1 /* prom.c - emulates a sparc v0 PROM for the linux kernel.
3 * Copyright (C) 2003 Konrad Eisele <eiselekd@web.de>
4 * Copyright (C) 2004 Stefan Holst <mail@s-holst.de>
5 * Copyright (C) 2007 Daniel Hellstrom <daniel@gaisler.com>
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/machines.h>
13 #include <asm/srmmu.h>
14 #include <asm/processor.h>
23 extern struct linux_romvec *kernel_arg_promvec;
25 DECLARE_GLOBAL_DATA_PTR;
27 #define PROM_PGT __attribute__ ((__section__ (".prom.pgt")))
28 #define PROM_TEXT __attribute__ ((__section__ (".prom.text")))
29 #define PROM_DATA __attribute__ ((__section__ (".prom.data")))
31 ambapp_dev_gptimer *gptimer;
34 extern int __prom_start;
35 #define PAGE_OFFSET 0xf0000000
36 #define phys_base CONFIG_SYS_SDRAM_BASE
37 #define PROM_OFFS 8192
38 #define PROM_SIZE_MASK (PROM_OFFS-1)
40 (void *)( ((unsigned long)(x))-PROM_OFFS+ \
41 (CONFIG_SYS_PROM_OFFSET-phys_base)+PAGE_OFFSET-CONFIG_SYS_TEXT_BASE ) \
43 #define __phy(x) ((void *)(((unsigned long)(x))-PROM_OFFS+CONFIG_SYS_PROM_OFFSET-CONFIG_SYS_TEXT_BASE))
53 struct property *properties;
56 static void leon_reboot(char *bcommand);
57 static void leon_halt(void);
58 static int leon_nbputchar(int c);
59 static int leon_nbgetchar(void);
61 static int no_nextnode(int node);
62 static int no_child(int node);
63 static int no_proplen(int node, char *name);
64 static int no_getprop(int node, char *name, char *value);
65 static int no_setprop(int node, char *name, char *value, int len);
66 static char *no_nextprop(int node, char *name);
68 static struct property PROM_TEXT *find_property(int node, char *name);
69 static int PROM_TEXT leon_strcmp(const char *s1, const char *s2);
70 static void *PROM_TEXT leon_memcpy(void *dest, const void *src, size_t n);
71 static void PROM_TEXT leon_reboot_physical(char *bcommand);
73 void __inline__ leon_flush_cache_all(void)
75 __asm__ __volatile__(" flush ");
76 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"::"i"(ASI_DFLUSH):"memory");
79 void __inline__ leon_flush_tlb_all(void)
81 leon_flush_cache_all();
82 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(0x400),
83 "i"(ASI_MMUFLUSH):"memory");
87 unsigned int ctx_table[256];
88 unsigned int pgd_table[256];
91 sparc_srmmu_setup srmmu_tables PROM_PGT = {
333 0x400001e /* default */
337 /* a self contained prom info structure */
338 struct leon_reloc_func {
339 struct property *(*find_property) (int node, char *name);
340 int (*strcmp) (char *s1, char *s2);
341 void *(*memcpy) (void *dest, const void *src, size_t n);
342 void (*reboot_physical) (char *cmd);
343 ambapp_dev_apbuart *leon3_apbuart;
346 struct leon_prom_info {
351 struct leon_reloc_func reloc_funcs;
352 struct property root_properties[4];
353 struct property cpu_properties[7];
355 #define CPUENTRY(idx) struct property cpu_properties##idx[4]
387 struct idprom idprom;
388 struct linux_nodeops nodeops;
389 struct linux_mlist_v0 *totphys_p;
390 struct linux_mlist_v0 totphys;
391 struct linux_mlist_v0 *avail_p;
392 struct linux_mlist_v0 avail;
393 struct linux_mlist_v0 *prommap_p;
394 void (*synchook) (void);
395 struct linux_arguments_v0 *bootargs_p;
396 struct linux_arguments_v0 bootargs;
