prom.c (2231B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * 4 * Copyright (C) 2010 John Crispin <john@phrozen.org> 5 */ 6 7#include <linux/export.h> 8#include <linux/clk.h> 9#include <linux/memblock.h> 10#include <linux/of_fdt.h> 11 12#include <asm/bootinfo.h> 13#include <asm/time.h> 14#include <asm/prom.h> 15 16#include <lantiq.h> 17 18#include "prom.h" 19#include "clk.h" 20 21/* access to the ebu needs to be locked between different drivers */ 22DEFINE_SPINLOCK(ebu_lock); 23EXPORT_SYMBOL_GPL(ebu_lock); 24 25/* 26 * This is needed by the VPE loader code, just set it to 0 and assume 27 * that the firmware hardcodes this value to something useful. 28 */ 29unsigned long physical_memsize = 0L; 30 31/* 32 * this struct is filled by the soc specific detection code and holds 33 * information about the specific soc type, revision and name 34 */ 35static struct ltq_soc_info soc_info; 36 37const char *get_system_type(void) 38{ 39 return soc_info.sys_type; 40} 41 42int ltq_soc_type(void) 43{ 44 return soc_info.type; 45} 46 47static void __init prom_init_cmdline(void) 48{ 49 int argc = fw_arg0; 50 char **argv = (char **) KSEG1ADDR(fw_arg1); 51 int i; 52 53 arcs_cmdline[0] = '\0'; 54 55 for (i = 0; i < argc; i++) { 56 char *p = (char *) KSEG1ADDR(argv[i]); 57 58 if (CPHYSADDR(p) && *p) { 59 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline)); 60 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline)); 61 } 62 } 63} 64 65void __init plat_mem_setup(void) 66{ 67 void *dtb; 68 69 ioport_resource.start = IOPORT_RESOURCE_START; 70 ioport_resource.end = IOPORT_RESOURCE_END; 71 iomem_resource.start = IOMEM_RESOURCE_START; 72 iomem_resource.end = IOMEM_RESOURCE_END; 73 74 set_io_port_base((unsigned long) KSEG1); 75 76 dtb = get_fdt(); 77 if (dtb == NULL) 78 panic("no dtb found"); 79 80 /* 81 * Load the devicetree. This causes the chosen node to be 82 * parsed resulting in our memory appearing 83 */ 84 __dt_setup_arch(dtb); 85} 86 87void __init prom_init(void) 88{ 89 /* call the soc specific detetcion code and get it to fill soc_info */ 90 ltq_soc_detect(&soc_info); 91 snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s", 92 soc_info.name, soc_info.rev_type); 93 soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0'; 94 pr_info("SoC: %s\n", soc_info.sys_type); 95 prom_init_cmdline(); 96 97#if defined(CONFIG_MIPS_MT_SMP) 98 if (register_vsmp_smp_ops()) 99 panic("failed to register_vsmp_smp_ops()"); 100#endif 101}