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imx: mx6: implement functions to boot auxiliary core

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Implement arch_auxiliary_core_up and arch_auxiliary_core_check_up.

arch_auxiliary_core_check_up is used to check whether M4 is running
or not. arch_auxiliary_core_up is to boot M4 core, the m4 core will
use the pc and stack which is set in arch_auxiliary_core_up to set R15
and R13 register and boot.

Signed-off-by: Ye.Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Peng Fan 2016-01-28 16:55:05 +08:00 • committed by Stefano Babic
parent 6f6058bfd8
commit 0623d375cf
2 changed files with 43 additions and 0 deletions
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38
arch/arm/cpu/armv7/mx6/soc.c
View file

@ -567,3 +567,41 @@ void imx_setup_hdmi(void)
writel(reg, &mxc_ccm->chsccdr); writel(reg, &mxc_ccm->chsccdr);
} }
#endif #endif
#ifdef CONFIG_IMX_BOOTAUX
int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
{
struct src *src_reg;
u32 stack, pc;
if (!boot_private_data)
return -EINVAL;
stack = *(u32 *)boot_private_data;
pc = *(u32 *)(boot_private_data + 4);
/* Set the stack and pc to M4 bootROM */
writel(stack, M4_BOOTROM_BASE_ADDR);
writel(pc, M4_BOOTROM_BASE_ADDR + 4);
/* Enable M4 */
src_reg = (struct src *)SRC_BASE_ADDR;
clrsetbits_le32(&src_reg->scr, SRC_SCR_M4C_NON_SCLR_RST_MASK,
SRC_SCR_M4_ENABLE_MASK);
return 0;
}
int arch_auxiliary_core_check_up(u32 core_id)
{
struct src *src_reg = (struct src *)SRC_BASE_ADDR;
unsigned val;
val = readl(&src_reg->scr);
if (val & SRC_SCR_M4C_NON_SCLR_RST_MASK)
return 0; /* assert in reset */
return 1;
}
#endif

5
arch/arm/include/asm/arch-mx6/imx-regs.h
View file

@ -438,6 +438,11 @@ struct src {
u32 gpr10; u32 gpr10;
}; };
#define SRC_SCR_M4_ENABLE_OFFSET 22
#define SRC_SCR_M4_ENABLE_MASK (1 << 22)
#define SRC_SCR_M4C_NON_SCLR_RST_OFFSET 4
#define SRC_SCR_M4C_NON_SCLR_RST_MASK (1 << 4)
/* GPR1 bitfields */ /* GPR1 bitfields */
#define IOMUXC_GPR1_APP_CLK_REQ_N BIT(30) #define IOMUXC_GPR1_APP_CLK_REQ_N BIT(30)
#define IOMUXC_GPR1_PCIE_EXIT_L1 BIT(28) #define IOMUXC_GPR1_PCIE_EXIT_L1 BIT(28)