summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/qualcomm/emac/emac-sgmii-qdf2400.c
blob: 5b8419498ef16b984a45e060b6e7b54d999621ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

/* Qualcomm Technologies, Inc. QDF2400 EMAC SGMII Controller driver.
 */

#include <linux/iopoll.h>
#include "emac.h"

/* EMAC_SGMII register offsets */
#define EMAC_SGMII_PHY_TX_PWR_CTRL		0x000C
#define EMAC_SGMII_PHY_LANE_CTRL1		0x0018
#define EMAC_SGMII_PHY_CDR_CTRL0		0x0058
#define EMAC_SGMII_PHY_POW_DWN_CTRL0		0x0080
#define EMAC_SGMII_PHY_RESET_CTRL		0x00a8
#define EMAC_SGMII_PHY_INTERRUPT_MASK		0x00b4

/* SGMII digital lane registers */
#define EMAC_SGMII_LN_DRVR_CTRL0		0x000C
#define EMAC_SGMII_LN_DRVR_TAP_EN		0x0018
#define EMAC_SGMII_LN_TX_MARGINING		0x001C
#define EMAC_SGMII_LN_TX_PRE			0x0020
#define EMAC_SGMII_LN_TX_POST			0x0024
#define EMAC_SGMII_LN_TX_BAND_MODE		0x0060
#define EMAC_SGMII_LN_LANE_MODE			0x0064
#define EMAC_SGMII_LN_PARALLEL_RATE		0x007C
#define EMAC_SGMII_LN_CML_CTRL_MODE0		0x00C0
#define EMAC_SGMII_LN_MIXER_CTRL_MODE0		0x00D8
#define EMAC_SGMII_LN_VGA_INITVAL		0x013C
#define EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0	0x0184
#define EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0	0x0190
#define EMAC_SGMII_LN_UCDR_SO_CONFIG		0x019C
#define EMAC_SGMII_LN_RX_BAND			0x01A4
#define EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0	0x01C0
#define EMAC_SGMII_LN_RSM_CONFIG		0x01F8
#define EMAC_SGMII_LN_SIGDET_ENABLES		0x0230
#define EMAC_SGMII_LN_SIGDET_CNTRL		0x0234
#define EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL	0x0238
#define EMAC_SGMII_LN_RX_EN_SIGNAL		0x02AC
#define EMAC_SGMII_LN_RX_MISC_CNTRL0		0x02B8
#define EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV		0x02C8

/* SGMII digital lane register values */
#define UCDR_STEP_BY_TWO_MODE0			BIT(7)
#define UCDR_xO_GAIN_MODE(x)			((x) & 0x7f)
#define UCDR_ENABLE				BIT(6)
#define UCDR_SO_SATURATION(x)			((x) & 0x3f)

#define SIGDET_LP_BYP_PS4			BIT(7)
#define SIGDET_EN_PS0_TO_PS2			BIT(6)

#define TXVAL_VALID_INIT			BIT(4)
#define KR_PCIGEN3_MODE				BIT(0)

#define MAIN_EN					BIT(0)

#define TX_MARGINING_MUX			BIT(6)
#define TX_MARGINING(x)				((x) & 0x3f)

#define TX_PRE_MUX				BIT(6)

#define TX_POST_MUX				BIT(6)

#define CML_GEAR_MODE(x)			(((x) & 7) << 3)
#define CML2CMOS_IBOOST_MODE(x)			((x) & 7)

#define MIXER_LOADB_MODE(x)			(((x) & 0xf) << 2)
#define MIXER_DATARATE_MODE(x)			((x) & 3)

#define VGA_THRESH_DFE(x)			((x) & 0x3f)

#define SIGDET_LP_BYP_PS0_TO_PS2		BIT(5)
#define SIGDET_FLT_BYP				BIT(0)

#define SIGDET_LVL(x)				(((x) & 0xf) << 4)

#define SIGDET_DEGLITCH_CTRL(x)			(((x) & 0xf) << 1)

#define INVERT_PCS_RX_CLK			BIT(7)

#define DRVR_LOGIC_CLK_EN			BIT(4)
#define DRVR_LOGIC_CLK_DIV(x)			((x) & 0xf)

#define PARALLEL_RATE_MODE0(x)			((x) & 0x3)

#define BAND_MODE0(x)				((x) & 0x3)

#define LANE_MODE(x)				((x) & 0x1f)

#define CDR_PD_SEL_MODE0(x)			(((x) & 0x3) << 5)
#define EN_DLL_MODE0				BIT(4)
#define EN_IQ_DCC_MODE0				BIT(3)
#define EN_IQCAL_MODE0				BIT(2)

#define BYPASS_RSM_SAMP_CAL			BIT(1)
#define BYPASS_RSM_DLL_CAL			BIT(0)

#define L0_RX_EQUALIZE_ENABLE			BIT(6)

#define PWRDN_B					BIT(0)

#define CDR_MAX_CNT(x)				((x) & 0xff)

