From: Peng Fan peng.fan@nxp.com
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 --- arch/arm/cpu/armv7/mx6/soc.c | 38 ++++++++++++++++++++++++++++++++ arch/arm/include/asm/arch-mx6/imx-regs.h | 5 +++++ 2 files changed, 43 insertions(+)
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index bf5ae8c..ab0ccb0 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -491,3 +491,41 @@ void imx_setup_hdmi(void) writel(reg, &mxc_ccm->chsccdr); } #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 diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h index b1de751..f5ce31c 100644 --- a/arch/arm/include/asm/arch-mx6/imx-regs.h +++ b/arch/arm/include/asm/arch-mx6/imx-regs.h @@ -438,6 +438,11 @@ struct src { 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 */ #define IOMUXC_GPR1_APP_CLK_REQ_N BIT(30) #define IOMUXC_GPR1_PCIE_EXIT_L1 BIT(28)