFIG,
1444 		     1 << NETSEC_REG_DESC_ENDIAN);
1445 
1446 	if (load_ucode) {
1447 		err = netsec_netdev_load_microcode(priv);
1448 		if (err) {
1449 			netif_err(priv, probe, priv->ndev,
1450 				  "%s: failed to load microcode (%d)\n",
1451 				  __func__, err);
1452 			return err;
1453 		}
1454 	}
1455 
1456 	/* start DMA engines */
1457 	netsec_write(priv, NETSEC_REG_DMA_TMR_CTRL, priv->freq / 1000000 - 1);
1458 	netsec_write(priv, NETSEC_REG_ADDR_DIS_CORE, 0);
1459 
1460 	usleep_range(1000, 2000);
1461 
1462 	if (!(netsec_read(priv, NETSEC_REG_TOP_STATUS) &
1463 	      NETSEC_TOP_IRQ_REG_CODE_LOAD_END)) {
1464 		netif_err(priv, probe, priv->ndev,
1465 			  "microengine start failed\n");
1466 		return -ENXIO;
1467 	}
1468 	netsec_write(priv, NETSEC_REG_TOP_STATUS,
1469 		     NETSEC_TOP_IRQ_REG_CODE_LOAD_END);
1470 
1471 	value = NETSEC_PKT_CTRL_REG_MODE_NRM;
1472 	if (priv->ndev->mtu > ETH_DATA_LEN)
1473 		value |= NETSEC_PKT_CTRL_REG_EN_JUMBO;
1474 
1475 	/* change to normal mode */
1476 	netsec_write(priv, NETSEC_REG_DMA_MH_CTRL, MH_CTRL__MODE_TRANS);
1477 	netsec_write(priv, NETSEC_REG_PKT_CTRL, value);
1478 
1479 	while ((netsec_read(priv, NETSEC_REG_MODE_TRANS_COMP_STATUS) &
1480 		NETSEC_MODE_TRANS_COMP_IRQ_T2N) == 0)
1481 		cpu_relax();
1482 
1483 	/* clear any pending EMPTY/ERR irq status */
1484 	netsec_write(priv, NETSEC_REG_NRM_TX_STATUS, ~0);
1485 
1486 	/* Disable TX & RX intr */
1487 	netsec_write(priv, NETSEC_REG_INTEN_CLR, ~0);
1488 
1489 	return 0;
1490 }
1491 
1492 static int netsec_start_gmac(struct netsec_priv *priv)
1493 {
1494 	struct phy_device *phydev = priv->ndev->phydev;
1495 	u32 value = 0;
1496 	int ret;
1497 
1498 	if (phydev->speed != SPEED_1000)
1499 		value = (NETSEC_GMAC_MCR_REG_CST |
1500 			 NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON);
1501 
1502 	if (netsec_mac_write(priv, GMAC_REG_MCR, value))
1503 		return -ETIMEDOUT;
1504 	if (netsec_mac_write(priv, GMAC_REG_BMR,
1505 			     NETSEC_GMAC_BMR_REG_RESET))
1506 		return -ETIMEDOUT;
1507 
1508 	/* Wait soft reset */
1509 	usleep_range(1000, 5000);
1510 
1511 	ret = netsec_mac_read(priv, GMAC_REG_BMR, &value);
1512 	if (ret)
1513 		return ret;
1514 	if (value & NETSEC_GMAC_BMR_REG_SWR)
1515 		return -EAGAIN;
1516 
1517 	netsec_write(priv, MAC_REG_DESC_SOFT_RST, 1);
1518 	if (netsec_wait_while_busy(priv, MAC_REG_DESC_SOFT_RST, 1))
1519 		return -ETIMEDOUT;
1520 
1521 	netsec_write(priv, MAC_REG_DESC_INIT, 1);
1522 	if (netsec_wait_while_busy(priv, MAC_REG_DESC_INIT, 1))
1523 		return -ETIMEDOUT;
1524 
1525 	if (netsec_mac_write(priv, GMAC_REG_BMR,
1526 			     NETSEC_GMAC_BMR_REG_COMMON))
1527 		return -ETIMEDOUT;
1528 	if (netsec_mac_write(priv, GMAC_REG_RDLAR,
1529 			     NETSEC_GMAC_RDLAR_REG_COMMON))
1530 		return -ETIMEDOUT;
1531 	if (netsec_mac_write(priv, GMAC_REG_TDLAR,
1532 			     NETSEC_GMAC_TDLAR_REG_COMMON))
1533 		return -ETIMEDOUT;
1534 	if (netsec_mac_write(priv, GMAC_REG_MFFR, 0x80000001))
