mirror of
https://github.com/AsahiLinux/u-boot
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35b65dd8ef
Historically, the reset_cpu() function had an `addr` parameter which was
meant to pass in an address of the reset vector location, where the CPU
should reset to. This feature is no longer used anywhere in U-Boot as
all reset_cpu() implementations now ignore the passed value. Generic
code has been added which always calls reset_cpu() with `0` which means
this feature can no longer be used easily anyway.
Over time, many implementations seem to have "misunderstood" the
existence of this parameter as a way to customize/parameterize the reset
(e.g. COLD vs WARM resets). As this is not properly supported, the
code will almost always not do what it is intended to (because all
call-sites just call reset_cpu() with 0).
To avoid confusion and to clean up the codebase from unused left-overs
of the past, remove the `addr` parameter entirely. Code which intends
to support different kinds of resets should be rewritten as a sysreset
driver instead.
This transformation was done with the following coccinelle patch:
@@
expression argvalue;
@@
- reset_cpu(argvalue)
+ reset_cpu()
@@
identifier argname;
type argtype;
@@
- reset_cpu(argtype argname)
+ reset_cpu(void)
{ ... }
Signed-off-by: Harald Seiler <hws@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Cisco Systems, Inc.
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* (C) Copyright 2019 Synamedia
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*
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* Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
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*/
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#include <cpu_func.h>
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#include <init.h>
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#include <log.h>
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#include <time.h>
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#include <asm/global_data.h>
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#include <linux/types.h>
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#include <common.h>
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#include <env.h>
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#include <asm/io.h>
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#include <asm/bootm.h>
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#include <mach/timer.h>
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#include <mmc.h>
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#include <fdtdec.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define BCMSTB_DATA_SECTION __attribute__((section(".data")))
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struct bcmstb_boot_parameters bcmstb_boot_parameters BCMSTB_DATA_SECTION;
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phys_addr_t prior_stage_fdt_address BCMSTB_DATA_SECTION;
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union reg_value_union {
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const char *data;
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const phys_addr_t *address;
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};
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int board_init(void)
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{
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return 0;
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}
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u32 get_board_rev(void)
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{
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return 0;
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}
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void reset_cpu(void)
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{
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}
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int print_cpuinfo(void)
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{
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return 0;
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}
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int dram_init(void)
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{
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if (fdtdec_setup_mem_size_base() != 0)
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return -EINVAL;
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return 0;
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}
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int dram_init_banksize(void)
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{
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fdtdec_setup_memory_banksize();
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/*
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* On this SoC, U-Boot is running as an ELF file. Change the
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* relocation address to CONFIG_SYS_TEXT_BASE, so that in
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* setup_reloc, gd->reloc_off works out to 0, effectively
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* disabling relocation. Otherwise U-Boot hangs in the setup
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* instructions just before relocate_code in
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* arch/arm/lib/crt0.S.
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*/
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gd->relocaddr = CONFIG_SYS_TEXT_BASE;
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return 0;
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}
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void enable_caches(void)
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{
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/*
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* This port assumes that the prior stage bootloader has
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* enabled I-cache and D-cache already. Implementing this
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* function silences the warning in the default function.
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*/
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}
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int timer_init(void)
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{
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gd->arch.timer_rate_hz = readl(BCMSTB_TIMER_FREQUENCY);
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return 0;
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}
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ulong get_tbclk(void)
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{
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return gd->arch.timer_rate_hz;
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}
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uint64_t get_ticks(void)
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{
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gd->timebase_h = readl(BCMSTB_TIMER_HIGH);
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gd->timebase_l = readl(BCMSTB_TIMER_LOW);
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return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
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}
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int board_late_init(void)
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{
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debug("Arguments from prior stage bootloader:\n");
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debug("General Purpose Register 0: 0x%x\n", bcmstb_boot_parameters.r0);
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debug("General Purpose Register 1: 0x%x\n", bcmstb_boot_parameters.r1);
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debug("General Purpose Register 2: 0x%x\n", bcmstb_boot_parameters.r2);
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debug("General Purpose Register 3: 0x%x\n", bcmstb_boot_parameters.r3);
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debug("Stack Pointer Register: 0x%x\n", bcmstb_boot_parameters.sp);
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debug("Link Register: 0x%x\n", bcmstb_boot_parameters.lr);
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debug("Assuming timer frequency register at: 0x%p\n",
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(void *)BCMSTB_TIMER_FREQUENCY);
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debug("Read timer frequency (in Hz): %ld\n", gd->arch.timer_rate_hz);
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debug("Prior stage provided DTB at: 0x%p\n",
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(void *)prior_stage_fdt_address);
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/*
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* Set fdtcontroladdr in the environment so that scripts can
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* refer to it, for example, to reuse it for fdtaddr.
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*/
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env_set_hex("fdtcontroladdr", prior_stage_fdt_address);
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/*
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* Do not set machid to the machine identifier value provided
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* by the prior stage bootloader (bcmstb_boot_parameters.r1)
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* because we're using a device tree to boot Linux.
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*/
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return 0;
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}
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