imx: mx7: 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>

arch/arm/cpu/armv7/mx7/soc.c

@@ -211,6 +211,42 @@ void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
 }
 #endif
 
+#ifdef CONFIG_IMX_BOOTAUX
+int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
+{
+	u32 stack, pc;
+	struct src *src_reg = (struct src *)SRC_BASE_ADDR;
+
+	if (!boot_private_data)
+		return 1;
+
+	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 */
+	clrsetbits_le32(&src_reg->m4rcr, SRC_M4RCR_M4C_NON_SCLR_RST_MASK,
+			SRC_M4RCR_ENABLE_M4_MASK);
+
+	return 0;
+}
+
+int arch_auxiliary_core_check_up(u32 core_id)
+{
+	uint32_t val;
+	struct src *src_reg = (struct src *)SRC_BASE_ADDR;
+
+	val = readl(&src_reg->m4rcr);
+	if (val & 0x00000001)
+		return 0; /* assert in reset */
+
+	return 1;
+}
+#endif
+
 void set_wdog_reset(struct wdog_regs *wdog)
 {
 	u32 reg = readw(&wdog->wcr);

arch/arm/include/asm/arch-mx7/imx-regs.h

@@ -263,6 +263,11 @@ struct src {
 	u32 ddrc_rcr;
 };
 
+#define SRC_M4RCR_M4C_NON_SCLR_RST_OFFSET	0
+#define SRC_M4RCR_M4C_NON_SCLR_RST_MASK		(1 << 0)
+#define SRC_M4RCR_ENABLE_M4_OFFSET		3
+#define SRC_M4RCR_ENABLE_M4_MASK		(1 << 3)
+
 /* GPR0 Bit Fields */
 #define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL0_MASK     0x1u
 #define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL0_SHIFT    0