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. FSM9900 EMAC SGMII Controller driver.
6 */
7
8 #include <linux/iopoll.h>
9 #include "emac.h"
10
11 /* EMAC_QSERDES register offsets */
12 #define EMAC_QSERDES_COM_SYS_CLK_CTRL 0x0000
13 #define EMAC_QSERDES_COM_PLL_CNTRL 0x0014
14 #define EMAC_QSERDES_COM_PLL_IP_SETI 0x0018
15 #define EMAC_QSERDES_COM_PLL_CP_SETI 0x0024
16 #define EMAC_QSERDES_COM_PLL_IP_SETP 0x0028
17 #define EMAC_QSERDES_COM_PLL_CP_SETP 0x002c
18 #define EMAC_QSERDES_COM_SYSCLK_EN_SEL 0x0038
19 #define EMAC_QSERDES_COM_RESETSM_CNTRL 0x0040
20 #define EMAC_QSERDES_COM_PLLLOCK_CMP1 0x0044
21 #define EMAC_QSERDES_COM_PLLLOCK_CMP2 0x0048
22 #define EMAC_QSERDES_COM_PLLLOCK_CMP3 0x004c
23 #define EMAC_QSERDES_COM_PLLLOCK_CMP_EN 0x0050
24 #define EMAC_QSERDES_COM_DEC_START1 0x0064
25 #define EMAC_QSERDES_COM_DIV_FRAC_START1 0x0098
26 #define EMAC_QSERDES_COM_DIV_FRAC_START2 0x009c
27 #define EMAC_QSERDES_COM_DIV_FRAC_START3 0x00a0
28 #define EMAC_QSERDES_COM_DEC_START2 0x00a4
29 #define EMAC_QSERDES_COM_PLL_CRCTRL 0x00ac
30 #define EMAC_QSERDES_COM_RESET_SM 0x00bc
31 #define EMAC_QSERDES_TX_BIST_MODE_LANENO 0x0100
32 #define EMAC_QSERDES_TX_TX_EMP_POST1_LVL 0x0108
33 #define EMAC_QSERDES_TX_TX_DRV_LVL 0x010c
34 #define EMAC_QSERDES_TX_LANE_MODE 0x0150
35 #define EMAC_QSERDES_TX_TRAN_DRVR_EMP_EN 0x0170
36 #define EMAC_QSERDES_RX_CDR_CONTROL 0x0200
37 #define EMAC_QSERDES_RX_CDR_CONTROL2 0x0210
38 #define EMAC_QSERDES_RX_RX_EQ_GAIN12 0x0230
39
40 /* EMAC_SGMII register offsets */
41 #define EMAC_SGMII_PHY_SERDES_START 0x0000
42 #define EMAC_SGMII_PHY_CMN_PWR_CTRL 0x0004
43 #define EMAC_SGMII_PHY_RX_PWR_CTRL 0x0008
44 #define EMAC_SGMII_PHY_TX_PWR_CTRL 0x000C
45 #define EMAC_SGMII_PHY_LANE_CTRL1 0x0018
46 #define EMAC_SGMII_PHY_CDR_CTRL0 0x0058
47 #define EMAC_SGMII_PHY_POW_DWN_CTRL0 0x0080
48 #define EMAC_SGMII_PHY_INTERRUPT_MASK 0x00b4
49
50 #define PLL_IPSETI(x) ((x) & 0x3f)
51
52 #define PLL_CPSETI(x) ((x) & 0xff)
53
54 #define PLL_IPSETP(x) ((x) & 0x3f)
55
56 #define PLL_CPSETP(x) ((x) & 0x1f)
57
58 #define PLL_RCTRL(x) (((x) & 0xf) << 4)
59 #define PLL_CCTRL(x) ((x) & 0xf)
60
61 #define LANE_MODE(x) ((x) & 0x1f)
62
63 #define SYSCLK_CM BIT(4)
64 #define SYSCLK_AC_COUPLE BIT(3)
65
66 #define OCP_EN BIT(5)
67 #define PLL_DIV_FFEN BIT(2)
68 #define PLL_DIV_ORD BIT(1)
69
70 #define SYSCLK_SEL_CMOS BIT(3)
71
72 #define FRQ_TUNE_MODE BIT(4)
73
74 #define PLLLOCK_CMP_EN BIT(0)
75
76 #define DEC_START1_MUX BIT(7)
77 #define DEC_START1(x) ((x) & 0x7f)
78
79 #define DIV_FRAC_START_MUX BIT(7)
80 #define DIV_FRAC_START(x) ((x) & 0x7f)
81
82 #define DIV_FRAC_START3_MUX BIT(4)
83 #define DIV_FRAC_START3(x) ((x) & 0xf)
84
85 #define DEC_START2_MUX BIT(1)
