xref: /openbmc/linux/drivers/net/ipa/gsi_reg.c (revision d95debbd) 
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? */
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 		return gsi->version >= IPA_VERSION_3_5;
19 
20 	case HW_PARAM_2:
21 		return gsi->version >= IPA_VERSION_3_5_1;
22 
23 	case HW_PARAM_4:
24 		return gsi->version >= IPA_VERSION_5_0;
25 
26 	case CH_C_CNTXT_0:
27 	case CH_C_CNTXT_1:
28 	case CH_C_CNTXT_2:
29 	case CH_C_CNTXT_3:
30 	case CH_C_QOS:
31 	case CH_C_SCRATCH_0:
32 	case CH_C_SCRATCH_1:
33 	case CH_C_SCRATCH_2:
34 	case CH_C_SCRATCH_3:
35 	case EV_CH_E_CNTXT_0:
36 	case EV_CH_E_CNTXT_1:
37 	case EV_CH_E_CNTXT_2:
38 	case EV_CH_E_CNTXT_3:
39 	case EV_CH_E_CNTXT_4:
40 	case EV_CH_E_CNTXT_8:
41 	case EV_CH_E_CNTXT_9:
42 	case EV_CH_E_CNTXT_10:
43 	case EV_CH_E_CNTXT_11:
44 	case EV_CH_E_CNTXT_12:
45 	case EV_CH_E_CNTXT_13:
46 	case EV_CH_E_SCRATCH_0:
47 	case EV_CH_E_SCRATCH_1:
48 	case CH_C_DOORBELL_0:
49 	case EV_CH_E_DOORBELL_0:
50 	case GSI_STATUS:
51 	case CH_CMD:
52 	case EV_CH_CMD:
53 	case GENERIC_CMD:
54 	case CNTXT_TYPE_IRQ:
55 	case CNTXT_TYPE_IRQ_MSK:
56 	case CNTXT_SRC_CH_IRQ:
57 	case CNTXT_SRC_CH_IRQ_MSK:
58 	case CNTXT_SRC_CH_IRQ_CLR:
59 	case CNTXT_SRC_EV_CH_IRQ:
60 	case CNTXT_SRC_EV_CH_IRQ_MSK:
61 	case CNTXT_SRC_EV_CH_IRQ_CLR:
62 	case CNTXT_SRC_IEOB_IRQ:
63 	case CNTXT_SRC_IEOB_IRQ_MSK:
64 	case CNTXT_SRC_IEOB_IRQ_CLR:
65 	case CNTXT_GLOB_IRQ_STTS:
66 	case CNTXT_GLOB_IRQ_EN:
67 	case CNTXT_GLOB_IRQ_CLR:
68 	case CNTXT_GSI_IRQ_STTS:
69 	case CNTXT_GSI_IRQ_EN:
70 	case CNTXT_GSI_IRQ_CLR:
71 	case CNTXT_INTSET:
72 	case ERROR_LOG:
73 	case ERROR_LOG_CLR:
74 	case CNTXT_SCRATCH_0:
75 		return true;
76 
77 	default:
78 		return false;
79 	}
80 }
81 
82 const struct reg *gsi_reg(struct gsi *gsi, enum gsi_reg_id reg_id)
83 {
84 	if (WARN(!gsi_reg_id_valid(gsi, reg_id), "invalid reg %u\n", reg_id))
85 		return NULL;
86 
87 	return reg(gsi->regs, reg_id);
88 }
89 
90 static const struct regs *gsi_regs(struct gsi *gsi)
91 {
92 	switch (gsi->version) {
93 	case IPA_VERSION_3_1:
94 		return &gsi_regs_v3_1;
95 
96 	case IPA_VERSION_3_5_1:
97 		return &gsi_regs_v3_5_1;
98 
99 	case IPA_VERSION_4_2:
100 		return &gsi_regs_v4_0;
101 
102 	case IPA_VERSION_4_5:
103 	case IPA_VERSION_4_7:
104 		return &gsi_regs_v4_5;
105 
106 	case IPA_VERSION_4_9:
107 		return &gsi_regs_v4_9;
108 
109 	case IPA_VERSION_4_11:
110 		return &gsi_regs_v4_11;
111 
112 	default:
113 		return NULL;
114 	}
115 }
116 
117 /* Sets gsi->virt and I/O maps the "gsi" memory range for registers */
118 int gsi_reg_init(struct gsi *gsi, struct platform_device *pdev)
119 {
120 	struct device *dev = &pdev->dev;
121 	struct resource *res;
122 	resource_size_t size;
123 
124 	/* Get GSI memory range and map it */
125 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsi");
126 	if (!res) {
127 		dev_err(dev, "DT error getting \"gsi\" memory property\n");
128 		return -ENODEV;
129 	}
130 
131 	size = resource_size(res);
132 	if (res->start > U32_MAX || size > U32_MAX - res->start) {
133 		dev_err(dev, "DT memory resource \"gsi\" out of range\n");
134 		return -EINVAL;
135 	}
136 
137 	gsi->regs = gsi_regs(gsi);
138 	if (!gsi->regs) {
139 		dev_err(dev, "unsupported IPA version %u (?)\n", gsi->version);
140 		return -EINVAL;
141 	}
142 
143 	gsi->virt = ioremap(res->start, size);
144 	if (!gsi->virt) {
145 		dev_err(dev, "unable to remap \"gsi\" memory\n");
146 		return -ENOMEM;
147 	}
148 
149 	return 0;
150 }
151 
152 /* Inverse of gsi_reg_init() */
153 void gsi_reg_exit(struct gsi *gsi)
154 {
155 	iounmap(gsi->virt);
156 	gsi->virt = NULL;
157 	gsi->regs = NULL;
158 }
159