xref: /rk3399_rockchip-uboot/drivers/net/dwc_eth_qos.c (revision 1e8d5d80b6b0adbeed4bfa0a78cc7ed757ecea66)
1 /*
2  * Copyright (c) 2016, NVIDIA CORPORATION.
3  *
4  * SPDX-License-Identifier: GPL-2.0
5  *
6  * Portions based on U-Boot's rtl8169.c.
7  */
8 
9 /*
10  * This driver supports the Synopsys Designware Ethernet QOS (Quality Of
11  * Service) IP block. The IP supports multiple options for bus type, clocking/
12  * reset structure, and feature list.
13  *
14  * The driver is written such that generic core logic is kept separate from
15  * configuration-specific logic. Code that interacts with configuration-
16  * specific resources is split out into separate functions to avoid polluting
17  * common code. If/when this driver is enhanced to support multiple
18  * configurations, the core code should be adapted to call all configuration-
19  * specific functions through function pointers, with the definition of those
20  * function pointers being supplied by struct udevice_id eqos_ids[]'s .data
21  * field.
22  *
23  * The following configurations are currently supported:
24  * tegra186:
25  *    NVIDIA's Tegra186 chip. This configuration uses an AXI master/DMA bus, an
26  *    AHB slave/register bus, contains the DMA, MTL, and MAC sub-blocks, and
27  *    supports a single RGMII PHY. This configuration also has SW control over
28  *    all clock and reset signals to the HW block.
29  */
30 #include <common.h>
31 #include <clk.h>
32 #include <dm.h>
33 #include <errno.h>
34 #include <memalign.h>
35 #include <miiphy.h>
36 #include <net.h>
37 #include <netdev.h>
38 #include <phy.h>
39 #include <reset.h>
40 #include <wait_bit.h>
41 #include <asm/gpio.h>
42 #include <asm/io.h>
43 
44 /* Core registers */
45 
46 #define EQOS_MAC_REGS_BASE 0x000
47 struct eqos_mac_regs {
48 	uint32_t configuration;				/* 0x000 */
49 	uint32_t unused_004[(0x070 - 0x004) / 4];	/* 0x004 */
50 	uint32_t q0_tx_flow_ctrl;			/* 0x070 */
51 	uint32_t unused_070[(0x090 - 0x074) / 4];	/* 0x074 */
52 	uint32_t rx_flow_ctrl;				/* 0x090 */
53 	uint32_t unused_094;				/* 0x094 */
54 	uint32_t txq_prty_map0;				/* 0x098 */
55 	uint32_t unused_09c;				/* 0x09c */
56 	uint32_t rxq_ctrl0;				/* 0x0a0 */
57 	uint32_t unused_0a4;				/* 0x0a4 */
58 	uint32_t rxq_ctrl2;				/* 0x0a8 */
59 	uint32_t unused_0ac[(0x0dc - 0x0ac) / 4];	/* 0x0ac */
60 	uint32_t us_tic_counter;			/* 0x0dc */
61 	uint32_t unused_0e0[(0x11c - 0x0e0) / 4];	/* 0x0e0 */
62 	uint32_t hw_feature0;				/* 0x11c */
63 	uint32_t hw_feature1;				/* 0x120 */
64 	uint32_t hw_feature2;				/* 0x124 */
65 	uint32_t unused_128[(0x200 - 0x128) / 4];	/* 0x128 */
66 	uint32_t mdio_address;				/* 0x200 */
67 	uint32_t mdio_data;				/* 0x204 */
68 	uint32_t unused_208[(0x300 - 0x208) / 4];	/* 0x208 */
69 	uint32_t address0_high;				/* 0x300 */
70 	uint32_t address0_low;				/* 0x304 */
71 };
72 
73 #define EQOS_MAC_CONFIGURATION_GPSLCE			BIT(23)
74 #define EQOS_MAC_CONFIGURATION_CST			BIT(21)
75 #define EQOS_MAC_CONFIGURATION_ACS			BIT(20)
76 #define EQOS_MAC_CONFIGURATION_WD			BIT(19)
77 #define EQOS_MAC_CONFIGURATION_JD			BIT(17)
78 #define EQOS_MAC_CONFIGURATION_JE			BIT(16)
79 #define EQOS_MAC_CONFIGURATION_PS			BIT(15)
80 #define EQOS_MAC_CONFIGURATION_FES			BIT(14)
81 #define EQOS_MAC_CONFIGURATION_DM			BIT(13)
82 #define EQOS_MAC_CONFIGURATION_TE			BIT(1)
83 #define EQOS_MAC_CONFIGURATION_RE			BIT(0)
84 
85 #define EQOS_MAC_Q0_TX_FLOW_CTRL_PT_SHIFT		16
86 #define EQOS_MAC_Q0_TX_FLOW_CTRL_PT_MASK		0xffff
87 #define EQOS_MAC_Q0_TX_FLOW_CTRL_TFE			BIT(1)
88 
89 #define EQOS_MAC_RX_FLOW_CTRL_RFE			BIT(0)
90 
91 #define EQOS_MAC_TXQ_PRTY_MAP0_PSTQ0_SHIFT		0
92 #define EQOS_MAC_TXQ_PRTY_MAP0_PSTQ0_MASK		0xff
93 
94 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT			0
95 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_MASK			3
96 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_NOT_ENABLED		0
97 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB		2
98 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV		1
99 
100 #define EQOS_MAC_RXQ_CTRL2_PSRQ0_SHIFT			0
101 #define EQOS_MAC_RXQ_CTRL2_PSRQ0_MASK			0xff
102 
103 #define EQOS_MAC_HW_FEATURE1_TXFIFOSIZE_SHIFT		6
104 #define EQOS_MAC_HW_FEATURE1_TXFIFOSIZE_MASK		0x1f
105 #define EQOS_MAC_HW_FEATURE1_RXFIFOSIZE_SHIFT		0
106 #define EQOS_MAC_HW_FEATURE1_RXFIFOSIZE_MASK		0x1f
107 
108 #define EQOS_MAC_MDIO_ADDRESS_PA_SHIFT			21
109 #define EQOS_MAC_MDIO_ADDRESS_RDA_SHIFT			16
110 #define EQOS_MAC_MDIO_ADDRESS_CR_SHIFT			8
111 #define EQOS_MAC_MDIO_ADDRESS_CR_20_35			2
112 #define EQOS_MAC_MDIO_ADDRESS_CR_250_300		5
113 #define EQOS_MAC_MDIO_ADDRESS_SKAP			BIT(4)
114 #define EQOS_MAC_MDIO_ADDRESS_GOC_SHIFT			2
115 #define EQOS_MAC_MDIO_ADDRESS_GOC_READ			3
116 #define EQOS_MAC_MDIO_ADDRESS_GOC_WRITE			1
117 #define EQOS_MAC_MDIO_ADDRESS_C45E			BIT(1)
118 #define EQOS_MAC_MDIO_ADDRESS_GB			BIT(0)
119 
120 #define EQOS_MAC_MDIO_DATA_GD_MASK			0xffff
121 
122 #define EQOS_MTL_REGS_BASE 0xd00
123 struct eqos_mtl_regs {
124 	uint32_t txq0_operation_mode;			/* 0xd00 */
125 	uint32_t unused_d04;				/* 0xd04 */
126 	uint32_t txq0_debug;				/* 0xd08 */
127 	uint32_t unused_d0c[(0xd18 - 0xd0c) / 4];	/* 0xd0c */
128 	uint32_t txq0_quantum_weight;			/* 0xd18 */
129 	uint32_t unused_d1c[(0xd30 - 0xd1c) / 4];	/* 0xd1c */
130 	uint32_t rxq0_operation_mode;			/* 0xd30 */
131 	uint32_t unused_d34;				/* 0xd34 */
132 	uint32_t rxq0_debug;				/* 0xd38 */
133 };
134 
135 #define EQOS_MTL_TXQ0_OPERATION_MODE_TQS_SHIFT		16
136 #define EQOS_MTL_TXQ0_OPERATION_MODE_TQS_MASK		0x1ff
137 #define EQOS_MTL_TXQ0_OPERATION_MODE_TXQEN_SHIFT	2
138 #define EQOS_MTL_TXQ0_OPERATION_MODE_TXQEN_MASK		3
139 #define EQOS_MTL_TXQ0_OPERATION_MODE_TXQEN_ENABLED	2
140 #define EQOS_MTL_TXQ0_OPERATION_MODE_TSF		BIT(1)
141 #define EQOS_MTL_TXQ0_OPERATION_MODE_FTQ		BIT(0)
142 
143 #define EQOS_MTL_TXQ0_DEBUG_TXQSTS			BIT(4)
144 #define EQOS_MTL_TXQ0_DEBUG_TRCSTS_SHIFT		1
145 #define EQOS_MTL_TXQ0_DEBUG_TRCSTS_MASK			3
146 
147 #define EQOS_MTL_RXQ0_OPERATION_MODE_RQS_SHIFT		20
148 #define EQOS_MTL_RXQ0_OPERATION_MODE_RQS_MASK		0x3ff
149 #define EQOS_MTL_RXQ0_OPERATION_MODE_RFD_SHIFT		14
150 #define EQOS_MTL_RXQ0_OPERATION_MODE_RFD_MASK		0x3f
151 #define EQOS_MTL_RXQ0_OPERATION_MODE_RFA_SHIFT		8
152 #define EQOS_MTL_RXQ0_OPERATION_MODE_RFA_MASK		0x3f
153 #define EQOS_MTL_RXQ0_OPERATION_MODE_EHFC		BIT(7)
154 #define EQOS_MTL_RXQ0_OPERATION_MODE_RSF		BIT(5)
155 
156 #define EQOS_MTL_RXQ0_DEBUG_PRXQ_SHIFT			16
157 #define EQOS_MTL_RXQ0_DEBUG_PRXQ_MASK			0x7fff
158 #define EQOS_MTL_RXQ0_DEBUG_RXQSTS_SHIFT		4
159 #define EQOS_MTL_RXQ0_DEBUG_RXQSTS_MASK			3
160 
161 #define EQOS_DMA_REGS_BASE 0x1000
162 struct eqos_dma_regs {
163 	uint32_t mode;					/* 0x1000 */
164 	uint32_t sysbus_mode;				/* 0x1004 */
