1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2015 - 2023 Beijing WangXun Technology Co., Ltd. */
3
4 #include <linux/pcs/pcs-xpcs.h>
5 #include <linux/mdio.h>
6 #include "pcs-xpcs.h"
7
8 /* VR_XS_PMA_MMD */
9 #define TXGBE_PMA_MMD 0x8020
10 #define TXGBE_TX_GENCTL1 0x11
11 #define TXGBE_TX_GENCTL1_VBOOST_LVL GENMASK(10, 8)
12 #define TXGBE_TX_GENCTL1_VBOOST_EN0 BIT(4)
13 #define TXGBE_TX_GEN_CTL2 0x12
14 #define TXGBE_TX_GEN_CTL2_TX0_WIDTH(v) FIELD_PREP(GENMASK(9, 8), v)
15 #define TXGBE_TX_RATE_CTL 0x14
16 #define TXGBE_TX_RATE_CTL_TX0_RATE(v) FIELD_PREP(GENMASK(2, 0), v)
17 #define TXGBE_RX_GEN_CTL2 0x32
18 #define TXGBE_RX_GEN_CTL2_RX0_WIDTH(v) FIELD_PREP(GENMASK(9, 8), v)
19 #define TXGBE_RX_GEN_CTL3 0x33
20 #define TXGBE_RX_GEN_CTL3_LOS_TRSHLD0 GENMASK(2, 0)
21 #define TXGBE_RX_RATE_CTL 0x34
22 #define TXGBE_RX_RATE_CTL_RX0_RATE(v) FIELD_PREP(GENMASK(1, 0), v)
23 #define TXGBE_RX_EQ_ATTN_CTL 0x37
24 #define TXGBE_RX_EQ_ATTN_LVL0 GENMASK(2, 0)
25 #define TXGBE_RX_EQ_CTL0 0x38
26 #define TXGBE_RX_EQ_CTL0_VGA1_GAIN(v) FIELD_PREP(GENMASK(15, 12), v)
27 #define TXGBE_RX_EQ_CTL0_VGA2_GAIN(v) FIELD_PREP(GENMASK(11, 8), v)
28 #define TXGBE_RX_EQ_CTL0_CTLE_POLE(v) FIELD_PREP(GENMASK(7, 5), v)
29 #define TXGBE_RX_EQ_CTL0_CTLE_BOOST(v) FIELD_PREP(GENMASK(4, 0), v)
30 #define TXGBE_RX_EQ_CTL4 0x3C
31 #define TXGBE_RX_EQ_CTL4_CONT_OFF_CAN0 BIT(4)
32 #define TXGBE_RX_EQ_CTL4_CONT_ADAPT0 BIT(0)
33 #define TXGBE_AFE_DFE_ENABLE 0x3D
34 #define TXGBE_DFE_EN_0 BIT(4)
35 #define TXGBE_AFE_EN_0 BIT(0)
36 #define TXGBE_DFE_TAP_CTL0 0x3E
37 #define TXGBE_MPLLA_CTL0 0x51
38 #define TXGBE_MPLLA_CTL2 0x53
39 #define TXGBE_MPLLA_CTL2_DIV16P5_CLK_EN BIT(10)
40 #define TXGBE_MPLLA_CTL2_DIV10_CLK_EN BIT(9)
41 #define TXGBE_MPLLA_CTL3 0x57
42 #define TXGBE_MISC_CTL0 0x70
43 #define TXGBE_MISC_CTL0_PLL BIT(15)
44 #define TXGBE_MISC_CTL0_CR_PARA_SEL BIT(14)
45 #define TXGBE_MISC_CTL0_RX_VREF(v) FIELD_PREP(GENMASK(12, 8), v)
46 #define TXGBE_VCO_CAL_LD0 0x72
47 #define TXGBE_VCO_CAL_REF0 0x76
48
txgbe_read_pma(struct dw_xpcs * xpcs,int reg)49 static int txgbe_read_pma(struct dw_xpcs *xpcs, int reg)
50 {
51 return xpcs_read(xpcs, MDIO_MMD_PMAPMD, TXGBE_PMA_MMD + reg);
52 }
53
txgbe_write_pma(struct dw_xpcs * xpcs,int reg,u16 val)54 static int txgbe_write_pma(struct dw_xpcs *xpcs, int reg, u16 val)
55 {
56 return xpcs_write(xpcs, MDIO_MMD_PMAPMD, TXGBE_PMA_MMD + reg, val);
57 }
58
txgbe_pma_config_10gbaser(struct dw_xpcs * xpcs)59 static void txgbe_pma_config_10gbaser(struct dw_xpcs *xpcs)
60 {
61 int val;
62
63 txgbe_write_pma(xpcs, TXGBE_MPLLA_CTL0, 0x21);
64 txgbe_write_pma(xpcs, TXGBE_MPLLA_CTL3, 0);
65 val = txgbe_read_pma(xpcs, TXGBE_TX_GENCTL1);
66 val = u16_replace_bits(val, 0x5, TXGBE_TX_GENCTL1_VBOOST_LVL);