86 #define DEC_START2 BIT(0)
87
88 #define READY BIT(5)
89
90 #define TX_EMP_POST1_LVL_MUX BIT(5)
91 #define TX_EMP_POST1_LVL(x) ((x) & 0x1f)
92
93 #define TX_DRV_LVL_MUX BIT(4)
94 #define TX_DRV_LVL(x) ((x) & 0xf)
95
96 #define EMP_EN_MUX BIT(1)
97 #define EMP_EN BIT(0)
98
99 #define SECONDORDERENABLE BIT(6)
100 #define FIRSTORDER_THRESH(x) (((x) & 0x7) << 3)
101 #define SECONDORDERGAIN(x) ((x) & 0x7)
102
103 #define RX_EQ_GAIN2(x) (((x) & 0xf) << 4)
104 #define RX_EQ_GAIN1(x) ((x) & 0xf)
105
106 #define SERDES_START BIT(0)
107
108 #define BIAS_EN BIT(6)
109 #define PLL_EN BIT(5)
110 #define SYSCLK_EN BIT(4)
111 #define CLKBUF_L_EN BIT(3)
112 #define PLL_TXCLK_EN BIT(1)
113 #define PLL_RXCLK_EN BIT(0)
114
115 #define L0_RX_SIGDET_EN BIT(7)
116 #define L0_RX_TERM_MODE(x) (((x) & 3) << 4)
117 #define L0_RX_I_EN BIT(1)
118
119 #define L0_TX_EN BIT(5)
120 #define L0_CLKBUF_EN BIT(4)
121 #define L0_TRAN_BIAS_EN BIT(1)
122
123 #define L0_RX_EQUALIZE_ENABLE BIT(6)
124 #define L0_RESET_TSYNC_EN BIT(4)
125 #define L0_DRV_LVL(x) ((x) & 0xf)
126
127 #define PWRDN_B BIT(0)
128 #define CDR_MAX_CNT(x) ((x) & 0xff)
129
130 #define PLLLOCK_CMP(x) ((x) & 0xff)
131
132 #define SERDES_START_WAIT_TIMES 100
133
134 struct emac_reg_write {
135 unsigned int offset;
136 u32 val;
137 };
138
emac_reg_write_all(void __iomem * base,const struct emac_reg_write * itr,size_t size)139 static void emac_reg_write_all(void __iomem *base,
140 const struct emac_reg_write *itr, size_t size)
141 {
142 size_t i;
143
144 for (i = 0; i < size; ++itr, ++i)
145 writel(itr->val, base + itr->offset);
146 }
147
148 static const struct emac_reg_write physical_coding_sublayer_programming[] = {
149 {EMAC_SGMII_PHY_CDR_CTRL0, CDR_MAX_CNT(15)},
150 {EMAC_SGMII_PHY_POW_DWN_CTRL0, PWRDN_B},
151 {EMAC_SGMII_PHY_CMN_PWR_CTRL,
152 BIAS_EN | SYSCLK_EN | CLKBUF_L_EN | PLL_TXCLK_EN | PLL_RXCLK_EN},
153 {EMAC_SGMII_PHY_TX_PWR_CTRL, L0_TX_EN | L0_CLKBUF_EN | L0_TRAN_BIAS_EN},
154 {EMAC_SGMII_PHY_RX_PWR_CTRL,
155 L0_RX_SIGDET_EN | L0_RX_TERM_MODE(1) | L0_RX_I_EN},
156 {EMAC_SGMII_PHY_CMN_PWR_CTRL,
157 BIAS_EN | PLL_EN | SYSCLK_EN | CLKBUF_L_EN | PLL_TXCLK_EN |
158 PLL_RXCLK_EN},
159 {EMAC_SGMII_PHY_LANE_CTRL1,
160 L0_RX_EQUALIZE_ENABLE | L0_RESET_TSYNC_EN | L0_DRV_LVL(15)},
161 };
162
163 static const struct emac_reg_write sysclk_refclk_setting[] = {
164 {EMAC_QSERDES_COM_SYSCLK_EN_SEL, SYSCLK_SEL_CMOS},
165 {EMAC_QSERDES_COM_SYS_CLK_CTRL, SYSCLK_CM | SYSCLK_AC_COUPLE},
166 };
167
168 static const struct emac_reg_write pll_setting[] = {
169 {EMAC_QSERDES_COM_PLL_IP_SETI, PLL_IPSETI(1)},
170 {EMAC_QSERDES_COM_PLL_CP_SETI, PLL_CPSETI(59)},
171 {EMAC_QSERDES_COM_PLL_IP_SETP, PLL_IPSETP(10)},
172 {EMAC_QSERDES_COM_PLL_CP_SETP, PLL_CPSETP(9)},