165 	uint32_t unused_1008[(0x1100 - 0x1008) / 4];	/* 0x1008 */
166 	uint32_t ch0_control;				/* 0x1100 */
167 	uint32_t ch0_tx_control;			/* 0x1104 */
168 	uint32_t ch0_rx_control;			/* 0x1108 */
169 	uint32_t unused_110c;				/* 0x110c */
170 	uint32_t ch0_txdesc_list_haddress;		/* 0x1110 */
171 	uint32_t ch0_txdesc_list_address;		/* 0x1114 */
172 	uint32_t ch0_rxdesc_list_haddress;		/* 0x1118 */
173 	uint32_t ch0_rxdesc_list_address;		/* 0x111c */
174 	uint32_t ch0_txdesc_tail_pointer;		/* 0x1120 */
175 	uint32_t unused_1124;				/* 0x1124 */
176 	uint32_t ch0_rxdesc_tail_pointer;		/* 0x1128 */
177 	uint32_t ch0_txdesc_ring_length;		/* 0x112c */
178 	uint32_t ch0_rxdesc_ring_length;		/* 0x1130 */
179 };
180 
181 #define EQOS_DMA_MODE_SWR				BIT(0)
182 
183 #define EQOS_DMA_SYSBUS_MODE_RD_OSR_LMT_SHIFT		16
184 #define EQOS_DMA_SYSBUS_MODE_RD_OSR_LMT_MASK		0xf
185 #define EQOS_DMA_SYSBUS_MODE_EAME			BIT(11)
186 #define EQOS_DMA_SYSBUS_MODE_BLEN16			BIT(3)
187 #define EQOS_DMA_SYSBUS_MODE_BLEN8			BIT(2)
188 #define EQOS_DMA_SYSBUS_MODE_BLEN4			BIT(1)
189 
190 #define EQOS_DMA_CH0_CONTROL_PBLX8			BIT(16)
191 
192 #define EQOS_DMA_CH0_TX_CONTROL_TXPBL_SHIFT		16
193 #define EQOS_DMA_CH0_TX_CONTROL_TXPBL_MASK		0x3f
194 #define EQOS_DMA_CH0_TX_CONTROL_OSP			BIT(4)
195 #define EQOS_DMA_CH0_TX_CONTROL_ST			BIT(0)
196 
197 #define EQOS_DMA_CH0_RX_CONTROL_RXPBL_SHIFT		16
198 #define EQOS_DMA_CH0_RX_CONTROL_RXPBL_MASK		0x3f
199 #define EQOS_DMA_CH0_RX_CONTROL_RBSZ_SHIFT		1
200 #define EQOS_DMA_CH0_RX_CONTROL_RBSZ_MASK		0x3fff
201 #define EQOS_DMA_CH0_RX_CONTROL_SR			BIT(0)
202 
203 /* These registers are Tegra186-specific */
204 #define EQOS_TEGRA186_REGS_BASE 0x8800
205 struct eqos_tegra186_regs {
206 	uint32_t sdmemcomppadctrl;			/* 0x8800 */
207 	uint32_t auto_cal_config;			/* 0x8804 */
208 	uint32_t unused_8808;				/* 0x8808 */
209 	uint32_t auto_cal_status;			/* 0x880c */
210 };
211 
212 #define EQOS_SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD	BIT(31)
213 
214 #define EQOS_AUTO_CAL_CONFIG_START			BIT(31)
215 #define EQOS_AUTO_CAL_CONFIG_ENABLE			BIT(29)
216 
217 #define EQOS_AUTO_CAL_STATUS_ACTIVE			BIT(31)
218 
219 /* Descriptors */
220 
221 #define EQOS_DESCRIPTOR_WORDS	4
222 #define EQOS_DESCRIPTOR_SIZE	(EQOS_DESCRIPTOR_WORDS * 4)
223 /* We assume ARCH_DMA_MINALIGN >= 16; 16 is the EQOS HW minimum */
224 #define EQOS_DESCRIPTOR_ALIGN	ARCH_DMA_MINALIGN
225 #define EQOS_DESCRIPTORS_TX	4
226 #define EQOS_DESCRIPTORS_RX	4
227 #define EQOS_DESCRIPTORS_NUM	(EQOS_DESCRIPTORS_TX + EQOS_DESCRIPTORS_RX)
228 #define EQOS_DESCRIPTORS_SIZE	ALIGN(EQOS_DESCRIPTORS_NUM * \
229 				      EQOS_DESCRIPTOR_SIZE, ARCH_DMA_MINALIGN)
230 #define EQOS_BUFFER_ALIGN	ARCH_DMA_MINALIGN
231 #define EQOS_MAX_PACKET_SIZE	ALIGN(1568, ARCH_DMA_MINALIGN)
232 #define EQOS_RX_BUFFER_SIZE	(EQOS_DESCRIPTORS_RX * EQOS_MAX_PACKET_SIZE)
233 
234 /*
235  * Warn if the cache-line size is larger than the descriptor size. In such
236  * cases the driver will likely fail because the CPU needs to flush the cache
237  * when requeuing RX buffers, therefore descriptors written by the hardware
238  * may be discarded. Architectures with full IO coherence, such as x86, do not
239  * experience this issue, and hence are excluded from this condition.
240  *
241  * This can be fixed by defining CONFIG_SYS_NONCACHED_MEMORY which will cause
242  * the driver to allocate descriptors from a pool of non-cached memory.
243  */
244 #if EQOS_DESCRIPTOR_SIZE < ARCH_DMA_MINALIGN
245 #if !defined(CONFIG_SYS_NONCACHED_MEMORY) && \
246 	!defined(CONFIG_SYS_DCACHE_OFF) && !defined(CONFIG_X86)
247 #warning Cache line size is larger than descriptor size
248 #endif
249 #endif
250 
251 struct eqos_desc {
252 	u32 des0;
253 	u32 des1;
254 	u32 des2;
255 	u32 des3;
256 };
257 
258 #define EQOS_DESC3_OWN		BIT(31)
259 #define EQOS_DESC3_FD		BIT(29)
260 #define EQOS_DESC3_LD		BIT(28)
261 #define EQOS_DESC3_BUF1V	BIT(24)
262 
263 struct eqos_config {
264 	bool reg_access_always_ok;
265 	int mdio_wait;
266 	int swr_wait;
267 	int config_mac;
268 	int config_mac_mdio;
269 	phy_interface_t (*interface)(struct udevice *dev);
270 	struct eqos_ops *ops;
271 };
272 
273 struct eqos_ops {
274 	void (*eqos_inval_desc)(void *desc);
275 	void (*eqos_flush_desc)(void *desc);
276 	void (*eqos_inval_buffer)(void *buf, size_t size);
277 	void (*eqos_flush_buffer)(void *buf, size_t size);
278 	int (*eqos_probe_resources)(struct udevice *dev);
279 	int (*eqos_remove_resources)(struct udevice *dev);
280 	int (*eqos_stop_resets)(struct udevice *dev);
281 	int (*eqos_start_resets)(struct udevice *dev);
282 	void (*eqos_stop_clks)(struct udevice *dev);
283 	int (*eqos_start_clks)(struct udevice *dev);
284 	int (*eqos_calibrate_pads)(struct udevice *dev);
285 	int (*eqos_disable_calibration)(struct udevice *dev);
286 	int (*eqos_set_tx_clk_speed)(struct udevice *dev);
287 	ulong (*eqos_get_tick_clk_rate)(struct udevice *dev);
288 };
289 
290 struct eqos_priv {
291 	struct udevice *dev;
292 	const struct eqos_config *config;
293 	fdt_addr_t regs;
294 	struct eqos_mac_regs *mac_regs;
295 	struct eqos_mtl_regs *mtl_regs;
296 	struct eqos_dma_regs *dma_regs;
297 	struct eqos_tegra186_regs *tegra186_regs;
298 	struct reset_ctl reset_ctl;
299 	struct gpio_desc phy_reset_gpio;
300 	struct clk clk_master_bus;
301 	struct clk clk_rx;
302 	struct clk clk_ptp_ref;
303 	struct clk clk_tx;
304 	struct clk clk_ck;
305 	struct clk clk_slave_bus;
306 	struct mii_dev *mii;
307 	struct phy_device *phy;
308 	void *descs;
309 	struct eqos_desc *tx_descs;
310 	struct eqos_desc *rx_descs;
311 	int tx_desc_idx, rx_desc_idx;
312 	void *tx_dma_buf;
313 	void *rx_dma_buf;
314 	void *rx_pkt;
315 	bool started;
316 	bool reg_access_ok;
317 };
318 
319 /*
320  * TX and RX descriptors are 16 bytes. This causes problems with the cache
321  * maintenance on CPUs where the cache-line size exceeds the size of these
322  * descriptors. What will happen is that when the driver receives a packet
323  * it will be immediately requeued for the hardware to reuse. The CPU will
324  * therefore need to flush the cache-line containing the descriptor, which
325  * will cause all other descriptors in the same cache-line to be flushed
326  * along with it. If one of those descriptors had been written to by the
327  * device those changes (and the associated packet) will be lost.
328  *
329  * To work around this, we make use of non-cached memory if available. If
330  * descriptors are mapped uncached there's no need to manually flush them
331  * or invalidate them.
332  *
333  * Note that this only applies to descriptors. The packet data buffers do
334  * not have the same constraints since they are 1536 bytes large, so they
335  * are unlikely to share cache-lines.
