LXR uboot/arch/nios2/cpu/cpu.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
   4 * Scott McNutt <smcnutt@psyent.com>
   5 */
   6
   7#include <common.h>
   8#include <cpu.h>
   9#include <dm.h>
  10#include <errno.h>
  11#include <asm/cache.h>
  12
  13DECLARE_GLOBAL_DATA_PTR;
  14
  15#ifdef CONFIG_DISPLAY_CPUINFO
  16int print_cpuinfo(void)
  17{
  18        printf("CPU:   Nios-II\n");
  19        return 0;
  20}
  21#endif /* CONFIG_DISPLAY_CPUINFO */
  22
  23#ifdef CONFIG_ALTERA_SYSID
  24int checkboard(void)
  25{
  26        display_sysid();
  27        return 0;
  28}
  29#endif
  30
  31int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  32{
  33        disable_interrupts();
  34        /* indirect call to go beyond 256MB limitation of toolchain */
  35        nios2_callr(gd->arch.reset_addr);
  36        return 0;
  37}
  38
  39/*
  40 * COPY EXCEPTION TRAMPOLINE -- copy the tramp to the
  41 * exception address. Define CONFIG_ROM_STUBS to prevent
  42 * the copy (e.g. exception in flash or in other
  43 * softare/firmware component).
  44 */
  45#ifndef CONFIG_ROM_STUBS
  46static void copy_exception_trampoline(void)
  47{
  48        extern int _except_start, _except_end;
  49        void *except_target = (void *)gd->arch.exception_addr;
  50
  51        if (&_except_start != except_target) {
  52                memcpy(except_target, &_except_start,
  53                       &_except_end - &_except_start);
  54                flush_cache(gd->arch.exception_addr,
  55                            &_except_end - &_except_start);
  56        }
  57}
  58#endif
  59
  60int arch_cpu_init_dm(void)
  61{
  62        struct udevice *dev;
  63        int ret;
  64
  65        ret = uclass_first_device_err(UCLASS_CPU, &dev);
  66        if (ret)
  67                return ret;
  68
  69        gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
  70#ifndef CONFIG_ROM_STUBS
  71        copy_exception_trampoline();
  72#endif
  73
  74        return 0;
  75}
  76
  77static int altera_nios2_get_desc(struct udevice *dev, char *buf, int size)
  78{
  79        const char *cpu_name = "Nios-II";
  80
  81        if (size < strlen(cpu_name))
  82                return -ENOSPC;
  83        strcpy(buf, cpu_name);
  84
  85        return 0;
  86}
  87
  88static int altera_nios2_get_info(struct udevice *dev, struct cpu_info *info)
  89{
  90        info->cpu_freq = gd->cpu_clk;
  91        info->features = (1 << CPU_FEAT_L1_CACHE) |
  92                (gd->arch.has_mmu ? (1 << CPU_FEAT_MMU) : 0);
  93
  94        return 0;
  95}
  96
  97static int altera_nios2_get_count(struct udevice *dev)
  98{
  99        return 1;
 100}
 101
 102static int altera_nios2_probe(struct udevice *dev)
 103{
 104        const void *blob = gd->fdt_blob;
 105        int node = dev_of_offset(dev);
 106
 107        gd->cpu_clk = fdtdec_get_int(blob, node,
 108                "clock-frequency", 0);
 109        gd->arch.dcache_line_size = fdtdec_get_int(blob, node,
 110                "dcache-line-size", 0);
 111        gd->arch.icache_line_size = fdtdec_get_int(blob, node,
 112                "icache-line-size", 0);
 113        gd->arch.dcache_size = fdtdec_get_int(blob, node,
 114                "dcache-size", 0);
 115        gd->arch.icache_size = fdtdec_get_int(blob, node,
 116                "icache-size", 0);
 117        gd->arch.reset_addr = fdtdec_get_int(blob, node,
 118                "altr,reset-addr", 0);
 119        gd->arch.exception_addr = fdtdec_get_int(blob, node,
 120                "altr,exception-addr", 0);
 121        gd->arch.has_initda = fdtdec_get_int(blob, node,
 122                "altr,has-initda", 0);
 123        gd->arch.has_mmu = fdtdec_get_int(blob, node,
 124                "altr,has-mmu", 0);
 125        gd->arch.io_region_base = gd->arch.has_mmu ? 0xe0000000 : 0x80000000;
 126        gd->arch.mem_region_base = gd->arch.has_mmu ? 0xc0000000 : 0x00000000;
 127        gd->arch.physaddr_mask = gd->arch.has_mmu ? 0x1fffffff : 0x7fffffff;
 128
 129        return 0;
 130}
 131
 132static const struct cpu_ops altera_nios2_ops = {
 133        .get_desc       = altera_nios2_get_desc,
 134        .get_info       = altera_nios2_get_info,
 135        .get_count      = altera_nios2_get_count,
 136};
 137
 138static const struct udevice_id altera_nios2_ids[] = {
 139        { .compatible = "altr,nios2-1.0" },
 140        { .compatible = "altr,nios2-1.1" },
 141        { }
 142};
 143
 144U_BOOT_DRIVER(altera_nios2) = {
 145        .name           = "altera_nios2",
 146        .id             = UCLASS_CPU,
 147        .of_match       = altera_nios2_ids,
 148        .probe          = altera_nios2_probe,
 149        .ops            = &altera_nios2_ops,
 150        .flags          = DM_FLAG_PRE_RELOC,
 151};
 152
 153/* This is a dummy function on nios2 */
 154int dram_init(void)
 155{
 156        return 0;
 157}
 158