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MIPS: Loongson64: Load built-in dtbs 

Load proper dtb according to firmware passed parameters and
CPU PRID.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Co-developed-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Jiaxun Yang 2020-03-25 11:55:03 +08:00 committed by Thomas Bogendoerfer
parent 87fcfa7b7f
commit fcecdcd388
4 changed files with 53 additions and 0 deletions
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13
arch/mips/include/asm/mach-loongson64/builtin_dtbs.h Normal file
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@ -0,0 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019 Jiaxun Yang <jiaxun.yang@flygoat.com>
*
* Built-in Generic dtbs for MACH_LOONGSON64
*/
#ifndef __ASM_MACH_LOONGSON64_BUILTIN_DTBS_H_
#define __ASM_MACH_LOONGSON64_BUILTIN_DTBS_H_
extern u32 __dtb_loongson3_4core_rs780e_begin[];
extern u32 __dtb_loongson3_8core_rs780e_begin[];
#endif

1
arch/mips/include/asm/mach-loongson64/loongson.h
View File

@ -25,6 +25,7 @@ extern const struct plat_smp_ops loongson3_smp_ops;
/* loongson-specific command line, env and memory initialization */
extern void __init prom_init_memory(void);
extern void __init prom_init_env(void);
extern void *loongson_fdt_blob;
/* irq operation functions */
extern void mach_irq_dispatch(unsigned int pending);

23
arch/mips/loongson64/env.c
View File

@ -17,6 +17,7 @@
#include <asm/bootinfo.h>
#include <loongson.h>
#include <boot_param.h>
#include <builtin_dtbs.h>
#include <workarounds.h>
u32 cpu_clock_freq;
@ -120,6 +121,28 @@ void __init prom_init_env(void)
loongson_sysconf.cores_per_node - 1) /
loongson_sysconf.cores_per_node;
if ((read_c0_prid() & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64C) {
switch (read_c0_prid() & PRID_REV_MASK) {
case PRID_REV_LOONGSON3A_R1:
case PRID_REV_LOONGSON3A_R2_0:
case PRID_REV_LOONGSON3A_R2_1:
case PRID_REV_LOONGSON3A_R3_0:
case PRID_REV_LOONGSON3A_R3_1:
loongson_fdt_blob = __dtb_loongson3_4core_rs780e_begin;
break;
case PRID_REV_LOONGSON3B_R1:
case PRID_REV_LOONGSON3B_R2:
loongson_fdt_blob = __dtb_loongson3_8core_rs780e_begin;
break;
default:
break;
}
}
if (!loongson_fdt_blob)
pr_err("Failed to determine built-in Loongson64 dtb\n");
loongson_sysconf.pci_mem_start_addr = eirq_source->pci_mem_start_addr;
loongson_sysconf.pci_mem_end_addr = eirq_source->pci_mem_end_addr;
loongson_sysconf.pci_io_base = eirq_source->pci_io_start_addr;

16
arch/mips/loongson64/setup.c
View File

@ -8,9 +8,15 @@
#include <asm/wbflush.h>
#include <asm/bootinfo.h>
#include <linux/libfdt.h>
#include <linux/of_fdt.h>
#include <asm/prom.h>
#include <loongson.h>
void *loongson_fdt_blob;
static void wbflush_loongson(void)
{
asm(".set\tpush\n\t"
@ -27,4 +33,14 @@ EXPORT_SYMBOL(__wbflush);
void __init plat_mem_setup(void)
{
if (loongson_fdt_blob)
__dt_setup_arch(loongson_fdt_blob);
}
void __init device_tree_init(void)
{
if (!initial_boot_params)
return;
unflatten_and_copy_device_tree();
}