336  */
337 static void *eqos_alloc_descs(unsigned int num)
338 {
339 #ifdef CONFIG_SYS_NONCACHED_MEMORY
340 	return (void *)noncached_alloc(EQOS_DESCRIPTORS_SIZE,
341 				      EQOS_DESCRIPTOR_ALIGN);
342 #else
343 	return memalign(EQOS_DESCRIPTOR_ALIGN, EQOS_DESCRIPTORS_SIZE);
344 #endif
345 }
346 
347 static void eqos_free_descs(void *descs)
348 {
349 #ifdef CONFIG_SYS_NONCACHED_MEMORY
350 	/* FIXME: noncached_alloc() has no opposite */
351 #else
352 	free(descs);
353 #endif
354 }
355 
356 static void eqos_inval_desc_tegra186(void *desc)
357 {
358 #ifndef CONFIG_SYS_NONCACHED_MEMORY
359 	unsigned long start = (unsigned long)desc & ~(ARCH_DMA_MINALIGN - 1);
360 	unsigned long end = ALIGN(start + EQOS_DESCRIPTOR_SIZE,
361 				  ARCH_DMA_MINALIGN);
362 
363 	invalidate_dcache_range(start, end);
364 #endif
365 }
366 
367 static void eqos_inval_desc_stm32(void *desc)
368 {
369 #ifndef CONFIG_SYS_NONCACHED_MEMORY
370 	unsigned long start = rounddown((unsigned long)desc, ARCH_DMA_MINALIGN);
371 	unsigned long end = roundup((unsigned long)desc + EQOS_DESCRIPTOR_SIZE,
372 				    ARCH_DMA_MINALIGN);
373 
374 	invalidate_dcache_range(start, end);
375 #endif
376 }
377 
378 static void eqos_flush_desc_tegra186(void *desc)
379 {
380 #ifndef CONFIG_SYS_NONCACHED_MEMORY
381 	flush_cache((unsigned long)desc, EQOS_DESCRIPTOR_SIZE);
382 #endif
383 }
384 
385 static void eqos_flush_desc_stm32(void *desc)
386 {
387 #ifndef CONFIG_SYS_NONCACHED_MEMORY
388 	unsigned long start = rounddown((unsigned long)desc, ARCH_DMA_MINALIGN);
389 	unsigned long end = roundup((unsigned long)desc + EQOS_DESCRIPTOR_SIZE,
390 				    ARCH_DMA_MINALIGN);
391 
392 	flush_dcache_range(start, end);
393 #endif
394 }
395 
396 static void eqos_inval_buffer_tegra186(void *buf, size_t size)
397 {
398 	unsigned long start = (unsigned long)buf & ~(ARCH_DMA_MINALIGN - 1);
399 	unsigned long end = ALIGN(start + size, ARCH_DMA_MINALIGN);
400 
401 	invalidate_dcache_range(start, end);
402 }
403 
404 static void eqos_inval_buffer_stm32(void *buf, size_t size)
405 {
406 	unsigned long start = rounddown((unsigned long)buf, ARCH_DMA_MINALIGN);
407 	unsigned long end = roundup((unsigned long)buf + size,
408 				    ARCH_DMA_MINALIGN);
409 
410 	invalidate_dcache_range(start, end);
411 }
412 
413 static void eqos_flush_buffer_tegra186(void *buf, size_t size)
414 {
415 	flush_cache((unsigned long)buf, size);
416 }
417 
418 static void eqos_flush_buffer_stm32(void *buf, size_t size)
419 {
420 	unsigned long start = rounddown((unsigned long)buf, ARCH_DMA_MINALIGN);
421 	unsigned long end = roundup((unsigned long)buf + size,
422 				    ARCH_DMA_MINALIGN);
423 
424 	flush_dcache_range(start, end);
425 }
426 
427 static int eqos_mdio_wait_idle(struct eqos_priv *eqos)
428 {
429 	return wait_for_bit_le32(&eqos->mac_regs->mdio_address,
430 				 EQOS_MAC_MDIO_ADDRESS_GB, false,
431 				 1000000, true);
432 }
433 
434 static int eqos_mdio_read(struct mii_dev *bus, int mdio_addr, int mdio_devad,
435 			  int mdio_reg)
436 {
437 	struct eqos_priv *eqos = bus->priv;
438 	u32 val;
439 	int ret;
440 
441 	debug("%s(dev=%p, addr=%x, reg=%d):\n", __func__, eqos->dev, mdio_addr,
442 	      mdio_reg);
443 
444 	ret = eqos_mdio_wait_idle(eqos);
445 	if (ret) {
446 		pr_err("MDIO not idle at entry");
447 		return ret;
448 	}
449 
450 	val = readl(&eqos->mac_regs->mdio_address);
451 	val &= EQOS_MAC_MDIO_ADDRESS_SKAP |
452 		EQOS_MAC_MDIO_ADDRESS_C45E;
453 	val |= (mdio_addr << EQOS_MAC_MDIO_ADDRESS_PA_SHIFT) |
454 		(mdio_reg << EQOS_MAC_MDIO_ADDRESS_RDA_SHIFT) |
455 		(eqos->config->config_mac_mdio <<
456 		 EQOS_MAC_MDIO_ADDRESS_CR_SHIFT) |
457 		(EQOS_MAC_MDIO_ADDRESS_GOC_READ <<
458 		 EQOS_MAC_MDIO_ADDRESS_GOC_SHIFT) |
459 		EQOS_MAC_MDIO_ADDRESS_GB;
460 	writel(val, &eqos->mac_regs->mdio_address);
461 
462 	udelay(eqos->config->mdio_wait);
463 
464 	ret = eqos_mdio_wait_idle(eqos);
465 	if (ret) {
466 		pr_err("MDIO read didn't complete");
467 		return ret;
468 	}
469 
470 	val = readl(&eqos->mac_regs->mdio_data);
471 	val &= EQOS_MAC_MDIO_DATA_GD_MASK;
472 
473 	debug("%s: val=%x\n", __func__, val);
474 
475 	return val;
476 }
477 
478 static int eqos_mdio_write(struct mii_dev *bus, int mdio_addr, int mdio_devad,
479 			   int mdio_reg, u16 mdio_val)
480 {
481 	struct eqos_priv *eqos = bus->priv;
482 	u32 val;
483 	int ret;
484 
485 	debug("%s(dev=%p, addr=%x, reg=%d, val=%x):\n", __func__, eqos->dev,
486 	      mdio_addr, mdio_reg, mdio_val);
487 
488 	ret = eqos_mdio_wait_idle(eqos);
489 	if (ret) {
490 		pr_err("MDIO not idle at entry");
491 		return ret;
492 	}
493 
494 	writel(mdio_val, &eqos->mac_regs->mdio_data);
495 
496 	val = readl(&eqos->mac_regs->mdio_address);
497 	val &= EQOS_MAC_MDIO_ADDRESS_SKAP |
498 		EQOS_MAC_MDIO_ADDRESS_C45E;
499 	val |= (mdio_addr << EQOS_MAC_MDIO_ADDRESS_PA_SHIFT) |
500 		(mdio_reg << EQOS_MAC_MDIO_ADDRESS_RDA_SHIFT) |
501 		(eqos->config->config_mac_mdio <<
502 		 EQOS_MAC_MDIO_ADDRESS_CR_SHIFT) |
503 		(EQOS_MAC_MDIO_ADDRESS_GOC_WRITE <<
504 		 EQOS_MAC_MDIO_ADDRESS_GOC_SHIFT) |
505 		EQOS_MAC_MDIO_ADDRESS_GB;
506 	writel(val, &eqos->mac_regs->mdio_address);
507 
508 	udelay(eqos->config->mdio_wait);
509 
510 	ret = eqos_mdio_wait_idle(eqos);
511 	if (ret) {
512 		pr_err("MDIO read didn't complete");
513 		return ret;
514 	}
515 
516 	return 0;
517 }
518 
519 static int eqos_start_clks_tegra186(struct udevice *dev)
520 {
521 	struct eqos_priv *eqos = dev_get_priv(dev);
522 	int ret;
523 
524 	debug("%s(dev=%p):\n", __func__, dev);
525 
526 	ret = clk_enable(&eqos->clk_slave_bus);
527 	if (ret < 0) {
528 		pr_err("clk_enable(clk_slave_bus) failed: %d", ret);
529 		goto err;
530 	}
531 
532 	ret = clk_enable(&eqos->clk_master_bus);
533 	if (ret < 0) {
534 		pr_err("clk_enable(clk_master_bus) failed: %d", ret);
535 		goto err_disable_clk_slave_bus;
536 	}
537 
538 	ret = clk_enable(&eqos->clk_rx);
539 	if (ret < 0) {
540 		pr_err("clk_enable(clk_rx) failed: %d", ret);
541 		goto err_disable_clk_master_bus;
542 	}
543 
544 	ret = clk_enable(&eqos->clk_ptp_ref);
545 	if (ret < 0) {
546 		pr_err("clk_enable(clk_ptp_ref) failed: %d", ret);
547 		goto err_disable_clk_rx;
548 	}
549 
550 	ret = clk_set_rate(&eqos->clk_ptp_ref, 125 * 1000 * 1000);
551 	if (ret < 0) {
552 		pr_err("clk_set_rate(clk_ptp_ref) failed: %d", ret);
553 		goto err_disable_clk_ptp_ref;
554 	}
555 
556 	ret = clk_enable(&eqos->clk_tx);
557 	if (ret < 0) {
558 		pr_err("clk_enable(clk_tx) failed: %d", ret);
559 		goto err_disable_clk_ptp_ref;
560 	}
561 
562 	debug("%s: OK\n", __func__);
563 	return 0;
564 
565 err_disable_clk_ptp_ref:
566 	clk_disable(&eqos->clk_ptp_ref);
567 err_disable_clk_rx:
568 	clk_disable(&eqos->clk_rx);
569 err_disable_clk_master_bus:
570 	clk_disable(&eqos->clk_master_bus);
571 err_disable_clk_slave_bus:
572 	clk_disable(&eqos->clk_slave_bus);
573 err:
574 	debug("%s: FAILED: %d\n", __func__, ret);
575 	return ret;
576 }
577 
578 static int eqos_start_clks_stm32(struct udevice *dev)
579 {
580 	struct eqos_priv *eqos = dev_get_priv(dev);
581 	int ret;
582 
583 	debug("%s(dev=%p):\n", __func__, dev);
584 
585 	ret = clk_enable(&eqos->clk_master_bus);
586 	if (ret < 0) {
587 		pr_err("clk_enable(clk_master_bus) failed: %d", ret);
588 		goto err;
589 	}
590 
591 	ret = clk_enable(&eqos->clk_rx);
592 	if (ret < 0) {
593 		pr_err("clk_enable(clk_rx) failed: %d", ret);
594 		goto err_disable_clk_master_bus;
595 	}
596 
597 	ret = clk_enable(&eqos->clk_tx);
598 	if (ret < 0) {
599 		pr_err("clk_enable(clk_tx) failed: %d", ret);
600 		goto err_disable_clk_rx;
601 	}
602 
603 	if (clk_valid(&eqos->clk_ck)) {
604 		ret = clk_enable(&eqos->clk_ck);
605 		if (ret < 0) {
606 			pr_err("clk_enable(clk_ck) failed: %d", ret);
607 			goto err_disable_clk_tx;
608 		}
609 	}
610 
611 	debug("%s: OK\n", __func__);
612 	return 0;
613 
614 err_disable_clk_tx:
615 	clk_disable(&eqos->clk_tx);
616 err_disable_clk_rx:
617 	clk_disable(&eqos->clk_rx);
618 err_disable_clk_master_bus:
619 	clk_disable(&eqos->clk_master_bus);
620 err:
621 	debug("%s: FAILED: %d\n", __func__, ret);
622 	return ret;
623 }
624 
625 static void eqos_stop_clks_tegra186(struct udevice *dev)
626 {
627 	struct eqos_priv *eqos = dev_get_priv(dev);
628 
629 	debug("%s(dev=%p):\n", __func__, dev);
630 
631 	clk_disable(&eqos->clk_tx);
632 	clk_disable(&eqos->clk_ptp_ref);
633 	clk_disable(&eqos->clk_rx);
634 	clk_disable(&eqos->clk_master_bus);
635 	clk_disable(&eqos->clk_slave_bus);
