MLK-12531 mx6sxsabresd: Add CM4 fast boot up demo

This is a demo that CM4 will boot up by u-boot without typing any
command. It boots up at u-boot early init, try to minimize the time
from power up to the CM4 running.
Since CM4 runs on QSPI NOR XIP, we have to disable the QSPI driver in
u-boot to avoid conflict.

RDC for shared GPIO1 is added, but not enabled, because the kernel is
not ready for shared GPIO1. Users can uncomment the CONFIG_IMX_RDC to
enable it.

Some legacy codes in mx6sxsabreauto are removed. We only need this work
on mx6sxsabresd as a demo.

Signed-off-by: Ye Li <ye.li@nxp.com>

arch/arm/include/asm/imx-common/sys_proto.h

@@ -60,4 +60,7 @@ void board_late_mmc_env_init(void);
 
 void vadc_power_up(void);
 void vadc_power_down(void);
+
+int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data);
+int arch_auxiliary_core_check_up(u32 core_id);
 #endif

board/freescale/mx6sxsabresd/mx6sxsabresd.c

@@ -32,6 +32,11 @@
 #include <usb/ehci-fsl.h>
 #include <asm/imx-common/video.h>
 
+#ifdef CONFIG_IMX_RDC
+#include <asm/imx-common/rdc-sema.h>
+#include <asm/arch/imx-rdc.h>
+#endif
+
 #ifdef CONFIG_FSL_FASTBOOT
 #include <fsl_fastboot.h>
 #ifdef CONFIG_ANDROID_RECOVERY
@@ -436,8 +441,22 @@ int board_phy_config(struct phy_device *phydev)
 	return 0;
 }
 
+#ifdef CONFIG_IMX_RDC
+static rdc_peri_cfg_t const shared_resources[] = {
+	(RDC_PER_GPIO1 | RDC_DOMAIN(0) | RDC_DOMAIN(1)),
+};
+#endif
+
 int board_early_init_f(void)
 {
+#ifdef CONFIG_IMX_RDC
+	imx_rdc_setup_peripherals(shared_resources, ARRAY_SIZE(shared_resources));
+#endif
+
+#ifdef CONFIG_SYS_AUXCORE_FASTUP
+	arch_auxiliary_core_up(0, CONFIG_SYS_AUXCORE_BOOTDATA);
+#endif
+
 	setup_iomux_uart();
 
 	return 0;

configs/mx6sxsabresd_m4fastup_defconfig

@@ -0,0 +1,5 @@
+CONFIG_ARM=y
+CONFIG_ARCH_MX6=y
+CONFIG_TARGET_MX6SXSABRESD=y
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6sxsabresd/imximage.cfg,SYS_BOOT_QSPI,SYS_AUXCORE_FASTUP"
+CONFIG_CMD_GPIO=y

include/configs/mx6sxsabreauto.h

@@ -40,9 +40,7 @@
 #endif
 
 #define CONFIG_SYS_AUXCORE_BOOTDATA 0x68000000 /* Set to QSPI1 B flash at default */
-#ifndef CONFIG_SYS_AUXCORE_FASTUP
-#define CONFIG_IMX_BOOTAUX /* Boot M4 by command, disable this when M4 fast up */
-#endif
+#define CONFIG_IMX_BOOTAUX
 
 #ifdef CONFIG_IMX_BOOTAUX
 #define UPDATE_M4_ENV \
@@ -190,10 +188,7 @@
 #define CONFIG_SYS_INIT_SP_ADDR \
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
 
-#ifdef CONFIG_SYS_AUXCORE_FASTUP
-/*#define CONFIG_IMX_RDC*/   /* Disable the RDC temporarily, will enable it in future */
-#define CONFIG_ENV_IS_IN_MMC  /* Must disable QSPI driver, because M4 run on QSPI */
-#elif defined CONFIG_SYS_BOOT_QSPI
+#if defined CONFIG_SYS_BOOT_QSPI
 #define CONFIG_ENV_IS_IN_SPI_FLASH
 #elif defined CONFIG_SYS_BOOT_NAND
 #define CONFIG_ENV_IS_IN_NAND

include/configs/mx6sxsabresd.h

@@ -41,13 +41,11 @@
 #define CONFIG_MXC_UART
 #define CONFIG_MXC_UART_BASE		UART1_BASE
 
-#define CONFIG_SYS_AUXCORE_BOOTDATA 0x78000000
-#ifndef CONFIG_SYS_AUXCORE_FASTUP
+#define CONFIG_SYS_AUXCORE_BOOTDATA 0x78000000 /* Set to QSPI2 B flash at default */
 #define CONFIG_IMX_BOOTAUX
-/* Set to QSPI2 B flash at default */
-#endif
 
-#ifdef CONFIG_IMX_BOOTAUX
+/* When using M4 fastup demo, no need these M4 env, since QSPI is used by M4 */
+#ifndef CONFIG_SYS_AUXCORE_FASTUP
 #define UPDATE_M4_ENV \
 	"m4image=m4_qspi.bin\0" \
 	"loadm4image=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${m4image}\0" \
@@ -177,7 +175,7 @@
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
 
 #ifdef CONFIG_SYS_AUXCORE_FASTUP
-/*#define CONFIG_IMX_RDC*/   /* Disable the RDC temporarily, will enable it in future */
+/* #define CONFIG_IMX_RDC */   /* Disable the RDC temporarily, will enable it in future */
 #define CONFIG_ENV_IS_IN_MMC  /* Must disable QSPI driver, because M4 run on QSPI */
 #elif defined CONFIG_SYS_BOOT_QSPI
 #define CONFIG_FSL_QSPI