armv8: layerscape: clean exported symbols in spintable.S
[platform/kernel/u-boot.git] / arch / arm / cpu / armv8 / fsl-layerscape / mp.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2014-2015 Freescale Semiconductor, Inc.
4  */
5
6 #include <common.h>
7 #include <cpu_func.h>
8 #include <image.h>
9 #include <log.h>
10 #include <asm/cache.h>
11 #include <asm/io.h>
12 #include <asm/system.h>
13 #include <asm/arch/mp.h>
14 #include <asm/arch/soc.h>
15 #include <linux/delay.h>
16 #include "cpu.h"
17 #include <asm/arch-fsl-layerscape/soc.h>
18 #include <efi_loader.h>
19
20 DECLARE_GLOBAL_DATA_PTR;
21
22 void *get_spin_tbl_addr(void)
23 {
24         /* the spin table is at the beginning */
25         return secondary_boot_code_start;
26 }
27
28 void update_os_arch_secondary_cores(uint8_t os_arch)
29 {
30         u64 *table = get_spin_tbl_addr();
31         int i;
32
33         for (i = 1; i < CONFIG_MAX_CPUS; i++) {
34                 if (os_arch == IH_ARCH_DEFAULT)
35                         table[i * WORDS_PER_SPIN_TABLE_ENTRY +
36                                 SPIN_TABLE_ELEM_ARCH_COMP_IDX] = OS_ARCH_SAME;
37                 else
38                         table[i * WORDS_PER_SPIN_TABLE_ENTRY +
39                                 SPIN_TABLE_ELEM_ARCH_COMP_IDX] = OS_ARCH_DIFF;
40         }
41 }
42
43 #ifdef CONFIG_FSL_LSCH3
44 static void wake_secondary_core_n(int cluster, int core, int cluster_cores)
45 {
46         struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
47         struct ccsr_reset __iomem *rst = (void *)(CONFIG_SYS_FSL_RST_ADDR);
48         u32 mpidr = 0;
49
50         mpidr = ((cluster << 8) | core);
51         /*
52          * mpidr_el1 register value of core which needs to be released
53          * is written to scratchrw[6] register
54          */
55         gur_out32(&gur->scratchrw[6], mpidr);
56         asm volatile("dsb st" : : : "memory");
57         rst->brrl |= 1 << ((cluster * cluster_cores) + core);
58         asm volatile("dsb st" : : : "memory");
59         /*
60          * scratchrw[6] register value is polled
61          * when the value becomes zero, this means that this core is up
62          * and running, next core can be released now
63          */
64         while (gur_in32(&gur->scratchrw[6]) != 0)
65                 ;
66 }
67 #endif
68
69 int fsl_layerscape_wake_seconday_cores(void)
70 {
71         struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
72 #ifdef CONFIG_FSL_LSCH3
73         struct ccsr_reset __iomem *rst = (void *)(CONFIG_SYS_FSL_RST_ADDR);
74         u32 svr, ver, cluster, type;
75         int j = 0, cluster_cores = 0;
76 #elif defined(CONFIG_FSL_LSCH2)
77         struct ccsr_scfg __iomem *scfg = (void *)(CONFIG_SYS_FSL_SCFG_ADDR);
78 #endif
79         u32 cores, cpu_up_mask = 1;
80         int i, timeout = 10;
81         u64 *table;
82
83 #ifdef COUNTER_FREQUENCY_REAL
84         /* update for secondary cores */
85         __real_cntfrq = COUNTER_FREQUENCY_REAL;
86         flush_dcache_range((unsigned long)&__real_cntfrq,
87                            (unsigned long)&__real_cntfrq + 8);
88 #endif
89
90         cores = cpu_mask();
91         /* Clear spin table so that secondary processors
92          * observe the correct value after waking up from wfe.
93          */
94         table = get_spin_tbl_addr();
95         memset(table, 0, CONFIG_MAX_CPUS*SPIN_TABLE_ELEM_SIZE);
96         flush_dcache_range((unsigned long)table,
97                            (unsigned long)table +
98                            (CONFIG_MAX_CPUS*SPIN_TABLE_ELEM_SIZE));
99
100         debug("Waking secondary cores to start from %lx\n", gd->relocaddr);
101
102 #ifdef CONFIG_FSL_LSCH3
103         gur_out32(&gur->bootlocptrh, (u32)(gd->relocaddr >> 32));
104         gur_out32(&gur->bootlocptrl, (u32)gd->relocaddr);
105
106         svr = gur_in32(&gur->svr);
107         ver = SVR_SOC_VER(svr);
108         if (ver == SVR_LS2080A || ver == SVR_LS2085A) {
109                 gur_out32(&gur->scratchrw[6], 1);
110                 asm volatile("dsb st" : : : "memory");
111                 rst->brrl = cores;
112                 asm volatile("dsb st" : : : "memory");
113         } else {
114                 /*
115                  * Release the cores out of reset one-at-a-time to avoid
116                  * power spikes
117                  */
118                 i = 0;
119                 cluster = in_le32(&gur->tp_cluster[i].lower);
120                 for (j = 0; j < TP_INIT_PER_CLUSTER; j++) {
121                         type = initiator_type(cluster, j);
122                         if (type &&
123                             TP_ITYP_TYPE(type) == TP_ITYP_TYPE_ARM)
124                                 cluster_cores++;
125                 }
126
127                 do {
128                         cluster = in_le32(&gur->tp_cluster[i].lower);
129                         for (j = 0; j < TP_INIT_PER_CLUSTER; j++) {
130                                 type = initiator_type(cluster, j);
131                                 if (type &&
132                                     TP_ITYP_TYPE(type) == TP_ITYP_TYPE_ARM)
133                                         wake_secondary_core_n(i, j,
134                                                               cluster_cores);
135                         }
136                 i++;
137                 } while ((cluster & TP_CLUSTER_EOC) != TP_CLUSTER_EOC);
138         }
139 #elif defined(CONFIG_FSL_LSCH2)
140         scfg_out32(&scfg->scratchrw[0], (u32)(gd->relocaddr >> 32));
141         scfg_out32(&scfg->scratchrw[1], (u32)gd->relocaddr);
142         asm volatile("dsb st" : : : "memory");
143         gur_out32(&gur->brrl, cores);
144         asm volatile("dsb st" : : : "memory");
145
146         /* Bootup online cores */
147         scfg_out32(&scfg->corebcr, cores);
148 #endif
149         /* This is needed as a precautionary measure.