636 
637 	debug("%s: OK\n", __func__);
638 }
639 
640 static void eqos_stop_clks_stm32(struct udevice *dev)
641 {
642 	struct eqos_priv *eqos = dev_get_priv(dev);
643 
644 	debug("%s(dev=%p):\n", __func__, dev);
645 
646 	clk_disable(&eqos->clk_tx);
647 	clk_disable(&eqos->clk_rx);
648 	clk_disable(&eqos->clk_master_bus);
649 	if (clk_valid(&eqos->clk_ck))
650 		clk_disable(&eqos->clk_ck);
651 
652 	debug("%s: OK\n", __func__);
653 }
654 
655 static int eqos_start_resets_tegra186(struct udevice *dev)
656 {
657 	struct eqos_priv *eqos = dev_get_priv(dev);
658 	int ret;
659 
660 	debug("%s(dev=%p):\n", __func__, dev);
661 
662 	ret = dm_gpio_set_value(&eqos->phy_reset_gpio, 1);
663 	if (ret < 0) {
664 		pr_err("dm_gpio_set_value(phy_reset, assert) failed: %d", ret);
665 		return ret;
666 	}
667 
668 	udelay(2);
669 
670 	ret = dm_gpio_set_value(&eqos->phy_reset_gpio, 0);
671 	if (ret < 0) {
672 		pr_err("dm_gpio_set_value(phy_reset, deassert) failed: %d", ret);
673 		return ret;
674 	}
675 
676 	ret = reset_assert(&eqos->reset_ctl);
677 	if (ret < 0) {
678 		pr_err("reset_assert() failed: %d", ret);
679 		return ret;
680 	}
681 
682 	udelay(2);
683 
684 	ret = reset_deassert(&eqos->reset_ctl);
685 	if (ret < 0) {
686 		pr_err("reset_deassert() failed: %d", ret);
687 		return ret;
688 	}
689 
690 	debug("%s: OK\n", __func__);
691 	return 0;
692 }
693 
694 static int eqos_start_resets_stm32(struct udevice *dev)
695 {
696 	return 0;
697 }
698 
699 static int eqos_stop_resets_tegra186(struct udevice *dev)
700 {
701 	struct eqos_priv *eqos = dev_get_priv(dev);
702 
703 	reset_assert(&eqos->reset_ctl);
704 	dm_gpio_set_value(&eqos->phy_reset_gpio, 1);
705 
706 	return 0;
707 }
708 
709 static int eqos_stop_resets_stm32(struct udevice *dev)
710 {
711 	return 0;
712 }
713 
714 static int eqos_calibrate_pads_tegra186(struct udevice *dev)
715 {
716 	struct eqos_priv *eqos = dev_get_priv(dev);
717 	int ret;
718 
719 	debug("%s(dev=%p):\n", __func__, dev);
720 
721 	setbits_le32(&eqos->tegra186_regs->sdmemcomppadctrl,
722 		     EQOS_SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD);
723 
724 	udelay(1);
725 
726 	setbits_le32(&eqos->tegra186_regs->auto_cal_config,
727 		     EQOS_AUTO_CAL_CONFIG_START | EQOS_AUTO_CAL_CONFIG_ENABLE);
728 
729 	ret = wait_for_bit_le32(&eqos->tegra186_regs->auto_cal_status,
730 				EQOS_AUTO_CAL_STATUS_ACTIVE, true, 10, false);
731 	if (ret) {
732 		pr_err("calibrate didn't start");
733 		goto failed;
734 	}
735 
736 	ret = wait_for_bit_le32(&eqos->tegra186_regs->auto_cal_status,
737 				EQOS_AUTO_CAL_STATUS_ACTIVE, false, 10, false);
738 	if (ret) {
739 		pr_err("calibrate didn't finish");
740 		goto failed;
741 	}
742 
743 	ret = 0;
744 
745 failed:
746 	clrbits_le32(&eqos->tegra186_regs->sdmemcomppadctrl,
747 		     EQOS_SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD);
748 
749 	debug("%s: returns %d\n", __func__, ret);
750 
751 	return ret;
752 }
753 
754 static int eqos_disable_calibration_tegra186(struct udevice *dev)
755 {
756 	struct eqos_priv *eqos = dev_get_priv(dev);
757 
758 	debug("%s(dev=%p):\n", __func__, dev);
759 
760 	clrbits_le32(&eqos->tegra186_regs->auto_cal_config,
761 		     EQOS_AUTO_CAL_CONFIG_ENABLE);
762 
763 	return 0;
764 }
765 
766 static ulong eqos_get_tick_clk_rate_tegra186(struct udevice *dev)
767 {
768 	struct eqos_priv *eqos = dev_get_priv(dev);
769 
770 	return clk_get_rate(&eqos->clk_slave_bus);
771 }
772 
773 static ulong eqos_get_tick_clk_rate_stm32(struct udevice *dev)
774 {
775 	struct eqos_priv *eqos = dev_get_priv(dev);
776 
777 	return clk_get_rate(&eqos->clk_master_bus);
778 }
779 
780 static int eqos_calibrate_pads_stm32(struct udevice *dev)
781 {
782 	return 0;
783 }
784 
785 static int eqos_disable_calibration_stm32(struct udevice *dev)
786 {
787 	return 0;
788 }
789 
790 static int eqos_set_full_duplex(struct udevice *dev)
791 {
792 	struct eqos_priv *eqos = dev_get_priv(dev);
793 
794 	debug("%s(dev=%p):\n", __func__, dev);
795 
796 	setbits_le32(&eqos->mac_regs->configuration, EQOS_MAC_CONFIGURATION_DM);
797 
798 	return 0;
799 }
800 
801 static int eqos_set_half_duplex(struct udevice *dev)
802 {
803 	struct eqos_priv *eqos = dev_get_priv(dev);
804 
805 	debug("%s(dev=%p):\n", __func__, dev);
806 
807 	clrbits_le32(&eqos->mac_regs->configuration, EQOS_MAC_CONFIGURATION_DM);
808 
809 	/* WAR: Flush TX queue when switching to half-duplex */
810 	setbits_le32(&eqos->mtl_regs->txq0_operation_mode,
811 		     EQOS_MTL_TXQ0_OPERATION_MODE_FTQ);
812 
813 	return 0;
814 }
815 
816 static int eqos_set_gmii_speed(struct udevice *dev)
817 {
818 	struct eqos_priv *eqos = dev_get_priv(dev);
819 
820 	debug("%s(dev=%p):\n", __func__, dev);
821 
822 	clrbits_le32(&eqos->mac_regs->configuration,
823 		     EQOS_MAC_CONFIGURATION_PS | EQOS_MAC_CONFIGURATION_FES);
824 
825 	return 0;
826 }
827 
828 static int eqos_set_mii_speed_100(struct udevice *dev)
829 {
830 	struct eqos_priv *eqos = dev_get_priv(dev);
831 
832 	debug("%s(dev=%p):\n", __func__, dev);
833 
834 	setbits_le32(&eqos->mac_regs->configuration,
835 		     EQOS_MAC_CONFIGURATION_PS | EQOS_MAC_CONFIGURATION_FES);
836 
837 	return 0;
838 }
839 
840 static int eqos_set_mii_speed_10(struct udevice *dev)
841 {
842 	struct eqos_priv *eqos = dev_get_priv(dev);
843 
844 	debug("%s(dev=%p):\n", __func__, dev);
845 
846 	clrsetbits_le32(&eqos->mac_regs->configuration,
847 			EQOS_MAC_CONFIGURATION_FES, EQOS_MAC_CONFIGURATION_PS);
848 
849 	return 0;
850 }
851 
852 static int eqos_set_tx_clk_speed_tegra186(struct udevice *dev)
853 {
854 	struct eqos_priv *eqos = dev_get_priv(dev);
855 	ulong rate;
856 	int ret;
857 
858 	debug("%s(dev=%p):\n", __func__, dev);
859 
860 	switch (eqos->phy->speed) {
861 	case SPEED_1000:
862 		rate = 125 * 1000 * 1000;
863 		break;
864 	case SPEED_100:
865 		rate = 25 * 1000 * 1000;
866 		break;
867 	case SPEED_10:
868 		rate = 2.5 * 1000 * 1000;
869 		break;
870 	default:
871 		pr_err("invalid speed %d", eqos->phy->speed);
872 		return -EINVAL;
873 	}
874 
875 	ret = clk_set_rate(&eqos->clk_tx, rate);
876 	if (ret < 0) {
877 		pr_err("clk_set_rate(tx_clk, %lu) failed: %d", rate, ret);
878 		return ret;
879 	}
880 
881 	return 0;
882 }
883 
884 static int eqos_set_tx_clk_speed_stm32(struct udevice *dev)
885 {
886 	return 0;
887 }
888 
889 static int eqos_adjust_link(struct udevice *dev)
890 {
891 	struct eqos_priv *eqos = dev_get_priv(dev);
892 	int ret;
893 	bool en_calibration;
894 
895 	debug("%s(dev=%p):\n", __func__, dev);
896 
897 	if (eqos->phy->duplex)
898 		ret = eqos_set_full_duplex(dev);
899 	else
900 		ret = eqos_set_half_duplex(dev);
901 	if (ret < 0) {
902 		pr_err("eqos_set_*_duplex() failed: %d", ret);
903 		return ret;
904 	}
905 
906 	switch (eqos->phy->speed) {
907 	case SPEED_1000:
908 		en_calibration = true;
909 		ret = eqos_set_gmii_speed(dev);
910 		break;
911 	case SPEED_100:
912 		en_calibration = true;
913 		ret = eqos_set_mii_speed_100(dev);
914 		break;
915 	case SPEED_10:
916 		en_calibration = false;
917 		ret = eqos_set_mii_speed_10(dev);
918 		break;
919 	default:
920 		pr_err("invalid speed %d", eqos->phy->speed);
921 		return -EINVAL;
922 	}
923 	if (ret < 0) {
924 		pr_err("eqos_set_*mii_speed*() failed: %d", ret);
925 		return ret;
926 	}
927 
928 	if (en_calibration) {
929 		ret = eqos->config->ops->eqos_calibrate_pads(dev);
930 		if (ret < 0) {
931 			pr_err("eqos_calibrate_pads() failed: %d",
932 			       ret);
933 			return ret;
934 		}
935 	} else {
936 		ret = eqos->config->ops->eqos_disable_calibration(dev);
937 		if (ret < 0) {
938 			pr_err("eqos_disable_calibration() failed: %d",
939 			       ret);
940 			return ret;
941 		}
942 	}
943 	ret = eqos->config->ops->eqos_set_tx_clk_speed(dev);
944 	if (ret < 0) {
945 		pr_err("eqos_set_tx_clk_speed() failed: %d", ret);
946 		return ret;
947 	}
948 
949 	return 0;
950 }
951 
952 static int eqos_write_hwaddr(struct udevice *dev)
953 {
954 	struct eth_pdata *plat = dev_get_platdata(dev);
955 	struct eqos_priv *eqos = dev_get_priv(dev);
956 	uint32_t val;
957 
958 	/*
959 	 * This function may be called before start() or after stop(). At that
960 	 * time, on at least some configurations of the EQoS HW, all clocks to
961 	 * the EQoS HW block will be stopped, and a reset signal applied. If
962 	 * any register access is attempted in this state, bus timeouts or CPU
963 	 * hangs may occur. This check prevents that.
