1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
3 */
4
5 /* Qualcomm Technologies, Inc. QDF2400 EMAC SGMII Controller driver.
6 */
7
8 #include <linux/iopoll.h>
9 #include "emac.h"
10
11 /* EMAC_SGMII register offsets */
12 #define EMAC_SGMII_PHY_TX_PWR_CTRL 0x000C
13 #define EMAC_SGMII_PHY_LANE_CTRL1 0x0018
14 #define EMAC_SGMII_PHY_CDR_CTRL0 0x0058
15 #define EMAC_SGMII_PHY_POW_DWN_CTRL0 0x0080
16 #define EMAC_SGMII_PHY_RESET_CTRL 0x00a8
17 #define EMAC_SGMII_PHY_INTERRUPT_MASK 0x00b4
18
19 /* SGMII digital lane registers */
20 #define EMAC_SGMII_LN_DRVR_CTRL0 0x000C
21 #define EMAC_SGMII_LN_DRVR_CTRL1 0x0010
22 #define EMAC_SGMII_LN_DRVR_TAP_EN 0x0018
23 #define EMAC_SGMII_LN_TX_MARGINING 0x001C
24 #define EMAC_SGMII_LN_TX_PRE 0x0020
25 #define EMAC_SGMII_LN_TX_POST 0x0024
26 #define EMAC_SGMII_LN_TX_BAND_MODE 0x0060
27 #define EMAC_SGMII_LN_LANE_MODE 0x0064
28 #define EMAC_SGMII_LN_PARALLEL_RATE 0x007C
29 #define EMAC_SGMII_LN_CML_CTRL_MODE0 0x00C0
30 #define EMAC_SGMII_LN_MIXER_CTRL_MODE0 0x00D8
31 #define EMAC_SGMII_LN_VGA_INITVAL 0x013C
32 #define EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0 0x0184
33 #define EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0 0x0190
34 #define EMAC_SGMII_LN_UCDR_SO_CONFIG 0x019C
35 #define EMAC_SGMII_LN_RX_BAND 0x01A4
36 #define EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0 0x01C0
37 #define EMAC_SGMII_LN_RSM_CONFIG 0x01F8
38 #define EMAC_SGMII_LN_SIGDET_ENABLES 0x0230
39 #define EMAC_SGMII_LN_SIGDET_CNTRL 0x0234
40 #define EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL 0x0238
41 #define EMAC_SGMII_LN_RX_EN_SIGNAL 0x02AC
42 #define EMAC_SGMII_LN_RX_MISC_CNTRL0 0x02B8
43 #define EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV 0x02C8
44 #define EMAC_SGMII_LN_RX_RESECODE_OFFSET 0x02CC
45
46 /* SGMII digital lane register values */
47 #define UCDR_STEP_BY_TWO_MODE0 BIT(7)
48 #define UCDR_xO_GAIN_MODE(x) ((x) & 0x7f)
49 #define UCDR_ENABLE BIT(6)
50 #define UCDR_SO_SATURATION(x) ((x) & 0x3f)
51
52 #define SIGDET_LP_BYP_PS4 BIT(7)
53 #define SIGDET_EN_PS0_TO_PS2 BIT(6)
54
55 #define TXVAL_VALID_INIT BIT(4)
56 #define KR_PCIGEN3_MODE BIT(0)
57
58 #define MAIN_EN BIT(0)
59
60 #define TX_MARGINING_MUX BIT(6)
61 #define TX_MARGINING(x) ((x) & 0x3f)
62
63 #define TX_PRE_MUX BIT(6)
64
65 #define TX_POST_MUX BIT(6)
66
67 #define CML_GEAR_MODE(x) (((x) & 7) << 3)
68 #define CML2CMOS_IBOOST_MODE(x) ((x) & 7)
