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 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/machines.h>
30 #include <asm/srmmu.h>
31 #include <asm/processor.h>
39 extern struct linux_romvec *kernel_arg_promvec;
41 #define PROM_PGT __attribute__ ((__section__ (".prom.pgt")))
42 #define PROM_TEXT __attribute__ ((__section__ (".prom.text")))
43 #define PROM_DATA __attribute__ ((__section__ (".prom.data")))
46 extern int __prom_start;
47 #define PAGE_OFFSET 0xf0000000
48 #define phys_base CFG_SDRAM_BASE
49 #define PROM_OFFS 8192
50 #define PROM_SIZE_MASK (PROM_OFFS-1)
52 (void *)( ((unsigned long)(x))-PROM_OFFS+ \
53 (CFG_PROM_OFFSET-phys_base)+PAGE_OFFSET-TEXT_BASE ) \
55 #define __phy(x) ((void *)(((unsigned long)(x))-PROM_OFFS+CFG_PROM_OFFSET-TEXT_BASE))
65 struct property *properties;
68 static void leon_reboot(char *bcommand);
69 static void leon_halt(void);
70 static int leon_nbputchar(int c);
71 static int leon_nbgetchar(void);
73 static int no_nextnode(int node);
74 static int no_child(int node);
75 static int no_proplen(int node, char *name);
76 static int no_getprop(int node, char *name, char *value);
77 static int no_setprop(int node, char *name, char *value, int len);
78 static char *no_nextprop(int node, char *name);
80 static struct property PROM_TEXT *find_property(int node, char *name);
81 static int PROM_TEXT leon_strcmp(const char *s1, const char *s2);
82 static void *PROM_TEXT leon_memcpy(void *dest, const void *src, size_t n);
83 static void PROM_TEXT leon_reboot_physical(char *bcommand);
85 void __inline__ leon_flush_cache_all(void)
87 __asm__ __volatile__(" flush ");
88 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"::"i"(ASI_DFLUSH):"memory");
91 void __inline__ leon_flush_tlb_all(void)
93 leon_flush_cache_all();
94 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(0x400),
95 "i"(ASI_MMUFLUSH):"memory");
99 unsigned int ctx_table[256];
100 unsigned int pgd_table[256];
103 sparc_srmmu_setup srmmu_tables PROM_PGT = {
345 0x400001e /* default */
349 /* a self contained prom info structure */
350 struct leon_reloc_func {
351 struct property *(*find_property) (int node, char *name);
352 int (*strcmp) (char *s1, char *s2);
353 void *(*memcpy) (void *dest, const void *src, size_t n);
354 void (*reboot_physical) (char *cmd);
357 struct leon_prom_info {
362 struct leon_reloc_func reloc_funcs;
363 struct property root_properties[4];
364 struct property cpu_properties[7];
366 #define CPUENTRY(idx) struct property cpu_properties##idx[4]
398 struct idprom idprom;
399 struct linux_nodeops nodeops;
400 struct linux_mlist_v0 *totphys_p;
401 struct linux_mlist_v0 totphys;
402 struct linux_mlist_v0 *avail_p;
403 struct linux_mlist_v0 avail;
404 struct linux_mlist_v0 *prommap_p;
405 void (*synchook) (void);
406 struct linux_arguments_v0 *bootargs_p;
407 struct linux_arguments_v0 bootargs;
408 struct linux_romvec romvec;
409 struct node nodes[35];
410 char s_device_type[12];
414 char s_compatability[14];
417 char s_frequency[16];
418 char s_uart1_baud[11];
419 char s_uart2_baud[11];
423 /* static prom info */
424 static struct leon_prom_info PROM_DATA spi = {
425 CONFIG_SYS_CLK_FREQ / 1000,
429 #define CPUENTRY(idx) idx
467 __phy(leon_reboot_physical),
470 {__va(spi.s_device_type), __va(spi.s_idprom), 4},
471 {__va(spi.s_idprom), (char *)__va(&spi.idprom), sizeof(struct idprom)},
472 {__va(spi.s_compatability), __va(spi.s_leon2), 5},
476 {__va(spi.s_device_type), __va(spi.s_cpu), 4},
477 {__va(spi.s_mid), __va(&spi.mids[0]), 4},
478 {__va(spi.s_mmu_nctx), (char *)__va(&spi.leon_nctx), 4},
479 {__va(spi.s_frequency), (char *)__va(&spi.freq_khz), 4},
480 {__va(spi.s_uart1_baud), (char *)__va(&spi.baudrates[0]), 4},
481 {__va(spi.s_uart2_baud), (char *)__va(&spi.baudrates[1]), 4},
485 #define CPUENTRY(idx) \
486 { /* cpu_properties */ \
487 {__va(spi.s_device_type), __va(spi.s_cpu), 4}, \
488 {__va(spi.s_mid), __va(&spi.mids[idx]), 4}, \
489 {__va(spi.s_frequency), (char *)__va(&spi.freq_khz), 4}, \
525 M_LEON2 | M_LEON2_SOC, /* machine type */
526 {0, 0, 0, 0, 0, 0}, /* eth */
530 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* reserved */
543 (char *)CFG_SDRAM_BASE,
549 (char *)CFG_SDRAM_BASE,
552 NULL, /* prommap_p */