964 	 *
965 	 * A simple solution to this problem would be to not implement
966 	 * write_hwaddr(), since start() always writes the MAC address into HW
967 	 * anyway. However, it is desirable to implement write_hwaddr() to
968 	 * support the case of SW that runs subsequent to U-Boot which expects
969 	 * the MAC address to already be programmed into the EQoS registers,
970 	 * which must happen irrespective of whether the U-Boot user (or
971 	 * scripts) actually made use of the EQoS device, and hence
972 	 * irrespective of whether start() was ever called.
973 	 *
974 	 * Note that this requirement by subsequent SW is not valid for
975 	 * Tegra186, and is likely not valid for any non-PCI instantiation of
976 	 * the EQoS HW block. This function is implemented solely as
977 	 * future-proofing with the expectation the driver will eventually be
978 	 * ported to some system where the expectation above is true.
979 	 */
980 	if (!eqos->config->reg_access_always_ok && !eqos->reg_access_ok)
981 		return 0;
982 
983 	/* Update the MAC address */
984 	val = (plat->enetaddr[5] << 8) |
985 		(plat->enetaddr[4]);
986 	writel(val, &eqos->mac_regs->address0_high);
987 	val = (plat->enetaddr[3] << 24) |
988 		(plat->enetaddr[2] << 16) |
989 		(plat->enetaddr[1] << 8) |
990 		(plat->enetaddr[0]);
991 	writel(val, &eqos->mac_regs->address0_low);
992 
993 	return 0;
994 }
995 
996 static int eqos_start(struct udevice *dev)
997 {
998 	struct eqos_priv *eqos = dev_get_priv(dev);
999 	int ret, i;
1000 	ulong rate;
1001 	u32 val, tx_fifo_sz, rx_fifo_sz, tqs, rqs, pbl;
1002 	ulong last_rx_desc;
1003 
1004 	debug("%s(dev=%p):\n", __func__, dev);
1005 
1006 	eqos->tx_desc_idx = 0;
1007 	eqos->rx_desc_idx = 0;
1008 
1009 	ret = eqos->config->ops->eqos_start_clks(dev);
1010 	if (ret < 0) {
1011 		pr_err("eqos_start_clks() failed: %d", ret);
1012 		goto err;
1013 	}
1014 
1015 	ret = eqos->config->ops->eqos_start_resets(dev);
1016 	if (ret < 0) {
1017 		pr_err("eqos_start_resets() failed: %d", ret);
1018 		goto err_stop_clks;
1019 	}
1020 
1021 	udelay(10);
1022 
1023 	eqos->reg_access_ok = true;
1024 
1025 	ret = wait_for_bit_le32(&eqos->dma_regs->mode,
1026 				EQOS_DMA_MODE_SWR, false,
1027 				eqos->config->swr_wait, false);
1028 	if (ret) {
1029 		pr_err("EQOS_DMA_MODE_SWR stuck");
1030 		goto err_stop_resets;
1031 	}
1032 
1033 	ret = eqos->config->ops->eqos_calibrate_pads(dev);
1034 	if (ret < 0) {
1035 		pr_err("eqos_calibrate_pads() failed: %d", ret);
1036 		goto err_stop_resets;
1037 	}
1038 	rate = eqos->config->ops->eqos_get_tick_clk_rate(dev);
1039 
1040 	val = (rate / 1000000) - 1;
1041 	writel(val, &eqos->mac_regs->us_tic_counter);
1042 
1043 	/*
1044 	 * if PHY was already connected and configured,
1045 	 * don't need to reconnect/reconfigure again
1046 	 */
1047 	if (!eqos->phy) {
1048 		eqos->phy = phy_connect(eqos->mii, 0, dev,
1049 					eqos->config->interface(dev));
1050 		if (!eqos->phy) {
1051 			pr_err("phy_connect() failed");
1052 			goto err_stop_resets;
1053 		}
1054 		ret = phy_config(eqos->phy);
1055 		if (ret < 0) {
1056 			pr_err("phy_config() failed: %d", ret);
1057 			goto err_shutdown_phy;
1058 		}
1059 	}
1060 
1061 	ret = phy_startup(eqos->phy);
1062 	if (ret < 0) {
1063 		pr_err("phy_startup() failed: %d", ret);
1064 		goto err_shutdown_phy;
1065 	}
1066 
1067 	if (!eqos->phy->link) {
1068 		pr_err("No link");
1069 		goto err_shutdown_phy;
1070 	}
1071 
1072 	ret = eqos_adjust_link(dev);
1073 	if (ret < 0) {
1074 		pr_err("eqos_adjust_link() failed: %d", ret);
1075 		goto err_shutdown_phy;
1076 	}
1077 
1078 	/* Configure MTL */
1079 
1080 	/* Enable Store and Forward mode for TX */
1081 	/* Program Tx operating mode */
1082 	setbits_le32(&eqos->mtl_regs->txq0_operation_mode,
1083 		     EQOS_MTL_TXQ0_OPERATION_MODE_TSF |
1084 		     (EQOS_MTL_TXQ0_OPERATION_MODE_TXQEN_ENABLED <<
1085 		      EQOS_MTL_TXQ0_OPERATION_MODE_TXQEN_SHIFT));
1086 
1087 	/* Transmit Queue weight */
1088 	writel(0x10, &eqos->mtl_regs->txq0_quantum_weight);
1089 
1090 	/* Enable Store and Forward mode for RX, since no jumbo frame */
1091 	setbits_le32(&eqos->mtl_regs->rxq0_operation_mode,
1092 		     EQOS_MTL_RXQ0_OPERATION_MODE_RSF);
1093 
1094 	/* Transmit/Receive queue fifo size; use all RAM for 1 queue */
1095 	val = readl(&eqos->mac_regs->hw_feature1);
1096 	tx_fifo_sz = (val >> EQOS_MAC_HW_FEATURE1_TXFIFOSIZE_SHIFT) &
1097 		EQOS_MAC_HW_FEATURE1_TXFIFOSIZE_MASK;
1098 	rx_fifo_sz = (val >> EQOS_MAC_HW_FEATURE1_RXFIFOSIZE_SHIFT) &
1099 		EQOS_MAC_HW_FEATURE1_RXFIFOSIZE_MASK;
1100 
1101 	/*
1102 	 * r/tx_fifo_sz is encoded as log2(n / 128). Undo that by shifting.
1103 	 * r/tqs is encoded as (n / 256) - 1.
1104 	 */
1105 	tqs = (128 << tx_fifo_sz) / 256 - 1;
1106 	rqs = (128 << rx_fifo_sz) / 256 - 1;
1107 
1108 	clrsetbits_le32(&eqos->mtl_regs->txq0_operation_mode,
1109 			EQOS_MTL_TXQ0_OPERATION_MODE_TQS_MASK <<
1110 			EQOS_MTL_TXQ0_OPERATION_MODE_TQS_SHIFT,
1111 			tqs << EQOS_MTL_TXQ0_OPERATION_MODE_TQS_SHIFT);
1112 	clrsetbits_le32(&eqos->mtl_regs->rxq0_operation_mode,
1113 			EQOS_MTL_RXQ0_OPERATION_MODE_RQS_MASK <<
1114 			EQOS_MTL_RXQ0_OPERATION_MODE_RQS_SHIFT,
1115 			rqs << EQOS_MTL_RXQ0_OPERATION_MODE_RQS_SHIFT);
1116 
1117 	/* Flow control used only if each channel gets 4KB or more FIFO */
1118 	if (rqs >= ((4096 / 256) - 1)) {
1119 		u32 rfd, rfa;
1120 
1121 		setbits_le32(&eqos->mtl_regs->rxq0_operation_mode,
1122 			     EQOS_MTL_RXQ0_OPERATION_MODE_EHFC);
1123 
1124 		/*
1125 		 * Set Threshold for Activating Flow Contol space for min 2
1126 		 * frames ie, (1500 * 1) = 1500 bytes.
1127 		 *
1128 		 * Set Threshold for Deactivating Flow Contol for space of
1129 		 * min 1 frame (frame size 1500bytes) in receive fifo
1130 		 */
1131 		if (rqs == ((4096 / 256) - 1)) {
1132 			/*
1133 			 * This violates the above formula because of FIFO size
1134 			 * limit therefore overflow may occur inspite of this.
1135 			 */
1136 			rfd = 0x3;	/* Full-3K */
1137 			rfa = 0x1;	/* Full-1.5K */
1138 		} else if (rqs == ((8192 / 256) - 1)) {
1139 			rfd = 0x6;	/* Full-4K */
1140 			rfa = 0xa;	/* Full-6K */
1141 		} else if (rqs == ((16384 / 256) - 1)) {
1142 			rfd = 0x6;	/* Full-4K */
1143 			rfa = 0x12;	/* Full-10K */
1144 		} else {
1145 			rfd = 0x6;	/* Full-4K */
1146 			rfa = 0x1E;	/* Full-16K */
1147 		}
1148 
1149 		clrsetbits_le32(&eqos->mtl_regs->rxq0_operation_mode,
1150 				(EQOS_MTL_RXQ0_OPERATION_MODE_RFD_MASK <<
1151 				 EQOS_MTL_RXQ0_OPERATION_MODE_RFD_SHIFT) |
1152 				(EQOS_MTL_RXQ0_OPERATION_MODE_RFA_MASK <<
1153 				 EQOS_MTL_RXQ0_OPERATION_MODE_RFA_SHIFT),
1154 				(rfd <<
1155 				 EQOS_MTL_RXQ0_OPERATION_MODE_RFD_SHIFT) |
1156 				(rfa <<
1157 				 EQOS_MTL_RXQ0_OPERATION_MODE_RFA_SHIFT));
1158 	}
1159 
1160 	/* Configure MAC */
1161 
1162 	clrsetbits_le32(&eqos->mac_regs->rxq_ctrl0,
1163 			EQOS_MAC_RXQ_CTRL0_RXQ0EN_MASK <<
1164 			EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT,
1165 			eqos->config->config_mac <<
1166 			EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT);
1167 
1168 	/* Set TX flow control parameters */
1169 	/* Set Pause Time */
1170 	setbits_le32(&eqos->mac_regs->q0_tx_flow_ctrl,
1171 		     0xffff << EQOS_MAC_Q0_TX_FLOW_CTRL_PT_SHIFT);
1172 	/* Assign priority for TX flow control */
1173 	clrbits_le32(&eqos->mac_regs->txq_prty_map0,
1174 		     EQOS_MAC_TXQ_PRTY_MAP0_PSTQ0_MASK <<
1175 		     EQOS_MAC_TXQ_PRTY_MAP0_PSTQ0_SHIFT);
1176 	/* Assign priority for RX flow control */
1177 	clrbits_le32(&eqos->mac_regs->rxq_ctrl2,
1178 		     EQOS_MAC_RXQ_CTRL2_PSRQ0_MASK <<
1179 		     EQOS_MAC_RXQ_CTRL2_PSRQ0_SHIFT);
1180 	/* Enable flow control */
1181 	setbits_le32(&eqos->mac_regs->q0_tx_flow_ctrl,
1182 		     EQOS_MAC_Q0_TX_FLOW_CTRL_TFE);
1183 	setbits_le32(&eqos->mac_regs->rx_flow_ctrl,
1184 		     EQOS_MAC_RX_FLOW_CTRL_RFE);
1185 
1186 	clrsetbits_le32(&eqos->mac_regs->configuration,
1187 			EQOS_MAC_CONFIGURATION_GPSLCE |
1188 			EQOS_MAC_CONFIGURATION_WD |
1189 			EQOS_MAC_CONFIGURATION_JD |
1190 			EQOS_MAC_CONFIGURATION_JE,
1191 			EQOS_MAC_CONFIGURATION_CST |
1192 			EQOS_MAC_CONFIGURATION_ACS);
1193 
1194 	eqos_write_hwaddr(dev);
1195 
1196 	/* Configure DMA */
1197 
1198 	/* Enable OSP mode */
1199 	setbits_le32(&eqos->dma_regs->ch0_tx_control,
1200 		     EQOS_DMA_CH0_TX_CONTROL_OSP);
1201 
1202 	/* RX buffer size. Must be a multiple of bus width */
1203 	clrsetbits_le32(&eqos->dma_regs->ch0_rx_control,
1204 			EQOS_DMA_CH0_RX_CONTROL_RBSZ_MASK <<
1205 			EQOS_DMA_CH0_RX_CONTROL_RBSZ_SHIFT,
1206 			EQOS_MAX_PACKET_SIZE <<
1207 			EQOS_DMA_CH0_RX_CONTROL_RBSZ_SHIFT);
1208 
1209 	setbits_le32(&eqos->dma_regs->ch0_control,
1210 		     EQOS_DMA_CH0_CONTROL_PBLX8);
1211 
1212 	/*
1213 	 * Burst length must be < 1/2 FIFO size.
