]> Git Repo - J-u-boot.git/blob - arch/arm/mach-stm32mp/cpu.c
Merge branch '2023-08-09-misc-cleanups' into next
[J-u-boot.git] / arch / arm / mach-stm32mp / cpu.c
1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
2 /*
3  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
4  */
5
6 #define LOG_CATEGORY LOGC_ARCH
7
8 #include <common.h>
9 #include <clk.h>
10 #include <cpu_func.h>
11 #include <debug_uart.h>
12 #include <env.h>
13 #include <init.h>
14 #include <log.h>
15 #include <lmb.h>
16 #include <misc.h>
17 #include <net.h>
18 #include <asm/io.h>
19 #include <asm/arch/stm32.h>
20 #include <asm/arch/sys_proto.h>
21 #include <asm/global_data.h>
22 #include <dm/device.h>
23 #include <dm/uclass.h>
24 #include <linux/bitops.h>
25 #include <spl.h>
26
27 /*
28  * early TLB into the .data section so that it not get cleared
29  * with 16kB allignment (see TTBR0_BASE_ADDR_MASK)
30  */
31 u8 early_tlb[PGTABLE_SIZE] __section(".data") __aligned(0x4000);
32
33 struct lmb lmb;
34
35 u32 get_bootmode(void)
36 {
37         /* read bootmode from TAMP backup register */
38         return (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_MODE_MASK) >>
39                     TAMP_BOOT_MODE_SHIFT;
40 }
41
42 /*
43  * weak function overidde: set the DDR/SYSRAM executable before to enable the
44  * MMU and configure DACR, for early early_enable_caches (SPL or pre-reloc)
45  */
46 void dram_bank_mmu_setup(int bank)
47 {
48         struct bd_info *bd = gd->bd;
49         int     i;
50         phys_addr_t start;
51         phys_size_t size;
52         bool use_lmb = false;
53         enum dcache_option option;
54
55         if (IS_ENABLED(CONFIG_SPL_BUILD)) {
56 /* STM32_SYSRAM_BASE exist only when SPL is supported */
57 #ifdef CONFIG_SPL
58                 start = ALIGN_DOWN(STM32_SYSRAM_BASE, MMU_SECTION_SIZE);
59                 size = ALIGN(STM32_SYSRAM_SIZE, MMU_SECTION_SIZE);
60 #endif
61         } else if (gd->flags & GD_FLG_RELOC) {
62                 /* bd->bi_dram is available only after relocation */
63                 start = bd->bi_dram[bank].start;
64                 size =  bd->bi_dram[bank].size;
65                 use_lmb = true;
66         } else {
67                 /* mark cacheable and executable the beggining of the DDR */
68                 start = STM32_DDR_BASE;
69                 size = CONFIG_DDR_CACHEABLE_SIZE;
70         }
71
72         for (i = start >> MMU_SECTION_SHIFT;
73              i < (start >> MMU_SECTION_SHIFT) + (size >> MMU_SECTION_SHIFT);
74              i++) {
75                 option = DCACHE_DEFAULT_OPTION;
76                 if (use_lmb && lmb_is_reserved_flags(&lmb, i << MMU_SECTION_SHIFT, LMB_NOMAP))
77                         option = 0; /* INVALID ENTRY in TLB */
78                 set_section_dcache(i, option);
79         }
80 }
81 /*
82  * initialize the MMU and activate cache in SPL or in U-Boot pre-reloc stage
83  * MMU/TLB is updated in enable_caches() for U-Boot after relocation
84  * or is deactivated in U-Boot entry function start.S::cpu_init_cp15
85  */
86 static void early_enable_caches(void)
87 {
88         /* I-cache is already enabled in start.S: cpu_init_cp15 */
89
90         if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
91                 return;
92
93         if (!(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))) {
94                 gd->arch.tlb_size = PGTABLE_SIZE;
95                 gd->arch.tlb_addr = (unsigned long)&early_tlb;
96         }
97
98         /* enable MMU (default configuration) */
99         dcache_enable();
100 }
101
102 /*
103  * Early system init
104  */