1535 		return -ETIMEDOUT;
1536 
1537 	ret = netsec_mac_update_to_phy_state(priv);
1538 	if (ret)
1539 		return ret;
1540 
1541 	ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
1542 	if (ret)
1543 		return ret;
1544 
1545 	value |= NETSEC_GMAC_OMR_REG_SR;
1546 	value |= NETSEC_GMAC_OMR_REG_ST;
1547 
1548 	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_CLR, ~0);
1549 	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_CLR, ~0);
1550 
1551 	netsec_et_set_coalesce(priv->ndev, &priv->et_coalesce, NULL, NULL);
1552 
1553 	if (netsec_mac_write(priv, GMAC_REG_OMR, value))
1554 		return -ETIMEDOUT;
1555 
1556 	return 0;
1557 }
1558 
1559 static int netsec_stop_gmac(struct netsec_priv *priv)
1560 {
1561 	u32 value;
1562 	int ret;
1563 
1564 	ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
1565 	if (ret)
1566 		return ret;
1567 	value &= ~NETSEC_GMAC_OMR_REG_SR;
1568 	value &= ~NETSEC_GMAC_OMR_REG_ST;
1569 
1570 	/* disable all interrupts */
1571 	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_CLR, ~0);
1572 	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_CLR, ~0);
1573 
1574 	return netsec_mac_write(priv, GMAC_REG_OMR, value);
1575 }
1576 
1577 static void netsec_phy_adjust_link(struct net_device *ndev)
1578 {
1579 	struct netsec_priv *priv = netdev_priv(ndev);
1580 
1581 	if (ndev->phydev->link)
1582 		netsec_start_gmac(priv);
1583 	else
1584 		netsec_stop_gmac(priv);
1585 
1586 	phy_print_status(ndev->phydev);
1587 }
1588 
1589 static irqreturn_t netsec_irq_handler(int irq, void *dev_id)
1590 {
1591 	struct netsec_priv *priv = dev_id;
1592 	u32 val, status = netsec_read(priv, NETSEC_REG_TOP_STATUS);
1593 	unsigned long flags;
1594 
1595 	/* Disable interrupts */
1596 	if (status & NETSEC_IRQ_TX) {
1597 		val = netsec_read(priv, NETSEC_REG_NRM_TX_STATUS);
1598 		netsec_write(priv, NETSEC_REG_NRM_TX_STATUS, val);
1599 	}
1600 	if (status & NETSEC_IRQ_RX) {
1601 		val = netsec_read(priv, NETSEC_REG_NRM_RX_STATUS);
1602 		netsec_write(priv, NETSEC_REG_NRM_RX_STATUS, val);
1603 	}
1604 
1605 	spin_lock_irqsave(&priv->reglock, flags);
1606 	netsec_write(priv, NETSEC_REG_INTEN_CLR, NETSEC_IRQ_RX | NETSEC_IRQ_TX);
1607 	spin_unlock_irqrestore(&priv->reglock, flags);
1608 
1609 	napi_schedule(&priv->napi);
1610 
1611 	return IRQ_HANDLED;
1612 }
1613 
1614 static int netsec_netdev_open(struct net_device *ndev)
1615 {
1616 	struct netsec_priv *priv = netdev_priv(ndev);
1617 	int ret;
1618 
1619 	pm_runtime_get_sync(priv->dev);
1620 
1621 	netsec_setup_tx_dring(priv);
1622 	ret = netsec_setup_rx_dring(priv);
1623 	if (ret) {
1624 		netif_err(priv, probe, priv->ndev,
1625 			  "%s: fail setup ring\n", __func__);
1626 		goto err1;
1627 	}
1628 
1629 	ret = request_irq(priv->ndev->irq, netsec_irq_handler,
1630 			  IRQF_SHARED, "netsec", priv);
1631 	if (ret) {
1632 		netif_err(priv, drv, priv->ndev, "request_irq failed\n");
1633 		goto err2;
1634 	}
1635 
1636 	if (dev_of_node(priv->dev)) {
1637 		if (!of_phy_connect(priv->ndev, priv->phy_np,
