imx: mx6: implement functions to boot auxiliary core

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>

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index db6eabf..a34675c 100644 (file)
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -567,3 +567,41 @@ 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 4cff8ee..f3c26dc 100644 (file)
--- 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)