105 int arch_cpu_init(void)
106 {
107         early_enable_caches();
108
109         /* early armv7 timer init: needed for polling */
110         timer_init();
111
112         return 0;
113 }
114
115 /* weak function for SOC specific initialization */
116 __weak void stm32mp_cpu_init(void)
117 {
118 }
119
120 int mach_cpu_init(void)
121 {
122         u32 boot_mode;
123
124         stm32mp_cpu_init();
125
126         boot_mode = get_bootmode();
127
128         if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) &&
129             (boot_mode & TAMP_BOOT_DEVICE_MASK) == BOOT_SERIAL_UART)
130                 gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE;
131         else if (IS_ENABLED(CONFIG_DEBUG_UART) && IS_ENABLED(CONFIG_SPL_BUILD))
132                 debug_uart_init();
133
134         return 0;
135 }
136
137 void enable_caches(void)
138 {
139         /* parse device tree when data cache is still activated */
140         lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
141
142         /* I-cache is already enabled in start.S: icache_enable() not needed */
143
144         /* deactivate the data cache, early enabled in arch_cpu_init() */
145         dcache_disable();
146         /*
147          * update MMU after relocation and enable the data cache
148          * warning: the TLB location udpated in board_f.c::reserve_mmu
149          */
150         dcache_enable();
151 }
152
153 /* used when CONFIG_DISPLAY_CPUINFO is activated */
154 int print_cpuinfo(void)
155 {
156         char name[SOC_NAME_SIZE];
157
158         get_soc_name(name);
159         printf("CPU: %s\n", name);
160
161         return 0;
162 }
163
164 static void setup_boot_mode(void)
165 {
166         const u32 serial_addr[] = {
167                 STM32_USART1_BASE,
168                 STM32_USART2_BASE,
169                 STM32_USART3_BASE,
170                 STM32_UART4_BASE,
171                 STM32_UART5_BASE,
172                 STM32_USART6_BASE,
173                 STM32_UART7_BASE,
174                 STM32_UART8_BASE
175         };
176         const u32 sdmmc_addr[] = {
177                 STM32_SDMMC1_BASE,
178                 STM32_SDMMC2_BASE,
179                 STM32_SDMMC3_BASE
180         };
181         char cmd[60];
182         u32 boot_ctx = readl(TAMP_BOOT_CONTEXT);
183         u32 boot_mode =
184                 (boot_ctx & TAMP_BOOT_MODE_MASK) >> TAMP_BOOT_MODE_SHIFT;
185         unsigned int instance = (boot_mode & TAMP_BOOT_INSTANCE_MASK) - 1;
186         u32 forced_mode = (boot_ctx & TAMP_BOOT_FORCED_MASK);
187         struct udevice *dev;
188
189         log_debug("%s: boot_ctx=0x%x => boot_mode=%x, instance=%d forced=%x\n",
190                   __func__, boot_ctx, boot_mode, instance, forced_mode);
191         switch (boot_mode & TAMP_BOOT_DEVICE_MASK) {
192         case BOOT_SERIAL_UART:
193                 if (instance >= ARRAY_SIZE(serial_addr))
194                         break;
195                 /* serial : search associated node in devicetree */
196                 sprintf(cmd, "serial@%x", serial_addr[instance]);
197                 if (uclass_get_device_by_name(UCLASS_SERIAL, cmd, &dev)) {
198                         /* restore console on error */
199                         if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL))
200                                 gd->flags &= ~(GD_FLG_SILENT |
201                                                GD_FLG_DISABLE_CONSOLE);
202                         log_err("uart%d = %s not found in device tree!\n",
203                                 instance + 1, cmd);