556 {NULL, __va(spi.arg), NULL /*... */ },
561 0, /* sun4c v0 prom */
563 {__va(&spi.totphys_p), __va(&spi.prommap_p), __va(&spi.avail_p)},
565 NULL, {NULL /* ... */ },
567 NULL, NULL, /* pv_getchar, pv_putchar */
568 __va(leon_nbgetchar), __va(leon_nbputchar),
577 __va(&spi.bootargs_p)
581 {0, __va(spi.root_properties + 3) /* NULL, NULL, -1 */ },
582 {0, __va(spi.root_properties)},
583 /* cpu 0, must be spi.nodes[2] see leon_prom_init() */
584 {1, __va(spi.cpu_properties)},
587 #define CPUENTRY(idx) \
588 {1, __va(spi.cpu_properties##idx) } /* cpu <idx> */
620 {-1, __va(spi.root_properties + 3) /* NULL, NULL, -1 */ }
632 CONFIG_DEFAULT_KERNEL_COMMAND_LINE
635 /* from arch/sparc/kernel/setup.c */
636 #define RAMDISK_LOAD_FLAG 0x4000
637 extern unsigned short root_flags;
638 extern unsigned short root_dev;
639 extern unsigned short ram_flags;
640 extern unsigned int sparc_ramdisk_image;
641 extern unsigned int sparc_ramdisk_size;
642 extern int root_mountflags;
644 extern char initrd_end, initrd_start;
646 /* Reboot the CPU = jump to beginning of flash again.
648 * Make sure that all function are inlined here.
650 static void PROM_TEXT leon_reboot(char *bcommand)
652 register char *arg = bcommand;
653 void __attribute__ ((noreturn)) (*reboot_physical) (char *cmd);
655 /* get physical address */
656 struct leon_prom_info *pspi =
657 (void *)(CFG_PROM_OFFSET + sizeof(srmmu_tables));
659 unsigned int *srmmu_ctx_table;
661 /* Turn of Interrupts */
664 /* Set kernel's context, context zero */
665 srmmu_set_context(0);
667 /* Get physical address of the MMU shutdown routine */
668 reboot_physical = (void *)
669 SPARC_BYPASS_READ(&pspi->reloc_funcs.reboot_physical);
671 /* Now that we know the physical address of the function
672 * we can make the MMU allow jumping to it.
674 srmmu_ctx_table = (unsigned int *)srmmu_get_ctable_ptr();
676 srmmu_ctx_table = (unsigned int *)SPARC_BYPASS_READ(srmmu_ctx_table);
678 /* get physical address of kernel's context table (assume ptd) */
679 srmmu_ctx_table = (unsigned int *)
680 (((unsigned int)srmmu_ctx_table & 0xfffffffc) << 4);
682 /* enable access to physical address of MMU shutdown function */
683 SPARC_BYPASS_WRITE(&srmmu_ctx_table
684 [((unsigned int)reboot_physical) >> 24],
685 (((unsigned int)reboot_physical & 0xff000000) >> 4) |
688 /* flush TLB cache */
689 leon_flush_tlb_all();
691 /* flash instruction & data cache */
692 sparc_icache_flush_all();
693 sparc_dcache_flush_all();
695 /* jump to physical address function
696 * so that when the MMU is disabled
697 * we can continue to execute
699 reboot_physical(arg);
702 static void PROM_TEXT leon_reboot_physical(char *bcommand)
704 void __attribute__ ((noreturn)) (*reset) (void);
709 /* Hardcoded start address */
710 reset = CFG_MONITOR_BASE;
712 /* flush data cache */
713 sparc_dcache_flush_all();
715 /* flush instruction cache */
716 sparc_icache_flush_all();
718 /* Jump to start in Flash */
722 static void PROM_TEXT leon_halt(void)
727 /* get single char, don't care for blocking*/
728 static int PROM_TEXT leon_nbgetchar(void)
733 /* put single char, don't care for blocking*/
734 static int PROM_TEXT leon_nbputchar(int c)
736 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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(&leon2->UART_Status_1)
744 & LEON2_UART_STAT_THE)) ;
747 SPARC_BYPASS_WRITE(&leon2->UART_Channel_1, c);
749 /* Wait for data to be sent */
750 while (!(SPARC_BYPASS_READ(&leon2->UART_Status_1)
751 & LEON2_UART_STAT_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 *)(CFG_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 (CFG_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 (CFG_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 (CFG_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 (CFG_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 (CFG_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 = CFG_PROM_OFFSET - CFG_SDRAM_BASE;
910 pspi->avail.num_bytes = pspi->totphys.num_bytes;
913 pspi->nodes[3].level = -1;
914 pspi->nodes[3].properties = __va(spi.root_properties + 3);
916 /* Set Ethernet MAC address from environment */
917 if ((addr_str = getenv("ethaddr")) != NULL) {
918 for (i = 0; i < 6; i++) {
919 pspi->idprom.id_ethaddr[i] = addr_str ?