69
70 #define RESCODE_OFFSET(x) ((x) & 0x1f)
71
72 #define MIXER_LOADB_MODE(x) (((x) & 0xf) << 2)
73 #define MIXER_DATARATE_MODE(x) ((x) & 3)
74
75 #define VGA_THRESH_DFE(x) ((x) & 0x3f)
76
77 #define SIGDET_LP_BYP_PS0_TO_PS2 BIT(5)
78 #define SIGDET_FLT_BYP BIT(0)
79
80 #define SIGDET_LVL(x) (((x) & 0xf) << 4)
81
82 #define SIGDET_DEGLITCH_CTRL(x) (((x) & 0xf) << 1)
83
84 #define INVERT_PCS_RX_CLK BIT(7)
85
86 #define DRVR_LOGIC_CLK_EN BIT(4)
87 #define DRVR_LOGIC_CLK_DIV(x) ((x) & 0xf)
88
89 #define PARALLEL_RATE_MODE0(x) ((x) & 0x3)
90
91 #define BAND_MODE0(x) ((x) & 0x3)
92
93 #define LANE_MODE(x) ((x) & 0x1f)
94
95 #define CDR_PD_SEL_MODE0(x) (((x) & 0x3) << 5)
96 #define EN_DLL_MODE0 BIT(4)
97 #define EN_IQ_DCC_MODE0 BIT(3)
98 #define EN_IQCAL_MODE0 BIT(2)
99
100 #define BYPASS_RSM_SAMP_CAL BIT(1)
101 #define BYPASS_RSM_DLL_CAL BIT(0)
102
103 #define L0_RX_EQUALIZE_ENABLE BIT(6)
104
105 #define PWRDN_B BIT(0)
106
107 #define CDR_MAX_CNT(x) ((x) & 0xff)
108
109 #define SERDES_START_WAIT_TIMES 100
110
111 struct emac_reg_write {
112 unsigned int offset;
113 u32 val;
114 };
115
emac_reg_write_all(void __iomem * base,const struct emac_reg_write * itr,size_t size)116 static void emac_reg_write_all(void __iomem *base,
117 const struct emac_reg_write *itr, size_t size)
118 {
119 size_t i;
120
121 for (i = 0; i < size; ++itr, ++i)
122 writel(itr->val, base + itr->offset);
123 }
124
125 static const struct emac_reg_write sgmii_laned[] = {
126 /* CDR Settings */
127 {EMAC_SGMII_LN_UCDR_FO_GAIN_MODE0,
128 UCDR_STEP_BY_TWO_MODE0 | UCDR_xO_GAIN_MODE(10)},
129 {EMAC_SGMII_LN_UCDR_SO_GAIN_MODE0, UCDR_xO_GAIN_MODE(0)},
130 {EMAC_SGMII_LN_UCDR_SO_CONFIG, UCDR_ENABLE | UCDR_SO_SATURATION(12)},
131
132 /* TX/RX Settings */
133 {EMAC_SGMII_LN_RX_EN_SIGNAL, SIGDET_LP_BYP_PS4 | SIGDET_EN_PS0_TO_PS2},
134
135 {EMAC_SGMII_LN_DRVR_CTRL0, TXVAL_VALID_INIT | KR_PCIGEN3_MODE},
136 {EMAC_SGMII_LN_DRVR_TAP_EN, MAIN_EN},
137 {EMAC_SGMII_LN_TX_MARGINING, TX_MARGINING_MUX | TX_MARGINING(25)},
138 {EMAC_SGMII_LN_TX_PRE, TX_PRE_MUX},
139 {EMAC_SGMII_LN_TX_POST, TX_POST_MUX},
140
141 {EMAC_SGMII_LN_CML_CTRL_MODE0,
142 CML_GEAR_MODE(1) | CML2CMOS_IBOOST_MODE(1)},
143 {EMAC_SGMII_LN_MIXER_CTRL_MODE0,
144 MIXER_LOADB_MODE(12) | MIXER_DATARATE_MODE(1)},
145 {EMAC_SGMII_LN_VGA_INITVAL, VGA_THRESH_DFE(31)},
146 {EMAC_SGMII_LN_SIGDET_ENABLES,
147 SIGDET_LP_BYP_PS0_TO_PS2 | SIGDET_FLT_BYP},
148 {EMAC_SGMII_LN_SIGDET_CNTRL, SIGDET_LVL(8)},