204                         break;
205                 }
206                 sprintf(cmd, "%d", dev_seq(dev));
207                 env_set("boot_device", "serial");
208                 env_set("boot_instance", cmd);
209
210                 /* restore console on uart when not used */
211                 if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) && gd->cur_serial_dev != dev) {
212                         gd->flags &= ~(GD_FLG_SILENT |
213                                        GD_FLG_DISABLE_CONSOLE);
214                         log_info("serial boot with console enabled!\n");
215                 }
216                 break;
217         case BOOT_SERIAL_USB:
218                 env_set("boot_device", "usb");
219                 env_set("boot_instance", "0");
220                 break;
221         case BOOT_FLASH_SD:
222         case BOOT_FLASH_EMMC:
223                 if (instance >= ARRAY_SIZE(sdmmc_addr))
224                         break;
225                 /* search associated sdmmc node in devicetree */
226                 sprintf(cmd, "mmc@%x", sdmmc_addr[instance]);
227                 if (uclass_get_device_by_name(UCLASS_MMC, cmd, &dev)) {
228                         printf("mmc%d = %s not found in device tree!\n",
229                                instance, cmd);
230                         break;
231                 }
232                 sprintf(cmd, "%d", dev_seq(dev));
233                 env_set("boot_device", "mmc");
234                 env_set("boot_instance", cmd);
235                 break;
236         case BOOT_FLASH_NAND:
237                 env_set("boot_device", "nand");
238                 env_set("boot_instance", "0");
239                 break;
240         case BOOT_FLASH_SPINAND:
241                 env_set("boot_device", "spi-nand");
242                 env_set("boot_instance", "0");
243                 break;
244         case BOOT_FLASH_NOR:
245                 env_set("boot_device", "nor");
246                 env_set("boot_instance", "0");
247                 break;
248         default:
249                 env_set("boot_device", "invalid");
250                 env_set("boot_instance", "");
251                 log_err("unexpected boot mode = %x\n", boot_mode);
252                 break;
253         }
254
255         switch (forced_mode) {
256         case BOOT_FASTBOOT:
257                 log_info("Enter fastboot!\n");
258                 env_set("preboot", "env set preboot; fastboot 0");
259                 break;
260         case BOOT_STM32PROG:
261                 env_set("boot_device", "usb");
262                 env_set("boot_instance", "0");
263                 break;
264         case BOOT_UMS_MMC0:
265         case BOOT_UMS_MMC1:
266         case BOOT_UMS_MMC2:
267                 log_info("Enter UMS!\n");
268                 instance = forced_mode - BOOT_UMS_MMC0;
269                 sprintf(cmd, "env set preboot; ums 0 mmc %d", instance);
270                 env_set("preboot", cmd);
271                 break;
272         case BOOT_RECOVERY:
273                 env_set("preboot", "env set preboot; run altbootcmd");
274                 break;
275         case BOOT_NORMAL:
276                 break;
277         default:
278                 log_debug("unexpected forced boot mode = %x\n", forced_mode);
279                 break;
280         }
281
282         /* clear TAMP for next reboot */
283         clrsetbits_le32(TAMP_BOOT_CONTEXT, TAMP_BOOT_FORCED_MASK, BOOT_NORMAL);
284 }
285
286 /*
287  * If there is no MAC address in the environment, then it will be initialized
288  * (silently) from the value in the OTP.
