1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2 /*
3 * Copyright (c) 2019 Amlogic, Inc.
4 * Author: Jianxin Pan <jianxin.pan@amlogic.com>
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/io.h>
10 #include <linux/of.h>
11 #include <linux/platform_device.h>
12 #include <linux/pm_domain.h>
13 #include <dt-bindings/power/meson-a1-power.h>
14 #include <dt-bindings/power/amlogic,c3-pwrc.h>
15 #include <dt-bindings/power/meson-s4-power.h>
16 #include <linux/arm-smccc.h>
17 #include <linux/firmware/meson/meson_sm.h>
18 #include <linux/module.h>
19
20 #define PWRC_ON 1
21 #define PWRC_OFF 0
22
23 struct meson_secure_pwrc_domain {
24 struct generic_pm_domain base;
25 unsigned int index;
26 struct meson_secure_pwrc *pwrc;
27 };
28
29 struct meson_secure_pwrc {
30 struct meson_secure_pwrc_domain *domains;
31 struct genpd_onecell_data xlate;
32 struct meson_sm_firmware *fw;
33 };
34
35 struct meson_secure_pwrc_domain_desc {
36 unsigned int index;
37 unsigned int flags;
38 char *name;
39 bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
40 };
41
42 struct meson_secure_pwrc_domain_data {
43 unsigned int count;
44 struct meson_secure_pwrc_domain_desc *domains;
45 };
46
pwrc_secure_is_off(struct meson_secure_pwrc_domain * pwrc_domain)47 static bool pwrc_secure_is_off(struct meson_secure_pwrc_domain *pwrc_domain)
48 {
49 int is_off = 1;
50
51 if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_GET, &is_off,
52 pwrc_domain->index, 0, 0, 0, 0) < 0)
53 pr_err("failed to get power domain status\n");
54
55 return is_off;
56 }
57
meson_secure_pwrc_off(struct generic_pm_domain * domain)58 static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
59 {
60 int ret = 0;
61 struct meson_secure_pwrc_domain *pwrc_domain =
62 container_of(domain, struct meson_secure_pwrc_domain, base);
63
64 if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
65 pwrc_domain->index, PWRC_OFF, 0, 0, 0) < 0) {
66 pr_err("failed to set power domain off\n");
67 ret = -EINVAL;
68 }
69
70 return ret;
71 }
72
meson_secure_pwrc_on(struct generic_pm_domain * domain)73 static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
74 {
75 int ret = 0;
76 struct meson_secure_pwrc_domain *pwrc_domain =
77 container_of(domain, struct meson_secure_pwrc_domain, base);
78
79 if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
80 pwrc_domain->index, PWRC_ON, 0, 0, 0) < 0) {
81 pr_err("failed to set power domain on\n");
82 ret = -EINVAL;
83 }
84
85 return ret;
86 }
87
88 #define SEC_PD(__name, __flag) \
89 [PWRC_##__name##_ID] = \
90 { \
91 .name = #__name, \
92 .index = PWRC_##__name##_ID, \
93 .is_off = pwrc_secure_is_off, \
94 .flags = __flag, \
95 }
96
97 static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
98 SEC_PD(DSPA, 0),
99 SEC_PD(DSPB, 0),
100 /* UART should keep working in ATF after suspend and before resume */
101 SEC_PD(UART, GENPD_FLAG_ALWAYS_ON),
102 /* DMC is for DDR PHY ana/dig and DMC, and should be always on */
103 SEC_PD(DMC, GENPD_FLAG_ALWAYS_ON),
104 SEC_PD(I2C, 0),
105 SEC_PD(PSRAM, 0),
106 SEC_PD(ACODEC, 0),
107 SEC_PD(AUDIO, 0),
108 SEC_PD(OTP, 0),
109 SEC_PD(DMA, GENPD_FLAG_ALWAYS_ON | GENPD_FLAG_IRQ_SAFE),
110 SEC_PD(SD_EMMC, 0),
111 SEC_PD(RAMA, 0),
112 /* SRAMB is used as ATF runtime memory, and should be always on */
113 SEC_PD(RAMB, GENPD_FLAG_ALWAYS_ON),
114 SEC_PD(IR, 0),
115 SEC_PD(SPICC, 0),
116 SEC_PD(SPIFC, 0),
117 SEC_PD(USB, 0),
118 /* NIC is for the Arm NIC-400 interconnect, and should be always on */
119 SEC_PD(NIC, GENPD_FLAG_ALWAYS_ON),
120 SEC_PD(PDMIN, 0),
121 SEC_PD(RSA, 0),
122 };
123
124 static struct meson_secure_pwrc_domain_desc c3_pwrc_domains[] = {
125 SEC_PD(C3_NNA, 0),
126 SEC_PD(C3_AUDIO, GENPD_FLAG_ALWAYS_ON),
127 SEC_PD(C3_SDIOA, GENPD_FLAG_ALWAYS_ON),
128 SEC_PD(C3_EMMC, GENPD_FLAG_ALWAYS_ON),
129 SEC_PD(C3_USB_COMB, GENPD_FLAG_ALWAYS_ON),
