target: add generic Xtensa LX support
[fw/openocd] / src / target / espressif / esp32s3.c
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 /***************************************************************************
4  *   ESP32-S3 target API for OpenOCD                                       *
5  *   Copyright (C) 2020 Espressif Systems Ltd.                             *
6  ***************************************************************************/
7
8 #ifdef HAVE_CONFIG_H
9 #include "config.h"
10 #endif
11
12 #include <helper/time_support.h>
13 #include <target/target.h>
14 #include <target/target_type.h>
15 #include <target/smp.h>
16 #include "assert.h"
17 #include "esp_xtensa_smp.h"
18
19 /*
20 This is a JTAG driver for the ESP32_S3, the are two Tensilica cores inside
21 the ESP32_S3 chip. For more information please have a look into ESP32_S3 target
22 implementation.
23 */
24
25 /* ESP32_S3 memory map */
26 #define ESP32_S3_IRAM_LOW               0x40370000
27 #define ESP32_S3_IRAM_HIGH              0x403E0000
28 #define ESP32_S3_IROM_MASK_LOW          0x40000000
29 #define ESP32_S3_IROM_MASK_HIGH         0x40060000
30 #define ESP32_S3_DRAM_LOW               0x3FC88000
31 #define ESP32_S3_DRAM_HIGH              0x3FD00000
32 #define ESP32_S3_RTC_IRAM_LOW           0x600FE000
33 #define ESP32_S3_RTC_IRAM_HIGH          0x60100000
34 #define ESP32_S3_RTC_DRAM_LOW           0x600FE000
35 #define ESP32_S3_RTC_DRAM_HIGH          0x60100000
36 #define ESP32_S3_RTC_DATA_LOW           0x50000000
37 #define ESP32_S3_RTC_DATA_HIGH          0x50002000
38 #define ESP32_S3_EXTRAM_DATA_LOW        0x3D000000
39 #define ESP32_S3_EXTRAM_DATA_HIGH       0x3E000000
40 #define ESP32_S3_SYS_RAM_LOW            0x60000000UL
41 #define ESP32_S3_SYS_RAM_HIGH           (ESP32_S3_SYS_RAM_LOW + 0x10000000UL)
42 #define ESP32_S3_RTC_SLOW_MEM_BASE      ESP32_S3_RTC_DATA_LOW
43
44 /* ESP32_S3 WDT */
45 #define ESP32_S3_WDT_WKEY_VALUE       0x50D83AA1
46 #define ESP32_S3_TIMG0_BASE           0x6001F000
47 #define ESP32_S3_TIMG1_BASE           0x60020000
48 #define ESP32_S3_TIMGWDT_CFG0_OFF     0x48
49 #define ESP32_S3_TIMGWDT_PROTECT_OFF  0x64
50 #define ESP32_S3_TIMG0WDT_CFG0        (ESP32_S3_TIMG0_BASE + ESP32_S3_TIMGWDT_CFG0_OFF)
51 #define ESP32_S3_TIMG1WDT_CFG0        (ESP32_S3_TIMG1_BASE + ESP32_S3_TIMGWDT_CFG0_OFF)
52 #define ESP32_S3_TIMG0WDT_PROTECT     (ESP32_S3_TIMG0_BASE + ESP32_S3_TIMGWDT_PROTECT_OFF)
53 #define ESP32_S3_TIMG1WDT_PROTECT     (ESP32_S3_TIMG1_BASE + ESP32_S3_TIMGWDT_PROTECT_OFF)
54 #define ESP32_S3_RTCCNTL_BASE         0x60008000
55 #define ESP32_S3_RTCWDT_CFG_OFF       0x98
56 #define ESP32_S3_RTCWDT_PROTECT_OFF   0xB0
57 #define ESP32_S3_SWD_CONF_OFF         0xB0
58 #define ESP32_S3_SWD_WPROTECT_OFF     0xB4
59 #define ESP32_S3_RTCWDT_CFG           (ESP32_S3_RTCCNTL_BASE + ESP32_S3_RTCWDT_CFG_OFF)
60 #define ESP32_S3_RTCWDT_PROTECT       (ESP32_S3_RTCCNTL_BASE + ESP32_S3_RTCWDT_PROTECT_OFF)
61 #define ESP32_S3_SWD_CONF_REG         (ESP32_S3_RTCCNTL_BASE + ESP32_S3_SWD_CONF_OFF)
62 #define ESP32_S3_SWD_WPROTECT_REG     (ESP32_S3_RTCCNTL_BASE + ESP32_S3_SWD_WPROTECT_OFF)
63 #define ESP32_S3_SWD_AUTO_FEED_EN_M   BIT(31)
64 #define ESP32_S3_SWD_WKEY_VALUE       0x8F1D312AU
65
66 #define ESP32_S3_TRACEMEM_BLOCK_SZ    0x4000
67
68 /* ESP32_S3 dport regs */
69 #define ESP32_S3_DR_REG_SYSTEM_BASE                0x600c0000
70 #define ESP32_S3_SYSTEM_CORE_1_CONTROL_0_REG       (ESP32_S3_DR_REG_SYSTEM_BASE + 0x014)
71 #define ESP32_S3_SYSTEM_CONTROL_CORE_1_CLKGATE_EN  BIT(1)
72
73 /* ESP32_S3 RTC regs */
74 #define ESP32_S3_RTC_CNTL_SW_CPU_STALL_REG (ESP32_S3_RTCCNTL_BASE + 0xBC)
