mirror of
https://github.com/AsahiLinux/u-boot
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134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/io.h>
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#include <asm/mach-imx/sys_proto.h>
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#include <command.h>
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#include <elf.h>
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#include <imx_sip.h>
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#include <linux/arm-smccc.h>
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#include <linux/compiler.h>
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#include <cpu_func.h>
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int arch_auxiliary_core_up(u32 core_id, ulong addr)
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{
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ulong stack, pc;
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if (!addr)
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return -EINVAL;
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#ifdef CONFIG_IMX8M
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stack = *(u32 *)addr;
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pc = *(u32 *)(addr + 4);
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#else
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/*
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* handling ELF64 binaries
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* isn't supported yet.
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*/
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if (valid_elf_image(addr)) {
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stack = 0x0;
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pc = load_elf_image_phdr(addr);
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if (!pc)
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return CMD_RET_FAILURE;
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} else {
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/*
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* Assume binary file with vector table at the beginning.
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* Cortex-M4 vector tables start with the stack pointer (SP)
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* and reset vector (initial PC).
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*/
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stack = *(u32 *)addr;
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pc = *(u32 *)(addr + 4);
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}
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#endif
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printf("## Starting auxiliary core stack = 0x%08lX, pc = 0x%08lX...\n",
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stack, pc);
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/* Set the stack and pc to M4 bootROM */
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writel(stack, M4_BOOTROM_BASE_ADDR);
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writel(pc, M4_BOOTROM_BASE_ADDR + 4);
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flush_dcache_all();
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/* Enable M4 */
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#ifdef CONFIG_IMX8M
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arm_smccc_smc(IMX_SIP_SRC, IMX_SIP_SRC_M4_START, 0, 0,
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0, 0, 0, 0, NULL);
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#else
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clrsetbits_le32(SRC_BASE_ADDR + SRC_M4_REG_OFFSET,
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SRC_M4C_NON_SCLR_RST_MASK, SRC_M4_ENABLE_MASK);
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#endif
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return 0;
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}
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int arch_auxiliary_core_check_up(u32 core_id)
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{
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#ifdef CONFIG_IMX8M
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struct arm_smccc_res res;
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arm_smccc_smc(IMX_SIP_SRC, IMX_SIP_SRC_M4_STARTED, 0, 0,
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0, 0, 0, 0, &res);
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return res.a0;
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#else
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unsigned int val;
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val = readl(SRC_BASE_ADDR + SRC_M4_REG_OFFSET);
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if (val & SRC_M4C_NON_SCLR_RST_MASK)
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return 0; /* assert in reset */
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return 1;
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#endif
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}
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/*
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* To i.MX6SX and i.MX7D, the image supported by bootaux needs
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* the reset vector at the head for the image, with SP and PC
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* as the first two words.
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*
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* Per the cortex-M reference manual, the reset vector of M4 needs
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* to exist at 0x0 (TCMUL). The PC and SP are the first two addresses
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* of that vector. So to boot M4, the A core must build the M4's reset
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* vector with getting the PC and SP from image and filling them to
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* TCMUL. When M4 is kicked, it will load the PC and SP by itself.
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* The TCMUL is mapped to (M4_BOOTROM_BASE_ADDR) at A core side for
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* accessing the M4 TCMUL.
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*/
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static int do_bootaux(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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ulong addr;
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int ret, up;
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if (argc < 2)
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return CMD_RET_USAGE;
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up = arch_auxiliary_core_check_up(0);
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if (up) {
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printf("## Auxiliary core is already up\n");
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return CMD_RET_SUCCESS;
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}
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addr = simple_strtoul(argv[1], NULL, 16);
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if (!addr)
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return CMD_RET_FAILURE;
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ret = arch_auxiliary_core_up(0, addr);
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if (ret)
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return CMD_RET_FAILURE;
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(
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bootaux, CONFIG_SYS_MAXARGS, 1, do_bootaux,
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"Start auxiliary core",
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""
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);
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