#define SERDES_START_WAIT_TIMES			100

struct emac_reg_write {
	unsigned int offset;
	u32 val;
};

static void emac_reg_write_all(void __iomem *base,
			       const struct emac_reg_write *itr, size_t size)
{
	size_t i;

	for (i = 0; i < size; ++itr, ++i)
		writel(itr->val, base + itr->offset);
}

static const struct emac_reg_write sgmii_laned[] = {
	/* CDR Settings */
	{EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0,
		UCDR_STEP_BY_TWO_MODE0 | UCDR_xO_GAIN_MODE(10)},
	{EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0, UCDR_xO_GAIN_MODE(0)},
	{EMAC_SGMII_LN_UCDR_SO_CONFIG, UCDR_ENABLE | UCDR_SO_SATURATION(12)},

	/* TX/RX Settings */
	{EMAC_SGMII_LN_RX_EN_SIGNAL, SIGDET_LP_BYP_PS4 | SIGDET_EN_PS0_TO_PS2},

	{EMAC_SGMII_LN_DRVR_CTRL0, TXVAL_VALID_INIT | KR_PCIGEN3_MODE},
	{EMAC_SGMII_LN_DRVR_TAP_EN, MAIN_EN},
	{EMAC_SGMII_LN_TX_MARGINING, TX_MARGINING_MUX | TX_MARGINING(25)},
	{EMAC_SGMII_LN_TX_PRE, TX_PRE_MUX},
	{EMAC_SGMII_LN_TX_POST, TX_POST_MUX},

	{EMAC_SGMII_LN_CML_CTRL_MODE0,
		CML_GEAR_MODE(1) | CML2CMOS_IBOOST_MODE(1)},
	{EMAC_SGMII_LN_MIXER_CTRL_MODE0,
		MIXER_LOADB_MODE(12) | MIXER_DATARATE_MODE(1)},
	{EMAC_SGMII_LN_VGA_INITVAL, VGA_THRESH_DFE(31)},
	{EMAC_SGMII_LN_SIGDET_ENABLES,
		SIGDET_LP_BYP_PS0_TO_PS2 | SIGDET_FLT_BYP},
	{EMAC_SGMII_LN_SIGDET_CNTRL, SIGDET_LVL(8)},

	{EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL, SIGDET_DEGLITCH_CTRL(4)},
	{EMAC_SGMII_LN_RX_MISC_CNTRL0, INVERT_PCS_RX_CLK},
	{EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV,
		DRVR_LOGIC_CLK_EN | DRVR_LOGIC_CLK_DIV(4)},

	{EMAC_SGMII_LN_PARALLEL_RATE, PARALLEL_RATE_MODE0(1)},
	{EMAC_SGMII_LN_TX_BAND_MODE, BAND_MODE0(1)},
	{EMAC_SGMII_LN_RX_BAND, BAND_MODE0(2)},
	{EMAC_SGMII_LN_LANE_MODE, LANE_MODE(26)},
	{EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0, CDR_PD_SEL_MODE0(2) |
		EN_DLL_MODE0 | EN_IQ_DCC_MODE0 | EN_IQCAL_MODE0},
	{EMAC_SGMII_LN_RSM_CONFIG, BYPASS_RSM_SAMP_CAL | BYPASS_RSM_DLL_CAL},
};

static const struct emac_reg_write physical_coding_sublayer_programming[] = {
	{EMAC_SGMII_PHY_POW_DWN_CTRL0, PWRDN_B},
	{EMAC_SGMII_PHY_CDR_CTRL0, CDR_MAX_CNT(15)},
	{EMAC_SGMII_PHY_TX_PWR_CTRL, 0},
	{EMAC_SGMII_PHY_LANE_CTRL1, L0_RX_EQUALIZE_ENABLE},
};

int emac_sgmii_init_qdf2400(struct emac_adapter *adpt)
{
	struct emac_phy *phy = &adpt->phy;
	void __iomem *phy_regs = phy->base;
	void __iomem *laned = phy->digital;
	unsigned int i;
	u32 lnstatus;

	/* PCS lane-x init */
	emac_reg_write_all(phy->base, physical_coding_sublayer_programming,
			   ARRAY_SIZE(physical_coding_sublayer_programming));

	/* SGMII lane-x init */
	emac_reg_write_all(phy->digital, sgmii_laned, ARRAY_SIZE(sgmii_laned));

	/* Power up PCS and start reset lane state machine */

	writel(0, phy_regs + EMAC_SGMII_PHY_RESET_CTRL);
	writel(1, laned + SGMII_LN_RSM_START);

	/* Wait for c_ready assertion */
	for (i = 0; i < SERDES_START_WAIT_TIMES; i++) {
		lnstatus = readl(phy_regs + SGMII_PHY_LN_LANE_STATUS);
		if (lnstatus & BIT(1))
			break;
		usleep_range(100, 200);
	}

	if (i == SERDES_START_WAIT_TIMES) {
		netdev_err(adpt->netdev, "SGMII failed to start\n");
		return -EIO;
	}

	/* Disable digital and SERDES loopback */
	writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN0);
	writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN2);
	writel(0, phy_regs + SGMII_PHY_LN_CDR_CTRL1);

	/* Mask out all the SGMII Interrupt */
	writel(0, phy_regs + EMAC_SGMII_PHY_INTERRUPT_MASK);

	return 0;
}