75 #define ESP32_S3_RTC_CNTL_SW_CPU_STALL_DEF 0x0
76
77 struct esp32s3_common {
78         struct esp_xtensa_smp_common esp_xtensa_smp;
79 };
80
81 /* Reset ESP32-S3's peripherals.
82  * 1. OpenOCD makes sure the target is halted; if not, tries to halt it.
83  *    If that fails, tries to reset it (via OCD) and then halt.
84  * 2. OpenOCD loads the stub code into RTC_SLOW_MEM.
85  * 3. Executes the stub code from address 0x50000004.
86  * 4. The stub code changes the reset vector to 0x50000000, and triggers
87  *    a system reset using RTC_CNTL_SW_SYS_RST bit.
88  * 5. Once the PRO CPU is out of reset, it executes the stub code from address 0x50000000.
89  *    The stub code disables the watchdog, re-enables JTAG and the APP CPU,
90  *    restores the reset vector, and enters an infinite loop.
91  * 6. OpenOCD waits until it can talk to the OCD module again, then halts the target.
92  * 7. OpenOCD restores the contents of RTC_SLOW_MEM.
93  *
94  * End result: all the peripherals except RTC_CNTL are reset, CPU's PC is undefined,
95  * PRO CPU is halted, APP CPU is in reset.
96  */
97
98 const uint8_t esp32s3_reset_stub_code[] = {
99 #include "../../../contrib/loaders/reset/espressif/esp32s3/cpu_reset_handler_code.inc"
100 };
101
102 static int esp32s3_soc_reset(struct target *target)
103 {
104         int res;
105         struct target_list *head;
106         struct xtensa *xtensa;
107
108         LOG_DEBUG("start");
109         /* In order to write to peripheral registers, target must be halted first */
110         if (target->state != TARGET_HALTED) {
111                 LOG_DEBUG("Target not halted before SoC reset, trying to halt it first");
112                 xtensa_halt(target);
113                 res = target_wait_state(target, TARGET_HALTED, 1000);
114                 if (res != ERROR_OK) {
115                         LOG_DEBUG("Couldn't halt target before SoC reset, trying to do reset-halt");
116                         res = xtensa_assert_reset(target);
117                         if (res != ERROR_OK) {
118                                 LOG_ERROR(
119                                         "Couldn't halt target before SoC reset! (xtensa_assert_reset returned %d)",
120                                         res);
121                                 return res;
122                         }
123                         alive_sleep(10);
124                         xtensa_poll(target);
125                         bool reset_halt_save = target->reset_halt;
126                         target->reset_halt = true;
127                         res = xtensa_deassert_reset(target);
128                         target->reset_halt = reset_halt_save;
129                         if (res != ERROR_OK) {
130                                 LOG_ERROR(
131                                         "Couldn't halt target before SoC reset! (xtensa_deassert_reset returned %d)",
132                                         res);
133                                 return res;
134                         }
135                         alive_sleep(10);
136                         xtensa_poll(target);
137                         xtensa_halt(target);
138                         res = target_wait_state(target, TARGET_HALTED, 1000);
139                         if (res != ERROR_OK) {
140                                 LOG_ERROR("Couldn't halt target before SoC reset");
141                                 return res;
142                         }
143                 }
144         }
145
146         if (target->smp) {
