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ef2eb106 AR |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright (c) 2023 SberDevices, Inc. | |
4 | * | |
5 | * Author: Alexey Romanov <avromanov@salutedevices.com> | |
6 | */ | |
7 | ||
d678a59d | 8 | #include <common.h> |
ef2eb106 AR |
9 | #include <dm.h> |
10 | #include <regmap.h> | |
11 | #include <sm.h> | |
12 | #include <sm-uclass.h> | |
13 | #include <stdlib.h> | |
14 | #include <syscon.h> | |
15 | #include <asm/ptrace.h> | |
16 | #include <asm/system.h> | |
17 | #include <meson/sm.h> | |
18 | #include <linux/bitfield.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/sizes.h> | |
21 | ||
22 | struct meson_sm_cmd { | |
23 | u32 smc_id; | |
24 | }; | |
25 | ||
26 | #define SET_CMD(index, id) \ | |
27 | [index] = { \ | |
28 | .smc_id = (id), \ | |
29 | } | |
30 | ||
31 | struct meson_sm_data { | |
32 | u32 cmd_get_shmem_in; | |
33 | u32 cmd_get_shmem_out; | |
34 | unsigned int shmem_size; | |
35 | struct meson_sm_cmd cmd[]; | |
36 | }; | |
37 | ||
38 | struct meson_sm_priv { | |
39 | void *sm_shmem_in; | |
40 | void *sm_shmem_out; | |
41 | const struct meson_sm_data *data; | |
42 | }; | |
43 | ||
44 | static unsigned long __meson_sm_call(u32 cmd, const struct pt_regs *args) | |
45 | { | |
46 | struct pt_regs r = *args; | |
47 | ||
48 | r.regs[0] = cmd; | |
49 | smc_call(&r); | |
50 | ||
51 | return r.regs[0]; | |
52 | }; | |
53 | ||
54 | static u32 meson_sm_get_cmd(const struct meson_sm_data *data, | |
55 | u32 cmd_index) | |
56 | { | |
57 | struct meson_sm_cmd cmd; | |
58 | ||
59 | if (cmd_index >= MESON_SMC_CMD_COUNT) | |
60 | return 0; | |
61 | ||
62 | cmd = data->cmd[cmd_index]; | |
63 | return cmd.smc_id; | |
64 | } | |
65 | ||
66 | static int meson_sm_call(struct udevice *dev, u32 cmd_index, s32 *retval, | |
67 | struct pt_regs *args) | |
68 | { | |
69 | struct meson_sm_priv *priv = dev_get_priv(dev); | |
70 | u32 cmd, ret; | |
71 | ||
72 | cmd = meson_sm_get_cmd(priv->data, cmd_index); | |
73 | if (!cmd) | |
74 | return -ENOENT; | |
75 | ||
76 | ret = __meson_sm_call(cmd, args); | |
77 | if (retval) | |
78 | *retval = ret; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int meson_sm_call_read(struct udevice *dev, void *buffer, size_t size, | |
84 | u32 cmd_index, struct pt_regs *args) | |
85 | { | |
86 | struct meson_sm_priv *priv = dev_get_priv(dev); | |
87 | s32 nbytes; | |
88 | int ret; | |
89 | ||
90 | if (!buffer || size > priv->data->shmem_size) | |
91 | return -EINVAL; | |
92 | ||
93 | ret = meson_sm_call(dev, cmd_index, &nbytes, args); | |
94 | if (ret) | |
95 | return ret; | |
96 | ||
97 | if (nbytes < 0 || nbytes > size) | |
98 | return -ENOBUFS; | |
99 | ||
100 | /* In some cases (for example GET_CHIP_ID command), | |
101 | * SMC doesn't return the number of bytes read, even | |
102 | * though the bytes were actually read into sm_shmem_out. | |
103 | * So this check is needed. | |