397 struct linux_romvec romvec;
398 struct node nodes[35];
399 char s_device_type[12];
403 char s_compatability[14];
406 char s_frequency[16];
407 char s_uart1_baud[11];
408 char s_uart2_baud[11];
412 /* static prom info */
413 static struct leon_prom_info PROM_DATA spi = {
414 CONFIG_SYS_CLK_FREQ / 1000,
418 #define CPUENTRY(idx) idx
456 __phy(leon_reboot_physical),
459 {__va(spi.s_device_type), __va(spi.s_idprom), 4},
460 {__va(spi.s_idprom), (char *)__va(&spi.idprom), sizeof(struct idprom)},
461 {__va(spi.s_compatability), __va(spi.s_leon2), 5},
465 {__va(spi.s_device_type), __va(spi.s_cpu), 4},
466 {__va(spi.s_mid), __va(&spi.mids[0]), 4},
467 {__va(spi.s_mmu_nctx), (char *)__va(&spi.leon_nctx), 4},
468 {__va(spi.s_frequency), (char *)__va(&spi.freq_khz), 4},
469 {__va(spi.s_uart1_baud), (char *)__va(&spi.baudrates[0]), 4},
470 {__va(spi.s_uart2_baud), (char *)__va(&spi.baudrates[1]), 4},
474 #define CPUENTRY(idx) \
475 { /* cpu_properties */ \
476 {__va(spi.s_device_type), __va(spi.s_cpu), 4}, \
477 {__va(spi.s_mid), __va(&spi.mids[idx]), 4}, \
478 {__va(spi.s_frequency), (char *)__va(&spi.freq_khz), 4}, \
514 M_LEON2 | M_LEON2_SOC, /* machine type */
515 {0, 0, 0, 0, 0, 0}, /* eth */
519 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* reserved */
532 (char *)CONFIG_SYS_SDRAM_BASE,
538 (char *)CONFIG_SYS_SDRAM_BASE,
541 NULL, /* prommap_p */
545 {NULL, __va(spi.arg), NULL /*... */ },
550 0, /* sun4c v0 prom */
552 {__va(&spi.totphys_p), __va(&spi.prommap_p), __va(&spi.avail_p)},
554 NULL, {NULL /* ... */ },
556 NULL, NULL, /* pv_getchar, pv_putchar */
557 __va(leon_nbgetchar), __va(leon_nbputchar),
566 __va(&spi.bootargs_p)
570 {0, __va(spi.root_properties + 3) /* NULL, NULL, -1 */ },
571 {0, __va(spi.root_properties)},
572 /* cpu 0, must be spi.nodes[2] see leon_prom_init() */
573 {1, __va(spi.cpu_properties)},
576 #define CPUENTRY(idx) \
577 {1, __va(spi.cpu_properties##idx) } /* cpu <idx> */
609 {-1, __va(spi.root_properties + 3) /* NULL, NULL, -1 */ }
621 CONFIG_DEFAULT_KERNEL_COMMAND_LINE
624 /* from arch/sparc/kernel/setup.c */
625 #define RAMDISK_LOAD_FLAG 0x4000
626 extern unsigned short root_flags;
627 extern unsigned short root_dev;
628 extern unsigned short ram_flags;
629 extern unsigned int sparc_ramdisk_image;
630 extern unsigned int sparc_ramdisk_size;
631 extern int root_mountflags;
633 extern char initrd_end, initrd_start;
635 /* Reboot the CPU = jump to beginning of flash again.
637 * Make sure that all function are inlined here.
639 static void PROM_TEXT leon_reboot(char *bcommand)
641 register char *arg = bcommand;
642 void __attribute__ ((noreturn)) (*reboot_physical) (char *cmd);
644 /* get physical address */
645 struct leon_prom_info *pspi =
646 (void *)(CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
648 unsigned int *srmmu_ctx_table;
650 /* Turn of Interrupts */
653 /* Set kernel's context, context zero */
654 srmmu_set_context(0);
656 /* Get physical address of the MMU shutdown routine */
657 reboot_physical = (void *)
658 SPARC_BYPASS_READ(&pspi->reloc_funcs.reboot_physical);
660 /* Now that we know the physical address of the function
661 * we can make the MMU allow jumping to it.