1638 				    netsec_phy_adjust_link, 0,
1639 				    priv->phy_interface)) {
1640 			netif_err(priv, link, priv->ndev, "missing PHY\n");
1641 			ret = -ENODEV;
1642 			goto err3;
1643 		}
1644 	} else {
1645 		ret = phy_connect_direct(priv->ndev, priv->phydev,
1646 					 netsec_phy_adjust_link,
1647 					 priv->phy_interface);
1648 		if (ret) {
1649 			netif_err(priv, link, priv->ndev,
1650 				  "phy_connect_direct() failed (%d)\n", ret);
1651 			goto err3;
1652 		}
1653 	}
1654 
1655 	phy_start(ndev->phydev);
1656 
1657 	netsec_start_gmac(priv);
1658 	napi_enable(&priv->napi);
1659 	netif_start_queue(ndev);
1660 
1661 	/* Enable TX+RX intr. */
1662 	netsec_write(priv, NETSEC_REG_INTEN_SET, NETSEC_IRQ_RX | NETSEC_IRQ_TX);
1663 
1664 	return 0;
1665 err3:
1666 	free_irq(priv->ndev->irq, priv);
1667 err2:
1668 	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
1669 err1:
1670 	pm_runtime_put_sync(priv->dev);
1671 	return ret;
1672 }
1673 
1674 static int netsec_netdev_stop(struct net_device *ndev)
1675 {
1676 	int ret;
1677 	struct netsec_priv *priv = netdev_priv(ndev);
1678 
1679 	netif_stop_queue(priv->ndev);
1680 	dma_wmb();
1681 
1682 	napi_disable(&priv->napi);
1683 
1684 	netsec_write(priv, NETSEC_REG_INTEN_CLR, ~0);
1685 	netsec_stop_gmac(priv);
1686 
1687 	free_irq(priv->ndev->irq, priv);
1688 
1689 	netsec_uninit_pkt_dring(priv, NETSEC_RING_TX);
1690 	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
1691 
1692 	phy_stop(ndev->phydev);
1693 	phy_disconnect(ndev->phydev);
1694 
1695 	ret = netsec_reset_hardware(priv, false);
1696 
1697 	pm_runtime_put_sync(priv->dev);
1698 
1699 	return ret;
1700 }
1701 
1702 static int netsec_netdev_init(struct net_device *ndev)
1703 {
1704 	struct netsec_priv *priv = netdev_priv(ndev);
1705 	int ret;
1706 	u16 data;
1707 
1708 	BUILD_BUG_ON_NOT_POWER_OF_2(DESC_NUM);
1709 
1710 	ret = netsec_alloc_dring(priv, NETSEC_RING_TX);
1711 	if (ret)
1712 		return ret;
1713 
1714 	ret = netsec_alloc_dring(priv, NETSEC_RING_RX);
1715 	if (ret)
1716 		goto err1;
1717 
1718 	/* set phy power down */
1719 	data = netsec_phy_read(priv->mii_bus, priv->phy_addr, MII_BMCR);
1720 	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR,
1721 			 data | BMCR_PDOWN);
1722 
1723 	ret = netsec_reset_hardware(priv, true);
1724 	if (ret)
1725 		goto err2;
1726 
1727 	/* Restore phy power state */
1728 	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR, data);
1729 
1730 	spin_lock_init(&priv->desc_ring[NETSEC_RING_TX].lock);
1731 	spin_lock_init(&priv->desc_ring[NETSEC_RING_RX].lock);
1732 
1733 	return 0;
1734 err2:
1735 	netsec_free_dring(priv, NETSEC_RING_RX);
1736 err1:
1737 	netsec_free_dring(priv, NETSEC_RING_TX);
1738 	return ret;
1739 }
1740 
1741 static void netsec_netdev_uninit(struct net_device *ndev)
1742 {
1743 	struct netsec_priv *priv = netdev_priv(ndev);
1744 
1745 	netsec_free_dring(priv, NETSEC_RING_RX);
1746 	netsec_free_dring(priv, NETSEC_RING_TX);