1214 	 * FIFO size in tqs is encoded as (n / 256) - 1.
1215 	 * Each burst is n * 8 (PBLX8) * 16 (AXI width) == 128 bytes.
1216 	 * Half of n * 256 is n * 128, so pbl == tqs, modulo the -1.
1217 	 */
1218 	pbl = tqs + 1;
1219 	if (pbl > 32)
1220 		pbl = 32;
1221 	clrsetbits_le32(&eqos->dma_regs->ch0_tx_control,
1222 			EQOS_DMA_CH0_TX_CONTROL_TXPBL_MASK <<
1223 			EQOS_DMA_CH0_TX_CONTROL_TXPBL_SHIFT,
1224 			pbl << EQOS_DMA_CH0_TX_CONTROL_TXPBL_SHIFT);
1225 
1226 	clrsetbits_le32(&eqos->dma_regs->ch0_rx_control,
1227 			EQOS_DMA_CH0_RX_CONTROL_RXPBL_MASK <<
1228 			EQOS_DMA_CH0_RX_CONTROL_RXPBL_SHIFT,
1229 			8 << EQOS_DMA_CH0_RX_CONTROL_RXPBL_SHIFT);
1230 
1231 	/* DMA performance configuration */
1232 	val = (2 << EQOS_DMA_SYSBUS_MODE_RD_OSR_LMT_SHIFT) |
1233 		EQOS_DMA_SYSBUS_MODE_EAME | EQOS_DMA_SYSBUS_MODE_BLEN16 |
1234 		EQOS_DMA_SYSBUS_MODE_BLEN8 | EQOS_DMA_SYSBUS_MODE_BLEN4;
1235 	writel(val, &eqos->dma_regs->sysbus_mode);
1236 
1237 	/* Set up descriptors */
1238 
1239 	memset(eqos->descs, 0, EQOS_DESCRIPTORS_SIZE);
1240 	for (i = 0; i < EQOS_DESCRIPTORS_RX; i++) {
1241 		struct eqos_desc *rx_desc = &(eqos->rx_descs[i]);
1242 		rx_desc->des0 = (u32)(ulong)(eqos->rx_dma_buf +
1243 					     (i * EQOS_MAX_PACKET_SIZE));
1244 		rx_desc->des3 |= EQOS_DESC3_OWN | EQOS_DESC3_BUF1V;
1245 	}
1246 	eqos->config->ops->eqos_flush_desc(eqos->descs);
1247 
1248 	writel(0, &eqos->dma_regs->ch0_txdesc_list_haddress);
1249 	writel((ulong)eqos->tx_descs, &eqos->dma_regs->ch0_txdesc_list_address);
1250 	writel(EQOS_DESCRIPTORS_TX - 1,
1251 	       &eqos->dma_regs->ch0_txdesc_ring_length);
1252 
1253 	writel(0, &eqos->dma_regs->ch0_rxdesc_list_haddress);
1254 	writel((ulong)eqos->rx_descs, &eqos->dma_regs->ch0_rxdesc_list_address);
1255 	writel(EQOS_DESCRIPTORS_RX - 1,
1256 	       &eqos->dma_regs->ch0_rxdesc_ring_length);
1257 
1258 	/* Enable everything */
1259 
1260 	setbits_le32(&eqos->mac_regs->configuration,
1261 		     EQOS_MAC_CONFIGURATION_TE | EQOS_MAC_CONFIGURATION_RE);
1262 
1263 	setbits_le32(&eqos->dma_regs->ch0_tx_control,
1264 		     EQOS_DMA_CH0_TX_CONTROL_ST);
1265 	setbits_le32(&eqos->dma_regs->ch0_rx_control,
1266 		     EQOS_DMA_CH0_RX_CONTROL_SR);
1267 
1268 	/* TX tail pointer not written until we need to TX a packet */
1269 	/*
1270 	 * Point RX tail pointer at last descriptor. Ideally, we'd point at the
1271 	 * first descriptor, implying all descriptors were available. However,
1272 	 * that's not distinguishable from none of the descriptors being
1273 	 * available.
1274 	 */
1275 	last_rx_desc = (ulong)&(eqos->rx_descs[(EQOS_DESCRIPTORS_RX - 1)]);
1276 	writel(last_rx_desc, &eqos->dma_regs->ch0_rxdesc_tail_pointer);
1277 
1278 	eqos->started = true;
1279 
1280 	debug("%s: OK\n", __func__);
1281 	return 0;
1282 
1283 err_shutdown_phy:
1284 	phy_shutdown(eqos->phy);
1285 err_stop_resets:
1286 	eqos->config->ops->eqos_stop_resets(dev);
1287 err_stop_clks:
1288 	eqos->config->ops->eqos_stop_clks(dev);
1289 err:
1290 	pr_err("FAILED: %d", ret);
1291 	return ret;
1292 }
1293 
1294 static void eqos_stop(struct udevice *dev)
1295 {
1296 	struct eqos_priv *eqos = dev_get_priv(dev);
1297 	int i;
1298 
1299 	debug("%s(dev=%p):\n", __func__, dev);
1300 
1301 	if (!eqos->started)
1302 		return;
1303 	eqos->started = false;
1304 	eqos->reg_access_ok = false;
1305 
1306 	/* Disable TX DMA */
1307 	clrbits_le32(&eqos->dma_regs->ch0_tx_control,
1308 		     EQOS_DMA_CH0_TX_CONTROL_ST);
1309 
1310 	/* Wait for TX all packets to drain out of MTL */
1311 	for (i = 0; i < 1000000; i++) {
1312 		u32 val = readl(&eqos->mtl_regs->txq0_debug);
1313 		u32 trcsts = (val >> EQOS_MTL_TXQ0_DEBUG_TRCSTS_SHIFT) &
1314 			EQOS_MTL_TXQ0_DEBUG_TRCSTS_MASK;
1315 		u32 txqsts = val & EQOS_MTL_TXQ0_DEBUG_TXQSTS;
1316 		if ((trcsts != 1) && (!txqsts))
1317 			break;
1318 	}
1319 
1320 	/* Turn off MAC TX and RX */
1321 	clrbits_le32(&eqos->mac_regs->configuration,
1322 		     EQOS_MAC_CONFIGURATION_TE | EQOS_MAC_CONFIGURATION_RE);
1323 
1324 	/* Wait for all RX packets to drain out of MTL */
1325 	for (i = 0; i < 1000000; i++) {
1326 		u32 val = readl(&eqos->mtl_regs->rxq0_debug);
1327 		u32 prxq = (val >> EQOS_MTL_RXQ0_DEBUG_PRXQ_SHIFT) &
1328 			EQOS_MTL_RXQ0_DEBUG_PRXQ_MASK;
1329 		u32 rxqsts = (val >> EQOS_MTL_RXQ0_DEBUG_RXQSTS_SHIFT) &
1330 			EQOS_MTL_RXQ0_DEBUG_RXQSTS_MASK;
1331 		if ((!prxq) && (!rxqsts))
1332 			break;
1333 	}
1334 
1335 	/* Turn off RX DMA */
1336 	clrbits_le32(&eqos->dma_regs->ch0_rx_control,
1337 		     EQOS_DMA_CH0_RX_CONTROL_SR);
1338 
1339 	if (eqos->phy) {
1340 		phy_shutdown(eqos->phy);
1341 	}
1342 	eqos->config->ops->eqos_stop_resets(dev);
1343 	eqos->config->ops->eqos_stop_clks(dev);
1344 
1345 	debug("%s: OK\n", __func__);
1346 }
1347 
1348 static int eqos_send(struct udevice *dev, void *packet, int length)
1349 {
1350 	struct eqos_priv *eqos = dev_get_priv(dev);
1351 	struct eqos_desc *tx_desc;
1352 	int i;
1353 
1354 	debug("%s(dev=%p, packet=%p, length=%d):\n", __func__, dev, packet,
1355 	      length);
1356 
1357 	memcpy(eqos->tx_dma_buf, packet, length);
1358 	eqos->config->ops->eqos_flush_buffer(eqos->tx_dma_buf, length);
1359 
1360 	tx_desc = &(eqos->tx_descs[eqos->tx_desc_idx]);
1361 	eqos->tx_desc_idx++;
1362 	eqos->tx_desc_idx %= EQOS_DESCRIPTORS_TX;
1363 
1364 	tx_desc->des0 = (ulong)eqos->tx_dma_buf;
1365 	tx_desc->des1 = 0;
1366 	tx_desc->des2 = length;
1367 	/*
1368 	 * Make sure that if HW sees the _OWN write below, it will see all the
1369 	 * writes to the rest of the descriptor too.
