1 /*
2 * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <string.h>
9
10 #include <arch_helpers.h>
11 #include <common/debug.h>
12 #include <drivers/arm/css/css_mhu_doorbell.h>
13 #include <drivers/arm/css/css_scp.h>
14 #include <drivers/arm/css/scmi.h>
15 #include <plat/arm/css/common/css_pm.h>
16 #include <plat/common/platform.h>
17 #include <platform_def.h>
18
19 #include <scmi_sq.h>
20 #include <sq_common.h>
21
22 /*
23 * This file implements the SCP helper functions using SCMI protocol.
24 */
25
26 DEFINE_BAKERY_LOCK(sq_scmi_lock);
27 #define SQ_SCMI_LOCK_GET_INSTANCE (&sq_scmi_lock)
28
29 #define SQ_SCMI_PAYLOAD_BASE PLAT_SQ_SCP_COM_SHARED_MEM_BASE
30 #define MHU_CPU_INTR_S_SET_OFFSET 0x308
31
32 const uint32_t sq_core_pos_to_scmi_dmn_id_map[PLATFORM_CORE_COUNT] = {
33 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
34 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
35 };
36
37 static scmi_channel_plat_info_t sq_scmi_plat_info = {
38 .scmi_mbx_mem = SQ_SCMI_PAYLOAD_BASE,
39 .db_reg_addr = PLAT_SQ_MHU_BASE + MHU_CPU_INTR_S_SET_OFFSET,
40 .db_preserve_mask = 0xfffffffe,
41 .db_modify_mask = 0x1,
42 .ring_doorbell = &mhu_ring_doorbell,
43 };
44
45 /*
46 * SCMI power state parameter bit field encoding for SynQuacer platform.
47 *
48 * 31 20 19 16 15 12 11 8 7 4 3 0
49 * +-------------------------------------------------------------+
50 * | SBZ | Max level | Level 3 | Level 2 | Level 1 | Level 0 |
51 * | | | state | state | state | state |
52 * +-------------------------------------------------------------+
53 *
54 * `Max level` encodes the highest level that has a valid power state
55 * encoded in the power state.
56 */
57 #define SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT 16
58 #define SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH 4
59 #define SCMI_PWR_STATE_MAX_PWR_LVL_MASK \
60 ((1 << SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH) - 1)
61 #define SCMI_SET_PWR_STATE_MAX_PWR_LVL(_power_state, _max_level) \
62 (_power_state) |= ((_max_level) & SCMI_PWR_STATE_MAX_PWR_LVL_MASK)\
63 << SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT
64 #define SCMI_GET_PWR_STATE_MAX_PWR_LVL(_power_state) \
65 (((_power_state) >> SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT) \
66 & SCMI_PWR_STATE_MAX_PWR_LVL_MASK)
67
68 #define SCMI_PWR_STATE_LVL_WIDTH 4
69 #define SCMI_PWR_STATE_LVL_MASK \
70 ((1 << SCMI_PWR_STATE_LVL_WIDTH) - 1)
71 #define SCMI_SET_PWR_STATE_LVL(_power_state, _level, _level_state) \
72 (_power_state) |= ((_level_state) & SCMI_PWR_STATE_LVL_MASK) \
73 << (SCMI_PWR_STATE_LVL_WIDTH * (_level))
74 #define SCMI_GET_PWR_STATE_LVL(_power_state, _level) \
75 (((_power_state) >> (SCMI_PWR_STATE_LVL_WIDTH * (_level))) & \
76 SCMI_PWR_STATE_LVL_MASK)
77
78 /*
79 * The SCMI power state enumeration for a power domain level
80 */
81 typedef enum {
82 scmi_power_state_off = 0,
83 scmi_power_state_on = 1,
84 scmi_power_state_sleep = 2,
85 } scmi_power_state_t;
86
87 /*
88 * The global handle for invoking the SCMI driver APIs after the driver
89 * has been initialized.
90 */
91 static void *sq_scmi_handle;
92
93 /* The SCMI channel global object */
94 static scmi_channel_t channel;
95
96 /*
97 * Helper function to turn off a CPU power domain and
98 * its parent power domains if applicable.