1747 }
1748 
1749 static int netsec_netdev_set_features(struct net_device *ndev,
1750 				      netdev_features_t features)
1751 {
1752 	struct netsec_priv *priv = netdev_priv(ndev);
1753 
1754 	priv->rx_cksum_offload_flag = !!(features & NETIF_F_RXCSUM);
1755 
1756 	return 0;
1757 }
1758 
1759 static int netsec_xdp_xmit(struct net_device *ndev, int n,
1760 			   struct xdp_frame **frames, u32 flags)
1761 {
1762 	struct netsec_priv *priv = netdev_priv(ndev);
1763 	struct netsec_desc_ring *tx_ring = &priv->desc_ring[NETSEC_RING_TX];
1764 	int i, nxmit = 0;
1765 
1766 	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
1767 		return -EINVAL;
1768 
1769 	spin_lock(&tx_ring->lock);
1770 	for (i = 0; i < n; i++) {
1771 		struct xdp_frame *xdpf = frames[i];
1772 		int err;
1773 
1774 		err = netsec_xdp_queue_one(priv, xdpf, true);
1775 		if (err != NETSEC_XDP_TX)
1776 			break;
1777 
1778 		tx_ring->xdp_xmit++;
1779 		nxmit++;
1780 	}
1781 	spin_unlock(&tx_ring->lock);
1782 
1783 	if (unlikely(flags & XDP_XMIT_FLUSH)) {
1784 		netsec_xdp_ring_tx_db(priv, tx_ring->xdp_xmit);
1785 		tx_ring->xdp_xmit = 0;
1786 	}
1787 
1788 	return nxmit;
1789 }
1790 
1791 static int netsec_xdp_setup(struct netsec_priv *priv, struct bpf_prog *prog,
1792 			    struct netlink_ext_ack *extack)
1793 {
1794 	struct net_device *dev = priv->ndev;
1795 	struct bpf_prog *old_prog;
1796 
1797 	/* For now just support only the usual MTU sized frames */
1798 	if (prog && dev->mtu > 1500) {
1799 		NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported on XDP");
1800 		return -EOPNOTSUPP;
1801 	}
1802 
1803 	if (netif_running(dev))
1804 		netsec_netdev_stop(dev);
1805 
1806 	/* Detach old prog, if any */
1807 	old_prog = xchg(&priv->xdp_prog, prog);
1808 	if (old_prog)
1809 		bpf_prog_put(old_prog);
1810 
1811 	if (netif_running(dev))
1812 		netsec_netdev_open(dev);
1813 
1814 	return 0;
1815 }
1816 
1817 static int netsec_xdp(struct net_device *ndev, struct netdev_bpf *xdp)
1818 {
1819 	struct netsec_priv *priv = netdev_priv(ndev);
1820 
1821 	switch (xdp->command) {
1822 	case XDP_SETUP_PROG:
1823 		return netsec_xdp_setup(priv, xdp->prog, xdp->extack);
1824 	default:
1825 		return -EINVAL;
1826 	}
1827 }
1828 
1829 static const struct net_device_ops netsec_netdev_ops = {
1830 	.ndo_init		= netsec_netdev_init,
1831 	.ndo_uninit		= netsec_netdev_uninit,
1832 	.ndo_open		= netsec_netdev_open,
1833 	.ndo_stop		= netsec_netdev_stop,
1834 	.ndo_start_xmit		= netsec_netdev_start_xmit,
1835 	.ndo_set_features	= netsec_netdev_set_features,
1836 	.ndo_set_mac_address    = eth_mac_addr,
1837 	.ndo_validate_addr	= eth_validate_addr,
1838 	.ndo_eth_ioctl		= phy_do_ioctl,
1839 	.ndo_xdp_xmit		= netsec_xdp_xmit,
1840 	.ndo_bpf		= netsec_xdp,
1841 };
1842 
1843 static int netsec_of_probe(struct platform_device *pdev,
1844 			   struct netsec_priv *priv, u32 *phy_addr)
1845 {
1846 	int err;
1847 
1848 	err = of_get_phy_mode(pdev->dev.of_node, &priv->phy_interface);