67 txgbe_write_pma(xpcs, TXGBE_TX_GENCTL1, val);
68 txgbe_write_pma(xpcs, TXGBE_MISC_CTL0, TXGBE_MISC_CTL0_PLL |
69 TXGBE_MISC_CTL0_CR_PARA_SEL | TXGBE_MISC_CTL0_RX_VREF(0xF));
70 txgbe_write_pma(xpcs, TXGBE_VCO_CAL_LD0, 0x549);
71 txgbe_write_pma(xpcs, TXGBE_VCO_CAL_REF0, 0x29);
72 txgbe_write_pma(xpcs, TXGBE_TX_RATE_CTL, 0);
73 txgbe_write_pma(xpcs, TXGBE_RX_RATE_CTL, 0);
74 txgbe_write_pma(xpcs, TXGBE_TX_GEN_CTL2, TXGBE_TX_GEN_CTL2_TX0_WIDTH(3));
75 txgbe_write_pma(xpcs, TXGBE_RX_GEN_CTL2, TXGBE_RX_GEN_CTL2_RX0_WIDTH(3));
76 txgbe_write_pma(xpcs, TXGBE_MPLLA_CTL2, TXGBE_MPLLA_CTL2_DIV16P5_CLK_EN |
77 TXGBE_MPLLA_CTL2_DIV10_CLK_EN);
78
79 txgbe_write_pma(xpcs, TXGBE_RX_EQ_CTL0, TXGBE_RX_EQ_CTL0_CTLE_POLE(2) |
80 TXGBE_RX_EQ_CTL0_CTLE_BOOST(5));
81 val = txgbe_read_pma(xpcs, TXGBE_RX_EQ_ATTN_CTL);
82 val &= ~TXGBE_RX_EQ_ATTN_LVL0;
83 txgbe_write_pma(xpcs, TXGBE_RX_EQ_ATTN_CTL, val);
84 txgbe_write_pma(xpcs, TXGBE_DFE_TAP_CTL0, 0xBE);
85 val = txgbe_read_pma(xpcs, TXGBE_AFE_DFE_ENABLE);
86 val &= ~(TXGBE_DFE_EN_0 | TXGBE_AFE_EN_0);
87 txgbe_write_pma(xpcs, TXGBE_AFE_DFE_ENABLE, val);
88 val = txgbe_read_pma(xpcs, TXGBE_RX_EQ_CTL4);
89 val &= ~TXGBE_RX_EQ_CTL4_CONT_ADAPT0;
90 txgbe_write_pma(xpcs, TXGBE_RX_EQ_CTL4, val);
91 }
92
txgbe_pma_config_1g(struct dw_xpcs * xpcs)93 static void txgbe_pma_config_1g(struct dw_xpcs *xpcs)
94 {
95 int val;
96
97 val = txgbe_read_pma(xpcs, TXGBE_TX_GENCTL1);
98 val = u16_replace_bits(val, 0x5, TXGBE_TX_GENCTL1_VBOOST_LVL);
99 val &= ~TXGBE_TX_GENCTL1_VBOOST_EN0;
100 txgbe_write_pma(xpcs, TXGBE_TX_GENCTL1, val);
101 txgbe_write_pma(xpcs, TXGBE_MISC_CTL0, TXGBE_MISC_CTL0_PLL |
102 TXGBE_MISC_CTL0_CR_PARA_SEL | TXGBE_MISC_CTL0_RX_VREF(0xF));
103
104 txgbe_write_pma(xpcs, TXGBE_RX_EQ_CTL0, TXGBE_RX_EQ_CTL0_VGA1_GAIN(7) |
105 TXGBE_RX_EQ_CTL0_VGA2_GAIN(7) | TXGBE_RX_EQ_CTL0_CTLE_BOOST(6));
106 val = txgbe_read_pma(xpcs, TXGBE_RX_EQ_ATTN_CTL);
107 val &= ~TXGBE_RX_EQ_ATTN_LVL0;
108 txgbe_write_pma(xpcs, TXGBE_RX_EQ_ATTN_CTL, val);
109 txgbe_write_pma(xpcs, TXGBE_DFE_TAP_CTL0, 0);
110 val = txgbe_read_pma(xpcs, TXGBE_RX_GEN_CTL3);
111 val = u16_replace_bits(val, 0x4, TXGBE_RX_GEN_CTL3_LOS_TRSHLD0);
112 txgbe_write_pma(xpcs, TXGBE_RX_GEN_CTL3, val);
113
114 txgbe_write_pma(xpcs, TXGBE_MPLLA_CTL0, 0x20);
115 txgbe_write_pma(xpcs, TXGBE_MPLLA_CTL3, 0x46);
116 txgbe_write_pma(xpcs, TXGBE_VCO_CAL_LD0, 0x540);
117 txgbe_write_pma(xpcs, TXGBE_VCO_CAL_REF0, 0x2A);
118 txgbe_write_pma(xpcs, TXGBE_AFE_DFE_ENABLE, 0);
119 txgbe_write_pma(xpcs, TXGBE_RX_EQ_CTL4, TXGBE_RX_EQ_CTL4_CONT_OFF_CAN0);
120 txgbe_write_pma(xpcs, TXGBE_TX_RATE_CTL, TXGBE_TX_RATE_CTL_TX0_RATE(3));
121 txgbe_write_pma(xpcs, TXGBE_RX_RATE_CTL, TXGBE_RX_RATE_CTL_RX0_RATE(3));
122 txgbe_write_pma(xpcs, TXGBE_TX_GEN_CTL2, TXGBE_TX_GEN_CTL2_TX0_WIDTH(1));