147                 foreach_smp_target(head, target->smp_targets) {
148                         xtensa = target_to_xtensa(head->target);
149                         /* if any of the cores is stalled unstall them */
150                         if (xtensa_dm_core_is_stalled(&xtensa->dbg_mod)) {
151                                 LOG_TARGET_DEBUG(head->target, "Unstall CPUs before SW reset!");
152                                 res = target_write_u32(target,
153                                         ESP32_S3_RTC_CNTL_SW_CPU_STALL_REG,
154                                         ESP32_S3_RTC_CNTL_SW_CPU_STALL_DEF);
155                                 if (res != ERROR_OK) {
156                                         LOG_TARGET_ERROR(head->target, "Failed to unstall CPUs before SW reset!");
157                                         return res;
158                                 }
159                                 break;  /* both cores are unstalled now, so exit the loop */
160                         }
161                 }
162         }
163
164         LOG_DEBUG("Loading stub code into RTC RAM");
165         uint8_t slow_mem_save[sizeof(esp32s3_reset_stub_code)];
166
167         /* Save contents of RTC_SLOW_MEM which we are about to overwrite */
168         res = target_read_buffer(target, ESP32_S3_RTC_SLOW_MEM_BASE, sizeof(slow_mem_save), slow_mem_save);
169         if (res != ERROR_OK) {
170                 LOG_ERROR("Failed to save contents of RTC_SLOW_MEM (%d)!", res);
171                 return res;
172         }
173
174         /* Write stub code into RTC_SLOW_MEM */
175         res = target_write_buffer(target,
176                 ESP32_S3_RTC_SLOW_MEM_BASE,
177                 sizeof(esp32s3_reset_stub_code),
178                 esp32s3_reset_stub_code);
179         if (res != ERROR_OK) {
180                 LOG_ERROR("Failed to write stub (%d)!", res);
181                 return res;
182         }
183
184         LOG_DEBUG("Resuming the target");
185         xtensa = target_to_xtensa(target);
186         xtensa->suppress_dsr_errors = true;
187         res = xtensa_resume(target, 0, ESP32_S3_RTC_SLOW_MEM_BASE + 4, 0, 0);
188         xtensa->suppress_dsr_errors = false;
189         if (res != ERROR_OK) {
190                 LOG_ERROR("Failed to run stub (%d)!", res);
191                 return res;
192         }
193         LOG_DEBUG("resume done, waiting for the target to come alive");
194
195         /* Wait for SoC to reset */
196         alive_sleep(100);
197         int64_t timeout = timeval_ms() + 100;
198         bool get_timeout = false;
199         while (target->state != TARGET_RESET && target->state != TARGET_RUNNING) {
200                 alive_sleep(10);
201                 xtensa_poll(target);
202                 if (timeval_ms() >= timeout) {
203                         LOG_TARGET_ERROR(target,
204                                 "Timed out waiting for CPU to be reset, target state=%d",
205                                 target->state);
206                         get_timeout = true;
207                         break;
208                 }
209         }
210
211         /* Halt the CPU again */
212         LOG_DEBUG("halting the target");
213         xtensa_halt(target);
214         res = target_wait_state(target, TARGET_HALTED, 1000);
215         if (res == ERROR_OK) {
216                 LOG_DEBUG("restoring RTC_SLOW_MEM");
217                 res = target_write_buffer(target, ESP32_S3_RTC_SLOW_MEM_BASE, sizeof(slow_mem_save), slow_mem_save);
218                 if (res != ERROR_OK)