1370 	 */
1371 	mb();
1372 	tx_desc->des3 = EQOS_DESC3_OWN | EQOS_DESC3_FD | EQOS_DESC3_LD | length;
1373 	eqos->config->ops->eqos_flush_desc(tx_desc);
1374 
1375 	writel((ulong)(tx_desc + 1), &eqos->dma_regs->ch0_txdesc_tail_pointer);
1376 
1377 	for (i = 0; i < 1000000; i++) {
1378 		eqos->config->ops->eqos_inval_desc(tx_desc);
1379 		if (!(readl(&tx_desc->des3) & EQOS_DESC3_OWN))
1380 			return 0;
1381 		udelay(1);
1382 	}
1383 
1384 	debug("%s: TX timeout\n", __func__);
1385 
1386 	return -ETIMEDOUT;
1387 }
1388 
1389 static int eqos_recv(struct udevice *dev, int flags, uchar **packetp)
1390 {
1391 	struct eqos_priv *eqos = dev_get_priv(dev);
1392 	struct eqos_desc *rx_desc;
1393 	int length;
1394 
1395 	debug("%s(dev=%p, flags=%x):\n", __func__, dev, flags);
1396 
1397 	rx_desc = &(eqos->rx_descs[eqos->rx_desc_idx]);
1398 	if (rx_desc->des3 & EQOS_DESC3_OWN) {
1399 		debug("%s: RX packet not available\n", __func__);
1400 		return -EAGAIN;
1401 	}
1402 
1403 	*packetp = eqos->rx_dma_buf +
1404 		(eqos->rx_desc_idx * EQOS_MAX_PACKET_SIZE);
1405 	length = rx_desc->des3 & 0x7fff;
1406 	debug("%s: *packetp=%p, length=%d\n", __func__, *packetp, length);
1407 
1408 	eqos->config->ops->eqos_inval_buffer(*packetp, length);
1409 
1410 	return length;
1411 }
1412 
1413 static int eqos_free_pkt(struct udevice *dev, uchar *packet, int length)
1414 {
1415 	struct eqos_priv *eqos = dev_get_priv(dev);
1416 	uchar *packet_expected;
1417 	struct eqos_desc *rx_desc;
1418 
1419 	debug("%s(packet=%p, length=%d)\n", __func__, packet, length);
1420 
1421 	packet_expected = eqos->rx_dma_buf +
1422 		(eqos->rx_desc_idx * EQOS_MAX_PACKET_SIZE);
1423 	if (packet != packet_expected) {
1424 		debug("%s: Unexpected packet (expected %p)\n", __func__,
1425 		      packet_expected);
1426 		return -EINVAL;
1427 	}
1428 
1429 	rx_desc = &(eqos->rx_descs[eqos->rx_desc_idx]);
1430 	rx_desc->des0 = (u32)(ulong)packet;
1431 	rx_desc->des1 = 0;
1432 	rx_desc->des2 = 0;
1433 	/*
1434 	 * Make sure that if HW sees the _OWN write below, it will see all the
1435 	 * writes to the rest of the descriptor too.
1436 	 */
1437 	mb();
1438 	rx_desc->des3 |= EQOS_DESC3_OWN | EQOS_DESC3_BUF1V;
1439 	eqos->config->ops->eqos_flush_desc(rx_desc);
1440 
1441 	writel((ulong)rx_desc, &eqos->dma_regs->ch0_rxdesc_tail_pointer);
1442 
1443 	eqos->rx_desc_idx++;
1444 	eqos->rx_desc_idx %= EQOS_DESCRIPTORS_RX;
1445 
1446 	return 0;
1447 }
1448 
1449 static int eqos_probe_resources_core(struct udevice *dev)
1450 {
1451 	struct eqos_priv *eqos = dev_get_priv(dev);
1452 	int ret;
1453 
1454 	debug("%s(dev=%p):\n", __func__, dev);
1455 
1456 	eqos->descs = eqos_alloc_descs(EQOS_DESCRIPTORS_TX +
1457 				       EQOS_DESCRIPTORS_RX);
1458 	if (!eqos->descs) {
1459 		debug("%s: eqos_alloc_descs() failed\n", __func__);
1460 		ret = -ENOMEM;
1461 		goto err;
1462 	}
1463 	eqos->tx_descs = (struct eqos_desc *)eqos->descs;
1464 	eqos->rx_descs = (eqos->tx_descs + EQOS_DESCRIPTORS_TX);
1465 	debug("%s: tx_descs=%p, rx_descs=%p\n", __func__, eqos->tx_descs,
1466 	      eqos->rx_descs);
1467 
1468 	eqos->tx_dma_buf = memalign(EQOS_BUFFER_ALIGN, EQOS_MAX_PACKET_SIZE);
1469 	if (!eqos->tx_dma_buf) {
1470 		debug("%s: memalign(tx_dma_buf) failed\n", __func__);
1471 		ret = -ENOMEM;
1472 		goto err_free_descs;
1473 	}
1474 	debug("%s: tx_dma_buf=%p\n", __func__, eqos->tx_dma_buf);
1475 
1476 	eqos->rx_dma_buf = memalign(EQOS_BUFFER_ALIGN, EQOS_RX_BUFFER_SIZE);
1477 	if (!eqos->rx_dma_buf) {
1478 		debug("%s: memalign(rx_dma_buf) failed\n", __func__);
1479 		ret = -ENOMEM;
1480 		goto err_free_tx_dma_buf;
1481 	}
1482 	debug("%s: rx_dma_buf=%p\n", __func__, eqos->rx_dma_buf);
1483 
1484 	eqos->rx_pkt = malloc(EQOS_MAX_PACKET_SIZE);
1485 	if (!eqos->rx_pkt) {
1486 		debug("%s: malloc(rx_pkt) failed\n", __func__);
1487 		ret = -ENOMEM;
1488 		goto err_free_rx_dma_buf;
1489 	}
1490 	debug("%s: rx_pkt=%p\n", __func__, eqos->rx_pkt);
1491 
1492 	debug("%s: OK\n", __func__);
1493 	return 0;
1494 
1495 err_free_rx_dma_buf:
1496 	free(eqos->rx_dma_buf);
1497 err_free_tx_dma_buf:
1498 	free(eqos->tx_dma_buf);
1499 err_free_descs:
1500 	eqos_free_descs(eqos->descs);
1501 err:
1502 
1503 	debug("%s: returns %d\n", __func__, ret);
1504 	return ret;
1505 }
1506 
1507 static int eqos_remove_resources_core(struct udevice *dev)
1508 {
1509 	struct eqos_priv *eqos = dev_get_priv(dev);
1510 
1511 	debug("%s(dev=%p):\n", __func__, dev);
1512 
1513 	free(eqos->rx_pkt);
1514 	free(eqos->rx_dma_buf);
1515 	free(eqos->tx_dma_buf);
1516 	eqos_free_descs(eqos->descs);
1517 
1518 	debug("%s: OK\n", __func__);
1519 	return 0;
1520 }
1521 
1522 static int eqos_probe_resources_tegra186(struct udevice *dev)
1523 {
1524 	struct eqos_priv *eqos = dev_get_priv(dev);
1525 	int ret;
1526 
1527 	debug("%s(dev=%p):\n", __func__, dev);
1528 
1529 	ret = reset_get_by_name(dev, "eqos", &eqos->reset_ctl);
1530 	if (ret) {
1531 		pr_err("reset_get_by_name(rst) failed: %d", ret);
1532 		return ret;
1533 	}
1534 
1535 	ret = gpio_request_by_name(dev, "phy-reset-gpios", 0,
1536 				   &eqos->phy_reset_gpio,
1537 				   GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
1538 	if (ret) {
1539 		pr_err("gpio_request_by_name(phy reset) failed: %d", ret);
1540 		goto err_free_reset_eqos;
1541 	}
1542 
1543 	ret = clk_get_by_name(dev, "slave_bus", &eqos->clk_slave_bus);
1544 	if (ret) {
1545 		pr_err("clk_get_by_name(slave_bus) failed: %d", ret);
1546 		goto err_free_gpio_phy_reset;
1547 	}
1548 
1549 	ret = clk_get_by_name(dev, "master_bus", &eqos->clk_master_bus);
1550 	if (ret) {
1551 		pr_err("clk_get_by_name(master_bus) failed: %d", ret);
1552 		goto err_free_clk_slave_bus;
1553 	}
1554 
1555 	ret = clk_get_by_name(dev, "rx", &eqos->clk_rx);
1556 	if (ret) {
1557 		pr_err("clk_get_by_name(rx) failed: %d", ret);
1558 		goto err_free_clk_master_bus;
1559 	}
1560 
1561 	ret = clk_get_by_name(dev, "ptp_ref", &eqos->clk_ptp_ref);
1562 	if (ret) {
1563 		pr_err("clk_get_by_name(ptp_ref) failed: %d", ret);
1564 		goto err_free_clk_rx;
1565 		return ret;
1566 	}
1567 
1568 	ret = clk_get_by_name(dev, "tx", &eqos->clk_tx);
1569 	if (ret) {
1570 		pr_err("clk_get_by_name(tx) failed: %d", ret);
1571 		goto err_free_clk_ptp_ref;
1572 	}
1573 
1574 	debug("%s: OK\n", __func__);
1575 	return 0;
1576 
1577 err_free_clk_ptp_ref:
1578 	clk_free(&eqos->clk_ptp_ref);
1579 err_free_clk_rx:
1580 	clk_free(&eqos->clk_rx);
1581 err_free_clk_master_bus:
1582 	clk_free(&eqos->clk_master_bus);
1583 err_free_clk_slave_bus:
1584 	clk_free(&eqos->clk_slave_bus);
1585 err_free_gpio_phy_reset:
1586 	dm_gpio_free(dev, &eqos->phy_reset_gpio);
1587 err_free_reset_eqos:
1588 	reset_free(&eqos->reset_ctl);
1589 
1590 	debug("%s: returns %d\n", __func__, ret);
1591 	return ret;
1592 }
1593 
1594 /* board-specific Ethernet Interface initializations. */
1595 __weak int board_interface_eth_init(struct udevice *dev,
1596 				    phy_interface_t interface_type)
1597 {
1598 	return 0;
1599 }
1600 
1601 static int eqos_probe_resources_stm32(struct udevice *dev)
1602 {
1603 	struct eqos_priv *eqos = dev_get_priv(dev);
1604 	int ret;
1605 	phy_interface_t interface;
1606 
1607 	debug("%s(dev=%p):\n", __func__, dev);
1608 
1609 	interface = eqos->config->interface(dev);
1610 
1611 	if (interface == PHY_INTERFACE_MODE_NONE) {
1612 		pr_err("Invalid PHY interface\n");
1613 		return -EINVAL;
1614 	}
1615 
1616 	ret = board_interface_eth_init(dev, interface);
1617 	if (ret)
1618 		return -EINVAL;
1619 
1620 	ret = clk_get_by_name(dev, "stmmaceth", &eqos->clk_master_bus);
1621 	if (ret) {
1622 		pr_err("clk_get_by_name(master_bus) failed: %d", ret);
1623 		goto err_probe;
1624 	}
1625 
1626 	ret = clk_get_by_name(dev, "mac-clk-rx", &eqos->clk_rx);
1627 	if (ret) {
