mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 03:06:16 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
97 lines
2.2 KiB
C
97 lines
2.2 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 <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 <imx_sip.h>
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#include <linux/compiler.h>
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int arch_auxiliary_core_up(u32 core_id, ulong boot_private_data)
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{
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ulong stack, pc;
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if (!boot_private_data)
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return -EINVAL;
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stack = *(ulong *)boot_private_data;
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pc = *(ulong *)(boot_private_data + 4);
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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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/* Enable M4 */
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#ifdef CONFIG_MX8M
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call_imx_sip(IMX_SIP_SRC, IMX_SIP_SRC_M4_START, 0, 0);
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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_MX8M
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return call_imx_sip(IMX_SIP_SRC, IMX_SIP_SRC_M4_STARTED, 0, 0);
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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(cmd_tbl_t *cmdtp, int flag, int argc, 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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printf("## Starting auxiliary core at 0x%08lX ...\n", addr);
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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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