150          * If some code before this has accidentally  released the secondary
151          * cores then the pre-bootloader code will trap them in a "wfe" unless
152          * the scratchrw[6] is set. In this case we need a sev here to get these
153          * cores moving again.
154          */
155         asm volatile("sev");
156
157         while (timeout--) {
158                 flush_dcache_range((unsigned long)table, (unsigned long)table +
159                                    CONFIG_MAX_CPUS * 64);
160                 for (i = 1; i < CONFIG_MAX_CPUS; i++) {
161                         if (table[i * WORDS_PER_SPIN_TABLE_ENTRY +
162                                         SPIN_TABLE_ELEM_STATUS_IDX])
163                                 cpu_up_mask |= 1 << i;
164                 }
165                 if (hweight32(cpu_up_mask) == hweight32(cores))
166                         break;
167                 udelay(10);
168         }
169         if (timeout <= 0) {
170                 printf("CPU:   Failed to bring up some cores (mask 0x%x)\n",
171                        cores ^ cpu_up_mask);
172                 return 1;
173         }
174         printf("CPU:   %d cores online\n", hweight32(cores));
175
176         return 0;
177 }
178
179 int is_core_valid(unsigned int core)
180 {
181         return !!((1 << core) & cpu_mask());
182 }
183
184 static int is_pos_valid(unsigned int pos)
185 {
186         return !!((1 << pos) & cpu_pos_mask());
187 }
188
189 int is_core_online(u64 cpu_id)
190 {
191         u64 *table = get_spin_tbl_addr();
192         int pos = id_to_core(cpu_id);
193         table += pos * WORDS_PER_SPIN_TABLE_ENTRY;
194         return table[SPIN_TABLE_ELEM_STATUS_IDX] == 1;
195 }
196
197 int cpu_reset(u32 nr)
198 {
199         puts("Feature is not implemented.\n");
200
201         return 0;
202 }
203
204 int cpu_disable(u32 nr)
205 {
206         puts("Feature is not implemented.\n");
207
208         return 0;
209 }
210
211 static int core_to_pos(int nr)
212 {
213         u32 cores = cpu_pos_mask();
214         int i, count = 0;
215
216         if (nr == 0) {
217                 return 0;
218         } else if (nr >= hweight32(cores)) {
219                 puts("Not a valid core number.\n");
220                 return -1;
221         }
222
223         for (i = 1; i < 32; i++) {
224                 if (is_pos_valid(i)) {
225                         count++;
226                         if (count == nr)
227                                 break;
228                 }
229         }
230
231         if (count != nr)
232                 return -1;
233
234         return i;
235 }
236
237 int cpu_status(u32 nr)
238 {
239         u64 *table = get_spin_tbl_addr();
240         int pos;
241
242         if (nr == 0) {
243                 printf("table base @ 0x%p\n", table);
244         } else {
245                 pos = core_to_pos(nr);
246                 if (pos < 0)
247                         return -1;
248                 table += pos * WORDS_PER_SPIN_TABLE_ENTRY;
249                 printf("table @ 0x%p\n", table);
250                 printf("   addr - 0x%016llx\n",
251                        table[SPIN_TABLE_ELEM_ENTRY_ADDR_IDX]);
252                 printf("   status   - 0x%016llx\n",
253                        table[SPIN_TABLE_ELEM_STATUS_IDX]);
254                 printf("   lpid  - 0x%016llx\n",
255                        table[SPIN_TABLE_ELEM_LPID_IDX]);
256         }
257
258         return 0;
259 }
260
261 int cpu_release(u32 nr, int argc, char *const argv[])
262 {
263         u64 boot_addr;
264         u64 *table = get_spin_tbl_addr();
265         int pos;
266
267         pos = core_to_pos(nr);
268         if (pos <= 0)
269                 return -1;
270
271         table += pos * WORDS_PER_SPIN_TABLE_ENTRY;
272         boot_addr = simple_strtoull(argv[0], NULL, 16);
273         table[SPIN_TABLE_ELEM_ENTRY_ADDR_IDX] = boot_addr;
274         flush_dcache_range((unsigned long)table,
275                            (unsigned long)table + SPIN_TABLE_ELEM_SIZE);
276         asm volatile("dsb st");
277
278         /*
279          * The secondary CPUs polling the spin-table above for a non-zero
280          * value. To save power "wfe" is called. Thus call "sev" here to
281          * wake the CPUs and let them check the spin-table again (see
282          * slave_cpu loop in lowlevel.S)
283          */
284         asm volatile("sev");
285
286         return 0;
287 }