663 srmmu_ctx_table = (unsigned int *)srmmu_get_ctable_ptr();
665 srmmu_ctx_table = (unsigned int *)SPARC_BYPASS_READ(srmmu_ctx_table);
667 /* get physical address of kernel's context table (assume ptd) */
668 srmmu_ctx_table = (unsigned int *)
669 (((unsigned int)srmmu_ctx_table & 0xfffffffc) << 4);
671 /* enable access to physical address of MMU shutdown function */
672 SPARC_BYPASS_WRITE(&srmmu_ctx_table
673 [((unsigned int)reboot_physical) >> 24],
674 (((unsigned int)reboot_physical & 0xff000000) >> 4) |
677 /* flush TLB cache */
678 leon_flush_tlb_all();
680 /* flash instruction & data cache */
681 sparc_icache_flush_all();
682 sparc_dcache_flush_all();
684 /* jump to physical address function
685 * so that when the MMU is disabled
686 * we can continue to execute
688 reboot_physical(arg);
691 static void PROM_TEXT leon_reboot_physical(char *bcommand)
693 void __attribute__ ((noreturn)) (*reset) (void);
698 /* Hardcoded start address */
699 reset = CONFIG_SYS_MONITOR_BASE;
701 /* flush data cache */
702 sparc_dcache_flush_all();
704 /* flush instruction cache */
705 sparc_icache_flush_all();
707 /* Jump to start in Flash */
711 static void PROM_TEXT leon_halt(void)
716 /* get single char, don't care for blocking*/
717 static int PROM_TEXT leon_nbgetchar(void)
722 /* put single char, don't care for blocking*/
723 static int PROM_TEXT leon_nbputchar(int c)
725 ambapp_dev_apbuart *uart;
727 /* get physical address */
728 struct leon_prom_info *pspi =
729 (void *)(CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
731 uart = (ambapp_dev_apbuart *)
732 SPARC_BYPASS_READ(&pspi->reloc_funcs.leon3_apbuart);
738 /***** put char in buffer... ***********
739 * Make sure all functions are inline! *
740 ***************************************/
742 /* Wait for last character to go. */
743 while (!(SPARC_BYPASS_READ(&uart->status)
744 & LEON_REG_UART_STATUS_THE)) ;
747 SPARC_BYPASS_WRITE(&uart->data, c);
749 /* Wait for data to be sent */
750 while (!(SPARC_BYPASS_READ(&uart->status)
751 & LEON_REG_UART_STATUS_TSE)) ;
758 /*#define nodes ((struct node *)__va(&pspi->nodes))*/
759 #define nodes ((struct node *)(pspi->nodes))
761 static int PROM_TEXT no_nextnode(int node)
763 /* get physical address */
764 struct leon_prom_info *pspi =
765 (void *)(CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
767 /* convert into virtual address */
768 pspi = (struct leon_prom_info *)
769 (((unsigned int)pspi & 0x0fffffff) | PAGE_OFFSET);
771 if (nodes[node].level == nodes[node + 1].level)
776 static int PROM_TEXT no_child(int node)
778 /* get physical address */
779 struct leon_prom_info *pspi = (struct leon_prom_info *)
780 (CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
782 /* convert into virtual address */
783 pspi = (struct leon_prom_info *)
784 (((unsigned int)pspi & 0x0fffffff) | PAGE_OFFSET);
786 if (nodes[node].level == nodes[node + 1].level - 1)
791 static struct property PROM_TEXT *find_property(int node, char *name)
793 /* get physical address */
