xref: /openbmc/linux/drivers/net/ipa/gsi_reg.c (revision 5e0266f0) 
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 	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 
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 
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 */
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() */
146 void gsi_reg_exit(struct gsi *gsi)
147 {
148 	iounmap(gsi->virt);
149 	gsi->virt = NULL;
150 	gsi->regs = NULL;
151 }
152