1 // SPDX-License-Identifier: GPL-2.0
2
3 /* Copyright (C) 2023 Linaro Ltd. */
4
5 #include <linux/platform_device.h>
6 #include <linux/io.h>
7
8 #include "gsi.h"
9 #include "reg.h"
10 #include "gsi_reg.h"
11
12 /* Is this register ID valid for the current GSI version? */
gsi_reg_id_valid(struct gsi * gsi,enum gsi_reg_id reg_id)13 static bool gsi_reg_id_valid(struct gsi *gsi, enum gsi_reg_id reg_id)
14 {
15 switch (reg_id) {
16 case INTER_EE_SRC_CH_IRQ_MSK:
17 case INTER_EE_SRC_EV_CH_IRQ_MSK:
18 case CH_C_CNTXT_0:
19 case CH_C_CNTXT_1:
20 case CH_C_CNTXT_2:
21 case CH_C_CNTXT_3:
22 case CH_C_QOS:
23 case CH_C_SCRATCH_0:
24 case CH_C_SCRATCH_1:
25 case CH_C_SCRATCH_2:
26 case CH_C_SCRATCH_3:
27 case EV_CH_E_CNTXT_0:
28 case EV_CH_E_CNTXT_1:
29 case EV_CH_E_CNTXT_2:
30 case EV_CH_E_CNTXT_3:
31 case EV_CH_E_CNTXT_4:
32 case EV_CH_E_CNTXT_8:
33 case EV_CH_E_CNTXT_9:
34 case EV_CH_E_CNTXT_10:
35 case EV_CH_E_CNTXT_11:
36 case EV_CH_E_CNTXT_12:
37 case EV_CH_E_CNTXT_13:
38 case EV_CH_E_SCRATCH_0:
39 case EV_CH_E_SCRATCH_1:
40 case CH_C_DOORBELL_0:
41 case EV_CH_E_DOORBELL_0:
42 case GSI_STATUS:
43 case CH_CMD:
44 case EV_CH_CMD:
45 case GENERIC_CMD:
46 case HW_PARAM_2:
47 case CNTXT_TYPE_IRQ:
48 case CNTXT_TYPE_IRQ_MSK:
49 case CNTXT_SRC_CH_IRQ:
50 case CNTXT_SRC_CH_IRQ_MSK:
51 case CNTXT_SRC_CH_IRQ_CLR:
52 case CNTXT_SRC_EV_CH_IRQ:
53 case CNTXT_SRC_EV_CH_IRQ_MSK:
54 case CNTXT_SRC_EV_CH_IRQ_CLR:
55 case CNTXT_SRC_IEOB_IRQ:
56 case CNTXT_SRC_IEOB_IRQ_MSK:
57 case CNTXT_SRC_IEOB_IRQ_CLR:
58 case CNTXT_GLOB_IRQ_STTS:
59 case CNTXT_GLOB_IRQ_EN:
60 case CNTXT_GLOB_IRQ_CLR:
61 case CNTXT_GSI_IRQ_STTS:
62 case CNTXT_GSI_IRQ_EN:
63 case CNTXT_GSI_IRQ_CLR:
64 case CNTXT_INTSET:
65 case ERROR_LOG:
66 case ERROR_LOG_CLR:
67 case CNTXT_SCRATCH_0:
68 return true;
69
70 default:
71 return false;
72 }
73 }
74
gsi_reg(struct gsi * gsi,enum gsi_reg_id reg_id)75 const struct reg *gsi_reg(struct gsi *gsi, enum gsi_reg_id reg_id)
76 {
77 if (WARN(!gsi_reg_id_valid(gsi, reg_id), "invalid reg %u\n", reg_id))
78 return NULL;
79
80 return reg(gsi->regs, reg_id);
81 }
82
gsi_regs(struct gsi * gsi)83 static const struct regs *gsi_regs(struct gsi *gsi)
84 {
85 switch (gsi->version) {
86 case IPA_VERSION_3_1:
87 return &gsi_regs_v3_1;
88
89 case IPA_VERSION_3_5_1:
90 return &gsi_regs_v3_5_1;
91
92 case IPA_VERSION_4_2:
93 return &gsi_regs_v4_0;
94
95 case IPA_VERSION_4_5:
96 case IPA_VERSION_4_7:
97 return &gsi_regs_v4_5;
98
99 case IPA_VERSION_4_9:
100 return &gsi_regs_v4_9;
101
102 case IPA_VERSION_4_11:
103 return &gsi_regs_v4_11;
104
105 default:
106 return NULL;
107 }
108 }
109
110 /* Sets gsi->virt and I/O maps the "gsi" memory range for registers */
gsi_reg_init(struct gsi * gsi,struct platform_device * pdev)111 int gsi_reg_init(struct gsi *gsi, struct platform_device *pdev)
112 {
113 struct device *dev = &pdev->dev;
114 struct resource *res;
115 resource_size_t size;
116
117 /* Get GSI memory range and map it */
118 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsi");
119 if (!res) {
120 dev_err(dev, "DT error getting \"gsi\" memory property\n");
121 return -ENODEV;
122 }
123
124 size = resource_size(res);
125 if (res->start > U32_MAX || size > U32_MAX - res->start) {
126 dev_err(dev, "DT memory resource \"gsi\" out of range\n");
127 return -EINVAL;
128 }
129
130 gsi->regs = gsi_regs(gsi);
131 if (!gsi->regs) {
132 dev_err(dev, "unsupported IPA version %u (?)\n", gsi->version);
133 return -EINVAL;
134 }
135
136 gsi->virt = ioremap(res->start, size);
137 if (!gsi->virt) {
138 dev_err(dev, "unable to remap \"gsi\" memory\n");
139 return -ENOMEM;
140 }
141
142 return 0;
143 }
144
145 /* Inverse of gsi_reg_init() */
gsi_reg_exit(struct gsi * gsi)146 void gsi_reg_exit(struct gsi *gsi)
147 {
148 iounmap(gsi->virt);
149 gsi->virt = NULL;
150 gsi->regs = NULL;
151 }
152