104 | */ | |
105 | ret = nbytes; | |
106 | if (!nbytes) | |
107 | nbytes = size; | |
108 | ||
109 | memcpy(buffer, priv->sm_shmem_out, nbytes); | |
110 | ||
111 | return ret; | |
112 | } | |
113 | ||
114 | static int meson_sm_call_write(struct udevice *dev, void *buffer, size_t size, | |
115 | u32 cmd_index, struct pt_regs *args) | |
116 | { | |
117 | struct meson_sm_priv *priv = dev_get_priv(dev); | |
118 | s32 nbytes; | |
119 | int ret; | |
120 | ||
121 | if (!buffer || size > priv->data->shmem_size) | |
122 | return -EINVAL; | |
123 | ||
124 | memcpy(priv->sm_shmem_in, buffer, size); | |
125 | ||
126 | ret = meson_sm_call(dev, cmd_index, &nbytes, args); | |
127 | if (ret) | |
128 | return ret; | |
129 | ||
130 | if (nbytes <= 0 || nbytes > size) | |
131 | return -EIO; | |
132 | ||
133 | return nbytes; | |
134 | } | |
135 | ||
136 | static int meson_sm_probe(struct udevice *dev) | |
137 | { | |
138 | struct meson_sm_priv *priv = dev_get_priv(dev); | |
139 | struct pt_regs regs = { 0 }; | |
140 | ||
141 | priv->data = (struct meson_sm_data *)dev_get_driver_data(dev); | |
142 | if (!priv->data) | |
143 | return -EINVAL; | |
144 | ||
145 | priv->sm_shmem_in = | |
146 | (void *)__meson_sm_call(priv->data->cmd_get_shmem_in, ®s); | |
147 | ||
148 | if (!priv->sm_shmem_in) | |
149 | return -ENOMEM; | |
150 | ||
151 | priv->sm_shmem_out = | |
152 | (void *)__meson_sm_call(priv->data->cmd_get_shmem_out, ®s); | |
153 | ||
154 | if (!priv->sm_shmem_out) | |
155 | return -ENOMEM; | |
156 | ||
157 | pr_debug("meson sm driver probed\n" | |
158 | "shmem_in addr: 0x%p, shmem_out addr: 0x%p\n", | |
159 | priv->sm_shmem_in, | |
160 | priv->sm_shmem_out); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static const struct meson_sm_data meson_sm_gxbb_data = { | |
166 | .cmd_get_shmem_in = 0x82000020, | |
167 | .cmd_get_shmem_out = 0x82000021, | |
168 | .shmem_size = SZ_4K, | |
169 | .cmd = { | |
170 | SET_CMD(MESON_SMC_CMD_EFUSE_READ, 0x82000030), | |
171 | SET_CMD(MESON_SMC_CMD_EFUSE_WRITE, 0x82000031), | |
172 | SET_CMD(MESON_SMC_CMD_CHIP_ID_GET, 0x82000044), | |
173 | SET_CMD(MESON_SMC_CMD_PWRDM_SET, 0x82000093), | |
174 | }, | |
175 | }; | |
176 | ||
177 | static const struct udevice_id meson_sm_ids[] = { | |
178 | { | |
179 | .compatible = "amlogic,meson-gxbb-sm", | |
180 | .data = (ulong)&meson_sm_gxbb_data, | |
181 | }, | |
182 | { } | |
183 | }; | |
184 | ||
185 | static const struct sm_ops sm_ops = { | |
186 | .sm_call = meson_sm_call, | |
187 | .sm_call_read = meson_sm_call_read, | |
188 | .sm_call_write = meson_sm_call_write, | |
189 | }; | |
190 | ||
191 | U_BOOT_DRIVER(meson_sm) = { | |
192 | .name = "meson_sm", | |
193 | .id = UCLASS_SM, | |
194 | .of_match = meson_sm_ids, | |
195 | .probe = meson_sm_probe, | |
e9f4f778 | 196 | .bind = dm_scan_fdt_dev, |
ef2eb106 AR |
197 | .priv_auto = sizeof(struct meson_sm_priv), |
198 | .ops = &sm_ops, | |
199 | }; |