173 {EMAC_QSERDES_COM_PLL_CRCTRL, PLL_RCTRL(15) | PLL_CCTRL(11)},
174 {EMAC_QSERDES_COM_PLL_CNTRL, OCP_EN | PLL_DIV_FFEN | PLL_DIV_ORD},
175 {EMAC_QSERDES_COM_DEC_START1, DEC_START1_MUX | DEC_START1(2)},
176 {EMAC_QSERDES_COM_DEC_START2, DEC_START2_MUX | DEC_START2},
177 {EMAC_QSERDES_COM_DIV_FRAC_START1,
178 DIV_FRAC_START_MUX | DIV_FRAC_START(85)},
179 {EMAC_QSERDES_COM_DIV_FRAC_START2,
180 DIV_FRAC_START_MUX | DIV_FRAC_START(42)},
181 {EMAC_QSERDES_COM_DIV_FRAC_START3,
182 DIV_FRAC_START3_MUX | DIV_FRAC_START3(3)},
183 {EMAC_QSERDES_COM_PLLLOCK_CMP1, PLLLOCK_CMP(43)},
184 {EMAC_QSERDES_COM_PLLLOCK_CMP2, PLLLOCK_CMP(104)},
185 {EMAC_QSERDES_COM_PLLLOCK_CMP3, PLLLOCK_CMP(0)},
186 {EMAC_QSERDES_COM_PLLLOCK_CMP_EN, PLLLOCK_CMP_EN},
187 {EMAC_QSERDES_COM_RESETSM_CNTRL, FRQ_TUNE_MODE},
188 };
189
190 static const struct emac_reg_write cdr_setting[] = {
191 {EMAC_QSERDES_RX_CDR_CONTROL,
192 SECONDORDERENABLE | FIRSTORDER_THRESH(3) | SECONDORDERGAIN(2)},
193 {EMAC_QSERDES_RX_CDR_CONTROL2,
194 SECONDORDERENABLE | FIRSTORDER_THRESH(3) | SECONDORDERGAIN(4)},
195 };
196
197 static const struct emac_reg_write tx_rx_setting[] = {
198 {EMAC_QSERDES_TX_BIST_MODE_LANENO, 0},
199 {EMAC_QSERDES_TX_TX_DRV_LVL, TX_DRV_LVL_MUX | TX_DRV_LVL(15)},
200 {EMAC_QSERDES_TX_TRAN_DRVR_EMP_EN, EMP_EN_MUX | EMP_EN},
201 {EMAC_QSERDES_TX_TX_EMP_POST1_LVL,
202 TX_EMP_POST1_LVL_MUX | TX_EMP_POST1_LVL(1)},
203 {EMAC_QSERDES_RX_RX_EQ_GAIN12, RX_EQ_GAIN2(15) | RX_EQ_GAIN1(15)},
204 {EMAC_QSERDES_TX_LANE_MODE, LANE_MODE(8)},
205 };
206
emac_sgmii_init_fsm9900(struct emac_adapter * adpt)207 int emac_sgmii_init_fsm9900(struct emac_adapter *adpt)
208 {
209 struct emac_sgmii *phy = &adpt->phy;
210 unsigned int i;
211
212 emac_reg_write_all(phy->base, physical_coding_sublayer_programming,
213 ARRAY_SIZE(physical_coding_sublayer_programming));
214 emac_reg_write_all(phy->base, sysclk_refclk_setting,
215 ARRAY_SIZE(sysclk_refclk_setting));
216 emac_reg_write_all(phy->base, pll_setting, ARRAY_SIZE(pll_setting));
217 emac_reg_write_all(phy->base, cdr_setting, ARRAY_SIZE(cdr_setting));
218 emac_reg_write_all(phy->base, tx_rx_setting, ARRAY_SIZE(tx_rx_setting));
219
220 /* Power up the Ser/Des engine */
221 writel(SERDES_START, phy->base + EMAC_SGMII_PHY_SERDES_START);
222
223 for (i = 0; i < SERDES_START_WAIT_TIMES; i++) {
224 if (readl(phy->base + EMAC_QSERDES_COM_RESET_SM) & READY)
225 break;
226 usleep_range(100, 200);
227 }
228
229 if (i == SERDES_START_WAIT_TIMES) {
230 netdev_err(adpt->netdev, "error: ser/des failed to start\n");
231 return -EIO;
232 }
233 /* Mask out all the SGMII Interrupt */
234 writel(0, phy->base + EMAC_SGMII_PHY_INTERRUPT_MASK);
235
236 return 0;
237 }
238