219                         LOG_TARGET_ERROR(target, "Failed to restore contents of RTC_SLOW_MEM (%d)!", res);
220         } else {
221                 LOG_TARGET_ERROR(target, "Timed out waiting for CPU to be halted after SoC reset");
222         }
223
224         return get_timeout ? ERROR_TARGET_TIMEOUT : res;
225 }
226
227 static int esp32s3_disable_wdts(struct target *target)
228 {
229         /* TIMG1 WDT */
230         int res = target_write_u32(target, ESP32_S3_TIMG0WDT_PROTECT, ESP32_S3_WDT_WKEY_VALUE);
231         if (res != ERROR_OK) {
232                 LOG_ERROR("Failed to write ESP32_S3_TIMG0WDT_PROTECT (%d)!", res);
233                 return res;
234         }
235         res = target_write_u32(target, ESP32_S3_TIMG0WDT_CFG0, 0);
236         if (res != ERROR_OK) {
237                 LOG_ERROR("Failed to write ESP32_S3_TIMG0WDT_CFG0 (%d)!", res);
238                 return res;
239         }
240         /* TIMG2 WDT */
241         res = target_write_u32(target, ESP32_S3_TIMG1WDT_PROTECT, ESP32_S3_WDT_WKEY_VALUE);
242         if (res != ERROR_OK) {
243                 LOG_ERROR("Failed to write ESP32_S3_TIMG1WDT_PROTECT (%d)!", res);
244                 return res;
245         }
246         res = target_write_u32(target, ESP32_S3_TIMG1WDT_CFG0, 0);
247         if (res != ERROR_OK) {
248                 LOG_ERROR("Failed to write ESP32_S3_TIMG1WDT_CFG0 (%d)!", res);
249                 return res;
250         }
251         /* RTC WDT */
252         res = target_write_u32(target, ESP32_S3_RTCWDT_PROTECT, ESP32_S3_WDT_WKEY_VALUE);
253         if (res != ERROR_OK) {
254                 LOG_ERROR("Failed to write ESP32_S3_RTCWDT_PROTECT (%d)!", res);
255                 return res;
256         }
257         res = target_write_u32(target, ESP32_S3_RTCWDT_CFG, 0);
258         if (res != ERROR_OK) {
259                 LOG_ERROR("Failed to write ESP32_S3_RTCWDT_CFG (%d)!", res);
260                 return res;
261         }
262         /* Enable SWD auto-feed */
263         res = target_write_u32(target, ESP32_S3_SWD_WPROTECT_REG, ESP32_S3_SWD_WKEY_VALUE);
264         if (res != ERROR_OK) {
265                 LOG_ERROR("Failed to write ESP32_S3_SWD_WPROTECT_REG (%d)!", res);
266                 return res;
267         }
268         uint32_t swd_conf_reg = 0;
269         res = target_read_u32(target, ESP32_S3_SWD_CONF_REG, &swd_conf_reg);
270         if (res != ERROR_OK) {
271                 LOG_ERROR("Failed to read ESP32_S3_SWD_CONF_REG (%d)!", res);
272                 return res;
273         }
274         swd_conf_reg |= ESP32_S3_SWD_AUTO_FEED_EN_M;
275         res = target_write_u32(target, ESP32_S3_SWD_CONF_REG, swd_conf_reg);
276         if (res != ERROR_OK) {
277                 LOG_ERROR("Failed to write ESP32_S3_SWD_CONF_REG (%d)!", res);
278                 return res;
279         }
280         return ERROR_OK;
281 }
282
283 static int esp32s3_on_halt(struct target *target)
284 {
285         return esp32s3_disable_wdts(target);
286 }
287
288 static int esp32s3_arch_state(struct target *target)
289 {
290         return ERROR_OK;
291 }
292
293 static int esp32s3_virt2phys(struct target *target,
294         target_addr_t virtual, target_addr_t *physical)
295 {
296         if (physical) {
297                 *physical = virtual;
298                 return ERROR_OK;
299         }
300         return ERROR_FAIL;
301 }
302
303 static int esp32s3_target_init(struct command_context *cmd_ctx, struct target *target)
304 {
305         return esp_xtensa_target_init(cmd_ctx, target);
306 }
307
308 static const struct xtensa_debug_ops esp32s3_dbg_ops = {
309         .queue_enable = xtensa_dm_queue_enable,