130 SEC_PD(C3_SDCARD, GENPD_FLAG_ALWAYS_ON),
131 SEC_PD(C3_ETH, GENPD_FLAG_ALWAYS_ON),
132 SEC_PD(C3_GE2D, GENPD_FLAG_ALWAYS_ON),
133 SEC_PD(C3_CVE, GENPD_FLAG_ALWAYS_ON),
134 SEC_PD(C3_GDC_WRAP, GENPD_FLAG_ALWAYS_ON),
135 SEC_PD(C3_ISP_TOP, GENPD_FLAG_ALWAYS_ON),
136 SEC_PD(C3_MIPI_ISP_WRAP, GENPD_FLAG_ALWAYS_ON),
137 SEC_PD(C3_VCODEC, 0),
138 };
139
140 static struct meson_secure_pwrc_domain_desc s4_pwrc_domains[] = {
141 SEC_PD(S4_DOS_HEVC, 0),
142 SEC_PD(S4_DOS_VDEC, 0),
143 SEC_PD(S4_VPU_HDMI, 0),
144 SEC_PD(S4_USB_COMB, 0),
145 SEC_PD(S4_GE2D, 0),
146 /* ETH is for ethernet online wakeup, and should be always on */
147 SEC_PD(S4_ETH, GENPD_FLAG_ALWAYS_ON),
148 SEC_PD(S4_DEMOD, 0),
149 SEC_PD(S4_AUDIO, 0),
150 };
151
meson_secure_pwrc_probe(struct platform_device * pdev)152 static int meson_secure_pwrc_probe(struct platform_device *pdev)
153 {
154 int i;
155 struct device_node *sm_np;
156 struct meson_secure_pwrc *pwrc;
157 const struct meson_secure_pwrc_domain_data *match;
158
159 match = of_device_get_match_data(&pdev->dev);
160 if (!match) {
161 dev_err(&pdev->dev, "failed to get match data\n");
162 return -ENODEV;
163 }
164
165 sm_np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm");
166 if (!sm_np) {
167 dev_err(&pdev->dev, "no secure-monitor node\n");
168 return -ENODEV;
169 }
170
171 pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
172 if (!pwrc) {
173 of_node_put(sm_np);
174 return -ENOMEM;
175 }
176
177 pwrc->fw = meson_sm_get(sm_np);
178 of_node_put(sm_np);
179 if (!pwrc->fw)
180 return -EPROBE_DEFER;
181
182 pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
183 sizeof(*pwrc->xlate.domains),
184 GFP_KERNEL);
185 if (!pwrc->xlate.domains)
186 return -ENOMEM;
187
188 pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
189 sizeof(*pwrc->domains), GFP_KERNEL);
190 if (!pwrc->domains)
191 return -ENOMEM;
192
193 pwrc->xlate.num_domains = match->count;
194 platform_set_drvdata(pdev, pwrc);
195
196 for (i = 0 ; i < match->count ; ++i) {
197 struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
198
199 if (!match->domains[i].name)
200 continue;
201
202 dom->pwrc = pwrc;
203 dom->index = match->domains[i].index;
204 dom->base.name = match->domains[i].name;
205 dom->base.flags = match->domains[i].flags;
206 dom->base.power_on = meson_secure_pwrc_on;
207 dom->base.power_off = meson_secure_pwrc_off;
208
209 pm_genpd_init(&dom->base, NULL, match->domains[i].is_off(dom));
210
211 pwrc->xlate.domains[i] = &dom->base;
212 }
213
214 return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
215 }
216
217 static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
218 .domains = a1_pwrc_domains,
219 .count = ARRAY_SIZE(a1_pwrc_domains),
220 };
221
222 static struct meson_secure_pwrc_domain_data amlogic_secure_c3_pwrc_data = {
223 .domains = c3_pwrc_domains,
224 .count = ARRAY_SIZE(c3_pwrc_domains),
225 };
226
227 static struct meson_secure_pwrc_domain_data meson_secure_s4_pwrc_data = {
228 .domains = s4_pwrc_domains,
229 .count = ARRAY_SIZE(s4_pwrc_domains),
230 };
231
232 static const struct of_device_id meson_secure_pwrc_match_table[] = {
233 {
234 .compatible = "amlogic,meson-a1-pwrc",
235 .data = &meson_secure_a1_pwrc_data,
236 },
237 {
238 .compatible = "amlogic,c3-pwrc",
239 .data = &amlogic_secure_c3_pwrc_data,
240 },
241 {
242 .compatible = "amlogic,meson-s4-pwrc",
243 .data = &meson_secure_s4_pwrc_data,
244 },
245 { /* sentinel */ }
246 };
247 MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);
248
249 static struct platform_driver meson_secure_pwrc_driver = {
250 .probe = meson_secure_pwrc_probe,
251 .driver = {
252 .name = "meson_secure_pwrc",
253 .of_match_table = meson_secure_pwrc_match_table,
254 },
255 };
256 module_platform_driver(meson_secure_pwrc_driver);
257 MODULE_LICENSE("Dual MIT/GPL");
258