1849 	if (err) {
1850 		dev_err(&pdev->dev, "missing required property 'phy-mode'\n");
1851 		return err;
1852 	}
1853 
1854 	priv->phy_np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
1855 	if (!priv->phy_np) {
1856 		dev_err(&pdev->dev, "missing required property 'phy-handle'\n");
1857 		return -EINVAL;
1858 	}
1859 
1860 	*phy_addr = of_mdio_parse_addr(&pdev->dev, priv->phy_np);
1861 
1862 	priv->clk = devm_clk_get(&pdev->dev, NULL); /* get by 'phy_ref_clk' */
1863 	if (IS_ERR(priv->clk))
1864 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk),
1865 				     "phy_ref_clk not found\n");
1866 	priv->freq = clk_get_rate(priv->clk);
1867 
1868 	return 0;
1869 }
1870 
1871 static int netsec_acpi_probe(struct platform_device *pdev,
1872 			     struct netsec_priv *priv, u32 *phy_addr)
1873 {
1874 	int ret;
1875 
1876 	if (!IS_ENABLED(CONFIG_ACPI))
1877 		return -ENODEV;
1878 
1879 	/* ACPI systems are assumed to configure the PHY in firmware, so
1880 	 * there is really no need to discover the PHY mode from the DSDT.
1881 	 * Since firmware is known to exist in the field that configures the
1882 	 * PHY correctly but passes the wrong mode string in the phy-mode
1883 	 * device property, we have no choice but to ignore it.
1884 	 */
1885 	priv->phy_interface = PHY_INTERFACE_MODE_NA;
1886 
1887 	ret = device_property_read_u32(&pdev->dev, "phy-channel", phy_addr);
1888 	if (ret)
1889 		return dev_err_probe(&pdev->dev, ret,
1890 				     "missing required property 'phy-channel'\n");
1891 
1892 	ret = device_property_read_u32(&pdev->dev,
1893 				       "socionext,phy-clock-frequency",
1894 				       &priv->freq);
1895 	if (ret)
1896 		return dev_err_probe(&pdev->dev, ret,
1897 				     "missing required property 'socionext,phy-clock-frequency'\n");
1898 	return 0;
1899 }
1900 
1901 static void netsec_unregister_mdio(struct netsec_priv *priv)
1902 {
1903 	struct phy_device *phydev = priv->phydev;
1904 
1905 	if (!dev_of_node(priv->dev) && phydev) {
1906 		phy_device_remove(phydev);
1907 		phy_device_free(phydev);
1908 	}
1909 
1910 	mdiobus_unregister(priv->mii_bus);
1911 }
1912 
1913 static int netsec_register_mdio(struct netsec_priv *priv, u32 phy_addr)
1914 {
1915 	struct mii_bus *bus;
1916 	int ret;
1917 
1918 	bus = devm_mdiobus_alloc(priv->dev);
1919 	if (!bus)
1920 		return -ENOMEM;
1921 
1922 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", dev_name(priv->dev));
1923 	bus->priv = priv;
1924 	bus->name = "SNI NETSEC MDIO";
1925 	bus->read = netsec_phy_read;
1926 	bus->write = netsec_phy_write;
1927 	bus->parent = priv->dev;
1928 	priv->mii_bus = bus;
1929 
1930 	if (dev_of_node(priv->dev)) {
1931 		struct device_node *mdio_node, *parent = dev_of_node(priv->dev);
1932 
1933 		mdio_node = of_get_child_by_name(parent, "mdio");
1934 		if (mdio_node) {
1935 			parent = mdio_node;
1936 		} else {
1937 			/* older f/w doesn't populate the mdio subnode,
1938 			 * allow relaxed upgrade of f/w in due time.