794 struct leon_prom_info *pspi = (struct leon_prom_info *)
795 (CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
797 /* convert into virtual address */
798 pspi = (struct leon_prom_info *)
799 (((unsigned int)pspi & 0x0fffffff) | PAGE_OFFSET);
801 struct property *prop = &nodes[node].properties[0];
802 while (prop && prop->name) {
803 if (pspi->reloc_funcs.strcmp(prop->name, name) == 0)
810 static int PROM_TEXT no_proplen(int node, char *name)
812 /* get physical address */
813 struct leon_prom_info *pspi = (struct leon_prom_info *)
814 (CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
816 /* convert into virtual address */
817 pspi = (struct leon_prom_info *)
818 (((unsigned int)pspi & 0x0fffffff) | PAGE_OFFSET);
820 struct property *prop = pspi->reloc_funcs.find_property(node, name);
826 static int PROM_TEXT no_getprop(int node, char *name, char *value)
828 /* get physical address */
829 struct leon_prom_info *pspi = (struct leon_prom_info *)
830 (CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
832 /* convert into virtual address */
833 pspi = (struct leon_prom_info *)
834 (((unsigned int)pspi & 0x0fffffff) | PAGE_OFFSET);
836 struct property *prop = pspi->reloc_funcs.find_property(node, name);
838 pspi->reloc_funcs.memcpy(value, prop->value, prop->length);
844 static int PROM_TEXT no_setprop(int node, char *name, char *value, int len)
849 static char PROM_TEXT *no_nextprop(int node, char *name)
851 /* get physical address */
852 struct leon_prom_info *pspi = (struct leon_prom_info *)
853 (CONFIG_SYS_PROM_OFFSET + sizeof(srmmu_tables));
854 struct property *prop;
856 /* convert into virtual address */
857 pspi = (struct leon_prom_info *)
858 (((unsigned int)pspi & 0x0fffffff) | PAGE_OFFSET);
860 if (!name || !name[0])
861 return nodes[node].properties[0].name;
863 prop = pspi->reloc_funcs.find_property(node, name);
869 static int PROM_TEXT leon_strcmp(const char *s1, const char *s2)
871 register char result;
884 static void *PROM_TEXT leon_memcpy(void *dest, const void *src, size_t n)
886 char *dst = (char *)dest, *source = (char *)src;
896 #define GETREGSP(sp) __asm__ __volatile__("mov %%sp, %0" : "=r" (sp))
898 void leon_prom_init(struct leon_prom_info *pspi)
901 unsigned char cksum, *ptr;
902 char *addr_str, *end;
906 pspi->freq_khz = CONFIG_SYS_CLK_FREQ / 1000;
908 /* Set Available main memory size */
909 pspi->totphys.num_bytes = CONFIG_SYS_PROM_OFFSET - CONFIG_SYS_SDRAM_BASE;
910 pspi->avail.num_bytes = pspi->totphys.num_bytes;
912 /* Set the pointer to the Console UART in romvec */
913 pspi->reloc_funcs.leon3_apbuart = gd->arch.uart;
919 b = (ambapp_dev_irqmp *) leon3_getapbbase(VENDOR_GAISLER,
922 j = 1 + ((LEON3_BYPASS_LOAD_PA(&(b->mpstatus))
923 >> LEON3_IRQMPSTATUS_CPUNR) & 0xf);
927 pspi->nodes[2 + j].level = -1;
928 pspi->nodes[2 + j].properties = __va(spi.root_properties + 3);
931 /* Set Ethernet MAC address from environment */
932 if ((addr_str = getenv("ethaddr")) != NULL) {
933 for (i = 0; i < 6; i++) {
934 pspi->idprom.id_ethaddr[i] = addr_str ?