1628 		pr_err("clk_get_by_name(rx) failed: %d", ret);
1629 		goto err_free_clk_master_bus;
1630 	}
1631 
1632 	ret = clk_get_by_name(dev, "mac-clk-tx", &eqos->clk_tx);
1633 	if (ret) {
1634 		pr_err("clk_get_by_name(tx) failed: %d", ret);
1635 		goto err_free_clk_rx;
1636 	}
1637 
1638 	/*  Get ETH_CLK clocks (optional) */
1639 	ret = clk_get_by_name(dev, "eth-ck", &eqos->clk_ck);
1640 	if (ret)
1641 		pr_warn("No phy clock provided %d", ret);
1642 
1643 	debug("%s: OK\n", __func__);
1644 	return 0;
1645 
1646 err_free_clk_rx:
1647 	clk_free(&eqos->clk_rx);
1648 err_free_clk_master_bus:
1649 	clk_free(&eqos->clk_master_bus);
1650 err_probe:
1651 
1652 	debug("%s: returns %d\n", __func__, ret);
1653 	return ret;
1654 }
1655 
1656 static phy_interface_t eqos_get_interface_stm32(struct udevice *dev)
1657 {
1658 	const char *phy_mode;
1659 	phy_interface_t interface = PHY_INTERFACE_MODE_NONE;
1660 
1661 	debug("%s(dev=%p):\n", __func__, dev);
1662 
1663 	phy_mode = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "phy-mode",
1664 			       NULL);
1665 	if (phy_mode)
1666 		interface = phy_get_interface_by_name(phy_mode);
1667 
1668 	return interface;
1669 }
1670 
1671 static phy_interface_t eqos_get_interface_tegra186(struct udevice *dev)
1672 {
1673 	return PHY_INTERFACE_MODE_MII;
1674 }
1675 
1676 static int eqos_remove_resources_tegra186(struct udevice *dev)
1677 {
1678 	struct eqos_priv *eqos = dev_get_priv(dev);
1679 
1680 	debug("%s(dev=%p):\n", __func__, dev);
1681 
1682 	clk_free(&eqos->clk_tx);
1683 	clk_free(&eqos->clk_ptp_ref);
1684 	clk_free(&eqos->clk_rx);
1685 	clk_free(&eqos->clk_slave_bus);
1686 	clk_free(&eqos->clk_master_bus);
1687 	dm_gpio_free(dev, &eqos->phy_reset_gpio);
1688 	reset_free(&eqos->reset_ctl);
1689 
1690 	debug("%s: OK\n", __func__);
1691 	return 0;
1692 }
1693 
1694 static int eqos_remove_resources_stm32(struct udevice *dev)
1695 {
1696 	struct eqos_priv *eqos = dev_get_priv(dev);
1697 
1698 	debug("%s(dev=%p):\n", __func__, dev);
1699 
1700 	clk_free(&eqos->clk_tx);
1701 	clk_free(&eqos->clk_rx);
1702 	clk_free(&eqos->clk_master_bus);
1703 	if (clk_valid(&eqos->clk_ck))
1704 		clk_free(&eqos->clk_ck);
1705 
1706 	debug("%s: OK\n", __func__);
1707 	return 0;
1708 }
1709 
1710 static int eqos_probe(struct udevice *dev)
1711 {
1712 	struct eqos_priv *eqos = dev_get_priv(dev);
1713 	int ret;
1714 
1715 	debug("%s(dev=%p):\n", __func__, dev);
1716 
1717 	eqos->dev = dev;
1718 	eqos->config = (void *)dev_get_driver_data(dev);
1719 
1720 	eqos->regs = devfdt_get_addr(dev);
1721 	if (eqos->regs == FDT_ADDR_T_NONE) {
1722 		pr_err("devfdt_get_addr() failed");
1723 		return -ENODEV;
1724 	}
1725 	eqos->mac_regs = (void *)(eqos->regs + EQOS_MAC_REGS_BASE);
1726 	eqos->mtl_regs = (void *)(eqos->regs + EQOS_MTL_REGS_BASE);
1727 	eqos->dma_regs = (void *)(eqos->regs + EQOS_DMA_REGS_BASE);
1728 	eqos->tegra186_regs = (void *)(eqos->regs + EQOS_TEGRA186_REGS_BASE);
1729 
1730 	ret = eqos_probe_resources_core(dev);
1731 	if (ret < 0) {
1732 		pr_err("eqos_probe_resources_core() failed: %d", ret);
1733 		return ret;
1734 	}
1735 
1736 	ret = eqos->config->ops->eqos_probe_resources(dev);
1737 	if (ret < 0) {
1738 		pr_err("eqos_probe_resources() failed: %d", ret);
1739 		goto err_remove_resources_core;
1740 	}
1741 
1742 	eqos->mii = mdio_alloc();
1743 	if (!eqos->mii) {
1744 		pr_err("mdio_alloc() failed");
1745 		ret = -ENOMEM;
1746 		goto err_remove_resources_tegra;
1747 	}
1748 	eqos->mii->read = eqos_mdio_read;
1749 	eqos->mii->write = eqos_mdio_write;
1750 	eqos->mii->priv = eqos;
1751 	strcpy(eqos->mii->name, dev->name);
1752 
1753 	ret = mdio_register(eqos->mii);
1754 	if (ret < 0) {
1755 		pr_err("mdio_register() failed: %d", ret);
1756 		goto err_free_mdio;
1757 	}
1758 
1759 	debug("%s: OK\n", __func__);
1760 	return 0;
1761 
1762 err_free_mdio:
1763 	mdio_free(eqos->mii);
1764 err_remove_resources_tegra:
1765 	eqos->config->ops->eqos_remove_resources(dev);
1766 err_remove_resources_core:
1767 	eqos_remove_resources_core(dev);
1768 
1769 	debug("%s: returns %d\n", __func__, ret);
1770 	return ret;
1771 }
1772 
1773 static int eqos_remove(struct udevice *dev)
1774 {
1775 	struct eqos_priv *eqos = dev_get_priv(dev);
1776 
1777 	debug("%s(dev=%p):\n", __func__, dev);
1778 
1779 	mdio_unregister(eqos->mii);
1780 	mdio_free(eqos->mii);
1781 	eqos->config->ops->eqos_remove_resources(dev);
1782 
1783 	eqos_probe_resources_core(dev);
1784 
1785 	debug("%s: OK\n", __func__);
1786 	return 0;
1787 }
1788 
1789 static const struct eth_ops eqos_ops = {
1790 	.start = eqos_start,
1791 	.stop = eqos_stop,
1792 	.send = eqos_send,
1793 	.recv = eqos_recv,
1794 	.free_pkt = eqos_free_pkt,
1795 	.write_hwaddr = eqos_write_hwaddr,
1796 };
1797 
1798 static struct eqos_ops eqos_tegra186_ops = {
1799 	.eqos_inval_desc = eqos_inval_desc_tegra186,
1800 	.eqos_flush_desc = eqos_flush_desc_tegra186,
1801 	.eqos_inval_buffer = eqos_inval_buffer_tegra186,
1802 	.eqos_flush_buffer = eqos_flush_buffer_tegra186,
1803 	.eqos_probe_resources = eqos_probe_resources_tegra186,
1804 	.eqos_remove_resources = eqos_remove_resources_tegra186,
1805 	.eqos_stop_resets = eqos_stop_resets_tegra186,
1806 	.eqos_start_resets = eqos_start_resets_tegra186,
1807 	.eqos_stop_clks = eqos_stop_clks_tegra186,
1808 	.eqos_start_clks = eqos_start_clks_tegra186,
1809 	.eqos_calibrate_pads = eqos_calibrate_pads_tegra186,
1810 	.eqos_disable_calibration = eqos_disable_calibration_tegra186,
1811 	.eqos_set_tx_clk_speed = eqos_set_tx_clk_speed_tegra186,
1812 	.eqos_get_tick_clk_rate = eqos_get_tick_clk_rate_tegra186
1813 };
1814 
1815 static const struct eqos_config eqos_tegra186_config = {
1816 	.reg_access_always_ok = false,
1817 	.mdio_wait = 10,
1818 	.swr_wait = 10,
1819 	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB,
1820 	.config_mac_mdio = EQOS_MAC_MDIO_ADDRESS_CR_20_35,
1821 	.interface = eqos_get_interface_tegra186,
1822 	.ops = &eqos_tegra186_ops
1823 };
1824 
1825 static struct eqos_ops eqos_stm32_ops = {
1826 	.eqos_inval_desc = eqos_inval_desc_stm32,
1827 	.eqos_flush_desc = eqos_flush_desc_stm32,
1828 	.eqos_inval_buffer = eqos_inval_buffer_stm32,
1829 	.eqos_flush_buffer = eqos_flush_buffer_stm32,
1830 	.eqos_probe_resources = eqos_probe_resources_stm32,
1831 	.eqos_remove_resources = eqos_remove_resources_stm32,
1832 	.eqos_stop_resets = eqos_stop_resets_stm32,
1833 	.eqos_start_resets = eqos_start_resets_stm32,
1834 	.eqos_stop_clks = eqos_stop_clks_stm32,
1835 	.eqos_start_clks = eqos_start_clks_stm32,
1836 	.eqos_calibrate_pads = eqos_calibrate_pads_stm32,
1837 	.eqos_disable_calibration = eqos_disable_calibration_stm32,
1838 	.eqos_set_tx_clk_speed = eqos_set_tx_clk_speed_stm32,
1839 	.eqos_get_tick_clk_rate = eqos_get_tick_clk_rate_stm32
1840 };
1841 
1842 static const struct eqos_config eqos_stm32_config = {
1843 	.reg_access_always_ok = false,
1844 	.mdio_wait = 10000,
1845 	.swr_wait = 50,
1846 	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV,
1847 	.config_mac_mdio = EQOS_MAC_MDIO_ADDRESS_CR_250_300,
1848 	.interface = eqos_get_interface_stm32,
1849 	.ops = &eqos_stm32_ops
1850 };
1851 
1852 static const struct udevice_id eqos_ids[] = {
1853 	{
1854 		.compatible = "nvidia,tegra186-eqos",
1855 		.data = (ulong)&eqos_tegra186_config
1856 	},
1857 	{
1858 		.compatible = "snps,dwmac-4.20a",
1859 		.data = (ulong)&eqos_stm32_config
1860 	},
1861 
1862 	{ }
1863 };
1864 
1865 U_BOOT_DRIVER(eth_eqos) = {
1866 	.name = "eth_eqos",
1867 	.id = UCLASS_ETH,
1868 	.of_match = eqos_ids,
1869 	.probe = eqos_probe,
1870 	.remove = eqos_remove,
1871 	.ops = &eqos_ops,
1872 	.priv_auto_alloc_size = sizeof(struct eqos_priv),
1873 	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
1874 };
1875