1939 			 */
1940 			dev_info(priv->dev, "Upgrade f/w for mdio subnode!\n");
1941 		}
1942 
1943 		ret = of_mdiobus_register(bus, parent);
1944 		of_node_put(mdio_node);
1945 
1946 		if (ret) {
1947 			dev_err(priv->dev, "mdiobus register err(%d)\n", ret);
1948 			return ret;
1949 		}
1950 	} else {
1951 		/* Mask out all PHYs from auto probing. */
1952 		bus->phy_mask = ~0;
1953 		ret = mdiobus_register(bus);
1954 		if (ret) {
1955 			dev_err(priv->dev, "mdiobus register err(%d)\n", ret);
1956 			return ret;
1957 		}
1958 
1959 		priv->phydev = get_phy_device(bus, phy_addr, false);
1960 		if (IS_ERR(priv->phydev)) {
1961 			ret = PTR_ERR(priv->phydev);
1962 			dev_err(priv->dev, "get_phy_device err(%d)\n", ret);
1963 			priv->phydev = NULL;
1964 			mdiobus_unregister(bus);
1965 			return -ENODEV;
1966 		}
1967 
1968 		ret = phy_device_register(priv->phydev);
1969 		if (ret) {
1970 			phy_device_free(priv->phydev);
1971 			mdiobus_unregister(bus);
1972 			dev_err(priv->dev,
1973 				"phy_device_register err(%d)\n", ret);
1974 		}
1975 	}
1976 
1977 	return ret;
1978 }
1979 
1980 static int netsec_probe(struct platform_device *pdev)
1981 {
1982 	struct resource *mmio_res, *eeprom_res;
1983 	struct netsec_priv *priv;
1984 	u32 hw_ver, phy_addr = 0;
1985 	struct net_device *ndev;
1986 	int ret;
1987 	int irq;
1988 
1989 	mmio_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1990 	if (!mmio_res) {
1991 		dev_err(&pdev->dev, "No MMIO resource found.\n");
1992 		return -ENODEV;
1993 	}
1994 
1995 	eeprom_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1996 	if (!eeprom_res) {
1997 		dev_info(&pdev->dev, "No EEPROM resource found.\n");
1998 		return -ENODEV;
1999 	}
2000 
2001 	irq = platform_get_irq(pdev, 0);
2002 	if (irq < 0)
2003 		return irq;
2004 
2005 	ndev = alloc_etherdev(sizeof(*priv));
2006 	if (!ndev)
2007 		return -ENOMEM;
2008 
2009 	priv = netdev_priv(ndev);
2010 
2011 	spin_lock_init(&priv->reglock);
2012 	SET_NETDEV_DEV(ndev, &pdev->dev);
2013 	platform_set_drvdata(pdev, priv);
2014 	ndev->irq = irq;
2015 	priv->dev = &pdev->dev;
2016 	priv->ndev = ndev;
2017 
2018 	priv->msg_enable = NETIF_MSG_TX_ERR | NETIF_MSG_HW | NETIF_MSG_DRV |
2019 			   NETIF_MSG_LINK | NETIF_MSG_PROBE;
2020 
2021 	priv->ioaddr = devm_ioremap(&pdev->dev, mmio_res->start,
2022 				    resource_size(mmio_res));
2023 	if (!priv->ioaddr) {
2024 		dev_err(&pdev->dev, "devm_ioremap() failed\n");
2025 		ret = -ENXIO;
2026 		goto free_ndev;
2027 	}
2028 
2029 	priv->eeprom_base = devm_ioremap(&pdev->dev, eeprom_res->start,
2030 					 resource_size(eeprom_res));
2031 	if (!priv->eeprom_base) {
2032 		dev_err(&pdev->dev, "devm_ioremap() failed for EEPROM\n");
