1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2015-2016 Marvell International Ltd.
4  */
5 
6 #include <common.h>
7 #include <asm/io.h>
8 
9 #include "comphy_core.h"
10 #include "comphy_hpipe.h"
11 
12 /*
13  * comphy_mux_check_config()
14  * description: this function passes over the COMPHY lanes and check if the type
15  *              is valid for specific lane. If the type is not valid,
16  *              the function update the struct and set the type of the lane as
17  *              PHY_TYPE_UNCONNECTED
18  */
19 static void comphy_mux_check_config(struct comphy_mux_data *mux_data,
20 		struct comphy_map *comphy_map_data, int comphy_max_lanes)
21 {
22 	struct comphy_mux_options *mux_opt;
23 	int lane, opt, valid;
24 
25 	debug_enter();
26 
27 	for (lane = 0; lane < comphy_max_lanes;
28 	     lane++, comphy_map_data++, mux_data++) {
29 		/* Don't check ignored COMPHYs */
30 		if (comphy_map_data->type == PHY_TYPE_IGNORE)
31 			continue;
32 
33 		mux_opt = mux_data->mux_values;
34 		for (opt = 0, valid = 0; opt < mux_data->max_lane_values;
35 		     opt++, mux_opt++) {
36 			if (mux_opt->type == comphy_map_data->type) {
37 				valid = 1;
38 				break;
39 			}
40 		}
41 		if (valid == 0) {
42 			debug("lane number %d, had invalid type %d\n",
43 			      lane, comphy_map_data->type);
44 			debug("set lane %d as type %d\n", lane,
45 			      PHY_TYPE_UNCONNECTED);
46 			comphy_map_data->type = PHY_TYPE_UNCONNECTED;
47 		} else {
48 			debug("lane number %d, has type %d\n",
49 			      lane, comphy_map_data->type);
50 		}
51 	}
52 
53 	debug_exit();
54 }
55 
56 static u32 comphy_mux_get_mux_value(struct comphy_mux_data *mux_data,
57 				    u32 type, int lane)
58 {
59 	struct comphy_mux_options *mux_opt;
60 	int opt;
61 	u32 value = 0;
62 
63 	debug_enter();
64 
65 	mux_opt = mux_data->mux_values;
66 	for (opt = 0 ; opt < mux_data->max_lane_values; opt++, mux_opt++) {
67 		if (mux_opt->type == type) {
68 			value = mux_opt->mux_value;
69 			break;
70 		}
71 	}
72 
73 	debug_exit();
74 
75 	return value;
76 }
77 
78 static void comphy_mux_reg_write(struct comphy_mux_data *mux_data,
79 				 struct comphy_map *comphy_map_data,
80 				 int comphy_max_lanes,
81 				 void __iomem *selector_base,
82 				 const fdt32_t *mux_lane_order, u32 bitcount)
83 {
84 	u32 lane, value, offset, mask;
85 
86 	debug_enter();
87 
88 	for (lane = 0; lane < comphy_max_lanes;
89 	     lane++, comphy_map_data++, mux_data++) {
90 		if (comphy_map_data->type == PHY_TYPE_IGNORE)
91 			continue;
92 
93 		/*
94 		 * if the order of nodes in selector base register is
95 		 * nontrivial, use mapping from mux_lane_order
96 		 */
97 		if (mux_lane_order)
98 			offset = fdt32_to_cpu(mux_lane_order[lane]) * bitcount;
99 		else
100 			offset = lane * bitcount;
101 
102 		mask = (((1 << bitcount) - 1) << offset);
103 		value = (comphy_mux_get_mux_value(mux_data,
104 						  comphy_map_data->type,
105 						  lane) << offset);
106 		reg_set(selector_base, value, mask);
107 	}
108 
109 	debug_exit();
110 }
111 
112 void comphy_mux_init(struct chip_serdes_phy_config *chip_cfg,
113 		     struct comphy_map *comphy_map_data,
114 		     void __iomem *selector_base)
115 {
116 	struct comphy_mux_data *mux_data;
117 	const fdt32_t *mux_lane_order;
118 	u32 mux_bitcount;
119 	u32 comphy_max_lanes;
120 
121 	debug_enter();
122 
123 	comphy_max_lanes = chip_cfg->comphy_lanes_count;
124 	mux_data = chip_cfg->mux_data;
125 	mux_lane_order = chip_cfg->comphy_mux_lane_order;
126 	mux_bitcount = chip_cfg->comphy_mux_bitcount;
127 
128 	/* check if the configuration is valid */
129 	comphy_mux_check_config(mux_data, comphy_map_data, comphy_max_lanes);
130 	/* Init COMPHY selectors */
131 	comphy_mux_reg_write(mux_data, comphy_map_data, comphy_max_lanes,
132 			     selector_base, mux_lane_order, mux_bitcount);
133 
134 	debug_exit();
135 }
136