99 */
sq_scmi_off(const struct psci_power_state * target_state)100 void sq_scmi_off(const struct psci_power_state *target_state)
101 {
102 int lvl = 0, ret;
103 uint32_t scmi_pwr_state = 0;
104
105 /* At-least the CPU level should be specified to be OFF */
106 assert(target_state->pwr_domain_state[SQ_PWR_LVL0] ==
107 SQ_LOCAL_STATE_OFF);
108
109 for (; lvl <= PLAT_MAX_PWR_LVL; lvl++) {
110 if (target_state->pwr_domain_state[lvl] == SQ_LOCAL_STATE_RUN)
111 break;
112
113 assert(target_state->pwr_domain_state[lvl] ==
114 SQ_LOCAL_STATE_OFF);
115 SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl,
116 scmi_power_state_off);
117 }
118
119 SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1);
120
121 ret = scmi_pwr_state_set(sq_scmi_handle,
122 sq_core_pos_to_scmi_dmn_id_map[plat_my_core_pos()],
123 scmi_pwr_state);
124
125 if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) {
126 ERROR("SCMI set power state command return 0x%x unexpected\n",
127 ret);
128 panic();
129 }
130 }
131
132 /*
133 * Helper function to turn ON a CPU power domain and
134 *its parent power domains if applicable.
135 */
sq_scmi_on(u_register_t mpidr)136 void sq_scmi_on(u_register_t mpidr)
137 {
138 int lvl = 0, ret, core_pos;
139 uint32_t scmi_pwr_state = 0;
140
141 for (; lvl <= PLAT_MAX_PWR_LVL; lvl++)
142 SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl,
143 scmi_power_state_on);
144
145 SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1);
146
147 core_pos = plat_core_pos_by_mpidr(mpidr);
148 assert(core_pos >= 0 && core_pos < PLATFORM_CORE_COUNT);
149
150 ret = scmi_pwr_state_set(sq_scmi_handle,
151 sq_core_pos_to_scmi_dmn_id_map[core_pos],
152 scmi_pwr_state);
153
154 if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) {
155 ERROR("SCMI set power state command return 0x%x unexpected\n",
156 ret);
157 panic();
158 }
159 }
160
sq_scmi_system_off(int state)161 void __dead2 sq_scmi_system_off(int state)
162 {
163 int ret;
164
165 /*
166 * Disable GIC CPU interface to prevent pending interrupt from waking
167 * up the AP from WFI.
168 */
169 sq_gic_cpuif_disable();
170
171 /*
172 * Issue SCMI command. First issue a graceful
173 * request and if that fails force the request.
174 */
175 ret = scmi_sys_pwr_state_set(sq_scmi_handle,
176 SCMI_SYS_PWR_FORCEFUL_REQ,
177 state);
178
179 if (ret != SCMI_E_SUCCESS) {
180 ERROR("SCMI system power state set 0x%x returns unexpected 0x%x\n",
181 state, ret);
182 panic();
183 }
184 wfi();
185 ERROR("SCMI set power state: operation not handled.\n");
186 panic();
187 }
188
189 /*
190 * Helper function to reset the system via SCMI.
191 */
sq_scmi_sys_reboot(void)192 void __dead2 sq_scmi_sys_reboot(void)
193 {
194 sq_scmi_system_off(SCMI_SYS_PWR_COLD_RESET);
195 }
196
scmi_ap_core_init(scmi_channel_t * ch)197 static int scmi_ap_core_init(scmi_channel_t *ch)
198 {
199 #if PROGRAMMABLE_RESET_ADDRESS
200 uint32_t version;
201 int ret;
202
203 ret = scmi_proto_version(ch, SCMI_AP_CORE_PROTO_ID, &version);
204 if (ret != SCMI_E_SUCCESS) {
205 WARN("SCMI AP core protocol version message failed\n");
206 return -1;
207 }
208
209 if (!is_scmi_version_compatible(SCMI_AP_CORE_PROTO_VER, version)) {
210 WARN("SCMI AP core protocol version 0x%x incompatible with driver version 0x%x\n",
211 version, SCMI_AP_CORE_PROTO_VER);
212 return -1;
213 }
214 INFO("SCMI AP core protocol version 0x%x detected\n", version);
215 #endif
216 return 0;
217 }
218
plat_sq_pwrc_setup(void)219 void __init plat_sq_pwrc_setup(void)
220 {
221 channel.info = &sq_scmi_plat_info;
222 channel.lock = SQ_SCMI_LOCK_GET_INSTANCE;
223 sq_scmi_handle = scmi_init(&channel);
224 if (sq_scmi_handle == NULL) {
225 ERROR("SCMI Initialization failed\n");
226 panic();
227 }
228 if (scmi_ap_core_init(&channel) < 0) {
229 ERROR("SCMI AP core protocol initialization failed\n");
230 panic();
231 }
232 }
233
sq_scmi_get_draminfo(struct draminfo * info)234 uint32_t sq_scmi_get_draminfo(struct draminfo *info)
235 {
236 scmi_get_draminfo(sq_scmi_handle, info);
237
238 return 0;
239 }
240