2033 		ret = -ENXIO;
2034 		goto free_ndev;
2035 	}
2036 
2037 	ret = device_get_ethdev_address(&pdev->dev, ndev);
2038 	if (ret && priv->eeprom_base) {
2039 		void __iomem *macp = priv->eeprom_base +
2040 					NETSEC_EEPROM_MAC_ADDRESS;
2041 		u8 addr[ETH_ALEN];
2042 
2043 		addr[0] = readb(macp + 3);
2044 		addr[1] = readb(macp + 2);
2045 		addr[2] = readb(macp + 1);
2046 		addr[3] = readb(macp + 0);
2047 		addr[4] = readb(macp + 7);
2048 		addr[5] = readb(macp + 6);
2049 		eth_hw_addr_set(ndev, addr);
2050 	}
2051 
2052 	if (!is_valid_ether_addr(ndev->dev_addr)) {
2053 		dev_warn(&pdev->dev, "No MAC address found, using random\n");
2054 		eth_hw_addr_random(ndev);
2055 	}
2056 
2057 	if (dev_of_node(&pdev->dev))
2058 		ret = netsec_of_probe(pdev, priv, &phy_addr);
2059 	else
2060 		ret = netsec_acpi_probe(pdev, priv, &phy_addr);
2061 	if (ret)
2062 		goto free_ndev;
2063 
2064 	priv->phy_addr = phy_addr;
2065 
2066 	if (!priv->freq) {
2067 		dev_err(&pdev->dev, "missing PHY reference clock frequency\n");
2068 		ret = -ENODEV;
2069 		goto free_ndev;
2070 	}
2071 
2072 	/* default for throughput */
2073 	priv->et_coalesce.rx_coalesce_usecs = 500;
2074 	priv->et_coalesce.rx_max_coalesced_frames = 8;
2075 	priv->et_coalesce.tx_coalesce_usecs = 500;
2076 	priv->et_coalesce.tx_max_coalesced_frames = 8;
2077 
2078 	ret = device_property_read_u32(&pdev->dev, "max-frame-size",
2079 				       &ndev->max_mtu);
2080 	if (ret < 0)
2081 		ndev->max_mtu = ETH_DATA_LEN;
2082 
2083 	/* runtime_pm coverage just for probe, open/close also cover it */
2084 	pm_runtime_enable(&pdev->dev);
2085 	pm_runtime_get_sync(&pdev->dev);
2086 
2087 	hw_ver = netsec_read(priv, NETSEC_REG_F_TAIKI_VER);
2088 	/* this driver only supports F_TAIKI style NETSEC */
2089 	if (NETSEC_F_NETSEC_VER_MAJOR_NUM(hw_ver) !=
2090 	    NETSEC_F_NETSEC_VER_MAJOR_NUM(NETSEC_REG_NETSEC_VER_F_TAIKI)) {
2091 		ret = -ENODEV;
2092 		goto pm_disable;
2093 	}
2094 
2095 	dev_info(&pdev->dev, "hardware revision %d.%d\n",
2096 		 hw_ver >> 16, hw_ver & 0xffff);
2097 
2098 	netif_napi_add(ndev, &priv->napi, netsec_napi_poll);
2099 
2100 	ndev->netdev_ops = &netsec_netdev_ops;
2101 	ndev->ethtool_ops = &netsec_ethtool_ops;
2102 
2103 	ndev->features |= NETIF_F_HIGHDMA | NETIF_F_RXCSUM | NETIF_F_GSO |
2104 				NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
2105 	ndev->hw_features = ndev->features;
2106 
2107 	priv->rx_cksum_offload_flag = true;
2108 
2109 	ret = netsec_register_mdio(priv, phy_addr);
2110 	if (ret)
2111 		goto unreg_napi;
2112 
2113 	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40)))