123 txgbe_write_pma(xpcs, TXGBE_RX_GEN_CTL2, TXGBE_RX_GEN_CTL2_RX0_WIDTH(1));
124 txgbe_write_pma(xpcs, TXGBE_MPLLA_CTL2, TXGBE_MPLLA_CTL2_DIV10_CLK_EN);
125 }
126
txgbe_pcs_poll_power_up(struct dw_xpcs * xpcs)127 static int txgbe_pcs_poll_power_up(struct dw_xpcs *xpcs)
128 {
129 int val, ret;
130
131 /* Wait xpcs power-up good */
132 ret = read_poll_timeout(xpcs_read_vpcs, val,
133 (val & DW_PSEQ_ST) == DW_PSEQ_ST_GOOD,
134 10000, 1000000, false,
135 xpcs, DW_VR_XS_PCS_DIG_STS);
136 if (ret < 0)
137 dev_err(&xpcs->mdiodev->dev, "xpcs power-up timeout\n");
138
139 return ret;
140 }
141
txgbe_pma_init_done(struct dw_xpcs * xpcs)142 static int txgbe_pma_init_done(struct dw_xpcs *xpcs)
143 {
144 int val, ret;
145
146 xpcs_write_vpcs(xpcs, DW_VR_XS_PCS_DIG_CTRL1, DW_VR_RST | DW_EN_VSMMD1);
147
148 /* wait pma initialization done */
149 ret = read_poll_timeout(xpcs_read_vpcs, val, !(val & DW_VR_RST),
150 100000, 10000000, false,
151 xpcs, DW_VR_XS_PCS_DIG_CTRL1);
152 if (ret < 0)
153 dev_err(&xpcs->mdiodev->dev, "xpcs pma initialization timeout\n");
154
155 return ret;
156 }
157
txgbe_xpcs_mode_quirk(struct dw_xpcs * xpcs)158 static bool txgbe_xpcs_mode_quirk(struct dw_xpcs *xpcs)
159 {
160 int ret;
161
162 /* When txgbe do LAN reset, PCS will change to default 10GBASE-R mode */
163 ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_CTRL2);
164 ret &= MDIO_PCS_CTRL2_TYPE;
165 if ((ret == MDIO_PCS_CTRL2_10GBR &&
166 xpcs->interface != PHY_INTERFACE_MODE_10GBASER) ||
167 xpcs->interface == PHY_INTERFACE_MODE_SGMII)
168 return true;
169
170 return false;
171 }
172
txgbe_xpcs_switch_mode(struct dw_xpcs * xpcs,phy_interface_t interface)173 int txgbe_xpcs_switch_mode(struct dw_xpcs *xpcs, phy_interface_t interface)
174 {
175 int val, ret;
176
177 switch (interface) {
178 case PHY_INTERFACE_MODE_10GBASER:
179 case PHY_INTERFACE_MODE_SGMII:
180 case PHY_INTERFACE_MODE_1000BASEX:
181 break;
182 default:
183 return 0;
184 }
185
186 if (xpcs->interface == interface && !txgbe_xpcs_mode_quirk(xpcs))
187 return 0;
188
189 xpcs->interface = interface;
190
191 ret = txgbe_pcs_poll_power_up(xpcs);
192 if (ret < 0)
193 return ret;
194
195 if (interface == PHY_INTERFACE_MODE_10GBASER) {
196 xpcs_write(xpcs, MDIO_MMD_PCS, MDIO_CTRL2, MDIO_PCS_CTRL2_10GBR);
197 val = xpcs_read(xpcs, MDIO_MMD_PMAPMD, MDIO_CTRL1);
198 val |= MDIO_CTRL1_SPEED10G;
199 xpcs_write(xpcs, MDIO_MMD_PMAPMD, MDIO_CTRL1, val);
200 txgbe_pma_config_10gbaser(xpcs);
201 } else {
202 xpcs_write(xpcs, MDIO_MMD_PCS, MDIO_CTRL2, MDIO_PCS_CTRL2_10GBX);
203 xpcs_write(xpcs, MDIO_MMD_PMAPMD, MDIO_CTRL1, 0);
204 xpcs_write(xpcs, MDIO_MMD_PCS, MDIO_CTRL1, 0);
205 txgbe_pma_config_1g(xpcs);
206 }
207
208 return txgbe_pma_init_done(xpcs);
209 }
210