310         .queue_reg_read = xtensa_dm_queue_reg_read,
311         .queue_reg_write = xtensa_dm_queue_reg_write
312 };
313
314 static const struct xtensa_power_ops esp32s3_pwr_ops = {
315         .queue_reg_read = xtensa_dm_queue_pwr_reg_read,
316         .queue_reg_write = xtensa_dm_queue_pwr_reg_write
317 };
318
319 static const struct esp_xtensa_smp_chip_ops esp32s3_chip_ops = {
320         .reset = esp32s3_soc_reset,
321         .on_halt = esp32s3_on_halt
322 };
323
324 static int esp32s3_target_create(struct target *target, Jim_Interp *interp)
325 {
326         struct xtensa_debug_module_config esp32s3_dm_cfg = {
327                 .dbg_ops = &esp32s3_dbg_ops,
328                 .pwr_ops = &esp32s3_pwr_ops,
329                 .tap = target->tap,
330                 .queue_tdi_idle = NULL,
331                 .queue_tdi_idle_arg = NULL
332         };
333
334         struct esp32s3_common *esp32s3 = calloc(1, sizeof(struct esp32s3_common));
335         if (!esp32s3) {
336                 LOG_ERROR("Failed to alloc memory for arch info!");
337                 return ERROR_FAIL;
338         }
339
340         int ret = esp_xtensa_smp_init_arch_info(target,
341                 &esp32s3->esp_xtensa_smp,
342                 &esp32s3_dm_cfg,
343                 &esp32s3_chip_ops);
344         if (ret != ERROR_OK) {
345                 LOG_ERROR("Failed to init arch info!");
346                 free(esp32s3);
347                 return ret;
348         }
349
350         /* Assume running target. If different, the first poll will fix this. */
351         target->state = TARGET_RUNNING;
352         target->debug_reason = DBG_REASON_NOTHALTED;
353         return ERROR_OK;
354 }
355
356 static const struct command_registration esp32s3_command_handlers[] = {
357         {
358                 .usage = "",
359                 .chain = esp_xtensa_smp_command_handlers,
360         },
361         {
362                 .name = "esp32",
363                 .usage = "",
364                 .chain = smp_command_handlers,
365         },
366         COMMAND_REGISTRATION_DONE
367 };
368
369 /** Holds methods for Xtensa targets. */
370 struct target_type esp32s3_target = {
371         .name = "esp32s3",
372
373         .poll = esp_xtensa_smp_poll,
374         .arch_state = esp32s3_arch_state,
375
376         .halt = xtensa_halt,
377         .resume = esp_xtensa_smp_resume,
378         .step = esp_xtensa_smp_step,
379
380         .assert_reset = esp_xtensa_smp_assert_reset,
381         .deassert_reset = esp_xtensa_smp_deassert_reset,
382         .soft_reset_halt = esp_xtensa_smp_soft_reset_halt,
383
384         .virt2phys = esp32s3_virt2phys,
385         .mmu = xtensa_mmu_is_enabled,
386         .read_memory = xtensa_read_memory,
387         .write_memory = xtensa_write_memory,
388
389         .read_buffer = xtensa_read_buffer,
390         .write_buffer = xtensa_write_buffer,
391
392         .checksum_memory = xtensa_checksum_memory,
393
394         .get_gdb_arch = xtensa_get_gdb_arch,
395         .get_gdb_reg_list = xtensa_get_gdb_reg_list,
396
397         .add_breakpoint = esp_xtensa_breakpoint_add,
398         .remove_breakpoint = esp_xtensa_breakpoint_remove,
399
400         .add_watchpoint = esp_xtensa_smp_watchpoint_add,
401         .remove_watchpoint = esp_xtensa_smp_watchpoint_remove,
402
403         .target_create = esp32s3_target_create,
404         .init_target = esp32s3_target_init,
405         .examine = xtensa_examine,
406         .deinit_target = esp_xtensa_target_deinit,
407
408         .commands = esp32s3_command_handlers,
409 };