1 // SPDX-License-Identifier: GPL-2.0
2
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2019-2022 Linaro Ltd.
5 */
6
7 #include <linux/io.h>
8
9 #include "ipa.h"
10 #include "ipa_reg.h"
11
12 /* Is this register valid and defined for the current IPA version? */
ipa_reg_valid(struct ipa * ipa,enum ipa_reg_id reg_id)13 static bool ipa_reg_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
14 {
15 enum ipa_version version = ipa->version;
16 bool valid;
17
18 /* Check for bogus (out of range) register IDs */
19 if ((u32)reg_id >= ipa->regs->reg_count)
20 return false;
21
22 switch (reg_id) {
23 case IPA_BCR:
24 case COUNTER_CFG:
25 valid = version < IPA_VERSION_4_5;
26 break;
27
28 case IPA_TX_CFG:
29 case FLAVOR_0:
30 case IDLE_INDICATION_CFG:
31 valid = version >= IPA_VERSION_3_5;
32 break;
33
34 case QTIME_TIMESTAMP_CFG:
35 case TIMERS_XO_CLK_DIV_CFG:
36 case TIMERS_PULSE_GRAN_CFG:
37 valid = version >= IPA_VERSION_4_5;
38 break;
39
40 case SRC_RSRC_GRP_45_RSRC_TYPE:
41 case DST_RSRC_GRP_45_RSRC_TYPE:
42 valid = version <= IPA_VERSION_3_1 ||
43 version == IPA_VERSION_4_5;
44 break;
45
46 case SRC_RSRC_GRP_67_RSRC_TYPE:
47 case DST_RSRC_GRP_67_RSRC_TYPE:
48 valid = version <= IPA_VERSION_3_1;
49 break;
50
51 case ENDP_FILTER_ROUTER_HSH_CFG:
52 valid = version != IPA_VERSION_4_2;
53 break;
54
55 case IRQ_SUSPEND_EN:
56 case IRQ_SUSPEND_CLR:
57 valid = version >= IPA_VERSION_3_1;
58 break;
59
60 default:
61 valid = true; /* Others should be defined for all versions */
62 break;
63 }
64
65 /* To be valid, it must be defined */
66
67 return valid && ipa->regs->reg[reg_id];
68 }
69
ipa_reg(struct ipa * ipa,enum ipa_reg_id reg_id)70 const struct ipa_reg *ipa_reg(struct ipa *ipa, enum ipa_reg_id reg_id)
71 {
72 if (WARN_ON(!ipa_reg_valid(ipa, reg_id)))
73 return NULL;
74
75 return ipa->regs->reg[reg_id];
76 }
77
ipa_regs(enum ipa_version version)78 static const struct ipa_regs *ipa_regs(enum ipa_version version)
79 {
80 switch (version) {
81 case IPA_VERSION_3_1:
82 return &ipa_regs_v3_1;
83 case IPA_VERSION_3_5_1:
84 return &ipa_regs_v3_5_1;
85 case IPA_VERSION_4_2:
86 return &ipa_regs_v4_2;
87 case IPA_VERSION_4_5:
88 return &ipa_regs_v4_5;
89 case IPA_VERSION_4_9:
90 return &ipa_regs_v4_9;
91 case IPA_VERSION_4_11:
92 return &ipa_regs_v4_11;
93 default:
94 return NULL;
95 }
96 }
97
ipa_reg_init(struct ipa * ipa)98 int ipa_reg_init(struct ipa *ipa)
99 {
100 struct device *dev = &ipa->pdev->dev;
101 const struct ipa_regs *regs;
102 struct resource *res;
103
104 regs = ipa_regs(ipa->version);
105 if (!regs)
106 return -EINVAL;
107
108 if (WARN_ON(regs->reg_count > IPA_REG_ID_COUNT))
109 return -EINVAL;
110
111 /* Setup IPA register memory */
112 res = platform_get_resource_byname(ipa->pdev, IORESOURCE_MEM,
113 "ipa-reg");
114 if (!res) {
115 dev_err(dev, "DT error getting \"ipa-reg\" memory property\n");
116 return -ENODEV;
117 }
118
119 ipa->reg_virt = ioremap(res->start, resource_size(res));
120 if (!ipa->reg_virt) {
121 dev_err(dev, "unable to remap \"ipa-reg\" memory\n");
122 return -ENOMEM;
123 }
124 ipa->reg_addr = res->start;
125 ipa->regs = regs;
126
127 return 0;
128 }
129
ipa_reg_exit(struct ipa * ipa)130 void ipa_reg_exit(struct ipa *ipa)
131 {
132 iounmap(ipa->reg_virt);
133 }
134