289  */
290 __weak int setup_mac_address(void)
291 {
292         int ret;
293         int i;
294         u32 otp[3];
295         uchar enetaddr[6];
296         struct udevice *dev;
297         int nb_eth, nb_otp, index;
298
299         if (!IS_ENABLED(CONFIG_NET))
300                 return 0;
301
302         nb_eth = get_eth_nb();
303
304         /* 6 bytes for each MAC addr and 4 bytes for each OTP */
305         nb_otp = DIV_ROUND_UP(6 * nb_eth, 4);
306
307         ret = uclass_get_device_by_driver(UCLASS_MISC,
308                                           DM_DRIVER_GET(stm32mp_bsec),
309                                           &dev);
310         if (ret)
311                 return ret;
312
313         ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_MAC), otp, 4 * nb_otp);
314         if (ret < 0)
315                 return ret;
316
317         for (index = 0; index < nb_eth; index++) {
318                 /* MAC already in environment */
319                 if (eth_env_get_enetaddr_by_index("eth", index, enetaddr))
320                         continue;
321
322                 for (i = 0; i < 6; i++)
323                         enetaddr[i] = ((uint8_t *)&otp)[i + 6 * index];
324
325                 if (!is_valid_ethaddr(enetaddr)) {
326                         log_err("invalid MAC address %d in OTP %pM\n",
327                                 index, enetaddr);
328                         return -EINVAL;
329                 }
330                 log_debug("OTP MAC address %d = %pM\n", index, enetaddr);
331                 ret = eth_env_set_enetaddr_by_index("eth", index, enetaddr);
332                 if (ret) {
333                         log_err("Failed to set mac address %pM from OTP: %d\n",
334                                 enetaddr, ret);
335                         return ret;
336                 }
337         }
338
339         return 0;
340 }
341
342 static int setup_serial_number(void)
343 {
344         char serial_string[25];
345         u32 otp[3] = {0, 0, 0 };
346         struct udevice *dev;
347         int ret;
348
349         if (env_get("serial#"))
350                 return 0;
351
352         ret = uclass_get_device_by_driver(UCLASS_MISC,
353                                           DM_DRIVER_GET(stm32mp_bsec),
354                                           &dev);
355         if (ret)
356                 return ret;
357
358         ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_SERIAL),
359                         otp, sizeof(otp));
360         if (ret < 0)
361                 return ret;
362
363         sprintf(serial_string, "%08X%08X%08X", otp[0], otp[1], otp[2]);
364         env_set("serial#", serial_string);
365
366         return 0;
367 }
368
369 __weak void stm32mp_misc_init(void)
370 {
371 }
372
373 int arch_misc_init(void)
374 {
375         setup_boot_mode();
376         setup_mac_address();
377         setup_serial_number();
378         stm32mp_misc_init();
379
380         return 0;
381 }
382
383 /*
384  * Without forcing the ".data" section, this would get saved in ".bss". BSS
385  * will be cleared soon after, so it's not suitable.
386  */
387 static uintptr_t rom_api_table __section(".data");
388 static uintptr_t nt_fw_dtb __section(".data");
389
390 /*
391  * The ROM gives us the API location in r0 when starting. This is only available
392  * during SPL, as there isn't (yet) a mechanism to pass this on to u-boot. Save
393  * the FDT address provided by TF-A in r2 at boot time. This function is called
394  * from start.S
395  */
396 void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
397                       unsigned long r3)
398 {
399         if (IS_ENABLED(CONFIG_STM32_ECDSA_VERIFY))
400                 rom_api_table = r0;
401
402         if (IS_ENABLED(CONFIG_TFABOOT))
403                 nt_fw_dtb = r2;
404
405         save_boot_params_ret();
406 }
407
408 uintptr_t get_stm32mp_rom_api_table(void)
409 {
410         return rom_api_table;
411 }
412
413 uintptr_t get_stm32mp_bl2_dtb(void)
414 {
415         return nt_fw_dtb;
416 }
417
418 #ifdef CONFIG_SPL_BUILD
419 void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
420 {
421         typedef void __noreturn (*image_entry_stm32_t)(u32 romapi);
422         uintptr_t romapi = get_stm32mp_rom_api_table();
423
424         image_entry_stm32_t image_entry =
425                 (image_entry_stm32_t)spl_image->entry_point;
426
427         printf("image entry point: 0x%lx\n", spl_image->entry_point);
428         image_entry(romapi);
429 }
430 #endif
This page took 0.05431 seconds and 4 git commands to generate.