149
150 {EMAC_SGMII_LN_SIGDET_DEGLITCH_CNTRL, SIGDET_DEGLITCH_CTRL(4)},
151 {EMAC_SGMII_LN_RX_MISC_CNTRL0, INVERT_PCS_RX_CLK},
152 {EMAC_SGMII_LN_DRVR_LOGIC_CLKDIV,
153 DRVR_LOGIC_CLK_EN | DRVR_LOGIC_CLK_DIV(4)},
154
155 {EMAC_SGMII_LN_PARALLEL_RATE, PARALLEL_RATE_MODE0(1)},
156 {EMAC_SGMII_LN_TX_BAND_MODE, BAND_MODE0(1)},
157 {EMAC_SGMII_LN_RX_BAND, BAND_MODE0(2)},
158 {EMAC_SGMII_LN_DRVR_CTRL1, RESCODE_OFFSET(7)},
159 {EMAC_SGMII_LN_RX_RESECODE_OFFSET, RESCODE_OFFSET(9)},
160 {EMAC_SGMII_LN_LANE_MODE, LANE_MODE(26)},
161 {EMAC_SGMII_LN_RX_RCVR_PATH1_MODE0, CDR_PD_SEL_MODE0(2) |
162 EN_DLL_MODE0 | EN_IQ_DCC_MODE0 | EN_IQCAL_MODE0},
163 {EMAC_SGMII_LN_RSM_CONFIG, BYPASS_RSM_SAMP_CAL | BYPASS_RSM_DLL_CAL},
164 };
165
166 static const struct emac_reg_write physical_coding_sublayer_programming[] = {
167 {EMAC_SGMII_PHY_POW_DWN_CTRL0, PWRDN_B},
168 {EMAC_SGMII_PHY_CDR_CTRL0, CDR_MAX_CNT(15)},
169 {EMAC_SGMII_PHY_TX_PWR_CTRL, 0},
170 {EMAC_SGMII_PHY_LANE_CTRL1, L0_RX_EQUALIZE_ENABLE},
171 };
172
emac_sgmii_init_qdf2400(struct emac_adapter * adpt)173 int emac_sgmii_init_qdf2400(struct emac_adapter *adpt)
174 {
175 struct emac_sgmii *phy = &adpt->phy;
176 void __iomem *phy_regs = phy->base;
177 void __iomem *laned = phy->digital;
178 unsigned int i;
179 u32 lnstatus;
180
181 /* PCS lane-x init */
182 emac_reg_write_all(phy->base, physical_coding_sublayer_programming,
183 ARRAY_SIZE(physical_coding_sublayer_programming));
184
185 /* SGMII lane-x init */
186 emac_reg_write_all(phy->digital, sgmii_laned, ARRAY_SIZE(sgmii_laned));
187
188 /* Power up PCS and start reset lane state machine */
189
190 writel(0, phy_regs + EMAC_SGMII_PHY_RESET_CTRL);
191 writel(1, laned + SGMII_LN_RSM_START);
192
193 /* Wait for c_ready assertion */
194 for (i = 0; i < SERDES_START_WAIT_TIMES; i++) {
195 lnstatus = readl(phy_regs + SGMII_PHY_LN_LANE_STATUS);
196 if (lnstatus & BIT(1))
197 break;
198 usleep_range(100, 200);
199 }
200
201 if (i == SERDES_START_WAIT_TIMES) {
202 netdev_err(adpt->netdev, "SGMII failed to start\n");
203 return -EIO;
204 }
205
206 /* Disable digital and SERDES loopback */
207 writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN0);
208 writel(0, phy_regs + SGMII_PHY_LN_BIST_GEN2);
209 writel(0, phy_regs + SGMII_PHY_LN_CDR_CTRL1);
210
211 /* Mask out all the SGMII Interrupt */
212 writel(0, phy_regs + EMAC_SGMII_PHY_INTERRUPT_MASK);
213
214 return 0;
215 }
216