920 simple_strtoul(addr_str, &end, 16) : 0;
922 addr_str = (*end) ? end + 1 : end;
926 /* HW Address not found in environment,
927 * Set default HW address
929 pspi->idprom.id_ethaddr[0] = 0;
930 pspi->idprom.id_ethaddr[1] = 0;
931 pspi->idprom.id_ethaddr[2] = 0;
932 pspi->idprom.id_ethaddr[3] = 0;
933 pspi->idprom.id_ethaddr[4] = 0;
934 pspi->idprom.id_ethaddr[5] = 0;
937 ptr = (unsigned char *)&pspi->idprom;
938 for (i = cksum = 0; i <= 0x0E; i++)
940 pspi->idprom.id_cksum = cksum;
943 static inline void set_cache(unsigned long regval)
945 asm volatile ("sta %0, [%%g0] %1\n\t":: "r" (regval), "i"(2):"memory");
948 extern unsigned short bss_start, bss_end;
950 /* mark as section .img.main.text, to be referenced in linker script */
953 struct leon_prom_info *pspi = (void *)
954 ((((unsigned int)&spi) & PROM_SIZE_MASK) + CFG_PROM_OFFSET);
957 srmmu_set_mmureg(0x00000000);
958 __asm__ __volatile__("flush\n\t");
960 /* init prom info struct */
961 leon_prom_init(pspi);
963 kernel_arg_promvec = &pspi->romvec;
965 printf("Kernel rom vec: 0x%lx\n", (unsigned int)(&pspi->romvec));
970 /* Copy current kernel boot argument to ROMvec */
971 void prepare_bootargs(char *bootargs)
973 struct leon_prom_info *pspi;
977 /* if no bootargs set, skip copying ==> default bootline */
978 if (bootargs && (*bootargs != '\0')) {
979 pspi = (void *)((((unsigned int)&spi) & PROM_SIZE_MASK) +
983 left = 255; /* max len */
984 while (*src && left > 0) {
988 /* terminate kernel command line string */
993 void srmmu_init_cpu(unsigned int entry)
995 sparc_srmmu_setup *psrmmu_tables = (void *)
996 ((((unsigned int)&srmmu_tables) & PROM_SIZE_MASK) +
999 /* Make context 0 (kernel's context) point
1000 * to our prepared memory mapping
1003 psrmmu_tables->ctx_table[0] =
1004 ((unsigned int)&psrmmu_tables->pgd_table[0x00]) >> 4 | PTD;
1006 /* Set virtual kernel address 0xf0000000
1007 * to SRAM/SDRAM address.
1008 * Make it READ/WRITE/EXEC to SuperUser
1011 #define ACC_SU_ALL 0x1c
1012 psrmmu_tables->pgd_table[0xf0] =
1013 (CFG_SDRAM_BASE >> 4) | ACC_SU_ALL | PTE;
1014 psrmmu_tables->pgd_table[0xf1] =
1015 ((CFG_SDRAM_BASE + 0x1000000) >> 4) | ACC_SU_ALL | PTE;
1016 psrmmu_tables->pgd_table[0xf2] =
1017 ((CFG_SDRAM_BASE + 0x2000000) >> 4) | ACC_SU_ALL | PTE;
1018 psrmmu_tables->pgd_table[0xf3] =
1019 ((CFG_SDRAM_BASE + 0x3000000) >> 4) | ACC_SU_ALL | PTE;
1020 psrmmu_tables->pgd_table[0xf4] =
1021 ((CFG_SDRAM_BASE + 0x4000000) >> 4) | ACC_SU_ALL | PTE;
1022 psrmmu_tables->pgd_table[0xf5] =
1023 ((CFG_SDRAM_BASE + 0x5000000) >> 4) | ACC_SU_ALL | PTE;
1024 psrmmu_tables->pgd_table[0xf6] =
1025 ((CFG_SDRAM_BASE + 0x6000000) >> 4) | ACC_SU_ALL | PTE;
1026 psrmmu_tables->pgd_table[0xf7] =
1027 ((CFG_SDRAM_BASE + 0x7000000) >> 4) | ACC_SU_ALL | PTE;
1029 /* convert rom vec pointer to virtual address */
1030 kernel_arg_promvec = (struct linux_romvec *)
1031 (((unsigned int)kernel_arg_promvec & 0x0fffffff) | 0xf0000000);
1033 /* Set Context pointer to point to context table
1034 * 256 contexts supported.
1036 srmmu_set_ctable_ptr((unsigned int)&psrmmu_tables->ctx_table[0]);
1038 /* Set kernel's context, context zero */
1039 srmmu_set_context(0);
1041 /* Invalidate all Cache */
1042 __asm__ __volatile__("flush\n\t");
1044 srmmu_set_mmureg(0x00000001);
1045 leon_flush_tlb_all();
1046 leon_flush_cache_all();