2114 		dev_warn(&pdev->dev, "Failed to set DMA mask\n");
2115 
2116 	ret = register_netdev(ndev);
2117 	if (ret) {
2118 		netif_err(priv, probe, ndev, "register_netdev() failed\n");
2119 		goto unreg_mii;
2120 	}
2121 
2122 	pm_runtime_put_sync(&pdev->dev);
2123 	return 0;
2124 
2125 unreg_mii:
2126 	netsec_unregister_mdio(priv);
2127 unreg_napi:
2128 	netif_napi_del(&priv->napi);
2129 pm_disable:
2130 	pm_runtime_put_sync(&pdev->dev);
2131 	pm_runtime_disable(&pdev->dev);
2132 free_ndev:
2133 	free_netdev(ndev);
2134 	dev_err(&pdev->dev, "init failed\n");
2135 
2136 	return ret;
2137 }
2138 
2139 static int netsec_remove(struct platform_device *pdev)
2140 {
2141 	struct netsec_priv *priv = platform_get_drvdata(pdev);
2142 
2143 	unregister_netdev(priv->ndev);
2144 
2145 	netsec_unregister_mdio(priv);
2146 
2147 	netif_napi_del(&priv->napi);
2148 
2149 	pm_runtime_disable(&pdev->dev);
2150 	free_netdev(priv->ndev);
2151 
2152 	return 0;
2153 }
2154 
2155 #ifdef CONFIG_PM
2156 static int netsec_runtime_suspend(struct device *dev)
2157 {
2158 	struct netsec_priv *priv = dev_get_drvdata(dev);
2159 
2160 	netsec_write(priv, NETSEC_REG_CLK_EN, 0);
2161 
2162 	clk_disable_unprepare(priv->clk);
2163 
2164 	return 0;
2165 }
2166 
2167 static int netsec_runtime_resume(struct device *dev)
2168 {
2169 	struct netsec_priv *priv = dev_get_drvdata(dev);
2170 
2171 	clk_prepare_enable(priv->clk);
2172 
2173 	netsec_write(priv, NETSEC_REG_CLK_EN, NETSEC_CLK_EN_REG_DOM_D |
2174 					       NETSEC_CLK_EN_REG_DOM_C |
2175 					       NETSEC_CLK_EN_REG_DOM_G);
2176 	return 0;
2177 }
2178 #endif
2179 
2180 static const struct dev_pm_ops netsec_pm_ops = {
2181 	SET_RUNTIME_PM_OPS(netsec_runtime_suspend, netsec_runtime_resume, NULL)
2182 };
2183 
2184 static const struct of_device_id netsec_dt_ids[] = {
2185 	{ .compatible = "socionext,synquacer-netsec" },
2186 	{ }
2187 };
2188 MODULE_DEVICE_TABLE(of, netsec_dt_ids);
2189 
2190 #ifdef CONFIG_ACPI
2191 static const struct acpi_device_id netsec_acpi_ids[] = {
2192 	{ "SCX0001" },
2193 	{ }
2194 };
2195 MODULE_DEVICE_TABLE(acpi, netsec_acpi_ids);
2196 #endif
2197 
2198 static struct platform_driver netsec_driver = {
2199 	.probe	= netsec_probe,
2200 	.remove	= netsec_remove,
2201 	.driver = {
2202 		.name = "netsec",
2203 		.pm = &netsec_pm_ops,
2204 		.of_match_table = netsec_dt_ids,
2205 		.acpi_match_table = ACPI_PTR(netsec_acpi_ids),
2206 	},
2207 };
2208 module_platform_driver(netsec_driver);
2209 
2210 MODULE_AUTHOR("Jassi Brar <jaswinder.singh@linaro.org>");
2211 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
2212 MODULE_DESCRIPTION("NETSEC Ethernet driver");
2213 MODULE_LICENSE("GPL");
2214