935 simple_strtoul(addr_str, &end, 16) : 0;
937 addr_str = (*end) ? end + 1 : end;
941 /* HW Address not found in environment,
942 * Set default HW address
944 pspi->idprom.id_ethaddr[0] = 0;
945 pspi->idprom.id_ethaddr[1] = 0;
946 pspi->idprom.id_ethaddr[2] = 0;
947 pspi->idprom.id_ethaddr[3] = 0;
948 pspi->idprom.id_ethaddr[4] = 0;
949 pspi->idprom.id_ethaddr[5] = 0;
952 ptr = (unsigned char *)&pspi->idprom;
953 for (i = cksum = 0; i <= 0x0E; i++)
955 pspi->idprom.id_cksum = cksum;
958 static inline void set_cache(unsigned long regval)
960 asm volatile ("sta %0, [%%g0] %1\n\t":: "r" (regval), "i"(2):"memory");
963 extern unsigned short bss_start, bss_end;
965 /* mark as section .img.main.text, to be referenced in linker script */
968 struct leon_prom_info *pspi = (void *)
969 ((((unsigned int)&spi) & PROM_SIZE_MASK) + CONFIG_SYS_PROM_OFFSET);
972 srmmu_set_mmureg(0x00000000);
973 __asm__ __volatile__("flush\n\t");
975 /* init prom info struct */
976 leon_prom_init(pspi);
978 kernel_arg_promvec = &pspi->romvec;
980 printf("Kernel rom vec: 0x%lx\n", (unsigned int)(&pspi->romvec));
985 /* Copy current kernel boot argument to ROMvec */
986 void prepare_bootargs(char *bootargs)
988 struct leon_prom_info *pspi;
992 /* if no bootargs set, skip copying ==> default bootline */
993 if (bootargs && (*bootargs != '\0')) {
994 pspi = (void *)((((unsigned int)&spi) & PROM_SIZE_MASK) +
995 CONFIG_SYS_PROM_OFFSET);
998 left = 255; /* max len */
999 while (*src && left > 0) {
1003 /* terminate kernel command line string */
1008 void srmmu_init_cpu(unsigned int entry)
1010 sparc_srmmu_setup *psrmmu_tables = (void *)
1011 ((((unsigned int)&srmmu_tables) & PROM_SIZE_MASK) +
1012 CONFIG_SYS_PROM_OFFSET);
1014 /* Make context 0 (kernel's context) point
1015 * to our prepared memory mapping
1018 psrmmu_tables->ctx_table[0] =
1019 ((unsigned int)&psrmmu_tables->pgd_table[0x00]) >> 4 | PTD;
1021 /* Set virtual kernel address 0xf0000000
1022 * to SRAM/SDRAM address.
1023 * Make it READ/WRITE/EXEC to SuperUser
1026 #define ACC_SU_ALL 0x1c
1027 psrmmu_tables->pgd_table[0xf0] =
1028 (CONFIG_SYS_SDRAM_BASE >> 4) | ACC_SU_ALL | PTE;
1029 psrmmu_tables->pgd_table[0xf1] =
1030 ((CONFIG_SYS_SDRAM_BASE + 0x1000000) >> 4) | ACC_SU_ALL | PTE;
1031 psrmmu_tables->pgd_table[0xf2] =
1032 ((CONFIG_SYS_SDRAM_BASE + 0x2000000) >> 4) | ACC_SU_ALL | PTE;
1033 psrmmu_tables->pgd_table[0xf3] =
1034 ((CONFIG_SYS_SDRAM_BASE + 0x3000000) >> 4) | ACC_SU_ALL | PTE;
1035 psrmmu_tables->pgd_table[0xf4] =
1036 ((CONFIG_SYS_SDRAM_BASE + 0x4000000) >> 4) | ACC_SU_ALL | PTE;
1037 psrmmu_tables->pgd_table[0xf5] =
1038 ((CONFIG_SYS_SDRAM_BASE + 0x5000000) >> 4) | ACC_SU_ALL | PTE;
1039 psrmmu_tables->pgd_table[0xf6] =
1040 ((CONFIG_SYS_SDRAM_BASE + 0x6000000) >> 4) | ACC_SU_ALL | PTE;
1041 psrmmu_tables->pgd_table[0xf7] =
1042 ((CONFIG_SYS_SDRAM_BASE + 0x7000000) >> 4) | ACC_SU_ALL | PTE;
1044 /* convert rom vec pointer to virtual address */
1045 kernel_arg_promvec = (struct linux_romvec *)
1046 (((unsigned int)kernel_arg_promvec & 0x0fffffff) | 0xf0000000);
1048 /* Set Context pointer to point to context table
1049 * 256 contexts supported.
1051 srmmu_set_ctable_ptr((unsigned int)&psrmmu_tables->ctx_table[0]);
1053 /* Set kernel's context, context zero */
1054 srmmu_set_context(0);
1056 /* Invalidate all Cache */
1057 __asm__ __volatile__("flush\n\t");
1059 srmmu_set_mmureg(0x00000001);
1060 leon_flush_tlb_all();
1061 leon_flush_cache_all();